Pileus Git - ~andy/linux/blob - 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 #include <asm/system.h>
  39
  40 #include <plat/omap_hwmod.h>
  41
  42 #include "control.h"
  43 #include "mux.h"
  44 #include "prm.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 static int __init
 222 omap_mux_get_by_name(const char *muxname,
 223                         struct omap_mux_partition **found_partition,
 224                         struct omap_mux **found_mux)
 225 {
 226         struct omap_mux_partition *partition;
 227
 228         list_for_each_entry(partition, &mux_partitions, node) {
 229                 struct omap_mux *mux = NULL;
 230                 int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
 231                 if (mux_mode < 0)
 232                         continue;
 233
 234                 *found_partition = partition;
 235                 *found_mux = mux;
 236
 237                 return mux_mode;
 238         }
 239
 240         return -ENODEV;
 241 }
 242
 243 int __init omap_mux_init_signal(const char *muxname, int val)
 244 {
 245         struct omap_mux_partition *partition = NULL;
 246         struct omap_mux *mux = NULL;
 247         u16 old_mode;
 248         int mux_mode;
 249
 250         mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
 251         if (mux_mode < 0)
 252                 return mux_mode;
 253
 254         old_mode = omap_mux_read(partition, mux->reg_offset);
 255         mux_mode |= val;
 256         pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
 257                          __func__, muxname, old_mode, mux_mode);
 258         omap_mux_write(partition, mux_mode, mux->reg_offset);
 259
 260         return 0;
 261 }
 262
 263 struct omap_hwmod_mux_info * __init
 264 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
 265 {
 266         struct omap_hwmod_mux_info *hmux;
 267         int i, nr_pads_dynamic = 0;
 268
 269         if (!bpads || nr_pads < 1)
 270                 return NULL;
 271
 272         hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
 273         if (!hmux)
 274                 goto err1;
 275
 276         hmux->nr_pads = nr_pads;
 277
 278         hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
 279                                 nr_pads, GFP_KERNEL);
 280         if (!hmux->pads)
 281                 goto err2;
 282
 283         for (i = 0; i < hmux->nr_pads; i++) {
 284                 struct omap_mux_partition *partition;
 285                 struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
 286                 struct omap_mux *mux;
 287                 int mux_mode;
 288
 289                 mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
 290                 if (mux_mode < 0)
 291                         goto err3;
 292                 if (!pad->partition)
 293                         pad->partition = partition;
 294                 if (!pad->mux)
 295                         pad->mux = mux;
 296
 297                 pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
 298                 if (!pad->name) {
 299                         int j;
 300
 301                         for (j = i - 1; j >= 0; j--)
 302                                 kfree(hmux->pads[j].name);
 303                         goto err3;
 304                 }
 305                 strcpy(pad->name, bpad->name);
 306
 307                 pad->flags = bpad->flags;
 308                 pad->enable = bpad->enable;
 309                 pad->idle = bpad->idle;
 310                 pad->off = bpad->off;
 311
 312                 if (pad->flags &
 313                     (OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP))
 314                         nr_pads_dynamic++;
 315
 316                 pr_debug("%s: Initialized %s\n", __func__, pad->name);
 317         }
 318
 319         if (!nr_pads_dynamic)
 320                 return hmux;
 321
 322         /*
 323          * Add pads that need dynamic muxing into a separate list
 324          */
 325
 326         hmux->nr_pads_dynamic = nr_pads_dynamic;
 327         hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
 328                                         nr_pads_dynamic, GFP_KERNEL);
 329         if (!hmux->pads_dynamic) {
 330                 pr_err("%s: Could not allocate dynamic pads\n", __func__);
 331                 return hmux;
 332         }
 333
 334         nr_pads_dynamic = 0;
 335         for (i = 0; i < hmux->nr_pads; i++) {
 336                 struct omap_device_pad *pad = &hmux->pads[i];
 337
 338                 if (pad->flags &
 339                     (OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP)) {
 340                         pr_debug("%s: pad %s tagged dynamic\n",
 341                                         __func__, pad->name);
 342                         hmux->pads_dynamic[nr_pads_dynamic] = pad;
 343                         nr_pads_dynamic++;
 344                 }
 345         }
 346
 347         return hmux;
 348
 349 err3:
 350         kfree(hmux->pads);
 351 err2:
 352         kfree(hmux);
 353 err1:
 354         pr_err("%s: Could not allocate device mux entry\n", __func__);
 355
 356         return NULL;
 357 }
 358
 359 /**
 360  * omap_hwmod_mux_scan_wakeups - omap hwmod scan wakeup pads
 361  * @hmux: Pads for a hwmod
 362  * @mpu_irqs: MPU irq array for a hwmod
 363  *
 364  * Scans the wakeup status of pads for a single hwmod.  If an irq
 365  * array is defined for this mux, the parser will call the registered
 366  * ISRs for corresponding pads, otherwise the parser will stop at the
 367  * first wakeup active pad and return.  Returns true if there is a
 368  * pending and non-served wakeup event for the mux, otherwise false.
