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[PATCH] remove many unneeded #includes of sched.h
[net-next-2.6.git] / drivers / char / vme_scc.c
CommitLineData
1da177e4
LT		 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>
1da177e4
LT		 17#include <linux/kdev_t.h>
18#include <asm/io.h>
19#include <linux/kernel.h>
1da177e4
LT		 20#include <linux/ioport.h>
21#include <linux/interrupt.h>
22#include <linux/errno.h>
23#include <linux/tty.h>
24#include <linux/tty_flip.h>
25#include <linux/mm.h>
26#include <linux/serial.h>
27#include <linux/fcntl.h>
28#include <linux/major.h>
29#include <linux/delay.h>
30#include <linux/slab.h>
31#include <linux/miscdevice.h>
32#include <linux/console.h>
33#include <linux/init.h>
34#include <asm/setup.h>
35#include <asm/bootinfo.h>
36
37#ifdef CONFIG_MVME147_SCC
38#include <asm/mvme147hw.h>
39#endif
40#ifdef CONFIG_MVME162_SCC
41#include <asm/mvme16xhw.h>
42#endif
43#ifdef CONFIG_BVME6000_SCC
44#include <asm/bvme6000hw.h>
45#endif
46
47#include <linux/generic_serial.h>
48#include "scc.h"
49
50
51#define CHANNEL_A 0
52#define CHANNEL_B 1
53
54#define SCC_MINOR_BASE 64
55
56/* Shadows for all SCC write registers */
57static unsigned char scc_shadow[2][16];
58
59/* Location to access for SCC register access delay */
60static volatile unsigned char *scc_del = NULL;
61
62/* To keep track of STATUS_REG state for detection of Ext/Status int source */
63static unsigned char scc_last_status_reg[2];
64
65/***************************** Prototypes *****************************/
66
67/* Function prototypes */
68static void scc_disable_tx_interrupts(void * ptr);
69static void scc_enable_tx_interrupts(void * ptr);
70static void scc_disable_rx_interrupts(void * ptr);
71static void scc_enable_rx_interrupts(void * ptr);
72static int scc_get_CD(void * ptr);
73static void scc_shutdown_port(void * ptr);
74static int scc_set_real_termios(void *ptr);
75static void scc_hungup(void *ptr);
76static void scc_close(void *ptr);
77static int scc_chars_in_buffer(void * ptr);
78static int scc_open(struct tty_struct * tty, struct file * filp);
79static int scc_ioctl(struct tty_struct * tty, struct file * filp,
80 unsigned int cmd, unsigned long arg);
81static void scc_throttle(struct tty_struct *tty);
82static void scc_unthrottle(struct tty_struct *tty);
7d12e780
DH		 83static irqreturn_t scc_tx_int(int irq, void *data);
84static irqreturn_t scc_rx_int(int irq, void *data);
85static irqreturn_t scc_stat_int(int irq, void *data);
86static irqreturn_t scc_spcond_int(int irq, void *data);
1da177e4
LT		 87static void scc_setsignals(struct scc_port *port, int dtr, int rts);
88static void scc_break_ctl(struct tty_struct *tty, int break_state);
89
90static struct tty_driver *scc_driver;
91
92struct scc_port scc_ports[2];
93
94int scc_initialized = 0;
95
96/*---------------------------------------------------------------------------
97 * Interface from generic_serial.c back here
98 *--------------------------------------------------------------------------*/
99
100static struct real_driver scc_real_driver = {
101 scc_disable_tx_interrupts,
102 scc_enable_tx_interrupts,
103 scc_disable_rx_interrupts,
104 scc_enable_rx_interrupts,
105 scc_get_CD,
106 scc_shutdown_port,
107 scc_set_real_termios,
108 scc_chars_in_buffer,
109 scc_close,
110 scc_hungup,
111 NULL
112};
113
114
b68e31d0 115static const struct tty_operations scc_ops = {
1da177e4
LT		 116 .open = scc_open,
117 .close = gs_close,
118 .write = gs_write,
119 .put_char = gs_put_char,
120 .flush_chars = gs_flush_chars,
121 .write_room = gs_write_room,
122 .chars_in_buffer = gs_chars_in_buffer,
