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pinmux.c

/*
 * linux/arch/arm/mach-tegra/pinmux.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/io.h>

#include <mach/iomap.h>
#include <mach/pinmux.h>

#define HSM_EN(reg)     (((reg) >> 2) & 0x1)
#define SCHMT_EN(reg)   (((reg) >> 3) & 0x1)
#define LPMD(reg) (((reg) >> 4) & 0x3)
#define DRVDN(reg)      (((reg) >> 12) & 0x1f)
#define DRVUP(reg)      (((reg) >> 20) & 0x1f)
#define SLWR(reg) (((reg) >> 28) & 0x3)
#define SLWF(reg) (((reg) >> 30) & 0x3)

static const struct tegra_pingroup_desc *const pingroups = tegra_soc_pingroups;
static const struct tegra_drive_pingroup_desc *const drive_pingroups = tegra_soc_drive_pingroups;

static char *tegra_mux_names[TEGRA_MAX_MUX] = {
      [TEGRA_MUX_AHB_CLK] = "AHB_CLK",
      [TEGRA_MUX_APB_CLK] = "APB_CLK",
      [TEGRA_MUX_AUDIO_SYNC] = "AUDIO_SYNC",
      [TEGRA_MUX_CRT] = "CRT",
      [TEGRA_MUX_DAP1] = "DAP1",
      [TEGRA_MUX_DAP2] = "DAP2",
      [TEGRA_MUX_DAP3] = "DAP3",
      [TEGRA_MUX_DAP4] = "DAP4",
      [TEGRA_MUX_DAP5] = "DAP5",
      [TEGRA_MUX_DISPLAYA] = "DISPLAYA",
      [TEGRA_MUX_DISPLAYB] = "DISPLAYB",
      [TEGRA_MUX_EMC_TEST0_DLL] = "EMC_TEST0_DLL",
      [TEGRA_MUX_EMC_TEST1_DLL] = "EMC_TEST1_DLL",
      [TEGRA_MUX_GMI] = "GMI",
      [TEGRA_MUX_GMI_INT] = "GMI_INT",
      [TEGRA_MUX_HDMI] = "HDMI",
      [TEGRA_MUX_I2C] = "I2C",
      [TEGRA_MUX_I2C2] = "I2C2",
      [TEGRA_MUX_I2C3] = "I2C3",
      [TEGRA_MUX_IDE] = "IDE",
      [TEGRA_MUX_IRDA] = "IRDA",
      [TEGRA_MUX_KBC] = "KBC",
      [TEGRA_MUX_MIO] = "MIO",
      [TEGRA_MUX_MIPI_HS] = "MIPI_HS",
      [TEGRA_MUX_NAND] = "NAND",
      [TEGRA_MUX_OSC] = "OSC",
      [TEGRA_MUX_OWR] = "OWR",
      [TEGRA_MUX_PCIE] = "PCIE",
      [TEGRA_MUX_PLLA_OUT] = "PLLA_OUT",
      [TEGRA_MUX_PLLC_OUT1] = "PLLC_OUT1",
      [TEGRA_MUX_PLLM_OUT1] = "PLLM_OUT1",
      [TEGRA_MUX_PLLP_OUT2] = "PLLP_OUT2",
      [TEGRA_MUX_PLLP_OUT3] = "PLLP_OUT3",
      [TEGRA_MUX_PLLP_OUT4] = "PLLP_OUT4",
      [TEGRA_MUX_PWM] = "PWM",
      [TEGRA_MUX_PWR_INTR] = "PWR_INTR",
      [TEGRA_MUX_PWR_ON] = "PWR_ON",
      [TEGRA_MUX_RTCK] = "RTCK",
      [TEGRA_MUX_SDIO1] = "SDIO1",
      [TEGRA_MUX_SDIO2] = "SDIO2",
      [TEGRA_MUX_SDIO3] = "SDIO3",
      [TEGRA_MUX_SDIO4] = "SDIO4",
      [TEGRA_MUX_SFLASH] = "SFLASH",
      [TEGRA_MUX_SPDIF] = "SPDIF",
      [TEGRA_MUX_SPI1] = "SPI1",
      [TEGRA_MUX_SPI2] = "SPI2",
      [TEGRA_MUX_SPI2_ALT] = "SPI2_ALT",
      [TEGRA_MUX_SPI3] = "SPI3",
      [TEGRA_MUX_SPI4] = "SPI4",
      [TEGRA_MUX_TRACE] = "TRACE",
      [TEGRA_MUX_TWC] = "TWC",
      [TEGRA_MUX_UARTA] = "UARTA",
      [TEGRA_MUX_UARTB] = "UARTB",
      [TEGRA_MUX_UARTC] = "UARTC",
      [TEGRA_MUX_UARTD] = "UARTD",
      [TEGRA_MUX_UARTE] = "UARTE",
      [TEGRA_MUX_ULPI] = "ULPI",
      [TEGRA_MUX_VI] = "VI",
      [TEGRA_MUX_VI_SENSOR_CLK] = "VI_SENSOR_CLK",
      [TEGRA_MUX_XIO] = "XIO",
      [TEGRA_MUX_SAFE] = "<safe>",
};

static const char *tegra_drive_names[TEGRA_MAX_DRIVE] = {
      [TEGRA_DRIVE_DIV_8] = "DIV_8",
      [TEGRA_DRIVE_DIV_4] = "DIV_4",
      [TEGRA_DRIVE_DIV_2] = "DIV_2",
      [TEGRA_DRIVE_DIV_1] = "DIV_1",
};

static const char *tegra_slew_names[TEGRA_MAX_SLEW] = {
      [TEGRA_SLEW_FASTEST] = "FASTEST",
      [TEGRA_SLEW_FAST] = "FAST",
      [TEGRA_SLEW_SLOW] = "SLOW",
      [TEGRA_SLEW_SLOWEST] = "SLOWEST",
};

static DEFINE_SPINLOCK(mux_lock);

static const char *pingroup_name(enum tegra_pingroup pg)
{
      if (pg < 0 || pg >=  TEGRA_MAX_PINGROUP)
            return "<UNKNOWN>";

      return pingroups[pg].name;
}

static const char *func_name(enum tegra_mux_func func)
{
      if (func == TEGRA_MUX_RSVD1)
            return "RSVD1";

      if (func == TEGRA_MUX_RSVD2)
            return "RSVD2";

      if (func == TEGRA_MUX_RSVD3)
            return "RSVD3";

      if (func == TEGRA_MUX_RSVD4)
            return "RSVD4";

      if (func == TEGRA_MUX_NONE)
            return "NONE";

      if (func < 0 || func >=  TEGRA_MAX_MUX)
            return "<UNKNOWN>";

      return tegra_mux_names[func];
}


static const char *tri_name(unsigned long val)
{
      return val ? "TRISTATE" : "NORMAL";
}

static const char *pupd_name(unsigned long val)
{
      switch (val) {
      case 0:
            return "NORMAL";

      case 1:
            return "PULL_DOWN";

      case 2:
            return "PULL_UP";

      default:
            return "RSVD";
      }
}


static inline unsigned long pg_readl(unsigned long offset)
{
      return readl(IO_TO_VIRT(TEGRA_APB_MISC_BASE + offset));
}

static inline void pg_writel(unsigned long value, unsigned long offset)
{
      writel(value, IO_TO_VIRT(TEGRA_APB_MISC_BASE + offset));
}

static int tegra_pinmux_set_func(const struct tegra_pingroup_config *config)
{
      int mux = -1;
      int i;
      unsigned long reg;
      unsigned long flags;
      enum tegra_pingroup pg = config->pingroup;
      enum tegra_mux_func func = config->func;

      if (pg < 0 || pg >=  TEGRA_MAX_PINGROUP)
            return -ERANGE;

      if (pingroups[pg].mux_reg < 0)
            return -EINVAL;

      if (func < 0)
            return -ERANGE;

      if (func == TEGRA_MUX_SAFE)
            func = pingroups[pg].func_safe;

      if (func & TEGRA_MUX_RSVD) {
            mux = func & 0x3;
      } else {
            for (i = 0; i < 4; i++) {
                  if (pingroups[pg].funcs[i] == func) {
                        mux = i;
                        break;
                  }
            }
      }

      if (mux < 0)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(pingroups[pg].mux_reg);
      reg &= ~(0x3 << pingroups[pg].mux_bit);
      reg |= mux << pingroups[pg].mux_bit;
      pg_writel(reg, pingroups[pg].mux_reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

int tegra_pinmux_set_tristate(enum tegra_pingroup pg,
      enum tegra_tristate tristate)
{
      unsigned long reg;
      unsigned long flags;

      if (pg < 0 || pg >=  TEGRA_MAX_PINGROUP)
            return -ERANGE;

      if (pingroups[pg].tri_reg < 0)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(pingroups[pg].tri_reg);
      reg &= ~(0x1 << pingroups[pg].tri_bit);
      if (tristate)
            reg |= 1 << pingroups[pg].tri_bit;
      pg_writel(reg, pingroups[pg].tri_reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

int tegra_pinmux_set_pullupdown(enum tegra_pingroup pg,
      enum tegra_pullupdown pupd)
{
      unsigned long reg;
      unsigned long flags;

      if (pg < 0 || pg >=  TEGRA_MAX_PINGROUP)
            return -ERANGE;

      if (pingroups[pg].pupd_reg < 0)
            return -EINVAL;

      if (pupd != TEGRA_PUPD_NORMAL &&
          pupd != TEGRA_PUPD_PULL_DOWN &&
          pupd != TEGRA_PUPD_PULL_UP)
            return -EINVAL;


      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(pingroups[pg].pupd_reg);
      reg &= ~(0x3 << pingroups[pg].pupd_bit);
      reg |= pupd << pingroups[pg].pupd_bit;
      pg_writel(reg, pingroups[pg].pupd_reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static void tegra_pinmux_config_pingroup(const struct tegra_pingroup_config *config)
{
      enum tegra_pingroup pingroup = config->pingroup;
      enum tegra_mux_func func     = config->func;
      enum tegra_pullupdown pupd   = config->pupd;
      enum tegra_tristate tristate = config->tristate;
      int err;

      if (pingroups[pingroup].mux_reg >= 0) {
            err = tegra_pinmux_set_func(config);
            if (err < 0)
                  pr_err("pinmux: can't set pingroup %s func to %s: %d\n",
                         pingroup_name(pingroup), func_name(func), err);
      }

      if (pingroups[pingroup].pupd_reg >= 0) {
            err = tegra_pinmux_set_pullupdown(pingroup, pupd);
            if (err < 0)
                  pr_err("pinmux: can't set pingroup %s pullupdown to %s: %d\n",
                         pingroup_name(pingroup), pupd_name(pupd), err);
      }

      if (pingroups[pingroup].tri_reg >= 0) {
            err = tegra_pinmux_set_tristate(pingroup, tristate);
            if (err < 0)
                  pr_err("pinmux: can't set pingroup %s tristate to %s: %d\n",
                         pingroup_name(pingroup), tri_name(func), err);
      }
}

void tegra_pinmux_config_table(const struct tegra_pingroup_config *config, int len)
{
      int i;

      for (i = 0; i < len; i++)
            tegra_pinmux_config_pingroup(&config[i]);
}

static const char *drive_pinmux_name(enum tegra_drive_pingroup pg)
{
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return "<UNKNOWN>";

      return drive_pingroups[pg].name;
}

static const char *enable_name(unsigned long val)
{
      return val ? "ENABLE" : "DISABLE";
}

static const char *drive_name(unsigned long val)
{
      if (val >= TEGRA_MAX_DRIVE)
            return "<UNKNOWN>";

      return tegra_drive_names[val];
}

static const char *slew_name(unsigned long val)
{
      if (val >= TEGRA_MAX_SLEW)
            return "<UNKNOWN>";

      return tegra_slew_names[val];
}

static int tegra_drive_pinmux_set_hsm(enum tegra_drive_pingroup pg,
      enum tegra_hsm hsm)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (hsm != TEGRA_HSM_ENABLE && hsm != TEGRA_HSM_DISABLE)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      if (hsm == TEGRA_HSM_ENABLE)
            reg |= (1 << 2);
      else
            reg &= ~(1 << 2);
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_schmitt(enum tegra_drive_pingroup pg,
      enum tegra_schmitt schmitt)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (schmitt != TEGRA_SCHMITT_ENABLE && schmitt != TEGRA_SCHMITT_DISABLE)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      if (schmitt == TEGRA_SCHMITT_ENABLE)
            reg |= (1 << 3);
      else
            reg &= ~(1 << 3);
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_drive(enum tegra_drive_pingroup pg,
      enum tegra_drive drive)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (drive < 0 || drive >= TEGRA_MAX_DRIVE)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      reg &= ~(0x3 << 4);
      reg |= drive << 4;
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_pull_down(enum tegra_drive_pingroup pg,
      enum tegra_pull_strength pull_down)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (pull_down < 0 || pull_down >= TEGRA_MAX_PULL)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      reg &= ~(0x1f << 12);
      reg |= pull_down << 12;
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_pull_up(enum tegra_drive_pingroup pg,
      enum tegra_pull_strength pull_up)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (pull_up < 0 || pull_up >= TEGRA_MAX_PULL)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      reg &= ~(0x1f << 12);
      reg |= pull_up << 12;
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_slew_rising(enum tegra_drive_pingroup pg,
      enum tegra_slew slew_rising)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (slew_rising < 0 || slew_rising >= TEGRA_MAX_SLEW)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      reg &= ~(0x3 << 28);
      reg |= slew_rising << 28;
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static int tegra_drive_pinmux_set_slew_falling(enum tegra_drive_pingroup pg,
      enum tegra_slew slew_falling)
{
      unsigned long flags;
      u32 reg;
      if (pg < 0 || pg >=  TEGRA_MAX_DRIVE_PINGROUP)
            return -ERANGE;

      if (slew_falling < 0 || slew_falling >= TEGRA_MAX_SLEW)
            return -EINVAL;

      spin_lock_irqsave(&mux_lock, flags);

      reg = pg_readl(drive_pingroups[pg].reg);
      reg &= ~(0x3 << 30);
      reg |= slew_falling << 30;
      pg_writel(reg, drive_pingroups[pg].reg);

      spin_unlock_irqrestore(&mux_lock, flags);

      return 0;
}

static void tegra_drive_pinmux_config_pingroup(enum tegra_drive_pingroup pingroup,
                                enum tegra_hsm hsm,
                                enum tegra_schmitt schmitt,
                                enum tegra_drive drive,
                                enum tegra_pull_strength pull_down,
                                enum tegra_pull_strength pull_up,
                                enum tegra_slew slew_rising,
                                enum tegra_slew slew_falling)
{
      int err;

      err = tegra_drive_pinmux_set_hsm(pingroup, hsm);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s hsm to %s: %d\n",
                  drive_pinmux_name(pingroup),
                  enable_name(hsm), err);

      err = tegra_drive_pinmux_set_schmitt(pingroup, schmitt);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s schmitt to %s: %d\n",
                  drive_pinmux_name(pingroup),
                  enable_name(schmitt), err);

      err = tegra_drive_pinmux_set_drive(pingroup, drive);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s drive to %s: %d\n",
                  drive_pinmux_name(pingroup),
                  drive_name(drive), err);

      err = tegra_drive_pinmux_set_pull_down(pingroup, pull_down);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s pull down to %d: %d\n",
                  drive_pinmux_name(pingroup),
                  pull_down, err);

      err = tegra_drive_pinmux_set_pull_up(pingroup, pull_up);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s pull up to %d: %d\n",
                  drive_pinmux_name(pingroup),
                  pull_up, err);

      err = tegra_drive_pinmux_set_slew_rising(pingroup, slew_rising);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s rising slew to %s: %d\n",
                  drive_pinmux_name(pingroup),
                  slew_name(slew_rising), err);

      err = tegra_drive_pinmux_set_slew_falling(pingroup, slew_falling);
      if (err < 0)
            pr_err("pinmux: can't set pingroup %s falling slew to %s: %d\n",
                  drive_pinmux_name(pingroup),
                  slew_name(slew_falling), err);
}

