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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> | |
201a50ba | 33 | #include <linux/seq_file.h> |
6e418a9d NP |
34 | #include <linux/serial_reg.h> |
35 | #include <linux/circ_buf.h> | |
36 | #include <linux/gfp.h> | |
37 | #include <linux/tty.h> | |
38 | #include <linux/tty_flip.h> | |
39 | ||
40 | #include <linux/mmc/core.h> | |
41 | #include <linux/mmc/card.h> | |
42 | #include <linux/mmc/sdio_func.h> | |
43 | #include <linux/mmc/sdio_ids.h> | |
44 | ||
45 | ||
46 | #define UART_NR 8 /* Number of UARTs this driver can handle */ | |
47 | ||
48 | ||
49 | #define UART_XMIT_SIZE PAGE_SIZE | |
50 | #define WAKEUP_CHARS 256 | |
51 | ||
52 | #define circ_empty(circ) ((circ)->head == (circ)->tail) | |
53 | #define circ_clear(circ) ((circ)->head = (circ)->tail = 0) | |
54 | ||
55 | #define circ_chars_pending(circ) \ | |
56 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
57 | ||
58 | #define circ_chars_free(circ) \ | |
59 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
60 | ||
61 | ||
62 | struct uart_icount { | |
63 | __u32 cts; | |
64 | __u32 dsr; | |
65 | __u32 rng; | |
66 | __u32 dcd; | |
67 | __u32 rx; | |
68 | __u32 tx; | |
69 | __u32 frame; | |
70 | __u32 overrun; | |
71 | __u32 parity; | |
72 | __u32 brk; | |
73 | }; | |
74 | ||
75 | struct sdio_uart_port { | |
76 | struct kref kref; | |
77 | struct tty_struct *tty; | |
78 | unsigned int index; | |
79 | unsigned int opened; | |
80 | struct mutex open_lock; | |
81 | struct sdio_func *func; | |
82 | struct mutex func_lock; | |
15b82b46 | 83 | struct task_struct *in_sdio_uart_irq; |
6e418a9d NP |
84 | unsigned int regs_offset; |
85 | struct circ_buf xmit; | |
86 | spinlock_t write_lock; | |
87 | struct uart_icount icount; | |
88 | unsigned int uartclk; | |
89 | unsigned int mctrl; | |
90 | unsigned int read_status_mask; | |
91 | unsigned int ignore_status_mask; | |
92 | unsigned char x_char; | |
93 | unsigned char ier; | |
94 | unsigned char lcr; | |
95 | }; | |
96 | ||
97 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
98 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
99 | ||
100 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
101 | { | |
102 | int index, ret = -EBUSY; | |
103 | ||
104 | kref_init(&port->kref); | |
105 | mutex_init(&port->open_lock); | |
106 | mutex_init(&port->func_lock); | |
107 | spin_lock_init(&port->write_lock); | |
108 | ||
109 | spin_lock(&sdio_uart_table_lock); | |
110 | for (index = 0; index < UART_NR; index++) { | |
111 | if (!sdio_uart_table[index]) { | |
112 | port->index = index; | |
113 | sdio_uart_table[index] = port; | |
114 | ret = 0; | |
115 | break; | |
116 | } | |
117 | } | |
118 | spin_unlock(&sdio_uart_table_lock); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | static struct sdio_uart_port *sdio_uart_port_get(unsigned index) | |
124 | { | |
125 | struct sdio_uart_port *port; | |
126 | ||
127 | if (index >= UART_NR) | |
128 | return NULL; | |
129 | ||
130 | spin_lock(&sdio_uart_table_lock); | |
131 | port = sdio_uart_table[index]; | |
132 | if (port) | |
133 | kref_get(&port->kref); | |
134 | spin_unlock(&sdio_uart_table_lock); | |
135 | ||
136 | return port; | |
137 | } | |
138 | ||
139 | static void sdio_uart_port_destroy(struct kref *kref) | |
140 | { | |
141 | struct sdio_uart_port *port = | |
142 | container_of(kref, struct sdio_uart_port, kref); | |
143 | kfree(port); | |
144 | } | |
145 | ||
146 | static void sdio_uart_port_put(struct sdio_uart_port *port) | |
147 | { | |
148 | kref_put(&port->kref, sdio_uart_port_destroy); | |
149 | } | |
150 | ||
151 | static void sdio_uart_port_remove(struct sdio_uart_port *port) | |
152 | { | |
153 | struct sdio_func *func; | |
154 | ||
155 | BUG_ON(sdio_uart_table[port->index] != port); | |
156 | ||
157 | spin_lock(&sdio_uart_table_lock); | |
158 | sdio_uart_table[port->index] = NULL; | |
159 | spin_unlock(&sdio_uart_table_lock); | |
160 | ||
161 | /* | |
162 | * We're killing a port that potentially still is in use by | |
163 | * the tty layer. Be careful to prevent any further access | |
164 | * to the SDIO function and arrange for the tty layer to | |
165 | * give up on that port ASAP. | |
166 | * Beware: the lock ordering is critical. | |
167 | */ | |
168 | mutex_lock(&port->open_lock); | |
169 | mutex_lock(&port->func_lock); | |
170 | func = port->func; | |
171 | sdio_claim_host(func); | |
172 | port->func = NULL; | |
173 | mutex_unlock(&port->func_lock); | |
174 | if (port->opened) | |
175 | tty_hangup(port->tty); | |
