?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
revert-mm-fix-blkdev-size-calculation-in-generic_write_checks
[linux-2.6/linux-trees-mm.git] / drivers / serial / cpm_uart / cpm_uart_core.c
blob236af9d3385123897985a84ff215cf395b3a2ff0
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
46 #include <asm/io.h>
47 #include <asm/irq.h>
48 #include <asm/delay.h>
49 #include <asm/fs_pd.h>
50 #include <asm/udbg.h>
51
52 #ifdef CONFIG_PPC_CPM_NEW_BINDING
53 #include <linux/of_platform.h>
54 #endif
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 #ifndef CONFIG_PPC_CPM_NEW_BINDING
76 /* Track which ports are configured as uarts */
77 int cpm_uart_port_map[UART_NR];
78 /* How many ports did we config as uarts */
79 int cpm_uart_nr;
80
81 /* Place-holder for board-specific stuff */
82 struct platform_device* __attribute__ ((weak)) __init
83 early_uart_get_pdev(int index)
84 {
85 return NULL;
86 }
87
88
89 static void cpm_uart_count(void)
90 {
91 cpm_uart_nr = 0;
92 #ifdef CONFIG_SERIAL_CPM_SMC1
93 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
94 #endif
95 #ifdef CONFIG_SERIAL_CPM_SMC2
96 cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
97 #endif
98 #ifdef CONFIG_SERIAL_CPM_SCC1
99 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
100 #endif
101 #ifdef CONFIG_SERIAL_CPM_SCC2
102 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
103 #endif
104 #ifdef CONFIG_SERIAL_CPM_SCC3
105 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
106 #endif
107 #ifdef CONFIG_SERIAL_CPM_SCC4
108 cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
109 #endif
110 }
111
112 /* Get UART number by its id */
113 static int cpm_uart_id2nr(int id)
114 {
115 int i;
116 if (id < UART_NR) {
117 for (i=0; i<UART_NR; i++) {
118 if (cpm_uart_port_map[i] == id)
119 return i;
120 }
121 }
122
123 /* not found or invalid argument */
124 return -1;
125 }
126 #endif
127
128 /*
129 * Check, if transmit buffers are processed
130 */
131 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
132 {
133 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
134 cbd_t __iomem *bdp = pinfo->tx_bd_base;
135 int ret = 0;
136
137 while (1) {
138 if (in_be16(&bdp->cbd_sc) & BD_SC_READY)
139 break;
140
141 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP) {
142 ret = TIOCSER_TEMT;
143 break;
144 }
145 bdp++;
146 }
147
148 pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
149
150 return ret;
151 }
152
153 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
154 {
155 /* Whee. Do nothing. */
156 }
157
158 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
159 {
160 /* Whee. Do nothing. */
161 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
162 }
163
164 /*
165 * Stop transmitter
166 */
167 static void cpm_uart_stop_tx(struct uart_port *port)
168 {
169 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
170 smc_t __iomem *smcp = pinfo->smcp;
171 scc_t __iomem *sccp = pinfo->sccp;
172
173 pr_debug("CPM uart[%d]:stop tx\n", port->line);
174
175 if (IS_SMC(pinfo))
176 clrbits8(&smcp->smc_smcm, SMCM_TX);
177 else
178 clrbits16(&sccp->scc_sccm, UART_SCCM_TX);
179 }
180
181 /*
182 * Start transmitter
183 */
184 static void cpm_uart_start_tx(struct uart_port *port)
185 {
186 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
187 smc_t __iomem *smcp = pinfo->smcp;
188 scc_t __iomem *sccp = pinfo->sccp;
189
190 pr_debug("CPM uart[%d]:start tx\n", port->line);
191
192 if (IS_SMC(pinfo)) {
193 if (in_8(&smcp->smc_smcm) & SMCM_TX)
194 return;
195 } else {
196 if (in_be16(&sccp->scc_sccm) & UART_SCCM_TX)
197 return;
198 }
199
200 if (cpm_uart_tx_pump(port) != 0) {
201 if (IS_SMC(pinfo)) {
202 setbits8(&smcp->smc_smcm, SMCM_TX);
203 } else {
204 setbits16(&sccp->scc_sccm, UART_SCCM_TX);
205 }
206 }
207 }
208
209 /*
210 * Stop receiver
211 */
212 static void cpm_uart_stop_rx(struct uart_port *port)
213 {
214 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
215 smc_t __iomem *smcp = pinfo->smcp;
216 scc_t __iomem *sccp = pinfo->sccp;
217
218 pr_debug("CPM uart[%d]:stop rx\n", port->line);
219
220 if (IS_SMC(pinfo))
221 clrbits8(&smcp->smc_smcm, SMCM_RX);
222 else
223 clrbits16(&sccp->scc_sccm, UART_SCCM_RX);
224 }
225
226 /*
227 * Enable Modem status interrupts
228 */
229 static void cpm_uart_enable_ms(struct uart_port *port)
230 {
231 pr_debug("CPM uart[%d]:enable ms\n", port->line);
232 }
233
234 /*
235 * Generate a break.
236 */
237 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
238 {
239 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
240
241 pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
242 break_state);
243
244 if (break_state)
245 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
246 else
247 cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
248 }
249
250 /*
251 * Transmit characters, refill buffer descriptor, if possible
252 */
253 static void cpm_uart_int_tx(struct uart_port *port)
254 {
255 pr_debug("CPM uart[%d]:TX INT\n", port->line);
256
257 cpm_uart_tx_pump(port);
258 }
259
260 /*
261 * Receive characters
262 */
263 static void cpm_uart_int_rx(struct uart_port *port)
264 {
265 int i;
266 unsigned char ch;
267 u8 *cp;
268 struct tty_struct *tty = port->info->tty;
269 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
270 cbd_t __iomem *bdp;
271 u16 status;
272 unsigned int flg;
273
274 pr_debug("CPM uart[%d]:RX INT\n", port->line);
275
276 /* Just loop through the closed BDs and copy the characters into
277 * the buffer.
