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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> | |
4b3b49bb | 32 | #include <linux/sched.h> |
6e418a9d | 33 | #include <linux/mutex.h> |
201a50ba | 34 | #include <linux/seq_file.h> |
6e418a9d NP |
35 | #include <linux/serial_reg.h> |
36 | #include <linux/circ_buf.h> | |
37 | #include <linux/gfp.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/tty_flip.h> | |
40 | ||
41 | #include <linux/mmc/core.h> | |
42 | #include <linux/mmc/card.h> | |
43 | #include <linux/mmc/sdio_func.h> | |
44 | #include <linux/mmc/sdio_ids.h> | |
45 | ||
46 | ||
47 | #define UART_NR 8 /* Number of UARTs this driver can handle */ | |
48 | ||
49 | ||
50 | #define UART_XMIT_SIZE PAGE_SIZE | |
51 | #define WAKEUP_CHARS 256 | |
52 | ||
53 | #define circ_empty(circ) ((circ)->head == (circ)->tail) | |
54 | #define circ_clear(circ) ((circ)->head = (circ)->tail = 0) | |
55 | ||
56 | #define circ_chars_pending(circ) \ | |
57 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
58 | ||
59 | #define circ_chars_free(circ) \ | |
60 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
61 | ||
62 | ||
63 | struct uart_icount { | |
64 | __u32 cts; | |
65 | __u32 dsr; | |
66 | __u32 rng; | |
67 | __u32 dcd; | |
68 | __u32 rx; | |
69 | __u32 tx; | |
70 | __u32 frame; | |
71 | __u32 overrun; | |
72 | __u32 parity; | |
73 | __u32 brk; | |
74 | }; | |
75 | ||
76 | struct sdio_uart_port { | |
b5849b1a | 77 | struct tty_port port; |
6e418a9d NP |
78 | struct kref kref; |
79 | struct tty_struct *tty; | |
80 | unsigned int index; | |
6e418a9d NP |
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; | |
4b3b49bb | 90 | unsigned int rx_mctrl; |
6e418a9d NP |
91 | unsigned int read_status_mask; |
92 | unsigned int ignore_status_mask; | |
93 | unsigned char x_char; | |
94 | unsigned char ier; | |
95 | unsigned char lcr; | |
96 | }; | |
97 | ||
98 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
99 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
100 | ||
101 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
102 | { | |
103 | int index, ret = -EBUSY; | |
104 | ||
105 | kref_init(&port->kref); | |
6e418a9d NP |
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; | |
584abc37 | 154 | struct tty_struct *tty; |
6e418a9d NP |
155 | |
156 | BUG_ON(sdio_uart_table[port->index] != port); | |
157 | ||
158 | spin_lock(&sdio_uart_table_lock); | |
159 | sdio_uart_table[port->index] = NULL; | |
160 | spin_unlock(&sdio_uart_table_lock); | |
161 | ||
162 | /* | |
163 | * We're killing a port that potentially still is in use by | |
164 | * the tty layer. Be careful to prevent any further access | |
165 | * to the SDIO function and arrange for the tty layer to | |
166 | * give up on that port ASAP. | |
167 | * Beware: the lock ordering is critical. | |
168 | */ | |
0a68f64f | 169 | mutex_lock(&port->port.mutex); |
6e418a9d NP |
170 | mutex_lock(&port->func_lock); |
171 | func = port->func; | |
172 | sdio_claim_host(func); | |
173 | port->func = NULL; | |
174 | mutex_unlock(&port->func_lock); | |
584abc37 AC |
175 | tty = tty_port_tty_get(&port->port); |
176 | /* tty_hangup is async so is this safe as is ?? */ | |
177 | if (tty) { | |
178 | tty_hangup(tty); | |
530646f4 AC |
179 | tty_kref_put(tty); |
180 | } | |
0a68f64f | 181 | mutex_unlock(&port->port.mutex); |
6e418a9d NP |
182 | sdio_release_irq(func); |
183 | sdio_disable_func(func); | |
184 | sdio_release_host(func); | |
185 | ||
186 | sdio_uart_port_put(port); | |
187 | } | |
188 | ||
189 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
190 | { | |
191 | mutex_lock(&port->func_lock); | |
192 | if (unlikely(!port->func)) { | |
193 | mutex_unlock(&port->func_lock); | |
194 | return -ENODEV; | |
195 | } | |
15b82b46 NP |
196 | if (likely(port->in_sdio_uart_irq != current)) |
197 | sdio_claim_host(port->func); | |
6e418a9d NP |
198 | mutex_unlock(&port->func_lock); |
199 | return 0; | |
200 | } | |
201 | ||
202 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
203 | { | |
15b82b46 NP |
204 | if (likely(port->in_sdio_uart_irq != current)) |
205 | sdio_release_host(port->func); | |
6e418a9d NP |
206 | } |
207 | ||
208 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
209 | { | |
210 | unsigned char c; | |
211 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
212 | return c; | |
213 | } | |
214 | ||
215 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
216 | { | |
217 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
218 | } | |
219 | ||
220 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
221 | { | |
222 | unsigned char status; | |
223 | unsigned int ret; | |
224 | ||
4b3b49bb AC |
225 | /* FIXME: What stops this losing the delta bits and breaking |
226 | sdio_uart_check_modem_status ? */ | |
6e418a9d NP |
227 | status = sdio_in(port, UART_MSR); |
228 | ||
229 | ret = 0; | |
230 | if (status & UART_MSR_DCD) | |
231 | ret |= TIOCM_CAR; | |
232 | if (status & UART_MSR_RI) | |
233 | ret |= TIOCM_RNG; | |
234 | if (status & UART_MSR_DSR) | |
