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1// SPDX-License-Identifier: GPL-2.0
2/* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC.
3 *
4 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 2002, 2006 David S. Miller (davem@davemloft.net)
6 *
7 * Rewrote buffer handling to use CIRC(Circular Buffer) macros.
8 * Maxim Krasnyanskiy <maxk@qualcomm.com>
9 *
10 * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
11 * rates to be programmed into the UART. Also eliminated a lot of
12 * duplicated code in the console setup.
13 * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
14 *
15 * Ported to new 2.5.x UART layer.
16 * David S. Miller <davem@davemloft.net>
17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/tty.h>
23#include <linux/tty_flip.h>
24#include <linux/major.h>
25#include <linux/string.h>
26#include <linux/ptrace.h>
27#include <linux/ioport.h>
28#include <linux/circ_buf.h>
29#include <linux/serial.h>
30#include <linux/sysrq.h>
31#include <linux/console.h>
32#include <linux/spinlock.h>
33#include <linux/slab.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/of.h>
37#include <linux/platform_device.h>
38
39#include <linux/io.h>
40#include <asm/irq.h>
41#include <asm/prom.h>
42#include <asm/setup.h>
43
44#include <linux/serial_core.h>
45#include <linux/sunserialcore.h>
46
47#include "sunsab.h"
48
49struct uart_sunsab_port {
50 struct uart_port port; /* Generic UART port */
51 union sab82532_async_regs __iomem *regs; /* Chip registers */
52 unsigned long irqflags; /* IRQ state flags */
53 int dsr; /* Current DSR state */
54 unsigned int cec_timeout; /* Chip poll timeout... */
55 unsigned int tec_timeout; /* likewise */
56 unsigned char interrupt_mask0;/* ISR0 masking */
57 unsigned char interrupt_mask1;/* ISR1 masking */
58 unsigned char pvr_dtr_bit; /* Which PVR bit is DTR */
59 unsigned char pvr_dsr_bit; /* Which PVR bit is DSR */
60 unsigned int gis_shift;
61 int type; /* SAB82532 version */
62
63 /* Setting configuration bits while the transmitter is active
64 * can cause garbage characters to get emitted by the chip.
65 * Therefore, we cache such writes here and do the real register
66 * write the next time the transmitter becomes idle.
67 */
68 unsigned int cached_ebrg;
69 unsigned char cached_mode;
70 unsigned char cached_pvr;
71 unsigned char cached_dafo;
72};
73
74/*
75 * This assumes you have a 29.4912 MHz clock for your UART.
76 */
77#define SAB_BASE_BAUD ( 29491200 / 16 )
78
79static char *sab82532_version[16] = {
80 "V1.0", "V2.0", "V3.2", "V(0x03)",
81 "V(0x04)", "V(0x05)", "V(0x06)", "V(0x07)",
82 "V(0x08)", "V(0x09)", "V(0x0a)", "V(0x0b)",
83 "V(0x0c)", "V(0x0d)", "V(0x0e)", "V(0x0f)"
84};
85
86#define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
87#define SAB82532_MAX_CEC_TIMEOUT 50000 /* 2.5 TX CLKs (at 50 baud) */
88
89#define SAB82532_RECV_FIFO_SIZE 32 /* Standard async fifo sizes */
90#define SAB82532_XMIT_FIFO_SIZE 32
91
92static __inline__ void sunsab_tec_wait(struct uart_sunsab_port *up)
93{
94 int timeout = up->tec_timeout;
95
96 while ((readb(&up->regs->r.star) & SAB82532_STAR_TEC) && --timeout)
97 udelay(1);
98}
99
100static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
101{
102 int timeout = up->cec_timeout;
103
104 while ((readb(&up->regs->r.star) & SAB82532_STAR_CEC) && --timeout)
105 udelay(1);
106}
107
108static struct tty_port *
109receive_chars(struct uart_sunsab_port *up,
110 union sab82532_irq_status *stat)
111{
112 struct tty_port *port = NULL;
113 unsigned char buf[32];
114 int saw_console_brk = 0;
115 int free_fifo = 0;
116 int count = 0;
117 int i;
118
119 if (up->port.state != NULL) /* Unopened serial console */
120 port = &up->port.state->port;
121
122 /* Read number of BYTES (Character + Status) available. */
123 if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
124 count = SAB82532_RECV_FIFO_SIZE;
125 free_fifo++;
126 }
127
128 if (stat->sreg.isr0 & SAB82532_ISR0_TCD) {
129 count = readb(&up->regs->r.rbcl) & (SAB82532_RECV_FIFO_SIZE - 1);
130 free_fifo++;
131 }
132
133 /* Issue a FIFO read command in case we where idle. */
134 if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
135 sunsab_cec_wait(up);
136 writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
137 return port;
138 }
139
140 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
141 free_fifo++;
142
143 /* Read the FIFO. */
144 for (i = 0; i < count; i++)
145 buf[i] = readb(&up->regs->r.rfifo[i]);
146
147 /* Issue Receive Message Complete command. */
148 if (free_fifo) {
149 sunsab_cec_wait(up);
150 writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr);
151 }
152
153 /* Count may be zero for BRK, so we check for it here */
154 if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
155 (up->port.line == up->port.cons->index))
156 saw_console_brk = 1;
157
158 if (count == 0) {
159 if (unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
160 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
161 SAB82532_ISR0_FERR);
162 up->port.icount.brk++;
163 uart_handle_break(&up->port);
164 }
165 }
166
167 for (i = 0; i < count; i++) {
168 unsigned char ch = buf[i], flag;
169
170 flag = TTY_NORMAL;
171 up->port.icount.rx++;
172
173 if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR |
174 SAB82532_ISR0_FERR |
175 SAB82532_ISR0_RFO)) ||
176 unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
177 /*
178 * For statistics only
179 */
180 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
181 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
182 SAB82532_ISR0_FERR);
183 up->port.icount.brk++;
184 /*
185 * We do the SysRQ and SAK checking
186 * here because otherwise the break
187 * may get masked by ignore_status_mask
188 * or read_status_mask.
189 */
190 if (uart_handle_break(&up->port))
191 continue;
192 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
193 up->port.icount.parity++;
194 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
195 up->port.icount.frame++;
196 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
197 up->port.icount.overrun++;
198
199 /*
200 * Mask off conditions which should be ingored.
