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sdio: add default c_ispeed/c_ospeed values to sdio_uart driver
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / card / sdio_uart.c
CommitLineData
6e418a9d
NP		 1/*
2 * linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver
3 *
4 * Based on drivers/serial/8250.c and drivers/serial/serial_core.c
5 * by Russell King.
6 *
7 * Author: Nicolas Pitre
8 * Created: June 15, 2007
9 * Copyright: MontaVista Software, Inc.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 */
16
17/*
18 * Note: Although this driver assumes a 16550A-like UART implementation,
19 * it is not possible to leverage the common 8250/16550 driver, nor the
20 * core UART infrastructure, as they assumes direct access to the hardware
21 * registers, often under a spinlock. This is not possible in the SDIO
22 * context as SDIO access functions must be able to sleep.
23 *
24 * Because we need to lock the SDIO host to ensure an exclusive access to
25 * the card, we simply rely on that lock to also prevent and serialize
26 * concurrent access to the same port.
27 */
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/kernel.h>
32#include <linux/mutex.h>
33#include <linux/serial_reg.h>
34#include <linux/circ_buf.h>
35#include <linux/gfp.h>
36#include <linux/tty.h>
37#include <linux/tty_flip.h>
38
39#include <linux/mmc/core.h>
40#include <linux/mmc/card.h>
41#include <linux/mmc/sdio_func.h>
42#include <linux/mmc/sdio_ids.h>
43
44
45#define UART_NR 8 /* Number of UARTs this driver can handle */
46
47
48#define UART_XMIT_SIZE PAGE_SIZE
49#define WAKEUP_CHARS 256
50
51#define circ_empty(circ) ((circ)->head == (circ)->tail)
52#define circ_clear(circ) ((circ)->head = (circ)->tail = 0)
53
54#define circ_chars_pending(circ) \
55 (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
56
57#define circ_chars_free(circ) \
58 (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
59
60
61struct uart_icount {
62 __u32 cts;
63 __u32 dsr;
64 __u32 rng;
65 __u32 dcd;
66 __u32 rx;
67 __u32 tx;
68 __u32 frame;
69 __u32 overrun;
70 __u32 parity;
71 __u32 brk;
72};
73
74struct sdio_uart_port {
75 struct kref kref;
76 struct tty_struct *tty;
77 unsigned int index;
78 unsigned int opened;
79 struct mutex open_lock;
80 struct sdio_func *func;
81 struct mutex func_lock;
82 unsigned int regs_offset;
83 struct circ_buf xmit;
84 spinlock_t write_lock;
85 struct uart_icount icount;
86 unsigned int uartclk;
87 unsigned int mctrl;
88 unsigned int read_status_mask;
89 unsigned int ignore_status_mask;
90 unsigned char x_char;
91 unsigned char ier;
92 unsigned char lcr;
93};
94
95static struct sdio_uart_port *sdio_uart_table[UART_NR];
96static DEFINE_SPINLOCK(sdio_uart_table_lock);
97
98static int sdio_uart_add_port(struct sdio_uart_port *port)
99{
100 int index, ret = -EBUSY;
101
102 kref_init(&port->kref);
103 mutex_init(&port->open_lock);
104 mutex_init(&port->func_lock);
105 spin_lock_init(&port->write_lock);
106
107 spin_lock(&sdio_uart_table_lock);
108 for (index = 0; index < UART_NR; index++) {
109 if (!sdio_uart_table[index]) {
110 port->index = index;
111 sdio_uart_table[index] = port;
112 ret = 0;
113 break;
114 }
115 }
116 spin_unlock(&sdio_uart_table_lock);
117
118 return ret;
119}
120
121static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
122{
123 struct sdio_uart_port *port;
124
125 if (index >= UART_NR)
126 return NULL;
127
128 spin_lock(&sdio_uart_table_lock);
129 port = sdio_uart_table[index];
130 if (port)
131 kref_get(&port->kref);
132 spin_unlock(&sdio_uart_table_lock);
133
134 return port;
135}
136
137static void sdio_uart_port_destroy(struct kref *kref)
138{
139 struct sdio_uart_port *port =
140 container_of(kref, struct sdio_uart_port, kref);
141 kfree(port);
142}
143
144static void sdio_uart_port_put(struct sdio_uart_port *port)
145{
146 kref_put(&port->kref, sdio_uart_port_destroy);
147}
148
149static void sdio_uart_port_remove(struct sdio_uart_port *port)
150{
151 struct sdio_func *func;
152
153 BUG_ON(sdio_uart_table[port->index] != port);
154
155 spin_lock(&sdio_uart_table_lock);
156 sdio_uart_table[port->index] = NULL;
157 spin_unlock(&sdio_uart_table_lock);
158
159 /*
160 * We're killing a port that potentially still is in use by
161 * the tty layer. Be careful to prevent any further access
162 * to the SDIO function and arrange for the tty layer to
163 * give up on that port ASAP.