278 */
279 bdp = pinfo->rx_cur;
280 for (;;) {
281 /* get status */
282 status = in_be16(&bdp->cbd_sc);
283 /* If this one is empty, return happy */
284 if (status & BD_SC_EMPTY)
285 break;
286
287 /* get number of characters, and check spce in flip-buffer */
288 i = in_be16(&bdp->cbd_datlen);
289
290 /* If we have not enough room in tty flip buffer, then we try
291 * later, which will be the next rx-interrupt or a timeout
292 */
293 if(tty_buffer_request_room(tty, i) < i) {
294 printk(KERN_WARNING "No room in flip buffer\n");
295 return;
296 }
297
298 /* get pointer */
299 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
300
301 /* loop through the buffer */
302 while (i-- > 0) {
303 ch = *cp++;
304 port->icount.rx++;
305 flg = TTY_NORMAL;
306
307 if (status &
308 (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
309 goto handle_error;
310 if (uart_handle_sysrq_char(port, ch))
311 continue;
312
313 error_return:
314 tty_insert_flip_char(tty, ch, flg);
315
316 } /* End while (i--) */
317
318 /* This BD is ready to be used again. Clear status. get next */
319 clrbits16(&bdp->cbd_sc, BD_SC_BR | BD_SC_FR | BD_SC_PR |
320 BD_SC_OV | BD_SC_ID);
321 setbits16(&bdp->cbd_sc, BD_SC_EMPTY);
322
323 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
324 bdp = pinfo->rx_bd_base;
325 else
326 bdp++;
327
328 } /* End for (;;) */
329
330 /* Write back buffer pointer */
331 pinfo->rx_cur = bdp;
332
333 /* activate BH processing */
334 tty_flip_buffer_push(tty);
335
336 return;
337
338 /* Error processing */
339
340 handle_error:
341 /* Statistics */
342 if (status & BD_SC_BR)
343 port->icount.brk++;
344 if (status & BD_SC_PR)
345 port->icount.parity++;
346 if (status & BD_SC_FR)
347 port->icount.frame++;
348 if (status & BD_SC_OV)
349 port->icount.overrun++;
350
351 /* Mask out ignored conditions */
352 status &= port->read_status_mask;
353
354 /* Handle the remaining ones */
355 if (status & BD_SC_BR)
356 flg = TTY_BREAK;
357 else if (status & BD_SC_PR)
358 flg = TTY_PARITY;
359 else if (status & BD_SC_FR)
360 flg = TTY_FRAME;
361
362 /* overrun does not affect the current character ! */
363 if (status & BD_SC_OV) {
364 ch = 0;
365 flg = TTY_OVERRUN;
366 /* We skip this buffer */
367 /* CHECK: Is really nothing senseful there */
368 /* ASSUMPTION: it contains nothing valid */
369 i = 0;
370 }
371 #ifdef SUPPORT_SYSRQ
372 port->sysrq = 0;
373 #endif
374 goto error_return;
375 }
376
377 /*
378 * Asynchron mode interrupt handler
379 */
380 static irqreturn_t cpm_uart_int(int irq, void *data)
381 {
382 u8 events;
383 struct uart_port *port = data;
384 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
385 smc_t __iomem *smcp = pinfo->smcp;
386 scc_t __iomem *sccp = pinfo->sccp;
387
388 pr_debug("CPM uart[%d]:IRQ\n", port->line);
389
390 if (IS_SMC(pinfo)) {
391 events = in_8(&smcp->smc_smce);
392 out_8(&smcp->smc_smce, events);
393 if (events & SMCM_BRKE)
394 uart_handle_break(port);
395 if (events & SMCM_RX)
396 cpm_uart_int_rx(port);
397 if (events & SMCM_TX)
398 cpm_uart_int_tx(port);
399 } else {
400 events = in_be16(&sccp->scc_scce);
401 out_be16(&sccp->scc_scce, events);
402 if (events & UART_SCCM_BRKE)
403 uart_handle_break(port);
404 if (events & UART_SCCM_RX)
405 cpm_uart_int_rx(port);
406 if (events & UART_SCCM_TX)
407 cpm_uart_int_tx(port);
408 }
409 return (events) ? IRQ_HANDLED : IRQ_NONE;
410 }
411
412 static int cpm_uart_startup(struct uart_port *port)
413 {
414 int retval;
415 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
416
417 pr_debug("CPM uart[%d]:startup\n", port->line);
418
419 /* Install interrupt handler. */
420 retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
421 if (retval)
422 return retval;
423
424 /* Startup rx-int */
425 if (IS_SMC(pinfo)) {
426 setbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
427 setbits16(&pinfo->smcp->smc_smcmr, (SMCMR_REN | SMCMR_TEN));
428 } else {
429 setbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
430 setbits32(&pinfo->sccp->scc_gsmrl, (SCC_GSMRL_ENR | SCC_GSMRL_ENT));
431 }
432
433 if (!(pinfo->flags & FLAG_CONSOLE))
434 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
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 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
481 else
482 cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
483
484 cpm_uart_initbd(pinfo);
485 }
486 }
487
488 static void cpm_uart_set_termios(struct uart_port *port,
489 struct ktermios *termios,
490 struct ktermios *old)
491 {
492 int baud;
493 unsigned long flags;
494 u16 cval, scval, prev_mode;
495 int bits, sbits;
496 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
497 smc_t __iomem *smcp = pinfo->smcp;
498 scc_t __iomem *sccp = pinfo->sccp;
499
500 pr_debug("CPM uart[%d]:set_termios\n", port->line);
501
502 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
503
504 /* Character length programmed into the mode register is the
505 * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
506 * 1 or 2 stop bits, minus 1.
507 * The value 'bits' counts this for us.
