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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#include <linux/irq.h>
36#include <linux/interrupt.h>
37
38
39#include "omap_hwmod.h"
40
41#include "soc.h"
42#include "control.h"
43#include "mux.h"
44#include "prm.h"
45#include "common.h"
46
47#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
48#define OMAP_MUX_BASE_SZ 0x5ca
49
50struct omap_mux_entry {
51 struct omap_mux mux;
52 struct list_head node;
53};
54
55static LIST_HEAD(mux_partitions);
56static DEFINE_MUTEX(muxmode_mutex);
57
58struct omap_mux_partition *omap_mux_get(const char *name)
59{
60 struct omap_mux_partition *partition;
61
62 list_for_each_entry(partition, &mux_partitions, node) {
63 if (!strcmp(name, partition->name))
64 return partition;
65 }
66
67 return NULL;
68}
69
70u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
71{
72 if (partition->flags & OMAP_MUX_REG_8BIT)
73 return readb_relaxed(partition->base + reg);
74 else
75 return readw_relaxed(partition->base + reg);
76}
77
78void omap_mux_write(struct omap_mux_partition *partition, u16 val,
79 u16 reg)
80{
81 if (partition->flags & OMAP_MUX_REG_8BIT)
82 writeb_relaxed(val, partition->base + reg);
83 else
84 writew_relaxed(val, partition->base + reg);
85}
86
87void omap_mux_write_array(struct omap_mux_partition *partition,
88 struct omap_board_mux *board_mux)
89{
90 if (!board_mux)
91 return;
92
93 while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
94 omap_mux_write(partition, board_mux->value,
95 board_mux->reg_offset);
96 board_mux++;
97 }
98}
99
100#ifdef CONFIG_OMAP_MUX
101
102static char *omap_mux_options;
103
104static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
105 int gpio, int val)
106{
107 struct omap_mux_entry *e;
108 struct omap_mux *gpio_mux = NULL;
109 u16 old_mode;
110 u16 mux_mode;
111 int found = 0;
112 struct list_head *muxmodes = &partition->muxmodes;
113
114 if (!gpio)
115 return -EINVAL;
116
117 list_for_each_entry(e, muxmodes, node) {
118 struct omap_mux *m = &e->mux;
119 if (gpio == m->gpio) {
120 gpio_mux = m;
121 found++;
122 }
123 }
124
125 if (found == 0) {
126 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
127 return -ENODEV;
128 }
129
130 if (found > 1) {
131 pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
132 found, gpio);
133 return -EINVAL;
134 }
135
136 old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
137 mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
138 mux_mode |= partition->gpio;
139 pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
140 gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
141 omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
142
143 return 0;
144}
145
146int __init omap_mux_init_gpio(int gpio, int val)
147{
148 struct omap_mux_partition *partition;
149 int ret;
150
151 list_for_each_entry(partition, &mux_partitions, node) {
152 ret = _omap_mux_init_gpio(partition, gpio, val);
153 if (!ret)
154 return ret;
155 }
156
157 return -ENODEV;
158}
159
160static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
161 const char *muxname,
162 struct omap_mux **found_mux)
163{
164 struct omap_mux *mux = NULL;
165 struct omap_mux_entry *e;
166 const char *mode_name;
167 int found = 0, found_mode = 0, mode0_len = 0;
168 struct list_head *muxmodes = &partition->muxmodes;
169
170 mode_name = strchr(muxname, '.');
171 if (mode_name) {
172 mode0_len = strlen(muxname) - strlen(mode_name);
173 mode_name++;
174 } else {
175 mode_name = muxname;
176 }
177
178 list_for_each_entry(e, muxmodes, node) {
179 char *m0_entry;
180 int i;
181
182 mux = &e->mux;
183 m0_entry = mux->muxnames[0];
184
185 /* First check for full name in mode0.muxmode format */
186 if (mode0_len)
187 if (strncmp(muxname, m0_entry, mode0_len) ||
188 (strlen(m0_entry) != mode0_len))
189 continue;
190
191 /* Then check for muxmode only */
192 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
193 char *mode_cur = mux->muxnames[i];
194
195 if (!mode_cur)
196 continue;
197
198 if (!strcmp(mode_name, mode_cur)) {
199 *found_mux = mux;
200 found++;
201 found_mode = i;
202 }
203 }
204 }
205
206 if (found == 1) {
207 return found_mode;
208 }
209
210 if (found > 1) {
211 pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
212 found, muxname);
213 return -EINVAL;
214 }
215
216 return -ENODEV;
217}
218
219int __init omap_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 pr_err("%s: Could not find signal %s\n", __func__, muxname);
238
239 return -ENODEV;
240}
241
242int __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
262struct omap_hwmod_mux_info * __init
263omap_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
348err3:
349 kfree(hmux->pads);
