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eea63e0e TB |
1 | /* |
2 | * SC268xx.c: Serial driver for Philiphs SC2681/SC2692 devices. | |
3 | * | |
4 | * Copyright (C) 2006,2007 Thomas Bogendörfer (tsbogend@alpha.franken.de) | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/tty.h> | |
11 | #include <linux/tty_flip.h> | |
12 | #include <linux/major.h> | |
13 | #include <linux/circ_buf.h> | |
14 | #include <linux/serial.h> | |
15 | #include <linux/sysrq.h> | |
16 | #include <linux/console.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/irq.h> | |
221ca778 | 23 | #include <linux/io.h> |
eea63e0e | 24 | |
be282059 AS |
25 | #warning "Please try migrate to use new driver SCCNXP and report the status" \ |
26 | "in the linux-serial mailing list." | |
27 | ||
eea63e0e TB |
28 | #if defined(CONFIG_MAGIC_SYSRQ) |
29 | #define SUPPORT_SYSRQ | |
30 | #endif | |
31 | ||
32 | #include <linux/serial_core.h> | |
33 | ||
34 | #define SC26XX_MAJOR 204 | |
35 | #define SC26XX_MINOR_START 205 | |
36 | #define SC26XX_NR 2 | |
37 | ||
38 | struct uart_sc26xx_port { | |
39 | struct uart_port port[2]; | |
40 | u8 dsr_mask[2]; | |
41 | u8 cts_mask[2]; | |
42 | u8 dcd_mask[2]; | |
43 | u8 ri_mask[2]; | |
44 | u8 dtr_mask[2]; | |
45 | u8 rts_mask[2]; | |
46 | u8 imr; | |
47 | }; | |
48 | ||
49 | /* register common to both ports */ | |
50 | #define RD_ISR 0x14 | |
51 | #define RD_IPR 0x34 | |
52 | ||
53 | #define WR_ACR 0x10 | |
54 | #define WR_IMR 0x14 | |
55 | #define WR_OPCR 0x34 | |
56 | #define WR_OPR_SET 0x38 | |
57 | #define WR_OPR_CLR 0x3C | |
58 | ||
59 | /* access common register */ | |
60 | #define READ_SC(p, r) readb((p)->membase + RD_##r) | |
61 | #define WRITE_SC(p, r, v) writeb((v), (p)->membase + WR_##r) | |
62 | ||
63 | /* register per port */ | |
64 | #define RD_PORT_MRx 0x00 | |
65 | #define RD_PORT_SR 0x04 | |
66 | #define RD_PORT_RHR 0x0c | |
67 | ||
68 | #define WR_PORT_MRx 0x00 | |
69 | #define WR_PORT_CSR 0x04 | |
70 | #define WR_PORT_CR 0x08 | |
71 | #define WR_PORT_THR 0x0c | |
72 | ||
73 | /* SR bits */ | |
74 | #define SR_BREAK (1 << 7) | |
75 | #define SR_FRAME (1 << 6) | |
76 | #define SR_PARITY (1 << 5) | |
77 | #define SR_OVERRUN (1 << 4) | |
78 | #define SR_TXRDY (1 << 2) | |
79 | #define SR_RXRDY (1 << 0) | |
80 | ||
81 | #define CR_RES_MR (1 << 4) | |
82 | #define CR_RES_RX (2 << 4) | |
83 | #define CR_RES_TX (3 << 4) | |
84 | #define CR_STRT_BRK (6 << 4) | |
85 | #define CR_STOP_BRK (7 << 4) | |
86 | #define CR_DIS_TX (1 << 3) | |
87 | #define CR_ENA_TX (1 << 2) | |
88 | #define CR_DIS_RX (1 << 1) | |
89 | #define CR_ENA_RX (1 << 0) | |
90 | ||
91 | /* ISR bits */ | |
92 | #define ISR_RXRDYB (1 << 5) | |
93 | #define ISR_TXRDYB (1 << 4) | |
94 | #define ISR_RXRDYA (1 << 1) | |
95 | #define ISR_TXRDYA (1 << 0) | |
96 | ||
97 | /* IMR bits */ | |
98 | #define IMR_RXRDY (1 << 1) | |
99 | #define IMR_TXRDY (1 << 0) | |
100 | ||
101 | /* access port register */ | |
102 | static inline u8 read_sc_port(struct uart_port *p, u8 reg) | |
103 | { | |
104 | return readb(p->membase + p->line * 0x20 + reg); | |
105 | } | |
106 | ||
107 | static inline void write_sc_port(struct uart_port *p, u8 reg, u8 val) | |
108 | { | |
109 | writeb(val, p->membase + p->line * 0x20 + reg); | |
110 | } | |
111 | ||
112 | #define READ_SC_PORT(p, r) read_sc_port(p, RD_PORT_##r) | |