508 */
509 cval = 0;
510 scval = 0;
511
512 /* byte size */
513 switch (termios->c_cflag & CSIZE) {
514 case CS5:
515 bits = 5;
516 break;
517 case CS6:
518 bits = 6;
519 break;
520 case CS7:
521 bits = 7;
522 break;
523 case CS8:
524 bits = 8;
525 break;
526 /* Never happens, but GCC is too dumb to figure it out */
527 default:
528 bits = 8;
529 break;
530 }
531 sbits = bits - 5;
532
533 if (termios->c_cflag & CSTOPB) {
534 cval |= SMCMR_SL; /* Two stops */
535 scval |= SCU_PSMR_SL;
536 bits++;
537 }
538
539 if (termios->c_cflag & PARENB) {
540 cval |= SMCMR_PEN;
541 scval |= SCU_PSMR_PEN;
542 bits++;
543 if (!(termios->c_cflag & PARODD)) {
544 cval |= SMCMR_PM_EVEN;
545 scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
546 }
547 }
548
549 /*
550 * Set up parity check flag
551 */
552 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
553
554 port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
555 if (termios->c_iflag & INPCK)
556 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
557 if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
558 port->read_status_mask |= BD_SC_BR;
559
560 /*
561 * Characters to ignore
562 */
563 port->ignore_status_mask = 0;
564 if (termios->c_iflag & IGNPAR)
565 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
566 if (termios->c_iflag & IGNBRK) {
567 port->ignore_status_mask |= BD_SC_BR;
568 /*
569 * If we're ignore parity and break indicators, ignore
570 * overruns too. (For real raw support).
571 */
572 if (termios->c_iflag & IGNPAR)
573 port->ignore_status_mask |= BD_SC_OV;
574 }
575 /*
576 * !!! ignore all characters if CREAD is not set
577 */
578 if ((termios->c_cflag & CREAD) == 0)
579 port->read_status_mask &= ~BD_SC_EMPTY;
580
581 spin_lock_irqsave(&port->lock, flags);
582
583 /* Start bit has not been added (so don't, because we would just
584 * subtract it later), and we need to add one for the number of
585 * stops bits (there is always at least one).
586 */
587 bits++;
588 if (IS_SMC(pinfo)) {
589 /* Set the mode register. We want to keep a copy of the
590 * enables, because we want to put them back if they were
591 * present.
592 */
593 prev_mode = in_be16(&smcp->smc_smcmr);
594 out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval | SMCMR_SM_UART);
595 setbits16(&smcp->smc_smcmr, (prev_mode & (SMCMR_REN | SMCMR_TEN)));
596 } else {
597 out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
598 }
599
600 cpm_set_brg(pinfo->brg - 1, baud);
601 spin_unlock_irqrestore(&port->lock, flags);
602 }
603
604 static const char *cpm_uart_type(struct uart_port *port)
605 {
606 pr_debug("CPM uart[%d]:uart_type\n", port->line);
607
608 return port->type == PORT_CPM ? "CPM UART" : NULL;
609 }
610
611 /*
612 * verify the new serial_struct (for TIOCSSERIAL).
613 */
614 static int cpm_uart_verify_port(struct uart_port *port,
615 struct serial_struct *ser)
616 {
617 int ret = 0;
618
619 pr_debug("CPM uart[%d]:verify_port\n", port->line);
620
621 if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
622 ret = -EINVAL;
623 if (ser->irq < 0 || ser->irq >= NR_IRQS)
624 ret = -EINVAL;
625 if (ser->baud_base < 9600)
626 ret = -EINVAL;
627 return ret;
628 }
629
630 /*
631 * Transmit characters, refill buffer descriptor, if possible
632 */
633 static int cpm_uart_tx_pump(struct uart_port *port)
634 {
635 cbd_t __iomem *bdp;
636 u8 *p;
637 int count;
638 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
639 struct circ_buf *xmit = &port->info->xmit;
640
641 /* Handle xon/xoff */
642 if (port->x_char) {
643 /* Pick next descriptor and fill from buffer */
644 bdp = pinfo->tx_cur;
645
646 p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
647
648 *p++ = port->x_char;
649
650 out_be16(&bdp->cbd_datlen, 1);
651 setbits16(&bdp->cbd_sc, BD_SC_READY);
652 /* Get next BD. */
653 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
654 bdp = pinfo->tx_bd_base;
655 else
656 bdp++;
657 pinfo->tx_cur = bdp;
658
659 port->icount.tx++;
660 port->x_char = 0;
661 return 1;
662 }
663
664 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
665 cpm_uart_stop_tx(port);
666 return 0;
667 }
668
669 /* Pick next descriptor and fill from buffer */
670 bdp = pinfo->tx_cur;
671
672 while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) &&
673 xmit->tail != xmit->head) {
674 count = 0;
675 p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
676 while (count < pinfo->tx_fifosize) {
677 *p++ = xmit->buf[xmit->tail];
678 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
679 port->icount.tx++;
680 count++;
681 if (xmit->head == xmit->tail)
682 break;
683 }
684 out_be16(&bdp->cbd_datlen, count);
685 setbits16(&bdp->cbd_sc, BD_SC_READY);
686 /* Get next BD. */
687 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
688 bdp = pinfo->tx_bd_base;
689 else
690 bdp++;
691 }
692 pinfo->tx_cur = bdp;
693
694 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
695 uart_write_wakeup(port);
696
697 if (uart_circ_empty(xmit)) {
698 cpm_uart_stop_tx(port);
699 return 0;
700 }
701
702 return 1;
703 }
704
705 /*
706 * init buffer descriptors
707 */
708 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
709 {
710 int i;
711 u8 *mem_addr;
712 cbd_t __iomem *bdp;
713
714 pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
715
716 /* Set the physical address of the host memory
717 * buffers in the buffer descriptors, and the
718 * virtual address for us to work with.
719 */
720 mem_addr = pinfo->mem_addr;
721 bdp = pinfo->rx_cur = pinfo->rx_bd_base;
722 for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
723 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
724 out_be16(&bdp->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
725 mem_addr += pinfo->rx_fifosize;
726 }
727
728 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
729 out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
730
731 /* Set the physical address of the host memory
732 * buffers in the buffer descriptors, and the
733 * virtual address for us to work with.
