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mpc52xx_gpio.c

/*
 * MPC52xx gpio driver
 *
 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * 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.
 *
 * 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/of.h>
#include <linux/kernel.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/of_platform.h>

#include <asm/gpio.h>
#include <asm/mpc52xx.h>
#include <sysdev/fsl_soc.h>

static DEFINE_SPINLOCK(gpio_lock);

00032 struct mpc52xx_gpiochip {
      struct of_mm_gpio_chip mmchip;
      unsigned int shadow_dvo;
      unsigned int shadow_gpioe;
      unsigned int shadow_ddr;
};

/*
 * GPIO LIB API implementation for wakeup GPIOs.
 *
 * There's a maximum of 8 wakeup GPIOs. Which of these are available
 * for use depends on your board setup.
 *
 * 0 -> GPIO_WKUP_7
 * 1 -> GPIO_WKUP_6
 * 2 -> PSC6_1
 * 3 -> PSC6_0
 * 4 -> ETH_17
 * 5 -> PSC3_9
 * 6 -> PSC2_4
 * 7 -> PSC1_4
 *
 */
static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
      unsigned int ret;

      ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;

      pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);

      return ret;
}

static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;

      if (val)
            chip->shadow_dvo |= 1 << (7 - gpio);
      else
            chip->shadow_dvo &= ~(1 << (7 - gpio));

      out_8(&regs->wkup_dvo, chip->shadow_dvo);
}

static void
mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      __mpc52xx_wkup_gpio_set(gc, gpio, val);

      spin_unlock_irqrestore(&gpio_lock, flags);

      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}

static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      /* set the direction */
      chip->shadow_ddr &= ~(1 << (7 - gpio));
      out_8(&regs->wkup_ddr, chip->shadow_ddr);

      /* and enable the pin */
      chip->shadow_gpioe |= 1 << (7 - gpio);
      out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

      spin_unlock_irqrestore(&gpio_lock, flags);

      return 0;
}

static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      __mpc52xx_wkup_gpio_set(gc, gpio, val);

      /* Then set direction */
      chip->shadow_ddr |= 1 << (7 - gpio);
      out_8(&regs->wkup_ddr, chip->shadow_ddr);

      /* Finally enable the pin */
      chip->shadow_gpioe |= 1 << (7 - gpio);
      out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

      spin_unlock_irqrestore(&gpio_lock, flags);

      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

      return 0;
}

static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
                              const struct of_device_id *match)
{
      struct mpc52xx_gpiochip *chip;
      struct mpc52xx_gpio_wkup __iomem *regs;
      struct of_gpio_chip *ofchip;
      int ret;

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (!chip)
            return -ENOMEM;

      ofchip = &chip->mmchip.of_gc;

      ofchip->gpio_cells          = 2;
      ofchip->gc.ngpio            = 8;
      ofchip->gc.direction_input  = mpc52xx_wkup_gpio_dir_in;
      ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
      ofchip->gc.get              = mpc52xx_wkup_gpio_get;
      ofchip->gc.set              = mpc52xx_wkup_gpio_set;

      ret = of_mm_gpiochip_add(ofdev->node, &chip->mmchip);
      if (ret)
            return ret;

      regs = chip->mmchip.regs;
      chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
      chip->shadow_ddr = in_8(&regs->wkup_ddr);
      chip->shadow_dvo = in_8(&regs->wkup_dvo);

      return 0;
}

static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
{
      return -EBUSY;
}

static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
      {
            .compatible = "fsl,mpc5200-gpio-wkup",
      },
      {}
};

static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
      .name = "gpio_wkup",
      .match_table = mpc52xx_wkup_gpiochip_match,
      .probe = mpc52xx_wkup_gpiochip_probe,
      .remove = mpc52xx_gpiochip_remove,
};

/*
 * GPIO LIB API implementation for simple GPIOs
 *
 * There's a maximum of 32 simple GPIOs. Which of these are available
 * for use depends on your board setup.
 * The numbering reflects the bit numbering in the port registers:
 *
 *  0..1  > reserved
 *  2..3  > IRDA
 *  4..7  > ETHR
 *  8..11 > reserved
 * 12..15 > USB
 * 16..17 > reserved
 * 18..23 > PSC3
 * 24..27 > PSC2
 * 28..31 > PSC1
 */
static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
      unsigned int ret;

      ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;

      return ret;
}

static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      struct mpc52xx_gpio __iomem *regs = mm_gc->regs;

      if (val)
            chip->shadow_dvo |= 1 << (31 - gpio);
      else
            chip->shadow_dvo &= ~(1 << (31 - gpio));
      out_be32(&regs->simple_dvo, chip->shadow_dvo);
}

static void
mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      __mpc52xx_simple_gpio_set(gc, gpio, val);

      spin_unlock_irqrestore(&gpio_lock, flags);

      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}

static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      /* set the direction */
      chip->shadow_ddr &= ~(1 << (31 - gpio));
      out_be32(&regs->simple_ddr, chip->shadow_ddr);

