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regulator, mc13xxx: Remove pointless test for unsigned less than zero
[zen-stable.git] / arch / arm / mach-omap2 / mux.c
blob98148b6c36e9a33fedec64f1e9afc1a9796c4ce4
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
36 #include <asm/system.h>
37
38 #include <plat/omap_hwmod.h>
39
40 #include "control.h"
41 #include "mux.h"
42
43 #define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
44 #define OMAP_MUX_BASE_SZ 0x5ca
45
46 struct omap_mux_entry {
47 struct omap_mux mux;
48 struct list_head node;
49 };
50
51 static LIST_HEAD(mux_partitions);
52 static DEFINE_MUTEX(muxmode_mutex);
53
54 struct omap_mux_partition *omap_mux_get(const char *name)
55 {
56 struct omap_mux_partition *partition;
57
58 list_for_each_entry(partition, &mux_partitions, node) {
59 if (!strcmp(name, partition->name))
60 return partition;
61 }
62
63 return NULL;
64 }
65
66 u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
67 {
68 if (partition->flags & OMAP_MUX_REG_8BIT)
69 return __raw_readb(partition->base + reg);
70 else
71 return __raw_readw(partition->base + reg);
72 }
73
74 void omap_mux_write(struct omap_mux_partition *partition, u16 val,
75 u16 reg)
76 {
77 if (partition->flags & OMAP_MUX_REG_8BIT)
78 __raw_writeb(val, partition->base + reg);
79 else
80 __raw_writew(val, partition->base + reg);
81 }
82
83 void omap_mux_write_array(struct omap_mux_partition *partition,
84 struct omap_board_mux *board_mux)
85 {
86 while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
87 omap_mux_write(partition, board_mux->value,
88 board_mux->reg_offset);
89 board_mux++;
90 }
91 }
92
93 #ifdef CONFIG_OMAP_MUX
94
95 static char *omap_mux_options;
96
97 static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
98 int gpio, int val)
99 {
100 struct omap_mux_entry *e;
101 struct omap_mux *gpio_mux = NULL;
102 u16 old_mode;
103 u16 mux_mode;
104 int found = 0;
105 struct list_head *muxmodes = &partition->muxmodes;
106
107 if (!gpio)
108 return -EINVAL;
109
110 list_for_each_entry(e, muxmodes, node) {
111 struct omap_mux *m = &e->mux;
112 if (gpio == m->gpio) {
113 gpio_mux = m;
114 found++;
115 }
116 }
117
118 if (found == 0) {
119 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
120 return -ENODEV;
121 }
122
123 if (found > 1) {
124 pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
125 found, gpio);
126 return -EINVAL;
127 }
128
129 old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
130 mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
131 if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
132 mux_mode |= OMAP_MUX_MODE3;
133 else
134 mux_mode |= OMAP_MUX_MODE4;
135 pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
136 gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
137 omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
138
139 return 0;
140 }
141
142 int __init omap_mux_init_gpio(int gpio, int val)
143 {
144 struct omap_mux_partition *partition;
145 int ret;
146
147 list_for_each_entry(partition, &mux_partitions, node) {
148 ret = _omap_mux_init_gpio(partition, gpio, val);
149 if (!ret)
150 return ret;
151 }
152
153 return -ENODEV;
154 }
155
156 static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
157 const char *muxname,
158 struct omap_mux **found_mux)
159 {
160 struct omap_mux *mux = NULL;
161 struct omap_mux_entry *e;
162 const char *mode_name;
163 int found = 0, found_mode = 0, mode0_len = 0;
164 struct list_head *muxmodes = &partition->muxmodes;
165
166 mode_name = strchr(muxname, '.');
167 if (mode_name) {
168 mode0_len = strlen(muxname) - strlen(mode_name);
