Commit | Line | Data |
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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 | ||
1da177e4 LT |
27 | |
28 | #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
29 | #define SUPPORT_SYSRQ | |
30 | #endif | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/ioport.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/console.h> | |
36 | #include <linux/sysrq.h> | |
37 | #include <linux/serial_reg.h> | |
38 | #include <linux/circ_buf.h> | |
39 | #include <linux/delay.h> | |
40 | #include <linux/interrupt.h> | |
d052d1be | 41 | #include <linux/platform_device.h> |
1da177e4 LT |
42 | #include <linux/tty.h> |
43 | #include <linux/tty_flip.h> | |
44 | #include <linux/serial_core.h> | |
b049bd9d | 45 | #include <linux/clk.h> |
1da177e4 LT |
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; | |
b049bd9d | 59 | struct clk *clk; |
1da177e4 LT |
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 | ||
7d12e780 | 102 | static inline void receive_chars(struct uart_pxa_port *up, int *status) |
1da177e4 | 103 | { |
a88487c7 | 104 | struct tty_struct *tty = up->port.info->port.tty; |
1da177e4 LT |
105 | unsigned int ch, flag; |
106 | int max_count = 256; | |
107 | ||
108 | do { | |
1da177e4 LT |
109 | ch = serial_in(up, UART_RX); |
110 | flag = TTY_NORMAL; | |
111 | up->port.icount.rx++; | |
112 | ||
113 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
114 | UART_LSR_FE | UART_LSR_OE))) { | |
115 | /* | |
116 | * For statistics only | |
117 | */ | |
118 | if (*status & UART_LSR_BI) { | |
119 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
120 | up->port.icount.brk++; | |
121 | /* | |
122 | * We do the SysRQ and SAK checking | |
123 | * here because otherwise the break | |
124 | * may get masked by ignore_status_mask | |
125 | * or read_status_mask. | |
126 | */ | |
127 | if (uart_handle_break(&up->port)) | |
128 | goto ignore_char; | |
129 | } else if (*status & UART_LSR_PE) | |
130 | up->port.icount.parity++; | |
131 | else if (*status & UART_LSR_FE) | |
132 | up->port.icount.frame++; | |
133 | if (*status & UART_LSR_OE) | |
134 | up->port.icount.overrun++; | |
135 | ||
136 | /* | |
137 | * Mask off conditions which should be ignored. | |
138 | */ | |
139 | *status &= up->port.read_status_mask; | |
140 | ||
141 | #ifdef CONFIG_SERIAL_PXA_CONSOLE | |
142 | if (up->port.line == up->port.cons->index) { | |
143 | /* Recover the break flag from console xmit */ | |
144 | *status |= up->lsr_break_flag; | |
145 | up->lsr_break_flag = 0; | |
146 | } | |
147 | #endif | |
148 | if (*status & UART_LSR_BI) { | |
149 | flag = TTY_BREAK; | |
150 | } else if (*status & UART_LSR_PE) | |
151 | flag = TTY_PARITY; | |
152 | else if (*status & UART_LSR_FE) | |
153 | flag = TTY_FRAME; | |
154 | } | |
05ab3014 | 155 | |
7d12e780 | 156 | if (uart_handle_sysrq_char(&up->port, ch)) |
1da177e4 | 157 | goto ignore_char; |
05ab3014 RK |
158 | |
159 | uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); | |
160 | ||
1da177e4 LT |
161 | ignore_char: |
162 | *status = serial_in(up, UART_LSR); | |
163 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
164 | tty_flip_buffer_push(tty); | |
165 | } | |
166 | ||
167 | static void transmit_chars(struct uart_pxa_port *up) | |
168 | { | |
169 | struct circ_buf *xmit = &up->port.info->xmit; | |
170 | int count; | |