350err2:
351 kfree(hmux);
352err1:
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 */
369static 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 */
409static 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 */
424static 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 */
431void 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 */
514static 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
570static 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
611static 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
616static 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
623static 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
642static 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
680static 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 struct seq_file *seqf;
685 struct omap_mux *m;
686 u16 val;
687 int ret;
688 struct omap_mux_partition *partition;
689
690 if (count > OMAP_MUX_MAX_ARG_CHAR)
691 return -EINVAL;
692
693 ret = kstrtou16_from_user(user_buf, count, 0x10, &val);
694 if (ret < 0)
695 return ret;
696
697 seqf = file->private_data;
698 m = seqf->private;
699
700 partition = omap_mux_get_partition(m);
701 if (!partition)
702 return -ENODEV;
703
704 omap_mux_write(partition, val, m->reg_offset);
705 *ppos += count;
706
707 return count;
708}
709
710static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
711{
712 return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
713}
714
715static const struct file_operations omap_mux_dbg_signal_fops = {
716 .open = omap_mux_dbg_signal_open,
717 .read = seq_read,
718 .write = omap_mux_dbg_signal_write,
719 .llseek = seq_lseek,
720 .release = single_release,
721};
722
723static struct dentry *mux_dbg_dir;
724
725static void __init omap_mux_dbg_create_entry(
726 struct omap_mux_partition *partition,
727 struct dentry *mux_dbg_dir)
728{
729 struct omap_mux_entry *e;
730
731 list_for_each_entry(e, &partition->muxmodes, node) {
732 struct omap_mux *m = &e->mux;
733
734 (void)debugfs_create_file(m->muxnames[0], S_IWUSR | S_IRUGO,
735 mux_dbg_dir, m,
736 &omap_mux_dbg_signal_fops);
737 }
738}
739
740static void __init omap_mux_dbg_init(void)
741{
742 struct omap_mux_partition *partition;
743 static struct dentry *mux_dbg_board_dir;
744
745 mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
746 if (!mux_dbg_dir)
747 return;
748
749 mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
750 if (!mux_dbg_board_dir)
751 return;
752
753 list_for_each_entry(partition, &mux_partitions, node) {
754 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
755 (void)debugfs_create_file(partition->name, S_IRUGO,
756 mux_dbg_board_dir, partition,
757 &omap_mux_dbg_board_fops);
758 }
759}
760
761#else
762static inline void omap_mux_dbg_init(void)
763{
764}
765#endif /* CONFIG_DEBUG_FS */
766
767static void __init omap_mux_free_names(struct omap_mux *m)
768{
769 int i;
770
771 for (i = 0; i < OMAP_MUX_NR_MODES; i++)
772 kfree(m->muxnames[i]);
773
774#ifdef CONFIG_DEBUG_FS
775 for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
776 kfree(m->balls[i]);
777#endif
778
779}
780
781/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
782int __init omap_mux_late_init(void)
783{
784 struct omap_mux_partition *partition;
785 int ret;
786
787 list_for_each_entry(partition, &mux_partitions, node) {
788 struct omap_mux_entry *e, *tmp;
789 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
790 struct omap_mux *m = &e->mux;
791 u16 mode = omap_mux_read(partition, m->reg_offset);
792
793 if (OMAP_MODE_GPIO(partition, mode))
794 continue;
795
796#ifndef CONFIG_DEBUG_FS
797 mutex_lock(&muxmode_mutex);
798 list_del(&e->node);
799 mutex_unlock(&muxmode_mutex);
800 omap_mux_free_names(m);
801 kfree(m);
802#endif
803 }
804 }
805
806 omap_mux_dbg_init();
807
808 /* see pinctrl-single-omap for the wake-up interrupt handling */
809 if (of_have_populated_dt())
810 return 0;
811
812 ret = request_irq(omap_prcm_event_to_irq("io"),
813 omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,
814 "hwmod_io", omap_mux_late_init);
815
816 if (ret)
817 pr_warn("mux: Failed to setup hwmod io irq %d\n", ret);
818
819 return 0;
820}
821
822static void __init omap_mux_package_fixup(struct omap_mux *p,
823 struct omap_mux *superset)
824{
825 while (p->reg_offset != OMAP_MUX_TERMINATOR) {
826 struct omap_mux *s = superset;
827 int found = 0;
828
829 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
830 if (s->reg_offset == p->reg_offset) {
831 *s = *p;
832 found++;
833 break;
834 }
835 s++;
836 }
837 if (!found)
838 pr_err("%s: Unknown entry offset 0x%x\n", __func__,
839 p->reg_offset);
840 p++;
841 }
842}
843
