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de8211b9 VW |
1 | /* |
2 | * UART driver for PNX8XXX SoCs | |
3 | * | |
4 | * Author: Per Hallsmark per.hallsmark@mvista.com | |
5 | * Ported to 2.6 kernel by EmbeddedAlley | |
6 | * Reworked by Vitaly Wool <vitalywool@gmail.com> | |
7 | * | |
8 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
9 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
10 | * | |
11 | * This file is licensed under the terms of the GNU General Public License | |
12 | * version 2. This program is licensed "as is" without any warranty of | |
13 | * any kind, whether express or implied. | |
14 | * | |
15 | */ | |
16 | ||
17 | #if defined(CONFIG_SERIAL_PNX8XXX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
18 | #define SUPPORT_SYSRQ | |
19 | #endif | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/ioport.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/console.h> | |
25 | #include <linux/sysrq.h> | |
26 | #include <linux/device.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/tty.h> | |
29 | #include <linux/tty_flip.h> | |
30 | #include <linux/serial_core.h> | |
31 | #include <linux/serial.h> | |
32 | #include <linux/serial_pnx8xxx.h> | |
33 | ||
34 | #include <asm/io.h> | |
35 | #include <asm/irq.h> | |
36 | ||
37 | /* We'll be using StrongARM sa1100 serial port major/minor */ | |
38 | #define SERIAL_PNX8XXX_MAJOR 204 | |
39 | #define MINOR_START 5 | |
40 | ||
41 | #define NR_PORTS 2 | |
42 | ||
43 | #define PNX8XXX_ISR_PASS_LIMIT 256 | |
44 | ||
45 | /* | |
46 | * Convert from ignore_status_mask or read_status_mask to FIFO | |
47 | * and interrupt status bits | |
48 | */ | |
49 | #define SM_TO_FIFO(x) ((x) >> 10) | |
50 | #define SM_TO_ISTAT(x) ((x) & 0x000001ff) | |
51 | #define FIFO_TO_SM(x) ((x) << 10) | |
52 | #define ISTAT_TO_SM(x) ((x) & 0x000001ff) | |
53 | ||
54 | /* | |
55 | * This is the size of our serial port register set. | |
56 | */ | |
57 | #define UART_PORT_SIZE 0x1000 | |
58 | ||
59 | /* | |
60 | * This determines how often we check the modem status signals | |
61 | * for any change. They generally aren't connected to an IRQ | |
62 | * so we have to poll them. We also check immediately before | |
63 | * filling the TX fifo incase CTS has been dropped. | |
64 | */ | |
65 | #define MCTRL_TIMEOUT (250*HZ/1000) | |
66 | ||
67 | extern struct pnx8xxx_port pnx8xxx_ports[]; | |
68 | ||
69 | static inline int serial_in(struct pnx8xxx_port *sport, int offset) | |
70 | { | |
71 | return (__raw_readl(sport->port.membase + offset)); | |
72 | } | |
73 | ||
74 | static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value) | |
75 | { | |
76 | __raw_writel(value, sport->port.membase + offset); | |
77 | } | |
78 | ||
79 | /* | |
80 | * Handle any change of modem status signal since we were last called. | |
81 | */ | |
82 | static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport) | |
83 | { | |
84 | unsigned int status, changed; | |
85 | ||
86 | status = sport->port.ops->get_mctrl(&sport->port); | |
87 | changed = status ^ sport->old_status; | |
88 | ||
89 | if (changed == 0) | |
90 | return; | |
91 | ||
92 | sport->old_status = status; | |
93 | ||
94 | if (changed & TIOCM_RI) | |
95 | sport->port.icount.rng++; | |
96 | if (changed & TIOCM_DSR) | |
97 | sport->port.icount.dsr++; | |
98 | if (changed & TIOCM_CAR) | |
99 | uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); | |
100 | if (changed & TIOCM_CTS) | |
101 | uart_handle_cts_change(&sport->port, status & TIOCM_CTS); | |
102 | ||
bdc04e31 | 103 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
de8211b9 VW |
104 | } |
105 | ||
106 | /* | |
107 | * This is our per-port timeout handler, for checking the | |
