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of: Remove duplicate fields from of_platform_driver
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / cpm_uart / cpm_uart_core.c
blob9eb62a256e9a675af529475d178c7925e6de5302
1 /*
2 * linux/drivers/serial/cpm_uart.c
3 *
4 * Driver for CPM (SCC/SMC) serial ports; core driver
5 *
6 * Based on arch/ppc/cpm2_io/uart.c by Dan Malek
7 * Based on ppc8xx.c by Thomas Gleixner
8 * Based on drivers/serial/amba.c by Russell King
9 *
10 * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
11 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
12 *
13 * Copyright (C) 2004, 2007 Freescale Semiconductor, Inc.
14 * (C) 2004 Intracom, S.A.
15 * (C) 2005-2006 MontaVista Software, Inc.
16 * Vitaly Bordug <vbordug@ru.mvista.com>
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 *
32 */
33
34 #include <linux/module.h>
35 #include <linux/tty.h>
36 #include <linux/ioport.h>
37 #include <linux/init.h>
38 #include <linux/serial.h>
39 #include <linux/console.h>
40 #include <linux/sysrq.h>
41 #include <linux/device.h>
42 #include <linux/bootmem.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/fs_uart_pd.h>
45 #include <linux/of_platform.h>
46 #include <linux/gpio.h>
47 #include <linux/of_gpio.h>
48 #include <linux/clk.h>
49
50 #include <asm/io.h>
51 #include <asm/irq.h>
52 #include <asm/delay.h>
53 #include <asm/fs_pd.h>
54 #include <asm/udbg.h>
55
56 #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
57 #define SUPPORT_SYSRQ
58 #endif
59
60 #include <linux/serial_core.h>
61 #include <linux/kernel.h>
62
63 #include "cpm_uart.h"
64
65
66 /**************************************************************/
67
68 static int cpm_uart_tx_pump(struct uart_port *port);
69 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo);
70 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo);
71 static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
72
73 /**************************************************************/
74
75 /*
76 * Check, if transmit buffers are processed
77 */
78 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
79 {
80 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
81 cbd_t __iomem *bdp = pinfo->tx_bd_base;
82 int ret = 0;
83
84 while (1) {
85 if (in_be16(&bdp->cbd_sc) & BD_SC_READY)
86 break;
87
88 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP) {
89 ret = TIOCSER_TEMT;
90 break;
91 }
92 bdp++;
93 }
94
95 pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
96
97 return ret;
98 }
99
100 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
101 {
102 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
103
104 if (pinfo->gpios[GPIO_RTS] >= 0)
105 gpio_set_value(pinfo->gpios[GPIO_RTS], !(mctrl & TIOCM_RTS));
106
107 if (pinfo->gpios[GPIO_DTR] >= 0)
108 gpio_set_value(pinfo->gpios[GPIO_DTR], !(mctrl & TIOCM_DTR));
109 }
110
111 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
112 {
113 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
114 unsigned int mctrl = TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
115
116 if (pinfo->gpios[GPIO_CTS] >= 0) {
117 if (gpio_get_value(pinfo->gpios[GPIO_CTS]))
118 mctrl &= ~TIOCM_CTS;
119 }
120
121 if (pinfo->gpios[GPIO_DSR] >= 0) {
122 if (gpio_get_value(pinfo->gpios[GPIO_DSR]))
123 mctrl &= ~TIOCM_DSR;
124 }
125
126 if (pinfo->gpios[GPIO_DCD] >= 0) {
127 if (gpio_get_value(pinfo->gpios[GPIO_DCD]))
128 mctrl &= ~TIOCM_CAR;
129 }
130
131 if (pinfo->gpios[GPIO_RI] >= 0) {
132 if (!gpio_get_value(pinfo->gpios[GPIO_RI]))
133 mctrl |= TIOCM_RNG;
134 }
135
136 return mctrl;
137 }
138
139 /*
140 * Stop transmitter
141 */
142 static void cpm_uart_stop_tx(struct uart_port *port)
143 {
144 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
145 smc_t __iomem *smcp = pinfo->smcp;
146 scc_t __iomem *sccp = pinfo->sccp;
147
148 pr_debug("CPM uart[%d]:stop tx\n", port->line);
149
150 if (IS_SMC(pinfo))
151 clrbits8(&smcp->smc_smcm, SMCM_TX);
152 else
153 clrbits16(&sccp->scc_sccm, UART_SCCM_TX);
154 }
155
156 /*
157 * Start transmitter
158 */
159 static void cpm_uart_start_tx(struct uart_port *port)
160 {
161 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
162 smc_t __iomem *smcp = pinfo->smcp;
163 scc_t __iomem *sccp = pinfo->sccp;
164
165 pr_debug("CPM uart[%d]:start tx\n", port->line);
166
167 if (IS_SMC(pinfo)) {
168 if (in_8(&smcp->smc_smcm) & SMCM_TX)
169 return;
170 } else {
171 if (in_be16(&sccp->scc_sccm) & UART_SCCM_TX)
172 return;
173 }
174
175 if (cpm_uart_tx_pump(port) != 0) {
176 if (IS_SMC(pinfo)) {
177 setbits8(&smcp->smc_smcm, SMCM_TX);
178 } else {
179 setbits16(&sccp->scc_sccm, UART_SCCM_TX);
180 }
181 }
182 }
183
184 /*
185 * Stop receiver
186 */
187 static void cpm_uart_stop_rx(struct uart_port *port)
188 {
189 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
190 smc_t __iomem *smcp = pinfo->smcp;
191 scc_t __iomem *sccp = pinfo->sccp;
192
193 pr_debug("CPM uart[%d]:stop rx\n", port->line);
194
195 if (IS_SMC(pinfo))
196 clrbits8(&smcp->smc_smcm, SMCM_RX);
197 else
198 clrbits16(&sccp->scc_sccm, UART_SCCM_RX);
199 }
200
201 /*
202 * Enable Modem status interrupts
203 */
204 static void cpm_uart_enable_ms(struct uart_port *port)
205 {
206 pr_debug("CPM uart[%d]:enable ms\n", port->line);
207 }
208
209 /*
210 * Generate a break.