201 */
202 stat->sreg.isr0 &= (up->port.read_status_mask & 0xff);
203 stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff);
204
205 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
206 flag = TTY_BREAK;
207 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
208 flag = TTY_PARITY;
209 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
210 flag = TTY_FRAME;
211 }
212
213 if (uart_handle_sysrq_char(&up->port, ch) || !port)
214 continue;
215
216 if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
217 (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0)
218 tty_insert_flip_char(port, ch, flag);
219 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
220 tty_insert_flip_char(port, 0, TTY_OVERRUN);
221 }
222
223 if (saw_console_brk)
224 sun_do_break();
225
226 return port;
227}
228
229static void sunsab_stop_tx(struct uart_port *);
230static void sunsab_tx_idle(struct uart_sunsab_port *);
231
232static void transmit_chars(struct uart_sunsab_port *up,
233 union sab82532_irq_status *stat)
234{
235 struct circ_buf *xmit = &up->port.state->xmit;
236 int i;
237
238 if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
239 up->interrupt_mask1 |= SAB82532_IMR1_ALLS;
240 writeb(up->interrupt_mask1, &up->regs->w.imr1);
241 set_bit(SAB82532_ALLS, &up->irqflags);
242 }
243
244#if 0 /* bde@nwlink.com says this check causes problems */
245 if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR))
246 return;
247#endif
248
249 if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW))
250 return;
251
252 set_bit(SAB82532_XPR, &up->irqflags);
253 sunsab_tx_idle(up);
254
255 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
256 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
257 writeb(up->interrupt_mask1, &up->regs->w.imr1);
258 return;
259 }
260
261 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
262 writeb(up->interrupt_mask1, &up->regs->w.imr1);
263 clear_bit(SAB82532_ALLS, &up->irqflags);
264
265 /* Stuff 32 bytes into Transmit FIFO. */
266 clear_bit(SAB82532_XPR, &up->irqflags);
267 for (i = 0; i < up->port.fifosize; i++) {
268 writeb(xmit->buf[xmit->tail],
269 &up->regs->w.xfifo[i]);
270 uart_xmit_advance(&up->port, 1);
271 if (uart_circ_empty(xmit))
272 break;
273 }
274
275 /* Issue a Transmit Frame command. */
276 sunsab_cec_wait(up);
277 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
278
279 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
280 uart_write_wakeup(&up->port);
281
282 if (uart_circ_empty(xmit))
283 sunsab_stop_tx(&up->port);
284}
285
286static void check_status(struct uart_sunsab_port *up,
287 union sab82532_irq_status *stat)
288{
289 if (stat->sreg.isr0 & SAB82532_ISR0_CDSC)
290 uart_handle_dcd_change(&up->port,
291 !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD));
292
293 if (stat->sreg.isr1 & SAB82532_ISR1_CSC)
294 uart_handle_cts_change(&up->port,
295 (readb(&up->regs->r.star) & SAB82532_STAR_CTS));
296
297 if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) {
298 up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1;
299 up->port.icount.dsr++;
300 }
301
302 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
303}
304
305static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
306{
307 struct uart_sunsab_port *up = dev_id;
308 struct tty_port *port = NULL;
309 union sab82532_irq_status status;
310 unsigned long flags;
311 unsigned char gis;
312
313 uart_port_lock_irqsave(&up->port, &flags);
314
315 status.stat = 0;
316 gis = readb(&up->regs->r.gis) >> up->gis_shift;
317 if (gis & 1)
318 status.sreg.isr0 = readb(&up->regs->r.isr0);
319 if (gis & 2)
320 status.sreg.isr1 = readb(&up->regs->r.isr1);
321
322 if (status.stat) {
323 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
324 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
325 (status.sreg.isr1 & SAB82532_ISR1_BRK))
326 port = receive_chars(up, &status);
327 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
328 (status.sreg.isr1 & SAB82532_ISR1_CSC))
329 check_status(up, &status);
330 if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
331 transmit_chars(up, &status);
332 }
333
334 uart_port_unlock_irqrestore(&up->port, flags);
335
336 if (port)
337 tty_flip_buffer_push(port);
338
339 return IRQ_HANDLED;
340}
341
342/* port->lock is not held. */
343static unsigned int sunsab_tx_empty(struct uart_port *port)
344{
345 struct uart_sunsab_port *up =
346 container_of(port, struct uart_sunsab_port, port);
347 int ret;
348
349 /* Do not need a lock for a state test like this. */
350 if (test_bit(SAB82532_ALLS, &up->irqflags))
351 ret = TIOCSER_TEMT;
352 else
353 ret = 0;
354
355 return ret;
356}
357
358/* port->lock held by caller. */
359static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
360{
361 struct uart_sunsab_port *up =
362 container_of(port, struct uart_sunsab_port, port);
363
364 if (mctrl & TIOCM_RTS) {
365 up->cached_mode &= ~SAB82532_MODE_FRTS;
366 up->cached_mode |= SAB82532_MODE_RTS;
367 } else {
368 up->cached_mode |= (SAB82532_MODE_FRTS |
369 SAB82532_MODE_RTS);
370 }
371 if (mctrl & TIOCM_DTR) {
372 up->cached_pvr &= ~(up->pvr_dtr_bit);
373 } else {
374 up->cached_pvr |= up->pvr_dtr_bit;
375 }
376
377 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
378 if (test_bit(SAB82532_XPR, &up->irqflags))
379 sunsab_tx_idle(up);
380}
381
382/* port->lock is held by caller and interrupts are disabled. */
383static unsigned int sunsab_get_mctrl(struct uart_port *port)
384{
385 struct uart_sunsab_port *up =
386 container_of(port, struct uart_sunsab_port, port);
387 unsigned char val;
388 unsigned int result;
389
390 result = 0;
391
392 val = readb(&up->regs->r.pvr);
393 result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
394
395 val = readb(&up->regs->r.vstr);
396 result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR;
397
398 val = readb(&up->regs->r.star);
399 result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
400
401 return result;
402}
403
404/* port->lock held by caller. */
405static void sunsab_stop_tx(struct uart_port *port)
406{
407 struct uart_sunsab_port *up =
408 container_of(port, struct uart_sunsab_port, port);
409
410 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
411 writeb(up->interrupt_mask1, &up->regs->w.imr1);
412}
413
414/* port->lock held by caller. */
415static void sunsab_tx_idle(struct uart_sunsab_port *up)
416{
417 if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) {
418 u8 tmp;
419
420 clear_bit(SAB82532_REGS_PENDING, &up->irqflags);
421 writeb(up->cached_mode, &up->regs->rw.mode);
422 writeb(up->cached_pvr, &up->regs->rw.pvr);
423 writeb(up->cached_dafo, &up->regs->w.dafo);
424
425 writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr);
426 tmp = readb(&up->regs->rw.ccr2);
427 tmp &= ~0xc0;
428 tmp |= (up->cached_ebrg >> 2) & 0xc0;
429 writeb(tmp, &up->regs->rw.ccr2);
430 }
431}
432
433/* port->lock held by caller. */
434static void sunsab_start_tx(struct uart_port *port)
435{
436 struct uart_sunsab_port *up =
437 container_of(port, struct uart_sunsab_port, port);
438 struct circ_buf *xmit = &up->port.state->xmit;
439 int i;
440
441 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
442 return;
443
444 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
445 writeb(up->interrupt_mask1, &up->regs->w.imr1);
446
447 if (!test_bit(SAB82532_XPR, &up->irqflags))
448 return;
449
450 clear_bit(SAB82532_ALLS, &up->irqflags);
451 clear_bit(SAB82532_XPR, &up->irqflags);
452
453 for (i = 0; i < up->port.fifosize; i++) {
454 writeb(xmit->buf[xmit->tail],
455 &up->regs->w.xfifo[i]);
456 uart_xmit_advance(&up->port, 1);
457 if (uart_circ_empty(xmit))
458 break;
459 }
460
461 /* Issue a Transmit Frame command. */
462 sunsab_cec_wait(up);
463 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
464}
465
466/* port->lock is not held. */
467static void sunsab_send_xchar(struct uart_port *port, char ch)
468{
469 struct uart_sunsab_port *up =
470 container_of(port, struct uart_sunsab_port, port);
471 unsigned long flags;
472
473 if (ch == __DISABLED_CHAR)
474 return;
475
476 uart_port_lock_irqsave(&up->port, &flags);
477
478 sunsab_tec_wait(up);
479 writeb(ch, &up->regs->w.tic);
480
481 uart_port_unlock_irqrestore(&up->port, flags);
482}
483
484/* port->lock held by caller. */
485static void sunsab_stop_rx(struct uart_port *port)
486{
487 struct uart_sunsab_port *up =
488 container_of(port, struct uart_sunsab_port, port);
489
490 up->interrupt_mask0 |= SAB82532_IMR0_TCD;
491 writeb(up->interrupt_mask1, &up->regs->w.imr0);
492}
493
494/* port->lock is not held. */
495static void sunsab_break_ctl(struct uart_port *port, int break_state)
496{
497 struct uart_sunsab_port *up =
498 container_of(port, struct uart_sunsab_port, port);
499 unsigned long flags;
500 unsigned char val;
501
502 uart_port_lock_irqsave(&up->port, &flags);
503
504 val = up->cached_dafo;
505 if (break_state)
506 val |= SAB82532_DAFO_XBRK;
507 else
508 val &= ~SAB82532_DAFO_XBRK;
509 up->cached_dafo = val;
510
511 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
512 if (test_bit(SAB82532_XPR, &up->irqflags))
513 sunsab_tx_idle(up);
514
515 uart_port_unlock_irqrestore(&up->port, flags);
516}
517
518/* port->lock is not held. */
519static int sunsab_startup(struct uart_port *port)
520{
521 struct uart_sunsab_port *up =
522 container_of(port, struct uart_sunsab_port, port);
523 unsigned long flags;
524 unsigned char tmp;
525 int err = request_irq(up->port.irq, sunsab_interrupt,
526 IRQF_SHARED, "sab", up);
527 if (err)
528 return err;
529
530 uart_port_lock_irqsave(&up->port, &flags);
531
532 /*
533 * Wait for any commands or immediate characters
534 */
535 sunsab_cec_wait(up);
536 sunsab_tec_wait(up);
537
538 /*
539 * Clear the FIFO buffers.
