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sunbmac: Fix compiler warning
[linux-2.6/btrfs-unstable.git] / drivers / tty / serial / sunsab.c
blobb5e3195b3697334598f4f1171afe83825d6b0637
1 /* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC.
2 *
3 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
4 * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net)
5 *
6 * Rewrote buffer handling to use CIRC(Circular Buffer) macros.
7 * Maxim Krasnyanskiy <maxk@qualcomm.com>
8 *
9 * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
10 * rates to be programmed into the UART. Also eliminated a lot of
11 * duplicated code in the console setup.
12 * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
13 *
14 * Ported to new 2.5.x UART layer.
15 * David S. Miller <davem@davemloft.net>
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/tty.h>
22 #include <linux/tty_flip.h>
23 #include <linux/major.h>
24 #include <linux/string.h>
25 #include <linux/ptrace.h>
26 #include <linux/ioport.h>
27 #include <linux/circ_buf.h>
28 #include <linux/serial.h>
29 #include <linux/sysrq.h>
30 #include <linux/console.h>
31 #include <linux/spinlock.h>
32 #include <linux/slab.h>
33 #include <linux/delay.h>
34 #include <linux/init.h>
35 #include <linux/of_device.h>
36
37 #include <asm/io.h>
38 #include <asm/irq.h>
39 #include <asm/prom.h>
40 #include <asm/setup.h>
41
42 #if defined(CONFIG_SERIAL_SUNSAB_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
43 #define SUPPORT_SYSRQ
44 #endif
45
46 #include <linux/serial_core.h>
47 #include <linux/sunserialcore.h>
48
49 #include "sunsab.h"
50
51 struct uart_sunsab_port {
52 struct uart_port port; /* Generic UART port */
53 union sab82532_async_regs __iomem *regs; /* Chip registers */
54 unsigned long irqflags; /* IRQ state flags */
55 int dsr; /* Current DSR state */
56 unsigned int cec_timeout; /* Chip poll timeout... */
57 unsigned int tec_timeout; /* likewise */
58 unsigned char interrupt_mask0;/* ISR0 masking */
59 unsigned char interrupt_mask1;/* ISR1 masking */
60 unsigned char pvr_dtr_bit; /* Which PVR bit is DTR */
61 unsigned char pvr_dsr_bit; /* Which PVR bit is DSR */
62 unsigned int gis_shift;
63 int type; /* SAB82532 version */
64
65 /* Setting configuration bits while the transmitter is active
66 * can cause garbage characters to get emitted by the chip.
67 * Therefore, we cache such writes here and do the real register
68 * write the next time the transmitter becomes idle.
69 */
70 unsigned int cached_ebrg;
71 unsigned char cached_mode;
72 unsigned char cached_pvr;
73 unsigned char cached_dafo;
74 };
75
76 /*
77 * This assumes you have a 29.4912 MHz clock for your UART.
78 */
79 #define SAB_BASE_BAUD ( 29491200 / 16 )
80
81 static char *sab82532_version[16] = {
82 "V1.0", "V2.0", "V3.2", "V(0x03)",
83 "V(0x04)", "V(0x05)", "V(0x06)", "V(0x07)",
84 "V(0x08)", "V(0x09)", "V(0x0a)", "V(0x0b)",
85 "V(0x0c)", "V(0x0d)", "V(0x0e)", "V(0x0f)"
86 };
87
88 #define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
89 #define SAB82532_MAX_CEC_TIMEOUT 50000 /* 2.5 TX CLKs (at 50 baud) */
90
91 #define SAB82532_RECV_FIFO_SIZE 32 /* Standard async fifo sizes */
92 #define SAB82532_XMIT_FIFO_SIZE 32
93
94 static __inline__ void sunsab_tec_wait(struct uart_sunsab_port *up)
95 {
96 int timeout = up->tec_timeout;
97
98 while ((readb(&up->regs->r.star) & SAB82532_STAR_TEC) && --timeout)
99 udelay(1);
100 }
101
102 static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
103 {
104 int timeout = up->cec_timeout;
105
106 while ((readb(&up->regs->r.star) & SAB82532_STAR_CEC) && --timeout)
107 udelay(1);
108 }
109
110 static struct tty_port *
111 receive_chars(struct uart_sunsab_port *up,
112 union sab82532_irq_status *stat)
113 {
114 struct tty_port *port = NULL;
115 unsigned char buf[32];
116 int saw_console_brk = 0;
117 int free_fifo = 0;
118 int count = 0;
119 int i;
120
121 if (up->port.state != NULL) /* Unopened serial console */
122 port = &up->port.state->port;
123
124 /* Read number of BYTES (Character + Status) available. */
125 if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
