ia64/linux-2.6.18-xen.hg

view arch/cris/arch-v10/kernel/io_interface_mux.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /* IO interface mux allocator for ETRAX100LX.
2 * Copyright 2004, Axis Communications AB
3 * $Id: io_interface_mux.c,v 1.2 2004/12/21 12:08:38 starvik Exp $
4 */
7 /* C.f. ETRAX100LX Designer's Reference 20.9 */
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/errno.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
15 #include <asm/arch/svinto.h>
16 #include <asm/io.h>
17 #include <asm/arch/io_interface_mux.h>
20 #define DBG(s)
22 /* Macro to access ETRAX 100 registers */
23 #define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
24 IO_STATE_(reg##_, field##_, _##val)
26 enum io_if_group {
27 group_a = (1<<0),
28 group_b = (1<<1),
29 group_c = (1<<2),
30 group_d = (1<<3),
31 group_e = (1<<4),
32 group_f = (1<<5)
33 };
35 struct watcher
36 {
37 void (*notify)(const unsigned int gpio_in_available,
38 const unsigned int gpio_out_available,
39 const unsigned char pa_available,
40 const unsigned char pb_available);
41 struct watcher *next;
42 };
45 struct if_group
46 {
47 enum io_if_group group;
48 unsigned char used;
49 enum cris_io_interface owner;
50 };
53 struct interface
54 {
55 enum cris_io_interface ioif;
56 unsigned char groups;
57 unsigned char used;
58 char *owner;
59 unsigned int gpio_g_in;
60 unsigned int gpio_g_out;
61 unsigned char gpio_b;
62 };
64 static struct if_group if_groups[6] = {
65 {
66 .group = group_a,
67 .used = 0,
68 },
69 {
70 .group = group_b,
71 .used = 0,
72 },
73 {
74 .group = group_c,
75 .used = 0,
76 },
77 {
78 .group = group_d,
79 .used = 0,
80 },
81 {
82 .group = group_e,
83 .used = 0,
84 },
85 {
86 .group = group_f,
87 .used = 0,
88 }
89 };
91 /* The order in the array must match the order of enum
92 * cris_io_interface in io_interface_mux.h */
93 static struct interface interfaces[] = {
94 /* Begin Non-multiplexed interfaces */
95 {
96 .ioif = if_eth,
97 .groups = 0,
98 .gpio_g_in = 0,
99 .gpio_g_out = 0,
100 .gpio_b = 0
101 },
102 {
103 .ioif = if_serial_0,
104 .groups = 0,
105 .gpio_g_in = 0,
106 .gpio_g_out = 0,
107 .gpio_b = 0
108 },
109 /* End Non-multiplexed interfaces */
110 {
111 .ioif = if_serial_1,
112 .groups = group_e,
113 .gpio_g_in = 0x00000000,
114 .gpio_g_out = 0x00000000,
115 .gpio_b = 0x00
116 },
117 {
118 .ioif = if_serial_2,
119 .groups = group_b,
120 .gpio_g_in = 0x000000c0,
121 .gpio_g_out = 0x000000c0,
122 .gpio_b = 0x00
123 },
124 {
125 .ioif = if_serial_3,
126 .groups = group_c,
127 .gpio_g_in = 0xc0000000,
128 .gpio_g_out = 0xc0000000,
129 .gpio_b = 0x00
130 },
131 {
132 .ioif = if_sync_serial_1,
133 .groups = group_e | group_f, /* if_sync_serial_1 and if_sync_serial_3
134 can be used simultaneously */
135 .gpio_g_in = 0x00000000,
136 .gpio_g_out = 0x00000000,
137 .gpio_b = 0x10
138 },
139 {
140 .ioif = if_sync_serial_3,
141 .groups = group_c | group_f,
142 .gpio_g_in = 0xc0000000,
143 .gpio_g_out = 0xc0000000,
144 .gpio_b = 0x80
145 },
146 {
147 .ioif = if_shared_ram,
148 .groups = group_a,
