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Nicolas Pitre6e418a92007-06-30 02:04:21 -04001/*
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>
Alan Cox4b3b49b2009-11-30 13:16:36 +000032#include <linux/sched.h>
Nicolas Pitre6e418a92007-06-30 02:04:21 -040033#include <linux/mutex.h>
Alexey Dobriyan201a50b2009-03-31 15:19:20 -070034#include <linux/seq_file.h>
Nicolas Pitre6e418a92007-06-30 02:04:21 -040035#include <linux/serial_reg.h>
36#include <linux/circ_buf.h>
Nicolas Pitre6e418a92007-06-30 02:04:21 -040037#include <linux/tty.h>
38#include <linux/tty_flip.h>
Alan Cox8b197a52010-02-08 10:08:39 +000039#include <linux/kfifo.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Nicolas Pitre6e418a92007-06-30 02:04:21 -040041
42#include <linux/mmc/core.h>
43#include <linux/mmc/card.h>
44#include <linux/mmc/sdio_func.h>
45#include <linux/mmc/sdio_ids.h>
46
47
48#define UART_NR 8 /* Number of UARTs this driver can handle */
49
50
Alan Cox8b197a52010-02-08 10:08:39 +000051#define FIFO_SIZE PAGE_SIZE
Nicolas Pitre6e418a92007-06-30 02:04:21 -040052#define WAKEUP_CHARS 256
53
Nicolas Pitre6e418a92007-06-30 02:04:21 -040054struct uart_icount {
55 __u32 cts;
56 __u32 dsr;
57 __u32 rng;
58 __u32 dcd;
59 __u32 rx;
60 __u32 tx;
61 __u32 frame;
62 __u32 overrun;
63 __u32 parity;
64 __u32 brk;
65};
66
67struct sdio_uart_port {
Alan Coxb5849b12009-11-05 13:28:06 +000068 struct tty_port port;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040069 unsigned int index;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040070 struct sdio_func *func;
71 struct mutex func_lock;
Nicolas Pitre15b82b42007-08-20 17:17:37 -040072 struct task_struct *in_sdio_uart_irq;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040073 unsigned int regs_offset;
Alan Cox8b197a52010-02-08 10:08:39 +000074 struct kfifo xmit_fifo;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040075 spinlock_t write_lock;
76 struct uart_icount icount;
77 unsigned int uartclk;
78 unsigned int mctrl;
Alan Cox4b3b49b2009-11-30 13:16:36 +000079 unsigned int rx_mctrl;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040080 unsigned int read_status_mask;
81 unsigned int ignore_status_mask;
82 unsigned char x_char;
83 unsigned char ier;
84 unsigned char lcr;
85};
86
87static struct sdio_uart_port *sdio_uart_table[UART_NR];
88static DEFINE_SPINLOCK(sdio_uart_table_lock);
89
90static int sdio_uart_add_port(struct sdio_uart_port *port)
91{
92 int index, ret = -EBUSY;
93
Nicolas Pitre6e418a92007-06-30 02:04:21 -040094 mutex_init(&port->func_lock);
95 spin_lock_init(&port->write_lock);
Alan Cox8b197a52010-02-08 10:08:39 +000096 if (kfifo_alloc(&port->xmit_fifo, FIFO_SIZE, GFP_KERNEL))
97 return -ENOMEM;
Nicolas Pitre6e418a92007-06-30 02:04:21 -040098
99 spin_lock(&sdio_uart_table_lock);
100 for (index = 0; index < UART_NR; index++) {
101 if (!sdio_uart_table[index]) {
102 port->index = index;
103 sdio_uart_table[index] = port;
104 ret = 0;
105 break;
106 }
107 }
108 spin_unlock(&sdio_uart_table_lock);
109
110 return ret;
111}
112
113static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
114{
115 struct sdio_uart_port *port;
116
117 if (index >= UART_NR)
118 return NULL;
119
120 spin_lock(&sdio_uart_table_lock);
121 port = sdio_uart_table[index];
122 if (port)
Jiri Slabye70c6772012-11-15 09:49:52 +0100123 tty_port_get(&port->port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400124 spin_unlock(&sdio_uart_table_lock);
125
126 return port;
127}
128
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400129static void sdio_uart_port_put(struct sdio_uart_port *port)
130{
Jiri Slabye70c6772012-11-15 09:49:52 +0100131 tty_port_put(&port->port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400132}
133
134static void sdio_uart_port_remove(struct sdio_uart_port *port)
135{
136 struct sdio_func *func;
Alan Cox584abc32009-11-30 13:16:09 +0000137 struct tty_struct *tty;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400138
139 BUG_ON(sdio_uart_table[port->index] != port);
140
141 spin_lock(&sdio_uart_table_lock);
142 sdio_uart_table[port->index] = NULL;
143 spin_unlock(&sdio_uart_table_lock);
144
145 /*
146 * We're killing a port that potentially still is in use by
147 * the tty layer. Be careful to prevent any further access
148 * to the SDIO function and arrange for the tty layer to
149 * give up on that port ASAP.
150 * Beware: the lock ordering is critical.