211 */
212 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
213 {
214 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
215
216 pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
217 break_state);
218
219 if (break_state)
220 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
221 else
222 cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
223 }
224
225 /*
226 * Transmit characters, refill buffer descriptor, if possible
227 */
228 static void cpm_uart_int_tx(struct uart_port *port)
229 {
230 pr_debug("CPM uart[%d]:TX INT\n", port->line);
231
232 cpm_uart_tx_pump(port);
233 }
234
235 #ifdef CONFIG_CONSOLE_POLL
236 static int serial_polled;
237 #endif
238
239 /*
240 * Receive characters
241 */
242 static void cpm_uart_int_rx(struct uart_port *port)
243 {
244 int i;
245 unsigned char ch;
246 u8 *cp;
247 struct tty_struct *tty = port->state->port.tty;
248 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
249 cbd_t __iomem *bdp;
250 u16 status;
251 unsigned int flg;
252
253 pr_debug("CPM uart[%d]:RX INT\n", port->line);
254
255 /* Just loop through the closed BDs and copy the characters into
256 * the buffer.
257 */
258 bdp = pinfo->rx_cur;
259 for (;;) {
260 #ifdef CONFIG_CONSOLE_POLL
261 if (unlikely(serial_polled)) {
262 serial_polled = 0;
263 return;
264 }
265 #endif
266 /* get status */
267 status = in_be16(&bdp->cbd_sc);
268 /* If this one is empty, return happy */
269 if (status & BD_SC_EMPTY)
270 break;
271
272 /* get number of characters, and check spce in flip-buffer */
273 i = in_be16(&bdp->cbd_datlen);
274
275 /* If we have not enough room in tty flip buffer, then we try
276 * later, which will be the next rx-interrupt or a timeout
277 */
278 if(tty_buffer_request_room(tty, i) < i) {
279 printk(KERN_WARNING "No room in flip buffer\n");
280 return;
281 }
282
283 /* get pointer */
284 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
285
286 /* loop through the buffer */
287 while (i-- > 0) {
288 ch = *cp++;
289 port->icount.rx++;
290 flg = TTY_NORMAL;
291
292 if (status &
293 (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
294 goto handle_error;
295 if (uart_handle_sysrq_char(port, ch))
296 continue;
297 #ifdef CONFIG_CONSOLE_POLL
298 if (unlikely(serial_polled)) {
299 serial_polled = 0;
300 return;
301 }
302 #endif
303 error_return:
304 tty_insert_flip_char(tty, ch, flg);
305
306 } /* End while (i--) */
307
308 /* This BD is ready to be used again. Clear status. get next */
309 clrbits16(&bdp->cbd_sc, BD_SC_BR | BD_SC_FR | BD_SC_PR |
310 BD_SC_OV | BD_SC_ID);
311 setbits16(&bdp->cbd_sc, BD_SC_EMPTY);
312
313 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
314 bdp = pinfo->rx_bd_base;
315 else
316 bdp++;
317
318 } /* End for (;;) */
319
320 /* Write back buffer pointer */
321 pinfo->rx_cur = bdp;
322
323 /* activate BH processing */
324 tty_flip_buffer_push(tty);
325
326 return;
327
328 /* Error processing */
329
330 handle_error:
331 /* Statistics */
332 if (status & BD_SC_BR)
333 port->icount.brk++;
334 if (status & BD_SC_PR)
335 port->icount.parity++;
336 if (status & BD_SC_FR)
337 port->icount.frame++;
338 if (status & BD_SC_OV)
339 port->icount.overrun++;
340
341 /* Mask out ignored conditions */
342 status &= port->read_status_mask;
343
344 /* Handle the remaining ones */
345 if (status & BD_SC_BR)
346 flg = TTY_BREAK;
347 else if (status & BD_SC_PR)
348 flg = TTY_PARITY;
349 else if (status & BD_SC_FR)
350 flg = TTY_FRAME;
351
352 /* overrun does not affect the current character ! */
353 if (status & BD_SC_OV) {
354 ch = 0;
355 flg = TTY_OVERRUN;
356 /* We skip this buffer */
357 /* CHECK: Is really nothing senseful there */
358 /* ASSUMPTION: it contains nothing valid */
359 i = 0;
360 }
361 #ifdef SUPPORT_SYSRQ
362 port->sysrq = 0;
363 #endif
364 goto error_return;
365 }
366
367 /*
368 * Asynchron mode interrupt handler
369 */
370 static irqreturn_t cpm_uart_int(int irq, void *data)
371 {
372 u8 events;
373 struct uart_port *port = data;
374 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
375 smc_t __iomem *smcp = pinfo->smcp;
376 scc_t __iomem *sccp = pinfo->sccp;
377
378 pr_debug("CPM uart[%d]:IRQ\n", port->line);
379
380 if (IS_SMC(pinfo)) {
381 events = in_8(&smcp->smc_smce);
382 out_8(&smcp->smc_smce, events);
383 if (events & SMCM_BRKE)
384 uart_handle_break(port);
385 if (events & SMCM_RX)
386 cpm_uart_int_rx(port);
387 if (events & SMCM_TX)
388 cpm_uart_int_tx(port);
389 } else {
390 events = in_be16(&sccp->scc_scce);
391 out_be16(&sccp->scc_scce, events);
392 if (events & UART_SCCM_BRKE)
393 uart_handle_break(port);
394 if (events & UART_SCCM_RX)
395 cpm_uart_int_rx(port);
396 if (events & UART_SCCM_TX)
397 cpm_uart_int_tx(port);
398 }
399 return (events) ? IRQ_HANDLED : IRQ_NONE;
400 }
401
402 static int cpm_uart_startup(struct uart_port *port)
403 {
404 int retval;
405 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
