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[PARISC] Remove GCC_VERSION usage as suggested by Adrian Bunk
[linux-2.6.22.y-op.git] / drivers / char / stallion.c
blob5e2de62bce706dd7b4f7843e5f608c98f1cb96a3
1 /*****************************************************************************/
2
3 /*
4 * stallion.c -- stallion multiport serial driver.
5 *
6 * Copyright (C) 1996-1999 Stallion Technologies
7 * Copyright (C) 1994-1996 Greg Ungerer.
8 *
9 * This code is loosely based on the Linux serial driver, written by
10 * Linus Torvalds, Theodore T'so and others.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26
27 /*****************************************************************************/
28
29 #include <linux/module.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial.h>
35 #include <linux/cd1400.h>
36 #include <linux/sc26198.h>
37 #include <linux/comstats.h>
38 #include <linux/stallion.h>
39 #include <linux/ioport.h>
40 #include <linux/init.h>
41 #include <linux/smp_lock.h>
42 #include <linux/device.h>
43 #include <linux/delay.h>
44
45 #include <asm/io.h>
46 #include <asm/uaccess.h>
47
48 #ifdef CONFIG_PCI
49 #include <linux/pci.h>
50 #endif
51
52 /*****************************************************************************/
53
54 /*
55 * Define different board types. Use the standard Stallion "assigned"
56 * board numbers. Boards supported in this driver are abbreviated as
57 * EIO = EasyIO and ECH = EasyConnection 8/32.
58 */
59 #define BRD_EASYIO 20
60 #define BRD_ECH 21
61 #define BRD_ECHMC 22
62 #define BRD_ECHPCI 26
63 #define BRD_ECH64PCI 27
64 #define BRD_EASYIOPCI 28
65
66 /*
67 * Define a configuration structure to hold the board configuration.
68 * Need to set this up in the code (for now) with the boards that are
69 * to be configured into the system. This is what needs to be modified
70 * when adding/removing/modifying boards. Each line entry in the
71 * stl_brdconf[] array is a board. Each line contains io/irq/memory
72 * ranges for that board (as well as what type of board it is).
73 * Some examples:
74 * { BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },
75 * This line would configure an EasyIO board (4 or 8, no difference),
76 * at io address 2a0 and irq 10.
77 * Another example:
78 * { BRD_ECH, 0x2a8, 0x280, 0, 12, 0 },
79 * This line will configure an EasyConnection 8/32 board at primary io
80 * address 2a8, secondary io address 280 and irq 12.
81 * Enter as many lines into this array as you want (only the first 4
82 * will actually be used!). Any combination of EasyIO and EasyConnection
83 * boards can be specified. EasyConnection 8/32 boards can share their
84 * secondary io addresses between each other.
85 *
86 * NOTE: there is no need to put any entries in this table for PCI
87 * boards. They will be found automatically by the driver - provided
88 * PCI BIOS32 support is compiled into the kernel.
89 */
90
91 typedef struct {
92 int brdtype;
93 int ioaddr1;
94 int ioaddr2;
95 unsigned long memaddr;
96 int irq;
97 int irqtype;
98 } stlconf_t;
99
100 static stlconf_t stl_brdconf[] = {
101 /*{ BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },*/
102 };
103
104 static int stl_nrbrds = ARRAY_SIZE(stl_brdconf);
105
106 /*****************************************************************************/
107
108 /*
109 * Define some important driver characteristics. Device major numbers
110 * allocated as per Linux Device Registry.
111 */
112 #ifndef STL_SIOMEMMAJOR
113 #define STL_SIOMEMMAJOR 28
114 #endif
115 #ifndef STL_SERIALMAJOR
116 #define STL_SERIALMAJOR 24
117 #endif
118 #ifndef STL_CALLOUTMAJOR
119 #define STL_CALLOUTMAJOR 25
120 #endif
121
122 /*
123 * Set the TX buffer size. Bigger is better, but we don't want
124 * to chew too much memory with buffers!
125 */
126 #define STL_TXBUFLOW 512
127 #define STL_TXBUFSIZE 4096
128
129 /*****************************************************************************/
130
131 /*
132 * Define our local driver identity first. Set up stuff to deal with
133 * all the local structures required by a serial tty driver.
134 */
135 static char *stl_drvtitle = "Stallion Multiport Serial Driver";
136 static char *stl_drvname = "stallion";
137 static char *stl_drvversion = "5.6.0";
138
139 static struct tty_driver *stl_serial;
140
141 /*
142 * Define a local default termios struct. All ports will be created
143 * with this termios initially. Basically all it defines is a raw port
144 * at 9600, 8 data bits, 1 stop bit.
145 */
146 static struct termios stl_deftermios = {
147 .c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
148 .c_cc = INIT_C_CC,
149 };
150
151 /*
152 * Define global stats structures. Not used often, and can be
153 * re-used for each stats call.
154 */
155 static comstats_t stl_comstats;
156 static combrd_t stl_brdstats;
157 static stlbrd_t stl_dummybrd;
158 static stlport_t stl_dummyport;
159
160 /*
161 * Define global place to put buffer overflow characters.
162 */
163 static char stl_unwanted[SC26198_RXFIFOSIZE];
164
165 /*****************************************************************************/
166
167 static stlbrd_t *stl_brds[STL_MAXBRDS];
168
169 /*
170 * Per board state flags. Used with the state field of the board struct.
171 * Not really much here!
172 */
173 #define BRD_FOUND 0x1
174
175 /*
176 * Define the port structure istate flags. These set of flags are
177 * modified at interrupt time - so setting and reseting them needs
178 * to be atomic. Use the bit clear/setting routines for this.
179 */
180 #define ASYI_TXBUSY 1
181 #define ASYI_TXLOW 2
182 #define ASYI_DCDCHANGE 3
183 #define ASYI_TXFLOWED 4
184
185 /*
186 * Define an array of board names as printable strings. Handy for
187 * referencing boards when printing trace and stuff.
188 */
189 static char *stl_brdnames[] = {
190 (char *) NULL,
191 (char *) NULL,
192 (char *) NULL,
193 (char *) NULL,
194 (char *) NULL,
195 (char *) NULL,
196 (char *) NULL,
197 (char *) NULL,
198 (char *) NULL,
199 (char *) NULL,
200 (char *) NULL,
201 (char *) NULL,
202 (char *) NULL,
203 (char *) NULL,
204 (char *) NULL,
205 (char *) NULL,
206 (char *) NULL,
207 (char *) NULL,
208 (char *) NULL,
209 (char *) NULL,
210 "EasyIO",
211 "EC8/32-AT",
212 "EC8/32-MC",
213 (char *) NULL,
214 (char *) NULL,
215 (char *) NULL,
216 "EC8/32-PCI",
217 "EC8/64-PCI",
218 "EasyIO-PCI",
219 };
220
221 /*****************************************************************************/
222
223 /*
224 * Define some string labels for arguments passed from the module
225 * load line. These allow for easy board definitions, and easy
226 * modification of the io, memory and irq resoucres.
227 */
228 static int stl_nargs = 0;
229 static char *board0[4];
230 static char *board1[4];
231 static char *board2[4];
232 static char *board3[4];
233
234 static char **stl_brdsp[] = {
235 (char **) &board0,
236 (char **) &board1,
237 (char **) &board2,
238 (char **) &board3
239 };
240
241 /*
242 * Define a set of common board names, and types. This is used to
243 * parse any module arguments.
244 */
245
246 typedef struct stlbrdtype {
247 char *name;
248 int type;
249 } stlbrdtype_t;
250
251 static stlbrdtype_t stl_brdstr[] = {
252 { "easyio", BRD_EASYIO },
253 { "eio", BRD_EASYIO },
254 { "20", BRD_EASYIO },
255 { "ec8/32", BRD_ECH },
256 { "ec8/32-at", BRD_ECH },
257 { "ec8/32-isa", BRD_ECH },
258 { "ech", BRD_ECH },
259 { "echat", BRD_ECH },
260 { "21", BRD_ECH },
261 { "ec8/32-mc", BRD_ECHMC },
262 { "ec8/32-mca", BRD_ECHMC },
263 { "echmc", BRD_ECHMC },
264 { "echmca", BRD_ECHMC },
265 { "22", BRD_ECHMC },
266 { "ec8/32-pc", BRD_ECHPCI },
267 { "ec8/32-pci", BRD_ECHPCI },
268 { "26", BRD_ECHPCI },
269 { "ec8/64-pc", BRD_ECH64PCI },
270 { "ec8/64-pci", BRD_ECH64PCI },
271 { "ech-pci", BRD_ECH64PCI },
272 { "echpci", BRD_ECH64PCI },
273 { "echpc", BRD_ECH64PCI },
274 { "27", BRD_ECH64PCI },
275 { "easyio-pc", BRD_EASYIOPCI },
276 { "easyio-pci", BRD_EASYIOPCI },
277 { "eio-pci", BRD_EASYIOPCI },
278 { "eiopci", BRD_EASYIOPCI },
279 { "28", BRD_EASYIOPCI },
280 };
281
282 /*
283 * Define the module agruments.
284 */
285 MODULE_AUTHOR("Greg Ungerer");
286 MODULE_DESCRIPTION("Stallion Multiport Serial Driver");
287 MODULE_LICENSE("GPL");
288
289 module_param_array(board0, charp, &stl_nargs, 0);
290 MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,ioaddr2][,irq]]");
291 module_param_array(board1, charp, &stl_nargs, 0);
292 MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,ioaddr2][,irq]]");
293 module_param_array(board2, charp, &stl_nargs, 0);
294 MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,ioaddr2][,irq]]");
295 module_param_array(board3, charp, &stl_nargs, 0);
296 MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,ioaddr2][,irq]]");
297
298 /*****************************************************************************/
299
300 /*
301 * Hardware ID bits for the EasyIO and ECH boards. These defines apply
302 * to the directly accessible io ports of these boards (not the uarts -
303 * they are in cd1400.h and sc26198.h).
304 */
305 #define EIO_8PORTRS 0x04
306 #define EIO_4PORTRS 0x05
307 #define EIO_8PORTDI 0x00
308 #define EIO_8PORTM 0x06
309 #define EIO_MK3 0x03
310 #define EIO_IDBITMASK 0x07
311
312 #define EIO_BRDMASK 0xf0
313 #define ID_BRD4 0x10
314 #define ID_BRD8 0x20
315 #define ID_BRD16 0x30
316
317 #define EIO_INTRPEND 0x08
318 #define EIO_INTEDGE 0x00
319 #define EIO_INTLEVEL 0x08
320 #define EIO_0WS 0x10
321
322 #define ECH_ID 0xa0
323 #define ECH_IDBITMASK 0xe0
324 #define ECH_BRDENABLE 0x08
325 #define ECH_BRDDISABLE 0x00
326 #define ECH_INTENABLE 0x01
327 #define ECH_INTDISABLE 0x00
328 #define ECH_INTLEVEL 0x02
329 #define ECH_INTEDGE 0x00
330 #define ECH_INTRPEND 0x01
331 #define ECH_BRDRESET 0x01
332
333 #define ECHMC_INTENABLE 0x01
334 #define ECHMC_BRDRESET 0x02
335
336 #define ECH_PNLSTATUS 2
337 #define ECH_PNL16PORT 0x20
338 #define ECH_PNLIDMASK 0x07
339 #define ECH_PNLXPID 0x40
340 #define ECH_PNLINTRPEND 0x80
341
342 #define ECH_ADDR2MASK 0x1e0
343
344 /*
345 * Define the vector mapping bits for the programmable interrupt board
346 * hardware. These bits encode the interrupt for the board to use - it
347 * is software selectable (except the EIO-8M).
348 */
349 static unsigned char stl_vecmap[] = {
350 0xff, 0xff, 0xff, 0x04, 0x06, 0x05, 0xff, 0x07,
351 0xff, 0xff, 0x00, 0x02, 0x01, 0xff, 0xff, 0x03
352 };
353
354 /*
355 * Lock ordering is that you may not take stallion_lock holding
356 * brd_lock.
357 */
358
359 static spinlock_t brd_lock; /* Guard the board mapping */
360 static spinlock_t stallion_lock; /* Guard the tty driver */
361
362 /*
363 * Set up enable and disable macros for the ECH boards. They require
364 * the secondary io address space to be activated and deactivated.
365 * This way all ECH boards can share their secondary io region.
366 * If this is an ECH-PCI board then also need to set the page pointer
367 * to point to the correct page.
368 */
369 #define BRDENABLE(brdnr,pagenr) \
370 if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
371 outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDENABLE), \
372 stl_brds[(brdnr)]->ioctrl); \
373 else if (stl_brds[(brdnr)]->brdtype == BRD_ECHPCI) \
374 outb((pagenr), stl_brds[(brdnr)]->ioctrl);
375
376 #define BRDDISABLE(brdnr) \
377 if (stl_brds[(brdnr)]->brdtype == BRD_ECH) \
378 outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDDISABLE), \
379 stl_brds[(brdnr)]->ioctrl);
380
381 #define STL_CD1400MAXBAUD 230400
382 #define STL_SC26198MAXBAUD 460800
383
384 #define STL_BAUDBASE 115200
385 #define STL_CLOSEDELAY (5 * HZ / 10)
386
387 /*****************************************************************************/
388
389 #ifdef CONFIG_PCI
390
391 /*
392 * Define the Stallion PCI vendor and device IDs.
393 */
394 #ifndef PCI_VENDOR_ID_STALLION
395 #define PCI_VENDOR_ID_STALLION 0x124d
396 #endif
397 #ifndef PCI_DEVICE_ID_ECHPCI832
398 #define PCI_DEVICE_ID_ECHPCI832 0x0000
399 #endif
400 #ifndef PCI_DEVICE_ID_ECHPCI864
401 #define PCI_DEVICE_ID_ECHPCI864 0x0002
402 #endif
403 #ifndef PCI_DEVICE_ID_EIOPCI
404 #define PCI_DEVICE_ID_EIOPCI 0x0003
405 #endif
406
407 /*
408 * Define structure to hold all Stallion PCI boards.
409 */
410 typedef struct stlpcibrd {
411 unsigned short vendid;
412 unsigned short devid;
413 int brdtype;
414 } stlpcibrd_t;
415
416 static stlpcibrd_t stl_pcibrds[] = {
417 { PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI864, BRD_ECH64PCI },
418 { PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_EIOPCI, BRD_EASYIOPCI },
419 { PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI832, BRD_ECHPCI },
420 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410, BRD_ECHPCI },
421 };
422
423 static int stl_nrpcibrds = ARRAY_SIZE(stl_pcibrds);
424
425 #endif
426
427 /*****************************************************************************/
428
429 /*
430 * Define macros to extract a brd/port number from a minor number.
431 */
432 #define MINOR2BRD(min) (((min) & 0xc0) >> 6)
433 #define MINOR2PORT(min) ((min) & 0x3f)
434
435 /*
436 * Define a baud rate table that converts termios baud rate selector
437 * into the actual baud rate value. All baud rate calculations are
438 * based on the actual baud rate required.
439 */
440 static unsigned int stl_baudrates[] = {
441 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
442 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
443 };
444
445 /*
446 * Define some handy local macros...
447 */
448 #undef MIN
449 #define MIN(a,b) (((a) <= (b)) ? (a) : (b))
450
451 #undef TOLOWER
452 #define TOLOWER(x) ((((x) >= 'A') && ((x) <= 'Z')) ? ((x) + 0x20) : (x))
453
454 /*****************************************************************************/
455
456 /*
457 * Declare all those functions in this driver!
458 */
459
460 static void stl_argbrds(void);
461 static int stl_parsebrd(stlconf_t *confp, char **argp);
462
463 static unsigned long stl_atol(char *str);
464
465 static int stl_init(void);
466 static int stl_open(struct tty_struct *tty, struct file *filp);
467 static void stl_close(struct tty_struct *tty, struct file *filp);
468 static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count);
469 static void stl_putchar(struct tty_struct *tty, unsigned char ch);
470 static void stl_flushchars(struct tty_struct *tty);
471 static int stl_writeroom(struct tty_struct *tty);
472 static int stl_charsinbuffer(struct tty_struct *tty);
473 static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
474 static void stl_settermios(struct tty_struct *tty, struct termios *old);
475 static void stl_throttle(struct tty_struct *tty);
476 static void stl_unthrottle(struct tty_struct *tty);
477 static void stl_stop(struct tty_struct *tty);
478 static void stl_start(struct tty_struct *tty);
479 static void stl_flushbuffer(struct tty_struct *tty);
480 static void stl_breakctl(struct tty_struct *tty, int state);
481 static void stl_waituntilsent(struct tty_struct *tty, int timeout);
482 static void stl_sendxchar(struct tty_struct *tty, char ch);
483 static void stl_hangup(struct tty_struct *tty);
484 static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
485 static int stl_portinfo(stlport_t *portp, int portnr, char *pos);
486 static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data);
487
488 static int stl_brdinit(stlbrd_t *brdp);
489 static int stl_initports(stlbrd_t *brdp, stlpanel_t *panelp);
490 static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp);
491 static int stl_setserial(stlport_t *portp, struct serial_struct __user *sp);
492 static int stl_getbrdstats(combrd_t __user *bp);
493 static int stl_getportstats(stlport_t *portp, comstats_t __user *cp);
494 static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp);
495 static int stl_getportstruct(stlport_t __user *arg);
496 static int stl_getbrdstruct(stlbrd_t __user *arg);
497 static int stl_waitcarrier(stlport_t *portp, struct file *filp);
498 static int stl_eiointr(stlbrd_t *brdp);
499 static int stl_echatintr(stlbrd_t *brdp);
500 static int stl_echmcaintr(stlbrd_t *brdp);
501 static int stl_echpciintr(stlbrd_t *brdp);
502 static int stl_echpci64intr(stlbrd_t *brdp);
503 static void stl_offintr(struct work_struct *);
504 static stlbrd_t *stl_allocbrd(void);
505 static stlport_t *stl_getport(int brdnr, int panelnr, int portnr);
506
507 static inline int stl_initbrds(void);
508 static inline int stl_initeio(stlbrd_t *brdp);
509 static inline int stl_initech(stlbrd_t *brdp);
510 static inline int stl_getbrdnr(void);
511
512 #ifdef CONFIG_PCI
513 static inline int stl_findpcibrds(void);
514 static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp);
515 #endif
516
517 /*
518 * CD1400 uart specific handling functions.
519 */
520 static void stl_cd1400setreg(stlport_t *portp, int regnr, int value);
521 static int stl_cd1400getreg(stlport_t *portp, int regnr);
522 static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value);
523 static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
524 static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
525 static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp);
526 static int stl_cd1400getsignals(stlport_t *portp);
527 static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts);
528 static void stl_cd1400ccrwait(stlport_t *portp);
529 static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx);
530 static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx);
531 static void stl_cd1400disableintrs(stlport_t *portp);
532 static void stl_cd1400sendbreak(stlport_t *portp, int len);
533 static void stl_cd1400flowctrl(stlport_t *portp, int state);
534 static void stl_cd1400sendflow(stlport_t *portp, int state);
535 static void stl_cd1400flush(stlport_t *portp);
536 static int stl_cd1400datastate(stlport_t *portp);
537 static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase);
538 static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase);
539 static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr);
540 static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr);
541 static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr);
542
543 static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr);
544
545 /*
546 * SC26198 uart specific handling functions.
547 */
548 static void stl_sc26198setreg(stlport_t *portp, int regnr, int value);
549 static int stl_sc26198getreg(stlport_t *portp, int regnr);
550 static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value);
551 static int stl_sc26198getglobreg(stlport_t *portp, int regnr);
552 static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
553 static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
554 static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp);
555 static int stl_sc26198getsignals(stlport_t *portp);
556 static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts);
557 static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx);
558 static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx);
559 static void stl_sc26198disableintrs(stlport_t *portp);
560 static void stl_sc26198sendbreak(stlport_t *portp, int len);
561 static void stl_sc26198flowctrl(stlport_t *portp, int state);
562 static void stl_sc26198sendflow(stlport_t *portp, int state);
563 static void stl_sc26198flush(stlport_t *portp);
564 static int stl_sc26198datastate(stlport_t *portp);
565 static void stl_sc26198wait(stlport_t *portp);
566 static void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty);
567 static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase);
568 static void stl_sc26198txisr(stlport_t *port);
569 static void stl_sc26198rxisr(stlport_t *port, unsigned int iack);
570 static void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch);
571 static void stl_sc26198rxbadchars(stlport_t *portp);
572 static void stl_sc26198otherisr(stlport_t *port, unsigned int iack);
573
574 /*****************************************************************************/
575
576 /*
577 * Generic UART support structure.
578 */
579 typedef struct uart {
580 int (*panelinit)(stlbrd_t *brdp, stlpanel_t *panelp);
581 void (*portinit)(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
582 void (*setport)(stlport_t *portp, struct termios *tiosp);
583 int (*getsignals)(stlport_t *portp);
584 void (*setsignals)(stlport_t *portp, int dtr, int rts);
585 void (*enablerxtx)(stlport_t *portp, int rx, int tx);
586 void (*startrxtx)(stlport_t *portp, int rx, int tx);
587 void (*disableintrs)(stlport_t *portp);
588 void (*sendbreak)(stlport_t *portp, int len);
589 void (*flowctrl)(stlport_t *portp, int state);
590 void (*sendflow)(stlport_t *portp, int state);
591 void (*flush)(stlport_t *portp);
592 int (*datastate)(stlport_t *portp);
593 void (*intr)(stlpanel_t *panelp, unsigned int iobase);
594 } uart_t;
595
596 /*
597 * Define some macros to make calling these functions nice and clean.
598 */
599 #define stl_panelinit (* ((uart_t *) panelp->uartp)->panelinit)
600 #define stl_portinit (* ((uart_t *) portp->uartp)->portinit)
601 #define stl_setport (* ((uart_t *) portp->uartp)->setport)
602 #define stl_getsignals (* ((uart_t *) portp->uartp)->getsignals)
603 #define stl_setsignals (* ((uart_t *) portp->uartp)->setsignals)
604 #define stl_enablerxtx (* ((uart_t *) portp->uartp)->enablerxtx)
605 #define stl_startrxtx (* ((uart_t *) portp->uartp)->startrxtx)
606 #define stl_disableintrs (* ((uart_t *) portp->uartp)->disableintrs)
607 #define stl_sendbreak (* ((uart_t *) portp->uartp)->sendbreak)
608 #define stl_flowctrl (* ((uart_t *) portp->uartp)->flowctrl)
609 #define stl_sendflow (* ((uart_t *) portp->uartp)->sendflow)
610 #define stl_flush (* ((uart_t *) portp->uartp)->flush)
611 #define stl_datastate (* ((uart_t *) portp->uartp)->datastate)
612
613 /*****************************************************************************/
614
615 /*
616 * CD1400 UART specific data initialization.