164 * Beware: the lock ordering is critical.
165 */
166 mutex_lock(&port->open_lock);
167 mutex_lock(&port->func_lock);
168 func = port->func;
169 sdio_claim_host(func);
170 port->func = NULL;
171 mutex_unlock(&port->func_lock);
172 if (port->opened)
173 tty_hangup(port->tty);
174 mutex_unlock(&port->open_lock);
175 sdio_release_irq(func);
176 sdio_disable_func(func);
177 sdio_release_host(func);
178
179 sdio_uart_port_put(port);
180}
181
182static int sdio_uart_claim_func(struct sdio_uart_port *port)
183{
184 mutex_lock(&port->func_lock);
185 if (unlikely(!port->func)) {
186 mutex_unlock(&port->func_lock);
187 return -ENODEV;
188 }
189 sdio_claim_host(port->func);
190 mutex_unlock(&port->func_lock);
191 return 0;
192}
193
194static inline void sdio_uart_release_func(struct sdio_uart_port *port)
195{
196 sdio_release_host(port->func);
197}
198
199static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
200{
201 unsigned char c;
202 c = sdio_readb(port->func, port->regs_offset + offset, NULL);
203 return c;
204}
205
206static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
207{
208 sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
209}
210
211static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
212{
213 unsigned char status;
214 unsigned int ret;
215
216 status = sdio_in(port, UART_MSR);
217
218 ret = 0;
219 if (status & UART_MSR_DCD)
220 ret |= TIOCM_CAR;
221 if (status & UART_MSR_RI)
222 ret |= TIOCM_RNG;
223 if (status & UART_MSR_DSR)
224 ret |= TIOCM_DSR;
225 if (status & UART_MSR_CTS)
226 ret |= TIOCM_CTS;
227 return ret;
228}
229
230static void sdio_uart_write_mctrl(struct sdio_uart_port *port, unsigned int mctrl)
231{
232 unsigned char mcr = 0;
233
234 if (mctrl & TIOCM_RTS)
235 mcr |= UART_MCR_RTS;
236 if (mctrl & TIOCM_DTR)
237 mcr |= UART_MCR_DTR;
238 if (mctrl & TIOCM_OUT1)
239 mcr |= UART_MCR_OUT1;
240 if (mctrl & TIOCM_OUT2)
241 mcr |= UART_MCR_OUT2;
242 if (mctrl & TIOCM_LOOP)
243 mcr |= UART_MCR_LOOP;
244
245 sdio_out(port, UART_MCR, mcr);
246}
247
248static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
249 unsigned int set, unsigned int clear)
250{
251 unsigned int old;
252
253 old = port->mctrl;
254 port->mctrl = (old & ~clear) | set;
255 if (old != port->mctrl)
256 sdio_uart_write_mctrl(port, port->mctrl);
257}
258
259#define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
260#define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
261
262static void sdio_uart_change_speed(struct sdio_uart_port *port,
263 struct ktermios *termios,
264 struct ktermios *old)
265{
266 unsigned char cval, fcr = 0;
267 unsigned int baud, quot;
268
269 switch (termios->c_cflag & CSIZE) {
270 case CS5:
271 cval = UART_LCR_WLEN5;
272 break;
273 case CS6:
274 cval = UART_LCR_WLEN6;
275 break;
276 case CS7:
277 cval = UART_LCR_WLEN7;
278 break;
279 default:
280 case CS8:
281 cval = UART_LCR_WLEN8;
282 break;
283 }
284
285 if (termios->c_cflag & CSTOPB)
286 cval |= UART_LCR_STOP;
287 if (termios->c_cflag & PARENB)
288 cval |= UART_LCR_PARITY;
289 if (!(termios->c_cflag & PARODD))
290 cval |= UART_LCR_EPAR;
291
292 for (;;) {
293 baud = tty_termios_baud_rate(termios);
294 if (baud == 0)
295 baud = 9600; /* Special case: B0 rate. */
296 if (baud <= port->uartclk)
297 break;
298 /*
299 * Oops, the quotient was zero. Try again with the old
300 * baud rate if possible, otherwise default to 9600.