113 | #define WRITE_SC_PORT(p, r, v) write_sc_port(p, WR_PORT_##r, v) | |
114 | ||
115 | static void sc26xx_enable_irq(struct uart_port *port, int mask) | |
116 | { | |
117 | struct uart_sc26xx_port *up; | |
118 | int line = port->line; | |
119 | ||
120 | port -= line; | |
121 | up = container_of(port, struct uart_sc26xx_port, port[0]); | |
122 | ||
123 | up->imr |= mask << (line * 4); | |
124 | WRITE_SC(port, IMR, up->imr); | |
125 | } | |
126 | ||
127 | static void sc26xx_disable_irq(struct uart_port *port, int mask) | |
128 | { | |
129 | struct uart_sc26xx_port *up; | |
130 | int line = port->line; | |
131 | ||
132 | port -= line; | |
133 | up = container_of(port, struct uart_sc26xx_port, port[0]); | |
134 | ||
135 | up->imr &= ~(mask << (line * 4)); | |
136 | WRITE_SC(port, IMR, up->imr); | |
137 | } | |
138 | ||
139 | static struct tty_struct *receive_chars(struct uart_port *port) | |
140 | { | |
141 | struct tty_struct *tty = NULL; | |
142 | int limit = 10000; | |
143 | unsigned char ch; | |
144 | char flag; | |
145 | u8 status; | |
146 | ||
ebd2c8f6 AC |
147 | if (port->state != NULL) /* Unopened serial console */ |
148 | tty = port->state->port.tty; | |
eea63e0e TB |
149 | |
150 | while (limit-- > 0) { | |
151 | status = READ_SC_PORT(port, SR); | |
152 | if (!(status & SR_RXRDY)) | |
153 | break; | |
154 | ch = READ_SC_PORT(port, RHR); | |
155 | ||
156 | flag = TTY_NORMAL; | |
157 | port->icount.rx++; | |
158 | ||
159 | if (unlikely(status & (SR_BREAK | SR_FRAME | | |
160 | SR_PARITY | SR_OVERRUN))) { | |
161 | if (status & SR_BREAK) { | |
162 | status &= ~(SR_PARITY | SR_FRAME); | |
163 | port->icount.brk++; | |
164 | if (uart_handle_break(port)) | |
165 | continue; | |
166 | } else if (status & SR_PARITY) | |
167 | port->icount.parity++; | |
168 | else if (status & SR_FRAME) | |
169 | port->icount.frame++; | |
170 | if (status & SR_OVERRUN) | |
171 | port->icount.overrun++; | |
172 | ||
173 | status &= port->read_status_mask; | |
174 | if (status & SR_BREAK) | |
175 | flag = TTY_BREAK; | |
176 | else if (status & SR_PARITY) | |
177 | flag = TTY_PARITY; | |
178 | else if (status & SR_FRAME) | |
179 | flag = TTY_FRAME; | |
180 | } | |
181 | ||
182 | if (uart_handle_sysrq_char(port, ch)) | |
183 | continue; | |
184 | ||
185 | if (status & port->ignore_status_mask) | |
186 | continue; | |
187 | ||
188 | tty_insert_flip_char(tty, ch, flag); | |
189 | } | |
190 | return tty; | |
191 | } | |
192 | ||
193 | static void transmit_chars(struct uart_port *port) | |
194 | { | |
195 | struct circ_buf *xmit; | |
196 | ||
ebd2c8f6 | 197 | if (!port->state) |
eea63e0e TB |
198 | return; |
199 | ||
ebd2c8f6 | 200 | xmit = &port->state->xmit; |
eea63e0e TB |
201 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
202 | sc26xx_disable_irq(port, IMR_TXRDY); | |
203 | return; | |
204 | } | |
205 | while (!uart_circ_empty(xmit)) { | |
206 | if (!(READ_SC_PORT(port, SR) & SR_TXRDY)) | |
207 | break; | |
208 | ||
209 | WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]); | |
210 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
211 | port->icount.tx++; | |
212 | } | |
213 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
214 | uart_write_wakeup(port); | |
215 | } | |
216 | ||
217 | static irqreturn_t sc26xx_interrupt(int irq, void *dev_id) | |
