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1da177e4 LT |
1 | /* |
2 | * linux/drivers/serial/pxa.c | |
3 | * | |
4 | * Based on drivers/serial/8250.c by Russell King. | |
5 | * | |
6 | * Author: Nicolas Pitre | |
7 | * Created: Feb 20, 2003 | |
8 | * Copyright: (C) 2003 Monta Vista Software, Inc. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * Note 1: This driver is made separate from the already too overloaded | |
16 | * 8250.c because it needs some kirks of its own and that'll make it | |
17 | * easier to add DMA support. | |
18 | * | |
19 | * Note 2: I'm too sick of device allocation policies for serial ports. | |
20 | * If someone else wants to request an "official" allocation of major/minor | |
21 | * for this driver please be my guest. And don't forget that new hardware | |
22 | * to come from Intel might have more than 3 or 4 of those UARTs. Let's | |
23 | * hope for a better port registration and dynamic device allocation scheme | |
24 | * with the serial core maintainer satisfaction to appear soon. | |
25 | */ | |
26 | ||
27 | #include <linux/config.h> | |
28 | ||
29 | #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
30 | #define SUPPORT_SYSRQ | |
31 | #endif | |
32 | ||
33 | #include <linux/module.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/console.h> | |
37 | #include <linux/sysrq.h> | |
38 | #include <linux/serial_reg.h> | |
39 | #include <linux/circ_buf.h> | |
40 | #include <linux/delay.h> | |
41 | #include <linux/interrupt.h> | |
d052d1be | 42 | #include <linux/platform_device.h> |
1da177e4 LT |
43 | #include <linux/tty.h> |
44 | #include <linux/tty_flip.h> | |
45 | #include <linux/serial_core.h> | |
46 | ||
47 | #include <asm/io.h> | |
48 | #include <asm/hardware.h> | |
49 | #include <asm/irq.h> | |
50 | #include <asm/arch/pxa-regs.h> | |
51 | ||
52 | ||
53 | struct uart_pxa_port { | |
54 | struct uart_port port; | |
55 | unsigned char ier; | |
56 | unsigned char lcr; | |
57 | unsigned char mcr; | |
58 | unsigned int lsr_break_flag; | |
59 | unsigned int cken; | |
60 | char *name; | |
61 | }; | |
62 | ||
63 | static inline unsigned int serial_in(struct uart_pxa_port *up, int offset) | |
64 | { | |
65 | offset <<= 2; | |
66 | return readl(up->port.membase + offset); | |
67 | } | |
68 | ||
69 | static inline void serial_out(struct uart_pxa_port *up, int offset, int value) | |
70 | { | |
71 | offset <<= 2; | |
72 | writel(value, up->port.membase + offset); | |
73 | } | |
74 | ||
75 | static void serial_pxa_enable_ms(struct uart_port *port) | |
76 | { | |
77 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
78 | ||
79 | up->ier |= UART_IER_MSI; | |
80 | serial_out(up, UART_IER, up->ier); | |
81 | } | |
82 | ||
b129a8cc | 83 | static void serial_pxa_stop_tx(struct uart_port *port) |
1da177e4 LT |
84 | { |
85 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
86 | ||
87 | if (up->ier & UART_IER_THRI) { | |
88 | up->ier &= ~UART_IER_THRI; | |
89 | serial_out(up, UART_IER, up->ier); | |
90 | } | |
91 | } | |
92 | ||
93 | static void serial_pxa_stop_rx(struct uart_port *port) | |
94 | { | |
95 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
96 | ||
97 | up->ier &= ~UART_IER_RLSI; | |
98 | up->port.read_status_mask &= ~UART_LSR_DR; | |
99 | serial_out(up, UART_IER, up->ier); | |
100 | } | |
101 | ||
102 | static inline void | |
103 | receive_chars(struct uart_pxa_port *up, int *status, struct pt_regs *regs) | |
104 | { | |
105 | struct tty_struct *tty = up->port.info->tty; | |
106 | unsigned int ch, flag; | |