540 */
541 writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr);
542 sunsab_cec_wait(up);
543 writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr);
544
545 /*
546 * Clear the interrupt registers.
547 */
548 (void) readb(&up->regs->r.isr0);
549 (void) readb(&up->regs->r.isr1);
550
551 /*
552 * Now, initialize the UART
553 */
554 writeb(0, &up->regs->w.ccr0); /* power-down */
555 writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ |
556 SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0);
557 writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1);
558 writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL |
559 SAB82532_CCR2_TOE, &up->regs->w.ccr2);
560 writeb(0, &up->regs->w.ccr3);
561 writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4);
562 up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS |
563 SAB82532_MODE_RAC);
564 writeb(up->cached_mode, &up->regs->w.mode);
565 writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc);
566
567 tmp = readb(&up->regs->rw.ccr0);
568 tmp |= SAB82532_CCR0_PU; /* power-up */
569 writeb(tmp, &up->regs->rw.ccr0);
570
571 /*
572 * Finally, enable interrupts
573 */
574 up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
575 SAB82532_IMR0_PLLA);
576 writeb(up->interrupt_mask0, &up->regs->w.imr0);
577 up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
578 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
579 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
580 SAB82532_IMR1_XPR);
581 writeb(up->interrupt_mask1, &up->regs->w.imr1);
582 set_bit(SAB82532_ALLS, &up->irqflags);
583 set_bit(SAB82532_XPR, &up->irqflags);
584
585 uart_port_unlock_irqrestore(&up->port, flags);
586
587 return 0;
588}
589
590/* port->lock is not held. */
591static void sunsab_shutdown(struct uart_port *port)
592{
593 struct uart_sunsab_port *up =
594 container_of(port, struct uart_sunsab_port, port);
595 unsigned long flags;
596
597 uart_port_lock_irqsave(&up->port, &flags);
598
599 /* Disable Interrupts */
600 up->interrupt_mask0 = 0xff;
601 writeb(up->interrupt_mask0, &up->regs->w.imr0);
602 up->interrupt_mask1 = 0xff;
603 writeb(up->interrupt_mask1, &up->regs->w.imr1);
604
605 /* Disable break condition */
606 up->cached_dafo = readb(&up->regs->rw.dafo);
607 up->cached_dafo &= ~SAB82532_DAFO_XBRK;
608 writeb(up->cached_dafo, &up->regs->rw.dafo);
609
610 /* Disable Receiver */
611 up->cached_mode &= ~SAB82532_MODE_RAC;
612 writeb(up->cached_mode, &up->regs->rw.mode);
613
614 /*
615 * XXX FIXME
616 *
617 * If the chip is powered down here the system hangs/crashes during
618 * reboot or shutdown. This needs to be investigated further,
619 * similar behaviour occurs in 2.4 when the driver is configured
620 * as a module only. One hint may be that data is sometimes
621 * transmitted at 9600 baud during shutdown (regardless of the
622 * speed the chip was configured for when the port was open).
623 */
624#if 0
625 /* Power Down */
626 tmp = readb(&up->regs->rw.ccr0);
627 tmp &= ~SAB82532_CCR0_PU;
628 writeb(tmp, &up->regs->rw.ccr0);
629#endif
630
631 uart_port_unlock_irqrestore(&up->port, flags);
632 free_irq(up->port.irq, up);
633}
634
635/*
636 * This is used to figure out the divisor speeds.
637 *
638 * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
639 *
640 * with 0 <= N < 64 and 0 <= M < 16
641 */
642
643static void calc_ebrg(int baud, int *n_ret, int *m_ret)
644{
645 int n, m;
646
647 if (baud == 0) {
648 *n_ret = 0;
649 *m_ret = 0;
650 return;
651 }
652
653 /*
654 * We scale numbers by 10 so that we get better accuracy
655 * without having to use floating point. Here we increment m
656 * until n is within the valid range.
657 */
658 n = (SAB_BASE_BAUD * 10) / baud;
659 m = 0;
660 while (n >= 640) {
661 n = n / 2;
662 m++;
663 }
664 n = (n+5) / 10;
665 /*
666 * We try very hard to avoid speeds with M == 0 since they may
667 * not work correctly for XTAL frequences above 10 MHz.
668 */
669 if ((m == 0) && ((n & 1) == 0)) {
670 n = n / 2;
671 m++;
672 }
673 *n_ret = n - 1;
674 *m_ret = m;
675}
676
677/* Internal routine, port->lock is held and local interrupts are disabled. */
678static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag,
679 unsigned int iflag, unsigned int baud,
680 unsigned int quot)
681{
682 unsigned char dafo;
683 int n, m;
684
685 /* Byte size and parity */
686 switch (cflag & CSIZE) {
687 case CS5: dafo = SAB82532_DAFO_CHL5; break;
688 case CS6: dafo = SAB82532_DAFO_CHL6; break;
689 case CS7: dafo = SAB82532_DAFO_CHL7; break;
690 case CS8: dafo = SAB82532_DAFO_CHL8; break;
691 /* Never happens, but GCC is too dumb to figure it out */
692 default: dafo = SAB82532_DAFO_CHL5; break;
693 }
694
695 if (cflag & CSTOPB)
696 dafo |= SAB82532_DAFO_STOP;
697
698 if (cflag & PARENB)
699 dafo |= SAB82532_DAFO_PARE;
700
701 if (cflag & PARODD) {
702 dafo |= SAB82532_DAFO_PAR_ODD;
703 } else {
704 dafo |= SAB82532_DAFO_PAR_EVEN;
705 }
706 up->cached_dafo = dafo;
707
708 calc_ebrg(baud, &n, &m);
709
710 up->cached_ebrg = n | (m << 6);
711
712 up->tec_timeout = (10 * 1000000) / baud;
713 up->cec_timeout = up->tec_timeout >> 2;
714
715 /* CTS flow control flags */
716 /* We encode read_status_mask and ignore_status_mask like so:
717 *
718 * ---------------------
719 * | ... | ISR1 | ISR0 |
720 * ---------------------
721 * .. 15 8 7 0
722 */
723
724 up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
725 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF |
726 SAB82532_ISR0_CDSC);
727 up->port.read_status_mask |= (SAB82532_ISR1_CSC |
728 SAB82532_ISR1_ALLS |
729 SAB82532_ISR1_XPR) << 8;
730 if (iflag & INPCK)
731 up->port.read_status_mask |= (SAB82532_ISR0_PERR |
732 SAB82532_ISR0_FERR);
733 if (iflag & (IGNBRK | BRKINT | PARMRK))
734 up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);
735
736 /*
737 * Characteres to ignore
738 */
739 up->port.ignore_status_mask = 0;
740 if (iflag & IGNPAR)
741 up->port.ignore_status_mask |= (SAB82532_ISR0_PERR |
742 SAB82532_ISR0_FERR);
743 if (iflag & IGNBRK) {
744 up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8);
745 /*
746 * If we're ignoring parity and break indicators,
747 * ignore overruns too (for real raw support).
748 */
749 if (iflag & IGNPAR)
750 up->port.ignore_status_mask |= SAB82532_ISR0_RFO;
751 }
752
753 /*
754 * ignore all characters if CREAD is not set
755 */
756 if ((cflag & CREAD) == 0)
757 up->port.ignore_status_mask |= (SAB82532_ISR0_RPF |
758 SAB82532_ISR0_TCD);
759
760 uart_update_timeout(&up->port, cflag,
761 (up->port.uartclk / (16 * quot)));
762
763 /* Now schedule a register update when the chip's
764 * transmitter is idle.