406
407 pr_debug("CPM uart[%d]:startup\n", port->line);
408
409 /* If the port is not the console, make sure rx is disabled. */
410 if (!(pinfo->flags & FLAG_CONSOLE)) {
411 /* Disable UART rx */
412 if (IS_SMC(pinfo)) {
413 clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN);
414 clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
415 } else {
416 clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR);
417 clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
418 }
419 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
420 }
421 /* Install interrupt handler. */
422 retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
423 if (retval)
424 return retval;
425
426 /* Startup rx-int */
427 if (IS_SMC(pinfo)) {
428 setbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
429 setbits16(&pinfo->smcp->smc_smcmr, (SMCMR_REN | SMCMR_TEN));
430 } else {
431 setbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
432 setbits32(&pinfo->sccp->scc_gsmrl, (SCC_GSMRL_ENR | SCC_GSMRL_ENT));
433 }
434
435 return 0;
436 }
437
438 inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
439 {
440 set_current_state(TASK_UNINTERRUPTIBLE);
441 schedule_timeout(pinfo->wait_closing);
442 }
443
444 /*
445 * Shutdown the uart
446 */
447 static void cpm_uart_shutdown(struct uart_port *port)
448 {
449 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
450
451 pr_debug("CPM uart[%d]:shutdown\n", port->line);
452
453 /* free interrupt handler */
454 free_irq(port->irq, port);
455
456 /* If the port is not the console, disable Rx and Tx. */
457 if (!(pinfo->flags & FLAG_CONSOLE)) {
458 /* Wait for all the BDs marked sent */
459 while(!cpm_uart_tx_empty(port)) {
460 set_current_state(TASK_UNINTERRUPTIBLE);
461 schedule_timeout(2);
462 }
463
464 if (pinfo->wait_closing)
465 cpm_uart_wait_until_send(pinfo);
466
467 /* Stop uarts */
468 if (IS_SMC(pinfo)) {
469 smc_t __iomem *smcp = pinfo->smcp;
470 clrbits16(&smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
471 clrbits8(&smcp->smc_smcm, SMCM_RX | SMCM_TX);
472 } else {
473 scc_t __iomem *sccp = pinfo->sccp;
474 clrbits32(&sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
475 clrbits16(&sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
476 }
477
478 /* Shut them really down and reinit buffer descriptors */
479 if (IS_SMC(pinfo)) {
480 out_be16(&pinfo->smcup->smc_brkcr, 0);
481 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
482 } else {
483 out_be16(&pinfo->sccup->scc_brkcr, 0);
484 cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
485 }
486
487 cpm_uart_initbd(pinfo);
488 }
489 }
490
491 static void cpm_uart_set_termios(struct uart_port *port,
492 struct ktermios *termios,
493 struct ktermios *old)
494 {
495 int baud;
496 unsigned long flags;
497 u16 cval, scval, prev_mode;
498 int bits, sbits;
499 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
500 smc_t __iomem *smcp = pinfo->smcp;
501 scc_t __iomem *sccp = pinfo->sccp;
502
503 pr_debug("CPM uart[%d]:set_termios\n", port->line);
504
505 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
506
507 /* Character length programmed into the mode register is the
508 * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
509 * 1 or 2 stop bits, minus 1.
510 * The value 'bits' counts this for us.
511 */
512 cval = 0;
513 scval = 0;
514
515 /* byte size */
516 switch (termios->c_cflag & CSIZE) {
517 case CS5:
518 bits = 5;
519 break;
520 case CS6:
521 bits = 6;
522 break;
523 case CS7:
524 bits = 7;
525 break;
526 case CS8:
527 bits = 8;
528 break;
529 /* Never happens, but GCC is too dumb to figure it out */
530 default:
531 bits = 8;
532 break;
533 }
534 sbits = bits - 5;
535
536 if (termios->c_cflag & CSTOPB) {
537 cval |= SMCMR_SL; /* Two stops */
538 scval |= SCU_PSMR_SL;
539 bits++;
540 }
541
542 if (termios->c_cflag & PARENB) {
543 cval |= SMCMR_PEN;
544 scval |= SCU_PSMR_PEN;
545 bits++;
546 if (!(termios->c_cflag & PARODD)) {
547 cval |= SMCMR_PM_EVEN;
548 scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
549 }
550 }
551
552 /*
553 * Update the timeout
554 */
555 uart_update_timeout(port, termios->c_cflag, baud);
556
557 /*
558 * Set up parity check flag
559 */
560 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
561
562 port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
563 if (termios->c_iflag & INPCK)
564 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
565 if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
566 port->read_status_mask |= BD_SC_BR;
567
568 /*
569 * Characters to ignore
570 */
571 port->ignore_status_mask = 0;
572 if (termios->c_iflag & IGNPAR)
573 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
574 if (termios->c_iflag & IGNBRK) {
575 port->ignore_status_mask |= BD_SC_BR;
576 /*
577 * If we're ignore parity and break indicators, ignore
578 * overruns too. (For real raw support).