107 | int max_count = 256; | |
108 | ||
109 | do { | |
1da177e4 LT |
110 | ch = serial_in(up, UART_RX); |
111 | flag = TTY_NORMAL; | |
112 | up->port.icount.rx++; | |
113 | ||
114 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
115 | UART_LSR_FE | UART_LSR_OE))) { | |
116 | /* | |
117 | * For statistics only | |
118 | */ | |
119 | if (*status & UART_LSR_BI) { | |
120 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
121 | up->port.icount.brk++; | |
122 | /* | |
123 | * We do the SysRQ and SAK checking | |
124 | * here because otherwise the break | |
125 | * may get masked by ignore_status_mask | |
126 | * or read_status_mask. | |
127 | */ | |
128 | if (uart_handle_break(&up->port)) | |
129 | goto ignore_char; | |
130 | } else if (*status & UART_LSR_PE) | |
131 | up->port.icount.parity++; | |
132 | else if (*status & UART_LSR_FE) | |
133 | up->port.icount.frame++; | |
134 | if (*status & UART_LSR_OE) | |
135 | up->port.icount.overrun++; | |
136 | ||
137 | /* | |
138 | * Mask off conditions which should be ignored. | |
139 | */ | |
140 | *status &= up->port.read_status_mask; | |
141 | ||
142 | #ifdef CONFIG_SERIAL_PXA_CONSOLE | |
143 | if (up->port.line == up->port.cons->index) { | |
144 | /* Recover the break flag from console xmit */ | |
145 | *status |= up->lsr_break_flag; | |
146 | up->lsr_break_flag = 0; | |
147 | } | |
148 | #endif | |
149 | if (*status & UART_LSR_BI) { | |
150 | flag = TTY_BREAK; | |
151 | } else if (*status & UART_LSR_PE) | |
152 | flag = TTY_PARITY; | |
153 | else if (*status & UART_LSR_FE) | |
154 | flag = TTY_FRAME; | |
155 | } | |
05ab3014 | 156 | |
1da177e4 LT |
157 | if (uart_handle_sysrq_char(&up->port, ch, regs)) |
158 | goto ignore_char; | |
05ab3014 RK |
159 | |
160 | uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); | |
161 | ||
1da177e4 LT |
162 | ignore_char: |
163 | *status = serial_in(up, UART_LSR); | |
164 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
165 | tty_flip_buffer_push(tty); | |
166 | } | |
167 | ||
168 | static void transmit_chars(struct uart_pxa_port *up) | |
169 | { | |
170 | struct circ_buf *xmit = &up->port.info->xmit; | |
171 | int count; | |
172 | ||
173 | if (up->port.x_char) { | |
174 | serial_out(up, UART_TX, up->port.x_char); | |
175 | up->port.icount.tx++; | |
176 | up->port.x_char = 0; | |
177 | return; | |
178 | } | |
179 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { | |
b129a8cc | 180 | serial_pxa_stop_tx(&up->port); |
1da177e4 LT |
181 | return; |
182 | } | |
183 | ||
184 | count = up->port.fifosize / 2; | |
185 | do { | |
186 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
187 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
188 | up->port.icount.tx++; | |
189 | if (uart_circ_empty(xmit)) | |
190 | break; | |
191 | } while (--count > 0); | |
192 | ||
193 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
194 | uart_write_wakeup(&up->port); | |
195 | ||
196 | ||
197 | if (uart_circ_empty(xmit)) | |
b129a8cc | 198 | serial_pxa_stop_tx(&up->port); |
1da177e4 LT |
199 | } |
200 | ||
b129a8cc | 201 | static void serial_pxa_start_tx(struct uart_port *port) |
1da177e4 LT |
202 | { |
203 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
204 | ||
205 | if (!(up->ier & UART_IER_THRI)) { | |
206 | up->ier |= UART_IER_THRI; | |
207 | serial_out(up, UART_IER, up->ier); | |
208 | } | |
209 | } | |
210 | ||
211 | static inline void check_modem_status(struct uart_pxa_port *up) | |
212 | { | |
213 | int status; | |
214 | ||
215 | status = serial_in(up, UART_MSR); | |
