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mfp-pxa2xx.c

/*
 *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
 *
 *  PXA2xx pin mux configuration support
 *
 *  The GPIOs on PXA2xx can be configured as one of many alternate
 *  functions, this is by concept samilar to the MFP configuration
 *  on PXA3xx,  what's more important, the low power pin state and
 *  wakeup detection are also supported by the same framework.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>

#include <mach/gpio.h>
#include <mach/pxa2xx-regs.h>
#include <mach/mfp-pxa2xx.h>

#include "generic.h"

#define PGSR(x)         __REG2(0x40F00020, (x) << 2)
#define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
#define GAFR_L(x) __GAFR(0, x)
#define GAFR_U(x) __GAFR(1, x)

#define PWER_WE35 (1 << 24)

00034 struct gpio_desc {
      unsigned    valid       : 1;
      unsigned    can_wakeup  : 1;
      unsigned    keypad_gpio : 1;
      unsigned    dir_inverted      : 1;
      unsigned int      mask; /* bit mask in PWER or PKWR */
      unsigned int      mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
      unsigned long     config;
};

static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];

static unsigned long gpdr_lpm[4];

static int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
      unsigned long gafr, mask = GPIO_bit(gpio);
      int bank = gpio_to_bank(gpio);
      int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
      int shft = (gpio & 0xf) << 1;
      int fn = MFP_AF(c);
      int is_out = (c & MFP_DIR_OUT) ? 1 : 0;

      if (fn > 3)
            return -EINVAL;

      /* alternate function and direction at run-time */
      gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
      gafr = (gafr & ~(0x3 << shft)) | (fn << shft);

      if (uorl == 0)
            GAFR_L(bank) = gafr;
      else
            GAFR_U(bank) = gafr;

      if (is_out ^ gpio_desc[gpio].dir_inverted)
            GPDR(gpio) |= mask;
      else
            GPDR(gpio) &= ~mask;

      /* alternate function and direction at low power mode */
      switch (c & MFP_LPM_STATE_MASK) {
      case MFP_LPM_DRIVE_HIGH:
            PGSR(bank) |= mask;
            is_out = 1;
            break;
      case MFP_LPM_DRIVE_LOW:
            PGSR(bank) &= ~mask;
            is_out = 1;
            break;
      case MFP_LPM_DEFAULT:
            break;
      default:
            /* warning and fall through, treat as MFP_LPM_DEFAULT */
            pr_warning("%s: GPIO%d: unsupported low power mode\n",
                        __func__, gpio);
            break;
      }

      if (is_out ^ gpio_desc[gpio].dir_inverted)
            gpdr_lpm[bank] |= mask;
      else
            gpdr_lpm[bank] &= ~mask;

      /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
       * configurations of those pins not able to wakeup
       */
      if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
            pr_warning("%s: GPIO%d unable to wakeup\n",
                        __func__, gpio);
            return -EINVAL;
      }

      if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
            pr_warning("%s: output GPIO%d unable to wakeup\n",
                        __func__, gpio);
            return -EINVAL;
      }

      return 0;
}

static inline int __mfp_validate(int mfp)
{
      int gpio = mfp_to_gpio(mfp);

      if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
            pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
            return -1;
      }

      return gpio;
}

void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
{
      unsigned long flags;
      unsigned long *c;
      int i, gpio;

      for (i = 0, c = mfp_cfgs; i < num; i++, c++) {

            gpio = __mfp_validate(MFP_PIN(*c));
            if (gpio < 0)
                  continue;

            local_irq_save(flags);

            gpio_desc[gpio].config = *c;
            __mfp_config_gpio(gpio, *c);

            local_irq_restore(flags);
      }
}

void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
{
      unsigned long flags, c;
      int gpio;

      gpio = __mfp_validate(mfp);
      if (gpio < 0)
            return;

      local_irq_save(flags);

      c = gpio_desc[gpio].config;
      c = (c & ~MFP_LPM_STATE_MASK) | lpm;
      __mfp_config_gpio(gpio, c);

      local_irq_restore(flags);
}

int gpio_set_wake(unsigned int gpio, unsigned int on)
{
      struct gpio_desc *d;
      unsigned long c, mux_taken;

      if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
            return -EINVAL;

      d = &gpio_desc[gpio];
      c = d->config;

      if (!d->valid)
            return -EINVAL;

      if (d->keypad_gpio)
            return -EINVAL;

      mux_taken = (PWER & d->mux_mask) & (~d->mask);
      if (on && mux_taken)
            return -EBUSY;

      if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
            if (on) {
                  PWER = (PWER & ~d->mux_mask) | d->mask;

                  if (c & MFP_LPM_EDGE_RISE)
                        PRER |= d->mask;
                  else
                        PRER &= ~d->mask;

                  if (c & MFP_LPM_EDGE_FALL)
                        PFER |= d->mask;
                  else
                        PFER &= ~d->mask;
            } else {
                  PWER &= ~d->mask;
                  PRER &= ~d->mask;
                  PFER &= ~d->mask;
            }
      }
      return 0;
}

