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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / arch / arm / mach-omap2 / mux.c
blob94c2f6d17dae287d632ea8b9b66363a1431b69cd
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
50 struct omap_mux_entry {
51 struct omap_mux mux;
52 struct list_head node;
53 };
54
55 static LIST_HEAD(mux_partitions);
56 static DEFINE_MUTEX(muxmode_mutex);
57
58 struct 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
70 u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
71 {
72 if (partition->flags & OMAP_MUX_REG_8BIT)
73 return __raw_readb(partition->base + reg);
74 else
75 return __raw_readw(partition->base + reg);
76 }
77
78 void omap_mux_write(struct omap_mux_partition *partition, u16 val,
79 u16 reg)
80 {
81 if (partition->flags & OMAP_MUX_REG_8BIT)
82 __raw_writeb(val, partition->base + reg);
83 else
84 __raw_writew(val, partition->base + reg);
85 }
86
87 void 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
102 static char *omap_mux_options;
103
104 static 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
146 int __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
160 static 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
219 int __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
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 | S_IRUGO,
745 mux_dbg_dir, m,
746 &omap_mux_dbg_signal_fops);
747 }
748 }
749
750 static void __init omap_mux_dbg_init(void)
751 {
752 struct omap_mux_partition *partition;
753 static struct dentry *mux_dbg_board_dir;
754
755 mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
756 if (!mux_dbg_dir)
757 return;
758
759 mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
760 if (!mux_dbg_board_dir)
761 return;
762
763 list_for_each_entry(partition, &mux_partitions, node) {
764 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
765 (void)debugfs_create_file(partition->name, S_IRUGO,
766 mux_dbg_board_dir, partition,
767 &omap_mux_dbg_board_fops);
768 }
769 }
770
771 #else
772 static inline void omap_mux_dbg_init(void)
773 {
774 }
775 #endif /* CONFIG_DEBUG_FS */
776
777 static void __init omap_mux_free_names(struct omap_mux *m)
778 {
779 int i;
780
781 for (i = 0; i < OMAP_MUX_NR_MODES; i++)
782 kfree(m->muxnames[i]);
783
784 #ifdef CONFIG_DEBUG_FS
785 for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
786 kfree(m->balls[i]);
787 #endif
788
789 }
790
791 /* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
792 int __init omap_mux_late_init(void)
793 {
794 struct omap_mux_partition *partition;
795 int ret;
796
797 list_for_each_entry(partition, &mux_partitions, node) {
798 struct omap_mux_entry *e, *tmp;
799 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
800 struct omap_mux *m = &e->mux;
801 u16 mode = omap_mux_read(partition, m->reg_offset);
802
803 if (OMAP_MODE_GPIO(partition, mode))
804 continue;
805
806 #ifndef CONFIG_DEBUG_FS
807 mutex_lock(&muxmode_mutex);
808 list_del(&e->node);
809 mutex_unlock(&muxmode_mutex);
810 omap_mux_free_names(m);
811 kfree(m);
812 #endif
813 }
814 }
815
816 ret = request_irq(omap_prcm_event_to_irq("io"),
817 omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,
818 "hwmod_io", omap_mux_late_init);
819
820 if (ret)
821 pr_warning("mux: Failed to setup hwmod io irq %d\n", ret);
822
823 omap_mux_dbg_init();
824
825 return 0;
826 }
827
828 static void __init omap_mux_package_fixup(struct omap_mux *p,
829 struct omap_mux *superset)
830 {
831 while (p->reg_offset != OMAP_MUX_TERMINATOR) {
832 struct omap_mux *s = superset;
833 int found = 0;
834
835 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
836 if (s->reg_offset == p->reg_offset) {
837 *s = *p;
838 found++;
839 break;
840 }
841 s++;
842 }
843 if (!found)
844 pr_err("%s: Unknown entry offset 0x%x\n", __func__,
845 p->reg_offset);
846 p++;
847 }
848 }
849
850 #ifdef CONFIG_DEBUG_FS
851
852 static void __init omap_mux_package_init_balls(struct omap_ball *b,
853 struct omap_mux *superset)
854 {
855 while (b->reg_offset != OMAP_MUX_TERMINATOR) {
856 struct omap_mux *s = superset;
857 int found = 0;
858
859 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
860 if (s->reg_offset == b->reg_offset) {
861 s->balls[0] = b->balls[0];
862 s->balls[1] = b->balls[1];
863 found++;
864 break;
865 }
866 s++;
867 }
868 if (!found)
869 pr_err("%s: Unknown ball offset 0x%x\n", __func__,
870 b->reg_offset);
871 b++;
872 }
873 }
874
875 #else /* CONFIG_DEBUG_FS */
876
877 static inline void omap_mux_package_init_balls(struct omap_ball *b,
878 struct omap_mux *superset)
879 {
880 }
881
882 #endif /* CONFIG_DEBUG_FS */
883
884 static int __init omap_mux_setup(char *options)
885 {
886 if (!options)
887 return 0;
888
889 omap_mux_options = options;
890
891 return 1;
892 }
893 __setup("omap_mux=", omap_mux_setup);
894
895 /*
896 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
897 * cmdline options only override the bootloader values.
