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[deliverable/linux.git] / 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 Freescale Semiconductor, Inc.
14 * (C) 2004 Intracom, S.A.
15 * (C) 2005 MontaVista Software, Inc. by Vitaly Bordug <vbordug@ru.mvista.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 *
31 */
32
33 #include <linux/config.h>
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
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 #include <asm/delay.h>
48
49 #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
50 #define SUPPORT_SYSRQ
51 #endif
52
53 #include <linux/serial_core.h>
54 #include <linux/kernel.h>
55
56 #include "cpm_uart.h"
57
58 /***********************************************************************/
59
60 /* Track which ports are configured as uarts */
61 int cpm_uart_port_map[UART_NR];
62 /* How many ports did we config as uarts */
63 int cpm_uart_nr;
64
65 /**************************************************************/
66
67 static int cpm_uart_tx_pump(struct uart_port *port);
68 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo);
69 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo);
70 static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
71
72 /**************************************************************/
73
74 static inline unsigned long cpu2cpm_addr(void *addr)
75 {
76 if ((unsigned long)addr >= CPM_ADDR)
77 return (unsigned long)addr;
78 return virt_to_bus(addr);
79 }
80
81 static inline void *cpm2cpu_addr(unsigned long addr)
82 {
83 if (addr >= CPM_ADDR)
84 return (void *)addr;
85 return bus_to_virt(addr);
86 }
87
88 /*
89 * Check, if transmit buffers are processed
90 */
91 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
92 {
93 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
94 volatile cbd_t *bdp = pinfo->tx_bd_base;
95 int ret = 0;
96
97 while (1) {
98 if (bdp->cbd_sc & BD_SC_READY)
99 break;
100
101 if (bdp->cbd_sc & BD_SC_WRAP) {
102 ret = TIOCSER_TEMT;
103 break;
104 }
105 bdp++;
106 }
107
108 pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
109
110 return ret;
111 }
112
113 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
114 {
115 /* Whee. Do nothing. */
116 }
117
118 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
119 {
120 /* Whee. Do nothing. */
121 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
122 }
123
124 /*
125 * Stop transmitter
126 */
127 static void cpm_uart_stop_tx(struct uart_port *port)
128 {
129 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
130 volatile smc_t *smcp = pinfo->smcp;
131 volatile scc_t *sccp = pinfo->sccp;
132
133 pr_debug("CPM uart[%d]:stop tx\n", port->line);
134
135 if (IS_SMC(pinfo))
136 smcp->smc_smcm &= ~SMCM_TX;
137 else
138 sccp->scc_sccm &= ~UART_SCCM_TX;
139 }
140
141 /*
142 * Start transmitter
143 */
144 static void cpm_uart_start_tx(struct uart_port *port)
145 {
146 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
147 volatile smc_t *smcp = pinfo->smcp;
148 volatile scc_t *sccp = pinfo->sccp;
149
150 pr_debug("CPM uart[%d]:start tx\n", port->line);
151
152 if (IS_SMC(pinfo)) {
153 if (smcp->smc_smcm & SMCM_TX)
154 return;
155 } else {
156 if (sccp->scc_sccm & UART_SCCM_TX)
157 return;
158 }
159
160 if (cpm_uart_tx_pump(port) != 0) {
161 if (IS_SMC(pinfo)) {
162 smcp->smc_smcm |= SMCM_TX;
163 smcp->smc_smcmr |= SMCMR_TEN;
164 } else {
165 sccp->scc_sccm |= UART_SCCM_TX;
166 pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENT;
167 }
168 }
169 }
170
171 /*
172 * Stop receiver
173 */
174 static void cpm_uart_stop_rx(struct uart_port *port)
175 {
176 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
177 volatile smc_t *smcp = pinfo->smcp;
178 volatile scc_t *sccp = pinfo->sccp;
179
180 pr_debug("CPM uart[%d]:stop rx\n", port->line);
181
182 if (IS_SMC(pinfo))
183 smcp->smc_smcm &= ~SMCM_RX;
184 else
185 sccp->scc_sccm &= ~UART_SCCM_RX;
186 }
187
188 /*
189 * Enable Modem status interrupts
190 */
191 static void cpm_uart_enable_ms(struct uart_port *port)
192 {
193 pr_debug("CPM uart[%d]:enable ms\n", port->line);
194 }
195
196 /*
197 * Generate a break.