235 | ret |= TIOCM_DSR; | |
236 | if (status & UART_MSR_CTS) | |
237 | ret |= TIOCM_CTS; | |
238 | return ret; | |
239 | } | |
240 | ||
1e04b7ae TLSC |
241 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, |
242 | unsigned int mctrl) | |
6e418a9d NP |
243 | { |
244 | unsigned char mcr = 0; | |
245 | ||
246 | if (mctrl & TIOCM_RTS) | |
247 | mcr |= UART_MCR_RTS; | |
248 | if (mctrl & TIOCM_DTR) | |
249 | mcr |= UART_MCR_DTR; | |
250 | if (mctrl & TIOCM_OUT1) | |
251 | mcr |= UART_MCR_OUT1; | |
252 | if (mctrl & TIOCM_OUT2) | |
253 | mcr |= UART_MCR_OUT2; | |
254 | if (mctrl & TIOCM_LOOP) | |
255 | mcr |= UART_MCR_LOOP; | |
256 | ||
257 | sdio_out(port, UART_MCR, mcr); | |
258 | } | |
259 | ||
260 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
261 | unsigned int set, unsigned int clear) | |
262 | { | |
263 | unsigned int old; | |
264 | ||
265 | old = port->mctrl; | |
266 | port->mctrl = (old & ~clear) | set; | |
267 | if (old != port->mctrl) | |
268 | sdio_uart_write_mctrl(port, port->mctrl); | |
269 | } | |
270 | ||
271 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
272 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
273 | ||
274 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
275 | struct ktermios *termios, | |
276 | struct ktermios *old) | |
277 | { | |
278 | unsigned char cval, fcr = 0; | |
279 | unsigned int baud, quot; | |
280 | ||
281 | switch (termios->c_cflag & CSIZE) { | |
282 | case CS5: | |
283 | cval = UART_LCR_WLEN5; | |
284 | break; | |
285 | case CS6: | |
286 | cval = UART_LCR_WLEN6; | |
287 | break; | |
288 | case CS7: | |
289 | cval = UART_LCR_WLEN7; | |
290 | break; | |
291 | default: | |
292 | case CS8: | |
293 | cval = UART_LCR_WLEN8; | |
294 | break; | |
295 | } | |
296 | ||
297 | if (termios->c_cflag & CSTOPB) | |
298 | cval |= UART_LCR_STOP; | |
299 | if (termios->c_cflag & PARENB) | |
300 | cval |= UART_LCR_PARITY; | |
301 | if (!(termios->c_cflag & PARODD)) | |
302 | cval |= UART_LCR_EPAR; | |
303 | ||
304 | for (;;) { | |
305 | baud = tty_termios_baud_rate(termios); | |
306 | if (baud == 0) | |
307 | baud = 9600; /* Special case: B0 rate. */ | |
308 | if (baud <= port->uartclk) | |
309 | break; | |
310 | /* | |
311 | * Oops, the quotient was zero. Try again with the old | |
312 | * baud rate if possible, otherwise default to 9600. | |
313 | */ | |
314 | termios->c_cflag &= ~CBAUD; | |
315 | if (old) { | |
316 | termios->c_cflag |= old->c_cflag & CBAUD; | |
317 | old = NULL; | |
318 | } else | |
319 | termios->c_cflag |= B9600; | |
320 | } | |
321 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
322 | ||
323 | if (baud < 2400) | |
324 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
325 | else | |
326 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
327 | ||
328 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
329 | if (termios->c_iflag & INPCK) | |
330 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
331 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
332 | port->read_status_mask |= UART_LSR_BI; | |
333 | ||
334 | /* | |
335 | * Characters to ignore | |
336 | */ | |
337 | port->ignore_status_mask = 0; | |
338 | if (termios->c_iflag & IGNPAR) | |
339 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
340 | if (termios->c_iflag & IGNBRK) { | |
341 | port->ignore_status_mask |= UART_LSR_BI; | |
342 | /* | |
343 | * If we're ignoring parity and break indicators, | |
344 | * ignore overruns too (for real raw support). | |
345 | */ | |
346 | if (termios->c_iflag & IGNPAR) | |
347 | port->ignore_status_mask |= UART_LSR_OE; | |
348 | } | |
349 | ||
350 | /* | |
351 | * ignore all characters if CREAD is not set | |
352 | */ | |
353 | if ((termios->c_cflag & CREAD) == 0) | |
354 | port->ignore_status_mask |= UART_LSR_DR; | |
355 | ||
356 | /* | |
357 | * CTS flow control flag and modem status interrupts | |
358 | */ | |
359 | port->ier &= ~UART_IER_MSI; | |
360 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
361 | port->ier |= UART_IER_MSI; | |
362 | ||
363 | port->lcr = cval; | |
364 | ||
365 | sdio_out(port, UART_IER, port->ier); | |
366 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
367 | sdio_out(port, UART_DLL, quot & 0xff); | |
368 | sdio_out(port, UART_DLM, quot >> 8); | |
369 | sdio_out(port, UART_LCR, cval); | |
370 | sdio_out(port, UART_FCR, fcr); | |
371 | ||
372 | sdio_uart_write_mctrl(port, port->mctrl); | |
373 | } | |
374 | ||
375 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
376 | { | |
377 | if (!(port->ier & UART_IER_THRI)) { | |
378 | port->ier |= UART_IER_THRI; | |
379 | sdio_out(port, UART_IER, port->ier); | |
380 | } | |
381 | } | |
382 | ||
383 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
384 | { | |
385 | if (port->ier & UART_IER_THRI) { | |
386 | port->ier &= ~UART_IER_THRI; | |
387 | sdio_out(port, UART_IER, port->ier); | |
388 | } | |
389 | } | |
390 | ||
391 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
392 | { | |
393 | port->ier &= ~UART_IER_RLSI; | |
