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