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.h>
41 #include <linux/platform_device.h>
42
43 #include <linux/io.h>
44 #include <asm/irq.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
131 * 8250_alpha.c.
132 */
133 if (offset == UART_MCR)
134 value |= UART_MCR_OUT2;
135 #endif
136 offset <<= up->port.regshift;
137
138 switch (up->port.iotype) {
139 case UPIO_HUB6:
140 outb(up->port.hub6 - 1 + offset, up->port.iobase);
141 outb(value, up->port.iobase + 1);
142 break;
143
144 case UPIO_MEM:
145 writeb(value, up->port.membase + offset);
146 break;
147
148 default:
149 outb(value, up->port.iobase + offset);
150 }
151 }
152
153 /*
154 * We used to support using pause I/O for certain machines. We
155 * haven't supported this for a while, but just in case it's badly
156 * needed for certain old 386 machines, I've left these #define's
157 * in....
158 */
159 #define serial_inp(up, offset) serial_in(up, offset)
160 #define serial_outp(up, offset, value) serial_out(up, offset, value)
161
162
163 /*
164 * For the 16C950
165 */
serial_icr_write(struct uart_sunsu_port * up,int offset,int value)166 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
167 {
168 serial_out(up, UART_SCR, offset);
169 serial_out(up, UART_ICR, value);
170 }
171
172 #if 0 /* Unused currently */
173 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
174 {
175 unsigned int value;
176
177 serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
178 serial_out(up, UART_SCR, offset);
179 value = serial_in(up, UART_ICR);
180 serial_icr_write(up, UART_ACR, up->acr);
181
182 return value;
183 }
184 #endif
185
186 #ifdef CONFIG_SERIAL_8250_RSA
187 /*
188 * Attempts to turn on the RSA FIFO. Returns zero on failure.
189 * We set the port uart clock rate if we succeed.
190 */
__enable_rsa(struct uart_sunsu_port * up)191 static int __enable_rsa(struct uart_sunsu_port *up)
192 {
193 unsigned char mode;
194 int result;
195
196 mode = serial_inp(up, UART_RSA_MSR);
197 result = mode & UART_RSA_MSR_FIFO;
198
199 if (!result) {
200 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
201 mode = serial_inp(up, UART_RSA_MSR);
202 result = mode & UART_RSA_MSR_FIFO;
203 }
204
205 if (result)
206 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
207
208 return result;
209 }
210
enable_rsa(struct uart_sunsu_port * up)211 static void enable_rsa(struct uart_sunsu_port *up)
212 {
213 if (up->port.type == PORT_RSA) {
214 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
215 spin_lock_irq(&up->port.lock);
216 __enable_rsa(up);
217 spin_unlock_irq(&up->port.lock);
218 }
219 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
220 serial_outp(up, UART_RSA_FRR, 0);
221 }
222 }
223
224 /*
225 * Attempts to turn off the RSA FIFO. Returns zero on failure.
226 * It is unknown why interrupts were disabled in here. However,
227 * the caller is expected to preserve this behaviour by grabbing
228 * the spinlock before calling this function.
229 */
disable_rsa(struct uart_sunsu_port * up)230 static void disable_rsa(struct uart_sunsu_port *up)
231 {
232 unsigned char mode;
233 int result;
234
235 if (up->port.type == PORT_RSA &&
236 up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
237 spin_lock_irq(&up->port.lock);
238
239 mode = serial_inp(up, UART_RSA_MSR);
240 result = !(mode & UART_RSA_MSR_FIFO);
241
242 if (!result) {
243 serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
244 mode = serial_inp(up, UART_RSA_MSR);
245 result = !(mode & UART_RSA_MSR_FIFO);
246 }
247
248 if (result)
249 up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
250 spin_unlock_irq(&up->port.lock);
251 }
252 }
253 #endif /* CONFIG_SERIAL_8250_RSA */
254
__stop_tx(struct uart_sunsu_port * p)255 static inline void __stop_tx(struct uart_sunsu_port *p)
256 {
257 if (p->ier & UART_IER_THRI) {
258 p->ier &= ~UART_IER_THRI;
259 serial_out(p, UART_IER, p->ier);
260 }
261 }
262
sunsu_stop_tx(struct uart_port * port)263 static void sunsu_stop_tx(struct uart_port *port)
264 {
265 struct uart_sunsu_port *up =
266 container_of(port, struct uart_sunsu_port, port);
267
268 __stop_tx(up);
269
270 /*
271 * We really want to stop the transmitter from sending.
