1 // SPDX-License-Identifier: GPL-2.0
2 /* sunzilog.c: Zilog serial driver for Sparc systems.
3 *
4 * Driver for Zilog serial chips found on Sun workstations and
5 * servers. This driver could actually be made more generic.
6 *
7 * This is based on the old drivers/sbus/char/zs.c code. A lot
8 * of code has been simply moved over directly from there but
9 * much has been rewritten. Credits therefore go out to Eddie
10 * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
11 * work there.
12 *
13 * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/delay.h>
20 #include <linux/tty.h>
21 #include <linux/tty_flip.h>
22 #include <linux/major.h>
23 #include <linux/string.h>
24 #include <linux/ptrace.h>
25 #include <linux/ioport.h>
26 #include <linux/slab.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 #ifdef CONFIG_SERIO
33 #include <linux/serio.h>
34 #endif
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/setup.h>
42
43 #include <linux/serial_core.h>
44 #include <linux/sunserialcore.h>
45
46 #include "sunzilog.h"
47
48 /* On 32-bit sparcs we need to delay after register accesses
49 * to accommodate sun4 systems, but we do not need to flush writes.
50 * On 64-bit sparc we only need to flush single writes to ensure
51 * completion.
52 */
53 #ifndef CONFIG_SPARC64
54 #define ZSDELAY() udelay(5)
55 #define ZSDELAY_LONG() udelay(20)
56 #define ZS_WSYNC(channel) do { } while (0)
57 #else
58 #define ZSDELAY()
59 #define ZSDELAY_LONG()
60 #define ZS_WSYNC(__channel) \
61 readb(&((__channel)->control))
62 #endif
63
64 #define ZS_CLOCK 4915200 /* Zilog input clock rate. */
65 #define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
66
67 /*
68 * We wrap our port structure around the generic uart_port.
69 */
70 struct uart_sunzilog_port {
71 struct uart_port port;
72
73 /* IRQ servicing chain. */
74 struct uart_sunzilog_port *next;
75
76 /* Current values of Zilog write registers. */
77 unsigned char curregs[NUM_ZSREGS];
78
79 unsigned int flags;
80 #define SUNZILOG_FLAG_CONS_KEYB 0x00000001
81 #define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
82 #define SUNZILOG_FLAG_IS_CONS 0x00000004
83 #define SUNZILOG_FLAG_IS_KGDB 0x00000008
84 #define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
85 #define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
86 #define SUNZILOG_FLAG_REGS_HELD 0x00000040
87 #define SUNZILOG_FLAG_TX_STOPPED 0x00000080
88 #define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
89 #define SUNZILOG_FLAG_ESCC 0x00000200
90 #define SUNZILOG_FLAG_ISR_HANDLER 0x00000400
91
92 unsigned int cflag;
93
94 unsigned char parity_mask;
95 unsigned char prev_status;
96
97 #ifdef CONFIG_SERIO
98 struct serio serio;
99 int serio_open;
100 #endif
101 };
102
103 static void sunzilog_putchar(struct uart_port *port, unsigned char ch);
104
105 #define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
106 #define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
107
108 #define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
109 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
110 #define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
111 #define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
112 #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
113 #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
114 #define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
115 #define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
116 #define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
117
118 /* Reading and writing Zilog8530 registers. The delays are to make this
119 * driver work on the Sun4 which needs a settling delay after each chip
120 * register access, other machines handle this in hardware via auxiliary
121 * flip-flops which implement the settle time we do in software.
122 *
123 * The port lock must be held and local IRQs must be disabled
124 * when {read,write}_zsreg is invoked.
125 */
read_zsreg(struct zilog_channel __iomem * channel,unsigned char reg)126 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
127 unsigned char reg)
128 {
129 unsigned char retval;
130
131 writeb(reg, &channel->control);
132 ZSDELAY();
133 retval = readb(&channel->control);
134 ZSDELAY();
135
136 return retval;
137 }
138
write_zsreg(struct zilog_channel __iomem * channel,unsigned char reg,unsigned char value)139 static void write_zsreg(struct zilog_channel __iomem *channel,
140 unsigned char reg, unsigned char value)
141 {
142 writeb(reg, &channel->control);
143 ZSDELAY();
144 writeb(value, &channel->control);
145 ZSDELAY();
146 }
147
sunzilog_clear_fifo(struct zilog_channel __iomem * channel)148 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
149 {
150 int i;
151
152 for (i = 0; i < 32; i++) {
153 unsigned char regval;
154
155 regval = readb(&channel->control);
156 ZSDELAY();
157 if (regval & Rx_CH_AV)
158 break;
159
160 regval = read_zsreg(channel, R1);
161 readb(&channel->data);
162 ZSDELAY();
163
164 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
165 writeb(ERR_RES, &channel->control);
166 ZSDELAY();
167 ZS_WSYNC(channel);
168 }
169 }
170 }
171
172 /* This function must only be called when the TX is not busy. The UART
173 * port lock must be held and local interrupts disabled.
174 */
__load_zsregs(struct zilog_channel __iomem * channel,unsigned char * regs)175 static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
176 {
177 int i;
178 int escc;
179 unsigned char r15;
180
181 /* Let pending transmits finish. */
182 for (i = 0; i < 1000; i++) {
183 unsigned char stat = read_zsreg(channel, R1);
184 if (stat & ALL_SNT)
185 break;
186 udelay(100);
187 }
188
189 writeb(ERR_RES, &channel->control);
190 ZSDELAY();
191 ZS_WSYNC(channel);
192
193 sunzilog_clear_fifo(channel);
194
195 /* Disable all interrupts. */
196 write_zsreg(channel, R1,
197 regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
198
199 /* Set parity, sync config, stop bits, and clock divisor. */
200 write_zsreg(channel, R4, regs[R4]);
201
202 /* Set misc. TX/RX control bits. */
203 write_zsreg(channel, R10, regs[R10]);
204
205 /* Set TX/RX controls sans the enable bits. */
206 write_zsreg(channel, R3, regs[R3] & ~RxENAB);
207 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
208
209 /* Synchronous mode config. */
210 write_zsreg(channel, R6, regs[R6]);
211 write_zsreg(channel, R7, regs[R7]);
212
213 /* Don't mess with the interrupt vector (R2, unused by us) and
214 * master interrupt control (R9). We make sure this is setup
215 * properly at probe time then never touch it again.