617 */
618 static uart_t stl_cd1400uart = {
619 stl_cd1400panelinit,
620 stl_cd1400portinit,
621 stl_cd1400setport,
622 stl_cd1400getsignals,
623 stl_cd1400setsignals,
624 stl_cd1400enablerxtx,
625 stl_cd1400startrxtx,
626 stl_cd1400disableintrs,
627 stl_cd1400sendbreak,
628 stl_cd1400flowctrl,
629 stl_cd1400sendflow,
630 stl_cd1400flush,
631 stl_cd1400datastate,
632 stl_cd1400eiointr
633 };
634
635 /*
636 * Define the offsets within the register bank of a cd1400 based panel.
637 * These io address offsets are common to the EasyIO board as well.
638 */
639 #define EREG_ADDR 0
640 #define EREG_DATA 4
641 #define EREG_RXACK 5
642 #define EREG_TXACK 6
643 #define EREG_MDACK 7
644
645 #define EREG_BANKSIZE 8
646
647 #define CD1400_CLK 25000000
648 #define CD1400_CLK8M 20000000
649
650 /*
651 * Define the cd1400 baud rate clocks. These are used when calculating
652 * what clock and divisor to use for the required baud rate. Also
653 * define the maximum baud rate allowed, and the default base baud.
654 */
655 static int stl_cd1400clkdivs[] = {
656 CD1400_CLK0, CD1400_CLK1, CD1400_CLK2, CD1400_CLK3, CD1400_CLK4
657 };
658
659 /*****************************************************************************/
660
661 /*
662 * SC26198 UART specific data initization.
663 */
664 static uart_t stl_sc26198uart = {
665 stl_sc26198panelinit,
666 stl_sc26198portinit,
667 stl_sc26198setport,
668 stl_sc26198getsignals,
669 stl_sc26198setsignals,
670 stl_sc26198enablerxtx,
671 stl_sc26198startrxtx,
672 stl_sc26198disableintrs,
673 stl_sc26198sendbreak,
674 stl_sc26198flowctrl,
675 stl_sc26198sendflow,
676 stl_sc26198flush,
677 stl_sc26198datastate,
678 stl_sc26198intr
679 };
680
681 /*
682 * Define the offsets within the register bank of a sc26198 based panel.
683 */
684 #define XP_DATA 0
685 #define XP_ADDR 1
686 #define XP_MODID 2
687 #define XP_STATUS 2
688 #define XP_IACK 3
689
690 #define XP_BANKSIZE 4
691
692 /*
693 * Define the sc26198 baud rate table. Offsets within the table
694 * represent the actual baud rate selector of sc26198 registers.
695 */
696 static unsigned int sc26198_baudtable[] = {
697 50, 75, 150, 200, 300, 450, 600, 900, 1200, 1800, 2400, 3600,
698 4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200,
699 230400, 460800, 921600
700 };
701
702 #define SC26198_NRBAUDS ARRAY_SIZE(sc26198_baudtable)
703
704 /*****************************************************************************/
705
706 /*
707 * Define the driver info for a user level control device. Used mainly
708 * to get at port stats - only not using the port device itself.
709 */
710 static const struct file_operations stl_fsiomem = {
711 .owner = THIS_MODULE,
712 .ioctl = stl_memioctl,
713 };
714
715 /*****************************************************************************/
716
717 static struct class *stallion_class;
718
719 /*
720 * Loadable module initialization stuff.
721 */
722
723 static int __init stallion_module_init(void)
724 {
725 stl_init();
726 return 0;
727 }
728
729 /*****************************************************************************/
730
731 static void __exit stallion_module_exit(void)
732 {
733 stlbrd_t *brdp;
734 stlpanel_t *panelp;
735 stlport_t *portp;
736 int i, j, k;
737
738 #ifdef DEBUG
739 printk("cleanup_module()\n");
740 #endif
741
742 printk(KERN_INFO "Unloading %s: version %s\n", stl_drvtitle,
743 stl_drvversion);
744
745 /*
746 * Free up all allocated resources used by the ports. This includes
747 * memory and interrupts. As part of this process we will also do
748 * a hangup on every open port - to try to flush out any processes
749 * hanging onto ports.
750 */
751 i = tty_unregister_driver(stl_serial);
752 put_tty_driver(stl_serial);
753 if (i) {
754 printk("STALLION: failed to un-register tty driver, "
755 "errno=%d\n", -i);
756 return;
757 }
758 for (i = 0; i < 4; i++)
759 class_device_destroy(stallion_class, MKDEV(STL_SIOMEMMAJOR, i));
760 if ((i = unregister_chrdev(STL_SIOMEMMAJOR, "staliomem")))
761 printk("STALLION: failed to un-register serial memory device, "
762 "errno=%d\n", -i);
763 class_destroy(stallion_class);
764
765 for (i = 0; (i < stl_nrbrds); i++) {
766 if ((brdp = stl_brds[i]) == (stlbrd_t *) NULL)
767 continue;
768
769 free_irq(brdp->irq, brdp);
770
771 for (j = 0; (j < STL_MAXPANELS); j++) {
772 panelp = brdp->panels[j];
773 if (panelp == (stlpanel_t *) NULL)
774 continue;
775 for (k = 0; (k < STL_PORTSPERPANEL); k++) {
776 portp = panelp->ports[k];
777 if (portp == (stlport_t *) NULL)
778 continue;
779 if (portp->tty != (struct tty_struct *) NULL)
780 stl_hangup(portp->tty);
781 kfree(portp->tx.buf);
782 kfree(portp);
783 }
784 kfree(panelp);
785 }
786
787 release_region(brdp->ioaddr1, brdp->iosize1);
788 if (brdp->iosize2 > 0)
789 release_region(brdp->ioaddr2, brdp->iosize2);
790
791 kfree(brdp);
792 stl_brds[i] = (stlbrd_t *) NULL;
793 }
794 }
795
796 module_init(stallion_module_init);
797 module_exit(stallion_module_exit);
798
799 /*****************************************************************************/
800
801 /*
802 * Check for any arguments passed in on the module load command line.
803 */
804
805 static void stl_argbrds(void)
806 {
807 stlconf_t conf;
808 stlbrd_t *brdp;
809 int i;
810
811 #ifdef DEBUG
812 printk("stl_argbrds()\n");
813 #endif
814
815 for (i = stl_nrbrds; (i < stl_nargs); i++) {
816 memset(&conf, 0, sizeof(conf));
817 if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
818 continue;
819 if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
820 continue;
821 stl_nrbrds = i + 1;
822 brdp->brdnr = i;
823 brdp->brdtype = conf.brdtype;
824 brdp->ioaddr1 = conf.ioaddr1;
825 brdp->ioaddr2 = conf.ioaddr2;
826 brdp->irq = conf.irq;
827 brdp->irqtype = conf.irqtype;
828 stl_brdinit(brdp);
829 }
830 }
831
832 /*****************************************************************************/
833
834 /*
835 * Convert an ascii string number into an unsigned long.
836 */
837
838 static unsigned long stl_atol(char *str)
839 {
840 unsigned long val;
841 int base, c;
842 char *sp;
843
844 val = 0;
845 sp = str;
846 if ((*sp == '0') && (*(sp+1) == 'x')) {
847 base = 16;
848 sp += 2;
849 } else if (*sp == '0') {
850 base = 8;
851 sp++;
852 } else {
853 base = 10;
854 }
855
856 for (; (*sp != 0); sp++) {
857 c = (*sp > '9') ? (TOLOWER(*sp) - 'a' + 10) : (*sp - '0');
858 if ((c < 0) || (c >= base)) {
859 printk("STALLION: invalid argument %s\n", str);
860 val = 0;
861 break;
862 }
863 val = (val * base) + c;
864 }
865 return val;
866 }
867
868 /*****************************************************************************/
869
870 /*
871 * Parse the supplied argument string, into the board conf struct.
872 */
873
874 static int stl_parsebrd(stlconf_t *confp, char **argp)
875 {
876 char *sp;
877 int i;
878
879 #ifdef DEBUG
880 printk("stl_parsebrd(confp=%x,argp=%x)\n", (int) confp, (int) argp);
881 #endif
882
883 if ((argp[0] == (char *) NULL) || (*argp[0] == 0))
884 return 0;
885
886 for (sp = argp[0], i = 0; ((*sp != 0) && (i < 25)); sp++, i++)
887 *sp = TOLOWER(*sp);
888
889 for (i = 0; i < ARRAY_SIZE(stl_brdstr); i++) {
890 if (strcmp(stl_brdstr[i].name, argp[0]) == 0)
891 break;
892 }
893 if (i == ARRAY_SIZE(stl_brdstr)) {
894 printk("STALLION: unknown board name, %s?\n", argp[0]);
895 return 0;
896 }
897
898 confp->brdtype = stl_brdstr[i].type;
899
900 i = 1;
901 if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
902 confp->ioaddr1 = stl_atol(argp[i]);
903 i++;
904 if (confp->brdtype == BRD_ECH) {
905 if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
906 confp->ioaddr2 = stl_atol(argp[i]);
907 i++;
908 }
909 if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
910 confp->irq = stl_atol(argp[i]);
911 return 1;
912 }
913
914 /*****************************************************************************/
915
916 /*
917 * Allocate a new board structure. Fill out the basic info in it.
918 */
919
920 static stlbrd_t *stl_allocbrd(void)
921 {
922 stlbrd_t *brdp;
923
924 brdp = kzalloc(sizeof(stlbrd_t), GFP_KERNEL);
925 if (!brdp) {
926 printk("STALLION: failed to allocate memory (size=%Zd)\n",
927 sizeof(stlbrd_t));
928 return NULL;
929 }
930
931 brdp->magic = STL_BOARDMAGIC;
932 return brdp;
933 }
934
935 /*****************************************************************************/
936
937 static int stl_open(struct tty_struct *tty, struct file *filp)
938 {
939 stlport_t *portp;
940 stlbrd_t *brdp;
941 unsigned int minordev;
942 int brdnr, panelnr, portnr, rc;
943
944 #ifdef DEBUG
945 printk("stl_open(tty=%x,filp=%x): device=%s\n", (int) tty,
946 (int) filp, tty->name);
947 #endif
948
949 minordev = tty->index;
950 brdnr = MINOR2BRD(minordev);
951 if (brdnr >= stl_nrbrds)
952 return -ENODEV;
953 brdp = stl_brds[brdnr];
954 if (brdp == (stlbrd_t *) NULL)
955 return -ENODEV;
956 minordev = MINOR2PORT(minordev);
957 for (portnr = -1, panelnr = 0; (panelnr < STL_MAXPANELS); panelnr++) {
958 if (brdp->panels[panelnr] == (stlpanel_t *) NULL)
959 break;
960 if (minordev < brdp->panels[panelnr]->nrports) {
961 portnr = minordev;
962 break;
963 }
964 minordev -= brdp->panels[panelnr]->nrports;
965 }
966 if (portnr < 0)
967 return -ENODEV;
968
969 portp = brdp->panels[panelnr]->ports[portnr];
970 if (portp == (stlport_t *) NULL)
971 return -ENODEV;
972
973 /*
974 * On the first open of the device setup the port hardware, and
975 * initialize the per port data structure.
976 */
977 portp->tty = tty;
978 tty->driver_data = portp;
979 portp->refcount++;
980
981 if ((portp->flags & ASYNC_INITIALIZED) == 0) {
982 if (!portp->tx.buf) {
983 portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
984 if (!portp->tx.buf)
985 return -ENOMEM;
986 portp->tx.head = portp->tx.buf;
987 portp->tx.tail = portp->tx.buf;
988 }
989 stl_setport(portp, tty->termios);
990 portp->sigs = stl_getsignals(portp);
991 stl_setsignals(portp, 1, 1);
992 stl_enablerxtx(portp, 1, 1);
993 stl_startrxtx(portp, 1, 0);
994 clear_bit(TTY_IO_ERROR, &tty->flags);
995 portp->flags |= ASYNC_INITIALIZED;
996 }
997
998 /*
999 * Check if this port is in the middle of closing. If so then wait
1000 * until it is closed then return error status, based on flag settings.
1001 * The sleep here does not need interrupt protection since the wakeup
1002 * for it is done with the same context.
1003 */
1004 if (portp->flags & ASYNC_CLOSING) {
1005 interruptible_sleep_on(&portp->close_wait);
1006 if (portp->flags & ASYNC_HUP_NOTIFY)
1007 return -EAGAIN;
1008 return -ERESTARTSYS;
1009 }
1010
1011 /*
1012 * Based on type of open being done check if it can overlap with any
1013 * previous opens still in effect. If we are a normal serial device
1014 * then also we might have to wait for carrier.
1015 */
1016 if (!(filp->f_flags & O_NONBLOCK)) {
1017 if ((rc = stl_waitcarrier(portp, filp)) != 0)
1018 return rc;
1019 }
1020 portp->flags |= ASYNC_NORMAL_ACTIVE;
1021
1022 return 0;
1023 }
1024
1025 /*****************************************************************************/
1026
1027 /*
1028 * Possibly need to wait for carrier (DCD signal) to come high. Say
1029 * maybe because if we are clocal then we don't need to wait...
1030 */
1031
1032 static int stl_waitcarrier(stlport_t *portp, struct file *filp)
1033 {
1034 unsigned long flags;
1035 int rc, doclocal;
1036
1037 #ifdef DEBUG
1038 printk("stl_waitcarrier(portp=%x,filp=%x)\n", (int) portp, (int) filp);
1039 #endif
1040
1041 rc = 0;
1042 doclocal = 0;
1043
1044 spin_lock_irqsave(&stallion_lock, flags);
1045
1046 if (portp->tty->termios->c_cflag & CLOCAL)
1047 doclocal++;
1048
1049 portp->openwaitcnt++;
1050 if (! tty_hung_up_p(filp))
1051 portp->refcount--;
1052
1053 for (;;) {
1054 /* Takes brd_lock internally */
1055 stl_setsignals(portp, 1, 1);
1056 if (tty_hung_up_p(filp) ||
1057 ((portp->flags & ASYNC_INITIALIZED) == 0)) {
1058 if (portp->flags & ASYNC_HUP_NOTIFY)
1059 rc = -EBUSY;
1060 else
1061 rc = -ERESTARTSYS;
1062 break;
1063 }
1064 if (((portp->flags & ASYNC_CLOSING) == 0) &&
1065 (doclocal || (portp->sigs & TIOCM_CD))) {
1066 break;
1067 }
1068 if (signal_pending(current)) {
1069 rc = -ERESTARTSYS;
1070 break;
1071 }
1072 /* FIXME */
1073 interruptible_sleep_on(&portp->open_wait);
1074 }
1075
1076 if (! tty_hung_up_p(filp))
1077 portp->refcount++;
1078 portp->openwaitcnt--;
1079 spin_unlock_irqrestore(&stallion_lock, flags);
1080
1081 return rc;
1082 }
1083
1084 /*****************************************************************************/
1085
1086 static void stl_close(struct tty_struct *tty, struct file *filp)
1087 {
1088 stlport_t *portp;
1089 unsigned long flags;
1090
1091 #ifdef DEBUG
1092 printk("stl_close(tty=%x,filp=%x)\n", (int) tty, (int) filp);
1093 #endif
1094
1095 portp = tty->driver_data;
1096 if (portp == (stlport_t *) NULL)
1097 return;
1098
1099 spin_lock_irqsave(&stallion_lock, flags);
1100 if (tty_hung_up_p(filp)) {
1101 spin_unlock_irqrestore(&stallion_lock, flags);
1102 return;
1103 }
1104 if ((tty->count == 1) && (portp->refcount != 1))
1105 portp->refcount = 1;
1106 if (portp->refcount-- > 1) {
1107 spin_unlock_irqrestore(&stallion_lock, flags);
1108 return;
1109 }
1110
1111 portp->refcount = 0;
1112 portp->flags |= ASYNC_CLOSING;
1113
1114 /*
1115 * May want to wait for any data to drain before closing. The BUSY
1116 * flag keeps track of whether we are still sending or not - it is
1117 * very accurate for the cd1400, not quite so for the sc26198.
1118 * (The sc26198 has no "end-of-data" interrupt only empty FIFO)
1119 */
1120 tty->closing = 1;
1121
1122 spin_unlock_irqrestore(&stallion_lock, flags);
1123
1124 if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1125 tty_wait_until_sent(tty, portp->closing_wait);
1126 stl_waituntilsent(tty, (HZ / 2));
1127
1128
1129 spin_lock_irqsave(&stallion_lock, flags);
1130 portp->flags &= ~ASYNC_INITIALIZED;
1131 spin_unlock_irqrestore(&stallion_lock, flags);
1132
1133 stl_disableintrs(portp);
1134 if (tty->termios->c_cflag & HUPCL)
1135 stl_setsignals(portp, 0, 0);
1136 stl_enablerxtx(portp, 0, 0);
1137 stl_flushbuffer(tty);
1138 portp->istate = 0;
1139 if (portp->tx.buf != (char *) NULL) {
1140 kfree(portp->tx.buf);
1141 portp->tx.buf = (char *) NULL;
1142 portp->tx.head = (char *) NULL;
1143 portp->tx.tail = (char *) NULL;
1144 }
1145 set_bit(TTY_IO_ERROR, &tty->flags);
1146 tty_ldisc_flush(tty);
1147
1148 tty->closing = 0;
1149 portp->tty = (struct tty_struct *) NULL;
1150
1151 if (portp->openwaitcnt) {
1152 if (portp->close_delay)
1153 msleep_interruptible(jiffies_to_msecs(portp->close_delay));
1154 wake_up_interruptible(&portp->open_wait);
1155 }
1156
1157 portp->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1158 wake_up_interruptible(&portp->close_wait);
1159 }
1160
1161 /*****************************************************************************/
1162
1163 /*
1164 * Write routine. Take data and stuff it in to the TX ring queue.
1165 * If transmit interrupts are not running then start them.
1166 */
1167
1168 static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count)
1169 {
1170 stlport_t *portp;
1171 unsigned int len, stlen;
1172 unsigned char *chbuf;
1173 char *head, *tail;
1174
1175 #ifdef DEBUG
1176 printk("stl_write(tty=%x,buf=%x,count=%d)\n",
1177 (int) tty, (int) buf, count);
1178 #endif
1179
1180 portp = tty->driver_data;
1181 if (portp == (stlport_t *) NULL)
1182 return 0;
1183 if (portp->tx.buf == (char *) NULL)
1184 return 0;
1185
1186 /*
1187 * If copying direct from user space we must cater for page faults,
1188 * causing us to "sleep" here for a while. To handle this copy in all
1189 * the data we need now, into a local buffer. Then when we got it all
1190 * copy it into the TX buffer.
1191 */
1192 chbuf = (unsigned char *) buf;
1193
1194 head = portp->tx.head;
1195 tail = portp->tx.tail;
1196 if (head >= tail) {
1197 len = STL_TXBUFSIZE - (head - tail) - 1;
1198 stlen = STL_TXBUFSIZE - (head - portp->tx.buf);
1199 } else {
1200 len = tail - head - 1;
1201 stlen = len;
1202 }
1203
1204 len = MIN(len, count);
1205 count = 0;
1206 while (len > 0) {
1207 stlen = MIN(len, stlen);
1208 memcpy(head, chbuf, stlen);
1209 len -= stlen;
1210 chbuf += stlen;
1211 count += stlen;
1212 head += stlen;
1213 if (head >= (portp->tx.buf + STL_TXBUFSIZE)) {
1214 head = portp->tx.buf;
1215 stlen = tail - head;
1216 }
1217 }
1218 portp->tx.head = head;
1219
1220 clear_bit(ASYI_TXLOW, &portp->istate);
1221 stl_startrxtx(portp, -1, 1);
1222
1223 return count;
1224 }
1225
1226 /*****************************************************************************/
1227
1228 static void stl_putchar(struct tty_struct *tty, unsigned char ch)
1229 {
1230 stlport_t *portp;
1231 unsigned int len;
1232 char *head, *tail;
1233
1234 #ifdef DEBUG
1235 printk("stl_putchar(tty=%x,ch=%x)\n", (int) tty, (int) ch);
1236 #endif
1237
1238 if (tty == (struct tty_struct *) NULL)
1239 return;
1240 portp = tty->driver_data;
1241 if (portp == (stlport_t *) NULL)
1242 return;
1243 if (portp->tx.buf == (char *) NULL)
1244 return;
1245
1246 head = portp->tx.head;
1247 tail = portp->tx.tail;
1248
1249 len = (head >= tail) ? (STL_TXBUFSIZE - (head - tail)) : (tail - head);
1250 len--;
1251
1252 if (len > 0) {
1253 *head++ = ch;
1254 if (head >= (portp->tx.buf + STL_TXBUFSIZE))
1255 head = portp->tx.buf;
1256 }
1257 portp->tx.head = head;
1258 }
1259
1260 /*****************************************************************************/
1261
1262 /*
1263 * If there are any characters in the buffer then make sure that TX
1264 * interrupts are on and get'em out. Normally used after the putchar
1265 * routine has been called.
1266 */
1267
1268 static void stl_flushchars(struct tty_struct *tty)
1269 {
1270 stlport_t *portp;
1271
1272 #ifdef DEBUG
1273 printk("stl_flushchars(tty=%x)\n", (int) tty);
1274 #endif
1275
1276 if (tty == (struct tty_struct *) NULL)
1277 return;
1278 portp = tty->driver_data;
1279 if (portp == (stlport_t *) NULL)
1280 return;
1281 if (portp->tx.buf == (char *) NULL)
1282 return;
1283
1284 stl_startrxtx(portp, -1, 1);
1285 }
1286
1287 /*****************************************************************************/
1288
1289 static int stl_writeroom(struct tty_struct *tty)
1290 {
1291 stlport_t *portp;
1292 char *head, *tail;
1293
1294 #ifdef DEBUG
1295 printk("stl_writeroom(tty=%x)\n", (int) tty);
1296 #endif
1297
1298 if (tty == (struct tty_struct *) NULL)
1299 return 0;
1300 portp = tty->driver_data;
1301 if (portp == (stlport_t *) NULL)
1302 return 0;
1303 if (portp->tx.buf == (char *) NULL)
1304 return 0;
1305
1306 head = portp->tx.head;
1307 tail = portp->tx.tail;
1308 return ((head >= tail) ? (STL_TXBUFSIZE - (head - tail) - 1) : (tail - head - 1));
1309 }
1310
1311 /*****************************************************************************/
1312
1313 /*
1314 * Return number of chars in the TX buffer. Normally we would just
1315 * calculate the number of chars in the buffer and return that, but if
1316 * the buffer is empty and TX interrupts are still on then we return
1317 * that the buffer still has 1 char in it. This way whoever called us
1318 * will not think that ALL chars have drained - since the UART still
1319 * must have some chars in it (we are busy after all).