272 */
273 if (up->port.type == PORT_16C950) {
274 up->acr |= UART_ACR_TXDIS;
275 serial_icr_write(up, UART_ACR, up->acr);
276 }
277 }
278
sunsu_start_tx(struct uart_port * port)279 static void sunsu_start_tx(struct uart_port *port)
280 {
281 struct uart_sunsu_port *up =
282 container_of(port, struct uart_sunsu_port, port);
283
284 if (!(up->ier & UART_IER_THRI)) {
285 up->ier |= UART_IER_THRI;
286 serial_out(up, UART_IER, up->ier);
287 }
288
289 /*
290 * Re-enable the transmitter if we disabled it.
291 */
292 if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
293 up->acr &= ~UART_ACR_TXDIS;
294 serial_icr_write(up, UART_ACR, up->acr);
295 }
296 }
297
sunsu_stop_rx(struct uart_port * port)298 static void sunsu_stop_rx(struct uart_port *port)
299 {
300 struct uart_sunsu_port *up =
301 container_of(port, struct uart_sunsu_port, port);
302
303 up->ier &= ~UART_IER_RLSI;
304 up->port.read_status_mask &= ~UART_LSR_DR;
305 serial_out(up, UART_IER, up->ier);
306 }
307
sunsu_enable_ms(struct uart_port * port)308 static void sunsu_enable_ms(struct uart_port *port)
309 {
310 struct uart_sunsu_port *up =
311 container_of(port, struct uart_sunsu_port, port);
312 unsigned long flags;
313
314 spin_lock_irqsave(&up->port.lock, flags);
315 up->ier |= UART_IER_MSI;
316 serial_out(up, UART_IER, up->ier);
317 spin_unlock_irqrestore(&up->port.lock, flags);
318 }
319
320 static void
receive_chars(struct uart_sunsu_port * up,unsigned char * status)321 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
322 {
323 struct tty_port *port = &up->port.state->port;
324 unsigned char ch, flag;
325 int max_count = 256;
326 int saw_console_brk = 0;
327
328 do {
329 ch = serial_inp(up, UART_RX);
330 flag = TTY_NORMAL;
331 up->port.icount.rx++;
332
333 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
334 UART_LSR_FE | UART_LSR_OE))) {
335 /*
336 * For statistics only
337 */
338 if (*status & UART_LSR_BI) {
339 *status &= ~(UART_LSR_FE | UART_LSR_PE);
340 up->port.icount.brk++;
341 if (up->port.cons != NULL &&
342 up->port.line == up->port.cons->index)
343 saw_console_brk = 1;
344 /*
345 * We do the SysRQ and SAK checking
346 * here because otherwise the break
347 * may get masked by ignore_status_mask
348 * or read_status_mask.
349 */
350 if (uart_handle_break(&up->port))
351 goto ignore_char;
352 } else if (*status & UART_LSR_PE)
353 up->port.icount.parity++;
354 else if (*status & UART_LSR_FE)
355 up->port.icount.frame++;
356 if (*status & UART_LSR_OE)
357 up->port.icount.overrun++;
358
359 /*
360 * Mask off conditions which should be ingored.
361 */
362 *status &= up->port.read_status_mask;
363
364 if (up->port.cons != NULL &&
365 up->port.line == up->port.cons->index) {
366 /* Recover the break flag from console xmit */
367 *status |= up->lsr_break_flag;
368 up->lsr_break_flag = 0;
369 }
370
371 if (*status & UART_LSR_BI) {
372 flag = TTY_BREAK;
373 } else if (*status & UART_LSR_PE)
374 flag = TTY_PARITY;
375 else if (*status & UART_LSR_FE)
376 flag = TTY_FRAME;
377 }
378 if (uart_handle_sysrq_char(&up->port, ch))
379 goto ignore_char;
380 if ((*status & up->port.ignore_status_mask) == 0)
381 tty_insert_flip_char(port, ch, flag);
382 if (*status & UART_LSR_OE)
383 /*
384 * Overrun is special, since it's reported
385 * immediately, and doesn't affect the current
386 * character.
387 */
388 tty_insert_flip_char(port, 0, TTY_OVERRUN);
389 ignore_char:
390 *status = serial_inp(up, UART_LSR);
391 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
392
393 if (saw_console_brk)
394 sun_do_break();
395 }
396
transmit_chars(struct uart_sunsu_port * up)397 static void transmit_chars(struct uart_sunsu_port *up)
398 {
399 struct circ_buf *xmit = &up->port.state->xmit;
400 int count;
401
402 if (up->port.x_char) {
403 serial_outp(up, UART_TX, up->port.x_char);
404 up->port.icount.tx++;
405 up->port.x_char = 0;
406 return;
407 }
408 if (uart_tx_stopped(&up->port)) {
409 sunsu_stop_tx(&up->port);
410 return;
411 }
412 if (uart_circ_empty(xmit)) {
413 __stop_tx(up);
414 return;
415 }
416
417 count = up->port.fifosize;
418 do {
419 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
420 uart_xmit_advance(&up->port, 1);
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 if (cflag & CMSPAR)
801 cval |= UART_LCR_SPAR;
802
803 /*
804 * Work around a bug in the Oxford Semiconductor 952 rev B
805 * chip which causes it to seriously miscalculate baud rates
806 * when DLL is 0.
