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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / char / vme_scc.c
blobe01317cb1a0e08d4799582f5d7ecbad49765ef22
1 /*
2 * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
3 * implementation.
4 * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
5 *
6 * Based on atari_SCC.c which was
7 * Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
8 * Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive
12 * for more details.
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/kdev_t.h>
18 #include <asm/io.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/ioport.h>
22 #include <linux/interrupt.h>
23 #include <linux/errno.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/mm.h>
27 #include <linux/serial.h>
28 #include <linux/fcntl.h>
29 #include <linux/major.h>
30 #include <linux/delay.h>
31 #include <linux/slab.h>
32 #include <linux/miscdevice.h>
33 #include <linux/console.h>
34 #include <linux/init.h>
35 #include <asm/setup.h>
36 #include <asm/bootinfo.h>
37
38 #ifdef CONFIG_MVME147_SCC
39 #include <asm/mvme147hw.h>
40 #endif
41 #ifdef CONFIG_MVME162_SCC
42 #include <asm/mvme16xhw.h>
43 #endif
44 #ifdef CONFIG_BVME6000_SCC
45 #include <asm/bvme6000hw.h>
46 #endif
47
48 #include <linux/generic_serial.h>
49 #include "scc.h"
50
51
52 #define CHANNEL_A 0
53 #define CHANNEL_B 1
54
55 #define SCC_MINOR_BASE 64
56
57 /* Shadows for all SCC write registers */
58 static unsigned char scc_shadow[2][16];
59
60 /* Location to access for SCC register access delay */
61 static volatile unsigned char *scc_del = NULL;
62
63 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
64 static unsigned char scc_last_status_reg[2];
65
66 /***************************** Prototypes *****************************/
67
68 /* Function prototypes */
69 static void scc_disable_tx_interrupts(void * ptr);
70 static void scc_enable_tx_interrupts(void * ptr);
71 static void scc_disable_rx_interrupts(void * ptr);
72 static void scc_enable_rx_interrupts(void * ptr);
73 static int scc_get_CD(void * ptr);
74 static void scc_shutdown_port(void * ptr);
75 static int scc_set_real_termios(void *ptr);
76 static void scc_hungup(void *ptr);
77 static void scc_close(void *ptr);
78 static int scc_chars_in_buffer(void * ptr);
79 static int scc_open(struct tty_struct * tty, struct file * filp);
80 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
81 unsigned int cmd, unsigned long arg);
82 static void scc_throttle(struct tty_struct *tty);
83 static void scc_unthrottle(struct tty_struct *tty);
84 static irqreturn_t scc_tx_int(int irq, void *data);
85 static irqreturn_t scc_rx_int(int irq, void *data);
86 static irqreturn_t scc_stat_int(int irq, void *data);
87 static irqreturn_t scc_spcond_int(int irq, void *data);
88 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
89 static void scc_break_ctl(struct tty_struct *tty, int break_state);
90
91 static struct tty_driver *scc_driver;
92
93 struct scc_port scc_ports[2];
94
95 int scc_initialized = 0;
96
97 /*---------------------------------------------------------------------------
98 * Interface from generic_serial.c back here
99 *--------------------------------------------------------------------------*/
100
101 static struct real_driver scc_real_driver = {
102 scc_disable_tx_interrupts,
103 scc_enable_tx_interrupts,
104 scc_disable_rx_interrupts,
105 scc_enable_rx_interrupts,
106 scc_get_CD,
107 scc_shutdown_port,
108 scc_set_real_termios,
109 scc_chars_in_buffer,
110 scc_close,
111 scc_hungup,
112 NULL
113 };
114
115
116 static const struct tty_operations scc_ops = {
117 .open = scc_open,
118 .close = gs_close,
119 .write = gs_write,
120 .put_char = gs_put_char,
121 .flush_chars = gs_flush_chars,
122 .write_room = gs_write_room,
123 .chars_in_buffer = gs_chars_in_buffer,
124 .flush_buffer = gs_flush_buffer,
125 .ioctl = scc_ioctl,
126 .throttle = scc_throttle,
127 .unthrottle = scc_unthrottle,
128 .set_termios = gs_set_termios,
129 .stop = gs_stop,
130 .start = gs_start,
131 .hangup = gs_hangup,
132 .break_ctl = scc_break_ctl,
133 };
134
135 /*----------------------------------------------------------------------------
136 * vme_scc_init() and support functions
137 *---------------------------------------------------------------------------*/
138
139 static int scc_init_drivers(void)
140 {
141 int error;
142
143 scc_driver = alloc_tty_driver(2);
144 if (!scc_driver)
145 return -ENOMEM;
146 scc_driver->owner = THIS_MODULE;
147 scc_driver->driver_name = "scc";
148 scc_driver->name = "ttyS";
149 scc_driver->major = TTY_MAJOR;
150 scc_driver->minor_start = SCC_MINOR_BASE;
151 scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
152 scc_driver->subtype = SERIAL_TYPE_NORMAL;
153 scc_driver->init_termios = tty_std_termios;
154 scc_driver->init_termios.c_cflag =
155 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
156 scc_driver->init_termios.c_ispeed = 9600;
157 scc_driver->init_termios.c_ospeed = 9600;
158 scc_driver->flags = TTY_DRIVER_REAL_RAW;
159 tty_set_operations(scc_driver, &scc_ops);
160
161 if ((error = tty_register_driver(scc_driver))) {
162 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
163 error);
164 put_tty_driver(scc_driver);
165 return 1;
166 }
167
168 return 0;
169 }
170
171
172 /* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
173 */
174
175 static void scc_init_portstructs(void)
176 {
177 struct scc_port *port;
178 int i;
179
180 for (i = 0; i < 2; i++) {
181 port = scc_ports + i;
182 port->gs.magic = SCC_MAGIC;
183 port->gs.close_delay = HZ/2;
184 port->gs.closing_wait = 30 * HZ;
185 port->gs.rd = &scc_real_driver;
186 #ifdef NEW_WRITE_LOCKING
187 port->gs.port_write_mutex = MUTEX;
188 #endif
189 init_waitqueue_head(&port->gs.open_wait);
190 init_waitqueue_head(&port->gs.close_wait);
191 }
192 }
193
194
195 #ifdef CONFIG_MVME147_SCC
196 static int mvme147_scc_init(void)
197 {
198 struct scc_port *port;
199
200 printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
201 /* Init channel A */
202 port = &scc_ports[0];
203 port->channel = CHANNEL_A;
204 port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
205 port->datap = port->ctrlp + 1;
206 port->port_a = &scc_ports[0];
207 port->port_b = &scc_ports[1];
208 request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
209 "SCC-A TX", port);
210 request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
211 "SCC-A status", port);
212 request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
213 "SCC-A RX", port);
214 request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
215 "SCC-A special cond", port);
216 {
217 SCC_ACCESS_INIT(port);
218
219 /* disable interrupts for this channel */
220 SCCwrite(INT_AND_DMA_REG, 0);
221 /* Set the interrupt vector */
222 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
223 /* Interrupt parameters: vector includes status, status low */
224 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
225 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
226 }
227
228 /* Init channel B */
229 port = &scc_ports[1];
230 port->channel = CHANNEL_B;
231 port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
232 port->datap = port->ctrlp + 1;
233 port->port_a = &scc_ports[0];
234 port->port_b = &scc_ports[1];
235 request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
236 "SCC-B TX", port);
237 request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
238 "SCC-B status", port);
239 request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
240 "SCC-B RX", port);
241 request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
242 "SCC-B special cond", port);
243 {
244 SCC_ACCESS_INIT(port);
245
246 /* disable interrupts for this channel */
247 SCCwrite(INT_AND_DMA_REG, 0);
248 }
249
250 /* Ensure interrupts are enabled in the PCC chip */
251 m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
252
253 /* Initialise the tty driver structures and register */
254 scc_init_portstructs();
255 scc_init_drivers();
256
257 return 0;
258 }
259 #endif
260
261
262 #ifdef CONFIG_MVME162_SCC
263 static int mvme162_scc_init(void)
264 {
265 struct scc_port *port;
266
267 if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
268 return (-ENODEV);
269
270 printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
271 /* Init channel A */
272 port = &scc_ports[0];
273 port->channel = CHANNEL_A;
274 port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
275 port->datap = port->ctrlp + 2;
276 port->port_a = &scc_ports[0];
277 port->port_b = &scc_ports[1];
278 request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
279 "SCC-A TX", port);
280 request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
281 "SCC-A status", port);
282 request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
283 "SCC-A RX", port);
284 request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
285 "SCC-A special cond", port);
286 {
287 SCC_ACCESS_INIT(port);
288
289 /* disable interrupts for this channel */
290 SCCwrite(INT_AND_DMA_REG, 0);
291 /* Set the interrupt vector */
292 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
293 /* Interrupt parameters: vector includes status, status low */
294 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
295 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
296 }
297
298 /* Init channel B */
299 port = &scc_ports[1];
300 port->channel = CHANNEL_B;
301 port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
302 port->datap = port->ctrlp + 2;
303 port->port_a = &scc_ports[0];
304 port->port_b = &scc_ports[1];
305 request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
306 "SCC-B TX", port);
307 request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
308 "SCC-B status", port);
309 request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
310 "SCC-B RX", port);
311 request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
312 "SCC-B special cond", port);
313
314 {
315 SCC_ACCESS_INIT(port); /* Either channel will do */
316
317 /* disable interrupts for this channel */
318 SCCwrite(INT_AND_DMA_REG, 0);
319 }
320
321 /* Ensure interrupts are enabled in the MC2 chip */
322 *(volatile char *)0xfff4201d = 0x14;
323
324 /* Initialise the tty driver structures and register */
325 scc_init_portstructs();
326 scc_init_drivers();
327
328 return 0;
329 }
330 #endif
331
332
333 #ifdef CONFIG_BVME6000_SCC
334 static int bvme6000_scc_init(void)
335 {
336 struct scc_port *port;
337
338 printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
339 /* Init channel A */
340 port = &scc_ports[0];
341 port->channel = CHANNEL_A;
342 port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
343 port->datap = port->ctrlp + 4;
344 port->port_a = &scc_ports[0];
345 port->port_b = &scc_ports[1];
346 request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
347 "SCC-A TX", port);
348 request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
349 "SCC-A status", port);
350 request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
351 "SCC-A RX", port);
352 request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
353 "SCC-A special cond", port);
354 {
355 SCC_ACCESS_INIT(port);
356
357 /* disable interrupts for this channel */
358 SCCwrite(INT_AND_DMA_REG, 0);
359 /* Set the interrupt vector */
360 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
361 /* Interrupt parameters: vector includes status, status low */
362 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
363 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
364 }
365
366 /* Init channel B */
367 port = &scc_ports[1];
368 port->channel = CHANNEL_B;
369 port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
370 port->datap = port->ctrlp + 4;
371 port->port_a = &scc_ports[0];
372 port->port_b = &scc_ports[1];
373 request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
374 "SCC-B TX", port);
375 request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
376 "SCC-B status", port);
377 request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
378 "SCC-B RX", port);
379 request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
380 "SCC-B special cond", port);
381
382 {
383 SCC_ACCESS_INIT(port); /* Either channel will do */
384
385 /* disable interrupts for this channel */
386 SCCwrite(INT_AND_DMA_REG, 0);
387 }
388
389 /* Initialise the tty driver structures and register */
390 scc_init_portstructs();
391 scc_init_drivers();
392
393 return 0;
394 }
395 #endif
396
397
398 static int vme_scc_init(void)
399 {
400 int res = -ENODEV;
401
402 #ifdef CONFIG_MVME147_SCC
403 if (MACH_IS_MVME147)
404 res = mvme147_scc_init();
405 #endif
406 #ifdef CONFIG_MVME162_SCC
407 if (MACH_IS_MVME16x)
408 res = mvme162_scc_init();
409 #endif
410 #ifdef CONFIG_BVME6000_SCC
411 if (MACH_IS_BVME6000)
412 res = bvme6000_scc_init();
413 #endif
414 return res;
415 }
416
417 module_init(vme_scc_init);
418
419
420 /*---------------------------------------------------------------------------
421 * Interrupt handlers
422 *--------------------------------------------------------------------------*/
423
424 static irqreturn_t scc_rx_int(int irq, void *data)
425 {
426 unsigned char ch;
427 struct scc_port *port = data;
428 struct tty_struct *tty = port->gs.tty;
429 SCC_ACCESS_INIT(port);
430
431 ch = SCCread_NB(RX_DATA_REG);
432 if (!tty) {
433 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
434 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
435 return IRQ_HANDLED;
436 }
437 tty_insert_flip_char(tty, ch, 0);
438
439 /* Check if another character is already ready; in that case, the
440 * spcond_int() function must be used, because this character may have an
441 * error condition that isn't signalled by the interrupt vector used!
442 */
443 if (SCCread(INT_PENDING_REG) &
444 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
445 scc_spcond_int (irq, data);
446 return IRQ_HANDLED;
447 }
448
449 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
450
451 tty_flip_buffer_push(tty);
452 return IRQ_HANDLED;
453 }
454
455
456 static irqreturn_t scc_spcond_int(int irq, void *data)
457 {
458 struct scc_port *port = data;
459 struct tty_struct *tty = port->gs.tty;
460 unsigned char stat, ch, err;
461 int int_pending_mask = port->channel == CHANNEL_A ?
462 IPR_A_RX : IPR_B_RX;
463 SCC_ACCESS_INIT(port);
464
465 if (!tty) {
466 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
467 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
468 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
469 return IRQ_HANDLED;
470 }
471 do {
472 stat = SCCread(SPCOND_STATUS_REG);
473 ch = SCCread_NB(RX_DATA_REG);
474
475 if (stat & SCSR_RX_OVERRUN)
476 err = TTY_OVERRUN;
477 else if (stat & SCSR_PARITY_ERR)
478 err = TTY_PARITY;
479 else if (stat & SCSR_CRC_FRAME_ERR)
480 err = TTY_FRAME;
481 else
482 err = 0;
483
484 tty_insert_flip_char(tty, ch, err);
485
486 /* ++TeSche: *All* errors have to be cleared manually,
487 * else the condition persists for the next chars
488 */
489 if (err)
490 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
491
492 } while(SCCread(INT_PENDING_REG) & int_pending_mask);
493
494 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
495
496 tty_flip_buffer_push(tty);
497 return IRQ_HANDLED;
498 }
499
500
501 static irqreturn_t scc_tx_int(int irq, void *data)
502 {
503 struct scc_port *port = data;
504 SCC_ACCESS_INIT(port);
505
506 if (!port->gs.tty) {
507 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
508 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
509 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
510 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
511 return IRQ_HANDLED;
512 }
513 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
514 if (port->x_char) {
515 SCCwrite(TX_DATA_REG, port->x_char);
516 port->x_char = 0;
517 }
518 else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
519 port->gs.tty->hw_stopped)
520 break;
521 else {
522 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
523 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
524 if (--port->gs.xmit_cnt <= 0)
525 break;
526 }
527 }
528 if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
529 port->gs.tty->hw_stopped) {
530 /* disable tx interrupts */
531 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
532 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
533 port->gs.flags &= ~GS_TX_INTEN;
534 }
535 if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
536 tty_wakeup(port->gs.tty);
537
538 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
539 return IRQ_HANDLED;
540 }
541
542
543 static irqreturn_t scc_stat_int(int irq, void *data)
544 {
545 struct scc_port *port = data;
546 unsigned channel = port->channel;
547 unsigned char last_sr, sr, changed;
548 SCC_ACCESS_INIT(port);
549
550 last_sr = scc_last_status_reg[channel];
551 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
552 changed = last_sr ^ sr;
553
554 if (changed & SR_DCD) {
555 port->c_dcd = !!(sr & SR_DCD);
556 if (!(port->gs.flags & ASYNC_CHECK_CD))
557 ; /* Don't report DCD changes */
558 else if (port->c_dcd) {
559 wake_up_interruptible(&port->gs.open_wait);
560 }
561 else {
562 if (port->gs.tty)
563 tty_hangup (port->gs.tty);
564 }
565 }
566 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
567 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
568 return IRQ_HANDLED;
569 }
570
571
572 /*---------------------------------------------------------------------------
573 * generic_serial.c callback funtions
574 *--------------------------------------------------------------------------*/
575
576 static void scc_disable_tx_interrupts(void *ptr)
577 {
578 struct scc_port *port = ptr;
579 unsigned long flags;
580 SCC_ACCESS_INIT(port);
581
582 local_irq_save(flags);
583 SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
584 port->gs.flags &= ~GS_TX_INTEN;
585 local_irq_restore(flags);
586 }
587
588
589 static void scc_enable_tx_interrupts(void *ptr)
590 {
591 struct scc_port *port = ptr;
592 unsigned long flags;
593 SCC_ACCESS_INIT(port);
594
595 local_irq_save(flags);
596 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
597 /* restart the transmitter */
598 scc_tx_int (0, port);
599 local_irq_restore(flags);
600 }
601
602
603 static void scc_disable_rx_interrupts(void *ptr)
604 {
605 struct scc_port *port = ptr;
606 unsigned long flags;
607 SCC_ACCESS_INIT(port);
608
609 local_irq_save(flags);
610 SCCmod(INT_AND_DMA_REG,
611 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
612 local_irq_restore(flags);
613 }
614
615
616 static void scc_enable_rx_interrupts(void *ptr)
617 {
618 struct scc_port *port = ptr;
619 unsigned long flags;
620 SCC_ACCESS_INIT(port);
621
622 local_irq_save(flags);
623 SCCmod(INT_AND_DMA_REG, 0xff,
624 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
625 local_irq_restore(flags);
626 }
627
628
629 static int scc_get_CD(void *ptr)
630 {
631 struct scc_port *port = ptr;
632 unsigned channel = port->channel;
633
634 return !!(scc_last_status_reg[channel] & SR_DCD);
635 }
636
637
638 static void scc_shutdown_port(void *ptr)
639 {
640 struct scc_port *port = ptr;
641
642 port->gs.flags &= ~ GS_ACTIVE;
643 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
644 scc_setsignals (port, 0, 0);
645 }
646 }
647
648
649 static int scc_set_real_termios (void *ptr)
650 {
651 /* the SCC has char sizes 5,7,6,8 in that order! */
652 static int chsize_map[4] = { 0, 2, 1, 3 };
653 unsigned cflag, baud, chsize, channel, brgval = 0;
654 unsigned long flags;
655 struct scc_port *port = ptr;
656 SCC_ACCESS_INIT(port);
657
658 if (!port->gs.tty || !port->gs.tty->termios) return 0;
659
660 channel = port->channel;
661
662 if (channel == CHANNEL_A)
663 return 0; /* Settings controlled by boot PROM */
664
665 cflag = port->gs.tty->termios->c_cflag;
666 baud = port->gs.baud;
667 chsize = (cflag & CSIZE) >> 4;
668
669 if (baud == 0) {
670 /* speed == 0 -> drop DTR */
671 local_irq_save(flags);
672 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
673 local_irq_restore(flags);
674 return 0;
675 }
676 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
677 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
678 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
679 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
680 return 0;
681 }
682
683 if (cflag & CLOCAL)
684 port->gs.flags &= ~ASYNC_CHECK_CD;
685 else
686 port->gs.flags |= ASYNC_CHECK_CD;
687
688 #ifdef CONFIG_MVME147_SCC
689 if (MACH_IS_MVME147)
690 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
691 #endif
692 #ifdef CONFIG_MVME162_SCC
693 if (MACH_IS_MVME16x)
694 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
695 #endif
696 #ifdef CONFIG_BVME6000_SCC
697 if (MACH_IS_BVME6000)
698 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
699 #endif
700 /* Now we have all parameters and can go to set them: */
701 local_irq_save(flags);
702
703 /* receiver's character size and auto-enables */
704 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
705 (chsize_map[chsize] << 6) |
706 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
707 /* parity and stop bits (both, Tx and Rx), clock mode never changes */
708 SCCmod (AUX1_CTRL_REG,
709 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
710 ((cflag & PARENB
711 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
712 : A1CR_PARITY_NONE)
713 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
714 /* sender's character size, set DTR for valid baud rate */
715 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
716 /* clock sources never change */
717 /* disable BRG before changing the value */
718 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
719 /* BRG value */
720 SCCwrite(TIMER_LOW_REG, brgval & 0xff);
721 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
722 /* BRG enable, and clock source never changes */
723 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
724
725 local_irq_restore(flags);
726
727 return 0;
728 }
729
730
731 static int scc_chars_in_buffer (void *ptr)
732 {
733 struct scc_port *port = ptr;
734 SCC_ACCESS_INIT(port);
735
736 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
737 }
738
739
740 /* Comment taken from sx.c (2.4.0):
741 I haven't the foggiest why the decrement use count has to happen
742 here. The whole linux serial drivers stuff needs to be redesigned.
743 My guess is that this is a hack to minimize the impact of a bug
744 elsewhere. Thinking about it some more. (try it sometime) Try
745 running minicom on a serial port that is driven by a modularized
746 driver. Have the modem hangup. Then remove the driver module. Then
747 exit minicom. I expect an "oops". -- REW */
748
749 static void scc_hungup(void *ptr)
750 {
751 scc_disable_tx_interrupts(ptr);
752 scc_disable_rx_interrupts(ptr);
753 }
754
755
756 static void scc_close(void *ptr)
757 {
758 scc_disable_tx_interrupts(ptr);
759 scc_disable_rx_interrupts(ptr);
760 }
761
762
763 /*---------------------------------------------------------------------------
764 * Internal support functions
765 *--------------------------------------------------------------------------*/
766
767 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
768 {
769 unsigned long flags;
770 unsigned char t;
771 SCC_ACCESS_INIT(port);
772
773 local_irq_save(flags);
774 t = SCCread(TX_CTRL_REG);
775 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
776 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
777 SCCwrite(TX_CTRL_REG, t);
778 local_irq_restore(flags);
779 }
780
781
782 static void scc_send_xchar(struct tty_struct *tty, char ch)
783 {
784 struct scc_port *port = (struct scc_port *)tty->driver_data;
785
786 port->x_char = ch;
787 if (ch)
788 scc_enable_tx_interrupts(port);
789 }
790
791
792 /*---------------------------------------------------------------------------
793 * Driver entrypoints referenced from above
794 *--------------------------------------------------------------------------*/
795
796 static int scc_open (struct tty_struct * tty, struct file * filp)
797 {
798 int line = tty->index;
799 int retval;
800 struct scc_port *port = &scc_ports[line];
801 int i, channel = port->channel;
802 unsigned long flags;
803 SCC_ACCESS_INIT(port);
804 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
805 static const struct {
806 unsigned reg, val;
807 } mvme_init_tab[] = {
808 /* Values for MVME162 and MVME147 */
809 /* no parity, 1 stop bit, async, 1:16 */
810 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
811 /* parity error is special cond, ints disabled, no DMA */
812 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
813 /* Rx 8 bits/char, no auto enable, Rx off */
814 { RX_CTRL_REG, RCR_CHSIZE_8 },
815 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
816 { TX_CTRL_REG, TCR_CHSIZE_8 },
817 /* special features off */
818 { AUX2_CTRL_REG, 0 },
819 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
820 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
821 /* Start Rx */
822 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
823 /* Start Tx */
824 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
825 /* Ext/Stat ints: DCD only */
826 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
827 /* Reset Ext/Stat ints */
828 { COMMAND_REG, CR_EXTSTAT_RESET },
829 /* ...again */
830 { COMMAND_REG, CR_EXTSTAT_RESET },
831 };
832 #endif
833 #if defined(CONFIG_BVME6000_SCC)
834 static const struct {
835 unsigned reg, val;
836 } bvme_init_tab[] = {
837 /* Values for BVME6000 */
838 /* no parity, 1 stop bit, async, 1:16 */
839 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
840 /* parity error is special cond, ints disabled, no DMA */
841 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
842 /* Rx 8 bits/char, no auto enable, Rx off */
843 { RX_CTRL_REG, RCR_CHSIZE_8 },
844 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
845 { TX_CTRL_REG, TCR_CHSIZE_8 },
846 /* special features off */
847 { AUX2_CTRL_REG, 0 },
848 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
849 { DPLL_CTRL_REG, DCR_BRG_ENAB },
850 /* Start Rx */
851 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
852 /* Start Tx */
853 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
854 /* Ext/Stat ints: DCD only */
855 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
856 /* Reset Ext/Stat ints */
857 { COMMAND_REG, CR_EXTSTAT_RESET },
858 /* ...again */
859 { COMMAND_REG, CR_EXTSTAT_RESET },
860 };
861 #endif
862 if (!(port->gs.flags & ASYNC_INITIALIZED)) {
863 local_irq_save(flags);
864 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
865 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
866 for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
867 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
868 }
869 #endif
870 #if defined(CONFIG_BVME6000_SCC)
871 if (MACH_IS_BVME6000) {
872 for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
873 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
874 }
875 #endif
876
877 /* remember status register for detection of DCD and CTS changes */
878 scc_last_status_reg[channel] = SCCread(STATUS_REG);
879
880 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
881 scc_setsignals (port, 1,1);
882 local_irq_restore(flags);
883 }
884
885 tty->driver_data = port;
886 port->gs.tty = tty;
887 port->gs.count++;
888 retval = gs_init_port(&port->gs);
889 if (retval) {
890 port->gs.count--;
891 return retval;
892 }
893 port->gs.flags |= GS_ACTIVE;
894 retval = gs_block_til_ready(port, filp);
895
896 if (retval) {
897 port->gs.count--;
898 return retval;
899 }
900
901 port->c_dcd = scc_get_CD (port);
902
903 scc_enable_rx_interrupts(port);
904
905 return 0;
906 }
907
908
909 static void scc_throttle (struct tty_struct * tty)
910 {
911 struct scc_port *port = (struct scc_port *)tty->driver_data;
912 unsigned long flags;
913 SCC_ACCESS_INIT(port);
914
915 if (tty->termios->c_cflag & CRTSCTS) {
916 local_irq_save(flags);
917 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
918 local_irq_restore(flags);
919 }
920 if (I_IXOFF(tty))
921 scc_send_xchar(tty, STOP_CHAR(tty));
922 }
923
924
925 static void scc_unthrottle (struct tty_struct * tty)
926 {
927 struct scc_port *port = (struct scc_port *)tty->driver_data;
928 unsigned long flags;
929 SCC_ACCESS_INIT(port);
930
931 if (tty->termios->c_cflag & CRTSCTS) {
932 local_irq_save(flags);
933 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
934 local_irq_restore(flags);
935 }
936 if (I_IXOFF(tty))
937 scc_send_xchar(tty, START_CHAR(tty));
938 }
939
940
941 static int scc_ioctl(struct tty_struct *tty, struct file *file,
942 unsigned int cmd, unsigned long arg)
943 {
944 return -ENOIOCTLCMD;
945 }
946
947
948 static void scc_break_ctl(struct tty_struct *tty, int break_state)
949 {
950 struct scc_port *port = (struct scc_port *)tty->driver_data;
951 unsigned long flags;
952 SCC_ACCESS_INIT(port);
953
954 local_irq_save(flags);
955 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
956 break_state ? TCR_SEND_BREAK : 0);
957 local_irq_restore(flags);
958 }
959
960
961 /*---------------------------------------------------------------------------
962 * Serial console stuff...
963 *--------------------------------------------------------------------------*/
964
965 #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
966
967 static void scc_ch_write (char ch)
968 {
969 volatile char *p = NULL;
970
971 #ifdef CONFIG_MVME147_SCC
972 if (MACH_IS_MVME147)
973 p = (volatile char *)M147_SCC_A_ADDR;
974 #endif
975 #ifdef CONFIG_MVME162_SCC
976 if (MACH_IS_MVME16x)
977 p = (volatile char *)MVME_SCC_A_ADDR;
978 #endif
979 #ifdef CONFIG_BVME6000_SCC
980 if (MACH_IS_BVME6000)
981 p = (volatile char *)BVME_SCC_A_ADDR;
982 #endif
983
984 do {
985 scc_delay();
986 }
987 while (!(*p & 4));
988 scc_delay();
989 *p = 8;
990 scc_delay();
991 *p = ch;
992 }
993
994 /* The console must be locked when we get here. */
995
996 static void scc_console_write (struct console *co, const char *str, unsigned count)
997 {
998 unsigned long flags;
999
1000 local_irq_save(flags);
1001
1002 while (count--)
1003 {
1004 if (*str == '\n')
1005 scc_ch_write ('\r');
1006 scc_ch_write (*str++);
1007 }
1008 local_irq_restore(flags);
1009 }
1010
1011 static struct tty_driver *scc_console_device(struct console *c, int *index)
1012 {
1013 *index = c->index;
1014 return scc_driver;
1015 }
1016
1017
1018 static int __init scc_console_setup(struct console *co, char *options)
1019 {
1020 return 0;
1021 }
1022
1023
1024 static struct console sercons = {
1025 .name = "ttyS",
1026 .write = scc_console_write,
1027 .device = scc_console_device,
1028 .setup = scc_console_setup,
1029 .flags = CON_PRINTBUFFER,
1030 .index = -1,
1031 };
1032
1033
1034 static int __init vme_scc_console_init(void)
1035 {
1036 if (vme_brdtype == VME_TYPE_MVME147 ||
1037 vme_brdtype == VME_TYPE_MVME162 ||
1038 vme_brdtype == VME_TYPE_MVME172 ||
1039 vme_brdtype == VME_TYPE_BVME4000 ||
1040 vme_brdtype == VME_TYPE_BVME6000)
1041 register_console(&sercons);
1042 return 0;
1043 }
1044 console_initcall(vme_scc_console_init);
Linux with added FPC-III support