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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / cpm_uart / cpm_uart_core.c
blob29db677d4284dd5455a720acfe3a9d077bab4d40
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 (kumar.gala@freescale.com) (CPM2)
11 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
12 *
13 * Copyright (C) 2004 Freescale Semiconductor, Inc.
14 * (C) 2004 Intracom, S.A.
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/tty.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/serial.h>
38 #include <linux/console.h>
39 #include <linux/sysrq.h>
40 #include <linux/device.h>
41 #include <linux/bootmem.h>
42 #include <linux/dma-mapping.h>
43
44 #include <asm/io.h>
45 #include <asm/irq.h>
46 #include <asm/delay.h>
47
48 #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
49 #define SUPPORT_SYSRQ
50 #endif
51
52 #include <linux/serial_core.h>
53 #include <linux/kernel.h>
54
55 #include "cpm_uart.h"
56
57 /***********************************************************************/
58
59 /* Track which ports are configured as uarts */
60 int cpm_uart_port_map[UART_NR];
61 /* How many ports did we config as uarts */
62 int cpm_uart_nr;
63
64 /**************************************************************/
65
66 static int cpm_uart_tx_pump(struct uart_port *port);
67 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo);
68 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo);
69 static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
70
71 /**************************************************************/
72
73 /*
74 * Check, if transmit buffers are processed
75 */
76 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
77 {
78 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
79 volatile cbd_t *bdp = pinfo->tx_bd_base;
80 int ret = 0;
81
82 while (1) {
83 if (bdp->cbd_sc & BD_SC_READY)
84 break;
85
86 if (bdp->cbd_sc & BD_SC_WRAP) {
87 ret = TIOCSER_TEMT;
88 break;
89 }
90 bdp++;
91 }
92
93 pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
94
95 return ret;
96 }
97
98 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
99 {
100 /* Whee. Do nothing. */
101 }
102
103 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
104 {
105 /* Whee. Do nothing. */
106 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
107 }
108
109 /*
110 * Stop transmitter
111 */
112 static void cpm_uart_stop_tx(struct uart_port *port, unsigned int tty_stop)
113 {
114 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
115 volatile smc_t *smcp = pinfo->smcp;
116 volatile scc_t *sccp = pinfo->sccp;
117
118 pr_debug("CPM uart[%d]:stop tx\n", port->line);
119
120 if (IS_SMC(pinfo))
121 smcp->smc_smcm &= ~SMCM_TX;
122 else
123 sccp->scc_sccm &= ~UART_SCCM_TX;
124 }
125
126 /*
127 * Start transmitter
128 */
129 static void cpm_uart_start_tx(struct uart_port *port, unsigned int tty_start)
130 {
131 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
132 volatile smc_t *smcp = pinfo->smcp;
133 volatile scc_t *sccp = pinfo->sccp;
134
135 pr_debug("CPM uart[%d]:start tx\n", port->line);
136
137 if (IS_SMC(pinfo)) {
138 if (smcp->smc_smcm & SMCM_TX)
139 return;
140 } else {
141 if (sccp->scc_sccm & UART_SCCM_TX)
142 return;
143 }
144
145 if (cpm_uart_tx_pump(port) != 0) {
146 if (IS_SMC(pinfo))
147 smcp->smc_smcm |= SMCM_TX;
148 else
149 sccp->scc_sccm |= UART_SCCM_TX;
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 volatile smc_t *smcp = pinfo->smcp;
160 volatile scc_t *sccp = pinfo->sccp;
161
162 pr_debug("CPM uart[%d]:stop rx\n", port->line);
163
164 if (IS_SMC(pinfo))
165 smcp->smc_smcm &= ~SMCM_RX;
166 else
167 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 int line = pinfo - cpm_uart_ports;
185
186 pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
187 break_state);
188
189 if (break_state)
190 cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
191 else
192 cpm_line_cr_cmd(line, CPM_CR_RESTART_TX);
193 }
194
195 /*
196 * Transmit characters, refill buffer descriptor, if possible
197 */
198 static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs)
199 {
200 pr_debug("CPM uart[%d]:TX INT\n", port->line);
201
202 cpm_uart_tx_pump(port);
203 }
204
205 /*
206 * Receive characters
207 */
208 static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
209 {
210 int i;
211 unsigned char ch, *cp;
212 struct tty_struct *tty = port->info->tty;
213 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
214 volatile cbd_t *bdp;
215 u16 status;
216 unsigned int flg;
217
218 pr_debug("CPM uart[%d]:RX INT\n", port->line);
219
220 /* Just loop through the closed BDs and copy the characters into
221 * the buffer.
