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
  36 #include <asm/system.h>
  37
  38 #include <plat/omap_hwmod.h>
  39
  40 #include "control.h"
  41 #include "mux.h"
  42
  43 #define OMAP_MUX_BASE_OFFSET            0x30    /* Offset from CTRL_BASE */
  44 #define OMAP_MUX_BASE_SZ                0x5ca
  45
  46 struct omap_mux_entry {
  47         struct omap_mux         mux;
  48         struct list_head        node;
  49 };
  50
  51 static LIST_HEAD(mux_partitions);
  52 static DEFINE_MUTEX(muxmode_mutex);
  53
  54 struct omap_mux_partition *omap_mux_get(const char *name)
  55 {
  56         struct omap_mux_partition *partition;
  57
  58         list_for_each_entry(partition, &mux_partitions, node) {
  59                 if (!strcmp(name, partition->name))
  60                         return partition;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
  67 {
  68         if (partition->flags & OMAP_MUX_REG_8BIT)
  69                 return __raw_readb(partition->base + reg);
  70         else
  71                 return __raw_readw(partition->base + reg);
  72 }
  73
  74 void omap_mux_write(struct omap_mux_partition *partition, u16 val,
  75                            u16 reg)
  76 {
  77         if (partition->flags & OMAP_MUX_REG_8BIT)
  78                 __raw_writeb(val, partition->base + reg);
  79         else
  80                 __raw_writew(val, partition->base + reg);
  81 }
  82
  83 void omap_mux_write_array(struct omap_mux_partition *partition,
  84                                  struct omap_board_mux *board_mux)
  85 {
  86         while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
  87                 omap_mux_write(partition, board_mux->value,
  88                                board_mux->reg_offset);
  89                 board_mux++;
  90         }
  91 }
  92
  93 #ifdef CONFIG_OMAP_MUX
  94
  95 static char *omap_mux_options;
  96
  97 static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
  98                                       int gpio, int val)
  99 {
 100         struct omap_mux_entry *e;
 101         struct omap_mux *gpio_mux = NULL;
 102         u16 old_mode;
 103         u16 mux_mode;
 104         int found = 0;
 105         struct list_head *muxmodes = &partition->muxmodes;
 106
 107         if (!gpio)
 108                 return -EINVAL;
 109
 110         list_for_each_entry(e, muxmodes, node) {
 111                 struct omap_mux *m = &e->mux;
 112                 if (gpio == m->gpio) {
 113                         gpio_mux = m;
 114                         found++;
 115                 }
 116         }
 117
 118         if (found == 0) {
 119                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
 120                 return -ENODEV;
 121         }
 122
 123         if (found > 1) {
 124                 pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
 125                         found, gpio);
 126                 return -EINVAL;
 127         }
 128
 129         old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
 130         mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
 131         if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
 132                 mux_mode |= OMAP_MUX_MODE3;
 133         else
 134                 mux_mode |= OMAP_MUX_MODE4;
 135         pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
 136                  gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
 137         omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
 138
 139         return 0;
 140 }
 141
 142 int __init omap_mux_init_gpio(int gpio, int val)
 143 {
 144         struct omap_mux_partition *partition;
 145         int ret;
 146
 147         list_for_each_entry(partition, &mux_partitions, node) {
 148                 ret = _omap_mux_init_gpio(partition, gpio, val);
 149                 if (!ret)
 150                         return ret;
 151         }
 152
 153         return -ENODEV;
 154 }
 155
 156 static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
 157                                         const char *muxname,
 158                                         struct omap_mux **found_mux)
 159 {
 160         struct omap_mux *mux = NULL;
 161         struct omap_mux_entry *e;
 162         const char *mode_name;
 163         int found = 0, found_mode, mode0_len = 0;