149 .gpio_g_in = 0x0000ff3e,
150 .gpio_g_out = 0x0000ff38,
151 .gpio_b = 0x00
152 },
153 {
154 .ioif = if_shared_ram_w,
155 .groups = group_a | group_d,
156 .gpio_g_in = 0x00ffff3e,
157 .gpio_g_out = 0x00ffff38,
158 .gpio_b = 0x00
159 },
160 {
161 .ioif = if_par_0,
162 .groups = group_a,
163 .gpio_g_in = 0x0000ff3e,
164 .gpio_g_out = 0x0000ff3e,
165 .gpio_b = 0x00
166 },
167 {
168 .ioif = if_par_1,
169 .groups = group_d,
170 .gpio_g_in = 0x3eff0000,
171 .gpio_g_out = 0x3eff0000,
172 .gpio_b = 0x00
173 },
174 {
175 .ioif = if_par_w,
176 .groups = group_a | group_d,
177 .gpio_g_in = 0x00ffff3e,
178 .gpio_g_out = 0x00ffff3e,
179 .gpio_b = 0x00
180 },
181 {
182 .ioif = if_scsi8_0,
183 .groups = group_a | group_b | group_f, /* if_scsi8_0 and if_scsi8_1
184 can be used simultaneously */
185 .gpio_g_in = 0x0000ffff,
186 .gpio_g_out = 0x0000ffff,
187 .gpio_b = 0x10
188 },
189 {
190 .ioif = if_scsi8_1,
191 .groups = group_c | group_d | group_f, /* if_scsi8_0 and if_scsi8_1
192 can be used simultaneously */
193 .gpio_g_in = 0xffff0000,
194 .gpio_g_out = 0xffff0000,
195 .gpio_b = 0x80
196 },
197 {
198 .ioif = if_scsi_w,
199 .groups = group_a | group_b | group_d | group_f,
200 .gpio_g_in = 0x01ffffff,
201 .gpio_g_out = 0x07ffffff,
202 .gpio_b = 0x80
203 },
204 {
205 .ioif = if_ata,
206 .groups = group_a | group_b | group_c | group_d,
207 .gpio_g_in = 0xf9ffffff,
208 .gpio_g_out = 0xffffffff,
209 .gpio_b = 0x80
210 },
211 {
212 .ioif = if_csp,
213 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
214 .gpio_g_in = 0x00000000,
215 .gpio_g_out = 0x00000000,
216 .gpio_b = 0xfc
217 },
218 {
219 .ioif = if_i2c,
220 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
221 .gpio_g_in = 0x00000000,
222 .gpio_g_out = 0x00000000,
223 .gpio_b = 0x03
224 },
225 {
226 .ioif = if_usb_1,
227 .groups = group_e | group_f,
228 .gpio_g_in = 0x00000000,
229 .gpio_g_out = 0x00000000,
230 .gpio_b = 0x2c
231 },
232 {
233 .ioif = if_usb_2,
234 .groups = group_d,
235 .gpio_g_in = 0x0e000000,
236 .gpio_g_out = 0x3c000000,
237 .gpio_b = 0x00
238 },
239 /* GPIO pins */
240 {
241 .ioif = if_gpio_grp_a,
242 .groups = group_a,
243 .gpio_g_in = 0x0000ff3f,
244 .gpio_g_out = 0x0000ff3f,
245 .gpio_b = 0x00
246 },
247 {
248 .ioif = if_gpio_grp_b,
249 .groups = group_b,
250 .gpio_g_in = 0x000000c0,
251 .gpio_g_out = 0x000000c0,
252 .gpio_b = 0x00
253 },
254 {
255 .ioif = if_gpio_grp_c,
256 .groups = group_c,
257 .gpio_g_in = 0xc0000000,
258 .gpio_g_out = 0xc0000000,
259 .gpio_b = 0x00
260 },
261 {
262 .ioif = if_gpio_grp_d,
263 .groups = group_d,
264 .gpio_g_in = 0x3fff0000,
265 .gpio_g_out = 0x3fff0000,
266 .gpio_b = 0x00
267 },
268 {
269 .ioif = if_gpio_grp_e,
270 .groups = group_e,
271 .gpio_g_in = 0x00000000,
272 .gpio_g_out = 0x00000000,
273 .gpio_b = 0x00
274 },
275 {
276 .ioif = if_gpio_grp_f,
277 .groups = group_f,
278 .gpio_g_in = 0x00000000,
279 .gpio_g_out = 0x00000000,
280 .gpio_b = 0xff
281 }
282 /* Array end */
283 };
285 static struct watcher *watchers = NULL;
287 static unsigned int gpio_in_pins = 0xffffffff;