898 * During development, please enable CONFIG_DEBUG_FS, and use the
899 * signal specific entries under debugfs.
900 */
901 static void __init omap_mux_set_cmdline_signals(void)
902 {
903 char *options, *next_opt, *token;
904
905 if (!omap_mux_options)
906 return;
907
908 options = kstrdup(omap_mux_options, GFP_KERNEL);
909 if (!options)
910 return;
911
912 next_opt = options;
913
914 while ((token = strsep(&next_opt, ",")) != NULL) {
915 char *keyval, *name;
916 unsigned long val;
917
918 keyval = token;
919 name = strsep(&keyval, "=");
920 if (name) {
921 int res;
922
923 res = strict_strtoul(keyval, 0x10, &val);
924 if (res < 0)
925 continue;
926
927 omap_mux_init_signal(name, (u16)val);
928 }
929 }
930
931 kfree(options);
932 }
933
934 static int __init omap_mux_copy_names(struct omap_mux *src,
935 struct omap_mux *dst)
936 {
937 int i;
938
939 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
940 if (src->muxnames[i]) {
941 dst->muxnames[i] = kstrdup(src->muxnames[i],
942 GFP_KERNEL);
943 if (!dst->muxnames[i])
944 goto free;
945 }
946 }
947
948 #ifdef CONFIG_DEBUG_FS
949 for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
950 if (src->balls[i]) {
951 dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
952 if (!dst->balls[i])
953 goto free;
954 }
955 }
956 #endif
957
958 return 0;
959
960 free:
961 omap_mux_free_names(dst);
962 return -ENOMEM;
963
964 }
965
966 #endif /* CONFIG_OMAP_MUX */
967
968 static struct omap_mux *omap_mux_get_by_gpio(
969 struct omap_mux_partition *partition,
970 int gpio)
971 {
972 struct omap_mux_entry *e;
973 struct omap_mux *ret = NULL;
974
975 list_for_each_entry(e, &partition->muxmodes, node) {
976 struct omap_mux *m = &e->mux;
977 if (m->gpio == gpio) {
978 ret = m;
979 break;
980 }
981 }
982
983 return ret;
984 }
985
986 /* Needed for dynamic muxing of GPIO pins for off-idle */
987 u16 omap_mux_get_gpio(int gpio)
988 {
989 struct omap_mux_partition *partition;
990 struct omap_mux *m = NULL;
991
992 list_for_each_entry(partition, &mux_partitions, node) {
993 m = omap_mux_get_by_gpio(partition, gpio);
994 if (m)
995 return omap_mux_read(partition, m->reg_offset);
996 }
997
998 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
999 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
1000
1001 return OMAP_MUX_TERMINATOR;
1002 }
1003
1004 /* Needed for dynamic muxing of GPIO pins for off-idle */
1005 void omap_mux_set_gpio(u16 val, int gpio)
1006 {
1007 struct omap_mux_partition *partition;
1008 struct omap_mux *m = NULL;
1009
1010 list_for_each_entry(partition, &mux_partitions, node) {
1011 m = omap_mux_get_by_gpio(partition, gpio);
1012 if (m) {
1013 omap_mux_write(partition, val, m->reg_offset);
1014 return;
1015 }
1016 }
1017
1018 if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
1019 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
1020 }
1021
1022 static struct omap_mux * __init omap_mux_list_add(
1023 struct omap_mux_partition *partition,
1024 struct omap_mux *src)
1025 {
1026 struct omap_mux_entry *entry;
1027 struct omap_mux *m;
1028
1029 entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
1030 if (!entry)
1031 return NULL;
1032
1033 m = &entry->mux;
1034 entry->mux = *src;
1035
1036 #ifdef CONFIG_OMAP_MUX
1037 if (omap_mux_copy_names(src, m)) {
1038 kfree(entry);
1039 return NULL;
1040 }
1041 #endif
1042
1043 mutex_lock(&muxmode_mutex);
1044 list_add_tail(&entry->node, &partition->muxmodes);
1045 mutex_unlock(&muxmode_mutex);
1046
1047 return m;
1048 }
1049
1050 /*
1051 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
1052 * the GPIO to mux offset mapping that is needed for dynamic muxing
1053 * of GPIO pins for off-idle.