 164         struct list_head *muxmodes = &partition->muxmodes;
 165
 166         mode_name = strchr(muxname, '.');
 167         if (mode_name) {
 168                 mode0_len = strlen(muxname) - strlen(mode_name);
 169                 mode_name++;
 170         } else {
 171                 mode_name = muxname;
 172         }
 173
 174         list_for_each_entry(e, muxmodes, node) {
 175                 char *m0_entry;
 176                 int i;
 177
 178                 mux = &e->mux;
 179                 m0_entry = mux->muxnames[0];
 180
 181                 /* First check for full name in mode0.muxmode format */
 182                 if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
 183                         continue;
 184
 185                 /* Then check for muxmode only */
 186                 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 187                         char *mode_cur = mux->muxnames[i];
 188
 189                         if (!mode_cur)
 190                                 continue;
 191
 192                         if (!strcmp(mode_name, mode_cur)) {
 193                                 *found_mux = mux;
 194                                 found++;
 195                                 found_mode = i;
 196                         }
 197                 }
 198         }
 199
 200         if (found == 1) {
 201                 return found_mode;
 202         }
 203
 204         if (found > 1) {
 205                 pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
 206                        found, muxname);
 207                 return -EINVAL;
 208         }
 209
 210         pr_err("%s: Could not find signal %s\n", __func__, muxname);
 211
 212         return -ENODEV;
 213 }
 214
 215 static int __init
 216 omap_mux_get_by_name(const char *muxname,
 217                         struct omap_mux_partition **found_partition,
 218                         struct omap_mux **found_mux)
 219 {
 220         struct omap_mux_partition *partition;
 221
 222         list_for_each_entry(partition, &mux_partitions, node) {
 223                 struct omap_mux *mux = NULL;
 224                 int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
 225                 if (mux_mode < 0)
 226                         continue;
 227
 228                 *found_partition = partition;
 229                 *found_mux = mux;
 230
 231                 return mux_mode;
 232         }
 233
 234         return -ENODEV;
 235 }
 236
 237 int __init omap_mux_init_signal(const char *muxname, int val)
 238 {
 239         struct omap_mux_partition *partition = NULL;
 240         struct omap_mux *mux = NULL;
 241         u16 old_mode;
 242         int mux_mode;
 243
 244         mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
 245         if (mux_mode < 0)
 246                 return mux_mode;
 247
 248         old_mode = omap_mux_read(partition, mux->reg_offset);
 249         mux_mode |= val;
 250         pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
 251                          __func__, muxname, old_mode, mux_mode);
 252         omap_mux_write(partition, mux_mode, mux->reg_offset);
 253
 254         return 0;
 255 }
 256
 257 struct omap_hwmod_mux_info * __init
 258 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
 259 {
 260         struct omap_hwmod_mux_info *hmux;
 261         int i;
 262
 263         if (!bpads || nr_pads < 1)
 264                 return NULL;
 265
 266         hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
 267         if (!hmux)
 268                 goto err1;
 269
 270         hmux->nr_pads = nr_pads;
 271
 272         hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
 273                                 nr_pads, GFP_KERNEL);
 274         if (!hmux->pads)
 275                 goto err2;
 276
 277         for (i = 0; i < hmux->nr_pads; i++) {
 278                 struct omap_mux_partition *partition;
 279                 struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
 280                 struct omap_mux *mux;
 281                 int mux_mode;
 282
 283                 mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
 284                 if (mux_mode < 0)
 285                         goto err3;
 286                 if (!pad->partition)
 287                         pad->partition = partition;
 288                 if (!pad->mux)
