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i915: fix AR register restore.
[linux-2.6/mini2440.git] / drivers / char / vme_scc.c
blobe122a0e87bb0b8a53984262ae29bc5d0d3e34e63
1 /*
2 * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
3 * implementation.
4 * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
5 *
6 * Based on atari_SCC.c which was
7 * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
8 * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive
12 * for more details.
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/kdev_t.h>
18 #include <asm/io.h>
19 #include <linux/kernel.h>
20 #include <linux/ioport.h>
21 #include <linux/interrupt.h>
22 #include <linux/errno.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/mm.h>
26 #include <linux/serial.h>
27 #include <linux/fcntl.h>
28 #include <linux/major.h>
29 #include <linux/delay.h>
30 #include <linux/slab.h>
31 #include <linux/miscdevice.h>
32 #include <linux/console.h>
33 #include <linux/init.h>
34 #include <asm/setup.h>
35 #include <asm/bootinfo.h>
36
37 #ifdef CONFIG_MVME147_SCC
38 #include <asm/mvme147hw.h>
39 #endif
40 #ifdef CONFIG_MVME162_SCC
41 #include <asm/mvme16xhw.h>
42 #endif
43 #ifdef CONFIG_BVME6000_SCC
44 #include <asm/bvme6000hw.h>
45 #endif
46
47 #include <linux/generic_serial.h>
48 #include "scc.h"
49
50
51 #define CHANNEL_A 0
52 #define CHANNEL_B 1
53
54 #define SCC_MINOR_BASE 64
55
56 /* Shadows for all SCC write registers */
57 static unsigned char scc_shadow[2][16];
58
59 /* Location to access for SCC register access delay */
60 static volatile unsigned char *scc_del = NULL;
61
62 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
63 static unsigned char scc_last_status_reg[2];
64
65 /***************************** Prototypes *****************************/
66
67 /* Function prototypes */
68 static void scc_disable_tx_interrupts(void * ptr);
69 static void scc_enable_tx_interrupts(void * ptr);
70 static void scc_disable_rx_interrupts(void * ptr);
71 static void scc_enable_rx_interrupts(void * ptr);
72 static int scc_get_CD(void * ptr);
73 static void scc_shutdown_port(void * ptr);
74 static int scc_set_real_termios(void *ptr);
75 static void scc_hungup(void *ptr);
76 static void scc_close(void *ptr);
77 static int scc_chars_in_buffer(void * ptr);
78 static int scc_open(struct tty_struct * tty, struct file * filp);
79 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
80 unsigned int cmd, unsigned long arg);
81 static void scc_throttle(struct tty_struct *tty);
82 static void scc_unthrottle(struct tty_struct *tty);
83 static irqreturn_t scc_tx_int(int irq, void *data);
84 static irqreturn_t scc_rx_int(int irq, void *data);
85 static irqreturn_t scc_stat_int(int irq, void *data);
86 static irqreturn_t scc_spcond_int(int irq, void *data);
87 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
88 static void scc_break_ctl(struct tty_struct *tty, int break_state);
89
90 static struct tty_driver *scc_driver;
91
92 struct scc_port scc_ports[2];
93
94 int scc_initialized = 0;
95
96 /*---------------------------------------------------------------------------
97 * Interface from generic_serial.c back here
98 *--------------------------------------------------------------------------*/
99
100 static struct real_driver scc_real_driver = {
101 scc_disable_tx_interrupts,
102 scc_enable_tx_interrupts,
103 scc_disable_rx_interrupts,
104 scc_enable_rx_interrupts,
105 scc_get_CD,
106 scc_shutdown_port,
107 scc_set_real_termios,
108 scc_chars_in_buffer,
109 scc_close,
110 scc_hungup,
111 NULL
112 };
113
114
115 static const struct tty_operations scc_ops = {
116 .open = scc_open,
117 .close = gs_close,
118 .write = gs_write,
119 .put_char = gs_put_char,
120 .flush_chars = gs_flush_chars,
121 .write_room = gs_write_room,
122 .chars_in_buffer = gs_chars_in_buffer,
123 .flush_buffer = gs_flush_buffer,
124 .ioctl = scc_ioctl,
125 .throttle = scc_throttle,
126 .unthrottle = scc_unthrottle,
127 .set_termios = gs_set_termios,
128 .stop = gs_stop,
129 .start = gs_start,
130 .hangup = gs_hangup,
131 .break_ctl = scc_break_ctl,
132 };
133
134 /*----------------------------------------------------------------------------
135 * vme_scc_init() and support functions
136 *---------------------------------------------------------------------------*/
137
138 static int scc_init_drivers(void)
139 {
140 int error;
141
142 scc_driver = alloc_tty_driver(2);
143 if (!scc_driver)
144 return -ENOMEM;
145 scc_driver->owner = THIS_MODULE;
146 scc_driver->driver_name = "scc";
147 scc_driver->name = "ttyS";
