diff options
Diffstat (limited to 'drivers/serial/serial_lh7a40x.c')
-rw-r--r-- | drivers/serial/serial_lh7a40x.c | 711 |
1 files changed, 711 insertions, 0 deletions
diff --git a/drivers/serial/serial_lh7a40x.c b/drivers/serial/serial_lh7a40x.c new file mode 100644 index 000000000000..4ce3a41f1611 --- /dev/null +++ b/drivers/serial/serial_lh7a40x.c | |||
@@ -0,0 +1,711 @@ | |||
1 | /* drivers/serial/serial_lh7a40x.c | ||
2 | * | ||
3 | * Copyright (C) 2004 Coastal Environmental Systems | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or | ||
6 | * modify it under the terms of the GNU General Public License | ||
7 | * version 2 as published by the Free Software Foundation. | ||
8 | * | ||
9 | */ | ||
10 | |||
11 | /* Driver for Sharp LH7A40X embedded serial ports | ||
12 | * | ||
13 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | ||
14 | * Based on drivers/serial/amba.c, by Deep Blue Solutions Ltd. | ||
15 | * | ||
16 | * --- | ||
17 | * | ||
18 | * This driver supports the embedded UARTs of the Sharp LH7A40X series | ||
19 | * CPUs. While similar to the 16550 and other UART chips, there is | ||
20 | * nothing close to register compatibility. Moreover, some of the | ||
21 | * modem control lines are not available, either in the chip or they | ||
22 | * are lacking in the board-level implementation. | ||
23 | * | ||
24 | * - Use of SIRDIS | ||
25 | * For simplicity, we disable the IR functions of any UART whenever | ||
26 | * we enable it. | ||
27 | * | ||
28 | */ | ||
29 | |||
30 | #include <linux/config.h> | ||
31 | |||
32 | #if defined(CONFIG_SERIAL_LH7A40X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | ||
33 | #define SUPPORT_SYSRQ | ||
34 | #endif | ||
35 | |||
36 | #include <linux/module.h> | ||
37 | #include <linux/ioport.h> | ||
38 | #include <linux/init.h> | ||
39 | #include <linux/console.h> | ||
40 | #include <linux/sysrq.h> | ||
41 | #include <linux/tty.h> | ||
42 | #include <linux/tty_flip.h> | ||
43 | #include <linux/serial_core.h> | ||
44 | #include <linux/serial.h> | ||
45 | |||
46 | #include <asm/io.h> | ||
47 | #include <asm/irq.h> | ||
48 | |||
49 | #define DEV_MAJOR 204 | ||
50 | #define DEV_MINOR 16 | ||
51 | #define DEV_NR 3 | ||
52 | |||
53 | #define ISR_LOOP_LIMIT 256 | ||
54 | |||
55 | #define UR(p,o) _UR ((p)->membase, o) | ||
56 | #define _UR(b,o) (*((volatile unsigned int*)(((unsigned char*) b) + (o)))) | ||
57 | #define BIT_CLR(p,o,m) UR(p,o) = UR(p,o) & (~(unsigned int)m) | ||
58 | #define BIT_SET(p,o,m) UR(p,o) = UR(p,o) | ( (unsigned int)m) | ||
59 | |||
60 | #define UART_REG_SIZE 32 | ||
61 | |||
62 | #define UART_R_DATA (0x00) | ||
63 | #define UART_R_FCON (0x04) | ||
64 | #define UART_R_BRCON (0x08) | ||
65 | #define UART_R_CON (0x0c) | ||
66 | #define UART_R_STATUS (0x10) | ||
67 | #define UART_R_RAWISR (0x14) | ||
68 | #define UART_R_INTEN (0x18) | ||
69 | #define UART_R_ISR (0x1c) | ||
70 | |||
71 | #define UARTEN (0x01) /* UART enable */ | ||
72 | #define SIRDIS (0x02) /* Serial IR disable (UART1 only) */ | ||
73 | |||
74 | #define RxEmpty (0x10) | ||
75 | #define TxEmpty (0x80) | ||
76 | #define TxFull (0x20) | ||
77 | #define nRxRdy RxEmpty | ||
78 | #define nTxRdy TxFull | ||
79 | #define TxBusy (0x08) | ||
80 | |||
81 | #define RxBreak (0x0800) | ||
82 | #define RxOverrunError (0x0400) | ||
83 | #define RxParityError (0x0200) | ||
84 | #define RxFramingError (0x0100) | ||
85 | #define RxError (RxBreak | RxOverrunError | RxParityError | RxFramingError) | ||
86 | |||
87 | #define DCD (0x04) | ||
88 | #define DSR (0x02) | ||
89 | #define CTS (0x01) | ||
90 | |||
91 | #define RxInt (0x01) | ||
92 | #define TxInt (0x02) | ||
93 | #define ModemInt (0x04) | ||
94 | #define RxTimeoutInt (0x08) | ||
95 | |||
96 | #define MSEOI (0x10) | ||
97 | |||
98 | #define WLEN_8 (0x60) | ||
99 | #define WLEN_7 (0x40) | ||
100 | #define WLEN_6 (0x20) | ||
101 | #define WLEN_5 (0x00) | ||
102 | #define WLEN (0x60) /* Mask for all word-length bits */ | ||
103 | #define STP2 (0x08) | ||
104 | #define PEN (0x02) /* Parity Enable */ | ||
105 | #define EPS (0x04) /* Even Parity Set */ | ||
106 | #define FEN (0x10) /* FIFO Enable */ | ||
107 | #define BRK (0x01) /* Send Break */ | ||
108 | |||
109 | |||
110 | struct uart_port_lh7a40x { | ||
111 | struct uart_port port; | ||
112 | unsigned int statusPrev; /* Most recently read modem status */ | ||
113 | }; | ||
114 | |||
115 | static void lh7a40xuart_stop_tx (struct uart_port* port, unsigned int tty_stop) | ||
116 | { | ||
117 | BIT_CLR (port, UART_R_INTEN, TxInt); | ||
118 | } | ||
119 | |||
120 | static void lh7a40xuart_start_tx (struct uart_port* port, | ||
121 | unsigned int tty_start) | ||
122 | { | ||
123 | BIT_SET (port, UART_R_INTEN, TxInt); | ||
124 | |||
125 | /* *** FIXME: do I need to check for startup of the | ||
126 | transmitter? The old driver did, but AMBA | ||
127 | doesn't . */ | ||
128 | } | ||
129 | |||
130 | static void lh7a40xuart_stop_rx (struct uart_port* port) | ||
131 | { | ||
132 | BIT_SET (port, UART_R_INTEN, RxTimeoutInt | RxInt); | ||
133 | } | ||
134 | |||
135 | static void lh7a40xuart_enable_ms (struct uart_port* port) | ||
136 | { | ||
137 | BIT_SET (port, UART_R_INTEN, ModemInt); | ||
138 | } | ||
139 | |||
140 | static void | ||
141 | #ifdef SUPPORT_SYSRQ | ||
142 | lh7a40xuart_rx_chars (struct uart_port* port, struct pt_regs* regs) | ||
143 | #else | ||
144 | lh7a40xuart_rx_chars (struct uart_port* port) | ||
145 | #endif | ||
146 | { | ||
147 | struct tty_struct* tty = port->info->tty; | ||
148 | int cbRxMax = 256; /* (Gross) limit on receive */ | ||
149 | unsigned int data, flag;/* Received data and status */ | ||
150 | |||
151 | while (!(UR (port, UART_R_STATUS) & nRxRdy) && --cbRxMax) { | ||
152 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { | ||
153 | if (tty->low_latency) | ||
154 | tty_flip_buffer_push(tty); | ||
155 | /* | ||
156 | * If this failed then we will throw away the | ||
157 | * bytes but must do so to clear interrupts | ||
158 | */ | ||
159 | } | ||
160 | |||
161 | data = UR (port, UART_R_DATA); | ||
162 | flag = TTY_NORMAL; | ||
163 | ++port->icount.rx; | ||
164 | |||
165 | if (data & RxError) { /* Quick check, short-circuit */ | ||
166 | if (data & RxBreak) { | ||
167 | data &= ~(RxFramingError | RxParityError); | ||
168 | ++port->icount.brk; | ||
169 | if (uart_handle_break (port)) | ||
170 | continue; | ||
171 | } | ||
172 | else if (data & RxParityError) | ||
173 | ++port->icount.parity; | ||
174 | else if (data & RxFramingError) | ||
175 | ++port->icount.frame; | ||
176 | if (data & RxOverrunError) | ||
177 | ++port->icount.overrun; | ||
178 | |||
179 | /* Mask by termios, leave Rx'd byte */ | ||
180 | data &= port->read_status_mask | 0xff; | ||
181 | |||
182 | if (data & RxBreak) | ||
183 | flag = TTY_BREAK; | ||
184 | else if (data & RxParityError) | ||
185 | flag = TTY_PARITY; | ||
186 | else if (data & RxFramingError) | ||
187 | flag = TTY_FRAME; | ||
188 | } | ||
189 | |||
190 | if (uart_handle_sysrq_char (port, (unsigned char) data, regs)) | ||
191 | continue; | ||
192 | |||
193 | if ((data & port->ignore_status_mask) == 0) { | ||
194 | tty_insert_flip_char(tty, data, flag); | ||
195 | } | ||
196 | if ((data & RxOverrunError) | ||
197 | && tty->flip.count < TTY_FLIPBUF_SIZE) { | ||
198 | /* | ||
199 | * Overrun is special, since it's reported | ||
200 | * immediately, and doesn't affect the current | ||
201 | * character | ||
202 | */ | ||
203 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | ||
204 | } | ||
205 | } | ||
206 | tty_flip_buffer_push (tty); | ||
207 | return; | ||
208 | } | ||
209 | |||
210 | static void lh7a40xuart_tx_chars (struct uart_port* port) | ||
211 | { | ||
212 | struct circ_buf* xmit = &port->info->xmit; | ||
213 | int cbTxMax = port->fifosize; | ||
214 | |||
215 | if (port->x_char) { | ||
216 | UR (port, UART_R_DATA) = port->x_char; | ||
217 | ++port->icount.tx; | ||
218 | port->x_char = 0; | ||
219 | return; | ||
220 | } | ||
221 | if (uart_circ_empty (xmit) || uart_tx_stopped (port)) { | ||
222 | lh7a40xuart_stop_tx (port, 0); | ||
223 | return; | ||
224 | } | ||
225 | |||
226 | /* Unlike the AMBA UART, the lh7a40x UART does not guarantee | ||
227 | that at least half of the FIFO is empty. Instead, we check | ||
228 | status for every character. Using the AMBA method causes | ||
229 | the transmitter to drop characters. */ | ||
230 | |||
231 | do { | ||
232 | UR (port, UART_R_DATA) = xmit->buf[xmit->tail]; | ||
233 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | ||
234 | ++port->icount.tx; | ||
235 | if (uart_circ_empty(xmit)) | ||
236 | break; | ||
237 | } while (!(UR (port, UART_R_STATUS) & nTxRdy) | ||
238 | && cbTxMax--); | ||
239 | |||
240 | if (uart_circ_chars_pending (xmit) < WAKEUP_CHARS) | ||
241 | uart_write_wakeup (port); | ||
242 | |||
243 | if (uart_circ_empty (xmit)) | ||
244 | lh7a40xuart_stop_tx (port, 0); | ||
245 | } | ||
246 | |||
247 | static void lh7a40xuart_modem_status (struct uart_port* port) | ||
248 | { | ||
249 | unsigned int status = UR (port, UART_R_STATUS); | ||
250 | unsigned int delta | ||
251 | = status ^ ((struct uart_port_lh7a40x*) port)->statusPrev; | ||
252 | |||