 289                         pad->mux = mux;
 290
 291                 pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
 292                 if (!pad->name) {
 293                         int j;
 294
 295                         for (j = i - 1; j >= 0; j--)
 296                                 kfree(hmux->pads[j].name);
 297                         goto err3;
 298                 }
 299                 strcpy(pad->name, bpad->name);
 300
 301                 pad->flags = bpad->flags;
 302                 pad->enable = bpad->enable;
 303                 pad->idle = bpad->idle;
 304                 pad->off = bpad->off;
 305                 pr_debug("%s: Initialized %s\n", __func__, pad->name);
 306         }
 307
 308         return hmux;
 309
 310 err3:
 311         kfree(hmux->pads);
 312 err2:
 313         kfree(hmux);
 314 err1:
 315         pr_err("%s: Could not allocate device mux entry\n", __func__);
 316
 317         return NULL;
 318 }
 319
 320 /* Assumes the calling function takes care of locking */
 321 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 322 {
 323         int i;
 324
 325         for (i = 0; i < hmux->nr_pads; i++) {
 326                 struct omap_device_pad *pad = &hmux->pads[i];
 327                 int flags, val = -EINVAL;
 328
 329                 flags = pad->flags;
 330
 331                 switch (state) {
 332                 case _HWMOD_STATE_ENABLED:
 333                         if (flags & OMAP_DEVICE_PAD_ENABLED)
 334                                 break;
 335                         flags |= OMAP_DEVICE_PAD_ENABLED;
 336                         val = pad->enable;
 337                         pr_debug("%s: Enabling %s %x\n", __func__,
 338                                         pad->name, val);
 339                         break;
 340                 case _HWMOD_STATE_IDLE:
 341                         if (!(flags & OMAP_DEVICE_PAD_REMUX))
 342                                 break;
 343                         flags &= ~OMAP_DEVICE_PAD_ENABLED;
 344                         val = pad->idle;
 345                         pr_debug("%s: Idling %s %x\n", __func__,
 346                                         pad->name, val);
 347                         break;
 348                 case _HWMOD_STATE_DISABLED:
 349                 default:
 350                         /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
 351                         if (flags & OMAP_DEVICE_PAD_REMUX)
 352                                 val = pad->off;
 353                         else
 354                                 val = OMAP_MUX_MODE7;
 355                         flags &= ~OMAP_DEVICE_PAD_ENABLED;
 356                         pr_debug("%s: Disabling %s %x\n", __func__,
 357                                         pad->name, val);
 358                 };
 359
 360                 if (val >= 0) {
 361                         omap_mux_write(pad->partition, val,
 362                                         pad->mux->reg_offset);
 363                         pad->flags = flags;
 364                 }
 365         }
 366 }
 367
 368 #ifdef CONFIG_DEBUG_FS
 369
 370 #define OMAP_MUX_MAX_NR_FLAGS   10
 371 #define OMAP_MUX_TEST_FLAG(val, mask)                           \
 372         if (((val) & (mask)) == (mask)) {                       \
 373                 i++;                                            \
 374                 flags[i] =  #mask;                              \
 375         }
 376
 377 /* REVISIT: Add checking for non-optimal mux settings */
 378 static inline void omap_mux_decode(struct seq_file *s, u16 val)
 379 {
 380         char *flags[OMAP_MUX_MAX_NR_FLAGS];
 381         char mode[sizeof("OMAP_MUX_MODE") + 1];
 382         int i = -1;
 383
 384         sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
 385         i++;
 386         flags[i] = mode;
 387
 388         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
 389         if (val & OMAP_OFF_EN) {
 390                 if (!(val & OMAP_OFFOUT_EN)) {
 391                         if (!(val & OMAP_OFF_PULL_UP)) {
 392                                 OMAP_MUX_TEST_FLAG(val,
 393                                         OMAP_PIN_OFF_INPUT_PULLDOWN);
 394                         } else {
 395                                 OMAP_MUX_TEST_FLAG(val,
