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 = 0, 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, nr_pads_dynamic = 0;
 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
 306                 if (pad->flags & OMAP_DEVICE_PAD_REMUX)
 307                         nr_pads_dynamic++;
 308
 309                 pr_debug("%s: Initialized %s\n", __func__, pad->name);
 310         }
 311
 312         if (!nr_pads_dynamic)
 313                 return hmux;
 314
 315         /*
 316          * Add pads that need dynamic muxing into a separate list
 317          */
 318
 319         hmux->nr_pads_dynamic = nr_pads_dynamic;
 320         hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
 321                                         nr_pads_dynamic, GFP_KERNEL);
 322         if (!hmux->pads_dynamic) {
 323                 pr_err("%s: Could not allocate dynamic pads\n", __func__);
 324                 return hmux;
 325         }
 326
 327         nr_pads_dynamic = 0;
 328         for (i = 0; i < hmux->nr_pads; i++) {
 329                 struct omap_device_pad *pad = &hmux->pads[i];
 330
 331                 if (pad->flags & OMAP_DEVICE_PAD_REMUX) {
 332                         pr_debug("%s: pad %s tagged dynamic\n",
 333                                         __func__, pad->name);
 334                         hmux->pads_dynamic[nr_pads_dynamic] = pad;
 335                         nr_pads_dynamic++;
 336                 }
 337         }
 338
 339         return hmux;
 340
 341 err3:
 342         kfree(hmux->pads);
 343 err2:
 344         kfree(hmux);
 345 err1:
 346         pr_err("%s: Could not allocate device mux entry\n", __func__);
 347
 348         return NULL;
 349 }
 350
 351 /* Assumes the calling function takes care of locking */
 352 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 353 {
 354         int i;
 355
 356         /* Runtime idling of dynamic pads */
 357         if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
 358                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 359                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 360                         int val = -EINVAL;
 361
 362                         pad->flags |= OMAP_DEVICE_PAD_IDLE;
 363                         val = pad->idle;
 364                         omap_mux_write(pad->partition, val,
 365                                         pad->mux->reg_offset);
 366                 }
 367
 368                 return;
 369         }
 370
 371         /* Runtime enabling of dynamic pads */
 372         if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic) {
 373                 int idled = 0;
 374
 375                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 376                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 377                         int val = -EINVAL;
 378
 379                         if (!(pad->flags & OMAP_DEVICE_PAD_IDLE))
 380                                 continue;
 381
 382                         pad->flags &= ~OMAP_DEVICE_PAD_IDLE;
 383                         val = pad->enable;
 384                         omap_mux_write(pad->partition, val,
 385                                         pad->mux->reg_offset);
 386                         idled++;
 387                 }
 388
 389                 if (idled)
 390                         return;
 391         }
 392
 393         /* Enabling or disabling of all pads */
 394         for (i = 0; i < hmux->nr_pads; i++) {
 395                 struct omap_device_pad *pad = &hmux->pads[i];
 396                 int flags, val = -EINVAL;
 397
 398                 flags = pad->flags;
 399
 400                 switch (state) {
 401                 case _HWMOD_STATE_ENABLED:
 402                         val = pad->enable;
 403                         pr_debug("%s: Enabling %s %x\n", __func__,
 404                                         pad->name, val);
 405                         break;
 406                 case _HWMOD_STATE_DISABLED:
 407                 default:
 408                         /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
 409                         if (flags & OMAP_DEVICE_PAD_REMUX)
 410                                 val = pad->off;
 411                         else
 412                                 val = OMAP_MUX_MODE7;
 413                         pr_debug("%s: Disabling %s %x\n", __func__,
 414                                         pad->name, val);
 415                 };
 416
 417                 if (val >= 0) {
 418                         omap_mux_write(pad->partition, val,
 419                                         pad->mux->reg_offset);
 420                         pad->flags = flags;
 421                 }
 422         }
 423
 424         if (state == _HWMOD_STATE_ENABLED)
 425                 hmux->enabled = true;
 426         else
 427                 hmux->enabled = false;
 428 }
 429
 430 #ifdef CONFIG_DEBUG_FS
 431
 432 #define OMAP_MUX_MAX_NR_FLAGS   10
 433 #define OMAP_MUX_TEST_FLAG(val, mask)                           \
 434         if (((val) & (mask)) == (mask)) {                       \
 435                 i++;                                            \
 436                 flags[i] =  #mask;                              \
 437         }
 438
 439 /* REVISIT: Add checking for non-optimal mux settings */
 440 static inline void omap_mux_decode(struct seq_file *s, u16 val)
 441 {
 442         char *flags[OMAP_MUX_MAX_NR_FLAGS];
 443         char mode[sizeof("OMAP_MUX_MODE") + 1];
 444         int i = -1;
 445
 446         sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
 447         i++;
 448         flags[i] = mode;
 449
 450         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
 451         if (val & OMAP_OFF_EN) {
 452                 if (!(val & OMAP_OFFOUT_EN)) {
 453                         if (!(val & OMAP_OFF_PULL_UP)) {
 454                                 OMAP_MUX_TEST_FLAG(val,
 455                                         OMAP_PIN_OFF_INPUT_PULLDOWN);
 456                         } else {
 457                                 OMAP_MUX_TEST_FLAG(val,
 458                                         OMAP_PIN_OFF_INPUT_PULLUP);
 459                         }
 460                 } else {
 461                         if (!(val & OMAP_OFFOUT_VAL)) {
 462                                 OMAP_MUX_TEST_FLAG(val,
 463                                         OMAP_PIN_OFF_OUTPUT_LOW);
 464                         } else {
 465                                 OMAP_MUX_TEST_FLAG(val,
 466                                         OMAP_PIN_OFF_OUTPUT_HIGH);
 467                         }
 468                 }
 469         }
 470
 471         if (val & OMAP_INPUT_EN) {
 472                 if (val & OMAP_PULL_ENA) {
 473                         if (!(val & OMAP_PULL_UP)) {
 474                                 OMAP_MUX_TEST_FLAG(val,
 475                                         OMAP_PIN_INPUT_PULLDOWN);
 476                         } else {
 477                                 OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
 478                         }
 479                 } else {
 480                         OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
 481                 }
 482         } else {
 483                 i++;
 484                 flags[i] = "OMAP_PIN_OUTPUT";
 485         }
 486
 487         do {
 488                 seq_printf(s, "%s", flags[i]);
 489                 if (i > 0)
 490                         seq_printf(s, " | ");
 491         } while (i-- > 0);
 492 }
 493
 494 #define OMAP_MUX_DEFNAME_LEN    32
 495
 496 static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
 497 {
 498         struct omap_mux_partition *partition = s->private;
 499         struct omap_mux_entry *e;
 500         u8 omap_gen = omap_rev() >> 28;
 501
 502         list_for_each_entry(e, &partition->muxmodes, node) {
 503                 struct omap_mux *m = &e->mux;
 504                 char m0_def[OMAP_MUX_DEFNAME_LEN];
 505                 char *m0_name = m->muxnames[0];
 506                 u16 val;
 507                 int i, mode;
 508
 509                 if (!m0_name)
 510                         continue;
 511
 512                 /* REVISIT: Needs to be updated if mode0 names get longer */
 513                 for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
 514                         if (m0_name[i] == '\0') {
 515                                 m0_def[i] = m0_name[i];
 516                                 break;
 517                         }
 518                         m0_def[i] = toupper(m0_name[i]);
 519                 }
 520                 val = omap_mux_read(partition, m->reg_offset);
 521                 mode = val & OMAP_MUX_MODE7;
 522                 if (mode != 0)
 523                         seq_printf(s, "/* %s */\n", m->muxnames[mode]);
 524
 525                 /*
 526                  * XXX: Might be revisited to support differences accross
 527                  * same OMAP generation.
 528                  */
 529                 seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
 530                 omap_mux_decode(s, val);
 531                 seq_printf(s, "),\n");
 532         }
 533
 534         return 0;
 535 }
 536
 537 static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
 538 {
 539         return single_open(file, omap_mux_dbg_board_show, inode->i_private);
 540 }
 541
 542 static const struct file_operations omap_mux_dbg_board_fops = {
 543         .open           = omap_mux_dbg_board_open,
 544         .read           = seq_read,
 545         .llseek         = seq_lseek,
 546         .release        = single_release,
 547 };
 548
 549 static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
 550 {
 551         struct omap_mux_partition *partition;
 552
 553         list_for_each_entry(partition, &mux_partitions, node) {
 554                 struct list_head *muxmodes = &partition->muxmodes;
 555                 struct omap_mux_entry *e;
 556
 557                 list_for_each_entry(e, muxmodes, node) {
 558                         struct omap_mux *m = &e->mux;
 559
 560                         if (m == mux)
 561                                 return partition;
 562                 }
 563         }
 564
 565         return NULL;
 566 }
 567
 568 static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
 569 {
 570         struct omap_mux *m = s->private;
 571         struct omap_mux_partition *partition;
 572         const char *none = "NA";
 573         u16 val;
 574         int mode;
 575
 576         partition = omap_mux_get_partition(m);
 577         if (!partition)
 578                 return 0;
 579
 580         val = omap_mux_read(partition, m->reg_offset);
 581         mode = val & OMAP_MUX_MODE7;
 582
 583         seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
 584                         m->muxnames[0], m->muxnames[mode],
 585                         partition->phys + m->reg_offset, m->reg_offset, val,
 586                         m->balls[0] ? m->balls[0] : none,
 587                         m->balls[1] ? m->balls[1] : none);
 588         seq_printf(s, "mode: ");
 589         omap_mux_decode(s, val);
 590         seq_printf(s, "\n");
 591         seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
 592                         m->muxnames[0] ? m->muxnames[0] : none,
 593                         m->muxnames[1] ? m->muxnames[1] : none,
 594                         m->muxnames[2] ? m->muxnames[2] : none,
 595                         m->muxnames[3] ? m->muxnames[3] : none,
 596                         m->muxnames[4] ? m->muxnames[4] : none,
 597                         m->muxnames[5] ? m->muxnames[5] : none,
 598                         m->muxnames[6] ? m->muxnames[6] : none,
 599                         m->muxnames[7] ? m->muxnames[7] : none);
 600
 601         return 0;
 602 }
 603
 604 #define OMAP_MUX_MAX_ARG_CHAR  7
 605
 606 static ssize_t omap_mux_dbg_signal_write(struct file *file,
 607                                          const char __user *user_buf,
 608                                          size_t count, loff_t *ppos)
 609 {
 610         char buf[OMAP_MUX_MAX_ARG_CHAR];
 611         struct seq_file *seqf;
 612         struct omap_mux *m;
 613         unsigned long val;
 614         int buf_size, ret;
 615         struct omap_mux_partition *partition;
 616
 617         if (count > OMAP_MUX_MAX_ARG_CHAR)
 618                 return -EINVAL;
 619
 620         memset(buf, 0, sizeof(buf));
 621         buf_size = min(count, sizeof(buf) - 1);
 622
 623         if (copy_from_user(buf, user_buf, buf_size))
 624                 return -EFAULT;
 625
 626         ret = strict_strtoul(buf, 0x10, &val);
 627         if (ret < 0)
 628                 return ret;
 629
 630         if (val > 0xffff)
 631                 return -EINVAL;
 632
 633         seqf = file->private_data;
 634         m = seqf->private;
 635
 636         partition = omap_mux_get_partition(m);
 637         if (!partition)
 638                 return -ENODEV;
 639
 640         omap_mux_write(partition, (u16)val, m->reg_offset);
 641         *ppos += count;
 642
 643         return count;
 644 }
 645
 646 static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
 647 {
 648         return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
 649 }
 650
 651 static const struct file_operations omap_mux_dbg_signal_fops = {
 652         .open           = omap_mux_dbg_signal_open,
 653         .read           = seq_read,
 654         .write          = omap_mux_dbg_signal_write,
 655         .llseek         = seq_lseek,
 656         .release        = single_release,
 657 };
 658
 659 static struct dentry *mux_dbg_dir;
 660
 661 static void __init omap_mux_dbg_create_entry(
 662                                 struct omap_mux_partition *partition,
 663                                 struct dentry *mux_dbg_dir)
 664 {
 665         struct omap_mux_entry *e;
 666
 667         list_for_each_entry(e, &partition->muxmodes, node) {
 668                 struct omap_mux *m = &e->mux;
 669
 670                 (void)debugfs_create_file(m->muxnames[0], S_IWUSR, mux_dbg_dir,
 671                                           m, &omap_mux_dbg_signal_fops);
 672         }
 673 }
 674
 675 static void __init omap_mux_dbg_init(void)
 676 {
 677         struct omap_mux_partition *partition;
 678         static struct dentry *mux_dbg_board_dir;
 679
 680         mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
 681         if (!mux_dbg_dir)
 682                 return;
 683
 684         mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
 685         if (!mux_dbg_board_dir)
 686                 return;
 687
 688         list_for_each_entry(partition, &mux_partitions, node) {
 689                 omap_mux_dbg_create_entry(partition, mux_dbg_dir);
 690                 (void)debugfs_create_file(partition->name, S_IRUGO,
 691                                           mux_dbg_board_dir, partition,
 692                                           &omap_mux_dbg_board_fops);
 693         }
 694 }
 695
 696 #else
 697 static inline void omap_mux_dbg_init(void)
 698 {
 699 }
 700 #endif  /* CONFIG_DEBUG_FS */
 701
 702 static void __init omap_mux_free_names(struct omap_mux *m)
 703 {
 704         int i;
 705
 706         for (i = 0; i < OMAP_MUX_NR_MODES; i++)
 707                 kfree(m->muxnames[i]);
 708
 709 #ifdef CONFIG_DEBUG_FS
 710         for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
 711                 kfree(m->balls[i]);
 712 #endif
 713
 714 }
 715
 716 /* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
 717 static int __init omap_mux_late_init(void)
 718 {
 719         struct omap_mux_partition *partition;
 720
 721         list_for_each_entry(partition, &mux_partitions, node) {
 722                 struct omap_mux_entry *e, *tmp;
 723                 list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
 724                         struct omap_mux *m = &e->mux;
 725                         u16 mode = omap_mux_read(partition, m->reg_offset);
 726
 727                         if (OMAP_MODE_GPIO(mode))
 728                                 continue;
 729
 730 #ifndef CONFIG_DEBUG_FS
 731                         mutex_lock(&muxmode_mutex);
 732                         list_del(&e->node);
 733                         mutex_unlock(&muxmode_mutex);
 734                         omap_mux_free_names(m);
 735                         kfree(m);
 736 #endif
 737                 }
 738         }
 739
 740         omap_mux_dbg_init();
 741
 742         return 0;
 743 }
 744 late_initcall(omap_mux_late_init);
 745
 746 static void __init omap_mux_package_fixup(struct omap_mux *p,
 747                                         struct omap_mux *superset)
 748 {
 749         while (p->reg_offset !=  OMAP_MUX_TERMINATOR) {
 750                 struct omap_mux *s = superset;
 751                 int found = 0;
 752
 753                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 754                         if (s->reg_offset == p->reg_offset) {
 755                                 *s = *p;
 756                                 found++;
 757                                 break;
 758                         }
 759                         s++;
 760                 }
 761                 if (!found)
 762                         pr_err("%s: Unknown entry offset 0x%x\n", __func__,
 763                                p->reg_offset);
 764                 p++;
 765         }
 766 }
 767
 768 #ifdef CONFIG_DEBUG_FS
 769
 770 static void __init omap_mux_package_init_balls(struct omap_ball *b,
 771                                 struct omap_mux *superset)
 772 {
 773         while (b->reg_offset != OMAP_MUX_TERMINATOR) {
 774                 struct omap_mux *s = superset;
 775                 int found = 0;
 776
 777                 while (s->reg_offset != OMAP_MUX_TERMINATOR) {
 778                         if (s->reg_offset == b->reg_offset) {
 779                                 s->balls[0] = b->balls[0];
 780                                 s->balls[1] = b->balls[1];
 781                                 found++;
 782                                 break;
 783                         }
 784                         s++;
 785                 }
 786                 if (!found)
 787                         pr_err("%s: Unknown ball offset 0x%x\n", __func__,
 788                                b->reg_offset);
 789                 b++;
 790         }
 791 }
 792
 793 #else   /* CONFIG_DEBUG_FS */
 794
 795 static inline void omap_mux_package_init_balls(struct omap_ball *b,
 796                                         struct omap_mux *superset)
 797 {
 798 }
 799
 800 #endif  /* CONFIG_DEBUG_FS */
 801
 802 static int __init omap_mux_setup(char *options)
 803 {
 804         if (!options)
 805                 return 0;
 806
 807         omap_mux_options = options;
 808
 809         return 1;
 810 }
 811 __setup("omap_mux=", omap_mux_setup);
 812
 813 /*
 814  * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
 815  * cmdline options only override the bootloader values.
 816  * During development, please enable CONFIG_DEBUG_FS, and use the
 817  * signal specific entries under debugfs.
 818  */
 819 static void __init omap_mux_set_cmdline_signals(void)
 820 {
 821         char *options, *next_opt, *token;
 822
 823         if (!omap_mux_options)
 824                 return;
 825
 826         options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
 827         if (!options)
 828                 return;
 829
 830         strcpy(options, omap_mux_options);
 831         next_opt = options;
 832
 833         while ((token = strsep(&next_opt, ",")) != NULL) {
 834                 char *keyval, *name;
 835                 unsigned long val;
 836
 837                 keyval = token;
 838                 name = strsep(&keyval, "=");
 839                 if (name) {
 840                         int res;
 841
 842                         res = strict_strtoul(keyval, 0x10, &val);
 843                         if (res < 0)
 844                                 continue;
 845
 846                         omap_mux_init_signal(name, (u16)val);
 847                 }
 848         }
 849
 850         kfree(options);
 851 }
 852
 853 static int __init omap_mux_copy_names(struct omap_mux *src,
 854                                       struct omap_mux *dst)
 855 {
 856         int i;
 857
 858         for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 859                 if (src->muxnames[i]) {
 860                         dst->muxnames[i] =
 861                                 kmalloc(strlen(src->muxnames[i]) + 1,
 862                                         GFP_KERNEL);
 863                         if (!dst->muxnames[i])
 864                                 goto free;
 865                         strcpy(dst->muxnames[i], src->muxnames[i]);
 866                 }
 867         }
 868
 869 #ifdef CONFIG_DEBUG_FS
 870         for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
 871                 if (src->balls[i]) {
 872                         dst->balls[i] =
 873                                 kmalloc(strlen(src->balls[i]) + 1,
 874                                         GFP_KERNEL);
 875                         if (!dst->balls[i])
 876                                 goto free;
 877                         strcpy(dst->balls[i], src->balls[i]);
 878                 }
 879         }
 880 #endif
 881
 882         return 0;
 883
 884 free:
 885         omap_mux_free_names(dst);
 886         return -ENOMEM;
 887
 888 }
 889
 890 #endif  /* CONFIG_OMAP_MUX */
 891
 892 static struct omap_mux *omap_mux_get_by_gpio(
 893                                 struct omap_mux_partition *partition,
 894                                 int gpio)
 895 {
 896         struct omap_mux_entry *e;
 897         struct omap_mux *ret = NULL;
 898
 899         list_for_each_entry(e, &partition->muxmodes, node) {
 900                 struct omap_mux *m = &e->mux;
 901                 if (m->gpio == gpio) {
 902                         ret = m;
 903                         break;
 904                 }
 905         }
 906
 907         return ret;
 908 }
 909
 910 /* Needed for dynamic muxing of GPIO pins for off-idle */
 911 u16 omap_mux_get_gpio(int gpio)
 912 {
 913         struct omap_mux_partition *partition;
 914         struct omap_mux *m;
 915
 916         list_for_each_entry(partition, &mux_partitions, node) {
 917                 m = omap_mux_get_by_gpio(partition, gpio);
 918                 if (m)
 919                         return omap_mux_read(partition, m->reg_offset);
 920         }
 921
 922         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 923                 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
 924
 925         return OMAP_MUX_TERMINATOR;
 926 }
 927
 928 /* Needed for dynamic muxing of GPIO pins for off-idle */
 929 void omap_mux_set_gpio(u16 val, int gpio)
 930 {
 931         struct omap_mux_partition *partition;
 932         struct omap_mux *m = NULL;
 933
 934         list_for_each_entry(partition, &mux_partitions, node) {
 935                 m = omap_mux_get_by_gpio(partition, gpio);
 936                 if (m) {
 937                         omap_mux_write(partition, val, m->reg_offset);
 938                         return;
 939                 }
 940         }
 941
 942         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 943                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
 944 }
 945
 946 static struct omap_mux * __init omap_mux_list_add(
 947                                         struct omap_mux_partition *partition,
 948                                         struct omap_mux *src)
 949 {
 950         struct omap_mux_entry *entry;
 951         struct omap_mux *m;
 952
 953         entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
 954         if (!entry)
 955                 return NULL;
 956
 957         m = &entry->mux;
 958         entry->mux = *src;
 959
 960 #ifdef CONFIG_OMAP_MUX
 961         if (omap_mux_copy_names(src, m)) {
 962                 kfree(entry);
 963                 return NULL;
 964         }
 965 #endif
 966
 967         mutex_lock(&muxmode_mutex);
 968         list_add_tail(&entry->node, &partition->muxmodes);
 969         mutex_unlock(&muxmode_mutex);
 970
 971         return m;
 972 }
 973
 974 /*
 975  * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
 976  * the GPIO to mux offset mapping that is needed for dynamic muxing
 977  * of GPIO pins for off-idle.