176 | mutex_unlock(&port->open_lock); | |
177 | sdio_release_irq(func); | |
178 | sdio_disable_func(func); | |
179 | sdio_release_host(func); | |
180 | ||
181 | sdio_uart_port_put(port); | |
182 | } | |
183 | ||
184 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
185 | { | |
186 | mutex_lock(&port->func_lock); | |
187 | if (unlikely(!port->func)) { | |
188 | mutex_unlock(&port->func_lock); | |
189 | return -ENODEV; | |
190 | } | |
15b82b46 NP |
191 | if (likely(port->in_sdio_uart_irq != current)) |
192 | sdio_claim_host(port->func); | |
6e418a9d NP |
193 | mutex_unlock(&port->func_lock); |
194 | return 0; | |
195 | } | |
196 | ||
197 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
198 | { | |
15b82b46 NP |
199 | if (likely(port->in_sdio_uart_irq != current)) |
200 | sdio_release_host(port->func); | |
6e418a9d NP |
201 | } |
202 | ||
203 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
204 | { | |
205 | unsigned char c; | |
206 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
207 | return c; | |
208 | } | |
209 | ||
210 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
211 | { | |
212 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
213 | } | |
214 | ||
215 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
216 | { | |
217 | unsigned char status; | |
218 | unsigned int ret; | |
219 | ||
220 | status = sdio_in(port, UART_MSR); | |
221 | ||
222 | ret = 0; | |
223 | if (status & UART_MSR_DCD) | |
224 | ret |= TIOCM_CAR; | |
225 | if (status & UART_MSR_RI) | |
226 | ret |= TIOCM_RNG; | |
227 | if (status & UART_MSR_DSR) | |
228 | ret |= TIOCM_DSR; | |
229 | if (status & UART_MSR_CTS) | |
230 | ret |= TIOCM_CTS; | |
231 | return ret; | |
232 | } | |
233 | ||
1e04b7ae TLSC |
234 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, |
235 | unsigned int mctrl) | |
6e418a9d NP |
236 | { |
237 | unsigned char mcr = 0; | |
238 | ||
239 | if (mctrl & TIOCM_RTS) | |
240 | mcr |= UART_MCR_RTS; | |
241 | if (mctrl & TIOCM_DTR) | |
242 | mcr |= UART_MCR_DTR; | |
243 | if (mctrl & TIOCM_OUT1) | |
244 | mcr |= UART_MCR_OUT1; | |
245 | if (mctrl & TIOCM_OUT2) | |
246 | mcr |= UART_MCR_OUT2; | |
247 | if (mctrl & TIOCM_LOOP) | |
248 | mcr |= UART_MCR_LOOP; | |
249 | ||
250 | sdio_out(port, UART_MCR, mcr); | |
251 | } | |
252 | ||
253 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
254 | unsigned int set, unsigned int clear) | |
255 | { | |
256 | unsigned int old; | |
257 | ||
258 | old = port->mctrl; | |
259 | port->mctrl = (old & ~clear) | set; | |
260 | if (old != port->mctrl) | |
261 | sdio_uart_write_mctrl(port, port->mctrl); | |
262 | } | |
263 | ||
264 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
265 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
266 | ||
267 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
268 | struct ktermios *termios, | |
269 | struct ktermios *old) | |
270 | { | |
271 | unsigned char cval, fcr = 0; | |
272 | unsigned int baud, quot; | |
273 | ||
274 | switch (termios->c_cflag & CSIZE) { | |
275 | case CS5: | |
276 | cval = UART_LCR_WLEN5; | |
277 | break; | |
278 | case CS6: | |
279 | cval = UART_LCR_WLEN6; | |
280 | break; | |
281 | case CS7: | |
282 | cval = UART_LCR_WLEN7; | |
283 | break; | |
284 | default: | |
285 | case CS8: | |
286 | cval = UART_LCR_WLEN8; | |
287 | break; | |
288 | } | |
289 | ||
290 | if (termios->c_cflag & CSTOPB) | |
291 | cval |= UART_LCR_STOP; | |
292 | if (termios->c_cflag & PARENB) | |
293 | cval |= UART_LCR_PARITY; | |
294 | if (!(termios->c_cflag & PARODD)) | |
295 | cval |= UART_LCR_EPAR; | |
296 | ||
297 | for (;;) { | |
298 | baud = tty_termios_baud_rate(termios); | |
299 | if (baud == 0) | |
300 | baud = 9600; /* Special case: B0 rate. */ | |
301 | if (baud <= port->uartclk) | |
302 | break; | |
303 | /* | |
304 | * Oops, the quotient was zero. Try again with the old | |
305 | * baud rate if possible, otherwise default to 9600. | |
306 | */ | |
307 | termios->c_cflag &= ~CBAUD; | |
308 | if (old) { | |
309 | termios->c_cflag |= old->c_cflag & CBAUD; | |
310 | old = NULL; | |
311 | } else | |
312 | termios->c_cflag |= B9600; | |
313 | } | |
314 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
315 | ||
316 | if (baud < 2400) | |
317 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
318 | else | |
319 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
320 | ||
321 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
322 | if (termios->c_iflag & INPCK) | |
323 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