216 | ||
217 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
218 | return; | |
219 | ||
220 | if (status & UART_MSR_TERI) | |
221 | up->port.icount.rng++; | |
222 | if (status & UART_MSR_DDSR) | |
223 | up->port.icount.dsr++; | |
224 | if (status & UART_MSR_DDCD) | |
225 | uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); | |
226 | if (status & UART_MSR_DCTS) | |
227 | uart_handle_cts_change(&up->port, status & UART_MSR_CTS); | |
228 | ||
229 | wake_up_interruptible(&up->port.info->delta_msr_wait); | |
230 | } | |
231 | ||
232 | /* | |
233 | * This handles the interrupt from one port. | |
234 | */ | |
235 | static inline irqreturn_t | |
236 | serial_pxa_irq(int irq, void *dev_id, struct pt_regs *regs) | |
237 | { | |
238 | struct uart_pxa_port *up = (struct uart_pxa_port *)dev_id; | |
239 | unsigned int iir, lsr; | |
240 | ||
241 | iir = serial_in(up, UART_IIR); | |
242 | if (iir & UART_IIR_NO_INT) | |
243 | return IRQ_NONE; | |
244 | lsr = serial_in(up, UART_LSR); | |
245 | if (lsr & UART_LSR_DR) | |
246 | receive_chars(up, &lsr, regs); | |
247 | check_modem_status(up); | |
248 | if (lsr & UART_LSR_THRE) | |
249 | transmit_chars(up); | |
250 | return IRQ_HANDLED; | |
251 | } | |
252 | ||
253 | static unsigned int serial_pxa_tx_empty(struct uart_port *port) | |
254 | { | |
255 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
256 | unsigned long flags; | |
257 | unsigned int ret; | |
258 | ||
259 | spin_lock_irqsave(&up->port.lock, flags); | |
260 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; | |
261 | spin_unlock_irqrestore(&up->port.lock, flags); | |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
266 | static unsigned int serial_pxa_get_mctrl(struct uart_port *port) | |
267 | { | |
268 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
1da177e4 LT |
269 | unsigned char status; |
270 | unsigned int ret; | |
271 | ||
1da177e4 | 272 | status = serial_in(up, UART_MSR); |
1da177e4 LT |
273 | |
274 | ret = 0; | |
275 | if (status & UART_MSR_DCD) | |
276 | ret |= TIOCM_CAR; | |
277 | if (status & UART_MSR_RI) | |
278 | ret |= TIOCM_RNG; | |
279 | if (status & UART_MSR_DSR) | |
280 | ret |= TIOCM_DSR; | |
281 | if (status & UART_MSR_CTS) | |
282 | ret |= TIOCM_CTS; | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
287 | { | |
288 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
289 | unsigned char mcr = 0; | |
290 | ||
291 | if (mctrl & TIOCM_RTS) | |
292 | mcr |= UART_MCR_RTS; | |
293 | if (mctrl & TIOCM_DTR) | |
294 | mcr |= UART_MCR_DTR; | |
295 | if (mctrl & TIOCM_OUT1) | |
296 | mcr |= UART_MCR_OUT1; | |
297 | if (mctrl & TIOCM_OUT2) | |
298 | mcr |= UART_MCR_OUT2; | |
299 | if (mctrl & TIOCM_LOOP) | |
300 | mcr |= UART_MCR_LOOP; | |
301 | ||
302 | mcr |= up->mcr; | |
303 | ||
304 | serial_out(up, UART_MCR, mcr); | |
305 | } | |
306 | ||
307 | static void serial_pxa_break_ctl(struct uart_port *port, int break_state) | |
308 | { | |
309 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
310 | unsigned long flags; | |
311 | ||
312 | spin_lock_irqsave(&up->port.lock, flags); | |
313 | if (break_state == -1) | |
314 | up->lcr |= UART_LCR_SBC; | |
315 | else | |
316 | up->lcr &= ~UART_LCR_SBC; | |
317 | serial_out(up, UART_LCR, up->lcr); | |
318 | spin_unlock_irqrestore(&up->port.lock, flags); | |
319 | } | |
320 | ||
321 | #if 0 | |
322 | static void serial_pxa_dma_init(struct pxa_uart *up) | |
323 | { | |
324 | up->rxdma = | |
325 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up); | |
326 | if (up->rxdma < 0) | |