151 */
Alan Cox0a68f642009-11-05 13:28:38 +0000152 mutex_lock(&port->port.mutex);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400153 mutex_lock(&port->func_lock);
154 func = port->func;
155 sdio_claim_host(func);
156 port->func = NULL;
157 mutex_unlock(&port->func_lock);
Alan Cox584abc32009-11-30 13:16:09 +0000158 tty = tty_port_tty_get(&port->port);
159 /* tty_hangup is async so is this safe as is ?? */
160 if (tty) {
161 tty_hangup(tty);
Alan Cox530646f2009-11-05 13:28:29 +0000162 tty_kref_put(tty);
163 }
Alan Cox0a68f642009-11-05 13:28:38 +0000164 mutex_unlock(&port->port.mutex);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400165 sdio_release_irq(func);
166 sdio_disable_func(func);
167 sdio_release_host(func);
168
169 sdio_uart_port_put(port);
170}
171
172static int sdio_uart_claim_func(struct sdio_uart_port *port)
173{
174 mutex_lock(&port->func_lock);
175 if (unlikely(!port->func)) {
176 mutex_unlock(&port->func_lock);
177 return -ENODEV;
178 }
Nicolas Pitre15b82b42007-08-20 17:17:37 -0400179 if (likely(port->in_sdio_uart_irq != current))
180 sdio_claim_host(port->func);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400181 mutex_unlock(&port->func_lock);
182 return 0;
183}
184
185static inline void sdio_uart_release_func(struct sdio_uart_port *port)
186{
Nicolas Pitre15b82b42007-08-20 17:17:37 -0400187 if (likely(port->in_sdio_uart_irq != current))
188 sdio_release_host(port->func);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400189}
190
191static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
192{
193 unsigned char c;
194 c = sdio_readb(port->func, port->regs_offset + offset, NULL);
195 return c;
196}
197
198static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
199{
200 sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
201}
202
203static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
204{
205 unsigned char status;
206 unsigned int ret;
207
Alan Cox4b3b49b2009-11-30 13:16:36 +0000208 /* FIXME: What stops this losing the delta bits and breaking
209 sdio_uart_check_modem_status ? */
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400210 status = sdio_in(port, UART_MSR);
211
212 ret = 0;
213 if (status & UART_MSR_DCD)
214 ret |= TIOCM_CAR;
215 if (status & UART_MSR_RI)
216 ret |= TIOCM_RNG;
217 if (status & UART_MSR_DSR)
218 ret |= TIOCM_DSR;
219 if (status & UART_MSR_CTS)
220 ret |= TIOCM_CTS;
221 return ret;
222}
223
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300224static void sdio_uart_write_mctrl(struct sdio_uart_port *port,
225 unsigned int mctrl)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400226{
227 unsigned char mcr = 0;
228
229 if (mctrl & TIOCM_RTS)
230 mcr |= UART_MCR_RTS;
231 if (mctrl & TIOCM_DTR)
232 mcr |= UART_MCR_DTR;
233 if (mctrl & TIOCM_OUT1)
234 mcr |= UART_MCR_OUT1;
235 if (mctrl & TIOCM_OUT2)
236 mcr |= UART_MCR_OUT2;
237 if (mctrl & TIOCM_LOOP)
238 mcr |= UART_MCR_LOOP;
239
240 sdio_out(port, UART_MCR, mcr);
241}
242
243static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
244 unsigned int set, unsigned int clear)
245{
246 unsigned int old;
247
248 old = port->mctrl;
249 port->mctrl = (old & ~clear) | set;
250 if (old != port->mctrl)
251 sdio_uart_write_mctrl(port, port->mctrl);
252}
253
254#define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
255#define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
256
257static void sdio_uart_change_speed(struct sdio_uart_port *port,
258 struct ktermios *termios,
259 struct ktermios *old)
260{
261 unsigned char cval, fcr = 0;
262 unsigned int baud, quot;
263
264 switch (termios->c_cflag & CSIZE) {
265 case CS5:
266 cval = UART_LCR_WLEN5;
267 break;
268 case CS6:
269 cval = UART_LCR_WLEN6;
270 break;
271 case CS7:
272 cval = UART_LCR_WLEN7;
273 break;
274 default:
275 case CS8:
276 cval = UART_LCR_WLEN8;
277 break;
278 }
279
280 if (termios->c_cflag & CSTOPB)
281 cval |= UART_LCR_STOP;
282 if (termios->c_cflag & PARENB)
283 cval |= UART_LCR_PARITY;
284 if (!(termios->c_cflag & PARODD))
285 cval |= UART_LCR_EPAR;
286
287 for (;;) {
288 baud = tty_termios_baud_rate(termios);
289 if (baud == 0)
290 baud = 9600; /* Special case: B0 rate. */
291 if (baud <= port->uartclk)
292 break;
293 /*
294 * Oops, the quotient was zero. Try again with the old
295 * baud rate if possible, otherwise default to 9600.
296 */
297 termios->c_cflag &= ~CBAUD;
298 if (old) {
299 termios->c_cflag |= old->c_cflag & CBAUD;
300 old = NULL;
301 } else
302 termios->c_cflag |= B9600;
303 }
304 quot = (2 * port->uartclk + baud) / (2 * baud);
305
306 if (baud < 2400)
307 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
308 else
309 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
310
311 port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
312 if (termios->c_iflag & INPCK)
313 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
314 if (termios->c_iflag & (BRKINT | PARMRK))
315 port->read_status_mask |= UART_LSR_BI;
316
317 /*
318 * Characters to ignore
319 */
320 port->ignore_status_mask = 0;
321 if (termios->c_iflag & IGNPAR)
322 port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
323 if (termios->c_iflag & IGNBRK) {
324 port->ignore_status_mask |= UART_LSR_BI;
325 /*
326 * If we're ignoring parity and break indicators,
327 * ignore overruns too (for real raw support).