123 .flush_buffer = gs_flush_buffer,
124 .ioctl = scc_ioctl,
125 .throttle = scc_throttle,
126 .unthrottle = scc_unthrottle,
127 .set_termios = gs_set_termios,
128 .stop = gs_stop,
129 .start = gs_start,
130 .hangup = gs_hangup,
131 .break_ctl = scc_break_ctl,
132};
133
134/*----------------------------------------------------------------------------
135 * vme_scc_init() and support functions
136 *---------------------------------------------------------------------------*/
137
138static int scc_init_drivers(void)
139{
140 int error;
141
142 scc_driver = alloc_tty_driver(2);
143 if (!scc_driver)
144 return -ENOMEM;
145 scc_driver->owner = THIS_MODULE;
146 scc_driver->driver_name = "scc";
147 scc_driver->name = "ttyS";
1da177e4
LT		 148 scc_driver->major = TTY_MAJOR;
149 scc_driver->minor_start = SCC_MINOR_BASE;
150 scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
151 scc_driver->subtype = SERIAL_TYPE_NORMAL;
152 scc_driver->init_termios = tty_std_termios;
153 scc_driver->init_termios.c_cflag =
154 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
606d099c
AC		 155 scc_driver->init_termios.c_ispeed = 9600;
156 scc_driver->init_termios.c_ospeed = 9600;
1da177e4
LT		 157 scc_driver->flags = TTY_DRIVER_REAL_RAW;
158 tty_set_operations(scc_driver, &scc_ops);
159
160 if ((error = tty_register_driver(scc_driver))) {
161 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
162 error);
163 put_tty_driver(scc_driver);
164 return 1;
165 }
166
167 return 0;
168}
169
170
171/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
172 */
173
174static void scc_init_portstructs(void)
175{
176 struct scc_port *port;
177 int i;
178
179 for (i = 0; i < 2; i++) {
180 port = scc_ports + i;
181 port->gs.magic = SCC_MAGIC;
182 port->gs.close_delay = HZ/2;
183 port->gs.closing_wait = 30 * HZ;
184 port->gs.rd = &scc_real_driver;
185#ifdef NEW_WRITE_LOCKING
81861d78 186 port->gs.port_write_mutex = MUTEX;
1da177e4
LT		 187#endif
188 init_waitqueue_head(&port->gs.open_wait);
189 init_waitqueue_head(&port->gs.close_wait);
190 }
191}
192
193
194#ifdef CONFIG_MVME147_SCC
195static int mvme147_scc_init(void)
196{
197 struct scc_port *port;
198
199 printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
200 /* Init channel A */
201 port = &scc_ports[0];
202 port->channel = CHANNEL_A;
203 port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
204 port->datap = port->ctrlp + 1;
205 port->port_a = &scc_ports[0];
206 port->port_b = &scc_ports[1];
0f2ed4c6 207 request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 208 "SCC-A TX", port);
0f2ed4c6 209 request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 210 "SCC-A status", port);
0f2ed4c6 211 request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 212 "SCC-A RX", port);
0f2ed4c6 213 request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 214 "SCC-A special cond", port);
215 {
216 SCC_ACCESS_INIT(port);
217
218 /* disable interrupts for this channel */
219 SCCwrite(INT_AND_DMA_REG, 0);
220 /* Set the interrupt vector */
221 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
222 /* Interrupt parameters: vector includes status, status low */
223 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
224 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
225 }
226
227 /* Init channel B */
228 port = &scc_ports[1];
229 port->channel = CHANNEL_B;
230 port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
231 port->datap = port->ctrlp + 1;
232 port->port_a = &scc_ports[0];
233 port->port_b = &scc_ports[1];
0f2ed4c6 234 request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 235 "SCC-B TX", port);