148 scc_driver->major = TTY_MAJOR;
149 scc_driver->minor_start = SCC_MINOR_BASE;
150 scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
151 scc_driver->subtype = SERIAL_TYPE_NORMAL;
152 scc_driver->init_termios = tty_std_termios;
153 scc_driver->init_termios.c_cflag =
154 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
155 scc_driver->init_termios.c_ispeed = 9600;
156 scc_driver->init_termios.c_ospeed = 9600;
157 scc_driver->flags = TTY_DRIVER_REAL_RAW;
158 tty_set_operations(scc_driver, &scc_ops);
159
160 if ((error = tty_register_driver(scc_driver))) {
161 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
162 error);
163 put_tty_driver(scc_driver);
164 return 1;
165 }
166
167 return 0;
168 }
169
170
171 /* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
172 */
173
174 static void scc_init_portstructs(void)
175 {
176 struct scc_port *port;
177 int i;
178
179 for (i = 0; i < 2; i++) {
180 port = scc_ports + i;
181 port->gs.magic = SCC_MAGIC;
182 port->gs.close_delay = HZ/2;
183 port->gs.closing_wait = 30 * HZ;
184 port->gs.rd = &scc_real_driver;
185 #ifdef NEW_WRITE_LOCKING
186 port->gs.port_write_mutex = MUTEX;
187 #endif
188 init_waitqueue_head(&port->gs.open_wait);
189 init_waitqueue_head(&port->gs.close_wait);
190 }
191 }
192
193
194 #ifdef CONFIG_MVME147_SCC
195 static int mvme147_scc_init(void)
196 {
197 struct scc_port *port;
198
199 printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
200 /* Init channel A */
201 port = &scc_ports[0];
202 port->channel = CHANNEL_A;
203 port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
204 port->datap = port->ctrlp + 1;
205 port->port_a = &scc_ports[0];
206 port->port_b = &scc_ports[1];
207 request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
208 "SCC-A TX", port);
209 request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
210 "SCC-A status", port);
211 request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
212 "SCC-A RX", port);
213 request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
214 "SCC-A special cond", port);
215 {
216 SCC_ACCESS_INIT(port);
217
218 /* disable interrupts for this channel */
219 SCCwrite(INT_AND_DMA_REG, 0);
220 /* Set the interrupt vector */
221 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
222 /* Interrupt parameters: vector includes status, status low */
223 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
224 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
225 }
226
227 /* Init channel B */
228 port = &scc_ports[1];
229 port->channel = CHANNEL_B;
230 port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
231 port->datap = port->ctrlp + 1;
232 port->port_a = &scc_ports[0];
233 port->port_b = &scc_ports[1];
234 request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
235 "SCC-B TX", port);
236 request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
237 "SCC-B status", port);
238 request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
239 "SCC-B RX", port);
240 request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
241 "SCC-B special cond", port);
242 {
243 SCC_ACCESS_INIT(port);
244
245 /* disable interrupts for this channel */
246 SCCwrite(INT_AND_DMA_REG, 0);
247 }
248
249 /* Ensure interrupts are enabled in the PCC chip */
250 m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
251
252 /* Initialise the tty driver structures and register */
253 scc_init_portstructs();
254 scc_init_drivers();
255
256 return 0;
257 }
258 #endif
259
260
261 #ifdef CONFIG_MVME162_SCC
262 static int mvme162_scc_init(void)
263 {
264 struct scc_port *port;
265
266 if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
267 return (-ENODEV);
268
269 printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
270 /* Init channel A */
271 port = &scc_ports[0];
272 port->channel = CHANNEL_A;
273 port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
274 port->datap = port->ctrlp + 2;
275 port->port_a = &scc_ports[0];
276 port->port_b = &scc_ports[1];
277 request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
278 "SCC-A TX", port);
279 request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
280 "SCC-A status", port);
281 request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
282 "SCC-A RX", port);
283 request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
284 "SCC-A special cond", port);
285 {
286 SCC_ACCESS_INIT(port);
287
288 /* disable interrupts for this channel */
289 SCCwrite(INT_AND_DMA_REG, 0);
290 /* Set the interrupt vector */
291 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