328 */
329 if (termios->c_iflag & IGNPAR)
330 port->ignore_status_mask |= UART_LSR_OE;
331 }
332
333 /*
334 * ignore all characters if CREAD is not set
335 */
336 if ((termios->c_cflag & CREAD) == 0)
337 port->ignore_status_mask |= UART_LSR_DR;
338
339 /*
340 * CTS flow control flag and modem status interrupts
341 */
342 port->ier &= ~UART_IER_MSI;
343 if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
344 port->ier |= UART_IER_MSI;
345
346 port->lcr = cval;
347
348 sdio_out(port, UART_IER, port->ier);
349 sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
350 sdio_out(port, UART_DLL, quot & 0xff);
351 sdio_out(port, UART_DLM, quot >> 8);
352 sdio_out(port, UART_LCR, cval);
353 sdio_out(port, UART_FCR, fcr);
354
355 sdio_uart_write_mctrl(port, port->mctrl);
356}
357
358static void sdio_uart_start_tx(struct sdio_uart_port *port)
359{
360 if (!(port->ier & UART_IER_THRI)) {
361 port->ier |= UART_IER_THRI;
362 sdio_out(port, UART_IER, port->ier);
363 }
364}
365
366static void sdio_uart_stop_tx(struct sdio_uart_port *port)
367{
368 if (port->ier & UART_IER_THRI) {
369 port->ier &= ~UART_IER_THRI;
370 sdio_out(port, UART_IER, port->ier);
371 }
372}
373
374static void sdio_uart_stop_rx(struct sdio_uart_port *port)
375{
376 port->ier &= ~UART_IER_RLSI;
377 port->read_status_mask &= ~UART_LSR_DR;
378 sdio_out(port, UART_IER, port->ier);
379}
380
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300381static void sdio_uart_receive_chars(struct sdio_uart_port *port,
382 unsigned int *status)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400383{
Alan Cox530646f2009-11-05 13:28:29 +0000384 struct tty_struct *tty = tty_port_tty_get(&port->port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400385 unsigned int ch, flag;
386 int max_count = 256;
387
388 do {
389 ch = sdio_in(port, UART_RX);
390 flag = TTY_NORMAL;
391 port->icount.rx++;
392
393 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300394 UART_LSR_FE | UART_LSR_OE))) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400395 /*
396 * For statistics only
397 */
398 if (*status & UART_LSR_BI) {
399 *status &= ~(UART_LSR_FE | UART_LSR_PE);
400 port->icount.brk++;
401 } else if (*status & UART_LSR_PE)
402 port->icount.parity++;
403 else if (*status & UART_LSR_FE)
404 port->icount.frame++;
405 if (*status & UART_LSR_OE)
406 port->icount.overrun++;
407
408 /*
409 * Mask off conditions which should be ignored.
410 */
411 *status &= port->read_status_mask;
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300412 if (*status & UART_LSR_BI)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400413 flag = TTY_BREAK;
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300414 else if (*status & UART_LSR_PE)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400415 flag = TTY_PARITY;
416 else if (*status & UART_LSR_FE)
417 flag = TTY_FRAME;
418 }
419
420 if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
Alan Cox530646f2009-11-05 13:28:29 +0000421 if (tty)
422 tty_insert_flip_char(tty, ch, flag);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400423
424 /*
425 * Overrun is special. Since it's reported immediately,
426 * it doesn't affect the current character.
427 */
428 if (*status & ~port->ignore_status_mask & UART_LSR_OE)
Alan Cox530646f2009-11-05 13:28:29 +0000429 if (tty)
430 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400431
432 *status = sdio_in(port, UART_LSR);
433 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
Alan Cox530646f2009-11-05 13:28:29 +0000434 if (tty) {
435 tty_flip_buffer_push(tty);
436 tty_kref_put(tty);
437 }
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400438}
439
440static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
441{
Alan Cox8b197a52010-02-08 10:08:39 +0000442 struct kfifo *xmit = &port->xmit_fifo;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400443 int count;
Alan Cox530646f2009-11-05 13:28:29 +0000444 struct tty_struct *tty;
Alan Cox8b197a52010-02-08 10:08:39 +0000445 u8 iobuf[16];
446 int len;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400447
448 if (port->x_char) {
449 sdio_out(port, UART_TX, port->x_char);
450 port->icount.tx++;
451 port->x_char = 0;
452 return;
453 }
Alan Cox530646f2009-11-05 13:28:29 +0000454
455 tty = tty_port_tty_get(&port->port);
456
Alan Cox8b197a52010-02-08 10:08:39 +0000457 if (tty == NULL || !kfifo_len(xmit) ||
Alan Coxc271cf32009-11-30 13:16:25 +0000458 tty->stopped || tty->hw_stopped) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400459 sdio_uart_stop_tx(port);
Alan Cox530646f2009-11-05 13:28:29 +0000460 tty_kref_put(tty);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400461 return;
462 }
463
Alan Cox8b197a52010-02-08 10:08:39 +0000464 len = kfifo_out_locked(xmit, iobuf, 16, &port->write_lock);
465 for (count = 0; count < len; count++) {
466 sdio_out(port, UART_TX, iobuf[count]);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400467 port->icount.tx++;
Alan Cox8b197a52010-02-08 10:08:39 +0000468 }
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400469
Alan Cox8b197a52010-02-08 10:08:39 +0000470 len = kfifo_len(xmit);
471 if (len < WAKEUP_CHARS) {
Alan Coxb5849b12009-11-05 13:28:06 +0000472 tty_wakeup(tty);
Alan Cox8b197a52010-02-08 10:08:39 +0000473 if (len == 0)
474 sdio_uart_stop_tx(port);
475 }
Alan Cox530646f2009-11-05 13:28:29 +0000476 tty_kref_put(tty);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400477}
478
479static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
480{
481 int status;
Alan Cox530646f2009-11-05 13:28:29 +0000482 struct tty_struct *tty;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400483
484 status = sdio_in(port, UART_MSR);
485
486 if ((status & UART_MSR_ANY_DELTA) == 0)
487 return;
488
489 if (status & UART_MSR_TERI)
490 port->icount.rng++;
491 if (status & UART_MSR_DDSR)
492 port->icount.dsr++;
Alan Cox4b3b49b2009-11-30 13:16:36 +0000493 if (status & UART_MSR_DDCD) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400494 port->icount.dcd++;
Alan Cox4b3b49b2009-11-30 13:16:36 +0000495 /* DCD raise - wake for open */
496 if (status & UART_MSR_DCD)
497 wake_up_interruptible(&port->port.open_wait);
498 else {
499 /* DCD drop - hang up if tty attached */
500 tty = tty_port_tty_get(&port->port);
501 if (tty) {
502 tty_hangup(tty);
503 tty_kref_put(tty);
504 }
505 }
506 }
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400507 if (status & UART_MSR_DCTS) {
508 port->icount.cts++;
Alan Cox530646f2009-11-05 13:28:29 +0000509 tty = tty_port_tty_get(&port->port);
Alan Coxadc8d742012-07-14 15:31:47 +0100510 if (tty && (tty->termios.c_cflag & CRTSCTS)) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400511 int cts = (status & UART_MSR_CTS);
Alan Coxb5849b12009-11-05 13:28:06 +0000512 if (tty->hw_stopped) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400513 if (cts) {
Alan Coxb5849b12009-11-05 13:28:06 +0000514 tty->hw_stopped = 0;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400515 sdio_uart_start_tx(port);
Alan Coxb5849b12009-11-05 13:28:06 +0000516 tty_wakeup(tty);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400517 }
518 } else {
519 if (!cts) {
Alan Coxb5849b12009-11-05 13:28:06 +0000520 tty->hw_stopped = 1;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400521 sdio_uart_stop_tx(port);
522 }
523 }
524 }
Alan Cox530646f2009-11-05 13:28:29 +0000525 tty_kref_put(tty);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400526 }
527}
528
529/*
530 * This handles the interrupt from one port.