253 | BIT_SET (port, UART_R_RAWISR, MSEOI); /* Clear modem status intr */ | ||
254 | |||
255 | if (!delta) /* Only happens if we missed 2 transitions */ | ||
256 | return; | ||
257 | |||
258 | ((struct uart_port_lh7a40x*) port)->statusPrev = status; | ||
259 | |||
260 | if (delta & DCD) | ||
261 | uart_handle_dcd_change (port, status & DCD); | ||
262 | |||
263 | if (delta & DSR) | ||
264 | ++port->icount.dsr; | ||
265 | |||
266 | if (delta & CTS) | ||
267 | uart_handle_cts_change (port, status & CTS); | ||
268 | |||
269 | wake_up_interruptible (&port->info->delta_msr_wait); | ||
270 | } | ||
271 | |||
272 | static irqreturn_t lh7a40xuart_int (int irq, void* dev_id, | ||
273 | struct pt_regs* regs) | ||
274 | { | ||
275 | struct uart_port* port = dev_id; | ||
276 | unsigned int cLoopLimit = ISR_LOOP_LIMIT; | ||
277 | unsigned int isr = UR (port, UART_R_ISR); | ||
278 | |||
279 | |||
280 | do { | ||
281 | if (isr & (RxInt | RxTimeoutInt)) | ||
282 | #ifdef SUPPORT_SYSRQ | ||
283 | lh7a40xuart_rx_chars(port, regs); | ||
284 | #else | ||
285 | lh7a40xuart_rx_chars(port); | ||
286 | #endif | ||
287 | if (isr & ModemInt) | ||
288 | lh7a40xuart_modem_status (port); | ||
289 | if (isr & TxInt) | ||
290 | lh7a40xuart_tx_chars (port); | ||
291 | |||
292 | if (--cLoopLimit == 0) | ||
293 | break; | ||
294 | |||
295 | isr = UR (port, UART_R_ISR); | ||
296 | } while (isr & (RxInt | TxInt | RxTimeoutInt)); | ||
297 | |||
298 | return IRQ_HANDLED; | ||
299 | } | ||
300 | |||
301 | static unsigned int lh7a40xuart_tx_empty (struct uart_port* port) | ||
302 | { | ||
303 | return (UR (port, UART_R_STATUS) & TxEmpty) ? TIOCSER_TEMT : 0; | ||
304 | } | ||
305 | |||
306 | static unsigned int lh7a40xuart_get_mctrl (struct uart_port* port) | ||
307 | { | ||
308 | unsigned int result = 0; | ||
309 | unsigned int status = UR (port, UART_R_STATUS); | ||
310 | |||
311 | if (status & DCD) | ||
312 | result |= TIOCM_CAR; | ||
313 | if (status & DSR) | ||
314 | result |= TIOCM_DSR; | ||
315 | if (status & CTS) | ||
316 | result |= TIOCM_CTS; | ||
317 | |||
318 | return result; | ||
319 | } | ||
320 | |||
321 | static void lh7a40xuart_set_mctrl (struct uart_port* port, unsigned int mctrl) | ||
322 | { | ||
323 | /* None of the ports supports DTR. UART1 supports RTS through GPIO. */ | ||
324 | /* Note, kernel appears to be setting DTR and RTS on console. */ | ||
325 | |||
326 | /* *** FIXME: this deserves more work. There's some work in | ||
327 | tracing all of the IO pins. */ | ||
328 | #if 0 | ||
329 | if( port->mapbase == UART1_PHYS) { | ||
330 | gpioRegs_t *gpio = (gpioRegs_t *)IO_ADDRESS(GPIO_PHYS); | ||
331 | |||
332 | if (mctrl & TIOCM_RTS) | ||
333 | gpio->pbdr &= ~GPIOB_UART1_RTS; | ||
334 | else | ||
335 | gpio->pbdr |= GPIOB_UART1_RTS; | ||
336 | } | ||
337 | #endif | ||
338 | } | ||
339 | |||
340 | static void lh7a40xuart_break_ctl (struct uart_port* port, int break_state) | ||
341 | { | ||
342 | unsigned long flags; | ||
343 | |||
344 | spin_lock_irqsave(&port->lock, flags); | ||
345 | if (break_state == -1) | ||
346 | BIT_SET (port, UART_R_FCON, BRK); /* Assert break */ | ||