198 */
199 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
200 {
201 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
202 int line = pinfo - cpm_uart_ports;
203
204 pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
205 break_state);
206
207 if (break_state)
208 cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
209 else
210 cpm_line_cr_cmd(line, CPM_CR_RESTART_TX);
211 }
212
213 /*
214 * Transmit characters, refill buffer descriptor, if possible
215 */
216 static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs)
217 {
218 pr_debug("CPM uart[%d]:TX INT\n", port->line);
219
220 cpm_uart_tx_pump(port);
221 }
222
223 /*
224 * Receive characters
225 */
226 static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
227 {
228 int i;
229 unsigned char ch, *cp;
230 struct tty_struct *tty = port->info->tty;
231 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
232 volatile cbd_t *bdp;
233 u16 status;
234 unsigned int flg;
235
236 pr_debug("CPM uart[%d]:RX INT\n", port->line);
237
238 /* Just loop through the closed BDs and copy the characters into
239 * the buffer.
240 */
241 bdp = pinfo->rx_cur;
242 for (;;) {
243 /* get status */
244 status = bdp->cbd_sc;
245 /* If this one is empty, return happy */
246 if (status & BD_SC_EMPTY)
247 break;
248
249 /* get number of characters, and check spce in flip-buffer */
250 i = bdp->cbd_datlen;
251
252 /* If we have not enough room in tty flip buffer, then we try
253 * later, which will be the next rx-interrupt or a timeout
254 */
255 if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) {
256 tty->flip.work.func((void *)tty);
257 if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) {
258 printk(KERN_WARNING "TTY_DONT_FLIP set\n");
259 return;
260 }
261 }
262
263 /* get pointer */
264 cp = cpm2cpu_addr(bdp->cbd_bufaddr);
265
266 /* loop through the buffer */
267 while (i-- > 0) {
268 ch = *cp++;
269 port->icount.rx++;
270 flg = TTY_NORMAL;
271
272 if (status &
273 (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
274 goto handle_error;
275 if (uart_handle_sysrq_char(port, ch, regs))
276 continue;
277
278 error_return:
279 *tty->flip.char_buf_ptr++ = ch;
280 *tty->flip.flag_buf_ptr++ = flg;
281 tty->flip.count++;
282
283 } /* End while (i--) */
284
285 /* This BD is ready to be used again. Clear status. get next */
286 bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
287 bdp->cbd_sc |= BD_SC_EMPTY;
288
289 if (bdp->cbd_sc & BD_SC_WRAP)
290 bdp = pinfo->rx_bd_base;
291 else
292 bdp++;
293
294 } /* End for (;;) */
295
296 /* Write back buffer pointer */
297 pinfo->rx_cur = (volatile cbd_t *) bdp;
298
299 /* activate BH processing */
300 tty_flip_buffer_push(tty);
301
302 return;
303
304 /* Error processing */
305
306 handle_error:
307 /* Statistics */
308 if (status & BD_SC_BR)
309 port->icount.brk++;
310 if (status & BD_SC_PR)
311 port->icount.parity++;
312 if (status & BD_SC_FR)
313 port->icount.frame++;
314 if (status & BD_SC_OV)
315 port->icount.overrun++;
316
317 /* Mask out ignored conditions */
318 status &= port->read_status_mask;
319
320 /* Handle the remaining ones */
321 if (status & BD_SC_BR)
322 flg = TTY_BREAK;
323 else if (status & BD_SC_PR)
324 flg = TTY_PARITY;
325 else if (status & BD_SC_FR)
326 flg = TTY_FRAME;
327
328 /* overrun does not affect the current character ! */
329 if (status & BD_SC_OV) {
330 ch = 0;
331 flg = TTY_OVERRUN;
332 /* We skip this buffer */
333 /* CHECK: Is really nothing senseful there */
334 /* ASSUMPTION: it contains nothing valid */
335 i = 0;
336 }
337 #ifdef SUPPORT_SYSRQ
338 port->sysrq = 0;
339 #endif
340 goto error_return;
341 }
342
343 /*
344 * Asynchron mode interrupt handler
345 */
346 static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs)
347 {
348 u8 events;
349 struct uart_port *port = (struct uart_port *)data;
350 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
351 volatile smc_t *smcp = pinfo->smcp;
352 volatile scc_t *sccp = pinfo->sccp;
353
354 pr_debug("CPM uart[%d]:IRQ\n", port->line);
355
356 if (IS_SMC(pinfo)) {