222 */
223 bdp = pinfo->rx_cur;
224 for (;;) {
225 /* get status */
226 status = bdp->cbd_sc;
227 /* If this one is empty, return happy */
228 if (status & BD_SC_EMPTY)
229 break;
230
231 /* get number of characters, and check spce in flip-buffer */
232 i = bdp->cbd_datlen;
233
234 /* If we have not enough room in tty flip buffer, then we try
235 * later, which will be the next rx-interrupt or a timeout
236 */
237 if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) {
238 tty->flip.work.func((void *)tty);
239 if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) {
240 printk(KERN_WARNING "TTY_DONT_FLIP set\n");
241 return;
242 }
243 }
244
245 /* get pointer */
246 cp = (unsigned char *)bus_to_virt(bdp->cbd_bufaddr);
247
248 /* loop through the buffer */
249 while (i-- > 0) {
250 ch = *cp++;
251 port->icount.rx++;
252 flg = TTY_NORMAL;
253
254 if (status &
255 (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
256 goto handle_error;
257 if (uart_handle_sysrq_char(port, ch, regs))
258 continue;
259
260 error_return:
261 *tty->flip.char_buf_ptr++ = ch;
262 *tty->flip.flag_buf_ptr++ = flg;
263 tty->flip.count++;
264
265 } /* End while (i--) */
266
267 /* This BD is ready to be used again. Clear status. get next */
268 bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
269 bdp->cbd_sc |= BD_SC_EMPTY;
270
271 if (bdp->cbd_sc & BD_SC_WRAP)
272 bdp = pinfo->rx_bd_base;
273 else
274 bdp++;
275 } /* End for (;;) */
276
277 /* Write back buffer pointer */
278 pinfo->rx_cur = (volatile cbd_t *) bdp;
279
280 /* activate BH processing */
281 tty_flip_buffer_push(tty);
282
283 return;
284
285 /* Error processing */
286
287 handle_error:
288 /* Statistics */
289 if (status & BD_SC_BR)
290 port->icount.brk++;
291 if (status & BD_SC_PR)
292 port->icount.parity++;
293 if (status & BD_SC_FR)
294 port->icount.frame++;
295 if (status & BD_SC_OV)
296 port->icount.overrun++;
297
298 /* Mask out ignored conditions */
299 status &= port->read_status_mask;
300
301 /* Handle the remaining ones */
302 if (status & BD_SC_BR)
303 flg = TTY_BREAK;
304 else if (status & BD_SC_PR)
305 flg = TTY_PARITY;
306 else if (status & BD_SC_FR)
307 flg = TTY_FRAME;
308
309 /* overrun does not affect the current character ! */
310 if (status & BD_SC_OV) {
311 ch = 0;
312 flg = TTY_OVERRUN;
313 /* We skip this buffer */
314 /* CHECK: Is really nothing senseful there */
315 /* ASSUMPTION: it contains nothing valid */
316 i = 0;
317 }
318 #ifdef SUPPORT_SYSRQ
319 port->sysrq = 0;
320 #endif
321 goto error_return;
322 }
323
324 /*
325 * Asynchron mode interrupt handler
326 */
327 static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs)
328 {
329 u8 events;
330 struct uart_port *port = (struct uart_port *)data;
331 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
332 volatile smc_t *smcp = pinfo->smcp;
333 volatile scc_t *sccp = pinfo->sccp;
334
335 pr_debug("CPM uart[%d]:IRQ\n", port->line);
336
337 if (IS_SMC(pinfo)) {
338 events = smcp->smc_smce;
339 if (events & SMCM_BRKE)
340 uart_handle_break(port);
341 if (events & SMCM_RX)
342 cpm_uart_int_rx(port, regs);
343 if (events & SMCM_TX)
344 cpm_uart_int_tx(port, regs);
345 smcp->smc_smce = events;
346 } else {
347 events = sccp->scc_scce;
348 if (events & UART_SCCM_BRKE)
349 uart_handle_break(port);
350 if (events & UART_SCCM_RX)
351 cpm_uart_int_rx(port, regs);
352 if (events & UART_SCCM_TX)
353 cpm_uart_int_tx(port, regs);
354 sccp->scc_scce = events;
355 }
356 return (events) ? IRQ_HANDLED : IRQ_NONE;
357 }
358
359 static int cpm_uart_startup(struct uart_port *port)
360 {
361 int retval;
362 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
363
364 pr_debug("CPM uart[%d]:startup\n", port->line);
365
366 /* Install interrupt handler. */
367 retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
368 if (retval)
369 return retval;