218 | { | |
219 | struct uart_sc26xx_port *up = dev_id; | |
220 | struct tty_struct *tty; | |
221 | unsigned long flags; | |
222 | u8 isr; | |
223 | ||
224 | spin_lock_irqsave(&up->port[0].lock, flags); | |
225 | ||
226 | tty = NULL; | |
227 | isr = READ_SC(&up->port[0], ISR); | |
228 | if (isr & ISR_TXRDYA) | |
229 | transmit_chars(&up->port[0]); | |
230 | if (isr & ISR_RXRDYA) | |
231 | tty = receive_chars(&up->port[0]); | |
232 | ||
233 | spin_unlock(&up->port[0].lock); | |
234 | ||
235 | if (tty) | |
236 | tty_flip_buffer_push(tty); | |
237 | ||
238 | spin_lock(&up->port[1].lock); | |
239 | ||
240 | tty = NULL; | |
241 | if (isr & ISR_TXRDYB) | |
242 | transmit_chars(&up->port[1]); | |
243 | if (isr & ISR_RXRDYB) | |
244 | tty = receive_chars(&up->port[1]); | |
245 | ||
246 | spin_unlock_irqrestore(&up->port[1].lock, flags); | |
247 | ||
248 | if (tty) | |
249 | tty_flip_buffer_push(tty); | |
250 | ||
251 | return IRQ_HANDLED; | |
252 | } | |
253 | ||
254 | /* port->lock is not held. */ | |
255 | static unsigned int sc26xx_tx_empty(struct uart_port *port) | |
256 | { | |
257 | return (READ_SC_PORT(port, SR) & SR_TXRDY) ? TIOCSER_TEMT : 0; | |
258 | } | |
259 | ||
260 | /* port->lock held by caller. */ | |
261 | static void sc26xx_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
262 | { | |
263 | struct uart_sc26xx_port *up; | |
264 | int line = port->line; | |
265 | ||
266 | port -= line; | |
267 | up = container_of(port, struct uart_sc26xx_port, port[0]); | |
268 | ||
269 | if (up->dtr_mask[line]) { | |
270 | if (mctrl & TIOCM_DTR) | |
271 | WRITE_SC(port, OPR_SET, up->dtr_mask[line]); | |
272 | else | |
273 | WRITE_SC(port, OPR_CLR, up->dtr_mask[line]); | |
274 | } | |
275 | if (up->rts_mask[line]) { | |
276 | if (mctrl & TIOCM_RTS) | |
277 | WRITE_SC(port, OPR_SET, up->rts_mask[line]); | |
278 | else | |
279 | WRITE_SC(port, OPR_CLR, up->rts_mask[line]); | |
280 | } | |
281 | } | |
282 | ||
283 | /* port->lock is held by caller and interrupts are disabled. */ | |
284 | static unsigned int sc26xx_get_mctrl(struct uart_port *port) | |
285 | { | |
286 | struct uart_sc26xx_port *up; | |
287 | int line = port->line; | |
288 | unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR; | |
289 | u8 ipr; | |
290 | ||
291 | port -= line; | |
292 | up = container_of(port, struct uart_sc26xx_port, port[0]); | |
293 | ipr = READ_SC(port, IPR) ^ 0xff; | |
294 | ||
295 | if (up->dsr_mask[line]) { | |
296 | mctrl &= ~TIOCM_DSR; | |
297 | mctrl |= ipr & up->dsr_mask[line] ? TIOCM_DSR : 0; | |
298 | } | |
299 | if (up->cts_mask[line]) { | |
300 | mctrl &= ~TIOCM_CTS; | |
301 | mctrl |= ipr & up->cts_mask[line] ? TIOCM_CTS : 0; | |
302 | } | |
303 | if (up->dcd_mask[line]) { | |
304 | mctrl &= ~TIOCM_CAR; | |
305 | mctrl |= ipr & up->dcd_mask[line] ? TIOCM_CAR : 0; | |
306 | } | |
307 | if (up->ri_mask[line]) { | |
308 | mctrl &= ~TIOCM_RNG; | |
309 | mctrl |= ipr & up->ri_mask[line] ? TIOCM_RNG : 0; | |
310 | } | |
311 | return mctrl; | |
312 | } | |
313 | ||
314 | /* port->lock held by caller. */ | |
315 | static void sc26xx_stop_tx(struct uart_port *port) | |
316 | { | |
317 | return; | |
318 | } | |
319 | ||
320 | /* port->lock held by caller. */ | |
321 | static void sc26xx_start_tx(struct uart_port *port) | |
322 | { | |
