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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / char / vme_scc.c
blob19ba83635dd75d6433cf32c521ed929b679eec33
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/config.h>
18 #include <linux/kdev_t.h>
19 #include <asm/io.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/ioport.h>
23 #include <linux/interrupt.h>
24 #include <linux/errno.h>
25 #include <linux/tty.h>
26 #include <linux/tty_flip.h>
27 #include <linux/mm.h>
28 #include <linux/serial.h>
29 #include <linux/fcntl.h>
30 #include <linux/major.h>
31 #include <linux/delay.h>
32 #include <linux/slab.h>
33 #include <linux/miscdevice.h>
34 #include <linux/console.h>
35 #include <linux/init.h>
36 #include <asm/setup.h>
37 #include <asm/bootinfo.h>
38
39 #ifdef CONFIG_MVME147_SCC
40 #include <asm/mvme147hw.h>
41 #endif
42 #ifdef CONFIG_MVME162_SCC
43 #include <asm/mvme16xhw.h>
44 #endif
45 #ifdef CONFIG_BVME6000_SCC
46 #include <asm/bvme6000hw.h>
47 #endif
48
49 #include <linux/generic_serial.h>
50 #include "scc.h"
51
52
53 #define CHANNEL_A 0
54 #define CHANNEL_B 1
55
56 #define SCC_MINOR_BASE 64
57
58 /* Shadows for all SCC write registers */
59 static unsigned char scc_shadow[2][16];
60
61 /* Location to access for SCC register access delay */
62 static volatile unsigned char *scc_del = NULL;
63
64 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
65 static unsigned char scc_last_status_reg[2];
66
67 /***************************** Prototypes *****************************/
68
69 /* Function prototypes */
70 static void scc_disable_tx_interrupts(void * ptr);
71 static void scc_enable_tx_interrupts(void * ptr);
72 static void scc_disable_rx_interrupts(void * ptr);
73 static void scc_enable_rx_interrupts(void * ptr);
74 static int scc_get_CD(void * ptr);
75 static void scc_shutdown_port(void * ptr);
76 static int scc_set_real_termios(void *ptr);
77 static void scc_hungup(void *ptr);
78 static void scc_close(void *ptr);
79 static int scc_chars_in_buffer(void * ptr);
80 static int scc_open(struct tty_struct * tty, struct file * filp);
81 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
82 unsigned int cmd, unsigned long arg);
83 static void scc_throttle(struct tty_struct *tty);
84 static void scc_unthrottle(struct tty_struct *tty);
85 static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp);
86 static irqreturn_t scc_rx_int(int irq, void *data, struct pt_regs *fp);
87 static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp);
88 static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp);
89 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
90 static void scc_break_ctl(struct tty_struct *tty, int break_state);
91
92 static struct tty_driver *scc_driver;
93
94 struct scc_port scc_ports[2];
95
96 int scc_initialized = 0;
97
98 /*---------------------------------------------------------------------------
99 * Interface from generic_serial.c back here
100 *--------------------------------------------------------------------------*/
101
102 static struct real_driver scc_real_driver = {
103 scc_disable_tx_interrupts,
104 scc_enable_tx_interrupts,
105 scc_disable_rx_interrupts,
106 scc_enable_rx_interrupts,
107 scc_get_CD,
108 scc_shutdown_port,
109 scc_set_real_termios,
110 scc_chars_in_buffer,
111 scc_close,
112 scc_hungup,
113 NULL
114 };
115
116
117 static struct tty_operations scc_ops = {
118 .open = scc_open,
119 .close = gs_close,
120 .write = gs_write,
121 .put_char = gs_put_char,
122 .flush_chars = gs_flush_chars,
123 .write_room = gs_write_room,
124 .chars_in_buffer = gs_chars_in_buffer,
125 .flush_buffer = gs_flush_buffer,
126 .ioctl = scc_ioctl,
127 .throttle = scc_throttle,
128 .unthrottle = scc_unthrottle,
129 .set_termios = gs_set_termios,
130 .stop = gs_stop,
131 .start = gs_start,
132 .hangup = gs_hangup,
133 .break_ctl = scc_break_ctl,