370
371 /* Startup rx-int */
372 if (IS_SMC(pinfo)) {
373 pinfo->smcp->smc_smcm |= SMCM_RX;
374 pinfo->smcp->smc_smcmr |= SMCMR_REN;
375 } else {
376 pinfo->sccp->scc_sccm |= UART_SCCM_RX;
377 }
378
379 return 0;
380 }
381
382 /*
383 * Shutdown the uart
384 */
385 static void cpm_uart_shutdown(struct uart_port *port)
386 {
387 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
388 int line = pinfo - cpm_uart_ports;
389
390 pr_debug("CPM uart[%d]:shutdown\n", port->line);
391
392 /* free interrupt handler */
393 free_irq(port->irq, port);
394
395 /* If the port is not the console, disable Rx and Tx. */
396 if (!(pinfo->flags & FLAG_CONSOLE)) {
397 /* Stop uarts */
398 if (IS_SMC(pinfo)) {
399 volatile smc_t *smcp = pinfo->smcp;
400 smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
401 smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
402 } else {
403 volatile scc_t *sccp = pinfo->sccp;
404 sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
405 sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
406 }
407
408 /* Shut them really down and reinit buffer descriptors */
409 cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
410 cpm_uart_initbd(pinfo);
411 }
412 }
413
414 static void cpm_uart_set_termios(struct uart_port *port,
415 struct termios *termios, struct termios *old)
416 {
417 int baud;
418 unsigned long flags;
419 u16 cval, scval, prev_mode;
420 int bits, sbits;
421 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
422 volatile smc_t *smcp = pinfo->smcp;
423 volatile scc_t *sccp = pinfo->sccp;
424
425 pr_debug("CPM uart[%d]:set_termios\n", port->line);
426
427 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
428
429 /* Character length programmed into the mode register is the
430 * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
431 * 1 or 2 stop bits, minus 1.
432 * The value 'bits' counts this for us.
433 */
434 cval = 0;
435 scval = 0;
436
437 /* byte size */
438 switch (termios->c_cflag & CSIZE) {
439 case CS5:
440 bits = 5;
441 break;
442 case CS6:
443 bits = 6;
444 break;
445 case CS7:
446 bits = 7;
447 break;
448 case CS8:
449 bits = 8;
450 break;
451 /* Never happens, but GCC is too dumb to figure it out */
452 default:
453 bits = 8;
454 break;
455 }
456 sbits = bits - 5;
457
458 if (termios->c_cflag & CSTOPB) {
459 cval |= SMCMR_SL; /* Two stops */
460 scval |= SCU_PSMR_SL;
461 bits++;
462 }
463
464 if (termios->c_cflag & PARENB) {
465 cval |= SMCMR_PEN;
466 scval |= SCU_PSMR_PEN;
467 bits++;
468 if (!(termios->c_cflag & PARODD)) {
469 cval |= SMCMR_PM_EVEN;
470 scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
471 }
472 }
473
474 /*
475 * Set up parity check flag
476 */
477 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
478
479 port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
480 if (termios->c_iflag & INPCK)
481 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
482 if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
483 port->read_status_mask |= BD_SC_BR;
484
485 /*
486 * Characters to ignore
487 */
488 port->ignore_status_mask = 0;
489 if (termios->c_iflag & IGNPAR)
490 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
491 if (termios->c_iflag & IGNBRK) {
492 port->ignore_status_mask |= BD_SC_BR;
493 /*
494 * If we're ignore parity and break indicators, ignore
495 * overruns too. (For real raw support).
496 */
497 if (termios->c_iflag & IGNPAR)
498 port->ignore_status_mask |= BD_SC_OV;
499 }
500 /*
501 * !!! ignore all characters if CREAD is not set
502 */
503 if ((termios->c_cflag & CREAD) == 0)
504 port->read_status_mask &= ~BD_SC_EMPTY;
505
506 spin_lock_irqsave(&port->lock, flags);
507
508 /* Start bit has not been added (so don't, because we would just
509 * subtract it later), and we need to add one for the number of
510 * stops bits (there is always at least one).