292 /* Interrupt parameters: vector includes status, status low */
293 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
294 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
295 }
296
297 /* Init channel B */
298 port = &scc_ports[1];
299 port->channel = CHANNEL_B;
300 port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
301 port->datap = port->ctrlp + 2;
302 port->port_a = &scc_ports[0];
303 port->port_b = &scc_ports[1];
304 request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
305 "SCC-B TX", port);
306 request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
307 "SCC-B status", port);
308 request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
309 "SCC-B RX", port);
310 request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
311 "SCC-B special cond", port);
312
313 {
314 SCC_ACCESS_INIT(port); /* Either channel will do */
315
316 /* disable interrupts for this channel */
317 SCCwrite(INT_AND_DMA_REG, 0);
318 }
319
320 /* Ensure interrupts are enabled in the MC2 chip */
321 *(volatile char *)0xfff4201d = 0x14;
322
323 /* Initialise the tty driver structures and register */
324 scc_init_portstructs();
325 scc_init_drivers();
326
327 return 0;
328 }
329 #endif
330
331
332 #ifdef CONFIG_BVME6000_SCC
333 static int bvme6000_scc_init(void)
334 {
335 struct scc_port *port;
336
337 printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
338 /* Init channel A */
339 port = &scc_ports[0];
340 port->channel = CHANNEL_A;
341 port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
342 port->datap = port->ctrlp + 4;
343 port->port_a = &scc_ports[0];
344 port->port_b = &scc_ports[1];
345 request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
346 "SCC-A TX", port);
347 request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
348 "SCC-A status", port);
349 request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
350 "SCC-A RX", port);
351 request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
352 "SCC-A special cond", port);
353 {
354 SCC_ACCESS_INIT(port);
355
356 /* disable interrupts for this channel */
357 SCCwrite(INT_AND_DMA_REG, 0);
358 /* Set the interrupt vector */
359 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
360 /* Interrupt parameters: vector includes status, status low */
361 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
362 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
363 }
364
365 /* Init channel B */
366 port = &scc_ports[1];
367 port->channel = CHANNEL_B;
368 port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
369 port->datap = port->ctrlp + 4;
370 port->port_a = &scc_ports[0];
371 port->port_b = &scc_ports[1];
372 request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
373 "SCC-B TX", port);
374 request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
375 "SCC-B status", port);
376 request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
377 "SCC-B RX", port);
378 request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
379 "SCC-B special cond", port);
380
381 {
382 SCC_ACCESS_INIT(port); /* Either channel will do */
383
384 /* disable interrupts for this channel */
385 SCCwrite(INT_AND_DMA_REG, 0);
386 }
387
388 /* Initialise the tty driver structures and register */
389 scc_init_portstructs();
390 scc_init_drivers();
391
392 return 0;
393 }
394 #endif
395
396
397 static int vme_scc_init(void)
398 {
399 int res = -ENODEV;
400
401 #ifdef CONFIG_MVME147_SCC
402 if (MACH_IS_MVME147)
403 res = mvme147_scc_init();
404 #endif
405 #ifdef CONFIG_MVME162_SCC
406 if (MACH_IS_MVME16x)
407 res = mvme162_scc_init();
408 #endif
409 #ifdef CONFIG_BVME6000_SCC
410 if (MACH_IS_BVME6000)
411 res = bvme6000_scc_init();
412 #endif
413 return res;
414 }
415
416 module_init(vme_scc_init);
417
418
419 /*---------------------------------------------------------------------------
420 * Interrupt handlers
421 *--------------------------------------------------------------------------*/
422
423 static irqreturn_t scc_rx_int(int irq, void *data)
424 {
425 unsigned char ch;
426 struct scc_port *port = data;
427 struct tty_struct *tty = port->gs.tty;
428 SCC_ACCESS_INIT(port);
429
430 ch = SCCread_NB(RX_DATA_REG);
431 if (!tty) {
432 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
433 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
434 return IRQ_HANDLED;
435 }
436 tty_insert_flip_char(tty, ch, 0);
437
438 /* Check if another character is already ready; in that case, the
439 * spcond_int() function must be used, because this character may have an
440 * error condition that isn't signalled by the interrupt vector used!