169 mode_name++;
170 } else {
171 mode_name = muxname;
172 }
173
174 list_for_each_entry(e, muxmodes, node) {
175 char *m0_entry;
176 int i;
177
178 mux = &e->mux;
179 m0_entry = mux->muxnames[0];
180
181 /* First check for full name in mode0.muxmode format */
182 if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
183 continue;
184
185 /* Then check for muxmode only */
186 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
187 char *mode_cur = mux->muxnames[i];
188
189 if (!mode_cur)
190 continue;
191
192 if (!strcmp(mode_name, mode_cur)) {
193 *found_mux = mux;
194 found++;
195 found_mode = i;
196 }
197 }
198 }
199
200 if (found == 1) {
201 return found_mode;
202 }
203
204 if (found > 1) {
205 pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
206 found, muxname);
207 return -EINVAL;
208 }
209
210 pr_err("%s: Could not find signal %s\n", __func__, muxname);
211
212 return -ENODEV;
213 }
214
215 static int __init
216 omap_mux_get_by_name(const char *muxname,
217 struct omap_mux_partition **found_partition,
218 struct omap_mux **found_mux)
219 {
220 struct omap_mux_partition *partition;
221
222 list_for_each_entry(partition, &mux_partitions, node) {
223 struct omap_mux *mux = NULL;
224 int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
225 if (mux_mode < 0)
226 continue;
227
228 *found_partition = partition;
229 *found_mux = mux;
230
231 return mux_mode;
232 }
233
234 return -ENODEV;
235 }
236
237 int __init omap_mux_init_signal(const char *muxname, int val)
238 {
239 struct omap_mux_partition *partition = NULL;
240 struct omap_mux *mux = NULL;
241 u16 old_mode;
242 int mux_mode;
243
244 mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
245 if (mux_mode < 0)
246 return mux_mode;
247
248 old_mode = omap_mux_read(partition, mux->reg_offset);
249 mux_mode |= val;
250 pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
251 __func__, muxname, old_mode, mux_mode);
252 omap_mux_write(partition, mux_mode, mux->reg_offset);
253
254 return 0;
255 }
256
257 struct omap_hwmod_mux_info * __init
258 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
259 {
260 struct omap_hwmod_mux_info *hmux;
261 int i;
262
263 if (!bpads || nr_pads < 1)
264 return NULL;
265
266 hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
267 if (!hmux)
268 goto err1;
269
270 hmux->nr_pads = nr_pads;
271
272 hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
273 nr_pads, GFP_KERNEL);
274 if (!hmux->pads)
275 goto err2;
276
277 for (i = 0; i < hmux->nr_pads; i++) {
278 struct omap_mux_partition *partition;
279 struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
280 struct omap_mux *mux;
281 int mux_mode;
282
283 mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
284 if (mux_mode < 0)
285 goto err3;
286 if (!pad->partition)
287 pad->partition = partition;
288 if (!pad->mux)
289 pad->mux = mux;
290
291 pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
292 if (!pad->name) {
293 int j;
294
295 for (j = i - 1; j >= 0; j--)
296 kfree(hmux->pads[j].name);
297 goto err3;
298 }
299 strcpy(pad->name, bpad->name);
300
301 pad->flags = bpad->flags;
302 pad->enable = bpad->enable;
303 pad->idle = bpad->idle;
304 pad->off = bpad->off;
305 pr_debug("%s: Initialized %s\n", __func__, pad->name);
306 }
307
308 return hmux;
309
310 err3:
311 kfree(hmux->pads);
312 err2:
313 kfree(hmux);
314 err1:
315 pr_err("%s: Could not allocate device mux entry\n", __func__);
316
317 return NULL;
318 }
319
320 /* Assumes the calling function takes care of locking */
321 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