734 */
735 mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
736 bdp = pinfo->tx_cur = pinfo->tx_bd_base;
737 for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
738 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
739 out_be16(&bdp->cbd_sc, BD_SC_INTRPT);
740 mem_addr += pinfo->tx_fifosize;
741 }
742
743 out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
744 out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_INTRPT);
745 }
746
747 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
748 {
749 scc_t __iomem *scp;
750 scc_uart_t __iomem *sup;
751
752 pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
753
754 scp = pinfo->sccp;
755 sup = pinfo->sccup;
756
757 /* Store address */
758 out_be16(&pinfo->sccup->scc_genscc.scc_rbase,
759 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
760 out_be16(&pinfo->sccup->scc_genscc.scc_tbase,
761 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
762
763 /* Set up the uart parameters in the
764 * parameter ram.
765 */
766
767 cpm_set_scc_fcr(sup);
768
769 out_be16(&sup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
770 out_be16(&sup->scc_maxidl, pinfo->rx_fifosize);
771 out_be16(&sup->scc_brkcr, 1);
772 out_be16(&sup->scc_parec, 0);
773 out_be16(&sup->scc_frmec, 0);
774 out_be16(&sup->scc_nosec, 0);
775 out_be16(&sup->scc_brkec, 0);
776 out_be16(&sup->scc_uaddr1, 0);
777 out_be16(&sup->scc_uaddr2, 0);
778 out_be16(&sup->scc_toseq, 0);
779 out_be16(&sup->scc_char1, 0x8000);
780 out_be16(&sup->scc_char2, 0x8000);
781 out_be16(&sup->scc_char3, 0x8000);
782 out_be16(&sup->scc_char4, 0x8000);
783 out_be16(&sup->scc_char5, 0x8000);
784 out_be16(&sup->scc_char6, 0x8000);
785 out_be16(&sup->scc_char7, 0x8000);
786 out_be16(&sup->scc_char8, 0x8000);
787 out_be16(&sup->scc_rccm, 0xc0ff);
788
789 /* Send the CPM an initialize command.
790 */
791 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
792
793 /* Set UART mode, 8 bit, no parity, one stop.
794 * Enable receive and transmit.
795 */
796 out_be32(&scp->scc_gsmrh, 0);
797 out_be32(&scp->scc_gsmrl,
798 SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
799
800 /* Enable rx interrupts and clear all pending events. */
801 out_be16(&scp->scc_sccm, 0);
802 out_be16(&scp->scc_scce, 0xffff);
803 out_be16(&scp->scc_dsr, 0x7e7e);
804 out_be16(&scp->scc_psmr, 0x3000);
805
806 setbits32(&scp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
807 }
808
809 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
810 {
811 smc_t __iomem *sp;
812 smc_uart_t __iomem *up;
813
814 pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
815
816 sp = pinfo->smcp;
817 up = pinfo->smcup;
818
819 /* Store address */
820 out_be16(&pinfo->smcup->smc_rbase,
821 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
822 out_be16(&pinfo->smcup->smc_tbase,
823 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
824
825 /*
826 * In case SMC1 is being relocated...
827 */
828 #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
829 out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase));
830 out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase));
831 out_be32(&up->smc_rstate, 0);
832 out_be32(&up->smc_tstate, 0);
833 out_be16(&up->smc_brkcr, 1); /* number of break chars */
834 out_be16(&up->smc_brkec, 0);
835 #endif
836
837 /* Set up the uart parameters in the
838 * parameter ram.
839 */
840 cpm_set_smc_fcr(up);
841
842 /* Using idle charater time requires some additional tuning. */
843 out_be16(&up->smc_mrblr, pinfo->rx_fifosize);
844 out_be16(&up->smc_maxidl, pinfo->rx_fifosize);
845 out_be16(&up->smc_brklen, 0);
846 out_be16(&up->smc_brkec, 0);
847 out_be16(&up->smc_brkcr, 1);
848
849 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
850
851 /* Set UART mode, 8 bit, no parity, one stop.
852 * Enable receive and transmit.
853 */
854 out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
855
856 /* Enable only rx interrupts clear all pending events. */
857 out_8(&sp->smc_smcm, 0);
858 out_8(&sp->smc_smce, 0xff);
859
860 setbits16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
861 }
862
863 /*
864 * Initialize port. This is called from early_console stuff
865 * so we have to be careful here !
866 */
867 static int cpm_uart_request_port(struct uart_port *port)
868 {
869 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
870 int ret;
871
872 pr_debug("CPM uart[%d]:request port\n", port->line);
873
874 if (pinfo->flags & FLAG_CONSOLE)
875 return 0;
876
877 if (IS_SMC(pinfo)) {
878 clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
879 clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
880 } else {
881 clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
882 clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
883 }
884
885 ret = cpm_uart_allocbuf(pinfo, 0);
886
887 if (ret)
888 return ret;
889
890 cpm_uart_initbd(pinfo);
891 if (IS_SMC(pinfo))
892 cpm_uart_init_smc(pinfo);
893 else
894 cpm_uart_init_scc(pinfo);
895
896 return 0;
897 }
898
899 static void cpm_uart_release_port(struct uart_port *port)
900 {
901 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
902
903 if (!(pinfo->flags & FLAG_CONSOLE))
904 cpm_uart_freebuf(pinfo);
905 }
906
907 /*
908 * Configure/autoconfigure the port.