ebd2c8f6 | 323 | struct circ_buf *xmit = &port->state->xmit; |
eea63e0e TB |
324 | |
325 | while (!uart_circ_empty(xmit)) { | |
326 | if (!(READ_SC_PORT(port, SR) & SR_TXRDY)) { | |
327 | sc26xx_enable_irq(port, IMR_TXRDY); | |
328 | break; | |
329 | } | |
330 | WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]); | |
331 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
332 | port->icount.tx++; | |
333 | } | |
334 | } | |
335 | ||
336 | /* port->lock held by caller. */ | |
337 | static void sc26xx_stop_rx(struct uart_port *port) | |
338 | { | |
339 | } | |
340 | ||
341 | /* port->lock held by caller. */ | |
342 | static void sc26xx_enable_ms(struct uart_port *port) | |
343 | { | |
344 | } | |
345 | ||
346 | /* port->lock is not held. */ | |
347 | static void sc26xx_break_ctl(struct uart_port *port, int break_state) | |
348 | { | |
349 | if (break_state == -1) | |
350 | WRITE_SC_PORT(port, CR, CR_STRT_BRK); | |
351 | else | |
352 | WRITE_SC_PORT(port, CR, CR_STOP_BRK); | |
353 | } | |
354 | ||
355 | /* port->lock is not held. */ | |
356 | static int sc26xx_startup(struct uart_port *port) | |
357 | { | |
358 | sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY); | |
359 | WRITE_SC(port, OPCR, 0); | |
360 | ||
361 | /* reset tx and rx */ | |
362 | WRITE_SC_PORT(port, CR, CR_RES_RX); | |
363 | WRITE_SC_PORT(port, CR, CR_RES_TX); | |
364 | ||
365 | /* start rx/tx */ | |
366 | WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX); | |
367 | ||
368 | /* enable irqs */ | |
369 | sc26xx_enable_irq(port, IMR_RXRDY); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* port->lock is not held. */ | |
374 | static void sc26xx_shutdown(struct uart_port *port) | |
375 | { | |
376 | /* disable interrupst */ | |
377 | sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY); | |
378 | ||
379 | /* stop tx/rx */ | |
380 | WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX); | |
381 | } | |
382 | ||
383 | /* port->lock is not held. */ | |
384 | static void sc26xx_set_termios(struct uart_port *port, struct ktermios *termios, | |
385 | struct ktermios *old) | |
386 | { | |
387 | unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000); | |
388 | unsigned int quot = uart_get_divisor(port, baud); | |
389 | unsigned int iflag, cflag; | |
390 | unsigned long flags; | |
391 | u8 mr1, mr2, csr; | |
392 | ||
393 | spin_lock_irqsave(&port->lock, flags); | |
394 | ||
395 | while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc) | |
396 | udelay(2); | |
397 | ||
398 | WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX); | |
399 | ||
400 | iflag = termios->c_iflag; | |
401 | cflag = termios->c_cflag; | |
402 | ||
403 | port->read_status_mask = SR_OVERRUN; | |
404 | if (iflag & INPCK) | |
405 | port->read_status_mask |= SR_PARITY | SR_FRAME; | |
406 | if (iflag & (BRKINT | PARMRK)) | |
407 | port->read_status_mask |= SR_BREAK; | |
408 | ||
409 | port->ignore_status_mask = 0; | |
410 | if (iflag & IGNBRK) | |
411 | port->ignore_status_mask |= SR_BREAK; | |
412 | if ((cflag & CREAD) == 0) | |
413 | port->ignore_status_mask |= SR_BREAK | SR_FRAME | | |
414 | SR_PARITY | SR_OVERRUN; | |
415 | ||
416 | switch (cflag & CSIZE) { | |
417 | case CS5: | |
418 | mr1 = 0x00; | |
419 | break; | |
420 | case CS6: | |
421 | mr1 = 0x01; | |
422 | break; | |