 369  */
 370 static bool omap_hwmod_mux_scan_wakeups(struct omap_hwmod_mux_info *hmux,
 371                 struct omap_hwmod_irq_info *mpu_irqs)
 372 {
 373         int i, irq;
 374         unsigned int val;
 375         u32 handled_irqs = 0;
 376
 377         for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 378                 struct omap_device_pad *pad = hmux->pads_dynamic[i];
 379
 380                 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP) ||
 381                     !(pad->idle & OMAP_WAKEUP_EN))
 382                         continue;
 383
 384                 val = omap_mux_read(pad->partition, pad->mux->reg_offset);
 385                 if (!(val & OMAP_WAKEUP_EVENT))
 386                         continue;
 387
 388                 if (!hmux->irqs)
 389                         return true;
 390
 391                 irq = hmux->irqs[i];
 392                 /* make sure we only handle each irq once */
 393                 if (handled_irqs & 1 << irq)
 394                         continue;
 395
 396                 handled_irqs |= 1 << irq;
 397
 398                 generic_handle_irq(mpu_irqs[irq].irq);
 399         }
 400
 401         return false;
 402 }
 403
 404 /**
 405  * _omap_hwmod_mux_handle_irq - Process wakeup events for a single hwmod
 406  *
 407  * Checks a single hwmod for every wakeup capable pad to see if there is an
 408  * active wakeup event. If this is the case, call the corresponding ISR.
 409  */
 410 static int _omap_hwmod_mux_handle_irq(struct omap_hwmod *oh, void *data)
 411 {
 412         if (!oh->mux || !oh->mux->enabled)
 413                 return 0;
 414         if (omap_hwmod_mux_scan_wakeups(oh->mux, oh->mpu_irqs))
 415                 generic_handle_irq(oh->mpu_irqs[0].irq);
 416         return 0;
 417 }
 418
 419 /**
 420  * omap_hwmod_mux_handle_irq - Process pad wakeup irqs.
 421  *
 422  * Calls a function for each registered omap_hwmod to check
 423  * pad wakeup statuses.