 396                                         OMAP_PIN_OFF_INPUT_PULLUP);
 397                         }
 398                 } else {
 399                         if (!(val & OMAP_OFFOUT_VAL)) {
 400                                 OMAP_MUX_TEST_FLAG(val,
 401                                         OMAP_PIN_OFF_OUTPUT_LOW);
 402                         } else {
 403                                 OMAP_MUX_TEST_FLAG(val,
 404                                         OMAP_PIN_OFF_OUTPUT_HIGH);
 405                         }
 406                 }
 407         }
 408
 409         if (val & OMAP_INPUT_EN) {
 410                 if (val & OMAP_PULL_ENA) {
 411                         if (!(val & OMAP_PULL_UP)) {
 412                                 OMAP_MUX_TEST_FLAG(val,
 413                                         OMAP_PIN_INPUT_PULLDOWN);
 414                         } else {
 415                                 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
 416                         }
 417                 } else {
 418                         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
 419                 }
 420         } else {
 421                 i++;
 422                 flags[i] = "OMAP_PIN_OUTPUT";
 423         }
 424
 425         do {
 426                 seq_printf(s, "%s", flags[i]);
 427                 if (i > 0)
 428                         seq_printf(s, " | ");
 429         } while (i-- > 0);
 430 }
 431
 432 #define OMAP_MUX_DEFNAME_LEN    32
 433
 434 static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
 435 {
 436         struct omap_mux_partition *partition = s->private;
 437         struct omap_mux_entry *e;
 438         u8 omap_gen = omap_rev() >> 28;
 439
 440         list_for_each_entry(e, &partition->muxmodes, node) {
 441                 struct omap_mux *m = &e->mux;
 442                 char m0_def[OMAP_MUX_DEFNAME_LEN];
 443                 char *m0_name = m->muxnames[0];
 444                 u16 val;
 445                 int i, mode;
 446
 447                 if (!m0_name)
 448                         continue;
 449
 450                 /* REVISIT: Needs to be updated if mode0 names get longer */
 451                 for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
 452                         if (m0_name[i] == '\0') {
 453                                 m0_def[i] = m0_name[i];
 454                                 break;
 455                         }
 456                         m0_def[i] = toupper(m0_name[i]);
 457                 }
 458                 val = omap_mux_read(partition, m->reg_offset);
 459                 mode = val & OMAP_MUX_MODE7;
 460                 if (mode != 0)
 461                         seq_printf(s, "/* %s */\n", m->muxnames[mode]);
 462
 463                 /*
 464                  * XXX: Might be revisited to support differences accross
 465                  * same OMAP generation.
 466                  */
 467                 seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
 468                 omap_mux_decode(s, val);
 469                 seq_printf(s, "),\n");
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
 476 {
 477         return single_open(file, omap_mux_dbg_board_show, inode->i_private);
 478 }
 479
 480 static const struct file_operations omap_mux_dbg_board_fops = {
 481         .open           = omap_mux_dbg_board_open,
 482         .read           = seq_read,
 483         .llseek         = seq_lseek,
 484         .release        = single_release,
 485 };
 486
 487 static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
 488 {
 489         struct omap_mux_partition *partition;
 490
 491         list_for_each_entry(partition, &mux_partitions, node) {
 492                 struct list_head *muxmodes = &partition->muxmodes;
 493                 struct omap_mux_entry *e;
 494
 495                 list_for_each_entry(e, muxmodes, node) {
 496                         struct omap_mux *m = &e->mux;
 497
 498                         if (m == mux)
 499                                 return partition;
 500                 }
 501         }
 502
 503         return NULL;
 504 }
 505
 506 static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
 507 {
 508         struct omap_mux *m = s->private;
 509         struct omap_mux_partition *partition;
 510         const char *none = "NA";
 511         u16 val;