327 | goto out; | |
328 | up->txdma = | |
329 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up); | |
330 | if (up->txdma < 0) | |
331 | goto err_txdma; | |
332 | up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL); | |
333 | if (!up->dmadesc) | |
334 | goto err_alloc; | |
335 | ||
336 | /* ... */ | |
337 | err_alloc: | |
338 | pxa_free_dma(up->txdma); | |
339 | err_rxdma: | |
340 | pxa_free_dma(up->rxdma); | |
341 | out: | |
342 | return; | |
343 | } | |
344 | #endif | |
345 | ||
346 | static int serial_pxa_startup(struct uart_port *port) | |
347 | { | |
348 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
349 | unsigned long flags; | |
350 | int retval; | |
351 | ||
d9e29649 MR |
352 | if (port->line == 3) /* HWUART */ |
353 | up->mcr |= UART_MCR_AFE; | |
354 | else | |
f02aa3f9 | 355 | up->mcr = 0; |
1da177e4 LT |
356 | |
357 | /* | |
358 | * Allocate the IRQ | |
359 | */ | |
360 | retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up); | |
361 | if (retval) | |
362 | return retval; | |
363 | ||
364 | /* | |
365 | * Clear the FIFO buffers and disable them. | |
366 | * (they will be reenabled in set_termios()) | |
367 | */ | |
368 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); | |
369 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
370 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); | |
371 | serial_out(up, UART_FCR, 0); | |
372 | ||
373 | /* | |
374 | * Clear the interrupt registers. | |
375 | */ | |
376 | (void) serial_in(up, UART_LSR); | |
377 | (void) serial_in(up, UART_RX); | |
378 | (void) serial_in(up, UART_IIR); | |
379 | (void) serial_in(up, UART_MSR); | |
380 | ||
381 | /* | |
382 | * Now, initialize the UART | |
383 | */ | |
384 | serial_out(up, UART_LCR, UART_LCR_WLEN8); | |
385 | ||
386 | spin_lock_irqsave(&up->port.lock, flags); | |
387 | up->port.mctrl |= TIOCM_OUT2; | |
388 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); | |
389 | spin_unlock_irqrestore(&up->port.lock, flags); | |
390 | ||
391 | /* | |
392 | * Finally, enable interrupts. Note: Modem status interrupts | |
393 | * are set via set_termios(), which will be occuring imminently | |
394 | * anyway, so we don't enable them here. | |
395 | */ | |
396 | up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; | |
397 | serial_out(up, UART_IER, up->ier); | |
398 | ||
399 | /* | |
400 | * And clear the interrupt registers again for luck. | |
401 | */ | |
402 | (void) serial_in(up, UART_LSR); | |
403 | (void) serial_in(up, UART_RX); | |
404 | (void) serial_in(up, UART_IIR); | |
405 | (void) serial_in(up, UART_MSR); | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | static void serial_pxa_shutdown(struct uart_port *port) | |
411 | { | |
412 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
413 | unsigned long flags; | |
414 | ||
415 | free_irq(up->port.irq, up); | |
416 | ||
417 | /* | |
418 | * Disable interrupts from this port | |
419 | */ | |
420 | up->ier = 0; | |
421 | serial_out(up, UART_IER, 0); | |
422 | ||
423 | spin_lock_irqsave(&up->port.lock, flags); | |
424 | up->port.mctrl &= ~TIOCM_OUT2; | |
425 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); | |
426 | spin_unlock_irqrestore(&up->port.lock, flags); | |
427 | ||
428 | /* | |
429 | * Disable break condition and FIFOs | |
430 | */ | |
431 | serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); | |
432 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
433 | UART_FCR_CLEAR_RCVR | | |
434 | UART_FCR_CLEAR_XMIT); | |
435 | serial_out(up, UART_FCR, 0); | |
