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intel-gtt: maximize ggtt size on platforms that support this
[linux/fpc-iii.git] / drivers / char / vme_scc.c
blob12de1202d22cc5b02dabd7362864d5120741cefc
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/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/miscdevice.h>
31 #include <linux/console.h>
32 #include <linux/init.h>
33 #include <asm/setup.h>
34 #include <asm/bootinfo.h>
35
36 #ifdef CONFIG_MVME147_SCC
37 #include <asm/mvme147hw.h>
38 #endif
39 #ifdef CONFIG_MVME162_SCC
40 #include <asm/mvme16xhw.h>
41 #endif
42 #ifdef CONFIG_BVME6000_SCC
43 #include <asm/bvme6000hw.h>
44 #endif
45
46 #include <linux/generic_serial.h>
47 #include "scc.h"
48
49
50 #define CHANNEL_A 0
51 #define CHANNEL_B 1
52
53 #define SCC_MINOR_BASE 64
54
55 /* Shadows for all SCC write registers */
56 static unsigned char scc_shadow[2][16];
57
58 /* Location to access for SCC register access delay */
59 static volatile unsigned char *scc_del = NULL;
60
61 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
62 static unsigned char scc_last_status_reg[2];
63
64 /***************************** Prototypes *****************************/
65
66 /* Function prototypes */
67 static void scc_disable_tx_interrupts(void * ptr);
68 static void scc_enable_tx_interrupts(void * ptr);
69 static void scc_disable_rx_interrupts(void * ptr);
70 static void scc_enable_rx_interrupts(void * ptr);
71 static int scc_carrier_raised(struct tty_port *port);
72 static void scc_shutdown_port(void * ptr);
73 static int scc_set_real_termios(void *ptr);
74 static void scc_hungup(void *ptr);
75 static void scc_close(void *ptr);
76 static int scc_chars_in_buffer(void * ptr);
77 static int scc_open(struct tty_struct * tty, struct file * filp);
78 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
79 unsigned int cmd, unsigned long arg);
80 static void scc_throttle(struct tty_struct *tty);
81 static void scc_unthrottle(struct tty_struct *tty);
82 static irqreturn_t scc_tx_int(int irq, void *data);
83 static irqreturn_t scc_rx_int(int irq, void *data);
84 static irqreturn_t scc_stat_int(int irq, void *data);
85 static irqreturn_t scc_spcond_int(int irq, void *data);
86 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
87 static int scc_break_ctl(struct tty_struct *tty, int break_state);
88
89 static struct tty_driver *scc_driver;
90
91 static struct scc_port scc_ports[2];
92
93 /*---------------------------------------------------------------------------
94 * Interface from generic_serial.c back here
95 *--------------------------------------------------------------------------*/
96
97 static struct real_driver scc_real_driver = {
98 scc_disable_tx_interrupts,
99 scc_enable_tx_interrupts,
100 scc_disable_rx_interrupts,
101 scc_enable_rx_interrupts,
102 scc_shutdown_port,
103 scc_set_real_termios,
104 scc_chars_in_buffer,
105 scc_close,
106 scc_hungup,
107 NULL
108 };
109
110
111 static const struct tty_operations scc_ops = {
112 .open = scc_open,
113 .close = gs_close,
114 .write = gs_write,
115 .put_char = gs_put_char,
116 .flush_chars = gs_flush_chars,
117 .write_room = gs_write_room,
118 .chars_in_buffer = gs_chars_in_buffer,
119 .flush_buffer = gs_flush_buffer,
120 .ioctl = scc_ioctl,
121 .throttle = scc_throttle,
122 .unthrottle = scc_unthrottle,
123 .set_termios = gs_set_termios,
124 .stop = gs_stop,
125 .start = gs_start,
126 .hangup = gs_hangup,
127 .break_ctl = scc_break_ctl,
128 };
129
130 static const struct tty_port_operations scc_port_ops = {
131 .carrier_raised = scc_carrier_raised,
132 };
133
134 /*----------------------------------------------------------------------------
135 * vme_scc_init() and support functions
136 *---------------------------------------------------------------------------*/
137
138 static int __init 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";
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;