134 };
135
136 /*----------------------------------------------------------------------------
137 * vme_scc_init() and support functions
138 *---------------------------------------------------------------------------*/
139
140 static int scc_init_drivers(void)
141 {
142 int error;
143
144 scc_driver = alloc_tty_driver(2);
145 if (!scc_driver)
146 return -ENOMEM;
147 scc_driver->owner = THIS_MODULE;
148 scc_driver->driver_name = "scc";
149 scc_driver->name = "ttyS";
150 scc_driver->devfs_name = "tts/";
151 scc_driver->major = TTY_MAJOR;
152 scc_driver->minor_start = SCC_MINOR_BASE;
153 scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
154 scc_driver->subtype = SERIAL_TYPE_NORMAL;
155 scc_driver->init_termios = tty_std_termios;
156 scc_driver->init_termios.c_cflag =
157 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
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_sem = 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, SA_INTERRUPT,
209 "SCC-A TX", port);
210 request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
211 "SCC-A status", port);
212 request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
213 "SCC-A RX", port);
214 request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, SA_INTERRUPT,
236 "SCC-B TX", port);
237 request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
238 "SCC-B status", port);
239 request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
240 "SCC-B RX", port);
241 request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, SA_INTERRUPT,
279 "SCC-A TX", port);
280 request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
281 "SCC-A status", port);
282 request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
283 "SCC-A RX", port);
284 request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, SA_INTERRUPT,
306 "SCC-B TX", port);
307 request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
308 "SCC-B status", port);
309 request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
310 "SCC-B RX", port);
311 request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, SA_INTERRUPT,
347 "SCC-A TX", port);
348 request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, SA_INTERRUPT,
349 "SCC-A status", port);
350 request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, SA_INTERRUPT,
351 "SCC-A RX", port);
352 request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, SA_INTERRUPT,
374 "SCC-B TX", port);
375 request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, SA_INTERRUPT,
376 "SCC-B status", port);
377 request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, SA_INTERRUPT,
378 "SCC-B RX", port);
379 request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, SA_INTERRUPT,
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, struct pt_regs *fp)
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 if (tty->flip.count < TTY_FLIPBUF_SIZE) {
438 *tty->flip.char_buf_ptr = ch;
439 *tty->flip.flag_buf_ptr = 0;
440 tty->flip.flag_buf_ptr++;
441 tty->flip.char_buf_ptr++;
442 tty->flip.count++;
443 }
444
445 /* Check if another character is already ready; in that case, the
446 * spcond_int() function must be used, because this character may have an
447 * error condition that isn't signalled by the interrupt vector used!
448 */
449 if (SCCread(INT_PENDING_REG) &
450 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
451 scc_spcond_int (irq, data, fp);
452 return IRQ_HANDLED;
453 }
454
455 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
456
457 tty_flip_buffer_push(tty);
458 return IRQ_HANDLED;
459 }
460
461
462 static irqreturn_t scc_spcond_int(int irq, void *data, struct pt_regs *fp)
463 {
464 struct scc_port *port = data;
465 struct tty_struct *tty = port->gs.tty;
466 unsigned char stat, ch, err;
467 int int_pending_mask = port->channel == CHANNEL_A ?