 512         int mode;
 513
 514         partition = omap_mux_get_partition(m);
 515         if (!partition)
 516                 return 0;
 517
 518         val = omap_mux_read(partition, m->reg_offset);
 519         mode = val & OMAP_MUX_MODE7;
 520
 521         seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
 522                         m->muxnames[0], m->muxnames[mode],
 523                         partition->phys + m->reg_offset, m->reg_offset, val,
 524                         m->balls[0] ? m->balls[0] : none,
 525                         m->balls[1] ? m->balls[1] : none);
 526         seq_printf(s, "mode: ");
 527         omap_mux_decode(s, val);
 528         seq_printf(s, "\n");
 529         seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
 530                         m->muxnames[0] ? m->muxnames[0] : none,
 531                         m->muxnames[1] ? m->muxnames[1] : none,
 532                         m->muxnames[2] ? m->muxnames[2] : none,
 533                         m->muxnames[3] ? m->muxnames[3] : none,
 534                         m->muxnames[4] ? m->muxnames[4] : none,
 535                         m->muxnames[5] ? m->muxnames[5] : none,
 536                         m->muxnames[6] ? m->muxnames[6] : none,
 537                         m->muxnames[7] ? m->muxnames[7] : none);
 538
 539         return 0;
 540 }
 541
 542 #define OMAP_MUX_MAX_ARG_CHAR  7
 543
 544 static ssize_t omap_mux_dbg_signal_write(struct file *file,
 545                                          const char __user *user_buf,
 546                                          size_t count, loff_t *ppos)
 547 {
 548         char buf[OMAP_MUX_MAX_ARG_CHAR];
 549         struct seq_file *seqf;
 550         struct omap_mux *m;
 551         unsigned long val;
 552         int buf_size, ret;
 553         struct omap_mux_partition *partition;
 554
 555         if (count > OMAP_MUX_MAX_ARG_CHAR)
 556                 return -EINVAL;
 557
 558         memset(buf, 0, sizeof(buf));
 559         buf_size = min(count, sizeof(buf) - 1);
 560
 561         if (copy_from_user(buf, user_buf, buf_size))
 562                 return -EFAULT;
 563
 564         ret = strict_strtoul(buf, 0x10, &val);
 565         if (ret < 0)
 566                 return ret;
 567
 568         if (val > 0xffff)
 569                 return -EINVAL;
 570
 571         seqf = file->private_data;
 572         m = seqf->private;
 573
 574         partition = omap_mux_get_partition(m);
 575         if (!partition)
 576                 return -ENODEV;
 577
 578         omap_mux_write(partition, (u16)val, m->reg_offset);
 579         *ppos += count;
 580
 581         return count;
 582 }
 583
 584 static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
 585 {
 586         return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
 587 }
 588
 589 static const struct file_operations omap_mux_dbg_signal_fops = {
 590         .open           = omap_mux_dbg_signal_open,
 591         .read           = seq_read,
 592         .write          = omap_mux_dbg_signal_write,
 593         .llseek         = seq_lseek,
 594         .release        = single_release,
 595 };
 596
 597 static struct dentry *mux_dbg_dir;
 598
 599 static void __init omap_mux_dbg_create_entry(
 600                                 struct omap_mux_partition *partition,
 601                                 struct dentry *mux_dbg_dir)
 602 {
 603         struct omap_mux_entry *e;
 604
 605         list_for_each_entry(e, &partition->muxmodes, node) {
 606                 struct omap_mux *m = &e->mux;
 607
 608                 (void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
 609                                           m, &omap_mux_dbg_signal_fops);
 610         }
 611 }
 612
 613 static void __init omap_mux_dbg_init(void)
 614 {
 615         struct omap_mux_partition *partition;
 616         static struct dentry *mux_dbg_board_dir;
 617
 618         mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
 619         if (!mux_dbg_dir)
 620                 return;
 621
 622         mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
 623         if (!mux_dbg_board_dir)
 624                 return;
 625
 626         list_for_each_entry(partition, &mux_partitions, node) {
 627                 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
 628                 (void)debugfs_create_file(partition->name, S_IRUGO,
