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mux.c

/*
 * linux/arch/arm/mach-omap2/mux.c
 *
 * OMAP2, OMAP3 and OMAP4 pin multiplexing configurations
 *
 * Copyright (C) 2004 - 2010 Texas Instruments Inc.
 * Copyright (C) 2003 - 2008 Nokia Corporation
 *
 * Written by Tony Lindgren
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>

#include <asm/system.h>

#include <plat/omap_hwmod.h>

#include "control.h"
#include "mux.h"

#define OMAP_MUX_BASE_OFFSET        0x30  /* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ            0x5ca

00046 struct omap_mux_entry {
      struct omap_mux         mux;
      struct list_head  node;
};

static LIST_HEAD(mux_partitions);
static DEFINE_MUTEX(muxmode_mutex);

struct omap_mux_partition *omap_mux_get(const char *name)
{
      struct omap_mux_partition *partition;

      list_for_each_entry(partition, &mux_partitions, node) {
            if (!strcmp(name, partition->name))
                  return partition;
      }

      return NULL;
}

u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
{
      if (partition->flags & OMAP_MUX_REG_8BIT)
            return __raw_readb(partition->base + reg);
      else
            return __raw_readw(partition->base + reg);
}

void omap_mux_write(struct omap_mux_partition *partition, u16 val,
                     u16 reg)
{
      if (partition->flags & OMAP_MUX_REG_8BIT)
            __raw_writeb(val, partition->base + reg);
      else
            __raw_writew(val, partition->base + reg);
}

void omap_mux_write_array(struct omap_mux_partition *partition,
                         struct omap_board_mux *board_mux)
{
      while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
            omap_mux_write(partition, board_mux->value,
                         board_mux->reg_offset);
            board_mux++;
      }
}

#ifdef CONFIG_OMAP_MUX

static char *omap_mux_options;

static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
                              int gpio, int val)
{
      struct omap_mux_entry *e;
      struct omap_mux *gpio_mux = NULL;
      u16 old_mode;
      u16 mux_mode;
      int found = 0;
      struct list_head *muxmodes = &partition->muxmodes;

      if (!gpio)
            return -EINVAL;

      list_for_each_entry(e, muxmodes, node) {
            struct omap_mux *m = &e->mux;
            if (gpio == m->gpio) {
                  gpio_mux = m;
                  found++;
            }
      }

      if (found == 0) {
            pr_err("%s: Could not set gpio%i\n", __func__, gpio);
            return -ENODEV;
      }

      if (found > 1) {
            pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
                  found, gpio);
            return -EINVAL;
      }

      old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
      mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
      if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
            mux_mode |= OMAP_MUX_MODE3;
      else
            mux_mode |= OMAP_MUX_MODE4;
      pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
             gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
      omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);

      return 0;
}

int __init omap_mux_init_gpio(int gpio, int val)
{
      struct omap_mux_partition *partition;
      int ret;

      list_for_each_entry(partition, &mux_partitions, node) {
            ret = _omap_mux_init_gpio(partition, gpio, val);
            if (!ret)
                  return ret;
      }

      return -ENODEV;
}

static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
                              const char *muxname,
                              struct omap_mux **found_mux)
{
      struct omap_mux *mux = NULL;
      struct omap_mux_entry *e;
      const char *mode_name;
      int found = 0, found_mode, mode0_len = 0;
      struct list_head *muxmodes = &partition->muxmodes;

      mode_name = strchr(muxname, '.');
      if (mode_name) {
            mode0_len = strlen(muxname) - strlen(mode_name);
            mode_name++;
      } else {
            mode_name = muxname;
      }

      list_for_each_entry(e, muxmodes, node) {
            char *m0_entry;
            int i;

            mux = &e->mux;
            m0_entry = mux->muxnames[0];

            /* First check for full name in mode0.muxmode format */
            if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
                  continue;

            /* Then check for muxmode only */
            for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
                  char *mode_cur = mux->muxnames[i];

                  if (!mode_cur)
                        continue;

                  if (!strcmp(mode_name, mode_cur)) {
                        *found_mux = mux;
                        found++;
                        found_mode = i;
                  }
            }
      }

      if (found == 1) {
            return found_mode;
      }

      if (found > 1) {
            pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
                   found, muxname);
            return -EINVAL;
      }

      pr_err("%s: Could not find signal %s\n", __func__, muxname);

      return -ENODEV;
}

static int __init
omap_mux_get_by_name(const char *muxname,
                  struct omap_mux_partition **found_partition,
                  struct omap_mux **found_mux)
{
      struct omap_mux_partition *partition;

      list_for_each_entry(partition, &mux_partitions, node) {
            struct omap_mux *mux = NULL;
            int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
            if (mux_mode < 0)
                  continue;

            *found_partition = partition;
            *found_mux = mux;

            return mux_mode;
      }

      return -ENODEV;
}

int __init omap_mux_init_signal(const char *muxname, int val)
{
      struct omap_mux_partition *partition = NULL;
      struct omap_mux *mux = NULL;
      u16 old_mode;
      int mux_mode;

      mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
      if (mux_mode < 0)
            return mux_mode;

      old_mode = omap_mux_read(partition, mux->reg_offset);
      mux_mode |= val;
      pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
                   __func__, muxname, old_mode, mux_mode);
      omap_mux_write(partition, mux_mode, mux->reg_offset);

      return 0;
}

struct omap_hwmod_mux_info * __init
omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
{
      struct omap_hwmod_mux_info *hmux;
      int i;

      if (!bpads || nr_pads < 1)
            return NULL;

      hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
      if (!hmux)
            goto err1;

      hmux->nr_pads = nr_pads;

      hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
                        nr_pads, GFP_KERNEL);
      if (!hmux->pads)
            goto err2;

      for (i = 0; i < hmux->nr_pads; i++) {
            struct omap_mux_partition *partition;
            struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
            struct omap_mux *mux;
            int mux_mode;

            mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
            if (mux_mode < 0)
                  goto err3;
            if (!pad->partition)
                  pad->partition = partition;
            if (!pad->mux)
                  pad->mux = mux;

            pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
            if (!pad->name) {
                  int j;

                  for (j = i - 1; j >= 0; j--)
                        kfree(hmux->pads[j].name);
                  goto err3;
            }
            strcpy(pad->name, bpad->name);

            pad->flags = bpad->flags;
            pad->enable = bpad->enable;
            pad->idle = bpad->idle;
            pad->off = bpad->off;
            pr_debug("%s: Initialized %s\n", __func__, pad->name);
      }

      return hmux;

err3:
      kfree(hmux->pads);
err2:
      kfree(hmux);
err1:
      pr_err("%s: Could not allocate device mux entry\n", __func__);

      return NULL;
}

/* Assumes the calling function takes care of locking */
void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
{
      int i;

      for (i = 0; i < hmux->nr_pads; i++) {
            struct omap_device_pad *pad = &hmux->pads[i];
            int flags, val = -EINVAL;

            flags = pad->flags;

            switch (state) {
            case _HWMOD_STATE_ENABLED:
                  if (flags & OMAP_DEVICE_PAD_ENABLED)
                        break;
                  flags |= OMAP_DEVICE_PAD_ENABLED;
                  val = pad->enable;
                  pr_debug("%s: Enabling %s %x\n", __func__,
                              pad->name, val);
                  break;
            case _HWMOD_STATE_IDLE:
                  if (!(flags & OMAP_DEVICE_PAD_REMUX))
                        break;
                  flags &= ~OMAP_DEVICE_PAD_ENABLED;
                  val = pad->idle;
                  pr_debug("%s: Idling %s %x\n", __func__,
                              pad->name, val);
                  break;
            case _HWMOD_STATE_DISABLED:
            default:
                  /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
                  if (flags & OMAP_DEVICE_PAD_REMUX)
                        val = pad->off;
                  else
                        val = OMAP_MUX_MODE7;
                  flags &= ~OMAP_DEVICE_PAD_ENABLED;
                  pr_debug("%s: Disabling %s %x\n", __func__,
                              pad->name, val);
            };

            if (val >= 0) {
                  omap_mux_write(pad->partition, val,
                              pad->mux->reg_offset);
                  pad->flags = flags;
            }
      }
}

#ifdef CONFIG_DEBUG_FS

#define OMAP_MUX_MAX_NR_FLAGS 10
#define OMAP_MUX_TEST_FLAG(val, mask)                       \
      if (((val) & (mask)) == (mask)) {               \
            i++;                                \
            flags[i] =  #mask;                        \
      }

/* REVISIT: Add checking for non-optimal mux settings */
static inline void omap_mux_decode(struct seq_file *s, u16 val)
{
      char *flags[OMAP_MUX_MAX_NR_FLAGS];
      char mode[sizeof("OMAP_MUX_MODE") + 1];
      int i = -1;

      sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
      i++;
      flags[i] = mode;

      OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
      if (val & OMAP_OFF_EN) {
            if (!(val & OMAP_OFFOUT_EN)) {
                  if (!(val & OMAP_OFF_PULL_UP)) {
                        OMAP_MUX_TEST_FLAG(val,
                              OMAP_PIN_OFF_INPUT_PULLDOWN);
                  } else {
                        OMAP_MUX_TEST_FLAG(val,
                              OMAP_PIN_OFF_INPUT_PULLUP);
                  }
            } else {
                  if (!(val & OMAP_OFFOUT_VAL)) {
                        OMAP_MUX_TEST_FLAG(val,
                              OMAP_PIN_OFF_OUTPUT_LOW);
                  } else {
                        OMAP_MUX_TEST_FLAG(val,
                              OMAP_PIN_OFF_OUTPUT_HIGH);
                  }
            }
      }

      if (val & OMAP_INPUT_EN) {
            if (val & OMAP_PULL_ENA) {
                  if (!(val & OMAP_PULL_UP)) {
                        OMAP_MUX_TEST_FLAG(val,
                              OMAP_PIN_INPUT_PULLDOWN);
                  } else {
                        OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
                  }
            } else {
                  OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
            }
      } else {
            i++;
            flags[i] = "OMAP_PIN_OUTPUT";
      }

      do {
            seq_printf(s, "%s", flags[i]);
            if (i > 0)
                  seq_printf(s, " | ");
      } while (i-- > 0);
}

#define OMAP_MUX_DEFNAME_LEN  32

static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
{
      struct omap_mux_partition *partition = s->private;
      struct omap_mux_entry *e;
      u8 omap_gen = omap_rev() >> 28;

      list_for_each_entry(e, &partition->muxmodes, node) {
            struct omap_mux *m = &e->mux;
            char m0_def[OMAP_MUX_DEFNAME_LEN];
            char *m0_name = m->muxnames[0];
            u16 val;
            int i, mode;

            if (!m0_name)
                  continue;

            /* REVISIT: Needs to be updated if mode0 names get longer */
            for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
                  if (m0_name[i] == '\0') {
                        m0_def[i] = m0_name[i];
                        break;
                  }
                  m0_def[i] = toupper(m0_name[i]);
            }
            val = omap_mux_read(partition, m->reg_offset);
            mode = val & OMAP_MUX_MODE7;
            if (mode != 0)
                  seq_printf(s, "/* %s */\n", m->muxnames[mode]);

            /*
             * XXX: Might be revisited to support differences accross
             * same OMAP generation.
             */
            seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, m0_def);
            omap_mux_decode(s, val);
            seq_printf(s, "),\n");
      }

      return 0;
}

static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
{
      return single_open(file, omap_mux_dbg_board_show, inode->i_private);
}

static const struct file_operations omap_mux_dbg_board_fops = {
      .open       = omap_mux_dbg_board_open,
      .read       = seq_read,
      .llseek           = seq_lseek,
      .release    = single_release,
};

static struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
{
      struct omap_mux_partition *partition;

      list_for_each_entry(partition, &mux_partitions, node) {
            struct list_head *muxmodes = &partition->muxmodes;
            struct omap_mux_entry *e;

            list_for_each_entry(e, muxmodes, node) {
                  struct omap_mux *m = &e->mux;

                  if (m == mux)
                        return partition;
            }
      }

      return NULL;
}

static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
{
      struct omap_mux *m = s->private;
      struct omap_mux_partition *partition;
      const char *none = "NA";
      u16 val;
      int mode;

      partition = omap_mux_get_partition(m);
      if (!partition)
            return 0;

      val = omap_mux_read(partition, m->reg_offset);
      mode = val & OMAP_MUX_MODE7;

      seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
                  m->muxnames[0], m->muxnames[mode],
                  partition->phys + m->reg_offset, m->reg_offset, val,
                  m->balls[0] ? m->balls[0] : none,
                  m->balls[1] ? m->balls[1] : none);
      seq_printf(s, "mode: ");
      omap_mux_decode(s, val);
      seq_printf(s, "\n");
      seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
                  m->muxnames[0] ? m->muxnames[0] : none,
                  m->muxnames[1] ? m->muxnames[1] : none,
                  m->muxnames[2] ? m->muxnames[2] : none,
                  m->muxnames[3] ? m->muxnames[3] : none,
                  m->muxnames[4] ? m->muxnames[4] : none,
                  m->muxnames[5] ? m->muxnames[5] : none,
                  m->muxnames[6] ? m->muxnames[6] : none,
                  m->muxnames[7] ? m->muxnames[7] : none);

      return 0;
}

#define OMAP_MUX_MAX_ARG_CHAR  7

static ssize_t omap_mux_dbg_signal_write(struct file *file,
                               const char __user *user_buf,
                               size_t count, loff_t *ppos)
{
      char buf[OMAP_MUX_MAX_ARG_CHAR];
      struct seq_file *seqf;
      struct omap_mux *m;
      unsigned long val;
      int buf_size, ret;
      struct omap_mux_partition *partition;

      if (count > OMAP_MUX_MAX_ARG_CHAR)
            return -EINVAL;

      memset(buf, 0, sizeof(buf));
      buf_size = min(count, sizeof(buf) - 1);

      if (copy_from_user(buf, user_buf, buf_size))
            return -EFAULT;

      ret = strict_strtoul(buf, 0x10, &val);
      if (ret < 0)
            return ret;

      if (val > 0xffff)
            return -EINVAL;

      seqf = file->private_data;
      m = seqf->private;

      partition = omap_mux_get_partition(m);
      if (!partition)
            return -ENODEV;

      omap_mux_write(partition, (u16)val, m->reg_offset);
      *ppos += count;

      return count;
}

static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
{
      return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
}

static const struct file_operations omap_mux_dbg_signal_fops = {
      .open       = omap_mux_dbg_signal_open,
      .read       = seq_read,
      .write            = omap_mux_dbg_signal_write,
      .llseek           = seq_lseek,
      .release    = single_release,
};

static struct dentry *mux_dbg_dir;

static void __init omap_mux_dbg_create_entry(
                        struct omap_mux_partition *partition,
                        struct dentry *mux_dbg_dir)
{
      struct omap_mux_entry *e;

      list_for_each_entry(e, &partition->muxmodes, node) {
            struct omap_mux *m = &e->mux;

            (void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
                                m, &omap_mux_dbg_signal_fops);
      }
}

static void __init omap_mux_dbg_init(void)
{
      struct omap_mux_partition *partition;
      static struct dentry *mux_dbg_board_dir;

      mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
      if (!mux_dbg_dir)
            return;

      mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
      if (!mux_dbg_board_dir)
            return;

      list_for_each_entry(partition, &mux_partitions, node) {
            omap_mux_dbg_create_entry(partition, mux_dbg_dir);
            (void)debugfs_create_file(partition->name, S_IRUGO,
                                mux_dbg_board_dir, partition,
                                &omap_mux_dbg_board_fops);
      }
}

#else
static inline void omap_mux_dbg_init(void)
{
}
#endif      /* CONFIG_DEBUG_FS */

static void __init omap_mux_free_names(struct omap_mux *m)
{
      int i;

      for (i = 0; i < OMAP_MUX_NR_MODES; i++)
            kfree(m->muxnames[i]);

#ifdef CONFIG_DEBUG_FS
      for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
            kfree(m->balls[i]);
#endif

}

/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
static int __init omap_mux_late_init(void)
{
      struct omap_mux_partition *partition;

      list_for_each_entry(partition, &mux_partitions, node) {
            struct omap_mux_entry *e, *tmp;
            list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
                  struct omap_mux *m = &e->mux;
                  u16 mode = omap_mux_read(partition, m->reg_offset);

                  if (OMAP_MODE_GPIO(mode))
                        continue;

#ifndef CONFIG_DEBUG_FS
                  mutex_lock(&muxmode_mutex);
                  list_del(&e->node);
                  mutex_unlock(&muxmode_mutex);
                  omap_mux_free_names(m);
                  kfree(m);
#endif
            }
      }

      omap_mux_dbg_init();

      return 0;
}
late_initcall(omap_mux_late_init);

static void __init omap_mux_package_fixup(struct omap_mux *p,
                              struct omap_mux *superset)
{
      while (p->reg_offset !=  OMAP_MUX_TERMINATOR) {
            struct omap_mux *s = superset;
            int found = 0;

            while (s->reg_offset != OMAP_MUX_TERMINATOR) {
                  if (s->reg_offset == p->reg_offset) {
                        *s = *p;
                        found++;
                        break;
                  }
                  s++;
            }
            if (!found)
                  pr_err("%s: Unknown entry offset 0x%x\n", __func__,
                         p->reg_offset);
            p++;
      }
}

#ifdef CONFIG_DEBUG_FS

static void __init omap_mux_package_init_balls(struct omap_ball *b,
                        struct omap_mux *superset)
{
      while (b->reg_offset != OMAP_MUX_TERMINATOR) {
            struct omap_mux *s = superset;
            int found = 0;

            while (s->reg_offset != OMAP_MUX_TERMINATOR) {
                  if (s->reg_offset == b->reg_offset) {
                        s->balls[0] = b->balls[0];
                        s->balls[1] = b->balls[1];
                        found++;
                        break;
                  }
                  s++;
            }
            if (!found)
                  pr_err("%s: Unknown ball offset 0x%x\n", __func__,
                         b->reg_offset);
            b++;
      }
}

#else /* CONFIG_DEBUG_FS */

static inline void omap_mux_package_init_balls(struct omap_ball *b,
                              struct omap_mux *superset)
{
}

#endif      /* CONFIG_DEBUG_FS */

static int __init omap_mux_setup(char *options)
{
      if (!options)
            return 0;

      omap_mux_options = options;

      return 1;
}
__setup("omap_mux=", omap_mux_setup);

/*
 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
 * cmdline options only override the bootloader values.
 * During development, please enable CONFIG_DEBUG_FS, and use the
 * signal specific entries under debugfs.
 */
static void __init omap_mux_set_cmdline_signals(void)
{
      char *options, *next_opt, *token;

      if (!omap_mux_options)
            return;

      options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
      if (!options)
            return;

      strcpy(options, omap_mux_options);
      next_opt = options;

      while ((token = strsep(&next_opt, ",")) != NULL) {
            char *keyval, *name;
            unsigned long val;

            keyval = token;
            name = strsep(&keyval, "=");
            if (name) {
                  int res;

                  res = strict_strtoul(keyval, 0x10, &val);
                  if (res < 0)
                        continue;

                  omap_mux_init_signal(name, (u16)val);
            }
      }

      kfree(options);
}

static int __init omap_mux_copy_names(struct omap_mux *src,
                              struct omap_mux *dst)
{
      int i;

      for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
            if (src->muxnames[i]) {
                  dst->muxnames[i] =
                        kmalloc(strlen(src->muxnames[i]) + 1,
                              GFP_KERNEL);
                  if (!dst->muxnames[i])
                        goto free;
                  strcpy(dst->muxnames[i], src->muxnames[i]);
            }
      }

#ifdef CONFIG_DEBUG_FS
      for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
            if (src->balls[i]) {
                  dst->balls[i] =
                        kmalloc(strlen(src->balls[i]) + 1,
                              GFP_KERNEL);
                  if (!dst->balls[i])
                        goto free;
                  strcpy(dst->balls[i], src->balls[i]);
            }
      }
#endif

      return 0;

free:
      omap_mux_free_names(dst);
      return -ENOMEM;

}

#endif      /* CONFIG_OMAP_MUX */

static struct omap_mux *omap_mux_get_by_gpio(
                        struct omap_mux_partition *partition,
                        int gpio)
{
      struct omap_mux_entry *e;
      struct omap_mux *ret = NULL;

      list_for_each_entry(e, &partition->muxmodes, node) {
            struct omap_mux *m = &e->mux;
            if (m->gpio == gpio) {
                  ret = m;
                  break;
            }
      }

      return ret;
}

/* Needed for dynamic muxing of GPIO pins for off-idle */
u16 omap_mux_get_gpio(int gpio)
{
      struct omap_mux_partition *partition;
      struct omap_mux *m;

      list_for_each_entry(partition, &mux_partitions, node) {
            m = omap_mux_get_by_gpio(partition, gpio);
            if (m)
                  return omap_mux_read(partition, m->reg_offset);
      }

      if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
            pr_err("%s: Could not get gpio%i\n", __func__, gpio);

      return OMAP_MUX_TERMINATOR;
}

/* Needed for dynamic muxing of GPIO pins for off-idle */
void omap_mux_set_gpio(u16 val, int gpio)
{
      struct omap_mux_partition *partition;
      struct omap_mux *m = NULL;

      list_for_each_entry(partition, &mux_partitions, node) {
            m = omap_mux_get_by_gpio(partition, gpio);
            if (m) {
                  omap_mux_write(partition, val, m->reg_offset);
                  return;
            }
      }

      if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
            pr_err("%s: Could not set gpio%i\n", __func__, gpio);
}

static struct omap_mux * __init omap_mux_list_add(
                              struct omap_mux_partition *partition,
                              struct omap_mux *src)
{
      struct omap_mux_entry *entry;
      struct omap_mux *m;

      entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
      if (!entry)
            return NULL;

      m = &entry->mux;
      entry->mux = *src;

#ifdef CONFIG_OMAP_MUX
      if (omap_mux_copy_names(src, m)) {
            kfree(entry);
            return NULL;
      }
#endif

      mutex_lock(&muxmode_mutex);
      list_add_tail(&entry->node, &partition->muxmodes);
      mutex_unlock(&muxmode_mutex);

      return m;
}

/*
 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
 * the GPIO to mux offset mapping that is needed for dynamic muxing
 * of GPIO pins for off-idle.
 */
static void __init omap_mux_init_list(struct omap_mux_partition *partition,
                              struct omap_mux *superset)
{
      while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
            struct omap_mux *entry;

#ifdef CONFIG_OMAP_MUX
            if (!superset->muxnames || !superset->muxnames[0]) {
                  superset++;
                  continue;
            }
#else
            /* Skip pins that are not muxed as GPIO by bootloader */
            if (!OMAP_MODE_GPIO(omap_mux_read(partition,
                            superset->reg_offset))) {
                  superset++;
                  continue;
            }
#endif

            entry = omap_mux_list_add(partition, superset);
            if (!entry) {
                  pr_err("%s: Could not add entry\n", __func__);
                  return;
            }
            superset++;
      }
}

#ifdef CONFIG_OMAP_MUX

static void omap_mux_init_package(struct omap_mux *superset,
                          struct omap_mux *package_subset,
                          struct omap_ball *package_balls)
{
      if (package_subset)
            omap_mux_package_fixup(package_subset, superset);
      if (package_balls)
            omap_mux_package_init_balls(package_balls, superset);
}

static void omap_mux_init_signals(struct omap_mux_partition *partition,
                          struct omap_board_mux *board_mux)
{
      omap_mux_set_cmdline_signals();
      omap_mux_write_array(partition, board_mux);
}

#else

static void omap_mux_init_package(struct omap_mux *superset,
                          struct omap_mux *package_subset,
                          struct omap_ball *package_balls)
{
}

static void omap_mux_init_signals(struct omap_mux_partition *partition,
                          struct omap_board_mux *board_mux)
{
}

#endif

static u32 mux_partitions_cnt;

int __init omap_mux_init(const char *name, u32 flags,
                   u32 mux_pbase, u32 mux_size,
                   struct omap_mux *superset,
                   struct omap_mux *package_subset,
                   struct omap_board_mux *board_mux,
                   struct omap_ball *package_balls)
{
      struct omap_mux_partition *partition;

      partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
      if (!partition)
            return -ENOMEM;

      partition->name = name;
      partition->flags = flags;
      partition->size = mux_size;
      partition->phys = mux_pbase;
      partition->base = ioremap(mux_pbase, mux_size);
      if (!partition->base) {
            pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
                  __func__, partition->phys);
            return -ENODEV;
      }

      INIT_LIST_HEAD(&partition->muxmodes);

      list_add_tail(&partition->node, &mux_partitions);
      mux_partitions_cnt++;
      pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
            mux_partitions_cnt, partition->name, partition->flags);

      omap_mux_init_package(superset, package_subset, package_balls);
      omap_mux_init_list(partition, superset);
      omap_mux_init_signals(partition, board_mux);

      return 0;
}


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