322 {
323 int i;
324
325 for (i = 0; i < hmux->nr_pads; i++) {
326 struct omap_device_pad *pad = &hmux->pads[i];
327 int flags, val = -EINVAL;
328
329 flags = pad->flags;
330
331 switch (state) {
332 case _HWMOD_STATE_ENABLED:
333 if (flags & OMAP_DEVICE_PAD_ENABLED)
334 break;
335 flags |= OMAP_DEVICE_PAD_ENABLED;
336 val = pad->enable;
337 pr_debug("%s: Enabling %s %x\n", __func__,
338 pad->name, val);
339 break;
340 case _HWMOD_STATE_IDLE:
341 if (!(flags & OMAP_DEVICE_PAD_REMUX))
342 break;
343 flags &= ~OMAP_DEVICE_PAD_ENABLED;
344 val = pad->idle;
345 pr_debug("%s: Idling %s %x\n", __func__,
346 pad->name, val);
347 break;
348 case _HWMOD_STATE_DISABLED:
349 default:
350 /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
351 if (flags & OMAP_DEVICE_PAD_REMUX)
352 val = pad->off;
353 else
354 val = OMAP_MUX_MODE7;
355 flags &= ~OMAP_DEVICE_PAD_ENABLED;
356 pr_debug("%s: Disabling %s %x\n", __func__,
357 pad->name, val);
358 };
359
360 if (val >= 0) {
361 omap_mux_write(pad->partition, val,
362 pad->mux->reg_offset);
363 pad->flags = flags;
364 }
365 }
366 }
367
368 #ifdef CONFIG_DEBUG_FS
369
370 #define OMAP_MUX_MAX_NR_FLAGS 10
371 #define OMAP_MUX_TEST_FLAG(val, mask) \
372 if (((val) & (mask)) == (mask)) { \
373 i++; \
374 flags[i] = #mask; \
375 }
376
377 /* REVISIT: Add checking for non-optimal mux settings */
378 static inline void omap_mux_decode(struct seq_file *s, u16 val)
379 {
380 char *flags[OMAP_MUX_MAX_NR_FLAGS];
381 char mode[sizeof("OMAP_MUX_MODE") + 1];
382 int i = -1;
383
384 sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
385 i++;
386 flags[i] = mode;
387
388 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
389 if (val & OMAP_OFF_EN) {
390 if (!(val & OMAP_OFFOUT_EN)) {
391 if (!(val & OMAP_OFF_PULL_UP)) {
392 OMAP_MUX_TEST_FLAG(val,
393 OMAP_PIN_OFF_INPUT_PULLDOWN);
394 } else {
395 OMAP_MUX_TEST_FLAG(val,
396 OMAP_PIN_OFF_INPUT_PULLUP);
397 }
398 } else {
399 if (!(val & OMAP_OFFOUT_VAL)) {
400 OMAP_MUX_TEST_FLAG(val,
401 OMAP_PIN_OFF_OUTPUT_LOW);
402 } else {
403 OMAP_MUX_TEST_FLAG(val,
404 OMAP_PIN_OFF_OUTPUT_HIGH);
405 }
406 }
407 }
408
409 if (val & OMAP_INPUT_EN) {
410 if (val & OMAP_PULL_ENA) {
411 if (!(val & OMAP_PULL_UP)) {
412 OMAP_MUX_TEST_FLAG(val,
413 OMAP_PIN_INPUT_PULLDOWN);
414 } else {
415 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
416 }
417 } else {
418 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
419 }
420 } else {
421 i++;
422 flags[i] = "OMAP_PIN_OUTPUT";
423 }
424
425 do {
426 seq_printf(s, "%s", flags[i]);
427 if (i > 0)
428 seq_printf(s, " | ");
429 } while (i-- > 0);
430 }
431
432 #define OMAP_MUX_DEFNAME_LEN 32
433
434 static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
435 {
436 struct omap_mux_partition *partition = s->private;
437 struct omap_mux_entry *e;
438 u8 omap_gen = omap_rev() >> 28;
439
440 list_for_each_entry(e, &partition->muxmodes, node) {
441 struct omap_mux *m = &e->mux;
442 char m0_def[OMAP_MUX_DEFNAME_LEN];
443 char *m0_name = m->muxnames[0];
444 u16 val;
445 int i, mode;
446
447 if (!m0_name)
448 continue;
449
450 /* REVISIT: Needs to be updated if mode0 names get longer */
451 for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
452 if (m0_name[i] == '\0') {
453 m0_def[i] = m0_name[i];
454 break;
455 }
456 m0_def[i] = toupper(m0_name[i]);
457 }
458 val = omap_mux_read(partition, m->reg_offset);
459 mode = val & OMAP_MUX_MODE7;
460 if (mode != 0)
461 seq_printf(s, "/* %s */\n", m->muxnames[mode]);
462
463 /*
464 * XXX: Might be revisited to support differences accross
465 * same OMAP generation.