423 | case CS7: | |
424 | mr1 = 0x02; | |
425 | break; | |
426 | default: | |
427 | case CS8: | |
428 | mr1 = 0x03; | |
429 | break; | |
430 | } | |
431 | mr2 = 0x07; | |
432 | if (cflag & CSTOPB) | |
433 | mr2 = 0x0f; | |
434 | if (cflag & PARENB) { | |
435 | if (cflag & PARODD) | |
436 | mr1 |= (1 << 2); | |
437 | } else | |
438 | mr1 |= (2 << 3); | |
439 | ||
440 | switch (baud) { | |
441 | case 50: | |
442 | csr = 0x00; | |
443 | break; | |
444 | case 110: | |
445 | csr = 0x11; | |
446 | break; | |
447 | case 134: | |
448 | csr = 0x22; | |
449 | break; | |
450 | case 200: | |
451 | csr = 0x33; | |
452 | break; | |
453 | case 300: | |
454 | csr = 0x44; | |
455 | break; | |
456 | case 600: | |
457 | csr = 0x55; | |
458 | break; | |
459 | case 1200: | |
460 | csr = 0x66; | |
461 | break; | |
462 | case 2400: | |
463 | csr = 0x88; | |
464 | break; | |
465 | case 4800: | |
466 | csr = 0x99; | |
467 | break; | |
468 | default: | |
469 | case 9600: | |
470 | csr = 0xbb; | |
471 | break; | |
472 | case 19200: | |
473 | csr = 0xcc; | |
474 | break; | |
475 | } | |
476 | ||
477 | WRITE_SC_PORT(port, CR, CR_RES_MR); | |
478 | WRITE_SC_PORT(port, MRx, mr1); | |
479 | WRITE_SC_PORT(port, MRx, mr2); | |
480 | ||
481 | WRITE_SC(port, ACR, 0x80); | |
482 | WRITE_SC_PORT(port, CSR, csr); | |
483 | ||
484 | /* reset tx and rx */ | |
485 | WRITE_SC_PORT(port, CR, CR_RES_RX); | |
486 | WRITE_SC_PORT(port, CR, CR_RES_TX); | |
487 | ||
488 | WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX); | |
489 | while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc) | |
490 | udelay(2); | |
491 | ||
492 | /* XXX */ | |
493 | uart_update_timeout(port, cflag, | |
494 | (port->uartclk / (16 * quot))); | |
495 | ||
496 | spin_unlock_irqrestore(&port->lock, flags); | |
497 | } | |
498 | ||
499 | static const char *sc26xx_type(struct uart_port *port) | |
500 | { | |
501 | return "SC26XX"; | |
502 | } | |
503 | ||
504 | static void sc26xx_release_port(struct uart_port *port) | |
505 | { | |
506 | } | |
507 | ||
508 | static int sc26xx_request_port(struct uart_port *port) | |
509 | { | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static void sc26xx_config_port(struct uart_port *port, int flags) | |
514 | { | |
515 | } | |
516 | ||
517 | static int sc26xx_verify_port(struct uart_port *port, struct serial_struct *ser) | |
518 | { | |
519 | return -EINVAL; | |
520 | } | |
521 | ||
522 | static struct uart_ops sc26xx_ops = { | |
523 | .tx_empty = sc26xx_tx_empty, | |
524 | .set_mctrl = sc26xx_set_mctrl, | |
525 | .get_mctrl = sc26xx_get_mctrl, | |
526 | .stop_tx = sc26xx_stop_tx, | |
527 | .start_tx = sc26xx_start_tx, | |
528 | .stop_rx = sc26xx_stop_rx, | |
529 | .enable_ms = sc26xx_enable_ms, | |
530 | .break_ctl = sc26xx_break_ctl, | |
531 | .startup = sc26xx_startup, | |
532 | .shutdown = sc26xx_shutdown, | |
533 | .set_termios = sc26xx_set_termios, | |
534 | .type = sc26xx_type, | |
535 | .release_port = sc26xx_release_port, | |
536 | .request_port = sc26xx_request_port, | |
537 | .config_port = sc26xx_config_port, | |
538 | .verify_port = sc26xx_verify_port, | |
539 | }; | |
540 | ||
541 | static struct uart_port *sc26xx_port; | |
542 | ||
543 | #ifdef CONFIG_SERIAL_SC26XX_CONSOLE | |
544 | static void sc26xx_console_putchar(struct uart_port *port, char c) | |