531 */
532static void sdio_uart_irq(struct sdio_func *func)
533{
534 struct sdio_uart_port *port = sdio_get_drvdata(func);
535 unsigned int iir, lsr;
536
Nicolas Pitre15b82b42007-08-20 17:17:37 -0400537 /*
538 * In a few places sdio_uart_irq() is called directly instead of
539 * waiting for the actual interrupt to be raised and the SDIO IRQ
540 * thread scheduled in order to reduce latency. However, some
541 * interaction with the tty core may end up calling us back
542 * (serial echo, flow control, etc.) through those same places
543 * causing undesirable effects. Let's stop the recursion here.
544 */
545 if (unlikely(port->in_sdio_uart_irq == current))
546 return;
547
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400548 iir = sdio_in(port, UART_IIR);
549 if (iir & UART_IIR_NO_INT)
550 return;
Nicolas Pitre15b82b42007-08-20 17:17:37 -0400551
552 port->in_sdio_uart_irq = current;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400553 lsr = sdio_in(port, UART_LSR);
554 if (lsr & UART_LSR_DR)
555 sdio_uart_receive_chars(port, &lsr);
556 sdio_uart_check_modem_status(port);
557 if (lsr & UART_LSR_THRE)
558 sdio_uart_transmit_chars(port);
Nicolas Pitre15b82b42007-08-20 17:17:37 -0400559 port->in_sdio_uart_irq = NULL;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400560}
561
Alan Cox4b3b49b2009-11-30 13:16:36 +0000562static int uart_carrier_raised(struct tty_port *tport)
563{
564 struct sdio_uart_port *port =
565 container_of(tport, struct sdio_uart_port, port);
566 unsigned int ret = sdio_uart_claim_func(port);
Adam Buchbinderc9404c92009-12-18 15:40:42 -0500567 if (ret) /* Missing hardware shouldn't block for carrier */
Alan Cox4b3b49b2009-11-30 13:16:36 +0000568 return 1;
569 ret = sdio_uart_get_mctrl(port);
570 sdio_uart_release_func(port);
571 if (ret & TIOCM_CAR)
572 return 1;
573 return 0;
574}
575
Alan Cox584abc32009-11-30 13:16:09 +0000576/**
577 * uart_dtr_rts - port helper to set uart signals
578 * @tport: tty port to be updated
579 * @onoff: set to turn on DTR/RTS
580 *
581 * Called by the tty port helpers when the modem signals need to be
582 * adjusted during an open, close and hangup.
583 */
Alan Cox530646f2009-11-05 13:28:29 +0000584
Alan Cox584abc32009-11-30 13:16:09 +0000585static void uart_dtr_rts(struct tty_port *tport, int onoff)
586{
587 struct sdio_uart_port *port =
588 container_of(tport, struct sdio_uart_port, port);
Alan Cox1f100b32009-11-30 13:16:30 +0000589 int ret = sdio_uart_claim_func(port);
590 if (ret)
591 return;
Alan Cox584abc32009-11-30 13:16:09 +0000592 if (onoff == 0)
593 sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
594 else
595 sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
Alan Cox1f100b32009-11-30 13:16:30 +0000596 sdio_uart_release_func(port);
Alan Cox584abc32009-11-30 13:16:09 +0000597}
598
599/**
600 * sdio_uart_activate - start up hardware
601 * @tport: tty port to activate
602 * @tty: tty bound to this port
603 *
604 * Activate a tty port. The port locking guarantees us this will be
605 * run exactly once per set of opens, and if successful will see the
606 * shutdown method run exactly once to match. Start up and shutdown are
607 * protected from each other by the internal locking and will not run
608 * at the same time even during a hangup event.
609 *
610 * If we successfully start up the port we take an extra kref as we
611 * will keep it around until shutdown when the kref is dropped.
612 */
613
614static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty)
615{
616 struct sdio_uart_port *port =
617 container_of(tport, struct sdio_uart_port, port);
Alan Cox584abc32009-11-30 13:16:09 +0000618 int ret;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400619
620 /*
621 * Set the TTY IO error marker - we will only clear this
622 * once we have successfully opened the port.