844#ifdef CONFIG_DEBUG_FS
845
846static void __init omap_mux_package_init_balls(struct omap_ball *b,
847 struct omap_mux *superset)
848{
849 while (b->reg_offset != OMAP_MUX_TERMINATOR) {
850 struct omap_mux *s = superset;
851 int found = 0;
852
853 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
854 if (s->reg_offset == b->reg_offset) {
855 s->balls[0] = b->balls[0];
856 s->balls[1] = b->balls[1];
857 found++;
858 break;
859 }
860 s++;
861 }
862 if (!found)
863 pr_err("%s: Unknown ball offset 0x%x\n", __func__,
864 b->reg_offset);
865 b++;
866 }
867}
868
869#else /* CONFIG_DEBUG_FS */
870
871static inline void omap_mux_package_init_balls(struct omap_ball *b,
872 struct omap_mux *superset)
873{
874}
875
876#endif /* CONFIG_DEBUG_FS */
877
878static int __init omap_mux_setup(char *options)
879{
880 if (!options)
881 return 0;
882
883 omap_mux_options = options;
884
885 return 1;
886}
887__setup("omap_mux=", omap_mux_setup);
888
889/*
890 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
891 * cmdline options only override the bootloader values.
892 * During development, please enable CONFIG_DEBUG_FS, and use the
893 * signal specific entries under debugfs.
894 */
895static void __init omap_mux_set_cmdline_signals(void)
896{
897 char *options, *next_opt, *token;
898
899 if (!omap_mux_options)
900 return;
901
902 options = kstrdup(omap_mux_options, GFP_KERNEL);
903 if (!options)
904 return;
905
906 next_opt = options;
907
908 while ((token = strsep(&next_opt, ",")) != NULL) {
909 char *keyval, *name;
910 u16 val;
911
912 keyval = token;
913 name = strsep(&keyval, "=");
914 if (name) {
915 int res;
916
917 res = kstrtou16(keyval, 0x10, &val);
918 if (res < 0)
919 continue;
920
921 omap_mux_init_signal(name, (u16)val);
922 }
923 }
924
925 kfree(options);
926}
927
928static int __init omap_mux_copy_names(struct omap_mux *src,
929 struct omap_mux *dst)
930{
931 int i;
932
933 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
934 if (src->muxnames[i]) {
935 dst->muxnames[i] = kstrdup(src->muxnames[i],
936 GFP_KERNEL);
937 if (!dst->muxnames[i])
938 goto free;
939 }
940 }
941
942#ifdef CONFIG_DEBUG_FS
943 for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
944 if (src->balls[i]) {
945 dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
946 if (!dst->balls[i])
947 goto free;
948 }
949 }
950#endif
951
952 return 0;
953
954free:
955 omap_mux_free_names(dst);
956 return -ENOMEM;
957
958}
959
960#endif /* CONFIG_OMAP_MUX */
961
962static struct omap_mux *omap_mux_get_by_gpio(
963 struct omap_mux_partition *partition,
964 int gpio)
965{
966 struct omap_mux_entry *e;
967 struct omap_mux *ret = NULL;
968
969 list_for_each_entry(e, &partition->muxmodes, node) {
970 struct omap_mux *m = &e->mux;
971 if (m->gpio == gpio) {
972 ret = m;
973 break;
974 }
975 }
976
977 return ret;
978}
979
980/* Needed for dynamic muxing of GPIO pins for off-idle */
981u16 omap_mux_get_gpio(int gpio)
982{
983 struct omap_mux_partition *partition;
984 struct omap_mux *m = NULL;
985
986 list_for_each_entry(partition, &mux_partitions, node) {
987 m = omap_mux_get_by_gpio(partition, gpio);
988 if (m)
989 return omap_mux_read(partition, m->reg_offset);
990 }
991
992 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
993 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
994
995 return OMAP_MUX_TERMINATOR;
996}
997
998/* Needed for dynamic muxing of GPIO pins for off-idle */
999void omap_mux_set_gpio(u16 val, int gpio)
1000{
1001 struct omap_mux_partition *partition;
1002 struct omap_mux *m = NULL;
1003
1004 list_for_each_entry(partition, &mux_partitions, node) {
1005 m = omap_mux_get_by_gpio(partition, gpio);
1006 if (m) {
1007 omap_mux_write(partition, val, m->reg_offset);
1008 return;
1009 }
1010 }
1011
1012 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
1013 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
1014}
1015
1016static struct omap_mux * __init omap_mux_list_add(
1017 struct omap_mux_partition *partition,
1018 struct omap_mux *src)
1019{
1020 struct omap_mux_entry *entry;
1021 struct omap_mux *m;
1022
1023 entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
1024 if (!entry)
1025 return NULL;
1026
1027 m = &entry->mux;
1028 entry->mux = *src;
1029
1030#ifdef CONFIG_OMAP_MUX
1031 if (omap_mux_copy_names(src, m)) {
1032 kfree(entry);
1033 return NULL;
1034 }
1035#endif
1036
1037 mutex_lock(&muxmode_mutex);
1038 list_add_tail(&entry->node, &partition->muxmodes);
1039 mutex_unlock(&muxmode_mutex);
1040
1041 return m;
1042}
1043
1044/*
1045 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
1046 * the GPIO to mux offset mapping that is needed for dynamic muxing
1047 * of GPIO pins for off-idle.