441 */
442 if (SCCread(INT_PENDING_REG) &
443 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
444 scc_spcond_int (irq, data);
445 return IRQ_HANDLED;
446 }
447
448 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
449
450 tty_flip_buffer_push(tty);
451 return IRQ_HANDLED;
452 }
453
454
455 static irqreturn_t scc_spcond_int(int irq, void *data)
456 {
457 struct scc_port *port = data;
458 struct tty_struct *tty = port->gs.tty;
459 unsigned char stat, ch, err;
460 int int_pending_mask = port->channel == CHANNEL_A ?
461 IPR_A_RX : IPR_B_RX;
462 SCC_ACCESS_INIT(port);
463
464 if (!tty) {
465 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
466 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
467 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
468 return IRQ_HANDLED;
469 }
470 do {
471 stat = SCCread(SPCOND_STATUS_REG);
472 ch = SCCread_NB(RX_DATA_REG);
473
474 if (stat & SCSR_RX_OVERRUN)
475 err = TTY_OVERRUN;
476 else if (stat & SCSR_PARITY_ERR)
477 err = TTY_PARITY;
478 else if (stat & SCSR_CRC_FRAME_ERR)
479 err = TTY_FRAME;
480 else
481 err = 0;
482
483 tty_insert_flip_char(tty, ch, err);
484
485 /* ++TeSche: *All* errors have to be cleared manually,
486 * else the condition persists for the next chars
487 */
488 if (err)
489 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
490
491 } while(SCCread(INT_PENDING_REG) & int_pending_mask);
492
493 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
494
495 tty_flip_buffer_push(tty);
496 return IRQ_HANDLED;
497 }
498
499
500 static irqreturn_t scc_tx_int(int irq, void *data)
501 {
502 struct scc_port *port = data;
503 SCC_ACCESS_INIT(port);
504
505 if (!port->gs.tty) {
506 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
507 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
508 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
509 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
510 return IRQ_HANDLED;
511 }
512 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
513 if (port->x_char) {
514 SCCwrite(TX_DATA_REG, port->x_char);
515 port->x_char = 0;
516 }
517 else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
518 port->gs.tty->hw_stopped)
519 break;
520 else {
521 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
522 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
523 if (--port->gs.xmit_cnt <= 0)
524 break;
525 }
526 }
527 if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
528 port->gs.tty->hw_stopped) {
529 /* disable tx interrupts */
530 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
531 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
532 port->gs.flags &= ~GS_TX_INTEN;
533 }
534 if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
535 tty_wakeup(port->gs.tty);
536
537 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
538 return IRQ_HANDLED;
539 }
540
541
542 static irqreturn_t scc_stat_int(int irq, void *data)
543 {
544 struct scc_port *port = data;
545 unsigned channel = port->channel;
546 unsigned char last_sr, sr, changed;
547 SCC_ACCESS_INIT(port);
548
549 last_sr = scc_last_status_reg[channel];
550 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
551 changed = last_sr ^ sr;
552
553 if (changed & SR_DCD) {
554 port->c_dcd = !!(sr & SR_DCD);
555 if (!(port->gs.flags & ASYNC_CHECK_CD))
556 ; /* Don't report DCD changes */
557 else if (port->c_dcd) {
558 wake_up_interruptible(&port->gs.open_wait);
559 }
560 else {
561 if (port->gs.tty)
562 tty_hangup (port->gs.tty);
563 }
564 }
565 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
566 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
567 return IRQ_HANDLED;
568 }
569
570
571 /*---------------------------------------------------------------------------
572 * generic_serial.c callback funtions
573 *--------------------------------------------------------------------------*/
574
575 static void scc_disable_tx_interrupts(void *ptr)
576 {
577 struct scc_port *port = ptr;
578 unsigned long flags;
579 SCC_ACCESS_INIT(port);
580
581 local_irq_save(flags);
582 SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
583 port->gs.flags &= ~GS_TX_INTEN;
584 local_irq_restore(flags);
585 }
586
587
588 static void scc_enable_tx_interrupts(void *ptr)
589 {
590 struct scc_port *port = ptr;
591 unsigned long flags;
592 SCC_ACCESS_INIT(port);