0f2ed4c6 236 request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 237 "SCC-B status", port);
0f2ed4c6 238 request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 239 "SCC-B RX", port);
0f2ed4c6 240 request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 241 "SCC-B special cond", port);
242 {
243 SCC_ACCESS_INIT(port);
244
245 /* disable interrupts for this channel */
246 SCCwrite(INT_AND_DMA_REG, 0);
247 }
248
249 /* Ensure interrupts are enabled in the PCC chip */
250 m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
251
252 /* Initialise the tty driver structures and register */
253 scc_init_portstructs();
254 scc_init_drivers();
255
256 return 0;
257}
258#endif
259
260
261#ifdef CONFIG_MVME162_SCC
262static int mvme162_scc_init(void)
263{
264 struct scc_port *port;
265
266 if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
267 return (-ENODEV);
268
269 printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
270 /* Init channel A */
271 port = &scc_ports[0];
272 port->channel = CHANNEL_A;
273 port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
274 port->datap = port->ctrlp + 2;
275 port->port_a = &scc_ports[0];
276 port->port_b = &scc_ports[1];
0f2ed4c6 277 request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 278 "SCC-A TX", port);
0f2ed4c6 279 request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 280 "SCC-A status", port);
0f2ed4c6 281 request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 282 "SCC-A RX", port);
0f2ed4c6 283 request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 284 "SCC-A special cond", port);
285 {
286 SCC_ACCESS_INIT(port);
287
288 /* disable interrupts for this channel */
289 SCCwrite(INT_AND_DMA_REG, 0);
290 /* Set the interrupt vector */
291 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
292 /* Interrupt parameters: vector includes status, status low */
293 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
294 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
295 }
296
297 /* Init channel B */
298 port = &scc_ports[1];
299 port->channel = CHANNEL_B;
300 port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
301 port->datap = port->ctrlp + 2;
302 port->port_a = &scc_ports[0];
303 port->port_b = &scc_ports[1];
0f2ed4c6 304 request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 305 "SCC-B TX", port);
0f2ed4c6 306 request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 307 "SCC-B status", port);
0f2ed4c6 308 request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 309 "SCC-B RX", port);
0f2ed4c6 310 request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 311 "SCC-B special cond", port);
312
313 {
314 SCC_ACCESS_INIT(port); /* Either channel will do */
315
316 /* disable interrupts for this channel */
317 SCCwrite(INT_AND_DMA_REG, 0);
318 }
319
320 /* Ensure interrupts are enabled in the MC2 chip */
321 *(volatile char *)0xfff4201d = 0x14;
322
323 /* Initialise the tty driver structures and register */
324 scc_init_portstructs();
325 scc_init_drivers();
326
327 return 0;
328}
329#endif
330
331
332#ifdef CONFIG_BVME6000_SCC
333static int bvme6000_scc_init(void)
334{
335 struct scc_port *port;
336
337 printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
338 /* Init channel A */
339 port = &scc_ports[0];
340 port->channel = CHANNEL_A;
341 port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
342 port->datap = port->ctrlp + 4;
343 port->port_a = &scc_ports[0];
344 port->port_b = &scc_ports[1];
0f2ed4c6 345 request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 346 "SCC-A TX", port);