466 */
467 seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
468 omap_mux_decode(s, val);
469 seq_printf(s, "),\n");
470 }
471
472 return 0;
473 }
474
475 static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
476 {
477 return single_open(file, omap_mux_dbg_board_show, inode->i_private);
478 }
479
480 static const struct file_operations omap_mux_dbg_board_fops = {
481 .open = omap_mux_dbg_board_open,
482 .read = seq_read,
483 .llseek = seq_lseek,
484 .release = single_release,
485 };
486
487 static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
488 {
489 struct omap_mux_partition *partition;
490
491 list_for_each_entry(partition, &mux_partitions, node) {
492 struct list_head *muxmodes = &partition->muxmodes;
493 struct omap_mux_entry *e;
494
495 list_for_each_entry(e, muxmodes, node) {
496 struct omap_mux *m = &e->mux;
497
498 if (m == mux)
499 return partition;
500 }
501 }
502
503 return NULL;
504 }
505
506 static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
507 {
508 struct omap_mux *m = s->private;
509 struct omap_mux_partition *partition;
510 const char *none = "NA";
511 u16 val;
512 int mode;
513
514 partition = omap_mux_get_partition(m);
515 if (!partition)
516 return 0;
517
518 val = omap_mux_read(partition, m->reg_offset);
519 mode = val & OMAP_MUX_MODE7;
520
521 seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
522 m->muxnames[0], m->muxnames[mode],
523 partition->phys + m->reg_offset, m->reg_offset, val,
524 m->balls[0] ? m->balls[0] : none,
525 m->balls[1] ? m->balls[1] : none);
526 seq_printf(s, "mode: ");
527 omap_mux_decode(s, val);
528 seq_printf(s, "\n");
529 seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
530 m->muxnames[0] ? m->muxnames[0] : none,
531 m->muxnames[1] ? m->muxnames[1] : none,
532 m->muxnames[2] ? m->muxnames[2] : none,
533 m->muxnames[3] ? m->muxnames[3] : none,
534 m->muxnames[4] ? m->muxnames[4] : none,
535 m->muxnames[5] ? m->muxnames[5] : none,
536 m->muxnames[6] ? m->muxnames[6] : none,
537 m->muxnames[7] ? m->muxnames[7] : none);
538
539 return 0;
540 }
541
542 #define OMAP_MUX_MAX_ARG_CHAR 7
543
544 static ssize_t omap_mux_dbg_signal_write(struct file *file,
545 const char __user *user_buf,
546 size_t count, loff_t *ppos)
547 {
548 char buf[OMAP_MUX_MAX_ARG_CHAR];
549 struct seq_file *seqf;
550 struct omap_mux *m;
551 unsigned long val;
552 int buf_size, ret;
553 struct omap_mux_partition *partition;
554
555 if (count > OMAP_MUX_MAX_ARG_CHAR)
556 return -EINVAL;
557
558 memset(buf, 0, sizeof(buf));
559 buf_size = min(count, sizeof(buf) - 1);
560
561 if (copy_from_user(buf, user_buf, buf_size))
562 return -EFAULT;
563
564 ret = strict_strtoul(buf, 0x10, &val);
565 if (ret < 0)
566 return ret;
567
568 if (val > 0xffff)
569 return -EINVAL;
570
571 seqf = file->private_data;
572 m = seqf->private;
573
574 partition = omap_mux_get_partition(m);
575 if (!partition)
576 return -ENODEV;
577
578 omap_mux_write(partition, (u16)val, m->reg_offset);
579 *ppos += count;
580
581 return count;
582 }
583
584 static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
585 {
586 return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
587 }
588
589 static const struct file_operations omap_mux_dbg_signal_fops = {
590 .open = omap_mux_dbg_signal_open,
591 .read = seq_read,
592 .write = omap_mux_dbg_signal_write,
593 .llseek = seq_lseek,
594 .release = single_release,
595 };
596
597 static struct dentry *mux_dbg_dir;
598
599 static void __init omap_mux_dbg_create_entry(
600 struct omap_mux_partition *partition,
601 struct dentry *mux_dbg_dir)