347 | else | ||
348 | BIT_CLR (port, UART_R_FCON, BRK); /* Deassert break */ | ||
349 | spin_unlock_irqrestore(&port->lock, flags); | ||
350 | } | ||
351 | |||
352 | static int lh7a40xuart_startup (struct uart_port* port) | ||
353 | { | ||
354 | int retval; | ||
355 | |||
356 | retval = request_irq (port->irq, lh7a40xuart_int, 0, | ||
357 | "serial_lh7a40x", port); | ||
358 | if (retval) | ||
359 | return retval; | ||
360 | |||
361 | /* Initial modem control-line settings */ | ||
362 | ((struct uart_port_lh7a40x*) port)->statusPrev | ||
363 | = UR (port, UART_R_STATUS); | ||
364 | |||
365 | /* There is presently no configuration option to enable IR. | ||
366 | Thus, we always disable it. */ | ||
367 | |||
368 | BIT_SET (port, UART_R_CON, UARTEN | SIRDIS); | ||
369 | BIT_SET (port, UART_R_INTEN, RxTimeoutInt | RxInt); | ||
370 | |||
371 | return 0; | ||
372 | } | ||
373 | |||
374 | static void lh7a40xuart_shutdown (struct uart_port* port) | ||
375 | { | ||
376 | free_irq (port->irq, port); | ||
377 | BIT_CLR (port, UART_R_FCON, BRK | FEN); | ||
378 | BIT_CLR (port, UART_R_CON, UARTEN); | ||
379 | } | ||
380 | |||
381 | static void lh7a40xuart_set_termios (struct uart_port* port, | ||
382 | struct termios* termios, | ||
383 | struct termios* old) | ||
384 | { | ||
385 | unsigned int con; | ||
386 | unsigned int inten; | ||
387 | unsigned int fcon; | ||
388 | unsigned long flags; | ||
389 | unsigned int baud; | ||
390 | unsigned int quot; | ||
391 | |||
392 | baud = uart_get_baud_rate (port, termios, old, 8, port->uartclk/16); | ||
393 | quot = uart_get_divisor (port, baud); /* -1 performed elsewhere */ | ||
394 | |||
395 | switch (termios->c_cflag & CSIZE) { | ||
396 | case CS5: | ||
397 | fcon = WLEN_5; | ||
398 | break; | ||
399 | case CS6: | ||
400 | fcon = WLEN_6; | ||
401 | break; | ||
402 | case CS7: | ||
403 | fcon = WLEN_7; | ||
404 | break; | ||
405 | case CS8: | ||
406 | default: | ||
407 | fcon = WLEN_8; | ||
408 | break; | ||
409 | } | ||
410 | if (termios->c_cflag & CSTOPB) | ||
411 | fcon |= STP2; | ||
412 | if (termios->c_cflag & PARENB) { | ||
413 | fcon |= PEN; | ||
414 | if (!(termios->c_cflag & PARODD)) | ||
415 | fcon |= EPS; | ||
416 | } | ||
417 | if (port->fifosize > 1) | ||
418 | fcon |= FEN; | ||
419 | |||
420 | spin_lock_irqsave (&port->lock, flags); | ||
421 | |||
422 | uart_update_timeout (port, termios->c_cflag, baud); | ||
423 | |||
424 | port->read_status_mask = RxOverrunError; | ||
425 | if (termios->c_iflag & INPCK) | ||
426 | port->read_status_mask |= RxFramingError | RxParityError; | ||
427 | if (termios->c_iflag & (BRKINT | PARMRK)) | ||
428 | port->read_status_mask |= RxBreak; | ||
429 | |||
430 | /* Figure mask for status we ignore */ | ||
431 | port->ignore_status_mask = 0; | ||
432 | if (termios->c_iflag & IGNPAR) | ||
433 | port->ignore_status_mask |= RxFramingError | RxParityError; | ||
434 | if (termios->c_iflag & IGNBRK) { | ||
435 | port->ignore_status_mask |= RxBreak; | ||
436 | /* Ignore overrun when ignorning parity */ | ||