579 */
580 if (termios->c_iflag & IGNPAR)
581 port->ignore_status_mask |= BD_SC_OV;
582 }
583 /*
584 * !!! ignore all characters if CREAD is not set
585 */
586 if ((termios->c_cflag & CREAD) == 0)
587 port->read_status_mask &= ~BD_SC_EMPTY;
588
589 spin_lock_irqsave(&port->lock, flags);
590
591 /* Start bit has not been added (so don't, because we would just
592 * subtract it later), and we need to add one for the number of
593 * stops bits (there is always at least one).
594 */
595 bits++;
596 if (IS_SMC(pinfo)) {
597 /* Set the mode register. We want to keep a copy of the
598 * enables, because we want to put them back if they were
599 * present.
600 */
601 prev_mode = in_be16(&smcp->smc_smcmr) & (SMCMR_REN | SMCMR_TEN);
602 /* Output in *one* operation, so we don't interrupt RX/TX if they
603 * were already enabled. */
604 out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval |
605 SMCMR_SM_UART | prev_mode);
606 } else {
607 out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
608 }
609
610 if (pinfo->clk)
611 clk_set_rate(pinfo->clk, baud);
612 else
613 cpm_set_brg(pinfo->brg - 1, baud);
614 spin_unlock_irqrestore(&port->lock, flags);
615 }
616
617 static const char *cpm_uart_type(struct uart_port *port)
618 {
619 pr_debug("CPM uart[%d]:uart_type\n", port->line);
620
621 return port->type == PORT_CPM ? "CPM UART" : NULL;
622 }
623
624 /*
625 * verify the new serial_struct (for TIOCSSERIAL).
626 */
627 static int cpm_uart_verify_port(struct uart_port *port,
628 struct serial_struct *ser)
629 {
630 int ret = 0;
631
632 pr_debug("CPM uart[%d]:verify_port\n", port->line);
633
634 if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
635 ret = -EINVAL;
636 if (ser->irq < 0 || ser->irq >= nr_irqs)
637 ret = -EINVAL;
638 if (ser->baud_base < 9600)
639 ret = -EINVAL;
640 return ret;
641 }
642
643 /*
644 * Transmit characters, refill buffer descriptor, if possible
645 */
646 static int cpm_uart_tx_pump(struct uart_port *port)
647 {
648 cbd_t __iomem *bdp;
649 u8 *p;
650 int count;
651 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
652 struct circ_buf *xmit = &port->state->xmit;
653
654 /* Handle xon/xoff */
655 if (port->x_char) {
656 /* Pick next descriptor and fill from buffer */
657 bdp = pinfo->tx_cur;
658
659 p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
660
661 *p++ = port->x_char;
662
663 out_be16(&bdp->cbd_datlen, 1);
664 setbits16(&bdp->cbd_sc, BD_SC_READY);
665 /* Get next BD. */
666 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
667 bdp = pinfo->tx_bd_base;
668 else
669 bdp++;
670 pinfo->tx_cur = bdp;
671
672 port->icount.tx++;
673 port->x_char = 0;
674 return 1;
675 }
676
677 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
678 cpm_uart_stop_tx(port);
679 return 0;
680 }
681
682 /* Pick next descriptor and fill from buffer */
683 bdp = pinfo->tx_cur;
684
685 while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) &&
686 xmit->tail != xmit->head) {
687 count = 0;
688 p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
689 while (count < pinfo->tx_fifosize) {
690 *p++ = xmit->buf[xmit->tail];
691 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
692 port->icount.tx++;
693 count++;
694 if (xmit->head == xmit->tail)
695 break;
696 }
697 out_be16(&bdp->cbd_datlen, count);
698 setbits16(&bdp->cbd_sc, BD_SC_READY);
699 /* Get next BD. */
700 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
701 bdp = pinfo->tx_bd_base;
702 else
703 bdp++;
704 }
705 pinfo->tx_cur = bdp;
706
707 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
708 uart_write_wakeup(port);
709
710 if (uart_circ_empty(xmit)) {
711 cpm_uart_stop_tx(port);
712 return 0;
713 }
714
715 return 1;
716 }
717
718 /*
719 * init buffer descriptors
720 */
721 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
722 {
723 int i;
724 u8 *mem_addr;
725 cbd_t __iomem *bdp;
726
727 pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
728
729 /* Set the physical address of the host memory
730 * buffers in the buffer descriptors, and the
731 * virtual address for us to work with.
732 */
733 mem_addr = pinfo->mem_addr;
734 bdp = pinfo->rx_cur = pinfo->rx_bd_base;
735 for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
736 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
737 out_be16(&bdp->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
738 mem_addr += pinfo->rx_fifosize;
739 }
740
741 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
742 out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
743
744 /* Set the physical address of the host memory
745 * buffers in the buffer descriptors, and the
746 * virtual address for us to work with.