void tegra_drive_pinmux_config_table(struct tegra_drive_pingroup_config *config,
      int len)
{
      int i;

      for (i = 0; i < len; i++)
            tegra_drive_pinmux_config_pingroup(config[i].pingroup,
                                         config[i].hsm,
                                         config[i].schmitt,
                                         config[i].drive,
                                         config[i].pull_down,
                                         config[i].pull_up,
                                         config[i].slew_rising,
                                         config[i].slew_falling);
}

void tegra_pinmux_set_safe_pinmux_table(const struct tegra_pingroup_config *config,
      int len)
{
      int i;
      struct tegra_pingroup_config c;

      for (i = 0; i < len; i++) {
            int err;
            c = config[i];
            if (c.pingroup < 0 || c.pingroup >= TEGRA_MAX_PINGROUP) {
                  WARN_ON(1);
                  continue;
            }
            c.func = pingroups[c.pingroup].func_safe;
            err = tegra_pinmux_set_func(&c);
            if (err < 0)
                  pr_err("%s: tegra_pinmux_set_func returned %d setting "
                         "%s to %s\n", __func__, err,
                         pingroup_name(c.pingroup), func_name(c.func));
      }
}

void tegra_pinmux_config_pinmux_table(const struct tegra_pingroup_config *config,
      int len)
{
      int i;

      for (i = 0; i < len; i++) {
            int err;
            if (config[i].pingroup < 0 ||
                config[i].pingroup >= TEGRA_MAX_PINGROUP) {
                  WARN_ON(1);
                  continue;
            }
            err = tegra_pinmux_set_func(&config[i]);
            if (err < 0)
                  pr_err("%s: tegra_pinmux_set_func returned %d setting "
                         "%s to %s\n", __func__, err,
                         pingroup_name(config[i].pingroup),
                         func_name(config[i].func));
      }
}

void tegra_pinmux_config_tristate_table(const struct tegra_pingroup_config *config,
      int len, enum tegra_tristate tristate)
{
      int i;
      int err;
      enum tegra_pingroup pingroup;

      for (i = 0; i < len; i++) {
            pingroup = config[i].pingroup;
            if (pingroups[pingroup].tri_reg >= 0) {
                  err = tegra_pinmux_set_tristate(pingroup, tristate);
                  if (err < 0)
                        pr_err("pinmux: can't set pingroup %s tristate"
                              " to %s: %d\n",   pingroup_name(pingroup),
                              tri_name(tristate), err);
            }
      }
}

void tegra_pinmux_config_pullupdown_table(const struct tegra_pingroup_config *config,
      int len, enum tegra_pullupdown pupd)
{
      int i;
      int err;
      enum tegra_pingroup pingroup;

      for (i = 0; i < len; i++) {
            pingroup = config[i].pingroup;
            if (pingroups[pingroup].pupd_reg >= 0) {
                  err = tegra_pinmux_set_pullupdown(pingroup, pupd);
                  if (err < 0)
                        pr_err("pinmux: can't set pingroup %s pullupdown"
                              " to %s: %d\n",   pingroup_name(pingroup),
                              pupd_name(pupd), err);
            }
      }
}

#ifdef      CONFIG_DEBUG_FS

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static void dbg_pad_field(struct seq_file *s, int len)
{
      seq_putc(s, ',');

      while (len-- > -1)
            seq_putc(s, ' ');
}

static int dbg_pinmux_show(struct seq_file *s, void *unused)
{
      int i;
      int len;

      for (i = 0; i < TEGRA_MAX_PINGROUP; i++) {
            unsigned long tri;
            unsigned long mux;
            unsigned long pupd;

            seq_printf(s, "\t{TEGRA_PINGROUP_%s", pingroups[i].name);
            len = strlen(pingroups[i].name);
            dbg_pad_field(s, 5 - len);

            if (pingroups[i].mux_reg < 0) {
                  seq_printf(s, "TEGRA_MUX_NONE");
                  len = strlen("NONE");
            } else {
                  mux = (pg_readl(pingroups[i].mux_reg) >>
                         pingroups[i].mux_bit) & 0x3;
                  if (pingroups[i].funcs[mux] == TEGRA_MUX_RSVD) {
                        seq_printf(s, "TEGRA_MUX_RSVD%1lu", mux+1);
                        len = 5;
                  } else {
                        seq_printf(s, "TEGRA_MUX_%s",
                                 tegra_mux_names[pingroups[i].funcs[mux]]);
                        len = strlen(tegra_mux_names[pingroups[i].funcs[mux]]);
                  }
            }
            dbg_pad_field(s, 13-len);

            if (pingroups[i].pupd_reg < 0) {
                  seq_printf(s, "TEGRA_PUPD_NORMAL");
                  len = strlen("NORMAL");
            } else {
                  pupd = (pg_readl(pingroups[i].pupd_reg) >>
                        pingroups[i].pupd_bit) & 0x3;
                  seq_printf(s, "TEGRA_PUPD_%s", pupd_name(pupd));
                  len = strlen(pupd_name(pupd));
            }
            dbg_pad_field(s, 9 - len);

            if (pingroups[i].tri_reg < 0) {
                  seq_printf(s, "TEGRA_TRI_NORMAL");
            } else {
                  tri = (pg_readl(pingroups[i].tri_reg) >>
                         pingroups[i].tri_bit) & 0x1;

                  seq_printf(s, "TEGRA_TRI_%s", tri_name(tri));
            }
            seq_printf(s, "},\n");
      }
      return 0;
}

static int dbg_pinmux_open(struct inode *inode, struct file *file)
{
      return single_open(file, dbg_pinmux_show, &inode->i_private);
}

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

static int dbg_drive_pinmux_show(struct seq_file *s, void *unused)
{
      int i;
      int len;

      for (i = 0; i < TEGRA_MAX_DRIVE_PINGROUP; i++) {
            u32 reg;

            seq_printf(s, "\t{TEGRA_DRIVE_PINGROUP_%s",
                  drive_pingroups[i].name);
            len = strlen(drive_pingroups[i].name);
            dbg_pad_field(s, 7 - len);


            reg = pg_readl(drive_pingroups[i].reg);
            if (HSM_EN(reg)) {
                  seq_printf(s, "TEGRA_HSM_ENABLE");
                  len = 16;
            } else {
                  seq_printf(s, "TEGRA_HSM_DISABLE");
                  len = 17;
            }
            dbg_pad_field(s, 17 - len);

            if (SCHMT_EN(reg)) {
                  seq_printf(s, "TEGRA_SCHMITT_ENABLE");
                  len = 21;
            } else {
                  seq_printf(s, "TEGRA_SCHMITT_DISABLE");
                  len = 22;
            }
            dbg_pad_field(s, 22 - len);

            seq_printf(s, "TEGRA_DRIVE_%s", drive_name(LPMD(reg)));
            len = strlen(drive_name(LPMD(reg)));
            dbg_pad_field(s, 5 - len);

            seq_printf(s, "TEGRA_PULL_%d", DRVDN(reg));
            len = DRVDN(reg) < 10 ? 1 : 2;
            dbg_pad_field(s, 2 - len);

            seq_printf(s, "TEGRA_PULL_%d", DRVUP(reg));
            len = DRVUP(reg) < 10 ? 1 : 2;
            dbg_pad_field(s, 2 - len);

            seq_printf(s, "TEGRA_SLEW_%s", slew_name(SLWR(reg)));
            len = strlen(slew_name(SLWR(reg)));
            dbg_pad_field(s, 7 - len);

            seq_printf(s, "TEGRA_SLEW_%s", slew_name(SLWF(reg)));

            seq_printf(s, "},\n");
      }
      return 0;
}

static int dbg_drive_pinmux_open(struct inode *inode, struct file *file)
{
      return single_open(file, dbg_drive_pinmux_show, &inode->i_private);
}

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

static int __init tegra_pinmux_debuginit(void)
{
      (void) debugfs_create_file("tegra_pinmux", S_IRUGO,
                              NULL, NULL, &debug_fops);
      (void) debugfs_create_file("tegra_pinmux_drive", S_IRUGO,
                              NULL, NULL, &debug_drive_fops);
      return 0;
}
late_initcall(tegra_pinmux_debuginit);
#endif

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