623 */
Alan Coxb5849b12009-11-05 13:28:06 +0000624 set_bit(TTY_IO_ERROR, &tty->flags);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400625
Alan Cox8b197a52010-02-08 10:08:39 +0000626 kfifo_reset(&port->xmit_fifo);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400627
628 ret = sdio_uart_claim_func(port);
629 if (ret)
Alan Cox8b197a52010-02-08 10:08:39 +0000630 return ret;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400631 ret = sdio_enable_func(port->func);
632 if (ret)
Alan Cox8b197a52010-02-08 10:08:39 +0000633 goto err1;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400634 ret = sdio_claim_irq(port->func, sdio_uart_irq);
635 if (ret)
Alan Cox8b197a52010-02-08 10:08:39 +0000636 goto err2;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400637
638 /*
639 * Clear the FIFO buffers and disable them.
640 * (they will be reenabled in sdio_change_speed())
641 */
642 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
643 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300644 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400645 sdio_out(port, UART_FCR, 0);
646
647 /*
648 * Clear the interrupt registers.
649 */
650 (void) sdio_in(port, UART_LSR);
651 (void) sdio_in(port, UART_RX);
652 (void) sdio_in(port, UART_IIR);
653 (void) sdio_in(port, UART_MSR);
654
655 /*
656 * Now, initialize the UART
657 */
658 sdio_out(port, UART_LCR, UART_LCR_WLEN8);
659
Alan Coxc271cf32009-11-30 13:16:25 +0000660 port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400661 port->mctrl = TIOCM_OUT2;
662
Alan Coxadc8d742012-07-14 15:31:47 +0100663 sdio_uart_change_speed(port, &tty->termios, NULL);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400664
Alan Coxadc8d742012-07-14 15:31:47 +0100665 if (tty->termios.c_cflag & CBAUD)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400666 sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
667
Alan Coxadc8d742012-07-14 15:31:47 +0100668 if (tty->termios.c_cflag & CRTSCTS)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400669 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
Alan Coxb5849b12009-11-05 13:28:06 +0000670 tty->hw_stopped = 1;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400671
Nicolas Pitre0395b482009-11-05 13:28:17 +0000672 clear_bit(TTY_IO_ERROR, &tty->flags);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400673
674 /* Kick the IRQ handler once while we're still holding the host lock */
675 sdio_uart_irq(port->func);
676
677 sdio_uart_release_func(port);
678 return 0;
679
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400680err2:
Alan Cox8b197a52010-02-08 10:08:39 +0000681 sdio_disable_func(port->func);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400682err1:
Alan Cox8b197a52010-02-08 10:08:39 +0000683 sdio_uart_release_func(port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400684 return ret;
685}
686
Alan Cox584abc32009-11-30 13:16:09 +0000687/**
688 * sdio_uart_shutdown - stop hardware
689 * @tport: tty port to shut down
690 *
691 * Deactivate a tty port. The port locking guarantees us this will be
692 * run only if a successful matching activate already ran. The two are
693 * protected from each other by the internal locking and will not run
694 * at the same time even during a hangup event.
695 */
696
697static void sdio_uart_shutdown(struct tty_port *tport)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400698{
Alan Cox584abc32009-11-30 13:16:09 +0000699 struct sdio_uart_port *port =
700 container_of(tport, struct sdio_uart_port, port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400701 int ret;
702
703 ret = sdio_uart_claim_func(port);
704 if (ret)
Alan Cox8b197a52010-02-08 10:08:39 +0000705 return;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400706
707 sdio_uart_stop_rx(port);
708
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300709 /* Disable interrupts from this port */
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400710 sdio_release_irq(port->func);
711 port->ier = 0;
712 sdio_out(port, UART_IER, 0);
713
714 sdio_uart_clear_mctrl(port, TIOCM_OUT2);
715
716 /* Disable break condition and FIFOs. */
717 port->lcr &= ~UART_LCR_SBC;
718 sdio_out(port, UART_LCR, port->lcr);
719 sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
720 UART_FCR_CLEAR_RCVR |
721 UART_FCR_CLEAR_XMIT);
722 sdio_out(port, UART_FCR, 0);
723
724 sdio_disable_func(port->func);
725
726 sdio_uart_release_func(port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400727}
728
Jiri Slabye70c6772012-11-15 09:49:52 +0100729static void sdio_uart_port_destroy(struct tty_port *tport)
730{
731 struct sdio_uart_port *port =
732 container_of(tport, struct sdio_uart_port, port);
733 kfifo_free(&port->xmit_fifo);
734 kfree(port);
735}
736
Alan Cox584abc32009-11-30 13:16:09 +0000737/**
738 * sdio_uart_install - install method
739 * @driver: the driver in use (sdio_uart in our case)
740 * @tty: the tty being bound
741 *
742 * Look up and bind the tty and the driver together. Initialize
743 * any needed private data (in our case the termios)
744 */
745
746static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty)
747{
748 int idx = tty->index;
749 struct sdio_uart_port *port = sdio_uart_port_get(idx);
Jiri Slaby81f58352012-01-30 21:14:30 +0100750 int ret = tty_standard_install(driver, tty);
Alan Cox584abc32009-11-30 13:16:09 +0000751
Jiri Slaby81f58352012-01-30 21:14:30 +0100752 if (ret == 0)
Alan Cox584abc32009-11-30 13:16:09 +0000753 /* This is the ref sdio_uart_port get provided */
754 tty->driver_data = port;
Jiri Slaby81f58352012-01-30 21:14:30 +0100755 else
Alan Cox584abc32009-11-30 13:16:09 +0000756 sdio_uart_port_put(port);
757 return ret;
Alan Cox584abc32009-11-30 13:16:09 +0000758}
759
760/**
761 * sdio_uart_cleanup - called on the last tty kref drop
762 * @tty: the tty being destroyed
763 *
764 * Called asynchronously when the last reference to the tty is dropped.
