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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 | 69 | unsigned int index; |
6e418a9d NP |
70 | struct sdio_func *func; |
71 | struct mutex func_lock; | |
15b82b46 | 72 | struct task_struct *in_sdio_uart_irq; |
6e418a9d | 73 | unsigned int regs_offset; |
8b197a5c | 74 | struct kfifo xmit_fifo; |
6e418a9d NP |
75 | spinlock_t write_lock; |
76 | struct uart_icount icount; | |
77 | unsigned int uartclk; | |
78 | unsigned int mctrl; | |
4b3b49bb | 79 | unsigned int rx_mctrl; |
6e418a9d NP |
80 | unsigned int read_status_mask; |
81 | unsigned int ignore_status_mask; | |
82 | unsigned char x_char; | |
83 | unsigned char ier; | |
84 | unsigned char lcr; | |
85 | }; | |
86 | ||
87 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
88 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
89 | ||
90 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
91 | { | |
92 | int index, ret = -EBUSY; | |
93 | ||
6e418a9d NP |
94 | mutex_init(&port->func_lock); |
95 | spin_lock_init(&port->write_lock); | |
8b197a5c AC |
96 | if (kfifo_alloc(&port->xmit_fifo, FIFO_SIZE, GFP_KERNEL)) |
97 | return -ENOMEM; | |
6e418a9d NP |
98 | |
99 | spin_lock(&sdio_uart_table_lock); | |
100 | for (index = 0; index < UART_NR; index++) { | |
101 | if (!sdio_uart_table[index]) { | |
102 | port->index = index; | |
103 | sdio_uart_table[index] = port; | |
104 | ret = 0; | |
105 | break; | |
106 | } | |
107 | } | |
108 | spin_unlock(&sdio_uart_table_lock); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | static struct sdio_uart_port *sdio_uart_port_get(unsigned index) | |
114 | { | |
115 | struct sdio_uart_port *port; | |
116 | ||
117 | if (index >= UART_NR) | |
118 | return NULL; | |
119 | ||
120 | spin_lock(&sdio_uart_table_lock); | |
121 | port = sdio_uart_table[index]; | |
122 | if (port) | |
e70c6771 | 123 | tty_port_get(&port->port); |
6e418a9d NP |
124 | spin_unlock(&sdio_uart_table_lock); |
125 | ||
126 | return port; | |
127 | } | |
128 | ||
6e418a9d NP |
129 | static void sdio_uart_port_put(struct sdio_uart_port *port) |
130 | { | |
e70c6771 | 131 | tty_port_put(&port->port); |
6e418a9d NP |
132 | } |
133 | ||
134 | static void sdio_uart_port_remove(struct sdio_uart_port *port) | |
135 | { | |
136 | struct sdio_func *func; | |
584abc37 | 137 | struct tty_struct *tty; |
6e418a9d NP |
138 | |
139 | BUG_ON(sdio_uart_table[port->index] != port); | |
140 | ||
141 | spin_lock(&sdio_uart_table_lock); | |
142 | sdio_uart_table[port->index] = NULL; | |
143 | spin_unlock(&sdio_uart_table_lock); | |
144 | ||
145 | /* | |
146 | * We're killing a port that potentially still is in use by | |
147 | * the tty layer. Be careful to prevent any further access | |
148 | * to the SDIO function and arrange for the tty layer to | |
149 | * give up on that port ASAP. | |
150 | * Beware: the lock ordering is critical. | |
151 | */ | |
0a68f64f | 152 | mutex_lock(&port->port.mutex); |
6e418a9d NP |
153 | mutex_lock(&port->func_lock); |
154 | func = port->func; | |
155 | sdio_claim_host(func); | |
156 | port->func = NULL; | |
157 | mutex_unlock(&port->func_lock); | |
584abc37 AC |
158 | tty = tty_port_tty_get(&port->port); |
159 | /* tty_hangup is async so is this safe as is ?? */ | |
160 | if (tty) { | |
161 | tty_hangup(tty); | |
530646f4 AC |
162 | tty_kref_put(tty); |
163 | } | |
0a68f64f | 164 | mutex_unlock(&port->port.mutex); |
6e418a9d NP |
165 | sdio_release_irq(func); |
166 | sdio_disable_func(func); | |
167 | sdio_release_host(func); | |
168 | ||
169 | sdio_uart_port_put(port); | |
170 | } | |
171 | ||
172 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
173 | { | |
174 | mutex_lock(&port->func_lock); | |
175 | if (unlikely(!port->func)) { | |
176 | mutex_unlock(&port->func_lock); | |
177 | return -ENODEV; | |
178 | } | |
15b82b46 NP |
179 | if (likely(port->in_sdio_uart_irq != current)) |
180 | sdio_claim_host(port->func); | |
6e418a9d NP |
181 | mutex_unlock(&port->func_lock); |
182 | return 0; | |
183 | } | |
184 | ||
185 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
186 | { | |
15b82b46 NP |
187 | if (likely(port->in_sdio_uart_irq != current)) |
188 | sdio_release_host(port->func); | |
6e418a9d NP |
189 | } |
190 | ||
191 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
192 | { | |
193 | unsigned char c; | |
194 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
195 | return c; | |
196 | } | |
197 | ||
198 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
199 | { | |
200 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
201 | } | |
202 | ||
203 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
204 | { | |
205 | unsigned char status; | |
206 | unsigned int ret; | |
207 | ||
4b3b49bb AC |
208 | /* FIXME: What stops this losing the delta bits and breaking |
209 | sdio_uart_check_modem_status ? */ | |
6e418a9d NP |
210 | status = sdio_in(port, UART_MSR); |
211 | ||
212 | ret = 0; | |
213 | if (status & UART_MSR_DCD) | |
214 | ret |= TIOCM_CAR; | |
