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         if (!board_mux)
  87                 return;
  88
  89         while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
  90                 omap_mux_write(partition, board_mux->value,
  91                                board_mux->reg_offset);
  92                 board_mux++;
  93         }
  94 }
  95
  96 #ifdef CONFIG_OMAP_MUX
  97
  98 static char *omap_mux_options;
  99
 100 static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
 101                                       int gpio, int val)
 102 {
 103         struct omap_mux_entry *e;
 104         struct omap_mux *gpio_mux = NULL;
 105         u16 old_mode;
 106         u16 mux_mode;
 107         int found = 0;
 108         struct list_head *muxmodes = &partition->muxmodes;
 109
 110         if (!gpio)
 111                 return -EINVAL;
 112
 113         list_for_each_entry(e, muxmodes, node) {
 114                 struct omap_mux *m = &e->mux;
 115                 if (gpio == m->gpio) {
 116                         gpio_mux = m;
 117                         found++;
 118                 }
 119         }
 120
 121         if (found == 0) {
 122                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
 123                 return -ENODEV;
 124         }
 125
 126         if (found > 1) {
 127                 pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
 128                         found, gpio);
 129                 return -EINVAL;
 130         }
 131
 132         old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
 133         mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
 134         if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
 135                 mux_mode |= OMAP_MUX_MODE3;
 136         else
 137                 mux_mode |= OMAP_MUX_MODE4;
 138         pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
 139                  gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
 140         omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
 141
 142         return 0;
 143 }
 144
 145 int __init omap_mux_init_gpio(int gpio, int val)
 146 {
 147         struct omap_mux_partition *partition;
 148         int ret;
 149
 150         list_for_each_entry(partition, &mux_partitions, node) {
 151                 ret = _omap_mux_init_gpio(partition, gpio, val);
 152                 if (!ret)
 153                         return ret;
 154         }
 155
 156         return -ENODEV;
 157 }
 158
 159 static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
 160                                         const char *muxname,
 161                                         struct omap_mux **found_mux)
 162 {
 163         struct omap_mux *mux = NULL;
 164         struct omap_mux_entry *e;
 165         const char *mode_name;
 166         int found = 0, found_mode = 0, mode0_len = 0;
 167         struct list_head *muxmodes = &partition->muxmodes;
 168
 169         mode_name = strchr(muxname, '.');
 170         if (mode_name) {
 171                 mode0_len = strlen(muxname) - strlen(mode_name);
 172                 mode_name++;
 173         } else {
 174                 mode_name = muxname;
 175         }
 176
 177         list_for_each_entry(e, muxmodes, node) {
 178                 char *m0_entry;
 179                 int i;
 180
 181                 mux = &e->mux;
 182                 m0_entry = mux->muxnames[0];
 183
 184                 /* First check for full name in mode0.muxmode format */
 185                 if (mode0_len)
 186                         if (strncmp(muxname, m0_entry, mode0_len) ||
 187                             (strlen(m0_entry) != mode0_len))
 188                                 continue;
 189
 190                 /* Then check for muxmode only */
 191                 for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 192                         char *mode_cur = mux->muxnames[i];
 193
 194                         if (!mode_cur)
 195                                 continue;
 196
 197                         if (!strcmp(mode_name, mode_cur)) {
 198                                 *found_mux = mux;
 199                                 found++;
 200                                 found_mode = i;
 201                         }
 202                 }
 203         }
 204
 205         if (found == 1) {
 206                 return found_mode;
 207         }
 208
 209         if (found > 1) {
 210                 pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
 211                        found, muxname);
 212                 return -EINVAL;
 213         }
 214
 215         pr_err("%s: Could not find signal %s\n", __func__, muxname);
 216
 217         return -ENODEV;
 218 }
 219
 220 static int __init
 221 omap_mux_get_by_name(const char *muxname,
 222                         struct omap_mux_partition **found_partition,
 223                         struct omap_mux **found_mux)
 224 {
 225         struct omap_mux_partition *partition;
 226
 227         list_for_each_entry(partition, &mux_partitions, node) {
 228                 struct omap_mux *mux = NULL;
 229                 int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
 230                 if (mux_mode < 0)
 231                         continue;
 232
 233                 *found_partition = partition;
 234                 *found_mux = mux;
 235
 236                 return mux_mode;
 237         }
 238
 239         return -ENODEV;
 240 }
 241
 242 int __init omap_mux_init_signal(const char *muxname, int val)
 243 {
 244         struct omap_mux_partition *partition = NULL;
 245         struct omap_mux *mux = NULL;
 246         u16 old_mode;