126 count = SAB82532_RECV_FIFO_SIZE;
127 free_fifo++;
128 }
129
130 if (stat->sreg.isr0 & SAB82532_ISR0_TCD) {
131 count = readb(&up->regs->r.rbcl) & (SAB82532_RECV_FIFO_SIZE - 1);
132 free_fifo++;
133 }
134
135 /* Issue a FIFO read command in case we where idle. */
136 if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
137 sunsab_cec_wait(up);
138 writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
139 return port;
140 }
141
142 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
143 free_fifo++;
144
145 /* Read the FIFO. */
146 for (i = 0; i < count; i++)
147 buf[i] = readb(&up->regs->r.rfifo[i]);
148
149 /* Issue Receive Message Complete command. */
150 if (free_fifo) {
151 sunsab_cec_wait(up);
152 writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr);
153 }
154
155 /* Count may be zero for BRK, so we check for it here */
156 if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
157 (up->port.line == up->port.cons->index))
158 saw_console_brk = 1;
159
160 if (count == 0) {
161 if (unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
162 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
163 SAB82532_ISR0_FERR);
164 up->port.icount.brk++;
165 uart_handle_break(&up->port);
166 }
167 }
168
169 for (i = 0; i < count; i++) {
170 unsigned char ch = buf[i], flag;
171
172 flag = TTY_NORMAL;
173 up->port.icount.rx++;
174
175 if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR |
176 SAB82532_ISR0_FERR |
177 SAB82532_ISR0_RFO)) ||
178 unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
179 /*
180 * For statistics only
181 */
182 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
183 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
184 SAB82532_ISR0_FERR);
185 up->port.icount.brk++;
186 /*
187 * We do the SysRQ and SAK checking
188 * here because otherwise the break
189 * may get masked by ignore_status_mask
190 * or read_status_mask.
191 */
192 if (uart_handle_break(&up->port))
193 continue;
194 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
195 up->port.icount.parity++;
196 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
197 up->port.icount.frame++;
198 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
199 up->port.icount.overrun++;
200
201 /*
202 * Mask off conditions which should be ingored.
203 */
204 stat->sreg.isr0 &= (up->port.read_status_mask & 0xff);
205 stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff);
206
207 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
208 flag = TTY_BREAK;
209 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
210 flag = TTY_PARITY;
211 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
212 flag = TTY_FRAME;
213 }
214
215 if (uart_handle_sysrq_char(&up->port, ch) || !port)
216 continue;
217
218 if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
219 (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0)
220 tty_insert_flip_char(port, ch, flag);
221 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
222 tty_insert_flip_char(port, 0, TTY_OVERRUN);
223 }
224
225 if (saw_console_brk)
226 sun_do_break();
227
228 return port;
229 }
230
231 static void sunsab_stop_tx(struct uart_port *);
232 static void sunsab_tx_idle(struct uart_sunsab_port *);
233
234 static void transmit_chars(struct uart_sunsab_port *up,
235 union sab82532_irq_status *stat)
236 {
237 struct circ_buf *xmit = &up->port.state->xmit;
238 int i;
239
240 if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
241 up->interrupt_mask1 |= SAB82532_IMR1_ALLS;
242 writeb(up->interrupt_mask1, &up->regs->w.imr1);
243 set_bit(SAB82532_ALLS, &up->irqflags);
244 }
245
246 #if 0 /* bde@nwlink.com says this check causes problems */
247 if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR))
248 return;
249 #endif
250
251 if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW))
252 return;
253
254 set_bit(SAB82532_XPR, &up->irqflags);
255 sunsab_tx_idle(up);
256
257 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
258 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
259 writeb(up->interrupt_mask1, &up->regs->w.imr1);
260 return;
261 }
262
263 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