171 | ||
172 | if (up->port.x_char) { | |
173 | serial_out(up, UART_TX, up->port.x_char); | |
174 | up->port.icount.tx++; | |
175 | up->port.x_char = 0; | |
176 | return; | |
177 | } | |
178 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { | |
b129a8cc | 179 | serial_pxa_stop_tx(&up->port); |
1da177e4 LT |
180 | return; |
181 | } | |
182 | ||
183 | count = up->port.fifosize / 2; | |
184 | do { | |
185 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
186 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
187 | up->port.icount.tx++; | |
188 | if (uart_circ_empty(xmit)) | |
189 | break; | |
190 | } while (--count > 0); | |
191 | ||
192 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
193 | uart_write_wakeup(&up->port); | |
194 | ||
195 | ||
196 | if (uart_circ_empty(xmit)) | |
b129a8cc | 197 | serial_pxa_stop_tx(&up->port); |
1da177e4 LT |
198 | } |
199 | ||
b129a8cc | 200 | static void serial_pxa_start_tx(struct uart_port *port) |
1da177e4 LT |
201 | { |
202 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
203 | ||
204 | if (!(up->ier & UART_IER_THRI)) { | |
205 | up->ier |= UART_IER_THRI; | |
206 | serial_out(up, UART_IER, up->ier); | |
207 | } | |
208 | } | |
209 | ||
210 | static inline void check_modem_status(struct uart_pxa_port *up) | |
211 | { | |
212 | int status; | |
213 | ||
214 | status = serial_in(up, UART_MSR); | |
215 | ||
216 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
217 | return; | |
218 | ||
219 | if (status & UART_MSR_TERI) | |
220 | up->port.icount.rng++; | |
221 | if (status & UART_MSR_DDSR) | |
222 | up->port.icount.dsr++; | |
223 | if (status & UART_MSR_DDCD) | |
224 | uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); | |
225 | if (status & UART_MSR_DCTS) | |
226 | uart_handle_cts_change(&up->port, status & UART_MSR_CTS); | |
227 | ||
228 | wake_up_interruptible(&up->port.info->delta_msr_wait); | |
229 | } | |
230 | ||
231 | /* | |
232 | * This handles the interrupt from one port. | |
233 | */ | |
7d12e780 | 234 | static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id) |
1da177e4 | 235 | { |
c7bec5ab | 236 | struct uart_pxa_port *up = dev_id; |
1da177e4 LT |
237 | unsigned int iir, lsr; |
238 | ||
239 | iir = serial_in(up, UART_IIR); | |
240 | if (iir & UART_IIR_NO_INT) | |
241 | return IRQ_NONE; | |
242 | lsr = serial_in(up, UART_LSR); | |
243 | if (lsr & UART_LSR_DR) | |
7d12e780 | 244 | receive_chars(up, &lsr); |
1da177e4 LT |
245 | check_modem_status(up); |
246 | if (lsr & UART_LSR_THRE) | |
247 | transmit_chars(up); | |
248 | return IRQ_HANDLED; | |
249 | } | |
250 | ||
251 | static unsigned int serial_pxa_tx_empty(struct uart_port *port) | |
252 | { | |
253 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
254 | unsigned long flags; | |
255 | unsigned int ret; | |
256 | ||
257 | spin_lock_irqsave(&up->port.lock, flags); | |
258 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; | |
259 | spin_unlock_irqrestore(&up->port.lock, flags); | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | static unsigned int serial_pxa_get_mctrl(struct uart_port *port) | |
265 | { | |
266 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
1da177e4 LT |
267 | unsigned char status; |
268 | unsigned int ret; | |
269 | ||
1da177e4 | 270 | status = serial_in(up, UART_MSR); |
1da177e4 LT |
271 | |
272 | ret = 0; | |