1054 */
1055 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
1056 struct omap_mux *superset)
1057 {
1058 while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
1059 struct omap_mux *entry;
1060
1061 #ifdef CONFIG_OMAP_MUX
1062 if (!superset->muxnames || !superset->muxnames[0]) {
1063 superset++;
1064 continue;
1065 }
1066 #else
1067 /* Skip pins that are not muxed as GPIO by bootloader */
1068 if (!OMAP_MODE_GPIO(partition, omap_mux_read(partition,
1069 superset->reg_offset))) {
1070 superset++;
1071 continue;
1072 }
1073 #endif
1074
1075 entry = omap_mux_list_add(partition, superset);
1076 if (!entry) {
1077 pr_err("%s: Could not add entry\n", __func__);
1078 return;
1079 }
1080 superset++;
1081 }
1082 }
1083
1084 #ifdef CONFIG_OMAP_MUX
1085
1086 static void omap_mux_init_package(struct omap_mux *superset,
1087 struct omap_mux *package_subset,
1088 struct omap_ball *package_balls)
1089 {
1090 if (package_subset)
1091 omap_mux_package_fixup(package_subset, superset);
1092 if (package_balls)
1093 omap_mux_package_init_balls(package_balls, superset);
1094 }
1095
1096 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1097 struct omap_board_mux *board_mux)
1098 {
1099 omap_mux_set_cmdline_signals();
1100 omap_mux_write_array(partition, board_mux);
1101 }
1102
1103 #else
1104
1105 static void omap_mux_init_package(struct omap_mux *superset,
1106 struct omap_mux *package_subset,
1107 struct omap_ball *package_balls)
1108 {
1109 }
1110
1111 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1112 struct omap_board_mux *board_mux)
1113 {
1114 }
1115
1116 #endif
1117
1118 static u32 mux_partitions_cnt;
1119
1120 int __init omap_mux_init(const char *name, u32 flags,
1121 u32 mux_pbase, u32 mux_size,
1122 struct omap_mux *superset,
1123 struct omap_mux *package_subset,
1124 struct omap_board_mux *board_mux,
1125 struct omap_ball *package_balls)
1126 {
1127 struct omap_mux_partition *partition;
1128
1129 partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1130 if (!partition)
1131 return -ENOMEM;
1132
1133 partition->name = name;
1134 partition->flags = flags;
1135 partition->gpio = flags & OMAP_MUX_MODE7;
1136 partition->size = mux_size;
1137 partition->phys = mux_pbase;
1138 partition->base = ioremap(mux_pbase, mux_size);
1139 if (!partition->base) {
1140 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1141 __func__, partition->phys);
1142 kfree(partition);
1143 return -ENODEV;
1144 }
1145
1146 INIT_LIST_HEAD(&partition->muxmodes);
1147
1148 list_add_tail(&partition->node, &mux_partitions);
1149 mux_partitions_cnt++;
1150 pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1151 mux_partitions_cnt, partition->name, partition->flags);
1152
1153 omap_mux_init_package(superset, package_subset, package_balls);
1154 omap_mux_init_list(partition, superset);
1155 omap_mux_init_signals(partition, board_mux);
1156
1157 return 0;
1158 }
1159
Linux with added FPC-III support