216 */
217
218 /* Disable baud generator. */
219 write_zsreg(channel, R14, regs[R14] & ~BRENAB);
220
221 /* Clock mode control. */
222 write_zsreg(channel, R11, regs[R11]);
223
224 /* Lower and upper byte of baud rate generator divisor. */
225 write_zsreg(channel, R12, regs[R12]);
226 write_zsreg(channel, R13, regs[R13]);
227
228 /* Now rewrite R14, with BRENAB (if set). */
229 write_zsreg(channel, R14, regs[R14]);
230
231 /* External status interrupt control. */
232 write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
233
234 /* ESCC Extension Register */
235 r15 = read_zsreg(channel, R15);
236 if (r15 & 0x01) {
237 write_zsreg(channel, R7, regs[R7p]);
238
239 /* External status interrupt and FIFO control. */
240 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
241 escc = 1;
242 } else {
243 /* Clear FIFO bit case it is an issue */
244 regs[R15] &= ~FIFOEN;
245 escc = 0;
246 }
247
248 /* Reset external status interrupts. */
249 write_zsreg(channel, R0, RES_EXT_INT); /* First Latch */
250 write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
251
252 /* Rewrite R3/R5, this time without enables masked. */
253 write_zsreg(channel, R3, regs[R3]);
254 write_zsreg(channel, R5, regs[R5]);
255
256 /* Rewrite R1, this time without IRQ enabled masked. */
257 write_zsreg(channel, R1, regs[R1]);
258
259 return escc;
260 }
261
262 /* Reprogram the Zilog channel HW registers with the copies found in the
263 * software state struct. If the transmitter is busy, we defer this update
264 * until the next TX complete interrupt. Else, we do it right now.
265 *
266 * The UART port lock must be held and local interrupts disabled.
267 */
sunzilog_maybe_update_regs(struct uart_sunzilog_port * up,struct zilog_channel __iomem * channel)268 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
269 struct zilog_channel __iomem *channel)
270 {
271 if (!ZS_REGS_HELD(up)) {
272 if (ZS_TX_ACTIVE(up)) {
273 up->flags |= SUNZILOG_FLAG_REGS_HELD;
274 } else {
275 __load_zsregs(channel, up->curregs);
276 }
277 }
278 }
279
sunzilog_change_mouse_baud(struct uart_sunzilog_port * up)280 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
281 {
282 unsigned int cur_cflag = up->cflag;
283 int brg, new_baud;
284
285 up->cflag &= ~CBAUD;
286 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
287
288 brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
289 up->curregs[R12] = (brg & 0xff);
290 up->curregs[R13] = (brg >> 8) & 0xff;
291 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
292 }
293
sunzilog_kbdms_receive_chars(struct uart_sunzilog_port * up,unsigned char ch,int is_break)294 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
295 unsigned char ch, int is_break)
296 {
297 if (ZS_IS_KEYB(up)) {
298 /* Stop-A is handled by drivers/char/keyboard.c now. */
299 #ifdef CONFIG_SERIO
300 if (up->serio_open)
301 serio_interrupt(&up->serio, ch, 0);
302 #endif
303 } else if (ZS_IS_MOUSE(up)) {
304 int ret = suncore_mouse_baud_detection(ch, is_break);
305
306 switch (ret) {
307 case 2:
308 sunzilog_change_mouse_baud(up);
309 fallthrough;
310 case 1:
311 break;
312
313 case 0:
314 #ifdef CONFIG_SERIO
315 if (up->serio_open)
316 serio_interrupt(&up->serio, ch, 0);
317 #endif
318 break;
319 }
320 }
321 }
322
323 static struct tty_port *
sunzilog_receive_chars(struct uart_sunzilog_port * up,struct zilog_channel __iomem * channel)324 sunzilog_receive_chars(struct uart_sunzilog_port *up,
325 struct zilog_channel __iomem *channel)
326 {
327 struct tty_port *port = NULL;
328 unsigned char ch, r1, flag;
329
330 if (up->port.state != NULL) /* Unopened serial console */
331 port = &up->port.state->port;
332
333 for (;;) {
334
335 r1 = read_zsreg(channel, R1);
336 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
337 writeb(ERR_RES, &channel->control);
338 ZSDELAY();
339 ZS_WSYNC(channel);
340 }
341
342 ch = readb(&channel->control);
343 ZSDELAY();
344
345 /* This funny hack depends upon BRK_ABRT not interfering
346 * with the other bits we care about in R1.
347 */
348 if (ch & BRK_ABRT)
349 r1 |= BRK_ABRT;
350
351 if (!(ch & Rx_CH_AV))
352 break;
353
354 ch = readb(&channel->data);
355 ZSDELAY();
356
357 ch &= up->parity_mask;
358
359 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
360 sunzilog_kbdms_receive_chars(up, ch, 0);
361 continue;
362 }
363
364 /* A real serial line, record the character and status. */
365 flag = TTY_NORMAL;
366 up->port.icount.rx++;
367 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
368 if (r1 & BRK_ABRT) {
369 r1 &= ~(PAR_ERR | CRC_ERR);
370 up->port.icount.brk++;
371 if (uart_handle_break(&up->port))
372 continue;
373 }
374 else if (r1 & PAR_ERR)
375 up->port.icount.parity++;
376 else if (r1 & CRC_ERR)
377 up->port.icount.frame++;
378 if (r1 & Rx_OVR)
379 up->port.icount.overrun++;
380 r1 &= up->port.read_status_mask;
381 if (r1 & BRK_ABRT)
382 flag = TTY_BREAK;
383 else if (r1 & PAR_ERR)
384 flag = TTY_PARITY;
385 else if (r1 & CRC_ERR)
386 flag = TTY_FRAME;
387 }
388 if (uart_handle_sysrq_char(&up->port, ch) || !port)
389 continue;
390
391 if (up->port.ignore_status_mask == 0xff ||
392 (r1 & up->port.ignore_status_mask) == 0) {
393 tty_insert_flip_char(port, ch, flag);
394 }
395 if (r1 & Rx_OVR)
396 tty_insert_flip_char(port, 0, TTY_OVERRUN);
397 }
398
399 return port;
400 }
401
sunzilog_status_handle(struct uart_sunzilog_port * up,struct zilog_channel __iomem * channel)402 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
403 struct zilog_channel __iomem *channel)
404 {
405 unsigned char status;
406
407 status = readb(&channel->control);
408 ZSDELAY();
409
410 writeb(RES_EXT_INT, &channel->control);
411 ZSDELAY();
412 ZS_WSYNC(channel);
413
414 if (status & BRK_ABRT) {
415 if (ZS_IS_MOUSE(up))
416 sunzilog_kbdms_receive_chars(up, 0, 1);
417 if (ZS_IS_CONS(up)) {
418 /* Wait for BREAK to deassert to avoid potentially
419 * confusing the PROM.