215 | if (status & UART_MSR_RI) | |
216 | ret |= TIOCM_RNG; | |
217 | if (status & UART_MSR_DSR) | |
218 | ret |= TIOCM_DSR; | |
219 | if (status & UART_MSR_CTS) | |
220 | ret |= TIOCM_CTS; | |
221 | return ret; | |
222 | } | |
223 | ||
1e04b7ae TLSC |
224 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, |
225 | unsigned int mctrl) | |
6e418a9d NP |
226 | { |
227 | unsigned char mcr = 0; | |
228 | ||
229 | if (mctrl & TIOCM_RTS) | |
230 | mcr |= UART_MCR_RTS; | |
231 | if (mctrl & TIOCM_DTR) | |
232 | mcr |= UART_MCR_DTR; | |
233 | if (mctrl & TIOCM_OUT1) | |
234 | mcr |= UART_MCR_OUT1; | |
235 | if (mctrl & TIOCM_OUT2) | |
236 | mcr |= UART_MCR_OUT2; | |
237 | if (mctrl & TIOCM_LOOP) | |
238 | mcr |= UART_MCR_LOOP; | |
239 | ||
240 | sdio_out(port, UART_MCR, mcr); | |
241 | } | |
242 | ||
243 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
244 | unsigned int set, unsigned int clear) | |
245 | { | |
246 | unsigned int old; | |
247 | ||
248 | old = port->mctrl; | |
249 | port->mctrl = (old & ~clear) | set; | |
250 | if (old != port->mctrl) | |
251 | sdio_uart_write_mctrl(port, port->mctrl); | |
252 | } | |
253 | ||
254 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
255 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
256 | ||
257 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
258 | struct ktermios *termios, | |
259 | struct ktermios *old) | |
260 | { | |
261 | unsigned char cval, fcr = 0; | |
262 | unsigned int baud, quot; | |
263 | ||
264 | switch (termios->c_cflag & CSIZE) { | |
265 | case CS5: | |
266 | cval = UART_LCR_WLEN5; | |
267 | break; | |
268 | case CS6: | |
269 | cval = UART_LCR_WLEN6; | |
270 | break; | |
271 | case CS7: | |
272 | cval = UART_LCR_WLEN7; | |
273 | break; | |
274 | default: | |
275 | case CS8: | |
276 | cval = UART_LCR_WLEN8; | |
277 | break; | |
278 | } | |
279 | ||
280 | if (termios->c_cflag & CSTOPB) | |
281 | cval |= UART_LCR_STOP; | |
282 | if (termios->c_cflag & PARENB) | |
283 | cval |= UART_LCR_PARITY; | |
284 | if (!(termios->c_cflag & PARODD)) | |
285 | cval |= UART_LCR_EPAR; | |
286 | ||
287 | for (;;) { | |
288 | baud = tty_termios_baud_rate(termios); | |
289 | if (baud == 0) | |
290 | baud = 9600; /* Special case: B0 rate. */ | |
291 | if (baud <= port->uartclk) | |
292 | break; | |
293 | /* | |
294 | * Oops, the quotient was zero. Try again with the old | |
295 | * baud rate if possible, otherwise default to 9600. | |
296 | */ | |
297 | termios->c_cflag &= ~CBAUD; | |
298 | if (old) { | |
299 | termios->c_cflag |= old->c_cflag & CBAUD; | |
300 | old = NULL; | |
301 | } else | |
302 | termios->c_cflag |= B9600; | |
303 | } | |
304 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
305 | ||
306 | if (baud < 2400) | |
307 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
308 | else | |
309 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
310 | ||
311 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
312 | if (termios->c_iflag & INPCK) | |
313 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
314 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
315 | port->read_status_mask |= UART_LSR_BI; | |
316 | ||
317 | /* | |
318 | * Characters to ignore | |
319 | */ | |
320 | port->ignore_status_mask = 0; | |
321 | if (termios->c_iflag & IGNPAR) | |
322 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
323 | if (termios->c_iflag & IGNBRK) { | |
324 | port->ignore_status_mask |= UART_LSR_BI; | |
325 | /* | |
326 | * If we're ignoring parity and break indicators, | |
327 | * ignore overruns too (for real raw support). | |
328 | */ | |
329 | if (termios->c_iflag & IGNPAR) | |
330 | port->ignore_status_mask |= UART_LSR_OE; | |
331 | } | |
332 | ||
333 | /* | |
334 | * ignore all characters if CREAD is not set | |
335 | */ | |
336 | if ((termios->c_cflag & CREAD) == 0) | |
337 | port->ignore_status_mask |= UART_LSR_DR; | |
338 | ||
339 | /* | |
340 | * CTS flow control flag and modem status interrupts | |
341 | */ | |
342 | port->ier &= ~UART_IER_MSI; | |
343 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
344 | port->ier |= UART_IER_MSI; | |
345 | ||
346 | port->lcr = cval; | |
347 | ||
348 | sdio_out(port, UART_IER, port->ier); | |
349 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
350 | sdio_out(port, UART_DLL, quot & 0xff); | |
351 | sdio_out(port, UART_DLM, quot >> 8); | |
352 | sdio_out(port, UART_LCR, cval); | |
353 | sdio_out(port, UART_FCR, fcr); | |
354 | ||
355 | sdio_uart_write_mctrl(port, port->mctrl); | |
356 | } | |
357 | ||
358 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
359 | { | |
360 | if (!(port->ier & UART_IER_THRI)) { | |
361 | port->ier |= UART_IER_THRI; | |
362 | sdio_out(port, UART_IER, port->ier); | |
363 | } | |
364 | } | |
365 | ||
366 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
367 | { | |
368 | if (port->ier & UART_IER_THRI) { | |
369 | port->ier &= ~UART_IER_THRI; | |
370 | sdio_out(port, UART_IER, port->ier); | |
371 | } | |
372 | } | |
373 | ||