909 */
910 static void cpm_uart_config_port(struct uart_port *port, int flags)
911 {
912 pr_debug("CPM uart[%d]:config_port\n", port->line);
913
914 if (flags & UART_CONFIG_TYPE) {
915 port->type = PORT_CPM;
916 cpm_uart_request_port(port);
917 }
918 }
919 static struct uart_ops cpm_uart_pops = {
920 .tx_empty = cpm_uart_tx_empty,
921 .set_mctrl = cpm_uart_set_mctrl,
922 .get_mctrl = cpm_uart_get_mctrl,
923 .stop_tx = cpm_uart_stop_tx,
924 .start_tx = cpm_uart_start_tx,
925 .stop_rx = cpm_uart_stop_rx,
926 .enable_ms = cpm_uart_enable_ms,
927 .break_ctl = cpm_uart_break_ctl,
928 .startup = cpm_uart_startup,
929 .shutdown = cpm_uart_shutdown,
930 .set_termios = cpm_uart_set_termios,
931 .type = cpm_uart_type,
932 .release_port = cpm_uart_release_port,
933 .request_port = cpm_uart_request_port,
934 .config_port = cpm_uart_config_port,
935 .verify_port = cpm_uart_verify_port,
936 };
937
938 #ifdef CONFIG_PPC_CPM_NEW_BINDING
939 struct uart_cpm_port cpm_uart_ports[UART_NR];
940
941 static int cpm_uart_init_port(struct device_node *np,
942 struct uart_cpm_port *pinfo)
943 {
944 const u32 *data;
945 void __iomem *mem, *pram;
946 int len;
947 int ret;
948
949 data = of_get_property(np, "fsl,cpm-brg", &len);
950 if (!data || len != 4) {
951 printk(KERN_ERR "CPM UART %s has no/invalid "
952 "fsl,cpm-brg property.\n", np->name);
953 return -EINVAL;
954 }
955 pinfo->brg = *data;
956
957 data = of_get_property(np, "fsl,cpm-command", &len);
958 if (!data || len != 4) {
959 printk(KERN_ERR "CPM UART %s has no/invalid "
960 "fsl,cpm-command property.\n", np->name);
961 return -EINVAL;
962 }
963 pinfo->command = *data;
964
965 mem = of_iomap(np, 0);
966 if (!mem)
967 return -ENOMEM;
968
969 pram = of_iomap(np, 1);
970 if (!pram) {
971 ret = -ENOMEM;
972 goto out_mem;
973 }
974
975 if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") ||
976 of_device_is_compatible(np, "fsl,cpm2-scc-uart")) {
977 pinfo->sccp = mem;
978 pinfo->sccup = pram;
979 } else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") ||
980 of_device_is_compatible(np, "fsl,cpm2-smc-uart")) {
981 pinfo->flags |= FLAG_SMC;
982 pinfo->smcp = mem;
983 pinfo->smcup = pram;
984 } else {
985 ret = -ENODEV;
986 goto out_pram;
987 }
988
989 pinfo->tx_nrfifos = TX_NUM_FIFO;
990 pinfo->tx_fifosize = TX_BUF_SIZE;
991 pinfo->rx_nrfifos = RX_NUM_FIFO;
992 pinfo->rx_fifosize = RX_BUF_SIZE;
993
994 pinfo->port.uartclk = ppc_proc_freq;
995 pinfo->port.mapbase = (unsigned long)mem;
996 pinfo->port.type = PORT_CPM;
997 pinfo->port.ops = &cpm_uart_pops,
998 pinfo->port.iotype = UPIO_MEM;
999 spin_lock_init(&pinfo->port.lock);
1000
1001 pinfo->port.irq = of_irq_to_resource(np, 0, NULL);
1002 if (pinfo->port.irq == NO_IRQ) {
1003 ret = -EINVAL;
1004 goto out_pram;
1005 }
1006
1007 return cpm_uart_request_port(&pinfo->port);
1008
1009 out_pram:
1010 iounmap(pram);
1011 out_mem:
1012 iounmap(mem);
1013 return ret;
1014 }
1015
1016 #else
1017
1018 struct uart_cpm_port cpm_uart_ports[UART_NR] = {
1019 [UART_SMC1] = {
1020 .port = {
1021 .irq = SMC1_IRQ,
1022 .ops = &cpm_uart_pops,
1023 .iotype = UPIO_MEM,
1024 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SMC1].port.lock),
1025 },
1026 .flags = FLAG_SMC,
1027 .tx_nrfifos = TX_NUM_FIFO,
1028 .tx_fifosize = TX_BUF_SIZE,
1029 .rx_nrfifos = RX_NUM_FIFO,
1030 .rx_fifosize = RX_BUF_SIZE,
1031 .set_lineif = smc1_lineif,
1032 },
1033 [UART_SMC2] = {
1034 .port = {
1035 .irq = SMC2_IRQ,
1036 .ops = &cpm_uart_pops,
1037 .iotype = UPIO_MEM,
1038 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SMC2].port.lock),
1039 },
1040 .flags = FLAG_SMC,
1041 .tx_nrfifos = TX_NUM_FIFO,
1042 .tx_fifosize = TX_BUF_SIZE,
1043 .rx_nrfifos = RX_NUM_FIFO,
1044 .rx_fifosize = RX_BUF_SIZE,
1045 .set_lineif = smc2_lineif,
1046 #ifdef CONFIG_SERIAL_CPM_ALT_SMC2
1047 .is_portb = 1,
1048 #endif
1049 },
1050 [UART_SCC1] = {
1051 .port = {
1052 .irq = SCC1_IRQ,
1053 .ops = &cpm_uart_pops,
1054 .iotype = UPIO_MEM,
1055 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC1].port.lock),
1056 },
1057 .tx_nrfifos = TX_NUM_FIFO,
1058 .tx_fifosize = TX_BUF_SIZE,
1059 .rx_nrfifos = RX_NUM_FIFO,
1060 .rx_fifosize = RX_BUF_SIZE,
1061 .set_lineif = scc1_lineif,
1062 .wait_closing = SCC_WAIT_CLOSING,
1063 },