155 scc_driver->init_termios.c_ispeed = 9600;
156 scc_driver->init_termios.c_ospeed = 9600;
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
174 static void __init 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 tty_port_init(&port->gs.port);
182 port->gs.port.ops = &scc_port_ops;
183 port->gs.magic = SCC_MAGIC;
184 port->gs.close_delay = HZ/2;
185 port->gs.closing_wait = 30 * HZ;
186 port->gs.rd = &scc_real_driver;
187 #ifdef NEW_WRITE_LOCKING
188 port->gs.port_write_mutex = MUTEX;
189 #endif
190 init_waitqueue_head(&port->gs.port.open_wait);
191 init_waitqueue_head(&port->gs.port.close_wait);
192 }
193 }
194
195
196 #ifdef CONFIG_MVME147_SCC
197 static int __init mvme147_scc_init(void)
198 {
199 struct scc_port *port;
200 int error;
201
202 printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
203 /* Init channel A */
204 port = &scc_ports[0];
205 port->channel = CHANNEL_A;
206 port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
207 port->datap = port->ctrlp + 1;
208 port->port_a = &scc_ports[0];
209 port->port_b = &scc_ports[1];
210 error = request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
211 "SCC-A TX", port);
212 if (error)
213 goto fail;
214 error = request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
215 "SCC-A status", port);
216 if (error)
217 goto fail_free_a_tx;
218 error = request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
219 "SCC-A RX", port);
220 if (error)
221 goto fail_free_a_stat;
222 error = request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int,
223 IRQF_DISABLED, "SCC-A special cond", port);
224 if (error)
225 goto fail_free_a_rx;
226
227 {
228 SCC_ACCESS_INIT(port);
229
230 /* disable interrupts for this channel */
231 SCCwrite(INT_AND_DMA_REG, 0);
232 /* Set the interrupt vector */
233 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
234 /* Interrupt parameters: vector includes status, status low */
235 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
236 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
237 }
238
239 /* Init channel B */
240 port = &scc_ports[1];
241 port->channel = CHANNEL_B;
242 port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
243 port->datap = port->ctrlp + 1;
244 port->port_a = &scc_ports[0];
245 port->port_b = &scc_ports[1];
246 error = request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
247 "SCC-B TX", port);
248 if (error)
249 goto fail_free_a_spcond;
250 error = request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
251 "SCC-B status", port);
252 if (error)
253 goto fail_free_b_tx;
254 error = request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
255 "SCC-B RX", port);
256 if (error)
257 goto fail_free_b_stat;
258 error = request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int,
259 IRQF_DISABLED, "SCC-B special cond", port);
260 if (error)
261 goto fail_free_b_rx;
262
263 {
264 SCC_ACCESS_INIT(port);
265
266 /* disable interrupts for this channel */
267 SCCwrite(INT_AND_DMA_REG, 0);
268 }
269
270 /* Ensure interrupts are enabled in the PCC chip */
271 m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
272
273 /* Initialise the tty driver structures and register */
274 scc_init_portstructs();
275 scc_init_drivers();
276
277 return 0;
278
279 fail_free_b_rx:
280 free_irq(MVME147_IRQ_SCCB_RX, port);
281 fail_free_b_stat:
282 free_irq(MVME147_IRQ_SCCB_STAT, port);
283 fail_free_b_tx:
284 free_irq(MVME147_IRQ_SCCB_TX, port);
285 fail_free_a_spcond:
286 free_irq(MVME147_IRQ_SCCA_SPCOND, port);
287 fail_free_a_rx:
288 free_irq(MVME147_IRQ_SCCA_RX, port);
289 fail_free_a_stat:
290 free_irq(MVME147_IRQ_SCCA_STAT, port);
291 fail_free_a_tx:
292 free_irq(MVME147_IRQ_SCCA_TX, port);
293 fail:
294 return error;
295 }
296 #endif
297
298
299 #ifdef CONFIG_MVME162_SCC
300 static int __init mvme162_scc_init(void)
301 {
302 struct scc_port *port;
303 int error;
304
305 if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