357 events = smcp->smc_smce;
358 smcp->smc_smce = events;
359 if (events & SMCM_BRKE)
360 uart_handle_break(port);
361 if (events & SMCM_RX)
362 cpm_uart_int_rx(port, regs);
363 if (events & SMCM_TX)
364 cpm_uart_int_tx(port, regs);
365 } else {
366 events = sccp->scc_scce;
367 sccp->scc_scce = events;
368 if (events & UART_SCCM_BRKE)
369 uart_handle_break(port);
370 if (events & UART_SCCM_RX)
371 cpm_uart_int_rx(port, regs);
372 if (events & UART_SCCM_TX)
373 cpm_uart_int_tx(port, regs);
374 }
375 return (events) ? IRQ_HANDLED : IRQ_NONE;
376 }
377
378 static int cpm_uart_startup(struct uart_port *port)
379 {
380 int retval;
381 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
382 int line = pinfo - cpm_uart_ports;
383
384 pr_debug("CPM uart[%d]:startup\n", port->line);
385
386 /* Install interrupt handler. */
387 retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
388 if (retval)
389 return retval;
390
391 /* Startup rx-int */
392 if (IS_SMC(pinfo)) {
393 pinfo->smcp->smc_smcm |= SMCM_RX;
394 pinfo->smcp->smc_smcmr |= SMCMR_REN;
395 } else {
396 pinfo->sccp->scc_sccm |= UART_SCCM_RX;
397 }
398
399 if (!(pinfo->flags & FLAG_CONSOLE))
400 cpm_line_cr_cmd(line,CPM_CR_INIT_TRX);
401 return 0;
402 }
403
404 inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
405 {
406 set_current_state(TASK_UNINTERRUPTIBLE);
407 schedule_timeout(pinfo->wait_closing);
408 }
409
410 /*
411 * Shutdown the uart
412 */
413 static void cpm_uart_shutdown(struct uart_port *port)
414 {
415 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
416 int line = pinfo - cpm_uart_ports;
417
418 pr_debug("CPM uart[%d]:shutdown\n", port->line);
419
420 /* free interrupt handler */
421 free_irq(port->irq, port);
422
423 /* If the port is not the console, disable Rx and Tx. */
424 if (!(pinfo->flags & FLAG_CONSOLE)) {
425 /* Wait for all the BDs marked sent */
426 while(!cpm_uart_tx_empty(port)) {
427 set_current_state(TASK_UNINTERRUPTIBLE);
428 schedule_timeout(2);
429 }
430
431 if (pinfo->wait_closing)
432 cpm_uart_wait_until_send(pinfo);
433
434 /* Stop uarts */
435 if (IS_SMC(pinfo)) {
436 volatile smc_t *smcp = pinfo->smcp;
437 smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
438 smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
439 } else {
440 volatile scc_t *sccp = pinfo->sccp;
441 sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
442 sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
443 }
444
445 /* Shut them really down and reinit buffer descriptors */
446 cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
447 cpm_uart_initbd(pinfo);
448 }
449 }
450
451 static void cpm_uart_set_termios(struct uart_port *port,
452 struct termios *termios, struct termios *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 volatile smc_t *smcp = pinfo->smcp;
460 volatile scc_t *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 * Set up parity check flag
513 */
514 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
515
516 port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
517 if (termios->c_iflag & INPCK)
518 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
519 if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
520 port->read_status_mask |= BD_SC_BR;
521
522 /*
523 * Characters to ignore
524 */
525 port->ignore_status_mask = 0;
526 if (termios->c_iflag & IGNPAR)
527 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
528 if (termios->c_iflag & IGNBRK) {
529 port->ignore_status_mask |= BD_SC_BR;
530 /*
531 * If we're ignore parity and break indicators, ignore
532 * overruns too. (For real raw support).
533 */
534 if (termios->c_iflag & IGNPAR)
535 port->ignore_status_mask |= BD_SC_OV;
536 }
537 /*
538 * !!! ignore all characters if CREAD is not set
539 */
540 if ((termios->c_cflag & CREAD) == 0)
541 port->read_status_mask &= ~BD_SC_EMPTY;
542
543 spin_lock_irqsave(&port->lock, flags);
544
545 /* Start bit has not been added (so don't, because we would just
546 * subtract it later), and we need to add one for the number of
547 * stops bits (there is always at least one).