374 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
375 | { | |
376 | port->ier &= ~UART_IER_RLSI; | |
377 | port->read_status_mask &= ~UART_LSR_DR; | |
378 | sdio_out(port, UART_IER, port->ier); | |
379 | } | |
380 | ||
1e04b7ae TLSC |
381 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, |
382 | unsigned int *status) | |
6e418a9d | 383 | { |
6e418a9d NP |
384 | unsigned int ch, flag; |
385 | int max_count = 256; | |
386 | ||
387 | do { | |
388 | ch = sdio_in(port, UART_RX); | |
389 | flag = TTY_NORMAL; | |
390 | port->icount.rx++; | |
391 | ||
392 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
1e04b7ae | 393 | UART_LSR_FE | UART_LSR_OE))) { |
6e418a9d NP |
394 | /* |
395 | * For statistics only | |
396 | */ | |
397 | if (*status & UART_LSR_BI) { | |
398 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
399 | port->icount.brk++; | |
400 | } else if (*status & UART_LSR_PE) | |
401 | port->icount.parity++; | |
402 | else if (*status & UART_LSR_FE) | |
403 | port->icount.frame++; | |
404 | if (*status & UART_LSR_OE) | |
405 | port->icount.overrun++; | |
406 | ||
407 | /* | |
408 | * Mask off conditions which should be ignored. | |
409 | */ | |
410 | *status &= port->read_status_mask; | |
1e04b7ae | 411 | if (*status & UART_LSR_BI) |
6e418a9d | 412 | flag = TTY_BREAK; |
1e04b7ae | 413 | else if (*status & UART_LSR_PE) |
6e418a9d NP |
414 | flag = TTY_PARITY; |
415 | else if (*status & UART_LSR_FE) | |
416 | flag = TTY_FRAME; | |
417 | } | |
418 | ||
419 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
2e124b4a | 420 | tty_insert_flip_char(&port->port, ch, flag); |
6e418a9d NP |
421 | |
422 | /* | |
423 | * Overrun is special. Since it's reported immediately, | |
424 | * it doesn't affect the current character. | |
425 | */ | |
426 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
2e124b4a | 427 | tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); |
6e418a9d NP |
428 | |
429 | *status = sdio_in(port, UART_LSR); | |
430 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
2e124b4a JS |
431 | |
432 | tty_flip_buffer_push(&port->port); | |
6e418a9d NP |
433 | } |
434 | ||
435 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
436 | { | |
8b197a5c | 437 | struct kfifo *xmit = &port->xmit_fifo; |
6e418a9d | 438 | int count; |
530646f4 | 439 | struct tty_struct *tty; |
8b197a5c AC |
440 | u8 iobuf[16]; |
441 | int len; | |
6e418a9d NP |
442 | |
443 | if (port->x_char) { | |
444 | sdio_out(port, UART_TX, port->x_char); | |
445 | port->icount.tx++; | |
446 | port->x_char = 0; | |
447 | return; | |
448 | } | |
530646f4 AC |
449 | |
450 | tty = tty_port_tty_get(&port->port); | |
451 | ||
8b197a5c | 452 | if (tty == NULL || !kfifo_len(xmit) || |
c271cf37 | 453 | tty->stopped || tty->hw_stopped) { |
6e418a9d | 454 | sdio_uart_stop_tx(port); |
530646f4 | 455 | tty_kref_put(tty); |
6e418a9d NP |
456 | return; |
457 | } | |
458 | ||
8b197a5c AC |
459 | len = kfifo_out_locked(xmit, iobuf, 16, &port->write_lock); |
460 | for (count = 0; count < len; count++) { | |
461 | sdio_out(port, UART_TX, iobuf[count]); | |
6e418a9d | 462 | port->icount.tx++; |
8b197a5c | 463 | } |
6e418a9d | 464 | |
8b197a5c AC |
465 | len = kfifo_len(xmit); |
466 | if (len < WAKEUP_CHARS) { | |
b5849b1a | 467 | tty_wakeup(tty); |
8b197a5c AC |
468 | if (len == 0) |
469 | sdio_uart_stop_tx(port); | |
470 | } | |
530646f4 | 471 | tty_kref_put(tty); |
6e418a9d NP |
472 | } |
473 | ||
474 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
475 | { | |
476 | int status; | |
530646f4 | 477 | struct tty_struct *tty; |
6e418a9d NP |
478 | |
479 | status = sdio_in(port, UART_MSR); | |
480 | ||
481 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
482 | return; | |
483 | ||
484 | if (status & UART_MSR_TERI) | |
485 | port->icount.rng++; | |
486 | if (status & UART_MSR_DDSR) | |
487 | port->icount.dsr++; | |
4b3b49bb | 488 | if (status & UART_MSR_DDCD) { |
6e418a9d | 489 | port->icount.dcd++; |
4b3b49bb AC |
490 | /* DCD raise - wake for open */ |
491 | if (status & UART_MSR_DCD) | |
492 | wake_up_interruptible(&port->port.open_wait); | |
493 | else { | |
494 | /* DCD drop - hang up if tty attached */ | |
495 | tty = tty_port_tty_get(&port->port); | |
496 | if (tty) { | |
497 | tty_hangup(tty); | |
498 | tty_kref_put(tty); | |
499 | } | |
500 | } | |
501 | } | |
6e418a9d NP |
502 | if (status & UART_MSR_DCTS) { |
503 | port->icount.cts++; | |
530646f4 | 504 | tty = tty_port_tty_get(&port->port); |
adc8d746 | 505 | if (tty && (tty->termios.c_cflag & CRTSCTS)) { |
6e418a9d | 506 | int cts = (status & UART_MSR_CTS); |
b5849b1a | 507 | if (tty->hw_stopped) { |
6e418a9d | 508 | if (cts) { |
b5849b1a | 509 | tty->hw_stopped = 0; |
6e418a9d | 510 | sdio_uart_start_tx(port); |
b5849b1a | 511 | tty_wakeup(tty); |
6e418a9d NP |
512 | } |
513 | } else { | |
514 | if (!cts) { | |
b5849b1a | 515 | tty->hw_stopped = 1; |
6e418a9d NP |
516 | sdio_uart_stop_tx(port); |
517 | } | |
518 | } | |
519 | } | |
530646f4 | 520 | tty_kref_put(tty); |
6e418a9d NP |
521 | } |
522 | } | |
523 | ||
524 | /* | |
525 | * This handles the interrupt from one port. | |
526 | */ | |
527 | static void sdio_uart_irq(struct sdio_func *func) | |
528 | { | |
529 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
530 | unsigned int iir, lsr; | |
531 | ||
15b82b46 NP |
532 | /* |
533 | * In a few places sdio_uart_irq() is called directly instead of | |
534 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
535 | * thread scheduled in order to reduce latency. However, some | |
536 | * interaction with the tty core may end up calling us back | |
537 | * (serial echo, flow control, etc.) through those same places | |
538 | * causing undesirable effects. Let's stop the recursion here. | |
539 | */ | |
540 | if (unlikely(port->in_sdio_uart_irq == current)) | |
541 | return; | |
542 | ||
6e418a9d NP |
543 | iir = sdio_in(port, UART_IIR); |
544 | if (iir & UART_IIR_NO_INT) | |
545 | return; | |
15b82b46 NP |
546 | |
547 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
548 | lsr = sdio_in(port, UART_LSR); |
549 | if (lsr & UART_LSR_DR) | |
550 | sdio_uart_receive_chars(port, &lsr); | |
551 | sdio_uart_check_modem_status(port); | |
552 | if (lsr & UART_LSR_THRE) | |
553 | sdio_uart_transmit_chars(port); | |
15b82b46 | 554 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
555 | } |
556 | ||
4b3b49bb AC |
557 | static int uart_carrier_raised(struct tty_port *tport) |
558 | { | |
559 | struct sdio_uart_port *port = | |
560 | container_of(tport, struct sdio_uart_port, port); | |
561 | unsigned int ret = sdio_uart_claim_func(port); | |
c9404c9c | 562 | if (ret) /* Missing hardware shouldn't block for carrier */ |
4b3b49bb AC |
563 | return 1; |
564 | ret = sdio_uart_get_mctrl(port); | |
565 | sdio_uart_release_func(port); | |
566 | if (ret & TIOCM_CAR) | |
567 | return 1; | |
568 | return 0; | |
569 | } | |
570 | ||
584abc37 AC |
571 | /** |
572 | * uart_dtr_rts - port helper to set uart signals | |
573 | * @tport: tty port to be updated | |
574 | * @onoff: set to turn on DTR/RTS | |
575 | * | |
576 | * Called by the tty port helpers when the modem signals need to be | |
577 | * adjusted during an open, close and hangup. | |
578 | */ | |
579 | ||
580 | static void uart_dtr_rts(struct tty_port *tport, int onoff) | |
6e418a9d | 581 | { |
584abc37 AC |
582 | struct sdio_uart_port *port = |
583 | container_of(tport, struct sdio_uart_port, port); | |
1f100b32 AC |
584 | int ret = sdio_uart_claim_func(port); |
585 | if (ret) | |
586 | return; | |
584abc37 AC |
587 | if (onoff == 0) |
588 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
589 | else | |
590 | sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
1f100b32 | 591 | sdio_uart_release_func(port); |
584abc37 | 592 | } |
530646f4 | 593 | |
584abc37 AC |
594 | /** |
595 | * sdio_uart_activate - start up hardware | |
596 | * @tport: tty port to activate | |
597 | * @tty: tty bound to this port | |
598 | * | |
599 | * Activate a tty port. The port locking guarantees us this will be | |
600 | * run exactly once per set of opens, and if successful will see the | |
601 | * shutdown method run exactly once to match. Start up and shutdown are | |
602 | * protected from each other by the internal locking and will not run | |
603 | * at the same time even during a hangup event. | |
604 | * | |
605 | * If we successfully start up the port we take an extra kref as we | |
606 | * will keep it around until shutdown when the kref is dropped. | |
607 | */ | |
608 | ||
609 | static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty) | |
610 | { | |
611 | struct sdio_uart_port *port = | |
612 | container_of(tport, struct sdio_uart_port, port); | |
584abc37 | 613 | int ret; |
6e418a9d NP |
614 | |
615 | /* | |
616 | * Set the TTY IO error marker - we will only clear this | |
617 | * once we have successfully opened the port. | |
618 | */ | |
b5849b1a | 619 | set_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d | 620 | |
8b197a5c | 621 | kfifo_reset(&port->xmit_fifo); |
6e418a9d NP |
622 | |
623 | ret = sdio_uart_claim_func(port); | |
624 | if (ret) | |
8b197a5c | 625 | return ret; |
6e418a9d NP |
626 | ret = sdio_enable_func(port->func); |
627 | if (ret) | |
8b197a5c | 628 | goto err1; |
6e418a9d NP |
629 | ret = sdio_claim_irq(port->func, sdio_uart_irq); |
630 | if (ret) | |
8b197a5c | 631 | goto err2; |
6e418a9d NP |
632 | |
633 | /* | |
634 | * Clear the FIFO buffers and disable them. | |
635 | * (they will be reenabled in sdio_change_speed()) | |
636 | */ | |
637 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
638 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1e04b7ae | 639 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
6e418a9d NP |
640 | sdio_out(port, UART_FCR, 0); |
641 | ||
642 | /* | |
643 | * Clear the interrupt registers. | |
644 | */ | |
645 | (void) sdio_in(port, UART_LSR); | |
646 | (void) sdio_in(port, UART_RX); | |
647 | (void) sdio_in(port, UART_IIR); | |
648 | (void) sdio_in(port, UART_MSR); | |
649 | ||
650 | /* | |
651 | * Now, initialize the UART | |
652 | */ | |
653 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
654 | ||
c271cf37 | 655 | port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE; |
6e418a9d NP |
656 | port->mctrl = TIOCM_OUT2; |
657 | ||
adc8d746 | 658 | sdio_uart_change_speed(port, &tty->termios, NULL); |
6e418a9d | 659 | |
adc8d746 | 660 | if (tty->termios.c_cflag & CBAUD) |
6e418a9d NP |
661 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); |
662 | ||
adc8d746 | 663 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d | 664 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) |
b5849b1a | 665 | tty->hw_stopped = 1; |
6e418a9d | 666 | |
0395b48c | 667 | clear_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
668 | |
669 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
670 | sdio_uart_irq(port->func); | |
671 | ||
672 | sdio_uart_release_func(port); | |
673 | return 0; | |
674 | ||
6e418a9d | 675 | err2: |
8b197a5c | 676 | sdio_disable_func(port->func); |
6e418a9d | 677 | err1: |
8b197a5c | 678 | sdio_uart_release_func(port); |
6e418a9d NP |
679 | return ret; |
680 | } | |
681 | ||
584abc37 AC |
682 | /** |
683 | * sdio_uart_shutdown - stop hardware | |
684 | * @tport: tty port to shut down | |
685 | * | |
686 | * Deactivate a tty port. The port locking guarantees us this will be | |
687 | * run only if a successful matching activate already ran. The two are | |
688 | * protected from each other by the internal locking and will not run | |
689 | * at the same time even during a hangup event. | |
690 | */ | |
691 | ||
692 | static void sdio_uart_shutdown(struct tty_port *tport) | |
6e418a9d | 693 | { |
584abc37 AC |
694 | struct sdio_uart_port *port = |
695 | container_of(tport, struct sdio_uart_port, port); | |
6e418a9d NP |
696 | int ret; |
697 | ||
698 | ret = sdio_uart_claim_func(port); | |
699 | if (ret) | |
8b197a5c | 700 | return; |
6e418a9d NP |
701 | |
702 | sdio_uart_stop_rx(port); | |
703 | ||
1e04b7ae | 704 | /* Disable interrupts from this port */ |
6e418a9d NP |
705 | sdio_release_irq(port->func); |
706 | port->ier = 0; | |
707 | sdio_out(port, UART_IER, 0); | |
708 | ||
709 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
710 | ||
711 | /* Disable break condition and FIFOs. */ | |
712 | port->lcr &= ~UART_LCR_SBC; | |
713 | sdio_out(port, UART_LCR, port->lcr); | |
714 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
715 | UART_FCR_CLEAR_RCVR | | |
716 | UART_FCR_CLEAR_XMIT); | |
717 | sdio_out(port, UART_FCR, 0); | |
718 | ||
719 | sdio_disable_func(port->func); | |
720 | ||
721 | sdio_uart_release_func(port); | |
6e418a9d NP |
722 | } |
723 | ||
e70c6771 JS |
724 | static void sdio_uart_port_destroy(struct tty_port *tport) |
725 | { | |
726 | struct sdio_uart_port *port = | |
727 | container_of(tport, struct sdio_uart_port, port); | |
728 | kfifo_free(&port->xmit_fifo); | |
729 | kfree(port); | |
730 | } | |
731 | ||
584abc37 AC |
732 | /** |
733 | * sdio_uart_install - install method | |
734 | * @driver: the driver in use (sdio_uart in our case) | |
735 | * @tty: the tty being bound | |
736 | * | |
737 | * Look up and bind the tty and the driver together. Initialize | |
738 | * any needed private data (in our case the termios) | |
739 | */ | |
6e418a9d | 740 | |
584abc37 AC |
741 | static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty) |
742 | { | |
743 | int idx = tty->index; | |
744 | struct sdio_uart_port *port = sdio_uart_port_get(idx); | |
81f5835e | 745 | int ret = tty_standard_install(driver, tty); |
584abc37 | 746 | |
81f5835e | 747 | if (ret == 0) |
584abc37 AC |
748 | /* This is the ref sdio_uart_port get provided */ |
749 | tty->driver_data = port; | |
81f5835e | 750 | else |
6e418a9d | 751 | sdio_uart_port_put(port); |
584abc37 | 752 | return ret; |
6e418a9d NP |
753 | } |
754 | ||
584abc37 AC |
755 | /** |
756 | * sdio_uart_cleanup - called on the last tty kref drop | |
757 | * @tty: the tty being destroyed | |
758 | * | |
759 | * Called asynchronously when the last reference to the tty is dropped. | |
760 | * We cannot destroy the tty->driver_data port kref until this point | |
761 | */ | |
762 | ||
763 | static void sdio_uart_cleanup(struct tty_struct *tty) | |
6e418a9d NP |
764 | { |
765 | struct sdio_uart_port *port = tty->driver_data; | |
584abc37 AC |
766 | tty->driver_data = NULL; /* Bug trap */ |
767 | sdio_uart_port_put(port); | |
768 | } | |
6e418a9d | 769 | |
584abc37 AC |
770 | /* |
771 | * Open/close/hangup is now entirely boilerplate | |
772 | */ | |
6e418a9d | 773 | |
584abc37 AC |
774 | static int sdio_uart_open(struct tty_struct *tty, struct file *filp) |
775 | { | |
776 | struct sdio_uart_port *port = tty->driver_data; | |
777 | return tty_port_open(&port->port, tty, filp); | |
778 | } | |
6e418a9d | 779 | |
584abc37 AC |
780 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) |
781 | { | |
782 | struct sdio_uart_port *port = tty->driver_data; | |
783 | tty_port_close(&port->port, tty, filp); | |
784 | } | |
6e418a9d | 785 | |
584abc37 AC |
786 | static void sdio_uart_hangup(struct tty_struct *tty) |
787 | { | |
788 | struct sdio_uart_port *port = tty->driver_data; | |
789 | tty_port_hangup(&port->port); | |
6e418a9d NP |
790 | } |
791 | ||
c271cf37 | 792 | static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf, |
6e418a9d NP |
793 | int count) |
794 | { | |
795 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 796 | int ret; |
6e418a9d NP |
797 | |
798 | if (!port->func) | |
799 | return -ENODEV; | |
800 | ||
8b197a5c | 801 | ret = kfifo_in_locked(&port->xmit_fifo, buf, count, &port->write_lock); |
c271cf37 | 802 | if (!(port->ier & UART_IER_THRI)) { |
6e418a9d NP |
803 | int err = sdio_uart_claim_func(port); |
804 | if (!err) { | |
805 | sdio_uart_start_tx(port); | |
806 | sdio_uart_irq(port->func); | |
807 | sdio_uart_release_func(port); | |
808 | } else | |
809 | ret = err; | |
810 | } | |
811 | ||
812 | return ret; | |
813 | } | |
814 | ||
815 | static int sdio_uart_write_room(struct tty_struct *tty) | |
816 | { | |
817 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 818 | return FIFO_SIZE - kfifo_len(&port->xmit_fifo); |
6e418a9d NP |
819 | } |
820 | ||
821 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
822 | { | |
823 | struct sdio_uart_port *port = tty->driver_data; | |
8b197a5c | 824 | return kfifo_len(&port->xmit_fifo); |
6e418a9d NP |
825 | } |
826 | ||
827 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
828 | { | |
829 | struct sdio_uart_port *port = tty->driver_data; | |
830 | ||
831 | port->x_char = ch; | |
832 | if (ch && !(port->ier & UART_IER_THRI)) { | |
833 | if (sdio_uart_claim_func(port) != 0) | |
834 | return; | |
835 | sdio_uart_start_tx(port); | |
836 | sdio_uart_irq(port->func); | |
837 | sdio_uart_release_func(port); | |
838 | } | |
839 | } | |
840 | ||
841 | static void sdio_uart_throttle(struct tty_struct *tty) | |
842 | { | |
843 | struct sdio_uart_port *port = tty->driver_data; | |
844 | ||
adc8d746 | 845 | if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS)) |
6e418a9d NP |
846 | return; |
847 | ||
848 | if (sdio_uart_claim_func(port) != 0) | |
849 | return; | |
850 | ||
851 | if (I_IXOFF(tty)) { | |
852 | port->x_char = STOP_CHAR(tty); | |
853 | sdio_uart_start_tx(port); | |
854 | } | |
855 | ||
adc8d746 | 856 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d NP |
857 | sdio_uart_clear_mctrl(port, TIOCM_RTS); |
858 | ||
859 | sdio_uart_irq(port->func); | |
860 | sdio_uart_release_func(port); | |
861 | } | |
862 | ||
863 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
864 | { | |
865 | struct sdio_uart_port *port = tty->driver_data; | |
866 | ||
adc8d746 | 867 | if (!I_IXOFF(tty) && !(tty->termios.c_cflag & CRTSCTS)) |
6e418a9d NP |
868 | return; |
869 | ||
870 | if (sdio_uart_claim_func(port) != 0) | |
871 | return; | |
872 | ||
873 | if (I_IXOFF(tty)) { | |
874 | if (port->x_char) { | |
875 | port->x_char = 0; | |
876 | } else { | |
877 | port->x_char = START_CHAR(tty); | |
878 | sdio_uart_start_tx(port); | |
879 | } | |
880 | } | |
881 | ||
adc8d746 | 882 | if (tty->termios.c_cflag & CRTSCTS) |
6e418a9d NP |
883 | sdio_uart_set_mctrl(port, TIOCM_RTS); |
884 | ||
885 | sdio_uart_irq(port->func); | |
886 | sdio_uart_release_func(port); | |
887 | } | |
888 | ||
c271cf37 AC |
889 | static void sdio_uart_set_termios(struct tty_struct *tty, |
890 | struct ktermios *old_termios) | |
6e418a9d NP |
891 | { |
892 | struct sdio_uart_port *port = tty->driver_data; | |
adc8d746 | 893 | unsigned int cflag = tty->termios.c_cflag; |
6e418a9d | 894 | |
6e418a9d NP |
895 | if (sdio_uart_claim_func(port) != 0) |
896 | return; | |
897 | ||
adc8d746 | 898 | sdio_uart_change_speed(port, &tty->termios, old_termios); |
6e418a9d NP |
899 | |
900 | /* Handle transition to B0 status */ | |
901 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
902 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
903 | ||
904 | /* Handle transition away from B0 status */ | |
905 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
906 | unsigned int mask = TIOCM_DTR; | |
907 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
908 | mask |= TIOCM_RTS; | |
909 | sdio_uart_set_mctrl(port, mask); | |
910 | } | |
911 | ||
912 | /* Handle turning off CRTSCTS */ | |
913 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
914 | tty->hw_stopped = 0; | |
915 | sdio_uart_start_tx(port); | |
916 | } | |
917 | ||
918 | /* Handle turning on CRTSCTS */ | |
919 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
920 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
921 | tty->hw_stopped = 1; | |
922 | sdio_uart_stop_tx(port); | |
923 | } | |
924 | } | |
925 | ||
926 | sdio_uart_release_func(port); | |
927 | } | |
928 | ||
c43d8636 | 929 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
930 | { |
931 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 932 | int result; |
6e418a9d | 933 | |
c43d8636 DH |
934 | result = sdio_uart_claim_func(port); |