      /* and enable the pin */
      chip->shadow_gpioe |= 1 << (31 - gpio);
      out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

      spin_unlock_irqrestore(&gpio_lock, flags);

      return 0;
}

static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpiochip *chip = container_of(mm_gc,
                  struct mpc52xx_gpiochip, mmchip);
      struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
      unsigned long flags;

      spin_lock_irqsave(&gpio_lock, flags);

      /* First set initial value */
      __mpc52xx_simple_gpio_set(gc, gpio, val);

      /* Then set direction */
      chip->shadow_ddr |= 1 << (31 - gpio);
      out_be32(&regs->simple_ddr, chip->shadow_ddr);

      /* Finally enable the pin */
      chip->shadow_gpioe |= 1 << (31 - gpio);
      out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

      spin_unlock_irqrestore(&gpio_lock, flags);

      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

      return 0;
}

static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
                              const struct of_device_id *match)
{
      struct mpc52xx_gpiochip *chip;
      struct of_gpio_chip *ofchip;
      struct mpc52xx_gpio __iomem *regs;
      int ret;

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (!chip)
            return -ENOMEM;

      ofchip = &chip->mmchip.of_gc;

      ofchip->gpio_cells          = 2;
      ofchip->gc.ngpio            = 32;
      ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
      ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
      ofchip->gc.get              = mpc52xx_simple_gpio_get;
      ofchip->gc.set              = mpc52xx_simple_gpio_set;

      ret = of_mm_gpiochip_add(ofdev->node, &chip->mmchip);
      if (ret)
            return ret;

      regs = chip->mmchip.regs;
      chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
      chip->shadow_ddr = in_be32(&regs->simple_ddr);
      chip->shadow_dvo = in_be32(&regs->simple_dvo);

      return 0;
}

static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
      {
            .compatible = "fsl,mpc5200-gpio",
      },
      {}
};

static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
      .name = "gpio",
      .match_table = mpc52xx_simple_gpiochip_match,
      .probe = mpc52xx_simple_gpiochip_probe,
      .remove = mpc52xx_gpiochip_remove,
};

/*
 * GPIO LIB API implementation for gpt GPIOs.
 *
 * Each gpt only has a single GPIO.
 */
static int mpc52xx_gpt_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpt __iomem *regs = mm_gc->regs;
      unsigned int ret;

      return (in_be32(&regs->status) & (1 << (31 - 23))) ? 1 : 0;

      return ret;
}

static void
mpc52xx_gpt_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpt __iomem *regs = mm_gc->regs;

      if (val)
            out_be32(&regs->mode, 0x34);
      else
            out_be32(&regs->mode, 0x24);

      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}

static int mpc52xx_gpt_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
      struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
      struct mpc52xx_gpt __iomem *regs = mm_gc->regs;

      out_be32(&regs->mode, 0x04);

      return 0;
}

static int
mpc52xx_gpt_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
      mpc52xx_gpt_gpio_set(gc, gpio, val);
      pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

      return 0;
}

static int __devinit mpc52xx_gpt_gpiochip_probe(struct of_device *ofdev,
                              const struct of_device_id *match)
{
      struct of_mm_gpio_chip *mmchip;
      struct of_gpio_chip *chip;

      mmchip = kzalloc(sizeof(*mmchip), GFP_KERNEL);
      if (!mmchip)
            return -ENOMEM;

      chip = &mmchip->of_gc;

      chip->gpio_cells          = 2;
      chip->gc.ngpio            = 1;
      chip->gc.direction_input  = mpc52xx_gpt_gpio_dir_in;
      chip->gc.direction_output = mpc52xx_gpt_gpio_dir_out;
      chip->gc.get              = mpc52xx_gpt_gpio_get;
      chip->gc.set              = mpc52xx_gpt_gpio_set;

      return of_mm_gpiochip_add(ofdev->node, mmchip);
}

static const struct of_device_id mpc52xx_gpt_gpiochip_match[] = {
      {
            .compatible = "fsl,mpc5200-gpt-gpio",
      },
      {}
};

static struct of_platform_driver mpc52xx_gpt_gpiochip_driver = {
      .name = "gpio_gpt",
      .match_table = mpc52xx_gpt_gpiochip_match,
      .probe = mpc52xx_gpt_gpiochip_probe,
      .remove = mpc52xx_gpiochip_remove,
};

static int __init mpc52xx_gpio_init(void)
{
      if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
            printk(KERN_ERR "Unable to register wakeup GPIO driver\n");

      if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
            printk(KERN_ERR "Unable to register simple GPIO driver\n");

      if (of_register_platform_driver(&mpc52xx_gpt_gpiochip_driver))
            printk(KERN_ERR "Unable to register gpt GPIO driver\n");

      return 0;
}


/* Make sure we get initialised before anyone else tries to use us */
subsys_initcall(mpc52xx_gpio_init);

/* No exit call at the moment as we cannot unregister of gpio chips */

MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
MODULE_LICENSE("GPL v2");


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