264 writeb(up->interrupt_mask1, &up->regs->w.imr1);
265 clear_bit(SAB82532_ALLS, &up->irqflags);
266
267 /* Stuff 32 bytes into Transmit FIFO. */
268 clear_bit(SAB82532_XPR, &up->irqflags);
269 for (i = 0; i < up->port.fifosize; i++) {
270 writeb(xmit->buf[xmit->tail],
271 &up->regs->w.xfifo[i]);
272 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
273 up->port.icount.tx++;
274 if (uart_circ_empty(xmit))
275 break;
276 }
277
278 /* Issue a Transmit Frame command. */
279 sunsab_cec_wait(up);
280 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
281
282 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
283 uart_write_wakeup(&up->port);
284
285 if (uart_circ_empty(xmit))
286 sunsab_stop_tx(&up->port);
287 }
288
289 static void check_status(struct uart_sunsab_port *up,
290 union sab82532_irq_status *stat)
291 {
292 if (stat->sreg.isr0 & SAB82532_ISR0_CDSC)
293 uart_handle_dcd_change(&up->port,
294 !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD));
295
296 if (stat->sreg.isr1 & SAB82532_ISR1_CSC)
297 uart_handle_cts_change(&up->port,
298 (readb(&up->regs->r.star) & SAB82532_STAR_CTS));
299
300 if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) {
301 up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1;
302 up->port.icount.dsr++;
303 }
304
305 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
306 }
307
308 static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
309 {
310 struct uart_sunsab_port *up = dev_id;
311 struct tty_port *port = NULL;
312 union sab82532_irq_status status;
313 unsigned long flags;
314 unsigned char gis;
315
316 spin_lock_irqsave(&up->port.lock, flags);
317
318 status.stat = 0;
319 gis = readb(&up->regs->r.gis) >> up->gis_shift;
320 if (gis & 1)
321 status.sreg.isr0 = readb(&up->regs->r.isr0);
322 if (gis & 2)
323 status.sreg.isr1 = readb(&up->regs->r.isr1);
324
325 if (status.stat) {
326 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
327 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
328 (status.sreg.isr1 & SAB82532_ISR1_BRK))
329 port = receive_chars(up, &status);
330 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
331 (status.sreg.isr1 & SAB82532_ISR1_CSC))
332 check_status(up, &status);
333 if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
334 transmit_chars(up, &status);
335 }
336
337 spin_unlock_irqrestore(&up->port.lock, flags);
338
339 if (port)
340 tty_flip_buffer_push(port);
341
342 return IRQ_HANDLED;
343 }
344
345 /* port->lock is not held. */
346 static unsigned int sunsab_tx_empty(struct uart_port *port)
347 {
348 struct uart_sunsab_port *up =
349 container_of(port, struct uart_sunsab_port, port);
350 int ret;
351
352 /* Do not need a lock for a state test like this. */
353 if (test_bit(SAB82532_ALLS, &up->irqflags))
354 ret = TIOCSER_TEMT;
355 else
356 ret = 0;
357
358 return ret;
359 }
360
361 /* port->lock held by caller. */
362 static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
363 {
364 struct uart_sunsab_port *up =
365 container_of(port, struct uart_sunsab_port, port);
366
367 if (mctrl & TIOCM_RTS) {
368 up->cached_mode &= ~SAB82532_MODE_FRTS;
369 up->cached_mode |= SAB82532_MODE_RTS;
370 } else {
371 up->cached_mode |= (SAB82532_MODE_FRTS |
372 SAB82532_MODE_RTS);
373 }
374 if (mctrl & TIOCM_DTR) {
375 up->cached_pvr &= ~(up->pvr_dtr_bit);
376 } else {
377 up->cached_pvr |= up->pvr_dtr_bit;
378 }
379
380 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
381 if (test_bit(SAB82532_XPR, &up->irqflags))
382 sunsab_tx_idle(up);
383 }
384
385 /* port->lock is held by caller and interrupts are disabled. */
386 static unsigned int sunsab_get_mctrl(struct uart_port *port)
387 {
388 struct uart_sunsab_port *up =
389 container_of(port, struct uart_sunsab_port, port);
390 unsigned char val;
391 unsigned int result;
392
393 result = 0;
394
395 val = readb(&up->regs->r.pvr);
396 result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
397
398 val = readb(&up->regs->r.vstr);
399 result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR;
400
401 val = readb(&up->regs->r.star);
402 result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
