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Merge tag 'cleanup-initcall' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6/libata-dev.git] / arch / arm / mach-omap2 / mux.c
blob80e55c5c99988c2bf63d49a63bf9b562cfaff036
1 /*
2 * linux/arch/arm/mach-omap2/mux.c
3 *
4 * OMAP2, OMAP3 and OMAP4 pin multiplexing configurations
5 *
6 * Copyright (C) 2004 - 2010 Texas Instruments Inc.
7 * Copyright (C) 2003 - 2008 Nokia Corporation
8 *
9 * Written by Tony Lindgren
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 */
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/io.h>
29 #include <linux/list.h>
30 #include <linux/slab.h>
31 #include <linux/ctype.h>
32 #include <linux/debugfs.h>
33 #include <linux/seq_file.h>
34 #include <linux/uaccess.h>
35 #include <linux/irq.h>
36 #include <linux/interrupt.h>
37
38
39 #include <plat/omap_hwmod.h>
40
41 #include "control.h"
42 #include "mux.h"
43 #include "prm.h"
44
45 #define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
46 #define OMAP_MUX_BASE_SZ 0x5ca
47
48 struct omap_mux_entry {
49 struct omap_mux mux;
50 struct list_head node;
51 };
52
53 static LIST_HEAD(mux_partitions);
54 static DEFINE_MUTEX(muxmode_mutex);
55
56 struct omap_mux_partition *omap_mux_get(const char *name)
57 {
58 struct omap_mux_partition *partition;
59
60 list_for_each_entry(partition, &mux_partitions, node) {
61 if (!strcmp(name, partition->name))
62 return partition;
63 }
64
65 return NULL;
66 }
67
68 u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
69 {
70 if (partition->flags & OMAP_MUX_REG_8BIT)
71 return __raw_readb(partition->base + reg);
72 else
73 return __raw_readw(partition->base + reg);
74 }
75
76 void omap_mux_write(struct omap_mux_partition *partition, u16 val,
77 u16 reg)
78 {
79 if (partition->flags & OMAP_MUX_REG_8BIT)
80 __raw_writeb(val, partition->base + reg);
81 else
82 __raw_writew(val, partition->base + reg);
83 }
84
85 void omap_mux_write_array(struct omap_mux_partition *partition,
86 struct omap_board_mux *board_mux)
87 {
88 if (!board_mux)
89 return;
90
91 while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
92 omap_mux_write(partition, board_mux->value,
93 board_mux->reg_offset);
94 board_mux++;
95 }
96 }
97
98 #ifdef CONFIG_OMAP_MUX
99
100 static char *omap_mux_options;
101
102 static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
103 int gpio, int val)
104 {
105 struct omap_mux_entry *e;
106 struct omap_mux *gpio_mux = NULL;
107 u16 old_mode;
108 u16 mux_mode;
109 int found = 0;
110 struct list_head *muxmodes = &partition->muxmodes;
111
112 if (!gpio)
113 return -EINVAL;
114
115 list_for_each_entry(e, muxmodes, node) {
116 struct omap_mux *m = &e->mux;
117 if (gpio == m->gpio) {
118 gpio_mux = m;
119 found++;
120 }
121 }
122
123 if (found == 0) {
124 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
125 return -ENODEV;
126 }
127
128 if (found > 1) {
129 pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
130 found, gpio);
131 return -EINVAL;
132 }
133
134 old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
135 mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
136 if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
137 mux_mode |= OMAP_MUX_MODE3;
138 else
139 mux_mode |= OMAP_MUX_MODE4;
140 pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
141 gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
142 omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
143
144 return 0;
145 }
146
147 int __init omap_mux_init_gpio(int gpio, int val)
148 {