935 | if (result != 0) | |
936 | return result; | |
6e418a9d NP |
937 | |
938 | if (break_state == -1) | |
939 | port->lcr |= UART_LCR_SBC; | |
940 | else | |
941 | port->lcr &= ~UART_LCR_SBC; | |
942 | sdio_out(port, UART_LCR, port->lcr); | |
943 | ||
944 | sdio_uart_release_func(port); | |
c43d8636 | 945 | return 0; |
6e418a9d NP |
946 | } |
947 | ||
60b33c13 | 948 | static int sdio_uart_tiocmget(struct tty_struct *tty) |
6e418a9d NP |
949 | { |
950 | struct sdio_uart_port *port = tty->driver_data; | |
951 | int result; | |
952 | ||
953 | result = sdio_uart_claim_func(port); | |
954 | if (!result) { | |
955 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
956 | sdio_uart_release_func(port); | |
957 | } | |
958 | ||
959 | return result; | |
960 | } | |
961 | ||
20b9d177 | 962 | static int sdio_uart_tiocmset(struct tty_struct *tty, |
6e418a9d NP |
963 | unsigned int set, unsigned int clear) |
964 | { | |
965 | struct sdio_uart_port *port = tty->driver_data; | |
966 | int result; | |
967 | ||
1e04b7ae | 968 | result = sdio_uart_claim_func(port); |
c271cf37 | 969 | if (!result) { |
6e418a9d NP |
970 | sdio_uart_update_mctrl(port, set, clear); |
971 | sdio_uart_release_func(port); | |
972 | } | |
973 | ||
974 | return result; | |
975 | } | |
976 | ||
201a50ba | 977 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 978 | { |
201a50ba | 979 | int i; |
5ed334a1 | 980 | |
201a50ba | 981 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 982 | "", "", ""); |
201a50ba | 983 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
984 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
985 | if (port) { | |
201a50ba | 986 | seq_printf(m, "%d: uart:SDIO", i); |
c271cf37 | 987 | if (capable(CAP_SYS_ADMIN)) { |
201a50ba | 988 | seq_printf(m, " tx:%d rx:%d", |
1e04b7ae | 989 | port->icount.tx, port->icount.rx); |
5ed334a1 | 990 | if (port->icount.frame) |
201a50ba | 991 | seq_printf(m, " fe:%d", |
1e04b7ae | 992 | port->icount.frame); |
5ed334a1 | 993 | if (port->icount.parity) |
201a50ba | 994 | seq_printf(m, " pe:%d", |
1e04b7ae | 995 | port->icount.parity); |
5ed334a1 | 996 | if (port->icount.brk) |
201a50ba | 997 | seq_printf(m, " brk:%d", |
1e04b7ae | 998 | port->icount.brk); |
5ed334a1 | 999 | if (port->icount.overrun) |
201a50ba | 1000 | seq_printf(m, " oe:%d", |
1e04b7ae | 1001 | port->icount.overrun); |
5ed334a1 | 1002 | if (port->icount.cts) |
201a50ba | 1003 | seq_printf(m, " cts:%d", |
1e04b7ae | 1004 | port->icount.cts); |
5ed334a1 | 1005 | if (port->icount.dsr) |
201a50ba | 1006 | seq_printf(m, " dsr:%d", |
1e04b7ae | 1007 | port->icount.dsr); |
5ed334a1 | 1008 | if (port->icount.rng) |
201a50ba | 1009 | seq_printf(m, " rng:%d", |
1e04b7ae | 1010 | port->icount.rng); |
5ed334a1 | 1011 | if (port->icount.dcd) |
201a50ba | 1012 | seq_printf(m, " dcd:%d", |
1e04b7ae | 1013 | port->icount.dcd); |
5ed334a1 | 1014 | } |
5ed334a1 | 1015 | sdio_uart_port_put(port); |
201a50ba | 1016 | seq_putc(m, '\n'); |
5ed334a1 NP |
1017 | } |
1018 | } | |
201a50ba AD |
1019 | return 0; |
1020 | } | |
5ed334a1 | 1021 | |
201a50ba AD |
1022 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
1023 | { | |
1024 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
1025 | } |
1026 | ||
201a50ba AD |
1027 | static const struct file_operations sdio_uart_proc_fops = { |
1028 | .owner = THIS_MODULE, | |
1029 | .open = sdio_uart_proc_open, | |
1030 | .read = seq_read, | |
1031 | .llseek = seq_lseek, | |
1032 | .release = single_release, | |
1033 | }; | |
1034 | ||
584abc37 AC |
1035 | static const struct tty_port_operations sdio_uart_port_ops = { |
1036 | .dtr_rts = uart_dtr_rts, | |
4b3b49bb | 1037 | .carrier_raised = uart_carrier_raised, |
584abc37 AC |
1038 | .shutdown = sdio_uart_shutdown, |
1039 | .activate = sdio_uart_activate, | |
e70c6771 | 1040 | .destruct = sdio_uart_port_destroy, |
584abc37 AC |
1041 | }; |
1042 | ||
6e418a9d NP |
1043 | static const struct tty_operations sdio_uart_ops = { |
1044 | .open = sdio_uart_open, | |
1045 | .close = sdio_uart_close, | |
1046 | .write = sdio_uart_write, | |
1047 | .write_room = sdio_uart_write_room, | |
1048 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1049 | .send_xchar = sdio_uart_send_xchar, | |
1050 | .throttle = sdio_uart_throttle, | |
1051 | .unthrottle = sdio_uart_unthrottle, | |
1052 | .set_termios = sdio_uart_set_termios, | |
584abc37 | 1053 | .hangup = sdio_uart_hangup, |
6e418a9d NP |
1054 | .break_ctl = sdio_uart_break_ctl, |
1055 | .tiocmget = sdio_uart_tiocmget, | |
1056 | .tiocmset = sdio_uart_tiocmset, | |
584abc37 AC |
1057 | .install = sdio_uart_install, |
1058 | .cleanup = sdio_uart_cleanup, | |
201a50ba | 1059 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1060 | }; |
1061 | ||
1062 | static struct tty_driver *sdio_uart_tty_driver; | |
1063 | ||
1064 | static int sdio_uart_probe(struct sdio_func *func, | |
1065 | const struct sdio_device_id *id) | |
1066 | { | |
1067 | struct sdio_uart_port *port; | |
1068 | int ret; | |
1069 | ||