1320 */
1321
1322 static int stl_charsinbuffer(struct tty_struct *tty)
1323 {
1324 stlport_t *portp;
1325 unsigned int size;
1326 char *head, *tail;
1327
1328 #ifdef DEBUG
1329 printk("stl_charsinbuffer(tty=%x)\n", (int) tty);
1330 #endif
1331
1332 if (tty == (struct tty_struct *) NULL)
1333 return 0;
1334 portp = tty->driver_data;
1335 if (portp == (stlport_t *) NULL)
1336 return 0;
1337 if (portp->tx.buf == (char *) NULL)
1338 return 0;
1339
1340 head = portp->tx.head;
1341 tail = portp->tx.tail;
1342 size = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
1343 if ((size == 0) && test_bit(ASYI_TXBUSY, &portp->istate))
1344 size = 1;
1345 return size;
1346 }
1347
1348 /*****************************************************************************/
1349
1350 /*
1351 * Generate the serial struct info.
1352 */
1353
1354 static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp)
1355 {
1356 struct serial_struct sio;
1357 stlbrd_t *brdp;
1358
1359 #ifdef DEBUG
1360 printk("stl_getserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
1361 #endif
1362
1363 memset(&sio, 0, sizeof(struct serial_struct));
1364 sio.line = portp->portnr;
1365 sio.port = portp->ioaddr;
1366 sio.flags = portp->flags;
1367 sio.baud_base = portp->baud_base;
1368 sio.close_delay = portp->close_delay;
1369 sio.closing_wait = portp->closing_wait;
1370 sio.custom_divisor = portp->custom_divisor;
1371 sio.hub6 = 0;
1372 if (portp->uartp == &stl_cd1400uart) {
1373 sio.type = PORT_CIRRUS;
1374 sio.xmit_fifo_size = CD1400_TXFIFOSIZE;
1375 } else {
1376 sio.type = PORT_UNKNOWN;
1377 sio.xmit_fifo_size = SC26198_TXFIFOSIZE;
1378 }
1379
1380 brdp = stl_brds[portp->brdnr];
1381 if (brdp != (stlbrd_t *) NULL)
1382 sio.irq = brdp->irq;
1383
1384 return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
1385 }
1386
1387 /*****************************************************************************/
1388
1389 /*
1390 * Set port according to the serial struct info.
1391 * At this point we do not do any auto-configure stuff, so we will
1392 * just quietly ignore any requests to change irq, etc.
1393 */
1394
1395 static int stl_setserial(stlport_t *portp, struct serial_struct __user *sp)
1396 {
1397 struct serial_struct sio;
1398
1399 #ifdef DEBUG
1400 printk("stl_setserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
1401 #endif
1402
1403 if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
1404 return -EFAULT;
1405 if (!capable(CAP_SYS_ADMIN)) {
1406 if ((sio.baud_base != portp->baud_base) ||
1407 (sio.close_delay != portp->close_delay) ||
1408 ((sio.flags & ~ASYNC_USR_MASK) !=
1409 (portp->flags & ~ASYNC_USR_MASK)))
1410 return -EPERM;
1411 }
1412
1413 portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
1414 (sio.flags & ASYNC_USR_MASK);
1415 portp->baud_base = sio.baud_base;
1416 portp->close_delay = sio.close_delay;
1417 portp->closing_wait = sio.closing_wait;
1418 portp->custom_divisor = sio.custom_divisor;
1419 stl_setport(portp, portp->tty->termios);
1420 return 0;
1421 }
1422
1423 /*****************************************************************************/
1424
1425 static int stl_tiocmget(struct tty_struct *tty, struct file *file)
1426 {
1427 stlport_t *portp;
1428
1429 if (tty == (struct tty_struct *) NULL)
1430 return -ENODEV;
1431 portp = tty->driver_data;
1432 if (portp == (stlport_t *) NULL)
1433 return -ENODEV;
1434 if (tty->flags & (1 << TTY_IO_ERROR))
1435 return -EIO;
1436
1437 return stl_getsignals(portp);
1438 }
1439
1440 static int stl_tiocmset(struct tty_struct *tty, struct file *file,
1441 unsigned int set, unsigned int clear)
1442 {
1443 stlport_t *portp;
1444 int rts = -1, dtr = -1;
1445
1446 if (tty == (struct tty_struct *) NULL)
1447 return -ENODEV;
1448 portp = tty->driver_data;
1449 if (portp == (stlport_t *) NULL)
1450 return -ENODEV;
1451 if (tty->flags & (1 << TTY_IO_ERROR))
1452 return -EIO;
1453
1454 if (set & TIOCM_RTS)
1455 rts = 1;
1456 if (set & TIOCM_DTR)
1457 dtr = 1;
1458 if (clear & TIOCM_RTS)
1459 rts = 0;
1460 if (clear & TIOCM_DTR)
1461 dtr = 0;
1462
1463 stl_setsignals(portp, dtr, rts);
1464 return 0;
1465 }
1466
1467 static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1468 {
1469 stlport_t *portp;
1470 unsigned int ival;
1471 int rc;
1472 void __user *argp = (void __user *)arg;
1473
1474 #ifdef DEBUG
1475 printk("stl_ioctl(tty=%x,file=%x,cmd=%x,arg=%x)\n",
1476 (int) tty, (int) file, cmd, (int) arg);
1477 #endif
1478
1479 if (tty == (struct tty_struct *) NULL)
1480 return -ENODEV;
1481 portp = tty->driver_data;
1482 if (portp == (stlport_t *) NULL)
1483 return -ENODEV;
1484
1485 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1486 (cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS)) {
1487 if (tty->flags & (1 << TTY_IO_ERROR))
1488 return -EIO;
1489 }
1490
1491 rc = 0;
1492
1493 switch (cmd) {
1494 case TIOCGSOFTCAR:
1495 rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
1496 (unsigned __user *) argp);
1497 break;
1498 case TIOCSSOFTCAR:
1499 if (get_user(ival, (unsigned int __user *) arg))
1500 return -EFAULT;
1501 tty->termios->c_cflag =
1502 (tty->termios->c_cflag & ~CLOCAL) |
1503 (ival ? CLOCAL : 0);
1504 break;
1505 case TIOCGSERIAL:
1506 rc = stl_getserial(portp, argp);
1507 break;
1508 case TIOCSSERIAL:
1509 rc = stl_setserial(portp, argp);
1510 break;
1511 case COM_GETPORTSTATS:
1512 rc = stl_getportstats(portp, argp);
1513 break;
1514 case COM_CLRPORTSTATS:
1515 rc = stl_clrportstats(portp, argp);
1516 break;
1517 case TIOCSERCONFIG:
1518 case TIOCSERGWILD:
1519 case TIOCSERSWILD:
1520 case TIOCSERGETLSR:
1521 case TIOCSERGSTRUCT:
1522 case TIOCSERGETMULTI:
1523 case TIOCSERSETMULTI:
1524 default:
1525 rc = -ENOIOCTLCMD;
1526 break;
1527 }
1528
1529 return rc;
1530 }
1531
1532 /*****************************************************************************/
1533
1534 static void stl_settermios(struct tty_struct *tty, struct termios *old)
1535 {
1536 stlport_t *portp;
1537 struct termios *tiosp;
1538
1539 #ifdef DEBUG
1540 printk("stl_settermios(tty=%x,old=%x)\n", (int) tty, (int) old);
1541 #endif
1542
1543 if (tty == (struct tty_struct *) NULL)
1544 return;
1545 portp = tty->driver_data;
1546 if (portp == (stlport_t *) NULL)
1547 return;
1548
1549 tiosp = tty->termios;
1550 if ((tiosp->c_cflag == old->c_cflag) &&
1551 (tiosp->c_iflag == old->c_iflag))
1552 return;
1553
1554 stl_setport(portp, tiosp);
1555 stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
1556 -1);
1557 if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
1558 tty->hw_stopped = 0;
1559 stl_start(tty);
1560 }
1561 if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
1562 wake_up_interruptible(&portp->open_wait);
1563 }
1564
1565 /*****************************************************************************/
1566
1567 /*
1568 * Attempt to flow control who ever is sending us data. Based on termios
1569 * settings use software or/and hardware flow control.
1570 */
1571
1572 static void stl_throttle(struct tty_struct *tty)
1573 {
1574 stlport_t *portp;
1575
1576 #ifdef DEBUG
1577 printk("stl_throttle(tty=%x)\n", (int) tty);
1578 #endif
1579
1580 if (tty == (struct tty_struct *) NULL)
1581 return;
1582 portp = tty->driver_data;
1583 if (portp == (stlport_t *) NULL)
1584 return;
1585 stl_flowctrl(portp, 0);
1586 }
1587
1588 /*****************************************************************************/
1589
1590 /*
1591 * Unflow control the device sending us data...
1592 */
1593
1594 static void stl_unthrottle(struct tty_struct *tty)
1595 {
1596 stlport_t *portp;
1597
1598 #ifdef DEBUG
1599 printk("stl_unthrottle(tty=%x)\n", (int) tty);
1600 #endif
1601
1602 if (tty == (struct tty_struct *) NULL)
1603 return;
1604 portp = tty->driver_data;
1605 if (portp == (stlport_t *) NULL)
1606 return;
1607 stl_flowctrl(portp, 1);
1608 }
1609
1610 /*****************************************************************************/
1611
1612 /*
1613 * Stop the transmitter. Basically to do this we will just turn TX
1614 * interrupts off.
1615 */
1616
1617 static void stl_stop(struct tty_struct *tty)
1618 {
1619 stlport_t *portp;
1620
1621 #ifdef DEBUG
1622 printk("stl_stop(tty=%x)\n", (int) tty);
1623 #endif
1624
1625 if (tty == (struct tty_struct *) NULL)
1626 return;
1627 portp = tty->driver_data;
1628 if (portp == (stlport_t *) NULL)
1629 return;
1630 stl_startrxtx(portp, -1, 0);
1631 }
1632
1633 /*****************************************************************************/
1634
1635 /*
1636 * Start the transmitter again. Just turn TX interrupts back on.
1637 */
1638
1639 static void stl_start(struct tty_struct *tty)
1640 {
1641 stlport_t *portp;
1642
1643 #ifdef DEBUG
1644 printk("stl_start(tty=%x)\n", (int) tty);
1645 #endif
1646
1647 if (tty == (struct tty_struct *) NULL)
1648 return;
1649 portp = tty->driver_data;
1650 if (portp == (stlport_t *) NULL)
1651 return;
1652 stl_startrxtx(portp, -1, 1);
1653 }
1654
1655 /*****************************************************************************/
1656
1657 /*
1658 * Hangup this port. This is pretty much like closing the port, only
1659 * a little more brutal. No waiting for data to drain. Shutdown the
1660 * port and maybe drop signals.
1661 */
1662
1663 static void stl_hangup(struct tty_struct *tty)
1664 {
1665 stlport_t *portp;
1666
1667 #ifdef DEBUG
1668 printk("stl_hangup(tty=%x)\n", (int) tty);
1669 #endif
1670
1671 if (tty == (struct tty_struct *) NULL)
1672 return;
1673 portp = tty->driver_data;
1674 if (portp == (stlport_t *) NULL)
1675 return;
1676
1677 portp->flags &= ~ASYNC_INITIALIZED;
1678 stl_disableintrs(portp);
1679 if (tty->termios->c_cflag & HUPCL)
1680 stl_setsignals(portp, 0, 0);
1681 stl_enablerxtx(portp, 0, 0);
1682 stl_flushbuffer(tty);
1683 portp->istate = 0;
1684 set_bit(TTY_IO_ERROR, &tty->flags);
1685 if (portp->tx.buf != (char *) NULL) {
1686 kfree(portp->tx.buf);
1687 portp->tx.buf = (char *) NULL;
1688 portp->tx.head = (char *) NULL;
1689 portp->tx.tail = (char *) NULL;
1690 }
1691 portp->tty = (struct tty_struct *) NULL;
1692 portp->flags &= ~ASYNC_NORMAL_ACTIVE;
1693 portp->refcount = 0;
1694 wake_up_interruptible(&portp->open_wait);
1695 }
1696
1697 /*****************************************************************************/
1698
1699 static void stl_flushbuffer(struct tty_struct *tty)
1700 {
1701 stlport_t *portp;
1702
1703 #ifdef DEBUG
1704 printk("stl_flushbuffer(tty=%x)\n", (int) tty);
1705 #endif
1706
1707 if (tty == (struct tty_struct *) NULL)
1708 return;
1709 portp = tty->driver_data;
1710 if (portp == (stlport_t *) NULL)
1711 return;
1712
1713 stl_flush(portp);
1714 tty_wakeup(tty);
1715 }
1716
1717 /*****************************************************************************/
1718
1719 static void stl_breakctl(struct tty_struct *tty, int state)
1720 {
1721 stlport_t *portp;
1722
1723 #ifdef DEBUG
1724 printk("stl_breakctl(tty=%x,state=%d)\n", (int) tty, state);
1725 #endif
1726
1727 if (tty == (struct tty_struct *) NULL)
1728 return;
1729 portp = tty->driver_data;
1730 if (portp == (stlport_t *) NULL)
1731 return;
1732
1733 stl_sendbreak(portp, ((state == -1) ? 1 : 2));
1734 }
1735
1736 /*****************************************************************************/
1737
1738 static void stl_waituntilsent(struct tty_struct *tty, int timeout)
1739 {
1740 stlport_t *portp;
1741 unsigned long tend;
1742
1743 #ifdef DEBUG
1744 printk("stl_waituntilsent(tty=%x,timeout=%d)\n", (int) tty, timeout);
1745 #endif
1746
1747 if (tty == (struct tty_struct *) NULL)
1748 return;
1749 portp = tty->driver_data;
1750 if (portp == (stlport_t *) NULL)
1751 return;
1752
1753 if (timeout == 0)
1754 timeout = HZ;
1755 tend = jiffies + timeout;
1756
1757 while (stl_datastate(portp)) {
1758 if (signal_pending(current))
1759 break;
1760 msleep_interruptible(20);
1761 if (time_after_eq(jiffies, tend))
1762 break;
1763 }
1764 }
1765
1766 /*****************************************************************************/
1767
1768 static void stl_sendxchar(struct tty_struct *tty, char ch)
1769 {
1770 stlport_t *portp;
1771
1772 #ifdef DEBUG
1773 printk("stl_sendxchar(tty=%x,ch=%x)\n", (int) tty, ch);
1774 #endif
1775
1776 if (tty == (struct tty_struct *) NULL)
1777 return;
1778 portp = tty->driver_data;
1779 if (portp == (stlport_t *) NULL)
1780 return;
1781
1782 if (ch == STOP_CHAR(tty))
1783 stl_sendflow(portp, 0);
1784 else if (ch == START_CHAR(tty))
1785 stl_sendflow(portp, 1);
1786 else
1787 stl_putchar(tty, ch);
1788 }
1789
1790 /*****************************************************************************/
1791
1792 #define MAXLINE 80
1793
1794 /*
1795 * Format info for a specified port. The line is deliberately limited
1796 * to 80 characters. (If it is too long it will be truncated, if too
1797 * short then padded with spaces).
1798 */
1799
1800 static int stl_portinfo(stlport_t *portp, int portnr, char *pos)
1801 {
1802 char *sp;
1803 int sigs, cnt;
1804
1805 sp = pos;
1806 sp += sprintf(sp, "%d: uart:%s tx:%d rx:%d",
1807 portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
1808 (int) portp->stats.txtotal, (int) portp->stats.rxtotal);
1809
1810 if (portp->stats.rxframing)
1811 sp += sprintf(sp, " fe:%d", (int) portp->stats.rxframing);
1812 if (portp->stats.rxparity)
1813 sp += sprintf(sp, " pe:%d", (int) portp->stats.rxparity);
1814 if (portp->stats.rxbreaks)
1815 sp += sprintf(sp, " brk:%d", (int) portp->stats.rxbreaks);
1816 if (portp->stats.rxoverrun)
1817 sp += sprintf(sp, " oe:%d", (int) portp->stats.rxoverrun);
1818
1819 sigs = stl_getsignals(portp);
1820 cnt = sprintf(sp, "%s%s%s%s%s ",
1821 (sigs & TIOCM_RTS) ? "|RTS" : "",
1822 (sigs & TIOCM_CTS) ? "|CTS" : "",
1823 (sigs & TIOCM_DTR) ? "|DTR" : "",
1824 (sigs & TIOCM_CD) ? "|DCD" : "",
1825 (sigs & TIOCM_DSR) ? "|DSR" : "");
1826 *sp = ' ';
1827 sp += cnt;
1828
1829 for (cnt = (sp - pos); (cnt < (MAXLINE - 1)); cnt++)
1830 *sp++ = ' ';
1831 if (cnt >= MAXLINE)
1832 pos[(MAXLINE - 2)] = '+';
1833 pos[(MAXLINE - 1)] = '\n';
1834
1835 return MAXLINE;
1836 }
1837
1838 /*****************************************************************************/
1839
1840 /*
1841 * Port info, read from the /proc file system.
1842 */
1843
1844 static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
1845 {
1846 stlbrd_t *brdp;
1847 stlpanel_t *panelp;
1848 stlport_t *portp;
1849 int brdnr, panelnr, portnr, totalport;
1850 int curoff, maxoff;
1851 char *pos;
1852
1853 #ifdef DEBUG
1854 printk("stl_readproc(page=%x,start=%x,off=%x,count=%d,eof=%x,"
1855 "data=%x\n", (int) page, (int) start, (int) off, count,
1856 (int) eof, (int) data);
1857 #endif
1858
1859 pos = page;
1860 totalport = 0;
1861 curoff = 0;
1862
1863 if (off == 0) {
1864 pos += sprintf(pos, "%s: version %s", stl_drvtitle,
1865 stl_drvversion);
1866 while (pos < (page + MAXLINE - 1))
1867 *pos++ = ' ';
1868 *pos++ = '\n';
1869 }
1870 curoff = MAXLINE;
1871
1872 /*
1873 * We scan through for each board, panel and port. The offset is
1874 * calculated on the fly, and irrelevant ports are skipped.
1875 */
1876 for (brdnr = 0; (brdnr < stl_nrbrds); brdnr++) {
1877 brdp = stl_brds[brdnr];
1878 if (brdp == (stlbrd_t *) NULL)
1879 continue;
1880 if (brdp->state == 0)
1881 continue;
1882
1883 maxoff = curoff + (brdp->nrports * MAXLINE);
1884 if (off >= maxoff) {
1885 curoff = maxoff;
1886 continue;
1887 }
1888
1889 totalport = brdnr * STL_MAXPORTS;
1890 for (panelnr = 0; (panelnr < brdp->nrpanels); panelnr++) {
1891 panelp = brdp->panels[panelnr];
1892 if (panelp == (stlpanel_t *) NULL)
1893 continue;
1894
1895 maxoff = curoff + (panelp->nrports * MAXLINE);
1896 if (off >= maxoff) {
1897 curoff = maxoff;
1898 totalport += panelp->nrports;
1899 continue;
1900 }
1901
1902 for (portnr = 0; (portnr < panelp->nrports); portnr++,
1903 totalport++) {
1904 portp = panelp->ports[portnr];
1905 if (portp == (stlport_t *) NULL)
1906 continue;
1907 if (off >= (curoff += MAXLINE))
1908 continue;
1909 if ((pos - page + MAXLINE) > count)
1910 goto stl_readdone;
1911 pos += stl_portinfo(portp, totalport, pos);
1912 }
1913 }
1914 }
1915
1916 *eof = 1;
1917
1918 stl_readdone:
1919 *start = page;
1920 return (pos - page);
1921 }
1922
1923 /*****************************************************************************/
1924
1925 /*
1926 * All board interrupts are vectored through here first. This code then
1927 * calls off to the approrpriate board interrupt handlers.
1928 */
1929
1930 static irqreturn_t stl_intr(int irq, void *dev_id)
1931 {
1932 stlbrd_t *brdp = (stlbrd_t *) dev_id;
1933
1934 #ifdef DEBUG
1935 printk("stl_intr(brdp=%x,irq=%d)\n", (int) brdp, irq);
1936 #endif
1937
1938 return IRQ_RETVAL((* brdp->isr)(brdp));
1939 }
1940
1941 /*****************************************************************************/
1942
1943 /*
1944 * Interrupt service routine for EasyIO board types.
1945 */
1946
1947 static int stl_eiointr(stlbrd_t *brdp)
1948 {
1949 stlpanel_t *panelp;
1950 unsigned int iobase;
1951 int handled = 0;
1952
1953 spin_lock(&brd_lock);
1954 panelp = brdp->panels[0];
1955 iobase = panelp->iobase;
1956 while (inb(brdp->iostatus) & EIO_INTRPEND) {
1957 handled = 1;
1958 (* panelp->isr)(panelp, iobase);
1959 }
1960 spin_unlock(&brd_lock);
1961 return handled;
1962 }
1963
1964 /*****************************************************************************/
1965
1966 /*
1967 * Interrupt service routine for ECH-AT board types.
1968 */
1969
1970 static int stl_echatintr(stlbrd_t *brdp)
1971 {
1972 stlpanel_t *panelp;
1973 unsigned int ioaddr;
1974 int bnknr;
1975 int handled = 0;
1976
1977 outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
1978
1979 while (inb(brdp->iostatus) & ECH_INTRPEND) {
1980 handled = 1;
1981 for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
1982 ioaddr = brdp->bnkstataddr[bnknr];
1983 if (inb(ioaddr) & ECH_PNLINTRPEND) {
1984 panelp = brdp->bnk2panel[bnknr];
1985 (* panelp->isr)(panelp, (ioaddr & 0xfffc));
1986 }
1987 }
1988 }
1989
1990 outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
1991
1992 return handled;
1993 }
1994
1995 /*****************************************************************************/
1996
1997 /*
1998 * Interrupt service routine for ECH-MCA board types.