324 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
325 | port->read_status_mask |= UART_LSR_BI; | |
326 | ||
327 | /* | |
328 | * Characters to ignore | |
329 | */ | |
330 | port->ignore_status_mask = 0; | |
331 | if (termios->c_iflag & IGNPAR) | |
332 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
333 | if (termios->c_iflag & IGNBRK) { | |
334 | port->ignore_status_mask |= UART_LSR_BI; | |
335 | /* | |
336 | * If we're ignoring parity and break indicators, | |
337 | * ignore overruns too (for real raw support). | |
338 | */ | |
339 | if (termios->c_iflag & IGNPAR) | |
340 | port->ignore_status_mask |= UART_LSR_OE; | |
341 | } | |
342 | ||
343 | /* | |
344 | * ignore all characters if CREAD is not set | |
345 | */ | |
346 | if ((termios->c_cflag & CREAD) == 0) | |
347 | port->ignore_status_mask |= UART_LSR_DR; | |
348 | ||
349 | /* | |
350 | * CTS flow control flag and modem status interrupts | |
351 | */ | |
352 | port->ier &= ~UART_IER_MSI; | |
353 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
354 | port->ier |= UART_IER_MSI; | |
355 | ||
356 | port->lcr = cval; | |
357 | ||
358 | sdio_out(port, UART_IER, port->ier); | |
359 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
360 | sdio_out(port, UART_DLL, quot & 0xff); | |
361 | sdio_out(port, UART_DLM, quot >> 8); | |
362 | sdio_out(port, UART_LCR, cval); | |
363 | sdio_out(port, UART_FCR, fcr); | |
364 | ||
365 | sdio_uart_write_mctrl(port, port->mctrl); | |
366 | } | |
367 | ||
368 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
369 | { | |
370 | if (!(port->ier & UART_IER_THRI)) { | |
371 | port->ier |= UART_IER_THRI; | |
372 | sdio_out(port, UART_IER, port->ier); | |
373 | } | |
374 | } | |
375 | ||
376 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
377 | { | |
378 | if (port->ier & UART_IER_THRI) { | |
379 | port->ier &= ~UART_IER_THRI; | |
380 | sdio_out(port, UART_IER, port->ier); | |
381 | } | |
382 | } | |
383 | ||
384 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
385 | { | |
386 | port->ier &= ~UART_IER_RLSI; | |
387 | port->read_status_mask &= ~UART_LSR_DR; | |
388 | sdio_out(port, UART_IER, port->ier); | |
389 | } | |
390 | ||
1e04b7ae TLSC |
391 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, |
392 | unsigned int *status) | |
6e418a9d NP |
393 | { |
394 | struct tty_struct *tty = port->tty; | |
395 | unsigned int ch, flag; | |
396 | int max_count = 256; | |
397 | ||
398 | do { | |
399 | ch = sdio_in(port, UART_RX); | |
400 | flag = TTY_NORMAL; | |
401 | port->icount.rx++; | |
402 | ||
403 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
1e04b7ae | 404 | UART_LSR_FE | UART_LSR_OE))) { |
6e418a9d NP |
405 | /* |
406 | * For statistics only | |
407 | */ | |
408 | if (*status & UART_LSR_BI) { | |
409 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
410 | port->icount.brk++; | |
411 | } else if (*status & UART_LSR_PE) | |
412 | port->icount.parity++; | |
413 | else if (*status & UART_LSR_FE) | |
414 | port->icount.frame++; | |
415 | if (*status & UART_LSR_OE) | |
416 | port->icount.overrun++; | |
417 | ||
418 | /* | |
419 | * Mask off conditions which should be ignored. | |
420 | */ | |
421 | *status &= port->read_status_mask; | |
1e04b7ae | 422 | if (*status & UART_LSR_BI) |
6e418a9d | 423 | flag = TTY_BREAK; |
1e04b7ae | 424 | else if (*status & UART_LSR_PE) |
6e418a9d NP |
425 | flag = TTY_PARITY; |
426 | else if (*status & UART_LSR_FE) | |
427 | flag = TTY_FRAME; | |
428 | } | |
429 | ||
430 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
431 | tty_insert_flip_char(tty, ch, flag); | |
432 | ||
433 | /* | |
434 | * Overrun is special. Since it's reported immediately, | |
435 | * it doesn't affect the current character. | |
436 | */ | |
437 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
438 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
439 | ||
440 | *status = sdio_in(port, UART_LSR); | |
441 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
442 | tty_flip_buffer_push(tty); | |
443 | } | |
444 | ||
445 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
446 | { | |
447 | struct circ_buf *xmit = &port->xmit; | |
448 | int count; | |
449 | ||
450 | if (port->x_char) { | |
451 | sdio_out(port, UART_TX, port->x_char); | |
452 | port->icount.tx++; | |
453 | port->x_char = 0; | |
454 | return; | |
455 | } | |
456 | if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) { | |
457 | sdio_uart_stop_tx(port); | |
458 | return; | |
459 | } | |
460 | ||
461 | count = 16; | |
462 | do { | |
463 | sdio_out(port, UART_TX, xmit->buf[xmit->tail]); | |