 424  */
 425 static irqreturn_t omap_hwmod_mux_handle_irq(int irq, void *unused)
 426 {
 427         omap_hwmod_for_each(_omap_hwmod_mux_handle_irq, NULL);
 428         return IRQ_HANDLED;
 429 }
 430
 431 /* Assumes the calling function takes care of locking */
 432 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 433 {
 434         int i;
 435
 436         /* Runtime idling of dynamic pads */
 437         if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
 438                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 439                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 440                         int val = -EINVAL;
 441
 442                         val = pad->idle;
 443                         omap_mux_write(pad->partition, val,
 444                                         pad->mux->reg_offset);
 445                 }
 446
 447                 return;
 448         }
 449
 450         /* Runtime enabling of dynamic pads */
 451         if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic
 452                                         && hmux->enabled) {
 453                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 454                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 455                         int val = -EINVAL;
 456
 457                         val = pad->enable;
 458                         omap_mux_write(pad->partition, val,
 459                                         pad->mux->reg_offset);
 460                 }
 461
 462                 return;
 463         }
 464
 465         /* Enabling or disabling of all pads */
 466         for (i = 0; i < hmux->nr_pads; i++) {
 467                 struct omap_device_pad *pad = &hmux->pads[i];
 468                 int flags, val = -EINVAL;
 469
 470                 flags = pad->flags;
 471
 472                 switch (state) {
 473                 case _HWMOD_STATE_ENABLED:
 474                         val = pad->enable;
 475                         pr_debug("%s: Enabling %s %x\n", __func__,
 476                                         pad->name, val);
 477                         break;
 478                 case _HWMOD_STATE_DISABLED:
 479                         /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
 480                         if (flags & OMAP_DEVICE_PAD_REMUX)
 481                                 val = pad->off;
 482                         else
 483                                 val = OMAP_MUX_MODE7;
 484                         pr_debug("%s: Disabling %s %x\n", __func__,
 485                                         pad->name, val);
 486                         break;
 487                 default:
 488                         /* Nothing to be done */
 489                         break;
 490                 };
 491
 492                 if (val >= 0) {
 493                         omap_mux_write(pad->partition, val,
 494                                         pad->mux->reg_offset);
 495                         pad->flags = flags;
 496                 }
 497         }
 498
 499         if (state == _HWMOD_STATE_ENABLED)
 500                 hmux->enabled = true;
 501         else
 502                 hmux->enabled = false;
 503 }
 504
 505 #ifdef CONFIG_DEBUG_FS
 506
 507 #define OMAP_MUX_MAX_NR_FLAGS   10
 508 #define OMAP_MUX_TEST_FLAG(val, mask)                           \
 509         if (((val) & (mask)) == (mask)) {                       \
 510                 i++;                                            \
 511                 flags[i] =  #mask;                              \
 512         }
 513
 514 /* REVISIT: Add checking for non-optimal mux settings */
 515 static inline void omap_mux_decode(struct seq_file *s, u16 val)
 516 {
 517         char *flags[OMAP_MUX_MAX_NR_FLAGS];
 518         char mode[sizeof("OMAP_MUX_MODE") + 1];
 519         int i = -1;
 520
 521         sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
 522         i++;
 523         flags[i] = mode;
 524
 525         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
 526         if (val & OMAP_OFF_EN) {
 527                 if (!(val & OMAP_OFFOUT_EN)) {
 528                         if (!(val & OMAP_OFF_PULL_UP)) {
 529                                 OMAP_MUX_TEST_FLAG(val,
 530                                         OMAP_PIN_OFF_INPUT_PULLDOWN);
 531                         } else {
 532                                 OMAP_MUX_TEST_FLAG(val,
 533                                         OMAP_PIN_OFF_INPUT_PULLUP);
 534                         }
 535                 } else {
 536                         if (!(val & OMAP_OFFOUT_VAL)) {
 537                                 OMAP_MUX_TEST_FLAG(val,
 538                                         OMAP_PIN_OFF_OUTPUT_LOW);
 539                         } else {
 540                                 OMAP_MUX_TEST_FLAG(val,
 541                                         OMAP_PIN_OFF_OUTPUT_HIGH);
 542                         }
 543                 }
 544         }
 545
 546         if (val & OMAP_INPUT_EN) {
 547                 if (val & OMAP_PULL_ENA) {