765 */
766 up->cached_mode |= SAB82532_MODE_RAC;
767 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
768 if (test_bit(SAB82532_XPR, &up->irqflags))
769 sunsab_tx_idle(up);
770}
771
772/* port->lock is not held. */
773static void sunsab_set_termios(struct uart_port *port, struct ktermios *termios,
774 const struct ktermios *old)
775{
776 struct uart_sunsab_port *up =
777 container_of(port, struct uart_sunsab_port, port);
778 unsigned long flags;
779 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
780 unsigned int quot = uart_get_divisor(port, baud);
781
782 uart_port_lock_irqsave(&up->port, &flags);
783 sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot);
784 uart_port_unlock_irqrestore(&up->port, flags);
785}
786
787static const char *sunsab_type(struct uart_port *port)
788{
789 struct uart_sunsab_port *up = (void *)port;
790 static char buf[36];
791
792 sprintf(buf, "SAB82532 %s", sab82532_version[up->type]);
793 return buf;
794}
795
796static void sunsab_release_port(struct uart_port *port)
797{
798}
799
800static int sunsab_request_port(struct uart_port *port)
801{
802 return 0;
803}
804
805static void sunsab_config_port(struct uart_port *port, int flags)
806{
807}
808
809static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
810{
811 return -EINVAL;
812}
813
814static const struct uart_ops sunsab_pops = {
815 .tx_empty = sunsab_tx_empty,
816 .set_mctrl = sunsab_set_mctrl,
817 .get_mctrl = sunsab_get_mctrl,
818 .stop_tx = sunsab_stop_tx,
819 .start_tx = sunsab_start_tx,
820 .send_xchar = sunsab_send_xchar,
821 .stop_rx = sunsab_stop_rx,
822 .break_ctl = sunsab_break_ctl,
823 .startup = sunsab_startup,
824 .shutdown = sunsab_shutdown,
825 .set_termios = sunsab_set_termios,
826 .type = sunsab_type,
827 .release_port = sunsab_release_port,
828 .request_port = sunsab_request_port,
829 .config_port = sunsab_config_port,
830 .verify_port = sunsab_verify_port,
831};
832
833static struct uart_driver sunsab_reg = {
834 .owner = THIS_MODULE,
835 .driver_name = "sunsab",
836 .dev_name = "ttyS",
837 .major = TTY_MAJOR,
838};
839
840static struct uart_sunsab_port *sunsab_ports;
841
842#ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
843
844static void sunsab_console_putchar(struct uart_port *port, unsigned char c)
845{
846 struct uart_sunsab_port *up =
847 container_of(port, struct uart_sunsab_port, port);
848
849 sunsab_tec_wait(up);
850 writeb(c, &up->regs->w.tic);
851}
852
853static void sunsab_console_write(struct console *con, const char *s, unsigned n)
854{
855 struct uart_sunsab_port *up = &sunsab_ports[con->index];
856 unsigned long flags;
857 int locked = 1;
858
859 if (up->port.sysrq || oops_in_progress)
860 locked = uart_port_trylock_irqsave(&up->port, &flags);
861 else
862 uart_port_lock_irqsave(&up->port, &flags);
863
864 uart_console_write(&up->port, s, n, sunsab_console_putchar);
865 sunsab_tec_wait(up);
866
867 if (locked)
868 uart_port_unlock_irqrestore(&up->port, flags);
869}
870
871static int sunsab_console_setup(struct console *con, char *options)
872{
873 struct uart_sunsab_port *up = &sunsab_ports[con->index];
874 unsigned long flags;
875 unsigned int baud, quot;
876
877 /*
878 * The console framework calls us for each and every port
879 * registered. Defer the console setup until the requested
880 * port has been properly discovered. A bit of a hack,
881 * though...
882 */
883 if (up->port.type != PORT_SUNSAB)
884 return -EINVAL;
885
886 printk("Console: ttyS%d (SAB82532)\n",
887 (sunsab_reg.minor - 64) + con->index);
888
889 sunserial_console_termios(con, up->port.dev->of_node);
890
891 switch (con->cflag & CBAUD) {
892 case B150: baud = 150; break;
893 case B300: baud = 300; break;
894 case B600: baud = 600; break;
895 case B1200: baud = 1200; break;
896 case B2400: baud = 2400; break;
897 case B4800: baud = 4800; break;
898 default: case B9600: baud = 9600; break;
899 case B19200: baud = 19200; break;
900 case B38400: baud = 38400; break;
901 case B57600: baud = 57600; break;
902 case B115200: baud = 115200; break;
903 case B230400: baud = 230400; break;
904 case B460800: baud = 460800; break;
905 }
906
907 /*
908 * Temporary fix.
909 */
910 spin_lock_init(&up->port.lock);
911
912 /*
913 * Initialize the hardware
914 */
915 sunsab_startup(&up->port);
916
917 uart_port_lock_irqsave(&up->port, &flags);
918
919 /*
920 * Finally, enable interrupts
921 */
922 up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
923 SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC;
924 writeb(up->interrupt_mask0, &up->regs->w.imr0);
925 up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
926 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
927 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
928 SAB82532_IMR1_XPR;
929 writeb(up->interrupt_mask1, &up->regs->w.imr1);
930
931 quot = uart_get_divisor(&up->port, baud);
932 sunsab_convert_to_sab(up, con->cflag, 0, baud, quot);
933 sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
934
935 uart_port_unlock_irqrestore(&up->port, flags);
936
937 return 0;
938}
939
940static struct console sunsab_console = {
941 .name = "ttyS",
942 .write = sunsab_console_write,
943 .device = uart_console_device,
944 .setup = sunsab_console_setup,
945 .flags = CON_PRINTBUFFER,
946 .index = -1,
947 .data = &sunsab_reg,
948};
949
950static inline struct console *SUNSAB_CONSOLE(void)
951{
952 return &sunsab_console;
953}
954#else
955#define SUNSAB_CONSOLE() (NULL)
956#define sunsab_console_init() do { } while (0)
957#endif
958
959static int sunsab_init_one(struct uart_sunsab_port *up,
960 struct platform_device *op,
961 unsigned long offset,
962 int line)
963{
964 up->port.line = line;
965 up->port.dev = &op->dev;
966
967 up->port.mapbase = op->resource[0].start + offset;
968 up->port.membase = of_ioremap(&op->resource[0], offset,
969 sizeof(union sab82532_async_regs),
970 "sab");
971 if (!up->port.membase)
972 return -ENOMEM;
973 up->regs = (union sab82532_async_regs __iomem *) up->port.membase;
974
975 up->port.irq = op->archdata.irqs[0];
976
977 up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
978 up->port.iotype = UPIO_MEM;
979 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSAB_CONSOLE);
980
981 writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
982
983 up->port.ops = &sunsab_pops;
984 up->port.type = PORT_SUNSAB;
985 up->port.uartclk = SAB_BASE_BAUD;
986
987 up->type = readb(&up->regs->r.vstr) & 0x0f;
988 writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr);
989 writeb(0xff, &up->regs->w.pim);
990 if ((up->port.line & 0x1) == 0) {
991 up->pvr_dsr_bit = (1 << 0);
992 up->pvr_dtr_bit = (1 << 1);
993 up->gis_shift = 2;
994 } else {
995 up->pvr_dsr_bit = (1 << 3);
996 up->pvr_dtr_bit = (1 << 2);
997 up->gis_shift = 0;
998 }
999 up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
1000 writeb(up->cached_pvr, &up->regs->w.pvr);
1001 up->cached_mode = readb(&up->regs->rw.mode);
1002 up->cached_mode |= SAB82532_MODE_FRTS;
1003 writeb(up->cached_mode, &up->regs->rw.mode);
1004 up->cached_mode |= SAB82532_MODE_RTS;
1005 writeb(up->cached_mode, &up->regs->rw.mode);
1006
1007 up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
1008 up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
1009
1010 return 0;
1011}
1012
1013static int sab_probe(struct platform_device *op)
1014{
1015 static int inst;
1016 struct uart_sunsab_port *up;
1017 int err;
1018
1019 up = &sunsab_ports[inst * 2];
1020
1021 err = sunsab_init_one(&up[0], op,
1022 0,
1023 (inst * 2) + 0);
1024 if (err)
1025 goto out;
1026
1027 err = sunsab_init_one(&up[1], op,
1028 sizeof(union sab82532_async_regs),
1029 (inst * 2) + 1);
1030 if (err)
1031 goto out1;
1032
1033 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1034 &sunsab_reg, up[0].port.line,
1035 false);
1036
1037 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1038 &sunsab_reg, up[1].port.line,
1039 false);
1040
1041 err = uart_add_one_port(&sunsab_reg, &up[0].port);
1042 if (err)
1043 goto out2;
1044
1045 err = uart_add_one_port(&sunsab_reg, &up[1].port);
1046 if (err)
1047 goto out3;
1048
1049 platform_set_drvdata(op, &up[0]);
1050
1051 inst++;
1052
1053 return 0;
1054
1055out3:
1056 uart_remove_one_port(&sunsab_reg, &up[0].port);
1057out2:
1058 of_iounmap(&op->resource[0],
1059 up[1].port.membase,
1060 sizeof(union sab82532_async_regs));
1061out1:
1062 of_iounmap(&op->resource[0],
1063 up[0].port.membase,
1064 sizeof(union sab82532_async_regs));
1065out:
1066 return err;
1067}
1068
1069static void sab_remove(struct platform_device *op)
1070{
1071 struct uart_sunsab_port *up = platform_get_drvdata(op);
1072
1073 uart_remove_one_port(&sunsab_reg, &up[1].port);
1074 uart_remove_one_port(&sunsab_reg, &up[0].port);
1075 of_iounmap(&op->resource[0],
1076 up[1].port.membase,
1077 sizeof(union sab82532_async_regs));
1078 of_iounmap(&op->resource[0],
1079 up[0].port.membase,
1080 sizeof(union sab82532_async_regs));
1081}
1082
1083static const struct of_device_id sab_match[] = {
1084 {
1085 .name = "se",
1086 },
1087 {
1088 .name = "serial",
1089 .compatible = "sab82532",
1090 },
1091 {},
1092};
1093MODULE_DEVICE_TABLE(of, sab_match);
1094
1095static struct platform_driver sab_driver = {
1096 .driver = {
1097 .name = "sab",
1098 .of_match_table = sab_match,
1099 },
1100 .probe = sab_probe,
1101 .remove_new = sab_remove,
1102};
1103
1104static int __init sunsab_init(void)
1105{
1106 struct device_node *dp;
1107 int err;
1108 int num_channels = 0;
1109
1110 for_each_node_by_name(dp, "se")
1111 num_channels += 2;
1112 for_each_node_by_name(dp, "serial") {
1113 if (of_device_is_compatible(dp, "sab82532"))
1114 num_channels += 2;
1115 }
1116
1117 if (num_channels) {
1118 sunsab_ports = kcalloc(num_channels,
1119 sizeof(struct uart_sunsab_port),
1120 GFP_KERNEL);
1121 if (!sunsab_ports)
1122 return -ENOMEM;
1123
1124 err = sunserial_register_minors(&sunsab_reg, num_channels);
1125 if (err) {
1126 kfree(sunsab_ports);
1127 sunsab_ports = NULL;
1128
1129 return err;
1130 }
1131 }
1132
1133 err = platform_driver_register(&sab_driver);
1134 if (err) {
1135 kfree(sunsab_ports);
1136 sunsab_ports = NULL;
1137 }
1138
1139 return err;
1140}
1141
1142static void __exit sunsab_exit(void)
1143{
1144 platform_driver_unregister(&sab_driver);
1145 if (sunsab_reg.nr) {
1146 sunserial_unregister_minors(&sunsab_reg, sunsab_reg.nr);
1147 }
1148
1149 kfree(sunsab_ports);
1150 sunsab_ports = NULL;
1151}
1152
1153module_init(sunsab_init);
1154module_exit(sunsab_exit);
1155
1156MODULE_AUTHOR("Eddie C. Dost and David S. Miller");
1157MODULE_DESCRIPTION("Sun SAB82532 serial port driver");
1158MODULE_LICENSE("GPL");
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
51struct 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
81static 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
94static __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
102static __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
110static struct tty_port *
111receive_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 for (i = 0; i < count; i++) {
161 unsigned char ch = buf[i], flag;
162
163 flag = TTY_NORMAL;
164 up->port.icount.rx++;
165
166 if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR |
167 SAB82532_ISR0_FERR |
168 SAB82532_ISR0_RFO)) ||
169 unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
170 /*
171 * For statistics only
172 */
173 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
174 stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
175 SAB82532_ISR0_FERR);
176 up->port.icount.brk++;
177 /*
178 * We do the SysRQ and SAK checking
179 * here because otherwise the break
180 * may get masked by ignore_status_mask
181 * or read_status_mask.
182 */
183 if (uart_handle_break(&up->port))
184 continue;
185 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
186 up->port.icount.parity++;
187 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
188 up->port.icount.frame++;
189 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
190 up->port.icount.overrun++;
191
192 /*
193 * Mask off conditions which should be ingored.
194 */
195 stat->sreg.isr0 &= (up->port.read_status_mask & 0xff);
196 stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff);
197
198 if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
199 flag = TTY_BREAK;
200 } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
201 flag = TTY_PARITY;
202 else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
203 flag = TTY_FRAME;
204 }
205
206 if (uart_handle_sysrq_char(&up->port, ch) || !port)
207 continue;
208
209 if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
210 (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0)
211 tty_insert_flip_char(port, ch, flag);
212 if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
213 tty_insert_flip_char(port, 0, TTY_OVERRUN);
214 }
215
216 if (saw_console_brk)
217 sun_do_break();
218
219 return port;
220}
221
222static void sunsab_stop_tx(struct uart_port *);
223static void sunsab_tx_idle(struct uart_sunsab_port *);
224
225static void transmit_chars(struct uart_sunsab_port *up,
226 union sab82532_irq_status *stat)
227{
228 struct circ_buf *xmit = &up->port.state->xmit;
229 int i;
230
231 if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
232 up->interrupt_mask1 |= SAB82532_IMR1_ALLS;
233 writeb(up->interrupt_mask1, &up->regs->w.imr1);
234 set_bit(SAB82532_ALLS, &up->irqflags);
235 }
236
237#if 0 /* bde@nwlink.com says this check causes problems */
238 if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR))
239 return;
240#endif
241
242 if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW))
243 return;
244
245 set_bit(SAB82532_XPR, &up->irqflags);
246 sunsab_tx_idle(up);
247
248 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
249 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
250 writeb(up->interrupt_mask1, &up->regs->w.imr1);
251 return;
252 }
253
254 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
255 writeb(up->interrupt_mask1, &up->regs->w.imr1);
256 clear_bit(SAB82532_ALLS, &up->irqflags);
257
258 /* Stuff 32 bytes into Transmit FIFO. */
259 clear_bit(SAB82532_XPR, &up->irqflags);
260 for (i = 0; i < up->port.fifosize; i++) {
261 writeb(xmit->buf[xmit->tail],
262 &up->regs->w.xfifo[i]);
263 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
264 up->port.icount.tx++;
265 if (uart_circ_empty(xmit))
266 break;
267 }
268
269 /* Issue a Transmit Frame command. */
270 sunsab_cec_wait(up);
271 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
272
273 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
274 uart_write_wakeup(&up->port);
275
276 if (uart_circ_empty(xmit))
277 sunsab_stop_tx(&up->port);
278}
279
280static void check_status(struct uart_sunsab_port *up,
281 union sab82532_irq_status *stat)
282{
283 if (stat->sreg.isr0 & SAB82532_ISR0_CDSC)
284 uart_handle_dcd_change(&up->port,
285 !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD));
286
287 if (stat->sreg.isr1 & SAB82532_ISR1_CSC)
288 uart_handle_cts_change(&up->port,
289 (readb(&up->regs->r.star) & SAB82532_STAR_CTS));
290
291 if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) {
292 up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1;
293 up->port.icount.dsr++;
294 }
295
296 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
297}
298
299static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
300{
301 struct uart_sunsab_port *up = dev_id;
302 struct tty_port *port = NULL;
303 union sab82532_irq_status status;
304 unsigned long flags;
305 unsigned char gis;
306
307 spin_lock_irqsave(&up->port.lock, flags);
308
309 status.stat = 0;
310 gis = readb(&up->regs->r.gis) >> up->gis_shift;
311 if (gis & 1)
312 status.sreg.isr0 = readb(&up->regs->r.isr0);
313 if (gis & 2)
314 status.sreg.isr1 = readb(&up->regs->r.isr1);
315
316 if (status.stat) {
317 if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
318 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
319 (status.sreg.isr1 & SAB82532_ISR1_BRK))
320 port = receive_chars(up, &status);
321 if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
322 (status.sreg.isr1 & SAB82532_ISR1_CSC))
323 check_status(up, &status);
324 if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
325 transmit_chars(up, &status);
326 }
327
328 spin_unlock_irqrestore(&up->port.lock, flags);
329
330 if (port)
331 tty_flip_buffer_push(port);
332
333 return IRQ_HANDLED;