1999 */
2000
2001 static int stl_echmcaintr(stlbrd_t *brdp)
2002 {
2003 stlpanel_t *panelp;
2004 unsigned int ioaddr;
2005 int bnknr;
2006 int handled = 0;
2007
2008 while (inb(brdp->iostatus) & ECH_INTRPEND) {
2009 handled = 1;
2010 for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
2011 ioaddr = brdp->bnkstataddr[bnknr];
2012 if (inb(ioaddr) & ECH_PNLINTRPEND) {
2013 panelp = brdp->bnk2panel[bnknr];
2014 (* panelp->isr)(panelp, (ioaddr & 0xfffc));
2015 }
2016 }
2017 }
2018 return handled;
2019 }
2020
2021 /*****************************************************************************/
2022
2023 /*
2024 * Interrupt service routine for ECH-PCI board types.
2025 */
2026
2027 static int stl_echpciintr(stlbrd_t *brdp)
2028 {
2029 stlpanel_t *panelp;
2030 unsigned int ioaddr;
2031 int bnknr, recheck;
2032 int handled = 0;
2033
2034 while (1) {
2035 recheck = 0;
2036 for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
2037 outb(brdp->bnkpageaddr[bnknr], brdp->ioctrl);
2038 ioaddr = brdp->bnkstataddr[bnknr];
2039 if (inb(ioaddr) & ECH_PNLINTRPEND) {
2040 panelp = brdp->bnk2panel[bnknr];
2041 (* panelp->isr)(panelp, (ioaddr & 0xfffc));
2042 recheck++;
2043 handled = 1;
2044 }
2045 }
2046 if (! recheck)
2047 break;
2048 }
2049 return handled;
2050 }
2051
2052 /*****************************************************************************/
2053
2054 /*
2055 * Interrupt service routine for ECH-8/64-PCI board types.
2056 */
2057
2058 static int stl_echpci64intr(stlbrd_t *brdp)
2059 {
2060 stlpanel_t *panelp;
2061 unsigned int ioaddr;
2062 int bnknr;
2063 int handled = 0;
2064
2065 while (inb(brdp->ioctrl) & 0x1) {
2066 handled = 1;
2067 for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
2068 ioaddr = brdp->bnkstataddr[bnknr];
2069 if (inb(ioaddr) & ECH_PNLINTRPEND) {
2070 panelp = brdp->bnk2panel[bnknr];
2071 (* panelp->isr)(panelp, (ioaddr & 0xfffc));
2072 }
2073 }
2074 }
2075
2076 return handled;
2077 }
2078
2079 /*****************************************************************************/
2080
2081 /*
2082 * Service an off-level request for some channel.
2083 */
2084 static void stl_offintr(struct work_struct *work)
2085 {
2086 stlport_t *portp = container_of(work, stlport_t, tqueue);
2087 struct tty_struct *tty;
2088 unsigned int oldsigs;
2089
2090 #ifdef DEBUG
2091 printk("stl_offintr(portp=%x)\n", (int) portp);
2092 #endif
2093
2094 if (portp == (stlport_t *) NULL)
2095 return;
2096
2097 tty = portp->tty;
2098 if (tty == (struct tty_struct *) NULL)
2099 return;
2100
2101 lock_kernel();
2102 if (test_bit(ASYI_TXLOW, &portp->istate)) {
2103 tty_wakeup(tty);
2104 }
2105 if (test_bit(ASYI_DCDCHANGE, &portp->istate)) {
2106 clear_bit(ASYI_DCDCHANGE, &portp->istate);
2107 oldsigs = portp->sigs;
2108 portp->sigs = stl_getsignals(portp);
2109 if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
2110 wake_up_interruptible(&portp->open_wait);
2111 if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0)) {
2112 if (portp->flags & ASYNC_CHECK_CD)
2113 tty_hangup(tty); /* FIXME: module removal race here - AKPM */
2114 }
2115 }
2116 unlock_kernel();
2117 }
2118
2119 /*****************************************************************************/
2120
2121 /*
2122 * Initialize all the ports on a panel.
2123 */
2124
2125 static int __init stl_initports(stlbrd_t *brdp, stlpanel_t *panelp)
2126 {
2127 stlport_t *portp;
2128 int chipmask, i;
2129
2130 #ifdef DEBUG
2131 printk("stl_initports(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
2132 #endif
2133
2134 chipmask = stl_panelinit(brdp, panelp);
2135
2136 /*
2137 * All UART's are initialized (if found!). Now go through and setup
2138 * each ports data structures.
2139 */
2140 for (i = 0; (i < panelp->nrports); i++) {
2141 portp = kzalloc(sizeof(stlport_t), GFP_KERNEL);
2142 if (!portp) {
2143 printk("STALLION: failed to allocate memory "
2144 "(size=%Zd)\n", sizeof(stlport_t));
2145 break;
2146 }
2147
2148 portp->magic = STL_PORTMAGIC;
2149 portp->portnr = i;
2150 portp->brdnr = panelp->brdnr;
2151 portp->panelnr = panelp->panelnr;
2152 portp->uartp = panelp->uartp;
2153 portp->clk = brdp->clk;
2154 portp->baud_base = STL_BAUDBASE;
2155 portp->close_delay = STL_CLOSEDELAY;
2156 portp->closing_wait = 30 * HZ;
2157 INIT_WORK(&portp->tqueue, stl_offintr);
2158 init_waitqueue_head(&portp->open_wait);
2159 init_waitqueue_head(&portp->close_wait);
2160 portp->stats.brd = portp->brdnr;
2161 portp->stats.panel = portp->panelnr;
2162 portp->stats.port = portp->portnr;
2163 panelp->ports[i] = portp;
2164 stl_portinit(brdp, panelp, portp);
2165 }
2166
2167 return(0);
2168 }
2169
2170 /*****************************************************************************/
2171
2172 /*
2173 * Try to find and initialize an EasyIO board.
2174 */
2175
2176 static inline int stl_initeio(stlbrd_t *brdp)
2177 {
2178 stlpanel_t *panelp;
2179 unsigned int status;
2180 char *name;
2181 int rc;
2182
2183 #ifdef DEBUG
2184 printk("stl_initeio(brdp=%x)\n", (int) brdp);
2185 #endif
2186
2187 brdp->ioctrl = brdp->ioaddr1 + 1;
2188 brdp->iostatus = brdp->ioaddr1 + 2;
2189
2190 status = inb(brdp->iostatus);
2191 if ((status & EIO_IDBITMASK) == EIO_MK3)
2192 brdp->ioctrl++;
2193
2194 /*
2195 * Handle board specific stuff now. The real difference is PCI
2196 * or not PCI.
2197 */
2198 if (brdp->brdtype == BRD_EASYIOPCI) {
2199 brdp->iosize1 = 0x80;
2200 brdp->iosize2 = 0x80;
2201 name = "serial(EIO-PCI)";
2202 outb(0x41, (brdp->ioaddr2 + 0x4c));
2203 } else {
2204 brdp->iosize1 = 8;
2205 name = "serial(EIO)";
2206 if ((brdp->irq < 0) || (brdp->irq > 15) ||
2207 (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
2208 printk("STALLION: invalid irq=%d for brd=%d\n",
2209 brdp->irq, brdp->brdnr);
2210 return(-EINVAL);
2211 }
2212 outb((stl_vecmap[brdp->irq] | EIO_0WS |
2213 ((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
2214 brdp->ioctrl);
2215 }
2216
2217 if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
2218 printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
2219 "%x conflicts with another device\n", brdp->brdnr,
2220 brdp->ioaddr1);
2221 return(-EBUSY);
2222 }
2223
2224 if (brdp->iosize2 > 0)
2225 if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
2226 printk(KERN_WARNING "STALLION: Warning, board %d I/O "
2227 "address %x conflicts with another device\n",
2228 brdp->brdnr, brdp->ioaddr2);
2229 printk(KERN_WARNING "STALLION: Warning, also "
2230 "releasing board %d I/O address %x \n",
2231 brdp->brdnr, brdp->ioaddr1);
2232 release_region(brdp->ioaddr1, brdp->iosize1);
2233 return(-EBUSY);
2234 }
2235
2236 /*
2237 * Everything looks OK, so let's go ahead and probe for the hardware.
2238 */
2239 brdp->clk = CD1400_CLK;
2240 brdp->isr = stl_eiointr;
2241
2242 switch (status & EIO_IDBITMASK) {
2243 case EIO_8PORTM:
2244 brdp->clk = CD1400_CLK8M;
2245 /* fall thru */
2246 case EIO_8PORTRS:
2247 case EIO_8PORTDI:
2248 brdp->nrports = 8;
2249 break;
2250 case EIO_4PORTRS:
2251 brdp->nrports = 4;
2252 break;
2253 case EIO_MK3:
2254 switch (status & EIO_BRDMASK) {
2255 case ID_BRD4:
2256 brdp->nrports = 4;
2257 break;
2258 case ID_BRD8:
2259 brdp->nrports = 8;
2260 break;
2261 case ID_BRD16:
2262 brdp->nrports = 16;
2263 break;
2264 default:
2265 return(-ENODEV);
2266 }
2267 break;
2268 default:
2269 return(-ENODEV);
2270 }
2271
2272 /*
2273 * We have verified that the board is actually present, so now we
2274 * can complete the setup.
2275 */
2276
2277 panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
2278 if (!panelp) {
2279 printk(KERN_WARNING "STALLION: failed to allocate memory "
2280 "(size=%Zd)\n", sizeof(stlpanel_t));
2281 return -ENOMEM;
2282 }
2283
2284 panelp->magic = STL_PANELMAGIC;
2285 panelp->brdnr = brdp->brdnr;
2286 panelp->panelnr = 0;
2287 panelp->nrports = brdp->nrports;
2288 panelp->iobase = brdp->ioaddr1;
2289 panelp->hwid = status;
2290 if ((status & EIO_IDBITMASK) == EIO_MK3) {
2291 panelp->uartp = (void *) &stl_sc26198uart;
2292 panelp->isr = stl_sc26198intr;
2293 } else {
2294 panelp->uartp = (void *) &stl_cd1400uart;
2295 panelp->isr = stl_cd1400eiointr;
2296 }
2297
2298 brdp->panels[0] = panelp;
2299 brdp->nrpanels = 1;
2300 brdp->state |= BRD_FOUND;
2301 brdp->hwid = status;
2302 if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
2303 printk("STALLION: failed to register interrupt "
2304 "routine for %s irq=%d\n", name, brdp->irq);
2305 rc = -ENODEV;
2306 } else {
2307 rc = 0;
2308 }
2309 return rc;
2310 }
2311
2312 /*****************************************************************************/
2313
2314 /*
2315 * Try to find an ECH board and initialize it. This code is capable of
2316 * dealing with all types of ECH board.
2317 */
2318
2319 static inline int stl_initech(stlbrd_t *brdp)
2320 {
2321 stlpanel_t *panelp;
2322 unsigned int status, nxtid, ioaddr, conflict;
2323 int panelnr, banknr, i;
2324 char *name;
2325
2326 #ifdef DEBUG
2327 printk("stl_initech(brdp=%x)\n", (int) brdp);
2328 #endif
2329
2330 status = 0;
2331 conflict = 0;
2332
2333 /*
2334 * Set up the initial board register contents for boards. This varies a
2335 * bit between the different board types. So we need to handle each
2336 * separately. Also do a check that the supplied IRQ is good.
2337 */
2338 switch (brdp->brdtype) {
2339
2340 case BRD_ECH:
2341 brdp->isr = stl_echatintr;
2342 brdp->ioctrl = brdp->ioaddr1 + 1;
2343 brdp->iostatus = brdp->ioaddr1 + 1;
2344 status = inb(brdp->iostatus);
2345 if ((status & ECH_IDBITMASK) != ECH_ID)
2346 return(-ENODEV);
2347 if ((brdp->irq < 0) || (brdp->irq > 15) ||
2348 (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
2349 printk("STALLION: invalid irq=%d for brd=%d\n",
2350 brdp->irq, brdp->brdnr);
2351 return(-EINVAL);
2352 }
2353 status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
2354 status |= (stl_vecmap[brdp->irq] << 1);
2355 outb((status | ECH_BRDRESET), brdp->ioaddr1);
2356 brdp->ioctrlval = ECH_INTENABLE |
2357 ((brdp->irqtype) ? ECH_INTLEVEL : ECH_INTEDGE);
2358 for (i = 0; (i < 10); i++)
2359 outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
2360 brdp->iosize1 = 2;
2361 brdp->iosize2 = 32;
2362 name = "serial(EC8/32)";
2363 outb(status, brdp->ioaddr1);
2364 break;
2365
2366 case BRD_ECHMC:
2367 brdp->isr = stl_echmcaintr;
2368 brdp->ioctrl = brdp->ioaddr1 + 0x20;
2369 brdp->iostatus = brdp->ioctrl;
2370 status = inb(brdp->iostatus);
2371 if ((status & ECH_IDBITMASK) != ECH_ID)
2372 return(-ENODEV);
2373 if ((brdp->irq < 0) || (brdp->irq > 15) ||
2374 (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
2375 printk("STALLION: invalid irq=%d for brd=%d\n",
2376 brdp->irq, brdp->brdnr);
2377 return(-EINVAL);
2378 }
2379 outb(ECHMC_BRDRESET, brdp->ioctrl);
2380 outb(ECHMC_INTENABLE, brdp->ioctrl);
2381 brdp->iosize1 = 64;
2382 name = "serial(EC8/32-MC)";
2383 break;
2384
2385 case BRD_ECHPCI:
2386 brdp->isr = stl_echpciintr;
2387 brdp->ioctrl = brdp->ioaddr1 + 2;
2388 brdp->iosize1 = 4;
2389 brdp->iosize2 = 8;
2390 name = "serial(EC8/32-PCI)";
2391 break;
2392
2393 case BRD_ECH64PCI:
2394 brdp->isr = stl_echpci64intr;
2395 brdp->ioctrl = brdp->ioaddr2 + 0x40;
2396 outb(0x43, (brdp->ioaddr1 + 0x4c));
2397 brdp->iosize1 = 0x80;
2398 brdp->iosize2 = 0x80;
2399 name = "serial(EC8/64-PCI)";
2400 break;
2401
2402 default:
2403 printk("STALLION: unknown board type=%d\n", brdp->brdtype);
2404 return(-EINVAL);
2405 break;
2406 }
2407
2408 /*
2409 * Check boards for possible IO address conflicts and return fail status
2410 * if an IO conflict found.
2411 */
2412 if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
2413 printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
2414 "%x conflicts with another device\n", brdp->brdnr,
2415 brdp->ioaddr1);
2416 return(-EBUSY);
2417 }
2418
2419 if (brdp->iosize2 > 0)
2420 if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
2421 printk(KERN_WARNING "STALLION: Warning, board %d I/O "
2422 "address %x conflicts with another device\n",
2423 brdp->brdnr, brdp->ioaddr2);
2424 printk(KERN_WARNING "STALLION: Warning, also "
2425 "releasing board %d I/O address %x \n",
2426 brdp->brdnr, brdp->ioaddr1);
2427 release_region(brdp->ioaddr1, brdp->iosize1);
2428 return(-EBUSY);
2429 }
2430
2431 /*
2432 * Scan through the secondary io address space looking for panels.
2433 * As we find'em allocate and initialize panel structures for each.
2434 */
2435 brdp->clk = CD1400_CLK;
2436 brdp->hwid = status;
2437
2438 ioaddr = brdp->ioaddr2;
2439 banknr = 0;
2440 panelnr = 0;
2441 nxtid = 0;
2442
2443 for (i = 0; (i < STL_MAXPANELS); i++) {
2444 if (brdp->brdtype == BRD_ECHPCI) {
2445 outb(nxtid, brdp->ioctrl);
2446 ioaddr = brdp->ioaddr2;
2447 }
2448 status = inb(ioaddr + ECH_PNLSTATUS);
2449 if ((status & ECH_PNLIDMASK) != nxtid)
2450 break;
2451 panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
2452 if (!panelp) {
2453 printk("STALLION: failed to allocate memory "
2454 "(size=%Zd)\n", sizeof(stlpanel_t));
2455 break;
2456 }
2457 panelp->magic = STL_PANELMAGIC;
2458 panelp->brdnr = brdp->brdnr;
2459 panelp->panelnr = panelnr;
2460 panelp->iobase = ioaddr;
2461 panelp->pagenr = nxtid;
2462 panelp->hwid = status;
2463 brdp->bnk2panel[banknr] = panelp;
2464 brdp->bnkpageaddr[banknr] = nxtid;
2465 brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;
2466
2467 if (status & ECH_PNLXPID) {
2468 panelp->uartp = (void *) &stl_sc26198uart;
2469 panelp->isr = stl_sc26198intr;
2470 if (status & ECH_PNL16PORT) {
2471 panelp->nrports = 16;
2472 brdp->bnk2panel[banknr] = panelp;
2473 brdp->bnkpageaddr[banknr] = nxtid;
2474 brdp->bnkstataddr[banknr++] = ioaddr + 4 +
2475 ECH_PNLSTATUS;
2476 } else {
2477 panelp->nrports = 8;
2478 }
2479 } else {
2480 panelp->uartp = (void *) &stl_cd1400uart;
2481 panelp->isr = stl_cd1400echintr;
2482 if (status & ECH_PNL16PORT) {
2483 panelp->nrports = 16;
2484 panelp->ackmask = 0x80;
2485 if (brdp->brdtype != BRD_ECHPCI)
2486 ioaddr += EREG_BANKSIZE;
2487 brdp->bnk2panel[banknr] = panelp;
2488 brdp->bnkpageaddr[banknr] = ++nxtid;
2489 brdp->bnkstataddr[banknr++] = ioaddr +
2490 ECH_PNLSTATUS;
2491 } else {
2492 panelp->nrports = 8;
2493 panelp->ackmask = 0xc0;
2494 }
2495 }
2496
2497 nxtid++;
2498 ioaddr += EREG_BANKSIZE;
2499 brdp->nrports += panelp->nrports;
2500 brdp->panels[panelnr++] = panelp;
2501 if ((brdp->brdtype != BRD_ECHPCI) &&
2502 (ioaddr >= (brdp->ioaddr2 + brdp->iosize2)))
2503 break;
2504 }
2505
2506 brdp->nrpanels = panelnr;
2507 brdp->nrbnks = banknr;
2508 if (brdp->brdtype == BRD_ECH)
2509 outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
2510
2511 brdp->state |= BRD_FOUND;
2512 if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
2513 printk("STALLION: failed to register interrupt "
2514 "routine for %s irq=%d\n", name, brdp->irq);
2515 i = -ENODEV;
2516 } else {
2517 i = 0;
2518 }
2519
2520 return(i);
2521 }
2522
2523 /*****************************************************************************/
2524
2525 /*
2526 * Initialize and configure the specified board.
2527 * Scan through all the boards in the configuration and see what we
2528 * can find. Handle EIO and the ECH boards a little differently here
2529 * since the initial search and setup is very different.
2530 */
2531
2532 static int __init stl_brdinit(stlbrd_t *brdp)
2533 {
2534 int i;
2535
2536 #ifdef DEBUG
2537 printk("stl_brdinit(brdp=%x)\n", (int) brdp);
2538 #endif
2539
2540 switch (brdp->brdtype) {
2541 case BRD_EASYIO:
2542 case BRD_EASYIOPCI:
2543 stl_initeio(brdp);
2544 break;
2545 case BRD_ECH:
2546 case BRD_ECHMC:
2547 case BRD_ECHPCI:
2548 case BRD_ECH64PCI:
2549 stl_initech(brdp);
2550 break;
2551 default:
2552 printk("STALLION: board=%d is unknown board type=%d\n",
2553 brdp->brdnr, brdp->brdtype);
2554 return(ENODEV);
2555 }
2556
2557 stl_brds[brdp->brdnr] = brdp;
2558 if ((brdp->state & BRD_FOUND) == 0) {
2559 printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
2560 stl_brdnames[brdp->brdtype], brdp->brdnr,
2561 brdp->ioaddr1, brdp->irq);
2562 return(ENODEV);
2563 }
2564
2565 for (i = 0; (i < STL_MAXPANELS); i++)
2566 if (brdp->panels[i] != (stlpanel_t *) NULL)
2567 stl_initports(brdp, brdp->panels[i]);
2568
2569 printk("STALLION: %s found, board=%d io=%x irq=%d "
2570 "nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
2571 brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
2572 brdp->nrports);
2573 return(0);
2574 }
2575
2576 /*****************************************************************************/
2577
2578 /*
2579 * Find the next available board number that is free.
2580 */
2581
2582 static inline int stl_getbrdnr(void)
2583 {
2584 int i;
2585
2586 for (i = 0; (i < STL_MAXBRDS); i++) {
2587 if (stl_brds[i] == (stlbrd_t *) NULL) {
2588 if (i >= stl_nrbrds)
2589 stl_nrbrds = i + 1;
2590 return(i);
2591 }
2592 }
2593 return(-1);
2594 }
2595
2596 /*****************************************************************************/
2597
2598 #ifdef CONFIG_PCI
2599
2600 /*
2601 * We have a Stallion board. Allocate a board structure and
2602 * initialize it. Read its IO and IRQ resources from PCI
2603 * configuration space.
2604 */
2605
2606 static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp)
2607 {
2608 stlbrd_t *brdp;
2609
2610 #ifdef DEBUG
2611 printk("stl_initpcibrd(brdtype=%d,busnr=%x,devnr=%x)\n", brdtype,
2612 devp->bus->number, devp->devfn);
2613 #endif
2614
2615 if (pci_enable_device(devp))
2616 return(-EIO);
2617 if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
2618 return(-ENOMEM);
2619 if ((brdp->brdnr = stl_getbrdnr()) < 0) {
2620 printk("STALLION: too many boards found, "
2621 "maximum supported %d\n", STL_MAXBRDS);
2622 return(0);
2623 }
2624 brdp->brdtype = brdtype;
2625
2626 /*
2627 * Different Stallion boards use the BAR registers in different ways,
2628 * so set up io addresses based on board type.
2629 */
2630 #ifdef DEBUG
2631 printk("%s(%d): BAR[]=%x,%x,%x,%x IRQ=%x\n", __FILE__, __LINE__,
2632 pci_resource_start(devp, 0), pci_resource_start(devp, 1),
2633 pci_resource_start(devp, 2), pci_resource_start(devp, 3), devp->irq);
2634 #endif
2635
2636 /*
2637 * We have all resources from the board, so let's setup the actual
2638 * board structure now.