 548                         if (!(val & OMAP_PULL_UP)) {
 549                                 OMAP_MUX_TEST_FLAG(val,
 550                                         OMAP_PIN_INPUT_PULLDOWN);
 551                         } else {
 552                                 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
 553                         }
 554                 } else {
 555                         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
 556                 }
 557         } else {
 558                 i++;
 559                 flags[i] = "OMAP_PIN_OUTPUT";
 560         }
 561
 562         do {
 563                 seq_printf(s, "%s", flags[i]);
 564                 if (i > 0)
 565                         seq_printf(s, " | ");
 566         } while (i-- > 0);
 567 }
 568
 569 #define OMAP_MUX_DEFNAME_LEN    32
 570
 571 static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
 572 {
 573         struct omap_mux_partition *partition = s->private;
 574         struct omap_mux_entry *e;
 575         u8 omap_gen = omap_rev() >> 28;
 576
 577         list_for_each_entry(e, &partition->muxmodes, node) {
 578                 struct omap_mux *m = &e->mux;
 579                 char m0_def[OMAP_MUX_DEFNAME_LEN];
 580                 char *m0_name = m->muxnames[0];
 581                 u16 val;
 582                 int i, mode;
 583
 584                 if (!m0_name)
 585                         continue;
 586
 587                 /* REVISIT: Needs to be updated if mode0 names get longer */
 588                 for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
 589                         if (m0_name[i] == '\0') {
 590                                 m0_def[i] = m0_name[i];
 591                                 break;
 592                         }
 593                         m0_def[i] = toupper(m0_name[i]);
 594                 }
 595                 val = omap_mux_read(partition, m->reg_offset);
 596                 mode = val & OMAP_MUX_MODE7;
 597                 if (mode != 0)
 598                         seq_printf(s, "/* %s */\n", m->muxnames[mode]);
 599
 600                 /*
 601                  * XXX: Might be revisited to support differences across
 602                  * same OMAP generation.
 603                  */
 604                 seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
 605                 omap_mux_decode(s, val);
 606                 seq_printf(s, "),\n");
 607         }
 608
 609         return 0;
 610 }
 611
 612 static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
 613 {
 614         return single_open(file, omap_mux_dbg_board_show, inode->i_private);
 615 }
 616
 617 static const struct file_operations omap_mux_dbg_board_fops = {
 618         .open           = omap_mux_dbg_board_open,
 619         .read           = seq_read,
 620         .llseek         = seq_lseek,
 621         .release        = single_release,
 622 };
 623
 624 static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
 625 {
 626         struct omap_mux_partition *partition;
 627
 628         list_for_each_entry(partition, &mux_partitions, node) {
 629                 struct list_head *muxmodes = &partition->muxmodes;
 630                 struct omap_mux_entry *e;
 631
 632                 list_for_each_entry(e, muxmodes, node) {
 633                         struct omap_mux *m = &e->mux;
 634
 635                         if (m == mux)
 636                                 return partition;
 637                 }
 638         }
 639
 640         return NULL;
 641 }
 642
 643 static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
 644 {
 645         struct omap_mux *m = s->private;
 646         struct omap_mux_partition *partition;
 647         const char *none = "NA";
 648         u16 val;
 649         int mode;
 650
 651         partition = omap_mux_get_partition(m);
 652         if (!partition)
 653                 return 0;
 654
 655         val = omap_mux_read(partition, m->reg_offset);
 656         mode = val & OMAP_MUX_MODE7;
 657
 658         seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
 659                         m->muxnames[0], m->muxnames[mode],
 660                         partition->phys + m->reg_offset, m->reg_offset, val,
 661                         m->balls[0] ? m->balls[0] : none,
 662                         m->balls[1] ? m->balls[1] : none);
 663         seq_printf(s, "mode: ");
 664         omap_mux_decode(s, val);
 665         seq_printf(s, "\n");
 666         seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
 667                         m->muxnames[0] ? m->muxnames[0] : none,
 668                         m->muxnames[1] ? m->muxnames[1] : none,
 669                         m->muxnames[2] ? m->muxnames[2] : none,
 670                         m->muxnames[3] ? m->muxnames[3] : none,
 671                         m->muxnames[4] ? m->muxnames[4] : none,
 672                         m->muxnames[5] ? m->muxnames[5] : none,
 673                         m->muxnames[6] ? m->muxnames[6] : none,
 674                         m->muxnames[7] ? m->muxnames[7] : none);