394 | port->read_status_mask &= ~UART_LSR_DR; | |
395 | sdio_out(port, UART_IER, port->ier); | |
396 | } | |
397 | ||
1e04b7ae TLSC |
398 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, |
399 | unsigned int *status) | |
6e418a9d | 400 | { |
530646f4 | 401 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
6e418a9d NP |
402 | unsigned int ch, flag; |
403 | int max_count = 256; | |
404 | ||
405 | do { | |
406 | ch = sdio_in(port, UART_RX); | |
407 | flag = TTY_NORMAL; | |
408 | port->icount.rx++; | |
409 | ||
410 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
1e04b7ae | 411 | UART_LSR_FE | UART_LSR_OE))) { |
6e418a9d NP |
412 | /* |
413 | * For statistics only | |
414 | */ | |
415 | if (*status & UART_LSR_BI) { | |
416 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
417 | port->icount.brk++; | |
418 | } else if (*status & UART_LSR_PE) | |
419 | port->icount.parity++; | |
420 | else if (*status & UART_LSR_FE) | |
421 | port->icount.frame++; | |
422 | if (*status & UART_LSR_OE) | |
423 | port->icount.overrun++; | |
424 | ||
425 | /* | |
426 | * Mask off conditions which should be ignored. | |
427 | */ | |
428 | *status &= port->read_status_mask; | |
1e04b7ae | 429 | if (*status & UART_LSR_BI) |
6e418a9d | 430 | flag = TTY_BREAK; |
1e04b7ae | 431 | else if (*status & UART_LSR_PE) |
6e418a9d NP |
432 | flag = TTY_PARITY; |
433 | else if (*status & UART_LSR_FE) | |
434 | flag = TTY_FRAME; | |
435 | } | |
436 | ||
437 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
530646f4 AC |
438 | if (tty) |
439 | tty_insert_flip_char(tty, ch, flag); | |
6e418a9d NP |
440 | |
441 | /* | |
442 | * Overrun is special. Since it's reported immediately, | |
443 | * it doesn't affect the current character. | |
444 | */ | |
445 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
530646f4 AC |
446 | if (tty) |
447 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
6e418a9d NP |
448 | |
449 | *status = sdio_in(port, UART_LSR); | |
450 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
530646f4 AC |
451 | if (tty) { |
452 | tty_flip_buffer_push(tty); | |
453 | tty_kref_put(tty); | |
454 | } | |
6e418a9d NP |
455 | } |
456 | ||
457 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
458 | { | |
459 | struct circ_buf *xmit = &port->xmit; | |
460 | int count; | |
530646f4 | 461 | struct tty_struct *tty; |
6e418a9d NP |
462 | |
463 | if (port->x_char) { | |
464 | sdio_out(port, UART_TX, port->x_char); | |
465 | port->icount.tx++; | |
466 | port->x_char = 0; | |
467 | return; | |
468 | } | |
530646f4 AC |
469 | |
470 | tty = tty_port_tty_get(&port->port); | |
471 | ||
c271cf37 AC |
472 | if (tty == NULL || circ_empty(xmit) || |
473 | tty->stopped || tty->hw_stopped) { | |
6e418a9d | 474 | sdio_uart_stop_tx(port); |
530646f4 | 475 | tty_kref_put(tty); |
6e418a9d NP |
476 | return; |
477 | } | |
478 | ||
479 | count = 16; | |
480 | do { | |
481 | sdio_out(port, UART_TX, xmit->buf[xmit->tail]); | |
482 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
483 | port->icount.tx++; | |
484 | if (circ_empty(xmit)) | |
485 | break; | |
486 | } while (--count > 0); | |
487 | ||
488 | if (circ_chars_pending(xmit) < WAKEUP_CHARS) | |
b5849b1a | 489 | tty_wakeup(tty); |
6e418a9d NP |
490 | |
491 | if (circ_empty(xmit)) | |
492 | sdio_uart_stop_tx(port); | |
530646f4 | 493 | tty_kref_put(tty); |
6e418a9d NP |
494 | } |
495 | ||
496 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
497 | { | |
498 | int status; | |
530646f4 | 499 | struct tty_struct *tty; |
6e418a9d NP |
500 | |
501 | status = sdio_in(port, UART_MSR); | |
502 | ||
503 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
504 | return; | |
505 | ||
506 | if (status & UART_MSR_TERI) | |
507 | port->icount.rng++; | |
508 | if (status & UART_MSR_DDSR) | |
509 | port->icount.dsr++; | |
4b3b49bb | 510 | if (status & UART_MSR_DDCD) { |
6e418a9d | 511 | port->icount.dcd++; |
4b3b49bb AC |
512 | /* DCD raise - wake for open */ |
513 | if (status & UART_MSR_DCD) | |
514 | wake_up_interruptible(&port->port.open_wait); | |
515 | else { | |
516 | /* DCD drop - hang up if tty attached */ | |
517 | tty = tty_port_tty_get(&port->port); | |
518 | if (tty) { | |
519 | tty_hangup(tty); | |
520 | tty_kref_put(tty); | |
521 | } | |
522 | } | |
523 | } | |
6e418a9d NP |
524 | if (status & UART_MSR_DCTS) { |
525 | port->icount.cts++; | |
530646f4 AC |
526 | tty = tty_port_tty_get(&port->port); |
527 | if (tty && (tty->termios->c_cflag & CRTSCTS)) { | |
6e418a9d | 528 | int cts = (status & UART_MSR_CTS); |
b5849b1a | 529 | if (tty->hw_stopped) { |
6e418a9d | 530 | if (cts) { |
b5849b1a | 531 | tty->hw_stopped = 0; |
6e418a9d | 532 | sdio_uart_start_tx(port); |
b5849b1a | 533 | tty_wakeup(tty); |
6e418a9d NP |
534 | } |
535 | } else { | |
536 | if (!cts) { | |
b5849b1a | 537 | tty->hw_stopped = 1; |
6e418a9d NP |
538 | sdio_uart_stop_tx(port); |
539 | } | |
540 | } | |
541 | } | |
530646f4 | 542 | tty_kref_put(tty); |
6e418a9d NP |
543 | } |
544 | } | |
545 | ||
546 | /* | |
547 | * This handles the interrupt from one port. | |
548 | */ | |
549 | static void sdio_uart_irq(struct sdio_func *func) | |
550 | { | |
551 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
552 | unsigned int iir, lsr; | |
553 | ||
15b82b46 NP |
554 | /* |
555 | * In a few places sdio_uart_irq() is called directly instead of | |
556 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
557 | * thread scheduled in order to reduce latency. However, some | |
558 | * interaction with the tty core may end up calling us back | |
559 | * (serial echo, flow control, etc.) through those same places | |
560 | * causing undesirable effects. Let's stop the recursion here. | |
561 | */ | |
562 | if (unlikely(port->in_sdio_uart_irq == current)) | |
563 | return; | |
564 | ||
6e418a9d NP |
565 | iir = sdio_in(port, UART_IIR); |
566 | if (iir & UART_IIR_NO_INT) | |
567 | return; | |
15b82b46 NP |
568 | |
569 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
570 | lsr = sdio_in(port, UART_LSR); |
571 | if (lsr & UART_LSR_DR) | |
572 | sdio_uart_receive_chars(port, &lsr); | |
573 | sdio_uart_check_modem_status(port); | |
574 | if (lsr & UART_LSR_THRE) | |
575 | sdio_uart_transmit_chars(port); | |
15b82b46 | 576 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
577 | } |
578 | ||
4b3b49bb AC |
579 | static int uart_carrier_raised(struct tty_port *tport) |
580 | { | |
581 | struct sdio_uart_port *port = | |
582 | container_of(tport, struct sdio_uart_port, port); | |
583 | unsigned int ret = sdio_uart_claim_func(port); | |
584 | if (ret) /* Missing hardware shoudn't block for carrier */ | |
585 | return 1; | |
586 | ret = sdio_uart_get_mctrl(port); | |
587 | sdio_uart_release_func(port); | |
588 | if (ret & TIOCM_CAR) | |
589 | return 1; | |
590 | return 0; | |
591 | } | |
592 | ||
584abc37 AC |
593 | /** |
594 | * uart_dtr_rts - port helper to set uart signals | |
595 | * @tport: tty port to be updated | |
596 | * @onoff: set to turn on DTR/RTS | |
597 | * | |
598 | * Called by the tty port helpers when the modem signals need to be | |
599 | * adjusted during an open, close and hangup. | |
600 | */ | |
601 | ||
602 | static void uart_dtr_rts(struct tty_port *tport, int onoff) | |
6e418a9d | 603 | { |
584abc37 AC |
604 | struct sdio_uart_port *port = |
605 | container_of(tport, struct sdio_uart_port, port); | |
1f100b32 AC |
606 | int ret = sdio_uart_claim_func(port); |
607 | if (ret) | |
608 | return; | |
584abc37 AC |
609 | if (onoff == 0) |
610 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
611 | else | |
612 | sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1f100b32 | 613 | sdio_uart_release_func(port); |
584abc37 | 614 | } |
530646f4 | 615 | |
584abc37 AC |
616 | /** |
617 | * sdio_uart_activate - start up hardware | |
618 | * @tport: tty port to activate | |
619 | * @tty: tty bound to this port | |
620 | * | |
621 | * Activate a tty port. The port locking guarantees us this will be | |
622 | * run exactly once per set of opens, and if successful will see the | |
623 | * shutdown method run exactly once to match. Start up and shutdown are | |
624 | * protected from each other by the internal locking and will not run | |
625 | * at the same time even during a hangup event. | |
626 | * | |
627 | * If we successfully start up the port we take an extra kref as we | |
628 | * will keep it around until shutdown when the kref is dropped. | |
629 | */ | |
630 | ||
631 | static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty) | |
632 | { | |
633 | struct sdio_uart_port *port = | |
634 | container_of(tport, struct sdio_uart_port, port); | |
635 | unsigned long page; | |
636 | int ret; | |
6e418a9d NP |
637 | |
638 | /* | |
639 | * Set the TTY IO error marker - we will only clear this | |
640 | * once we have successfully opened the port. | |
641 | */ | |
b5849b1a | 642 | set_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
643 | |
644 | /* Initialise and allocate the transmit buffer. */ | |
645 | page = __get_free_page(GFP_KERNEL); | |
646 | if (!page) | |
584abc37 | 647 | return -ENOMEM; |
6e418a9d NP |
648 | port->xmit.buf = (unsigned char *)page; |
649 | circ_clear(&port->xmit); | |
650 | ||
651 | ret = sdio_uart_claim_func(port); | |
652 | if (ret) | |
653 | goto err1; | |
654 | ret = sdio_enable_func(port->func); | |
655 | if (ret) | |
656 | goto err2; | |
657 | ret = sdio_claim_irq(port->func, sdio_uart_irq); | |
658 | if (ret) | |
659 | goto err3; | |
660 | ||
661 | /* | |
662 | * Clear the FIFO buffers and disable them. | |
663 | * (they will be reenabled in sdio_change_speed()) | |
664 | */ | |
665 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
666 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1e04b7ae | 667 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
6e418a9d NP |
668 | sdio_out(port, UART_FCR, 0); |
669 | ||
670 | /* | |
671 | * Clear the interrupt registers. | |
672 | */ | |
673 | (void) sdio_in(port, UART_LSR); | |
674 | (void) sdio_in(port, UART_RX); | |
675 | (void) sdio_in(port, UART_IIR); | |
676 | (void) sdio_in(port, UART_MSR); | |
677 | ||
678 | /* | |
679 | * Now, initialize the UART | |
680 | */ | |
681 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
682 | ||
c271cf37 | 683 | port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE; |
6e418a9d NP |
684 | port->mctrl = TIOCM_OUT2; |
685 | ||
b5849b1a | 686 | sdio_uart_change_speed(port, tty->termios, NULL); |
6e418a9d | 687 | |
b5849b1a | 688 | if (tty->termios->c_cflag & CBAUD) |
6e418a9d NP |
689 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); |
690 | ||
b5849b1a | 691 | if (tty->termios->c_cflag & CRTSCTS) |
6e418a9d | 692 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) |
b5849b1a | 693 | tty->hw_stopped = 1; |
6e418a9d | 694 | |
0395b48c | 695 | clear_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
696 | |
697 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
698 | sdio_uart_irq(port->func); | |
699 | ||
700 | sdio_uart_release_func(port); | |
701 | return 0; | |
702 | ||
703 | err3: | |
704 | sdio_disable_func(port->func); | |
705 | err2: | |
706 | sdio_uart_release_func(port); | |
707 | err1: | |
708 | free_page((unsigned long)port->xmit.buf); | |
709 | return ret; | |
710 | } | |
711 | ||
584abc37 AC |
712 | /** |
713 | * sdio_uart_shutdown - stop hardware | |
714 | * @tport: tty port to shut down | |
715 | * | |
716 | * Deactivate a tty port. The port locking guarantees us this will be | |
717 | * run only if a successful matching activate already ran. The two are | |
718 | * protected from each other by the internal locking and will not run | |
719 | * at the same time even during a hangup event. | |
720 | */ | |
721 | ||
722 | static void sdio_uart_shutdown(struct tty_port *tport) | |
6e418a9d | 723 | { |
584abc37 AC |
724 | struct sdio_uart_port *port = |
725 | container_of(tport, struct sdio_uart_port, port); | |
6e418a9d NP |
726 | int ret; |
727 | ||
728 | ret = sdio_uart_claim_func(port); | |
729 | if (ret) | |
730 | goto skip; | |
731 | ||
732 | sdio_uart_stop_rx(port); | |
733 | ||
1e04b7ae | 734 | /* Disable interrupts from this port */ |
6e418a9d NP |
735 | sdio_release_irq(port->func); |
736 | port->ier = 0; | |
737 | sdio_out(port, UART_IER, 0); | |
738 | ||
739 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
740 | ||
741 | /* Disable break condition and FIFOs. */ | |
742 | port->lcr &= ~UART_LCR_SBC; | |
743 | sdio_out(port, UART_LCR, port->lcr); | |
744 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
745 | UART_FCR_CLEAR_RCVR | | |
746 | UART_FCR_CLEAR_XMIT); | |
747 | sdio_out(port, UART_FCR, 0); | |
748 | ||
749 | sdio_disable_func(port->func); | |
750 | ||
751 | sdio_uart_release_func(port); | |
752 | ||
753 | skip: | |
754 | /* Free the transmit buffer page. */ | |
755 | free_page((unsigned long)port->xmit.buf); | |
756 | } | |
757 | ||
584abc37 AC |
758 | /** |
759 | * sdio_uart_install - install method | |
760 | * @driver: the driver in use (sdio_uart in our case) | |
761 | * @tty: the tty being bound | |
762 | * | |
763 | * Look up and bind the tty and the driver together. Initialize | |
764 | * any needed private data (in our case the termios) | |
765 | */ | |
6e418a9d | 766 | |
584abc37 AC |
767 | static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty) |
768 | { | |
769 | int idx = tty->index; | |
770 | struct sdio_uart_port *port = sdio_uart_port_get(idx); | |
771 | int ret = tty_init_termios(tty); | |
772 | ||
773 | if (ret == 0) { | |
774 | tty_driver_kref_get(driver); | |
775 | tty->count++; | |
776 | /* This is the ref sdio_uart_port get provided */ | |
777 | tty->driver_data = port; | |
778 | driver->ttys[idx] = tty; | |
779 | } else | |
6e418a9d | 780 | sdio_uart_port_put(port); |
584abc37 | 781 | return ret; |
6e418a9d NP |
782 | } |
783 | ||
584abc37 AC |
784 | /** |
785 | * sdio_uart_cleanup - called on the last tty kref drop | |
786 | * @tty: the tty being destroyed | |
787 | * | |
788 | * Called asynchronously when the last reference to the tty is dropped. | |
789 | * We cannot destroy the tty->driver_data port kref until this point | |
790 | */ | |
791 | ||
792 | static void sdio_uart_cleanup(struct tty_struct *tty) | |
6e418a9d NP |
793 | { |
794 | struct sdio_uart_port *port = tty->driver_data; | |
584abc37 AC |
795 | tty->driver_data = NULL; /* Bug trap */ |
796 | sdio_uart_port_put(port); | |
797 | } | |
6e418a9d | 798 | |
584abc37 AC |
799 | /* |
800 | * Open/close/hangup is now entirely boilerplate | |
801 | */ | |
6e418a9d | 802 | |
584abc37 AC |
803 | static int sdio_uart_open(struct tty_struct *tty, struct file *filp) |
804 | { | |
805 | struct sdio_uart_port *port = tty->driver_data; | |
806 | return tty_port_open(&port->port, tty, filp); | |
807 | } | |
6e418a9d | 808 | |
584abc37 AC |
809 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) |
810 | { | |
811 | struct sdio_uart_port *port = tty->driver_data; | |
812 | tty_port_close(&port->port, tty, filp); | |
813 | } | |
6e418a9d | 814 | |
584abc37 AC |