436 | } | |
437 | ||
438 | static void | |
439 | serial_pxa_set_termios(struct uart_port *port, struct termios *termios, | |
440 | struct termios *old) | |
441 | { | |
442 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
443 | unsigned char cval, fcr = 0; | |
444 | unsigned long flags; | |
445 | unsigned int baud, quot; | |
446 | ||
447 | switch (termios->c_cflag & CSIZE) { | |
448 | case CS5: | |
0a8b80c5 | 449 | cval = UART_LCR_WLEN5; |
1da177e4 LT |
450 | break; |
451 | case CS6: | |
0a8b80c5 | 452 | cval = UART_LCR_WLEN6; |
1da177e4 LT |
453 | break; |
454 | case CS7: | |
0a8b80c5 | 455 | cval = UART_LCR_WLEN7; |
1da177e4 LT |
456 | break; |
457 | default: | |
458 | case CS8: | |
0a8b80c5 | 459 | cval = UART_LCR_WLEN8; |
1da177e4 LT |
460 | break; |
461 | } | |
462 | ||
463 | if (termios->c_cflag & CSTOPB) | |
0a8b80c5 | 464 | cval |= UART_LCR_STOP; |
1da177e4 LT |
465 | if (termios->c_cflag & PARENB) |
466 | cval |= UART_LCR_PARITY; | |
467 | if (!(termios->c_cflag & PARODD)) | |
468 | cval |= UART_LCR_EPAR; | |
469 | ||
470 | /* | |
471 | * Ask the core to calculate the divisor for us. | |
472 | */ | |
473 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
474 | quot = uart_get_divisor(port, baud); | |
475 | ||
476 | if ((up->port.uartclk / quot) < (2400 * 16)) | |
477 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1; | |
d9e29649 | 478 | else if ((up->port.uartclk / quot) < (230400 * 16)) |
1da177e4 | 479 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8; |
d9e29649 MR |
480 | else |
481 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32; | |
1da177e4 LT |
482 | |
483 | /* | |
484 | * Ok, we're now changing the port state. Do it with | |
485 | * interrupts disabled. | |
486 | */ | |
487 | spin_lock_irqsave(&up->port.lock, flags); | |
488 | ||
489 | /* | |
490 | * Ensure the port will be enabled. | |
491 | * This is required especially for serial console. | |
492 | */ | |
493 | up->ier |= IER_UUE; | |
494 | ||
495 | /* | |
496 | * Update the per-port timeout. | |
497 | */ | |
e6158b4a | 498 | uart_update_timeout(port, termios->c_cflag, baud); |
1da177e4 LT |
499 | |
500 | up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
501 | if (termios->c_iflag & INPCK) | |
502 | up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
503 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
504 | up->port.read_status_mask |= UART_LSR_BI; | |
505 | ||
506 | /* | |
507 | * Characters to ignore | |
508 | */ | |
509 | up->port.ignore_status_mask = 0; | |
510 | if (termios->c_iflag & IGNPAR) | |
511 | up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
512 | if (termios->c_iflag & IGNBRK) { | |
513 | up->port.ignore_status_mask |= UART_LSR_BI; | |
514 | /* | |
515 | * If we're ignoring parity and break indicators, | |
516 | * ignore overruns too (for real raw support). | |
517 | */ | |
518 | if (termios->c_iflag & IGNPAR) | |
519 | up->port.ignore_status_mask |= UART_LSR_OE; | |
520 | } | |
521 | ||
522 | /* | |
523 | * ignore all characters if CREAD is not set | |
524 | */ | |
525 | if ((termios->c_cflag & CREAD) == 0) | |
526 | up->port.ignore_status_mask |= UART_LSR_DR; | |
527 | ||
528 | /* | |
529 | * CTS flow control flag and modem status interrupts | |
530 | */ | |
531 | up->ier &= ~UART_IER_MSI; | |
532 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
533 | up->ier |= UART_IER_MSI; | |
534 | ||
535 | serial_out(up, UART_IER, up->ier); | |
536 | ||
537 | serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ | |
538 | serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ | |
539 | serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ | |
540 | serial_out(up, UART_LCR, cval); /* reset DLAB */ | |
541 | up->lcr = cval; /* Save LCR */ | |
542 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); | |
543 | serial_out(up, UART_FCR, fcr); | |
544 | spin_unlock_irqrestore(&up->port.lock, flags); | |
545 | } | |
546 | ||
547 | static void | |
548 | serial_pxa_pm(struct uart_port *port, unsigned int state, | |
549 | unsigned int oldstate) | |
550 | { | |
551 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
552 | pxa_set_cken(up->cken, !state); | |
553 | if (!state) | |
554 | udelay(1); | |
555 | } | |
556 | ||
557 | static void serial_pxa_release_port(struct uart_port *port) | |
558 | { | |
559 | } | |
560 | ||
561 | static int serial_pxa_request_port(struct uart_port *port) | |
562 | { | |
563 | return 0; | |
564 | } | |
565 | ||
566 | static void serial_pxa_config_port(struct uart_port *port, int flags) | |
567 | { | |
568 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
569 | up->port.type = PORT_PXA; | |
570 | } | |
571 | ||
572 | static int | |
573 | serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser) | |
574 | { | |
575 | /* we don't want the core code to modify any port params */ | |
576 | return -EINVAL; | |
577 | } | |
578 | ||
579 | static const char * | |
580 | serial_pxa_type(struct uart_port *port) | |
581 | { | |
582 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
583 | return up->name; | |
584 | } | |
585 | ||
586 | #ifdef CONFIG_SERIAL_PXA_CONSOLE | |
587 | ||
2d93486c VS |
588 | static struct uart_pxa_port serial_pxa_ports[]; |
589 | static struct uart_driver serial_pxa_reg; | |
1da177e4 LT |
590 | |
591 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) | |
592 | ||
593 | /* | |
594 | * Wait for transmitter & holding register to empty | |
595 | */ | |
596 | static inline void wait_for_xmitr(struct uart_pxa_port *up) | |
597 | { | |
598 | unsigned int status, tmout = 10000; | |
599 | ||
600 | /* Wait up to 10ms for the character(s) to be sent. */ | |
601 | do { | |
602 | status = serial_in(up, UART_LSR); | |
603 | ||
604 | if (status & UART_LSR_BI) | |
605 | up->lsr_break_flag = UART_LSR_BI; | |
606 | ||
607 | if (--tmout == 0) | |
608 | break; | |
609 | udelay(1); | |
610 | } while ((status & BOTH_EMPTY) != BOTH_EMPTY); | |
611 | ||
612 | /* Wait up to 1s for flow control if necessary */ | |
613 | if (up->port.flags & UPF_CONS_FLOW) { | |
614 | tmout = 1000000; | |
615 | while (--tmout && | |
616 | ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) | |
617 | udelay(1); | |
618 | } | |
619 | } | |
620 | ||
d358788f RK |
621 | static void serial_pxa_console_putchar(struct uart_port *port, int ch) |
622 | { | |
623 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
624 | ||
625 | wait_for_xmitr(up); | |
626 | serial_out(up, UART_TX, ch); | |
627 | } | |
628 | ||
1da177e4 LT |
629 | /* |
630 | * Print a string to the serial port trying not to disturb | |
631 | * any possible real use of the port... | |
632 | * | |
633 | * The console_lock must be held when we get here. | |
634 | */ | |
635 | static void | |
636 | serial_pxa_console_write(struct console *co, const char *s, unsigned int count) | |
637 | { | |
638 | struct uart_pxa_port *up = &serial_pxa_ports[co->index]; | |
639 | unsigned int ier; | |
1da177e4 LT |
640 | |
641 | /* | |
f02aa3f9 | 642 | * First save the IER then disable the interrupts |
1da177e4 LT |
643 | */ |
644 | ier = serial_in(up, UART_IER); | |
645 | serial_out(up, UART_IER, UART_IER_UUE); | |
646 | ||
d358788f | 647 | uart_console_write(&up->port, s, count, serial_pxa_console_putchar); |
1da177e4 LT |
648 | |
649 | /* | |
650 | * Finally, wait for transmitter to become empty | |
651 | * and restore the IER | |
652 | */ | |
653 | wait_for_xmitr(up); | |
654 | serial_out(up, UART_IER, ier); | |
655 | } | |
656 | ||
657 | static int __init | |
658 | serial_pxa_console_setup(struct console *co, char *options) | |
659 | { | |
660 | struct uart_pxa_port *up; | |
661 | int baud = 9600; | |
662 | int bits = 8; | |
663 | int parity = 'n'; | |
664 | int flow = 'n'; | |
665 | ||
666 | if (co->index == -1 || co->index >= serial_pxa_reg.nr) | |
667 | co->index = 0; | |
668 | up = &serial_pxa_ports[co->index]; | |
669 | ||
670 | if (options) | |
671 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
672 | ||
673 | return uart_set_options(&up->port, co, baud, parity, bits, flow); | |
674 | } | |
675 | ||
676 | static struct console serial_pxa_console = { | |
677 | .name = "ttyS", | |
678 | .write = serial_pxa_console_write, | |
679 | .device = uart_console_device, | |
680 | .setup = serial_pxa_console_setup, | |
681 | .flags = CON_PRINTBUFFER, | |
682 | .index = -1, | |
683 | .data = &serial_pxa_reg, | |
684 | }; | |
685 | ||
686 | static int __init | |
687 | serial_pxa_console_init(void) | |
688 | { | |
689 | register_console(&serial_pxa_console); | |
690 | return 0; | |
691 | } | |
692 | ||
693 | console_initcall(serial_pxa_console_init); | |
694 | ||
695 | #define PXA_CONSOLE &serial_pxa_console | |
696 | #else | |
697 | #define PXA_CONSOLE NULL | |
698 | #endif | |
699 | ||
700 | struct uart_ops serial_pxa_pops = { | |
701 | .tx_empty = serial_pxa_tx_empty, | |
702 | .set_mctrl = serial_pxa_set_mctrl, | |
703 | .get_mctrl = serial_pxa_get_mctrl, | |
704 | .stop_tx = serial_pxa_stop_tx, | |
705 | .start_tx = serial_pxa_start_tx, | |
706 | .stop_rx = serial_pxa_stop_rx, | |
707 | .enable_ms = serial_pxa_enable_ms, | |
708 | .break_ctl = serial_pxa_break_ctl, | |
709 | .startup = serial_pxa_startup, | |
710 | .shutdown = serial_pxa_shutdown, | |
711 | .set_termios = serial_pxa_set_termios, | |
712 | .pm = serial_pxa_pm, | |
713 | .type = serial_pxa_type, | |
714 | .release_port = serial_pxa_release_port, | |
715 | .request_port = serial_pxa_request_port, | |
716 | .config_port = serial_pxa_config_port, | |
717 | .verify_port = serial_pxa_verify_port, | |
718 | }; | |
719 | ||
720 | static struct uart_pxa_port serial_pxa_ports[] = { | |
721 | { /* FFUART */ | |
722 | .name = "FFUART", | |
723 | .cken = CKEN6_FFUART, | |
724 | .port = { | |
725 | .type = PORT_PXA, | |
726 | .iotype = UPIO_MEM, | |
727 | .membase = (void *)&FFUART, | |
728 | .mapbase = __PREG(FFUART), | |
729 | .irq = IRQ_FFUART, | |
730 | .uartclk = 921600 * 16, | |
731 | .fifosize = 64, | |
732 | .ops = &serial_pxa_pops, | |
733 | .line = 0, | |
734 | }, | |
735 | }, { /* BTUART */ | |
736 | .name = "BTUART", | |
737 | .cken = CKEN7_BTUART, | |
738 | .port = { | |
739 | .type = PORT_PXA, | |
740 | .iotype = UPIO_MEM, | |
741 | .membase = (void *)&BTUART, | |
742 | .mapbase = __PREG(BTUART), | |
743 | .irq = IRQ_BTUART, | |
744 | .uartclk = 921600 * 16, | |
745 | .fifosize = 64, | |
746 | .ops = &serial_pxa_pops, | |
747 | .line = 1, | |
748 | }, | |
749 | }, { /* STUART */ | |
750 | .name = "STUART", | |
751 | .cken = CKEN5_STUART, | |
752 | .port = { | |
753 | .type = PORT_PXA, | |
754 | .iotype = UPIO_MEM, | |
