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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> | |
6e418a9d NP |
37 | #include <linux/tty.h> |
38 | #include <linux/tty_flip.h> | |
8b197a5c | 39 | #include <linux/kfifo.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
6e418a9d NP |
41 | |
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 | ||
8b197a5c | 51 | #define FIFO_SIZE PAGE_SIZE |
6e418a9d NP |
52 | #define WAKEUP_CHARS 256 |
53 | ||
6e418a9d NP |
54 | struct 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 | ||
67 | struct sdio_uart_port { | |
b5849b1a | 68 | struct tty_port port; |
6e418a9d NP |
69 | struct kref kref; |
70 | struct tty_struct *tty; | |
71 | unsigned int index; | |
6e418a9d NP |
72 | struct sdio_func *func; |
73 | struct mutex func_lock; | |
15b82b46 | 74 | struct task_struct *in_sdio_uart_irq; |
6e418a9d | 75 | unsigned int regs_offset; |
8b197a5c | 76 | struct kfifo xmit_fifo; |
6e418a9d NP |
77 | spinlock_t write_lock; |
78 | struct uart_icount icount; | |
79 | unsigned int uartclk; | |
80 | unsigned int mctrl; | |
4b3b49bb | 81 | unsigned int rx_mctrl; |
6e418a9d NP |
82 | unsigned int read_status_mask; |
83 | unsigned int ignore_status_mask; | |
84 | unsigned char x_char; | |
85 | unsigned char ier; | |
86 | unsigned char lcr; | |
87 | }; | |
88 | ||
89 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
90 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
91 | ||
92 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
93 | { | |
94 | int index, ret = -EBUSY; | |
95 | ||
96 | kref_init(&port->kref); | |
6e418a9d NP |
97 | mutex_init(&port->func_lock); |
98 | spin_lock_init(&port->write_lock); | |
8b197a5c AC |
99 | if (kfifo_alloc(&port->xmit_fifo, FIFO_SIZE, GFP_KERNEL)) |
100 | return -ENOMEM; | |
6e418a9d NP |
101 | |
102 | spin_lock(&sdio_uart_table_lock); | |
103 | for (index = 0; index < UART_NR; index++) { | |
104 | if (!sdio_uart_table[index]) { | |
105 | port->index = index; | |
106 | sdio_uart_table[index] = port; | |
107 | ret = 0; | |
108 | break; | |
109 | } | |
110 | } | |
111 | spin_unlock(&sdio_uart_table_lock); | |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
116 | static struct sdio_uart_port *sdio_uart_port_get(unsigned index) | |
117 | { | |
118 | struct sdio_uart_port *port; | |
119 | ||
120 | if (index >= UART_NR) | |
121 | return NULL; | |
122 | ||
123 | spin_lock(&sdio_uart_table_lock); | |
124 | port = sdio_uart_table[index]; | |
125 | if (port) | |
126 | kref_get(&port->kref); | |
127 | spin_unlock(&sdio_uart_table_lock); | |
128 | ||
129 | return port; | |
130 | } | |
131 | ||
132 | static void sdio_uart_port_destroy(struct kref *kref) | |
133 | { | |
134 | struct sdio_uart_port *port = | |
135 | container_of(kref, struct sdio_uart_port, kref); | |
8b197a5c | 136 | kfifo_free(&port->xmit_fifo); |
6e418a9d NP |
137 | kfree(port); |
138 | } | |
139 | ||
140 | static void sdio_uart_port_put(struct sdio_uart_port *port) | |
141 | { | |
142 | kref_put(&port->kref, sdio_uart_port_destroy); | |
143 | } | |
144 | ||
145 | static void sdio_uart_port_remove(struct sdio_uart_port *port) | |
146 | { | |
147 | struct sdio_func *func; | |
584abc37 | 148 | struct tty_struct *tty; |
6e418a9d NP |
149 | |
150 | BUG_ON(sdio_uart_table[port->index] != port); | |
151 | ||
152 | spin_lock(&sdio_uart_table_lock); | |
153 | sdio_uart_table[port->index] = NULL; | |
154 | spin_unlock(&sdio_uart_table_lock); | |
155 | ||
156 | /* | |
157 | * We're killing a port that potentially still is in use by | |
158 | * the tty layer. Be careful to prevent any further access | |
159 | * to the SDIO function and arrange for the tty layer to | |
160 | * give up on that port ASAP. | |
161 | * Beware: the lock ordering is critical. | |
162 | */ | |
0a68f64f | 163 | mutex_lock(&port->port.mutex); |
6e418a9d NP |
164 | mutex_lock(&port->func_lock); |
165 | func = port->func; | |
166 | sdio_claim_host(func); | |
167 | port->func = NULL; | |
168 | mutex_unlock(&port->func_lock); | |
584abc37 AC |
169 | tty = tty_port_tty_get(&port->port); |
170 | /* tty_hangup is async so is this safe as is ?? */ | |
171 | if (tty) { | |
172 | tty_hangup(tty); | |
530646f4 AC |
173 | tty_kref_put(tty); |
174 | } | |
0a68f64f | 175 | mutex_unlock(&port->port.mutex); |
6e418a9d NP |
176 | sdio_release_irq(func); |
177 | sdio_disable_func(func); | |
178 | sdio_release_host(func); | |
179 | ||
180 | sdio_uart_port_put(port); | |
181 | } | |
182 | ||
183 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
184 | { | |
185 | mutex_lock(&port->func_lock); | |
186 | if (unlikely(!port->func)) { | |
187 | mutex_unlock(&port->func_lock); | |
188 | return -ENODEV; | |
189 | } | |
15b82b46 NP |
190 | if (likely(port->in_sdio_uart_irq != current)) |
191 | sdio_claim_host(port->func); | |
6e418a9d NP |
192 | mutex_unlock(&port->func_lock); |
193 | return 0; | |
194 | } | |
195 | ||
196 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
197 | { | |
15b82b46 NP |
198 | if (likely(port->in_sdio_uart_irq != current)) |
199 | sdio_release_host(port->func); | |