437 | /* *** FIXME: is this in the right place? */ | ||
438 | if (termios->c_iflag & IGNPAR) | ||
439 | port->ignore_status_mask |= RxOverrunError; | ||
440 | } | ||
441 | |||
442 | /* Ignore all receive errors when receive disabled */ | ||
443 | if ((termios->c_cflag & CREAD) == 0) | ||
444 | port->ignore_status_mask |= RxError; | ||
445 | |||
446 | con = UR (port, UART_R_CON); | ||
447 | inten = (UR (port, UART_R_INTEN) & ~ModemInt); | ||
448 | |||
449 | if (UART_ENABLE_MS (port, termios->c_cflag)) | ||
450 | inten |= ModemInt; | ||
451 | |||
452 | BIT_CLR (port, UART_R_CON, UARTEN); /* Disable UART */ | ||
453 | UR (port, UART_R_INTEN) = 0; /* Disable interrupts */ | ||
454 | UR (port, UART_R_BRCON) = quot - 1; /* Set baud rate divisor */ | ||
455 | UR (port, UART_R_FCON) = fcon; /* Set FIFO and frame ctrl */ | ||
456 | UR (port, UART_R_INTEN) = inten; /* Enable interrupts */ | ||
457 | UR (port, UART_R_CON) = con; /* Restore UART mode */ | ||
458 | |||
459 | spin_unlock_irqrestore(&port->lock, flags); | ||
460 | } | ||
461 | |||
462 | static const char* lh7a40xuart_type (struct uart_port* port) | ||
463 | { | ||
464 | return port->type == PORT_LH7A40X ? "LH7A40X" : NULL; | ||
465 | } | ||
466 | |||
467 | static void lh7a40xuart_release_port (struct uart_port* port) | ||
468 | { | ||
469 | release_mem_region (port->mapbase, UART_REG_SIZE); | ||
470 | } | ||
471 | |||
472 | static int lh7a40xuart_request_port (struct uart_port* port) | ||
473 | { | ||
474 | return request_mem_region (port->mapbase, UART_REG_SIZE, | ||
475 | "serial_lh7a40x") != NULL | ||
476 | ? 0 : -EBUSY; | ||
477 | } | ||
478 | |||
479 | static void lh7a40xuart_config_port (struct uart_port* port, int flags) | ||
480 | { | ||
481 | if (flags & UART_CONFIG_TYPE) { | ||
482 | port->type = PORT_LH7A40X; | ||
483 | lh7a40xuart_request_port (port); | ||
484 | } | ||
485 | } | ||
486 | |||
487 | static int lh7a40xuart_verify_port (struct uart_port* port, | ||
488 | struct serial_struct* ser) | ||
489 | { | ||
490 | int ret = 0; | ||
491 | |||
492 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_LH7A40X) | ||
493 | ret = -EINVAL; | ||
494 | if (ser->irq < 0 || ser->irq >= NR_IRQS) | ||
495 | ret = -EINVAL; | ||
496 | if (ser->baud_base < 9600) /* *** FIXME: is this true? */ | ||
497 | ret = -EINVAL; | ||
498 | return ret; | ||
499 | } | ||
500 | |||
501 | static struct uart_ops lh7a40x_uart_ops = { | ||
502 | .tx_empty = lh7a40xuart_tx_empty, | ||
503 | .set_mctrl = lh7a40xuart_set_mctrl, | ||
504 | .get_mctrl = lh7a40xuart_get_mctrl, | ||
505 | .stop_tx = lh7a40xuart_stop_tx, | ||
506 | .start_tx = lh7a40xuart_start_tx, | ||
507 | .stop_rx = lh7a40xuart_stop_rx, | ||
508 | .enable_ms = lh7a40xuart_enable_ms, | ||
509 | .break_ctl = lh7a40xuart_break_ctl, | ||
510 | .startup = lh7a40xuart_startup, | ||
511 | .shutdown = lh7a40xuart_shutdown, | ||
512 | .set_termios = lh7a40xuart_set_termios, | ||
513 | .type = lh7a40xuart_type, | ||
514 | .release_port = lh7a40xuart_release_port, | ||
515 | .request_port = lh7a40xuart_request_port, | ||