747 */
748 mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
749 bdp = pinfo->tx_cur = pinfo->tx_bd_base;
750 for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
751 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
752 out_be16(&bdp->cbd_sc, BD_SC_INTRPT);
753 mem_addr += pinfo->tx_fifosize;
754 }
755
756 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
757 out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_INTRPT);
758 }
759
760 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
761 {
762 scc_t __iomem *scp;
763 scc_uart_t __iomem *sup;
764
765 pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
766
767 scp = pinfo->sccp;
768 sup = pinfo->sccup;
769
770 /* Store address */
771 out_be16(&pinfo->sccup->scc_genscc.scc_rbase,
772 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
773 out_be16(&pinfo->sccup->scc_genscc.scc_tbase,
774 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
775
776 /* Set up the uart parameters in the
777 * parameter ram.
778 */
779
780 cpm_set_scc_fcr(sup);
781
782 out_be16(&sup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
783 out_be16(&sup->scc_maxidl, pinfo->rx_fifosize);
784 out_be16(&sup->scc_brkcr, 1);
785 out_be16(&sup->scc_parec, 0);
786 out_be16(&sup->scc_frmec, 0);
787 out_be16(&sup->scc_nosec, 0);
788 out_be16(&sup->scc_brkec, 0);
789 out_be16(&sup->scc_uaddr1, 0);
790 out_be16(&sup->scc_uaddr2, 0);
791 out_be16(&sup->scc_toseq, 0);
792 out_be16(&sup->scc_char1, 0x8000);
793 out_be16(&sup->scc_char2, 0x8000);
794 out_be16(&sup->scc_char3, 0x8000);
795 out_be16(&sup->scc_char4, 0x8000);
796 out_be16(&sup->scc_char5, 0x8000);
797 out_be16(&sup->scc_char6, 0x8000);
798 out_be16(&sup->scc_char7, 0x8000);
799 out_be16(&sup->scc_char8, 0x8000);
800 out_be16(&sup->scc_rccm, 0xc0ff);
801
802 /* Send the CPM an initialize command.
803 */
804 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
805
806 /* Set UART mode, 8 bit, no parity, one stop.
807 * Enable receive and transmit.
808 */
809 out_be32(&scp->scc_gsmrh, 0);
810 out_be32(&scp->scc_gsmrl,
811 SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
812
813 /* Enable rx interrupts and clear all pending events. */
814 out_be16(&scp->scc_sccm, 0);
815 out_be16(&scp->scc_scce, 0xffff);
816 out_be16(&scp->scc_dsr, 0x7e7e);
817 out_be16(&scp->scc_psmr, 0x3000);
818
819 setbits32(&scp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
820 }
821
822 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
823 {
824 smc_t __iomem *sp;
825 smc_uart_t __iomem *up;
826
827 pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
828
829 sp = pinfo->smcp;
830 up = pinfo->smcup;
831
832 /* Store address */
833 out_be16(&pinfo->smcup->smc_rbase,
834 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
835 out_be16(&pinfo->smcup->smc_tbase,
836 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
837
838 /*
839 * In case SMC1 is being relocated...
840 */
841 #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
842 out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase));
843 out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase));
844 out_be32(&up->smc_rstate, 0);
845 out_be32(&up->smc_tstate, 0);
846 out_be16(&up->smc_brkcr, 1); /* number of break chars */
847 out_be16(&up->smc_brkec, 0);
848 #endif
849
850 /* Set up the uart parameters in the
851 * parameter ram.
852 */
853 cpm_set_smc_fcr(up);
854
855 /* Using idle charater time requires some additional tuning. */
856 out_be16(&up->smc_mrblr, pinfo->rx_fifosize);
857 out_be16(&up->smc_maxidl, pinfo->rx_fifosize);
858 out_be16(&up->smc_brklen, 0);
859 out_be16(&up->smc_brkec, 0);
860 out_be16(&up->smc_brkcr, 1);
861
862 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
863
864 /* Set UART mode, 8 bit, no parity, one stop.
865 * Enable receive and transmit.
866 */
867 out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
868
869 /* Enable only rx interrupts clear all pending events. */
870 out_8(&sp->smc_smcm, 0);
871 out_8(&sp->smc_smce, 0xff);
872
873 setbits16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
874 }
875
876 /*
877 * Initialize port. This is called from early_console stuff
878 * so we have to be careful here !
879 */
880 static int cpm_uart_request_port(struct uart_port *port)
881 {
882 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
883 int ret;
884
885 pr_debug("CPM uart[%d]:request port\n", port->line);
886
887 if (pinfo->flags & FLAG_CONSOLE)
888 return 0;
889
890 if (IS_SMC(pinfo)) {
891 clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
892 clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
893 } else {
894 clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
895 clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
896 }
897
898 ret = cpm_uart_allocbuf(pinfo, 0);
899
900 if (ret)
901 return ret;
902
903 cpm_uart_initbd(pinfo);
904 if (IS_SMC(pinfo))
905 cpm_uart_init_smc(pinfo);
906 else
907 cpm_uart_init_scc(pinfo);
908
909 return 0;
910 }
911
912 static void cpm_uart_release_port(struct uart_port *port)
913 {
914 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
915
916 if (!(pinfo->flags & FLAG_CONSOLE))
917 cpm_uart_freebuf(pinfo);
918 }
919
920 /*
921 * Configure/autoconfigure the port.