288 static unsigned int gpio_out_pins = 0xffffffff;
289 static unsigned char gpio_pb_pins = 0xff;
290 static unsigned char gpio_pa_pins = 0xff;
292 static enum cris_io_interface gpio_pa_owners[8];
293 static enum cris_io_interface gpio_pb_owners[8];
294 static enum cris_io_interface gpio_pg_owners[32];
296 static int cris_io_interface_init(void);
298 static unsigned char clear_group_from_set(const unsigned char groups, struct if_group *group)
299 {
300 return (groups & ~group->group);
301 }
304 static struct if_group *get_group(const unsigned char groups)
305 {
306 int i;
307 for (i = 0; i < sizeof(if_groups)/sizeof(struct if_group); i++) {
308 if (groups & if_groups[i].group) {
309 return &if_groups[i];
310 }
311 }
312 return NULL;
313 }
316 static void notify_watchers(void)
317 {
318 struct watcher *w = watchers;
320 DBG(printk("io_interface_mux: notifying watchers\n"));
322 while (NULL != w) {
323 w->notify((const unsigned int)gpio_in_pins,
324 (const unsigned int)gpio_out_pins,
325 (const unsigned char)gpio_pa_pins,
326 (const unsigned char)gpio_pb_pins);
327 w = w->next;
328 }
329 }
332 int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id)
333 {
334 int set_gen_config = 0;
335 int set_gen_config_ii = 0;
336 unsigned long int gens;
337 unsigned long int gens_ii;
338 struct if_group *grp;
339 unsigned char group_set;
340 unsigned long flags;
342 (void)cris_io_interface_init();
344 DBG(printk("cris_request_io_interface(%d, \"%s\")\n", ioif, device_id));
346 if ((ioif >= if_max_interfaces) || (ioif < 0)) {
347 printk(KERN_CRIT "cris_request_io_interface: Bad interface %u submitted for %s\n",
348 ioif,
349 device_id);
350 return -EINVAL;
351 }
353 local_irq_save(flags);
355 if (interfaces[ioif].used) {
356 local_irq_restore(flags);
357 printk(KERN_CRIT "cris_io_interface: Cannot allocate interface for %s, in use by %s\n",
358 device_id,
359 interfaces[ioif].owner);
360 return -EBUSY;
361 }
363 /* Check that all required groups are free before allocating, */
364 group_set = interfaces[ioif].groups;
365 while (NULL != (grp = get_group(group_set))) {
366 if (grp->used) {
367 if (grp->group == group_f) {
368 if ((if_sync_serial_1 == ioif) ||
369 (if_sync_serial_3 == ioif)) {
370 if ((grp->owner != if_sync_serial_1) &&
371 (grp->owner != if_sync_serial_3)) {
372 local_irq_restore(flags);
373 return -EBUSY;
374 }
375 } else if ((if_scsi8_0 == ioif) ||
376 (if_scsi8_1 == ioif)) {
377 if ((grp->owner != if_scsi8_0) &&
378 (grp->owner != if_scsi8_1)) {
379 local_irq_restore(flags);
380 return -EBUSY;
381 }
382 }
383 } else {
384 local_irq_restore(flags);
385 return -EBUSY;
386 }
387 }
388 group_set = clear_group_from_set(group_set, grp);
389 }
391 /* Are the required GPIO pins available too? */
392 if (((interfaces[ioif].gpio_g_in & gpio_in_pins) != interfaces[ioif].gpio_g_in) ||
393 ((interfaces[ioif].gpio_g_out & gpio_out_pins) != interfaces[ioif].gpio_g_out) ||
394 ((interfaces[ioif].gpio_b & gpio_pb_pins) != interfaces[ioif].gpio_b)) {
395 printk(KERN_CRIT "cris_request_io_interface: Could not get required pins for interface %u\n",
396 ioif);
397 return -EBUSY;
398 }
400 /* All needed I/O pins and pin groups are free, allocate. */
401 group_set = interfaces[ioif].groups;
402 while (NULL != (grp = get_group(group_set))) {
403 grp->used = 1;
404 grp->owner = ioif;
405 group_set = clear_group_from_set(group_set, grp);
406 }
408 gens = genconfig_shadow;
409 gens_ii = gen_config_ii_shadow;
411 set_gen_config = 1;
412 switch (ioif)
413 {
414 /* Begin Non-multiplexed interfaces */
415 case if_eth:
416 /* fall through */
417 case if_serial_0:
418 set_gen_config = 0;
419 break;
420 /* End Non-multiplexed interfaces */
421 case if_serial_1:
422 set_gen_config_ii = 1;
423 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, async);
424 break;
425 case if_serial_2:
426 SETS(gens, R_GEN_CONFIG, ser2, select);
427 break;
428 case if_serial_3:
429 SETS(gens, R_GEN_CONFIG, ser3, select);
430 set_gen_config_ii = 1;
431 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, async);
432 break;
433 case if_sync_serial_1:
434 set_gen_config_ii = 1;
435 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, sync);
436 break;
437 case if_sync_serial_3:
438 SETS(gens, R_GEN_CONFIG, ser3, select);
439 set_gen_config_ii = 1;
440 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, sync);
441 break;
442 case if_shared_ram:
443 SETS(gens, R_GEN_CONFIG, mio, select);
444 break;
445 case if_shared_ram_w:
446 SETS(gens, R_GEN_CONFIG, mio_w, select);
447 break;
448 case if_par_0:
449 SETS(gens, R_GEN_CONFIG, par0, select);
450 break;
451 case if_par_1:
452 SETS(gens, R_GEN_CONFIG, par1, select);
453 break;
454 case if_par_w:
455 SETS(gens, R_GEN_CONFIG, par0, select);
456 SETS(gens, R_GEN_CONFIG, par_w, select);
457 break;
458 case if_scsi8_0:
459 SETS(gens, R_GEN_CONFIG, scsi0, select);
460 break;
461 case if_scsi8_1:
462 SETS(gens, R_GEN_CONFIG, scsi1, select);
463 break;
464 case if_scsi_w:
465 SETS(gens, R_GEN_CONFIG, scsi0, select);
466 SETS(gens, R_GEN_CONFIG, scsi0w, select);
467 break;
468 case if_ata:
469 SETS(gens, R_GEN_CONFIG, ata, select);
470 break;
471 case if_csp:
472 /* fall through */
473 case if_i2c:
474 set_gen_config = 0;
475 break;
476 case if_usb_1:
477 SETS(gens, R_GEN_CONFIG, usb1, select);
478 break;
479 case if_usb_2:
480 SETS(gens, R_GEN_CONFIG, usb2, select);
481 break;
482 case if_gpio_grp_a:
483 /* GPIO groups are only accounted, don't do configuration changes. */
484 /* fall through */
485 case if_gpio_grp_b:
486 /* fall through */
487 case if_gpio_grp_c:
488 /* fall through */
489 case if_gpio_grp_d:
490 /* fall through */
491 case if_gpio_grp_e:
492 /* fall through */
493 case if_gpio_grp_f:
494 set_gen_config = 0;
495 break;
496 default:
497 panic("cris_request_io_interface: Bad interface %u submitted for %s\n",
498 ioif,
499 device_id);
500 }
502 interfaces[ioif].used = 1;
503 interfaces[ioif].owner = (char*)device_id;
505 if (set_gen_config) {
506 volatile int i;
507 genconfig_shadow = gens;
508 *R_GEN_CONFIG = genconfig_shadow;
509 /* Wait 12 cycles before doing any DMA command */
510 for(i = 6; i > 0; i--)
511 nop();
512 }
513 if (set_gen_config_ii) {
514 gen_config_ii_shadow = gens_ii;
515 *R_GEN_CONFIG_II = gen_config_ii_shadow;
516 }
518 DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
519 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
520 DBG(printk("grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
521 interfaces[ioif].gpio_g_in,
522 interfaces[ioif].gpio_g_out,
523 interfaces[ioif].gpio_b));
525 gpio_in_pins &= ~interfaces[ioif].gpio_g_in;
526 gpio_out_pins &= ~interfaces[ioif].gpio_g_out;
527 gpio_pb_pins &= ~interfaces[ioif].gpio_b;
529 DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
530 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
532 local_irq_restore(flags);
534 notify_watchers();
536 return 0;
537 }
540 void cris_free_io_interface(enum cris_io_interface ioif)
541 {
542 struct if_group *grp;
543 unsigned char group_set;
544 unsigned long flags;
546 (void)cris_io_interface_init();
548 if ((ioif >= if_max_interfaces) || (ioif < 0)) {
549 printk(KERN_CRIT "cris_free_io_interface: Bad interface %u\n",
550 ioif);
551 return;
552 }
553 local_irq_save(flags);
554 if (!interfaces[ioif].used) {
555 printk(KERN_CRIT "cris_free_io_interface: Freeing free interface %u\n",
556 ioif);
557 local_irq_restore(flags);
558 return;
559 }
560 group_set = interfaces[ioif].groups;
561 while (NULL != (grp = get_group(group_set))) {
562 if (grp->group == group_f) {
563 switch (ioif)
564 {
565 case if_sync_serial_1:
566 if ((grp->owner == if_sync_serial_1) &&
567 interfaces[if_sync_serial_3].used) {
568 grp->owner = if_sync_serial_3;
569 } else
570 grp->used = 0;
571 break;
572 case if_sync_serial_3:
573 if ((grp->owner == if_sync_serial_3) &&
574 interfaces[if_sync_serial_1].used) {
575 grp->owner = if_sync_serial_1;
576 } else
577 grp->used = 0;
578 break;
579 case if_scsi8_0:
580 if ((grp->owner == if_scsi8_0) &&
581 interfaces[if_scsi8_1].used) {
582 grp->owner = if_scsi8_1;
583 } else
584 grp->used = 0;
585 break;
586 case if_scsi8_1:
587 if ((grp->owner == if_scsi8_1) &&
588 interfaces[if_scsi8_0].used) {
589 grp->owner = if_scsi8_0;
590 } else
591 grp->used = 0;
592 break;
593 default:
594 grp->used = 0;
595 }
596 } else {
597 grp->used = 0;
598 }
599 group_set = clear_group_from_set(group_set, grp);
600 }
601 interfaces[ioif].used = 0;
602 interfaces[ioif].owner = NULL;
604 DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
605 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
606 DBG(printk("freeing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
607 interfaces[ioif].gpio_g_in,
608 interfaces[ioif].gpio_g_out,
609 interfaces[ioif].gpio_b));
611 gpio_in_pins |= interfaces[ioif].gpio_g_in;
612 gpio_out_pins |= interfaces[ioif].gpio_g_out;
613 gpio_pb_pins |= interfaces[ioif].gpio_b;
615 DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
616 gpio_in_pins, gpio_out_pins, gpio_pb_pins));
618 local_irq_restore(flags);
620 notify_watchers();
621 }
623 /* Create a bitmask from bit 0 (inclusive) to bit stop_bit
624 (non-inclusive). stop_bit == 0 returns 0x0 */
625 static inline unsigned int create_mask(const unsigned stop_bit)
626 {
627 /* Avoid overflow */
628 if (stop_bit >= 32) {
629 return 0xffffffff;
630 }
631 return (1<<stop_bit)-1;
632 }
635 /* port can be 'a', 'b' or 'g' */
636 int cris_io_interface_allocate_pins(const enum cris_io_interface ioif,
637 const char port,
638 const unsigned start_bit,
639 const unsigned stop_bit)
640 {
641 unsigned int i;
642 unsigned int mask = 0;
643 unsigned int tmp_mask;
644 unsigned long int flags;
645 enum cris_io_interface *owners;
647 (void)cris_io_interface_init();
649 DBG(printk("cris_io_interface_allocate_pins: if=%d port=%c start=%u stop=%u\n",
650 ioif, port, start_bit, stop_bit));
652 if (!((start_bit <= stop_bit) &&
653 ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
654 ((port == 'g') && (stop_bit < 32))))) {
655 return -EINVAL;
656 }
658 mask = create_mask(stop_bit + 1);
659 tmp_mask = create_mask(start_bit);
660 mask &= ~tmp_mask;
662 DBG(printk("cris_io_interface_allocate_pins: port=%c start=%u stop=%u mask=0x%08x\n",
663 port, start_bit, stop_bit, mask));
665 local_irq_save(flags);
667 switch (port) {
668 case 'a':
669 if ((gpio_pa_pins & mask) != mask) {
670 local_irq_restore(flags);
671 return -EBUSY;
672 }
673 owners = gpio_pa_owners;
674 gpio_pa_pins &= ~mask;
675 break;
676 case 'b':
677 if ((gpio_pb_pins & mask) != mask) {
678 local_irq_restore(flags);
679 return -EBUSY;
680 }
681 owners = gpio_pb_owners;
682 gpio_pb_pins &= ~mask;
683 break;
684 case 'g':
685 if (((gpio_in_pins & mask) != mask) ||
686 ((gpio_out_pins & mask) != mask)) {
687 local_irq_restore(flags);
688 return -EBUSY;
689 }
690 owners = gpio_pg_owners;
691 gpio_in_pins &= ~mask;
692 gpio_out_pins &= ~mask;
693 break;
694 default:
695 local_irq_restore(flags);
696 return -EINVAL;
697 }
699 for (i = start_bit; i <= stop_bit; i++) {
700 owners[i] = ioif;
701 }
702 local_irq_restore(flags);
704 notify_watchers();
705 return 0;
706 }
709 /* port can be 'a', 'b' or 'g' */
710 int cris_io_interface_free_pins(const enum cris_io_interface ioif,
711 const char port,
712 const unsigned start_bit,
713 const unsigned stop_bit)
714 {
715 unsigned int i;
716 unsigned int mask = 0;
717 unsigned int tmp_mask;
718 unsigned long int flags;
719 enum cris_io_interface *owners;
721 (void)cris_io_interface_init();
723 if (!((start_bit <= stop_bit) &&
724 ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
725 ((port == 'g') && (stop_bit < 32))))) {
726 return -EINVAL;
727 }
729 mask = create_mask(stop_bit + 1);
730 tmp_mask = create_mask(start_bit);
731 mask &= ~tmp_mask;
733 DBG(printk("cris_io_interface_free_pins: port=%c start=%u stop=%u mask=0x%08x\n",
734 port, start_bit, stop_bit, mask));
736 local_irq_save(flags);
738 switch (port) {
739 case 'a':
740 if ((~gpio_pa_pins & mask) != mask) {
741 local_irq_restore(flags);
742 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
743 }
744 owners = gpio_pa_owners;
745 break;
746 case 'b':
747 if ((~gpio_pb_pins & mask) != mask) {
748 local_irq_restore(flags);
749 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
750 }
751 owners = gpio_pb_owners;
752 break;
753 case 'g':
754 if (((~gpio_in_pins & mask) != mask) ||
755 ((~gpio_out_pins & mask) != mask)) {
756 local_irq_restore(flags);
757 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
758 }
759 owners = gpio_pg_owners;
760 break;
761 default:
762 owners = NULL; /* Cannot happen. Shut up, gcc! */
763 }
765 for (i = start_bit; i <= stop_bit; i++) {
766 if (owners[i] != ioif) {
767 printk(KERN_CRIT "cris_io_interface_free_pins: Freeing unowned pins");
768 }
769 }
771 /* All was ok, change data. */
772 switch (port) {
773 case 'a':
774 gpio_pa_pins |= mask;
775 break;
776 case 'b':
777 gpio_pb_pins |= mask;
778 break;
779 case 'g':
780 gpio_in_pins |= mask;
781 gpio_out_pins |= mask;
782 break;
783 }
785 for (i = start_bit; i <= stop_bit; i++) {
786 owners[i] = if_unclaimed;
787 }
788 local_irq_restore(flags);
789 notify_watchers();
791 return 0;
792 }
795 int cris_io_interface_register_watcher(void (*notify)(const unsigned int gpio_in_available,
796 const unsigned int gpio_out_available,
797 const unsigned char pa_available,
798 const unsigned char pb_available))
799 {
800 struct watcher *w;
802 (void)cris_io_interface_init();
804 if (NULL == notify) {
805 return -EINVAL;
806 }
807 w = kmalloc(sizeof(*w), GFP_KERNEL);
808 if (!w) {
809 return -ENOMEM;
810 }
811 w->notify = notify;
812 w->next = watchers;
813 watchers = w;
815 w->notify((const unsigned int)gpio_in_pins,
816 (const unsigned int)gpio_out_pins,
817 (const unsigned char)gpio_pa_pins,
818 (const unsigned char)gpio_pb_pins);
820 return 0;
821 }
823 void cris_io_interface_delete_watcher(void (*notify)(const unsigned int gpio_in_available,
824 const unsigned int gpio_out_available,
825 const unsigned char pa_available,
826 const unsigned char pb_available))
827 {
828 struct watcher *w = watchers, *prev = NULL;
830 (void)cris_io_interface_init();
832 while ((NULL != w) && (w->notify != notify)){
833 prev = w;
834 w = w->next;
835 }
836 if (NULL != w) {
837 if (NULL != prev) {
838 prev->next = w->next;
839 } else {
840 watchers = w->next;
841 }
842 kfree(w);
843 return;
844 }
845 printk(KERN_WARNING "cris_io_interface_delete_watcher: Deleting unknown watcher 0x%p\n", notify);
846 }
849 static int cris_io_interface_init(void)
850 {
851 static int first = 1;
852 int i;
854 if (!first) {
855 return 0;
856 }
857 first = 0;
859 for (i = 0; i<8; i++) {
860 gpio_pa_owners[i] = if_unclaimed;
861 gpio_pb_owners[i] = if_unclaimed;
862 gpio_pg_owners[i] = if_unclaimed;
863 }
864 for (; i<32; i++) {
865 gpio_pg_owners[i] = if_unclaimed;
866 }
867 return 0;
868 }
871 module_init(cris_io_interface_init);
874 EXPORT_SYMBOL(cris_request_io_interface);
875 EXPORT_SYMBOL(cris_free_io_interface);
876 EXPORT_SYMBOL(cris_io_interface_allocate_pins);
877 EXPORT_SYMBOL(cris_io_interface_free_pins);
878 EXPORT_SYMBOL(cris_io_interface_register_watcher);
879 EXPORT_SYMBOL(cris_io_interface_delete_watcher);