273 | if (status & UART_MSR_DCD) | |
274 | ret |= TIOCM_CAR; | |
275 | if (status & UART_MSR_RI) | |
276 | ret |= TIOCM_RNG; | |
277 | if (status & UART_MSR_DSR) | |
278 | ret |= TIOCM_DSR; | |
279 | if (status & UART_MSR_CTS) | |
280 | ret |= TIOCM_CTS; | |
281 | return ret; | |
282 | } | |
283 | ||
284 | static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
285 | { | |
286 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
287 | unsigned char mcr = 0; | |
288 | ||
289 | if (mctrl & TIOCM_RTS) | |
290 | mcr |= UART_MCR_RTS; | |
291 | if (mctrl & TIOCM_DTR) | |
292 | mcr |= UART_MCR_DTR; | |
293 | if (mctrl & TIOCM_OUT1) | |
294 | mcr |= UART_MCR_OUT1; | |
295 | if (mctrl & TIOCM_OUT2) | |
296 | mcr |= UART_MCR_OUT2; | |
297 | if (mctrl & TIOCM_LOOP) | |
298 | mcr |= UART_MCR_LOOP; | |
299 | ||
300 | mcr |= up->mcr; | |
301 | ||
302 | serial_out(up, UART_MCR, mcr); | |
303 | } | |
304 | ||
305 | static void serial_pxa_break_ctl(struct uart_port *port, int break_state) | |
306 | { | |
307 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
308 | unsigned long flags; | |
309 | ||
310 | spin_lock_irqsave(&up->port.lock, flags); | |
311 | if (break_state == -1) | |
312 | up->lcr |= UART_LCR_SBC; | |
313 | else | |
314 | up->lcr &= ~UART_LCR_SBC; | |
315 | serial_out(up, UART_LCR, up->lcr); | |
316 | spin_unlock_irqrestore(&up->port.lock, flags); | |
317 | } | |
318 | ||
319 | #if 0 | |
320 | static void serial_pxa_dma_init(struct pxa_uart *up) | |
321 | { | |
322 | up->rxdma = | |
323 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up); | |
324 | if (up->rxdma < 0) | |
325 | goto out; | |
326 | up->txdma = | |
327 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up); | |
328 | if (up->txdma < 0) | |
329 | goto err_txdma; | |
330 | up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL); | |
331 | if (!up->dmadesc) | |
332 | goto err_alloc; | |
333 | ||
334 | /* ... */ | |
335 | err_alloc: | |
336 | pxa_free_dma(up->txdma); | |
337 | err_rxdma: | |
338 | pxa_free_dma(up->rxdma); | |
339 | out: | |
340 | return; | |
341 | } | |
342 | #endif | |
343 | ||
344 | static int serial_pxa_startup(struct uart_port *port) | |
345 | { | |
346 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
347 | unsigned long flags; | |
348 | int retval; | |
349 | ||
d9e29649 MR |
350 | if (port->line == 3) /* HWUART */ |
351 | up->mcr |= UART_MCR_AFE; | |
352 | else | |
f02aa3f9 | 353 | up->mcr = 0; |
1da177e4 | 354 | |
b049bd9d RK |
355 | up->port.uartclk = clk_get_rate(up->clk); |
356 | ||
1da177e4 LT |
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 | |
80f7228b | 393 | * are set via set_termios(), which will be occurring imminently |
1da177e4 LT |
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 | |
606d099c AC |
439 | serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios, |
440 | struct ktermios *old) | |
1da177e4 LT |
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; | |
b049bd9d | 552 | |
1da177e4 | 553 | if (!state) |
b049bd9d RK |
554 | clk_enable(up->clk); |
555 | else | |
556 | clk_disable(up->clk); | |
1da177e4 LT |
557 | } |
558 | ||
559 | static void serial_pxa_release_port(struct uart_port *port) | |
560 | { | |
561 | } | |
562 | ||
563 | static int serial_pxa_request_port(struct uart_port *port) | |