2639 */
2640 switch (brdtype) {
2641 case BRD_ECHPCI:
2642 brdp->ioaddr2 = pci_resource_start(devp, 0);
2643 brdp->ioaddr1 = pci_resource_start(devp, 1);
2644 break;
2645 case BRD_ECH64PCI:
2646 brdp->ioaddr2 = pci_resource_start(devp, 2);
2647 brdp->ioaddr1 = pci_resource_start(devp, 1);
2648 break;
2649 case BRD_EASYIOPCI:
2650 brdp->ioaddr1 = pci_resource_start(devp, 2);
2651 brdp->ioaddr2 = pci_resource_start(devp, 1);
2652 break;
2653 default:
2654 printk("STALLION: unknown PCI board type=%d\n", brdtype);
2655 break;
2656 }
2657
2658 brdp->irq = devp->irq;
2659 stl_brdinit(brdp);
2660
2661 return(0);
2662 }
2663
2664 /*****************************************************************************/
2665
2666 /*
2667 * Find all Stallion PCI boards that might be installed. Initialize each
2668 * one as it is found.
2669 */
2670
2671
2672 static inline int stl_findpcibrds(void)
2673 {
2674 struct pci_dev *dev = NULL;
2675 int i, rc;
2676
2677 #ifdef DEBUG
2678 printk("stl_findpcibrds()\n");
2679 #endif
2680
2681 for (i = 0; (i < stl_nrpcibrds); i++)
2682 while ((dev = pci_find_device(stl_pcibrds[i].vendid,
2683 stl_pcibrds[i].devid, dev))) {
2684
2685 /*
2686 * Found a device on the PCI bus that has our vendor and
2687 * device ID. Need to check now that it is really us.
2688 */
2689 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
2690 continue;
2691
2692 rc = stl_initpcibrd(stl_pcibrds[i].brdtype, dev);
2693 if (rc)
2694 return(rc);
2695 }
2696
2697 return(0);
2698 }
2699
2700 #endif
2701
2702 /*****************************************************************************/
2703
2704 /*
2705 * Scan through all the boards in the configuration and see what we
2706 * can find. Handle EIO and the ECH boards a little differently here
2707 * since the initial search and setup is too different.
2708 */
2709
2710 static inline int stl_initbrds(void)
2711 {
2712 stlbrd_t *brdp;
2713 stlconf_t *confp;
2714 int i;
2715
2716 #ifdef DEBUG
2717 printk("stl_initbrds()\n");
2718 #endif
2719
2720 if (stl_nrbrds > STL_MAXBRDS) {
2721 printk("STALLION: too many boards in configuration table, "
2722 "truncating to %d\n", STL_MAXBRDS);
2723 stl_nrbrds = STL_MAXBRDS;
2724 }
2725
2726 /*
2727 * Firstly scan the list of static boards configured. Allocate
2728 * resources and initialize the boards as found.
2729 */
2730 for (i = 0; (i < stl_nrbrds); i++) {
2731 confp = &stl_brdconf[i];
2732 stl_parsebrd(confp, stl_brdsp[i]);
2733 if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
2734 return(-ENOMEM);
2735 brdp->brdnr = i;
2736 brdp->brdtype = confp->brdtype;
2737 brdp->ioaddr1 = confp->ioaddr1;
2738 brdp->ioaddr2 = confp->ioaddr2;
2739 brdp->irq = confp->irq;
2740 brdp->irqtype = confp->irqtype;
2741 stl_brdinit(brdp);
2742 }
2743
2744 /*
2745 * Find any dynamically supported boards. That is via module load
2746 * line options or auto-detected on the PCI bus.
2747 */
2748 stl_argbrds();
2749 #ifdef CONFIG_PCI
2750 stl_findpcibrds();
2751 #endif
2752
2753 return(0);
2754 }
2755
2756 /*****************************************************************************/
2757
2758 /*
2759 * Return the board stats structure to user app.
2760 */
2761
2762 static int stl_getbrdstats(combrd_t __user *bp)
2763 {
2764 stlbrd_t *brdp;
2765 stlpanel_t *panelp;
2766 int i;
2767
2768 if (copy_from_user(&stl_brdstats, bp, sizeof(combrd_t)))
2769 return -EFAULT;
2770 if (stl_brdstats.brd >= STL_MAXBRDS)
2771 return(-ENODEV);
2772 brdp = stl_brds[stl_brdstats.brd];
2773 if (brdp == (stlbrd_t *) NULL)
2774 return(-ENODEV);
2775
2776 memset(&stl_brdstats, 0, sizeof(combrd_t));
2777 stl_brdstats.brd = brdp->brdnr;
2778 stl_brdstats.type = brdp->brdtype;
2779 stl_brdstats.hwid = brdp->hwid;
2780 stl_brdstats.state = brdp->state;
2781 stl_brdstats.ioaddr = brdp->ioaddr1;
2782 stl_brdstats.ioaddr2 = brdp->ioaddr2;
2783 stl_brdstats.irq = brdp->irq;
2784 stl_brdstats.nrpanels = brdp->nrpanels;
2785 stl_brdstats.nrports = brdp->nrports;
2786 for (i = 0; (i < brdp->nrpanels); i++) {
2787 panelp = brdp->panels[i];
2788 stl_brdstats.panels[i].panel = i;
2789 stl_brdstats.panels[i].hwid = panelp->hwid;
2790 stl_brdstats.panels[i].nrports = panelp->nrports;
2791 }
2792
2793 return copy_to_user(bp, &stl_brdstats, sizeof(combrd_t)) ? -EFAULT : 0;
2794 }
2795
2796 /*****************************************************************************/
2797
2798 /*
2799 * Resolve the referenced port number into a port struct pointer.
2800 */
2801
2802 static stlport_t *stl_getport(int brdnr, int panelnr, int portnr)
2803 {
2804 stlbrd_t *brdp;
2805 stlpanel_t *panelp;
2806
2807 if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
2808 return((stlport_t *) NULL);
2809 brdp = stl_brds[brdnr];
2810 if (brdp == (stlbrd_t *) NULL)
2811 return((stlport_t *) NULL);
2812 if ((panelnr < 0) || (panelnr >= brdp->nrpanels))
2813 return((stlport_t *) NULL);
2814 panelp = brdp->panels[panelnr];
2815 if (panelp == (stlpanel_t *) NULL)
2816 return((stlport_t *) NULL);
2817 if ((portnr < 0) || (portnr >= panelp->nrports))
2818 return((stlport_t *) NULL);
2819 return(panelp->ports[portnr]);
2820 }
2821
2822 /*****************************************************************************/
2823
2824 /*
2825 * Return the port stats structure to user app. A NULL port struct
2826 * pointer passed in means that we need to find out from the app
2827 * what port to get stats for (used through board control device).
2828 */
2829
2830 static int stl_getportstats(stlport_t *portp, comstats_t __user *cp)
2831 {
2832 unsigned char *head, *tail;
2833 unsigned long flags;
2834
2835 if (!portp) {
2836 if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
2837 return -EFAULT;
2838 portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
2839 stl_comstats.port);
2840 if (portp == (stlport_t *) NULL)
2841 return(-ENODEV);
2842 }
2843
2844 portp->stats.state = portp->istate;
2845 portp->stats.flags = portp->flags;
2846 portp->stats.hwid = portp->hwid;
2847
2848 portp->stats.ttystate = 0;
2849 portp->stats.cflags = 0;
2850 portp->stats.iflags = 0;
2851 portp->stats.oflags = 0;
2852 portp->stats.lflags = 0;
2853 portp->stats.rxbuffered = 0;
2854
2855 spin_lock_irqsave(&stallion_lock, flags);
2856 if (portp->tty != (struct tty_struct *) NULL) {
2857 if (portp->tty->driver_data == portp) {
2858 portp->stats.ttystate = portp->tty->flags;
2859 /* No longer available as a statistic */
2860 portp->stats.rxbuffered = 1; /*portp->tty->flip.count; */
2861 if (portp->tty->termios != (struct termios *) NULL) {
2862 portp->stats.cflags = portp->tty->termios->c_cflag;
2863 portp->stats.iflags = portp->tty->termios->c_iflag;
2864 portp->stats.oflags = portp->tty->termios->c_oflag;
2865 portp->stats.lflags = portp->tty->termios->c_lflag;
2866 }
2867 }
2868 }
2869 spin_unlock_irqrestore(&stallion_lock, flags);
2870
2871 head = portp->tx.head;
2872 tail = portp->tx.tail;
2873 portp->stats.txbuffered = ((head >= tail) ? (head - tail) :
2874 (STL_TXBUFSIZE - (tail - head)));
2875
2876 portp->stats.signals = (unsigned long) stl_getsignals(portp);
2877
2878 return copy_to_user(cp, &portp->stats,
2879 sizeof(comstats_t)) ? -EFAULT : 0;
2880 }
2881
2882 /*****************************************************************************/
2883
2884 /*
2885 * Clear the port stats structure. We also return it zeroed out...
2886 */
2887
2888 static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp)
2889 {
2890 if (!portp) {
2891 if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
2892 return -EFAULT;
2893 portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
2894 stl_comstats.port);
2895 if (portp == (stlport_t *) NULL)
2896 return(-ENODEV);
2897 }
2898
2899 memset(&portp->stats, 0, sizeof(comstats_t));
2900 portp->stats.brd = portp->brdnr;
2901 portp->stats.panel = portp->panelnr;
2902 portp->stats.port = portp->portnr;
2903 return copy_to_user(cp, &portp->stats,
2904 sizeof(comstats_t)) ? -EFAULT : 0;
2905 }
2906
2907 /*****************************************************************************/
2908
2909 /*
2910 * Return the entire driver ports structure to a user app.
2911 */
2912
2913 static int stl_getportstruct(stlport_t __user *arg)
2914 {
2915 stlport_t *portp;
2916
2917 if (copy_from_user(&stl_dummyport, arg, sizeof(stlport_t)))
2918 return -EFAULT;
2919 portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
2920 stl_dummyport.portnr);
2921 if (!portp)
2922 return -ENODEV;
2923 return copy_to_user(arg, portp, sizeof(stlport_t)) ? -EFAULT : 0;
2924 }
2925
2926 /*****************************************************************************/
2927
2928 /*
2929 * Return the entire driver board structure to a user app.
2930 */
2931
2932 static int stl_getbrdstruct(stlbrd_t __user *arg)
2933 {
2934 stlbrd_t *brdp;
2935
2936 if (copy_from_user(&stl_dummybrd, arg, sizeof(stlbrd_t)))
2937 return -EFAULT;
2938 if ((stl_dummybrd.brdnr < 0) || (stl_dummybrd.brdnr >= STL_MAXBRDS))
2939 return -ENODEV;
2940 brdp = stl_brds[stl_dummybrd.brdnr];
2941 if (!brdp)
2942 return(-ENODEV);
2943 return copy_to_user(arg, brdp, sizeof(stlbrd_t)) ? -EFAULT : 0;
2944 }
2945
2946 /*****************************************************************************/
2947
2948 /*
2949 * The "staliomem" device is also required to do some special operations
2950 * on the board and/or ports. In this driver it is mostly used for stats
2951 * collection.
2952 */
2953
2954 static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
2955 {
2956 int brdnr, rc;
2957 void __user *argp = (void __user *)arg;
2958
2959 #ifdef DEBUG
2960 printk("stl_memioctl(ip=%x,fp=%x,cmd=%x,arg=%x)\n", (int) ip,
2961 (int) fp, cmd, (int) arg);
2962 #endif
2963
2964 brdnr = iminor(ip);
2965 if (brdnr >= STL_MAXBRDS)
2966 return(-ENODEV);
2967 rc = 0;
2968
2969 switch (cmd) {
2970 case COM_GETPORTSTATS:
2971 rc = stl_getportstats(NULL, argp);
2972 break;
2973 case COM_CLRPORTSTATS:
2974 rc = stl_clrportstats(NULL, argp);
2975 break;
2976 case COM_GETBRDSTATS:
2977 rc = stl_getbrdstats(argp);
2978 break;
2979 case COM_READPORT:
2980 rc = stl_getportstruct(argp);
2981 break;
2982 case COM_READBOARD:
2983 rc = stl_getbrdstruct(argp);
2984 break;
2985 default:
2986 rc = -ENOIOCTLCMD;
2987 break;
2988 }
2989
2990 return(rc);
2991 }
2992
2993 static const struct tty_operations stl_ops = {
2994 .open = stl_open,
2995 .close = stl_close,
2996 .write = stl_write,
2997 .put_char = stl_putchar,
2998 .flush_chars = stl_flushchars,
2999 .write_room = stl_writeroom,
3000 .chars_in_buffer = stl_charsinbuffer,
3001 .ioctl = stl_ioctl,
3002 .set_termios = stl_settermios,
3003 .throttle = stl_throttle,
3004 .unthrottle = stl_unthrottle,
3005 .stop = stl_stop,
3006 .start = stl_start,
3007 .hangup = stl_hangup,
3008 .flush_buffer = stl_flushbuffer,
3009 .break_ctl = stl_breakctl,
3010 .wait_until_sent = stl_waituntilsent,
3011 .send_xchar = stl_sendxchar,
3012 .read_proc = stl_readproc,
3013 .tiocmget = stl_tiocmget,
3014 .tiocmset = stl_tiocmset,
3015 };
3016
3017 /*****************************************************************************/
3018
3019 static int __init stl_init(void)
3020 {
3021 int i;
3022 printk(KERN_INFO "%s: version %s\n", stl_drvtitle, stl_drvversion);
3023
3024 spin_lock_init(&stallion_lock);
3025 spin_lock_init(&brd_lock);
3026
3027 stl_initbrds();
3028
3029 stl_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
3030 if (!stl_serial)
3031 return -1;
3032
3033 /*
3034 * Set up a character driver for per board stuff. This is mainly used
3035 * to do stats ioctls on the ports.
3036 */
3037 if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
3038 printk("STALLION: failed to register serial board device\n");
3039
3040 stallion_class = class_create(THIS_MODULE, "staliomem");
3041 for (i = 0; i < 4; i++)
3042 class_device_create(stallion_class, NULL,
3043 MKDEV(STL_SIOMEMMAJOR, i), NULL,
3044 "staliomem%d", i);
3045
3046 stl_serial->owner = THIS_MODULE;
3047 stl_serial->driver_name = stl_drvname;
3048 stl_serial->name = "ttyE";
3049 stl_serial->major = STL_SERIALMAJOR;
3050 stl_serial->minor_start = 0;
3051 stl_serial->type = TTY_DRIVER_TYPE_SERIAL;
3052 stl_serial->subtype = SERIAL_TYPE_NORMAL;
3053 stl_serial->init_termios = stl_deftermios;
3054 stl_serial->flags = TTY_DRIVER_REAL_RAW;
3055 tty_set_operations(stl_serial, &stl_ops);
3056
3057 if (tty_register_driver(stl_serial)) {
3058 put_tty_driver(stl_serial);
3059 printk("STALLION: failed to register serial driver\n");
3060 return -1;
3061 }
3062
3063 return 0;
3064 }
3065
3066 /*****************************************************************************/
3067 /* CD1400 HARDWARE FUNCTIONS */
3068 /*****************************************************************************/
3069
3070 /*
3071 * These functions get/set/update the registers of the cd1400 UARTs.
3072 * Access to the cd1400 registers is via an address/data io port pair.
3073 * (Maybe should make this inline...)
3074 */
3075
3076 static int stl_cd1400getreg(stlport_t *portp, int regnr)
3077 {
3078 outb((regnr + portp->uartaddr), portp->ioaddr);
3079 return inb(portp->ioaddr + EREG_DATA);
3080 }
3081
3082 static void stl_cd1400setreg(stlport_t *portp, int regnr, int value)
3083 {
3084 outb((regnr + portp->uartaddr), portp->ioaddr);
3085 outb(value, portp->ioaddr + EREG_DATA);
3086 }
3087
3088 static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value)
3089 {
3090 outb((regnr + portp->uartaddr), portp->ioaddr);
3091 if (inb(portp->ioaddr + EREG_DATA) != value) {
3092 outb(value, portp->ioaddr + EREG_DATA);
3093 return 1;
3094 }
3095 return 0;
3096 }
3097
3098 /*****************************************************************************/
3099
3100 /*
3101 * Inbitialize the UARTs in a panel. We don't care what sort of board
3102 * these ports are on - since the port io registers are almost
3103 * identical when dealing with ports.
3104 */
3105
3106 static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
3107 {
3108 unsigned int gfrcr;
3109 int chipmask, i, j;
3110 int nrchips, uartaddr, ioaddr;
3111 unsigned long flags;
3112
3113 #ifdef DEBUG
3114 printk("stl_panelinit(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
3115 #endif
3116
3117 spin_lock_irqsave(&brd_lock, flags);
3118 BRDENABLE(panelp->brdnr, panelp->pagenr);
3119
3120 /*
3121 * Check that each chip is present and started up OK.
3122 */
3123 chipmask = 0;
3124 nrchips = panelp->nrports / CD1400_PORTS;
3125 for (i = 0; (i < nrchips); i++) {
3126 if (brdp->brdtype == BRD_ECHPCI) {
3127 outb((panelp->pagenr + (i >> 1)), brdp->ioctrl);
3128 ioaddr = panelp->iobase;
3129 } else {
3130 ioaddr = panelp->iobase + (EREG_BANKSIZE * (i >> 1));
3131 }
3132 uartaddr = (i & 0x01) ? 0x080 : 0;
3133 outb((GFRCR + uartaddr), ioaddr);
3134 outb(0, (ioaddr + EREG_DATA));
3135 outb((CCR + uartaddr), ioaddr);
3136 outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
3137 outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
3138 outb((GFRCR + uartaddr), ioaddr);
3139 for (j = 0; (j < CCR_MAXWAIT); j++) {
3140 if ((gfrcr = inb(ioaddr + EREG_DATA)) != 0)
3141 break;
3142 }
3143 if ((j >= CCR_MAXWAIT) || (gfrcr < 0x40) || (gfrcr > 0x60)) {
3144 printk("STALLION: cd1400 not responding, "
3145 "brd=%d panel=%d chip=%d\n",
3146 panelp->brdnr, panelp->panelnr, i);
3147 continue;
3148 }
3149 chipmask |= (0x1 << i);
3150 outb((PPR + uartaddr), ioaddr);
3151 outb(PPR_SCALAR, (ioaddr + EREG_DATA));
3152 }
3153
3154 BRDDISABLE(panelp->brdnr);
3155 spin_unlock_irqrestore(&brd_lock, flags);
3156 return chipmask;
3157 }
3158
3159 /*****************************************************************************/
3160
3161 /*
3162 * Initialize hardware specific port registers.
3163 */
3164
3165 static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
3166 {
3167 unsigned long flags;
3168 #ifdef DEBUG
3169 printk("stl_cd1400portinit(brdp=%x,panelp=%x,portp=%x)\n",
3170 (int) brdp, (int) panelp, (int) portp);
3171 #endif
3172
3173 if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
3174 (portp == (stlport_t *) NULL))
3175 return;
3176
3177 spin_lock_irqsave(&brd_lock, flags);
3178 portp->ioaddr = panelp->iobase + (((brdp->brdtype == BRD_ECHPCI) ||
3179 (portp->portnr < 8)) ? 0 : EREG_BANKSIZE);
3180 portp->uartaddr = (portp->portnr & 0x04) << 5;
3181 portp->pagenr = panelp->pagenr + (portp->portnr >> 3);
3182
3183 BRDENABLE(portp->brdnr, portp->pagenr);
3184 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3185 stl_cd1400setreg(portp, LIVR, (portp->portnr << 3));
3186 portp->hwid = stl_cd1400getreg(portp, GFRCR);
3187 BRDDISABLE(portp->brdnr);
3188 spin_unlock_irqrestore(&brd_lock, flags);
3189 }
3190
3191 /*****************************************************************************/
3192
3193 /*
3194 * Wait for the command register to be ready. We will poll this,
3195 * since it won't usually take too long to be ready.
3196 */
3197
3198 static void stl_cd1400ccrwait(stlport_t *portp)
3199 {
3200 int i;
3201
3202 for (i = 0; (i < CCR_MAXWAIT); i++) {
3203 if (stl_cd1400getreg(portp, CCR) == 0) {
3204 return;
3205 }
3206 }
3207
3208 printk("STALLION: cd1400 not responding, port=%d panel=%d brd=%d\n",
3209 portp->portnr, portp->panelnr, portp->brdnr);
3210 }
3211
3212 /*****************************************************************************/
3213
3214 /*
3215 * Set up the cd1400 registers for a port based on the termios port
3216 * settings.
3217 */
3218
3219 static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp)
3220 {
3221 stlbrd_t *brdp;
3222 unsigned long flags;
3223 unsigned int clkdiv, baudrate;
3224 unsigned char cor1, cor2, cor3;
3225 unsigned char cor4, cor5, ccr;
3226 unsigned char srer, sreron, sreroff;
3227 unsigned char mcor1, mcor2, rtpr;
3228 unsigned char clk, div;
3229
3230 cor1 = 0;
3231 cor2 = 0;
3232 cor3 = 0;
3233 cor4 = 0;
3234 cor5 = 0;
3235 ccr = 0;
3236 rtpr = 0;
3237 clk = 0;
3238 div = 0;
3239 mcor1 = 0;
3240 mcor2 = 0;
3241 sreron = 0;
3242 sreroff = 0;
3243
3244 brdp = stl_brds[portp->brdnr];
3245 if (brdp == (stlbrd_t *) NULL)
3246 return;
3247
3248 /*
3249 * Set up the RX char ignore mask with those RX error types we
3250 * can ignore. We can get the cd1400 to help us out a little here,
3251 * it will ignore parity errors and breaks for us.
3252 */
3253 portp->rxignoremsk = 0;
3254 if (tiosp->c_iflag & IGNPAR) {
3255 portp->rxignoremsk |= (ST_PARITY | ST_FRAMING | ST_OVERRUN);
3256 cor1 |= COR1_PARIGNORE;
3257 }
3258 if (tiosp->c_iflag & IGNBRK) {
3259 portp->rxignoremsk |= ST_BREAK;
3260 cor4 |= COR4_IGNBRK;
3261 }
3262
3263 portp->rxmarkmsk = ST_OVERRUN;
3264 if (tiosp->c_iflag & (INPCK | PARMRK))
3265 portp->rxmarkmsk |= (ST_PARITY | ST_FRAMING);
3266 if (tiosp->c_iflag & BRKINT)
3267 portp->rxmarkmsk |= ST_BREAK;
3268
3269 /*
3270 * Go through the char size, parity and stop bits and set all the
3271 * option register appropriately.