306 return (-ENODEV);
307
308 printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
309 /* Init channel A */
310 port = &scc_ports[0];
311 port->channel = CHANNEL_A;
312 port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
313 port->datap = port->ctrlp + 2;
314 port->port_a = &scc_ports[0];
315 port->port_b = &scc_ports[1];
316 error = request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
317 "SCC-A TX", port);
318 if (error)
319 goto fail;
320 error = request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
321 "SCC-A status", port);
322 if (error)
323 goto fail_free_a_tx;
324 error = request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
325 "SCC-A RX", port);
326 if (error)
327 goto fail_free_a_stat;
328 error = request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int,
329 IRQF_DISABLED, "SCC-A special cond", port);
330 if (error)
331 goto fail_free_a_rx;
332
333 {
334 SCC_ACCESS_INIT(port);
335
336 /* disable interrupts for this channel */
337 SCCwrite(INT_AND_DMA_REG, 0);
338 /* Set the interrupt vector */
339 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
340 /* Interrupt parameters: vector includes status, status low */
341 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
342 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
343 }
344
345 /* Init channel B */
346 port = &scc_ports[1];
347 port->channel = CHANNEL_B;
348 port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
349 port->datap = port->ctrlp + 2;
350 port->port_a = &scc_ports[0];
351 port->port_b = &scc_ports[1];
352 error = request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
353 "SCC-B TX", port);
354 if (error)
355 goto fail_free_a_spcond;
356 error = request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
357 "SCC-B status", port);
358 if (error)
359 goto fail_free_b_tx;
360 error = request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
361 "SCC-B RX", port);
362 if (error)
363 goto fail_free_b_stat;
364 error = request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int,
365 IRQF_DISABLED, "SCC-B special cond", port);
366 if (error)
367 goto fail_free_b_rx;
368
369 {
370 SCC_ACCESS_INIT(port); /* Either channel will do */
371
372 /* disable interrupts for this channel */
373 SCCwrite(INT_AND_DMA_REG, 0);
374 }
375
376 /* Ensure interrupts are enabled in the MC2 chip */
377 *(volatile char *)0xfff4201d = 0x14;
378
379 /* Initialise the tty driver structures and register */
380 scc_init_portstructs();
381 scc_init_drivers();
382
383 return 0;
384
385 fail_free_b_rx:
386 free_irq(MVME162_IRQ_SCCB_RX, port);
387 fail_free_b_stat:
388 free_irq(MVME162_IRQ_SCCB_STAT, port);
389 fail_free_b_tx:
390 free_irq(MVME162_IRQ_SCCB_TX, port);
391 fail_free_a_spcond:
392 free_irq(MVME162_IRQ_SCCA_SPCOND, port);
393 fail_free_a_rx:
394 free_irq(MVME162_IRQ_SCCA_RX, port);
395 fail_free_a_stat:
396 free_irq(MVME162_IRQ_SCCA_STAT, port);
397 fail_free_a_tx:
398 free_irq(MVME162_IRQ_SCCA_TX, port);
399 fail:
400 return error;
401 }
402 #endif
403
404
405 #ifdef CONFIG_BVME6000_SCC
406 static int __init bvme6000_scc_init(void)
407 {
408 struct scc_port *port;
409 int error;
410
411 printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
412 /* Init channel A */
413 port = &scc_ports[0];
414 port->channel = CHANNEL_A;
415 port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
416 port->datap = port->ctrlp + 4;
417 port->port_a = &scc_ports[0];
418 port->port_b = &scc_ports[1];
419 error = request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
420 "SCC-A TX", port);
421 if (error)
422 goto fail;
423 error = request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
424 "SCC-A status", port);
425 if (error)
426 goto fail_free_a_tx;
427 error = request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
428 "SCC-A RX", port);
429 if (error)
430 goto fail_free_a_stat;
431 error = request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int,