403
404 return result;
405 }
406
407 /* port->lock held by caller. */
408 static void sunsab_stop_tx(struct uart_port *port)
409 {
410 struct uart_sunsab_port *up =
411 container_of(port, struct uart_sunsab_port, port);
412
413 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
414 writeb(up->interrupt_mask1, &up->regs->w.imr1);
415 }
416
417 /* port->lock held by caller. */
418 static void sunsab_tx_idle(struct uart_sunsab_port *up)
419 {
420 if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) {
421 u8 tmp;
422
423 clear_bit(SAB82532_REGS_PENDING, &up->irqflags);
424 writeb(up->cached_mode, &up->regs->rw.mode);
425 writeb(up->cached_pvr, &up->regs->rw.pvr);
426 writeb(up->cached_dafo, &up->regs->w.dafo);
427
428 writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr);
429 tmp = readb(&up->regs->rw.ccr2);
430 tmp &= ~0xc0;
431 tmp |= (up->cached_ebrg >> 2) & 0xc0;
432 writeb(tmp, &up->regs->rw.ccr2);
433 }
434 }
435
436 /* port->lock held by caller. */
437 static void sunsab_start_tx(struct uart_port *port)
438 {
439 struct uart_sunsab_port *up =
440 container_of(port, struct uart_sunsab_port, port);
441 struct circ_buf *xmit = &up->port.state->xmit;
442 int i;
443
444 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
445 return;
446
447 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
448 writeb(up->interrupt_mask1, &up->regs->w.imr1);
449
450 if (!test_bit(SAB82532_XPR, &up->irqflags))
451 return;
452
453 clear_bit(SAB82532_ALLS, &up->irqflags);
454 clear_bit(SAB82532_XPR, &up->irqflags);
455
456 for (i = 0; i < up->port.fifosize; i++) {
457 writeb(xmit->buf[xmit->tail],
458 &up->regs->w.xfifo[i]);
459 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
460 up->port.icount.tx++;
461 if (uart_circ_empty(xmit))
462 break;
463 }
464
465 /* Issue a Transmit Frame command. */
466 sunsab_cec_wait(up);
467 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
468 }
469
470 /* port->lock is not held. */
471 static void sunsab_send_xchar(struct uart_port *port, char ch)
472 {
473 struct uart_sunsab_port *up =
474 container_of(port, struct uart_sunsab_port, port);
475 unsigned long flags;
476
477 if (ch == __DISABLED_CHAR)
478 return;
479
480 spin_lock_irqsave(&up->port.lock, flags);
481
482 sunsab_tec_wait(up);
483 writeb(ch, &up->regs->w.tic);
484
485 spin_unlock_irqrestore(&up->port.lock, flags);
486 }
487
488 /* port->lock held by caller. */
489 static void sunsab_stop_rx(struct uart_port *port)
490 {
491 struct uart_sunsab_port *up =
492 container_of(port, struct uart_sunsab_port, port);
493
494 up->interrupt_mask0 |= SAB82532_IMR0_TCD;
495 writeb(up->interrupt_mask1, &up->regs->w.imr0);
496 }
497
498 /* port->lock is not held. */
499 static void sunsab_break_ctl(struct uart_port *port, int break_state)
500 {
501 struct uart_sunsab_port *up =
502 container_of(port, struct uart_sunsab_port, port);
503 unsigned long flags;
504 unsigned char val;
505
506 spin_lock_irqsave(&up->port.lock, flags);
507
508 val = up->cached_dafo;
509 if (break_state)
510 val |= SAB82532_DAFO_XBRK;
511 else
512 val &= ~SAB82532_DAFO_XBRK;
513 up->cached_dafo = val;
514
515 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
516 if (test_bit(SAB82532_XPR, &up->irqflags))
517 sunsab_tx_idle(up);
518
519 spin_unlock_irqrestore(&up->port.lock, flags);
520 }
521
522 /* port->lock is not held. */
523 static int sunsab_startup(struct uart_port *port)
524 {
525 struct uart_sunsab_port *up =
526 container_of(port, struct uart_sunsab_port, port);
527 unsigned long flags;
528 unsigned char tmp;
529 int err = request_irq(up->port.irq, sunsab_interrupt,
530 IRQF_SHARED, "sab", up);
531 if (err)
532 return err;
533
534 spin_lock_irqsave(&up->port.lock, flags);
535
536 /*
537 * Wait for any commands or immediate characters
538 */
539 sunsab_cec_wait(up);
540 sunsab_tec_wait(up);
541
542 /*
543 * Clear the FIFO buffers.
544 */
545 writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr);
546 sunsab_cec_wait(up);
547 writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr);
548
549 /*
550 * Clear the interrupt registers.