108 | * modem status signals. | |
109 | */ | |
110 | static void pnx8xxx_timeout(unsigned long data) | |
111 | { | |
112 | struct pnx8xxx_port *sport = (struct pnx8xxx_port *)data; | |
113 | unsigned long flags; | |
114 | ||
ebd2c8f6 | 115 | if (sport->port.state) { |
de8211b9 VW |
116 | spin_lock_irqsave(&sport->port.lock, flags); |
117 | pnx8xxx_mctrl_check(sport); | |
118 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
119 | ||
120 | mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); | |
121 | } | |
122 | } | |
123 | ||
124 | /* | |
125 | * interrupts disabled on entry | |
126 | */ | |
127 | static void pnx8xxx_stop_tx(struct uart_port *port) | |
128 | { | |
afc5438b FF |
129 | struct pnx8xxx_port *sport = |
130 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
131 | u32 ien; |
132 | ||
133 | /* Disable TX intr */ | |
134 | ien = serial_in(sport, PNX8XXX_IEN); | |
135 | serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX); | |
136 | ||
137 | /* Clear all pending TX intr */ | |
138 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX); | |
139 | } | |
140 | ||
141 | /* | |
142 | * interrupts may not be disabled on entry | |
143 | */ | |
144 | static void pnx8xxx_start_tx(struct uart_port *port) | |
145 | { | |
afc5438b FF |
146 | struct pnx8xxx_port *sport = |
147 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
148 | u32 ien; |
149 | ||
150 | /* Clear all pending TX intr */ | |
151 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX); | |
152 | ||
153 | /* Enable TX intr */ | |
154 | ien = serial_in(sport, PNX8XXX_IEN); | |
155 | serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX); | |
156 | } | |
157 | ||
158 | /* | |
159 | * Interrupts enabled | |
160 | */ | |
161 | static void pnx8xxx_stop_rx(struct uart_port *port) | |
162 | { | |
afc5438b FF |
163 | struct pnx8xxx_port *sport = |
164 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
165 | u32 ien; |
166 | ||
167 | /* Disable RX intr */ | |
168 | ien = serial_in(sport, PNX8XXX_IEN); | |
169 | serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX); | |
170 | ||
171 | /* Clear all pending RX intr */ | |
172 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Set the modem control timer to fire immediately. | |
177 | */ | |
178 | static void pnx8xxx_enable_ms(struct uart_port *port) | |
179 | { | |
afc5438b FF |
180 | struct pnx8xxx_port *sport = |
181 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
182 | |
183 | mod_timer(&sport->timer, jiffies); | |
184 | } | |
185 | ||
186 | static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport) | |
187 | { | |
de8211b9 VW |
188 | unsigned int status, ch, flg; |
189 | ||
190 | status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) | | |
191 | ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT)); | |
192 | while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) { | |
cd1e40f0 | 193 | ch = serial_in(sport, PNX8XXX_FIFO) & 0xff; |
de8211b9 VW |
194 | |
195 | sport->port.icount.rx++; | |
196 | ||
197 | flg = TTY_NORMAL; | |
198 | ||
199 | /* | |
200 | * note that the error handling code is | |
201 | * out of the main execution path | |
202 | */ | |
203 | if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE | | |
cd1e40f0 MJ |
204 | PNX8XXX_UART_FIFO_RXPAR | |
205 | PNX8XXX_UART_FIFO_RXBRK) | | |
de8211b9 | 206 | ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) { |
cd1e40f0 MJ |
207 | if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) { |
208 | status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) | | |
209 | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR)); | |
210 | sport->port.icount.brk++; | |
211 | if (uart_handle_break(&sport->port)) | |