 629                                           mux_dbg_board_dir, partition,
 630                                           &omap_mux_dbg_board_fops);
 631         }
 632 }
 633
 634 #else
 635 static inline void omap_mux_dbg_init(void)
 636 {
 637 }
 638 #endif  /* CONFIG_DEBUG_FS */
 639
 640 static void __init omap_mux_free_names(struct omap_mux *m)
 641 {
 642         int i;
 643
 644         for (i = 0; i < OMAP_MUX_NR_MODES; i++)
 645                 kfree(m->muxnames[i]);
 646
 647 #ifdef CONFIG_DEBUG_FS
 648         for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
 649                 kfree(m->balls[i]);
 650 #endif
 651
 652 }
 653
 654 /* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
 655 static int __init omap_mux_late_init(void)
 656 {
 657         struct omap_mux_partition *partition;
 658
 659         list_for_each_entry(partition, &mux_partitions, node) {
 660                 struct omap_mux_entry *e, *tmp;
 661                 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
 662                         struct omap_mux *m = &e->mux;
 663                         u16 mode = omap_mux_read(partition, m->reg_offset);
 664
 665                         if (OMAP_MODE_GPIO(mode))
 666                                 continue;
 667
 668 #ifndef CONFIG_DEBUG_FS
 669                         mutex_lock(&muxmode_mutex);
 670                         list_del(&e->node);
 671                         mutex_unlock(&muxmode_mutex);
 672                         omap_mux_free_names(m);
 673                         kfree(m);
 674 #endif
 675                 }
 676         }
 677
 678         omap_mux_dbg_init();
 679
 680         return 0;
 681 }
 682 late_initcall(omap_mux_late_init);
 683
 684 static void __init omap_mux_package_fixup(struct omap_mux *p,
 685                                         struct omap_mux *superset)
 686 {
 687         while (p->reg_offset !=  OMAP_MUX_TERMINATOR) {
 688                 struct omap_mux *s = superset;
 689                 int found = 0;
 690
 691                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 692                         if (s->reg_offset == p->reg_offset) {
 693                                 *s = *p;
 694                                 found++;
 695                                 break;
 696                         }
 697                         s++;
 698                 }
 699                 if (!found)
 700                         pr_err("%s: Unknown entry offset 0x%x\n", __func__,
 701                                p->reg_offset);
 702                 p++;
 703         }
 704 }
 705
 706 #ifdef CONFIG_DEBUG_FS
 707
 708 static void __init omap_mux_package_init_balls(struct omap_ball *b,
 709                                 struct omap_mux *superset)
 710 {
 711         while (b->reg_offset != OMAP_MUX_TERMINATOR) {
 712                 struct omap_mux *s = superset;
 713                 int found = 0;
 714
 715                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 716                         if (s->reg_offset == b->reg_offset) {
 717                                 s->balls[0] = b->balls[0];
 718                                 s->balls[1] = b->balls[1];
 719                                 found++;
 720                                 break;
 721                         }
 722                         s++;
 723                 }
 724                 if (!found)
 725                         pr_err("%s: Unknown ball offset 0x%x\n", __func__,
 726                                b->reg_offset);
 727                 b++;
 728         }
 729 }
 730
 731 #else   /* CONFIG_DEBUG_FS */
 732
 733 static inline void omap_mux_package_init_balls(struct omap_ball *b,
 734                                         struct omap_mux *superset)
 735 {
 736 }
 737
 738 #endif  /* CONFIG_DEBUG_FS */
 739
 740 static int __init omap_mux_setup(char *options)
 741 {
 742         if (!options)
 743                 return 0;
 744
 745         omap_mux_options = options;
 746
 747         return 1;
 748 }
 749 __setup("omap_mux=", omap_mux_setup);
 750
 751 /*
 752  * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
 753  * cmdline options only override the bootloader values.
 754  * During development, please enable CONFIG_DEBUG_FS, and use the
 755  * signal specific entries under debugfs.
