arch/arm/mach-omap2/mux.c

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