516 | .config_port = lh7a40xuart_config_port, | ||
517 | .verify_port = lh7a40xuart_verify_port, | ||
518 | }; | ||
519 | |||
520 | static struct uart_port_lh7a40x lh7a40x_ports[DEV_NR] = { | ||
521 | { | ||
522 | .port = { | ||
523 | .membase = (void*) io_p2v (UART1_PHYS), | ||
524 | .mapbase = UART1_PHYS, | ||
525 | .iotype = SERIAL_IO_MEM, | ||
526 | .irq = IRQ_UART1INTR, | ||
527 | .uartclk = 14745600/2, | ||
528 | .fifosize = 16, | ||
529 | .ops = &lh7a40x_uart_ops, | ||
530 | .flags = ASYNC_BOOT_AUTOCONF, | ||
531 | .line = 0, | ||
532 | }, | ||
533 | }, | ||
534 | { | ||
535 | .port = { | ||
536 | .membase = (void*) io_p2v (UART2_PHYS), | ||
537 | .mapbase = UART2_PHYS, | ||
538 | .iotype = SERIAL_IO_MEM, | ||
539 | .irq = IRQ_UART2INTR, | ||
540 | .uartclk = 14745600/2, | ||
541 | .fifosize = 16, | ||
542 | .ops = &lh7a40x_uart_ops, | ||
543 | .flags = ASYNC_BOOT_AUTOCONF, | ||
544 | .line = 1, | ||
545 | }, | ||
546 | }, | ||
547 | { | ||
548 | .port = { | ||
549 | .membase = (void*) io_p2v (UART3_PHYS), | ||
550 | .mapbase = UART3_PHYS, | ||
551 | .iotype = SERIAL_IO_MEM, | ||
552 | .irq = IRQ_UART3INTR, | ||
553 | .uartclk = 14745600/2, | ||
554 | .fifosize = 16, | ||
555 | .ops = &lh7a40x_uart_ops, | ||
556 | .flags = ASYNC_BOOT_AUTOCONF, | ||
557 | .line = 2, | ||
558 | }, | ||
559 | }, | ||
560 | }; | ||
561 | |||
562 | #ifndef CONFIG_SERIAL_LH7A40X_CONSOLE | ||
563 | # define LH7A40X_CONSOLE NULL | ||
564 | #else | ||
565 | # define LH7A40X_CONSOLE &lh7a40x_console | ||
566 | |||
567 | |||
568 | static void lh7a40xuart_console_write (struct console* co, | ||
569 | const char* s, | ||
570 | unsigned int count) | ||
571 | { | ||
572 | struct uart_port* port = &lh7a40x_ports[co->index].port; | ||
573 | unsigned int con = UR (port, UART_R_CON); | ||
574 | unsigned int inten = UR (port, UART_R_INTEN); | ||
575 | |||
576 | |||
577 | UR (port, UART_R_INTEN) = 0; /* Disable all interrupts */ | ||
578 | BIT_SET (port, UART_R_CON, UARTEN | SIRDIS); /* Enable UART */ | ||
579 | |||
580 | for (; count-- > 0; ++s) { | ||
581 | while (UR (port, UART_R_STATUS) & nTxRdy) | ||
582 | ; | ||
583 | UR (port, UART_R_DATA) = *s; | ||
584 | if (*s == '\n') { | ||
585 | while ((UR (port, UART_R_STATUS) & TxBusy)) | ||
586 | ; | ||
587 | UR (port, UART_R_DATA) = '\r'; | ||
588 | } | ||
589 | } | ||
590 | |||
591 | /* Wait until all characters are sent */ | ||
592 | while (UR (port, UART_R_STATUS) & TxBusy) | ||
593 | ; | ||
594 | |||
595 | /* Restore control and interrupt mask */ | ||
596 | UR (port, UART_R_CON) = con; | ||
597 | UR (port, UART_R_INTEN) = inten; | ||
598 | } | ||
599 | |||
600 | static void __init lh7a40xuart_console_get_options (struct uart_port* port, | ||
601 | int* baud, | ||
602 | int* parity, | ||
603 | int* bits) | ||
604 | { | ||
605 | if (UR (port, UART_R_CON) & UARTEN) { | ||
606 | unsigned int fcon = UR (port, UART_R_FCON); | ||
607 | unsigned int quot = UR (port, UART_R_BRCON) + 1; | ||
608 | |||
609 | switch (fcon & (PEN | EPS)) { | ||
610 | default: *parity = 'n'; break; | ||
611 | case PEN: *parity = 'o'; break; | ||