545 | { | |
546 | unsigned long flags; | |
547 | int limit = 1000000; | |
548 | ||
549 | spin_lock_irqsave(&port->lock, flags); | |
550 | ||
551 | while (limit-- > 0) { | |
552 | if (READ_SC_PORT(port, SR) & SR_TXRDY) { | |
553 | WRITE_SC_PORT(port, THR, c); | |
554 | break; | |
555 | } | |
556 | udelay(2); | |
557 | } | |
558 | ||
559 | spin_unlock_irqrestore(&port->lock, flags); | |
560 | } | |
561 | ||
562 | static void sc26xx_console_write(struct console *con, const char *s, unsigned n) | |
563 | { | |
564 | struct uart_port *port = sc26xx_port; | |
565 | int i; | |
566 | ||
567 | for (i = 0; i < n; i++) { | |
568 | if (*s == '\n') | |
569 | sc26xx_console_putchar(port, '\r'); | |
570 | sc26xx_console_putchar(port, *s++); | |
571 | } | |
572 | } | |
573 | ||
574 | static int __init sc26xx_console_setup(struct console *con, char *options) | |
575 | { | |
576 | struct uart_port *port = sc26xx_port; | |
577 | int baud = 9600; | |
578 | int bits = 8; | |
579 | int parity = 'n'; | |
580 | int flow = 'n'; | |
581 | ||
582 | if (port->type != PORT_SC26XX) | |
583 | return -1; | |
584 | ||
585 | printk(KERN_INFO "Console: ttySC%d (SC26XX)\n", con->index); | |
586 | if (options) | |
587 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
588 | ||
589 | return uart_set_options(port, con, baud, parity, bits, flow); | |
590 | } | |
591 | ||
592 | static struct uart_driver sc26xx_reg; | |
593 | static struct console sc26xx_console = { | |
594 | .name = "ttySC", | |
595 | .write = sc26xx_console_write, | |
596 | .device = uart_console_device, | |
597 | .setup = sc26xx_console_setup, | |
598 | .flags = CON_PRINTBUFFER, | |
599 | .index = -1, | |
600 | .data = &sc26xx_reg, | |
601 | }; | |
602 | #define SC26XX_CONSOLE &sc26xx_console | |
603 | #else | |
604 | #define SC26XX_CONSOLE NULL | |
605 | #endif | |
606 | ||
607 | static struct uart_driver sc26xx_reg = { | |
608 | .owner = THIS_MODULE, | |
609 | .driver_name = "SC26xx", | |
610 | .dev_name = "ttySC", | |
611 | .major = SC26XX_MAJOR, | |
612 | .minor = SC26XX_MINOR_START, | |
613 | .nr = SC26XX_NR, | |
614 | .cons = SC26XX_CONSOLE, | |
615 | }; | |
616 | ||
617 | static u8 sc26xx_flags2mask(unsigned int flags, unsigned int bitpos) | |
618 | { | |
619 | unsigned int bit = (flags >> bitpos) & 15; | |
620 | ||
621 | return bit ? (1 << (bit - 1)) : 0; | |
622 | } | |
623 | ||
9671f099 | 624 | static void sc26xx_init_masks(struct uart_sc26xx_port *up, |
eea63e0e TB |
625 | int line, unsigned int data) |
626 | { | |
627 | up->dtr_mask[line] = sc26xx_flags2mask(data, 0); | |
628 | up->rts_mask[line] = sc26xx_flags2mask(data, 4); | |
629 | up->dsr_mask[line] = sc26xx_flags2mask(data, 8); | |
630 | up->cts_mask[line] = sc26xx_flags2mask(data, 12); | |
631 | up->dcd_mask[line] = sc26xx_flags2mask(data, 16); | |
632 | up->ri_mask[line] = sc26xx_flags2mask(data, 20); | |
633 | } | |
634 | ||
9671f099 | 635 | static int sc26xx_probe(struct platform_device *dev) |
eea63e0e TB |
636 | { |
637 | struct resource *res; | |
638 | struct uart_sc26xx_port *up; | |
639 | unsigned int *sc26xx_data = dev->dev.platform_data; | |
640 | int err; | |
641 | ||
642 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
643 | if (!res) | |
644 | return -ENODEV; | |
645 | ||
646 | up = kzalloc(sizeof *up, GFP_KERNEL); | |
647 | if (unlikely(!up)) | |
648 | return -ENOMEM; | |
649 | ||
650 | up->port[0].line = 0; | |
651 | up->port[0].ops = &sc26xx_ops; | |
652 | up->port[0].type = PORT_SC26XX; | |
653 | up->port[0].uartclk = (29491200 / 16); /* arbitrary */ | |
654 | ||
655 | up->port[0].mapbase = res->start; | |
656 | up->port[0].membase = ioremap_nocache(up->port[0].mapbase, 0x40); | |
657 | up->port[0].iotype = UPIO_MEM; | |
658 | up->port[0].irq = platform_get_irq(dev, 0); | |
659 | ||
660 | up->port[0].dev = &dev->dev; | |
661 | ||
662 | sc26xx_init_masks(up, 0, sc26xx_data[0]); | |
663 | ||
664 | sc26xx_port = &up->port[0]; | |
665 | ||
666 | up->port[1].line = 1; | |
667 | up->port[1].ops = &sc26xx_ops; | |
668 | up->port[1].type = PORT_SC26XX; | |
669 | up->port[1].uartclk = (29491200 / 16); /* arbitrary */ | |
670 | ||
671 | up->port[1].mapbase = up->port[0].mapbase; | |
672 | up->port[1].membase = up->port[0].membase; | |
673 | up->port[1].iotype = UPIO_MEM; | |
674 | up->port[1].irq = up->port[0].irq; | |
675 | ||
676 | up->port[1].dev = &dev->dev; | |
677 | ||
678 | sc26xx_init_masks(up, 1, sc26xx_data[1]); | |
679 | ||
680 | err = uart_register_driver(&sc26xx_reg); | |
681 | if (err) | |
682 | goto out_free_port; | |
683 | ||
684 | sc26xx_reg.tty_driver->name_base = sc26xx_reg.minor; | |
685 | ||
686 | err = uart_add_one_port(&sc26xx_reg, &up->port[0]); | |
687 | if (err) | |
688 | goto out_unregister_driver; | |
689 | ||
690 | err = uart_add_one_port(&sc26xx_reg, &up->port[1]); | |
691 | if (err) | |
692 | goto out_remove_port0; | |
693 | ||
694 | err = request_irq(up->port[0].irq, sc26xx_interrupt, 0, "sc26xx", up); | |
695 | if (err) | |
696 | goto out_remove_ports; | |
697 | ||
698 | dev_set_drvdata(&dev->dev, up); | |
699 | return 0; | |
700 | ||
701 | out_remove_ports: | |
702 | uart_remove_one_port(&sc26xx_reg, &up->port[1]); | |
703 | out_remove_port0: | |
704 | uart_remove_one_port(&sc26xx_reg, &up->port[0]); | |
705 | ||
706 | out_unregister_driver: | |
707 | uart_unregister_driver(&sc26xx_reg); | |
708 | ||
709 | out_free_port: | |
710 | kfree(up); | |
711 | sc26xx_port = NULL; | |
712 | return err; | |
713 | } | |
714 | ||
715 | ||
716 | static int __exit sc26xx_driver_remove(struct platform_device *dev) | |
717 | { | |
718 | struct uart_sc26xx_port *up = dev_get_drvdata(&dev->dev); | |
719 | ||
720 | free_irq(up->port[0].irq, up); | |
721 | ||
722 | uart_remove_one_port(&sc26xx_reg, &up->port[0]); | |
723 | uart_remove_one_port(&sc26xx_reg, &up->port[1]); | |
724 | ||
725 | uart_unregister_driver(&sc26xx_reg); | |
726 | ||
727 | kfree(up); | |
728 | sc26xx_port = NULL; | |
729 | ||
730 | dev_set_drvdata(&dev->dev, NULL); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static struct platform_driver sc26xx_driver = { | |
735 | .probe = sc26xx_probe, | |
2d47b716 | 736 | .remove = sc26xx_driver_remove, |
eea63e0e TB |
737 | .driver = { |
738 | .name = "SC26xx", | |
e169c139 | 739 | .owner = THIS_MODULE, |
eea63e0e TB |
740 | }, |
741 | }; | |
742 | ||
c8381c15 | 743 | module_platform_driver(sc26xx_driver); |
eea63e0e TB |
744 | |
745 | MODULE_AUTHOR("Thomas Bogendörfer"); | |
746 | MODULE_DESCRIPTION("SC681/SC2692 serial driver"); | |
747 | MODULE_VERSION("1.0"); | |
748 | MODULE_LICENSE("GPL"); | |
e169c139 | 749 | MODULE_ALIAS("platform:SC26xx"); |