602 {
603 struct omap_mux_entry *e;
604
605 list_for_each_entry(e, &partition->muxmodes, node) {
606 struct omap_mux *m = &e->mux;
607
608 (void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
609 m, &omap_mux_dbg_signal_fops);
610 }
611 }
612
613 static void __init omap_mux_dbg_init(void)
614 {
615 struct omap_mux_partition *partition;
616 static struct dentry *mux_dbg_board_dir;
617
618 mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
619 if (!mux_dbg_dir)
620 return;
621
622 mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
623 if (!mux_dbg_board_dir)
624 return;
625
626 list_for_each_entry(partition, &mux_partitions, node) {
627 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
628 (void)debugfs_create_file(partition->name, S_IRUGO,
629 mux_dbg_board_dir, partition,
630 &omap_mux_dbg_board_fops);
631 }
632 }
633
634 #else
635 static inline void omap_mux_dbg_init(void)
636 {
637 }
638 #endif /* CONFIG_DEBUG_FS */
639
640 static void __init omap_mux_free_names(struct omap_mux *m)
641 {
642 int i;
643
644 for (i = 0; i < OMAP_MUX_NR_MODES; i++)
645 kfree(m->muxnames[i]);
646
647 #ifdef CONFIG_DEBUG_FS
648 for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
649 kfree(m->balls[i]);
650 #endif
651
652 }
653
654 /* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
655 static int __init omap_mux_late_init(void)
656 {
657 struct omap_mux_partition *partition;
658
659 list_for_each_entry(partition, &mux_partitions, node) {
660 struct omap_mux_entry *e, *tmp;
661 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
662 struct omap_mux *m = &e->mux;
663 u16 mode = omap_mux_read(partition, m->reg_offset);
664
665 if (OMAP_MODE_GPIO(mode))
666 continue;
667
668 #ifndef CONFIG_DEBUG_FS
669 mutex_lock(&muxmode_mutex);
670 list_del(&e->node);
671 mutex_unlock(&muxmode_mutex);
672 omap_mux_free_names(m);
673 kfree(m);
674 #endif
675 }
676 }
677
678 omap_mux_dbg_init();
679
680 return 0;
681 }
682 late_initcall(omap_mux_late_init);
683
684 static void __init omap_mux_package_fixup(struct omap_mux *p,
685 struct omap_mux *superset)
686 {
687 while (p->reg_offset != OMAP_MUX_TERMINATOR) {
688 struct omap_mux *s = superset;
689 int found = 0;
690
691 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
692 if (s->reg_offset == p->reg_offset) {
693 *s = *p;
694 found++;
695 break;
696 }
697 s++;
698 }
699 if (!found)
700 pr_err("%s: Unknown entry offset 0x%x\n", __func__,
701 p->reg_offset);
702 p++;
703 }
704 }
705
706 #ifdef CONFIG_DEBUG_FS
707
708 static void __init omap_mux_package_init_balls(struct omap_ball *b,
709 struct omap_mux *superset)
710 {
711 while (b->reg_offset != OMAP_MUX_TERMINATOR) {
712 struct omap_mux *s = superset;
713 int found = 0;
714
715 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
716 if (s->reg_offset == b->reg_offset) {
717 s->balls[0] = b->balls[0];
718 s->balls[1] = b->balls[1];
719 found++;
720 break;
721 }
722 s++;
723 }
724 if (!found)
725 pr_err("%s: Unknown ball offset 0x%x\n", __func__,
726 b->reg_offset);
727 b++;
728 }
729 }
730
731 #else /* CONFIG_DEBUG_FS */
732
733 static inline void omap_mux_package_init_balls(struct omap_ball *b,
734 struct omap_mux *superset)
735 {
736 }
737
738 #endif /* CONFIG_DEBUG_FS */
739
740 static int __init omap_mux_setup(char *options)
741 {
742 if (!options)
743 return 0;
744
745 omap_mux_options = options;
746
747 return 1;
748 }
749 __setup("omap_mux=", omap_mux_setup);
750
751 /*
752 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
753 * cmdline options only override the bootloader values.
754 * During development, please enable CONFIG_DEBUG_FS, and use the
755 * signal specific entries under debugfs.
756 */
757 static void __init omap_mux_set_cmdline_signals(void)
758 {
759 char *options, *next_opt, *token;
760
761 if (!omap_mux_options)
762 return;
763
764 options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
765 if (!options)
766 return;
767
768 strcpy(options, omap_mux_options);
769 next_opt = options;
770
771 while ((token = strsep(&next_opt, ",")) != NULL) {
772 char *keyval, *name;
773 unsigned long val;
774
775 keyval = token;
776 name = strsep(&keyval, "=");
777 if (name) {
778 int res;
779
780 res = strict_strtoul(keyval, 0x10, &val);
781 if (res < 0)
782 continue;
783
784 omap_mux_init_signal(name, (u16)val);
785 }
786 }
787
788 kfree(options);
789 }
790
791 static int __init omap_mux_copy_names(struct omap_mux *src,
792 struct omap_mux *dst)
793 {
794 int i;
795
796 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
797 if (src->muxnames[i]) {
798 dst->muxnames[i] =
799 kmalloc(strlen(src->muxnames[i]) + 1,
800 GFP_KERNEL);
801 if (!dst->muxnames[i])
802 goto free;
803 strcpy(dst->muxnames[i], src->muxnames[i]);
804 }
805 }
806
807 #ifdef CONFIG_DEBUG_FS
808 for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
809 if (src->balls[i]) {
810 dst->balls[i] =
811 kmalloc(strlen(src->balls[i]) + 1,
812 GFP_KERNEL);
813 if (!dst->balls[i])
814 goto free;
815 strcpy(dst->balls[i], src->balls[i]);
816 }
817 }
818 #endif
819
820 return 0;
821
822 free:
823 omap_mux_free_names(dst);
824 return -ENOMEM;
825
826 }
827
828 #endif /* CONFIG_OMAP_MUX */
829
830 static struct omap_mux *omap_mux_get_by_gpio(
831 struct omap_mux_partition *partition,
832 int gpio)
833 {
834 struct omap_mux_entry *e;
835 struct omap_mux *ret = NULL;
836
837 list_for_each_entry(e, &partition->muxmodes, node) {
838 struct omap_mux *m = &e->mux;
839 if (m->gpio == gpio) {
840 ret = m;
841 break;
842 }
843 }
844
845 return ret;
846 }
847
848 /* Needed for dynamic muxing of GPIO pins for off-idle */
849 u16 omap_mux_get_gpio(int gpio)
850 {
851 struct omap_mux_partition *partition;
852 struct omap_mux *m;
853
854 list_for_each_entry(partition, &mux_partitions, node) {
855 m = omap_mux_get_by_gpio(partition, gpio);
856 if (m)
857 return omap_mux_read(partition, m->reg_offset);
858 }
859
860 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
861 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
862
863 return OMAP_MUX_TERMINATOR;
864 }
865
866 /* Needed for dynamic muxing of GPIO pins for off-idle */
867 void omap_mux_set_gpio(u16 val, int gpio)
868 {
869 struct omap_mux_partition *partition;
870 struct omap_mux *m = NULL;
871
872 list_for_each_entry(partition, &mux_partitions, node) {
873 m = omap_mux_get_by_gpio(partition, gpio);
874 if (m) {
875 omap_mux_write(partition, val, m->reg_offset);
876 return;
877 }
878 }
879
880 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
881 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
882 }
883
884 static struct omap_mux * __init omap_mux_list_add(
885 struct omap_mux_partition *partition,
886 struct omap_mux *src)
887 {
888 struct omap_mux_entry *entry;
889 struct omap_mux *m;
890
891 entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
892 if (!entry)
893 return NULL;
894
895 m = &entry->mux;
896 entry->mux = *src;
897
898 #ifdef CONFIG_OMAP_MUX
899 if (omap_mux_copy_names(src, m)) {
900 kfree(entry);
901 return NULL;
902 }
903 #endif
904
905 mutex_lock(&muxmode_mutex);
906 list_add_tail(&entry->node, &partition->muxmodes);
907 mutex_unlock(&muxmode_mutex);
908
909 return m;
910 }
911
912 /*
913 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
914 * the GPIO to mux offset mapping that is needed for dynamic muxing
915 * of GPIO pins for off-idle.
916 */
917 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
918 struct omap_mux *superset)
919 {
920 while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
921 struct omap_mux *entry;
922
923 #ifdef CONFIG_OMAP_MUX
924 if (!superset->muxnames || !superset->muxnames[0]) {
925 superset++;
926 continue;
927 }
928 #else
929 /* Skip pins that are not muxed as GPIO by bootloader */
930 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
931 superset->reg_offset))) {
932 superset++;
933 continue;
934 }
935 #endif
936
937 entry = omap_mux_list_add(partition, superset);
938 if (!entry) {
939 pr_err("%s: Could not add entry\n", __func__);
940 return;
941 }
942 superset++;
943 }
944 }
945
946 #ifdef CONFIG_OMAP_MUX
947
948 static void omap_mux_init_package(struct omap_mux *superset,
949 struct omap_mux *package_subset,
950 struct omap_ball *package_balls)
951 {
952 if (package_subset)
953 omap_mux_package_fixup(package_subset, superset);
954 if (package_balls)
955 omap_mux_package_init_balls(package_balls, superset);
956 }
957
958 static void omap_mux_init_signals(struct omap_mux_partition *partition,
959 struct omap_board_mux *board_mux)
960 {
961 omap_mux_set_cmdline_signals();
962 omap_mux_write_array(partition, board_mux);
963 }
964
965 #else
966
967 static void omap_mux_init_package(struct omap_mux *superset,
968 struct omap_mux *package_subset,
969 struct omap_ball *package_balls)
970 {
971 }
972
973 static void omap_mux_init_signals(struct omap_mux_partition *partition,
974 struct omap_board_mux *board_mux)
975 {
976 }
977
978 #endif
979
980 static u32 mux_partitions_cnt;
981
982 int __init omap_mux_init(const char *name, u32 flags,
983 u32 mux_pbase, u32 mux_size,
984 struct omap_mux *superset,
985 struct omap_mux *package_subset,
986 struct omap_board_mux *board_mux,
987 struct omap_ball *package_balls)
988 {
989 struct omap_mux_partition *partition;
990
991 partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
992 if (!partition)
993 return -ENOMEM;
994
995 partition->name = name;
996 partition->flags = flags;
997 partition->size = mux_size;
998 partition->phys = mux_pbase;
999 partition->base = ioremap(mux_pbase, mux_size);
1000 if (!partition->base) {
1001 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1002 __func__, partition->phys);
1003 kfree(partition);
1004 return -ENODEV;
1005 }
1006
1007 INIT_LIST_HEAD(&partition->muxmodes);
1008
1009 list_add_tail(&partition->node, &mux_partitions);
1010 mux_partitions_cnt++;
1011 pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1012 mux_partitions_cnt, partition->name, partition->flags);
1013
1014 omap_mux_init_package(superset, package_subset, package_balls);
1015 omap_mux_init_list(partition, superset);
1016 omap_mux_init_signals(partition, board_mux);
1017
1018 return 0;
1019 }
1020