1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
4 *
5 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998-1999 Pete Zaitcev (zaitcev@yahoo.com)
7 *
8 * This is mainly a variation of 8250.c, credits go to authors mentioned
9 * therein. In fact this driver should be merged into the generic 8250.c
10 * infrastructure perhaps using a 8250_sparc.c module.
11 *
12 * Fixed to use tty_get_baud_rate().
13 * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
14 *
15 * Converted to new 2.5.x UART layer.
16 * David S. Miller (davem@davemloft.net), 2002-Jul-29
17 */
18
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/spinlock.h>
22 #include <linux/errno.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/major.h>
26 #include <linux/string.h>
27 #include <linux/ptrace.h>
28 #include <linux/ioport.h>
29 #include <linux/circ_buf.h>
30 #include <linux/serial.h>
31 #include <linux/sysrq.h>
32 #include <linux/console.h>
33 #include <linux/slab.h>
34 #ifdef CONFIG_SERIO
35 #include <linux/serio.h>
36 #endif
37 #include <linux/serial_reg.h>
38 #include <linux/init.h>
39 #include <linux/delay.h>
40 #include <linux/of_device.h>
41
42 #include <linux/io.h>
43 #include <asm/irq.h>
44 #include <asm/prom.h>
45 #include <asm/setup.h>
46
47 #include <linux/serial_core.h>
48 #include <linux/sunserialcore.h>
49
50 /* We are on a NS PC87303 clocked with 24.0 MHz, which results
51 * in a UART clock of 1.8462 MHz.
52 */
53 #define SU_BASE_BAUD (1846200 / 16)
54
55 enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
56 static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
57
58 struct serial_uart_config {
59 char *name;
60 int dfl_xmit_fifo_size;
61 int flags;
62 };
63
64 /*
65 * Here we define the default xmit fifo size used for each type of UART.
66 */
67 static const struct serial_uart_config uart_config[] = {
68 { "unknown", 1, 0 },
69 { "8250", 1, 0 },
70 { "16450", 1, 0 },
71 { "16550", 1, 0 },
72 { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
73 { "Cirrus", 1, 0 },
74 { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
75 { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
76 { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO },
77 { "Startech", 1, 0 },
78 { "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO },
79 { "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
80 { "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
81 { "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO }
82 };
83
84 struct uart_sunsu_port {
85 struct uart_port port;
86 unsigned char acr;
87 unsigned char ier;
88 unsigned short rev;
89 unsigned char lcr;
90 unsigned int lsr_break_flag;
91 unsigned int cflag;
92
93 /* Probing information. */
94 enum su_type su_type;
95 unsigned int type_probed; /* XXX Stupid */
96 unsigned long reg_size;
97
98 #ifdef CONFIG_SERIO
99 struct serio serio;
100 int serio_open;
101 #endif
102 };
103
serial_in(struct uart_sunsu_port * up,int offset)104 static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
105 {
106 offset <<= up->port.regshift;
107
108 switch (up->port.iotype) {
109 case UPIO_HUB6:
110 outb(up->port.hub6 - 1 + offset, up->port.iobase);
111 return inb(up->port.iobase + 1);
112
113 case UPIO_MEM:
114 return readb(up->port.membase + offset);
115
116 default:
117 return inb(up->port.iobase + offset);
118 }
119 }
120
serial_out(struct uart_sunsu_port * up,int offset,int value)121 static void serial_out(struct uart_sunsu_port *up, int offset, int value)
122 {
123 #ifndef CONFIG_SPARC64
124 /*
125 * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
126 * connected with a gate then go to SlavIO. When IRQ4 goes tristated
127 * gate outputs a logical one. Since we use level triggered interrupts
128 * we have lockup and watchdog reset. We cannot mask IRQ because
129 * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
130 * This problem is similar to what Alpha people suffer, see serial.c.
131 */
132 if (offset == UART_MCR)
133 value |= UART_MCR_OUT2;
134 #endif
135 offset <<= up->port.regshift;
136
137 switch (up->port.iotype) {
138 case UPIO_HUB6:
139 outb(up->port.hub6 - 1 + offset, up->port.iobase);
140 outb(value, up->port.iobase + 1);
141 break;
142
143 case UPIO_MEM:
144 writeb(value, up->port.membase + offset);
145 break;
146
147 default:
148 outb(value, up->port.iobase + offset);
149 }
150 }
151
152 /*
153 * We used to support using pause I/O for certain machines. We
154 * haven't supported this for a while, but just in case it's badly
155 * needed for certain old 386 machines, I've left these #define's
156 * in....
157 */
158 #define serial_inp(up, offset) serial_in(up, offset)
159 #define serial_outp(up, offset, value) serial_out(up, offset, value)
160
161
162 /*
163 * For the 16C950
164 */
serial_icr_write(struct uart_sunsu_port * up,int offset,int value)165 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
166 {
167 serial_out(up, UART_SCR, offset);
168 serial_out(up, UART_ICR, value);
169 }
170
171 #if 0 /* Unused currently */
172 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
173 {
174 unsigned int value;
175
176 serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
177 serial_out(up, UART_SCR, offset);
178 value = serial_in(up, UART_ICR);
179 serial_icr_write(up, UART_ACR, up->acr);
180
181 return value;
182 }
183 #endif
184
185 #ifdef CONFIG_SERIAL_8250_RSA
186 /*
187 * Attempts to turn on the RSA FIFO. Returns zero on failure.
188 * We set the port uart clock rate if we succeed.
189 */
__enable_rsa(struct uart_sunsu_port * up)190 static int __enable_rsa(struct uart_sunsu_port *up)
191 {
192 unsigned char mode;
193 int result;
194
195 mode = serial_inp(up, UART_RSA_MSR);
196 result = mode & UART_RSA_MSR_FIFO;
197
198 if (!result) {
199 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
200 mode = serial_inp(up, UART_RSA_MSR);
201 result = mode & UART_RSA_MSR_FIFO;
202 }
203
204 if (result)
205 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
206
207 return result;
208 }
209
enable_rsa(struct uart_sunsu_port * up)210 static void enable_rsa(struct uart_sunsu_port *up)
211 {
212 if (up->port.type == PORT_RSA) {
213 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
214 spin_lock_irq(&up->port.lock);
215 __enable_rsa(up);
216 spin_unlock_irq(&up->port.lock);
217 }
218 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
219 serial_outp(up, UART_RSA_FRR, 0);
220 }
221 }
222
223 /*
224 * Attempts to turn off the RSA FIFO. Returns zero on failure.