212 | goto ignore_char; | |
213 | } else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR)) | |
de8211b9 VW |
214 | sport->port.icount.parity++; |
215 | else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE)) | |
216 | sport->port.icount.frame++; | |
217 | if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN)) | |
218 | sport->port.icount.overrun++; | |
219 | ||
220 | status &= sport->port.read_status_mask; | |
221 | ||
222 | if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR)) | |
223 | flg = TTY_PARITY; | |
224 | else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE)) | |
225 | flg = TTY_FRAME; | |
226 | ||
227 | #ifdef SUPPORT_SYSRQ | |
228 | sport->port.sysrq = 0; | |
229 | #endif | |
230 | } | |
231 | ||
232 | if (uart_handle_sysrq_char(&sport->port, ch)) | |
233 | goto ignore_char; | |
234 | ||
235 | uart_insert_char(&sport->port, status, | |
236 | ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg); | |
237 | ||
238 | ignore_char: | |
239 | serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) | | |
240 | PNX8XXX_UART_LCR_RX_NEXT); | |
241 | status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) | | |
242 | ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT)); | |
243 | } | |
1df7e249 VK |
244 | |
245 | spin_unlock(&sport->port.lock); | |
2e124b4a | 246 | tty_flip_buffer_push(&sport->port.state->port); |
1df7e249 | 247 | spin_lock(&sport->port.lock); |
de8211b9 VW |
248 | } |
249 | ||
250 | static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport) | |
251 | { | |
ebd2c8f6 | 252 | struct circ_buf *xmit = &sport->port.state->xmit; |
de8211b9 VW |
253 | |
254 | if (sport->port.x_char) { | |
255 | serial_out(sport, PNX8XXX_FIFO, sport->port.x_char); | |
256 | sport->port.icount.tx++; | |
257 | sport->port.x_char = 0; | |
258 | return; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Check the modem control lines before | |
263 | * transmitting anything. | |
264 | */ | |
265 | pnx8xxx_mctrl_check(sport); | |
266 | ||
267 | if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { | |
268 | pnx8xxx_stop_tx(&sport->port); | |
269 | return; | |
270 | } | |
271 | ||
272 | /* | |
273 | * TX while bytes available | |
274 | */ | |
275 | while (((serial_in(sport, PNX8XXX_FIFO) & | |
276 | PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) { | |
277 | serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]); | |
278 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
279 | sport->port.icount.tx++; | |
280 | if (uart_circ_empty(xmit)) | |
281 | break; | |
282 | } | |
283 | ||
284 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
285 | uart_write_wakeup(&sport->port); | |
286 | ||
287 | if (uart_circ_empty(xmit)) | |
288 | pnx8xxx_stop_tx(&sport->port); | |
289 | } | |
290 | ||
291 | static irqreturn_t pnx8xxx_int(int irq, void *dev_id) | |
292 | { | |
293 | struct pnx8xxx_port *sport = dev_id; | |
294 | unsigned int status; | |
295 | ||
296 | spin_lock(&sport->port.lock); | |
297 | /* Get the interrupts */ | |
298 | status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN); | |
299 | ||
cd1e40f0 MJ |
300 | /* Byte or break signal received */ |
301 | if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK)) | |
de8211b9 VW |
302 | pnx8xxx_rx_chars(sport); |
303 | ||
304 | /* TX holding register empty - transmit a byte */ | |
305 | if (status & PNX8XXX_UART_INT_TX) | |
306 | pnx8xxx_tx_chars(sport); | |
307 | ||
308 | /* Clear the ISTAT register */ | |
309 | serial_out(sport, PNX8XXX_ICLR, status); | |
310 | ||
311 | spin_unlock(&sport->port.lock); | |
312 | return IRQ_HANDLED; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Return TIOCSER_TEMT when transmitter is not busy. | |