511 */
512 bits++;
513 if (IS_SMC(pinfo)) {
514 /* Set the mode register. We want to keep a copy of the
515 * enables, because we want to put them back if they were
516 * present.
517 */
518 prev_mode = smcp->smc_smcmr;
519 smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART;
520 smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
521 } else {
522 sccp->scc_psmr = (sbits << 12) | scval;
523 }
524
525 cpm_set_brg(pinfo->brg - 1, baud);
526 spin_unlock_irqrestore(&port->lock, flags);
527
528 }
529
530 static const char *cpm_uart_type(struct uart_port *port)
531 {
532 pr_debug("CPM uart[%d]:uart_type\n", port->line);
533
534 return port->type == PORT_CPM ? "CPM UART" : NULL;
535 }
536
537 /*
538 * verify the new serial_struct (for TIOCSSERIAL).
539 */
540 static int cpm_uart_verify_port(struct uart_port *port,
541 struct serial_struct *ser)
542 {
543 int ret = 0;
544
545 pr_debug("CPM uart[%d]:verify_port\n", port->line);
546
547 if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
548 ret = -EINVAL;
549 if (ser->irq < 0 || ser->irq >= NR_IRQS)
550 ret = -EINVAL;
551 if (ser->baud_base < 9600)
552 ret = -EINVAL;
553 return ret;
554 }
555
556 /*
557 * Transmit characters, refill buffer descriptor, if possible
558 */
559 static int cpm_uart_tx_pump(struct uart_port *port)
560 {
561 volatile cbd_t *bdp;
562 unsigned char *p;
563 int count;
564 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
565 struct circ_buf *xmit = &port->info->xmit;
566
567 /* Handle xon/xoff */
568 if (port->x_char) {
569 /* Pick next descriptor and fill from buffer */
570 bdp = pinfo->tx_cur;
571
572 p = bus_to_virt(bdp->cbd_bufaddr);
573 *p++ = xmit->buf[xmit->tail];
574 bdp->cbd_datlen = 1;
575 bdp->cbd_sc |= BD_SC_READY;
576 /* Get next BD. */
577 if (bdp->cbd_sc & BD_SC_WRAP)
578 bdp = pinfo->tx_bd_base;
579 else
580 bdp++;
581 pinfo->tx_cur = bdp;
582
583 port->icount.tx++;
584 port->x_char = 0;
585 return 1;
586 }
587
588 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
589 cpm_uart_stop_tx(port, 0);
590 return 0;
591 }
592
593 /* Pick next descriptor and fill from buffer */
594 bdp = pinfo->tx_cur;
595
596 while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
597 count = 0;
598 p = bus_to_virt(bdp->cbd_bufaddr);
599 while (count < pinfo->tx_fifosize) {
600 *p++ = xmit->buf[xmit->tail];
601 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
602 port->icount.tx++;
603 count++;
604 if (xmit->head == xmit->tail)
605 break;
606 }
607 bdp->cbd_datlen = count;
608 bdp->cbd_sc |= BD_SC_READY;
609 /* Get next BD. */
610 if (bdp->cbd_sc & BD_SC_WRAP)
611 bdp = pinfo->tx_bd_base;
612 else
613 bdp++;
614 }
615 pinfo->tx_cur = bdp;
616
617 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
618 uart_write_wakeup(port);
619
620 if (uart_circ_empty(xmit)) {
621 cpm_uart_stop_tx(port, 0);
622 return 0;
623 }
624
625 return 1;
626 }
627
628 /*
629 * init buffer descriptors
630 */
631 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
632 {
633 int i;
634 u8 *mem_addr;
635 volatile cbd_t *bdp;
636
637 pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
638
639 /* Set the physical address of the host memory
640 * buffers in the buffer descriptors, and the
641 * virtual address for us to work with.
642 */
643 mem_addr = pinfo->mem_addr;
644 bdp = pinfo->rx_cur = pinfo->rx_bd_base;
645 for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
646 bdp->cbd_bufaddr = virt_to_bus(mem_addr);
647 bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
648 mem_addr += pinfo->rx_fifosize;
649 }
650
651 bdp->cbd_bufaddr = virt_to_bus(mem_addr);
652 bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
653
654 /* Set the physical address of the host memory
655 * buffers in the buffer descriptors, and the
656 * virtual address for us to work with.
657 */
658 mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
659 bdp = pinfo->tx_cur = pinfo->tx_bd_base;
660 for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
661 bdp->cbd_bufaddr = virt_to_bus(mem_addr);
662 bdp->cbd_sc = BD_SC_INTRPT;
663 mem_addr += pinfo->tx_fifosize;
664 }
665
666 bdp->cbd_bufaddr = virt_to_bus(mem_addr);
667 bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
668 }
669
670 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
671 {
672 int line = pinfo - cpm_uart_ports;
673 volatile scc_t *scp;
674 volatile scc_uart_t *sup;
675
676 pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
677
678 scp = pinfo->sccp;
679 sup = pinfo->sccup;
680
681 /* Store address */
682 pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE;
683 pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE;
684
685 /* Set up the uart parameters in the
686 * parameter ram.
687 */
688
689 cpm_set_scc_fcr(sup);
690
691 sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize;
692 sup->scc_maxidl = pinfo->rx_fifosize;
693 sup->scc_brkcr = 1;
694 sup->scc_parec = 0;
695 sup->scc_frmec = 0;
696 sup->scc_nosec = 0;
697 sup->scc_brkec = 0;
698 sup->scc_uaddr1 = 0;
699 sup->scc_uaddr2 = 0;
700 sup->scc_toseq = 0;
701 sup->scc_char1 = 0x8000;
702 sup->scc_char2 = 0x8000;
703 sup->scc_char3 = 0x8000;
704 sup->scc_char4 = 0x8000;
705 sup->scc_char5 = 0x8000;
706 sup->scc_char6 = 0x8000;
707 sup->scc_char7 = 0x8000;
708 sup->scc_char8 = 0x8000;
709 sup->scc_rccm = 0xc0ff;
710
711 /* Send the CPM an initialize command.
712 */
713 cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
714
715 /* Set UART mode, 8 bit, no parity, one stop.
716 * Enable receive and transmit.
717 */
718 scp->scc_gsmrh = 0;
719 scp->scc_gsmrl =
720 (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
721
722 /* Enable rx interrupts and clear all pending events. */
723 scp->scc_sccm = 0;
724 scp->scc_scce = 0xffff;
725 scp->scc_dsr = 0x7e7e;
726 scp->scc_psmr = 0x3000;
727
728 scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
729 }
730
731 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
732 {
733 int line = pinfo - cpm_uart_ports;
734 volatile smc_t *sp;
735 volatile smc_uart_t *up;
736
737 pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
738
739 sp = pinfo->smcp;
740 up = pinfo->smcup;
741
742 /* Store address */
743 pinfo->smcup->smc_rbase = (u_char *)pinfo->rx_bd_base - DPRAM_BASE;
744 pinfo->smcup->smc_tbase = (u_char *)pinfo->tx_bd_base - DPRAM_BASE;
745
746 /*
747 * In case SMC1 is being relocated...
748 */
749 #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
750 up->smc_rbptr = pinfo->smcup->smc_rbase;
751 up->smc_tbptr = pinfo->smcup->smc_tbase;
752 up->smc_rstate = 0;
753 up->smc_tstate = 0;
754 up->smc_brkcr = 1; /* number of break chars */
755 up->smc_brkec = 0;
756 #endif
757
758 /* Set up the uart parameters in the
759 * parameter ram.
760 */
761 cpm_set_smc_fcr(up);
762
763 /* Using idle charater time requires some additional tuning. */
764 up->smc_mrblr = pinfo->rx_fifosize;
765 up->smc_maxidl = pinfo->rx_fifosize;
766 up->smc_brkcr = 1;
767
768 cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
769
770 /* Set UART mode, 8 bit, no parity, one stop.
771 * Enable receive and transmit.
772 */
773 sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
774
775 /* Enable only rx interrupts clear all pending events. */
776 sp->smc_smcm = 0;
777 sp->smc_smce = 0xff;
778
779 sp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
780 }
781
782 /*
783 * Initialize port. This is called from early_console stuff
784 * so we have to be careful here !
785 */
786 static int cpm_uart_request_port(struct uart_port *port)
787 {
788 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
789 int ret;
790
791 pr_debug("CPM uart[%d]:request port\n", port->line);
792
793 if (pinfo->flags & FLAG_CONSOLE)
794 return 0;
795
796 /*
797 * Setup any port IO, connect any baud rate generators,
798 * etc. This is expected to be handled by board
799 * dependant code
800 */
801 if (pinfo->set_lineif)
802 pinfo->set_lineif(pinfo);
803
804 if (IS_SMC(pinfo)) {
805 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
806 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
807 } else {
808 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
809 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
810 }
811
812 ret = cpm_uart_allocbuf(pinfo, 0);
813
814 if (ret)
815 return ret;
816
817 cpm_uart_initbd(pinfo);
818
819 return 0;
820 }
821
822 static void cpm_uart_release_port(struct uart_port *port)
823 {
824 struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
825
826 if (!(pinfo->flags & FLAG_CONSOLE))
827 cpm_uart_freebuf(pinfo);
828 }
829
830 /*
831 * Configure/autoconfigure the port.
832 */
833 static void cpm_uart_config_port(struct uart_port *port, int flags)
834 {
835 pr_debug("CPM uart[%d]:config_port\n", port->line);
836
837 if (flags & UART_CONFIG_TYPE) {
838 port->type = PORT_CPM;
839 cpm_uart_request_port(port);
840 }
841 }
842 static struct uart_ops cpm_uart_pops = {
843 .tx_empty = cpm_uart_tx_empty,
844 .set_mctrl = cpm_uart_set_mctrl,
845 .get_mctrl = cpm_uart_get_mctrl,
846 .stop_tx = cpm_uart_stop_tx,
847 .start_tx = cpm_uart_start_tx,
848 .stop_rx = cpm_uart_stop_rx,
849 .enable_ms = cpm_uart_enable_ms,
850 .break_ctl = cpm_uart_break_ctl,
851 .startup = cpm_uart_startup,
852 .shutdown = cpm_uart_shutdown,
853 .set_termios = cpm_uart_set_termios,
854 .type = cpm_uart_type,
855 .release_port = cpm_uart_release_port,
856 .request_port = cpm_uart_request_port,
857 .config_port = cpm_uart_config_port,
858 .verify_port = cpm_uart_verify_port,
859 };
860
861 struct uart_cpm_port cpm_uart_ports[UART_NR] = {
862 [UART_SMC1] = {
863 .port = {
864 .irq = SMC1_IRQ,
865 .ops = &cpm_uart_pops,
866 .iotype = SERIAL_IO_MEM,
867 .lock = SPIN_LOCK_UNLOCKED,
868 },
869 .flags = FLAG_SMC,
870 .tx_nrfifos = TX_NUM_FIFO,
871 .tx_fifosize = TX_BUF_SIZE,
872 .rx_nrfifos = RX_NUM_FIFO,
873 .rx_fifosize = RX_BUF_SIZE,
874 .set_lineif = smc1_lineif,
875 },
876 [UART_SMC2] = {
877 .port = {
878 .irq = SMC2_IRQ,
879 .ops = &cpm_uart_pops,
880 .iotype = SERIAL_IO_MEM,
881 .lock = SPIN_LOCK_UNLOCKED,
882 },
883 .flags = FLAG_SMC,
884 .tx_nrfifos = TX_NUM_FIFO,
885 .tx_fifosize = TX_BUF_SIZE,
886 .rx_nrfifos = RX_NUM_FIFO,
887 .rx_fifosize = RX_BUF_SIZE,
888 .set_lineif = smc2_lineif,
889 #ifdef CONFIG_SERIAL_CPM_ALT_SMC2
890 .is_portb = 1,
891 #endif
892 },
893 [UART_SCC1] = {
894 .port = {
895 .irq = SCC1_IRQ,
896 .ops = &cpm_uart_pops,
897 .iotype = SERIAL_IO_MEM,
898 .lock = SPIN_LOCK_UNLOCKED,
899 },
900 .tx_nrfifos = TX_NUM_FIFO,
901 .tx_fifosize = TX_BUF_SIZE,
902 .rx_nrfifos = RX_NUM_FIFO,
903 .rx_fifosize = RX_BUF_SIZE,
904 .set_lineif = scc1_lineif,
905 },
906 [UART_SCC2] = {
907 .port = {
908 .irq = SCC2_IRQ,
909 .ops = &cpm_uart_pops,
910 .iotype = SERIAL_IO_MEM,
911 .lock = SPIN_LOCK_UNLOCKED,
912 },
913 .tx_nrfifos = TX_NUM_FIFO,
914 .tx_fifosize = TX_BUF_SIZE,
915 .rx_nrfifos = RX_NUM_FIFO,
916 .rx_fifosize = RX_BUF_SIZE,
917 .set_lineif = scc2_lineif,
918 },
919 [UART_SCC3] = {
920 .port = {
921 .irq = SCC3_IRQ,
922 .ops = &cpm_uart_pops,
923 .iotype = SERIAL_IO_MEM,
924 .lock = SPIN_LOCK_UNLOCKED,
925 },
926 .tx_nrfifos = TX_NUM_FIFO,
927 .tx_fifosize = TX_BUF_SIZE,
928 .rx_nrfifos = RX_NUM_FIFO,
929 .rx_fifosize = RX_BUF_SIZE,
930 .set_lineif = scc3_lineif,
931 },
932 [UART_SCC4] = {
933 .port = {
934 .irq = SCC4_IRQ,
935 .ops = &cpm_uart_pops,
936 .iotype = SERIAL_IO_MEM,
937 .lock = SPIN_LOCK_UNLOCKED,
938 },
939 .tx_nrfifos = TX_NUM_FIFO,
940 .tx_fifosize = TX_BUF_SIZE,
941 .rx_nrfifos = RX_NUM_FIFO,
942 .rx_fifosize = RX_BUF_SIZE,
943 .set_lineif = scc4_lineif,
944 },
945 };
946
947 #ifdef CONFIG_SERIAL_CPM_CONSOLE
948 /*
949 * Print a string to the serial port trying not to disturb
950 * any possible real use of the port...
951 *
952 * Note that this is called with interrupts already disabled
953 */
954 static void cpm_uart_console_write(struct console *co, const char *s,
955 u_int count)
956 {
957 struct uart_cpm_port *pinfo =
958 &cpm_uart_ports[cpm_uart_port_map[co->index]];
959 unsigned int i;
960 volatile cbd_t *bdp, *bdbase;
961 volatile unsigned char *cp;
962
963 /* Get the address of the host memory buffer.
964 */
965 bdp = pinfo->tx_cur;
966 bdbase = pinfo->tx_bd_base;
967
968 /*
969 * Now, do each character. This is not as bad as it looks
970 * since this is a holding FIFO and not a transmitting FIFO.
971 * We could add the complexity of filling the entire transmit
972 * buffer, but we would just wait longer between accesses......
973 */
974 for (i = 0; i < count; i++, s++) {
975 /* Wait for transmitter fifo to empty.
976 * Ready indicates output is ready, and xmt is doing
977 * that, not that it is ready for us to send.
978 */
979 while ((bdp->cbd_sc & BD_SC_READY) != 0)
980 ;
981
982 /* Send the character out.
983 * If the buffer address is in the CPM DPRAM, don't
984 * convert it.
985 */
986 if ((uint) (bdp->cbd_bufaddr) > (uint) CPM_ADDR)
987 cp = (unsigned char *) (bdp->cbd_bufaddr);
988 else
989 cp = bus_to_virt(bdp->cbd_bufaddr);
990
991 *cp = *s;
992
993 bdp->cbd_datlen = 1;
994 bdp->cbd_sc |= BD_SC_READY;
995
996 if (bdp->cbd_sc & BD_SC_WRAP)
997 bdp = bdbase;
998 else
999 bdp++;
1000
1001 /* if a LF, also do CR... */
1002 if (*s == 10) {
1003 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1004 ;
1005
1006 if ((uint) (bdp->cbd_bufaddr) > (uint) CPM_ADDR)
1007 cp = (unsigned char *) (bdp->cbd_bufaddr);
1008 else
1009 cp = bus_to_virt(bdp->cbd_bufaddr);
1010
1011 *cp = 13;
1012 bdp->cbd_datlen = 1;
1013 bdp->cbd_sc |= BD_SC_READY;
1014
1015 if (bdp->cbd_sc & BD_SC_WRAP)
1016 bdp = bdbase;
1017 else
1018 bdp++;
1019 }
1020 }
1021
1022 /*
1023 * Finally, Wait for transmitter & holding register to empty
1024 * and restore the IER
1025 */
1026 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1027 ;
1028
1029 pinfo->tx_cur = (volatile cbd_t *) bdp;
1030 }
1031
1032 /*
1033 * Setup console. Be careful is called early !
1034 */
1035 static int __init cpm_uart_console_setup(struct console *co, char *options)
1036 {
1037 struct uart_port *port;
1038 struct uart_cpm_port *pinfo;
1039 int baud = 38400;
1040 int bits = 8;
1041 int parity = 'n';
1042 int flow = 'n';
1043 int ret;
1044
1045 port =
1046 (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]];
1047 pinfo = (struct uart_cpm_port *)port;
1048
1049 pinfo->flags |= FLAG_CONSOLE;
1050
1051 if (options) {
1052 uart_parse_options(options, &baud, &parity, &bits, &flow);
1053 } else {
1054 bd_t *bd = (bd_t *) __res;
1055
1056 if (bd->bi_baudrate)
1057 baud = bd->bi_baudrate;
1058 else
1059 baud = 9600;
1060 }
1061
1062 /*
1063 * Setup any port IO, connect any baud rate generators,
1064 * etc. This is expected to be handled by board
1065 * dependant code
1066 */
1067 if (pinfo->set_lineif)
1068 pinfo->set_lineif(pinfo);
1069
1070 if (IS_SMC(pinfo)) {
1071 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
1072 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
1073 } else {
1074 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
1075 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1076 }
1077
1078 ret = cpm_uart_allocbuf(pinfo, 1);
1079
1080 if (ret)
1081 return ret;
1082
1083 cpm_uart_initbd(pinfo);
1084
1085 if (IS_SMC(pinfo))
1086 cpm_uart_init_smc(pinfo);
1087 else
1088 cpm_uart_init_scc(pinfo);
1089
1090 uart_set_options(port, co, baud, parity, bits, flow);
1091
1092 return 0;
1093 }
1094
1095 extern struct uart_driver cpm_reg;
1096 static struct console cpm_scc_uart_console = {
1097 .name "ttyCPM",
1098 .write cpm_uart_console_write,
1099 .device uart_console_device,
1100 .setup cpm_uart_console_setup,
1101 .flags CON_PRINTBUFFER,
1102 .index -1,
1103 .data = &cpm_reg,
1104 };
1105
1106 int __init cpm_uart_console_init(void)
1107 {
1108 int ret = cpm_uart_init_portdesc();
1109
1110 if (!ret)
1111 register_console(&cpm_scc_uart_console);
1112 return ret;
1113 }
1114
1115 console_initcall(cpm_uart_console_init);
1116
1117 #define CPM_UART_CONSOLE &cpm_scc_uart_console
1118 #else
1119 #define CPM_UART_CONSOLE NULL
1120 #endif
1121
1122 static struct uart_driver cpm_reg = {
1123 .owner = THIS_MODULE,
1124 .driver_name = "ttyCPM",
1125 .dev_name = "ttyCPM",
1126 .major = SERIAL_CPM_MAJOR,
1127 .minor = SERIAL_CPM_MINOR,
1128 .cons = CPM_UART_CONSOLE,
1129 };
1130
1131 static int __init cpm_uart_init(void)
1132 {
1133 int ret, i;
1134
1135 printk(KERN_INFO "Serial: CPM driver $Revision: 0.01 $\n");
1136
1137 #ifndef CONFIG_SERIAL_CPM_CONSOLE
1138 ret = cpm_uart_init_portdesc();
1139 if (ret)
1140 return ret;
1141 #endif
1142
1143 cpm_reg.nr = cpm_uart_nr;
1144 ret = uart_register_driver(&cpm_reg);
1145
1146 if (ret)
1147 return ret;
1148
1149 for (i = 0; i < cpm_uart_nr; i++) {
1150 int con = cpm_uart_port_map[i];
1151 cpm_uart_ports[con].port.line = i;
1152 cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF;
1153 uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1154 }
1155
1156 return ret;
1157 }
1158
1159 static void __exit cpm_uart_exit(void)
1160 {
1161 int i;
1162
1163 for (i = 0; i < cpm_uart_nr; i++) {
1164 int con = cpm_uart_port_map[i];
1165 uart_remove_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1166 }
1167
1168 uart_unregister_driver(&cpm_reg);
1169 }
1170
1171 module_init(cpm_uart_init);
1172 module_exit(cpm_uart_exit);
1173
1174 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1175 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1176 MODULE_LICENSE("GPL");
1177 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree