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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/amba.c | |
3 | * | |
4 | * Driver for AMBA serial ports | |
5 | * | |
6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
7 | * | |
8 | * Copyright 1999 ARM Limited | |
9 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
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 | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | * $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $ | |
26 | * | |
27 | * This is a generic driver for ARM AMBA-type serial ports. They | |
28 | * have a lot of 16550-like features, but are not register compatible. | |
29 | * Note that although they do have CTS, DCD and DSR inputs, they do | |
30 | * not have an RI input, nor do they have DTR or RTS outputs. If | |
31 | * required, these have to be supplied via some other means (eg, GPIO) | |
32 | * and hooked into this driver. | |
33 | */ | |
34 | #include <linux/config.h> | |
35 | ||
36 | #if defined(CONFIG_SERIAL_AMBA_PL011_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
37 | #define SUPPORT_SYSRQ | |
38 | #endif | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/ioport.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/console.h> | |
44 | #include <linux/sysrq.h> | |
45 | #include <linux/device.h> | |
46 | #include <linux/tty.h> | |
47 | #include <linux/tty_flip.h> | |
48 | #include <linux/serial_core.h> | |
49 | #include <linux/serial.h> | |
a62c80e5 RK |
50 | #include <linux/amba/bus.h> |
51 | #include <linux/amba/serial.h> | |
f8ce2547 | 52 | #include <linux/clk.h> |
1da177e4 LT |
53 | |
54 | #include <asm/io.h> | |
c6b8fdad | 55 | #include <asm/sizes.h> |
1da177e4 LT |
56 | |
57 | #define UART_NR 14 | |
58 | ||
59 | #define SERIAL_AMBA_MAJOR 204 | |
60 | #define SERIAL_AMBA_MINOR 64 | |
61 | #define SERIAL_AMBA_NR UART_NR | |
62 | ||
63 | #define AMBA_ISR_PASS_LIMIT 256 | |
64 | ||
b63d4f0f RK |
65 | #define UART_DR_ERROR (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE) |
66 | #define UART_DUMMY_DR_RX (1 << 16) | |
1da177e4 LT |
67 | |
68 | /* | |
69 | * We wrap our port structure around the generic uart_port. | |
70 | */ | |
71 | struct uart_amba_port { | |
72 | struct uart_port port; | |
73 | struct clk *clk; | |
74 | unsigned int im; /* interrupt mask */ | |
75 | unsigned int old_status; | |
76 | }; | |
77 | ||
b129a8cc | 78 | static void pl011_stop_tx(struct uart_port *port) |
1da177e4 LT |
79 | { |
80 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
81 | ||
82 | uap->im &= ~UART011_TXIM; | |
83 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
84 | } | |
85 | ||
b129a8cc | 86 | static void pl011_start_tx(struct uart_port *port) |
1da177e4 LT |
87 | { |
88 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
89 | ||
90 | uap->im |= UART011_TXIM; | |
91 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
92 | } | |
93 | ||
94 | static void pl011_stop_rx(struct uart_port *port) | |
95 | { | |
96 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
97 | ||
98 | uap->im &= ~(UART011_RXIM|UART011_RTIM|UART011_FEIM| | |
99 | UART011_PEIM|UART011_BEIM|UART011_OEIM); | |
100 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
101 | } | |
102 | ||
103 | static void pl011_enable_ms(struct uart_port *port) | |
104 | { | |
105 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
106 | ||
107 | uap->im |= UART011_RIMIM|UART011_CTSMIM|UART011_DCDMIM|UART011_DSRMIM; | |
108 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
109 | } | |
110 | ||
111 | static void | |
112 | #ifdef SUPPORT_SYSRQ | |
113 | pl011_rx_chars(struct uart_amba_port *uap, struct pt_regs *regs) | |
114 | #else | |
115 | pl011_rx_chars(struct uart_amba_port *uap) | |
116 | #endif | |
117 | { | |
118 | struct tty_struct *tty = uap->port.info->tty; | |
b63d4f0f | 119 | unsigned int status, ch, flag, max_count = 256; |
1da177e4 LT |
120 | |
121 | status = readw(uap->port.membase + UART01x_FR); | |
122 | while ((status & UART01x_FR_RXFE) == 0 && max_count--) { | |
b63d4f0f | 123 | ch = readw(uap->port.membase + UART01x_DR) | UART_DUMMY_DR_RX; |
1da177e4 LT |
124 | flag = TTY_NORMAL; |
125 | uap->port.icount.rx++; | |
126 | ||
127 | /* | |
128 | * Note that the error handling code is | |
129 | * out of the main execution path | |
130 | */ | |
b63d4f0f RK |
131 | if (unlikely(ch & UART_DR_ERROR)) { |
132 | if (ch & UART011_DR_BE) { | |
133 | ch &= ~(UART011_DR_FE | UART011_DR_PE); | |
1da177e4 LT |
134 | uap->port.icount.brk++; |
135 | if (uart_handle_break(&uap->port)) | |
136 | goto ignore_char; | |
b63d4f0f | 137 | } else if (ch & UART011_DR_PE) |
1da177e4 | 138 | uap->port.icount.parity++; |
b63d4f0f | 139 | else if (ch & UART011_DR_FE) |
1da177e4 | 140 | uap->port.icount.frame++; |
b63d4f0f | 141 | if (ch & UART011_DR_OE) |
1da177e4 LT |
142 | uap->port.icount.overrun++; |
143 | ||
b63d4f0f | 144 | ch &= uap->port.read_status_mask; |
1da177e4 | 145 | |
b63d4f0f | 146 | if (ch & UART011_DR_BE) |
1da177e4 | 147 | flag = TTY_BREAK; |
b63d4f0f | 148 | else if (ch & UART011_DR_PE) |
1da177e4 | 149 | flag = TTY_PARITY; |
b63d4f0f | 150 | else if (ch & UART011_DR_FE) |
1da177e4 LT |
151 | flag = TTY_FRAME; |
152 | } | |
153 | ||
a710ce08 | 154 | if (uart_handle_sysrq_char(&uap->port, ch & 255, regs)) |
1da177e4 LT |
155 | goto ignore_char; |
156 | ||
b63d4f0f | 157 | uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag); |
05ab3014 | 158 | |
1da177e4 LT |
159 | ignore_char: |
160 | status = readw(uap->port.membase + UART01x_FR); | |
161 | } | |
162 | tty_flip_buffer_push(tty); | |
163 | return; | |
164 | } | |
165 | ||
166 | static void pl011_tx_chars(struct uart_amba_port *uap) | |
167 | { | |
168 | struct circ_buf *xmit = &uap->port.info->xmit; | |
169 | int count; | |
170 | ||
171 | if (uap->port.x_char) { | |
172 | writew(uap->port.x_char, uap->port.membase + UART01x_DR); | |
173 | uap->port.icount.tx++; | |
174 | uap->port.x_char = 0; | |
175 | return; | |
176 | } | |
177 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { | |
b129a8cc | 178 | pl011_stop_tx(&uap->port); |
1da177e4 LT |
179 | return; |
180 | } | |
181 | ||
182 | count = uap->port.fifosize >> 1; | |
183 | do { | |
184 | writew(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR); | |
185 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
186 | uap->port.icount.tx++; | |
187 | if (uart_circ_empty(xmit)) | |
188 | break; | |
189 | } while (--count > 0); | |
190 | ||
191 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
192 | uart_write_wakeup(&uap->port); | |
193 | ||
194 | if (uart_circ_empty(xmit)) | |
b129a8cc | 195 | pl011_stop_tx(&uap->port); |
1da177e4 LT |
196 | } |
197 | ||
198 | static void pl011_modem_status(struct uart_amba_port *uap) | |
199 | { | |