551 */
552 (void) readb(&up->regs->r.isr0);
553 (void) readb(&up->regs->r.isr1);
554
555 /*
556 * Now, initialize the UART
557 */
558 writeb(0, &up->regs->w.ccr0); /* power-down */
559 writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ |
560 SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0);
561 writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1);
562 writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL |
563 SAB82532_CCR2_TOE, &up->regs->w.ccr2);
564 writeb(0, &up->regs->w.ccr3);
565 writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4);
566 up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS |
567 SAB82532_MODE_RAC);
568 writeb(up->cached_mode, &up->regs->w.mode);
569 writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc);
570
571 tmp = readb(&up->regs->rw.ccr0);
572 tmp |= SAB82532_CCR0_PU; /* power-up */
573 writeb(tmp, &up->regs->rw.ccr0);
574
575 /*
576 * Finally, enable interrupts
577 */
578 up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
579 SAB82532_IMR0_PLLA);
580 writeb(up->interrupt_mask0, &up->regs->w.imr0);
581 up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
582 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
583 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
584 SAB82532_IMR1_XPR);
585 writeb(up->interrupt_mask1, &up->regs->w.imr1);
586 set_bit(SAB82532_ALLS, &up->irqflags);
587 set_bit(SAB82532_XPR, &up->irqflags);
588
589 spin_unlock_irqrestore(&up->port.lock, flags);
590
591 return 0;
592 }
593
594 /* port->lock is not held. */
595 static void sunsab_shutdown(struct uart_port *port)
596 {
597 struct uart_sunsab_port *up =
598 container_of(port, struct uart_sunsab_port, port);
599 unsigned long flags;
600
601 spin_lock_irqsave(&up->port.lock, flags);
602
603 /* Disable Interrupts */
604 up->interrupt_mask0 = 0xff;
605 writeb(up->interrupt_mask0, &up->regs->w.imr0);
606 up->interrupt_mask1 = 0xff;
607 writeb(up->interrupt_mask1, &up->regs->w.imr1);
608
609 /* Disable break condition */
610 up->cached_dafo = readb(&up->regs->rw.dafo);
611 up->cached_dafo &= ~SAB82532_DAFO_XBRK;
612 writeb(up->cached_dafo, &up->regs->rw.dafo);
613
614 /* Disable Receiver */
615 up->cached_mode &= ~SAB82532_MODE_RAC;
616 writeb(up->cached_mode, &up->regs->rw.mode);
617
618 /*
619 * XXX FIXME
620 *
621 * If the chip is powered down here the system hangs/crashes during
622 * reboot or shutdown. This needs to be investigated further,
623 * similar behaviour occurs in 2.4 when the driver is configured
624 * as a module only. One hint may be that data is sometimes
625 * transmitted at 9600 baud during shutdown (regardless of the
626 * speed the chip was configured for when the port was open).
627 */
628 #if 0
629 /* Power Down */
630 tmp = readb(&up->regs->rw.ccr0);
631 tmp &= ~SAB82532_CCR0_PU;
632 writeb(tmp, &up->regs->rw.ccr0);
633 #endif
634
635 spin_unlock_irqrestore(&up->port.lock, flags);
636 free_irq(up->port.irq, up);
637 }
638
639 /*
640 * This is used to figure out the divisor speeds.
641 *
642 * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
643 *
644 * with 0 <= N < 64 and 0 <= M < 16
645 */
646
647 static void calc_ebrg(int baud, int *n_ret, int *m_ret)
648 {
649 int n, m;
650
651 if (baud == 0) {
652 *n_ret = 0;
653 *m_ret = 0;
654 return;
655 }
656
657 /*
658 * We scale numbers by 10 so that we get better accuracy
659 * without having to use floating point. Here we increment m
660 * until n is within the valid range.
661 */
662 n = (SAB_BASE_BAUD * 10) / baud;
663 m = 0;
664 while (n >= 640) {
665 n = n / 2;
666 m++;
667 }
668 n = (n+5) / 10;
669 /*
670 * We try very hard to avoid speeds with M == 0 since they may
671 * not work correctly for XTAL frequences above 10 MHz.
672 */
673 if ((m == 0) && ((n & 1) == 0)) {
674 n = n / 2;
675 m++;
676 }
677 *n_ret = n - 1;
678 *m_ret = m;
679 }
680
681 /* Internal routine, port->lock is held and local interrupts are disabled. */
682 static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag,
683 unsigned int iflag, unsigned int baud,
684 unsigned int quot)
685 {
686 unsigned char dafo;
687 int bits, n, m;
688
689 /* Byte size and parity */
690 switch (cflag & CSIZE) {
691 case CS5: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
692 case CS6: dafo = SAB82532_DAFO_CHL6; bits = 8; break;
693 case CS7: dafo = SAB82532_DAFO_CHL7; bits = 9; break;
694 case CS8: dafo = SAB82532_DAFO_CHL8; bits = 10; break;
695 /* Never happens, but GCC is too dumb to figure it out */
696 default: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
697 }
698
699 if (cflag & CSTOPB) {
700 dafo |= SAB82532_DAFO_STOP;
701 bits++;
702 }
703
704 if (cflag & PARENB) {
705 dafo |= SAB82532_DAFO_PARE;
706 bits++;
707 }
708
709 if (cflag & PARODD) {
710 dafo |= SAB82532_DAFO_PAR_ODD;
711 } else {
712 dafo |= SAB82532_DAFO_PAR_EVEN;
713 }
714 up->cached_dafo = dafo;
715
716 calc_ebrg(baud, &n, &m);
717
718 up->cached_ebrg = n | (m << 6);
719
720 up->tec_timeout = (10 * 1000000) / baud;
721 up->cec_timeout = up->tec_timeout >> 2;
722
723 /* CTS flow control flags */
724 /* We encode read_status_mask and ignore_status_mask like so:
725 *
726 * ---------------------
727 * | ... | ISR1 | ISR0 |
728 * ---------------------
729 * .. 15 8 7 0
730 */
731
732 up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
733 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF |
734 SAB82532_ISR0_CDSC);
735 up->port.read_status_mask |= (SAB82532_ISR1_CSC |
736 SAB82532_ISR1_ALLS |
737 SAB82532_ISR1_XPR) << 8;
738 if (iflag & INPCK)
739 up->port.read_status_mask |= (SAB82532_ISR0_PERR |
740 SAB82532_ISR0_FERR);
741 if (iflag & (IGNBRK | BRKINT | PARMRK))
742 up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);
743
744 /*
745 * Characteres to ignore
746 */
747 up->port.ignore_status_mask = 0;
748 if (iflag & IGNPAR)
749 up->port.ignore_status_mask |= (SAB82532_ISR0_PERR |
750 SAB82532_ISR0_FERR);
751 if (iflag & IGNBRK) {
752 up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8);
753 /*
754 * If we're ignoring parity and break indicators,
755 * ignore overruns too (for real raw support).