 247         int mux_mode;
 248
 249         mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
 250         if (mux_mode < 0)
 251                 return mux_mode;
 252
 253         old_mode = omap_mux_read(partition, mux->reg_offset);
 254         mux_mode |= val;
 255         pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
 256                          __func__, muxname, old_mode, mux_mode);
 257         omap_mux_write(partition, mux_mode, mux->reg_offset);
 258
 259         return 0;
 260 }
 261
 262 struct omap_hwmod_mux_info * __init
 263 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
 264 {
 265         struct omap_hwmod_mux_info *hmux;
 266         int i, nr_pads_dynamic = 0;
 267
 268         if (!bpads || nr_pads < 1)
 269                 return NULL;
 270
 271         hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
 272         if (!hmux)
 273                 goto err1;
 274
 275         hmux->nr_pads = nr_pads;
 276
 277         hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
 278                                 nr_pads, GFP_KERNEL);
 279         if (!hmux->pads)
 280                 goto err2;
 281
 282         for (i = 0; i < hmux->nr_pads; i++) {
 283                 struct omap_mux_partition *partition;
 284                 struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
 285                 struct omap_mux *mux;
 286                 int mux_mode;
 287
 288                 mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
 289                 if (mux_mode < 0)
 290                         goto err3;
 291                 if (!pad->partition)
 292                         pad->partition = partition;
 293                 if (!pad->mux)
 294                         pad->mux = mux;
 295
 296                 pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
 297                 if (!pad->name) {
 298                         int j;
 299
 300                         for (j = i - 1; j >= 0; j--)
 301                                 kfree(hmux->pads[j].name);
 302                         goto err3;
 303                 }
 304                 strcpy(pad->name, bpad->name);
 305
 306                 pad->flags = bpad->flags;
 307                 pad->enable = bpad->enable;
 308                 pad->idle = bpad->idle;
 309                 pad->off = bpad->off;
 310
 311                 if (pad->flags & OMAP_DEVICE_PAD_REMUX)
 312                         nr_pads_dynamic++;
 313
 314                 pr_debug("%s: Initialized %s\n", __func__, pad->name);
 315         }
 316
 317         if (!nr_pads_dynamic)
 318                 return hmux;
 319
 320         /*
 321          * Add pads that need dynamic muxing into a separate list
 322          */
 323
 324         hmux->nr_pads_dynamic = nr_pads_dynamic;
 325         hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
 326                                         nr_pads_dynamic, GFP_KERNEL);
 327         if (!hmux->pads_dynamic) {
 328                 pr_err("%s: Could not allocate dynamic pads\n", __func__);
 329                 return hmux;
 330         }
 331
 332         nr_pads_dynamic = 0;
 333         for (i = 0; i < hmux->nr_pads; i++) {
 334                 struct omap_device_pad *pad = &hmux->pads[i];
 335
 336                 if (pad->flags & OMAP_DEVICE_PAD_REMUX) {
 337                         pr_debug("%s: pad %s tagged dynamic\n",
 338                                         __func__, pad->name);
 339                         hmux->pads_dynamic[nr_pads_dynamic] = pad;
 340                         nr_pads_dynamic++;
 341                 }
 342         }
 343
 344         return hmux;
 345
 346 err3:
 347         kfree(hmux->pads);
 348 err2:
 349         kfree(hmux);
 350 err1:
 351         pr_err("%s: Could not allocate device mux entry\n", __func__);
 352
 353         return NULL;
 354 }
 355
 356 /* Assumes the calling function takes care of locking */
 357 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 358 {
 359         int i;
 360
 361         /* Runtime idling of dynamic pads */
 362         if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
 363                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 364                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 365                         int val = -EINVAL;
 366
 367                         val = pad->idle;
 368                         omap_mux_write(pad->partition, val,
 369                                         pad->mux->reg_offset);
 370                 }
 371
 372                 return;
 373         }
 374
 375         /* Runtime enabling of dynamic pads */
 376         if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic
 377                                         && hmux->enabled) {
 378                 for (i = 0; i < hmux->nr_pads_dynamic; i++) {
 379                         struct omap_device_pad *pad = hmux->pads_dynamic[i];
 380                         int val = -EINVAL;
 381
 382                         val = pad->enable;
 383                         omap_mux_write(pad->partition, val,
 384                                         pad->mux->reg_offset);
 385                 }
 386
 387                 return;
 388         }
 389
 390         /* Enabling or disabling of all pads */
 391         for (i = 0; i < hmux->nr_pads; i++) {
 392                 struct omap_device_pad *pad = &hmux->pads[i];
 393                 int flags, val = -EINVAL;
 394
 395                 flags = pad->flags;
 396
 397                 switch (state) {
 398                 case _HWMOD_STATE_ENABLED:
 399                         val = pad->enable;
 400                         pr_debug("%s: Enabling %s %x\n", __func__,