200 | unsigned int status, delta; | |
201 | ||
202 | status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; | |
203 | ||
204 | delta = status ^ uap->old_status; | |
205 | uap->old_status = status; | |
206 | ||
207 | if (!delta) | |
208 | return; | |
209 | ||
210 | if (delta & UART01x_FR_DCD) | |
211 | uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD); | |
212 | ||
213 | if (delta & UART01x_FR_DSR) | |
214 | uap->port.icount.dsr++; | |
215 | ||
216 | if (delta & UART01x_FR_CTS) | |
217 | uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS); | |
218 | ||
219 | wake_up_interruptible(&uap->port.info->delta_msr_wait); | |
220 | } | |
221 | ||
222 | static irqreturn_t pl011_int(int irq, void *dev_id, struct pt_regs *regs) | |
223 | { | |
224 | struct uart_amba_port *uap = dev_id; | |
225 | unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; | |
226 | int handled = 0; | |
227 | ||
228 | spin_lock(&uap->port.lock); | |
229 | ||
230 | status = readw(uap->port.membase + UART011_MIS); | |
231 | if (status) { | |
232 | do { | |
233 | writew(status & ~(UART011_TXIS|UART011_RTIS| | |
234 | UART011_RXIS), | |
235 | uap->port.membase + UART011_ICR); | |
236 | ||
237 | if (status & (UART011_RTIS|UART011_RXIS)) | |
238 | #ifdef SUPPORT_SYSRQ | |
239 | pl011_rx_chars(uap, regs); | |
240 | #else | |
241 | pl011_rx_chars(uap); | |
242 | #endif | |
243 | if (status & (UART011_DSRMIS|UART011_DCDMIS| | |
244 | UART011_CTSMIS|UART011_RIMIS)) | |
245 | pl011_modem_status(uap); | |
246 | if (status & UART011_TXIS) | |
247 | pl011_tx_chars(uap); | |
248 | ||
249 | if (pass_counter-- == 0) | |
250 | break; | |
251 | ||
252 | status = readw(uap->port.membase + UART011_MIS); | |
253 | } while (status != 0); | |
254 | handled = 1; | |
255 | } | |
256 | ||
257 | spin_unlock(&uap->port.lock); | |
258 | ||
259 | return IRQ_RETVAL(handled); | |
260 | } | |
261 | ||
262 | static unsigned int pl01x_tx_empty(struct uart_port *port) | |
263 | { | |
264 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
265 | unsigned int status = readw(uap->port.membase + UART01x_FR); | |
266 | return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT; | |
267 | } | |
268 | ||
269 | static unsigned int pl01x_get_mctrl(struct uart_port *port) | |
270 | { | |
271 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
272 | unsigned int result = 0; | |
273 | unsigned int status = readw(uap->port.membase + UART01x_FR); | |
274 | ||
275 | #define BIT(uartbit, tiocmbit) \ | |
276 | if (status & uartbit) \ | |
277 | result |= tiocmbit | |
278 | ||
279 | BIT(UART01x_FR_DCD, TIOCM_CAR); | |
280 | BIT(UART01x_FR_DSR, TIOCM_DSR); | |
281 | BIT(UART01x_FR_CTS, TIOCM_CTS); | |
282 | BIT(UART011_FR_RI, TIOCM_RNG); | |
283 | #undef BIT | |
284 | return result; | |
285 | } | |
286 | ||
287 | static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
288 | { | |
289 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
290 | unsigned int cr; | |
291 | ||
292 | cr = readw(uap->port.membase + UART011_CR); | |
293 | ||
294 | #define BIT(tiocmbit, uartbit) \ | |
295 | if (mctrl & tiocmbit) \ | |
296 | cr |= uartbit; \ | |
297 | else \ | |
298 | cr &= ~uartbit | |
299 | ||
300 | BIT(TIOCM_RTS, UART011_CR_RTS); | |
301 | BIT(TIOCM_DTR, UART011_CR_DTR); | |
302 | BIT(TIOCM_OUT1, UART011_CR_OUT1); | |
303 | BIT(TIOCM_OUT2, UART011_CR_OUT2); | |
304 | BIT(TIOCM_LOOP, UART011_CR_LBE); | |
305 | #undef BIT | |