593
594 local_irq_save(flags);
595 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
596 /* restart the transmitter */
597 scc_tx_int (0, port);
598 local_irq_restore(flags);
599 }
600
601
602 static void scc_disable_rx_interrupts(void *ptr)
603 {
604 struct scc_port *port = ptr;
605 unsigned long flags;
606 SCC_ACCESS_INIT(port);
607
608 local_irq_save(flags);
609 SCCmod(INT_AND_DMA_REG,
610 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
611 local_irq_restore(flags);
612 }
613
614
615 static void scc_enable_rx_interrupts(void *ptr)
616 {
617 struct scc_port *port = ptr;
618 unsigned long flags;
619 SCC_ACCESS_INIT(port);
620
621 local_irq_save(flags);
622 SCCmod(INT_AND_DMA_REG, 0xff,
623 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
624 local_irq_restore(flags);
625 }
626
627
628 static int scc_get_CD(void *ptr)
629 {
630 struct scc_port *port = ptr;
631 unsigned channel = port->channel;
632
633 return !!(scc_last_status_reg[channel] & SR_DCD);
634 }
635
636
637 static void scc_shutdown_port(void *ptr)
638 {
639 struct scc_port *port = ptr;
640
641 port->gs.flags &= ~ GS_ACTIVE;
642 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
643 scc_setsignals (port, 0, 0);
644 }
645 }
646
647
648 static int scc_set_real_termios (void *ptr)
649 {
650 /* the SCC has char sizes 5,7,6,8 in that order! */
651 static int chsize_map[4] = { 0, 2, 1, 3 };
652 unsigned cflag, baud, chsize, channel, brgval = 0;
653 unsigned long flags;
654 struct scc_port *port = ptr;
655 SCC_ACCESS_INIT(port);
656
657 if (!port->gs.tty || !port->gs.tty->termios) return 0;
658
659 channel = port->channel;
660
661 if (channel == CHANNEL_A)
662 return 0; /* Settings controlled by boot PROM */
663
664 cflag = port->gs.tty->termios->c_cflag;
665 baud = port->gs.baud;
666 chsize = (cflag & CSIZE) >> 4;
667
668 if (baud == 0) {
669 /* speed == 0 -> drop DTR */
670 local_irq_save(flags);
671 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
672 local_irq_restore(flags);
673 return 0;
674 }
675 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
676 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
677 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
678 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
679 return 0;
680 }
681
682 if (cflag & CLOCAL)
683 port->gs.flags &= ~ASYNC_CHECK_CD;
684 else
685 port->gs.flags |= ASYNC_CHECK_CD;
686
687 #ifdef CONFIG_MVME147_SCC
688 if (MACH_IS_MVME147)
689 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
690 #endif
691 #ifdef CONFIG_MVME162_SCC
692 if (MACH_IS_MVME16x)
693 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
694 #endif
695 #ifdef CONFIG_BVME6000_SCC
696 if (MACH_IS_BVME6000)
697 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
698 #endif
699 /* Now we have all parameters and can go to set them: */
700 local_irq_save(flags);
701
702 /* receiver's character size and auto-enables */
703 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
704 (chsize_map[chsize] << 6) |
705 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
706 /* parity and stop bits (both, Tx and Rx), clock mode never changes */
707 SCCmod (AUX1_CTRL_REG,
708 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
709 ((cflag & PARENB
710 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
711 : A1CR_PARITY_NONE)
712 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
713 /* sender's character size, set DTR for valid baud rate */
714 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
715 /* clock sources never change */
716 /* disable BRG before changing the value */
717 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
718 /* BRG value */
719 SCCwrite(TIMER_LOW_REG, brgval & 0xff);
720 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
721 /* BRG enable, and clock source never changes */
722 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
723
724 local_irq_restore(flags);
725
726 return 0;
727 }
728
729
730 static int scc_chars_in_buffer (void *ptr)
731 {
732 struct scc_port *port = ptr;
733 SCC_ACCESS_INIT(port);
734
735 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
736 }
737
738
739 /* Comment taken from sx.c (2.4.0):
740 I haven't the foggiest why the decrement use count has to happen
741 here. The whole linux serial drivers stuff needs to be redesigned.