 401                                         pad->name, val);
 402                         break;
 403                 case _HWMOD_STATE_DISABLED:
 404                         /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
 405                         if (flags & OMAP_DEVICE_PAD_REMUX)
 406                                 val = pad->off;
 407                         else
 408                                 val = OMAP_MUX_MODE7;
 409                         pr_debug("%s: Disabling %s %x\n", __func__,
 410                                         pad->name, val);
 411                         break;
 412                 default:
 413                         /* Nothing to be done */
 414                         break;
 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 across
 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 = kstrdup(omap_mux_options, GFP_KERNEL);
 827         if (!options)
 828                 return;
 829
 830         next_opt = options;
 831
 832         while ((token = strsep(&next_opt, ",")) != NULL) {
 833                 char *keyval, *name;
 834                 unsigned long val;
 835
 836                 keyval = token;
 837                 name = strsep(&keyval, "=");
 838                 if (name) {
 839                         int res;
 840
 841                         res = strict_strtoul(keyval, 0x10, &val);
 842                         if (res < 0)
 843                                 continue;
 844
 845                         omap_mux_init_signal(name, (u16)val);
 846                 }
 847         }
 848
 849         kfree(options);
 850 }
 851
 852 static int __init omap_mux_copy_names(struct omap_mux *src,
 853                                       struct omap_mux *dst)
 854 {
 855         int i;
 856
 857         for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
 858                 if (src->muxnames[i]) {
 859                         dst->muxnames[i] = kstrdup(src->muxnames[i],
 860                                                    GFP_KERNEL);
 861                         if (!dst->muxnames[i])
 862                                 goto free;
 863                 }
 864         }
 865
 866 #ifdef CONFIG_DEBUG_FS
 867         for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
 868                 if (src->balls[i]) {
 869                         dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
 870                         if (!dst->balls[i])
 871                                 goto free;
 872                 }
 873         }
 874 #endif
 875
 876         return 0;
 877
 878 free:
 879         omap_mux_free_names(dst);
 880         return -ENOMEM;
 881
 882 }
 883
 884 #endif  /* CONFIG_OMAP_MUX */
 885
 886 static struct omap_mux *omap_mux_get_by_gpio(
 887                                 struct omap_mux_partition *partition,
 888                                 int gpio)
 889 {
 890         struct omap_mux_entry *e;
 891         struct omap_mux *ret = NULL;
 892
 893         list_for_each_entry(e, &partition->muxmodes, node) {
 894                 struct omap_mux *m = &e->mux;
 895                 if (m->gpio == gpio) {
 896                         ret = m;
 897                         break;
 898                 }
 899         }
 900
 901         return ret;
 902 }
 903
 904 /* Needed for dynamic muxing of GPIO pins for off-idle */
 905 u16 omap_mux_get_gpio(int gpio)
 906 {
 907         struct omap_mux_partition *partition;
 908         struct omap_mux *m = NULL;
 909
 910         list_for_each_entry(partition, &mux_partitions, node) {
 911                 m = omap_mux_get_by_gpio(partition, gpio);
 912                 if (m)
 913                         return omap_mux_read(partition, m->reg_offset);
 914         }
 915
 916         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 917                 pr_err("%s: Could not get gpio%i\n", __func__, gpio);
 918
 919         return OMAP_MUX_TERMINATOR;
 920 }
 921
 922 /* Needed for dynamic muxing of GPIO pins for off-idle */
 923 void omap_mux_set_gpio(u16 val, int gpio)
 924 {
 925         struct omap_mux_partition *partition;
 926         struct omap_mux *m = NULL;
 927
 928         list_for_each_entry(partition, &mux_partitions, node) {
 929                 m = omap_mux_get_by_gpio(partition, gpio);
 930                 if (m) {
 931                         omap_mux_write(partition, val, m->reg_offset);
 932                         return;
 933                 }
 934         }
 935
 936         if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
 937                 pr_err("%s: Could not set gpio%i\n", __func__, gpio);
 938 }
 939
 940 static struct omap_mux * __init omap_mux_list_add(
 941                                         struct omap_mux_partition *partition,
 942                                         struct omap_mux *src)
 943 {
 944         struct omap_mux_entry *entry;
 945         struct omap_mux *m;
 946
 947         entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
 948         if (!entry)
 949                 return NULL;
 950
 951         m = &entry->mux;
 952         entry->mux = *src;
 953
 954 #ifdef CONFIG_OMAP_MUX
 955         if (omap_mux_copy_names(src, m)) {
 956                 kfree(entry);
 957                 return NULL;
 958         }
 959 #endif
 960
 961         mutex_lock(&muxmode_mutex);
 962         list_add_tail(&entry->node, &partition->muxmodes);
 963         mutex_unlock(&muxmode_mutex);
 964
 965         return m;
 966 }
 967
 968 /*
 969  * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
 970  * the GPIO to mux offset mapping that is needed for dynamic muxing
 971  * of GPIO pins for off-idle.