1048 */
1049static void __init omap_mux_init_list(struct omap_mux_partition *partition,
1050 struct omap_mux *superset)
1051{
1052 while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
1053 struct omap_mux *entry;
1054
1055#ifdef CONFIG_OMAP_MUX
1056 if (!superset->muxnames[0]) {
1057 superset++;
1058 continue;
1059 }
1060#else
1061 /* Skip pins that are not muxed as GPIO by bootloader */
1062 if (!OMAP_MODE_GPIO(partition, omap_mux_read(partition,
1063 superset->reg_offset))) {
1064 superset++;
1065 continue;
1066 }
1067#endif
1068
1069 entry = omap_mux_list_add(partition, superset);
1070 if (!entry) {
1071 pr_err("%s: Could not add entry\n", __func__);
1072 return;
1073 }
1074 superset++;
1075 }
1076}
1077
1078#ifdef CONFIG_OMAP_MUX
1079
1080static void omap_mux_init_package(struct omap_mux *superset,
1081 struct omap_mux *package_subset,
1082 struct omap_ball *package_balls)
1083{
1084 if (package_subset)
1085 omap_mux_package_fixup(package_subset, superset);
1086 if (package_balls)
1087 omap_mux_package_init_balls(package_balls, superset);
1088}
1089
1090static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1091 struct omap_board_mux *board_mux)
1092{
1093 omap_mux_set_cmdline_signals();
1094 omap_mux_write_array(partition, board_mux);
1095}
1096
1097#else
1098
1099static void omap_mux_init_package(struct omap_mux *superset,
1100 struct omap_mux *package_subset,
1101 struct omap_ball *package_balls)
1102{
1103}
1104
1105static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1106 struct omap_board_mux *board_mux)
1107{
1108}
1109
1110#endif
1111
1112static u32 mux_partitions_cnt;
1113
1114int __init omap_mux_init(const char *name, u32 flags,
1115 u32 mux_pbase, u32 mux_size,
1116 struct omap_mux *superset,
1117 struct omap_mux *package_subset,
1118 struct omap_board_mux *board_mux,
1119 struct omap_ball *package_balls)
1120{
1121 struct omap_mux_partition *partition;
1122
1123 partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1124 if (!partition)
1125 return -ENOMEM;
1126
1127 partition->name = name;
1128 partition->flags = flags;
1129 partition->gpio = flags & OMAP_MUX_MODE7;
1130 partition->size = mux_size;
1131 partition->phys = mux_pbase;
1132 partition->base = ioremap(mux_pbase, mux_size);
1133 if (!partition->base) {
1134 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1135 __func__, partition->phys);
1136 kfree(partition);
1137 return -ENODEV;
1138 }
1139
1140 INIT_LIST_HEAD(&partition->muxmodes);
1141
1142 list_add_tail(&partition->node, &mux_partitions);
1143 mux_partitions_cnt++;
1144 pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1145 mux_partitions_cnt, partition->name, partition->flags);
1146
1147 omap_mux_init_package(superset, package_subset, package_balls);
1148 omap_mux_init_list(partition, superset);
1149 omap_mux_init_signals(partition, board_mux);
1150
1151 return 0;
1152}
1153