464 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
465 | port->icount.tx++; | |
466 | if (circ_empty(xmit)) | |
467 | break; | |
468 | } while (--count > 0); | |
469 | ||
470 | if (circ_chars_pending(xmit) < WAKEUP_CHARS) | |
471 | tty_wakeup(port->tty); | |
472 | ||
473 | if (circ_empty(xmit)) | |
474 | sdio_uart_stop_tx(port); | |
475 | } | |
476 | ||
477 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
478 | { | |
479 | int status; | |
480 | ||
481 | status = sdio_in(port, UART_MSR); | |
482 | ||
483 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
484 | return; | |
485 | ||
486 | if (status & UART_MSR_TERI) | |
487 | port->icount.rng++; | |
488 | if (status & UART_MSR_DDSR) | |
489 | port->icount.dsr++; | |
490 | if (status & UART_MSR_DDCD) | |
491 | port->icount.dcd++; | |
492 | if (status & UART_MSR_DCTS) { | |
493 | port->icount.cts++; | |
494 | if (port->tty->termios->c_cflag & CRTSCTS) { | |
495 | int cts = (status & UART_MSR_CTS); | |
496 | if (port->tty->hw_stopped) { | |
497 | if (cts) { | |
498 | port->tty->hw_stopped = 0; | |
499 | sdio_uart_start_tx(port); | |
500 | tty_wakeup(port->tty); | |
501 | } | |
502 | } else { | |
503 | if (!cts) { | |
504 | port->tty->hw_stopped = 1; | |
505 | sdio_uart_stop_tx(port); | |
506 | } | |
507 | } | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
512 | /* | |
513 | * This handles the interrupt from one port. | |
514 | */ | |
515 | static void sdio_uart_irq(struct sdio_func *func) | |
516 | { | |
517 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
518 | unsigned int iir, lsr; | |
519 | ||
15b82b46 NP |
520 | /* |
521 | * In a few places sdio_uart_irq() is called directly instead of | |
522 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
523 | * thread scheduled in order to reduce latency. However, some | |
524 | * interaction with the tty core may end up calling us back | |
525 | * (serial echo, flow control, etc.) through those same places | |
526 | * causing undesirable effects. Let's stop the recursion here. | |
527 | */ | |
528 | if (unlikely(port->in_sdio_uart_irq == current)) | |
529 | return; | |
530 | ||
6e418a9d NP |
531 | iir = sdio_in(port, UART_IIR); |
532 | if (iir & UART_IIR_NO_INT) | |
533 | return; | |
15b82b46 NP |
534 | |
535 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
536 | lsr = sdio_in(port, UART_LSR); |
537 | if (lsr & UART_LSR_DR) | |
538 | sdio_uart_receive_chars(port, &lsr); | |
539 | sdio_uart_check_modem_status(port); | |
540 | if (lsr & UART_LSR_THRE) | |
541 | sdio_uart_transmit_chars(port); | |
15b82b46 | 542 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
543 | } |
544 | ||
545 | static int sdio_uart_startup(struct sdio_uart_port *port) | |
546 | { | |
547 | unsigned long page; | |
548 | int ret; | |
549 | ||
550 | /* | |
551 | * Set the TTY IO error marker - we will only clear this | |
552 | * once we have successfully opened the port. | |
553 | */ | |
554 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
555 | ||
556 | /* Initialise and allocate the transmit buffer. */ | |
557 | page = __get_free_page(GFP_KERNEL); | |
558 | if (!page) | |
559 | return -ENOMEM; | |
560 | port->xmit.buf = (unsigned char *)page; | |
561 | circ_clear(&port->xmit); | |
562 | ||
563 | ret = sdio_uart_claim_func(port); | |
564 | if (ret) | |
565 | goto err1; | |
566 | ret = sdio_enable_func(port->func); | |
567 | if (ret) | |
568 | goto err2; | |
569 | ret = sdio_claim_irq(port->func, sdio_uart_irq); | |
570 | if (ret) | |
571 | goto err3; | |
572 | ||
573 | /* | |
574 | * Clear the FIFO buffers and disable them. | |
575 | * (they will be reenabled in sdio_change_speed()) | |
576 | */ | |
577 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
578 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1e04b7ae | 579 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
6e418a9d NP |
580 | sdio_out(port, UART_FCR, 0); |
581 | ||
582 | /* | |
583 | * Clear the interrupt registers. | |
584 | */ | |
585 | (void) sdio_in(port, UART_LSR); | |
586 | (void) sdio_in(port, UART_RX); | |
587 | (void) sdio_in(port, UART_IIR); | |
588 | (void) sdio_in(port, UART_MSR); | |
589 | ||
590 | /* | |
591 | * Now, initialize the UART | |
592 | */ | |
593 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
594 | ||
595 | port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; | |
596 | port->mctrl = TIOCM_OUT2; | |
597 | ||
598 | sdio_uart_change_speed(port, port->tty->termios, NULL); | |
599 | ||
600 | if (port->tty->termios->c_cflag & CBAUD) | |
601 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
602 | ||
603 | if (port->tty->termios->c_cflag & CRTSCTS) | |
604 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) | |
605 | port->tty->hw_stopped = 1; | |
606 | ||
607 | clear_bit(TTY_IO_ERROR, &port->tty->flags); | |
608 | ||
609 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
610 | sdio_uart_irq(port->func); | |
611 | ||
612 | sdio_uart_release_func(port); | |
613 | return 0; | |
614 | ||
615 | err3: | |
616 | sdio_disable_func(port->func); | |
617 | err2: | |
618 | sdio_uart_release_func(port); | |
619 | err1: | |
620 | free_page((unsigned long)port->xmit.buf); | |
621 | return ret; | |
622 | } | |
623 | ||
624 | static void sdio_uart_shutdown(struct sdio_uart_port *port) | |
625 | { | |
626 | int ret; | |
627 | ||
628 | ret = sdio_uart_claim_func(port); | |
629 | if (ret) | |
630 | goto skip; | |
631 | ||
632 | sdio_uart_stop_rx(port); | |
633 | ||
634 | /* TODO: wait here for TX FIFO to drain */ | |
635 | ||
636 | /* Turn off DTR and RTS early. */ | |
637 | if (port->tty->termios->c_cflag & HUPCL) | |
638 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
639 | ||
1e04b7ae | 640 | /* Disable interrupts from this port */ |
6e418a9d NP |
641 | sdio_release_irq(port->func); |
642 | port->ier = 0; | |
643 | sdio_out(port, UART_IER, 0); | |
644 | ||
645 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
646 | ||
647 | /* Disable break condition and FIFOs. */ | |
648 | port->lcr &= ~UART_LCR_SBC; | |
649 | sdio_out(port, UART_LCR, port->lcr); | |
650 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
651 | UART_FCR_CLEAR_RCVR | | |
652 | UART_FCR_CLEAR_XMIT); | |
653 | sdio_out(port, UART_FCR, 0); | |
654 | ||
655 | sdio_disable_func(port->func); | |
656 | ||
657 | sdio_uart_release_func(port); | |
658 | ||
659 | skip: | |
660 | /* Free the transmit buffer page. */ | |
661 | free_page((unsigned long)port->xmit.buf); | |
662 | } | |
663 | ||
1e04b7ae | 664 | static int sdio_uart_open(struct tty_struct *tty, struct file *filp) |
6e418a9d NP |
665 | { |
666 | struct sdio_uart_port *port; | |
667 | int ret; | |
668 | ||
669 | port = sdio_uart_port_get(tty->index); | |
670 | if (!port) | |
671 | return -ENODEV; | |
672 | ||
673 | mutex_lock(&port->open_lock); | |
674 | ||
675 | /* | |
676 | * Make sure not to mess up with a dead port | |
677 | * which has not been closed yet. | |
678 | */ | |
679 | if (tty->driver_data && tty->driver_data != port) { | |
680 | mutex_unlock(&port->open_lock); | |
681 | sdio_uart_port_put(port); | |
682 | return -EBUSY; | |
683 | } | |
684 | ||
685 | if (!port->opened) { | |
686 | tty->driver_data = port; | |
687 | port->tty = tty; | |
688 | ret = sdio_uart_startup(port); | |
689 | if (ret) { | |
690 | tty->driver_data = NULL; | |
691 | port->tty = NULL; | |
692 | mutex_unlock(&port->open_lock); | |
693 | sdio_uart_port_put(port); | |
694 | return ret; | |
695 | } | |
696 | } | |
697 | port->opened++; | |
698 | mutex_unlock(&port->open_lock); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) | |
703 | { | |
704 | struct sdio_uart_port *port = tty->driver_data; | |
705 | ||
706 | if (!port) | |
707 | return; | |
708 | ||
709 | mutex_lock(&port->open_lock); | |
710 | BUG_ON(!port->opened); | |
711 | ||
712 | /* | |
713 | * This is messy. The tty layer calls us even when open() | |
714 | * returned an error. Ignore this close request if tty->count | |
715 | * is larger than port->count. | |
716 | */ | |
717 | if (tty->count > port->opened) { | |
718 | mutex_unlock(&port->open_lock); | |
719 | return; | |
720 | } | |
721 | ||
722 | if (--port->opened == 0) { | |
723 | tty->closing = 1; | |
724 | sdio_uart_shutdown(port); | |
725 | tty_ldisc_flush(tty); | |
726 | port->tty = NULL; | |
727 | tty->driver_data = NULL; | |
728 | tty->closing = 0; | |
729 | } | |
730 | mutex_unlock(&port->open_lock); | |
731 | sdio_uart_port_put(port); | |
732 | } | |
733 | ||
734 | static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf, | |
735 | int count) | |
736 | { | |
737 | struct sdio_uart_port *port = tty->driver_data; | |
738 | struct circ_buf *circ = &port->xmit; | |
739 | int c, ret = 0; | |
740 | ||
741 | if (!port->func) | |
742 | return -ENODEV; | |
743 | ||
744 | spin_lock(&port->write_lock); | |
745 | while (1) { | |
746 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
747 | if (count < c) | |
748 | c = count; | |
749 | if (c <= 0) | |
750 | break; | |
751 | memcpy(circ->buf + circ->head, buf, c); | |
752 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
753 | buf += c; | |
754 | count -= c; | |
755 | ret += c; | |
756 | } | |
757 | spin_unlock(&port->write_lock); | |
758 | ||
759 | if ( !(port->ier & UART_IER_THRI)) { | |
760 | int err = sdio_uart_claim_func(port); | |
761 | if (!err) { | |
762 | sdio_uart_start_tx(port); | |
763 | sdio_uart_irq(port->func); | |
764 | sdio_uart_release_func(port); | |
765 | } else | |
766 | ret = err; | |
767 | } | |
768 | ||
769 | return ret; | |
770 | } | |
771 | ||
772 | static int sdio_uart_write_room(struct tty_struct *tty) | |
773 | { | |
774 | struct sdio_uart_port *port = tty->driver_data; | |
775 | return port ? circ_chars_free(&port->xmit) : 0; | |
776 | } | |
777 | ||
778 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
779 | { | |
780 | struct sdio_uart_port *port = tty->driver_data; | |
781 | return port ? circ_chars_pending(&port->xmit) : 0; | |
782 | } | |
783 | ||
784 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
785 | { | |
786 | struct sdio_uart_port *port = tty->driver_data; | |
787 | ||
788 | port->x_char = ch; | |
789 | if (ch && !(port->ier & UART_IER_THRI)) { | |
790 | if (sdio_uart_claim_func(port) != 0) | |
791 | return; | |
792 | sdio_uart_start_tx(port); | |
793 | sdio_uart_irq(port->func); | |
794 | sdio_uart_release_func(port); | |
795 | } | |
796 | } | |
797 | ||
798 | static void sdio_uart_throttle(struct tty_struct *tty) | |
799 | { | |
800 | struct sdio_uart_port *port = tty->driver_data; | |
801 | ||
802 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
803 | return; | |
804 | ||
805 | if (sdio_uart_claim_func(port) != 0) | |
806 | return; | |
807 | ||
808 | if (I_IXOFF(tty)) { | |
809 | port->x_char = STOP_CHAR(tty); | |
810 | sdio_uart_start_tx(port); | |
811 | } | |
812 | ||
813 | if (tty->termios->c_cflag & CRTSCTS) | |
814 | sdio_uart_clear_mctrl(port, TIOCM_RTS); | |
815 | ||
816 | sdio_uart_irq(port->func); | |
817 | sdio_uart_release_func(port); | |
818 | } | |
819 | ||
820 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
821 | { | |
822 | struct sdio_uart_port *port = tty->driver_data; | |
823 | ||
824 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
825 | return; | |
826 | ||
827 | if (sdio_uart_claim_func(port) != 0) | |
828 | return; | |
829 | ||
830 | if (I_IXOFF(tty)) { | |
831 | if (port->x_char) { | |
832 | port->x_char = 0; | |
833 | } else { | |
834 | port->x_char = START_CHAR(tty); | |
835 | sdio_uart_start_tx(port); | |
836 | } | |
837 | } | |
838 | ||
839 | if (tty->termios->c_cflag & CRTSCTS) | |
840 | sdio_uart_set_mctrl(port, TIOCM_RTS); | |
841 | ||
842 | sdio_uart_irq(port->func); | |
843 | sdio_uart_release_func(port); | |
844 | } | |
845 | ||
846 | static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios) | |
847 | { | |
848 | struct sdio_uart_port *port = tty->driver_data; | |
849 | unsigned int cflag = tty->termios->c_cflag; | |
850 | ||
1e04b7ae | 851 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
6e418a9d NP |
852 | |
853 | if ((cflag ^ old_termios->c_cflag) == 0 && | |
854 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) | |
855 | return; | |
856 | ||
857 | if (sdio_uart_claim_func(port) != 0) | |
858 | return; | |
859 | ||
860 | sdio_uart_change_speed(port, tty->termios, old_termios); | |
861 | ||
862 | /* Handle transition to B0 status */ | |
863 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
864 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
865 | ||
866 | /* Handle transition away from B0 status */ | |
867 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
868 | unsigned int mask = TIOCM_DTR; | |
869 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
870 | mask |= TIOCM_RTS; | |
871 | sdio_uart_set_mctrl(port, mask); | |
872 | } | |
873 | ||
874 | /* Handle turning off CRTSCTS */ | |
875 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
876 | tty->hw_stopped = 0; | |
877 | sdio_uart_start_tx(port); | |
878 | } | |
879 | ||
880 | /* Handle turning on CRTSCTS */ | |
881 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
882 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
883 | tty->hw_stopped = 1; | |
884 | sdio_uart_stop_tx(port); | |
885 | } | |
886 | } | |
887 | ||
888 | sdio_uart_release_func(port); | |
889 | } | |
890 | ||
c43d8636 | 891 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
892 | { |
893 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 894 | int result; |
6e418a9d | 895 | |
c43d8636 DH |
896 | result = sdio_uart_claim_func(port); |
897 | if (result != 0) | |
