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