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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 <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/mfp-pxa2xx.h>

#include "generic.h"

#define PGSR(x)         __REG2(0x40F00020, ((x) & 0x60) >> 3)

#define PWER_WE35 (1 << 24)

struct gpio_desc {
      unsigned    valid       : 1;
      unsigned    can_wakeup  : 1;
      unsigned    keypad_gpio : 1;
      unsigned int      mask; /* bit mask in PWER or PKWR */
      unsigned long     config;
};

static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];

static int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
      unsigned long gafr, mask = GPIO_bit(gpio);
      int fn;

      fn = MFP_AF(c);
      if (fn > 3)
            return -EINVAL;

      /* alternate function and direction */
      gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
      GAFR(gpio) = gafr |  (fn  << ((gpio & 0xf) * 2));

      if (c & MFP_DIR_OUT)
            GPDR(gpio) |= mask;
      else
            GPDR(gpio) &= ~mask;

      /* low power state */
      switch (c & MFP_LPM_STATE_MASK) {
      case MFP_LPM_DRIVE_HIGH:
            PGSR(gpio) |= mask;
            break;
      case MFP_LPM_DRIVE_LOW:
            PGSR(gpio) &= ~mask;
            break;
      case MFP_LPM_INPUT:
            break;
      default:
            pr_warning("%s: invalid low power state for GPIO%d\n",
                        __func__, gpio);
            return -EINVAL;
      }

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

      return 0;
}

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_to_gpio(MFP_PIN(*c));

            if (!gpio_desc[gpio].valid) {
                  pr_warning("%s: GPIO%d is invalid pin\n",
                        __func__, gpio);
                  continue;
            }

            local_irq_save(flags);

            gpio_desc[gpio].config = *c;
            __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;

      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;

      if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
            if (on) {
                  PWER |= 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 int __init pxa25x_mfp_init(void)
{
      int i;

      if (cpu_is_pxa25x()) {
            for (i = 0; i <= 84; 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);
            }
      }

      return 0;
}
postcore_initcall(pxa25x_mfp_init);
#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;
}

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

      if (cpu_is_pxa27x()) {
            for (i = 0; i <= 120; 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;
      }

      return 0;
}
postcore_initcall(pxa27x_mfp_init);
#endif /* CONFIG_PXA27x */

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