317 | */ | |
318 | static unsigned int pnx8xxx_tx_empty(struct uart_port *port) | |
319 | { | |
afc5438b FF |
320 | struct pnx8xxx_port *sport = |
321 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
322 | |
323 | return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT; | |
324 | } | |
325 | ||
326 | static unsigned int pnx8xxx_get_mctrl(struct uart_port *port) | |
327 | { | |
afc5438b FF |
328 | struct pnx8xxx_port *sport = |
329 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
330 | unsigned int mctrl = TIOCM_DSR; |
331 | unsigned int msr; | |
332 | ||
333 | /* REVISIT */ | |
334 | ||
335 | msr = serial_in(sport, PNX8XXX_MCR); | |
336 | ||
337 | mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0; | |
338 | mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0; | |
339 | ||
340 | return mctrl; | |
341 | } | |
342 | ||
343 | static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
344 | { | |
345 | #if 0 /* FIXME */ | |
346 | struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port; | |
347 | unsigned int msr; | |
348 | #endif | |
349 | } | |
350 | ||
351 | /* | |
352 | * Interrupts always disabled. | |
353 | */ | |
354 | static void pnx8xxx_break_ctl(struct uart_port *port, int break_state) | |
355 | { | |
afc5438b FF |
356 | struct pnx8xxx_port *sport = |
357 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
358 | unsigned long flags; |
359 | unsigned int lcr; | |
360 | ||
361 | spin_lock_irqsave(&sport->port.lock, flags); | |
362 | lcr = serial_in(sport, PNX8XXX_LCR); | |
363 | if (break_state == -1) | |
364 | lcr |= PNX8XXX_UART_LCR_TXBREAK; | |
365 | else | |
366 | lcr &= ~PNX8XXX_UART_LCR_TXBREAK; | |
367 | serial_out(sport, PNX8XXX_LCR, lcr); | |
368 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
369 | } | |
370 | ||
371 | static int pnx8xxx_startup(struct uart_port *port) | |
372 | { | |
afc5438b FF |
373 | struct pnx8xxx_port *sport = |
374 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
375 | int retval; |
376 | ||
377 | /* | |
378 | * Allocate the IRQ | |
379 | */ | |
380 | retval = request_irq(sport->port.irq, pnx8xxx_int, 0, | |
381 | "pnx8xxx-uart", sport); | |
382 | if (retval) | |
383 | return retval; | |
384 | ||
385 | /* | |
386 | * Finally, clear and enable interrupts | |
387 | */ | |
388 | ||
389 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX | | |
390 | PNX8XXX_UART_INT_ALLTX); | |
391 | ||
392 | serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) | | |
393 | PNX8XXX_UART_INT_ALLRX | | |
394 | PNX8XXX_UART_INT_ALLTX); | |
395 | ||
396 | /* | |
397 | * Enable modem status interrupts | |
398 | */ | |
399 | spin_lock_irq(&sport->port.lock); | |
400 | pnx8xxx_enable_ms(&sport->port); | |
401 | spin_unlock_irq(&sport->port.lock); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static void pnx8xxx_shutdown(struct uart_port *port) | |
407 | { | |
afc5438b FF |
408 | struct pnx8xxx_port *sport = |
409 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
410 | int lcr; |
411 | ||
412 | /* | |
413 | * Stop our timer. | |
414 | */ | |
415 | del_timer_sync(&sport->timer); | |
416 | ||
417 | /* | |
418 | * Disable all interrupts | |
419 | */ | |
420 | serial_out(sport, PNX8XXX_IEN, 0); | |
421 | ||
422 | /* | |
423 | * Reset the Tx and Rx FIFOS, disable the break condition | |
424 | */ | |
425 | lcr = serial_in(sport, PNX8XXX_LCR); | |
426 | lcr &= ~PNX8XXX_UART_LCR_TXBREAK; | |
427 | lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST; | |
428 | serial_out(sport, PNX8XXX_LCR, lcr); | |
429 | ||
430 | /* | |
431 | * Clear all interrupts | |
432 | */ | |
433 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX | | |
434 | PNX8XXX_UART_INT_ALLTX); | |