1070 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1071 | if (!port) | |
1072 | return -ENOMEM; | |
1073 | ||
1074 | if (func->class == SDIO_CLASS_UART) { | |
a3c76eb9 | 1075 | pr_warning("%s: need info on UART class basic setup\n", |
6e418a9d NP |
1076 | sdio_func_id(func)); |
1077 | kfree(port); | |
1078 | return -ENOSYS; | |
1079 | } else if (func->class == SDIO_CLASS_GPS) { | |
1080 | /* | |
1081 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1082 | * and SUBTPL_RCVCAPS. | |
1083 | */ | |
1084 | struct sdio_func_tuple *tpl; | |
1085 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1086 | if (tpl->code != 0x91) | |
1087 | continue; | |
1088 | if (tpl->size < 10) | |
1089 | continue; | |
1090 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1091 | break; | |
1092 | } | |
1093 | if (!tpl) { | |
a3c76eb9 | 1094 | pr_warning( |
c271cf37 | 1095 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", |
6e418a9d NP |
1096 | sdio_func_id(func)); |
1097 | kfree(port); | |
1098 | return -EINVAL; | |
1099 | } | |
a3c76eb9 | 1100 | pr_debug("%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", |
6e418a9d NP |
1101 | sdio_func_id(func), tpl->data[2], tpl->data[3]); |
1102 | port->regs_offset = (tpl->data[4] << 0) | | |
1103 | (tpl->data[5] << 8) | | |
1104 | (tpl->data[6] << 16); | |
a3c76eb9 | 1105 | pr_debug("%s: regs offset = 0x%x\n", |
6e418a9d NP |
1106 | sdio_func_id(func), port->regs_offset); |
1107 | port->uartclk = tpl->data[7] * 115200; | |
1108 | if (port->uartclk == 0) | |
1109 | port->uartclk = 115200; | |
a3c76eb9 | 1110 | pr_debug("%s: clk %d baudcode %u 4800-div %u\n", |
6e418a9d NP |
1111 | sdio_func_id(func), port->uartclk, |
1112 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1113 | } else { | |
1114 | kfree(port); | |
1115 | return -EINVAL; | |
1116 | } | |
1117 | ||
1118 | port->func = func; | |
1119 | sdio_set_drvdata(func, port); | |
b5849b1a | 1120 | tty_port_init(&port->port); |
584abc37 | 1121 | port->port.ops = &sdio_uart_port_ops; |
6e418a9d NP |
1122 | |
1123 | ret = sdio_uart_add_port(port); | |
1124 | if (ret) { | |
1125 | kfree(port); | |
1126 | } else { | |
1127 | struct device *dev; | |
734cc178 JS |
1128 | dev = tty_port_register_device(&port->port, |
1129 | sdio_uart_tty_driver, port->index, &func->dev); | |
6e418a9d NP |
1130 | if (IS_ERR(dev)) { |
1131 | sdio_uart_port_remove(port); | |
1132 | ret = PTR_ERR(dev); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | return ret; | |
1137 | } | |
1138 | ||
1139 | static void sdio_uart_remove(struct sdio_func *func) | |
1140 | { | |
1141 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1142 | ||
1143 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1144 | sdio_uart_port_remove(port); | |
1145 | } | |
1146 | ||
1147 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1148 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1149 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1150 | { /* end: all zeroes */ }, | |
1151 | }; | |
1152 | ||
1153 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1154 | ||
1155 | static struct sdio_driver sdio_uart_driver = { | |
1156 | .probe = sdio_uart_probe, | |
1157 | .remove = sdio_uart_remove, | |
1158 | .name = "sdio_uart", | |
1159 | .id_table = sdio_uart_ids, | |
1160 | }; | |
1161 | ||
1162 | static int __init sdio_uart_init(void) | |
1163 | { | |
1164 | int ret; | |
1165 | struct tty_driver *tty_drv; | |
1166 | ||
1167 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1168 | if (!tty_drv) | |
1169 | return -ENOMEM; | |
1170 | ||
6e418a9d NP |
1171 | tty_drv->driver_name = "sdio_uart"; |
1172 | tty_drv->name = "ttySDIO"; | |
1173 | tty_drv->major = 0; /* dynamically allocated */ | |
1174 | tty_drv->minor_start = 0; | |
1175 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1176 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1177 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1178 | tty_drv->init_termios = tty_std_termios; | |
1179 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1180 | tty_drv->init_termios.c_ispeed = 4800; |
1181 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1182 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1183 | ||
1184 | ret = tty_register_driver(tty_drv); | |
1185 | if (ret) | |
1186 | goto err1; | |
1187 | ||
1188 | ret = sdio_register_driver(&sdio_uart_driver); | |
1189 | if (ret) | |
1190 | goto err2; | |
1191 | ||
1192 | return 0; | |
1193 | ||
1194 | err2: | |
1195 | tty_unregister_driver(tty_drv); | |
1196 | err1: | |
1197 | put_tty_driver(tty_drv); | |
1198 | return ret; | |
1199 | } | |
1200 | ||
1201 | static void __exit sdio_uart_exit(void) | |
1202 | { | |
1203 | sdio_unregister_driver(&sdio_uart_driver); | |
1204 | tty_unregister_driver(sdio_uart_tty_driver); | |
1205 | put_tty_driver(sdio_uart_tty_driver); | |
1206 | } | |
1207 | ||
1208 | module_init(sdio_uart_init); | |
1209 | module_exit(sdio_uart_exit); | |
1210 | ||
1211 | MODULE_AUTHOR("Nicolas Pitre"); | |
1212 | MODULE_LICENSE("GPL"); |