1064 [UART_SCC2] = {
1065 .port = {
1066 .irq = SCC2_IRQ,
1067 .ops = &cpm_uart_pops,
1068 .iotype = UPIO_MEM,
1069 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC2].port.lock),
1070 },
1071 .tx_nrfifos = TX_NUM_FIFO,
1072 .tx_fifosize = TX_BUF_SIZE,
1073 .rx_nrfifos = RX_NUM_FIFO,
1074 .rx_fifosize = RX_BUF_SIZE,
1075 .set_lineif = scc2_lineif,
1076 .wait_closing = SCC_WAIT_CLOSING,
1077 },
1078 [UART_SCC3] = {
1079 .port = {
1080 .irq = SCC3_IRQ,
1081 .ops = &cpm_uart_pops,
1082 .iotype = UPIO_MEM,
1083 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC3].port.lock),
1084 },
1085 .tx_nrfifos = TX_NUM_FIFO,
1086 .tx_fifosize = TX_BUF_SIZE,
1087 .rx_nrfifos = RX_NUM_FIFO,
1088 .rx_fifosize = RX_BUF_SIZE,
1089 .set_lineif = scc3_lineif,
1090 .wait_closing = SCC_WAIT_CLOSING,
1091 },
1092 [UART_SCC4] = {
1093 .port = {
1094 .irq = SCC4_IRQ,
1095 .ops = &cpm_uart_pops,
1096 .iotype = UPIO_MEM,
1097 .lock = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC4].port.lock),
1098 },
1099 .tx_nrfifos = TX_NUM_FIFO,
1100 .tx_fifosize = TX_BUF_SIZE,
1101 .rx_nrfifos = RX_NUM_FIFO,
1102 .rx_fifosize = RX_BUF_SIZE,
1103 .set_lineif = scc4_lineif,
1104 .wait_closing = SCC_WAIT_CLOSING,
1105 },
1106 };
1107
1108 int cpm_uart_drv_get_platform_data(struct platform_device *pdev, int is_con)
1109 {
1110 struct resource *r;
1111 struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1112 int idx; /* It is UART_SMCx or UART_SCCx index */
1113 struct uart_cpm_port *pinfo;
1114 int line;
1115 u32 mem, pram;
1116
1117 idx = pdata->fs_no = fs_uart_get_id(pdata);
1118
1119 line = cpm_uart_id2nr(idx);
1120 if(line < 0) {
1121 printk(KERN_ERR"%s(): port %d is not registered", __FUNCTION__, idx);
1122 return -EINVAL;
1123 }
1124
1125 pinfo = (struct uart_cpm_port *) &cpm_uart_ports[idx];
1126
1127 pinfo->brg = pdata->brg;
1128
1129 if (!is_con) {
1130 pinfo->port.line = line;
1131 pinfo->port.flags = UPF_BOOT_AUTOCONF;
1132 }
1133
1134 if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs")))
1135 return -EINVAL;
1136 mem = (u32)ioremap(r->start, r->end - r->start + 1);
1137
1138 if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram")))
1139 return -EINVAL;
1140 pram = (u32)ioremap(r->start, r->end - r->start + 1);
1141
1142 if(idx > fsid_smc2_uart) {
1143 pinfo->sccp = (scc_t *)mem;
1144 pinfo->sccup = (scc_uart_t *)pram;
1145 } else {
1146 pinfo->smcp = (smc_t *)mem;
1147 pinfo->smcup = (smc_uart_t *)pram;
1148 }
1149 pinfo->tx_nrfifos = pdata->tx_num_fifo;
1150 pinfo->tx_fifosize = pdata->tx_buf_size;
1151
1152 pinfo->rx_nrfifos = pdata->rx_num_fifo;
1153 pinfo->rx_fifosize = pdata->rx_buf_size;
1154
1155 pinfo->port.uartclk = pdata->uart_clk;
1156 pinfo->port.mapbase = (unsigned long)mem;
1157 pinfo->port.irq = platform_get_irq(pdev, 0);
1158
1159 return 0;
1160 }
1161 #endif
1162
1163 #ifdef CONFIG_SERIAL_CPM_CONSOLE
1164 /*
1165 * Print a string to the serial port trying not to disturb
1166 * any possible real use of the port...
1167 *
1168 * Note that this is called with interrupts already disabled
1169 */
1170 static void cpm_uart_console_write(struct console *co, const char *s,
1171 u_int count)
1172 {
1173 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1174 struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
1175 #else
1176 struct uart_cpm_port *pinfo =
1177 &cpm_uart_ports[cpm_uart_port_map[co->index]];
1178 #endif
1179 unsigned int i;
1180 cbd_t __iomem *bdp, *bdbase;
1181 unsigned char *cp;
1182
1183 /* Get the address of the host memory buffer.
1184 */
1185 bdp = pinfo->tx_cur;
1186 bdbase = pinfo->tx_bd_base;
1187
1188 /*
1189 * Now, do each character. This is not as bad as it looks
1190 * since this is a holding FIFO and not a transmitting FIFO.
1191 * We could add the complexity of filling the entire transmit
1192 * buffer, but we would just wait longer between accesses......
1193 */
1194 for (i = 0; i < count; i++, s++) {
1195 /* Wait for transmitter fifo to empty.
1196 * Ready indicates output is ready, and xmt is doing
1197 * that, not that it is ready for us to send.
1198 */
1199 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1200 ;
1201
1202 /* Send the character out.
1203 * If the buffer address is in the CPM DPRAM, don't
1204 * convert it.