 972  */
 973 static void __init omap_mux_init_list(struct omap_mux_partition *partition,
 974                                       struct omap_mux *superset)
 975 {
 976         while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
 977                 struct omap_mux *entry;
 978
 979 #ifdef CONFIG_OMAP_MUX
 980                 if (!superset->muxnames || !superset->muxnames[0]) {
 981                         superset++;
 982                         continue;
 983                 }
 984 #else
 985                 /* Skip pins that are not muxed as GPIO by bootloader */
 986                 if (!OMAP_MODE_GPIO(omap_mux_read(partition,
 987                                     superset->reg_offset))) {
 988                         superset++;
 989                         continue;
 990                 }
 991 #endif
 992
 993                 entry = omap_mux_list_add(partition, superset);
 994                 if (!entry) {
 995                         pr_err("%s: Could not add entry\n", __func__);
 996                         return;
 997                 }
 998                 superset++;
 999         }
1000 }
1001
1002 #ifdef CONFIG_OMAP_MUX
1003
1004 static void omap_mux_init_package(struct omap_mux *superset,
1005                                   struct omap_mux *package_subset,
1006                                   struct omap_ball *package_balls)
1007 {
1008         if (package_subset)
1009                 omap_mux_package_fixup(package_subset, superset);
1010         if (package_balls)
1011                 omap_mux_package_init_balls(package_balls, superset);
1012 }
1013
1014 static void omap_mux_init_signals(struct omap_mux_partition *partition,
1015                                   struct omap_board_mux *board_mux)
1016 {
1017         omap_mux_set_cmdline_signals();
1018         omap_mux_write_array(partition, board_mux);
1019 }
1020
1021 #else
1022
1023 static void omap_mux_init_package(struct omap_mux *superset,
1024                                   struct omap_mux *package_subset,
1025                                   struct omap_ball *package_balls)
1026 {
1027 }
1028
1029 static void omap_mux_init_signals(struct omap_mux_partition *partition,
1030                                   struct omap_board_mux *board_mux)
1031 {
1032 }
1033
1034 #endif
1035
1036 static u32 mux_partitions_cnt;
1037
1038 int __init omap_mux_init(const char *name, u32 flags,
1039                          u32 mux_pbase, u32 mux_size,
1040                          struct omap_mux *superset,
1041                          struct omap_mux *package_subset,
1042                          struct omap_board_mux *board_mux,
1043                          struct omap_ball *package_balls)
1044 {
1045         struct omap_mux_partition *partition;
1046
1047         partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
1048         if (!partition)
1049                 return -ENOMEM;
1050
1051         partition->name = name;
1052         partition->flags = flags;
1053         partition->size = mux_size;
1054         partition->phys = mux_pbase;
1055         partition->base = ioremap(mux_pbase, mux_size);
1056         if (!partition->base) {
1057                 pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
1058                         __func__, partition->phys);
1059                 kfree(partition);
1060                 return -ENODEV;
1061         }
1062
1063         INIT_LIST_HEAD(&partition->muxmodes);
1064
1065         list_add_tail(&partition->node, &mux_partitions);
1066         mux_partitions_cnt++;
1067         pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
1068                 mux_partitions_cnt, partition->name, partition->flags);
1069
1070         omap_mux_init_package(superset, package_subset, package_balls);
1071         omap_mux_init_list(partition, superset);
1072         omap_mux_init_signals(partition, board_mux);
1073
1074         return 0;
1075 }
1076