 675
 676         return 0;
 677 }
 678
 679 #define OMAP_MUX_MAX_ARG_CHAR  7
 680
 681 static ssize_t omap_mux_dbg_signal_write(struct file *file,
 682                                          const char __user *user_buf,
 683                                          size_t count, loff_t *ppos)
 684 {
 685         char buf[OMAP_MUX_MAX_ARG_CHAR];
 686         struct seq_file *seqf;
 687         struct omap_mux *m;
 688         unsigned long val;
 689         int buf_size, ret;
 690         struct omap_mux_partition *partition;
 691
 692         if (count > OMAP_MUX_MAX_ARG_CHAR)
 693                 return -EINVAL;
 694
 695         memset(buf, 0, sizeof(buf));
 696         buf_size = min(count, sizeof(buf) - 1);
 697
 698         if (copy_from_user(buf, user_buf, buf_size))
 699                 return -EFAULT;
 700
 701         ret = strict_strtoul(buf, 0x10, &val);
 702         if (ret < 0)
 703                 return ret;
 704
 705         if (val > 0xffff)
 706                 return -EINVAL;
 707
 708         seqf = file->private_data;
 709         m = seqf->private;
 710
 711         partition = omap_mux_get_partition(m);
 712         if (!partition)
 713                 return -ENODEV;
 714
 715         omap_mux_write(partition, (u16)val, m->reg_offset);
 716         *ppos += count;
 717
 718         return count;
 719 }
 720
 721 static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
 722 {
 723         return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
 724 }
 725
 726 static const struct file_operations omap_mux_dbg_signal_fops = {
 727         .open           = omap_mux_dbg_signal_open,
 728         .read           = seq_read,
 729         .write          = omap_mux_dbg_signal_write,
 730         .llseek         = seq_lseek,
 731         .release        = single_release,
 732 };
 733
 734 static struct dentry *mux_dbg_dir;
 735
 736 static void __init omap_mux_dbg_create_entry(
 737                                 struct omap_mux_partition *partition,
 738                                 struct dentry *mux_dbg_dir)
 739 {
 740         struct omap_mux_entry *e;
 741
 742         list_for_each_entry(e, &partition->muxmodes, node) {
 743                 struct omap_mux *m = &e->mux;
 744
 745                 (void)debugfs_create_file(m->muxnames[0], S_IWUSR, mux_dbg_dir,
 746                                           m, &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 static 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(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 late_initcall(omap_mux_late_init);
 828
 829 static void __init omap_mux_package_fixup(struct omap_mux *p,
 830                                         struct omap_mux *superset)
 831 {
 832         while (p->reg_offset !=  OMAP_MUX_TERMINATOR) {
 833                 struct omap_mux *s = superset;
 834                 int found = 0;
 835
 836                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 837                         if (s->reg_offset == p->reg_offset) {
 838                                 *s = *p;
 839                                 found++;
 840                                 break;
 841                         }
 842                         s++;
 843                 }
 844                 if (!found)
 845                         pr_err("%s: Unknown entry offset 0x%x\n", __func__,
 846                                p->reg_offset);
 847                 p++;
 848         }
 849 }
 850
 851 #ifdef CONFIG_DEBUG_FS
 852
 853 static void __init omap_mux_package_init_balls(struct omap_ball *b,
 854                                 struct omap_mux *superset)
 855 {
 856         while (b->reg_offset != OMAP_MUX_TERMINATOR) {
 857                 struct omap_mux *s = superset;
 858                 int found = 0;
 859
 860                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 861                         if (s->reg_offset == b->reg_offset) {
 862                                 s->balls[0] = b->balls[0];
 863                                 s->balls[1] = b->balls[1];
 864                                 found++;
 865                                 break;
 866                         }
 867                         s++;
 868                 }
 869                 if (!found)
 870                         pr_err("%s: Unknown ball offset 0x%x\n", __func__,
 871                                b->reg_offset);
 872                 b++;
 873         }
 874 }
 875
 876 #else   /* CONFIG_DEBUG_FS */
 877
 878 static inline void omap_mux_package_init_balls(struct omap_ball *b,
 879                                         struct omap_mux *superset)
 880 {
 881 }
 882
 883 #endif  /* CONFIG_DEBUG_FS */
 884
 885 static int __init omap_mux_setup(char *options)
 886 {
 887         if (!options)
 888                 return 0;
 889
 890         omap_mux_options = options;
 891
 892         return 1;
 893 }
 894 __setup("omap_mux=", omap_mux_setup);
 895
 896 /*
 897  * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
 898  * cmdline options only override the bootloader values.