1205 */
1206 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
1207 *cp = *s;
1208
1209 out_be16(&bdp->cbd_datlen, 1);
1210 setbits16(&bdp->cbd_sc, BD_SC_READY);
1211
1212 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
1213 bdp = bdbase;
1214 else
1215 bdp++;
1216
1217 /* if a LF, also do CR... */
1218 if (*s == 10) {
1219 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1220 ;
1221
1222 cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
1223 *cp = 13;
1224
1225 out_be16(&bdp->cbd_datlen, 1);
1226 setbits16(&bdp->cbd_sc, BD_SC_READY);
1227
1228 if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
1229 bdp = bdbase;
1230 else
1231 bdp++;
1232 }
1233 }
1234
1235 /*
1236 * Finally, Wait for transmitter & holding register to empty
1237 * and restore the IER
1238 */
1239 while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
1240 ;
1241
1242 pinfo->tx_cur = bdp;
1243 }
1244
1245
1246 static int __init cpm_uart_console_setup(struct console *co, char *options)
1247 {
1248 int baud = 38400;
1249 int bits = 8;
1250 int parity = 'n';
1251 int flow = 'n';
1252 int ret;
1253 struct uart_cpm_port *pinfo;
1254 struct uart_port *port;
1255
1256 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1257 struct device_node *np = NULL;
1258 int i = 0;
1259
1260 if (co->index >= UART_NR) {
1261 printk(KERN_ERR "cpm_uart: console index %d too high\n",
1262 co->index);
1263 return -ENODEV;
1264 }
1265
1266 do {
1267 np = of_find_node_by_type(np, "serial");
1268 if (!np)
1269 return -ENODEV;
1270
1271 if (!of_device_is_compatible(np, "fsl,cpm1-smc-uart") &&
1272 !of_device_is_compatible(np, "fsl,cpm1-scc-uart") &&
1273 !of_device_is_compatible(np, "fsl,cpm2-smc-uart") &&
1274 !of_device_is_compatible(np, "fsl,cpm2-scc-uart"))
1275 i--;
1276 } while (i++ != co->index);
1277
1278 pinfo = &cpm_uart_ports[co->index];
1279
1280 pinfo->flags |= FLAG_CONSOLE;
1281 port = &pinfo->port;
1282
1283 ret = cpm_uart_init_port(np, pinfo);
1284 of_node_put(np);
1285 if (ret)
1286 return ret;
1287
1288 #else
1289
1290 struct fs_uart_platform_info *pdata;
1291 struct platform_device* pdev = early_uart_get_pdev(co->index);
1292
1293 if (!pdev) {
1294 pr_info("cpm_uart: console: compat mode\n");
1295 /* compatibility - will be cleaned up */
1296 cpm_uart_init_portdesc();
1297 }
1298
1299 port =
1300 (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]];
1301 pinfo = (struct uart_cpm_port *)port;
1302 if (!pdev) {
1303 if (pinfo->set_lineif)
1304 pinfo->set_lineif(pinfo);
1305 } else {
1306 pdata = pdev->dev.platform_data;
1307 if (pdata)
1308 if (pdata->init_ioports)
1309 pdata->init_ioports(pdata);
1310
1311 cpm_uart_drv_get_platform_data(pdev, 1);
1312 }
1313
1314 pinfo->flags |= FLAG_CONSOLE;
1315 #endif
1316
1317 if (options) {
1318 uart_parse_options(options, &baud, &parity, &bits, &flow);
1319 } else {
1320 if ((baud = uart_baudrate()) == -1)
1321 baud = 9600;
1322 }
1323
1324 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
1325 udbg_putc = NULL;
1326 #endif
1327
1328 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
1329
1330 if (IS_SMC(pinfo)) {
1331 clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
1332 clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
1333 } else {
1334 clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
1335 clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1336 }
1337
1338 ret = cpm_uart_allocbuf(pinfo, 1);
1339
1340 if (ret)
1341 return ret;
1342
1343 cpm_uart_initbd(pinfo);
1344
1345 if (IS_SMC(pinfo))
1346 cpm_uart_init_smc(pinfo);
1347 else
1348 cpm_uart_init_scc(pinfo);
1349
1350 uart_set_options(port, co, baud, parity, bits, flow);
1351 cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
1352
1353 return 0;
1354 }
1355
1356 static struct uart_driver cpm_reg;
1357 static struct console cpm_scc_uart_console = {
1358 .name = "ttyCPM",
1359 .write = cpm_uart_console_write,
1360 .device = uart_console_device,
1361 .setup = cpm_uart_console_setup,
1362 .flags = CON_PRINTBUFFER,
1363 .index = -1,
1364 .data = &cpm_reg,
1365 };
1366
1367 static int __init cpm_uart_console_init(void)
1368 {
1369 register_console(&cpm_scc_uart_console);
1370 return 0;
1371 }
1372
1373 console_initcall(cpm_uart_console_init);
1374
1375 #define CPM_UART_CONSOLE &cpm_scc_uart_console
1376 #else
1377 #define CPM_UART_CONSOLE NULL
1378 #endif
1379
1380 static struct uart_driver cpm_reg = {
1381 .owner = THIS_MODULE,
1382 .driver_name = "ttyCPM",
1383 .dev_name = "ttyCPM",
1384 .major = SERIAL_CPM_MAJOR,
1385 .minor = SERIAL_CPM_MINOR,
1386 .cons = CPM_UART_CONSOLE,
1387 .nr = UART_NR,
1388 };
1389
1390 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1391 static int probe_index;
1392
1393 static int __devinit cpm_uart_probe(struct of_device *ofdev,
1394 const struct of_device_id *match)
1395 {
1396 int index = probe_index++;
1397 struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
1398 int ret;
1399
1400 pinfo->port.line = index;
1401
1402 if (index >= UART_NR)
1403 return -ENODEV;
1404
1405 dev_set_drvdata(&ofdev->dev, pinfo);
1406
1407 ret = cpm_uart_init_port(ofdev->node, pinfo);
1408 if (ret)
1409 return ret;
1410
1411 return uart_add_one_port(&cpm_reg, &pinfo->port);