306 | ||
307 | writew(cr, uap->port.membase + UART011_CR); | |
308 | } | |
309 | ||
310 | static void pl011_break_ctl(struct uart_port *port, int break_state) | |
311 | { | |
312 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
313 | unsigned long flags; | |
314 | unsigned int lcr_h; | |
315 | ||
316 | spin_lock_irqsave(&uap->port.lock, flags); | |
317 | lcr_h = readw(uap->port.membase + UART011_LCRH); | |
318 | if (break_state == -1) | |
319 | lcr_h |= UART01x_LCRH_BRK; | |
320 | else | |
321 | lcr_h &= ~UART01x_LCRH_BRK; | |
322 | writew(lcr_h, uap->port.membase + UART011_LCRH); | |
323 | spin_unlock_irqrestore(&uap->port.lock, flags); | |
324 | } | |
325 | ||
326 | static int pl011_startup(struct uart_port *port) | |
327 | { | |
328 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
329 | unsigned int cr; | |
330 | int retval; | |
331 | ||
332 | /* | |
333 | * Try to enable the clock producer. | |
334 | */ | |
335 | retval = clk_enable(uap->clk); | |
336 | if (retval) | |
337 | goto out; | |
338 | ||
339 | uap->port.uartclk = clk_get_rate(uap->clk); | |
340 | ||
341 | /* | |
342 | * Allocate the IRQ | |
343 | */ | |
344 | retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap); | |
345 | if (retval) | |
346 | goto clk_dis; | |
347 | ||
348 | writew(UART011_IFLS_RX4_8|UART011_IFLS_TX4_8, | |
349 | uap->port.membase + UART011_IFLS); | |
350 | ||
351 | /* | |
352 | * Provoke TX FIFO interrupt into asserting. | |
353 | */ | |
354 | cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE; | |
355 | writew(cr, uap->port.membase + UART011_CR); | |
356 | writew(0, uap->port.membase + UART011_FBRD); | |
357 | writew(1, uap->port.membase + UART011_IBRD); | |
358 | writew(0, uap->port.membase + UART011_LCRH); | |
359 | writew(0, uap->port.membase + UART01x_DR); | |
360 | while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY) | |
361 | barrier(); | |
362 | ||
363 | cr = UART01x_CR_UARTEN | UART011_CR_RXE | UART011_CR_TXE; | |
364 | writew(cr, uap->port.membase + UART011_CR); | |
365 | ||
366 | /* | |
367 | * initialise the old status of the modem signals | |
368 | */ | |
369 | uap->old_status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; | |
370 | ||
371 | /* | |
372 | * Finally, enable interrupts | |
373 | */ | |
374 | spin_lock_irq(&uap->port.lock); | |
375 | uap->im = UART011_RXIM | UART011_RTIM; | |
376 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
377 | spin_unlock_irq(&uap->port.lock); | |
378 | ||
379 | return 0; | |
380 | ||
381 | clk_dis: | |
382 | clk_disable(uap->clk); | |
383 | out: | |
384 | return retval; | |
385 | } | |
386 | ||
387 | static void pl011_shutdown(struct uart_port *port) | |
388 | { | |
389 | struct uart_amba_port *uap = (struct uart_amba_port *)port; | |
390 | unsigned long val; | |
391 | ||
392 | /* | |
393 | * disable all interrupts | |
394 | */ | |
395 | spin_lock_irq(&uap->port.lock); | |
396 | uap->im = 0; | |
397 | writew(uap->im, uap->port.membase + UART011_IMSC); | |
398 | writew(0xffff, uap->port.membase + UART011_ICR); | |
399 | spin_unlock_irq(&uap->port.lock); | |
400 | ||
401 | /* | |
402 | * Free the interrupt | |
403 | */ | |
404 | free_irq(uap->port.irq, uap); | |
405 | ||
406 | /* | |
407 | * disable the port | |
408 | */ | |
409 | writew(UART01x_CR_UARTEN | UART011_CR_TXE, uap->port.membase + UART011_CR); | |
410 | ||
411 | /* | |
412 | * disable break condition and fifos | |
413 | */ | |
414 | val = readw(uap->port.membase + UART011_LCRH); | |
415 | val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN); | |
416 | writew(val, uap->port.membase + UART011_LCRH); | |
417 | ||
418 | /* | |
419 | * Shut down the clock producer | |
420 | */ | |
421 | clk_disable(uap->clk); | |
422 | } | |
423 | ||
424 | static void | |
425 | pl011_set_termios(struct uart_port *port, struct termios *termios, | |
426 | struct termios *old) | |
427 | { | |
428 | unsigned int lcr_h, old_cr; | |
429 | unsigned long flags; | |
430 | unsigned int baud, quot; | |
431 | ||
432 | /* | |
433 | * Ask the core to calculate the divisor for us. | |
434 | */ | |
435 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
436 | quot = port->uartclk * 4 / baud; | |
437 | ||
438 | switch (termios->c_cflag & CSIZE) { | |
439 | case CS5: | |
440 | lcr_h = UART01x_LCRH_WLEN_5; | |
441 | break; | |
442 | case CS6: | |
443 | lcr_h = UART01x_LCRH_WLEN_6; | |
444 | break; | |
445 | case CS7: | |
446 | lcr_h = UART01x_LCRH_WLEN_7; | |
447 | break; | |
448 | default: // CS8 | |
449 | lcr_h = UART01x_LCRH_WLEN_8; | |
450 | break; | |
451 | } | |
452 | if (termios->c_cflag & CSTOPB) | |
453 | lcr_h |= UART01x_LCRH_STP2; | |
454 | if (termios->c_cflag & PARENB) { | |
455 | lcr_h |= UART01x_LCRH_PEN; | |
456 | if (!(termios->c_cflag & PARODD)) | |
457 | lcr_h |= UART01x_LCRH_EPS; | |
458 | } | |
459 | if (port->fifosize > 1) | |
460 | lcr_h |= UART01x_LCRH_FEN; | |
461 | ||
462 | spin_lock_irqsave(&port->lock, flags); | |
463 | ||
464 | /* | |
465 | * Update the per-port timeout. | |
466 | */ | |
467 | uart_update_timeout(port, termios->c_cflag, baud); | |
468 | ||
b63d4f0f | 469 | port->read_status_mask = UART011_DR_OE | 255; |
1da177e4 | 470 | if (termios->c_iflag & INPCK) |
b63d4f0f | 471 | port->read_status_mask |= UART011_DR_FE | UART011_DR_PE; |
1da177e4 | 472 | if (termios->c_iflag & (BRKINT | PARMRK)) |
b63d4f0f | 473 | port->read_status_mask |= UART011_DR_BE; |
1da177e4 LT |
474 | |
475 | /* | |
476 | * Characters to ignore | |
477 | */ | |
478 | port->ignore_status_mask = 0; | |
479 | if (termios->c_iflag & IGNPAR) | |
b63d4f0f | 480 | port->ignore_status_mask |= UART011_DR_FE | UART011_DR_PE; |
1da177e4 | 481 | if (termios->c_iflag & IGNBRK) { |
b63d4f0f | 482 | port->ignore_status_mask |= UART011_DR_BE; |
1da177e4 LT |
483 | /* |
484 | * If we're ignoring parity and break indicators, | |
485 | * ignore overruns too (for real raw support). | |
486 | */ | |
487 | if (termios->c_iflag & IGNPAR) | |
b63d4f0f | 488 | port->ignore_status_mask |= UART011_DR_OE; |
1da177e4 LT |
489 | } |
490 | ||
491 | /* | |
492 | * Ignore all characters if CREAD is not set. | |
493 | */ | |
494 | if ((termios->c_cflag & CREAD) == 0) | |
b63d4f0f | 495 | port->ignore_status_mask |= UART_DUMMY_DR_RX; |
1da177e4 LT |
496 | |
497 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
498 | pl011_enable_ms(port); | |
499 | ||
500 | /* first, disable everything */ | |
501 | old_cr = readw(port->membase + UART011_CR); | |
502 | writew(0, port->membase + UART011_CR); | |
503 | ||
504 | /* Set baud rate */ | |
505 | writew(quot & 0x3f, port->membase + UART011_FBRD); | |
506 | writew(quot >> 6, port->membase + UART011_IBRD); | |
507 | ||
508 | /* | |
509 | * ----------v----------v----------v----------v----- | |
510 | * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L | |
511 | * ----------^----------^----------^----------^----- | |
512 | */ | |
513 | writew(lcr_h, port->membase + UART011_LCRH); | |
514 | writew(old_cr, port->membase + UART011_CR); | |
515 | ||
516 | spin_unlock_irqrestore(&port->lock, flags); | |
517 | } | |
518 | ||
519 | static const char *pl011_type(struct uart_port *port) | |
520 | { | |
521 | return port->type == PORT_AMBA ? "AMBA/PL011" : NULL; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Release the memory region(s) being used by 'port' | |
526 | */ | |
527 | static void pl010_release_port(struct uart_port *port) | |
528 | { | |
529 | release_mem_region(port->mapbase, SZ_4K); | |
530 | } | |
531 | ||
532 | /* | |
533 | * Request the memory region(s) being used by 'port' | |
534 | */ | |
535 | static int pl010_request_port(struct uart_port *port) | |
536 | { | |
537 | return request_mem_region(port->mapbase, SZ_4K, "uart-pl011") | |
538 | != NULL ? 0 : -EBUSY; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Configure/autoconfigure the port. | |
543 | */ | |
544 | static void pl010_config_port(struct uart_port *port, int flags) | |
545 | { | |
546 | if (flags & UART_CONFIG_TYPE) { | |
547 | port->type = PORT_AMBA; | |
548 | pl010_request_port(port); | |
549 | } | |
550 | } | |
551 | ||
552 | /* | |
553 | * verify the new serial_struct (for TIOCSSERIAL). | |
554 | */ | |
555 | static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser) | |
556 | { | |
557 | int ret = 0; | |
558 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA) | |
559 | ret = -EINVAL; | |
560 | if (ser->irq < 0 || ser->irq >= NR_IRQS) | |
561 | ret = -EINVAL; | |
562 | if (ser->baud_base < 9600) | |
563 | ret = -EINVAL; | |
564 | return ret; | |
565 | } | |
566 | ||
567 | static struct uart_ops amba_pl011_pops = { | |
568 | .tx_empty = pl01x_tx_empty, | |
569 | .set_mctrl = pl011_set_mctrl, | |
570 | .get_mctrl = pl01x_get_mctrl, | |
571 | .stop_tx = pl011_stop_tx, | |
572 | .start_tx = pl011_start_tx, | |
573 | .stop_rx = pl011_stop_rx, | |
574 | .enable_ms = pl011_enable_ms, | |
575 | .break_ctl = pl011_break_ctl, | |
576 | .startup = pl011_startup, | |
577 | .shutdown = pl011_shutdown, | |
578 | .set_termios = pl011_set_termios, | |
579 | .type = pl011_type, | |
580 | .release_port = pl010_release_port, | |
581 | .request_port = pl010_request_port, | |
582 | .config_port = pl010_config_port, | |
583 | .verify_port = pl010_verify_port, | |
584 | }; | |
585 | ||
586 | static struct uart_amba_port *amba_ports[UART_NR]; | |
587 | ||
588 | #ifdef CONFIG_SERIAL_AMBA_PL011_CONSOLE | |
589 | ||
d358788f | 590 | static void pl011_console_putchar(struct uart_port *port, int ch) |
1da177e4 | 591 | { |
d358788f | 592 | struct uart_amba_port *uap = (struct uart_amba_port *)port; |
1da177e4 | 593 | |
d358788f RK |
594 | while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF) |
595 | barrier(); | |
1da177e4 LT |
596 | writew(ch, uap->port.membase + UART01x_DR); |
597 | } | |
598 | ||
599 | static void | |
600 | pl011_console_write(struct console *co, const char *s, unsigned int count) | |
601 | { | |
602 | struct uart_amba_port *uap = amba_ports[co->index]; | |
603 | unsigned int status, old_cr, new_cr; | |
1da177e4 LT |
604 | |
605 | clk_enable(uap->clk); | |
606 | ||
607 | /* | |
608 | * First save the CR then disable the interrupts | |
609 | */ | |
610 | old_cr = readw(uap->port.membase + UART011_CR); | |
611 | new_cr = old_cr & ~UART011_CR_CTSEN; | |
612 | new_cr |= UART01x_CR_UARTEN | UART011_CR_TXE; | |
613 | writew(new_cr, uap->port.membase + UART011_CR); | |
614 | ||
d358788f | 615 | uart_console_write(&uap->port, s, count, pl011_console_putchar); |
1da177e4 LT |
616 | |
617 | /* | |
618 | * Finally, wait for transmitter to become empty | |
619 | * and restore the TCR | |
620 | */ | |
621 | do { | |
622 | status = readw(uap->port.membase + UART01x_FR); | |
623 | } while (status & UART01x_FR_BUSY); | |
624 | writew(old_cr, uap->port.membase + UART011_CR); | |
625 | ||
626 | clk_disable(uap->clk); | |
627 | } | |
628 | ||
629 | static void __init | |
630 | pl011_console_get_options(struct uart_amba_port *uap, int *baud, | |
631 | int *parity, int *bits) | |
632 | { | |
633 | if (readw(uap->port.membase + UART011_CR) & UART01x_CR_UARTEN) { | |
634 | unsigned int lcr_h, ibrd, fbrd; | |
635 | ||
636 | lcr_h = readw(uap->port.membase + UART011_LCRH); | |
637 | ||
638 | *parity = 'n'; | |
639 | if (lcr_h & UART01x_LCRH_PEN) { | |
640 | if (lcr_h & UART01x_LCRH_EPS) | |
641 | *parity = 'e'; | |
642 | else | |
643 | *parity = 'o'; | |
644 | } | |
645 | ||
646 | if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7) | |
647 | *bits = 7; | |
648 | else | |
649 | *bits = 8; | |
650 | ||
651 | ibrd = readw(uap->port.membase + UART011_IBRD); | |
652 | fbrd = readw(uap->port.membase + UART011_FBRD); | |
653 | ||
654 | *baud = uap->port.uartclk * 4 / (64 * ibrd + fbrd); | |
655 | } | |
656 | } | |
657 | ||
658 | static int __init pl011_console_setup(struct console *co, char *options) | |
659 | { | |
660 | struct uart_amba_port *uap; | |
661 | int baud = 38400; | |
662 | int bits = 8; | |
663 | int parity = 'n'; | |
664 | int flow = 'n'; | |
665 | ||
666 | /* | |
667 | * Check whether an invalid uart number has been specified, and | |
668 | * if so, search for the first available port that does have | |
669 | * console support. | |
670 | */ | |
671 | if (co->index >= UART_NR) | |
672 | co->index = 0; | |
673 | uap = amba_ports[co->index]; | |
674 | ||
675 | uap->port.uartclk = clk_get_rate(uap->clk); | |
676 | ||
677 | if (options) | |
678 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
679 | else | |
680 | pl011_console_get_options(uap, &baud, &parity, &bits); | |
681 | ||
682 | return uart_set_options(&uap->port, co, baud, parity, bits, flow); | |
683 | } | |
684 | ||
2d93486c | 685 | static struct uart_driver amba_reg; |
1da177e4 LT |
686 | static struct console amba_console = { |
687 | .name = "ttyAMA", | |
688 | .write = pl011_console_write, | |
689 | .device = uart_console_device, | |
690 | .setup = pl011_console_setup, | |
691 | .flags = CON_PRINTBUFFER, | |
692 | .index = -1, | |
693 | .data = &amba_reg, | |
694 | }; | |
695 | ||
696 | #define AMBA_CONSOLE (&amba_console) | |
697 | #else | |
698 | #define AMBA_CONSOLE NULL | |
699 | #endif | |
700 | ||
701 | static struct uart_driver amba_reg = { | |
702 | .owner = THIS_MODULE, | |
703 | .driver_name = "ttyAMA", | |
704 | .dev_name = "ttyAMA", | |
705 | .major = SERIAL_AMBA_MAJOR, | |
706 | .minor = SERIAL_AMBA_MINOR, | |
707 | .nr = UART_NR, | |
708 | .cons = AMBA_CONSOLE, | |
709 | }; | |
710 | ||
711 | static int pl011_probe(struct amba_device *dev, void *id) | |
712 | { | |
713 | struct uart_amba_port *uap; | |
714 | void __iomem *base; | |
715 | int i, ret; | |
716 | ||
717 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) | |
718 | if (amba_ports[i] == NULL) | |
719 | break; | |
720 | ||
721 | if (i == ARRAY_SIZE(amba_ports)) { | |
722 | ret = -EBUSY; | |
723 | goto out; | |
724 | } | |
725 | ||
726 | uap = kmalloc(sizeof(struct uart_amba_port), GFP_KERNEL); | |
727 | if (uap == NULL) { | |
728 | ret = -ENOMEM; | |
729 | goto out; | |
730 | } | |
731 | ||
732 | base = ioremap(dev->res.start, PAGE_SIZE); | |
733 | if (!base) { | |
734 | ret = -ENOMEM; | |
735 | goto free; | |
736 | } | |
737 | ||
738 | memset(uap, 0, sizeof(struct uart_amba_port)); | |
739 | uap->clk = clk_get(&dev->dev, "UARTCLK"); | |
740 | if (IS_ERR(uap->clk)) { | |
741 | ret = PTR_ERR(uap->clk); | |
742 | goto unmap; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | uap->port.dev = &dev->dev; |
746 | uap->port.mapbase = dev->res.start; | |
747 | uap->port.membase = base; | |
748 | uap->port.iotype = UPIO_MEM; | |
749 | uap->port.irq = dev->irq[0]; | |
750 | uap->port.fifosize = 16; | |
751 | uap->port.ops = &amba_pl011_pops; | |
752 | uap->port.flags = UPF_BOOT_AUTOCONF; | |
753 | uap->port.line = i; | |
754 | ||
755 | amba_ports[i] = uap; | |
756 | ||
757 | amba_set_drvdata(dev, uap); | |
758 | ret = uart_add_one_port(&amba_reg, &uap->port); | |
759 | if (ret) { | |
760 | amba_set_drvdata(dev, NULL); | |
761 | amba_ports[i] = NULL; | |
1da177e4 LT |
762 | clk_put(uap->clk); |
763 | unmap: | |
764 | iounmap(base); | |
765 | free: | |
766 | kfree(uap); | |
767 | } | |
768 | out: | |
769 | return ret; | |
770 | } | |
771 | ||
772 | static int pl011_remove(struct amba_device *dev) | |
773 | { | |
774 | struct uart_amba_port *uap = amba_get_drvdata(dev); | |
775 | int i; | |
776 | ||
777 | amba_set_drvdata(dev, NULL); | |
778 | ||
779 | uart_remove_one_port(&amba_reg, &uap->port); | |
780 | ||
781 | for (i = 0; i < ARRAY_SIZE(amba_ports); i++) | |
782 | if (amba_ports[i] == uap) | |
783 | amba_ports[i] = NULL; | |
784 | ||
785 | iounmap(uap->port.membase); | |
1da177e4 LT |
786 | clk_put(uap->clk); |
787 | kfree(uap); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | static struct amba_id pl011_ids[] __initdata = { | |
792 | { | |
793 | .id = 0x00041011, | |
794 | .mask = 0x000fffff, | |
795 | }, | |
796 | { 0, 0 }, | |
797 | }; | |
798 | ||
799 | static struct amba_driver pl011_driver = { | |
800 | .drv = { | |
801 | .name = "uart-pl011", | |
802 | }, | |
803 | .id_table = pl011_ids, | |
804 | .probe = pl011_probe, | |
805 | .remove = pl011_remove, | |
806 | }; | |
807 | ||
808 | static int __init pl011_init(void) | |
809 | { | |
810 | int ret; | |
811 | printk(KERN_INFO "Serial: AMBA PL011 UART driver\n"); | |
812 | ||
813 | ret = uart_register_driver(&amba_reg); | |
814 | if (ret == 0) { | |
815 | ret = amba_driver_register(&pl011_driver); | |
816 | if (ret) | |
817 | uart_unregister_driver(&amba_reg); | |
818 | } | |
819 | return ret; | |
820 | } | |
821 | ||
822 | static void __exit pl011_exit(void) | |
823 | { | |
824 | amba_driver_unregister(&pl011_driver); | |
825 | uart_unregister_driver(&amba_reg); | |
826 | } | |
827 | ||
828 | module_init(pl011_init); | |
829 | module_exit(pl011_exit); | |
830 | ||
831 | MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd"); | |
832 | MODULE_DESCRIPTION("ARM AMBA serial port driver"); | |
833 | MODULE_LICENSE("GPL"); |