432 IRQF_DISABLED, "SCC-A special cond", port);
433 if (error)
434 goto fail_free_a_rx;
435
436 {
437 SCC_ACCESS_INIT(port);
438
439 /* disable interrupts for this channel */
440 SCCwrite(INT_AND_DMA_REG, 0);
441 /* Set the interrupt vector */
442 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
443 /* Interrupt parameters: vector includes status, status low */
444 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
445 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
446 }
447
448 /* Init channel B */
449 port = &scc_ports[1];
450 port->channel = CHANNEL_B;
451 port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
452 port->datap = port->ctrlp + 4;
453 port->port_a = &scc_ports[0];
454 port->port_b = &scc_ports[1];
455 error = request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
456 "SCC-B TX", port);
457 if (error)
458 goto fail_free_a_spcond;
459 error = request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
460 "SCC-B status", port);
461 if (error)
462 goto fail_free_b_tx;
463 error = request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
464 "SCC-B RX", port);
465 if (error)
466 goto fail_free_b_stat;
467 error = request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int,
468 IRQF_DISABLED, "SCC-B special cond", port);
469 if (error)
470 goto fail_free_b_rx;
471
472 {
473 SCC_ACCESS_INIT(port); /* Either channel will do */
474
475 /* disable interrupts for this channel */
476 SCCwrite(INT_AND_DMA_REG, 0);
477 }
478
479 /* Initialise the tty driver structures and register */
480 scc_init_portstructs();
481 scc_init_drivers();
482
483 return 0;
484
485 fail:
486 free_irq(BVME_IRQ_SCCA_STAT, port);
487 fail_free_a_tx:
488 free_irq(BVME_IRQ_SCCA_RX, port);
489 fail_free_a_stat:
490 free_irq(BVME_IRQ_SCCA_SPCOND, port);
491 fail_free_a_rx:
492 free_irq(BVME_IRQ_SCCB_TX, port);
493 fail_free_a_spcond:
494 free_irq(BVME_IRQ_SCCB_STAT, port);
495 fail_free_b_tx:
496 free_irq(BVME_IRQ_SCCB_RX, port);
497 fail_free_b_stat:
498 free_irq(BVME_IRQ_SCCB_SPCOND, port);
499 fail_free_b_rx:
500 return error;
501 }
502 #endif
503
504
505 static int __init vme_scc_init(void)
506 {
507 int res = -ENODEV;
508
509 #ifdef CONFIG_MVME147_SCC
510 if (MACH_IS_MVME147)
511 res = mvme147_scc_init();
512 #endif
513 #ifdef CONFIG_MVME162_SCC
514 if (MACH_IS_MVME16x)
515 res = mvme162_scc_init();
516 #endif
517 #ifdef CONFIG_BVME6000_SCC
518 if (MACH_IS_BVME6000)
519 res = bvme6000_scc_init();
520 #endif
521 return res;
522 }
523
524 module_init(vme_scc_init);
525
526
527 /*---------------------------------------------------------------------------
528 * Interrupt handlers
529 *--------------------------------------------------------------------------*/
530
531 static irqreturn_t scc_rx_int(int irq, void *data)
532 {
533 unsigned char ch;
534 struct scc_port *port = data;
535 struct tty_struct *tty = port->gs.port.tty;
536 SCC_ACCESS_INIT(port);
537
538 ch = SCCread_NB(RX_DATA_REG);
539 if (!tty) {
540 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
541 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
542 return IRQ_HANDLED;
543 }
544 tty_insert_flip_char(tty, ch, 0);
545
546 /* Check if another character is already ready; in that case, the
547 * spcond_int() function must be used, because this character may have an
548 * error condition that isn't signalled by the interrupt vector used!
549 */
550 if (SCCread(INT_PENDING_REG) &
551 (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
552 scc_spcond_int (irq, data);
553 return IRQ_HANDLED;
554 }
555
556 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
557
558 tty_flip_buffer_push(tty);
559 return IRQ_HANDLED;
560 }
561
562
563 static irqreturn_t scc_spcond_int(int irq, void *data)
564 {
565 struct scc_port *port = data;
566 struct tty_struct *tty = port->gs.port.tty;
567 unsigned char stat, ch, err;
568 int int_pending_mask = port->channel == CHANNEL_A ?