1412 }
1413
1414 static int __devexit cpm_uart_remove(struct of_device *ofdev)
1415 {
1416 struct uart_cpm_port *pinfo = dev_get_drvdata(&ofdev->dev);
1417 return uart_remove_one_port(&cpm_reg, &pinfo->port);
1418 }
1419
1420 static struct of_device_id cpm_uart_match[] = {
1421 {
1422 .compatible = "fsl,cpm1-smc-uart",
1423 },
1424 {
1425 .compatible = "fsl,cpm1-scc-uart",
1426 },
1427 {
1428 .compatible = "fsl,cpm2-smc-uart",
1429 },
1430 {
1431 .compatible = "fsl,cpm2-scc-uart",
1432 },
1433 {}
1434 };
1435
1436 static struct of_platform_driver cpm_uart_driver = {
1437 .name = "cpm_uart",
1438 .match_table = cpm_uart_match,
1439 .probe = cpm_uart_probe,
1440 .remove = cpm_uart_remove,
1441 };
1442
1443 static int __init cpm_uart_init(void)
1444 {
1445 int ret = uart_register_driver(&cpm_reg);
1446 if (ret)
1447 return ret;
1448
1449 ret = of_register_platform_driver(&cpm_uart_driver);
1450 if (ret)
1451 uart_unregister_driver(&cpm_reg);
1452
1453 return ret;
1454 }
1455
1456 static void __exit cpm_uart_exit(void)
1457 {
1458 of_unregister_platform_driver(&cpm_uart_driver);
1459 uart_unregister_driver(&cpm_reg);
1460 }
1461 #else
1462 static int cpm_uart_drv_probe(struct device *dev)
1463 {
1464 struct platform_device *pdev = to_platform_device(dev);
1465 struct fs_uart_platform_info *pdata;
1466 int ret = -ENODEV;
1467
1468 if(!pdev) {
1469 printk(KERN_ERR"CPM UART: platform data missing!\n");
1470 return ret;
1471 }
1472
1473 pdata = pdev->dev.platform_data;
1474
1475 if ((ret = cpm_uart_drv_get_platform_data(pdev, 0)))
1476 return ret;
1477
1478 pr_debug("cpm_uart_drv_probe: Adding CPM UART %d\n", cpm_uart_id2nr(pdata->fs_no));
1479
1480 if (pdata->init_ioports)
1481 pdata->init_ioports(pdata);
1482
1483 ret = uart_add_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1484
1485 return ret;
1486 }
1487
1488 static int cpm_uart_drv_remove(struct device *dev)
1489 {
1490 struct platform_device *pdev = to_platform_device(dev);
1491 struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1492
1493 pr_debug("cpm_uart_drv_remove: Removing CPM UART %d\n",
1494 cpm_uart_id2nr(pdata->fs_no));
1495
1496 uart_remove_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1497 return 0;
1498 }
1499
1500 static struct device_driver cpm_smc_uart_driver = {
1501 .name = "fsl-cpm-smc:uart",
1502 .bus = &platform_bus_type,
1503 .probe = cpm_uart_drv_probe,
1504 .remove = cpm_uart_drv_remove,
1505 };
1506
1507 static struct device_driver cpm_scc_uart_driver = {
1508 .name = "fsl-cpm-scc:uart",
1509 .bus = &platform_bus_type,
1510 .probe = cpm_uart_drv_probe,
1511 .remove = cpm_uart_drv_remove,
1512 };
1513
1514 /*
1515 This is supposed to match uart devices on platform bus,
1516 */
1517 static int match_is_uart (struct device* dev, void* data)
1518 {
1519 struct platform_device* pdev = container_of(dev, struct platform_device, dev);
1520 int ret = 0;
1521 /* this was setfunc as uart */
1522 if(strstr(pdev->name,":uart")) {
1523 ret = 1;
1524 }
1525 return ret;
1526 }
1527
1528
1529 static int cpm_uart_init(void) {
1530
1531 int ret;
1532 int i;
1533 struct device *dev;
1534 printk(KERN_INFO "Serial: CPM driver $Revision: 0.02 $\n");
1535
1536 /* lookup the bus for uart devices */
1537 dev = bus_find_device(&platform_bus_type, NULL, 0, match_is_uart);
1538
1539 /* There are devices on the bus - all should be OK */
1540 if (dev) {
1541 cpm_uart_count();
1542 cpm_reg.nr = cpm_uart_nr;
1543
1544 if (!(ret = uart_register_driver(&cpm_reg))) {
1545 if ((ret = driver_register(&cpm_smc_uart_driver))) {
1546 uart_unregister_driver(&cpm_reg);
1547 return ret;
1548 }
1549 if ((ret = driver_register(&cpm_scc_uart_driver))) {
1550 driver_unregister(&cpm_scc_uart_driver);
1551 uart_unregister_driver(&cpm_reg);
1552 }
1553 }
1554 } else {
1555 /* No capable platform devices found - falling back to legacy mode */
1556 pr_info("cpm_uart: WARNING: no UART devices found on platform bus!\n");
1557 pr_info(
1558 "cpm_uart: the driver will guess configuration, but this mode is no longer supported.\n");
1559
1560 /* Don't run this again, if the console driver did it already */
1561 if (cpm_uart_nr == 0)
1562 cpm_uart_init_portdesc();
1563
1564 cpm_reg.nr = cpm_uart_nr;
1565 ret = uart_register_driver(&cpm_reg);
1566
1567 if (ret)
1568 return ret;
1569
1570 for (i = 0; i < cpm_uart_nr; i++) {
1571 int con = cpm_uart_port_map[i];
1572 cpm_uart_ports[con].port.line = i;
1573 cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF;
1574 if (cpm_uart_ports[con].set_lineif)
1575 cpm_uart_ports[con].set_lineif(&cpm_uart_ports[con]);
1576 uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1577 }
1578
1579 }
1580 return ret;
1581 }
1582
1583 static void __exit cpm_uart_exit(void)
1584 {
1585 driver_unregister(&cpm_scc_uart_driver);
1586 driver_unregister(&cpm_smc_uart_driver);
1587 uart_unregister_driver(&cpm_reg);
1588 }
1589 #endif
1590
1591 module_init(cpm_uart_init);
1592 module_exit(cpm_uart_exit);
1593
1594 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1595 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1596 MODULE_LICENSE("GPL");
1597 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);
Linux -mm trees (mirror)