6e418a9d NP |
200 | } |
201 | ||
202 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
203 | { | |
204 | unsigned char c; | |
205 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
206 | return c; | |
207 | } | |
208 | ||
209 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
210 | { | |
211 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
212 | } | |
213 | ||
214 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
215 | { | |
216 | unsigned char status; | |
217 | unsigned int ret; | |
218 | ||
4b3b49bb AC |
219 | /* FIXME: What stops this losing the delta bits and breaking |
220 | sdio_uart_check_modem_status ? */ | |
6e418a9d NP |
221 | status = sdio_in(port, UART_MSR); |
222 | ||
223 | ret = 0; | |
224 | if (status & UART_MSR_DCD) | |
225 | ret |= TIOCM_CAR; | |
226 | if (status & UART_MSR_RI) | |
227 | ret |= TIOCM_RNG; | |
228 | if (status & UART_MSR_DSR) | |
229 | ret |= TIOCM_DSR; | |
230 | if (status & UART_MSR_CTS) | |
231 | ret |= TIOCM_CTS; | |
232 | return ret; | |
233 | } | |
234 | ||
1e04b7ae TLSC |
235 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, |
236 | unsigned int mctrl) | |
6e418a9d NP |
237 | { |
238 | unsigned char mcr = 0; | |
239 | ||
240 | if (mctrl & TIOCM_RTS) | |
241 | mcr |= UART_MCR_RTS; | |
242 | if (mctrl & TIOCM_DTR) | |
243 | mcr |= UART_MCR_DTR; | |
244 | if (mctrl & TIOCM_OUT1) | |
245 | mcr |= UART_MCR_OUT1; | |
246 | if (mctrl & TIOCM_OUT2) | |
247 | mcr |= UART_MCR_OUT2; | |
248 | if (mctrl & TIOCM_LOOP) | |
249 | mcr |= UART_MCR_LOOP; | |
250 | ||
251 | sdio_out(port, UART_MCR, mcr); | |
252 | } | |
253 | ||
254 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
255 | unsigned int set, unsigned int clear) | |
256 | { | |
257 | unsigned int old; | |
258 | ||
259 | old = port->mctrl; | |
260 | port->mctrl = (old & ~clear) | set; | |
261 | if (old != port->mctrl) | |
262 | sdio_uart_write_mctrl(port, port->mctrl); | |
263 | } | |
264 | ||
265 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
266 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
267 | ||
268 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
269 | struct ktermios *termios, | |
270 | struct ktermios *old) | |
271 | { | |
272 | unsigned char cval, fcr = 0; | |
273 | unsigned int baud, quot; | |
274 | ||
275 | switch (termios->c_cflag & CSIZE) { | |
276 | case CS5: | |
277 | cval = UART_LCR_WLEN5; | |
278 | break; | |
279 | case CS6: | |
280 | cval = UART_LCR_WLEN6; | |
281 | break; | |
282 | case CS7: | |
283 | cval = UART_LCR_WLEN7; | |
284 | break; | |
285 | default: | |
286 | case CS8: | |
287 | cval = UART_LCR_WLEN8; | |
288 | break; | |
289 | } | |
290 | ||
291 | if (termios->c_cflag & CSTOPB) | |
292 | cval |= UART_LCR_STOP; | |
293 | if (termios->c_cflag & PARENB) | |
294 | cval |= UART_LCR_PARITY; | |
295 | if (!(termios->c_cflag & PARODD)) | |
296 | cval |= UART_LCR_EPAR; | |
297 | ||
298 | for (;;) { | |
299 | baud = tty_termios_baud_rate(termios); | |
300 | if (baud == 0) | |
301 | baud = 9600; /* Special case: B0 rate. */ | |
302 | if (baud <= port->uartclk) | |
303 | break; | |
304 | /* | |
305 | * Oops, the quotient was zero. Try again with the old | |
306 | * baud rate if possible, otherwise default to 9600. | |
307 | */ | |
308 | termios->c_cflag &= ~CBAUD; | |
309 | if (old) { | |
310 | termios->c_cflag |= old->c_cflag & CBAUD; | |
311 | old = NULL; | |
312 | } else | |
313 | termios->c_cflag |= B9600; | |
314 | } | |
315 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
316 | ||
317 | if (baud < 2400) | |
318 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
319 | else | |
320 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
321 | ||
322 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
323 | if (termios->c_iflag & INPCK) | |
324 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
325 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
326 | port->read_status_mask |= UART_LSR_BI; | |
327 | ||
328 | /* | |
329 | * Characters to ignore | |
330 | */ | |
331 | port->ignore_status_mask = 0; | |
332 | if (termios->c_iflag & IGNPAR) | |
333 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
334 | if (termios->c_iflag & IGNBRK) { | |
335 | port->ignore_status_mask |= UART_LSR_BI; | |
336 | /* | |
337 | * If we're ignoring parity and break indicators, | |
338 | * ignore overruns too (for real raw support). | |
339 | */ | |
340 | if (termios->c_iflag & IGNPAR) | |
341 | port->ignore_status_mask |= UART_LSR_OE; | |
342 | } | |
343 | ||
344 | /* | |
345 | * ignore all characters if CREAD is not set | |
346 | */ | |
347 | if ((termios->c_cflag & CREAD) == 0) | |
348 | port->ignore_status_mask |= UART_LSR_DR; | |
349 | ||
350 | /* | |
351 | * CTS flow control flag and modem status interrupts | |
352 | */ | |
353 | port->ier &= ~UART_IER_MSI; | |
354 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
355 | port->ier |= UART_IER_MSI; | |
356 | ||
357 | port->lcr = cval; | |
358 | ||
359 | sdio_out(port, UART_IER, port->ier); | |
360 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
361 | sdio_out(port, UART_DLL, quot & 0xff); | |