435 | ||
436 | /* | |
437 | * Free the interrupt | |
438 | */ | |
439 | free_irq(sport->port.irq, sport); | |
440 | } | |
441 | ||
442 | static void | |
443 | pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios, | |
444 | struct ktermios *old) | |
445 | { | |
afc5438b FF |
446 | struct pnx8xxx_port *sport = |
447 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
448 | unsigned long flags; |
449 | unsigned int lcr_fcr, old_ien, baud, quot; | |
450 | unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; | |
451 | ||
452 | /* | |
453 | * We only support CS7 and CS8. | |
454 | */ | |
455 | while ((termios->c_cflag & CSIZE) != CS7 && | |
456 | (termios->c_cflag & CSIZE) != CS8) { | |
457 | termios->c_cflag &= ~CSIZE; | |
458 | termios->c_cflag |= old_csize; | |
459 | old_csize = CS8; | |
460 | } | |
461 | ||
462 | if ((termios->c_cflag & CSIZE) == CS8) | |
463 | lcr_fcr = PNX8XXX_UART_LCR_8BIT; | |
464 | else | |
465 | lcr_fcr = 0; | |
466 | ||
467 | if (termios->c_cflag & CSTOPB) | |
468 | lcr_fcr |= PNX8XXX_UART_LCR_2STOPB; | |
469 | if (termios->c_cflag & PARENB) { | |
470 | lcr_fcr |= PNX8XXX_UART_LCR_PAREN; | |
471 | if (!(termios->c_cflag & PARODD)) | |
472 | lcr_fcr |= PNX8XXX_UART_LCR_PAREVN; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Ask the core to calculate the divisor for us. | |
477 | */ | |
478 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
479 | quot = uart_get_divisor(port, baud); | |
480 | ||
481 | spin_lock_irqsave(&sport->port.lock, flags); | |
482 | ||
483 | sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) | | |
484 | ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) | | |
485 | ISTAT_TO_SM(PNX8XXX_UART_INT_RX); | |
486 | if (termios->c_iflag & INPCK) | |
487 | sport->port.read_status_mask |= | |
488 | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) | | |
489 | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR); | |
ef8b9ddc | 490 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
de8211b9 VW |
491 | sport->port.read_status_mask |= |
492 | ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK); | |
493 | ||
494 | /* | |
495 | * Characters to ignore | |
496 | */ | |
497 | sport->port.ignore_status_mask = 0; | |
498 | if (termios->c_iflag & IGNPAR) | |
499 | sport->port.ignore_status_mask |= | |
500 | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) | | |
501 | FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR); | |
502 | if (termios->c_iflag & IGNBRK) { | |
503 | sport->port.ignore_status_mask |= | |
504 | ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK); | |
505 | /* | |
506 | * If we're ignoring parity and break indicators, | |
507 | * ignore overruns too (for real raw support). | |
508 | */ | |
509 | if (termios->c_iflag & IGNPAR) | |
510 | sport->port.ignore_status_mask |= | |
511 | ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN); | |
512 | } | |
513 | ||
514 | /* | |
515 | * ignore all characters if CREAD is not set | |
516 | */ | |
517 | if ((termios->c_cflag & CREAD) == 0) | |
518 | sport->port.ignore_status_mask |= | |
519 | ISTAT_TO_SM(PNX8XXX_UART_INT_RX); | |
520 | ||
521 | del_timer_sync(&sport->timer); | |
522 | ||
523 | /* | |
524 | * Update the per-port timeout. | |
525 | */ | |
526 | uart_update_timeout(port, termios->c_cflag, baud); | |
527 | ||
528 | /* | |
529 | * disable interrupts and drain transmitter | |
530 | */ | |
531 | old_ien = serial_in(sport, PNX8XXX_IEN); | |
532 | serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX | | |
533 | PNX8XXX_UART_INT_ALLRX)); | |
534 | ||
535 | while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA) | |
536 | barrier(); | |
537 | ||
538 | /* then, disable everything */ | |