815 | static void sdio_uart_hangup(struct tty_struct *tty) |
816 | { | |
817 | struct sdio_uart_port *port = tty->driver_data; | |
818 | tty_port_hangup(&port->port); | |
6e418a9d NP |
819 | } |
820 | ||
c271cf37 | 821 | static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf, |
6e418a9d NP |
822 | int count) |
823 | { | |
824 | struct sdio_uart_port *port = tty->driver_data; | |
825 | struct circ_buf *circ = &port->xmit; | |
826 | int c, ret = 0; | |
827 | ||
828 | if (!port->func) | |
829 | return -ENODEV; | |
830 | ||
831 | spin_lock(&port->write_lock); | |
832 | while (1) { | |
833 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
834 | if (count < c) | |
835 | c = count; | |
836 | if (c <= 0) | |
837 | break; | |
838 | memcpy(circ->buf + circ->head, buf, c); | |
839 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
840 | buf += c; | |
841 | count -= c; | |
842 | ret += c; | |
843 | } | |
844 | spin_unlock(&port->write_lock); | |
845 | ||
c271cf37 | 846 | if (!(port->ier & UART_IER_THRI)) { |
6e418a9d NP |
847 | int err = sdio_uart_claim_func(port); |
848 | if (!err) { | |
849 | sdio_uart_start_tx(port); | |
850 | sdio_uart_irq(port->func); | |
851 | sdio_uart_release_func(port); | |
852 | } else | |
853 | ret = err; | |
854 | } | |
855 | ||
856 | return ret; | |
857 | } | |
858 | ||
859 | static int sdio_uart_write_room(struct tty_struct *tty) | |
860 | { | |
861 | struct sdio_uart_port *port = tty->driver_data; | |
862 | return port ? circ_chars_free(&port->xmit) : 0; | |
863 | } | |
864 | ||
865 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
866 | { | |
867 | struct sdio_uart_port *port = tty->driver_data; | |
868 | return port ? circ_chars_pending(&port->xmit) : 0; | |
869 | } | |
870 | ||
871 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
872 | { | |
873 | struct sdio_uart_port *port = tty->driver_data; | |
874 | ||
875 | port->x_char = ch; | |
876 | if (ch && !(port->ier & UART_IER_THRI)) { | |
877 | if (sdio_uart_claim_func(port) != 0) | |
878 | return; | |
879 | sdio_uart_start_tx(port); | |
880 | sdio_uart_irq(port->func); | |
881 | sdio_uart_release_func(port); | |
882 | } | |
883 | } | |
884 | ||
885 | static void sdio_uart_throttle(struct tty_struct *tty) | |
886 | { | |
887 | struct sdio_uart_port *port = tty->driver_data; | |
888 | ||
889 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
890 | return; | |
891 | ||
892 | if (sdio_uart_claim_func(port) != 0) | |
893 | return; | |
894 | ||
895 | if (I_IXOFF(tty)) { | |
896 | port->x_char = STOP_CHAR(tty); | |
897 | sdio_uart_start_tx(port); | |
898 | } | |
899 | ||
900 | if (tty->termios->c_cflag & CRTSCTS) | |
901 | sdio_uart_clear_mctrl(port, TIOCM_RTS); | |
902 | ||
903 | sdio_uart_irq(port->func); | |
904 | sdio_uart_release_func(port); | |
905 | } | |
906 | ||
907 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
908 | { | |
909 | struct sdio_uart_port *port = tty->driver_data; | |
910 | ||
911 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
912 | return; | |
913 | ||
914 | if (sdio_uart_claim_func(port) != 0) | |
915 | return; | |
916 | ||
917 | if (I_IXOFF(tty)) { | |
918 | if (port->x_char) { | |
919 | port->x_char = 0; | |
920 | } else { | |
921 | port->x_char = START_CHAR(tty); | |
922 | sdio_uart_start_tx(port); | |
923 | } | |
924 | } | |
925 | ||
926 | if (tty->termios->c_cflag & CRTSCTS) | |
927 | sdio_uart_set_mctrl(port, TIOCM_RTS); | |
928 | ||
929 | sdio_uart_irq(port->func); | |
930 | sdio_uart_release_func(port); | |
931 | } | |
932 | ||
c271cf37 AC |
933 | static void sdio_uart_set_termios(struct tty_struct *tty, |
934 | struct ktermios *old_termios) | |
6e418a9d NP |
935 | { |
936 | struct sdio_uart_port *port = tty->driver_data; | |
937 | unsigned int cflag = tty->termios->c_cflag; | |
938 | ||
6e418a9d NP |
939 | if (sdio_uart_claim_func(port) != 0) |
940 | return; | |
941 | ||
942 | sdio_uart_change_speed(port, tty->termios, old_termios); | |
943 | ||
944 | /* Handle transition to B0 status */ | |
945 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
946 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
947 | ||
948 | /* Handle transition away from B0 status */ | |
949 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
950 | unsigned int mask = TIOCM_DTR; | |
951 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
952 | mask |= TIOCM_RTS; | |
953 | sdio_uart_set_mctrl(port, mask); | |
954 | } | |
955 | ||
956 | /* Handle turning off CRTSCTS */ | |
957 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
958 | tty->hw_stopped = 0; | |
959 | sdio_uart_start_tx(port); | |
960 | } | |
961 | ||
962 | /* Handle turning on CRTSCTS */ | |
963 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
964 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
965 | tty->hw_stopped = 1; | |
966 | sdio_uart_stop_tx(port); | |
967 | } | |
968 | } | |
969 | ||
970 | sdio_uart_release_func(port); | |
971 | } | |
972 | ||
c43d8636 | 973 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
974 | { |