362 | sdio_out(port, UART_DLM, quot >> 8); | |
363 | sdio_out(port, UART_LCR, cval); | |
364 | sdio_out(port, UART_FCR, fcr); | |
365 | ||
366 | sdio_uart_write_mctrl(port, port->mctrl); | |
367 | } | |
368 | ||
369 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
370 | { | |
371 | if (!(port->ier & UART_IER_THRI)) { | |
372 | port->ier |= UART_IER_THRI; | |
373 | sdio_out(port, UART_IER, port->ier); | |
374 | } | |
375 | } | |
376 | ||
377 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
378 | { | |
379 | if (port->ier & UART_IER_THRI) { | |
380 | port->ier &= ~UART_IER_THRI; | |
381 | sdio_out(port, UART_IER, port->ier); | |
382 | } | |
383 | } | |
384 | ||
385 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
386 | { | |
387 | port->ier &= ~UART_IER_RLSI; | |
388 | port->read_status_mask &= ~UART_LSR_DR; | |
389 | sdio_out(port, UART_IER, port->ier); | |
390 | } | |
391 | ||
1e04b7ae TLSC |
392 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, |
393 | unsigned int *status) | |
6e418a9d | 394 | { |
530646f4 | 395 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
6e418a9d NP |
396 | unsigned int ch, flag; |
397 | int max_count = 256; | |
398 | ||
399 | do { | |
400 | ch = sdio_in(port, UART_RX); | |
401 | flag = TTY_NORMAL; | |
402 | port->icount.rx++; | |
403 | ||
404 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
1e04b7ae | 405 | UART_LSR_FE | UART_LSR_OE))) { |
6e418a9d NP |
406 | /* |
407 | * For statistics only | |
408 | */ | |
409 | if (*status & UART_LSR_BI) { | |
410 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
411 | port->icount.brk++; | |
412 | } else if (*status & UART_LSR_PE) | |
413 | port->icount.parity++; | |
414 | else if (*status & UART_LSR_FE) | |
415 | port->icount.frame++; | |
416 | if (*status & UART_LSR_OE) | |
417 | port->icount.overrun++; | |
418 | ||
419 | /* | |
420 | * Mask off conditions which should be ignored. | |
421 | */ | |
422 | *status &= port->read_status_mask; | |
1e04b7ae | 423 | if (*status & UART_LSR_BI) |
6e418a9d | 424 | flag = TTY_BREAK; |
1e04b7ae | 425 | else if (*status & UART_LSR_PE) |
6e418a9d NP |
426 | flag = TTY_PARITY; |
427 | else if (*status & UART_LSR_FE) | |
428 | flag = TTY_FRAME; | |
429 | } | |
430 | ||
431 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
530646f4 AC |
432 | if (tty) |
433 | tty_insert_flip_char(tty, ch, flag); | |
6e418a9d NP |
434 | |
435 | /* | |
436 | * Overrun is special. Since it's reported immediately, | |
437 | * it doesn't affect the current character. | |
438 | */ | |
439 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
530646f4 AC |
440 | if (tty) |
441 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
6e418a9d NP |
442 | |
443 | *status = sdio_in(port, UART_LSR); | |
444 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
530646f4 AC |
445 | if (tty) { |
446 | tty_flip_buffer_push(tty); | |
447 | tty_kref_put(tty); | |
448 | } | |
6e418a9d NP |
449 | } |
450 | ||
451 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
452 | { | |
8b197a5c | 453 | struct kfifo *xmit = &port->xmit_fifo; |
6e418a9d | 454 | int count; |
530646f4 | 455 | struct tty_struct *tty; |
8b197a5c AC |
456 | u8 iobuf[16]; |
457 | int len; | |
6e418a9d NP |
458 | |
459 | if (port->x_char) { | |
460 | sdio_out(port, UART_TX, port->x_char); | |
461 | port->icount.tx++; | |
462 | port->x_char = 0; | |
463 | return; | |
464 | } | |
530646f4 AC |
465 | |
466 | tty = tty_port_tty_get(&port->port); | |
467 | ||
8b197a5c | 468 | if (tty == NULL || !kfifo_len(xmit) || |
c271cf37 | 469 | tty->stopped || tty->hw_stopped) { |
6e418a9d | 470 | sdio_uart_stop_tx(port); |
530646f4 | 471 | tty_kref_put(tty); |
6e418a9d NP |
472 | return; |
473 | } | |
474 | ||
8b197a5c AC |
475 | len = kfifo_out_locked(xmit, iobuf, 16, &port->write_lock); |
476 | for (count = 0; count < len; count++) { | |
477 | sdio_out(port, UART_TX, iobuf[count]); | |
6e418a9d | 478 | port->icount.tx++; |
8b197a5c | 479 | } |
6e418a9d | 480 | |
8b197a5c AC |
481 | len = kfifo_len(xmit); |
482 | if (len < WAKEUP_CHARS) { | |
b5849b1a | 483 | tty_wakeup(tty); |
8b197a5c AC |
484 | if (len == 0) |
485 | sdio_uart_stop_tx(port); | |
486 | } | |
530646f4 | 487 | tty_kref_put(tty); |
6e418a9d NP |
488 | } |
489 | ||
490 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
491 | { | |
492 | int status; | |
530646f4 | 493 | struct tty_struct *tty; |
6e418a9d NP |
494 | |
495 | status = sdio_in(port, UART_MSR); | |
496 | ||
497 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
498 | return; | |
499 | ||
500 | if (status & UART_MSR_TERI) | |
501 | port->icount.rng++; | |
502 | if (status & UART_MSR_DDSR) | |
503 | port->icount.dsr++; | |
4b3b49bb | 504 | if (status & UART_MSR_DDCD) { |
6e418a9d | 505 | port->icount.dcd++; |
4b3b49bb AC |
506 | /* DCD raise - wake for open */ |
507 | if (status & UART_MSR_DCD) | |
508 | wake_up_interruptible(&port->port.open_wait); | |
509 | else { | |
510 | /* DCD drop - hang up if tty attached */ | |
511 | tty = tty_port_tty_get(&port->port); | |
512 | if (tty) { | |