3272 */
3273 switch (tiosp->c_cflag & CSIZE) {
3274 case CS5:
3275 cor1 |= COR1_CHL5;
3276 break;
3277 case CS6:
3278 cor1 |= COR1_CHL6;
3279 break;
3280 case CS7:
3281 cor1 |= COR1_CHL7;
3282 break;
3283 default:
3284 cor1 |= COR1_CHL8;
3285 break;
3286 }
3287
3288 if (tiosp->c_cflag & CSTOPB)
3289 cor1 |= COR1_STOP2;
3290 else
3291 cor1 |= COR1_STOP1;
3292
3293 if (tiosp->c_cflag & PARENB) {
3294 if (tiosp->c_cflag & PARODD)
3295 cor1 |= (COR1_PARENB | COR1_PARODD);
3296 else
3297 cor1 |= (COR1_PARENB | COR1_PAREVEN);
3298 } else {
3299 cor1 |= COR1_PARNONE;
3300 }
3301
3302 /*
3303 * Set the RX FIFO threshold at 6 chars. This gives a bit of breathing
3304 * space for hardware flow control and the like. This should be set to
3305 * VMIN. Also here we will set the RX data timeout to 10ms - this should
3306 * really be based on VTIME.
3307 */
3308 cor3 |= FIFO_RXTHRESHOLD;
3309 rtpr = 2;
3310
3311 /*
3312 * Calculate the baud rate timers. For now we will just assume that
3313 * the input and output baud are the same. Could have used a baud
3314 * table here, but this way we can generate virtually any baud rate
3315 * we like!
3316 */
3317 baudrate = tiosp->c_cflag & CBAUD;
3318 if (baudrate & CBAUDEX) {
3319 baudrate &= ~CBAUDEX;
3320 if ((baudrate < 1) || (baudrate > 4))
3321 tiosp->c_cflag &= ~CBAUDEX;
3322 else
3323 baudrate += 15;
3324 }
3325 baudrate = stl_baudrates[baudrate];
3326 if ((tiosp->c_cflag & CBAUD) == B38400) {
3327 if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
3328 baudrate = 57600;
3329 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
3330 baudrate = 115200;
3331 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
3332 baudrate = 230400;
3333 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
3334 baudrate = 460800;
3335 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
3336 baudrate = (portp->baud_base / portp->custom_divisor);
3337 }
3338 if (baudrate > STL_CD1400MAXBAUD)
3339 baudrate = STL_CD1400MAXBAUD;
3340
3341 if (baudrate > 0) {
3342 for (clk = 0; (clk < CD1400_NUMCLKS); clk++) {
3343 clkdiv = ((portp->clk / stl_cd1400clkdivs[clk]) / baudrate);
3344 if (clkdiv < 0x100)
3345 break;
3346 }
3347 div = (unsigned char) clkdiv;
3348 }
3349
3350 /*
3351 * Check what form of modem signaling is required and set it up.
3352 */
3353 if ((tiosp->c_cflag & CLOCAL) == 0) {
3354 mcor1 |= MCOR1_DCD;
3355 mcor2 |= MCOR2_DCD;
3356 sreron |= SRER_MODEM;
3357 portp->flags |= ASYNC_CHECK_CD;
3358 } else {
3359 portp->flags &= ~ASYNC_CHECK_CD;
3360 }
3361
3362 /*
3363 * Setup cd1400 enhanced modes if we can. In particular we want to
3364 * handle as much of the flow control as possible automatically. As
3365 * well as saving a few CPU cycles it will also greatly improve flow
3366 * control reliability.
3367 */
3368 if (tiosp->c_iflag & IXON) {
3369 cor2 |= COR2_TXIBE;
3370 cor3 |= COR3_SCD12;
3371 if (tiosp->c_iflag & IXANY)
3372 cor2 |= COR2_IXM;
3373 }
3374
3375 if (tiosp->c_cflag & CRTSCTS) {
3376 cor2 |= COR2_CTSAE;
3377 mcor1 |= FIFO_RTSTHRESHOLD;
3378 }
3379
3380 /*
3381 * All cd1400 register values calculated so go through and set
3382 * them all up.
3383 */
3384
3385 #ifdef DEBUG
3386 printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
3387 portp->portnr, portp->panelnr, portp->brdnr);
3388 printk(" cor1=%x cor2=%x cor3=%x cor4=%x cor5=%x\n",
3389 cor1, cor2, cor3, cor4, cor5);
3390 printk(" mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%x\n",
3391 mcor1, mcor2, rtpr, sreron, sreroff);
3392 printk(" tcor=%x tbpr=%x rcor=%x rbpr=%x\n", clk, div, clk, div);
3393 printk(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
3394 tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
3395 tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
3396 #endif
3397
3398 spin_lock_irqsave(&brd_lock, flags);
3399 BRDENABLE(portp->brdnr, portp->pagenr);
3400 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x3));
3401 srer = stl_cd1400getreg(portp, SRER);
3402 stl_cd1400setreg(portp, SRER, 0);
3403 if (stl_cd1400updatereg(portp, COR1, cor1))
3404 ccr = 1;
3405 if (stl_cd1400updatereg(portp, COR2, cor2))
3406 ccr = 1;
3407 if (stl_cd1400updatereg(portp, COR3, cor3))
3408 ccr = 1;
3409 if (ccr) {
3410 stl_cd1400ccrwait(portp);
3411 stl_cd1400setreg(portp, CCR, CCR_CORCHANGE);
3412 }
3413 stl_cd1400setreg(portp, COR4, cor4);
3414 stl_cd1400setreg(portp, COR5, cor5);
3415 stl_cd1400setreg(portp, MCOR1, mcor1);
3416 stl_cd1400setreg(portp, MCOR2, mcor2);
3417 if (baudrate > 0) {
3418 stl_cd1400setreg(portp, TCOR, clk);
3419 stl_cd1400setreg(portp, TBPR, div);
3420 stl_cd1400setreg(portp, RCOR, clk);
3421 stl_cd1400setreg(portp, RBPR, div);
3422 }
3423 stl_cd1400setreg(portp, SCHR1, tiosp->c_cc[VSTART]);
3424 stl_cd1400setreg(portp, SCHR2, tiosp->c_cc[VSTOP]);
3425 stl_cd1400setreg(portp, SCHR3, tiosp->c_cc[VSTART]);
3426 stl_cd1400setreg(portp, SCHR4, tiosp->c_cc[VSTOP]);
3427 stl_cd1400setreg(portp, RTPR, rtpr);
3428 mcor1 = stl_cd1400getreg(portp, MSVR1);
3429 if (mcor1 & MSVR1_DCD)
3430 portp->sigs |= TIOCM_CD;
3431 else
3432 portp->sigs &= ~TIOCM_CD;
3433 stl_cd1400setreg(portp, SRER, ((srer & ~sreroff) | sreron));
3434 BRDDISABLE(portp->brdnr);
3435 spin_unlock_irqrestore(&brd_lock, flags);
3436 }
3437
3438 /*****************************************************************************/
3439
3440 /*
3441 * Set the state of the DTR and RTS signals.
3442 */
3443
3444 static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts)
3445 {
3446 unsigned char msvr1, msvr2;
3447 unsigned long flags;
3448
3449 #ifdef DEBUG
3450 printk("stl_cd1400setsignals(portp=%x,dtr=%d,rts=%d)\n",
3451 (int) portp, dtr, rts);
3452 #endif
3453
3454 msvr1 = 0;
3455 msvr2 = 0;
3456 if (dtr > 0)
3457 msvr1 = MSVR1_DTR;
3458 if (rts > 0)
3459 msvr2 = MSVR2_RTS;
3460
3461 spin_lock_irqsave(&brd_lock, flags);
3462 BRDENABLE(portp->brdnr, portp->pagenr);
3463 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3464 if (rts >= 0)
3465 stl_cd1400setreg(portp, MSVR2, msvr2);
3466 if (dtr >= 0)
3467 stl_cd1400setreg(portp, MSVR1, msvr1);
3468 BRDDISABLE(portp->brdnr);
3469 spin_unlock_irqrestore(&brd_lock, flags);
3470 }
3471
3472 /*****************************************************************************/
3473
3474 /*
3475 * Return the state of the signals.
3476 */
3477
3478 static int stl_cd1400getsignals(stlport_t *portp)
3479 {
3480 unsigned char msvr1, msvr2;
3481 unsigned long flags;
3482 int sigs;
3483
3484 #ifdef DEBUG
3485 printk("stl_cd1400getsignals(portp=%x)\n", (int) portp);
3486 #endif
3487
3488 spin_lock_irqsave(&brd_lock, flags);
3489 BRDENABLE(portp->brdnr, portp->pagenr);
3490 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3491 msvr1 = stl_cd1400getreg(portp, MSVR1);
3492 msvr2 = stl_cd1400getreg(portp, MSVR2);
3493 BRDDISABLE(portp->brdnr);
3494 spin_unlock_irqrestore(&brd_lock, flags);
3495
3496 sigs = 0;
3497 sigs |= (msvr1 & MSVR1_DCD) ? TIOCM_CD : 0;
3498 sigs |= (msvr1 & MSVR1_CTS) ? TIOCM_CTS : 0;
3499 sigs |= (msvr1 & MSVR1_DTR) ? TIOCM_DTR : 0;
3500 sigs |= (msvr2 & MSVR2_RTS) ? TIOCM_RTS : 0;
3501 #if 0
3502 sigs |= (msvr1 & MSVR1_RI) ? TIOCM_RI : 0;
3503 sigs |= (msvr1 & MSVR1_DSR) ? TIOCM_DSR : 0;
3504 #else
3505 sigs |= TIOCM_DSR;
3506 #endif
3507 return sigs;
3508 }
3509
3510 /*****************************************************************************/
3511
3512 /*
3513 * Enable/Disable the Transmitter and/or Receiver.
3514 */
3515
3516 static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx)
3517 {
3518 unsigned char ccr;
3519 unsigned long flags;
3520
3521 #ifdef DEBUG
3522 printk("stl_cd1400enablerxtx(portp=%x,rx=%d,tx=%d)\n",
3523 (int) portp, rx, tx);
3524 #endif
3525 ccr = 0;
3526
3527 if (tx == 0)
3528 ccr |= CCR_TXDISABLE;
3529 else if (tx > 0)
3530 ccr |= CCR_TXENABLE;
3531 if (rx == 0)
3532 ccr |= CCR_RXDISABLE;
3533 else if (rx > 0)
3534 ccr |= CCR_RXENABLE;
3535
3536 spin_lock_irqsave(&brd_lock, flags);
3537 BRDENABLE(portp->brdnr, portp->pagenr);
3538 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3539 stl_cd1400ccrwait(portp);
3540 stl_cd1400setreg(portp, CCR, ccr);
3541 stl_cd1400ccrwait(portp);
3542 BRDDISABLE(portp->brdnr);
3543 spin_unlock_irqrestore(&brd_lock, flags);
3544 }
3545
3546 /*****************************************************************************/
3547
3548 /*
3549 * Start/stop the Transmitter and/or Receiver.
3550 */
3551
3552 static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx)
3553 {
3554 unsigned char sreron, sreroff;
3555 unsigned long flags;
3556
3557 #ifdef DEBUG
3558 printk("stl_cd1400startrxtx(portp=%x,rx=%d,tx=%d)\n",
3559 (int) portp, rx, tx);
3560 #endif
3561
3562 sreron = 0;
3563 sreroff = 0;
3564 if (tx == 0)
3565 sreroff |= (SRER_TXDATA | SRER_TXEMPTY);
3566 else if (tx == 1)
3567 sreron |= SRER_TXDATA;
3568 else if (tx >= 2)
3569 sreron |= SRER_TXEMPTY;
3570 if (rx == 0)
3571 sreroff |= SRER_RXDATA;
3572 else if (rx > 0)
3573 sreron |= SRER_RXDATA;
3574
3575 spin_lock_irqsave(&brd_lock, flags);
3576 BRDENABLE(portp->brdnr, portp->pagenr);
3577 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3578 stl_cd1400setreg(portp, SRER,
3579 ((stl_cd1400getreg(portp, SRER) & ~sreroff) | sreron));
3580 BRDDISABLE(portp->brdnr);
3581 if (tx > 0)
3582 set_bit(ASYI_TXBUSY, &portp->istate);
3583 spin_unlock_irqrestore(&brd_lock, flags);
3584 }
3585
3586 /*****************************************************************************/
3587
3588 /*
3589 * Disable all interrupts from this port.
3590 */
3591
3592 static void stl_cd1400disableintrs(stlport_t *portp)
3593 {
3594 unsigned long flags;
3595
3596 #ifdef DEBUG
3597 printk("stl_cd1400disableintrs(portp=%x)\n", (int) portp);
3598 #endif
3599 spin_lock_irqsave(&brd_lock, flags);
3600 BRDENABLE(portp->brdnr, portp->pagenr);
3601 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3602 stl_cd1400setreg(portp, SRER, 0);
3603 BRDDISABLE(portp->brdnr);
3604 spin_unlock_irqrestore(&brd_lock, flags);
3605 }
3606
3607 /*****************************************************************************/
3608
3609 static void stl_cd1400sendbreak(stlport_t *portp, int len)
3610 {
3611 unsigned long flags;
3612
3613 #ifdef DEBUG
3614 printk("stl_cd1400sendbreak(portp=%x,len=%d)\n", (int) portp, len);
3615 #endif
3616
3617 spin_lock_irqsave(&brd_lock, flags);
3618 BRDENABLE(portp->brdnr, portp->pagenr);
3619 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3620 stl_cd1400setreg(portp, SRER,
3621 ((stl_cd1400getreg(portp, SRER) & ~SRER_TXDATA) |
3622 SRER_TXEMPTY));
3623 BRDDISABLE(portp->brdnr);
3624 portp->brklen = len;
3625 if (len == 1)
3626 portp->stats.txbreaks++;
3627 spin_unlock_irqrestore(&brd_lock, flags);
3628 }
3629
3630 /*****************************************************************************/
3631
3632 /*
3633 * Take flow control actions...
3634 */
3635
3636 static void stl_cd1400flowctrl(stlport_t *portp, int state)
3637 {
3638 struct tty_struct *tty;
3639 unsigned long flags;
3640
3641 #ifdef DEBUG
3642 printk("stl_cd1400flowctrl(portp=%x,state=%x)\n", (int) portp, state);
3643 #endif
3644
3645 if (portp == (stlport_t *) NULL)
3646 return;
3647 tty = portp->tty;
3648 if (tty == (struct tty_struct *) NULL)
3649 return;
3650
3651 spin_lock_irqsave(&brd_lock, flags);
3652 BRDENABLE(portp->brdnr, portp->pagenr);
3653 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3654
3655 if (state) {
3656 if (tty->termios->c_iflag & IXOFF) {
3657 stl_cd1400ccrwait(portp);
3658 stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
3659 portp->stats.rxxon++;
3660 stl_cd1400ccrwait(portp);
3661 }
3662 /*
3663 * Question: should we return RTS to what it was before? It may
3664 * have been set by an ioctl... Suppose not, since if you have
3665 * hardware flow control set then it is pretty silly to go and
3666 * set the RTS line by hand.
3667 */
3668 if (tty->termios->c_cflag & CRTSCTS) {
3669 stl_cd1400setreg(portp, MCOR1,
3670 (stl_cd1400getreg(portp, MCOR1) |
3671 FIFO_RTSTHRESHOLD));
3672 stl_cd1400setreg(portp, MSVR2, MSVR2_RTS);
3673 portp->stats.rxrtson++;
3674 }
3675 } else {
3676 if (tty->termios->c_iflag & IXOFF) {
3677 stl_cd1400ccrwait(portp);
3678 stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
3679 portp->stats.rxxoff++;
3680 stl_cd1400ccrwait(portp);
3681 }
3682 if (tty->termios->c_cflag & CRTSCTS) {
3683 stl_cd1400setreg(portp, MCOR1,
3684 (stl_cd1400getreg(portp, MCOR1) & 0xf0));
3685 stl_cd1400setreg(portp, MSVR2, 0);
3686 portp->stats.rxrtsoff++;
3687 }
3688 }
3689
3690 BRDDISABLE(portp->brdnr);
3691 spin_unlock_irqrestore(&brd_lock, flags);
3692 }
3693
3694 /*****************************************************************************/
3695
3696 /*
3697 * Send a flow control character...
3698 */
3699
3700 static void stl_cd1400sendflow(stlport_t *portp, int state)
3701 {
3702 struct tty_struct *tty;
3703 unsigned long flags;
3704
3705 #ifdef DEBUG
3706 printk("stl_cd1400sendflow(portp=%x,state=%x)\n", (int) portp, state);
3707 #endif
3708
3709 if (portp == (stlport_t *) NULL)
3710 return;
3711 tty = portp->tty;
3712 if (tty == (struct tty_struct *) NULL)
3713 return;
3714
3715 spin_lock_irqsave(&brd_lock, flags);
3716 BRDENABLE(portp->brdnr, portp->pagenr);
3717 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3718 if (state) {
3719 stl_cd1400ccrwait(portp);
3720 stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
3721 portp->stats.rxxon++;
3722 stl_cd1400ccrwait(portp);
3723 } else {
3724 stl_cd1400ccrwait(portp);
3725 stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
3726 portp->stats.rxxoff++;
3727 stl_cd1400ccrwait(portp);
3728 }
3729 BRDDISABLE(portp->brdnr);
3730 spin_unlock_irqrestore(&brd_lock, flags);
3731 }
3732
3733 /*****************************************************************************/
3734
3735 static void stl_cd1400flush(stlport_t *portp)
3736 {
3737 unsigned long flags;
3738
3739 #ifdef DEBUG
3740 printk("stl_cd1400flush(portp=%x)\n", (int) portp);
3741 #endif
3742
3743 if (portp == (stlport_t *) NULL)
3744 return;
3745
3746 spin_lock_irqsave(&brd_lock, flags);
3747 BRDENABLE(portp->brdnr, portp->pagenr);
3748 stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
3749 stl_cd1400ccrwait(portp);
3750 stl_cd1400setreg(portp, CCR, CCR_TXFLUSHFIFO);
3751 stl_cd1400ccrwait(portp);
3752 portp->tx.tail = portp->tx.head;
3753 BRDDISABLE(portp->brdnr);
3754 spin_unlock_irqrestore(&brd_lock, flags);
3755 }
3756
3757 /*****************************************************************************/
3758
3759 /*
3760 * Return the current state of data flow on this port. This is only
3761 * really interresting when determining if data has fully completed
3762 * transmission or not... This is easy for the cd1400, it accurately
3763 * maintains the busy port flag.
3764 */
3765
3766 static int stl_cd1400datastate(stlport_t *portp)
3767 {
3768 #ifdef DEBUG
3769 printk("stl_cd1400datastate(portp=%x)\n", (int) portp);
3770 #endif
3771
3772 if (portp == (stlport_t *) NULL)
3773 return 0;
3774
3775 return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
3776 }
3777
3778 /*****************************************************************************/
3779
3780 /*
3781 * Interrupt service routine for cd1400 EasyIO boards.
3782 */
3783
3784 static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase)
3785 {
3786 unsigned char svrtype;
3787
3788 #ifdef DEBUG
3789 printk("stl_cd1400eiointr(panelp=%x,iobase=%x)\n",
3790 (int) panelp, iobase);
3791 #endif
3792
3793 spin_lock(&brd_lock);
3794 outb(SVRR, iobase);
3795 svrtype = inb(iobase + EREG_DATA);
3796 if (panelp->nrports > 4) {
3797 outb((SVRR + 0x80), iobase);
3798 svrtype |= inb(iobase + EREG_DATA);
3799 }
3800
3801 if (svrtype & SVRR_RX)
3802 stl_cd1400rxisr(panelp, iobase);
3803 else if (svrtype & SVRR_TX)
3804 stl_cd1400txisr(panelp, iobase);
3805 else if (svrtype & SVRR_MDM)
3806 stl_cd1400mdmisr(panelp, iobase);
3807
3808 spin_unlock(&brd_lock);
3809 }
3810
3811 /*****************************************************************************/
3812
3813 /*
3814 * Interrupt service routine for cd1400 panels.
3815 */
3816
3817 static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase)
3818 {
3819 unsigned char svrtype;
3820
3821 #ifdef DEBUG
3822 printk("stl_cd1400echintr(panelp=%x,iobase=%x)\n", (int) panelp,
3823 iobase);
3824 #endif
3825
3826 outb(SVRR, iobase);
3827 svrtype = inb(iobase + EREG_DATA);
3828 outb((SVRR + 0x80), iobase);
3829 svrtype |= inb(iobase + EREG_DATA);
3830 if (svrtype & SVRR_RX)
3831 stl_cd1400rxisr(panelp, iobase);
3832 else if (svrtype & SVRR_TX)
3833 stl_cd1400txisr(panelp, iobase);
3834 else if (svrtype & SVRR_MDM)
3835 stl_cd1400mdmisr(panelp, iobase);
3836 }
3837
3838
3839 /*****************************************************************************/
3840
3841 /*
3842 * Unfortunately we need to handle breaks in the TX data stream, since
3843 * this is the only way to generate them on the cd1400.
3844 */
3845
3846 static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr)
3847 {
3848 if (portp->brklen == 1) {
3849 outb((COR2 + portp->uartaddr), ioaddr);
3850 outb((inb(ioaddr + EREG_DATA) | COR2_ETC),
3851 (ioaddr + EREG_DATA));
3852 outb((TDR + portp->uartaddr), ioaddr);
3853 outb(ETC_CMD, (ioaddr + EREG_DATA));
3854 outb(ETC_STARTBREAK, (ioaddr + EREG_DATA));
3855 outb((SRER + portp->uartaddr), ioaddr);
3856 outb((inb(ioaddr + EREG_DATA) & ~(SRER_TXDATA | SRER_TXEMPTY)),
3857 (ioaddr + EREG_DATA));
3858 return 1;
3859 } else if (portp->brklen > 1) {
3860 outb((TDR + portp->uartaddr), ioaddr);
3861 outb(ETC_CMD, (ioaddr + EREG_DATA));
3862 outb(ETC_STOPBREAK, (ioaddr + EREG_DATA));
3863 portp->brklen = -1;
3864 return 1;
3865 } else {
3866 outb((COR2 + portp->uartaddr), ioaddr);
3867 outb((inb(ioaddr + EREG_DATA) & ~COR2_ETC),
3868 (ioaddr + EREG_DATA));
3869 portp->brklen = 0;
3870 }
3871 return 0;
3872 }
3873
3874 /*****************************************************************************/
3875
3876 /*
3877 * Transmit interrupt handler. This has gotta be fast! Handling TX
3878 * chars is pretty simple, stuff as many as possible from the TX buffer
3879 * into the cd1400 FIFO. Must also handle TX breaks here, since they
3880 * are embedded as commands in the data stream. Oh no, had to use a goto!