742 My guess is that this is a hack to minimize the impact of a bug
743 elsewhere. Thinking about it some more. (try it sometime) Try
744 running minicom on a serial port that is driven by a modularized
745 driver. Have the modem hangup. Then remove the driver module. Then
746 exit minicom. I expect an "oops". -- REW */
747
748 static void scc_hungup(void *ptr)
749 {
750 scc_disable_tx_interrupts(ptr);
751 scc_disable_rx_interrupts(ptr);
752 }
753
754
755 static void scc_close(void *ptr)
756 {
757 scc_disable_tx_interrupts(ptr);
758 scc_disable_rx_interrupts(ptr);
759 }
760
761
762 /*---------------------------------------------------------------------------
763 * Internal support functions
764 *--------------------------------------------------------------------------*/
765
766 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
767 {
768 unsigned long flags;
769 unsigned char t;
770 SCC_ACCESS_INIT(port);
771
772 local_irq_save(flags);
773 t = SCCread(TX_CTRL_REG);
774 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
775 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
776 SCCwrite(TX_CTRL_REG, t);
777 local_irq_restore(flags);
778 }
779
780
781 static void scc_send_xchar(struct tty_struct *tty, char ch)
782 {
783 struct scc_port *port = (struct scc_port *)tty->driver_data;
784
785 port->x_char = ch;
786 if (ch)
787 scc_enable_tx_interrupts(port);
788 }
789
790
791 /*---------------------------------------------------------------------------
792 * Driver entrypoints referenced from above
793 *--------------------------------------------------------------------------*/
794
795 static int scc_open (struct tty_struct * tty, struct file * filp)
796 {
797 int line = tty->index;
798 int retval;
799 struct scc_port *port = &scc_ports[line];
800 int i, channel = port->channel;
801 unsigned long flags;
802 SCC_ACCESS_INIT(port);
803 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
804 static const struct {
805 unsigned reg, val;
806 } mvme_init_tab[] = {
807 /* Values for MVME162 and MVME147 */
808 /* no parity, 1 stop bit, async, 1:16 */
809 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
810 /* parity error is special cond, ints disabled, no DMA */
811 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
812 /* Rx 8 bits/char, no auto enable, Rx off */
813 { RX_CTRL_REG, RCR_CHSIZE_8 },
814 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
815 { TX_CTRL_REG, TCR_CHSIZE_8 },
816 /* special features off */
817 { AUX2_CTRL_REG, 0 },
818 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
819 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
820 /* Start Rx */
821 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
822 /* Start Tx */
823 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
824 /* Ext/Stat ints: DCD only */
825 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
826 /* Reset Ext/Stat ints */
827 { COMMAND_REG, CR_EXTSTAT_RESET },
828 /* ...again */
829 { COMMAND_REG, CR_EXTSTAT_RESET },
830 };
831 #endif
832 #if defined(CONFIG_BVME6000_SCC)
833 static const struct {
834 unsigned reg, val;
835 } bvme_init_tab[] = {
836 /* Values for BVME6000 */
837 /* no parity, 1 stop bit, async, 1:16 */
838 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
839 /* parity error is special cond, ints disabled, no DMA */
840 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
841 /* Rx 8 bits/char, no auto enable, Rx off */
842 { RX_CTRL_REG, RCR_CHSIZE_8 },
843 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
844 { TX_CTRL_REG, TCR_CHSIZE_8 },
845 /* special features off */
846 { AUX2_CTRL_REG, 0 },
847 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
848 { DPLL_CTRL_REG, DCR_BRG_ENAB },
849 /* Start Rx */
850 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
851 /* Start Tx */
852 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
853 /* Ext/Stat ints: DCD only */
854 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
855 /* Reset Ext/Stat ints */
856 { COMMAND_REG, CR_EXTSTAT_RESET },
857 /* ...again */
858 { COMMAND_REG, CR_EXTSTAT_RESET },
859 };
860 #endif
861 if (!(port->gs.flags & ASYNC_INITIALIZED)) {
862 local_irq_save(flags);
863 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
864 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
865 for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
866 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
867 }
868 #endif
869 #if defined(CONFIG_BVME6000_SCC)
870 if (MACH_IS_BVME6000) {
871 for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
872 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
873 }
874 #endif
875
876 /* remember status register for detection of DCD and CTS changes */
877 scc_last_status_reg[channel] = SCCread(STATUS_REG);
878
879 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
880 scc_setsignals (port, 1,1);
881 local_irq_restore(flags);
882 }
883
884 tty->driver_data = port;
885 port->gs.tty = tty;
886 port->gs.count++;
887 retval = gs_init_port(&port->gs);
888 if (retval) {
889 port->gs.count--;
890 return retval;
891 }
892 port->gs.flags |= GS_ACTIVE;
893 retval = gs_block_til_ready(port, filp);
894
895 if (retval) {
896 port->gs.count--;
897 return retval;
898 }
899
900 port->c_dcd = scc_get_CD (port);
901
902 scc_enable_rx_interrupts(port);
903
904 return 0;
905 }
906
907
908 static void scc_throttle (struct tty_struct * tty)
909 {
910 struct scc_port *port = (struct scc_port *)tty->driver_data;
911 unsigned long flags;
912 SCC_ACCESS_INIT(port);
913
914 if (tty->termios->c_cflag & CRTSCTS) {
915 local_irq_save(flags);
916 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
917 local_irq_restore(flags);
918 }
919 if (I_IXOFF(tty))
920 scc_send_xchar(tty, STOP_CHAR(tty));
921 }
922
923
924 static void scc_unthrottle (struct tty_struct * tty)
925 {
926 struct scc_port *port = (struct scc_port *)tty->driver_data;
927 unsigned long flags;
928 SCC_ACCESS_INIT(port);
929
930 if (tty->termios->c_cflag & CRTSCTS) {
931 local_irq_save(flags);
932 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
933 local_irq_restore(flags);
934 }
935 if (I_IXOFF(tty))
936 scc_send_xchar(tty, START_CHAR(tty));
937 }
938
939
940 static int scc_ioctl(struct tty_struct *tty, struct file *file,
941 unsigned int cmd, unsigned long arg)
942 {
943 return -ENOIOCTLCMD;
944 }
945
946
947 static void scc_break_ctl(struct tty_struct *tty, int break_state)
948 {
949 struct scc_port *port = (struct scc_port *)tty->driver_data;
950 unsigned long flags;
951 SCC_ACCESS_INIT(port);
952
953 local_irq_save(flags);
954 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
955 break_state ? TCR_SEND_BREAK : 0);
956 local_irq_restore(flags);
957 }
958
959
960 /*---------------------------------------------------------------------------
961 * Serial console stuff...
962 *--------------------------------------------------------------------------*/
963
964 #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
965
966 static void scc_ch_write (char ch)
967 {
968 volatile char *p = NULL;
969
970 #ifdef CONFIG_MVME147_SCC
971 if (MACH_IS_MVME147)
972 p = (volatile char *)M147_SCC_A_ADDR;
973 #endif
974 #ifdef CONFIG_MVME162_SCC
975 if (MACH_IS_MVME16x)
976 p = (volatile char *)MVME_SCC_A_ADDR;
977 #endif
978 #ifdef CONFIG_BVME6000_SCC
979 if (MACH_IS_BVME6000)
980 p = (volatile char *)BVME_SCC_A_ADDR;
981 #endif
982
983 do {
984 scc_delay();
985 }
986 while (!(*p & 4));
987 scc_delay();
988 *p = 8;
989 scc_delay();
990 *p = ch;
991 }
992
993 /* The console must be locked when we get here. */
994
995 static void scc_console_write (struct console *co, const char *str, unsigned count)
996 {
997 unsigned long flags;
998
999 local_irq_save(flags);
1000
1001 while (count--)
1002 {
1003 if (*str == '\n')
1004 scc_ch_write ('\r');
1005 scc_ch_write (*str++);
1006 }
1007 local_irq_restore(flags);
1008 }
1009
1010 static struct tty_driver *scc_console_device(struct console *c, int *index)
1011 {
1012 *index = c->index;
1013 return scc_driver;
1014 }
1015
1016 static struct console sercons = {
1017 .name = "ttyS",
1018 .write = scc_console_write,
1019 .device = scc_console_device,
1020 .flags = CON_PRINTBUFFER,
1021 .index = -1,
1022 };
1023
1024
1025 static int __init vme_scc_console_init(void)
1026 {
1027 if (vme_brdtype == VME_TYPE_MVME147 ||
1028 vme_brdtype == VME_TYPE_MVME162 ||
1029 vme_brdtype == VME_TYPE_MVME172 ||
1030 vme_brdtype == VME_TYPE_BVME4000 ||
1031 vme_brdtype == VME_TYPE_BVME6000)
1032 register_console(&sercons);
1033 return 0;
1034 }
1035 console_initcall(vme_scc_console_init);
Support for the Chinese Samsung S3C2440 based development boards