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