548 */
549 bits++;
550 if (IS_SMC(pinfo)) {
551 /* Set the mode register. We want to keep a copy of the
552 * enables, because we want to put them back if they were
553 * present.
554 */
555 prev_mode = smcp->smc_smcmr;
556 smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART;
557 smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
558 } else {
559 sccp->scc_psmr = (sbits << 12) | scval;
560 }
561
562 cpm_set_brg(pinfo->brg - 1, baud);
563 spin_unlock_irqrestore(&port->lock, flags);
564
565 }
566
567 static const char *cpm_uart_type(struct uart_port *port)
568 {
569 pr_debug("CPM uart[%d]:uart_type\n", port->line);
570
571 return port->type == PORT_CPM ? "CPM UART" : NULL;
572 }
573
574 /*
575 * verify the new serial_struct (for TIOCSSERIAL).
576 */
577 static int cpm_uart_verify_port(struct uart_port *port,
578 struct serial_struct *ser)
579 {
580 int ret = 0;
581
582 pr_debug("CPM uart[%d]:verify_port\n", port->line);
583
584 if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
585 ret = -EINVAL;
586 if (ser->irq < 0 || ser->irq >= NR_IRQS)
587 ret = -EINVAL;
588 if (ser->baud_base < 9600)
589 ret = -EINVAL;
590 return ret;
591 }
592
593 /*
594 * Transmit characters, refill buffer descriptor, if possible
595 */
596 static int cpm_uart_tx_pump(struct uart_port *port)
597 {
598 volatile cbd_t *bdp;
599 unsigned char *p;
600 int count;
601 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
602 struct circ_buf *xmit = &port->info->xmit;
603
604 /* Handle xon/xoff */
605 if (port->x_char) {
606 /* Pick next descriptor and fill from buffer */
607 bdp = pinfo->tx_cur;
608
609 p = cpm2cpu_addr(bdp->cbd_bufaddr);
610
611 *p++ = port->x_char;
612 bdp->cbd_datlen = 1;
613 bdp->cbd_sc |= BD_SC_READY;
614 /* Get next BD. */
615 if (bdp->cbd_sc & BD_SC_WRAP)
616 bdp = pinfo->tx_bd_base;
617 else
618 bdp++;
619 pinfo->tx_cur = bdp;
620
621 port->icount.tx++;
622 port->x_char = 0;
623 return 1;
624 }
625
626 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
627 cpm_uart_stop_tx(port);
628 return 0;
629 }
630
631 /* Pick next descriptor and fill from buffer */
632 bdp = pinfo->tx_cur;
633
634 while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
635 count = 0;
636 p = cpm2cpu_addr(bdp->cbd_bufaddr);
637 while (count < pinfo->tx_fifosize) {
638 *p++ = xmit->buf[xmit->tail];
639 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
640 port->icount.tx++;
641 count++;
642 if (xmit->head == xmit->tail)
643 break;
644 }
645 bdp->cbd_datlen = count;
646 bdp->cbd_sc |= BD_SC_READY;
647 __asm__("eieio");
648 /* Get next BD. */
649 if (bdp->cbd_sc & BD_SC_WRAP)
650 bdp = pinfo->tx_bd_base;
651 else
652 bdp++;
653 }
654 pinfo->tx_cur = bdp;
655
656 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
657 uart_write_wakeup(port);
658
659 if (uart_circ_empty(xmit)) {
660 cpm_uart_stop_tx(port);
661 return 0;
662 }
663
664 return 1;
665 }
666
667 /*
668 * init buffer descriptors
669 */
670 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
671 {
672 int i;
673 u8 *mem_addr;
674 volatile cbd_t *bdp;
675
676 pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
677
678 /* Set the physical address of the host memory
679 * buffers in the buffer descriptors, and the
680 * virtual address for us to work with.
681 */
682 mem_addr = pinfo->mem_addr;
683 bdp = pinfo->rx_cur = pinfo->rx_bd_base;
684 for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
685 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
686 bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
687 mem_addr += pinfo->rx_fifosize;
688 }
689
690 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
691 bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
692
693 /* Set the physical address of the host memory
694 * buffers in the buffer descriptors, and the
695 * virtual address for us to work with.
696 */
697 mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
698 bdp = pinfo->tx_cur = pinfo->tx_bd_base;
699 for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
700 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
701 bdp->cbd_sc = BD_SC_INTRPT;
702 mem_addr += pinfo->tx_fifosize;
703 }
704
705 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
706 bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
707 }
708
709 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
710 {
711 int line = pinfo - cpm_uart_ports;
712 volatile scc_t *scp;
713 volatile scc_uart_t *sup;
714
715 pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
716
717 scp = pinfo->sccp;
718 sup = pinfo->sccup;
719
720 /* Store address */
721 pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE;
722 pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE;
723
724 /* Set up the uart parameters in the
725 * parameter ram.
726 */
727
728 cpm_set_scc_fcr(sup);
729
730 sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize;
731 sup->scc_maxidl = pinfo->rx_fifosize;
732 sup->scc_brkcr = 1;
733 sup->scc_parec = 0;
734 sup->scc_frmec = 0;
735 sup->scc_nosec = 0;
736 sup->scc_brkec = 0;
737 sup->scc_uaddr1 = 0;
738 sup->scc_uaddr2 = 0;
739 sup->scc_toseq = 0;
740 sup->scc_char1 = 0x8000;
741 sup->scc_char2 = 0x8000;
742 sup->scc_char3 = 0x8000;
743 sup->scc_char4 = 0x8000;
744 sup->scc_char5 = 0x8000;
745 sup->scc_char6 = 0x8000;
746 sup->scc_char7 = 0x8000;
747 sup->scc_char8 = 0x8000;
748 sup->scc_rccm = 0xc0ff;
749
750 /* Send the CPM an initialize command.
751 */
752 cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
753
754 /* Set UART mode, 8 bit, no parity, one stop.
755 * Enable receive and transmit.
756 */
757 scp->scc_gsmrh = 0;
758 scp->scc_gsmrl =
759 (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
760
761 /* Enable rx interrupts and clear all pending events. */
762 scp->scc_sccm = 0;
763 scp->scc_scce = 0xffff;
764 scp->scc_dsr = 0x7e7e;
765 scp->scc_psmr = 0x3000;
766
767 scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
768 }
769
770 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
771 {
772 int line = pinfo - cpm_uart_ports;
773 volatile smc_t *sp;
774 volatile smc_uart_t *up;
775
776 pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
777
778 sp = pinfo->smcp;
779 up = pinfo->smcup;
780
781 /* Store address */
782 pinfo->smcup->smc_rbase = (u_char *)pinfo->rx_bd_base - DPRAM_BASE;
783 pinfo->smcup->smc_tbase = (u_char *)pinfo->tx_bd_base - DPRAM_BASE;
784
785 /*
786 * In case SMC1 is being relocated...
787 */
788 #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
789 up->smc_rbptr = pinfo->smcup->smc_rbase;
790 up->smc_tbptr = pinfo->smcup->smc_tbase;
791 up->smc_rstate = 0;
792 up->smc_tstate = 0;
793 up->smc_brkcr = 1; /* number of break chars */
794 up->smc_brkec = 0;
795 #endif
796
797 /* Set up the uart parameters in the
798 * parameter ram.
799 */
800 cpm_set_smc_fcr(up);
801
802 /* Using idle charater time requires some additional tuning. */
803 up->smc_mrblr = pinfo->rx_fifosize;
804 up->smc_maxidl = pinfo->rx_fifosize;
805 up->smc_brklen = 0;
806 up->smc_brkec = 0;
807 up->smc_brkcr = 1;
808
809 cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
810
811 /* Set UART mode, 8 bit, no parity, one stop.
812 * Enable receive and transmit.
813 */
814 sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
815
816 /* Enable only rx interrupts clear all pending events. */
817 sp->smc_smcm = 0;
818 sp->smc_smce = 0xff;
819
820 sp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
821 }
822
823 /*
824 * Initialize port. This is called from early_console stuff
825 * so we have to be careful here !