149 struct omap_mux_partition *partition;
150 int ret;
151
152 list_for_each_entry(partition, &mux_partitions, node) {
153 ret = _omap_mux_init_gpio(partition, gpio, val);
154 if (!ret)
155 return ret;
156 }
157
158 return -ENODEV;
159 }
160
161 static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
162 const char *muxname,
163 struct omap_mux **found_mux)
164 {
165 struct omap_mux *mux = NULL;
166 struct omap_mux_entry *e;
167 const char *mode_name;
168 int found = 0, found_mode = 0, mode0_len = 0;
169 struct list_head *muxmodes = &partition->muxmodes;
170
171 mode_name = strchr(muxname, '.');
172 if (mode_name) {
173 mode0_len = strlen(muxname) - strlen(mode_name);
174 mode_name++;
175 } else {
176 mode_name = muxname;
177 }
178
179 list_for_each_entry(e, muxmodes, node) {
180 char *m0_entry;
181 int i;
182
183 mux = &e->mux;
184 m0_entry = mux->muxnames[0];
185
186 /* First check for full name in mode0.muxmode format */
187 if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
188 continue;
189
190 /* Then check for muxmode only */
191 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
192 char *mode_cur = mux->muxnames[i];
193
194 if (!mode_cur)
195 continue;
196
197 if (!strcmp(mode_name, mode_cur)) {
198 *found_mux = mux;
199 found++;
200 found_mode = i;
201 }
202 }
203 }
204
205 if (found == 1) {
206 return found_mode;
207 }
208
209 if (found > 1) {
210 pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
211 found, muxname);
212 return -EINVAL;
213 }
214
215 pr_err("%s: Could not find signal %s\n", __func__, muxname);
216
217 return -ENODEV;
218 }
219
220 static int __init
221 omap_mux_get_by_name(const char *muxname,
222 struct omap_mux_partition **found_partition,
223 struct omap_mux **found_mux)
224 {
225 struct omap_mux_partition *partition;
226
227 list_for_each_entry(partition, &mux_partitions, node) {
228 struct omap_mux *mux = NULL;
229 int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
230 if (mux_mode < 0)
231 continue;
232
233 *found_partition = partition;
234 *found_mux = mux;
235
236 return mux_mode;
237 }
238
239 return -ENODEV;
240 }
241
242 int __init omap_mux_init_signal(const char *muxname, int val)
243 {
244 struct omap_mux_partition *partition = NULL;
245 struct omap_mux *mux = NULL;
246 u16 old_mode;
247 int mux_mode;
248
249 mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
250 if (mux_mode < 0 || !mux)
251 return mux_mode;
252
253 old_mode = omap_mux_read(partition, mux->reg_offset);
254 mux_mode |= val;
255 pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
256 __func__, muxname, old_mode, mux_mode);
257 omap_mux_write(partition, mux_mode, mux->reg_offset);
258
259 return 0;
260 }
261
262 struct omap_hwmod_mux_info * __init
263 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
264 {
265 struct omap_hwmod_mux_info *hmux;
266 int i, nr_pads_dynamic = 0;
267
268 if (!bpads || nr_pads < 1)
269 return NULL;
270
271 hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
272 if (!hmux)
273 goto err1;
274
275 hmux->nr_pads = nr_pads;
276
277 hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
278 nr_pads, GFP_KERNEL);
279 if (!hmux->pads)
280 goto err2;
281
282 for (i = 0; i < hmux->nr_pads; i++) {
283 struct omap_mux_partition *partition;
284 struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
285 struct omap_mux *mux;
286 int mux_mode;
287
288 mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
289 if (mux_mode < 0)
290 goto err3;
291 if (!pad->partition)
292 pad->partition = partition;