225 * It is unknown why interrupts were disabled in here. However,
226 * the caller is expected to preserve this behaviour by grabbing
227 * the spinlock before calling this function.
228 */
disable_rsa(struct uart_sunsu_port * up)229 static void disable_rsa(struct uart_sunsu_port *up)
230 {
231 unsigned char mode;
232 int result;
233
234 if (up->port.type == PORT_RSA &&
235 up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
236 spin_lock_irq(&up->port.lock);
237
238 mode = serial_inp(up, UART_RSA_MSR);
239 result = !(mode & UART_RSA_MSR_FIFO);
240
241 if (!result) {
242 serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
243 mode = serial_inp(up, UART_RSA_MSR);
244 result = !(mode & UART_RSA_MSR_FIFO);
245 }
246
247 if (result)
248 up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
249 spin_unlock_irq(&up->port.lock);
250 }
251 }
252 #endif /* CONFIG_SERIAL_8250_RSA */
253
__stop_tx(struct uart_sunsu_port * p)254 static inline void __stop_tx(struct uart_sunsu_port *p)
255 {
256 if (p->ier & UART_IER_THRI) {
257 p->ier &= ~UART_IER_THRI;
258 serial_out(p, UART_IER, p->ier);
259 }
260 }
261
sunsu_stop_tx(struct uart_port * port)262 static void sunsu_stop_tx(struct uart_port *port)
263 {
264 struct uart_sunsu_port *up =
265 container_of(port, struct uart_sunsu_port, port);
266
267 __stop_tx(up);
268
269 /*
270 * We really want to stop the transmitter from sending.
271 */
272 if (up->port.type == PORT_16C950) {
273 up->acr |= UART_ACR_TXDIS;
274 serial_icr_write(up, UART_ACR, up->acr);
275 }
276 }
277
sunsu_start_tx(struct uart_port * port)278 static void sunsu_start_tx(struct uart_port *port)
279 {
280 struct uart_sunsu_port *up =
281 container_of(port, struct uart_sunsu_port, port);
282
283 if (!(up->ier & UART_IER_THRI)) {
284 up->ier |= UART_IER_THRI;
285 serial_out(up, UART_IER, up->ier);
286 }
287
288 /*
289 * Re-enable the transmitter if we disabled it.
290 */
291 if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
292 up->acr &= ~UART_ACR_TXDIS;
293 serial_icr_write(up, UART_ACR, up->acr);
294 }
295 }
296
sunsu_stop_rx(struct uart_port * port)297 static void sunsu_stop_rx(struct uart_port *port)
298 {
299 struct uart_sunsu_port *up =
300 container_of(port, struct uart_sunsu_port, port);
301
302 up->ier &= ~UART_IER_RLSI;
303 up->port.read_status_mask &= ~UART_LSR_DR;
304 serial_out(up, UART_IER, up->ier);
305 }
306
sunsu_enable_ms(struct uart_port * port)307 static void sunsu_enable_ms(struct uart_port *port)
308 {
309 struct uart_sunsu_port *up =
310 container_of(port, struct uart_sunsu_port, port);
311 unsigned long flags;
312
313 spin_lock_irqsave(&up->port.lock, flags);
314 up->ier |= UART_IER_MSI;
315 serial_out(up, UART_IER, up->ier);
316 spin_unlock_irqrestore(&up->port.lock, flags);
317 }
318
319 static void
receive_chars(struct uart_sunsu_port * up,unsigned char * status)320 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
321 {
322 struct tty_port *port = &up->port.state->port;
323 unsigned char ch, flag;
324 int max_count = 256;
325 int saw_console_brk = 0;
326
327 do {
328 ch = serial_inp(up, UART_RX);
329 flag = TTY_NORMAL;
330 up->port.icount.rx++;
331
332 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
333 UART_LSR_FE | UART_LSR_OE))) {
334 /*
335 * For statistics only
336 */
337 if (*status & UART_LSR_BI) {
338 *status &= ~(UART_LSR_FE | UART_LSR_PE);
339 up->port.icount.brk++;
340 if (up->port.cons != NULL &&
341 up->port.line == up->port.cons->index)
342 saw_console_brk = 1;
343 /*
344 * We do the SysRQ and SAK checking
345 * here because otherwise the break
346 * may get masked by ignore_status_mask
347 * or read_status_mask.
348 */
349 if (uart_handle_break(&up->port))
350 goto ignore_char;
351 } else if (*status & UART_LSR_PE)
352 up->port.icount.parity++;
353 else if (*status & UART_LSR_FE)
354 up->port.icount.frame++;
355 if (*status & UART_LSR_OE)
356 up->port.icount.overrun++;
357
358 /*
359 * Mask off conditions which should be ingored.
360 */
361 *status &= up->port.read_status_mask;
362
363 if (up->port.cons != NULL &&
364 up->port.line == up->port.cons->index) {
365 /* Recover the break flag from console xmit */
366 *status |= up->lsr_break_flag;
367 up->lsr_break_flag = 0;
368 }
369
370 if (*status & UART_LSR_BI) {
371 flag = TTY_BREAK;
372 } else if (*status & UART_LSR_PE)
373 flag = TTY_PARITY;
374 else if (*status & UART_LSR_FE)
375 flag = TTY_FRAME;
376 }
377 if (uart_handle_sysrq_char(&up->port, ch))
378 goto ignore_char;
379 if ((*status & up->port.ignore_status_mask) == 0)
380 tty_insert_flip_char(port, ch, flag);
381 if (*status & UART_LSR_OE)
382 /*
383 * Overrun is special, since it's reported
384 * immediately, and doesn't affect the current
385 * character.
386 */
387 tty_insert_flip_char(port, 0, TTY_OVERRUN);
388 ignore_char:
389 *status = serial_inp(up, UART_LSR);
390 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
391
392 if (saw_console_brk)
393 sun_do_break();
394 }
395
transmit_chars(struct uart_sunsu_port * up)396 static void transmit_chars(struct uart_sunsu_port *up)
397 {
398 struct circ_buf *xmit = &up->port.state->xmit;
399 int count;
400
401 if (up->port.x_char) {
402 serial_outp(up, UART_TX, up->port.x_char);
403 up->port.icount.tx++;
404 up->port.x_char = 0;
405 return;
406 }
407 if (uart_tx_stopped(&up->port)) {
408 sunsu_stop_tx(&up->port);
409 return;
410 }
411 if (uart_circ_empty(xmit)) {
412 __stop_tx(up);
413 return;
414 }
415
416 count = up->port.fifosize;
417 do {
418 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
419 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
420 up->port.icount.tx++;
421 if (uart_circ_empty(xmit))
422 break;
423 } while (--count > 0);
424
425 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
426 uart_write_wakeup(&up->port);
427
428 if (uart_circ_empty(xmit))
429 __stop_tx(up);
430 }
431
check_modem_status(struct uart_sunsu_port * up)432 static void check_modem_status(struct uart_sunsu_port *up)
433 {
434 int status;
435
436 status = serial_in(up, UART_MSR);
437
438 if ((status & UART_MSR_ANY_DELTA) == 0)
439 return;
440
441 if (status & UART_MSR_TERI)
442 up->port.icount.rng++;
443 if (status & UART_MSR_DDSR)
444 up->port.icount.dsr++;
445 if (status & UART_MSR_DDCD)
446 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
447 if (status & UART_MSR_DCTS)
448 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
449
450 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
451 }
452
sunsu_serial_interrupt(int irq,void * dev_id)453 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
454 {
455 struct uart_sunsu_port *up = dev_id;
456 unsigned long flags;
457 unsigned char status;
458
459 spin_lock_irqsave(&up->port.lock, flags);
460
461 do {
462 status = serial_inp(up, UART_LSR);
463 if (status & UART_LSR_DR)
464 receive_chars(up, &status);
465 check_modem_status(up);
466 if (status & UART_LSR_THRE)
467 transmit_chars(up);
468
469 tty_flip_buffer_push(&up->port.state->port);
470
471 } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
472
473 spin_unlock_irqrestore(&up->port.lock, flags);
474
475 return IRQ_HANDLED;
476 }
477
478 /* Separate interrupt handling path for keyboard/mouse ports. */
479
480 static void
481 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
482 unsigned int iflag, unsigned int quot);
483
sunsu_change_mouse_baud(struct uart_sunsu_port * up)484 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
485 {
486 unsigned int cur_cflag = up->cflag;
487 int quot, new_baud;
488
489 up->cflag &= ~CBAUD;
490 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
491
492 quot = up->port.uartclk / (16 * new_baud);
493
494 sunsu_change_speed(&up->port, up->cflag, 0, quot);
495 }
496
receive_kbd_ms_chars(struct uart_sunsu_port * up,int is_break)497 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
498 {
499 do {
500 unsigned char ch = serial_inp(up, UART_RX);
501
502 /* Stop-A is handled by drivers/char/keyboard.c now. */
503 if (up->su_type == SU_PORT_KBD) {
504 #ifdef CONFIG_SERIO
505 serio_interrupt(&up->serio, ch, 0);
506 #endif
507 } else if (up->su_type == SU_PORT_MS) {
508 int ret = suncore_mouse_baud_detection(ch, is_break);
509
510 switch (ret) {
511 case 2:
512 sunsu_change_mouse_baud(up);
513 fallthrough;
514 case 1:
515 break;
516
517 case 0:
518 #ifdef CONFIG_SERIO
519 serio_interrupt(&up->serio, ch, 0);
520 #endif
521 break;
522 }
523 }
524 } while (serial_in(up, UART_LSR) & UART_LSR_DR);
525 }
526
sunsu_kbd_ms_interrupt(int irq,void * dev_id)527 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
528 {
529 struct uart_sunsu_port *up = dev_id;
530
531 if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
532 unsigned char status = serial_inp(up, UART_LSR);
533
534 if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
535 receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
536 }
537
538 return IRQ_HANDLED;
539 }
540
sunsu_tx_empty(struct uart_port * port)541 static unsigned int sunsu_tx_empty(struct uart_port *port)
542 {
543 struct uart_sunsu_port *up =
544 container_of(port, struct uart_sunsu_port, port);
545 unsigned long flags;
546 unsigned int ret;
547
548 spin_lock_irqsave(&up->port.lock, flags);
549 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
550 spin_unlock_irqrestore(&up->port.lock, flags);
551
552 return ret;
553 }
554
sunsu_get_mctrl(struct uart_port * port)555 static unsigned int sunsu_get_mctrl(struct uart_port *port)
556 {
557 struct uart_sunsu_port *up =
558 container_of(port, struct uart_sunsu_port, port);
559 unsigned char status;
560 unsigned int ret;
561
562 status = serial_in(up, UART_MSR);
563
564 ret = 0;
565 if (status & UART_MSR_DCD)
566 ret |= TIOCM_CAR;
567 if (status & UART_MSR_RI)
568 ret |= TIOCM_RNG;
569 if (status & UART_MSR_DSR)
570 ret |= TIOCM_DSR;
571 if (status & UART_MSR_CTS)
572 ret |= TIOCM_CTS;
573 return ret;
574 }
575
sunsu_set_mctrl(struct uart_port * port,unsigned int mctrl)576 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
577 {
578 struct uart_sunsu_port *up =
579 container_of(port, struct uart_sunsu_port, port);
580 unsigned char mcr = 0;
581
582 if (mctrl & TIOCM_RTS)
583 mcr |= UART_MCR_RTS;
584 if (mctrl & TIOCM_DTR)
585 mcr |= UART_MCR_DTR;
586 if (mctrl & TIOCM_OUT1)
587 mcr |= UART_MCR_OUT1;
588 if (mctrl & TIOCM_OUT2)
589 mcr |= UART_MCR_OUT2;
590 if (mctrl & TIOCM_LOOP)
591 mcr |= UART_MCR_LOOP;
592
593 serial_out(up, UART_MCR, mcr);
594 }
595
sunsu_break_ctl(struct uart_port * port,int break_state)596 static void sunsu_break_ctl(struct uart_port *port, int break_state)
597 {
598 struct uart_sunsu_port *up =
599 container_of(port, struct uart_sunsu_port, port);
600 unsigned long flags;
601
602 spin_lock_irqsave(&up->port.lock, flags);
603 if (break_state == -1)
604 up->lcr |= UART_LCR_SBC;
605 else
606 up->lcr &= ~UART_LCR_SBC;
607 serial_out(up, UART_LCR, up->lcr);
608 spin_unlock_irqrestore(&up->port.lock, flags);
609 }
610
sunsu_startup(struct uart_port * port)611 static int sunsu_startup(struct uart_port *port)
612 {
613 struct uart_sunsu_port *up =
614 container_of(port, struct uart_sunsu_port, port);
615 unsigned long flags;
616 int retval;
617
618 if (up->port.type == PORT_16C950) {
619 /* Wake up and initialize UART */
620 up->acr = 0;
621 serial_outp(up, UART_LCR, 0xBF);
622 serial_outp(up, UART_EFR, UART_EFR_ECB);
623 serial_outp(up, UART_IER, 0);
624 serial_outp(up, UART_LCR, 0);
625 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
626 serial_outp(up, UART_LCR, 0xBF);
627 serial_outp(up, UART_EFR, UART_EFR_ECB);
628 serial_outp(up, UART_LCR, 0);
629 }
630
631 #ifdef CONFIG_SERIAL_8250_RSA
632 /*
633 * If this is an RSA port, see if we can kick it up to the
634 * higher speed clock.