826 */
827 static int cpm_uart_request_port(struct uart_port *port)
828 {
829 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
830 int ret;
831
832 pr_debug("CPM uart[%d]:request port\n", port->line);
833
834 if (pinfo->flags & FLAG_CONSOLE)
835 return 0;
836
837 /*
838 * Setup any port IO, connect any baud rate generators,
839 * etc. This is expected to be handled by board
840 * dependant code
841 */
842 if (pinfo->set_lineif)
843 pinfo->set_lineif(pinfo);
844
845 if (IS_SMC(pinfo)) {
846 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
847 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
848 } else {
849 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
850 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
851 }
852
853 ret = cpm_uart_allocbuf(pinfo, 0);
854
855 if (ret)
856 return ret;
857
858 cpm_uart_initbd(pinfo);
859 if (IS_SMC(pinfo))
860 cpm_uart_init_smc(pinfo);
861 else
862 cpm_uart_init_scc(pinfo);
863
864 return 0;
865 }
866
867 static void cpm_uart_release_port(struct uart_port *port)
868 {
869 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
870
871 if (!(pinfo->flags & FLAG_CONSOLE))
872 cpm_uart_freebuf(pinfo);
873 }
874
875 /*
876 * Configure/autoconfigure the port.
877 */
878 static void cpm_uart_config_port(struct uart_port *port, int flags)
879 {
880 pr_debug("CPM uart[%d]:config_port\n", port->line);
881
882 if (flags & UART_CONFIG_TYPE) {
883 port->type = PORT_CPM;
884 cpm_uart_request_port(port);
885 }
886 }
887 static struct uart_ops cpm_uart_pops = {
888 .tx_empty = cpm_uart_tx_empty,
889 .set_mctrl = cpm_uart_set_mctrl,
890 .get_mctrl = cpm_uart_get_mctrl,
891 .stop_tx = cpm_uart_stop_tx,
892 .start_tx = cpm_uart_start_tx,
893 .stop_rx = cpm_uart_stop_rx,
894 .enable_ms = cpm_uart_enable_ms,
895 .break_ctl = cpm_uart_break_ctl,
896 .startup = cpm_uart_startup,
897 .shutdown = cpm_uart_shutdown,
898 .set_termios = cpm_uart_set_termios,
899 .type = cpm_uart_type,
900 .release_port = cpm_uart_release_port,
901 .request_port = cpm_uart_request_port,
902 .config_port = cpm_uart_config_port,
903 .verify_port = cpm_uart_verify_port,
904 };
905
906 struct uart_cpm_port cpm_uart_ports[UART_NR] = {
907 [UART_SMC1] = {
908 .port = {
909 .irq = SMC1_IRQ,
910 .ops = &cpm_uart_pops,
911 .iotype = UPIO_MEM,
912 .lock = SPIN_LOCK_UNLOCKED,
913 },
914 .flags = FLAG_SMC,
915 .tx_nrfifos = TX_NUM_FIFO,
916 .tx_fifosize = TX_BUF_SIZE,
917 .rx_nrfifos = RX_NUM_FIFO,
918 .rx_fifosize = RX_BUF_SIZE,
919 .set_lineif = smc1_lineif,
920 },
921 [UART_SMC2] = {
922 .port = {
923 .irq = SMC2_IRQ,
924 .ops = &cpm_uart_pops,
925 .iotype = UPIO_MEM,
926 .lock = SPIN_LOCK_UNLOCKED,
927 },
928 .flags = FLAG_SMC,
929 .tx_nrfifos = TX_NUM_FIFO,
930 .tx_fifosize = TX_BUF_SIZE,
931 .rx_nrfifos = RX_NUM_FIFO,
932 .rx_fifosize = RX_BUF_SIZE,
933 .set_lineif = smc2_lineif,
934 #ifdef CONFIG_SERIAL_CPM_ALT_SMC2
935 .is_portb = 1,
936 #endif
937 },
938 [UART_SCC1] = {
939 .port = {
940 .irq = SCC1_IRQ,
941 .ops = &cpm_uart_pops,
942 .iotype = UPIO_MEM,
943 .lock = SPIN_LOCK_UNLOCKED,
944 },
945 .tx_nrfifos = TX_NUM_FIFO,
946 .tx_fifosize = TX_BUF_SIZE,
947 .rx_nrfifos = RX_NUM_FIFO,
948 .rx_fifosize = RX_BUF_SIZE,
949 .set_lineif = scc1_lineif,