564 | { | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static void serial_pxa_config_port(struct uart_port *port, int flags) | |
569 | { | |
570 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
571 | up->port.type = PORT_PXA; | |
572 | } | |
573 | ||
574 | static int | |
575 | serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser) | |
576 | { | |
577 | /* we don't want the core code to modify any port params */ | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | static const char * | |
582 | serial_pxa_type(struct uart_port *port) | |
583 | { | |
584 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
585 | return up->name; | |
586 | } | |
587 | ||
e259a3ae | 588 | static struct uart_pxa_port *serial_pxa_ports[4]; |
2d93486c | 589 | static struct uart_driver serial_pxa_reg; |
1da177e4 | 590 | |
fa7f1518 PZ |
591 | #ifdef CONFIG_SERIAL_PXA_CONSOLE |
592 | ||
1da177e4 LT |
593 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
594 | ||
595 | /* | |
596 | * Wait for transmitter & holding register to empty | |
597 | */ | |
598 | static inline void wait_for_xmitr(struct uart_pxa_port *up) | |
599 | { | |
600 | unsigned int status, tmout = 10000; | |
601 | ||
602 | /* Wait up to 10ms for the character(s) to be sent. */ | |
603 | do { | |
604 | status = serial_in(up, UART_LSR); | |
605 | ||
606 | if (status & UART_LSR_BI) | |
607 | up->lsr_break_flag = UART_LSR_BI; | |
608 | ||
609 | if (--tmout == 0) | |
610 | break; | |
611 | udelay(1); | |
612 | } while ((status & BOTH_EMPTY) != BOTH_EMPTY); | |
613 | ||
614 | /* Wait up to 1s for flow control if necessary */ | |
615 | if (up->port.flags & UPF_CONS_FLOW) { | |
616 | tmout = 1000000; | |
617 | while (--tmout && | |
618 | ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) | |
619 | udelay(1); | |
620 | } | |
621 | } | |
622 | ||
d358788f RK |
623 | static void serial_pxa_console_putchar(struct uart_port *port, int ch) |
624 | { | |
625 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; | |
626 | ||
627 | wait_for_xmitr(up); | |
628 | serial_out(up, UART_TX, ch); | |
629 | } | |
630 | ||
1da177e4 LT |
631 | /* |
632 | * Print a string to the serial port trying not to disturb | |
633 | * any possible real use of the port... | |
634 | * | |
635 | * The console_lock must be held when we get here. | |
636 | */ | |
637 | static void | |
638 | serial_pxa_console_write(struct console *co, const char *s, unsigned int count) | |
639 | { | |
e259a3ae | 640 | struct uart_pxa_port *up = serial_pxa_ports[co->index]; |
1da177e4 | 641 | unsigned int ier; |
1da177e4 | 642 | |
b049bd9d RK |
643 | clk_enable(up->clk); |
644 | ||
1da177e4 | 645 | /* |
f02aa3f9 | 646 | * First save the IER then disable the interrupts |
1da177e4 LT |
647 | */ |
648 | ier = serial_in(up, UART_IER); | |
649 | serial_out(up, UART_IER, UART_IER_UUE); | |
650 | ||
d358788f | 651 | uart_console_write(&up->port, s, count, serial_pxa_console_putchar); |
1da177e4 LT |
652 | |
653 | /* | |
654 | * Finally, wait for transmitter to become empty | |
655 | * and restore the IER | |
656 | */ | |
657 | wait_for_xmitr(up); | |
658 | serial_out(up, UART_IER, ier); | |
b049bd9d RK |
659 | |
660 | clk_disable(up->clk); | |
1da177e4 LT |
661 | } |
662 | ||
663 | static int __init | |
664 | serial_pxa_console_setup(struct console *co, char *options) | |
665 | { | |
666 | struct uart_pxa_port *up; | |
667 | int baud = 9600; | |