635 */
636 enable_rsa(up);
637 #endif
638
639 /*
640 * Clear the FIFO buffers and disable them.
641 * (they will be reenabled in set_termios())
642 */
643 if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
644 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
645 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
646 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
647 serial_outp(up, UART_FCR, 0);
648 }
649
650 /*
651 * Clear the interrupt registers.
652 */
653 (void) serial_inp(up, UART_LSR);
654 (void) serial_inp(up, UART_RX);
655 (void) serial_inp(up, UART_IIR);
656 (void) serial_inp(up, UART_MSR);
657
658 /*
659 * At this point, there's no way the LSR could still be 0xff;
660 * if it is, then bail out, because there's likely no UART
661 * here.
662 */
663 if (!(up->port.flags & UPF_BUGGY_UART) &&
664 (serial_inp(up, UART_LSR) == 0xff)) {
665 printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
666 return -ENODEV;
667 }
668
669 if (up->su_type != SU_PORT_PORT) {
670 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
671 IRQF_SHARED, su_typev[up->su_type], up);
672 } else {
673 retval = request_irq(up->port.irq, sunsu_serial_interrupt,
674 IRQF_SHARED, su_typev[up->su_type], up);
675 }
676 if (retval) {
677 printk("su: Cannot register IRQ %d\n", up->port.irq);
678 return retval;
679 }
680
681 /*
682 * Now, initialize the UART
683 */
684 serial_outp(up, UART_LCR, UART_LCR_WLEN8);
685
686 spin_lock_irqsave(&up->port.lock, flags);
687
688 up->port.mctrl |= TIOCM_OUT2;
689
690 sunsu_set_mctrl(&up->port, up->port.mctrl);
691 spin_unlock_irqrestore(&up->port.lock, flags);
692
693 /*
694 * Finally, enable interrupts. Note: Modem status interrupts
695 * are set via set_termios(), which will be occurring imminently
696 * anyway, so we don't enable them here.
697 */
698 up->ier = UART_IER_RLSI | UART_IER_RDI;
699 serial_outp(up, UART_IER, up->ier);
700
701 if (up->port.flags & UPF_FOURPORT) {
702 unsigned int icp;
703 /*
704 * Enable interrupts on the AST Fourport board
705 */
706 icp = (up->port.iobase & 0xfe0) | 0x01f;
707 outb_p(0x80, icp);
708 (void) inb_p(icp);
709 }
710
711 /*
712 * And clear the interrupt registers again for luck.
713 */
714 (void) serial_inp(up, UART_LSR);
715 (void) serial_inp(up, UART_RX);
716 (void) serial_inp(up, UART_IIR);
717 (void) serial_inp(up, UART_MSR);
718
719 return 0;
720 }
721
sunsu_shutdown(struct uart_port * port)722 static void sunsu_shutdown(struct uart_port *port)
723 {
724 struct uart_sunsu_port *up =
725 container_of(port, struct uart_sunsu_port, port);
726 unsigned long flags;
727
728 /*
729 * Disable interrupts from this port
730 */
731 up->ier = 0;
732 serial_outp(up, UART_IER, 0);
733
734 spin_lock_irqsave(&up->port.lock, flags);
735 if (up->port.flags & UPF_FOURPORT) {
736 /* reset interrupts on the AST Fourport board */
737 inb((up->port.iobase & 0xfe0) | 0x1f);
738 up->port.mctrl |= TIOCM_OUT1;
739 } else
740 up->port.mctrl &= ~TIOCM_OUT2;
741
742 sunsu_set_mctrl(&up->port, up->port.mctrl);
743 spin_unlock_irqrestore(&up->port.lock, flags);
744
745 /*
746 * Disable break condition and FIFOs
747 */
748 serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
749 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
750 UART_FCR_CLEAR_RCVR |
751 UART_FCR_CLEAR_XMIT);
752 serial_outp(up, UART_FCR, 0);
753
754 #ifdef CONFIG_SERIAL_8250_RSA
755 /*
756 * Reset the RSA board back to 115kbps compat mode.
757 */
758 disable_rsa(up);
759 #endif
760
761 /*
762 * Read data port to reset things.
763 */
764 (void) serial_in(up, UART_RX);
765
766 free_irq(up->port.irq, up);
767 }
768
769 static void
sunsu_change_speed(struct uart_port * port,unsigned int cflag,unsigned int iflag,unsigned int quot)770 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
771 unsigned int iflag, unsigned int quot)
772 {
773 struct uart_sunsu_port *up =
774 container_of(port, struct uart_sunsu_port, port);
775 unsigned char cval, fcr = 0;
776 unsigned long flags;
777
778 switch (cflag & CSIZE) {
779 case CS5:
780 cval = 0x00;
781 break;
782 case CS6:
783 cval = 0x01;
784 break;
785 case CS7:
786 cval = 0x02;
787 break;
788 default:
789 case CS8:
790 cval = 0x03;
791 break;
792 }
793
794 if (cflag & CSTOPB)
795 cval |= 0x04;
796 if (cflag & PARENB)
797 cval |= UART_LCR_PARITY;
798 if (!(cflag & PARODD))
799 cval |= UART_LCR_EPAR;
800 #ifdef CMSPAR
801 if (cflag & CMSPAR)
802 cval |= UART_LCR_SPAR;
803 #endif
804
805 /*
806 * Work around a bug in the Oxford Semiconductor 952 rev B
807 * chip which causes it to seriously miscalculate baud rates
808 * when DLL is 0.
809 */
810 if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
811 up->rev == 0x5201)
812 quot ++;
813
814 if (uart_config[up->port.type].flags & UART_USE_FIFO) {
815 if ((up->port.uartclk / quot) < (2400 * 16))
816 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
817 #ifdef CONFIG_SERIAL_8250_RSA
818 else if (up->port.type == PORT_RSA)
819 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
820 #endif
821 else
822 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
823 }
824 if (up->port.type == PORT_16750)
825 fcr |= UART_FCR7_64BYTE;
826
827 /*
828 * Ok, we're now changing the port state. Do it with
829 * interrupts disabled.
830 */
831 spin_lock_irqsave(&up->port.lock, flags);
832
833 /*
834 * Update the per-port timeout.
835 */
836 uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
837
838 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
839 if (iflag & INPCK)
840 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
841 if (iflag & (IGNBRK | BRKINT | PARMRK))
842 up->port.read_status_mask |= UART_LSR_BI;
843
844 /*
845 * Characteres to ignore
846 */
847 up->port.ignore_status_mask = 0;
848 if (iflag & IGNPAR)
849 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
850 if (iflag & IGNBRK) {
851 up->port.ignore_status_mask |= UART_LSR_BI;
852 /*
853 * If we're ignoring parity and break indicators,
854 * ignore overruns too (for real raw support).
855 */
856 if (iflag & IGNPAR)
857 up->port.ignore_status_mask |= UART_LSR_OE;
858 }
859
860 /*
861 * ignore all characters if CREAD is not set
862 */
863 if ((cflag & CREAD) == 0)
864 up->port.ignore_status_mask |= UART_LSR_DR;
865
866 /*
867 * CTS flow control flag and modem status interrupts
868 */
869 up->ier &= ~UART_IER_MSI;
870 if (UART_ENABLE_MS(&up->port, cflag))
871 up->ier |= UART_IER_MSI;
872
873 serial_out(up, UART_IER, up->ier);
874
875 if (uart_config[up->port.type].flags & UART_STARTECH) {
876 serial_outp(up, UART_LCR, 0xBF);
877 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
878 }
879 serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
880 serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */
881 serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */
882 if (up->port.type == PORT_16750)
883 serial_outp(up, UART_FCR, fcr); /* set fcr */
884 serial_outp(up, UART_LCR, cval); /* reset DLAB */
885 up->lcr = cval; /* Save LCR */
886 if (up->port.type != PORT_16750) {
887 if (fcr & UART_FCR_ENABLE_FIFO) {
888 /* emulated UARTs (Lucent Venus 167x) need two steps */
889 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
890 }
891 serial_outp(up, UART_FCR, fcr); /* set fcr */
892 }
893
894 up->cflag = cflag;
895
896 spin_unlock_irqrestore(&up->port.lock, flags);
897 }
898
899 static void
sunsu_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)900 sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
901 struct ktermios *old)
902 {
903 unsigned int baud, quot;
904
905 /*
906 * Ask the core to calculate the divisor for us.
907 */
908 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
909 quot = uart_get_divisor(port, baud);
910
911 sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
912 }
913
sunsu_release_port(struct uart_port * port)914 static void sunsu_release_port(struct uart_port *port)
915 {
916 }
917
sunsu_request_port(struct uart_port * port)918 static int sunsu_request_port(struct uart_port *port)
919 {
920 return 0;
921 }
922
sunsu_config_port(struct uart_port * port,int flags)923 static void sunsu_config_port(struct uart_port *port, int flags)
924 {
925 struct uart_sunsu_port *up =
926 container_of(port, struct uart_sunsu_port, port);
927
928 if (flags & UART_CONFIG_TYPE) {
929 /*
930 * We are supposed to call autoconfig here, but this requires
931 * splitting all the OBP probing crap from the UART probing.
932 * We'll do it when we kill sunsu.c altogether.
933 */
934 port->type = up->type_probed; /* XXX */
935 }
936 }
937
938 static int
sunsu_verify_port(struct uart_port * port,struct serial_struct * ser)939 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
940 {
941 return -EINVAL;
942 }
943
944 static const char *
sunsu_type(struct uart_port * port)945 sunsu_type(struct uart_port *port)
946 {
947 int type = port->type;
948
949 if (type >= ARRAY_SIZE(uart_config))
950 type = 0;
951 return uart_config[type].name;
952 }
953
954 static const struct uart_ops sunsu_pops = {
955 .tx_empty = sunsu_tx_empty,
956 .set_mctrl = sunsu_set_mctrl,
957 .get_mctrl = sunsu_get_mctrl,
958 .stop_tx = sunsu_stop_tx,
959 .start_tx = sunsu_start_tx,
960 .stop_rx = sunsu_stop_rx,
961 .enable_ms = sunsu_enable_ms,
962 .break_ctl = sunsu_break_ctl,
963 .startup = sunsu_startup,
964 .shutdown = sunsu_shutdown,
965 .set_termios = sunsu_set_termios,
966 .type = sunsu_type,
967 .release_port = sunsu_release_port,
968 .request_port = sunsu_request_port,
969 .config_port = sunsu_config_port,
970 .verify_port = sunsu_verify_port,
971 };
972
973 #define UART_NR 4
974
975 static struct uart_sunsu_port sunsu_ports[UART_NR];
976 static int nr_inst; /* Number of already registered ports */
977
978 #ifdef CONFIG_SERIO
979
980 static DEFINE_SPINLOCK(sunsu_serio_lock);
981
sunsu_serio_write(struct serio * serio,unsigned char ch)982 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
983 {
984 struct uart_sunsu_port *up = serio->port_data;
985 unsigned long flags;
986 int lsr;
987
988 spin_lock_irqsave(&sunsu_serio_lock, flags);
989
990 do {
991 lsr = serial_in(up, UART_LSR);
992 } while (!(lsr & UART_LSR_THRE));
993
994 /* Send the character out. */
995 serial_out(up, UART_TX, ch);
996
997 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
998
999 return 0;
1000 }
1001
sunsu_serio_open(struct serio * serio)1002 static int sunsu_serio_open(struct serio *serio)
1003 {
1004 struct uart_sunsu_port *up = serio->port_data;
1005 unsigned long flags;
1006 int ret;
1007
1008 spin_lock_irqsave(&sunsu_serio_lock, flags);
1009 if (!up->serio_open) {
1010 up->serio_open = 1;
1011 ret = 0;
1012 } else
1013 ret = -EBUSY;
1014 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1015
1016 return ret;
1017 }
1018
sunsu_serio_close(struct serio * serio)1019 static void sunsu_serio_close(struct serio *serio)
1020 {
1021 struct uart_sunsu_port *up = serio->port_data;
1022 unsigned long flags;
1023
1024 spin_lock_irqsave(&sunsu_serio_lock, flags);
1025 up->serio_open = 0;
1026 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1027 }
1028
1029 #endif /* CONFIG_SERIO */
1030
sunsu_autoconfig(struct uart_sunsu_port * up)1031 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1032 {
1033 unsigned char status1, status2, scratch, scratch2, scratch3;
1034 unsigned char save_lcr, save_mcr;
1035 unsigned long flags;
1036
1037 if (up->su_type == SU_PORT_NONE)
1038 return;
1039
1040 up->type_probed = PORT_UNKNOWN;
1041 up->port.iotype = UPIO_MEM;
1042
1043 spin_lock_irqsave(&up->port.lock, flags);
1044
1045 if (!(up->port.flags & UPF_BUGGY_UART)) {
1046 /*
1047 * Do a simple existence test first; if we fail this, there's
1048 * no point trying anything else.
1049 *
1050 * 0x80 is used as a nonsense port to prevent against false
1051 * positives due to ISA bus float. The assumption is that
1052 * 0x80 is a non-existent port; which should be safe since
1053 * include/asm/io.h also makes this assumption.
1054 */
1055 scratch = serial_inp(up, UART_IER);
1056 serial_outp(up, UART_IER, 0);
1057 #ifdef __i386__
1058 outb(0xff, 0x080);
1059 #endif
1060 scratch2 = serial_inp(up, UART_IER);
1061 serial_outp(up, UART_IER, 0x0f);
1062 #ifdef __i386__
1063 outb(0, 0x080);
1064 #endif
1065 scratch3 = serial_inp(up, UART_IER);
1066 serial_outp(up, UART_IER, scratch);
1067 if (scratch2 != 0 || scratch3 != 0x0F)
1068 goto out; /* We failed; there's nothing here */
1069 }
1070
1071 save_mcr = serial_in(up, UART_MCR);
1072 save_lcr = serial_in(up, UART_LCR);
1073
1074 /*
1075 * Check to see if a UART is really there. Certain broken
1076 * internal modems based on the Rockwell chipset fail this
1077 * test, because they apparently don't implement the loopback
1078 * test mode. So this test is skipped on the COM 1 through
1079 * COM 4 ports. This *should* be safe, since no board
1080 * manufacturer would be stupid enough to design a board
1081 * that conflicts with COM 1-4 --- we hope!
1082 */
1083 if (!(up->port.flags & UPF_SKIP_TEST)) {
1084 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1085 status1 = serial_inp(up, UART_MSR) & 0xF0;
1086 serial_outp(up, UART_MCR, save_mcr);
1087 if (status1 != 0x90)
1088 goto out; /* We failed loopback test */
1089 }
1090 serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */
1091 serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */
1092 serial_outp(up, UART_LCR, 0);
1093 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1094 scratch = serial_in(up, UART_IIR) >> 6;
1095 switch (scratch) {
1096 case 0:
1097 up->port.type = PORT_16450;
1098 break;
1099 case 1:
1100 up->port.type = PORT_UNKNOWN;
1101 break;
1102 case 2:
1103 up->port.type = PORT_16550;
1104 break;
1105 case 3:
1106 up->port.type = PORT_16550A;
1107 break;
1108 }
1109 if (up->port.type == PORT_16550A) {
1110 /* Check for Startech UART's */
1111 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1112 if (serial_in(up, UART_EFR) == 0) {
1113 up->port.type = PORT_16650;
1114 } else {
1115 serial_outp(up, UART_LCR, 0xBF);
1116 if (serial_in(up, UART_EFR) == 0)
1117 up->port.type = PORT_16650V2;
1118 }
1119 }
1120 if (up->port.type == PORT_16550A) {
1121 /* Check for TI 16750 */
1122 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1123 serial_outp(up, UART_FCR,
1124 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1125 scratch = serial_in(up, UART_IIR) >> 5;
1126 if (scratch == 7) {
1127 /*
1128 * If this is a 16750, and not a cheap UART
1129 * clone, then it should only go into 64 byte
1130 * mode if the UART_FCR7_64BYTE bit was set
1131 * while UART_LCR_DLAB was latched.
1132 */
1133 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1134 serial_outp(up, UART_LCR, 0);
1135 serial_outp(up, UART_FCR,
1136 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1137 scratch = serial_in(up, UART_IIR) >> 5;
1138 if (scratch == 6)
1139 up->port.type = PORT_16750;
1140 }
1141 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1142 }
1143 serial_outp(up, UART_LCR, save_lcr);
1144 if (up->port.type == PORT_16450) {
1145 scratch = serial_in(up, UART_SCR);
1146 serial_outp(up, UART_SCR, 0xa5);
1147 status1 = serial_in(up, UART_SCR);
1148 serial_outp(up, UART_SCR, 0x5a);
1149 status2 = serial_in(up, UART_SCR);
1150 serial_outp(up, UART_SCR, scratch);
1151
1152 if ((status1 != 0xa5) || (status2 != 0x5a))
1153 up->port.type = PORT_8250;
1154 }
1155
1156 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1157
1158 if (up->port.type == PORT_UNKNOWN)
1159 goto out;
1160 up->type_probed = up->port.type; /* XXX */
1161
1162 /*
1163 * Reset the UART.
1164 */
1165 #ifdef CONFIG_SERIAL_8250_RSA
1166 if (up->port.type == PORT_RSA)
1167 serial_outp(up, UART_RSA_FRR, 0);
1168 #endif
1169 serial_outp(up, UART_MCR, save_mcr);
1170 serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1171 UART_FCR_CLEAR_RCVR |
1172 UART_FCR_CLEAR_XMIT));
1173 serial_outp(up, UART_FCR, 0);
1174 (void)serial_in(up, UART_RX);
1175 serial_outp(up, UART_IER, 0);
1176
1177 out:
1178 spin_unlock_irqrestore(&up->port.lock, flags);
1179 }
1180
1181 static struct uart_driver sunsu_reg = {
1182 .owner = THIS_MODULE,
1183 .driver_name = "sunsu",
1184 .dev_name = "ttyS",
1185 .major = TTY_MAJOR,
1186 };
1187
sunsu_kbd_ms_init(struct uart_sunsu_port * up)1188 static int sunsu_kbd_ms_init(struct uart_sunsu_port *up)
1189 {
1190 int quot, baud;
1191 #ifdef CONFIG_SERIO
1192 struct serio *serio;
1193 #endif
1194
1195 if (up->su_type == SU_PORT_KBD) {
1196 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1197 baud = 1200;
1198 } else {
1199 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1200 baud = 4800;
1201 }
1202 quot = up->port.uartclk / (16 * baud);
1203
1204 sunsu_autoconfig(up);
1205 if (up->port.type == PORT_UNKNOWN)
1206 return -ENODEV;
1207
1208 printk("%pOF: %s port at %llx, irq %u\n",
1209 up->port.dev->of_node,
1210 (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
1211 (unsigned long long) up->port.mapbase,
1212 up->port.irq);
1213
1214 #ifdef CONFIG_SERIO
1215 serio = &up->serio;
1216 serio->port_data = up;
1217
1218 serio->id.type = SERIO_RS232;
1219 if (up->su_type == SU_PORT_KBD) {
1220 serio->id.proto = SERIO_SUNKBD;
1221 strlcpy(serio->name, "sukbd", sizeof(serio->name));
1222 } else {
1223 serio->id.proto = SERIO_SUN;
1224 serio->id.extra = 1;
1225 strlcpy(serio->name, "sums", sizeof(serio->name));
1226 }
1227 strlcpy(serio->phys,
1228 (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
1229 sizeof(serio->phys));
1230
1231 serio->write = sunsu_serio_write;
1232 serio->open = sunsu_serio_open;
1233 serio->close = sunsu_serio_close;
1234 serio->dev.parent = up->port.dev;
1235
1236 serio_register_port(serio);
1237 #endif
1238
1239 sunsu_change_speed(&up->port, up->cflag, 0, quot);
1240
1241 sunsu_startup(&up->port);
1242 return 0;
1243 }
1244
1245 /*
1246 * ------------------------------------------------------------
1247 * Serial console driver
1248 * ------------------------------------------------------------
1249 */
1250
1251 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1252
1253 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1254
1255 /*
1256 * Wait for transmitter & holding register to empty
1257 */
wait_for_xmitr(struct uart_sunsu_port * up)1258 static void wait_for_xmitr(struct uart_sunsu_port *up)
1259 {
1260 unsigned int status, tmout = 10000;
1261
1262 /* Wait up to 10ms for the character(s) to be sent. */
1263 do {
1264 status = serial_in(up, UART_LSR);
1265
1266 if (status & UART_LSR_BI)
1267 up->lsr_break_flag = UART_LSR_BI;
1268
1269 if (--tmout == 0)
1270 break;
1271 udelay(1);
1272 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1273
1274 /* Wait up to 1s for flow control if necessary */
1275 if (up->port.flags & UPF_CONS_FLOW) {
1276 tmout = 1000000;
1277 while (--tmout &&
1278 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1279 udelay(1);
1280 }
1281 }
1282
sunsu_console_putchar(struct uart_port * port,int ch)1283 static void sunsu_console_putchar(struct uart_port *port, int ch)
1284 {
1285 struct uart_sunsu_port *up =
1286 container_of(port, struct uart_sunsu_port, port);
1287
1288 wait_for_xmitr(up);
1289 serial_out(up, UART_TX, ch);
1290 }
1291
1292 /*
1293 * Print a string to the serial port trying not to disturb
1294 * any possible real use of the port...
1295 */
sunsu_console_write(struct console * co,const char * s,unsigned int count)1296 static void sunsu_console_write(struct console *co, const char *s,
1297 unsigned int count)
1298 {
1299 struct uart_sunsu_port *up = &sunsu_ports[co->index];
1300 unsigned long flags;
1301 unsigned int ier;
1302 int locked = 1;
1303
1304 if (up->port.sysrq || oops_in_progress)
1305 locked = spin_trylock_irqsave(&up->port.lock, flags);
1306 else
1307 spin_lock_irqsave(&up->port.lock, flags);
1308
1309 /*
1310 * First save the UER then disable the interrupts
1311 */
1312 ier = serial_in(up, UART_IER);
1313 serial_out(up, UART_IER, 0);
1314
1315 uart_console_write(&up->port, s, count, sunsu_console_putchar);
1316
1317 /*
1318 * Finally, wait for transmitter to become empty
1319 * and restore the IER
1320 */
1321 wait_for_xmitr(up);
1322 serial_out(up, UART_IER, ier);
1323
1324 if (locked)
1325 spin_unlock_irqrestore(&up->port.lock, flags);
1326 }
1327
1328 /*
1329 * Setup initial baud/bits/parity. We do two things here:
1330 * - construct a cflag setting for the first su_open()
1331 * - initialize the serial port
1332 * Return non-zero if we didn't find a serial port.
1333 */
sunsu_console_setup(struct console * co,char * options)1334 static int __init sunsu_console_setup(struct console *co, char *options)
1335 {
1336 static struct ktermios dummy;
1337 struct ktermios termios;
1338 struct uart_port *port;
1339
1340 printk("Console: ttyS%d (SU)\n",
1341 (sunsu_reg.minor - 64) + co->index);
1342
1343 if (co->index > nr_inst)
1344 return -ENODEV;
1345 port = &sunsu_ports[co->index].port;
1346
1347 /*
1348 * Temporary fix.
1349 */
1350 spin_lock_init(&port->lock);
1351
1352 /* Get firmware console settings. */
1353 sunserial_console_termios(co, port->dev->of_node);
1354
1355 memset(&termios, 0, sizeof(struct ktermios));
1356 termios.c_cflag = co->cflag;
1357 port->mctrl |= TIOCM_DTR;
1358 port->ops->set_termios(port, &termios, &dummy);
1359
1360 return 0;
1361 }
1362
1363 static struct console sunsu_console = {
1364 .name = "ttyS",
1365 .write = sunsu_console_write,
1366 .device = uart_console_device,
1367 .setup = sunsu_console_setup,
1368 .flags = CON_PRINTBUFFER,
1369 .index = -1,
1370 .data = &sunsu_reg,
1371 };
1372
1373 /*
1374 * Register console.
1375 */
1376
SUNSU_CONSOLE(void)1377 static inline struct console *SUNSU_CONSOLE(void)
1378 {
1379 return &sunsu_console;
1380 }
1381 #else
1382 #define SUNSU_CONSOLE() (NULL)
1383 #define sunsu_serial_console_init() do { } while (0)
1384 #endif
1385
su_get_type(struct device_node * dp)1386 static enum su_type su_get_type(struct device_node *dp)
1387 {
1388 struct device_node *ap = of_find_node_by_path("/aliases");
1389 enum su_type rc = SU_PORT_PORT;
1390
1391 if (ap) {
1392 const char *keyb = of_get_property(ap, "keyboard", NULL);
1393 const char *ms = of_get_property(ap, "mouse", NULL);
1394 struct device_node *match;
1395
1396 if (keyb) {
1397 match = of_find_node_by_path(keyb);
1398
1399 /*
1400 * The pointer is used as an identifier not
1401 * as a pointer, we can drop the refcount on
1402 * the of__node immediately after getting it.
1403 */
1404 of_node_put(match);
1405
1406 if (dp == match) {
1407 rc = SU_PORT_KBD;
1408 goto out;
1409 }
1410 }
1411 if (ms) {
1412 match = of_find_node_by_path(ms);
1413
1414 of_node_put(match);
1415
1416 if (dp == match) {
1417 rc = SU_PORT_MS;
1418 goto out;
1419 }
1420 }
1421 }
1422
1423 out:
1424 of_node_put(ap);
1425 return rc;
1426 }
1427
su_probe(struct platform_device * op)1428 static int su_probe(struct platform_device *op)
1429 {
1430 struct device_node *dp = op->dev.of_node;
1431 struct uart_sunsu_port *up;
1432 struct resource *rp;
1433 enum su_type type;
1434 bool ignore_line;
1435 int err;
1436
1437 type = su_get_type(dp);
1438 if (type == SU_PORT_PORT) {
1439 if (nr_inst >= UART_NR)
1440 return -EINVAL;
1441 up = &sunsu_ports[nr_inst];
1442 } else {
1443 up = kzalloc(sizeof(*up), GFP_KERNEL);
1444 if (!up)
1445 return -ENOMEM;
1446 }
1447
1448 up->port.line = nr_inst;
1449
1450 spin_lock_init(&up->port.lock);
1451
1452 up->su_type = type;
1453
1454 rp = &op->resource[0];
1455 up->port.mapbase = rp->start;
1456 up->reg_size = resource_size(rp);
1457 up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
1458 if (!up->port.membase) {
1459 if (type != SU_PORT_PORT)
1460 kfree(up);
1461 return -ENOMEM;
1462 }
1463
1464 up->port.irq = op->archdata.irqs[0];
1465
1466 up->port.dev = &op->dev;
1467
1468 up->port.type = PORT_UNKNOWN;
1469 up->port.uartclk = (SU_BASE_BAUD * 16);
1470 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE);
1471
1472 err = 0;
1473 if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
1474 err = sunsu_kbd_ms_init(up);
1475 if (err) {
1476 of_iounmap(&op->resource[0],
1477 up->port.membase, up->reg_size);
1478 kfree(up);
1479 return err;
1480 }
1481 platform_set_drvdata(op, up);
1482
1483 nr_inst++;
1484
1485 return 0;
1486 }
1487
1488 up->port.flags |= UPF_BOOT_AUTOCONF;
1489
1490 sunsu_autoconfig(up);
1491
1492 err = -ENODEV;
1493 if (up->port.type == PORT_UNKNOWN)
1494 goto out_unmap;
1495
1496 up->port.ops = &sunsu_pops;
1497
1498 ignore_line = false;
1499 if (of_node_name_eq(dp, "rsc-console") ||
1500 of_node_name_eq(dp, "lom-console"))
1501 ignore_line = true;
1502
1503 sunserial_console_match(SUNSU_CONSOLE(), dp,
1504 &sunsu_reg, up->port.line,
1505 ignore_line);
1506 err = uart_add_one_port(&sunsu_reg, &up->port);
1507 if (err)
1508 goto out_unmap;
1509
1510 platform_set_drvdata(op, up);
1511
1512 nr_inst++;
1513
1514 return 0;
1515
1516 out_unmap:
1517 of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1518 kfree(up);
1519 return err;
1520 }
1521
su_remove(struct platform_device * op)1522 static int su_remove(struct platform_device *op)
1523 {
1524 struct uart_sunsu_port *up = platform_get_drvdata(op);
1525 bool kbdms = false;
1526
1527 if (up->su_type == SU_PORT_MS ||
1528 up->su_type == SU_PORT_KBD)
1529 kbdms = true;
1530
1531 if (kbdms) {
1532 #ifdef CONFIG_SERIO
1533 serio_unregister_port(&up->serio);
1534 #endif
1535 } else if (up->port.type != PORT_UNKNOWN)
1536 uart_remove_one_port(&sunsu_reg, &up->port);
1537
1538 if (up->port.membase)
1539 of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1540
1541 if (kbdms)
1542 kfree(up);
1543
1544 return 0;
1545 }
1546
1547 static const struct of_device_id su_match[] = {
1548 {
1549 .name = "su",
1550 },
1551 {
1552 .name = "su_pnp",
1553 },
1554 {
1555 .name = "serial",
1556 .compatible = "su",
1557 },
1558 {
1559 .type = "serial",
1560 .compatible = "su",
1561 },
1562 {},
1563 };
1564 MODULE_DEVICE_TABLE(of, su_match);
1565
1566 static struct platform_driver su_driver = {
1567 .driver = {
1568 .name = "su",
1569 .of_match_table = su_match,
1570 },
1571 .probe = su_probe,
1572 .remove = su_remove,
1573 };
1574
sunsu_init(void)1575 static int __init sunsu_init(void)
1576 {
1577 struct device_node *dp;
1578 int err;
1579 int num_uart = 0;
1580
1581 for_each_node_by_name(dp, "su") {
1582 if (su_get_type(dp) == SU_PORT_PORT)
1583 num_uart++;
1584 }
1585 for_each_node_by_name(dp, "su_pnp") {
1586 if (su_get_type(dp) == SU_PORT_PORT)
1587 num_uart++;
1588 }
1589 for_each_node_by_name(dp, "serial") {
1590 if (of_device_is_compatible(dp, "su")) {
1591 if (su_get_type(dp) == SU_PORT_PORT)
1592 num_uart++;
1593 }
1594 }
1595 for_each_node_by_type(dp, "serial") {
1596 if (of_device_is_compatible(dp, "su")) {
1597 if (su_get_type(dp) == SU_PORT_PORT)
1598 num_uart++;
1599 }
1600 }
1601
1602 if (num_uart) {
1603 err = sunserial_register_minors(&sunsu_reg, num_uart);
1604 if (err)
1605 return err;
1606 }
1607
1608 err = platform_driver_register(&su_driver);
1609 if (err && num_uart)
1610 sunserial_unregister_minors(&sunsu_reg, num_uart);
1611
1612 return err;
1613 }
1614
sunsu_exit(void)1615 static void __exit sunsu_exit(void)
1616 {
1617 platform_driver_unregister(&su_driver);
1618 if (sunsu_reg.nr)
1619 sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
1620 }
1621
1622 module_init(sunsu_init);
1623 module_exit(sunsu_exit);
1624
1625 MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
1626 MODULE_DESCRIPTION("Sun SU serial port driver");
1627 MODULE_VERSION("2.0");
1628 MODULE_LICENSE("GPL");
1629