0f2ed4c6 347 request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 348 "SCC-A status", port);
0f2ed4c6 349 request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 350 "SCC-A RX", port);
0f2ed4c6 351 request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 352 "SCC-A special cond", port);
353 {
354 SCC_ACCESS_INIT(port);
355
356 /* disable interrupts for this channel */
357 SCCwrite(INT_AND_DMA_REG, 0);
358 /* Set the interrupt vector */
359 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
360 /* Interrupt parameters: vector includes status, status low */
361 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
362 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
363 }
364
365 /* Init channel B */
366 port = &scc_ports[1];
367 port->channel = CHANNEL_B;
368 port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
369 port->datap = port->ctrlp + 4;
370 port->port_a = &scc_ports[0];
371 port->port_b = &scc_ports[1];
0f2ed4c6 372 request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
1da177e4 373 "SCC-B TX", port);
0f2ed4c6 374 request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
1da177e4 375 "SCC-B status", port);
0f2ed4c6 376 request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
1da177e4 377 "SCC-B RX", port);
0f2ed4c6 378 request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
1da177e4
LT		 379 "SCC-B special cond", port);
380
381 {
382 SCC_ACCESS_INIT(port); /* Either channel will do */
383
384 /* disable interrupts for this channel */
385 SCCwrite(INT_AND_DMA_REG, 0);
386 }
387
388 /* Initialise the tty driver structures and register */
389 scc_init_portstructs();
390 scc_init_drivers();
391
392 return 0;
393}
394#endif
395
396
397static int vme_scc_init(void)
398{
399 int res = -ENODEV;
400
401#ifdef CONFIG_MVME147_SCC
402 if (MACH_IS_MVME147)
403 res = mvme147_scc_init();
404#endif
405#ifdef CONFIG_MVME162_SCC
406 if (MACH_IS_MVME16x)
407 res = mvme162_scc_init();
408#endif
409#ifdef CONFIG_BVME6000_SCC
410 if (MACH_IS_BVME6000)
411 res = bvme6000_scc_init();
412#endif
413 return res;
414}
415
416module_init(vme_scc_init);
417
418
419/*---------------------------------------------------------------------------
420 * Interrupt handlers
421 *--------------------------------------------------------------------------*/
422
7d12e780 423static irqreturn_t scc_rx_int(int irq, void *data)
1da177e4
LT		 424{
425 unsigned char ch;
426 struct scc_port *port = data;
427 struct tty_struct *tty = port->gs.tty;
428 SCC_ACCESS_INIT(port);
429
430 ch = SCCread_NB(RX_DATA_REG);
431 if (!tty) {
432 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
433 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
434 return IRQ_HANDLED;
435 }
33f0f88f 436 tty_insert_flip_char(tty, ch, 0);
1da177e4
LT		 437
438 /* Check if another character is already ready; in that case, the
439 * spcond_int() function must be used, because this character may have an
440 * error condition that isn't signalled by the interrupt vector used!
441 */
442 if (SCCread(INT_PENDING_REG) &
443 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
7d12e780 444 scc_spcond_int (irq, data);
1da177e4
LT		 445 return IRQ_HANDLED;
446 }
447
448 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
449
450 tty_flip_buffer_push(tty);
451 return IRQ_HANDLED;
452}
453
454
7d12e780 455static irqreturn_t scc_spcond_int(int irq, void *data)
1da177e4
LT		 456{
457 struct scc_port *port = data;
458 struct tty_struct *tty = port->gs.tty;
459 unsigned char stat, ch, err;
460 int int_pending_mask = port->channel == CHANNEL_A ?
461 IPR_A_RX : IPR_B_RX;
462 SCC_ACCESS_INIT(port);
463
464 if (!tty) {
465 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
466 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
467 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
468 return IRQ_HANDLED;
469 }
470 do {
471 stat = SCCread(SPCOND_STATUS_REG);
472 ch = SCCread_NB(RX_DATA_REG);
473
474 if (stat & SCSR_RX_OVERRUN)
475 err = TTY_OVERRUN;
476 else if (stat & SCSR_PARITY_ERR)
477 err = TTY_PARITY;
478 else if (stat & SCSR_CRC_FRAME_ERR)
479 err = TTY_FRAME;
480 else
481 err = 0;
482
33f0f88f 483 tty_insert_flip_char(tty, ch, err);
1da177e4
LT		 484
485 /* ++TeSche: *All* errors have to be cleared manually,
486 * else the condition persists for the next chars
487 */
488 if (err)
489 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
490
491 } while(SCCread(INT_PENDING_REG) & int_pending_mask);
492
493 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
494
495 tty_flip_buffer_push(tty);
496 return IRQ_HANDLED;
497}
498
499
7d12e780 500static irqreturn_t scc_tx_int(int irq, void *data)
1da177e4
LT		 501{
502 struct scc_port *port = data;
503 SCC_ACCESS_INIT(port);
504
505 if (!port->gs.tty) {
506 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
507 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
508 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
509 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
510 return IRQ_HANDLED;
511 }
512 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
513 if (port->x_char) {
514 SCCwrite(TX_DATA_REG, port->x_char);
515 port->x_char = 0;
516 }
517 else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
518 port->gs.tty->hw_stopped)
519 break;
520 else {
521 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
522 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
523 if (--port->gs.xmit_cnt <= 0)
524 break;
525 }
526 }
527 if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
528 port->gs.tty->hw_stopped) {
529 /* disable tx interrupts */
530 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
531 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
532 port->gs.flags &= ~GS_TX_INTEN;
533 }
534 if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
535 tty_wakeup(port->gs.tty);
536
537 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
538 return IRQ_HANDLED;
539}
540
541
7d12e780 542static irqreturn_t scc_stat_int(int irq, void *data)
1da177e4
LT		 543{
544 struct scc_port *port = data;
545 unsigned channel = port->channel;
546 unsigned char last_sr, sr, changed;
547 SCC_ACCESS_INIT(port);
548
549 last_sr = scc_last_status_reg[channel];
550 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
551 changed = last_sr ^ sr;
552
553 if (changed & SR_DCD) {
554 port->c_dcd = !!(sr & SR_DCD);
555 if (!(port->gs.flags & ASYNC_CHECK_CD))
556 ; /* Don't report DCD changes */
557 else if (port->c_dcd) {
558 wake_up_interruptible(&port->gs.open_wait);
559 }
560 else {
561 if (port->gs.tty)
562 tty_hangup (port->gs.tty);
563 }
564 }
565 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
566 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
567 return IRQ_HANDLED;
568}
569
570
571/*---------------------------------------------------------------------------
572 * generic_serial.c callback funtions
573 *--------------------------------------------------------------------------*/
574
575static void scc_disable_tx_interrupts(void *ptr)
576{
577 struct scc_port *port = ptr;
578 unsigned long flags;
579 SCC_ACCESS_INIT(port);
580
581 local_irq_save(flags);
582 SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
583 port->gs.flags &= ~GS_TX_INTEN;
584 local_irq_restore(flags);
585}
586
587
588static void scc_enable_tx_interrupts(void *ptr)
589{
590 struct scc_port *port = ptr;
591 unsigned long flags;
592 SCC_ACCESS_INIT(port);
593
594 local_irq_save(flags);
595 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
596 /* restart the transmitter */
2850bc27 597 scc_tx_int (0, port);
1da177e4
LT		 598 local_irq_restore(flags);
599}
600
601
602static void scc_disable_rx_interrupts(void *ptr)
603{
604 struct scc_port *port = ptr;
605 unsigned long flags;
606 SCC_ACCESS_INIT(port);
607
608 local_irq_save(flags);
609 SCCmod(INT_AND_DMA_REG,
610 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
611 local_irq_restore(flags);
612}
613
614
615static void scc_enable_rx_interrupts(void *ptr)
616{
617 struct scc_port *port = ptr;
618 unsigned long flags;
619 SCC_ACCESS_INIT(port);
620
621 local_irq_save(flags);
622 SCCmod(INT_AND_DMA_REG, 0xff,
623 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
624 local_irq_restore(flags);
625}
626
627
628static int scc_get_CD(void *ptr)
629{
630 struct scc_port *port = ptr;
631 unsigned channel = port->channel;
632
633 return !!(scc_last_status_reg[channel] & SR_DCD);
634}
635
636
637static void scc_shutdown_port(void *ptr)
638{
639 struct scc_port *port = ptr;
640
641 port->gs.flags &= ~ GS_ACTIVE;
642 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
643 scc_setsignals (port, 0, 0);
644 }
645}
646
647
648static int scc_set_real_termios (void *ptr)
649{
650 /* the SCC has char sizes 5,7,6,8 in that order! */
651 static int chsize_map[4] = { 0, 2, 1, 3 };
652 unsigned cflag, baud, chsize, channel, brgval = 0;
653 unsigned long flags;
654 struct scc_port *port = ptr;
655 SCC_ACCESS_INIT(port);
656
657 if (!port->gs.tty || !port->gs.tty->termios) return 0;
658
659 channel = port->channel;
660
661 if (channel == CHANNEL_A)
662 return 0; /* Settings controlled by boot PROM */
663
664 cflag = port->gs.tty->termios->c_cflag;
665 baud = port->gs.baud;
666 chsize = (cflag & CSIZE) >> 4;
667
668 if (baud == 0) {
669 /* speed == 0 -> drop DTR */
670 local_irq_save(flags);
671 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
672 local_irq_restore(flags);
673 return 0;
674 }
675 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
676 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
677 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
678 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
679 return 0;
680 }
681
682 if (cflag & CLOCAL)
683 port->gs.flags &= ~ASYNC_CHECK_CD;
684 else
685 port->gs.flags |= ASYNC_CHECK_CD;
686
687#ifdef CONFIG_MVME147_SCC
688 if (MACH_IS_MVME147)
689 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
690#endif
691#ifdef CONFIG_MVME162_SCC
692 if (MACH_IS_MVME16x)
693 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
694#endif
695#ifdef CONFIG_BVME6000_SCC
696 if (MACH_IS_BVME6000)
697 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
698#endif
699 /* Now we have all parameters and can go to set them: */
700 local_irq_save(flags);
701
702 /* receiver's character size and auto-enables */
703 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
704 (chsize_map[chsize] << 6) |
705 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
706 /* parity and stop bits (both, Tx and Rx), clock mode never changes */
707 SCCmod (AUX1_CTRL_REG,
708 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
709 ((cflag & PARENB
710 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
711 : A1CR_PARITY_NONE)
712 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
713 /* sender's character size, set DTR for valid baud rate */
714 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
715 /* clock sources never change */
716 /* disable BRG before changing the value */
717 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
718 /* BRG value */
719 SCCwrite(TIMER_LOW_REG, brgval & 0xff);
720 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
721 /* BRG enable, and clock source never changes */
722 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
723
724 local_irq_restore(flags);
725
726 return 0;
727}
728
729
730static int scc_chars_in_buffer (void *ptr)
731{
732 struct scc_port *port = ptr;
733 SCC_ACCESS_INIT(port);
734
735 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
736}
737
738
739/* Comment taken from sx.c (2.4.0):
740 I haven't the foggiest why the decrement use count has to happen
741 here. The whole linux serial drivers stuff needs to be redesigned.
742 My guess is that this is a hack to minimize the impact of a bug
743 elsewhere. Thinking about it some more. (try it sometime) Try
744 running minicom on a serial port that is driven by a modularized
745 driver. Have the modem hangup. Then remove the driver module. Then
746 exit minicom. I expect an "oops". -- REW */
747
748static void scc_hungup(void *ptr)
749{
750 scc_disable_tx_interrupts(ptr);
751 scc_disable_rx_interrupts(ptr);
752}
753
754
755static void scc_close(void *ptr)
756{
757 scc_disable_tx_interrupts(ptr);
758 scc_disable_rx_interrupts(ptr);
759}
760
761
762/*---------------------------------------------------------------------------
763 * Internal support functions
764 *--------------------------------------------------------------------------*/
765
766static void scc_setsignals(struct scc_port *port, int dtr, int rts)
767{
768 unsigned long flags;
769 unsigned char t;
770 SCC_ACCESS_INIT(port);
771
772 local_irq_save(flags);
773 t = SCCread(TX_CTRL_REG);
774 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
775 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
776 SCCwrite(TX_CTRL_REG, t);
777 local_irq_restore(flags);
778}
779
780
781static void scc_send_xchar(struct tty_struct *tty, char ch)
782{
783 struct scc_port *port = (struct scc_port *)tty->driver_data;
784
785 port->x_char = ch;
786 if (ch)
787 scc_enable_tx_interrupts(port);
788}
789
790
791/*---------------------------------------------------------------------------
792 * Driver entrypoints referenced from above
793 *--------------------------------------------------------------------------*/
794
795static int scc_open (struct tty_struct * tty, struct file * filp)
796{
797 int line = tty->index;
798 int retval;
799 struct scc_port *port = &scc_ports[line];
800 int i, channel = port->channel;
801 unsigned long flags;
802 SCC_ACCESS_INIT(port);
803#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
804 static const struct {
805 unsigned reg, val;
806 } mvme_init_tab[] = {
807 /* Values for MVME162 and MVME147 */
808 /* no parity, 1 stop bit, async, 1:16 */
809 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
810 /* parity error is special cond, ints disabled, no DMA */
811 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
812 /* Rx 8 bits/char, no auto enable, Rx off */
813 { RX_CTRL_REG, RCR_CHSIZE_8 },
814 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
815 { TX_CTRL_REG, TCR_CHSIZE_8 },
816 /* special features off */
817 { AUX2_CTRL_REG, 0 },
818 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
819 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
820 /* Start Rx */
821 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
822 /* Start Tx */
823 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
824 /* Ext/Stat ints: DCD only */
825 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
826 /* Reset Ext/Stat ints */
827 { COMMAND_REG, CR_EXTSTAT_RESET },
828 /* ...again */
829 { COMMAND_REG, CR_EXTSTAT_RESET },
830 };
831#endif
832#if defined(CONFIG_BVME6000_SCC)
833 static const struct {
834 unsigned reg, val;
835 } bvme_init_tab[] = {
836 /* Values for BVME6000 */
837 /* no parity, 1 stop bit, async, 1:16 */
838 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
839 /* parity error is special cond, ints disabled, no DMA */
840 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
841 /* Rx 8 bits/char, no auto enable, Rx off */
842 { RX_CTRL_REG, RCR_CHSIZE_8 },
843 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
844 { TX_CTRL_REG, TCR_CHSIZE_8 },
845 /* special features off */
846 { AUX2_CTRL_REG, 0 },
847 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
848 { DPLL_CTRL_REG, DCR_BRG_ENAB },
849 /* Start Rx */
850 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
851 /* Start Tx */
852 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
853 /* Ext/Stat ints: DCD only */
854 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
855 /* Reset Ext/Stat ints */
856 { COMMAND_REG, CR_EXTSTAT_RESET },
857 /* ...again */
858 { COMMAND_REG, CR_EXTSTAT_RESET },
859 };
860#endif
861 if (!(port->gs.flags & ASYNC_INITIALIZED)) {
862 local_irq_save(flags);
863#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
864 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
fe971071 865 for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
1da177e4
LT		 866 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
867 }
868#endif
869#if defined(CONFIG_BVME6000_SCC)
870 if (MACH_IS_BVME6000) {
fe971071 871 for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
1da177e4
LT		 872 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
873 }
874#endif
875
876 /* remember status register for detection of DCD and CTS changes */
877 scc_last_status_reg[channel] = SCCread(STATUS_REG);
878
879 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
880 scc_setsignals (port, 1,1);
881 local_irq_restore(flags);
882 }
883
884 tty->driver_data = port;
885 port->gs.tty = tty;
886 port->gs.count++;
887 retval = gs_init_port(&port->gs);
888 if (retval) {
889 port->gs.count--;
890 return retval;
891 }
892 port->gs.flags |= GS_ACTIVE;
893 retval = gs_block_til_ready(port, filp);
894
895 if (retval) {
896 port->gs.count--;
897 return retval;
898 }
899
900 port->c_dcd = scc_get_CD (port);
901
902 scc_enable_rx_interrupts(port);
903
904 return 0;
905}
906
907
908static void scc_throttle (struct tty_struct * tty)
909{
910 struct scc_port *port = (struct scc_port *)tty->driver_data;
911 unsigned long flags;
912 SCC_ACCESS_INIT(port);
913
914 if (tty->termios->c_cflag & CRTSCTS) {
915 local_irq_save(flags);
916 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
917 local_irq_restore(flags);
918 }
919 if (I_IXOFF(tty))
920 scc_send_xchar(tty, STOP_CHAR(tty));
921}
922
923
924static void scc_unthrottle (struct tty_struct * tty)
925{
926 struct scc_port *port = (struct scc_port *)tty->driver_data;
927 unsigned long flags;
928 SCC_ACCESS_INIT(port);
929
930 if (tty->termios->c_cflag & CRTSCTS) {
931 local_irq_save(flags);
932 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
933 local_irq_restore(flags);
934 }
935 if (I_IXOFF(tty))
936 scc_send_xchar(tty, START_CHAR(tty));
937}
938
939
940static int scc_ioctl(struct tty_struct *tty, struct file *file,
941 unsigned int cmd, unsigned long arg)
942{
943 return -ENOIOCTLCMD;
944}
945
946
947static void scc_break_ctl(struct tty_struct *tty, int break_state)
948{
949 struct scc_port *port = (struct scc_port *)tty->driver_data;
950 unsigned long flags;
951 SCC_ACCESS_INIT(port);
952
953 local_irq_save(flags);
954 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
955 break_state ? TCR_SEND_BREAK : 0);
956 local_irq_restore(flags);
957}
958
959
960/*---------------------------------------------------------------------------
961 * Serial console stuff...
962 *--------------------------------------------------------------------------*/
963
964#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
965
966static void scc_ch_write (char ch)
967{
968 volatile char *p = NULL;
969
970#ifdef CONFIG_MVME147_SCC
971 if (MACH_IS_MVME147)
972 p = (volatile char *)M147_SCC_A_ADDR;
973#endif
974#ifdef CONFIG_MVME162_SCC
975 if (MACH_IS_MVME16x)
976 p = (volatile char *)MVME_SCC_A_ADDR;
977#endif
978#ifdef CONFIG_BVME6000_SCC
979 if (MACH_IS_BVME6000)
980 p = (volatile char *)BVME_SCC_A_ADDR;
981#endif
982
983 do {
984 scc_delay();
985 }
986 while (!(*p & 4));
987 scc_delay();
988 *p = 8;
989 scc_delay();
990 *p = ch;
991}
992
993/* The console must be locked when we get here. */
994
995static void scc_console_write (struct console *co, const char *str, unsigned count)
996{
997 unsigned long flags;
998
999 local_irq_save(flags);
1000
1001 while (count--)
1002 {
1003 if (*str == '\n')
1004 scc_ch_write ('\r');
1005 scc_ch_write (*str++);
1006 }
1007 local_irq_restore(flags);
1008}
1009
1010static struct tty_driver *scc_console_device(struct console *c, int *index)
1011{
1012 *index = c->index;
1013 return scc_driver;
1014}
1015
1016
1017static int __init scc_console_setup(struct console *co, char *options)
1018{
1019 return 0;
1020}
1021
1022
1023static struct console sercons = {
1024 .name = "ttyS",
1025 .write = scc_console_write,
1026 .device = scc_console_device,
1027 .setup = scc_console_setup,
1028 .flags = CON_PRINTBUFFER,
1029 .index = -1,
1030};
1031
1032
1033static int __init vme_scc_console_init(void)
1034{
1035 if (vme_brdtype == VME_TYPE_MVME147 ||
1036 vme_brdtype == VME_TYPE_MVME162 ||
1037 vme_brdtype == VME_TYPE_MVME172 ||
1038 vme_brdtype == VME_TYPE_BVME4000 ||
1039 vme_brdtype == VME_TYPE_BVME6000)
1040 register_console(&sercons);
1041 return 0;
1042}
1043console_initcall(vme_scc_console_init);
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