539 | serial_out(sport, PNX8XXX_IEN, 0); | |
540 | ||
541 | /* Reset the Rx and Tx FIFOs too */ | |
542 | lcr_fcr |= PNX8XXX_UART_LCR_TX_RST; | |
543 | lcr_fcr |= PNX8XXX_UART_LCR_RX_RST; | |
544 | ||
545 | /* set the parity, stop bits and data size */ | |
546 | serial_out(sport, PNX8XXX_LCR, lcr_fcr); | |
547 | ||
548 | /* set the baud rate */ | |
549 | quot -= 1; | |
550 | serial_out(sport, PNX8XXX_BAUD, quot); | |
551 | ||
552 | serial_out(sport, PNX8XXX_ICLR, -1); | |
553 | ||
554 | serial_out(sport, PNX8XXX_IEN, old_ien); | |
555 | ||
556 | if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) | |
557 | pnx8xxx_enable_ms(&sport->port); | |
558 | ||
559 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
560 | } | |
561 | ||
562 | static const char *pnx8xxx_type(struct uart_port *port) | |
563 | { | |
afc5438b FF |
564 | struct pnx8xxx_port *sport = |
565 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
566 | |
567 | return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Release the memory region(s) being used by 'port'. | |
572 | */ | |
573 | static void pnx8xxx_release_port(struct uart_port *port) | |
574 | { | |
afc5438b FF |
575 | struct pnx8xxx_port *sport = |
576 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
577 | |
578 | release_mem_region(sport->port.mapbase, UART_PORT_SIZE); | |
579 | } | |
580 | ||
581 | /* | |
582 | * Request the memory region(s) being used by 'port'. | |
583 | */ | |
584 | static int pnx8xxx_request_port(struct uart_port *port) | |
585 | { | |
afc5438b FF |
586 | struct pnx8xxx_port *sport = |
587 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
588 | return request_mem_region(sport->port.mapbase, UART_PORT_SIZE, |
589 | "pnx8xxx-uart") != NULL ? 0 : -EBUSY; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Configure/autoconfigure the port. | |
594 | */ | |
595 | static void pnx8xxx_config_port(struct uart_port *port, int flags) | |
596 | { | |
afc5438b FF |
597 | struct pnx8xxx_port *sport = |
598 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
599 | |
600 | if (flags & UART_CONFIG_TYPE && | |
601 | pnx8xxx_request_port(&sport->port) == 0) | |
602 | sport->port.type = PORT_PNX8XXX; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Verify the new serial_struct (for TIOCSSERIAL). | |
607 | * The only change we allow are to the flags and type, and | |
608 | * even then only between PORT_PNX8XXX and PORT_UNKNOWN | |
609 | */ | |
610 | static int | |
611 | pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser) | |
612 | { | |
afc5438b FF |
613 | struct pnx8xxx_port *sport = |
614 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
615 | int ret = 0; |
616 | ||
617 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX) | |
618 | ret = -EINVAL; | |
619 | if (sport->port.irq != ser->irq) | |
620 | ret = -EINVAL; | |
621 | if (ser->io_type != SERIAL_IO_MEM) | |
622 | ret = -EINVAL; | |
623 | if (sport->port.uartclk / 16 != ser->baud_base) | |
624 | ret = -EINVAL; | |
625 | if ((void *)sport->port.mapbase != ser->iomem_base) | |
626 | ret = -EINVAL; | |
627 | if (sport->port.iobase != ser->port) | |
628 | ret = -EINVAL; | |
629 | if (ser->hub6 != 0) | |
630 | ret = -EINVAL; | |
631 | return ret; | |
632 | } | |
633 | ||
634 | static struct uart_ops pnx8xxx_pops = { | |
635 | .tx_empty = pnx8xxx_tx_empty, | |
636 | .set_mctrl = pnx8xxx_set_mctrl, | |
637 | .get_mctrl = pnx8xxx_get_mctrl, | |
638 | .stop_tx = pnx8xxx_stop_tx, | |
639 | .start_tx = pnx8xxx_start_tx, | |
640 | .stop_rx = pnx8xxx_stop_rx, | |
641 | .enable_ms = pnx8xxx_enable_ms, | |
642 | .break_ctl = pnx8xxx_break_ctl, | |
643 | .startup = pnx8xxx_startup, | |
644 | .shutdown = pnx8xxx_shutdown, | |
645 | .set_termios = pnx8xxx_set_termios, | |
646 | .type = pnx8xxx_type, | |
647 | .release_port = pnx8xxx_release_port, | |
648 | .request_port = pnx8xxx_request_port, | |
649 | .config_port = pnx8xxx_config_port, | |
650 | .verify_port = pnx8xxx_verify_port, | |
651 | }; | |
652 | ||
653 | ||
654 | /* | |
655 | * Setup the PNX8XXX serial ports. | |
656 | * | |
657 | * Note also that we support "console=ttySx" where "x" is either 0 or 1. | |
658 | */ | |
659 | static void __init pnx8xxx_init_ports(void) | |
660 | { | |
661 | static int first = 1; | |
662 | int i; | |
663 | ||
664 | if (!first) | |
665 | return; | |
666 | first = 0; | |
667 | ||
668 | for (i = 0; i < NR_PORTS; i++) { | |
669 | init_timer(&pnx8xxx_ports[i].timer); | |
670 | pnx8xxx_ports[i].timer.function = pnx8xxx_timeout; | |
671 | pnx8xxx_ports[i].timer.data = (unsigned long)&pnx8xxx_ports[i]; | |
672 | pnx8xxx_ports[i].port.ops = &pnx8xxx_pops; | |
673 | } | |
674 | } | |
675 | ||
676 | #ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE | |
677 | ||
678 | static void pnx8xxx_console_putchar(struct uart_port *port, int ch) | |
679 | { | |
afc5438b FF |
680 | struct pnx8xxx_port *sport = |
681 | container_of(port, struct pnx8xxx_port, port); | |
de8211b9 VW |
682 | int status; |
683 | ||
684 | do { | |
685 | /* Wait for UART_TX register to empty */ | |
686 | status = serial_in(sport, PNX8XXX_FIFO); | |
687 | } while (status & PNX8XXX_UART_FIFO_TXFIFO); | |
688 | serial_out(sport, PNX8XXX_FIFO, ch); | |
689 | } | |
690 | ||
691 | /* | |
692 | * Interrupts are disabled on entering | |
693 | */static void | |
694 | pnx8xxx_console_write(struct console *co, const char *s, unsigned int count) | |
695 | { | |
696 | struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index]; | |
697 | unsigned int old_ien, status; | |
698 | ||
699 | /* | |
700 | * First, save IEN and then disable interrupts | |
701 | */ | |
702 | old_ien = serial_in(sport, PNX8XXX_IEN); | |
703 | serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX | | |
704 | PNX8XXX_UART_INT_ALLRX)); | |
705 | ||
706 | uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar); | |
707 | ||
708 | /* | |
709 | * Finally, wait for transmitter to become empty | |
710 | * and restore IEN | |
711 | */ | |
712 | do { | |
713 | /* Wait for UART_TX register to empty */ | |
714 | status = serial_in(sport, PNX8XXX_FIFO); | |
715 | } while (status & PNX8XXX_UART_FIFO_TXFIFO); | |
716 | ||
717 | /* Clear TX and EMPTY interrupt */ | |
718 | serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX | | |
719 | PNX8XXX_UART_INT_EMPTY); | |
720 | ||
721 | serial_out(sport, PNX8XXX_IEN, old_ien); | |
722 | } | |
723 | ||
724 | static int __init | |
725 | pnx8xxx_console_setup(struct console *co, char *options) | |
726 | { | |
727 | struct pnx8xxx_port *sport; | |
728 | int baud = 38400; | |
729 | int bits = 8; | |
730 | int parity = 'n'; | |
731 | int flow = 'n'; | |
732 | ||
733 | /* | |
734 | * Check whether an invalid uart number has been specified, and | |
735 | * if so, search for the first available port that does have | |
736 | * console support. | |
737 | */ | |
738 | if (co->index == -1 || co->index >= NR_PORTS) | |
739 | co->index = 0; | |
740 | sport = &pnx8xxx_ports[co->index]; | |
741 | ||
742 | if (options) | |
743 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
744 | ||
745 | return uart_set_options(&sport->port, co, baud, parity, bits, flow); | |
746 | } | |
747 | ||
748 | static struct uart_driver pnx8xxx_reg; | |
749 | static struct console pnx8xxx_console = { | |
750 | .name = "ttyS", | |
751 | .write = pnx8xxx_console_write, | |
752 | .device = uart_console_device, | |
753 | .setup = pnx8xxx_console_setup, | |