950 .wait_closing = SCC_WAIT_CLOSING,
951 },
952 [UART_SCC2] = {
953 .port = {
954 .irq = SCC2_IRQ,
955 .ops = &cpm_uart_pops,
956 .iotype = UPIO_MEM,
957 .lock = SPIN_LOCK_UNLOCKED,
958 },
959 .tx_nrfifos = TX_NUM_FIFO,
960 .tx_fifosize = TX_BUF_SIZE,
961 .rx_nrfifos = RX_NUM_FIFO,
962 .rx_fifosize = RX_BUF_SIZE,
963 .set_lineif = scc2_lineif,
964 .wait_closing = SCC_WAIT_CLOSING,
965 },
966 [UART_SCC3] = {
967 .port = {
968 .irq = SCC3_IRQ,
969 .ops = &cpm_uart_pops,
970 .iotype = UPIO_MEM,
971 .lock = SPIN_LOCK_UNLOCKED,
972 },
973 .tx_nrfifos = TX_NUM_FIFO,
974 .tx_fifosize = TX_BUF_SIZE,
975 .rx_nrfifos = RX_NUM_FIFO,
976 .rx_fifosize = RX_BUF_SIZE,
977 .set_lineif = scc3_lineif,
978 .wait_closing = SCC_WAIT_CLOSING,
979 },
980 [UART_SCC4] = {
981 .port = {
982 .irq = SCC4_IRQ,
983 .ops = &cpm_uart_pops,
984 .iotype = UPIO_MEM,
985 .lock = SPIN_LOCK_UNLOCKED,
986 },
987 .tx_nrfifos = TX_NUM_FIFO,
988 .tx_fifosize = TX_BUF_SIZE,
989 .rx_nrfifos = RX_NUM_FIFO,
990 .rx_fifosize = RX_BUF_SIZE,
991 .set_lineif = scc4_lineif,
992 .wait_closing = SCC_WAIT_CLOSING,
993 },
994 };
995
996 #ifdef CONFIG_SERIAL_CPM_CONSOLE
997 /*
998 * Print a string to the serial port trying not to disturb
999 * any possible real use of the port...
1000 *
1001 * Note that this is called with interrupts already disabled
1002 */
1003 static void cpm_uart_console_write(struct console *co, const char *s,
1004 u_int count)
1005 {
1006 struct uart_cpm_port *pinfo =
1007 &cpm_uart_ports[cpm_uart_port_map[co->index]];
1008 unsigned int i;
1009 volatile cbd_t *bdp, *bdbase;
1010 volatile unsigned char *cp;
1011
1012 /* Get the address of the host memory buffer.
1013 */
1014 bdp = pinfo->tx_cur;
1015 bdbase = pinfo->tx_bd_base;
1016
1017 /*
1018 * Now, do each character. This is not as bad as it looks
1019 * since this is a holding FIFO and not a transmitting FIFO.
1020 * We could add the complexity of filling the entire transmit
1021 * buffer, but we would just wait longer between accesses......
1022 */
1023 for (i = 0; i < count; i++, s++) {
1024 /* Wait for transmitter fifo to empty.
1025 * Ready indicates output is ready, and xmt is doing
1026 * that, not that it is ready for us to send.
1027 */
1028 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1029 ;
1030
1031 /* Send the character out.
1032 * If the buffer address is in the CPM DPRAM, don't
1033 * convert it.
1034 */
1035 cp = cpm2cpu_addr(bdp->cbd_bufaddr);
1036
1037 *cp = *s;
1038
1039 bdp->cbd_datlen = 1;
1040 bdp->cbd_sc |= BD_SC_READY;
1041
1042 if (bdp->cbd_sc & BD_SC_WRAP)
1043 bdp = bdbase;
1044 else
1045 bdp++;
1046
1047 /* if a LF, also do CR... */
1048 if (*s == 10) {
1049 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1050 ;
1051
1052 cp = cpm2cpu_addr(bdp->cbd_bufaddr);
1053
1054 *cp = 13;
1055 bdp->cbd_datlen = 1;
1056 bdp->cbd_sc |= BD_SC_READY;
1057
1058 if (bdp->cbd_sc & BD_SC_WRAP)
1059 bdp = bdbase;
1060 else
1061 bdp++;
1062 }
1063 }
1064
1065 /*
1066 * Finally, Wait for transmitter & holding register to empty
1067 * and restore the IER
1068 */
1069 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1070 ;
1071
1072 pinfo->tx_cur = (volatile cbd_t *) bdp;
1073 }
1074
1075 /*
1076 * Setup console. Be careful is called early !
1077 */
1078 static int __init cpm_uart_console_setup(struct console *co, char *options)
1079 {
1080 struct uart_port *port;
1081 struct uart_cpm_port *pinfo;
1082 int baud = 38400;
1083 int bits = 8;
1084 int parity = 'n';
1085 int flow = 'n';
1086 int ret;
1087
1088 port =
1089 (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]];
1090 pinfo = (struct uart_cpm_port *)port;
1091
1092 pinfo->flags |= FLAG_CONSOLE;
1093
1094 if (options) {
1095 uart_parse_options(options, &baud, &parity, &bits, &flow);
1096 } else {
1097 bd_t *bd = (bd_t *) __res;
1098
1099 if (bd->bi_baudrate)
1100 baud = bd->bi_baudrate;
1101 else
1102 baud = 9600;
1103 }
1104
1105 /*
1106 * Setup any port IO, connect any baud rate generators,
1107 * etc. This is expected to be handled by board
1108 * dependant code
1109 */
1110 if (pinfo->set_lineif)
1111 pinfo->set_lineif(pinfo);
1112
1113 if (IS_SMC(pinfo)) {
1114 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
1115 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
1116 } else {
1117 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
1118 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1119 }
1120
1121 ret = cpm_uart_allocbuf(pinfo, 1);
1122
1123 if (ret)
1124 return ret;
1125
1126 cpm_uart_initbd(pinfo);
1127
1128 if (IS_SMC(pinfo))
1129 cpm_uart_init_smc(pinfo);
1130 else
1131 cpm_uart_init_scc(pinfo);
1132
1133 uart_set_options(port, co, baud, parity, bits, flow);
1134
1135 return 0;
1136 }
1137
1138 static struct uart_driver cpm_reg;
1139 static struct console cpm_scc_uart_console = {
1140 .name = "ttyCPM",
1141 .write = cpm_uart_console_write,
1142 .device = uart_console_device,
1143 .setup = cpm_uart_console_setup,
1144 .flags = CON_PRINTBUFFER,
1145 .index = -1,
1146 .data = &cpm_reg,
1147 };
1148
1149 int __init cpm_uart_console_init(void)
1150 {
1151 int ret = cpm_uart_init_portdesc();
1152
1153 if (!ret)
1154 register_console(&cpm_scc_uart_console);
1155 return ret;
1156 }
1157
1158 console_initcall(cpm_uart_console_init);
1159
1160 #define CPM_UART_CONSOLE &cpm_scc_uart_console
1161 #else
1162 #define CPM_UART_CONSOLE NULL
1163 #endif
1164
1165 static struct uart_driver cpm_reg = {
1166 .owner = THIS_MODULE,
1167 .driver_name = "ttyCPM",
1168 .dev_name = "ttyCPM",
1169 .major = SERIAL_CPM_MAJOR,
1170 .minor = SERIAL_CPM_MINOR,
1171 .cons = CPM_UART_CONSOLE,
1172 };
1173
1174 static int __init cpm_uart_init(void)
1175 {
1176 int ret, i;
1177
1178 printk(KERN_INFO "Serial: CPM driver $Revision: 0.01 $\n");
1179
1180 #ifndef CONFIG_SERIAL_CPM_CONSOLE
1181 ret = cpm_uart_init_portdesc();
1182 if (ret)
1183 return ret;
1184 #endif
1185
1186 cpm_reg.nr = cpm_uart_nr;
1187 ret = uart_register_driver(&cpm_reg);
1188
1189 if (ret)
1190 return ret;
1191
1192 for (i = 0; i < cpm_uart_nr; i++) {
1193 int con = cpm_uart_port_map[i];
1194 cpm_uart_ports[con].port.line = i;
1195 cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF;
1196 uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1197 }
1198
1199 return ret;
1200 }
1201
1202 static void __exit cpm_uart_exit(void)
1203 {
1204 int i;
1205
1206 for (i = 0; i < cpm_uart_nr; i++) {
1207 int con = cpm_uart_port_map[i];
1208 uart_remove_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1209 }
1210
1211 uart_unregister_driver(&cpm_reg);
1212 }
1213
1214 module_init(cpm_uart_init);
1215 module_exit(cpm_uart_exit);
1216
1217 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1218 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1219 MODULE_LICENSE("GPL");
1220 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);
Linux kernel - Deliverables
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