301 */
302 termios->c_cflag &= ~CBAUD;
303 if (old) {
304 termios->c_cflag |= old->c_cflag & CBAUD;
305 old = NULL;
306 } else
307 termios->c_cflag |= B9600;
308 }
309 quot = (2 * port->uartclk + baud) / (2 * baud);
310
311 if (baud < 2400)
312 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
313 else
314 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
315
316 port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
317 if (termios->c_iflag & INPCK)
318 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
319 if (termios->c_iflag & (BRKINT | PARMRK))
320 port->read_status_mask |= UART_LSR_BI;
321
322 /*
323 * Characters to ignore
324 */
325 port->ignore_status_mask = 0;
326 if (termios->c_iflag & IGNPAR)
327 port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
328 if (termios->c_iflag & IGNBRK) {
329 port->ignore_status_mask |= UART_LSR_BI;
330 /*
331 * If we're ignoring parity and break indicators,
332 * ignore overruns too (for real raw support).
333 */
334 if (termios->c_iflag & IGNPAR)
335 port->ignore_status_mask |= UART_LSR_OE;
336 }
337
338 /*
339 * ignore all characters if CREAD is not set
340 */
341 if ((termios->c_cflag & CREAD) == 0)
342 port->ignore_status_mask |= UART_LSR_DR;
343
344 /*
345 * CTS flow control flag and modem status interrupts
346 */
347 port->ier &= ~UART_IER_MSI;
348 if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
349 port->ier |= UART_IER_MSI;
350
351 port->lcr = cval;
352
353 sdio_out(port, UART_IER, port->ier);
354 sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
355 sdio_out(port, UART_DLL, quot & 0xff);
356 sdio_out(port, UART_DLM, quot >> 8);
357 sdio_out(port, UART_LCR, cval);
358 sdio_out(port, UART_FCR, fcr);
359
360 sdio_uart_write_mctrl(port, port->mctrl);
361}
362
363static void sdio_uart_start_tx(struct sdio_uart_port *port)
364{
365 if (!(port->ier & UART_IER_THRI)) {
366 port->ier |= UART_IER_THRI;
367 sdio_out(port, UART_IER, port->ier);
368 }
369}
370
371static void sdio_uart_stop_tx(struct sdio_uart_port *port)
372{
373 if (port->ier & UART_IER_THRI) {
374 port->ier &= ~UART_IER_THRI;
375 sdio_out(port, UART_IER, port->ier);
376 }
377}
378
379static void sdio_uart_stop_rx(struct sdio_uart_port *port)
380{
381 port->ier &= ~UART_IER_RLSI;
382 port->read_status_mask &= ~UART_LSR_DR;
383 sdio_out(port, UART_IER, port->ier);
384}
385
386static void sdio_uart_receive_chars(struct sdio_uart_port *port, int *status)
387{
388 struct tty_struct *tty = port->tty;
389 unsigned int ch, flag;
390 int max_count = 256;
391
392 do {
393 ch = sdio_in(port, UART_RX);
394 flag = TTY_NORMAL;
395 port->icount.rx++;
396
397 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
398 UART_LSR_FE | UART_LSR_OE))) {
399 /*
400 * For statistics only
401 */
402 if (*status & UART_LSR_BI) {
403 *status &= ~(UART_LSR_FE | UART_LSR_PE);
404 port->icount.brk++;
405 } else if (*status & UART_LSR_PE)
406 port->icount.parity++;
407 else if (*status & UART_LSR_FE)
408 port->icount.frame++;
409 if (*status & UART_LSR_OE)
410 port->icount.overrun++;
411
412 /*
413 * Mask off conditions which should be ignored.
414 */
415 *status &= port->read_status_mask;
416 if (*status & UART_LSR_BI) {
417 flag = TTY_BREAK;
418 } else if (*status & UART_LSR_PE)
419 flag = TTY_PARITY;
420 else if (*status & UART_LSR_FE)
421 flag = TTY_FRAME;
422 }
423
424 if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
425 tty_insert_flip_char(tty, ch, flag);
426
427 /*
428 * Overrun is special. Since it's reported immediately,
429 * it doesn't affect the current character.
430 */
431 if (*status & ~port->ignore_status_mask & UART_LSR_OE)
432 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
433
434 *status = sdio_in(port, UART_LSR);
435 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
436 tty_flip_buffer_push(tty);
437}
438
439static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
440{
441 struct circ_buf *xmit = &port->xmit;
442 int count;
443
444 if (port->x_char) {
445 sdio_out(port, UART_TX, port->x_char);
446 port->icount.tx++;
447 port->x_char = 0;
448 return;
449 }
450 if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) {
451 sdio_uart_stop_tx(port);
452 return;
453 }
454
455 count = 16;
456 do {
457 sdio_out(port, UART_TX, xmit->buf[xmit->tail]);
458 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
459 port->icount.tx++;
460 if (circ_empty(xmit))
461 break;
462 } while (--count > 0);
463
464 if (circ_chars_pending(xmit) < WAKEUP_CHARS)
465 tty_wakeup(port->tty);
466
467 if (circ_empty(xmit))
468 sdio_uart_stop_tx(port);
469}
470
471static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
472{
473 int status;
474
475 status = sdio_in(port, UART_MSR);
476
477 if ((status & UART_MSR_ANY_DELTA) == 0)
478 return;
479
480 if (status & UART_MSR_TERI)
481 port->icount.rng++;
482 if (status & UART_MSR_DDSR)
483 port->icount.dsr++;
484 if (status & UART_MSR_DDCD)
485 port->icount.dcd++;
486 if (status & UART_MSR_DCTS) {
487 port->icount.cts++;
488 if (port->tty->termios->c_cflag & CRTSCTS) {
489 int cts = (status & UART_MSR_CTS);
490 if (port->tty->hw_stopped) {
491 if (cts) {
492 port->tty->hw_stopped = 0;
493 sdio_uart_start_tx(port);
494 tty_wakeup(port->tty);
495 }
496 } else {
497 if (!cts) {
498 port->tty->hw_stopped = 1;
499 sdio_uart_stop_tx(port);
500 }
501 }
502 }
503 }
504}
505
506/*
507 * This handles the interrupt from one port.
508 */
509static void sdio_uart_irq(struct sdio_func *func)
510{
511 struct sdio_uart_port *port = sdio_get_drvdata(func);
512 unsigned int iir, lsr;
513
514 iir = sdio_in(port, UART_IIR);
515 if (iir & UART_IIR_NO_INT)
516 return;
517 lsr = sdio_in(port, UART_LSR);
518 if (lsr & UART_LSR_DR)
519 sdio_uart_receive_chars(port, &lsr);
520 sdio_uart_check_modem_status(port);
521 if (lsr & UART_LSR_THRE)
522 sdio_uart_transmit_chars(port);
523}
524
525static int sdio_uart_startup(struct sdio_uart_port *port)
526{
527 unsigned long page;
528 int ret;
529
530 /*
531 * Set the TTY IO error marker - we will only clear this
532 * once we have successfully opened the port.
533 */
534 set_bit(TTY_IO_ERROR, &port->tty->flags);
535
536 /* Initialise and allocate the transmit buffer. */
537 page = __get_free_page(GFP_KERNEL);
538 if (!page)
539 return -ENOMEM;
540 port->xmit.buf = (unsigned char *)page;
541 circ_clear(&port->xmit);
542
543 ret = sdio_uart_claim_func(port);
544 if (ret)
545 goto err1;
546 ret = sdio_enable_func(port->func);
547 if (ret)
548 goto err2;
549 ret = sdio_claim_irq(port->func, sdio_uart_irq);
550 if (ret)
551 goto err3;
552
553 /*
554 * Clear the FIFO buffers and disable them.
555 * (they will be reenabled in sdio_change_speed())
556 */
557 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
558 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
559 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
560 sdio_out(port, UART_FCR, 0);
561
562 /*
563 * Clear the interrupt registers.
564 */
565 (void) sdio_in(port, UART_LSR);
566 (void) sdio_in(port, UART_RX);
567 (void) sdio_in(port, UART_IIR);
568 (void) sdio_in(port, UART_MSR);
569
570 /*
571 * Now, initialize the UART
572 */
573 sdio_out(port, UART_LCR, UART_LCR_WLEN8);
574
575 port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
576 port->mctrl = TIOCM_OUT2;
577
578 sdio_uart_change_speed(port, port->tty->termios, NULL);
579
580 if (port->tty->termios->c_cflag & CBAUD)
581 sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
582
583 if (port->tty->termios->c_cflag & CRTSCTS)
584 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
585 port->tty->hw_stopped = 1;
586
587 clear_bit(TTY_IO_ERROR, &port->tty->flags);
588
589 /* Kick the IRQ handler once while we're still holding the host lock */
590 sdio_uart_irq(port->func);
591
592 sdio_uart_release_func(port);
593 return 0;
594
595err3:
596 sdio_disable_func(port->func);
597err2:
598 sdio_uart_release_func(port);
599err1:
600 free_page((unsigned long)port->xmit.buf);
601 return ret;
602}
603
604static void sdio_uart_shutdown(struct sdio_uart_port *port)
605{
606 int ret;
607
608 ret = sdio_uart_claim_func(port);
609 if (ret)
610 goto skip;
611
612 sdio_uart_stop_rx(port);
613
614 /* TODO: wait here for TX FIFO to drain */
615
616 /* Turn off DTR and RTS early. */
617 if (port->tty->termios->c_cflag & HUPCL)
618 sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
619
620 /* Disable interrupts from this port */
621 sdio_release_irq(port->func);
622 port->ier = 0;
623 sdio_out(port, UART_IER, 0);
624
625 sdio_uart_clear_mctrl(port, TIOCM_OUT2);
626
627 /* Disable break condition and FIFOs. */
628 port->lcr &= ~UART_LCR_SBC;
629 sdio_out(port, UART_LCR, port->lcr);
630 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
631 UART_FCR_CLEAR_RCVR |
632 UART_FCR_CLEAR_XMIT);
633 sdio_out(port, UART_FCR, 0);
634
635 sdio_disable_func(port->func);
636
637 sdio_uart_release_func(port);
638
639skip:
640 /* Free the transmit buffer page. */
641 free_page((unsigned long)port->xmit.buf);
642}
643
644static int sdio_uart_open (struct tty_struct *tty, struct file * filp)
645{
646 struct sdio_uart_port *port;
647 int ret;
648
649 port = sdio_uart_port_get(tty->index);
650 if (!port)
651 return -ENODEV;
652
653 mutex_lock(&port->open_lock);
654
655 /*
656 * Make sure not to mess up with a dead port
657 * which has not been closed yet.
658 */
659 if (tty->driver_data && tty->driver_data != port) {
660 mutex_unlock(&port->open_lock);
661 sdio_uart_port_put(port);
662 return -EBUSY;
663 }
664
665 if (!port->opened) {
666 tty->driver_data = port;
667 port->tty = tty;
668 ret = sdio_uart_startup(port);
669 if (ret) {
670 tty->driver_data = NULL;
671 port->tty = NULL;
672 mutex_unlock(&port->open_lock);
673 sdio_uart_port_put(port);
674 return ret;
675 }
676 }
677 port->opened++;
678 mutex_unlock(&port->open_lock);
679 return 0;
680}
681
682static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
683{
684 struct sdio_uart_port *port = tty->driver_data;
685
686 if (!port)
687 return;
688
689 mutex_lock(&port->open_lock);
690 BUG_ON(!port->opened);
691
692 /*
693 * This is messy. The tty layer calls us even when open()
694 * returned an error. Ignore this close request if tty->count
695 * is larger than port->count.
696 */
697 if (tty->count > port->opened) {
698 mutex_unlock(&port->open_lock);
699 return;
700 }
701
702 if (--port->opened == 0) {
703 tty->closing = 1;
704 sdio_uart_shutdown(port);
705 tty_ldisc_flush(tty);
706 port->tty = NULL;
707 tty->driver_data = NULL;
708 tty->closing = 0;
709 }
710 mutex_unlock(&port->open_lock);
711 sdio_uart_port_put(port);
712}
713
714static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf,
715 int count)
716{
717 struct sdio_uart_port *port = tty->driver_data;
718 struct circ_buf *circ = &port->xmit;
719 int c, ret = 0;
720
721 if (!port->func)
722 return -ENODEV;
723
724 spin_lock(&port->write_lock);
725 while (1) {
726 c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
727 if (count < c)
728 c = count;
729 if (c <= 0)
730 break;
731 memcpy(circ->buf + circ->head, buf, c);
732 circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
733 buf += c;
734 count -= c;
735 ret += c;
736 }
737 spin_unlock(&port->write_lock);
738
739 if ( !(port->ier & UART_IER_THRI)) {
740 int err = sdio_uart_claim_func(port);
741 if (!err) {
742 sdio_uart_start_tx(port);
743 sdio_uart_irq(port->func);
744 sdio_uart_release_func(port);
745 } else
746 ret = err;
747 }
748
749 return ret;
750}
751
752static int sdio_uart_write_room(struct tty_struct *tty)
753{
754 struct sdio_uart_port *port = tty->driver_data;
755 return port ? circ_chars_free(&port->xmit) : 0;
756}
757
758static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
759{
760 struct sdio_uart_port *port = tty->driver_data;
761 return port ? circ_chars_pending(&port->xmit) : 0;
762}
763
764static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
765{
766 struct sdio_uart_port *port = tty->driver_data;
767
768 port->x_char = ch;
769 if (ch && !(port->ier & UART_IER_THRI)) {
770 if (sdio_uart_claim_func(port) != 0)
771 return;
772 sdio_uart_start_tx(port);
773 sdio_uart_irq(port->func);
774 sdio_uart_release_func(port);
775 }
776}
777
778static void sdio_uart_throttle(struct tty_struct *tty)
779{
780 struct sdio_uart_port *port = tty->driver_data;
781
782 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
783 return;
784
785 if (sdio_uart_claim_func(port) != 0)
786 return;
787
788 if (I_IXOFF(tty)) {
789 port->x_char = STOP_CHAR(tty);
790 sdio_uart_start_tx(port);
791 }
792
793 if (tty->termios->c_cflag & CRTSCTS)
794 sdio_uart_clear_mctrl(port, TIOCM_RTS);
795
796 sdio_uart_irq(port->func);
797 sdio_uart_release_func(port);
798}
799
800static void sdio_uart_unthrottle(struct tty_struct *tty)
801{
802 struct sdio_uart_port *port = tty->driver_data;
803
804 if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
805 return;
806
807 if (sdio_uart_claim_func(port) != 0)
808 return;
809
810 if (I_IXOFF(tty)) {
811 if (port->x_char) {
812 port->x_char = 0;
813 } else {
814 port->x_char = START_CHAR(tty);
815 sdio_uart_start_tx(port);
816 }
817 }
818
819 if (tty->termios->c_cflag & CRTSCTS)
820 sdio_uart_set_mctrl(port, TIOCM_RTS);
821
822 sdio_uart_irq(port->func);
823 sdio_uart_release_func(port);
824}
825
826static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
827{
828 struct sdio_uart_port *port = tty->driver_data;
829 unsigned int cflag = tty->termios->c_cflag;
830
831#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
832
833 if ((cflag ^ old_termios->c_cflag) == 0 &&
834 RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
835 return;
836
837 if (sdio_uart_claim_func(port) != 0)
838 return;
839
840 sdio_uart_change_speed(port, tty->termios, old_termios);
841
842 /* Handle transition to B0 status */
843 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
844 sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
845
846 /* Handle transition away from B0 status */
847 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
848 unsigned int mask = TIOCM_DTR;
849 if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
850 mask |= TIOCM_RTS;
851 sdio_uart_set_mctrl(port, mask);
852 }
853
854 /* Handle turning off CRTSCTS */
855 if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
856 tty->hw_stopped = 0;
857 sdio_uart_start_tx(port);
858 }
859
860 /* Handle turning on CRTSCTS */
861 if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
862 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
863 tty->hw_stopped = 1;
864 sdio_uart_stop_tx(port);
865 }
866 }
867
868 sdio_uart_release_func(port);
869}
870
871static void sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
872{
873 struct sdio_uart_port *port = tty->driver_data;
874
875 if (sdio_uart_claim_func(port) != 0)
876 return;
877
878 if (break_state == -1)
879 port->lcr |= UART_LCR_SBC;
880 else
881 port->lcr &= ~UART_LCR_SBC;
882 sdio_out(port, UART_LCR, port->lcr);
883
884 sdio_uart_release_func(port);
885}
886
887static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
888{
889 struct sdio_uart_port *port = tty->driver_data;
890 int result;
891
892 result = sdio_uart_claim_func(port);
893 if (!result) {
894 result = port->mctrl | sdio_uart_get_mctrl(port);
895 sdio_uart_release_func(port);
896 }
897
898 return result;
899}
900
901static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
902 unsigned int set, unsigned int clear)
903{
904 struct sdio_uart_port *port = tty->driver_data;
905 int result;
906
907 result =sdio_uart_claim_func(port);
908 if(!result) {
909 sdio_uart_update_mctrl(port, set, clear);
910 sdio_uart_release_func(port);
911 }
912
913 return result;
914}
915
5ed334a1
NP		 916static int sdio_uart_read_proc(char *page, char **start, off_t off,
917 int count, int *eof, void *data)
918{
919 int i, len = 0;
920 off_t begin = 0;
921
922 len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
923 "", "", "");
924 for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
925 struct sdio_uart_port *port = sdio_uart_port_get(i);
926 if (port) {
927 len += sprintf(page+len, "%d: uart:SDIO", i);
928 if(capable(CAP_SYS_ADMIN)) {
929 len += sprintf(page + len, " tx:%d rx:%d",
930 port->icount.tx, port->icount.rx);
931 if (port->icount.frame)
932 len += sprintf(page + len, " fe:%d",
933 port->icount.frame);
934 if (port->icount.parity)
935 len += sprintf(page + len, " pe:%d",
936 port->icount.parity);
937 if (port->icount.brk)
938 len += sprintf(page + len, " brk:%d",
939 port->icount.brk);
940 if (port->icount.overrun)
941 len += sprintf(page + len, " oe:%d",
942 port->icount.overrun);
943 if (port->icount.cts)
944 len += sprintf(page + len, " cts:%d",
945 port->icount.cts);
946 if (port->icount.dsr)
947 len += sprintf(page + len, " dsr:%d",
948 port->icount.dsr);
949 if (port->icount.rng)
950 len += sprintf(page + len, " rng:%d",
951 port->icount.rng);
952 if (port->icount.dcd)
953 len += sprintf(page + len, " dcd:%d",
954 port->icount.dcd);
955 }
956 strcat(page, "\n");
957 len++;
958 sdio_uart_port_put(port);
959 }
960
961 if (len + begin > off + count)
962 goto done;
963 if (len + begin < off) {
964 begin += len;
965 len = 0;
966 }
967 }
968 *eof = 1;
969
970done:
971 if (off >= len + begin)
972 return 0;
973 *start = page + (off - begin);
974 return (count < begin + len - off) ? count : (begin + len - off);
975}
976
6e418a9d
NP		 977static const struct tty_operations sdio_uart_ops = {
978 .open = sdio_uart_open,
979 .close = sdio_uart_close,
980 .write = sdio_uart_write,
981 .write_room = sdio_uart_write_room,
982 .chars_in_buffer = sdio_uart_chars_in_buffer,
983 .send_xchar = sdio_uart_send_xchar,
984 .throttle = sdio_uart_throttle,
985 .unthrottle = sdio_uart_unthrottle,
986 .set_termios = sdio_uart_set_termios,
987 .break_ctl = sdio_uart_break_ctl,
988 .tiocmget = sdio_uart_tiocmget,
989 .tiocmset = sdio_uart_tiocmset,
5ed334a1 990 .read_proc = sdio_uart_read_proc,
6e418a9d
NP		 991};
992
993static struct tty_driver *sdio_uart_tty_driver;
994
995static int sdio_uart_probe(struct sdio_func *func,
996 const struct sdio_device_id *id)
997{
998 struct sdio_uart_port *port;
999 int ret;
1000
1001 port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
1002 if (!port)
1003 return -ENOMEM;
1004
1005 if (func->class == SDIO_CLASS_UART) {
1006 printk(KERN_WARNING "%s: need info on UART class basic setup\n",
1007 sdio_func_id(func));
1008 kfree(port);
1009 return -ENOSYS;
1010 } else if (func->class == SDIO_CLASS_GPS) {
1011 /*
1012 * We need tuple 0x91. It contains SUBTPL_SIOREG
1013 * and SUBTPL_RCVCAPS.