468 IPR_A_RX : IPR_B_RX;
469 SCC_ACCESS_INIT(port);
470
471 if (!tty) {
472 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
473 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
474 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
475 return IRQ_HANDLED;
476 }
477 do {
478 stat = SCCread(SPCOND_STATUS_REG);
479 ch = SCCread_NB(RX_DATA_REG);
480
481 if (stat & SCSR_RX_OVERRUN)
482 err = TTY_OVERRUN;
483 else if (stat & SCSR_PARITY_ERR)
484 err = TTY_PARITY;
485 else if (stat & SCSR_CRC_FRAME_ERR)
486 err = TTY_FRAME;
487 else
488 err = 0;
489
490 if (tty->flip.count < TTY_FLIPBUF_SIZE) {
491 *tty->flip.char_buf_ptr = ch;
492 *tty->flip.flag_buf_ptr = err;
493 tty->flip.flag_buf_ptr++;
494 tty->flip.char_buf_ptr++;
495 tty->flip.count++;
496 }
497
498 /* ++TeSche: *All* errors have to be cleared manually,
499 * else the condition persists for the next chars
500 */
501 if (err)
502 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
503
504 } while(SCCread(INT_PENDING_REG) & int_pending_mask);
505
506 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
507
508 tty_flip_buffer_push(tty);
509 return IRQ_HANDLED;
510 }
511
512
513 static irqreturn_t scc_tx_int(int irq, void *data, struct pt_regs *fp)
514 {
515 struct scc_port *port = data;
516 SCC_ACCESS_INIT(port);
517
518 if (!port->gs.tty) {
519 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
520 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
521 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
522 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
523 return IRQ_HANDLED;
524 }
525 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
526 if (port->x_char) {
527 SCCwrite(TX_DATA_REG, port->x_char);
528 port->x_char = 0;
529 }
530 else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
531 port->gs.tty->hw_stopped)
532 break;
533 else {
534 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
535 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
536 if (--port->gs.xmit_cnt <= 0)
537 break;
538 }
539 }
540 if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
541 port->gs.tty->hw_stopped) {
542 /* disable tx interrupts */
543 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
544 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
545 port->gs.flags &= ~GS_TX_INTEN;
546 }
547 if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
548 tty_wakeup(port->gs.tty);
549
550 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
551 return IRQ_HANDLED;
552 }
553
554
555 static irqreturn_t scc_stat_int(int irq, void *data, struct pt_regs *fp)
556 {
557 struct scc_port *port = data;
558 unsigned channel = port->channel;
559 unsigned char last_sr, sr, changed;
560 SCC_ACCESS_INIT(port);
561
562 last_sr = scc_last_status_reg[channel];
563 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
564 changed = last_sr ^ sr;
565
566 if (changed & SR_DCD) {
567 port->c_dcd = !!(sr & SR_DCD);
568 if (!(port->gs.flags & ASYNC_CHECK_CD))
569 ; /* Don't report DCD changes */
570 else if (port->c_dcd) {
571 wake_up_interruptible(&port->gs.open_wait);
572 }
573 else {
574 if (port->gs.tty)
575 tty_hangup (port->gs.tty);
576 }
577 }
578 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
579 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
580 return IRQ_HANDLED;
581 }
582
583
584 /*---------------------------------------------------------------------------
585 * generic_serial.c callback funtions
586 *--------------------------------------------------------------------------*/
587
588 static void scc_disable_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, ~IDR_TX_INT_ENAB, 0);
596 port->gs.flags &= ~GS_TX_INTEN;
597 local_irq_restore(flags);
598 }
599
600
601 static void scc_enable_tx_interrupts(void *ptr)
602 {
603 struct scc_port *port = ptr;
604 unsigned long flags;
605 SCC_ACCESS_INIT(port);
606
607 local_irq_save(flags);
608 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
609 /* restart the transmitter */
610 scc_tx_int (0, port, 0);
611 local_irq_restore(flags);
612 }
613
614
615 static void scc_disable_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,
623 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
624 local_irq_restore(flags);