612 | case PEN | EPS: *parity = 'e'; break; | ||
613 | } | ||
614 | |||
615 | switch (fcon & WLEN) { | ||
616 | default: | ||
617 | case WLEN_8: *bits = 8; break; | ||
618 | case WLEN_7: *bits = 7; break; | ||
619 | case WLEN_6: *bits = 6; break; | ||
620 | case WLEN_5: *bits = 5; break; | ||
621 | } | ||
622 | |||
623 | *baud = port->uartclk/(16*quot); | ||
624 | } | ||
625 | } | ||
626 | |||
627 | static int __init lh7a40xuart_console_setup (struct console* co, char* options) | ||
628 | { | ||
629 | struct uart_port* port; | ||
630 | int baud = 38400; | ||
631 | int bits = 8; | ||
632 | int parity = 'n'; | ||
633 | int flow = 'n'; | ||
634 | |||
635 | if (co->index >= DEV_NR) /* Bounds check on device number */ | ||
636 | co->index = 0; | ||
637 | port = &lh7a40x_ports[co->index].port; | ||
638 | |||
639 | if (options) | ||
640 | uart_parse_options (options, &baud, &parity, &bits, &flow); | ||
641 | else | ||
642 | lh7a40xuart_console_get_options (port, &baud, &parity, &bits); | ||
643 | |||
644 | return uart_set_options (port, co, baud, parity, bits, flow); | ||
645 | } | ||
646 | |||
647 | extern struct uart_driver lh7a40x_reg; | ||
648 | static struct console lh7a40x_console = { | ||
649 | .name = "ttyAM", | ||
650 | .write = lh7a40xuart_console_write, | ||
651 | .device = uart_console_device, | ||
652 | .setup = lh7a40xuart_console_setup, | ||
653 | .flags = CON_PRINTBUFFER, | ||
654 | .index = -1, | ||
655 | .data = &lh7a40x_reg, | ||
656 | }; | ||
657 | |||
658 | static int __init lh7a40xuart_console_init(void) | ||
659 | { | ||
660 | register_console (&lh7a40x_console); | ||
661 | return 0; | ||
662 | } | ||
663 | |||
664 | console_initcall (lh7a40xuart_console_init); | ||
665 | |||
666 | #endif | ||
667 | |||
668 | static struct uart_driver lh7a40x_reg = { | ||
669 | .owner = THIS_MODULE, | ||
670 | .driver_name = "ttyAM", | ||
671 | .dev_name = "ttyAM", | ||
672 | .major = DEV_MAJOR, | ||
673 | .minor = DEV_MINOR, | ||
674 | .nr = DEV_NR, | ||
675 | .cons = LH7A40X_CONSOLE, | ||
676 | }; | ||
677 | |||
678 | static int __init lh7a40xuart_init(void) | ||
679 | { | ||
680 | int ret; | ||
681 | |||
682 | printk (KERN_INFO "serial: LH7A40X serial driver\n"); | ||
683 | |||
684 | ret = uart_register_driver (&lh7a40x_reg); | ||
685 | |||
686 | if (ret == 0) { | ||
687 | int i; | ||
688 | |||
689 | for (i = 0; i < DEV_NR; i++) | ||
690 | uart_add_one_port (&lh7a40x_reg, | ||
691 | &lh7a40x_ports[i].port); | ||
692 | } | ||
693 | return ret; | ||
694 | } | ||
695 | |||
696 | static void __exit lh7a40xuart_exit(void) | ||
697 | { | ||
698 | int i; | ||
699 | |||
700 | for (i = 0; i < DEV_NR; i++) | ||
701 | uart_remove_one_port (&lh7a40x_reg, &lh7a40x_ports[i].port); | ||
702 | |||
703 | uart_unregister_driver (&lh7a40x_reg); | ||
704 | } | ||
705 | |||
706 | module_init (lh7a40xuart_init); | ||
707 | module_exit (lh7a40xuart_exit); | ||
708 | |||
709 | MODULE_AUTHOR ("Marc Singer"); | ||
710 | MODULE_DESCRIPTION ("Sharp LH7A40X serial port driver"); | ||
711 | MODULE_LICENSE ("GPL"); | ||