 756  */
 757 static void __init omap_mux_set_cmdline_signals(void)
 758 {
 759         char *options, *next_opt, *token;
 760
 761         if (!omap_mux_options)
 762                 return;
 763
 764         options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
 765         if (!options)
 766                 return;
 767
 768         strcpy(options, omap_mux_options);
 769         next_opt = options;
 770
 771         while ((token = strsep(&next_opt, ",")) != NULL) {
 772                 char *keyval, *name;
 773                 unsigned long val;
 774
 775                 keyval = token;
 776                 name = strsep(&keyval, "=");
 777                 if (name) {
 778                         int res;
 779
 780                         res = strict_strtoul(keyval, 0x10, &val);
 781                         if (res < 0)
 782                                 continue;
 783
 784                         omap_mux_init_signal(name, (u16)val);
 785                 }
 786         }
 787
 788         kfree(options);
 789 }
 790
 791 static int __init omap_mux_copy_names(struct omap_mux *src,
 792                                       struct omap_mux *dst)
 793 {
 794         int i;
 795
 796         for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 797                 if (src->muxnames[i]) {
 798                         dst->muxnames[i] =
 799                                 kmalloc(strlen(src->muxnames[i]) + 1,
 800                                         GFP_KERNEL);
 801                         if (!dst->muxnames[i])
 802                                 goto free;
 803                         strcpy(dst->muxnames[i], src->muxnames[i]);
 804                 }
 805         }
 806
 807 #ifdef CONFIG_DEBUG_FS
 808         for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
 809                 if (src->balls[i]) {
 810                         dst->balls[i] =
 811                                 kmalloc(strlen(src->balls[i]) + 1,
 812                                         GFP_KERNEL);
 813                         if (!dst->balls[i])
 814                                 goto free;
 815                         strcpy(dst->balls[i], src->balls[i]);
 816                 }
 817         }
 818 #endif
 819
 820         return 0;
 821
 822 free:
 823         omap_mux_free_names(dst);
 824         return -ENOMEM;
 825
 826 }
 827
 828 #endif  /* CONFIG_OMAP_MUX */
 829
 830 static struct omap_mux *omap_mux_get_by_gpio(
 831                                 struct omap_mux_partition *partition,
 832                                 int gpio)
 833 {
 834         struct omap_mux_entry *e;
 835         struct omap_mux *ret = NULL;
 836
 837         list_for_each_entry(e, &partition->muxmodes, node) {
 838                 struct omap_mux *m = &e->mux;
 839                 if (m->gpio == gpio) {
 840                         ret = m;
 841                         break;
 842                 }
 843         }
 844
 845         return ret;
 846 }
 847
 848 /* Needed for dynamic muxing of GPIO pins for off-idle */
 849 u16 omap_mux_get_gpio(int gpio)
 850 {
 851         struct omap_mux_partition *partition;
 852         struct omap_mux *m;
 853
 854         list_for_each_entry(partition, &mux_partitions, node) {
 855                 m = omap_mux_get_by_gpio(partition, gpio);
 856                 if (m)
 857                         return omap_mux_read(partition, m->reg_offset);
 858         }
 859
 860         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 861                 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
 862
 863         return OMAP_MUX_TERMINATOR;
 864 }
 865
 866 /* Needed for dynamic muxing of GPIO pins for off-idle */
 867 void omap_mux_set_gpio(u16 val, int gpio)
 868 {
 869         struct omap_mux_partition *partition;
 870         struct omap_mux *m = NULL;
 871
 872         list_for_each_entry(partition, &mux_partitions, node) {
 873                 m = omap_mux_get_by_gpio(partition, gpio);
 874                 if (m) {
 875                         omap_mux_write(partition, val, m->reg_offset);
 876                         return;
 877                 }
 878         }
 879
 880         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 881                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
 882 }
 883
 884 static struct omap_mux * __init omap_mux_list_add(
 885                                         struct omap_mux_partition *partition,
 886                                         struct omap_mux *src)
 887 {
 888         struct omap_mux_entry *entry;
 889         struct omap_mux *m;
 890
 891         entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
 892         if (!entry)
 893                 return NULL;
 894
 895         m = &entry->mux;
 896         memcpy(m, src, sizeof(struct omap_mux_entry));
 897
 898 #ifdef CONFIG_OMAP_MUX
 899         if (omap_mux_copy_names(src, m)) {
 900                 kfree(entry);
 901                 return NULL;
 902         }
 903 #endif
 904
 905         mutex_lock(&muxmode_mutex);
 906         list_add_tail(&entry->node, &partition->muxmodes);
 907         mutex_unlock(&muxmode_mutex);
 908
 909         return m;
 910 }
 911
 912 /*
 913  * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
 914  * the GPIO to mux offset mapping that is needed for dynamic muxing
 915  * of GPIO pins for off-idle.