625 }
626
627
628 static void scc_enable_rx_interrupts(void *ptr)
629 {
630 struct scc_port *port = ptr;
631 unsigned long flags;
632 SCC_ACCESS_INIT(port);
633
634 local_irq_save(flags);
635 SCCmod(INT_AND_DMA_REG, 0xff,
636 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
637 local_irq_restore(flags);
638 }
639
640
641 static int scc_get_CD(void *ptr)
642 {
643 struct scc_port *port = ptr;
644 unsigned channel = port->channel;
645
646 return !!(scc_last_status_reg[channel] & SR_DCD);
647 }
648
649
650 static void scc_shutdown_port(void *ptr)
651 {
652 struct scc_port *port = ptr;
653
654 port->gs.flags &= ~ GS_ACTIVE;
655 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
656 scc_setsignals (port, 0, 0);
657 }
658 }
659
660
661 static int scc_set_real_termios (void *ptr)
662 {
663 /* the SCC has char sizes 5,7,6,8 in that order! */
664 static int chsize_map[4] = { 0, 2, 1, 3 };
665 unsigned cflag, baud, chsize, channel, brgval = 0;
666 unsigned long flags;
667 struct scc_port *port = ptr;
668 SCC_ACCESS_INIT(port);
669
670 if (!port->gs.tty || !port->gs.tty->termios) return 0;
671
672 channel = port->channel;
673
674 if (channel == CHANNEL_A)
675 return 0; /* Settings controlled by boot PROM */
676
677 cflag = port->gs.tty->termios->c_cflag;
678 baud = port->gs.baud;
679 chsize = (cflag & CSIZE) >> 4;
680
681 if (baud == 0) {
682 /* speed == 0 -> drop DTR */
683 local_irq_save(flags);
684 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
685 local_irq_restore(flags);
686 return 0;
687 }
688 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
689 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
690 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
691 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
692 return 0;
693 }
694
695 if (cflag & CLOCAL)
696 port->gs.flags &= ~ASYNC_CHECK_CD;
697 else
698 port->gs.flags |= ASYNC_CHECK_CD;
699
700 #ifdef CONFIG_MVME147_SCC
701 if (MACH_IS_MVME147)
702 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
703 #endif
704 #ifdef CONFIG_MVME162_SCC
705 if (MACH_IS_MVME16x)
706 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
707 #endif
708 #ifdef CONFIG_BVME6000_SCC
709 if (MACH_IS_BVME6000)
710 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
711 #endif
712 /* Now we have all parameters and can go to set them: */
713 local_irq_save(flags);
714
715 /* receiver's character size and auto-enables */
716 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
717 (chsize_map[chsize] << 6) |
718 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
719 /* parity and stop bits (both, Tx and Rx), clock mode never changes */
720 SCCmod (AUX1_CTRL_REG,
721 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
722 ((cflag & PARENB
723 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
724 : A1CR_PARITY_NONE)
725 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
726 /* sender's character size, set DTR for valid baud rate */
727 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
728 /* clock sources never change */
729 /* disable BRG before changing the value */
730 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
731 /* BRG value */
732 SCCwrite(TIMER_LOW_REG, brgval & 0xff);
733 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
734 /* BRG enable, and clock source never changes */
735 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
736
737 local_irq_restore(flags);
738
739 return 0;
740 }
741
742
743 static int scc_chars_in_buffer (void *ptr)
744 {
745 struct scc_port *port = ptr;
746 SCC_ACCESS_INIT(port);
747
748 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
749 }
750
751
752 /* Comment taken from sx.c (2.4.0):
753 I haven't the foggiest why the decrement use count has to happen
754 here. The whole linux serial drivers stuff needs to be redesigned.
755 My guess is that this is a hack to minimize the impact of a bug
756 elsewhere. Thinking about it some more. (try it sometime) Try
757 running minicom on a serial port that is driven by a modularized
758 driver. Have the modem hangup. Then remove the driver module. Then
759 exit minicom. I expect an "oops". -- REW */
760
761 static void scc_hungup(void *ptr)
762 {