513 | tty_hangup(tty); | |
514 | tty_kref_put(tty); | |
515 | } | |
516 | } | |
517 | } | |
6e418a9d NP |
518 | if (status & UART_MSR_DCTS) { |
519 | port->icount.cts++; | |
530646f4 | 520 | tty = tty_port_tty_get(&port->port); |
adc8d746 | 521 | if (tty && (tty->termios.c_cflag & CRTSCTS)) { |
6e418a9d | 522 | int cts = (status & UART_MSR_CTS); |
b5849b1a | 523 | if (tty->hw_stopped) { |
6e418a9d | 524 | if (cts) { |
b5849b1a | 525 | tty->hw_stopped = 0; |
6e418a9d | 526 | sdio_uart_start_tx(port); |
b5849b1a | 527 | tty_wakeup(tty); |
6e418a9d NP |
528 | } |
529 | } else { | |
530 | if (!cts) { | |
b5849b1a | 531 | tty->hw_stopped = 1; |
6e418a9d NP |
532 | sdio_uart_stop_tx(port); |
533 | } | |
534 | } | |
535 | } | |
530646f4 | 536 | tty_kref_put(tty); |
6e418a9d NP |
537 | } |
538 | } | |
539 | ||
540 | /* | |
541 | * This handles the interrupt from one port. | |
542 | */ | |
543 | static void sdio_uart_irq(struct sdio_func *func) | |
544 | { | |
545 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
546 | unsigned int iir, lsr; | |
547 | ||
15b82b46 NP |
548 | /* |
549 | * In a few places sdio_uart_irq() is called directly instead of | |
550 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
551 | * thread scheduled in order to reduce latency. However, some | |
552 | * interaction with the tty core may end up calling us back | |
553 | * (serial echo, flow control, etc.) through those same places | |
554 | * causing undesirable effects. Let's stop the recursion here. | |
555 | */ | |
556 | if (unlikely(port->in_sdio_uart_irq == current)) | |
557 | return; | |
558 | ||
6e418a9d NP |
559 | iir = sdio_in(port, UART_IIR); |
560 | if (iir & UART_IIR_NO_INT) | |
561 | return; | |
15b82b46 NP |
562 | |
563 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
564 | lsr = sdio_in(port, UART_LSR); |
565 | if (lsr & UART_LSR_DR) | |
566 | sdio_uart_receive_chars(port, &lsr); | |
567 | sdio_uart_check_modem_status(port); | |
568 | if (lsr & UART_LSR_THRE) | |
569 | sdio_uart_transmit_chars(port); | |
15b82b46 | 570 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
571 | } |
572 | ||
4b3b49bb AC |
573 | static int uart_carrier_raised(struct tty_port *tport) |
574 | { | |
575 | struct sdio_uart_port *port = | |
576 | container_of(tport, struct sdio_uart_port, port); | |
577 | unsigned int ret = sdio_uart_claim_func(port); | |
c9404c9c | 578 | if (ret) /* Missing hardware shouldn't block for carrier */ |
4b3b49bb AC |
579 | return 1; |
580 | ret = sdio_uart_get_mctrl(port); | |
581 | sdio_uart_release_func(port); | |
582 | if (ret & TIOCM_CAR) | |
583 | return 1; | |
584 | return 0; | |
585 | } | |
586 | ||
584abc37 AC |
587 | /** |
588 | * uart_dtr_rts - port helper to set uart signals | |
589 | * @tport: tty port to be updated | |
590 | * @onoff: set to turn on DTR/RTS | |
591 | * | |
592 | * Called by the tty port helpers when the modem signals need to be | |
593 | * adjusted during an open, close and hangup. | |
594 | */ | |
595 | ||
596 | static void uart_dtr_rts(struct tty_port *tport, int onoff) | |
6e418a9d | 597 | { |
584abc37 AC |
598 | struct sdio_uart_port *port = |
599 | container_of(tport, struct sdio_uart_port, port); | |
1f100b32 AC |
600 | int ret = sdio_uart_claim_func(port); |
601 | if (ret) | |
602 | return; | |
584abc37 AC |
603 | if (onoff == 0) |
604 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
605 | else | |
606 | sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1f100b32 | 607 | sdio_uart_release_func(port); |
584abc37 | 608 | } |
530646f4 | 609 | |
584abc37 AC |
610 | /** |
611 | * sdio_uart_activate - start up hardware | |
612 | * @tport: tty port to activate | |
613 | * @tty: tty bound to this port | |
614 | * | |
615 | * Activate a tty port. The port locking guarantees us this will be | |
616 | * run exactly once per set of opens, and if successful will see the | |
617 | * shutdown method run exactly once to match. Start up and shutdown are | |
618 | * protected from each other by the internal locking and will not run | |
619 | * at the same time even during a hangup event. | |
620 | * | |
621 | * If we successfully start up the port we take an extra kref as we | |
622 | * will keep it around until shutdown when the kref is dropped. | |
623 | */ | |
624 | ||
625 | static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty) | |
626 | { | |
627 | struct sdio_uart_port *port = | |
628 | container_of(tport, struct sdio_uart_port, port); | |
584abc37 | 629 | int ret; |
6e418a9d NP |
630 | |
631 | /* | |
632 | * Set the TTY IO error marker - we will only clear this | |
633 | * once we have successfully opened the port. | |
634 | */ | |
b5849b1a | 635 | set_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d | 636 | |
8b197a5c | 637 | kfifo_reset(&port->xmit_fifo); |
6e418a9d NP |
638 | |
639 | ret = sdio_uart_claim_func(port); | |
640 | if (ret) | |
8b197a5c | 641 | return ret; |
6e418a9d NP |
642 | ret = sdio_enable_func(port->func); |
643 | if (ret) | |
8b197a5c | 644 | goto err1; |
6e418a9d NP |
645 | ret = sdio_claim_irq(port->func, sdio_uart_irq); |