 916  */
 917 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
 918                                       struct omap_mux *superset)
 919 {
 920         while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
 921                 struct omap_mux *entry;
 922
 923 #ifdef CONFIG_OMAP_MUX
 924                 if (!superset->muxnames || !superset->muxnames[0]) {
 925                         superset++;
 926                         continue;
 927                 }
 928 #else
 929                 /* Skip pins that are not muxed as GPIO by bootloader */
 930                 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
 931                                     superset->reg_offset))) {
 932                         superset++;
 933                         continue;
 934                 }
 935 #endif
 936
 937                 entry = omap_mux_list_add(partition, superset);
 938                 if (!entry) {
 939                         pr_err("%s: Could not add entry\n", __func__);
 940                         return;
 941                 }
 942                 superset++;
 943         }
 944 }
 945
 946 #ifdef CONFIG_OMAP_MUX
 947
 948 static void omap_mux_init_package(struct omap_mux *superset,
 949                                   struct omap_mux *package_subset,
 950                                   struct omap_ball *package_balls)
 951 {
 952         if (package_subset)
 953                 omap_mux_package_fixup(package_subset, superset);
 954         if (package_balls)
 955                 omap_mux_package_init_balls(package_balls, superset);
 956 }
 957
 958 static void omap_mux_init_signals(struct omap_mux_partition *partition,
 959                                   struct omap_board_mux *board_mux)
 960 {
 961         omap_mux_set_cmdline_signals();
 962         omap_mux_write_array(partition, board_mux);
 963 }
 964
 965 #else
 966
 967 static void omap_mux_init_package(struct omap_mux *superset,
 968                                   struct omap_mux *package_subset,
 969                                   struct omap_ball *package_balls)
 970 {
 971 }
 972
 973 static void omap_mux_init_signals(struct omap_mux_partition *partition,
 974                                   struct omap_board_mux *board_mux)
 975 {
 976 }
 977
 978 #endif
 979
 980 static u32 mux_partitions_cnt;
 981
 982 int __init omap_mux_init(const char *name, u32 flags,
 983                          u32 mux_pbase, u32 mux_size,
 984                          struct omap_mux *superset,
 985                          struct omap_mux *package_subset,
 986                          struct omap_board_mux *board_mux,
 987                          struct omap_ball *package_balls)
 988 {
 989         struct omap_mux_partition *partition;
 990
 991         partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
 992         if (!partition)
 993                 return -ENOMEM;
 994
 995         partition->name = name;
 996         partition->flags = flags;
 997         partition->size = mux_size;
 998         partition->phys = mux_pbase;
 999         partition->base = ioremap(mux_pbase, mux_size);
1000         if (!partition->base) {
1001                 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1002                         __func__, partition->phys);
1003                 return -ENODEV;
1004         }
1005
1006         INIT_LIST_HEAD(&partition->muxmodes);
1007
1008         list_add_tail(&partition->node, &mux_partitions);
1009         mux_partitions_cnt++;
1010         pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1011                 mux_partitions_cnt, partition->name, partition->flags);
1012
1013         omap_mux_init_package(superset, package_subset, package_balls);
1014         omap_mux_init_list(partition, superset);
1015         omap_mux_init_signals(partition, board_mux);
1016
1017         return 0;
1018 }
1019