763 scc_disable_tx_interrupts(ptr);
764 scc_disable_rx_interrupts(ptr);
765 }
766
767
768 static void scc_close(void *ptr)
769 {
770 scc_disable_tx_interrupts(ptr);
771 scc_disable_rx_interrupts(ptr);
772 }
773
774
775 /*---------------------------------------------------------------------------
776 * Internal support functions
777 *--------------------------------------------------------------------------*/
778
779 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
780 {
781 unsigned long flags;
782 unsigned char t;
783 SCC_ACCESS_INIT(port);
784
785 local_irq_save(flags);
786 t = SCCread(TX_CTRL_REG);
787 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
788 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
789 SCCwrite(TX_CTRL_REG, t);
790 local_irq_restore(flags);
791 }
792
793
794 static void scc_send_xchar(struct tty_struct *tty, char ch)
795 {
796 struct scc_port *port = (struct scc_port *)tty->driver_data;
797
798 port->x_char = ch;
799 if (ch)
800 scc_enable_tx_interrupts(port);
801 }
802
803
804 /*---------------------------------------------------------------------------
805 * Driver entrypoints referenced from above
806 *--------------------------------------------------------------------------*/
807
808 static int scc_open (struct tty_struct * tty, struct file * filp)
809 {
810 int line = tty->index;
811 int retval;
812 struct scc_port *port = &scc_ports[line];
813 int i, channel = port->channel;
814 unsigned long flags;
815 SCC_ACCESS_INIT(port);
816 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
817 static const struct {
818 unsigned reg, val;
819 } mvme_init_tab[] = {
820 /* Values for MVME162 and MVME147 */
821 /* no parity, 1 stop bit, async, 1:16 */
822 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
823 /* parity error is special cond, ints disabled, no DMA */
824 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
825 /* Rx 8 bits/char, no auto enable, Rx off */
826 { RX_CTRL_REG, RCR_CHSIZE_8 },
827 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
828 { TX_CTRL_REG, TCR_CHSIZE_8 },
829 /* special features off */
830 { AUX2_CTRL_REG, 0 },
831 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
832 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
833 /* Start Rx */
834 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
835 /* Start Tx */
836 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
837 /* Ext/Stat ints: DCD only */
838 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
839 /* Reset Ext/Stat ints */
840 { COMMAND_REG, CR_EXTSTAT_RESET },
841 /* ...again */
842 { COMMAND_REG, CR_EXTSTAT_RESET },
843 };
844 #endif
845 #if defined(CONFIG_BVME6000_SCC)
846 static const struct {
847 unsigned reg, val;
848 } bvme_init_tab[] = {
849 /* Values for BVME6000 */
850 /* no parity, 1 stop bit, async, 1:16 */
851 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
852 /* parity error is special cond, ints disabled, no DMA */
853 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
854 /* Rx 8 bits/char, no auto enable, Rx off */
855 { RX_CTRL_REG, RCR_CHSIZE_8 },
856 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
857 { TX_CTRL_REG, TCR_CHSIZE_8 },
858 /* special features off */
859 { AUX2_CTRL_REG, 0 },
860 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
861 { DPLL_CTRL_REG, DCR_BRG_ENAB },
862 /* Start Rx */
863 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
864 /* Start Tx */
865 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
866 /* Ext/Stat ints: DCD only */
867 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
868 /* Reset Ext/Stat ints */
869 { COMMAND_REG, CR_EXTSTAT_RESET },
870 /* ...again */
871 { COMMAND_REG, CR_EXTSTAT_RESET },
872 };
873 #endif
874 if (!(port->gs.flags & ASYNC_INITIALIZED)) {
875 local_irq_save(flags);
876 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
877 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
878 for (i=0; i<sizeof(mvme_init_tab)/sizeof(*mvme_init_tab); ++i)
879 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
880 }
881 #endif
882 #if defined(CONFIG_BVME6000_SCC)
883 if (MACH_IS_BVME6000) {
884 for (i=0; i<sizeof(bvme_init_tab)/sizeof(*bvme_init_tab); ++i)