922 */
923 static void cpm_uart_config_port(struct uart_port *port, int flags)
924 {
925 pr_debug("CPM uart[%d]:config_port\n", port->line);
926
927 if (flags & UART_CONFIG_TYPE) {
928 port->type = PORT_CPM;
929 cpm_uart_request_port(port);
930 }
931 }
932
933 #ifdef CONFIG_CONSOLE_POLL
934 /* Serial polling routines for writing and reading from the uart while
935 * in an interrupt or debug context.
936 */
937
938 #define GDB_BUF_SIZE 512 /* power of 2, please */
939
940 static char poll_buf[GDB_BUF_SIZE];
941 static char *pollp;
942 static int poll_chars;
943
944 static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
945 {
946 u_char c, *cp;
947 volatile cbd_t *bdp;
948 int i;
949
950 /* Get the address of the host memory buffer.
951 */
952 bdp = pinfo->rx_cur;
953 while (bdp->cbd_sc & BD_SC_EMPTY)
954 ;
955
956 /* If the buffer address is in the CPM DPRAM, don't
957 * convert it.
958 */
959 cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
960
961 if (obuf) {
962 i = c = bdp->cbd_datlen;
963 while (i-- > 0)
964 *obuf++ = *cp++;
965 } else
966 c = *cp;
967 bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
968 bdp->cbd_sc |= BD_SC_EMPTY;
969
970 if (bdp->cbd_sc & BD_SC_WRAP)
971 bdp = pinfo->rx_bd_base;
972 else
973 bdp++;
974 pinfo->rx_cur = (cbd_t *)bdp;
975
976 return (int)c;
977 }
978
979 static int cpm_get_poll_char(struct uart_port *port)
980 {
981 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
982
983 if (!serial_polled) {
984 serial_polled = 1;
985 poll_chars = 0;
986 }
987 if (poll_chars <= 0) {
988 poll_chars = poll_wait_key(poll_buf, pinfo);
989 pollp = poll_buf;
990 }
991 poll_chars--;
992 return *pollp++;
993 }
994
995 static void cpm_put_poll_char(struct uart_port *port,
996 unsigned char c)
997 {
998 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
999 static char ch[2];
1000
1001 ch[0] = (char)c;
1002 cpm_uart_early_write(pinfo->port.line, ch, 1);
1003 }
1004 #endif /* CONFIG_CONSOLE_POLL */
1005
1006 static struct uart_ops cpm_uart_pops = {
1007 .tx_empty = cpm_uart_tx_empty,
1008 .set_mctrl = cpm_uart_set_mctrl,
1009 .get_mctrl = cpm_uart_get_mctrl,
1010 .stop_tx = cpm_uart_stop_tx,
1011 .start_tx = cpm_uart_start_tx,
1012 .stop_rx = cpm_uart_stop_rx,
1013 .enable_ms = cpm_uart_enable_ms,
1014 .break_ctl = cpm_uart_break_ctl,
1015 .startup = cpm_uart_startup,
1016 .shutdown = cpm_uart_shutdown,
1017 .set_termios = cpm_uart_set_termios,
1018 .type = cpm_uart_type,
1019 .release_port = cpm_uart_release_port,
1020 .request_port = cpm_uart_request_port,
1021 .config_port = cpm_uart_config_port,
1022 .verify_port = cpm_uart_verify_port,
1023 #ifdef CONFIG_CONSOLE_POLL
1024 .poll_get_char = cpm_get_poll_char,
1025 .poll_put_char = cpm_put_poll_char,
1026 #endif
1027 };
1028
1029 struct uart_cpm_port cpm_uart_ports[UART_NR];
1030
1031 static int cpm_uart_init_port(struct device_node *np,
1032 struct uart_cpm_port *pinfo)
1033 {
1034 const u32 *data;
1035 void __iomem *mem, *pram;
1036 int len;
1037 int ret;
1038 int i;
1039
1040 data = of_get_property(np, "clock", NULL);
1041 if (data) {
1042 struct clk *clk = clk_get(NULL, (const char*)data);
1043 if (!IS_ERR(clk))
1044 pinfo->clk = clk;
1045 }
1046 if (!pinfo->clk) {
1047 data = of_get_property(np, "fsl,cpm-brg", &len);
1048 if (!data || len != 4) {
1049 printk(KERN_ERR "CPM UART %s has no/invalid "
1050 "fsl,cpm-brg property.\n", np->name);
1051 return -EINVAL;
1052 }
1053 pinfo->brg = *data;
1054 }
1055
1056 data = of_get_property(np, "fsl,cpm-command", &len);
1057 if (!data || len != 4) {
1058 printk(KERN_ERR "CPM UART %s has no/invalid "
1059 "fsl,cpm-command property.\n", np->name);
1060 return -EINVAL;
1061 }
1062 pinfo->command = *data;
1063
1064 mem = of_iomap(np, 0);
1065 if (!mem)
1066 return -ENOMEM;
1067
1068 if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") ||
1069 of_device_is_compatible(np, "fsl,cpm2-scc-uart")) {
1070 pinfo->sccp = mem;
1071 pinfo->sccup = pram = cpm_uart_map_pram(pinfo, np);
1072 } else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") ||
1073 of_device_is_compatible(np, "fsl,cpm2-smc-uart")) {
1074 pinfo->flags |= FLAG_SMC;
1075 pinfo->smcp = mem;
1076 pinfo->smcup = pram = cpm_uart_map_pram(pinfo, np);
1077 } else {
1078 ret = -ENODEV;
1079 goto out_mem;
1080 }
1081
1082 if (!pram) {
1083 ret = -ENOMEM;
1084 goto out_mem;
1085 }
1086
1087 pinfo->tx_nrfifos = TX_NUM_FIFO;
1088 pinfo->tx_fifosize = TX_BUF_SIZE;
1089 pinfo->rx_nrfifos = RX_NUM_FIFO;
1090 pinfo->rx_fifosize = RX_BUF_SIZE;
1091
1092 pinfo->port.uartclk = ppc_proc_freq;
1093 pinfo->port.mapbase = (unsigned long)mem;
1094 pinfo->port.type = PORT_CPM;
1095 pinfo->port.ops = &cpm_uart_pops,
1096 pinfo->port.iotype = UPIO_MEM;
1097 pinfo->port.fifosize = pinfo->tx_nrfifos * pinfo->tx_fifosize;
1098 spin_lock_init(&pinfo->port.lock);
1099
1100 pinfo->port.irq = of_irq_to_resource(np, 0, NULL);
1101 if (pinfo->port.irq == NO_IRQ) {
1102 ret = -EINVAL;
1103 goto out_pram;
1104 }
1105
1106 for (i = 0; i < NUM_GPIOS; i++)
1107 pinfo->gpios[i] = of_get_gpio(np, i);
1108
1109 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
1110 udbg_putc = NULL;
1111 #endif
1112
1113 return cpm_uart_request_port(&pinfo->port);
1114
1115 out_pram:
1116 cpm_uart_unmap_pram(pinfo, pram);
1117 out_mem:
1118 iounmap(mem);
1119 return ret;
1120 }
1121
1122 #ifdef CONFIG_SERIAL_CPM_CONSOLE
1123 /*
1124 * Print a string to the serial port trying not to disturb
1125 * any possible real use of the port...
1126 *
1127 * Note that this is called with interrupts already disabled
1128 */
1129 static void cpm_uart_console_write(struct console *co, const char *s,
1130 u_int count)
1131 {
1132 struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
1133 unsigned int i;
1134 cbd_t __iomem *bdp, *bdbase;
1135 unsigned char *cp;
1136 unsigned long flags;
1137 int nolock = oops_in_progress;
1138
1139 if (unlikely(nolock)) {
1140 local_irq_save(flags);
1141 } else {
1142 spin_lock_irqsave(&pinfo->port.lock, flags);
1143 }
1144
1145 /* Get the address of the host memory buffer.
1146 */
1147 bdp = pinfo->tx_cur;
1148 bdbase = pinfo->tx_bd_base;
1149
1150 /*
1151 * Now, do each character. This is not as bad as it looks
1152 * since this is a holding FIFO and not a transmitting FIFO.
1153 * We could add the complexity of filling the entire transmit
1154 * buffer, but we would just wait longer between accesses......
1155 */
1156 for (i = 0; i < count; i++, s++) {
1157 /* Wait for transmitter fifo to empty.
1158 * Ready indicates output is ready, and xmt is doing
1159 * that, not that it is ready for us to send.
1160 */
1161 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1162 ;
1163
1164 /* Send the character out.
1165 * If the buffer address is in the CPM DPRAM, don't
1166 * convert it.
1167 */
1168 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
1169 *cp = *s;
1170
1171 out_be16(&bdp->cbd_datlen, 1);
1172 setbits16(&bdp->cbd_sc, BD_SC_READY);
1173
1174 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
1175 bdp = bdbase;
1176 else
1177 bdp++;
1178
1179 /* if a LF, also do CR... */
1180 if (*s == 10) {
1181 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1182 ;
1183
1184 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
1185 *cp = 13;
1186
1187 out_be16(&bdp->cbd_datlen, 1);
1188 setbits16(&bdp->cbd_sc, BD_SC_READY);
1189
1190 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
1191 bdp = bdbase;
1192 else
1193 bdp++;
1194 }
1195 }
1196
1197 /*
1198 * Finally, Wait for transmitter & holding register to empty
1199 * and restore the IER
1200 */
1201 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1202 ;
1203
1204 pinfo->tx_cur = bdp;
1205
1206 if (unlikely(nolock)) {
1207 local_irq_restore(flags);
1208 } else {
1209 spin_unlock_irqrestore(&pinfo->port.lock, flags);
1210 }
1211 }
1212
1213
1214 static int __init cpm_uart_console_setup(struct console *co, char *options)
1215 {
1216 int baud = 38400;
1217 int bits = 8;
1218 int parity = 'n';
1219 int flow = 'n';
1220 int ret;
1221 struct uart_cpm_port *pinfo;
1222 struct uart_port *port;
1223
1224 struct device_node *np = NULL;
1225 int i = 0;
1226
1227 if (co->index >= UART_NR) {
1228 printk(KERN_ERR "cpm_uart: console index %d too high\n",
1229 co->index);
1230 return -ENODEV;
1231 }
1232
1233 do {
1234 np = of_find_node_by_type(np, "serial");
1235 if (!np)
1236 return -ENODEV;
1237
1238 if (!of_device_is_compatible(np, "fsl,cpm1-smc-uart") &&
1239 !of_device_is_compatible(np, "fsl,cpm1-scc-uart") &&
1240 !of_device_is_compatible(np, "fsl,cpm2-smc-uart") &&
1241 !of_device_is_compatible(np, "fsl,cpm2-scc-uart"))