3881 * This could be optimized more, will do when I get time...
3882 * In practice it is possible that interrupts are enabled but that the
3883 * port has been hung up. Need to handle not having any TX buffer here,
3884 * this is done by using the side effect that head and tail will also
3885 * be NULL if the buffer has been freed.
3886 */
3887
3888 static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr)
3889 {
3890 stlport_t *portp;
3891 int len, stlen;
3892 char *head, *tail;
3893 unsigned char ioack, srer;
3894
3895 #ifdef DEBUG
3896 printk("stl_cd1400txisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
3897 #endif
3898
3899 ioack = inb(ioaddr + EREG_TXACK);
3900 if (((ioack & panelp->ackmask) != 0) ||
3901 ((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
3902 printk("STALLION: bad TX interrupt ack value=%x\n", ioack);
3903 return;
3904 }
3905 portp = panelp->ports[(ioack >> 3)];
3906
3907 /*
3908 * Unfortunately we need to handle breaks in the data stream, since
3909 * this is the only way to generate them on the cd1400. Do it now if
3910 * a break is to be sent.
3911 */
3912 if (portp->brklen != 0)
3913 if (stl_cd1400breakisr(portp, ioaddr))
3914 goto stl_txalldone;
3915
3916 head = portp->tx.head;
3917 tail = portp->tx.tail;
3918 len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
3919 if ((len == 0) || ((len < STL_TXBUFLOW) &&
3920 (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
3921 set_bit(ASYI_TXLOW, &portp->istate);
3922 schedule_work(&portp->tqueue);
3923 }
3924
3925 if (len == 0) {
3926 outb((SRER + portp->uartaddr), ioaddr);
3927 srer = inb(ioaddr + EREG_DATA);
3928 if (srer & SRER_TXDATA) {
3929 srer = (srer & ~SRER_TXDATA) | SRER_TXEMPTY;
3930 } else {
3931 srer &= ~(SRER_TXDATA | SRER_TXEMPTY);
3932 clear_bit(ASYI_TXBUSY, &portp->istate);
3933 }
3934 outb(srer, (ioaddr + EREG_DATA));
3935 } else {
3936 len = MIN(len, CD1400_TXFIFOSIZE);
3937 portp->stats.txtotal += len;
3938 stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
3939 outb((TDR + portp->uartaddr), ioaddr);
3940 outsb((ioaddr + EREG_DATA), tail, stlen);
3941 len -= stlen;
3942 tail += stlen;
3943 if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
3944 tail = portp->tx.buf;
3945 if (len > 0) {
3946 outsb((ioaddr + EREG_DATA), tail, len);
3947 tail += len;
3948 }
3949 portp->tx.tail = tail;
3950 }
3951
3952 stl_txalldone:
3953 outb((EOSRR + portp->uartaddr), ioaddr);
3954 outb(0, (ioaddr + EREG_DATA));
3955 }
3956
3957 /*****************************************************************************/
3958
3959 /*
3960 * Receive character interrupt handler. Determine if we have good chars
3961 * or bad chars and then process appropriately. Good chars are easy
3962 * just shove the lot into the RX buffer and set all status byte to 0.
3963 * If a bad RX char then process as required. This routine needs to be
3964 * fast! In practice it is possible that we get an interrupt on a port
3965 * that is closed. This can happen on hangups - since they completely
3966 * shutdown a port not in user context. Need to handle this case.
3967 */
3968
3969 static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr)
3970 {
3971 stlport_t *portp;
3972 struct tty_struct *tty;
3973 unsigned int ioack, len, buflen;
3974 unsigned char status;
3975 char ch;
3976
3977 #ifdef DEBUG
3978 printk("stl_cd1400rxisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
3979 #endif
3980
3981 ioack = inb(ioaddr + EREG_RXACK);
3982 if ((ioack & panelp->ackmask) != 0) {
3983 printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
3984 return;
3985 }
3986 portp = panelp->ports[(ioack >> 3)];
3987 tty = portp->tty;
3988
3989 if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
3990 outb((RDCR + portp->uartaddr), ioaddr);
3991 len = inb(ioaddr + EREG_DATA);
3992 if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
3993 len = MIN(len, sizeof(stl_unwanted));
3994 outb((RDSR + portp->uartaddr), ioaddr);
3995 insb((ioaddr + EREG_DATA), &stl_unwanted[0], len);
3996 portp->stats.rxlost += len;
3997 portp->stats.rxtotal += len;
3998 } else {
3999 len = MIN(len, buflen);
4000 if (len > 0) {
4001 unsigned char *ptr;
4002 outb((RDSR + portp->uartaddr), ioaddr);
4003 tty_prepare_flip_string(tty, &ptr, len);
4004 insb((ioaddr + EREG_DATA), ptr, len);
4005 tty_schedule_flip(tty);
4006 portp->stats.rxtotal += len;
4007 }
4008 }
4009 } else if ((ioack & ACK_TYPMASK) == ACK_TYPRXBAD) {
4010 outb((RDSR + portp->uartaddr), ioaddr);
4011 status = inb(ioaddr + EREG_DATA);
4012 ch = inb(ioaddr + EREG_DATA);
4013 if (status & ST_PARITY)
4014 portp->stats.rxparity++;
4015 if (status & ST_FRAMING)
4016 portp->stats.rxframing++;
4017 if (status & ST_OVERRUN)
4018 portp->stats.rxoverrun++;
4019 if (status & ST_BREAK)
4020 portp->stats.rxbreaks++;
4021 if (status & ST_SCHARMASK) {
4022 if ((status & ST_SCHARMASK) == ST_SCHAR1)
4023 portp->stats.txxon++;
4024 if ((status & ST_SCHARMASK) == ST_SCHAR2)
4025 portp->stats.txxoff++;
4026 goto stl_rxalldone;
4027 }
4028 if (tty != NULL && (portp->rxignoremsk & status) == 0) {
4029 if (portp->rxmarkmsk & status) {
4030 if (status & ST_BREAK) {
4031 status = TTY_BREAK;
4032 if (portp->flags & ASYNC_SAK) {
4033 do_SAK(tty);
4034 BRDENABLE(portp->brdnr, portp->pagenr);
4035 }
4036 } else if (status & ST_PARITY) {
4037 status = TTY_PARITY;
4038 } else if (status & ST_FRAMING) {
4039 status = TTY_FRAME;
4040 } else if(status & ST_OVERRUN) {
4041 status = TTY_OVERRUN;
4042 } else {
4043 status = 0;
4044 }
4045 } else {
4046 status = 0;
4047 }
4048 tty_insert_flip_char(tty, ch, status);
4049 tty_schedule_flip(tty);
4050 }
4051 } else {
4052 printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
4053 return;
4054 }
4055
4056 stl_rxalldone:
4057 outb((EOSRR + portp->uartaddr), ioaddr);
4058 outb(0, (ioaddr + EREG_DATA));
4059 }
4060
4061 /*****************************************************************************/
4062
4063 /*
4064 * Modem interrupt handler. The is called when the modem signal line
4065 * (DCD) has changed state. Leave most of the work to the off-level
4066 * processing routine.
4067 */
4068
4069 static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr)
4070 {
4071 stlport_t *portp;
4072 unsigned int ioack;
4073 unsigned char misr;
4074
4075 #ifdef DEBUG
4076 printk("stl_cd1400mdmisr(panelp=%x)\n", (int) panelp);
4077 #endif
4078
4079 ioack = inb(ioaddr + EREG_MDACK);
4080 if (((ioack & panelp->ackmask) != 0) ||
4081 ((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
4082 printk("STALLION: bad MODEM interrupt ack value=%x\n", ioack);
4083 return;
4084 }
4085 portp = panelp->ports[(ioack >> 3)];
4086
4087 outb((MISR + portp->uartaddr), ioaddr);
4088 misr = inb(ioaddr + EREG_DATA);
4089 if (misr & MISR_DCD) {
4090 set_bit(ASYI_DCDCHANGE, &portp->istate);
4091 schedule_work(&portp->tqueue);
4092 portp->stats.modem++;
4093 }
4094
4095 outb((EOSRR + portp->uartaddr), ioaddr);
4096 outb(0, (ioaddr + EREG_DATA));
4097 }
4098
4099 /*****************************************************************************/
4100 /* SC26198 HARDWARE FUNCTIONS */
4101 /*****************************************************************************/
4102
4103 /*
4104 * These functions get/set/update the registers of the sc26198 UARTs.
4105 * Access to the sc26198 registers is via an address/data io port pair.
4106 * (Maybe should make this inline...)
4107 */
4108
4109 static int stl_sc26198getreg(stlport_t *portp, int regnr)
4110 {
4111 outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
4112 return inb(portp->ioaddr + XP_DATA);
4113 }
4114
4115 static void stl_sc26198setreg(stlport_t *portp, int regnr, int value)
4116 {
4117 outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
4118 outb(value, (portp->ioaddr + XP_DATA));
4119 }
4120
4121 static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value)
4122 {
4123 outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
4124 if (inb(portp->ioaddr + XP_DATA) != value) {
4125 outb(value, (portp->ioaddr + XP_DATA));
4126 return 1;
4127 }
4128 return 0;
4129 }
4130
4131 /*****************************************************************************/
4132
4133 /*
4134 * Functions to get and set the sc26198 global registers.
4135 */
4136
4137 static int stl_sc26198getglobreg(stlport_t *portp, int regnr)
4138 {
4139 outb(regnr, (portp->ioaddr + XP_ADDR));
4140 return inb(portp->ioaddr + XP_DATA);
4141 }
4142
4143 #if 0
4144 static void stl_sc26198setglobreg(stlport_t *portp, int regnr, int value)
4145 {
4146 outb(regnr, (portp->ioaddr + XP_ADDR));
4147 outb(value, (portp->ioaddr + XP_DATA));
4148 }
4149 #endif
4150
4151 /*****************************************************************************/
4152
4153 /*
4154 * Inbitialize the UARTs in a panel. We don't care what sort of board
4155 * these ports are on - since the port io registers are almost
4156 * identical when dealing with ports.
4157 */
4158
4159 static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
4160 {
4161 int chipmask, i;
4162 int nrchips, ioaddr;
4163
4164 #ifdef DEBUG
4165 printk("stl_sc26198panelinit(brdp=%x,panelp=%x)\n",
4166 (int) brdp, (int) panelp);
4167 #endif
4168
4169 BRDENABLE(panelp->brdnr, panelp->pagenr);
4170
4171 /*
4172 * Check that each chip is present and started up OK.
4173 */
4174 chipmask = 0;
4175 nrchips = (panelp->nrports + 4) / SC26198_PORTS;
4176 if (brdp->brdtype == BRD_ECHPCI)
4177 outb(panelp->pagenr, brdp->ioctrl);
4178
4179 for (i = 0; (i < nrchips); i++) {
4180 ioaddr = panelp->iobase + (i * 4);
4181 outb(SCCR, (ioaddr + XP_ADDR));
4182 outb(CR_RESETALL, (ioaddr + XP_DATA));
4183 outb(TSTR, (ioaddr + XP_ADDR));
4184 if (inb(ioaddr + XP_DATA) != 0) {
4185 printk("STALLION: sc26198 not responding, "
4186 "brd=%d panel=%d chip=%d\n",
4187 panelp->brdnr, panelp->panelnr, i);
4188 continue;
4189 }
4190 chipmask |= (0x1 << i);
4191 outb(GCCR, (ioaddr + XP_ADDR));
4192 outb(GCCR_IVRTYPCHANACK, (ioaddr + XP_DATA));
4193 outb(WDTRCR, (ioaddr + XP_ADDR));
4194 outb(0xff, (ioaddr + XP_DATA));
4195 }
4196
4197 BRDDISABLE(panelp->brdnr);
4198 return chipmask;
4199 }
4200
4201 /*****************************************************************************/
4202
4203 /*
4204 * Initialize hardware specific port registers.
4205 */
4206
4207 static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
4208 {
4209 #ifdef DEBUG
4210 printk("stl_sc26198portinit(brdp=%x,panelp=%x,portp=%x)\n",
4211 (int) brdp, (int) panelp, (int) portp);
4212 #endif
4213
4214 if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
4215 (portp == (stlport_t *) NULL))
4216 return;
4217
4218 portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
4219 portp->uartaddr = (portp->portnr & 0x07) << 4;
4220 portp->pagenr = panelp->pagenr;
4221 portp->hwid = 0x1;
4222
4223 BRDENABLE(portp->brdnr, portp->pagenr);
4224 stl_sc26198setreg(portp, IOPCR, IOPCR_SETSIGS);
4225 BRDDISABLE(portp->brdnr);
4226 }
4227
4228 /*****************************************************************************/
4229
4230 /*
4231 * Set up the sc26198 registers for a port based on the termios port
4232 * settings.
4233 */
4234
4235 static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp)
4236 {
4237 stlbrd_t *brdp;
4238 unsigned long flags;
4239 unsigned int baudrate;
4240 unsigned char mr0, mr1, mr2, clk;
4241 unsigned char imron, imroff, iopr, ipr;
4242
4243 mr0 = 0;
4244 mr1 = 0;
4245 mr2 = 0;
4246 clk = 0;
4247 iopr = 0;
4248 imron = 0;
4249 imroff = 0;
4250
4251 brdp = stl_brds[portp->brdnr];
4252 if (brdp == (stlbrd_t *) NULL)
4253 return;
4254
4255 /*
4256 * Set up the RX char ignore mask with those RX error types we
4257 * can ignore.
4258 */
4259 portp->rxignoremsk = 0;
4260 if (tiosp->c_iflag & IGNPAR)
4261 portp->rxignoremsk |= (SR_RXPARITY | SR_RXFRAMING |
4262 SR_RXOVERRUN);
4263 if (tiosp->c_iflag & IGNBRK)
4264 portp->rxignoremsk |= SR_RXBREAK;
4265
4266 portp->rxmarkmsk = SR_RXOVERRUN;
4267 if (tiosp->c_iflag & (INPCK | PARMRK))
4268 portp->rxmarkmsk |= (SR_RXPARITY | SR_RXFRAMING);
4269 if (tiosp->c_iflag & BRKINT)
4270 portp->rxmarkmsk |= SR_RXBREAK;
4271
4272 /*
4273 * Go through the char size, parity and stop bits and set all the
4274 * option register appropriately.
4275 */
4276 switch (tiosp->c_cflag & CSIZE) {
4277 case CS5:
4278 mr1 |= MR1_CS5;
4279 break;
4280 case CS6:
4281 mr1 |= MR1_CS6;
4282 break;
4283 case CS7:
4284 mr1 |= MR1_CS7;
4285 break;
4286 default:
4287 mr1 |= MR1_CS8;
4288 break;
4289 }
4290
4291 if (tiosp->c_cflag & CSTOPB)
4292 mr2 |= MR2_STOP2;
4293 else
4294 mr2 |= MR2_STOP1;
4295
4296 if (tiosp->c_cflag & PARENB) {
4297 if (tiosp->c_cflag & PARODD)
4298 mr1 |= (MR1_PARENB | MR1_PARODD);
4299 else
4300 mr1 |= (MR1_PARENB | MR1_PAREVEN);
4301 } else {
4302 mr1 |= MR1_PARNONE;
4303 }
4304
4305 mr1 |= MR1_ERRBLOCK;
4306
4307 /*
4308 * Set the RX FIFO threshold at 8 chars. This gives a bit of breathing
4309 * space for hardware flow control and the like. This should be set to
4310 * VMIN.
4311 */
4312 mr2 |= MR2_RXFIFOHALF;
4313
4314 /*
4315 * Calculate the baud rate timers. For now we will just assume that
4316 * the input and output baud are the same. The sc26198 has a fixed
4317 * baud rate table, so only discrete baud rates possible.
4318 */
4319 baudrate = tiosp->c_cflag & CBAUD;
4320 if (baudrate & CBAUDEX) {
4321 baudrate &= ~CBAUDEX;
4322 if ((baudrate < 1) || (baudrate > 4))
4323 tiosp->c_cflag &= ~CBAUDEX;
4324 else
4325 baudrate += 15;
4326 }
4327 baudrate = stl_baudrates[baudrate];
4328 if ((tiosp->c_cflag & CBAUD) == B38400) {
4329 if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
4330 baudrate = 57600;
4331 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
4332 baudrate = 115200;
4333 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
4334 baudrate = 230400;
4335 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
4336 baudrate = 460800;
4337 else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
4338 baudrate = (portp->baud_base / portp->custom_divisor);
4339 }
4340 if (baudrate > STL_SC26198MAXBAUD)
4341 baudrate = STL_SC26198MAXBAUD;
4342
4343 if (baudrate > 0) {
4344 for (clk = 0; (clk < SC26198_NRBAUDS); clk++) {
4345 if (baudrate <= sc26198_baudtable[clk])
4346 break;
4347 }
4348 }
4349
4350 /*
4351 * Check what form of modem signaling is required and set it up.
4352 */
4353 if (tiosp->c_cflag & CLOCAL) {
4354 portp->flags &= ~ASYNC_CHECK_CD;
4355 } else {
4356 iopr |= IOPR_DCDCOS;
4357 imron |= IR_IOPORT;
4358 portp->flags |= ASYNC_CHECK_CD;
4359 }
4360
4361 /*
4362 * Setup sc26198 enhanced modes if we can. In particular we want to
4363 * handle as much of the flow control as possible automatically. As
4364 * well as saving a few CPU cycles it will also greatly improve flow
4365 * control reliability.
4366 */
4367 if (tiosp->c_iflag & IXON) {
4368 mr0 |= MR0_SWFTX | MR0_SWFT;
4369 imron |= IR_XONXOFF;
4370 } else {
4371 imroff |= IR_XONXOFF;
4372 }
4373 if (tiosp->c_iflag & IXOFF)
4374 mr0 |= MR0_SWFRX;
4375
4376 if (tiosp->c_cflag & CRTSCTS) {
4377 mr2 |= MR2_AUTOCTS;
4378 mr1 |= MR1_AUTORTS;
4379 }
4380
4381 /*
4382 * All sc26198 register values calculated so go through and set
4383 * them all up.
4384 */
4385
4386 #ifdef DEBUG
4387 printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
4388 portp->portnr, portp->panelnr, portp->brdnr);
4389 printk(" mr0=%x mr1=%x mr2=%x clk=%x\n", mr0, mr1, mr2, clk);
4390 printk(" iopr=%x imron=%x imroff=%x\n", iopr, imron, imroff);
4391 printk(" schr1=%x schr2=%x schr3=%x schr4=%x\n",
4392 tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
4393 tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
4394 #endif
4395
4396 spin_lock_irqsave(&brd_lock, flags);
4397 BRDENABLE(portp->brdnr, portp->pagenr);
4398 stl_sc26198setreg(portp, IMR, 0);
4399 stl_sc26198updatereg(portp, MR0, mr0);
4400 stl_sc26198updatereg(portp, MR1, mr1);
4401 stl_sc26198setreg(portp, SCCR, CR_RXERRBLOCK);
4402 stl_sc26198updatereg(portp, MR2, mr2);
4403 stl_sc26198updatereg(portp, IOPIOR,
4404 ((stl_sc26198getreg(portp, IOPIOR) & ~IPR_CHANGEMASK) | iopr));
4405
4406 if (baudrate > 0) {
4407 stl_sc26198setreg(portp, TXCSR, clk);
4408 stl_sc26198setreg(portp, RXCSR, clk);
4409 }
4410
4411 stl_sc26198setreg(portp, XONCR, tiosp->c_cc[VSTART]);
4412 stl_sc26198setreg(portp, XOFFCR, tiosp->c_cc[VSTOP]);
4413
4414 ipr = stl_sc26198getreg(portp, IPR);
4415 if (ipr & IPR_DCD)
4416 portp->sigs &= ~TIOCM_CD;
4417 else
4418 portp->sigs |= TIOCM_CD;
4419
4420 portp->imr = (portp->imr & ~imroff) | imron;
4421 stl_sc26198setreg(portp, IMR, portp->imr);
4422 BRDDISABLE(portp->brdnr);
4423 spin_unlock_irqrestore(&brd_lock, flags);
4424 }
4425
4426 /*****************************************************************************/
4427
4428 /*
4429 * Set the state of the DTR and RTS signals.
4430 */
4431
4432 static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts)
4433 {
4434 unsigned char iopioron, iopioroff;
4435 unsigned long flags;
4436
4437 #ifdef DEBUG
4438 printk("stl_sc26198setsignals(portp=%x,dtr=%d,rts=%d)\n",
4439 (int) portp, dtr, rts);
4440 #endif
4441
4442 iopioron = 0;
4443 iopioroff = 0;
4444 if (dtr == 0)
4445 iopioroff |= IPR_DTR;
4446 else if (dtr > 0)
4447 iopioron |= IPR_DTR;
4448 if (rts == 0)
4449 iopioroff |= IPR_RTS;
4450 else if (rts > 0)
4451 iopioron |= IPR_RTS;
4452
4453 spin_lock_irqsave(&brd_lock, flags);
4454 BRDENABLE(portp->brdnr, portp->pagenr);
4455 stl_sc26198setreg(portp, IOPIOR,
4456 ((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
4457 BRDDISABLE(portp->brdnr);
4458 spin_unlock_irqrestore(&brd_lock, flags);
4459 }
4460
4461 /*****************************************************************************/
4462
4463 /*
4464 * Return the state of the signals.
4465 */
4466
4467 static int stl_sc26198getsignals(stlport_t *portp)
4468 {
4469 unsigned char ipr;
4470 unsigned long flags;
4471 int sigs;
4472
4473 #ifdef DEBUG
4474 printk("stl_sc26198getsignals(portp=%x)\n", (int) portp);
4475 #endif
4476
4477 spin_lock_irqsave(&brd_lock, flags);
4478 BRDENABLE(portp->brdnr, portp->pagenr);
4479 ipr = stl_sc26198getreg(portp, IPR);
4480 BRDDISABLE(portp->brdnr);
4481 spin_unlock_irqrestore(&brd_lock, flags);
4482
4483 sigs = 0;
4484 sigs |= (ipr & IPR_DCD) ? 0 : TIOCM_CD;
4485 sigs |= (ipr & IPR_CTS) ? 0 : TIOCM_CTS;
4486 sigs |= (ipr & IPR_DTR) ? 0: TIOCM_DTR;
4487 sigs |= (ipr & IPR_RTS) ? 0: TIOCM_RTS;
4488 sigs |= TIOCM_DSR;
4489 return sigs;
4490 }
4491
4492 /*****************************************************************************/
4493
4494 /*
4495 * Enable/Disable the Transmitter and/or Receiver.
4496 */
4497
4498 static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx)
4499 {
4500 unsigned char ccr;
4501 unsigned long flags;
4502
4503 #ifdef DEBUG
4504 printk("stl_sc26198enablerxtx(portp=%x,rx=%d,tx=%d)\n",
4505 (int) portp, rx, tx);
4506 #endif
4507
4508 ccr = portp->crenable;
4509 if (tx == 0)
4510 ccr &= ~CR_TXENABLE;
4511 else if (tx > 0)
4512 ccr |= CR_TXENABLE;
4513 if (rx == 0)
4514 ccr &= ~CR_RXENABLE;
4515 else if (rx > 0)
4516 ccr |= CR_RXENABLE;
4517
4518 spin_lock_irqsave(&brd_lock, flags);
4519 BRDENABLE(portp->brdnr, portp->pagenr);
4520 stl_sc26198setreg(portp, SCCR, ccr);
4521 BRDDISABLE(portp->brdnr);
4522 portp->crenable = ccr;
4523 spin_unlock_irqrestore(&brd_lock, flags);
4524 }
4525
4526 /*****************************************************************************/
4527
4528 /*
4529 * Start/stop the Transmitter and/or Receiver.
4530 */
4531
4532 static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx)
4533 {
4534 unsigned char imr;
4535 unsigned long flags;
4536
4537 #ifdef DEBUG
4538 printk("stl_sc26198startrxtx(portp=%x,rx=%d,tx=%d)\n",
4539 (int) portp, rx, tx);
4540 #endif
4541
4542 imr = portp->imr;
4543 if (tx == 0)
4544 imr &= ~IR_TXRDY;
4545 else if (tx == 1)
4546 imr |= IR_TXRDY;
4547 if (rx == 0)
4548 imr &= ~(IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG);
4549 else if (rx > 0)
4550 imr |= IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG;
4551
4552 spin_lock_irqsave(&brd_lock, flags);
4553 BRDENABLE(portp->brdnr, portp->pagenr);
4554 stl_sc26198setreg(portp, IMR, imr);
4555 BRDDISABLE(portp->brdnr);
4556 portp->imr = imr;
4557 if (tx > 0)
4558 set_bit(ASYI_TXBUSY, &portp->istate);
4559 spin_unlock_irqrestore(&brd_lock, flags);
4560 }
4561
4562 /*****************************************************************************/
4563
4564 /*
4565 * Disable all interrupts from this port.
4566 */
4567
4568 static void stl_sc26198disableintrs(stlport_t *portp)
4569 {
4570 unsigned long flags;
4571
4572 #ifdef DEBUG
4573 printk("stl_sc26198disableintrs(portp=%x)\n", (int) portp);
4574 #endif
4575
4576 spin_lock_irqsave(&brd_lock, flags);
4577 BRDENABLE(portp->brdnr, portp->pagenr);
4578 portp->imr = 0;
4579 stl_sc26198setreg(portp, IMR, 0);
4580 BRDDISABLE(portp->brdnr);
4581 spin_unlock_irqrestore(&brd_lock, flags);
4582 }
4583
4584 /*****************************************************************************/
4585
4586 static void stl_sc26198sendbreak(stlport_t *portp, int len)
4587 {
4588 unsigned long flags;
4589
4590 #ifdef DEBUG
4591 printk("stl_sc26198sendbreak(portp=%x,len=%d)\n", (int) portp, len);
4592 #endif
4593
4594 spin_lock_irqsave(&brd_lock, flags);
4595 BRDENABLE(portp->brdnr, portp->pagenr);
4596 if (len == 1) {
4597 stl_sc26198setreg(portp, SCCR, CR_TXSTARTBREAK);
4598 portp->stats.txbreaks++;
4599 } else {
4600 stl_sc26198setreg(portp, SCCR, CR_TXSTOPBREAK);
4601 }
4602 BRDDISABLE(portp->brdnr);
4603 spin_unlock_irqrestore(&brd_lock, flags);
4604 }
4605
4606 /*****************************************************************************/
4607
4608 /*
4609 * Take flow control actions...
4610 */
4611
4612 static void stl_sc26198flowctrl(stlport_t *portp, int state)
4613 {
4614 struct tty_struct *tty;
4615 unsigned long flags;
4616 unsigned char mr0;
4617
4618 #ifdef DEBUG
4619 printk("stl_sc26198flowctrl(portp=%x,state=%x)\n", (int) portp, state);
4620 #endif
4621
4622 if (portp == (stlport_t *) NULL)
4623 return;
4624 tty = portp->tty;
4625 if (tty == (struct tty_struct *) NULL)
4626 return;
4627
4628 spin_lock_irqsave(&brd_lock, flags);
4629 BRDENABLE(portp->brdnr, portp->pagenr);
4630
4631 if (state) {
4632 if (tty->termios->c_iflag & IXOFF) {
4633 mr0 = stl_sc26198getreg(portp, MR0);
4634 stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
4635 stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
4636 mr0 |= MR0_SWFRX;
4637 portp->stats.rxxon++;
4638 stl_sc26198wait(portp);
4639 stl_sc26198setreg(portp, MR0, mr0);
4640 }
4641 /*
4642 * Question: should we return RTS to what it was before? It may
4643 * have been set by an ioctl... Suppose not, since if you have
4644 * hardware flow control set then it is pretty silly to go and
4645 * set the RTS line by hand.
4646 */
4647 if (tty->termios->c_cflag & CRTSCTS) {
4648 stl_sc26198setreg(portp, MR1,
4649 (stl_sc26198getreg(portp, MR1) | MR1_AUTORTS));
4650 stl_sc26198setreg(portp, IOPIOR,
4651 (stl_sc26198getreg(portp, IOPIOR) | IOPR_RTS));
4652 portp->stats.rxrtson++;
4653 }
4654 } else {
4655 if (tty->termios->c_iflag & IXOFF) {
4656 mr0 = stl_sc26198getreg(portp, MR0);
4657 stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
4658 stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
4659 mr0 &= ~MR0_SWFRX;
4660 portp->stats.rxxoff++;
4661 stl_sc26198wait(portp);
4662 stl_sc26198setreg(portp, MR0, mr0);
4663 }
4664 if (tty->termios->c_cflag & CRTSCTS) {
4665 stl_sc26198setreg(portp, MR1,
4666 (stl_sc26198getreg(portp, MR1) & ~MR1_AUTORTS));
4667 stl_sc26198setreg(portp, IOPIOR,
4668 (stl_sc26198getreg(portp, IOPIOR) & ~IOPR_RTS));
4669 portp->stats.rxrtsoff++;
4670 }
4671 }
4672
4673 BRDDISABLE(portp->brdnr);
4674 spin_unlock_irqrestore(&brd_lock, flags);
4675 }
4676
4677 /*****************************************************************************/
4678
4679 /*
4680 * Send a flow control character.
4681 */
4682
4683 static void stl_sc26198sendflow(stlport_t *portp, int state)
4684 {
4685 struct tty_struct *tty;
4686 unsigned long flags;
4687 unsigned char mr0;
4688
4689 #ifdef DEBUG
4690 printk("stl_sc26198sendflow(portp=%x,state=%x)\n", (int) portp, state);
4691 #endif
4692
4693 if (portp == (stlport_t *) NULL)
4694 return;
4695 tty = portp->tty;
4696 if (tty == (struct tty_struct *) NULL)
4697 return;
4698
4699 spin_lock_irqsave(&brd_lock, flags);
4700 BRDENABLE(portp->brdnr, portp->pagenr);
4701 if (state) {
4702 mr0 = stl_sc26198getreg(portp, MR0);
4703 stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
4704 stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
4705 mr0 |= MR0_SWFRX;
4706 portp->stats.rxxon++;
4707 stl_sc26198wait(portp);
4708 stl_sc26198setreg(portp, MR0, mr0);
4709 } else {
4710 mr0 = stl_sc26198getreg(portp, MR0);
4711 stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
4712 stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
4713 mr0 &= ~MR0_SWFRX;
4714 portp->stats.rxxoff++;
4715 stl_sc26198wait(portp);
4716 stl_sc26198setreg(portp, MR0, mr0);
4717 }
4718 BRDDISABLE(portp->brdnr);
4719 spin_unlock_irqrestore(&brd_lock, flags);
4720 }
4721
4722 /*****************************************************************************/
4723
4724 static void stl_sc26198flush(stlport_t *portp)
4725 {
4726 unsigned long flags;
4727
4728 #ifdef DEBUG
4729 printk("stl_sc26198flush(portp=%x)\n", (int) portp);
4730 #endif
4731
4732 if (portp == (stlport_t *) NULL)
4733 return;
4734
4735 spin_lock_irqsave(&brd_lock, flags);
4736 BRDENABLE(portp->brdnr, portp->pagenr);
4737 stl_sc26198setreg(portp, SCCR, CR_TXRESET);
4738 stl_sc26198setreg(portp, SCCR, portp->crenable);
4739 BRDDISABLE(portp->brdnr);
4740 portp->tx.tail = portp->tx.head;
4741 spin_unlock_irqrestore(&brd_lock, flags);
4742 }
4743
4744 /*****************************************************************************/
4745
4746 /*
4747 * Return the current state of data flow on this port. This is only
4748 * really interresting when determining if data has fully completed
4749 * transmission or not... The sc26198 interrupt scheme cannot
4750 * determine when all data has actually drained, so we need to
4751 * check the port statusy register to be sure.
4752 */
4753
4754 static int stl_sc26198datastate(stlport_t *portp)
4755 {
4756 unsigned long flags;
4757 unsigned char sr;
4758
4759 #ifdef DEBUG
4760 printk("stl_sc26198datastate(portp=%x)\n", (int) portp);
4761 #endif
4762
4763 if (portp == (stlport_t *) NULL)
4764 return 0;
4765 if (test_bit(ASYI_TXBUSY, &portp->istate))
4766 return 1;
4767
4768 spin_lock_irqsave(&brd_lock, flags);
4769 BRDENABLE(portp->brdnr, portp->pagenr);
4770 sr = stl_sc26198getreg(portp, SR);
4771 BRDDISABLE(portp->brdnr);
4772 spin_unlock_irqrestore(&brd_lock, flags);
4773
4774 return (sr & SR_TXEMPTY) ? 0 : 1;
4775 }
4776
4777 /*****************************************************************************/
4778
4779 /*
4780 * Delay for a small amount of time, to give the sc26198 a chance
4781 * to process a command...
4782 */
4783
4784 static void stl_sc26198wait(stlport_t *portp)
4785 {
4786 int i;
4787
4788 #ifdef DEBUG
4789 printk("stl_sc26198wait(portp=%x)\n", (int) portp);
4790 #endif
4791
4792 if (portp == (stlport_t *) NULL)
4793 return;
4794
4795 for (i = 0; (i < 20); i++)
4796 stl_sc26198getglobreg(portp, TSTR);
4797 }
4798
4799 /*****************************************************************************/
4800
4801 /*
4802 * If we are TX flow controlled and in IXANY mode then we may
4803 * need to unflow control here. We gotta do this because of the
4804 * automatic flow control modes of the sc26198.
4805 */
4806
4807 static inline void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty)
4808 {
4809 unsigned char mr0;
4810
4811 mr0 = stl_sc26198getreg(portp, MR0);
4812 stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
4813 stl_sc26198setreg(portp, SCCR, CR_HOSTXON);
4814 stl_sc26198wait(portp);
4815 stl_sc26198setreg(portp, MR0, mr0);
4816 clear_bit(ASYI_TXFLOWED, &portp->istate);
4817 }
4818
4819 /*****************************************************************************/
4820
4821 /*
4822 * Interrupt service routine for sc26198 panels.
4823 */
4824
4825 static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase)
4826 {
4827 stlport_t *portp;
4828 unsigned int iack;
4829
4830 spin_lock(&brd_lock);
4831
4832 /*
4833 * Work around bug in sc26198 chip... Cannot have A6 address
4834 * line of UART high, else iack will be returned as 0.
4835 */
4836 outb(0, (iobase + 1));
4837
4838 iack = inb(iobase + XP_IACK);
4839 portp = panelp->ports[(iack & IVR_CHANMASK) + ((iobase & 0x4) << 1)];
4840
4841 if (iack & IVR_RXDATA)
4842 stl_sc26198rxisr(portp, iack);
4843 else if (iack & IVR_TXDATA)
4844 stl_sc26198txisr(portp);
4845 else
4846 stl_sc26198otherisr(portp, iack);
4847
4848 spin_unlock(&brd_lock);
4849 }
4850
4851 /*****************************************************************************/
4852
4853 /*
4854 * Transmit interrupt handler. This has gotta be fast! Handling TX
4855 * chars is pretty simple, stuff as many as possible from the TX buffer
4856 * into the sc26198 FIFO.
4857 * In practice it is possible that interrupts are enabled but that the
4858 * port has been hung up. Need to handle not having any TX buffer here,
4859 * this is done by using the side effect that head and tail will also
4860 * be NULL if the buffer has been freed.
4861 */
4862
4863 static void stl_sc26198txisr(stlport_t *portp)
4864 {
4865 unsigned int ioaddr;
4866 unsigned char mr0;
4867 int len, stlen;
4868 char *head, *tail;
4869
4870 #ifdef DEBUG
4871 printk("stl_sc26198txisr(portp=%x)\n", (int) portp);
4872 #endif
4873
4874 ioaddr = portp->ioaddr;
4875 head = portp->tx.head;
4876 tail = portp->tx.tail;
4877 len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
4878 if ((len == 0) || ((len < STL_TXBUFLOW) &&
4879 (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
4880 set_bit(ASYI_TXLOW, &portp->istate);
4881 schedule_work(&portp->tqueue);
4882 }
4883
4884 if (len == 0) {
4885 outb((MR0 | portp->uartaddr), (ioaddr + XP_ADDR));
4886 mr0 = inb(ioaddr + XP_DATA);
4887 if ((mr0 & MR0_TXMASK) == MR0_TXEMPTY) {
4888 portp->imr &= ~IR_TXRDY;
4889 outb((IMR | portp->uartaddr), (ioaddr + XP_ADDR));
4890 outb(portp->imr, (ioaddr + XP_DATA));
4891 clear_bit(ASYI_TXBUSY, &portp->istate);
4892 } else {
4893 mr0 |= ((mr0 & ~MR0_TXMASK) | MR0_TXEMPTY);
4894 outb(mr0, (ioaddr + XP_DATA));
4895 }
4896 } else {
4897 len = MIN(len, SC26198_TXFIFOSIZE);
4898 portp->stats.txtotal += len;
4899 stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
4900 outb(GTXFIFO, (ioaddr + XP_ADDR));
4901 outsb((ioaddr + XP_DATA), tail, stlen);
4902 len -= stlen;
4903 tail += stlen;
4904 if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
4905 tail = portp->tx.buf;
4906 if (len > 0) {
4907 outsb((ioaddr + XP_DATA), tail, len);
4908 tail += len;
4909 }
4910 portp->tx.tail = tail;
4911 }
4912 }
4913
4914 /*****************************************************************************/
4915
4916 /*
4917 * Receive character interrupt handler. Determine if we have good chars
4918 * or bad chars and then process appropriately. Good chars are easy
4919 * just shove the lot into the RX buffer and set all status byte to 0.
4920 * If a bad RX char then process as required. This routine needs to be
4921 * fast! In practice it is possible that we get an interrupt on a port
4922 * that is closed. This can happen on hangups - since they completely
4923 * shutdown a port not in user context. Need to handle this case.
4924 */
4925
4926 static void stl_sc26198rxisr(stlport_t *portp, unsigned int iack)
4927 {
4928 struct tty_struct *tty;
4929 unsigned int len, buflen, ioaddr;
4930
4931 #ifdef DEBUG
4932 printk("stl_sc26198rxisr(portp=%x,iack=%x)\n", (int) portp, iack);
4933 #endif
4934
4935 tty = portp->tty;
4936 ioaddr = portp->ioaddr;
4937 outb(GIBCR, (ioaddr + XP_ADDR));
4938 len = inb(ioaddr + XP_DATA) + 1;
4939
4940 if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
4941 if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
4942 len = MIN(len, sizeof(stl_unwanted));
4943 outb(GRXFIFO, (ioaddr + XP_ADDR));
4944 insb((ioaddr + XP_DATA), &stl_unwanted[0], len);
4945 portp->stats.rxlost += len;
4946 portp->stats.rxtotal += len;
4947 } else {
4948 len = MIN(len, buflen);
4949 if (len > 0) {
4950 unsigned char *ptr;
4951 outb(GRXFIFO, (ioaddr + XP_ADDR));
4952 tty_prepare_flip_string(tty, &ptr, len);
4953 insb((ioaddr + XP_DATA), ptr, len);
4954 tty_schedule_flip(tty);
4955 portp->stats.rxtotal += len;
4956 }
4957 }
4958 } else {
4959 stl_sc26198rxbadchars(portp);
4960 }
4961
4962 /*
4963 * If we are TX flow controlled and in IXANY mode then we may need
4964 * to unflow control here. We gotta do this because of the automatic
4965 * flow control modes of the sc26198.
4966 */
4967 if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
4968 if ((tty != (struct tty_struct *) NULL) &&
4969 (tty->termios != (struct termios *) NULL) &&
4970 (tty->termios->c_iflag & IXANY)) {
4971 stl_sc26198txunflow(portp, tty);
4972 }
4973 }
4974 }
4975
4976 /*****************************************************************************/
4977
4978 /*
4979 * Process an RX bad character.
4980 */
4981
4982 static inline void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch)
4983 {
4984 struct tty_struct *tty;
4985 unsigned int ioaddr;
4986
4987 tty = portp->tty;
4988 ioaddr = portp->ioaddr;
4989
4990 if (status & SR_RXPARITY)
4991 portp->stats.rxparity++;
4992 if (status & SR_RXFRAMING)
4993 portp->stats.rxframing++;
4994 if (status & SR_RXOVERRUN)
4995 portp->stats.rxoverrun++;
4996 if (status & SR_RXBREAK)
4997 portp->stats.rxbreaks++;
4998
4999 if ((tty != (struct tty_struct *) NULL) &&
5000 ((portp->rxignoremsk & status) == 0)) {
5001 if (portp->rxmarkmsk & status) {
5002 if (status & SR_RXBREAK) {
5003 status = TTY_BREAK;
5004 if (portp->flags & ASYNC_SAK) {
5005 do_SAK(tty);
5006 BRDENABLE(portp->brdnr, portp->pagenr);
5007 }
5008 } else if (status & SR_RXPARITY) {
5009 status = TTY_PARITY;
5010 } else if (status & SR_RXFRAMING) {
5011 status = TTY_FRAME;
5012 } else if(status & SR_RXOVERRUN) {
5013 status = TTY_OVERRUN;
5014 } else {
5015 status = 0;
5016 }
5017 } else {
5018 status = 0;
5019 }
5020
5021 tty_insert_flip_char(tty, ch, status);
5022 tty_schedule_flip(tty);
5023
5024 if (status == 0)
5025 portp->stats.rxtotal++;
5026 }
5027 }
5028
5029 /*****************************************************************************/
5030
5031 /*
5032 * Process all characters in the RX FIFO of the UART. Check all char
5033 * status bytes as well, and process as required. We need to check
5034 * all bytes in the FIFO, in case some more enter the FIFO while we
5035 * are here. To get the exact character error type we need to switch
5036 * into CHAR error mode (that is why we need to make sure we empty
5037 * the FIFO).
5038 */
5039
5040 static void stl_sc26198rxbadchars(stlport_t *portp)
5041 {
5042 unsigned char status, mr1;
5043 char ch;
5044
5045 /*
5046 * To get the precise error type for each character we must switch
5047 * back into CHAR error mode.
5048 */
5049 mr1 = stl_sc26198getreg(portp, MR1);
5050 stl_sc26198setreg(portp, MR1, (mr1 & ~MR1_ERRBLOCK));
5051
5052 while ((status = stl_sc26198getreg(portp, SR)) & SR_RXRDY) {
5053 stl_sc26198setreg(portp, SCCR, CR_CLEARRXERR);
5054 ch = stl_sc26198getreg(portp, RXFIFO);
5055 stl_sc26198rxbadch(portp, status, ch);
5056 }
5057
5058 /*
5059 * To get correct interrupt class we must switch back into BLOCK
5060 * error mode.
5061 */
5062 stl_sc26198setreg(portp, MR1, mr1);
5063 }
5064
5065 /*****************************************************************************/
5066
5067 /*
5068 * Other interrupt handler. This includes modem signals, flow
5069 * control actions, etc. Most stuff is left to off-level interrupt
5070 * processing time.
5071 */
5072
5073 static void stl_sc26198otherisr(stlport_t *portp, unsigned int iack)
5074 {
5075 unsigned char cir, ipr, xisr;
5076
5077 #ifdef DEBUG
5078 printk("stl_sc26198otherisr(portp=%x,iack=%x)\n", (int) portp, iack);
5079 #endif
5080
5081 cir = stl_sc26198getglobreg(portp, CIR);
5082
5083 switch (cir & CIR_SUBTYPEMASK) {
5084 case CIR_SUBCOS:
5085 ipr = stl_sc26198getreg(portp, IPR);
5086 if (ipr & IPR_DCDCHANGE) {
5087 set_bit(ASYI_DCDCHANGE, &portp->istate);
5088 schedule_work(&portp->tqueue);
5089 portp->stats.modem++;
5090 }
5091 break;
5092 case CIR_SUBXONXOFF:
5093 xisr = stl_sc26198getreg(portp, XISR);
5094 if (xisr & XISR_RXXONGOT) {
5095 set_bit(ASYI_TXFLOWED, &portp->istate);
5096 portp->stats.txxoff++;
5097 }
5098 if (xisr & XISR_RXXOFFGOT) {
5099 clear_bit(ASYI_TXFLOWED, &portp->istate);
5100 portp->stats.txxon++;
5101 }
5102 break;
5103 case CIR_SUBBREAK:
5104 stl_sc26198setreg(portp, SCCR, CR_BREAKRESET);
5105 stl_sc26198rxbadchars(portp);
5106 break;
5107 default:
5108 break;
5109 }
5110 }
5111
5112 /*****************************************************************************/
linux v2.6.22.y-op