420 */
421 while (1) {
422 status = readb(&channel->control);
423 ZSDELAY();
424 if (!(status & BRK_ABRT))
425 break;
426 }
427 sun_do_break();
428 return;
429 }
430 }
431
432 if (ZS_WANTS_MODEM_STATUS(up)) {
433 if (status & SYNC)
434 up->port.icount.dsr++;
435
436 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
437 * But it does not tell us which bit has changed, we have to keep
438 * track of this ourselves.
439 */
440 if ((status ^ up->prev_status) ^ DCD)
441 uart_handle_dcd_change(&up->port,
442 (status & DCD));
443 if ((status ^ up->prev_status) ^ CTS)
444 uart_handle_cts_change(&up->port,
445 (status & CTS));
446
447 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
448 }
449
450 up->prev_status = status;
451 }
452
sunzilog_transmit_chars(struct uart_sunzilog_port * up,struct zilog_channel __iomem * channel)453 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
454 struct zilog_channel __iomem *channel)
455 {
456 struct tty_port *tport;
457 unsigned char ch;
458
459 if (ZS_IS_CONS(up)) {
460 unsigned char status = readb(&channel->control);
461 ZSDELAY();
462
463 /* TX still busy? Just wait for the next TX done interrupt.
464 *
465 * It can occur because of how we do serial console writes. It would
466 * be nice to transmit console writes just like we normally would for
467 * a TTY line. (ie. buffered and TX interrupt driven). That is not
468 * easy because console writes cannot sleep. One solution might be
469 * to poll on enough port->xmit space becoming free. -DaveM
470 */
471 if (!(status & Tx_BUF_EMP))
472 return;
473 }
474
475 up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
476
477 if (ZS_REGS_HELD(up)) {
478 __load_zsregs(channel, up->curregs);
479 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
480 }
481
482 if (ZS_TX_STOPPED(up)) {
483 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
484 goto ack_tx_int;
485 }
486
487 if (up->port.x_char) {
488 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
489 writeb(up->port.x_char, &channel->data);
490 ZSDELAY();
491 ZS_WSYNC(channel);
492
493 up->port.icount.tx++;
494 up->port.x_char = 0;
495 return;
496 }
497
498 if (up->port.state == NULL)
499 goto ack_tx_int;
500 tport = &up->port.state->port;
501
502 if (uart_tx_stopped(&up->port))
503 goto ack_tx_int;
504
505 if (!uart_fifo_get(&up->port, &ch))
506 goto ack_tx_int;
507
508 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
509 writeb(ch, &channel->data);
510 ZSDELAY();
511 ZS_WSYNC(channel);
512
513 if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
514 uart_write_wakeup(&up->port);
515
516 return;
517
518 ack_tx_int:
519 writeb(RES_Tx_P, &channel->control);
520 ZSDELAY();
521 ZS_WSYNC(channel);
522 }
523
sunzilog_interrupt(int irq,void * dev_id)524 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
525 {
526 struct uart_sunzilog_port *up = dev_id;
527
528 while (up) {
529 struct zilog_channel __iomem *channel
530 = ZILOG_CHANNEL_FROM_PORT(&up->port);
531 struct tty_port *port;
532 unsigned char r3;
533
534 uart_port_lock(&up->port);
535 r3 = read_zsreg(channel, R3);
536
537 /* Channel A */
538 port = NULL;
539 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
540 writeb(RES_H_IUS, &channel->control);
541 ZSDELAY();
542 ZS_WSYNC(channel);
543
544 if (r3 & CHARxIP)
545 port = sunzilog_receive_chars(up, channel);
546 if (r3 & CHAEXT)
547 sunzilog_status_handle(up, channel);
548 if (r3 & CHATxIP)
549 sunzilog_transmit_chars(up, channel);
550 }
551 uart_port_unlock(&up->port);
552
553 if (port)
554 tty_flip_buffer_push(port);
555
556 /* Channel B */
557 up = up->next;
558 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
559
560 uart_port_lock(&up->port);
561 port = NULL;
562 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
563 writeb(RES_H_IUS, &channel->control);
564 ZSDELAY();
565 ZS_WSYNC(channel);
566
567 if (r3 & CHBRxIP)
568 port = sunzilog_receive_chars(up, channel);
569 if (r3 & CHBEXT)
570 sunzilog_status_handle(up, channel);
571 if (r3 & CHBTxIP)
572 sunzilog_transmit_chars(up, channel);
573 }
574 uart_port_unlock(&up->port);
575
576 if (port)
577 tty_flip_buffer_push(port);
578
579 up = up->next;
580 }
581
582 return IRQ_HANDLED;
583 }
584
585 /* A convenient way to quickly get R0 status. The caller must _not_ hold the
586 * port lock, it is acquired here.
587 */
sunzilog_read_channel_status(struct uart_port * port)588 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
589 {
590 struct zilog_channel __iomem *channel;
591 unsigned char status;
592
593 channel = ZILOG_CHANNEL_FROM_PORT(port);
594 status = readb(&channel->control);
595 ZSDELAY();
596
597 return status;
598 }
599
600 /* The port lock is not held. */
sunzilog_tx_empty(struct uart_port * port)601 static unsigned int sunzilog_tx_empty(struct uart_port *port)
602 {
603 unsigned long flags;
604 unsigned char status;
605 unsigned int ret;
606
607 uart_port_lock_irqsave(port, &flags);
608
609 status = sunzilog_read_channel_status(port);
610
611 uart_port_unlock_irqrestore(port, flags);
612
613 if (status & Tx_BUF_EMP)
614 ret = TIOCSER_TEMT;
615 else
616 ret = 0;
617
618 return ret;
619 }
620
621 /* The port lock is held and interrupts are disabled. */
sunzilog_get_mctrl(struct uart_port * port)622 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
623 {
624 unsigned char status;
625 unsigned int ret;
626
627 status = sunzilog_read_channel_status(port);
628
629 ret = 0;
630 if (status & DCD)
631 ret |= TIOCM_CAR;
632 if (status & SYNC)
633 ret |= TIOCM_DSR;
634 if (status & CTS)
635 ret |= TIOCM_CTS;
636
637 return ret;
638 }
639
640 /* The port lock is held and interrupts are disabled. */
sunzilog_set_mctrl(struct uart_port * port,unsigned int mctrl)641 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
642 {
643 struct uart_sunzilog_port *up =
644 container_of(port, struct uart_sunzilog_port, port);
645 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
646 unsigned char set_bits, clear_bits;
647
648 set_bits = clear_bits = 0;
649
650 if (mctrl & TIOCM_RTS)
651 set_bits |= RTS;
652 else
653 clear_bits |= RTS;
654 if (mctrl & TIOCM_DTR)
655 set_bits |= DTR;
656 else
657 clear_bits |= DTR;
658
659 /* NOTE: Not subject to 'transmitter active' rule. */
660 up->curregs[R5] |= set_bits;
661 up->curregs[R5] &= ~clear_bits;
662 write_zsreg(channel, R5, up->curregs[R5]);
663 }
664
665 /* The port lock is held and interrupts are disabled. */
sunzilog_stop_tx(struct uart_port * port)666 static void sunzilog_stop_tx(struct uart_port *port)
667 {
668 struct uart_sunzilog_port *up =
669 container_of(port, struct uart_sunzilog_port, port);
670
671 up->flags |= SUNZILOG_FLAG_TX_STOPPED;
672 }
673
674 /* The port lock is held and interrupts are disabled. */
sunzilog_start_tx(struct uart_port * port)675 static void sunzilog_start_tx(struct uart_port *port)
676 {
677 struct uart_sunzilog_port *up =
678 container_of(port, struct uart_sunzilog_port, port);
679 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
680 unsigned char status;
681
682 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
683 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
684
685 status = readb(&channel->control);
686 ZSDELAY();
687
688 /* TX busy? Just wait for the TX done interrupt. */
689 if (!(status & Tx_BUF_EMP))
690 return;
691
692 /* Send the first character to jump-start the TX done
693 * IRQ sending engine.
694 */
695 if (port->x_char) {
696 writeb(port->x_char, &channel->data);
697 ZSDELAY();
698 ZS_WSYNC(channel);
699
700 port->icount.tx++;
701 port->x_char = 0;
702 } else {
703 struct tty_port *tport = &port->state->port;
704 unsigned char ch;
705
706 if (!uart_fifo_get(&up->port, &ch))
707 return;
708 writeb(ch, &channel->data);
709 ZSDELAY();
710 ZS_WSYNC(channel);
711
712 if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
713 uart_write_wakeup(&up->port);
714 }
715 }
716
717 /* The port lock is held. */
sunzilog_stop_rx(struct uart_port * port)718 static void sunzilog_stop_rx(struct uart_port *port)
719 {
720 struct uart_sunzilog_port *up = UART_ZILOG(port);
721 struct zilog_channel __iomem *channel;
722
723 if (ZS_IS_CONS(up))
724 return;
725
726 channel = ZILOG_CHANNEL_FROM_PORT(port);
727
728 /* Disable all RX interrupts. */
729 up->curregs[R1] &= ~RxINT_MASK;
730 sunzilog_maybe_update_regs(up, channel);
731 }
732
733 /* The port lock is held. */
sunzilog_enable_ms(struct uart_port * port)734 static void sunzilog_enable_ms(struct uart_port *port)
735 {
736 struct uart_sunzilog_port *up =
737 container_of(port, struct uart_sunzilog_port, port);
738 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
739 unsigned char new_reg;
740
741 new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
742 if (new_reg != up->curregs[R15]) {
743 up->curregs[R15] = new_reg;
744
745 /* NOTE: Not subject to 'transmitter active' rule. */
746 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
747 }
748 }
749
750 /* The port lock is not held. */
sunzilog_break_ctl(struct uart_port * port,int break_state)751 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
752 {
753 struct uart_sunzilog_port *up =
754 container_of(port, struct uart_sunzilog_port, port);
755 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
756 unsigned char set_bits, clear_bits, new_reg;
757 unsigned long flags;
758
759 set_bits = clear_bits = 0;
760
761 if (break_state)
762 set_bits |= SND_BRK;
763 else
764 clear_bits |= SND_BRK;
765
766 uart_port_lock_irqsave(port, &flags);
767
768 new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
769 if (new_reg != up->curregs[R5]) {
770 up->curregs[R5] = new_reg;
771
772 /* NOTE: Not subject to 'transmitter active' rule. */
773 write_zsreg(channel, R5, up->curregs[R5]);
774 }
775
776 uart_port_unlock_irqrestore(port, flags);
777 }
778
__sunzilog_startup(struct uart_sunzilog_port * up)779 static void __sunzilog_startup(struct uart_sunzilog_port *up)
780 {
781 struct zilog_channel __iomem *channel;
782
783 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
784 up->prev_status = readb(&channel->control);
785
786 /* Enable receiver and transmitter. */
787 up->curregs[R3] |= RxENAB;
788 up->curregs[R5] |= TxENAB;
789
790 up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
791 sunzilog_maybe_update_regs(up, channel);
792 }
793
sunzilog_startup(struct uart_port * port)794 static int sunzilog_startup(struct uart_port *port)
795 {
796 struct uart_sunzilog_port *up = UART_ZILOG(port);
797 unsigned long flags;
798
799 if (ZS_IS_CONS(up))
800 return 0;
801
802 uart_port_lock_irqsave(port, &flags);
803 __sunzilog_startup(up);
804 uart_port_unlock_irqrestore(port, flags);
805 return 0;
806 }
807
808 /*
809 * The test for ZS_IS_CONS is explained by the following e-mail:
810 *****
811 * From: Russell King <rmk@arm.linux.org.uk>
812 * Date: Sun, 8 Dec 2002 10:18:38 +0000
813 *
814 * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
815 * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
816 * > and I noticed that something is not right with reference
817 * > counting in this case. It seems that when the console
818 * > is open by kernel initially, this is not accounted
819 * > as an open, and uart_startup is not called.
820 *
821 * That is correct. We are unable to call uart_startup when the serial
822 * console is initialised because it may need to allocate memory (as
823 * request_irq does) and the memory allocators may not have been
824 * initialised.
825 *
826 * 1. initialise the port into a state where it can send characters in the
827 * console write method.
828 *
829 * 2. don't do the actual hardware shutdown in your shutdown() method (but
830 * do the normal software shutdown - ie, free irqs etc)
831 *****
832 */
sunzilog_shutdown(struct uart_port * port)833 static void sunzilog_shutdown(struct uart_port *port)
834 {
835 struct uart_sunzilog_port *up = UART_ZILOG(port);
836 struct zilog_channel __iomem *channel;
837 unsigned long flags;
838
839 if (ZS_IS_CONS(up))
840 return;
841
842 uart_port_lock_irqsave(port, &flags);
843
844 channel = ZILOG_CHANNEL_FROM_PORT(port);
845
846 /* Disable receiver and transmitter. */
847 up->curregs[R3] &= ~RxENAB;
848 up->curregs[R5] &= ~TxENAB;
849
850 /* Disable all interrupts and BRK assertion. */
851 up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
852 up->curregs[R5] &= ~SND_BRK;
853 sunzilog_maybe_update_regs(up, channel);
854
855 uart_port_unlock_irqrestore(port, flags);
856 }
857
858 /* Shared by TTY driver and serial console setup. The port lock is held
859 * and local interrupts are disabled.
860 */
861 static void
sunzilog_convert_to_zs(struct uart_sunzilog_port * up,unsigned int cflag,unsigned int iflag,int brg)862 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
863 unsigned int iflag, int brg)
864 {
865
866 up->curregs[R10] = NRZ;
867 up->curregs[R11] = TCBR | RCBR;
868
869 /* Program BAUD and clock source. */
870 up->curregs[R4] &= ~XCLK_MASK;
871 up->curregs[R4] |= X16CLK;
872 up->curregs[R12] = brg & 0xff;
873 up->curregs[R13] = (brg >> 8) & 0xff;
874 up->curregs[R14] = BRSRC | BRENAB;
875
876 /* Character size, stop bits, and parity. */
877 up->curregs[R3] &= ~RxN_MASK;
878 up->curregs[R5] &= ~TxN_MASK;
879 switch (cflag & CSIZE) {
880 case CS5:
881 up->curregs[R3] |= Rx5;
882 up->curregs[R5] |= Tx5;
883 up->parity_mask = 0x1f;
884 break;
885 case CS6:
886 up->curregs[R3] |= Rx6;
887 up->curregs[R5] |= Tx6;
888 up->parity_mask = 0x3f;
889 break;
890 case CS7:
891 up->curregs[R3] |= Rx7;
892 up->curregs[R5] |= Tx7;
893 up->parity_mask = 0x7f;
894 break;
895 case CS8:
896 default:
897 up->curregs[R3] |= Rx8;
898 up->curregs[R5] |= Tx8;
899 up->parity_mask = 0xff;
900 break;
901 }
902 up->curregs[R4] &= ~0x0c;
903 if (cflag & CSTOPB)
904 up->curregs[R4] |= SB2;
905 else
906 up->curregs[R4] |= SB1;
907 if (cflag & PARENB)
908 up->curregs[R4] |= PAR_ENAB;
909 else
910 up->curregs[R4] &= ~PAR_ENAB;
911 if (!(cflag & PARODD))
912 up->curregs[R4] |= PAR_EVEN;
913 else
914 up->curregs[R4] &= ~PAR_EVEN;
915
916 up->port.read_status_mask = Rx_OVR;
917 if (iflag & INPCK)
918 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
919 if (iflag & (IGNBRK | BRKINT | PARMRK))
920 up->port.read_status_mask |= BRK_ABRT;
921
922 up->port.ignore_status_mask = 0;
923 if (iflag & IGNPAR)
924 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
925 if (iflag & IGNBRK) {
926 up->port.ignore_status_mask |= BRK_ABRT;
927 if (iflag & IGNPAR)
928 up->port.ignore_status_mask |= Rx_OVR;
929 }
930
931 if ((cflag & CREAD) == 0)
932 up->port.ignore_status_mask = 0xff;
933 }
934
935 /* The port lock is not held. */
936 static void
sunzilog_set_termios(struct uart_port * port,struct ktermios * termios,const struct ktermios * old)937 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
938 const struct ktermios *old)
939 {
940 struct uart_sunzilog_port *up =
941 container_of(port, struct uart_sunzilog_port, port);
942 unsigned long flags;
943 int baud, brg;
944
945 baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
946
947 uart_port_lock_irqsave(&up->port, &flags);
948
949 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
950
951 sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
952
953 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
954 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
955 else
956 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
957
958 up->cflag = termios->c_cflag;
959
960 sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
961
962 uart_update_timeout(port, termios->c_cflag, baud);
963
964 uart_port_unlock_irqrestore(&up->port, flags);
965 }
966
sunzilog_type(struct uart_port * port)967 static const char *sunzilog_type(struct uart_port *port)
968 {
969 struct uart_sunzilog_port *up = UART_ZILOG(port);
970
971 return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
972 }
973
974 /* We do not request/release mappings of the registers here, this
975 * happens at early serial probe time.
976 */
sunzilog_release_port(struct uart_port * port)977 static void sunzilog_release_port(struct uart_port *port)
978 {
979 }
980
sunzilog_request_port(struct uart_port * port)981 static int sunzilog_request_port(struct uart_port *port)
982 {
983 return 0;
984 }
985
986 /* These do not need to do anything interesting either. */
sunzilog_config_port(struct uart_port * port,int flags)987 static void sunzilog_config_port(struct uart_port *port, int flags)
988 {
989 }
990
991 /* We do not support letting the user mess with the divisor, IRQ, etc. */
sunzilog_verify_port(struct uart_port * port,struct serial_struct * ser)992 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
993 {
994 return -EINVAL;
995 }
996
997 #ifdef CONFIG_CONSOLE_POLL
sunzilog_get_poll_char(struct uart_port * port)998 static int sunzilog_get_poll_char(struct uart_port *port)
999 {
1000 unsigned char ch, r1;
1001 struct uart_sunzilog_port *up =
1002 container_of(port, struct uart_sunzilog_port, port);
1003 struct zilog_channel __iomem *channel
1004 = ZILOG_CHANNEL_FROM_PORT(&up->port);
1005
1006
1007 r1 = read_zsreg(channel, R1);
1008 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
1009 writeb(ERR_RES, &channel->control);
1010 ZSDELAY();
1011 ZS_WSYNC(channel);
1012 }
1013
1014 ch = readb(&channel->control);
1015 ZSDELAY();
1016
1017 /* This funny hack depends upon BRK_ABRT not interfering
1018 * with the other bits we care about in R1.
1019 */
1020 if (ch & BRK_ABRT)
1021 r1 |= BRK_ABRT;
1022
1023 if (!(ch & Rx_CH_AV))
1024 return NO_POLL_CHAR;
1025
1026 ch = readb(&channel->data);
1027 ZSDELAY();
1028
1029 ch &= up->parity_mask;
1030 return ch;
1031 }
1032
sunzilog_put_poll_char(struct uart_port * port,unsigned char ch)1033 static void sunzilog_put_poll_char(struct uart_port *port,
1034 unsigned char ch)
1035 {
1036 struct uart_sunzilog_port *up =
1037 container_of(port, struct uart_sunzilog_port, port);
1038
1039 sunzilog_putchar(&up->port, ch);
1040 }
1041 #endif /* CONFIG_CONSOLE_POLL */
1042
1043 static const struct uart_ops sunzilog_pops = {
1044 .tx_empty = sunzilog_tx_empty,
1045 .set_mctrl = sunzilog_set_mctrl,
1046 .get_mctrl = sunzilog_get_mctrl,
1047 .stop_tx = sunzilog_stop_tx,
1048 .start_tx = sunzilog_start_tx,
1049 .stop_rx = sunzilog_stop_rx,
1050 .enable_ms = sunzilog_enable_ms,
1051 .break_ctl = sunzilog_break_ctl,
1052 .startup = sunzilog_startup,
1053 .shutdown = sunzilog_shutdown,
1054 .set_termios = sunzilog_set_termios,
1055 .type = sunzilog_type,
1056 .release_port = sunzilog_release_port,
1057 .request_port = sunzilog_request_port,
1058 .config_port = sunzilog_config_port,
1059 .verify_port = sunzilog_verify_port,
1060 #ifdef CONFIG_CONSOLE_POLL
1061 .poll_get_char = sunzilog_get_poll_char,
1062 .poll_put_char = sunzilog_put_poll_char,
1063 #endif
1064 };
1065
1066 static int uart_chip_count;
1067 static struct uart_sunzilog_port *sunzilog_port_table;
1068 static struct zilog_layout __iomem **sunzilog_chip_regs;
1069
1070 static struct uart_sunzilog_port *sunzilog_irq_chain;
1071
1072 static struct uart_driver sunzilog_reg = {
1073 .owner = THIS_MODULE,
1074 .driver_name = "sunzilog",
1075 .dev_name = "ttyS",
1076 .major = TTY_MAJOR,
1077 };
1078
sunzilog_alloc_tables(int num_sunzilog)1079 static int __init sunzilog_alloc_tables(int num_sunzilog)
1080 {
1081 struct uart_sunzilog_port *up;
1082 unsigned long size;
1083 int num_channels = num_sunzilog * 2;
1084 int i;
1085
1086 size = num_channels * sizeof(struct uart_sunzilog_port);
1087 sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1088 if (!sunzilog_port_table)
1089 return -ENOMEM;
1090
1091 for (i = 0; i < num_channels; i++) {
1092 up = &sunzilog_port_table[i];
1093
1094 spin_lock_init(&up->port.lock);
1095
1096 if (i == 0)
1097 sunzilog_irq_chain = up;
1098
1099 if (i < num_channels - 1)
1100 up->next = up + 1;
1101 else
1102 up->next = NULL;
1103 }
1104
1105 size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
1106 sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1107 if (!sunzilog_chip_regs) {
1108 kfree(sunzilog_port_table);
1109 sunzilog_irq_chain = NULL;
1110 return -ENOMEM;
1111 }
1112
1113 return 0;
1114 }
1115
sunzilog_free_tables(void)1116 static void sunzilog_free_tables(void)
1117 {
1118 kfree(sunzilog_port_table);
1119 sunzilog_irq_chain = NULL;
1120 kfree(sunzilog_chip_regs);
1121 }
1122
1123 #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
1124
sunzilog_putchar(struct uart_port * port,unsigned char ch)1125 static void __maybe_unused sunzilog_putchar(struct uart_port *port, unsigned char ch)
1126 {
1127 struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1128 int loops = ZS_PUT_CHAR_MAX_DELAY;
1129
1130 /* This is a timed polling loop so do not switch the explicit
1131 * udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
1132 */
1133 do {
1134 unsigned char val = readb(&channel->control);
1135 if (val & Tx_BUF_EMP) {
1136 ZSDELAY();
1137 break;
1138 }
1139 udelay(5);
1140 } while (--loops);
1141
1142 writeb(ch, &channel->data);
1143 ZSDELAY();
1144 ZS_WSYNC(channel);
1145 }
1146
1147 #ifdef CONFIG_SERIO
1148
1149 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1150
sunzilog_serio_write(struct serio * serio,unsigned char ch)1151 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1152 {
1153 struct uart_sunzilog_port *up = serio->port_data;
1154 unsigned long flags;
1155
1156 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1157
1158 sunzilog_putchar(&up->port, ch);
1159
1160 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1161
1162 return 0;
1163 }
1164
sunzilog_serio_open(struct serio * serio)1165 static int sunzilog_serio_open(struct serio *serio)
1166 {
1167 struct uart_sunzilog_port *up = serio->port_data;
1168 unsigned long flags;
1169 int ret;
1170
1171 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1172 if (!up->serio_open) {
1173 up->serio_open = 1;
1174 ret = 0;
1175 } else
1176 ret = -EBUSY;
1177 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1178
1179 return ret;
1180 }
1181
sunzilog_serio_close(struct serio * serio)1182 static void sunzilog_serio_close(struct serio *serio)
1183 {
1184 struct uart_sunzilog_port *up = serio->port_data;
1185 unsigned long flags;
1186
1187 spin_lock_irqsave(&sunzilog_serio_lock, flags);
1188 up->serio_open = 0;
1189 spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1190 }
1191
1192 #endif /* CONFIG_SERIO */
1193
1194 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1195 static void
sunzilog_console_write(struct console * con,const char * s,unsigned int count)1196 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1197 {
1198 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1199 unsigned long flags;
1200 int locked = 1;
1201
1202 if (up->port.sysrq || oops_in_progress)
1203 locked = uart_port_trylock_irqsave(&up->port, &flags);
1204 else
1205 uart_port_lock_irqsave(&up->port, &flags);
1206
1207 uart_console_write(&up->port, s, count, sunzilog_putchar);
1208 udelay(2);
1209
1210 if (locked)
1211 uart_port_unlock_irqrestore(&up->port, flags);
1212 }
1213
sunzilog_console_setup(struct console * con,char * options)1214 static int __init sunzilog_console_setup(struct console *con, char *options)
1215 {
1216 struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1217 unsigned long flags;
1218 int baud, brg;
1219
1220 if (up->port.type != PORT_SUNZILOG)
1221 return -EINVAL;
1222
1223 printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1224 (sunzilog_reg.minor - 64) + con->index, con->index);
1225
1226 /* Get firmware console settings. */
1227 sunserial_console_termios(con, up->port.dev->of_node);
1228
1229 /* Firmware console speed is limited to 150-->38400 baud so
1230 * this hackish cflag thing is OK.
1231 */
1232 switch (con->cflag & CBAUD) {
1233 case B150: baud = 150; break;
1234 case B300: baud = 300; break;
1235 case B600: baud = 600; break;
1236 case B1200: baud = 1200; break;
1237 case B2400: baud = 2400; break;
1238 case B4800: baud = 4800; break;
1239 default: case B9600: baud = 9600; break;
1240 case B19200: baud = 19200; break;
1241 case B38400: baud = 38400; break;
1242 }
1243
1244 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1245
1246 uart_port_lock_irqsave(&up->port, &flags);
1247
1248 up->curregs[R15] |= BRKIE;
1249 sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1250
1251 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1252 __sunzilog_startup(up);
1253
1254 uart_port_unlock_irqrestore(&up->port, flags);
1255
1256 return 0;
1257 }
1258
1259 static struct console sunzilog_console_ops = {
1260 .name = "ttyS",
1261 .write = sunzilog_console_write,
1262 .device = uart_console_device,
1263 .setup = sunzilog_console_setup,
1264 .flags = CON_PRINTBUFFER,
1265 .index = -1,
1266 .data = &sunzilog_reg,
1267 };
1268
SUNZILOG_CONSOLE(void)1269 static inline struct console *SUNZILOG_CONSOLE(void)
1270 {
1271 return &sunzilog_console_ops;
1272 }
1273
1274 #else
1275 #define SUNZILOG_CONSOLE() (NULL)
1276 #endif
1277
sunzilog_init_kbdms(struct uart_sunzilog_port * up)1278 static void sunzilog_init_kbdms(struct uart_sunzilog_port *up)
1279 {
1280 int baud, brg;
1281
1282 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1283 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1284 baud = 1200;
1285 } else {
1286 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1287 baud = 4800;
1288 }
1289
1290 up->curregs[R15] |= BRKIE;
1291 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1292 sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1293 sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1294 __sunzilog_startup(up);
1295 }
1296
1297 #ifdef CONFIG_SERIO
sunzilog_register_serio(struct uart_sunzilog_port * up)1298 static void sunzilog_register_serio(struct uart_sunzilog_port *up)
1299 {
1300 struct serio *serio = &up->serio;
1301
1302 serio->port_data = up;
1303
1304 serio->id.type = SERIO_RS232;
1305 if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1306 serio->id.proto = SERIO_SUNKBD;
1307 strscpy(serio->name, "zskbd", sizeof(serio->name));
1308 } else {
1309 serio->id.proto = SERIO_SUN;
1310 serio->id.extra = 1;
1311 strscpy(serio->name, "zsms", sizeof(serio->name));
1312 }
1313 strscpy(serio->phys,
1314 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1315 "zs/serio0" : "zs/serio1"),
1316 sizeof(serio->phys));
1317
1318 serio->write = sunzilog_serio_write;
1319 serio->open = sunzilog_serio_open;
1320 serio->close = sunzilog_serio_close;
1321 serio->dev.parent = up->port.dev;
1322
1323 serio_register_port(serio);
1324 }
1325 #endif
1326
sunzilog_init_hw(struct uart_sunzilog_port * up)1327 static void sunzilog_init_hw(struct uart_sunzilog_port *up)
1328 {
1329 struct zilog_channel __iomem *channel;
1330 unsigned long flags;
1331 int baud, brg;
1332
1333 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1334
1335 uart_port_lock_irqsave(&up->port, &flags);
1336 if (ZS_IS_CHANNEL_A(up)) {
1337 write_zsreg(channel, R9, FHWRES);
1338 ZSDELAY_LONG();
1339 (void) read_zsreg(channel, R0);
1340 }
1341
1342 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1343 SUNZILOG_FLAG_CONS_MOUSE)) {
1344 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1345 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1346 up->curregs[R3] = RxENAB | Rx8;
1347 up->curregs[R5] = TxENAB | Tx8;
1348 up->curregs[R6] = 0x00; /* SDLC Address */
1349 up->curregs[R7] = 0x7E; /* SDLC Flag */
1350 up->curregs[R9] = NV;
1351 up->curregs[R7p] = 0x00;
1352 sunzilog_init_kbdms(up);
1353 /* Only enable interrupts if an ISR handler available */
1354 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1355 up->curregs[R9] |= MIE;
1356 write_zsreg(channel, R9, up->curregs[R9]);
1357 } else {
1358 /* Normal serial TTY. */
1359 up->parity_mask = 0xff;
1360 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1361 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1362 up->curregs[R3] = RxENAB | Rx8;
1363 up->curregs[R5] = TxENAB | Tx8;
1364 up->curregs[R6] = 0x00; /* SDLC Address */
1365 up->curregs[R7] = 0x7E; /* SDLC Flag */
1366 up->curregs[R9] = NV;
1367 up->curregs[R10] = NRZ;
1368 up->curregs[R11] = TCBR | RCBR;
1369 baud = 9600;
1370 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1371 up->curregs[R12] = (brg & 0xff);
1372 up->curregs[R13] = (brg >> 8) & 0xff;
1373 up->curregs[R14] = BRSRC | BRENAB;
1374 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1375 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1376 if (__load_zsregs(channel, up->curregs)) {
1377 up->flags |= SUNZILOG_FLAG_ESCC;
1378 }
1379 /* Only enable interrupts if an ISR handler available */
1380 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1381 up->curregs[R9] |= MIE;
1382 write_zsreg(channel, R9, up->curregs[R9]);
1383 }
1384
1385 uart_port_unlock_irqrestore(&up->port, flags);
1386
1387 #ifdef CONFIG_SERIO
1388 if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1389 SUNZILOG_FLAG_CONS_MOUSE))
1390 sunzilog_register_serio(up);
1391 #endif
1392 }
1393
1394 static int zilog_irq;
1395
zs_probe(struct platform_device * op)1396 static int zs_probe(struct platform_device *op)
1397 {
1398 static int kbm_inst, uart_inst;
1399 int inst;
1400 struct uart_sunzilog_port *up;
1401 struct zilog_layout __iomem *rp;
1402 int keyboard_mouse = 0;
1403 int err;
1404
1405 if (of_property_present(op->dev.of_node, "keyboard"))
1406 keyboard_mouse = 1;
1407
1408 /* uarts must come before keyboards/mice */
1409 if (keyboard_mouse)
1410 inst = uart_chip_count + kbm_inst;
1411 else
1412 inst = uart_inst;
1413
1414 sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1415 sizeof(struct zilog_layout),
1416 "zs");
1417 if (!sunzilog_chip_regs[inst])
1418 return -ENOMEM;
1419
1420 rp = sunzilog_chip_regs[inst];
1421
1422 if (!zilog_irq)
1423 zilog_irq = op->archdata.irqs[0];
1424
1425 up = &sunzilog_port_table[inst * 2];
1426
1427 /* Channel A */
1428 up[0].port.mapbase = op->resource[0].start + 0x00;
1429 up[0].port.membase = (void __iomem *) &rp->channelA;