569 IPR_A_RX : IPR_B_RX;
570 SCC_ACCESS_INIT(port);
571
572 if (!tty) {
573 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
574 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
575 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
576 return IRQ_HANDLED;
577 }
578 do {
579 stat = SCCread(SPCOND_STATUS_REG);
580 ch = SCCread_NB(RX_DATA_REG);
581
582 if (stat & SCSR_RX_OVERRUN)
583 err = TTY_OVERRUN;
584 else if (stat & SCSR_PARITY_ERR)
585 err = TTY_PARITY;
586 else if (stat & SCSR_CRC_FRAME_ERR)
587 err = TTY_FRAME;
588 else
589 err = 0;
590
591 tty_insert_flip_char(tty, ch, err);
592
593 /* ++TeSche: *All* errors have to be cleared manually,
594 * else the condition persists for the next chars
595 */
596 if (err)
597 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
598
599 } while(SCCread(INT_PENDING_REG) & int_pending_mask);
600
601 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
602
603 tty_flip_buffer_push(tty);
604 return IRQ_HANDLED;
605 }
606
607
608 static irqreturn_t scc_tx_int(int irq, void *data)
609 {
610 struct scc_port *port = data;
611 SCC_ACCESS_INIT(port);
612
613 if (!port->gs.port.tty) {
614 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
615 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
616 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
617 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
618 return IRQ_HANDLED;
619 }
620 while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
621 if (port->x_char) {
622 SCCwrite(TX_DATA_REG, port->x_char);
623 port->x_char = 0;
624 }
625 else if ((port->gs.xmit_cnt <= 0) ||
626 port->gs.port.tty->stopped ||
627 port->gs.port.tty->hw_stopped)
628 break;
629 else {
630 SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
631 port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
632 if (--port->gs.xmit_cnt <= 0)
633 break;
634 }
635 }
636 if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped ||
637 port->gs.port.tty->hw_stopped) {
638 /* disable tx interrupts */
639 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
640 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
641 port->gs.port.flags &= ~GS_TX_INTEN;
642 }
643 if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
644 tty_wakeup(port->gs.port.tty);
645
646 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
647 return IRQ_HANDLED;
648 }
649
650
651 static irqreturn_t scc_stat_int(int irq, void *data)
652 {
653 struct scc_port *port = data;
654 unsigned channel = port->channel;
655 unsigned char last_sr, sr, changed;
656 SCC_ACCESS_INIT(port);
657
658 last_sr = scc_last_status_reg[channel];
659 sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
660 changed = last_sr ^ sr;
661
662 if (changed & SR_DCD) {
663 port->c_dcd = !!(sr & SR_DCD);
664 if (!(port->gs.port.flags & ASYNC_CHECK_CD))
665 ; /* Don't report DCD changes */
666 else if (port->c_dcd) {
667 wake_up_interruptible(&port->gs.port.open_wait);
668 }
669 else {
670 if (port->gs.port.tty)
671 tty_hangup (port->gs.port.tty);
672 }
673 }
674 SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
675 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
676 return IRQ_HANDLED;
677 }
678
679
680 /*---------------------------------------------------------------------------
681 * generic_serial.c callback funtions
682 *--------------------------------------------------------------------------*/
683
684 static void scc_disable_tx_interrupts(void *ptr)
685 {
686 struct scc_port *port = ptr;
687 unsigned long flags;
688 SCC_ACCESS_INIT(port);
689
690 local_irq_save(flags);
691 SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
692 port->gs.port.flags &= ~GS_TX_INTEN;
693 local_irq_restore(flags);
694 }
695
696
697 static void scc_enable_tx_interrupts(void *ptr)
698 {
699 struct scc_port *port = ptr;
700 unsigned long flags;
701 SCC_ACCESS_INIT(port);
702
703 local_irq_save(flags);
704 SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
705 /* restart the transmitter */
706 scc_tx_int (0, port);
707 local_irq_restore(flags);
708 }
709
710
711 static void scc_disable_rx_interrupts(void *ptr)
712 {
713 struct scc_port *port = ptr;
714 unsigned long flags;
715 SCC_ACCESS_INIT(port);
716
717 local_irq_save(flags);
718 SCCmod(INT_AND_DMA_REG,
719 ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
720 local_irq_restore(flags);
721 }
722
723
724 static void scc_enable_rx_interrupts(void *ptr)
725 {
726 struct scc_port *port = ptr;
727 unsigned long flags;
728 SCC_ACCESS_INIT(port);
729
730 local_irq_save(flags);
731 SCCmod(INT_AND_DMA_REG, 0xff,
732 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
733 local_irq_restore(flags);
734 }
735
736
737 static int scc_carrier_raised(struct tty_port *port)
738 {
739 struct scc_port *sc = container_of(port, struct scc_port, gs.port);
740 unsigned channel = sc->channel;
741
742 return !!(scc_last_status_reg[channel] & SR_DCD);
743 }
744
745
746 static void scc_shutdown_port(void *ptr)
747 {
748 struct scc_port *port = ptr;
749
750 port->gs.port.flags &= ~ GS_ACTIVE;
751 if (port->gs.port.tty && (port->gs.port.tty->termios->c_cflag & HUPCL)) {
752 scc_setsignals (port, 0, 0);
753 }
754 }
755
756
757 static int scc_set_real_termios (void *ptr)
758 {
759 /* the SCC has char sizes 5,7,6,8 in that order! */
760 static int chsize_map[4] = { 0, 2, 1, 3 };
761 unsigned cflag, baud, chsize, channel, brgval = 0;
762 unsigned long flags;
763 struct scc_port *port = ptr;
764 SCC_ACCESS_INIT(port);
765
766 if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0;
767
768 channel = port->channel;
769
770 if (channel == CHANNEL_A)
771 return 0; /* Settings controlled by boot PROM */
772
773 cflag = port->gs.port.tty->termios->c_cflag;
774 baud = port->gs.baud;
775 chsize = (cflag & CSIZE) >> 4;
776
777 if (baud == 0) {
778 /* speed == 0 -> drop DTR */
779 local_irq_save(flags);
780 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
781 local_irq_restore(flags);
782 return 0;
783 }
784 else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
785 (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
786 (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
787 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
788 return 0;
789 }
790
791 if (cflag & CLOCAL)
792 port->gs.port.flags &= ~ASYNC_CHECK_CD;
793 else
794 port->gs.port.flags |= ASYNC_CHECK_CD;
795
796 #ifdef CONFIG_MVME147_SCC
797 if (MACH_IS_MVME147)
798 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
799 #endif
800 #ifdef CONFIG_MVME162_SCC
801 if (MACH_IS_MVME16x)
802 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
803 #endif
804 #ifdef CONFIG_BVME6000_SCC
805 if (MACH_IS_BVME6000)
806 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
807 #endif
808 /* Now we have all parameters and can go to set them: */
809 local_irq_save(flags);
810
811 /* receiver's character size and auto-enables */
812 SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
813 (chsize_map[chsize] << 6) |
814 ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
815 /* parity and stop bits (both, Tx and Rx), clock mode never changes */
816 SCCmod (AUX1_CTRL_REG,
817 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
818 ((cflag & PARENB
819 ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
820 : A1CR_PARITY_NONE)
821 | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
822 /* sender's character size, set DTR for valid baud rate */
823 SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
824 /* clock sources never change */
825 /* disable BRG before changing the value */
826 SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
827 /* BRG value */
828 SCCwrite(TIMER_LOW_REG, brgval & 0xff);
829 SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
830 /* BRG enable, and clock source never changes */
831 SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
832
833 local_irq_restore(flags);
834
835 return 0;
836 }
837
838
839 static int scc_chars_in_buffer (void *ptr)
840 {
841 struct scc_port *port = ptr;
842 SCC_ACCESS_INIT(port);
843
844 return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
845 }
846
847
848 /* Comment taken from sx.c (2.4.0):
849 I haven't the foggiest why the decrement use count has to happen
850 here. The whole linux serial drivers stuff needs to be redesigned.
851 My guess is that this is a hack to minimize the impact of a bug
852 elsewhere. Thinking about it some more. (try it sometime) Try
853 running minicom on a serial port that is driven by a modularized
854 driver. Have the modem hangup. Then remove the driver module. Then
855 exit minicom. I expect an "oops". -- REW */
856
857 static void scc_hungup(void *ptr)
858 {
859 scc_disable_tx_interrupts(ptr);
860 scc_disable_rx_interrupts(ptr);
861 }
862
863
864 static void scc_close(void *ptr)
865 {
866 scc_disable_tx_interrupts(ptr);
867 scc_disable_rx_interrupts(ptr);
868 }
869
870
871 /*---------------------------------------------------------------------------
872 * Internal support functions
873 *--------------------------------------------------------------------------*/
874
875 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
876 {
877 unsigned long flags;
878 unsigned char t;
879 SCC_ACCESS_INIT(port);
880
881 local_irq_save(flags);
882 t = SCCread(TX_CTRL_REG);
883 if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
884 if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
885 SCCwrite(TX_CTRL_REG, t);
886 local_irq_restore(flags);
887 }
888
889
890 static void scc_send_xchar(struct tty_struct *tty, char ch)
891 {
892 struct scc_port *port = tty->driver_data;
893
894 port->x_char = ch;
895 if (ch)
896 scc_enable_tx_interrupts(port);
897 }
898
899
900 /*---------------------------------------------------------------------------
901 * Driver entrypoints referenced from above
902 *--------------------------------------------------------------------------*/
903
904 static int scc_open (struct tty_struct * tty, struct file * filp)
905 {
906 int line = tty->index;
907 int retval;
908 struct scc_port *port = &scc_ports[line];
909 int i, channel = port->channel;
910 unsigned long flags;
911 SCC_ACCESS_INIT(port);
912 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
913 static const struct {
914 unsigned reg, val;
915 } mvme_init_tab[] = {
916 /* Values for MVME162 and MVME147 */
917 /* no parity, 1 stop bit, async, 1:16 */
918 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
919 /* parity error is special cond, ints disabled, no DMA */
920 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
921 /* Rx 8 bits/char, no auto enable, Rx off */
922 { RX_CTRL_REG, RCR_CHSIZE_8 },
923 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
924 { TX_CTRL_REG, TCR_CHSIZE_8 },
925 /* special features off */
926 { AUX2_CTRL_REG, 0 },
927 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
928 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
929 /* Start Rx */
930 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
931 /* Start Tx */
932 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
933 /* Ext/Stat ints: DCD only */
934 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
935 /* Reset Ext/Stat ints */
936 { COMMAND_REG, CR_EXTSTAT_RESET },
937 /* ...again */
938 { COMMAND_REG, CR_EXTSTAT_RESET },
939 };
940 #endif
941 #if defined(CONFIG_BVME6000_SCC)
942 static const struct {
943 unsigned reg, val;
944 } bvme_init_tab[] = {
945 /* Values for BVME6000 */
946 /* no parity, 1 stop bit, async, 1:16 */
947 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
948 /* parity error is special cond, ints disabled, no DMA */
949 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
950 /* Rx 8 bits/char, no auto enable, Rx off */
951 { RX_CTRL_REG, RCR_CHSIZE_8 },
952 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
953 { TX_CTRL_REG, TCR_CHSIZE_8 },
954 /* special features off */
955 { AUX2_CTRL_REG, 0 },
956 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
957 { DPLL_CTRL_REG, DCR_BRG_ENAB },
958 /* Start Rx */
959 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
960 /* Start Tx */
961 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
962 /* Ext/Stat ints: DCD only */
963 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
964 /* Reset Ext/Stat ints */
965 { COMMAND_REG, CR_EXTSTAT_RESET },
966 /* ...again */
967 { COMMAND_REG, CR_EXTSTAT_RESET },
968 };
969 #endif
970 if (!(port->gs.port.flags & ASYNC_INITIALIZED)) {
971 local_irq_save(flags);
972 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
973 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
974 for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
975 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
976 }
977 #endif
978 #if defined(CONFIG_BVME6000_SCC)
979 if (MACH_IS_BVME6000) {
980 for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
981 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
982 }
983 #endif
984
985 /* remember status register for detection of DCD and CTS changes */
986 scc_last_status_reg[channel] = SCCread(STATUS_REG);
987
988 port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
989 scc_setsignals (port, 1,1);
990 local_irq_restore(flags);
991 }
992
993 tty->driver_data = port;
994 port->gs.port.tty = tty;
995 port->gs.port.count++;
996 retval = gs_init_port(&port->gs);
997 if (retval) {
998 port->gs.port.count--;
999 return retval;
1000 }
1001 port->gs.port.flags |= GS_ACTIVE;
1002 retval = gs_block_til_ready(port, filp);
1003
1004 if (retval) {
1005 port->gs.port.count--;
1006 return retval;
1007 }
1008
1009 port->c_dcd = tty_port_carrier_raised(&port->gs.port);
1010
1011 scc_enable_rx_interrupts(port);
1012
1013 return 0;
1014 }
1015
1016
1017 static void scc_throttle (struct tty_struct * tty)
1018 {
1019 struct scc_port *port = tty->driver_data;
1020 unsigned long flags;
1021 SCC_ACCESS_INIT(port);
1022
1023 if (tty->termios->c_cflag & CRTSCTS) {
1024 local_irq_save(flags);
1025 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
1026 local_irq_restore(flags);
1027 }
1028 if (I_IXOFF(tty))
1029 scc_send_xchar(tty, STOP_CHAR(tty));
1030 }
1031
1032
1033 static void scc_unthrottle (struct tty_struct * tty)
1034 {
1035 struct scc_port *port = tty->driver_data;
1036 unsigned long flags;
1037 SCC_ACCESS_INIT(port);
1038
1039 if (tty->termios->c_cflag & CRTSCTS) {
1040 local_irq_save(flags);
1041 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
1042 local_irq_restore(flags);
1043 }
1044 if (I_IXOFF(tty))
1045 scc_send_xchar(tty, START_CHAR(tty));
1046 }
1047
1048
1049 static int scc_ioctl(struct tty_struct *tty, struct file *file,
1050 unsigned int cmd, unsigned long arg)
1051 {
1052 return -ENOIOCTLCMD;
1053 }
1054
1055
1056 static int scc_break_ctl(struct tty_struct *tty, int break_state)
1057 {
1058 struct scc_port *port = tty->driver_data;
1059 unsigned long flags;
1060 SCC_ACCESS_INIT(port);
1061
1062 local_irq_save(flags);
1063 SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
1064 break_state ? TCR_SEND_BREAK : 0);
1065 local_irq_restore(flags);
1066 return 0;
1067 }
1068
1069
1070 /*---------------------------------------------------------------------------
1071 * Serial console stuff...
1072 *--------------------------------------------------------------------------*/
1073
1074 #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
1075
1076 static void scc_ch_write (char ch)
1077 {
1078 volatile char *p = NULL;
1079
1080 #ifdef CONFIG_MVME147_SCC
1081 if (MACH_IS_MVME147)
1082 p = (volatile char *)M147_SCC_A_ADDR;
1083 #endif
1084 #ifdef CONFIG_MVME162_SCC
1085 if (MACH_IS_MVME16x)
1086 p = (volatile char *)MVME_SCC_A_ADDR;
1087 #endif
1088 #ifdef CONFIG_BVME6000_SCC
1089 if (MACH_IS_BVME6000)
1090 p = (volatile char *)BVME_SCC_A_ADDR;
1091 #endif
1092
1093 do {
1094 scc_delay();
1095 }
1096 while (!(*p & 4));
1097 scc_delay();
1098 *p = 8;
1099 scc_delay();
1100 *p = ch;
1101 }
1102
1103 /* The console must be locked when we get here. */
1104
1105 static void scc_console_write (struct console *co, const char *str, unsigned count)
1106 {
1107 unsigned long flags;
1108
1109 local_irq_save(flags);
1110
1111 while (count--)
1112 {
1113 if (*str == '\n')
1114 scc_ch_write ('\r');
1115 scc_ch_write (*str++);
1116 }
1117 local_irq_restore(flags);
1118 }
1119
1120 static struct tty_driver *scc_console_device(struct console *c, int *index)
1121 {
1122 *index = c->index;
1123 return scc_driver;
1124 }
1125
1126 static struct console sercons = {
1127 .name = "ttyS",
1128 .write = scc_console_write,
1129 .device = scc_console_device,
1130 .flags = CON_PRINTBUFFER,
1131 .index = -1,
1132 };
1133
1134
1135 static int __init vme_scc_console_init(void)
1136 {
1137 if (vme_brdtype == VME_TYPE_MVME147 ||
1138 vme_brdtype == VME_TYPE_MVME162 ||
1139 vme_brdtype == VME_TYPE_MVME172 ||
1140 vme_brdtype == VME_TYPE_BVME4000 ||
1141 vme_brdtype == VME_TYPE_BVME6000)
1142 register_console(&sercons);
1143 return 0;
1144 }
1145 console_initcall(vme_scc_console_init);
Linux with added FPC-III support