 899  * During development, please enable CONFIG_DEBUG_FS, and use the
 900  * signal specific entries under debugfs.
 901  */
 902 static void __init omap_mux_set_cmdline_signals(void)
 903 {
 904         char *options, *next_opt, *token;
 905
 906         if (!omap_mux_options)
 907                 return;
 908
 909         options = kstrdup(omap_mux_options, GFP_KERNEL);
 910         if (!options)
 911                 return;
 912
 913         next_opt = options;
 914
 915         while ((token = strsep(&next_opt, ",")) != NULL) {
 916                 char *keyval, *name;
 917                 unsigned long val;
 918
 919                 keyval = token;
 920                 name = strsep(&keyval, "=");
 921                 if (name) {
 922                         int res;
 923
 924                         res = strict_strtoul(keyval, 0x10, &val);
 925                         if (res < 0)
 926                                 continue;
 927
 928                         omap_mux_init_signal(name, (u16)val);
 929                 }
 930         }
 931
 932         kfree(options);
 933 }
 934
 935 static int __init omap_mux_copy_names(struct omap_mux *src,
 936                                       struct omap_mux *dst)
 937 {
 938         int i;
 939
 940         for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 941                 if (src->muxnames[i]) {
 942                         dst->muxnames[i] = kstrdup(src->muxnames[i],
 943                                                    GFP_KERNEL);
 944                         if (!dst->muxnames[i])
 945                                 goto free;
 946                 }
 947         }
 948
 949 #ifdef CONFIG_DEBUG_FS
 950         for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
 951                 if (src->balls[i]) {
 952                         dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
 953                         if (!dst->balls[i])
 954                                 goto free;
 955                 }
 956         }
 957 #endif
 958
 959         return 0;
 960
 961 free:
 962         omap_mux_free_names(dst);
 963         return -ENOMEM;
 964
 965 }
 966
 967 #endif  /* CONFIG_OMAP_MUX */
 968
 969 static struct omap_mux *omap_mux_get_by_gpio(
 970                                 struct omap_mux_partition *partition,
 971                                 int gpio)
 972 {
 973         struct omap_mux_entry *e;
 974         struct omap_mux *ret = NULL;
 975
 976         list_for_each_entry(e, &partition->muxmodes, node) {
 977                 struct omap_mux *m = &e->mux;
 978                 if (m->gpio == gpio) {
 979                         ret = m;
 980                         break;
 981                 }
 982         }
 983
 984         return ret;
 985 }
 986
 987 /* Needed for dynamic muxing of GPIO pins for off-idle */
 988 u16 omap_mux_get_gpio(int gpio)
 989 {
 990         struct omap_mux_partition *partition;
 991         struct omap_mux *m = NULL;
 992
 993         list_for_each_entry(partition, &mux_partitions, node) {
 994                 m = omap_mux_get_by_gpio(partition, gpio);
 995                 if (m)
 996                         return omap_mux_read(partition, m->reg_offset);
 997         }
 998
 999         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
1000                 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
1001
1002         return OMAP_MUX_TERMINATOR;
1003 }
1004
1005 /* Needed for dynamic muxing of GPIO pins for off-idle */
1006 void omap_mux_set_gpio(u16 val, int gpio)
1007 {
1008         struct omap_mux_partition *partition;
1009         struct omap_mux *m = NULL;
1010
1011         list_for_each_entry(partition, &mux_partitions, node) {
1012                 m = omap_mux_get_by_gpio(partition, gpio);
1013                 if (m) {
1014                         omap_mux_write(partition, val, m->reg_offset);
1015                         return;
1016                 }
1017         }
1018
1019         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
1020                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
1021 }
1022
1023 static struct omap_mux * __init omap_mux_list_add(
1024                                         struct omap_mux_partition *partition,
1025                                         struct omap_mux *src)
1026 {
1027         struct omap_mux_entry *entry;
1028         struct omap_mux *m;
1029
1030         entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
1031         if (!entry)
1032                 return NULL;
1033
1034         m = &entry->mux;
1035         entry->mux = *src;
1036
1037 #ifdef CONFIG_OMAP_MUX
1038         if (omap_mux_copy_names(src, m)) {
1039                 kfree(entry);
1040                 return NULL;
1041         }
1042 #endif
1043
1044         mutex_lock(&muxmode_mutex);
1045         list_add_tail(&entry->node, &partition->muxmodes);
1046         mutex_unlock(&muxmode_mutex);
1047
1048         return m;
1049 }
1050
1051 /*
1052  * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
1053  * the GPIO to mux offset mapping that is needed for dynamic muxing
1054  * of GPIO pins for off-idle.
1055  */
1056 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
1057                                       struct omap_mux *superset)
1058 {
1059         while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
1060                 struct omap_mux *entry;
1061
1062 #ifdef CONFIG_OMAP_MUX
1063                 if (!superset->muxnames || !superset->muxnames[0]) {
1064                         superset++;
1065                         continue;
1066                 }
1067 #else
1068                 /* Skip pins that are not muxed as GPIO by bootloader */
1069                 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
1070                                     superset->reg_offset))) {
1071                         superset++;
1072                         continue;
1073                 }
1074 #endif
1075
1076                 entry = omap_mux_list_add(partition, superset);
1077                 if (!entry) {
1078                         pr_err("%s: Could not add entry\n", __func__);
1079                         return;
1080                 }
1081                 superset++;
1082         }
1083 }
1084
1085 #ifdef CONFIG_OMAP_MUX
1086
1087 static void omap_mux_init_package(struct omap_mux *superset,
1088                                   struct omap_mux *package_subset,
1089                                   struct omap_ball *package_balls)
1090 {
1091         if (package_subset)
1092                 omap_mux_package_fixup(package_subset, superset);
1093         if (package_balls)
1094                 omap_mux_package_init_balls(package_balls, superset);
1095 }
1096
1097 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1098                                          struct omap_board_mux *board_mux)
1099 {
1100         omap_mux_set_cmdline_signals();
1101         omap_mux_write_array(partition, board_mux);
1102 }
1103
1104 #else
1105
1106 static void omap_mux_init_package(struct omap_mux *superset,
1107                                   struct omap_mux *package_subset,
1108                                   struct omap_ball *package_balls)
1109 {
1110 }
1111
1112 static void __init omap_mux_init_signals(struct omap_mux_partition *partition,
1113                                          struct omap_board_mux *board_mux)
1114 {
1115 }
1116
1117 #endif
1118
1119 static u32 mux_partitions_cnt;
1120
1121 int __init omap_mux_init(const char *name, u32 flags,
1122                          u32 mux_pbase, u32 mux_size,
1123                          struct omap_mux *superset,
1124                          struct omap_mux *package_subset,
1125                          struct omap_board_mux *board_mux,
1126                          struct omap_ball *package_balls)
1127 {
1128         struct omap_mux_partition *partition;
1129
1130         partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1131         if (!partition)
1132                 return -ENOMEM;
1133
1134         partition->name = name;
1135         partition->flags = flags;
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