1014 */
1015 struct sdio_func_tuple *tpl;
1016 for (tpl = func->tuples; tpl; tpl = tpl->next) {
1017 if (tpl->code != 0x91)
1018 continue;
1019 if (tpl->size < 10)
1020 continue;
1021 if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
1022 break;
1023 }
1024 if (!tpl) {
1025 printk(KERN_WARNING
1026 "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
1027 sdio_func_id(func));
1028 kfree(port);
1029 return -EINVAL;
1030 }
1031 printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
1032 sdio_func_id(func), tpl->data[2], tpl->data[3]);
1033 port->regs_offset = (tpl->data[4] << 0) |
1034 (tpl->data[5] << 8) |
1035 (tpl->data[6] << 16);
1036 printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
1037 sdio_func_id(func), port->regs_offset);
1038 port->uartclk = tpl->data[7] * 115200;
1039 if (port->uartclk == 0)
1040 port->uartclk = 115200;
1041 printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
1042 sdio_func_id(func), port->uartclk,
1043 tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
1044 } else {
1045 kfree(port);
1046 return -EINVAL;
1047 }
1048
1049 port->func = func;
1050 sdio_set_drvdata(func, port);
1051
1052 ret = sdio_uart_add_port(port);
1053 if (ret) {
1054 kfree(port);
1055 } else {
1056 struct device *dev;
1057 dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev);
1058 if (IS_ERR(dev)) {
1059 sdio_uart_port_remove(port);
1060 ret = PTR_ERR(dev);
1061 }
1062 }
1063
1064 return ret;
1065}
1066
1067static void sdio_uart_remove(struct sdio_func *func)
1068{
1069 struct sdio_uart_port *port = sdio_get_drvdata(func);
1070
1071 tty_unregister_device(sdio_uart_tty_driver, port->index);
1072 sdio_uart_port_remove(port);
1073}
1074
1075static const struct sdio_device_id sdio_uart_ids[] = {
1076 { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
1077 { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
1078 { /* end: all zeroes */ },
1079};
1080
1081MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
1082
1083static struct sdio_driver sdio_uart_driver = {
1084 .probe = sdio_uart_probe,
1085 .remove = sdio_uart_remove,
1086 .name = "sdio_uart",
1087 .id_table = sdio_uart_ids,
1088};
1089
1090static int __init sdio_uart_init(void)
1091{
1092 int ret;
1093 struct tty_driver *tty_drv;
1094
1095 sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
1096 if (!tty_drv)
1097 return -ENOMEM;
1098
1099 tty_drv->owner = THIS_MODULE;
1100 tty_drv->driver_name = "sdio_uart";
1101 tty_drv->name = "ttySDIO";
1102 tty_drv->major = 0; /* dynamically allocated */
1103 tty_drv->minor_start = 0;
1104 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1105 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1106 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1107 tty_drv->init_termios = tty_std_termios;
1108 tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
2ba30eed
NP		 1109 tty_drv->init_termios.c_ispeed = 4800;
1110 tty_drv->init_termios.c_ospeed = 4800;
6e418a9d
NP		 1111 tty_set_operations(tty_drv, &sdio_uart_ops);
1112
1113 ret = tty_register_driver(tty_drv);
1114 if (ret)
1115 goto err1;
1116
1117 ret = sdio_register_driver(&sdio_uart_driver);
1118 if (ret)
1119 goto err2;
1120
1121 return 0;
1122
1123err2:
1124 tty_unregister_driver(tty_drv);
1125err1:
1126 put_tty_driver(tty_drv);
1127 return ret;
1128}
1129
1130static void __exit sdio_uart_exit(void)
1131{
1132 sdio_unregister_driver(&sdio_uart_driver);
1133 tty_unregister_driver(sdio_uart_tty_driver);
1134 put_tty_driver(sdio_uart_tty_driver);
1135}
1136
1137module_init(sdio_uart_init);
1138module_exit(sdio_uart_exit);
1139
1140MODULE_AUTHOR("Nicolas Pitre");
1141MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)