756 */
757 if (iflag & IGNPAR)
758 up->port.ignore_status_mask |= SAB82532_ISR0_RFO;
759 }
760
761 /*
762 * ignore all characters if CREAD is not set
763 */
764 if ((cflag & CREAD) == 0)
765 up->port.ignore_status_mask |= (SAB82532_ISR0_RPF |
766 SAB82532_ISR0_TCD);
767
768 uart_update_timeout(&up->port, cflag,
769 (up->port.uartclk / (16 * quot)));
770
771 /* Now schedule a register update when the chip's
772 * transmitter is idle.
773 */
774 up->cached_mode |= SAB82532_MODE_RAC;
775 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
776 if (test_bit(SAB82532_XPR, &up->irqflags))
777 sunsab_tx_idle(up);
778 }
779
780 /* port->lock is not held. */
781 static void sunsab_set_termios(struct uart_port *port, struct ktermios *termios,
782 struct ktermios *old)
783 {
784 struct uart_sunsab_port *up =
785 container_of(port, struct uart_sunsab_port, port);
786 unsigned long flags;
787 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
788 unsigned int quot = uart_get_divisor(port, baud);
789
790 spin_lock_irqsave(&up->port.lock, flags);
791 sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot);
792 spin_unlock_irqrestore(&up->port.lock, flags);
793 }
794
795 static const char *sunsab_type(struct uart_port *port)
796 {
797 struct uart_sunsab_port *up = (void *)port;
798 static char buf[36];
799
800 sprintf(buf, "SAB82532 %s", sab82532_version[up->type]);
801 return buf;
802 }
803
804 static void sunsab_release_port(struct uart_port *port)
805 {
806 }
807
808 static int sunsab_request_port(struct uart_port *port)
809 {
810 return 0;
811 }
812
813 static void sunsab_config_port(struct uart_port *port, int flags)
814 {
815 }
816
817 static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
818 {
819 return -EINVAL;
820 }
821
822 static struct uart_ops sunsab_pops = {
823 .tx_empty = sunsab_tx_empty,
824 .set_mctrl = sunsab_set_mctrl,
825 .get_mctrl = sunsab_get_mctrl,
826 .stop_tx = sunsab_stop_tx,
827 .start_tx = sunsab_start_tx,
828 .send_xchar = sunsab_send_xchar,
829 .stop_rx = sunsab_stop_rx,
830 .break_ctl = sunsab_break_ctl,
831 .startup = sunsab_startup,
832 .shutdown = sunsab_shutdown,
833 .set_termios = sunsab_set_termios,
834 .type = sunsab_type,
835 .release_port = sunsab_release_port,
836 .request_port = sunsab_request_port,
837 .config_port = sunsab_config_port,
838 .verify_port = sunsab_verify_port,
839 };
840
841 static struct uart_driver sunsab_reg = {
842 .owner = THIS_MODULE,
843 .driver_name = "sunsab",
844 .dev_name = "ttyS",
845 .major = TTY_MAJOR,
846 };
847
848 static struct uart_sunsab_port *sunsab_ports;
849
850 #ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
851
852 static void sunsab_console_putchar(struct uart_port *port, int c)
853 {
854 struct uart_sunsab_port *up =
855 container_of(port, struct uart_sunsab_port, port);
856
857 sunsab_tec_wait(up);
858 writeb(c, &up->regs->w.tic);
859 }
860
861 static void sunsab_console_write(struct console *con, const char *s, unsigned n)
862 {
863 struct uart_sunsab_port *up = &sunsab_ports[con->index];
864 unsigned long flags;
865 int locked = 1;
866
867 if (up->port.sysrq || oops_in_progress)
868 locked = spin_trylock_irqsave(&up->port.lock, flags);
869 else
870 spin_lock_irqsave(&up->port.lock, flags);
871
872 uart_console_write(&up->port, s, n, sunsab_console_putchar);
873 sunsab_tec_wait(up);
874
875 if (locked)
876 spin_unlock_irqrestore(&up->port.lock, flags);
877 }
878
879 static int sunsab_console_setup(struct console *con, char *options)
880 {
881 struct uart_sunsab_port *up = &sunsab_ports[con->index];
882 unsigned long flags;
883 unsigned int baud, quot;
884
885 /*
886 * The console framework calls us for each and every port
887 * registered. Defer the console setup until the requested
888 * port has been properly discovered. A bit of a hack,
889 * though...