807 */
808 if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
809 up->rev == 0x5201)
810 quot ++;
811
812 if (uart_config[up->port.type].flags & UART_USE_FIFO) {
813 if ((up->port.uartclk / quot) < (2400 * 16))
814 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
815 #ifdef CONFIG_SERIAL_8250_RSA
816 else if (up->port.type == PORT_RSA)
817 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
818 #endif
819 else
820 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
821 }
822 if (up->port.type == PORT_16750)
823 fcr |= UART_FCR7_64BYTE;
824
825 /*
826 * Ok, we're now changing the port state. Do it with
827 * interrupts disabled.
828 */
829 spin_lock_irqsave(&up->port.lock, flags);
830
831 /*
832 * Update the per-port timeout.
833 */
834 uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
835
836 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
837 if (iflag & INPCK)
838 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
839 if (iflag & (IGNBRK | BRKINT | PARMRK))
840 up->port.read_status_mask |= UART_LSR_BI;
841
842 /*
843 * Characteres to ignore
844 */
845 up->port.ignore_status_mask = 0;
846 if (iflag & IGNPAR)
847 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
848 if (iflag & IGNBRK) {
849 up->port.ignore_status_mask |= UART_LSR_BI;
850 /*
851 * If we're ignoring parity and break indicators,
852 * ignore overruns too (for real raw support).
853 */
854 if (iflag & IGNPAR)
855 up->port.ignore_status_mask |= UART_LSR_OE;
856 }
857
858 /*
859 * ignore all characters if CREAD is not set
860 */
861 if ((cflag & CREAD) == 0)
862 up->port.ignore_status_mask |= UART_LSR_DR;
863
864 /*
865 * CTS flow control flag and modem status interrupts
866 */
867 up->ier &= ~UART_IER_MSI;
868 if (UART_ENABLE_MS(&up->port, cflag))
869 up->ier |= UART_IER_MSI;
870
871 serial_out(up, UART_IER, up->ier);
872
873 if (uart_config[up->port.type].flags & UART_STARTECH) {
874 serial_outp(up, UART_LCR, 0xBF);
875 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
876 }
877 serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
878 serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */
879 serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */
880 if (up->port.type == PORT_16750)
881 serial_outp(up, UART_FCR, fcr); /* set fcr */
882 serial_outp(up, UART_LCR, cval); /* reset DLAB */
883 up->lcr = cval; /* Save LCR */
884 if (up->port.type != PORT_16750) {
885 if (fcr & UART_FCR_ENABLE_FIFO) {
886 /* emulated UARTs (Lucent Venus 167x) need two steps */
887 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
888 }
889 serial_outp(up, UART_FCR, fcr); /* set fcr */
890 }
891
892 up->cflag = cflag;
893
894 spin_unlock_irqrestore(&up->port.lock, flags);
895 }
896
897 static void
sunsu_set_termios(struct uart_port * port,struct ktermios * termios,const struct ktermios * old)898 sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
899 const struct ktermios *old)
900 {
901 unsigned int baud, quot;
902
903 /*
904 * Ask the core to calculate the divisor for us.
905 */
906 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
907 quot = uart_get_divisor(port, baud);
908
909 sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
910 }
911
sunsu_release_port(struct uart_port * port)912 static void sunsu_release_port(struct uart_port *port)
913 {
914 }
915
sunsu_request_port(struct uart_port * port)916 static int sunsu_request_port(struct uart_port *port)
917 {
918 return 0;
919 }
920
sunsu_config_port(struct uart_port * port,int flags)921 static void sunsu_config_port(struct uart_port *port, int flags)
922 {
923 struct uart_sunsu_port *up =
924 container_of(port, struct uart_sunsu_port, port);
925
926 if (flags & UART_CONFIG_TYPE) {
927 /*
928 * We are supposed to call autoconfig here, but this requires
929 * splitting all the OBP probing crap from the UART probing.
930 * We'll do it when we kill sunsu.c altogether.
931 */
932 port->type = up->type_probed; /* XXX */
933 }
934 }
935
936 static int
sunsu_verify_port(struct uart_port * port,struct serial_struct * ser)937 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
938 {
939 return -EINVAL;
940 }
941
942 static const char *
sunsu_type(struct uart_port * port)943 sunsu_type(struct uart_port *port)
944 {
945 int type = port->type;
946
947 if (type >= ARRAY_SIZE(uart_config))
948 type = 0;
949 return uart_config[type].name;
950 }
951
952 static const struct uart_ops sunsu_pops = {
953 .tx_empty = sunsu_tx_empty,
954 .set_mctrl = sunsu_set_mctrl,
955 .get_mctrl = sunsu_get_mctrl,
956 .stop_tx = sunsu_stop_tx,
957 .start_tx = sunsu_start_tx,
958 .stop_rx = sunsu_stop_rx,
959 .enable_ms = sunsu_enable_ms,
960 .break_ctl = sunsu_break_ctl,
961 .startup = sunsu_startup,
962 .shutdown = sunsu_shutdown,
963 .set_termios = sunsu_set_termios,
964 .type = sunsu_type,
965 .release_port = sunsu_release_port,
966 .request_port = sunsu_request_port,
967 .config_port = sunsu_config_port,
968 .verify_port = sunsu_verify_port,
969 };
970
971 #define UART_NR 4
972
973 static struct uart_sunsu_port sunsu_ports[UART_NR];
974 static int nr_inst; /* Number of already registered ports */
975
976 #ifdef CONFIG_SERIO
977
978 static DEFINE_SPINLOCK(sunsu_serio_lock);
979
sunsu_serio_write(struct serio * serio,unsigned char ch)980 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
981 {
982 struct uart_sunsu_port *up = serio->port_data;
983 unsigned long flags;
984 int lsr;
985
986 spin_lock_irqsave(&sunsu_serio_lock, flags);
987
988 do {
989 lsr = serial_in(up, UART_LSR);
990 } while (!(lsr & UART_LSR_THRE));
991
992 /* Send the character out. */
993 serial_out(up, UART_TX, ch);
994
995 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
996
997 return 0;
998 }
999
sunsu_serio_open(struct serio * serio)1000 static int sunsu_serio_open(struct serio *serio)
1001 {
1002 struct uart_sunsu_port *up = serio->port_data;
1003 unsigned long flags;
1004 int ret;
1005
1006 spin_lock_irqsave(&sunsu_serio_lock, flags);
1007 if (!up->serio_open) {
1008 up->serio_open = 1;
1009 ret = 0;
1010 } else
1011 ret = -EBUSY;
1012 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1013
1014 return ret;
1015 }
1016
sunsu_serio_close(struct serio * serio)1017 static void sunsu_serio_close(struct serio *serio)
1018 {
1019 struct uart_sunsu_port *up = serio->port_data;
1020 unsigned long flags;
1021
1022 spin_lock_irqsave(&sunsu_serio_lock, flags);
1023 up->serio_open = 0;
1024 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1025 }
1026
1027 #endif /* CONFIG_SERIO */
1028
sunsu_autoconfig(struct uart_sunsu_port * up)1029 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1030 {
1031 unsigned char status1, status2, scratch, scratch2, scratch3;
1032 unsigned char save_lcr, save_mcr;
1033 unsigned long flags;
1034
1035 if (up->su_type == SU_PORT_NONE)
1036 return;
1037
1038 up->type_probed = PORT_UNKNOWN;
1039 up->port.iotype = UPIO_MEM;
1040
1041 spin_lock_irqsave(&up->port.lock, flags);
1042
1043 if (!(up->port.flags & UPF_BUGGY_UART)) {
1044 /*
1045 * Do a simple existence test first; if we fail this, there's
1046 * no point trying anything else.
1047 *
1048 * 0x80 is used as a nonsense port to prevent against false
1049 * positives due to ISA bus float. The assumption is that
1050 * 0x80 is a non-existent port; which should be safe since
1051 * include/asm/io.h also makes this assumption.
1052 */
1053 scratch = serial_inp(up, UART_IER);
1054 serial_outp(up, UART_IER, 0);
1055 #ifdef __i386__
1056 outb(0xff, 0x080);
1057 #endif
1058 scratch2 = serial_inp(up, UART_IER);
1059 serial_outp(up, UART_IER, 0x0f);
1060 #ifdef __i386__
1061 outb(0, 0x080);
1062 #endif
1063 scratch3 = serial_inp(up, UART_IER);
1064 serial_outp(up, UART_IER, scratch);
1065 if (scratch2 != 0 || scratch3 != 0x0F)
1066 goto out; /* We failed; there's nothing here */
1067 }
1068
1069 save_mcr = serial_in(up, UART_MCR);
1070 save_lcr = serial_in(up, UART_LCR);
1071
1072 /*
1073 * Check to see if a UART is really there. Certain broken
1074 * internal modems based on the Rockwell chipset fail this
1075 * test, because they apparently don't implement the loopback
1076 * test mode. So this test is skipped on the COM 1 through
1077 * COM 4 ports. This *should* be safe, since no board
1078 * manufacturer would be stupid enough to design a board
1079 * that conflicts with COM 1-4 --- we hope!
1080 */
1081 if (!(up->port.flags & UPF_SKIP_TEST)) {
1082 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1083 status1 = serial_inp(up, UART_MSR) & 0xF0;
1084 serial_outp(up, UART_MCR, save_mcr);
1085 if (status1 != 0x90)
1086 goto out; /* We failed loopback test */
1087 }
1088 serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */
1089 serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */
1090 serial_outp(up, UART_LCR, 0);
1091 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1092 scratch = serial_in(up, UART_IIR) >> 6;
1093 switch (scratch) {
1094 case 0:
1095 up->port.type = PORT_16450;
1096 break;
1097 case 1:
1098 up->port.type = PORT_UNKNOWN;
1099 break;
1100 case 2:
1101 up->port.type = PORT_16550;
1102 break;
1103 case 3:
1104 up->port.type = PORT_16550A;
1105 break;
1106 }
1107 if (up->port.type == PORT_16550A) {
1108 /* Check for Startech UART's */
1109 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1110 if (serial_in(up, UART_EFR) == 0) {
1111 up->port.type = PORT_16650;
1112 } else {
1113 serial_outp(up, UART_LCR, 0xBF);
1114 if (serial_in(up, UART_EFR) == 0)
1115 up->port.type = PORT_16650V2;
1116 }
1117 }
1118 if (up->port.type == PORT_16550A) {
1119 /* Check for TI 16750 */
1120 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1121 serial_outp(up, UART_FCR,
1122 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1123 scratch = serial_in(up, UART_IIR) >> 5;
1124 if (scratch == 7) {
1125 /*
1126 * If this is a 16750, and not a cheap UART
1127 * clone, then it should only go into 64 byte
1128 * mode if the UART_FCR7_64BYTE bit was set
1129 * while UART_LCR_DLAB was latched.
1130 */
1131 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1132 serial_outp(up, UART_LCR, 0);
1133 serial_outp(up, UART_FCR,
1134 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1135 scratch = serial_in(up, UART_IIR) >> 5;
1136 if (scratch == 6)
1137 up->port.type = PORT_16750;
1138 }
1139 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1140 }
1141 serial_outp(up, UART_LCR, save_lcr);
1142 if (up->port.type == PORT_16450) {
1143 scratch = serial_in(up, UART_SCR);
1144 serial_outp(up, UART_SCR, 0xa5);
1145 status1 = serial_in(up, UART_SCR);
1146 serial_outp(up, UART_SCR, 0x5a);
1147 status2 = serial_in(up, UART_SCR);
1148 serial_outp(up, UART_SCR, scratch);
1149
1150 if ((status1 != 0xa5) || (status2 != 0x5a))
1151 up->port.type = PORT_8250;
1152 }
1153
1154 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1155
1156 if (up->port.type == PORT_UNKNOWN)
1157 goto out;
1158 up->type_probed = up->port.type; /* XXX */
1159
1160 /*
1161 * Reset the UART.
1162 */
1163 #ifdef CONFIG_SERIAL_8250_RSA
1164 if (up->port.type == PORT_RSA)
1165 serial_outp(up, UART_RSA_FRR, 0);
1166 #endif
1167 serial_outp(up, UART_MCR, save_mcr);
1168 serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1169 UART_FCR_CLEAR_RCVR |
1170 UART_FCR_CLEAR_XMIT));
1171 serial_outp(up, UART_FCR, 0);
1172 (void)serial_in(up, UART_RX);
1173 serial_outp(up, UART_IER, 0);
1174
1175 out:
1176 spin_unlock_irqrestore(&up->port.lock, flags);
1177 }
1178
1179 static struct uart_driver sunsu_reg = {
1180 .owner = THIS_MODULE,
1181 .driver_name = "sunsu",
1182 .dev_name = "ttyS",
1183 .major = TTY_MAJOR,
1184 };
1185
sunsu_kbd_ms_init(struct uart_sunsu_port * up)1186 static int sunsu_kbd_ms_init(struct uart_sunsu_port *up)
1187 {
1188 int quot, baud;
1189 #ifdef CONFIG_SERIO
1190 struct serio *serio;
1191 #endif
1192
1193 if (up->su_type == SU_PORT_KBD) {
1194 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1195 baud = 1200;
1196 } else {
1197 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1198 baud = 4800;
1199 }
1200 quot = up->port.uartclk / (16 * baud);
1201
1202 sunsu_autoconfig(up);
1203 if (up->port.type == PORT_UNKNOWN)
1204 return -ENODEV;
1205
1206 printk("%pOF: %s port at %llx, irq %u\n",
1207 up->port.dev->of_node,
1208 (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
1209 (unsigned long long) up->port.mapbase,
1210 up->port.irq);
1211
1212 #ifdef CONFIG_SERIO
1213 serio = &up->serio;
1214 serio->port_data = up;
1215
1216 serio->id.type = SERIO_RS232;
1217 if (up->su_type == SU_PORT_KBD) {
1218 serio->id.proto = SERIO_SUNKBD;
1219 strscpy(serio->name, "sukbd", sizeof(serio->name));
1220 } else {
1221 serio->id.proto = SERIO_SUN;
1222 serio->id.extra = 1;
1223 strscpy(serio->name, "sums", sizeof(serio->name));
1224 }
1225 strscpy(serio->phys,
1226 (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
1227 sizeof(serio->phys));
1228
1229 serio->write = sunsu_serio_write;
1230 serio->open = sunsu_serio_open;
1231 serio->close = sunsu_serio_close;
1232 serio->dev.parent = up->port.dev;
1233
1234 serio_register_port(serio);
1235 #endif
1236
1237 sunsu_change_speed(&up->port, up->cflag, 0, quot);
1238
1239 sunsu_startup(&up->port);
1240 return 0;
1241 }
1242
1243 /*
1244 * ------------------------------------------------------------
1245 * Serial console driver
1246 * ------------------------------------------------------------
1247 */
1248
1249 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1250
1251 /*
1252 * Wait for transmitter & holding register to empty
1253 */
wait_for_xmitr(struct uart_sunsu_port * up)1254 static void wait_for_xmitr(struct uart_sunsu_port *up)
1255 {
1256 unsigned int status, tmout = 10000;
1257
1258 /* Wait up to 10ms for the character(s) to be sent. */
1259 do {
1260 status = serial_in(up, UART_LSR);
1261
1262 if (status & UART_LSR_BI)
1263 up->lsr_break_flag = UART_LSR_BI;
1264
1265 if (--tmout == 0)
1266 break;
1267 udelay(1);
1268 } while (!uart_lsr_tx_empty(status));
1269
1270 /* Wait up to 1s for flow control if necessary */
1271 if (up->port.flags & UPF_CONS_FLOW) {
1272 tmout = 1000000;
1273 while (--tmout &&
1274 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1275 udelay(1);
1276 }
1277 }
1278
sunsu_console_putchar(struct uart_port * port,unsigned char ch)1279 static void sunsu_console_putchar(struct uart_port *port, unsigned char ch)
1280 {
1281 struct uart_sunsu_port *up =
1282 container_of(port, struct uart_sunsu_port, port);
1283
1284 wait_for_xmitr(up);
1285 serial_out(up, UART_TX, ch);
1286 }
1287
1288 /*
1289 * Print a string to the serial port trying not to disturb
1290 * any possible real use of the port...
1291 */
sunsu_console_write(struct console * co,const char * s,unsigned int count)1292 static void sunsu_console_write(struct console *co, const char *s,
1293 unsigned int count)
1294 {
1295 struct uart_sunsu_port *up = &sunsu_ports[co->index];
1296 unsigned long flags;
1297 unsigned int ier;
1298 int locked = 1;
1299
1300 if (up->port.sysrq || oops_in_progress)
1301 locked = spin_trylock_irqsave(&up->port.lock, flags);
1302 else
1303 spin_lock_irqsave(&up->port.lock, flags);
1304
1305 /*
1306 * First save the UER then disable the interrupts
1307 */
1308 ier = serial_in(up, UART_IER);
1309 serial_out(up, UART_IER, 0);
1310
1311 uart_console_write(&up->port, s, count, sunsu_console_putchar);
1312
1313 /*
1314 * Finally, wait for transmitter to become empty
1315 * and restore the IER
1316 */
1317 wait_for_xmitr(up);
1318 serial_out(up, UART_IER, ier);
1319
1320 if (locked)
1321 spin_unlock_irqrestore(&up->port.lock, flags);
1322 }
1323
1324 /*
1325 * Setup initial baud/bits/parity. We do two things here:
1326 * - construct a cflag setting for the first su_open()
1327 * - initialize the serial port
1328 * Return non-zero if we didn't find a serial port.
1329 */
sunsu_console_setup(struct console * co,char * options)1330 static int __init sunsu_console_setup(struct console *co, char *options)
1331 {
1332 static struct ktermios dummy;
1333 struct ktermios termios;
1334 struct uart_port *port;
1335
1336 printk("Console: ttyS%d (SU)\n",
1337 (sunsu_reg.minor - 64) + co->index);
1338
1339 if (co->index > nr_inst)
1340 return -ENODEV;
1341 port = &sunsu_ports[co->index].port;
1342
1343 /*
1344 * Temporary fix.
1345 */
1346 spin_lock_init(&port->lock);
1347
1348 /* Get firmware console settings. */
1349 sunserial_console_termios(co, port->dev->of_node);
1350
1351 memset(&termios, 0, sizeof(struct ktermios));
1352 termios.c_cflag = co->cflag;
1353 port->mctrl |= TIOCM_DTR;
1354 port->ops->set_termios(port, &termios, &dummy);
1355
1356 return 0;
1357 }
1358
1359 static struct console sunsu_console = {
1360 .name = "ttyS",
1361 .write = sunsu_console_write,
1362 .device = uart_console_device,
1363 .setup = sunsu_console_setup,
1364 .flags = CON_PRINTBUFFER,
1365 .index = -1,
1366 .data = &sunsu_reg,
1367 };
1368
1369 /*
1370 * Register console.
1371 */
1372
SUNSU_CONSOLE(void)1373 static inline struct console *SUNSU_CONSOLE(void)
1374 {
1375 return &sunsu_console;
1376 }
1377 #else
1378 #define SUNSU_CONSOLE() (NULL)
1379 #define sunsu_serial_console_init() do { } while (0)
1380 #endif
1381
su_get_type(struct device_node * dp)1382 static enum su_type su_get_type(struct device_node *dp)
1383 {
1384 struct device_node *ap = of_find_node_by_path("/aliases");
1385 enum su_type rc = SU_PORT_PORT;
1386
1387 if (ap) {
1388 const char *keyb = of_get_property(ap, "keyboard", NULL);
1389 const char *ms = of_get_property(ap, "mouse", NULL);
1390 struct device_node *match;
1391
1392 if (keyb) {
1393 match = of_find_node_by_path(keyb);
1394
1395 /*
1396 * The pointer is used as an identifier not
1397 * as a pointer, we can drop the refcount on
1398 * the of__node immediately after getting it.
1399 */
1400 of_node_put(match);
1401
1402 if (dp == match) {
1403 rc = SU_PORT_KBD;
1404 goto out;
1405 }
1406 }
1407 if (ms) {
1408 match = of_find_node_by_path(ms);
1409
1410 of_node_put(match);
1411
1412 if (dp == match) {
1413 rc = SU_PORT_MS;
1414 goto out;
1415 }
1416 }
1417 }
1418
1419 out:
1420 of_node_put(ap);
1421 return rc;
1422 }
1423
su_probe(struct platform_device * op)1424 static int su_probe(struct platform_device *op)
1425 {
1426 struct device_node *dp = op->dev.of_node;
1427 struct uart_sunsu_port *up;
1428 struct resource *rp;
1429 enum su_type type;
1430 bool ignore_line;
1431 int err;
1432
1433 type = su_get_type(dp);
1434 if (type == SU_PORT_PORT) {
1435 if (nr_inst >= UART_NR)
1436 return -EINVAL;
1437 up = &sunsu_ports[nr_inst];
1438 } else {
1439 up = kzalloc(sizeof(*up), GFP_KERNEL);
1440 if (!up)
1441 return -ENOMEM;
1442 }
1443
1444 up->port.line = nr_inst;
1445
1446 spin_lock_init(&up->port.lock);
1447
1448 up->su_type = type;
1449
1450 rp = &op->resource[0];
1451 up->port.mapbase = rp->start;
1452 up->reg_size = resource_size(rp);
1453 up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
1454 if (!up->port.membase) {
1455 if (type != SU_PORT_PORT)
1456 kfree(up);
1457 return -ENOMEM;
1458 }
1459
1460 up->port.irq = op->archdata.irqs[0];
1461
1462 up->port.dev = &op->dev;
1463
1464 up->port.type = PORT_UNKNOWN;
1465 up->port.uartclk = (SU_BASE_BAUD * 16);
1466 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSU_CONSOLE);
1467
1468 err = 0;
1469 if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