334}
335
336/* port->lock is not held. */
337static unsigned int sunsab_tx_empty(struct uart_port *port)
338{
339 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
340 int ret;
341
342 /* Do not need a lock for a state test like this. */
343 if (test_bit(SAB82532_ALLS, &up->irqflags))
344 ret = TIOCSER_TEMT;
345 else
346 ret = 0;
347
348 return ret;
349}
350
351/* port->lock held by caller. */
352static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
353{
354 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
355
356 if (mctrl & TIOCM_RTS) {
357 up->cached_mode &= ~SAB82532_MODE_FRTS;
358 up->cached_mode |= SAB82532_MODE_RTS;
359 } else {
360 up->cached_mode |= (SAB82532_MODE_FRTS |
361 SAB82532_MODE_RTS);
362 }
363 if (mctrl & TIOCM_DTR) {
364 up->cached_pvr &= ~(up->pvr_dtr_bit);
365 } else {
366 up->cached_pvr |= up->pvr_dtr_bit;
367 }
368
369 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
370 if (test_bit(SAB82532_XPR, &up->irqflags))
371 sunsab_tx_idle(up);
372}
373
374/* port->lock is held by caller and interrupts are disabled. */
375static unsigned int sunsab_get_mctrl(struct uart_port *port)
376{
377 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
378 unsigned char val;
379 unsigned int result;
380
381 result = 0;
382
383 val = readb(&up->regs->r.pvr);
384 result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
385
386 val = readb(&up->regs->r.vstr);
387 result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR;
388
389 val = readb(&up->regs->r.star);
390 result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
391
392 return result;
393}
394
395/* port->lock held by caller. */
396static void sunsab_stop_tx(struct uart_port *port)
397{
398 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
399
400 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
401 writeb(up->interrupt_mask1, &up->regs->w.imr1);
402}
403
404/* port->lock held by caller. */
405static void sunsab_tx_idle(struct uart_sunsab_port *up)
406{
407 if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) {
408 u8 tmp;
409
410 clear_bit(SAB82532_REGS_PENDING, &up->irqflags);
411 writeb(up->cached_mode, &up->regs->rw.mode);
412 writeb(up->cached_pvr, &up->regs->rw.pvr);
413 writeb(up->cached_dafo, &up->regs->w.dafo);
414
415 writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr);
416 tmp = readb(&up->regs->rw.ccr2);
417 tmp &= ~0xc0;
418 tmp |= (up->cached_ebrg >> 2) & 0xc0;
419 writeb(tmp, &up->regs->rw.ccr2);
420 }
421}
422
423/* port->lock held by caller. */
424static void sunsab_start_tx(struct uart_port *port)
425{
426 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
427 struct circ_buf *xmit = &up->port.state->xmit;
428 int i;
429
430 up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
431 writeb(up->interrupt_mask1, &up->regs->w.imr1);
432
433 if (!test_bit(SAB82532_XPR, &up->irqflags))
434 return;
435
436 clear_bit(SAB82532_ALLS, &up->irqflags);
437 clear_bit(SAB82532_XPR, &up->irqflags);
438
439 for (i = 0; i < up->port.fifosize; i++) {
440 writeb(xmit->buf[xmit->tail],
441 &up->regs->w.xfifo[i]);
442 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
443 up->port.icount.tx++;
444 if (uart_circ_empty(xmit))
445 break;
446 }
447
448 /* Issue a Transmit Frame command. */
449 sunsab_cec_wait(up);
450 writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
451}
452
453/* port->lock is not held. */
454static void sunsab_send_xchar(struct uart_port *port, char ch)
455{
456 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
457 unsigned long flags;
458
459 spin_lock_irqsave(&up->port.lock, flags);
460
461 sunsab_tec_wait(up);
462 writeb(ch, &up->regs->w.tic);
463
464 spin_unlock_irqrestore(&up->port.lock, flags);
465}
466
467/* port->lock held by caller. */
468static void sunsab_stop_rx(struct uart_port *port)
469{
470 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
471
472 up->interrupt_mask0 |= SAB82532_IMR0_TCD;
473 writeb(up->interrupt_mask1, &up->regs->w.imr0);
474}
475
476/* port->lock held by caller. */
477static void sunsab_enable_ms(struct uart_port *port)
478{
479 /* For now we always receive these interrupts. */
480}
481
482/* port->lock is not held. */
483static void sunsab_break_ctl(struct uart_port *port, int break_state)
484{
485 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
486 unsigned long flags;
487 unsigned char val;
488
489 spin_lock_irqsave(&up->port.lock, flags);
490
491 val = up->cached_dafo;
492 if (break_state)
493 val |= SAB82532_DAFO_XBRK;
494 else
495 val &= ~SAB82532_DAFO_XBRK;
496 up->cached_dafo = val;
497
498 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
499 if (test_bit(SAB82532_XPR, &up->irqflags))
500 sunsab_tx_idle(up);
501
502 spin_unlock_irqrestore(&up->port.lock, flags);
503}
504
505/* port->lock is not held. */
506static int sunsab_startup(struct uart_port *port)
507{
508 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
509 unsigned long flags;
510 unsigned char tmp;
511 int err = request_irq(up->port.irq, sunsab_interrupt,
512 IRQF_SHARED, "sab", up);
513 if (err)
514 return err;
515
516 spin_lock_irqsave(&up->port.lock, flags);
517
518 /*
519 * Wait for any commands or immediate characters
520 */
521 sunsab_cec_wait(up);
522 sunsab_tec_wait(up);
523
524 /*
525 * Clear the FIFO buffers.
526 */
527 writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr);
528 sunsab_cec_wait(up);
529 writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr);
530
531 /*
532 * Clear the interrupt registers.
533 */
534 (void) readb(&up->regs->r.isr0);
535 (void) readb(&up->regs->r.isr1);
536
537 /*
538 * Now, initialize the UART
539 */
540 writeb(0, &up->regs->w.ccr0); /* power-down */
541 writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ |
542 SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0);
543 writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1);
544 writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL |
545 SAB82532_CCR2_TOE, &up->regs->w.ccr2);
546 writeb(0, &up->regs->w.ccr3);
547 writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4);
548 up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS |
549 SAB82532_MODE_RAC);
550 writeb(up->cached_mode, &up->regs->w.mode);
551 writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc);
552
553 tmp = readb(&up->regs->rw.ccr0);
554 tmp |= SAB82532_CCR0_PU; /* power-up */
555 writeb(tmp, &up->regs->rw.ccr0);
556
557 /*
558 * Finally, enable interrupts
559 */
560 up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
561 SAB82532_IMR0_PLLA);
562 writeb(up->interrupt_mask0, &up->regs->w.imr0);
563 up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
564 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
565 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
566 SAB82532_IMR1_XPR);
567 writeb(up->interrupt_mask1, &up->regs->w.imr1);
568 set_bit(SAB82532_ALLS, &up->irqflags);
569 set_bit(SAB82532_XPR, &up->irqflags);
570
571 spin_unlock_irqrestore(&up->port.lock, flags);
572
573 return 0;
574}
575
576/* port->lock is not held. */
577static void sunsab_shutdown(struct uart_port *port)
578{
579 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
580 unsigned long flags;
581
582 spin_lock_irqsave(&up->port.lock, flags);
583
584 /* Disable Interrupts */
585 up->interrupt_mask0 = 0xff;
586 writeb(up->interrupt_mask0, &up->regs->w.imr0);
587 up->interrupt_mask1 = 0xff;
588 writeb(up->interrupt_mask1, &up->regs->w.imr1);
589
590 /* Disable break condition */
591 up->cached_dafo = readb(&up->regs->rw.dafo);
592 up->cached_dafo &= ~SAB82532_DAFO_XBRK;
593 writeb(up->cached_dafo, &up->regs->rw.dafo);
594
595 /* Disable Receiver */
596 up->cached_mode &= ~SAB82532_MODE_RAC;
597 writeb(up->cached_mode, &up->regs->rw.mode);
598
599 /*
600 * XXX FIXME
601 *
602 * If the chip is powered down here the system hangs/crashes during
603 * reboot or shutdown. This needs to be investigated further,
604 * similar behaviour occurs in 2.4 when the driver is configured
605 * as a module only. One hint may be that data is sometimes
606 * transmitted at 9600 baud during shutdown (regardless of the
607 * speed the chip was configured for when the port was open).
608 */
609#if 0
610 /* Power Down */
611 tmp = readb(&up->regs->rw.ccr0);
612 tmp &= ~SAB82532_CCR0_PU;
613 writeb(tmp, &up->regs->rw.ccr0);
614#endif
615
616 spin_unlock_irqrestore(&up->port.lock, flags);
617 free_irq(up->port.irq, up);
618}
619
620/*
621 * This is used to figure out the divisor speeds.
622 *
623 * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
624 *
625 * with 0 <= N < 64 and 0 <= M < 16
626 */
627
628static void calc_ebrg(int baud, int *n_ret, int *m_ret)
629{
630 int n, m;
631
632 if (baud == 0) {
633 *n_ret = 0;
634 *m_ret = 0;
635 return;
636 }
637
638 /*
639 * We scale numbers by 10 so that we get better accuracy
640 * without having to use floating point. Here we increment m
641 * until n is within the valid range.
642 */
643 n = (SAB_BASE_BAUD * 10) / baud;
644 m = 0;
645 while (n >= 640) {
646 n = n / 2;
647 m++;
648 }
649 n = (n+5) / 10;
650 /*
651 * We try very hard to avoid speeds with M == 0 since they may
652 * not work correctly for XTAL frequences above 10 MHz.
653 */
654 if ((m == 0) && ((n & 1) == 0)) {
655 n = n / 2;
656 m++;
657 }
658 *n_ret = n - 1;
659 *m_ret = m;
660}
661
662/* Internal routine, port->lock is held and local interrupts are disabled. */
663static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag,
664 unsigned int iflag, unsigned int baud,
665 unsigned int quot)
666{
667 unsigned char dafo;
668 int bits, n, m;
669
670 /* Byte size and parity */
671 switch (cflag & CSIZE) {
672 case CS5: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
673 case CS6: dafo = SAB82532_DAFO_CHL6; bits = 8; break;
674 case CS7: dafo = SAB82532_DAFO_CHL7; bits = 9; break;
675 case CS8: dafo = SAB82532_DAFO_CHL8; bits = 10; break;
676 /* Never happens, but GCC is too dumb to figure it out */
677 default: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
678 }
679
680 if (cflag & CSTOPB) {
681 dafo |= SAB82532_DAFO_STOP;
682 bits++;
683 }
684
685 if (cflag & PARENB) {
686 dafo |= SAB82532_DAFO_PARE;
687 bits++;
688 }
689
690 if (cflag & PARODD) {
691 dafo |= SAB82532_DAFO_PAR_ODD;
692 } else {
693 dafo |= SAB82532_DAFO_PAR_EVEN;
694 }
695 up->cached_dafo = dafo;
696
697 calc_ebrg(baud, &n, &m);
698
699 up->cached_ebrg = n | (m << 6);
700
701 up->tec_timeout = (10 * 1000000) / baud;
702 up->cec_timeout = up->tec_timeout >> 2;
703
704 /* CTS flow control flags */
705 /* We encode read_status_mask and ignore_status_mask like so:
706 *
707 * ---------------------
708 * | ... | ISR1 | ISR0 |
709 * ---------------------
710 * .. 15 8 7 0
711 */
712
713 up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
714 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF |
715 SAB82532_ISR0_CDSC);
716 up->port.read_status_mask |= (SAB82532_ISR1_CSC |
717 SAB82532_ISR1_ALLS |
718 SAB82532_ISR1_XPR) << 8;
719 if (iflag & INPCK)
720 up->port.read_status_mask |= (SAB82532_ISR0_PERR |
721 SAB82532_ISR0_FERR);
722 if (iflag & (BRKINT | PARMRK))
723 up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);
724
725 /*
726 * Characteres to ignore
727 */
728 up->port.ignore_status_mask = 0;
729 if (iflag & IGNPAR)
730 up->port.ignore_status_mask |= (SAB82532_ISR0_PERR |
731 SAB82532_ISR0_FERR);
732 if (iflag & IGNBRK) {
733 up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8);
734 /*
735 * If we're ignoring parity and break indicators,
736 * ignore overruns too (for real raw support).
737 */
738 if (iflag & IGNPAR)
739 up->port.ignore_status_mask |= SAB82532_ISR0_RFO;
740 }
741
742 /*
743 * ignore all characters if CREAD is not set
744 */
745 if ((cflag & CREAD) == 0)
746 up->port.ignore_status_mask |= (SAB82532_ISR0_RPF |
747 SAB82532_ISR0_TCD);
748
749 uart_update_timeout(&up->port, cflag,
750 (up->port.uartclk / (16 * quot)));
751
752 /* Now schedule a register update when the chip's
753 * transmitter is idle.
754 */
755 up->cached_mode |= SAB82532_MODE_RAC;
756 set_bit(SAB82532_REGS_PENDING, &up->irqflags);
757 if (test_bit(SAB82532_XPR, &up->irqflags))
758 sunsab_tx_idle(up);
759}
760
761/* port->lock is not held. */
762static void sunsab_set_termios(struct uart_port *port, struct ktermios *termios,
763 struct ktermios *old)
764{
765 struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
766 unsigned long flags;
767 unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
768 unsigned int quot = uart_get_divisor(port, baud);
769
770 spin_lock_irqsave(&up->port.lock, flags);
771 sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot);
772 spin_unlock_irqrestore(&up->port.lock, flags);
773}
774
775static const char *sunsab_type(struct uart_port *port)
776{
777 struct uart_sunsab_port *up = (void *)port;
778 static char buf[36];
779
780 sprintf(buf, "SAB82532 %s", sab82532_version[up->type]);
781 return buf;
782}
783
784static void sunsab_release_port(struct uart_port *port)
785{
786}
787
788static int sunsab_request_port(struct uart_port *port)
789{
790 return 0;
791}
792
793static void sunsab_config_port(struct uart_port *port, int flags)
794{
795}
796
797static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
798{
799 return -EINVAL;
800}
801
802static struct uart_ops sunsab_pops = {
803 .tx_empty = sunsab_tx_empty,
804 .set_mctrl = sunsab_set_mctrl,
805 .get_mctrl = sunsab_get_mctrl,
806 .stop_tx = sunsab_stop_tx,
807 .start_tx = sunsab_start_tx,
808 .send_xchar = sunsab_send_xchar,
809 .stop_rx = sunsab_stop_rx,
810 .enable_ms = sunsab_enable_ms,
811 .break_ctl = sunsab_break_ctl,
812 .startup = sunsab_startup,
813 .shutdown = sunsab_shutdown,
814 .set_termios = sunsab_set_termios,
815 .type = sunsab_type,
816 .release_port = sunsab_release_port,
817 .request_port = sunsab_request_port,
818 .config_port = sunsab_config_port,
819 .verify_port = sunsab_verify_port,
820};
821
822static struct uart_driver sunsab_reg = {
823 .owner = THIS_MODULE,
824 .driver_name = "sunsab",
825 .dev_name = "ttyS",
826 .major = TTY_MAJOR,
827};
828
829static struct uart_sunsab_port *sunsab_ports;
830
831#ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
832
833static void sunsab_console_putchar(struct uart_port *port, int c)
834{
835 struct uart_sunsab_port *up = (struct uart_sunsab_port *)port;
836
837 sunsab_tec_wait(up);
838 writeb(c, &up->regs->w.tic);
839}
840
841static void sunsab_console_write(struct console *con, const char *s, unsigned n)
842{
843 struct uart_sunsab_port *up = &sunsab_ports[con->index];
844 unsigned long flags;
845 int locked = 1;
846
847 if (up->port.sysrq || oops_in_progress)
848 locked = spin_trylock_irqsave(&up->port.lock, flags);
849 else
850 spin_lock_irqsave(&up->port.lock, flags);
851
852 uart_console_write(&up->port, s, n, sunsab_console_putchar);
853 sunsab_tec_wait(up);
854
855 if (locked)
856 spin_unlock_irqrestore(&up->port.lock, flags);
857}
858
859static int sunsab_console_setup(struct console *con, char *options)
860{
861 struct uart_sunsab_port *up = &sunsab_ports[con->index];
862 unsigned long flags;
863 unsigned int baud, quot;
864
865 /*
866 * The console framework calls us for each and every port
867 * registered. Defer the console setup until the requested
868 * port has been properly discovered. A bit of a hack,
869 * though...