890 */
891 if (up->port.type != PORT_SUNSAB)
892 return -1;
893
894 printk("Console: ttyS%d (SAB82532)\n",
895 (sunsab_reg.minor - 64) + con->index);
896
897 sunserial_console_termios(con, up->port.dev->of_node);
898
899 switch (con->cflag & CBAUD) {
900 case B150: baud = 150; break;
901 case B300: baud = 300; break;
902 case B600: baud = 600; break;
903 case B1200: baud = 1200; break;
904 case B2400: baud = 2400; break;
905 case B4800: baud = 4800; break;
906 default: case B9600: baud = 9600; break;
907 case B19200: baud = 19200; break;
908 case B38400: baud = 38400; break;
909 case B57600: baud = 57600; break;
910 case B115200: baud = 115200; break;
911 case B230400: baud = 230400; break;
912 case B460800: baud = 460800; break;
913 }
914
915 /*
916 * Temporary fix.
917 */
918 spin_lock_init(&up->port.lock);
919
920 /*
921 * Initialize the hardware
922 */
923 sunsab_startup(&up->port);
924
925 spin_lock_irqsave(&up->port.lock, flags);
926
927 /*
928 * Finally, enable interrupts
929 */
930 up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
931 SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC;
932 writeb(up->interrupt_mask0, &up->regs->w.imr0);
933 up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
934 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
935 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
936 SAB82532_IMR1_XPR;
937 writeb(up->interrupt_mask1, &up->regs->w.imr1);
938
939 quot = uart_get_divisor(&up->port, baud);
940 sunsab_convert_to_sab(up, con->cflag, 0, baud, quot);
941 sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
942
943 spin_unlock_irqrestore(&up->port.lock, flags);
944
945 return 0;
946 }
947
948 static struct console sunsab_console = {
949 .name = "ttyS",
950 .write = sunsab_console_write,
951 .device = uart_console_device,
952 .setup = sunsab_console_setup,
953 .flags = CON_PRINTBUFFER,
954 .index = -1,
955 .data = &sunsab_reg,
956 };
957
958 static inline struct console *SUNSAB_CONSOLE(void)
959 {
960 return &sunsab_console;
961 }
962 #else
963 #define SUNSAB_CONSOLE() (NULL)
964 #define sunsab_console_init() do { } while (0)
965 #endif
966
967 static int sunsab_init_one(struct uart_sunsab_port *up,
968 struct platform_device *op,
969 unsigned long offset,
970 int line)
971 {
972 up->port.line = line;
973 up->port.dev = &op->dev;
974
975 up->port.mapbase = op->resource[0].start + offset;
976 up->port.membase = of_ioremap(&op->resource[0], offset,
977 sizeof(union sab82532_async_regs),
978 "sab");
979 if (!up->port.membase)
980 return -ENOMEM;
981 up->regs = (union sab82532_async_regs __iomem *) up->port.membase;
982
983 up->port.irq = op->archdata.irqs[0];
984
985 up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
986 up->port.iotype = UPIO_MEM;
987
988 writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
989
990 up->port.ops = &sunsab_pops;
991 up->port.type = PORT_SUNSAB;
992 up->port.uartclk = SAB_BASE_BAUD;
993
994 up->type = readb(&up->regs->r.vstr) & 0x0f;
995 writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr);
996 writeb(0xff, &up->regs->w.pim);
997 if ((up->port.line & 0x1) == 0) {
998 up->pvr_dsr_bit = (1 << 0);
999 up->pvr_dtr_bit = (1 << 1);
1000 up->gis_shift = 2;
1001 } else {
1002 up->pvr_dsr_bit = (1 << 3);
1003 up->pvr_dtr_bit = (1 << 2);
1004 up->gis_shift = 0;
1005 }
1006 up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
1007 writeb(up->cached_pvr, &up->regs->w.pvr);
1008 up->cached_mode = readb(&up->regs->rw.mode);
1009 up->cached_mode |= SAB82532_MODE_FRTS;
1010 writeb(up->cached_mode, &up->regs->rw.mode);