#ifdef CONFIG_PXA25x
static void __init pxa25x_mfp_init(void)
{
      int i;

      for (i = 0; i <= pxa_last_gpio; i++)
            gpio_desc[i].valid = 1;

      for (i = 0; i <= 15; i++) {
            gpio_desc[i].can_wakeup = 1;
            gpio_desc[i].mask = GPIO_bit(i);
      }

      /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
       * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
       */
      for (i = 86; i <= pxa_last_gpio; i++)
            gpio_desc[i].dir_inverted = 1;
}
#else
static inline void pxa25x_mfp_init(void) {}
#endif /* CONFIG_PXA25x */

#ifdef CONFIG_PXA27x
static int pxa27x_pkwr_gpio[] = {
      13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
      95, 96, 97, 98, 99, 100, 101, 102
};

int keypad_set_wake(unsigned int on)
{
      unsigned int i, gpio, mask = 0;

      if (!on) {
            PKWR = 0;
            return 0;
      }

      for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {

            gpio = pxa27x_pkwr_gpio[i];

            if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
                  mask |= gpio_desc[gpio].mask;
      }

      PKWR = mask;
      return 0;
}

#define PWER_WEMUX2_GPIO38    (1 << 16)
#define PWER_WEMUX2_GPIO53    (2 << 16)
#define PWER_WEMUX2_GPIO40    (3 << 16)
#define PWER_WEMUX2_GPIO36    (4 << 16)
#define PWER_WEMUX2_MASK      (7 << 16)
#define PWER_WEMUX3_GPIO31    (1 << 19)
#define PWER_WEMUX3_GPIO113   (2 << 19)
#define PWER_WEMUX3_MASK      (3 << 19)

#define INIT_GPIO_DESC_MUXED(mux, gpio)                     \
do {                                            \
      gpio_desc[(gpio)].can_wakeup = 1;               \
      gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;      \
      gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;   \
} while (0)

static void __init pxa27x_mfp_init(void)
{
      int i, gpio;

      for (i = 0; i <= pxa_last_gpio; i++) {
            /* skip GPIO2, 5, 6, 7, 8, they are not
             * valid pins allow configuration
             */
            if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
                  continue;

            gpio_desc[i].valid = 1;
      }

      /* Keypad GPIOs */
      for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
            gpio = pxa27x_pkwr_gpio[i];
            gpio_desc[gpio].can_wakeup = 1;
            gpio_desc[gpio].keypad_gpio = 1;
            gpio_desc[gpio].mask = 1 << i;
      }

      /* Overwrite GPIO13 as a PWER wakeup source */
      for (i = 0; i <= 15; i++) {
            /* skip GPIO2, 5, 6, 7, 8 */
            if (GPIO_bit(i) & 0x1e4)
                  continue;

            gpio_desc[i].can_wakeup = 1;
            gpio_desc[i].mask = GPIO_bit(i);
      }

      gpio_desc[35].can_wakeup = 1;
      gpio_desc[35].mask = PWER_WE35;

      INIT_GPIO_DESC_MUXED(WEMUX3, 31);
      INIT_GPIO_DESC_MUXED(WEMUX3, 113);
      INIT_GPIO_DESC_MUXED(WEMUX2, 38);
      INIT_GPIO_DESC_MUXED(WEMUX2, 53);
      INIT_GPIO_DESC_MUXED(WEMUX2, 40);
      INIT_GPIO_DESC_MUXED(WEMUX2, 36);
}
#else
static inline void pxa27x_mfp_init(void) {}
#endif /* CONFIG_PXA27x */

#ifdef CONFIG_PM
static unsigned long saved_gafr[2][4];
static unsigned long saved_gpdr[4];
static unsigned long saved_pgsr[4];

static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
{
      int i;

      for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {

            saved_gafr[0][i] = GAFR_L(i);
            saved_gafr[1][i] = GAFR_U(i);
            saved_gpdr[i] = GPDR(i * 32);
            saved_pgsr[i] = PGSR(i);

            GPDR(i * 32) = gpdr_lpm[i];
      }
      return 0;
}

static int pxa2xx_mfp_resume(struct sys_device *d)
{
      int i;

      for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
            GAFR_L(i) = saved_gafr[0][i];
            GAFR_U(i) = saved_gafr[1][i];
            GPDR(i * 32) = saved_gpdr[i];
            PGSR(i) = saved_pgsr[i];
      }
      PSSR = PSSR_RDH | PSSR_PH;
      return 0;
}
#else
#define pxa2xx_mfp_suspend    NULL
#define pxa2xx_mfp_resume     NULL
#endif

struct sysdev_class pxa2xx_mfp_sysclass = {
      .name       = "mfp",
      .suspend    = pxa2xx_mfp_suspend,
      .resume           = pxa2xx_mfp_resume,
};

static int __init pxa2xx_mfp_init(void)
{
      int i;

      if (!cpu_is_pxa2xx())
            return 0;

      if (cpu_is_pxa25x())
            pxa25x_mfp_init();

      if (cpu_is_pxa27x())
            pxa27x_mfp_init();

      /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
      PSSR = PSSR_RDH;

      /* initialize gafr_run[], pgsr_lpm[] from existing values */
      for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
            gpdr_lpm[i] = GPDR(i * 32);

      return sysdev_class_register(&pxa2xx_mfp_sysclass);
}
postcore_initcall(pxa2xx_mfp_init);

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