1242 i--;
1243 } while (i++ != co->index);
1244
1245 pinfo = &cpm_uart_ports[co->index];
1246
1247 pinfo->flags |= FLAG_CONSOLE;
1248 port = &pinfo->port;
1249
1250 ret = cpm_uart_init_port(np, pinfo);
1251 of_node_put(np);
1252 if (ret)
1253 return ret;
1254
1255 if (options) {
1256 uart_parse_options(options, &baud, &parity, &bits, &flow);
1257 } else {
1258 if ((baud = uart_baudrate()) == -1)
1259 baud = 9600;
1260 }
1261
1262 if (IS_SMC(pinfo)) {
1263 out_be16(&pinfo->smcup->smc_brkcr, 0);
1264 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
1265 clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
1266 clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
1267 } else {
1268 out_be16(&pinfo->sccup->scc_brkcr, 0);
1269 cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
1270 clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
1271 clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1272 }
1273
1274 ret = cpm_uart_allocbuf(pinfo, 1);
1275
1276 if (ret)
1277 return ret;
1278
1279 cpm_uart_initbd(pinfo);
1280
1281 if (IS_SMC(pinfo))
1282 cpm_uart_init_smc(pinfo);
1283 else
1284 cpm_uart_init_scc(pinfo);
1285
1286 uart_set_options(port, co, baud, parity, bits, flow);
1287 cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
1288
1289 return 0;
1290 }
1291
1292 static struct uart_driver cpm_reg;
1293 static struct console cpm_scc_uart_console = {
1294 .name = "ttyCPM",
1295 .write = cpm_uart_console_write,
1296 .device = uart_console_device,
1297 .setup = cpm_uart_console_setup,
1298 .flags = CON_PRINTBUFFER,
1299 .index = -1,
1300 .data = &cpm_reg,
1301 };
1302
1303 static int __init cpm_uart_console_init(void)
1304 {
1305 register_console(&cpm_scc_uart_console);
1306 return 0;
1307 }
1308
1309 console_initcall(cpm_uart_console_init);
1310
1311 #define CPM_UART_CONSOLE &cpm_scc_uart_console
1312 #else
1313 #define CPM_UART_CONSOLE NULL
1314 #endif
1315
1316 static struct uart_driver cpm_reg = {
1317 .owner = THIS_MODULE,
1318 .driver_name = "ttyCPM",
1319 .dev_name = "ttyCPM",
1320 .major = SERIAL_CPM_MAJOR,
1321 .minor = SERIAL_CPM_MINOR,
1322 .cons = CPM_UART_CONSOLE,
1323 .nr = UART_NR,
1324 };
1325
1326 static int probe_index;
1327
1328 static int __devinit cpm_uart_probe(struct of_device *ofdev,
1329 const struct of_device_id *match)
1330 {
1331 int index = probe_index++;
1332 struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
1333 int ret;
1334
1335 pinfo->port.line = index;
1336
1337 if (index >= UART_NR)
1338 return -ENODEV;
1339
1340 dev_set_drvdata(&ofdev->dev, pinfo);
1341
1342 /* initialize the device pointer for the port */
1343 pinfo->port.dev = &ofdev->dev;
1344
1345 ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
1346 if (ret)
1347 return ret;
1348
1349 return uart_add_one_port(&cpm_reg, &pinfo->port);
1350 }
1351
1352 static int __devexit cpm_uart_remove(struct of_device *ofdev)
1353 {
1354 struct uart_cpm_port *pinfo = dev_get_drvdata(&ofdev->dev);
1355 return uart_remove_one_port(&cpm_reg, &pinfo->port);
1356 }
1357
1358 static struct of_device_id cpm_uart_match[] = {
1359 {
1360 .compatible = "fsl,cpm1-smc-uart",
1361 },
1362 {
1363 .compatible = "fsl,cpm1-scc-uart",
1364 },
1365 {
1366 .compatible = "fsl,cpm2-smc-uart",
1367 },
1368 {
1369 .compatible = "fsl,cpm2-scc-uart",
1370 },
1371 {}
1372 };
1373
1374 static struct of_platform_driver cpm_uart_driver = {
1375 .driver = {
1376 .name = "cpm_uart",
1377 .owner = THIS_MODULE,
1378 .of_match_table = cpm_uart_match,
1379 },
1380 .probe = cpm_uart_probe,
1381 .remove = cpm_uart_remove,
1382 };
1383
1384 static int __init cpm_uart_init(void)
1385 {
1386 int ret = uart_register_driver(&cpm_reg);
1387 if (ret)
1388 return ret;
1389
1390 ret = of_register_platform_driver(&cpm_uart_driver);
1391 if (ret)
1392 uart_unregister_driver(&cpm_reg);
1393
1394 return ret;
1395 }
1396
1397 static void __exit cpm_uart_exit(void)
1398 {
1399 of_unregister_platform_driver(&cpm_uart_driver);
1400 uart_unregister_driver(&cpm_reg);
1401 }
1402
1403 module_init(cpm_uart_init);
1404 module_exit(cpm_uart_exit);
1405
1406 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1407 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1408 MODULE_LICENSE("GPL");
1409 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree