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