293 if (!pad->mux)
294 pad->mux = mux;
295
296 pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
297 if (!pad->name) {
298 int j;
299
300 for (j = i - 1; j >= 0; j--)
301 kfree(hmux->pads[j].name);
302 goto err3;
303 }
304 strcpy(pad->name, bpad->name);
305
306 pad->flags = bpad->flags;
307 pad->enable = bpad->enable;
308 pad->idle = bpad->idle;
309 pad->off = bpad->off;
310
311 if (pad->flags &
312 (OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP))
313 nr_pads_dynamic++;
314
315 pr_debug("%s: Initialized %s\n", __func__, pad->name);
316 }
317
318 if (!nr_pads_dynamic)
319 return hmux;
320
321 /*
322 * Add pads that need dynamic muxing into a separate list
323 */
324
325 hmux->nr_pads_dynamic = nr_pads_dynamic;
326 hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
327 nr_pads_dynamic, GFP_KERNEL);
328 if (!hmux->pads_dynamic) {
329 pr_err("%s: Could not allocate dynamic pads\n", __func__);
330 return hmux;
331 }
332
333 nr_pads_dynamic = 0;
334 for (i = 0; i < hmux->nr_pads; i++) {
335 struct omap_device_pad *pad = &hmux->pads[i];
336
337 if (pad->flags &
338 (OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP)) {
339 pr_debug("%s: pad %s tagged dynamic\n",
340 __func__, pad->name);
341 hmux->pads_dynamic[nr_pads_dynamic] = pad;
342 nr_pads_dynamic++;
343 }
344 }
345
346 return hmux;
347
348 err3:
349 kfree(hmux->pads);
350 err2:
351 kfree(hmux);
352 err1:
353 pr_err("%s: Could not allocate device mux entry\n", __func__);
354
355 return NULL;
356 }
357
358 /**
359 * omap_hwmod_mux_scan_wakeups - omap hwmod scan wakeup pads
360 * @hmux: Pads for a hwmod
361 * @mpu_irqs: MPU irq array for a hwmod
362 *
363 * Scans the wakeup status of pads for a single hwmod. If an irq
364 * array is defined for this mux, the parser will call the registered
365 * ISRs for corresponding pads, otherwise the parser will stop at the
366 * first wakeup active pad and return. Returns true if there is a
367 * pending and non-served wakeup event for the mux, otherwise false.
368 */
369 static bool omap_hwmod_mux_scan_wakeups(struct omap_hwmod_mux_info *hmux,
370 struct omap_hwmod_irq_info *mpu_irqs)
371 {
372 int i, irq;
373 unsigned int val;
374 u32 handled_irqs = 0;
375
376 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
377 struct omap_device_pad *pad = hmux->pads_dynamic[i];
378
379 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP) ||
380 !(pad->idle & OMAP_WAKEUP_EN))
381 continue;
382
383 val = omap_mux_read(pad->partition, pad->mux->reg_offset);
384 if (!(val & OMAP_WAKEUP_EVENT))
385 continue;
386
387 if (!hmux->irqs)
388 return true;
389
390 irq = hmux->irqs[i];
391 /* make sure we only handle each irq once */
392 if (handled_irqs & 1 << irq)
393 continue;
394
395 handled_irqs |= 1 << irq;
396
397 generic_handle_irq(mpu_irqs[irq].irq);
398 }
399
400 return false;
401 }
402
403 /**
404 * _omap_hwmod_mux_handle_irq - Process wakeup events for a single hwmod
405 *
406 * Checks a single hwmod for every wakeup capable pad to see if there is an
407 * active wakeup event. If this is the case, call the corresponding ISR.
408 */
409 static int _omap_hwmod_mux_handle_irq(struct omap_hwmod *oh, void *data)
410 {
411 if (!oh->mux || !oh->mux->enabled)
412 return 0;
413 if (omap_hwmod_mux_scan_wakeups(oh->mux, oh->mpu_irqs))
414 generic_handle_irq(oh->mpu_irqs[0].irq);
415 return 0;
416 }
417
418 /**
419 * omap_hwmod_mux_handle_irq - Process pad wakeup irqs.
420 *
421 * Calls a function for each registered omap_hwmod to check
422 * pad wakeup statuses.
423 */
424 static irqreturn_t omap_hwmod_mux_handle_irq(int irq, void *unused)
425 {
426 omap_hwmod_for_each(_omap_hwmod_mux_handle_irq, NULL);
427 return IRQ_HANDLED;
428 }
429
430 /* Assumes the calling function takes care of locking */
431 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
432 {
433 int i;
434
435 /* Runtime idling of dynamic pads */
436 if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
437 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
438 struct omap_device_pad *pad = hmux->pads_dynamic[i];
439 int val = -EINVAL;
440
441 val = pad->idle;
442 omap_mux_write(pad->partition, val,
443 pad->mux->reg_offset);
444 }
445
446 return;
447 }
448
449 /* Runtime enabling of dynamic pads */
450 if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic
451 && hmux->enabled) {
452 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
453 struct omap_device_pad *pad = hmux->pads_dynamic[i];
454 int val = -EINVAL;
455
456 val = pad->enable;
457 omap_mux_write(pad->partition, val,
458 pad->mux->reg_offset);
459 }
460
461 return;
462 }
463
464 /* Enabling or disabling of all pads */
465 for (i = 0; i < hmux->nr_pads; i++) {
466 struct omap_device_pad *pad = &hmux->pads[i];
467 int flags, val = -EINVAL;
468
469 flags = pad->flags;
470
471 switch (state) {
472 case _HWMOD_STATE_ENABLED:
473 val = pad->enable;
474 pr_debug("%s: Enabling %s %x\n", __func__,
475 pad->name, val);
476 break;
477 case _HWMOD_STATE_DISABLED:
478 /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
479 if (flags & OMAP_DEVICE_PAD_REMUX)
480 val = pad->off;
481 else
482 val = OMAP_MUX_MODE7;
483 pr_debug("%s: Disabling %s %x\n", __func__,
484 pad->name, val);
485 break;
486 default:
487 /* Nothing to be done */
488 break;
489 };
490
491 if (val >= 0) {
492 omap_mux_write(pad->partition, val,
493 pad->mux->reg_offset);
494 pad->flags = flags;
495 }
496 }
497
498 if (state == _HWMOD_STATE_ENABLED)
499 hmux->enabled = true;
500 else
501 hmux->enabled = false;
502 }
503
504 #ifdef CONFIG_DEBUG_FS
505
506 #define OMAP_MUX_MAX_NR_FLAGS 10
507 #define OMAP_MUX_TEST_FLAG(val, mask) \
508 if (((val) & (mask)) == (mask)) { \
509 i++; \
510 flags[i] = #mask; \
511 }
512
513 /* REVISIT: Add checking for non-optimal mux settings */
514 static inline void omap_mux_decode(struct seq_file *s, u16 val)
515 {
516 char *flags[OMAP_MUX_MAX_NR_FLAGS];
517 char mode[sizeof("OMAP_MUX_MODE") + 1];
518 int i = -1;
519
520 sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
521 i++;
522 flags[i] = mode;
523
524 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
525 if (val & OMAP_OFF_EN) {
526 if (!(val & OMAP_OFFOUT_EN)) {
527 if (!(val & OMAP_OFF_PULL_UP)) {
528 OMAP_MUX_TEST_FLAG(val,
529 OMAP_PIN_OFF_INPUT_PULLDOWN);
530 } else {
531 OMAP_MUX_TEST_FLAG(val,
532 OMAP_PIN_OFF_INPUT_PULLUP);
533 }
534 } else {
535 if (!(val & OMAP_OFFOUT_VAL)) {
536 OMAP_MUX_TEST_FLAG(val,
537 OMAP_PIN_OFF_OUTPUT_LOW);
538 } else {
539 OMAP_MUX_TEST_FLAG(val,
540 OMAP_PIN_OFF_OUTPUT_HIGH);
541 }
542 }
543 }
544
545 if (val & OMAP_INPUT_EN) {
546 if (val & OMAP_PULL_ENA) {
547 if (!(val & OMAP_PULL_UP)) {
548 OMAP_MUX_TEST_FLAG(val,
549 OMAP_PIN_INPUT_PULLDOWN);
550 } else {
551 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
552 }
553 } else {
554 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
555 }
556 } else {
557 i++;
558 flags[i] = "OMAP_PIN_OUTPUT";
559 }
560
561 do {
562 seq_printf(s, "%s", flags[i]);
563 if (i > 0)
564 seq_printf(s, " | ");
565 } while (i-- > 0);
566 }
567
568 #define OMAP_MUX_DEFNAME_LEN 32
569
570 static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
571 {
572 struct omap_mux_partition *partition = s->private;
573 struct omap_mux_entry *e;
574 u8 omap_gen = omap_rev() >> 28;
575
576 list_for_each_entry(e, &partition->muxmodes, node) {
577 struct omap_mux *m = &e->mux;
578 char m0_def[OMAP_MUX_DEFNAME_LEN];
579 char *m0_name = m->muxnames[0];
580 u16 val;
581 int i, mode;
582
583 if (!m0_name)
584 continue;
585
586 /* REVISIT: Needs to be updated if mode0 names get longer */
587 for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
588 if (m0_name[i] == '\0') {
589 m0_def[i] = m0_name[i];
590 break;
591 }
592 m0_def[i] = toupper(m0_name[i]);
593 }
594 val = omap_mux_read(partition, m->reg_offset);
595 mode = val & OMAP_MUX_MODE7;
596 if (mode != 0)
597 seq_printf(s, "/* %s */\n", m->muxnames[mode]);
598
599 /*
600 * XXX: Might be revisited to support differences across
601 * same OMAP generation.
602 */
603 seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
604 omap_mux_decode(s, val);
605 seq_printf(s, "),\n");
606 }
607
608 return 0;
609 }
610
611 static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
612 {
613 return single_open(file, omap_mux_dbg_board_show, inode->i_private);
614 }
615
616 static const struct file_operations omap_mux_dbg_board_fops = {
617 .open = omap_mux_dbg_board_open,
618 .read = seq_read,
619 .llseek = seq_lseek,
620 .release = single_release,
621 };
622
623 static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
624 {
625 struct omap_mux_partition *partition;
626
627 list_for_each_entry(partition, &mux_partitions, node) {
628 struct list_head *muxmodes = &partition->muxmodes;
629 struct omap_mux_entry *e;
630
631 list_for_each_entry(e, muxmodes, node) {
632 struct omap_mux *m = &e->mux;
633
634 if (m == mux)
635 return partition;
636 }
637 }
638
639 return NULL;
640 }
641
642 static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
643 {
644 struct omap_mux *m = s->private;
645 struct omap_mux_partition *partition;
646 const char *none = "NA";
647 u16 val;
648 int mode;
649
650 partition = omap_mux_get_partition(m);
651 if (!partition)
652 return 0;
653
654 val = omap_mux_read(partition, m->reg_offset);
655 mode = val & OMAP_MUX_MODE7;
656
657 seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
658 m->muxnames[0], m->muxnames[mode],
659 partition->phys + m->reg_offset, m->reg_offset, val,
660 m->balls[0] ? m->balls[0] : none,
661 m->balls[1] ? m->balls[1] : none);
662 seq_printf(s, "mode: ");
663 omap_mux_decode(s, val);
664 seq_printf(s, "\n");
665 seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
666 m->muxnames[0] ? m->muxnames[0] : none,
667 m->muxnames[1] ? m->muxnames[1] : none,
668 m->muxnames[2] ? m->muxnames[2] : none,
669 m->muxnames[3] ? m->muxnames[3] : none,
670 m->muxnames[4] ? m->muxnames[4] : none,
671 m->muxnames[5] ? m->muxnames[5] : none,
672 m->muxnames[6] ? m->muxnames[6] : none,
673 m->muxnames[7] ? m->muxnames[7] : none);
674
675 return 0;
676 }
677
678 #define OMAP_MUX_MAX_ARG_CHAR 7
679
680 static ssize_t omap_mux_dbg_signal_write(struct file *file,
681 const char __user *user_buf,
682 size_t count, loff_t *ppos)
683 {
684 char buf[OMAP_MUX_MAX_ARG_CHAR];
685 struct seq_file *seqf;
686 struct omap_mux *m;
687 unsigned long val;
688 int buf_size, ret;
689 struct omap_mux_partition *partition;
690
691 if (count > OMAP_MUX_MAX_ARG_CHAR)
692 return -EINVAL;
693
694 memset(buf, 0, sizeof(buf));
695 buf_size = min(count, sizeof(buf) - 1);
696
697 if (copy_from_user(buf, user_buf, buf_size))
698 return -EFAULT;
699
700 ret = strict_strtoul(buf, 0x10, &val);
701 if (ret < 0)
702 return ret;
703
704 if (val > 0xffff)
705 return -EINVAL;
706
707 seqf = file->private_data;
708 m = seqf->private;
709
710 partition = omap_mux_get_partition(m);
711 if (!partition)
712 return -ENODEV;
713
714 omap_mux_write(partition, (u16)val, m->reg_offset);
715 *ppos += count;
716
717 return count;
718 }
719
720 static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
721 {
722 return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
723 }
724
725 static const struct file_operations omap_mux_dbg_signal_fops = {
726 .open = omap_mux_dbg_signal_open,
727 .read = seq_read,
728 .write = omap_mux_dbg_signal_write,
729 .llseek = seq_lseek,
730 .release = single_release,
731 };
732
733 static struct dentry *mux_dbg_dir;
734
735 static void __init omap_mux_dbg_create_entry(
736 struct omap_mux_partition *partition,
737 struct dentry *mux_dbg_dir)
738 {
739 struct omap_mux_entry *e;
740
741 list_for_each_entry(e, &partition->muxmodes, node) {
742 struct omap_mux *m = &e->mux;
743
744 (void)debugfs_create_file(m->muxnames[0], S_IWUSR, mux_dbg_dir,
745 m, &omap_mux_dbg_signal_fops);
746 }
747 }
748
749 static void __init omap_mux_dbg_init(void)
750 {
751 struct omap_mux_partition *partition;
752 static struct dentry *mux_dbg_board_dir;
753
754 mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
755 if (!mux_dbg_dir)
756 return;
757
758 mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
759 if (!mux_dbg_board_dir)
760 return;
761
762 list_for_each_entry(partition, &mux_partitions, node) {
763 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
764 (void)debugfs_create_file(partition->name, S_IRUGO,
765 mux_dbg_board_dir, partition,
766 &omap_mux_dbg_board_fops);
767 }
768 }
769
770 #else
771 static inline void omap_mux_dbg_init(void)
772 {
773 }
774 #endif /* CONFIG_DEBUG_FS */
775
776 static void __init omap_mux_free_names(struct omap_mux *m)
777 {
778 int i;
779
780 for (i = 0; i < OMAP_MUX_NR_MODES; i++)
781 kfree(m->muxnames[i]);
782
783 #ifdef CONFIG_DEBUG_FS
784 for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
785 kfree(m->balls[i]);
786 #endif
787
788 }
789
790 /* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
791 int __init omap_mux_late_init(void)
792 {
793 struct omap_mux_partition *partition;
794 int ret;
795
796 list_for_each_entry(partition, &mux_partitions, node) {
797 struct omap_mux_entry *e, *tmp;
798 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
799 struct omap_mux *m = &e->mux;
800 u16 mode = omap_mux_read(partition, m->reg_offset);
801
802 if (OMAP_MODE_GPIO(mode))
803 continue;
804
805 #ifndef CONFIG_DEBUG_FS
806 mutex_lock(&muxmode_mutex);
807 list_del(&e->node);
808 mutex_unlock(&muxmode_mutex);
809 omap_mux_free_names(m);
810 kfree(m);
811 #endif
812 }
813 }
814
815 ret = request_irq(omap_prcm_event_to_irq("io"),
816 omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,
817 "hwmod_io", omap_mux_late_init);
818
819 if (ret)
820 pr_warning("mux: Failed to setup hwmod io irq %d\n", ret);
821
822 omap_mux_dbg_init();
823
824 return 0;
825 }
826
827 static void __init omap_mux_package_fixup(struct omap_mux *p,
828 struct omap_mux *superset)
829 {
830 while (p->reg_offset != OMAP_MUX_TERMINATOR) {
831 struct omap_mux *s = superset;
832 int found = 0;
833
834 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
835 if (s->reg_offset == p->reg_offset) {
836 *s = *p;
837 found++;
838 break;
839 }
840 s++;
841 }
842 if (!found)
843 pr_err("%s: Unknown entry offset 0x%x\n", __func__,
844 p->reg_offset);
845 p++;
846 }
847 }
848
849 #ifdef CONFIG_DEBUG_FS
850
851 static void __init omap_mux_package_init_balls(struct omap_ball *b,
852 struct omap_mux *superset)
853 {
854 while (b->reg_offset != OMAP_MUX_TERMINATOR) {
855 struct omap_mux *s = superset;
856 int found = 0;
857
858 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
859 if (s->reg_offset == b->reg_offset) {
860 s->balls[0] = b->balls[0];
861 s->balls[1] = b->balls[1];
862 found++;
863 break;
864 }
865 s++;
866 }
867 if (!found)
868 pr_err("%s: Unknown ball offset 0x%x\n", __func__,
869 b->reg_offset);
870 b++;
871 }
872 }
873
874 #else /* CONFIG_DEBUG_FS */
875
876 static inline void omap_mux_package_init_balls(struct omap_ball *b,
877 struct omap_mux *superset)
878 {
879 }
880
881 #endif /* CONFIG_DEBUG_FS */
882
883 static int __init omap_mux_setup(char *options)
884 {
885 if (!options)
886 return 0;
887
888 omap_mux_options = options;
889
890 return 1;
891 }
892 __setup("omap_mux=", omap_mux_setup);
893
894 /*
895 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
896 * cmdline options only override the bootloader values.
897 * During development, please enable CONFIG_DEBUG_FS, and use the
898 * signal specific entries under debugfs.
899 */
900 static void __init omap_mux_set_cmdline_signals(void)
901 {
902 char *options, *next_opt, *token;
903
904 if (!omap_mux_options)
905 return;
906
907 options = kstrdup(omap_mux_options, GFP_KERNEL);
908 if (!options)
909 return;
910
911 next_opt = options;
912
913 while ((token = strsep(&next_opt, ",")) != NULL) {
914 char *keyval, *name;
915 unsigned long val;
916
917 keyval = token;
918 name = strsep(&keyval, "=");
919 if (name) {
920 int res;
921
922 res = strict_strtoul(keyval, 0x10, &val);
923 if (res < 0)
924 continue;
925
926 omap_mux_init_signal(name, (u16)val);
927 }
928 }
929
930 kfree(options);
931 }
932
933 static int __init omap_mux_copy_names(struct omap_mux *src,
934 struct omap_mux *dst)
935 {
936 int i;
937
938 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
939 if (src->muxnames[i]) {
940 dst->muxnames[i] = kstrdup(src->muxnames[i],
941 GFP_KERNEL);
942 if (!dst->muxnames[i])
943 goto free;
944 }
945 }
946
947 #ifdef CONFIG_DEBUG_FS
948 for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
949 if (src->balls[i]) {
950 dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
951 if (!dst->balls[i])
952 goto free;
953 }
954 }
955 #endif
956
957 return 0;
958
959 free:
960 omap_mux_free_names(dst);
961 return -ENOMEM;
962
963 }
964
965 #endif /* CONFIG_OMAP_MUX */
966
967 static struct omap_mux *omap_mux_get_by_gpio(
968 struct omap_mux_partition *partition,
969 int gpio)
970 {
971 struct omap_mux_entry *e;
972 struct omap_mux *ret = NULL;
973
974 list_for_each_entry(e, &partition->muxmodes, node) {
975 struct omap_mux *m = &e->mux;
976 if (m->gpio == gpio) {
977 ret = m;
978 break;
979 }
980 }
981
982 return ret;
983 }
984
985 /* Needed for dynamic muxing of GPIO pins for off-idle */
986 u16 omap_mux_get_gpio(int gpio)
987 {
988 struct omap_mux_partition *partition;
989 struct omap_mux *m = NULL;
990
991 list_for_each_entry(partition, &mux_partitions, node) {
992 m = omap_mux_get_by_gpio(partition, gpio);
993 if (m)
994 return omap_mux_read(partition, m->reg_offset);
995 }
996
997 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
998 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
999
1000 return OMAP_MUX_TERMINATOR;
1001 }
1002
1003 /* Needed for dynamic muxing of GPIO pins for off-idle */
1004 void omap_mux_set_gpio(u16 val, int gpio)
1005 {
1006 struct omap_mux_partition *partition;
1007 struct omap_mux *m = NULL;
1008
1009 list_for_each_entry(partition, &mux_partitions, node) {
1010 m = omap_mux_get_by_gpio(partition, gpio);
1011 if (m) {
1012 omap_mux_write(partition, val, m->reg_offset);
1013 return;
1014 }
1015 }
1016
1017 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
1018 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
1019 }
1020
1021 static struct omap_mux * __init omap_mux_list_add(
1022 struct omap_mux_partition *partition,
1023 struct omap_mux *src)
1024 {
1025 struct omap_mux_entry *entry;
1026 struct omap_mux *m;
1027
1028 entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
1029 if (!entry)
1030 return NULL;
1031
1032 m = &entry->mux;
1033 entry->mux = *src;
1034
1035 #ifdef CONFIG_OMAP_MUX
1036 if (omap_mux_copy_names(src, m)) {
1037 kfree(entry);
1038 return NULL;
1039 }
1040 #endif
1041
1042 mutex_lock(&muxmode_mutex);
1043 list_add_tail(&entry->node, &partition->muxmodes);
1044 mutex_unlock(&muxmode_mutex);
1045
1046 return m;
1047 }
1048
1049 /*
1050 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
1051 * the GPIO to mux offset mapping that is needed for dynamic muxing
1052 * of GPIO pins for off-idle.
1053 */
1054 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
1055 struct omap_mux *superset)
1056 {
1057 while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
1058 struct omap_mux *entry;
1059
1060 #ifdef CONFIG_OMAP_MUX
1061 if (!superset->muxnames || !superset->muxnames[0]) {
1062 superset++;
1063 continue;
1064 }
1065 #else
1066 /* Skip pins that are not muxed as GPIO by bootloader */
1067 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
1068 superset->reg_offset))) {
1069 superset++;
1070 continue;
1071 }
1072 #endif
1073
1074 entry = omap_mux_list_add(partition, superset);
1075 if (!entry) {
1076 pr_err("%s: Could not add entry\n", __func__);
1077 return;
1078 }
1079 superset++;
1080 }
1081 }
1082
1083 #ifdef CONFIG_OMAP_MUX
1084
1085 static void omap_mux_init_package(struct omap_mux *superset,
1086 struct omap_mux *package_subset,
1087 struct omap_ball *package_balls)
1088 {
1089 if (package_subset)
1090 omap_mux_package_fixup(package_subset, superset);
1091 if (package_balls)
1092 omap_mux_package_init_balls(package_balls, superset);
1093 }
1094
1095 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1096 struct omap_board_mux *board_mux)
1097 {
1098 omap_mux_set_cmdline_signals();
1099 omap_mux_write_array(partition, board_mux);
1100 }
1101
1102 #else
1103
1104 static void omap_mux_init_package(struct omap_mux *superset,
1105 struct omap_mux *package_subset,
1106 struct omap_ball *package_balls)
1107 {
1108 }
1109
1110 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1111 struct omap_board_mux *board_mux)
1112 {
1113 }
1114
1115 #endif
1116
1117 static u32 mux_partitions_cnt;
1118
1119 int __init omap_mux_init(const char *name, u32 flags,
1120 u32 mux_pbase, u32 mux_size,
1121 struct omap_mux *superset,
1122 struct omap_mux *package_subset,
1123 struct omap_board_mux *board_mux,
1124 struct omap_ball *package_balls)
1125 {
1126 struct omap_mux_partition *partition;
1127
1128 partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1129 if (!partition)
1130 return -ENOMEM;
1131
1132 partition->name = name;
1133 partition->flags = flags;
1134 partition->size = mux_size;
1135 partition->phys = mux_pbase;
1136 partition->base = ioremap(mux_pbase, mux_size);
1137 if (!partition->base) {
1138 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1139 __func__, partition->phys);
1140 kfree(partition);
1141 return -ENODEV;
1142 }
1143
1144 INIT_LIST_HEAD(&partition->muxmodes);
1145
1146 list_add_tail(&partition->node, &mux_partitions);
1147 mux_partitions_cnt++;
1148 pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1149 mux_partitions_cnt, partition->name, partition->flags);
1150
1151 omap_mux_init_package(superset, package_subset, package_balls);
1152 omap_mux_init_list(partition, superset);
1153 omap_mux_init_signals(partition, board_mux);
1154
1155 return 0;
1156 }
1157
Linux 2.6 libata-dev (mirror)