 978  */
 979 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
 980                                       struct omap_mux *superset)
 981 {
 982         while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
 983                 struct omap_mux *entry;
 984
 985 #ifdef CONFIG_OMAP_MUX
 986                 if (!superset->muxnames || !superset->muxnames[0]) {
 987                         superset++;
 988                         continue;
 989                 }
 990 #else
 991                 /* Skip pins that are not muxed as GPIO by bootloader */
 992                 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
 993                                     superset->reg_offset))) {
 994                         superset++;
 995                         continue;
 996                 }
 997 #endif
 998
 999                 entry = omap_mux_list_add(partition, superset);
1000                 if (!entry) {
1001                         pr_err("%s: Could not add entry\n", __func__);
1002                         return;
1003                 }
1004                 superset++;
1005         }
1006 }
1007
1008 #ifdef CONFIG_OMAP_MUX
1009
1010 static void omap_mux_init_package(struct omap_mux *superset,
1011                                   struct omap_mux *package_subset,
1012                                   struct omap_ball *package_balls)
1013 {
1014         if (package_subset)
1015                 omap_mux_package_fixup(package_subset, superset);
1016         if (package_balls)
1017                 omap_mux_package_init_balls(package_balls, superset);
1018 }
1019
1020 static void omap_mux_init_signals(struct omap_mux_partition *partition,
1021                                   struct omap_board_mux *board_mux)
1022 {
1023         omap_mux_set_cmdline_signals();
1024         omap_mux_write_array(partition, board_mux);
1025 }
1026
1027 #else
1028
1029 static void omap_mux_init_package(struct omap_mux *superset,
1030                                   struct omap_mux *package_subset,
1031                                   struct omap_ball *package_balls)
1032 {
1033 }
1034
1035 static void omap_mux_init_signals(struct omap_mux_partition *partition,
1036                                   struct omap_board_mux *board_mux)
1037 {
1038 }
1039
1040 #endif
1041
1042 static u32 mux_partitions_cnt;
1043
1044 int __init omap_mux_init(const char *name, u32 flags,
1045                          u32 mux_pbase, u32 mux_size,
1046                          struct omap_mux *superset,
1047                          struct omap_mux *package_subset,
1048                          struct omap_board_mux *board_mux,
1049                          struct omap_ball *package_balls)
1050 {
1051         struct omap_mux_partition *partition;
1052
1053         partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1054         if (!partition)
1055                 return -ENOMEM;
1056
1057         partition->name = name;
1058         partition->flags = flags;
1059         partition->size = mux_size;
1060         partition->phys = mux_pbase;
1061         partition->base = ioremap(mux_pbase, mux_size);
1062         if (!partition->base) {
1063                 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1064                         __func__, partition->phys);
1065                 kfree(partition);
1066                 return -ENODEV;
1067         }
1068
1069         INIT_LIST_HEAD(&partition->muxmodes);
1070
1071         list_add_tail(&partition->node, &mux_partitions);
1072         mux_partitions_cnt++;
1073         pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1074                 mux_partitions_cnt, partition->name, partition->flags);
1075
1076         omap_mux_init_package(superset, package_subset, package_balls);
1077         omap_mux_init_list(partition, superset);
1078         omap_mux_init_signals(partition, board_mux);
1079
1080         return 0;
1081 }
1082