1430 up[0].port.iotype = UPIO_MEM;
1431 up[0].port.irq = op->archdata.irqs[0];
1432 up[0].port.uartclk = ZS_CLOCK;
1433 up[0].port.fifosize = 1;
1434 up[0].port.ops = &sunzilog_pops;
1435 up[0].port.type = PORT_SUNZILOG;
1436 up[0].port.flags = 0;
1437 up[0].port.line = (inst * 2) + 0;
1438 up[0].port.dev = &op->dev;
1439 up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1440 up[0].port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNZILOG_CONSOLE);
1441 if (keyboard_mouse)
1442 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1443 sunzilog_init_hw(&up[0]);
1444
1445 /* Channel B */
1446 up[1].port.mapbase = op->resource[0].start + 0x04;
1447 up[1].port.membase = (void __iomem *) &rp->channelB;
1448 up[1].port.iotype = UPIO_MEM;
1449 up[1].port.irq = op->archdata.irqs[0];
1450 up[1].port.uartclk = ZS_CLOCK;
1451 up[1].port.fifosize = 1;
1452 up[1].port.ops = &sunzilog_pops;
1453 up[1].port.type = PORT_SUNZILOG;
1454 up[1].port.flags = 0;
1455 up[1].port.line = (inst * 2) + 1;
1456 up[1].port.dev = &op->dev;
1457 up[1].flags |= 0;
1458 up[1].port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNZILOG_CONSOLE);
1459 if (keyboard_mouse)
1460 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1461 sunzilog_init_hw(&up[1]);
1462
1463 if (!keyboard_mouse) {
1464 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
1465 &sunzilog_reg, up[0].port.line,
1466 false))
1467 up->flags |= SUNZILOG_FLAG_IS_CONS;
1468 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1469 if (err) {
1470 of_iounmap(&op->resource[0],
1471 rp, sizeof(struct zilog_layout));
1472 return err;
1473 }
1474 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
1475 &sunzilog_reg, up[1].port.line,
1476 false))
1477 up->flags |= SUNZILOG_FLAG_IS_CONS;
1478 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1479 if (err) {
1480 uart_remove_one_port(&sunzilog_reg, &up[0].port);
1481 of_iounmap(&op->resource[0],
1482 rp, sizeof(struct zilog_layout));
1483 return err;
1484 }
1485 uart_inst++;
1486 } else {
1487 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
1488 "is a %s\n",
1489 dev_name(&op->dev),
1490 (unsigned long long) up[0].port.mapbase,
1491 op->archdata.irqs[0], sunzilog_type(&up[0].port));
1492 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
1493 "is a %s\n",
1494 dev_name(&op->dev),
1495 (unsigned long long) up[1].port.mapbase,
1496 op->archdata.irqs[0], sunzilog_type(&up[1].port));
1497 kbm_inst++;
1498 }
1499
1500 platform_set_drvdata(op, &up[0]);
1501
1502 return 0;
1503 }
1504
zs_remove_one(struct uart_sunzilog_port * up)1505 static void zs_remove_one(struct uart_sunzilog_port *up)
1506 {
1507 if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1508 #ifdef CONFIG_SERIO
1509 serio_unregister_port(&up->serio);
1510 #endif
1511 } else
1512 uart_remove_one_port(&sunzilog_reg, &up->port);
1513 }
1514
zs_remove(struct platform_device * op)1515 static void zs_remove(struct platform_device *op)
1516 {
1517 struct uart_sunzilog_port *up = platform_get_drvdata(op);
1518 struct zilog_layout __iomem *regs;
1519
1520 zs_remove_one(&up[0]);
1521 zs_remove_one(&up[1]);
1522
1523 regs = sunzilog_chip_regs[up[0].port.line / 2];
1524 of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1525 }
1526
1527 static const struct of_device_id zs_match[] = {
1528 {
1529 .name = "zs",
1530 },
1531 {},
1532 };
1533 MODULE_DEVICE_TABLE(of, zs_match);
1534
1535 static struct platform_driver zs_driver = {
1536 .driver = {
1537 .name = "zs",
1538 .of_match_table = zs_match,
1539 },
1540 .probe = zs_probe,
1541 .remove_new = zs_remove,
1542 };
1543
sunzilog_init(void)1544 static int __init sunzilog_init(void)
1545 {
1546 struct device_node *dp;
1547 int err;
1548 int num_keybms = 0;
1549 int num_sunzilog = 0;
1550
1551 for_each_node_by_name(dp, "zs") {
1552 num_sunzilog++;
1553 if (of_property_present(dp, "keyboard"))
1554 num_keybms++;
1555 }
1556
1557 if (num_sunzilog) {
1558 err = sunzilog_alloc_tables(num_sunzilog);
1559 if (err)
1560 goto out;
1561
1562 uart_chip_count = num_sunzilog - num_keybms;
1563
1564 err = sunserial_register_minors(&sunzilog_reg,
1565 uart_chip_count * 2);
1566 if (err)
1567 goto out_free_tables;
1568 }
1569
1570 err = platform_driver_register(&zs_driver);
1571 if (err)
1572 goto out_unregister_uart;
1573
1574 if (zilog_irq) {
1575 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1576 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1577 "zs", sunzilog_irq_chain);
1578 if (err)
1579 goto out_unregister_driver;
1580
1581 /* Enable Interrupts */
1582 while (up) {
1583 struct zilog_channel __iomem *channel;
1584
1585 /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1586 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1587 up->flags |= SUNZILOG_FLAG_ISR_HANDLER;
1588 up->curregs[R9] |= MIE;
1589 write_zsreg(channel, R9, up->curregs[R9]);
1590 up = up->next;
1591 }
1592 }
1593
1594 out:
1595 return err;
1596
1597 out_unregister_driver:
1598 platform_driver_unregister(&zs_driver);
1599
1600 out_unregister_uart:
1601 if (num_sunzilog) {
1602 sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
1603 sunzilog_reg.cons = NULL;
1604 }
1605
1606 out_free_tables:
1607 sunzilog_free_tables();
1608 goto out;
1609 }
1610
sunzilog_exit(void)1611 static void __exit sunzilog_exit(void)
1612 {
1613 platform_driver_unregister(&zs_driver);
1614
1615 if (zilog_irq) {
1616 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1617
1618 /* Disable Interrupts */
1619 while (up) {
1620 struct zilog_channel __iomem *channel;
1621
1622 /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1623 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1624 up->flags &= ~SUNZILOG_FLAG_ISR_HANDLER;
1625 up->curregs[R9] &= ~MIE;
1626 write_zsreg(channel, R9, up->curregs[R9]);
1627 up = up->next;
1628 }
1629
1630 free_irq(zilog_irq, sunzilog_irq_chain);
1631 zilog_irq = 0;
1632 }
1633
1634 if (sunzilog_reg.nr) {
1635 sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
1636 sunzilog_free_tables();
1637 }
1638 }
1639
1640 module_init(sunzilog_init);
1641 module_exit(sunzilog_exit);
1642
1643 MODULE_AUTHOR("David S. Miller");
1644 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1645 MODULE_VERSION("2.0");
1646 MODULE_LICENSE("GPL");
1647