646 | if (ret) | |
8b197a5c | 647 | goto err2; |
6e418a9d NP |
648 | |
649 | /* | |
650 | * Clear the FIFO buffers and disable them. | |
651 | * (they will be reenabled in sdio_change_speed()) | |
652 | */ | |
653 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
654 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1e04b7ae | 655 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
6e418a9d NP |
656 | sdio_out(port, UART_FCR, 0); |
657 | ||
658 | /* | |
659 | * Clear the interrupt registers. | |
660 | */ | |
661 | (void) sdio_in(port, UART_LSR); | |
662 | (void) sdio_in(port, UART_RX); | |
663 | (void) sdio_in(port, UART_IIR); | |
664 | (void) sdio_in(port, UART_MSR); | |
665 | ||
666 | /* | |
667 | * Now, initialize the UART | |
668 | */ | |
669 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
670 | ||
c271cf37 | 671 | port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE; |
6e418a9d NP |
672 | port->mctrl = TIOCM_OUT2; |
673 | ||
adc8d746 | 674 | sdio_uart_change_speed(port, &tty->termios, NULL); |
6e418a9d | 675 | |
adc8d746 | 676 | if (tty->termios.c_cflag & CBAUD) |
6e418a9d NP |
677 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); |
678 | ||
adc8d746 | 679 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d | 680 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) |
b5849b1a | 681 | tty->hw_stopped = 1; |
6e418a9d | 682 | |
0395b48c | 683 | clear_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
684 | |
685 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
686 | sdio_uart_irq(port->func); | |
687 | ||
688 | sdio_uart_release_func(port); | |
689 | return 0; | |
690 | ||
6e418a9d | 691 | err2: |
8b197a5c | 692 | sdio_disable_func(port->func); |
6e418a9d | 693 | err1: |
8b197a5c | 694 | sdio_uart_release_func(port); |
6e418a9d NP |
695 | return ret; |
696 | } | |
697 | ||
584abc37 AC |
698 | /** |
699 | * sdio_uart_shutdown - stop hardware | |
700 | * @tport: tty port to shut down | |
701 | * | |
702 | * Deactivate a tty port. The port locking guarantees us this will be | |
703 | * run only if a successful matching activate already ran. The two are | |
704 | * protected from each other by the internal locking and will not run | |
705 | * at the same time even during a hangup event. | |
706 | */ | |
707 | ||
708 | static void sdio_uart_shutdown(struct tty_port *tport) | |
6e418a9d | 709 | { |
584abc37 AC |
710 | struct sdio_uart_port *port = |
711 | container_of(tport, struct sdio_uart_port, port); | |
6e418a9d NP |
712 | int ret; |
713 | ||
714 | ret = sdio_uart_claim_func(port); | |
715 | if (ret) | |
8b197a5c | 716 | return; |
6e418a9d NP |
717 | |
718 | sdio_uart_stop_rx(port); | |
719 | ||
1e04b7ae | 720 | /* Disable interrupts from this port */ |
6e418a9d NP |
721 | sdio_release_irq(port->func); |
722 | port->ier = 0; | |
723 | sdio_out(port, UART_IER, 0); | |
724 | ||
725 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
726 | ||
727 | /* Disable break condition and FIFOs. */ | |
728 | port->lcr &= ~UART_LCR_SBC; | |
729 | sdio_out(port, UART_LCR, port->lcr); | |
730 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
731 | UART_FCR_CLEAR_RCVR | | |
732 | UART_FCR_CLEAR_XMIT); | |
733 | sdio_out(port, UART_FCR, 0); | |
734 | ||
735 | sdio_disable_func(port->func); | |
736 | ||
737 | sdio_uart_release_func(port); | |
6e418a9d NP |
738 | } |
739 | ||
584abc37 AC |
740 | /** |
741 | * sdio_uart_install - install method | |
742 | * @driver: the driver in use (sdio_uart in our case) | |
743 | * @tty: the tty being bound | |
744 | * | |
745 | * Look up and bind the tty and the driver together. Initialize | |
746 | * any needed private data (in our case the termios) | |
747 | */ | |
6e418a9d | 748 | |
584abc37 AC |
749 | static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty) |
750 | { | |
751 | int idx = tty->index; | |
752 | struct sdio_uart_port *port = sdio_uart_port_get(idx); | |
81f5835e | 753 | int ret = tty_standard_install(driver, tty); |
584abc37 | 754 | |
81f5835e | 755 | if (ret == 0) |
584abc37 AC |
756 | /* This is the ref sdio_uart_port get provided */ |
757 | tty->driver_data = port; | |
81f5835e | 758 | else |
6e418a9d | 759 | sdio_uart_port_put(port); |
584abc37 | 760 | return ret; |
6e418a9d NP |
761 | } |
762 | ||
584abc37 AC |
763 | /** |
764 | * sdio_uart_cleanup - called on the last tty kref drop | |
765 | * @tty: the tty being destroyed | |
766 | * | |
767 | * Called asynchronously when the last reference to the tty is dropped. | |
768 | * We cannot destroy the tty->driver_data port kref until this point | |
769 | */ | |
770 | ||
771 | static void sdio_uart_cleanup(struct tty_struct *tty) | |
6e418a9d NP |
772 | { |
773 | struct sdio_uart_port *port = tty->driver_data; | |
584abc37 AC |
774 | tty->driver_data = NULL; /* Bug trap */ |
775 | sdio_uart_port_put(port); | |
776 | } | |
6e418a9d | 777 | |
584abc37 AC |
778 | /* |
779 | * Open/close/hangup is now entirely boilerplate | |
780 | */ | |
6e418a9d | 781 | |
584abc37 AC |
782 | static int sdio_uart_open(struct tty_struct *tty, struct file *filp) |
783 | { | |
784 | struct sdio_uart_port *port = tty->driver_data; | |
785 | return tty_port_open(&port->port, tty, filp); | |
786 | } | |
6e418a9d | 787 | |
584abc37 AC |
788 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) |
789 | { | |
790 | struct sdio_uart_port *port = tty->driver_data; | |
791 | tty_port_close(&port->port, tty, filp); | |
792 | } | |
6e418a9d | 793 | |
584abc37 AC |
794 | static void sdio_uart_hangup(struct tty_struct *tty) |
795 | { | |
796 | struct sdio_uart_port *port = tty->driver_data; | |
797 | tty_port_hangup(&port->port); | |
6e418a9d NP |
798 | } |
799 | ||
c271cf37 | 800 | static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf, |
6e418a9d NP |
801 | int count) |
802 | { | |
803 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 804 | int ret; |
6e418a9d NP |
805 | |
806 | if (!port->func) | |
807 | return -ENODEV; | |
808 | ||
8b197a5c | 809 | ret = kfifo_in_locked(&port->xmit_fifo, buf, count, &port->write_lock); |
c271cf37 | 810 | if (!(port->ier & UART_IER_THRI)) { |
6e418a9d NP |
811 | int err = sdio_uart_claim_func(port); |
812 | if (!err) { | |
813 | sdio_uart_start_tx(port); | |
814 | sdio_uart_irq(port->func); | |
815 | sdio_uart_release_func(port); | |
816 | } else | |
817 | ret = err; | |
818 | } | |
819 | ||
820 | return ret; | |
821 | } | |
822 | ||
823 | static int sdio_uart_write_room(struct tty_struct *tty) | |
824 | { | |
825 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 826 | return FIFO_SIZE - kfifo_len(&port->xmit_fifo); |
6e418a9d NP |
827 | } |
828 | ||
829 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
830 | { | |
831 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 832 | return kfifo_len(&port->xmit_fifo); |
6e418a9d NP |
833 | } |
834 | ||
835 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
836 | { | |
837 | struct sdio_uart_port *port = tty->driver_data; | |
838 | ||
839 | port->x_char = ch; | |
840 | if (ch && !(port->ier & UART_IER_THRI)) { | |
841 | if (sdio_uart_claim_func(port) != 0) | |
842 | return; | |
843 | sdio_uart_start_tx(port); | |
844 | sdio_uart_irq(port->func); | |
845 | sdio_uart_release_func(port); | |
846 | } | |
847 | } | |
848 | ||
849 | static void sdio_uart_throttle(struct tty_struct *tty) | |
850 | { | |
851 | struct sdio_uart_port *port = tty->driver_data; | |
852 | ||
adc8d746 | 853 | if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS)) |
6e418a9d NP |
854 | return; |
855 | ||
856 | if (sdio_uart_claim_func(port) != 0) | |
857 | return; | |
858 | ||
859 | if (I_IXOFF(tty)) { | |
860 | port->x_char = STOP_CHAR(tty); | |
861 | sdio_uart_start_tx(port); | |
862 | } | |
863 | ||
adc8d746 | 864 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d NP |
865 | sdio_uart_clear_mctrl(port, TIOCM_RTS); |
866 | ||
867 | sdio_uart_irq(port->func); | |
868 | sdio_uart_release_func(port); | |
869 | } | |
870 | ||
871 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
872 | { | |
873 | struct sdio_uart_port *port = tty->driver_data; | |
874 | ||
adc8d746 | 875 | if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS)) |
6e418a9d NP |
876 | return; |
877 | ||
878 | if (sdio_uart_claim_func(port) != 0) | |
879 | return; | |
880 | ||
881 | if (I_IXOFF(tty)) { | |
882 | if (port->x_char) { | |
883 | port->x_char = 0; | |
884 | } else { | |
885 | port->x_char = START_CHAR(tty); | |
886 | sdio_uart_start_tx(port); | |
887 | } | |
888 | } | |
889 | ||
adc8d746 | 890 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d NP |
891 | sdio_uart_set_mctrl(port, TIOCM_RTS); |
892 | ||
893 | sdio_uart_irq(port->func); | |
894 | sdio_uart_release_func(port); | |
895 | } | |
896 | ||
c271cf37 AC |
897 | static void sdio_uart_set_termios(struct tty_struct *tty, |
898 | struct ktermios *old_termios) | |
6e418a9d NP |
899 | { |
900 | struct sdio_uart_port *port = tty->driver_data; | |
adc8d746 | 901 | unsigned int cflag = tty->termios.c_cflag; |
6e418a9d | 902 | |
6e418a9d NP |
903 | if (sdio_uart_claim_func(port) != 0) |
904 | return; | |
905 | ||
adc8d746 | 906 | sdio_uart_change_speed(port, &tty->termios, old_termios); |
6e418a9d NP |
907 | |
908 | /* Handle transition to B0 status */ | |
909 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
910 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
911 | ||
912 | /* Handle transition away from B0 status */ | |
913 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
914 | unsigned int mask = TIOCM_DTR; | |
915 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
916 | mask |= TIOCM_RTS; | |
917 | sdio_uart_set_mctrl(port, mask); | |
918 | } | |
919 | ||
920 | /* Handle turning off CRTSCTS */ | |
921 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
922 | tty->hw_stopped = 0; | |
923 | sdio_uart_start_tx(port); | |
924 | } | |
925 | ||
926 | /* Handle turning on CRTSCTS */ | |
927 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
928 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
929 | tty->hw_stopped = 1; | |
930 | sdio_uart_stop_tx(port); | |
931 | } | |
932 | } | |
933 | ||
934 | sdio_uart_release_func(port); | |
935 | } | |
936 | ||
c43d8636 | 937 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
938 | { |
939 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 940 | int result; |
6e418a9d | 941 | |
c43d8636 DH |
942 | result = sdio_uart_claim_func(port); |
943 | if (result != 0) | |
944 | return result; | |
6e418a9d NP |
945 | |
946 | if (break_state == -1) | |
947 | port->lcr |= UART_LCR_SBC; | |
948 | else | |
949 | port->lcr &= ~UART_LCR_SBC; | |
950 | sdio_out(port, UART_LCR, port->lcr); | |
951 | ||
952 | sdio_uart_release_func(port); | |
c43d8636 | 953 | return 0; |
6e418a9d NP |
954 | } |
955 | ||
60b33c13 | 956 | static int sdio_uart_tiocmget(struct tty_struct *tty) |
6e418a9d NP |
957 | { |
958 | struct sdio_uart_port *port = tty->driver_data; | |
959 | int result; | |
960 | ||
961 | result = sdio_uart_claim_func(port); | |
962 | if (!result) { | |
963 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
964 | sdio_uart_release_func(port); | |
965 | } | |
966 | ||
967 | return result; | |
968 | } | |
969 | ||
20b9d177 | 970 | static int sdio_uart_tiocmset(struct tty_struct *tty, |
6e418a9d NP |
971 | unsigned int set, unsigned int clear) |
972 | { | |
973 | struct sdio_uart_port *port = tty->driver_data; | |
974 | int result; | |
975 | ||
1e04b7ae | 976 | result = sdio_uart_claim_func(port); |
c271cf37 | 977 | if (!result) { |
6e418a9d NP |
978 | sdio_uart_update_mctrl(port, set, clear); |
979 | sdio_uart_release_func(port); | |
980 | } | |
981 | ||
982 | return result; | |
983 | } | |
984 | ||
201a50ba | 985 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 986 | { |
201a50ba | 987 | int i; |
5ed334a1 | 988 | |
201a50ba | 989 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 990 | "", "", ""); |
201a50ba | 991 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
992 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
993 | if (port) { | |
201a50ba | 994 | seq_printf(m, "%d: uart:SDIO", i); |
c271cf37 | 995 | if (capable(CAP_SYS_ADMIN)) { |
201a50ba | 996 | seq_printf(m, " tx:%d rx:%d", |
1e04b7ae | 997 | port->icount.tx, port->icount.rx); |
5ed334a1 | 998 | if (port->icount.frame) |
201a50ba | 999 | seq_printf(m, " fe:%d", |
1e04b7ae | 1000 | port->icount.frame); |
5ed334a1 | 1001 | if (port->icount.parity) |
201a50ba | 1002 | seq_printf(m, " pe:%d", |
1e04b7ae | 1003 | port->icount.parity); |
5ed334a1 | 1004 | if (port->icount.brk) |
201a50ba | 1005 | seq_printf(m, " brk:%d", |
1e04b7ae | 1006 | port->icount.brk); |
5ed334a1 | 1007 | if (port->icount.overrun) |
201a50ba | 1008 | seq_printf(m, " oe:%d", |
1e04b7ae | 1009 | port->icount.overrun); |
5ed334a1 | 1010 | if (port->icount.cts) |
201a50ba | 1011 | seq_printf(m, " cts:%d", |
1e04b7ae | 1012 | port->icount.cts); |
5ed334a1 | 1013 | if (port->icount.dsr) |
201a50ba | 1014 | seq_printf(m, " dsr:%d", |
1e04b7ae | 1015 | port->icount.dsr); |
5ed334a1 | 1016 | if (port->icount.rng) |
201a50ba | 1017 | seq_printf(m, " rng:%d", |
1e04b7ae | 1018 | port->icount.rng); |
5ed334a1 | 1019 | if (port->icount.dcd) |
201a50ba | 1020 | seq_printf(m, " dcd:%d", |
1e04b7ae | 1021 | port->icount.dcd); |
5ed334a1 | 1022 | } |
5ed334a1 | 1023 | sdio_uart_port_put(port); |
201a50ba | 1024 | seq_putc(m, '\n'); |
5ed334a1 NP |
1025 | } |
1026 | } | |
201a50ba AD |
1027 | return 0; |
1028 | } | |
5ed334a1 | 1029 | |
201a50ba AD |
1030 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
1031 | { | |
1032 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
1033 | } |
1034 | ||
201a50ba AD |
1035 | static const struct file_operations sdio_uart_proc_fops = { |
1036 | .owner = THIS_MODULE, | |
1037 | .open = sdio_uart_proc_open, | |
1038 | .read = seq_read, | |
1039 | .llseek = seq_lseek, | |
1040 | .release = single_release, | |
1041 | }; | |
1042 | ||
584abc37 AC |
1043 | static const struct tty_port_operations sdio_uart_port_ops = { |
1044 | .dtr_rts = uart_dtr_rts, | |
4b3b49bb | 1045 | .carrier_raised = uart_carrier_raised, |
584abc37 AC |
1046 | .shutdown = sdio_uart_shutdown, |
1047 | .activate = sdio_uart_activate, | |
1048 | }; | |
1049 | ||
6e418a9d NP |
1050 | static const struct tty_operations sdio_uart_ops = { |
1051 | .open = sdio_uart_open, | |
1052 | .close = sdio_uart_close, | |
1053 | .write = sdio_uart_write, | |
1054 | .write_room = sdio_uart_write_room, | |
1055 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1056 | .send_xchar = sdio_uart_send_xchar, | |
1057 | .throttle = sdio_uart_throttle, | |
1058 | .unthrottle = sdio_uart_unthrottle, | |
1059 | .set_termios = sdio_uart_set_termios, | |
584abc37 | 1060 | .hangup = sdio_uart_hangup, |
6e418a9d NP |
1061 | .break_ctl = sdio_uart_break_ctl, |
1062 | .tiocmget = sdio_uart_tiocmget, | |
1063 | .tiocmset = sdio_uart_tiocmset, | |
584abc37 AC |
1064 | .install = sdio_uart_install, |
1065 | .cleanup = sdio_uart_cleanup, | |
201a50ba | 1066 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1067 | }; |
1068 | ||
1069 | static struct tty_driver *sdio_uart_tty_driver; | |
1070 | ||
1071 | static int sdio_uart_probe(struct sdio_func *func, | |
1072 | const struct sdio_device_id *id) | |
1073 | { | |
1074 | struct sdio_uart_port *port; | |
1075 | int ret; | |
1076 | ||
1077 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1078 | if (!port) | |
1079 | return -ENOMEM; | |
1080 | ||
1081 | if (func->class == SDIO_CLASS_UART) { | |
a3c76eb9 | 1082 | pr_warning("%s: need info on UART class basic setup\n", |
6e418a9d NP |
1083 | sdio_func_id(func)); |
1084 | kfree(port); | |
1085 | return -ENOSYS; | |
1086 | } else if (func->class == SDIO_CLASS_GPS) { | |
1087 | /* | |
1088 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1089 | * and SUBTPL_RCVCAPS. | |
1090 | */ | |
1091 | struct sdio_func_tuple *tpl; | |
1092 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1093 | if (tpl->code != 0x91) | |
1094 | continue; | |
1095 | if (tpl->size < 10) | |
1096 | continue; | |
1097 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1098 | break; | |
1099 | } | |
1100 | if (!tpl) { | |
a3c76eb9 | 1101 | pr_warning( |
c271cf37 | 1102 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", |
6e418a9d NP |
1103 | sdio_func_id(func)); |
1104 | kfree(port); | |
1105 | return -EINVAL; | |
1106 | } | |
a3c76eb9 | 1107 | pr_debug("%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", |
6e418a9d NP |
1108 | sdio_func_id(func), tpl->data[2], tpl->data[3]); |
1109 | port->regs_offset = (tpl->data[4] << 0) | | |
1110 | (tpl->data[5] << 8) | | |
1111 | (tpl->data[6] << 16); | |
a3c76eb9 | 1112 | pr_debug("%s: regs offset = 0x%x\n", |
6e418a9d NP |
1113 | sdio_func_id(func), port->regs_offset); |
1114 | port->uartclk = tpl->data[7] * 115200; | |
1115 | if (port->uartclk == 0) | |
1116 | port->uartclk = 115200; | |
a3c76eb9 | 1117 | pr_debug("%s: clk %d baudcode %u 4800-div %u\n", |
6e418a9d NP |
1118 | sdio_func_id(func), port->uartclk, |
1119 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1120 | } else { | |
1121 | kfree(port); | |
1122 | return -EINVAL; | |
1123 | } | |
1124 | ||
1125 | port->func = func; | |
1126 | sdio_set_drvdata(func, port); | |
b5849b1a | 1127 | tty_port_init(&port->port); |
584abc37 | 1128 | port->port.ops = &sdio_uart_port_ops; |
6e418a9d NP |
1129 | |
1130 | ret = sdio_uart_add_port(port); | |
1131 | if (ret) { | |
1132 | kfree(port); | |
1133 | } else { | |
1134 | struct device *dev; | |
734cc178 JS |
1135 | dev = tty_port_register_device(&port->port, |
1136 | sdio_uart_tty_driver, port->index, &func->dev); | |
6e418a9d NP |
1137 | if (IS_ERR(dev)) { |
1138 | sdio_uart_port_remove(port); | |
1139 | ret = PTR_ERR(dev); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | static void sdio_uart_remove(struct sdio_func *func) | |
1147 | { | |
1148 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1149 | ||
1150 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1151 | sdio_uart_port_remove(port); | |
1152 | } | |
1153 | ||
1154 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1155 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1156 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1157 | { /* end: all zeroes */ }, | |
1158 | }; | |
1159 | ||
1160 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1161 | ||
1162 | static struct sdio_driver sdio_uart_driver = { | |
1163 | .probe = sdio_uart_probe, | |
1164 | .remove = sdio_uart_remove, | |
1165 | .name = "sdio_uart", | |
1166 | .id_table = sdio_uart_ids, | |
1167 | }; | |
1168 | ||
1169 | static int __init sdio_uart_init(void) | |
1170 | { | |
1171 | int ret; | |
1172 | struct tty_driver *tty_drv; | |
1173 | ||
1174 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1175 | if (!tty_drv) | |
1176 | return -ENOMEM; | |
1177 | ||
6e418a9d NP |
1178 | tty_drv->driver_name = "sdio_uart"; |
1179 | tty_drv->name = "ttySDIO"; | |
1180 | tty_drv->major = 0; /* dynamically allocated */ | |
1181 | tty_drv->minor_start = 0; | |
1182 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1183 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1184 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1185 | tty_drv->init_termios = tty_std_termios; | |
1186 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1187 | tty_drv->init_termios.c_ispeed = 4800; |
1188 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1189 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1190 | ||
1191 | ret = tty_register_driver(tty_drv); | |
1192 | if (ret) | |
1193 | goto err1; | |
1194 | ||
1195 | ret = sdio_register_driver(&sdio_uart_driver); | |
1196 | if (ret) | |
1197 | goto err2; | |
1198 | ||
1199 | return 0; | |
1200 | ||
1201 | err2: | |
1202 | tty_unregister_driver(tty_drv); | |
1203 | err1: | |
1204 | put_tty_driver(tty_drv); | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | static void __exit sdio_uart_exit(void) | |
1209 | { | |
1210 | sdio_unregister_driver(&sdio_uart_driver); | |
1211 | tty_unregister_driver(sdio_uart_tty_driver); | |
1212 | put_tty_driver(sdio_uart_tty_driver); | |
1213 | } | |
1214 | ||
1215 | module_init(sdio_uart_init); | |
1216 | module_exit(sdio_uart_exit); | |
1217 | ||
1218 | MODULE_AUTHOR("Nicolas Pitre"); | |
1219 | MODULE_LICENSE("GPL"); |