754 | .flags = CON_PRINTBUFFER, | |
755 | .index = -1, | |
756 | .data = &pnx8xxx_reg, | |
757 | }; | |
758 | ||
759 | static int __init pnx8xxx_rs_console_init(void) | |
760 | { | |
761 | pnx8xxx_init_ports(); | |
762 | register_console(&pnx8xxx_console); | |
763 | return 0; | |
764 | } | |
765 | console_initcall(pnx8xxx_rs_console_init); | |
766 | ||
767 | #define PNX8XXX_CONSOLE &pnx8xxx_console | |
768 | #else | |
769 | #define PNX8XXX_CONSOLE NULL | |
770 | #endif | |
771 | ||
772 | static struct uart_driver pnx8xxx_reg = { | |
773 | .owner = THIS_MODULE, | |
774 | .driver_name = "ttyS", | |
775 | .dev_name = "ttyS", | |
776 | .major = SERIAL_PNX8XXX_MAJOR, | |
777 | .minor = MINOR_START, | |
778 | .nr = NR_PORTS, | |
779 | .cons = PNX8XXX_CONSOLE, | |
780 | }; | |
781 | ||
782 | static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state) | |
783 | { | |
784 | struct pnx8xxx_port *sport = platform_get_drvdata(pdev); | |
785 | ||
786 | return uart_suspend_port(&pnx8xxx_reg, &sport->port); | |
787 | } | |
788 | ||
789 | static int pnx8xxx_serial_resume(struct platform_device *pdev) | |
790 | { | |
791 | struct pnx8xxx_port *sport = platform_get_drvdata(pdev); | |
792 | ||
793 | return uart_resume_port(&pnx8xxx_reg, &sport->port); | |
794 | } | |
795 | ||
796 | static int pnx8xxx_serial_probe(struct platform_device *pdev) | |
797 | { | |
798 | struct resource *res = pdev->resource; | |
799 | int i; | |
800 | ||
801 | for (i = 0; i < pdev->num_resources; i++, res++) { | |
802 | if (!(res->flags & IORESOURCE_MEM)) | |
803 | continue; | |
804 | ||
805 | for (i = 0; i < NR_PORTS; i++) { | |
806 | if (pnx8xxx_ports[i].port.mapbase != res->start) | |
807 | continue; | |
808 | ||
809 | pnx8xxx_ports[i].port.dev = &pdev->dev; | |
810 | uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port); | |
811 | platform_set_drvdata(pdev, &pnx8xxx_ports[i]); | |
812 | break; | |
813 | } | |
814 | } | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | static int pnx8xxx_serial_remove(struct platform_device *pdev) | |
820 | { | |
821 | struct pnx8xxx_port *sport = platform_get_drvdata(pdev); | |
822 | ||
de8211b9 VW |
823 | if (sport) |
824 | uart_remove_one_port(&pnx8xxx_reg, &sport->port); | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static struct platform_driver pnx8xxx_serial_driver = { | |
830 | .driver = { | |
831 | .name = "pnx8xxx-uart", | |
de8211b9 VW |
832 | }, |
833 | .probe = pnx8xxx_serial_probe, | |
834 | .remove = pnx8xxx_serial_remove, | |
835 | .suspend = pnx8xxx_serial_suspend, | |
836 | .resume = pnx8xxx_serial_resume, | |
837 | }; | |
838 | ||
839 | static int __init pnx8xxx_serial_init(void) | |
840 | { | |
841 | int ret; | |
842 | ||
d87a6d95 | 843 | printk(KERN_INFO "Serial: PNX8XXX driver\n"); |
de8211b9 VW |
844 | |
845 | pnx8xxx_init_ports(); | |
846 | ||
847 | ret = uart_register_driver(&pnx8xxx_reg); | |
848 | if (ret == 0) { | |
849 | ret = platform_driver_register(&pnx8xxx_serial_driver); | |
850 | if (ret) | |
851 | uart_unregister_driver(&pnx8xxx_reg); | |
852 | } | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static void __exit pnx8xxx_serial_exit(void) | |
857 | { | |
858 | platform_driver_unregister(&pnx8xxx_serial_driver); | |
859 | uart_unregister_driver(&pnx8xxx_reg); | |
860 | } | |
861 | ||
862 | module_init(pnx8xxx_serial_init); | |
863 | module_exit(pnx8xxx_serial_exit); | |
864 | ||
865 | MODULE_AUTHOR("Embedded Alley Solutions, Inc."); | |
866 | MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver"); | |
867 | MODULE_LICENSE("GPL"); | |
868 | MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR); | |
e169c139 | 869 | MODULE_ALIAS("platform:pnx8xxx-uart"); |