885 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
886 }
887 #endif
888
889 /* remember status register for detection of DCD and CTS changes */
890 scc_last_status_reg[channel] = SCCread(STATUS_REG);
891
892 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
893 scc_setsignals (port, 1,1);
894 local_irq_restore(flags);
895 }
896
897 tty->driver_data = port;
898 port->gs.tty = tty;
899 port->gs.count++;
900 retval = gs_init_port(&port->gs);
901 if (retval) {
902 port->gs.count--;
903 return retval;
904 }
905 port->gs.flags |= GS_ACTIVE;
906 retval = gs_block_til_ready(port, filp);
907
908 if (retval) {
909 port->gs.count--;
910 return retval;
911 }
912
913 port->c_dcd = scc_get_CD (port);
914
915 scc_enable_rx_interrupts(port);
916
917 return 0;
918 }
919
920
921 static void scc_throttle (struct tty_struct * tty)
922 {
923 struct scc_port *port = (struct scc_port *)tty->driver_data;
924 unsigned long flags;
925 SCC_ACCESS_INIT(port);
926
927 if (tty->termios->c_cflag & CRTSCTS) {
928 local_irq_save(flags);
929 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
930 local_irq_restore(flags);
931 }
932 if (I_IXOFF(tty))
933 scc_send_xchar(tty, STOP_CHAR(tty));
934 }
935
936
937 static void scc_unthrottle (struct tty_struct * tty)
938 {
939 struct scc_port *port = (struct scc_port *)tty->driver_data;
940 unsigned long flags;
941 SCC_ACCESS_INIT(port);
942
943 if (tty->termios->c_cflag & CRTSCTS) {
944 local_irq_save(flags);
945 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
946 local_irq_restore(flags);
947 }
948 if (I_IXOFF(tty))
949 scc_send_xchar(tty, START_CHAR(tty));
950 }
951
952
953 static int scc_ioctl(struct tty_struct *tty, struct file *file,
954 unsigned int cmd, unsigned long arg)
955 {
956 return -ENOIOCTLCMD;
957 }
958
959
960 static void scc_break_ctl(struct tty_struct *tty, int break_state)
961 {
962 struct scc_port *port = (struct scc_port *)tty->driver_data;
963 unsigned long flags;
964 SCC_ACCESS_INIT(port);
965
966 local_irq_save(flags);
967 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
968 break_state ? TCR_SEND_BREAK : 0);
969 local_irq_restore(flags);
970 }
971
972
973 /*---------------------------------------------------------------------------
974 * Serial console stuff...
975 *--------------------------------------------------------------------------*/
976
977 #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
978
979 static void scc_ch_write (char ch)
980 {
981 volatile char *p = NULL;
982
983 #ifdef CONFIG_MVME147_SCC
984 if (MACH_IS_MVME147)
985 p = (volatile char *)M147_SCC_A_ADDR;
986 #endif
987 #ifdef CONFIG_MVME162_SCC
988 if (MACH_IS_MVME16x)
989 p = (volatile char *)MVME_SCC_A_ADDR;
990 #endif
991 #ifdef CONFIG_BVME6000_SCC
992 if (MACH_IS_BVME6000)
993 p = (volatile char *)BVME_SCC_A_ADDR;
994 #endif
995
996 do {
997 scc_delay();
998 }
999 while (!(*p & 4));
1000 scc_delay();
1001 *p = 8;
1002 scc_delay();
1003 *p = ch;
1004 }
1005
1006 /* The console must be locked when we get here. */
1007
1008 static void scc_console_write (struct console *co, const char *str, unsigned count)
1009 {
1010 unsigned long flags;
1011
1012 local_irq_save(flags);
1013
1014 while (count--)
1015 {
1016 if (*str == '\n')
1017 scc_ch_write ('\r');
1018 scc_ch_write (*str++);
1019 }
1020 local_irq_restore(flags);
1021 }
1022
1023 static struct tty_driver *scc_console_device(struct console *c, int *index)
1024 {
1025 *index = c->index;
1026 return scc_driver;
1027 }
1028
1029
1030 static int __init scc_console_setup(struct console *co, char *options)
1031 {
1032 return 0;
1033 }
1034
1035
1036 static struct console sercons = {
1037 .name = "ttyS",
1038 .write = scc_console_write,
1039 .device = scc_console_device,
1040 .setup = scc_console_setup,
1041 .flags = CON_PRINTBUFFER,
1042 .index = -1,
1043 };
1044
1045
1046 static int __init vme_scc_console_init(void)
1047 {
1048 if (vme_brdtype == VME_TYPE_MVME147 ||
1049 vme_brdtype == VME_TYPE_MVME162 ||
1050 vme_brdtype == VME_TYPE_MVME172 ||
1051 vme_brdtype == VME_TYPE_BVME4000 ||
1052 vme_brdtype == VME_TYPE_BVME6000)
1053 register_console(&sercons);
1054 return 0;
1055 }
1056 console_initcall(vme_scc_console_init);
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