975 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 976 | int result; |
6e418a9d | 977 | |
c43d8636 DH |
978 | result = sdio_uart_claim_func(port); |
979 | if (result != 0) | |
980 | return result; | |
6e418a9d NP |
981 | |
982 | if (break_state == -1) | |
983 | port->lcr |= UART_LCR_SBC; | |
984 | else | |
985 | port->lcr &= ~UART_LCR_SBC; | |
986 | sdio_out(port, UART_LCR, port->lcr); | |
987 | ||
988 | sdio_uart_release_func(port); | |
c43d8636 | 989 | return 0; |
6e418a9d NP |
990 | } |
991 | ||
992 | static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file) | |
993 | { | |
994 | struct sdio_uart_port *port = tty->driver_data; | |
995 | int result; | |
996 | ||
997 | result = sdio_uart_claim_func(port); | |
998 | if (!result) { | |
999 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
1000 | sdio_uart_release_func(port); | |
1001 | } | |
1002 | ||
1003 | return result; | |
1004 | } | |
1005 | ||
1006 | static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file, | |
1007 | unsigned int set, unsigned int clear) | |
1008 | { | |
1009 | struct sdio_uart_port *port = tty->driver_data; | |
1010 | int result; | |
1011 | ||
1e04b7ae | 1012 | result = sdio_uart_claim_func(port); |
c271cf37 | 1013 | if (!result) { |
6e418a9d NP |
1014 | sdio_uart_update_mctrl(port, set, clear); |
1015 | sdio_uart_release_func(port); | |
1016 | } | |
1017 | ||
1018 | return result; | |
1019 | } | |
1020 | ||
201a50ba | 1021 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 1022 | { |
201a50ba | 1023 | int i; |
5ed334a1 | 1024 | |
201a50ba | 1025 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 1026 | "", "", ""); |
201a50ba | 1027 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
1028 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
1029 | if (port) { | |
201a50ba | 1030 | seq_printf(m, "%d: uart:SDIO", i); |
c271cf37 | 1031 | if (capable(CAP_SYS_ADMIN)) { |
201a50ba | 1032 | seq_printf(m, " tx:%d rx:%d", |
1e04b7ae | 1033 | port->icount.tx, port->icount.rx); |
5ed334a1 | 1034 | if (port->icount.frame) |
201a50ba | 1035 | seq_printf(m, " fe:%d", |
1e04b7ae | 1036 | port->icount.frame); |
5ed334a1 | 1037 | if (port->icount.parity) |
201a50ba | 1038 | seq_printf(m, " pe:%d", |
1e04b7ae | 1039 | port->icount.parity); |
5ed334a1 | 1040 | if (port->icount.brk) |
201a50ba | 1041 | seq_printf(m, " brk:%d", |
1e04b7ae | 1042 | port->icount.brk); |
5ed334a1 | 1043 | if (port->icount.overrun) |
201a50ba | 1044 | seq_printf(m, " oe:%d", |
1e04b7ae | 1045 | port->icount.overrun); |
5ed334a1 | 1046 | if (port->icount.cts) |
201a50ba | 1047 | seq_printf(m, " cts:%d", |
1e04b7ae | 1048 | port->icount.cts); |
5ed334a1 | 1049 | if (port->icount.dsr) |
201a50ba | 1050 | seq_printf(m, " dsr:%d", |
1e04b7ae | 1051 | port->icount.dsr); |
5ed334a1 | 1052 | if (port->icount.rng) |
201a50ba | 1053 | seq_printf(m, " rng:%d", |
1e04b7ae | 1054 | port->icount.rng); |
5ed334a1 | 1055 | if (port->icount.dcd) |
201a50ba | 1056 | seq_printf(m, " dcd:%d", |
1e04b7ae | 1057 | port->icount.dcd); |
5ed334a1 | 1058 | } |
5ed334a1 | 1059 | sdio_uart_port_put(port); |
201a50ba | 1060 | seq_putc(m, '\n'); |
5ed334a1 NP |
1061 | } |
1062 | } | |
201a50ba AD |
1063 | return 0; |
1064 | } | |
5ed334a1 | 1065 | |
201a50ba AD |
1066 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
1067 | { | |
1068 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
1069 | } |
1070 | ||
201a50ba AD |
1071 | static const struct file_operations sdio_uart_proc_fops = { |
1072 | .owner = THIS_MODULE, | |
1073 | .open = sdio_uart_proc_open, | |
1074 | .read = seq_read, | |
1075 | .llseek = seq_lseek, | |
1076 | .release = single_release, | |
1077 | }; | |
1078 | ||
584abc37 AC |
1079 | static const struct tty_port_operations sdio_uart_port_ops = { |
1080 | .dtr_rts = uart_dtr_rts, | |
4b3b49bb | 1081 | .carrier_raised = uart_carrier_raised, |
584abc37 AC |
1082 | .shutdown = sdio_uart_shutdown, |
1083 | .activate = sdio_uart_activate, | |
1084 | }; | |
1085 | ||
6e418a9d NP |
1086 | static const struct tty_operations sdio_uart_ops = { |
1087 | .open = sdio_uart_open, | |
1088 | .close = sdio_uart_close, | |
1089 | .write = sdio_uart_write, | |
1090 | .write_room = sdio_uart_write_room, | |
1091 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1092 | .send_xchar = sdio_uart_send_xchar, | |
1093 | .throttle = sdio_uart_throttle, | |
1094 | .unthrottle = sdio_uart_unthrottle, | |
1095 | .set_termios = sdio_uart_set_termios, | |
584abc37 | 1096 | .hangup = sdio_uart_hangup, |
6e418a9d NP |
1097 | .break_ctl = sdio_uart_break_ctl, |
1098 | .tiocmget = sdio_uart_tiocmget, | |
1099 | .tiocmset = sdio_uart_tiocmset, | |
584abc37 AC |
1100 | .install = sdio_uart_install, |
1101 | .cleanup = sdio_uart_cleanup, | |
201a50ba | 1102 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1103 | }; |
1104 | ||
1105 | static struct tty_driver *sdio_uart_tty_driver; | |
1106 | ||
1107 | static int sdio_uart_probe(struct sdio_func *func, | |
1108 | const struct sdio_device_id *id) | |
1109 | { | |
1110 | struct sdio_uart_port *port; | |
1111 | int ret; | |
1112 | ||
1113 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1114 | if (!port) | |
1115 | return -ENOMEM; | |
1116 | ||
1117 | if (func->class == SDIO_CLASS_UART) { | |
1118 | printk(KERN_WARNING "%s: need info on UART class basic setup\n", | |
1119 | sdio_func_id(func)); | |
1120 | kfree(port); | |
1121 | return -ENOSYS; | |
1122 | } else if (func->class == SDIO_CLASS_GPS) { | |
1123 | /* | |
1124 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1125 | * and SUBTPL_RCVCAPS. | |
1126 | */ | |
1127 | struct sdio_func_tuple *tpl; | |
1128 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1129 | if (tpl->code != 0x91) | |
1130 | continue; | |
1131 | if (tpl->size < 10) | |
1132 | continue; | |
1133 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1134 | break; | |
1135 | } | |
1136 | if (!tpl) { | |
1137 | printk(KERN_WARNING | |
c271cf37 | 1138 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", |
6e418a9d NP |
1139 | sdio_func_id(func)); |
1140 | kfree(port); | |
1141 | return -EINVAL; | |
1142 | } | |
1143 | printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", | |
1144 | sdio_func_id(func), tpl->data[2], tpl->data[3]); | |
1145 | port->regs_offset = (tpl->data[4] << 0) | | |
1146 | (tpl->data[5] << 8) | | |
1147 | (tpl->data[6] << 16); | |
1148 | printk(KERN_DEBUG "%s: regs offset = 0x%x\n", | |
1149 | sdio_func_id(func), port->regs_offset); | |
1150 | port->uartclk = tpl->data[7] * 115200; | |
1151 | if (port->uartclk == 0) | |
1152 | port->uartclk = 115200; | |
1153 | printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n", | |
1154 | sdio_func_id(func), port->uartclk, | |
1155 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1156 | } else { | |
1157 | kfree(port); | |
1158 | return -EINVAL; | |
1159 | } | |
1160 | ||
1161 | port->func = func; | |
1162 | sdio_set_drvdata(func, port); | |
b5849b1a | 1163 | tty_port_init(&port->port); |
584abc37 | 1164 | port->port.ops = &sdio_uart_port_ops; |
6e418a9d NP |
1165 | |
1166 | ret = sdio_uart_add_port(port); | |
1167 | if (ret) { | |
1168 | kfree(port); | |
1169 | } else { | |
1170 | struct device *dev; | |
c271cf37 AC |
1171 | dev = tty_register_device(sdio_uart_tty_driver, |
1172 | port->index, &func->dev); | |
6e418a9d NP |
1173 | if (IS_ERR(dev)) { |
1174 | sdio_uart_port_remove(port); | |
1175 | ret = PTR_ERR(dev); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | static void sdio_uart_remove(struct sdio_func *func) | |
1183 | { | |
1184 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1185 | ||
1186 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1187 | sdio_uart_port_remove(port); | |
1188 | } | |
1189 | ||
1190 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1191 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1192 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1193 | { /* end: all zeroes */ }, | |
1194 | }; | |
1195 | ||
1196 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1197 | ||
1198 | static struct sdio_driver sdio_uart_driver = { | |
1199 | .probe = sdio_uart_probe, | |
1200 | .remove = sdio_uart_remove, | |
1201 | .name = "sdio_uart", | |
1202 | .id_table = sdio_uart_ids, | |
1203 | }; | |
1204 | ||
1205 | static int __init sdio_uart_init(void) | |
1206 | { | |
1207 | int ret; | |
1208 | struct tty_driver *tty_drv; | |
1209 | ||
1210 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1211 | if (!tty_drv) | |
1212 | return -ENOMEM; | |
1213 | ||
1214 | tty_drv->owner = THIS_MODULE; | |
1215 | tty_drv->driver_name = "sdio_uart"; | |
1216 | tty_drv->name = "ttySDIO"; | |
1217 | tty_drv->major = 0; /* dynamically allocated */ | |
1218 | tty_drv->minor_start = 0; | |
1219 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1220 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1221 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1222 | tty_drv->init_termios = tty_std_termios; | |
1223 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1224 | tty_drv->init_termios.c_ispeed = 4800; |
1225 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1226 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1227 | ||
1228 | ret = tty_register_driver(tty_drv); | |
1229 | if (ret) | |
1230 | goto err1; | |
1231 | ||
1232 | ret = sdio_register_driver(&sdio_uart_driver); | |
1233 | if (ret) | |
1234 | goto err2; | |
1235 | ||
1236 | return 0; | |
1237 | ||
1238 | err2: | |
1239 | tty_unregister_driver(tty_drv); | |
1240 | err1: | |
1241 | put_tty_driver(tty_drv); | |
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | static void __exit sdio_uart_exit(void) | |
1246 | { | |
1247 | sdio_unregister_driver(&sdio_uart_driver); | |
1248 | tty_unregister_driver(sdio_uart_tty_driver); | |
1249 | put_tty_driver(sdio_uart_tty_driver); | |
1250 | } | |
1251 | ||
1252 | module_init(sdio_uart_init); | |
1253 | module_exit(sdio_uart_exit); | |
1254 | ||
1255 | MODULE_AUTHOR("Nicolas Pitre"); | |
1256 | MODULE_LICENSE("GPL"); |