898 | return result; | |
6e418a9d NP |
899 | |
900 | if (break_state == -1) | |
901 | port->lcr |= UART_LCR_SBC; | |
902 | else | |
903 | port->lcr &= ~UART_LCR_SBC; | |
904 | sdio_out(port, UART_LCR, port->lcr); | |
905 | ||
906 | sdio_uart_release_func(port); | |
c43d8636 | 907 | return 0; |
6e418a9d NP |
908 | } |
909 | ||
910 | static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file) | |
911 | { | |
912 | struct sdio_uart_port *port = tty->driver_data; | |
913 | int result; | |
914 | ||
915 | result = sdio_uart_claim_func(port); | |
916 | if (!result) { | |
917 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
918 | sdio_uart_release_func(port); | |
919 | } | |
920 | ||
921 | return result; | |
922 | } | |
923 | ||
924 | static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file, | |
925 | unsigned int set, unsigned int clear) | |
926 | { | |
927 | struct sdio_uart_port *port = tty->driver_data; | |
928 | int result; | |
929 | ||
1e04b7ae | 930 | result = sdio_uart_claim_func(port); |
6e418a9d NP |
931 | if(!result) { |
932 | sdio_uart_update_mctrl(port, set, clear); | |
933 | sdio_uart_release_func(port); | |
934 | } | |
935 | ||
936 | return result; | |
937 | } | |
938 | ||
201a50ba | 939 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 940 | { |
201a50ba | 941 | int i; |
5ed334a1 | 942 | |
201a50ba | 943 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 944 | "", "", ""); |
201a50ba | 945 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
946 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
947 | if (port) { | |
201a50ba | 948 | seq_printf(m, "%d: uart:SDIO", i); |
5ed334a1 | 949 | if(capable(CAP_SYS_ADMIN)) { |
201a50ba | 950 | seq_printf(m, " tx:%d rx:%d", |
1e04b7ae | 951 | port->icount.tx, port->icount.rx); |
5ed334a1 | 952 | if (port->icount.frame) |
201a50ba | 953 | seq_printf(m, " fe:%d", |
1e04b7ae | 954 | port->icount.frame); |
5ed334a1 | 955 | if (port->icount.parity) |
201a50ba | 956 | seq_printf(m, " pe:%d", |
1e04b7ae | 957 | port->icount.parity); |
5ed334a1 | 958 | if (port->icount.brk) |
201a50ba | 959 | seq_printf(m, " brk:%d", |
1e04b7ae | 960 | port->icount.brk); |
5ed334a1 | 961 | if (port->icount.overrun) |
201a50ba | 962 | seq_printf(m, " oe:%d", |
1e04b7ae | 963 | port->icount.overrun); |
5ed334a1 | 964 | if (port->icount.cts) |
201a50ba | 965 | seq_printf(m, " cts:%d", |
1e04b7ae | 966 | port->icount.cts); |
5ed334a1 | 967 | if (port->icount.dsr) |
201a50ba | 968 | seq_printf(m, " dsr:%d", |
1e04b7ae | 969 | port->icount.dsr); |
5ed334a1 | 970 | if (port->icount.rng) |
201a50ba | 971 | seq_printf(m, " rng:%d", |
1e04b7ae | 972 | port->icount.rng); |
5ed334a1 | 973 | if (port->icount.dcd) |
201a50ba | 974 | seq_printf(m, " dcd:%d", |
1e04b7ae | 975 | port->icount.dcd); |
5ed334a1 | 976 | } |
5ed334a1 | 977 | sdio_uart_port_put(port); |
201a50ba | 978 | seq_putc(m, '\n'); |
5ed334a1 NP |
979 | } |
980 | } | |
201a50ba AD |
981 | return 0; |
982 | } | |
5ed334a1 | 983 | |
201a50ba AD |
984 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
985 | { | |
986 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
987 | } |
988 | ||
201a50ba AD |
989 | static const struct file_operations sdio_uart_proc_fops = { |
990 | .owner = THIS_MODULE, | |
991 | .open = sdio_uart_proc_open, | |
992 | .read = seq_read, | |
993 | .llseek = seq_lseek, | |
994 | .release = single_release, | |
995 | }; | |
996 | ||
6e418a9d NP |
997 | static const struct tty_operations sdio_uart_ops = { |
998 | .open = sdio_uart_open, | |
999 | .close = sdio_uart_close, | |
1000 | .write = sdio_uart_write, | |
1001 | .write_room = sdio_uart_write_room, | |
1002 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1003 | .send_xchar = sdio_uart_send_xchar, | |
1004 | .throttle = sdio_uart_throttle, | |
1005 | .unthrottle = sdio_uart_unthrottle, | |
1006 | .set_termios = sdio_uart_set_termios, | |
1007 | .break_ctl = sdio_uart_break_ctl, | |
1008 | .tiocmget = sdio_uart_tiocmget, | |
1009 | .tiocmset = sdio_uart_tiocmset, | |
201a50ba | 1010 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1011 | }; |
1012 | ||
1013 | static struct tty_driver *sdio_uart_tty_driver; | |
1014 | ||
1015 | static int sdio_uart_probe(struct sdio_func *func, | |
1016 | const struct sdio_device_id *id) | |
1017 | { | |
1018 | struct sdio_uart_port *port; | |
1019 | int ret; | |
1020 | ||
1021 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1022 | if (!port) | |
1023 | return -ENOMEM; | |
1024 | ||
1025 | if (func->class == SDIO_CLASS_UART) { | |