870 */
871 if (up->port.type != PORT_SUNSAB)
872 return -1;
873
874 printk("Console: ttyS%d (SAB82532)\n",
875 (sunsab_reg.minor - 64) + con->index);
876
877 sunserial_console_termios(con, up->port.dev->of_node);
878
879 switch (con->cflag & CBAUD) {
880 case B150: baud = 150; break;
881 case B300: baud = 300; break;
882 case B600: baud = 600; break;
883 case B1200: baud = 1200; break;
884 case B2400: baud = 2400; break;
885 case B4800: baud = 4800; break;
886 default: case B9600: baud = 9600; break;
887 case B19200: baud = 19200; break;
888 case B38400: baud = 38400; break;
889 case B57600: baud = 57600; break;
890 case B115200: baud = 115200; break;
891 case B230400: baud = 230400; break;
892 case B460800: baud = 460800; break;
893 }
894
895 /*
896 * Temporary fix.
897 */
898 spin_lock_init(&up->port.lock);
899
900 /*
901 * Initialize the hardware
902 */
903 sunsab_startup(&up->port);
904
905 spin_lock_irqsave(&up->port.lock, flags);
906
907 /*
908 * Finally, enable interrupts
909 */
910 up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
911 SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC;
912 writeb(up->interrupt_mask0, &up->regs->w.imr0);
913 up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
914 SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
915 SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
916 SAB82532_IMR1_XPR;
917 writeb(up->interrupt_mask1, &up->regs->w.imr1);
918
919 quot = uart_get_divisor(&up->port, baud);
920 sunsab_convert_to_sab(up, con->cflag, 0, baud, quot);
921 sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
922
923 spin_unlock_irqrestore(&up->port.lock, flags);
924
925 return 0;
926}
927
928static struct console sunsab_console = {
929 .name = "ttyS",
930 .write = sunsab_console_write,
931 .device = uart_console_device,
932 .setup = sunsab_console_setup,
933 .flags = CON_PRINTBUFFER,
934 .index = -1,
935 .data = &sunsab_reg,
936};
937
938static inline struct console *SUNSAB_CONSOLE(void)
939{
940 return &sunsab_console;
941}
942#else
943#define SUNSAB_CONSOLE() (NULL)
944#define sunsab_console_init() do { } while (0)
945#endif
946
947static int sunsab_init_one(struct uart_sunsab_port *up,
948 struct platform_device *op,
949 unsigned long offset,
950 int line)
951{
952 up->port.line = line;
953 up->port.dev = &op->dev;
954
955 up->port.mapbase = op->resource[0].start + offset;
956 up->port.membase = of_ioremap(&op->resource[0], offset,
957 sizeof(union sab82532_async_regs),
958 "sab");
959 if (!up->port.membase)
960 return -ENOMEM;
961 up->regs = (union sab82532_async_regs __iomem *) up->port.membase;
962
963 up->port.irq = op->archdata.irqs[0];
964
965 up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
966 up->port.iotype = UPIO_MEM;
967
968 writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
969
970 up->port.ops = &sunsab_pops;
971 up->port.type = PORT_SUNSAB;
972 up->port.uartclk = SAB_BASE_BAUD;
973
974 up->type = readb(&up->regs->r.vstr) & 0x0f;
975 writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr);
976 writeb(0xff, &up->regs->w.pim);
977 if ((up->port.line & 0x1) == 0) {
978 up->pvr_dsr_bit = (1 << 0);
979 up->pvr_dtr_bit = (1 << 1);
980 up->gis_shift = 2;
981 } else {
982 up->pvr_dsr_bit = (1 << 3);
983 up->pvr_dtr_bit = (1 << 2);
984 up->gis_shift = 0;
985 }
986 up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
987 writeb(up->cached_pvr, &up->regs->w.pvr);
988 up->cached_mode = readb(&up->regs->rw.mode);
989 up->cached_mode |= SAB82532_MODE_FRTS;
990 writeb(up->cached_mode, &up->regs->rw.mode);
991 up->cached_mode |= SAB82532_MODE_RTS;
992 writeb(up->cached_mode, &up->regs->rw.mode);
993
994 up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
995 up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
996
997 return 0;
998}
999
1000static int sab_probe(struct platform_device *op)
1001{
1002 static int inst;
1003 struct uart_sunsab_port *up;
1004 int err;
1005
1006 up = &sunsab_ports[inst * 2];
1007
1008 err = sunsab_init_one(&up[0], op,
1009 0,
1010 (inst * 2) + 0);
1011 if (err)
1012 goto out;
1013
1014 err = sunsab_init_one(&up[1], op,
1015 sizeof(union sab82532_async_regs),
1016 (inst * 2) + 1);
1017 if (err)
1018 goto out1;
1019
1020 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1021 &sunsab_reg, up[0].port.line,
1022 false);
1023
1024 sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
1025 &sunsab_reg, up[1].port.line,
1026 false);
1027
1028 err = uart_add_one_port(&sunsab_reg, &up[0].port);
1029 if (err)
1030 goto out2;
1031
1032 err = uart_add_one_port(&sunsab_reg, &up[1].port);
1033 if (err)
1034 goto out3;
1035
1036 platform_set_drvdata(op, &up[0]);
1037
1038 inst++;
1039
1040 return 0;
1041
1042out3:
1043 uart_remove_one_port(&sunsab_reg, &up[0].port);
1044out2:
1045 of_iounmap(&op->resource[0],
1046 up[1].port.membase,
1047 sizeof(union sab82532_async_regs));
1048out1:
1049 of_iounmap(&op->resource[0],
1050 up[0].port.membase,
1051 sizeof(union sab82532_async_regs));
1052out:
1053 return err;
1054}
1055
1056static int sab_remove(struct platform_device *op)
1057{
1058 struct uart_sunsab_port *up = platform_get_drvdata(op);
1059
1060 uart_remove_one_port(&sunsab_reg, &up[1].port);
1061 uart_remove_one_port(&sunsab_reg, &up[0].port);
1062 of_iounmap(&op->resource[0],
1063 up[1].port.membase,
1064 sizeof(union sab82532_async_regs));
1065 of_iounmap(&op->resource[0],
1066 up[0].port.membase,
1067 sizeof(union sab82532_async_regs));
1068
1069 return 0;
1070}
1071
1072static const struct of_device_id sab_match[] = {
1073 {
1074 .name = "se",
1075 },
1076 {
1077 .name = "serial",
1078 .compatible = "sab82532",
1079 },
1080 {},
1081};
1082MODULE_DEVICE_TABLE(of, sab_match);
1083
1084static struct platform_driver sab_driver = {
1085 .driver = {
1086 .name = "sab",
1087 .owner = THIS_MODULE,
1088 .of_match_table = sab_match,
1089 },
1090 .probe = sab_probe,
1091 .remove = sab_remove,
1092};
1093
1094static int __init sunsab_init(void)
1095{
1096 struct device_node *dp;
1097 int err;
1098 int num_channels = 0;
1099
1100 for_each_node_by_name(dp, "se")
1101 num_channels += 2;
1102 for_each_node_by_name(dp, "serial") {
1103 if (of_device_is_compatible(dp, "sab82532"))
1104 num_channels += 2;
1105 }
1106
1107 if (num_channels) {
1108 sunsab_ports = kzalloc(sizeof(struct uart_sunsab_port) *
1109 num_channels, GFP_KERNEL);
1110 if (!sunsab_ports)
1111 return -ENOMEM;
1112
1113 err = sunserial_register_minors(&sunsab_reg, num_channels);
1114 if (err) {
1115 kfree(sunsab_ports);
1116 sunsab_ports = NULL;
1117
1118 return err;
1119 }
1120 }
1121
1122 return platform_driver_register(&sab_driver);
1123}
1124
1125static void __exit sunsab_exit(void)
1126{
1127 platform_driver_unregister(&sab_driver);
1128 if (sunsab_reg.nr) {
1129 sunserial_unregister_minors(&sunsab_reg, sunsab_reg.nr);
1130 }
1131
1132 kfree(sunsab_ports);
1133 sunsab_ports = NULL;
1134}
1135
1136module_init(sunsab_init);
1137module_exit(sunsab_exit);
1138
1139MODULE_AUTHOR("Eddie C. Dost and David S. Miller");
1140MODULE_DESCRIPTION("Sun SAB82532 serial port driver");
1141MODULE_LICENSE("GPL");