1470 err = sunsu_kbd_ms_init(up);
1471 if (err) {
1472 of_iounmap(&op->resource[0],
1473 up->port.membase, up->reg_size);
1474 kfree(up);
1475 return err;
1476 }
1477 platform_set_drvdata(op, up);
1478
1479 nr_inst++;
1480
1481 return 0;
1482 }
1483
1484 up->port.flags |= UPF_BOOT_AUTOCONF;
1485
1486 sunsu_autoconfig(up);
1487
1488 err = -ENODEV;
1489 if (up->port.type == PORT_UNKNOWN)
1490 goto out_unmap;
1491
1492 up->port.ops = &sunsu_pops;
1493
1494 ignore_line = false;
1495 if (of_node_name_eq(dp, "rsc-console") ||
1496 of_node_name_eq(dp, "lom-console"))
1497 ignore_line = true;
1498
1499 sunserial_console_match(SUNSU_CONSOLE(), dp,
1500 &sunsu_reg, up->port.line,
1501 ignore_line);
1502 err = uart_add_one_port(&sunsu_reg, &up->port);
1503 if (err)
1504 goto out_unmap;
1505
1506 platform_set_drvdata(op, up);
1507
1508 nr_inst++;
1509
1510 return 0;
1511
1512 out_unmap:
1513 of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1514 kfree(up);
1515 return err;
1516 }
1517
su_remove(struct platform_device * op)1518 static int su_remove(struct platform_device *op)
1519 {
1520 struct uart_sunsu_port *up = platform_get_drvdata(op);
1521 bool kbdms = false;
1522
1523 if (up->su_type == SU_PORT_MS ||
1524 up->su_type == SU_PORT_KBD)
1525 kbdms = true;
1526
1527 if (kbdms) {
1528 #ifdef CONFIG_SERIO
1529 serio_unregister_port(&up->serio);
1530 #endif
1531 } else if (up->port.type != PORT_UNKNOWN)
1532 uart_remove_one_port(&sunsu_reg, &up->port);
1533
1534 if (up->port.membase)
1535 of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
1536
1537 if (kbdms)
1538 kfree(up);
1539
1540 return 0;
1541 }
1542
1543 static const struct of_device_id su_match[] = {
1544 {
1545 .name = "su",
1546 },
1547 {
1548 .name = "su_pnp",
1549 },
1550 {
1551 .name = "serial",
1552 .compatible = "su",
1553 },
1554 {
1555 .type = "serial",
1556 .compatible = "su",
1557 },
1558 {},
1559 };
1560 MODULE_DEVICE_TABLE(of, su_match);
1561
1562 static struct platform_driver su_driver = {
1563 .driver = {
1564 .name = "su",
1565 .of_match_table = su_match,
1566 },
1567 .probe = su_probe,
1568 .remove = su_remove,
1569 };
1570
sunsu_init(void)1571 static int __init sunsu_init(void)
1572 {
1573 struct device_node *dp;
1574 int err;
1575 int num_uart = 0;
1576
1577 for_each_node_by_name(dp, "su") {
1578 if (su_get_type(dp) == SU_PORT_PORT)
1579 num_uart++;
1580 }
1581 for_each_node_by_name(dp, "su_pnp") {
1582 if (su_get_type(dp) == SU_PORT_PORT)
1583 num_uart++;
1584 }
1585 for_each_node_by_name(dp, "serial") {
1586 if (of_device_is_compatible(dp, "su")) {
1587 if (su_get_type(dp) == SU_PORT_PORT)
1588 num_uart++;
1589 }
1590 }
1591 for_each_node_by_type(dp, "serial") {
1592 if (of_device_is_compatible(dp, "su")) {
1593 if (su_get_type(dp) == SU_PORT_PORT)
1594 num_uart++;
1595 }
1596 }
1597
1598 if (num_uart) {
1599 err = sunserial_register_minors(&sunsu_reg, num_uart);
1600 if (err)
1601 return err;
1602 }
1603
1604 err = platform_driver_register(&su_driver);
1605 if (err && num_uart)
1606 sunserial_unregister_minors(&sunsu_reg, num_uart);
1607
1608 return err;
1609 }
1610
sunsu_exit(void)1611 static void __exit sunsu_exit(void)
1612 {
1613 platform_driver_unregister(&su_driver);
1614 if (sunsu_reg.nr)
1615 sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
1616 }
1617
1618 module_init(sunsu_init);
1619 module_exit(sunsu_exit);
1620
1621 MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
1622 MODULE_DESCRIPTION("Sun SU serial port driver");
1623 MODULE_VERSION("2.0");
1624 MODULE_LICENSE("GPL");
1625