1026 | printk(KERN_WARNING "%s: need info on UART class basic setup\n", | |
1027 | sdio_func_id(func)); | |
1028 | kfree(port); | |
1029 | return -ENOSYS; | |
1030 | } else if (func->class == SDIO_CLASS_GPS) { | |
1031 | /* | |
1032 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1033 | * and SUBTPL_RCVCAPS. | |
1034 | */ | |
1035 | struct sdio_func_tuple *tpl; | |
1036 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1037 | if (tpl->code != 0x91) | |
1038 | continue; | |
1039 | if (tpl->size < 10) | |
1040 | continue; | |
1041 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1042 | break; | |
1043 | } | |
1044 | if (!tpl) { | |
1045 | printk(KERN_WARNING | |
1046 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", | |
1047 | sdio_func_id(func)); | |
1048 | kfree(port); | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", | |
1052 | sdio_func_id(func), tpl->data[2], tpl->data[3]); | |
1053 | port->regs_offset = (tpl->data[4] << 0) | | |
1054 | (tpl->data[5] << 8) | | |
1055 | (tpl->data[6] << 16); | |
1056 | printk(KERN_DEBUG "%s: regs offset = 0x%x\n", | |
1057 | sdio_func_id(func), port->regs_offset); | |
1058 | port->uartclk = tpl->data[7] * 115200; | |
1059 | if (port->uartclk == 0) | |
1060 | port->uartclk = 115200; | |
1061 | printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n", | |
1062 | sdio_func_id(func), port->uartclk, | |
1063 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1064 | } else { | |
1065 | kfree(port); | |
1066 | return -EINVAL; | |
1067 | } | |
1068 | ||
1069 | port->func = func; | |
1070 | sdio_set_drvdata(func, port); | |
1071 | ||
1072 | ret = sdio_uart_add_port(port); | |
1073 | if (ret) { | |
1074 | kfree(port); | |
1075 | } else { | |
1076 | struct device *dev; | |
1077 | dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev); | |
1078 | if (IS_ERR(dev)) { | |
1079 | sdio_uart_port_remove(port); | |
1080 | ret = PTR_ERR(dev); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | static void sdio_uart_remove(struct sdio_func *func) | |
1088 | { | |
1089 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1090 | ||
1091 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1092 | sdio_uart_port_remove(port); | |
1093 | } | |
1094 | ||
1095 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1096 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1097 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1098 | { /* end: all zeroes */ }, | |
1099 | }; | |
1100 | ||
1101 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1102 | ||
1103 | static struct sdio_driver sdio_uart_driver = { | |
1104 | .probe = sdio_uart_probe, | |
1105 | .remove = sdio_uart_remove, | |
1106 | .name = "sdio_uart", | |
1107 | .id_table = sdio_uart_ids, | |
1108 | }; | |
1109 | ||
1110 | static int __init sdio_uart_init(void) | |
1111 | { | |
1112 | int ret; | |
1113 | struct tty_driver *tty_drv; | |
1114 | ||
1115 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1116 | if (!tty_drv) | |
1117 | return -ENOMEM; | |
1118 | ||
1119 | tty_drv->owner = THIS_MODULE; | |
1120 | tty_drv->driver_name = "sdio_uart"; | |
1121 | tty_drv->name = "ttySDIO"; | |
1122 | tty_drv->major = 0; /* dynamically allocated */ | |
1123 | tty_drv->minor_start = 0; | |
1124 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1125 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1126 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1127 | tty_drv->init_termios = tty_std_termios; | |
1128 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1129 | tty_drv->init_termios.c_ispeed = 4800; |
1130 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1131 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1132 | ||
1133 | ret = tty_register_driver(tty_drv); | |
1134 | if (ret) | |
1135 | goto err1; | |
1136 | ||
1137 | ret = sdio_register_driver(&sdio_uart_driver); | |
1138 | if (ret) | |
1139 | goto err2; | |
1140 | ||
1141 | return 0; | |
1142 | ||
1143 | err2: | |
1144 | tty_unregister_driver(tty_drv); | |
1145 | err1: | |
1146 | put_tty_driver(tty_drv); | |
1147 | return ret; | |
1148 | } | |
1149 | ||
1150 | static void __exit sdio_uart_exit(void) | |
1151 | { | |
1152 | sdio_unregister_driver(&sdio_uart_driver); | |
1153 | tty_unregister_driver(sdio_uart_tty_driver); | |
1154 | put_tty_driver(sdio_uart_tty_driver); | |
1155 | } | |
1156 | ||
1157 | module_init(sdio_uart_init); | |
1158 | module_exit(sdio_uart_exit); | |
1159 | ||
1160 | MODULE_AUTHOR("Nicolas Pitre"); | |
1161 | MODULE_LICENSE("GPL"); |