755 | .membase = (void *)&STUART, | |
756 | .mapbase = __PREG(STUART), | |
757 | .irq = IRQ_STUART, | |
758 | .uartclk = 921600 * 16, | |
759 | .fifosize = 64, | |
760 | .ops = &serial_pxa_pops, | |
761 | .line = 2, | |
762 | }, | |
d9e29649 MR |
763 | }, { /* HWUART */ |
764 | .name = "HWUART", | |
765 | .cken = CKEN4_HWUART, | |
766 | .port = { | |
767 | .type = PORT_PXA, | |
768 | .iotype = UPIO_MEM, | |
769 | .membase = (void *)&HWUART, | |
770 | .mapbase = __PREG(HWUART), | |
771 | .irq = IRQ_HWUART, | |
772 | .uartclk = 921600 * 16, | |
773 | .fifosize = 64, | |
774 | .ops = &serial_pxa_pops, | |
775 | .line = 3, | |
776 | }, | |
1da177e4 LT |
777 | } |
778 | }; | |
779 | ||
780 | static struct uart_driver serial_pxa_reg = { | |
781 | .owner = THIS_MODULE, | |
782 | .driver_name = "PXA serial", | |
1da177e4 LT |
783 | .dev_name = "ttyS", |
784 | .major = TTY_MAJOR, | |
785 | .minor = 64, | |
786 | .nr = ARRAY_SIZE(serial_pxa_ports), | |
787 | .cons = PXA_CONSOLE, | |
788 | }; | |
789 | ||
3ae5eaec | 790 | static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 791 | { |
3ae5eaec | 792 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 793 | |
9480e307 | 794 | if (sport) |
1da177e4 LT |
795 | uart_suspend_port(&serial_pxa_reg, &sport->port); |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
3ae5eaec | 800 | static int serial_pxa_resume(struct platform_device *dev) |
1da177e4 | 801 | { |
3ae5eaec | 802 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 803 | |
9480e307 | 804 | if (sport) |
1da177e4 LT |
805 | uart_resume_port(&serial_pxa_reg, &sport->port); |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
3ae5eaec | 810 | static int serial_pxa_probe(struct platform_device *dev) |
1da177e4 | 811 | { |
3ae5eaec | 812 | serial_pxa_ports[dev->id].port.dev = &dev->dev; |
1da177e4 | 813 | uart_add_one_port(&serial_pxa_reg, &serial_pxa_ports[dev->id].port); |
3ae5eaec | 814 | platform_set_drvdata(dev, &serial_pxa_ports[dev->id]); |
1da177e4 LT |
815 | return 0; |
816 | } | |
817 | ||
3ae5eaec | 818 | static int serial_pxa_remove(struct platform_device *dev) |
1da177e4 | 819 | { |
3ae5eaec | 820 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 821 | |
3ae5eaec | 822 | platform_set_drvdata(dev, NULL); |
1da177e4 LT |
823 | |
824 | if (sport) | |
825 | uart_remove_one_port(&serial_pxa_reg, &sport->port); | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
3ae5eaec | 830 | static struct platform_driver serial_pxa_driver = { |
1da177e4 LT |
831 | .probe = serial_pxa_probe, |
832 | .remove = serial_pxa_remove, | |
833 | ||
834 | .suspend = serial_pxa_suspend, | |
835 | .resume = serial_pxa_resume, | |
3ae5eaec RK |
836 | .driver = { |
837 | .name = "pxa2xx-uart", | |
838 | }, | |
1da177e4 LT |
839 | }; |
840 | ||
841 | int __init serial_pxa_init(void) | |
842 | { | |
843 | int ret; | |
844 | ||
845 | ret = uart_register_driver(&serial_pxa_reg); | |
846 | if (ret != 0) | |
847 | return ret; | |
848 | ||
3ae5eaec | 849 | ret = platform_driver_register(&serial_pxa_driver); |
1da177e4 LT |
850 | if (ret != 0) |
851 | uart_unregister_driver(&serial_pxa_reg); | |
852 | ||
853 | return ret; | |
854 | } | |
855 | ||
856 | void __exit serial_pxa_exit(void) | |
857 | { | |
3ae5eaec | 858 | platform_driver_unregister(&serial_pxa_driver); |
1da177e4 LT |
859 | uart_unregister_driver(&serial_pxa_reg); |
860 | } | |
861 | ||
862 | module_init(serial_pxa_init); | |
863 | module_exit(serial_pxa_exit); | |
864 | ||
865 | MODULE_LICENSE("GPL"); | |
866 |