765 * We cannot destroy the tty->driver_data port kref until this point
766 */
767
768static void sdio_uart_cleanup(struct tty_struct *tty)
769{
770 struct sdio_uart_port *port = tty->driver_data;
771 tty->driver_data = NULL; /* Bug trap */
772 sdio_uart_port_put(port);
773}
774
775/*
776 * Open/close/hangup is now entirely boilerplate
777 */
778
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300779static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400780{
Alan Cox584abc32009-11-30 13:16:09 +0000781 struct sdio_uart_port *port = tty->driver_data;
782 return tty_port_open(&port->port, tty, filp);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400783}
784
785static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
786{
787 struct sdio_uart_port *port = tty->driver_data;
Alan Cox584abc32009-11-30 13:16:09 +0000788 tty_port_close(&port->port, tty, filp);
789}
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400790
Alan Cox584abc32009-11-30 13:16:09 +0000791static void sdio_uart_hangup(struct tty_struct *tty)
792{
793 struct sdio_uart_port *port = tty->driver_data;
794 tty_port_hangup(&port->port);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400795}
796
Alan Coxc271cf32009-11-30 13:16:25 +0000797static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf,
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400798 int count)
799{
800 struct sdio_uart_port *port = tty->driver_data;
Alan Cox8b197a52010-02-08 10:08:39 +0000801 int ret;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400802
803 if (!port->func)
804 return -ENODEV;
805
Alan Cox8b197a52010-02-08 10:08:39 +0000806 ret = kfifo_in_locked(&port->xmit_fifo, buf, count, &port->write_lock);
Alan Coxc271cf32009-11-30 13:16:25 +0000807 if (!(port->ier & UART_IER_THRI)) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400808 int err = sdio_uart_claim_func(port);
809 if (!err) {
810 sdio_uart_start_tx(port);
811 sdio_uart_irq(port->func);
812 sdio_uart_release_func(port);
813 } else
814 ret = err;
815 }
816
817 return ret;
818}
819
820static int sdio_uart_write_room(struct tty_struct *tty)
821{
822 struct sdio_uart_port *port = tty->driver_data;
Alan Cox8b197a52010-02-08 10:08:39 +0000823 return FIFO_SIZE - kfifo_len(&port->xmit_fifo);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400824}
825
826static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
827{
828 struct sdio_uart_port *port = tty->driver_data;
Alan Cox8b197a52010-02-08 10:08:39 +0000829 return kfifo_len(&port->xmit_fifo);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400830}
831
832static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
833{
834 struct sdio_uart_port *port = tty->driver_data;
835
836 port->x_char = ch;
837 if (ch && !(port->ier & UART_IER_THRI)) {
838 if (sdio_uart_claim_func(port) != 0)
839 return;
840 sdio_uart_start_tx(port);
841 sdio_uart_irq(port->func);
842 sdio_uart_release_func(port);
843 }
844}
845
846static void sdio_uart_throttle(struct tty_struct *tty)
847{
848 struct sdio_uart_port *port = tty->driver_data;
849
Alan Coxadc8d742012-07-14 15:31:47 +0100850 if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS))
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400851 return;
852
853 if (sdio_uart_claim_func(port) != 0)
854 return;
855
856 if (I_IXOFF(tty)) {
857 port->x_char = STOP_CHAR(tty);
858 sdio_uart_start_tx(port);
859 }
860
Alan Coxadc8d742012-07-14 15:31:47 +0100861 if (tty->termios.c_cflag & CRTSCTS)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400862 sdio_uart_clear_mctrl(port, TIOCM_RTS);
863
864 sdio_uart_irq(port->func);
865 sdio_uart_release_func(port);
866}
867
868static void sdio_uart_unthrottle(struct tty_struct *tty)
869{
870 struct sdio_uart_port *port = tty->driver_data;
871
Alan Coxadc8d742012-07-14 15:31:47 +0100872 if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS))
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400873 return;
874
875 if (sdio_uart_claim_func(port) != 0)
876 return;
877
878 if (I_IXOFF(tty)) {
879 if (port->x_char) {
880 port->x_char = 0;
881 } else {
882 port->x_char = START_CHAR(tty);
883 sdio_uart_start_tx(port);
884 }
885 }
886
Alan Coxadc8d742012-07-14 15:31:47 +0100887 if (tty->termios.c_cflag & CRTSCTS)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400888 sdio_uart_set_mctrl(port, TIOCM_RTS);
889
890 sdio_uart_irq(port->func);
891 sdio_uart_release_func(port);
892}
893
Alan Coxc271cf32009-11-30 13:16:25 +0000894static void sdio_uart_set_termios(struct tty_struct *tty,
895 struct ktermios *old_termios)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400896{
897 struct sdio_uart_port *port = tty->driver_data;
Alan Coxadc8d742012-07-14 15:31:47 +0100898 unsigned int cflag = tty->termios.c_cflag;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400899
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400900 if (sdio_uart_claim_func(port) != 0)
901 return;
902
Alan Coxadc8d742012-07-14 15:31:47 +0100903 sdio_uart_change_speed(port, &tty->termios, old_termios);
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400904
905 /* Handle transition to B0 status */
906 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
907 sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
908
909 /* Handle transition away from B0 status */
910 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
911 unsigned int mask = TIOCM_DTR;
912 if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
913 mask |= TIOCM_RTS;
914 sdio_uart_set_mctrl(port, mask);
915 }
916
917 /* Handle turning off CRTSCTS */
918 if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
919 tty->hw_stopped = 0;
920 sdio_uart_start_tx(port);
921 }
922
923 /* Handle turning on CRTSCTS */
924 if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
925 if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
926 tty->hw_stopped = 1;
927 sdio_uart_stop_tx(port);
928 }
929 }
930
931 sdio_uart_release_func(port);
932}
933
David Howellsc43d8632008-07-10 12:28:48 +0100934static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400935{
936 struct sdio_uart_port *port = tty->driver_data;
David Howellsc43d8632008-07-10 12:28:48 +0100937 int result;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400938
David Howellsc43d8632008-07-10 12:28:48 +0100939 result = sdio_uart_claim_func(port);
940 if (result != 0)
941 return result;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400942
943 if (break_state == -1)
944 port->lcr |= UART_LCR_SBC;
945 else
946 port->lcr &= ~UART_LCR_SBC;
947 sdio_out(port, UART_LCR, port->lcr);
948
949 sdio_uart_release_func(port);
David Howellsc43d8632008-07-10 12:28:48 +0100950 return 0;
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400951}
952
Alan Cox60b33c12011-02-14 16:26:14 +0000953static int sdio_uart_tiocmget(struct tty_struct *tty)
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400954{
955 struct sdio_uart_port *port = tty->driver_data;
956 int result;
957
958 result = sdio_uart_claim_func(port);
959 if (!result) {
960 result = port->mctrl | sdio_uart_get_mctrl(port);
961 sdio_uart_release_func(port);
962 }
963
964 return result;
965}
966
Alan Cox20b9d172011-02-14 16:26:50 +0000967static int sdio_uart_tiocmset(struct tty_struct *tty,
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400968 unsigned int set, unsigned int clear)
969{
970 struct sdio_uart_port *port = tty->driver_data;
971 int result;
972
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300973 result = sdio_uart_claim_func(port);
Alan Coxc271cf32009-11-30 13:16:25 +0000974 if (!result) {
Nicolas Pitre6e418a92007-06-30 02:04:21 -0400975 sdio_uart_update_mctrl(port, set, clear);
976 sdio_uart_release_func(port);
977 }
978
979 return result;
980}
981
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700982static int sdio_uart_proc_show(struct seq_file *m, void *v)
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400983{
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700984 int i;
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400985
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700986 seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400987 "", "", "");
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700988 for (i = 0; i < UART_NR; i++) {
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400989 struct sdio_uart_port *port = sdio_uart_port_get(i);
990 if (port) {
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700991 seq_printf(m, "%d: uart:SDIO", i);
Alan Coxc271cf32009-11-30 13:16:25 +0000992 if (capable(CAP_SYS_ADMIN)) {
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700993 seq_printf(m, " tx:%d rx:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300994 port->icount.tx, port->icount.rx);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400995 if (port->icount.frame)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700996 seq_printf(m, " fe:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -0300997 port->icount.frame);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -0400998 if (port->icount.parity)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -0700999 seq_printf(m, " pe:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001000 port->icount.parity);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001001 if (port->icount.brk)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001002 seq_printf(m, " brk:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001003 port->icount.brk);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001004 if (port->icount.overrun)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001005 seq_printf(m, " oe:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001006 port->icount.overrun);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001007 if (port->icount.cts)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001008 seq_printf(m, " cts:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001009 port->icount.cts);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001010 if (port->icount.dsr)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001011 seq_printf(m, " dsr:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001012 port->icount.dsr);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001013 if (port->icount.rng)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001014 seq_printf(m, " rng:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001015 port->icount.rng);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001016 if (port->icount.dcd)
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001017 seq_printf(m, " dcd:%d",
Thadeu Lima de Souza Cascardo1e04b7a2009-10-15 16:44:00 -03001018 port->icount.dcd);
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001019 }
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001020 sdio_uart_port_put(port);
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001021 seq_putc(m, '\n');
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001022 }
1023 }
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001024 return 0;
Nicolas Pitre5ed334a2007-07-04 23:40:34 -04001025}
1026
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001027static int sdio_uart_proc_open(struct inode *inode, struct file *file)
1028{
1029 return single_open(file, sdio_uart_proc_show, NULL);
1030}
1031
1032static const struct file_operations sdio_uart_proc_fops = {
1033 .owner = THIS_MODULE,
1034 .open = sdio_uart_proc_open,
1035 .read = seq_read,
1036 .llseek = seq_lseek,
1037 .release = single_release,
1038};
1039
Alan Cox584abc32009-11-30 13:16:09 +00001040static const struct tty_port_operations sdio_uart_port_ops = {
1041 .dtr_rts = uart_dtr_rts,
Alan Cox4b3b49b2009-11-30 13:16:36 +00001042 .carrier_raised = uart_carrier_raised,
Alan Cox584abc32009-11-30 13:16:09 +00001043 .shutdown = sdio_uart_shutdown,
1044 .activate = sdio_uart_activate,
Jiri Slabye70c6772012-11-15 09:49:52 +01001045 .destruct = sdio_uart_port_destroy,
Alan Cox584abc32009-11-30 13:16:09 +00001046};
1047
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001048static const struct tty_operations sdio_uart_ops = {
1049 .open = sdio_uart_open,
1050 .close = sdio_uart_close,
1051 .write = sdio_uart_write,
1052 .write_room = sdio_uart_write_room,
1053 .chars_in_buffer = sdio_uart_chars_in_buffer,
1054 .send_xchar = sdio_uart_send_xchar,
1055 .throttle = sdio_uart_throttle,
1056 .unthrottle = sdio_uart_unthrottle,
1057 .set_termios = sdio_uart_set_termios,
Alan Cox584abc32009-11-30 13:16:09 +00001058 .hangup = sdio_uart_hangup,
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001059 .break_ctl = sdio_uart_break_ctl,
1060 .tiocmget = sdio_uart_tiocmget,
1061 .tiocmset = sdio_uart_tiocmset,
Alan Cox584abc32009-11-30 13:16:09 +00001062 .install = sdio_uart_install,
1063 .cleanup = sdio_uart_cleanup,
Alexey Dobriyan201a50b2009-03-31 15:19:20 -07001064 .proc_fops = &sdio_uart_proc_fops,
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001065};
1066
1067static struct tty_driver *sdio_uart_tty_driver;
1068
1069static int sdio_uart_probe(struct sdio_func *func,
1070 const struct sdio_device_id *id)
1071{
1072 struct sdio_uart_port *port;
1073 int ret;
1074
1075 port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
1076 if (!port)
1077 return -ENOMEM;
1078
1079 if (func->class == SDIO_CLASS_UART) {
Girish K Sa3c76eb2011-10-11 11:44:09 +05301080 pr_warning("%s: need info on UART class basic setup\n",
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001081 sdio_func_id(func));
1082 kfree(port);
1083 return -ENOSYS;
1084 } else if (func->class == SDIO_CLASS_GPS) {
1085 /*
1086 * We need tuple 0x91. It contains SUBTPL_SIOREG
1087 * and SUBTPL_RCVCAPS.
1088 */
1089 struct sdio_func_tuple *tpl;
1090 for (tpl = func->tuples; tpl; tpl = tpl->next) {
1091 if (tpl->code != 0x91)
1092 continue;
1093 if (tpl->size < 10)
1094 continue;
1095 if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
1096 break;
1097 }
1098 if (!tpl) {
Girish K Sa3c76eb2011-10-11 11:44:09 +05301099 pr_warning(
Alan Coxc271cf32009-11-30 13:16:25 +00001100 "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001101 sdio_func_id(func));
1102 kfree(port);
1103 return -EINVAL;
1104 }
Girish K Sa3c76eb2011-10-11 11:44:09 +05301105 pr_debug("%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001106 sdio_func_id(func), tpl->data[2], tpl->data[3]);
1107 port->regs_offset = (tpl->data[4] << 0) |
1108 (tpl->data[5] << 8) |
1109 (tpl->data[6] << 16);
Girish K Sa3c76eb2011-10-11 11:44:09 +05301110 pr_debug("%s: regs offset = 0x%x\n",
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001111 sdio_func_id(func), port->regs_offset);
1112 port->uartclk = tpl->data[7] * 115200;
1113 if (port->uartclk == 0)
1114 port->uartclk = 115200;
Girish K Sa3c76eb2011-10-11 11:44:09 +05301115 pr_debug("%s: clk %d baudcode %u 4800-div %u\n",
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001116 sdio_func_id(func), port->uartclk,
1117 tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
1118 } else {
1119 kfree(port);
1120 return -EINVAL;
1121 }
1122
1123 port->func = func;
1124 sdio_set_drvdata(func, port);
Alan Coxb5849b12009-11-05 13:28:06 +00001125 tty_port_init(&port->port);
Alan Cox584abc32009-11-30 13:16:09 +00001126 port->port.ops = &sdio_uart_port_ops;
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001127
1128 ret = sdio_uart_add_port(port);
1129 if (ret) {
1130 kfree(port);
1131 } else {
1132 struct device *dev;
Jiri Slaby734cc172012-08-07 21:47:47 +02001133 dev = tty_port_register_device(&port->port,
1134 sdio_uart_tty_driver, port->index, &func->dev);
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001135 if (IS_ERR(dev)) {
1136 sdio_uart_port_remove(port);
1137 ret = PTR_ERR(dev);
1138 }
1139 }
1140
1141 return ret;
1142}
1143
1144static void sdio_uart_remove(struct sdio_func *func)
1145{
1146 struct sdio_uart_port *port = sdio_get_drvdata(func);
1147
1148 tty_unregister_device(sdio_uart_tty_driver, port->index);
1149 sdio_uart_port_remove(port);
1150}
1151
1152static const struct sdio_device_id sdio_uart_ids[] = {
1153 { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
1154 { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
1155 { /* end: all zeroes */ },
1156};
1157
1158MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
1159
1160static struct sdio_driver sdio_uart_driver = {
1161 .probe = sdio_uart_probe,
1162 .remove = sdio_uart_remove,
1163 .name = "sdio_uart",
1164 .id_table = sdio_uart_ids,
1165};
1166
1167static int __init sdio_uart_init(void)
1168{
1169 int ret;
1170 struct tty_driver *tty_drv;
1171
1172 sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
1173 if (!tty_drv)
1174 return -ENOMEM;
1175
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001176 tty_drv->driver_name = "sdio_uart";
1177 tty_drv->name = "ttySDIO";
1178 tty_drv->major = 0; /* dynamically allocated */
1179 tty_drv->minor_start = 0;
1180 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1181 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1182 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1183 tty_drv->init_termios = tty_std_termios;
1184 tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
Nicolas Pitre2ba30ee2007-08-15 13:27:29 -04001185 tty_drv->init_termios.c_ispeed = 4800;
1186 tty_drv->init_termios.c_ospeed = 4800;
Nicolas Pitre6e418a92007-06-30 02:04:21 -04001187 tty_set_operations(tty_drv, &sdio_uart_ops);
1188
1189 ret = tty_register_driver(tty_drv);
1190 if (ret)
1191 goto err1;
1192
1193 ret = sdio_register_driver(&sdio_uart_driver);
1194 if (ret)
1195 goto err2;
1196
1197 return 0;
1198
1199err2:
1200 tty_unregister_driver(tty_drv);
1201err1:
1202 put_tty_driver(tty_drv);
1203 return ret;
1204}
1205
1206static void __exit sdio_uart_exit(void)
1207{
1208 sdio_unregister_driver(&sdio_uart_driver);
1209 tty_unregister_driver(sdio_uart_tty_driver);
1210 put_tty_driver(sdio_uart_tty_driver);
1211}
1212
1213module_init(sdio_uart_init);
1214module_exit(sdio_uart_exit);
1215
1216MODULE_AUTHOR("Nicolas Pitre");
1217MODULE_LICENSE("GPL");