668 | int bits = 8; | |
669 | int parity = 'n'; | |
670 | int flow = 'n'; | |
671 | ||
672 | if (co->index == -1 || co->index >= serial_pxa_reg.nr) | |
673 | co->index = 0; | |
e259a3ae RK |
674 | up = serial_pxa_ports[co->index]; |
675 | if (!up) | |
676 | return -ENODEV; | |
1da177e4 LT |
677 | |
678 | if (options) | |
679 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
680 | ||
681 | return uart_set_options(&up->port, co, baud, parity, bits, flow); | |
682 | } | |
683 | ||
684 | static struct console serial_pxa_console = { | |
685 | .name = "ttyS", | |
686 | .write = serial_pxa_console_write, | |
687 | .device = uart_console_device, | |
688 | .setup = serial_pxa_console_setup, | |
689 | .flags = CON_PRINTBUFFER, | |
690 | .index = -1, | |
691 | .data = &serial_pxa_reg, | |
692 | }; | |
693 | ||
1da177e4 LT |
694 | #define PXA_CONSOLE &serial_pxa_console |
695 | #else | |
696 | #define PXA_CONSOLE NULL | |
697 | #endif | |
698 | ||
699 | struct uart_ops serial_pxa_pops = { | |
700 | .tx_empty = serial_pxa_tx_empty, | |
701 | .set_mctrl = serial_pxa_set_mctrl, | |
702 | .get_mctrl = serial_pxa_get_mctrl, | |
703 | .stop_tx = serial_pxa_stop_tx, | |
704 | .start_tx = serial_pxa_start_tx, | |
705 | .stop_rx = serial_pxa_stop_rx, | |
706 | .enable_ms = serial_pxa_enable_ms, | |
707 | .break_ctl = serial_pxa_break_ctl, | |
708 | .startup = serial_pxa_startup, | |
709 | .shutdown = serial_pxa_shutdown, | |
710 | .set_termios = serial_pxa_set_termios, | |
711 | .pm = serial_pxa_pm, | |
712 | .type = serial_pxa_type, | |
713 | .release_port = serial_pxa_release_port, | |
714 | .request_port = serial_pxa_request_port, | |
715 | .config_port = serial_pxa_config_port, | |
716 | .verify_port = serial_pxa_verify_port, | |
717 | }; | |
718 | ||
1da177e4 LT |
719 | static struct uart_driver serial_pxa_reg = { |
720 | .owner = THIS_MODULE, | |
721 | .driver_name = "PXA serial", | |
1da177e4 LT |
722 | .dev_name = "ttyS", |
723 | .major = TTY_MAJOR, | |
724 | .minor = 64, | |
e259a3ae | 725 | .nr = 4, |
1da177e4 LT |
726 | .cons = PXA_CONSOLE, |
727 | }; | |
728 | ||
3ae5eaec | 729 | static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 730 | { |
3ae5eaec | 731 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 732 | |
9480e307 | 733 | if (sport) |
1da177e4 LT |
734 | uart_suspend_port(&serial_pxa_reg, &sport->port); |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
3ae5eaec | 739 | static int serial_pxa_resume(struct platform_device *dev) |
1da177e4 | 740 | { |
3ae5eaec | 741 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 742 | |
9480e307 | 743 | if (sport) |
1da177e4 LT |
744 | uart_resume_port(&serial_pxa_reg, &sport->port); |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
3ae5eaec | 749 | static int serial_pxa_probe(struct platform_device *dev) |
1da177e4 | 750 | { |
e259a3ae RK |
751 | struct uart_pxa_port *sport; |
752 | struct resource *mmres, *irqres; | |
753 | int ret; | |
754 | ||
755 | mmres = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
756 | irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0); | |
757 | if (!mmres || !irqres) | |
758 | return -ENODEV; | |
759 | ||
760 | sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL); | |
761 | if (!sport) | |
762 | return -ENOMEM; | |
763 | ||
b049bd9d RK |
764 | sport->clk = clk_get(&dev->dev, "UARTCLK"); |
765 | if (IS_ERR(sport->clk)) { | |
766 | ret = PTR_ERR(sport->clk); | |
767 | goto err_free; | |
768 | } | |
769 | ||
e259a3ae RK |
770 | sport->port.type = PORT_PXA; |
771 | sport->port.iotype = UPIO_MEM; | |
772 | sport->port.mapbase = mmres->start; | |
773 | sport->port.irq = irqres->start; | |
774 | sport->port.fifosize = 64; | |
775 | sport->port.ops = &serial_pxa_pops; | |
776 | sport->port.line = dev->id; | |
777 | sport->port.dev = &dev->dev; | |
778 | sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; | |
b049bd9d | 779 | sport->port.uartclk = clk_get_rate(sport->clk); |
e259a3ae RK |
780 | |
781 | /* | |
782 | * Is it worth keeping this? | |
783 | */ | |
784 | if (mmres->start == __PREG(FFUART)) | |
785 | sport->name = "FFUART"; | |
786 | else if (mmres->start == __PREG(BTUART)) | |
787 | sport->name = "BTUART"; | |
788 | else if (mmres->start == __PREG(STUART)) | |
789 | sport->name = "STUART"; | |
790 | else if (mmres->start == __PREG(HWUART)) | |
791 | sport->name = "HWUART"; | |
792 | else | |
793 | sport->name = "???"; | |
794 | ||
795 | sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1); | |
796 | if (!sport->port.membase) { | |
797 | ret = -ENOMEM; | |
b049bd9d | 798 | goto err_clk; |
e259a3ae RK |
799 | } |
800 | ||
801 | serial_pxa_ports[dev->id] = sport; | |
802 | ||
803 | uart_add_one_port(&serial_pxa_reg, &sport->port); | |
804 | platform_set_drvdata(dev, sport); | |
805 | ||
1da177e4 | 806 | return 0; |
e259a3ae | 807 | |
b049bd9d RK |
808 | err_clk: |
809 | clk_put(sport->clk); | |
e259a3ae RK |
810 | err_free: |
811 | kfree(sport); | |
812 | return ret; | |
1da177e4 LT |
813 | } |
814 | ||
3ae5eaec | 815 | static int serial_pxa_remove(struct platform_device *dev) |
1da177e4 | 816 | { |
3ae5eaec | 817 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
1da177e4 | 818 | |
3ae5eaec | 819 | platform_set_drvdata(dev, NULL); |
1da177e4 | 820 | |
e259a3ae | 821 | uart_remove_one_port(&serial_pxa_reg, &sport->port); |
b049bd9d | 822 | clk_put(sport->clk); |
e259a3ae | 823 | kfree(sport); |
1da177e4 LT |
824 | |
825 | return 0; | |
826 | } | |
827 | ||
3ae5eaec | 828 | static struct platform_driver serial_pxa_driver = { |
1da177e4 LT |
829 | .probe = serial_pxa_probe, |
830 | .remove = serial_pxa_remove, | |
831 | ||
832 | .suspend = serial_pxa_suspend, | |
833 | .resume = serial_pxa_resume, | |
3ae5eaec RK |
834 | .driver = { |
835 | .name = "pxa2xx-uart", | |
e169c139 | 836 | .owner = THIS_MODULE, |
3ae5eaec | 837 | }, |
1da177e4 LT |
838 | }; |
839 | ||
840 | int __init serial_pxa_init(void) | |
841 | { | |
842 | int ret; | |
843 | ||
844 | ret = uart_register_driver(&serial_pxa_reg); | |
845 | if (ret != 0) | |
846 | return ret; | |
847 | ||
3ae5eaec | 848 | ret = platform_driver_register(&serial_pxa_driver); |
1da177e4 LT |
849 | if (ret != 0) |
850 | uart_unregister_driver(&serial_pxa_reg); | |
851 | ||
852 | return ret; | |
853 | } | |
854 | ||
855 | void __exit serial_pxa_exit(void) | |
856 | { | |
3ae5eaec | 857 | platform_driver_unregister(&serial_pxa_driver); |
1da177e4 LT |
858 | uart_unregister_driver(&serial_pxa_reg); |
859 | } | |
860 | ||
861 | module_init(serial_pxa_init); | |
862 | module_exit(serial_pxa_exit); | |
863 | ||
864 | MODULE_LICENSE("GPL"); | |
e169c139 | 865 | MODULE_ALIAS("platform:pxa2xx-uart"); |