1011 up->cached_mode |= SAB82532_MODE_RTS;
1012 writeb(up->cached_mode, &up->regs->rw.mode);
1013
1014 up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
1015 up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
1016
1017 return 0;
1018 }
1019
1020 static int sab_probe(struct platform_device *op)
1021 {
1022 static int inst;
1023 struct uart_sunsab_port *up;
1024 int err;
1025
1026 up = &sunsab_ports[inst * 2];
1027
1028 err = sunsab_init_one(&up[0], op,
1029 0,
1030 (inst * 2) + 0);
1031 if (err)
1032 goto out;
1033
1034 err = sunsab_init_one(&up[1], op,
1035 sizeof(union sab82532_async_regs),
1036 (inst * 2) + 1);
1037 if (err)
1038 goto out1;
1039
1040 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1041 &sunsab_reg, up[0].port.line,
1042 false);
1043
1044 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1045 &sunsab_reg, up[1].port.line,
1046 false);
1047
1048 err = uart_add_one_port(&sunsab_reg, &up[0].port);
1049 if (err)
1050 goto out2;
1051
1052 err = uart_add_one_port(&sunsab_reg, &up[1].port);
1053 if (err)
1054 goto out3;
1055
1056 platform_set_drvdata(op, &up[0]);
1057
1058 inst++;
1059
1060 return 0;
1061
1062 out3:
1063 uart_remove_one_port(&sunsab_reg, &up[0].port);
1064 out2:
1065 of_iounmap(&op->resource[0],
1066 up[1].port.membase,
1067 sizeof(union sab82532_async_regs));
1068 out1:
1069 of_iounmap(&op->resource[0],
1070 up[0].port.membase,
1071 sizeof(union sab82532_async_regs));
1072 out:
1073 return err;
1074 }
1075
1076 static int sab_remove(struct platform_device *op)
1077 {
1078 struct uart_sunsab_port *up = platform_get_drvdata(op);
1079
1080 uart_remove_one_port(&sunsab_reg, &up[1].port);
1081 uart_remove_one_port(&sunsab_reg, &up[0].port);
1082 of_iounmap(&op->resource[0],
1083 up[1].port.membase,
1084 sizeof(union sab82532_async_regs));
1085 of_iounmap(&op->resource[0],
1086 up[0].port.membase,
1087 sizeof(union sab82532_async_regs));
1088
1089 return 0;
1090 }
1091
1092 static const struct of_device_id sab_match[] = {
1093 {
1094 .name = "se",
1095 },
1096 {
1097 .name = "serial",
1098 .compatible = "sab82532",
1099 },
1100 {},
1101 };
1102 MODULE_DEVICE_TABLE(of, sab_match);
1103
1104 static struct platform_driver sab_driver = {
1105 .driver = {
1106 .name = "sab",
1107 .of_match_table = sab_match,
1108 },
1109 .probe = sab_probe,
1110 .remove = sab_remove,
1111 };
1112
1113 static int __init sunsab_init(void)
1114 {
1115 struct device_node *dp;
1116 int err;
1117 int num_channels = 0;
1118
1119 for_each_node_by_name(dp, "se")
1120 num_channels += 2;
1121 for_each_node_by_name(dp, "serial") {
1122 if (of_device_is_compatible(dp, "sab82532"))
1123 num_channels += 2;
1124 }
1125
1126 if (num_channels) {
1127 sunsab_ports = kzalloc(sizeof(struct uart_sunsab_port) *
1128 num_channels, GFP_KERNEL);
1129 if (!sunsab_ports)
1130 return -ENOMEM;
1131
1132 err = sunserial_register_minors(&sunsab_reg, num_channels);
1133 if (err) {
1134 kfree(sunsab_ports);
1135 sunsab_ports = NULL;
1136
1137 return err;
1138 }
1139 }
1140
1141 return platform_driver_register(&sab_driver);
1142 }
1143
1144 static void __exit sunsab_exit(void)
1145 {
1146 platform_driver_unregister(&sab_driver);
1147 if (sunsab_reg.nr) {
1148 sunserial_unregister_minors(&sunsab_reg, sunsab_reg.nr);
1149 }
1150
1151 kfree(sunsab_ports);
1152 sunsab_ports = NULL;
1153 }
1154
1155 module_init(sunsab_init);
1156 module_exit(sunsab_exit);
1157
1158 MODULE_AUTHOR("Eddie C. Dost and David S. Miller");
1159 MODULE_DESCRIPTION("Sun SAB82532 serial port driver");
1160 MODULE_LICENSE("GPL");
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