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scoop.c

/*
 * Support code for the SCOOP interface found on various Sharp PDAs
 *
 * Copyright (c) 2004 Richard Purdie
 *
 *    Based on code written by Sharp/Lineo for 2.4 kernels
 *
 * 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/device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/hardware/scoop.h>

/* PCMCIA to Scoop linkage

   There is no easy way to link multiple scoop devices into one
   single entity for the pxa2xx_pcmcia device so this structure
   is used which is setup by the platform code.

   This file is never modular so this symbol is always
   accessile to the board support files.
*/
struct scoop_pcmcia_config *platform_scoop_config;
EXPORT_SYMBOL(platform_scoop_config);

struct  scoop_dev {
      void __iomem *base;
      struct gpio_chip gpio;
      spinlock_t scoop_lock;
      unsigned short suspend_clr;
      unsigned short suspend_set;
      u32 scoop_gpwr;
};

void reset_scoop(struct device *dev)
{
      struct scoop_dev *sdev = dev_get_drvdata(dev);

      iowrite16(0x0100, sdev->base + SCOOP_MCR);  // 00
      iowrite16(0x0000, sdev->base + SCOOP_CDR);  // 04
      iowrite16(0x0000, sdev->base + SCOOP_CCR);  // 10
      iowrite16(0x0000, sdev->base + SCOOP_IMR);  // 18
      iowrite16(0x00FF, sdev->base + SCOOP_IRM);  // 14
      iowrite16(0x0000, sdev->base + SCOOP_ISR);  // 1C
      iowrite16(0x0000, sdev->base + SCOOP_IRM);
}

static void __scoop_gpio_set(struct scoop_dev *sdev,
                  unsigned offset, int value)
{
      unsigned short gpwr;

      gpwr = ioread16(sdev->base + SCOOP_GPWR);
      if (value)
            gpwr |= 1 << (offset + 1);
      else
            gpwr &= ~(1 << (offset + 1));
      iowrite16(gpwr, sdev->base + SCOOP_GPWR);
}

static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
      struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
      unsigned long flags;

      spin_lock_irqsave(&sdev->scoop_lock, flags);

      __scoop_gpio_set(sdev, offset, value);

      spin_unlock_irqrestore(&sdev->scoop_lock, flags);
}

static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
{
      struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);

      /* XXX: I'm usure,  but it seems so */
      return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
}

static int scoop_gpio_direction_input(struct gpio_chip *chip,
                  unsigned offset)
{
      struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
      unsigned long flags;
      unsigned short gpcr;

      spin_lock_irqsave(&sdev->scoop_lock, flags);

      gpcr = ioread16(sdev->base + SCOOP_GPCR);
      gpcr &= ~(1 << (offset + 1));
      iowrite16(gpcr, sdev->base + SCOOP_GPCR);

      spin_unlock_irqrestore(&sdev->scoop_lock, flags);

      return 0;
}

static int scoop_gpio_direction_output(struct gpio_chip *chip,
                  unsigned offset, int value)
{
      struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
      unsigned long flags;
      unsigned short gpcr;

      spin_lock_irqsave(&sdev->scoop_lock, flags);

      __scoop_gpio_set(sdev, offset, value);

      gpcr = ioread16(sdev->base + SCOOP_GPCR);
      gpcr |= 1 << (offset + 1);
      iowrite16(gpcr, sdev->base + SCOOP_GPCR);

      spin_unlock_irqrestore(&sdev->scoop_lock, flags);

      return 0;
}

unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
{
      unsigned short gpio_bit;
      unsigned long flag;
      struct scoop_dev *sdev = dev_get_drvdata(dev);

      spin_lock_irqsave(&sdev->scoop_lock, flag);
      gpio_bit = ioread16(sdev->base + SCOOP_GPWR) | bit;
      iowrite16(gpio_bit, sdev->base + SCOOP_GPWR);
      spin_unlock_irqrestore(&sdev->scoop_lock, flag);

      return gpio_bit;
}

unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
{
      unsigned short gpio_bit;
      unsigned long flag;
      struct scoop_dev *sdev = dev_get_drvdata(dev);

      spin_lock_irqsave(&sdev->scoop_lock, flag);
      gpio_bit = ioread16(sdev->base + SCOOP_GPWR) & ~bit;
      iowrite16(gpio_bit, sdev->base + SCOOP_GPWR);
      spin_unlock_irqrestore(&sdev->scoop_lock, flag);

      return gpio_bit;
}

EXPORT_SYMBOL(set_scoop_gpio);
EXPORT_SYMBOL(reset_scoop_gpio);

unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
{
      struct scoop_dev *sdev = dev_get_drvdata(dev);
      return ioread16(sdev->base + reg);
}

void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
{
      struct scoop_dev *sdev = dev_get_drvdata(dev);
      iowrite16(data, sdev->base + reg);
}

EXPORT_SYMBOL(reset_scoop);
EXPORT_SYMBOL(read_scoop_reg);
EXPORT_SYMBOL(write_scoop_reg);

static void check_scoop_reg(struct scoop_dev *sdev)
{
      unsigned short mcr;

      mcr = ioread16(sdev->base + SCOOP_MCR);
      if ((mcr & 0x100) == 0)
            iowrite16(0x0101, sdev->base + SCOOP_MCR);
}

#ifdef CONFIG_PM
static int scoop_suspend(struct platform_device *dev, pm_message_t state)
{
      struct scoop_dev *sdev = platform_get_drvdata(dev);

      check_scoop_reg(sdev);
      sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
      iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);

      return 0;
}

static int scoop_resume(struct platform_device *dev)
{
      struct scoop_dev *sdev = platform_get_drvdata(dev);

      check_scoop_reg(sdev);
      iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);

      return 0;
}
#else
#define scoop_suspend   NULL
#define scoop_resume    NULL
#endif

static int __devinit scoop_probe(struct platform_device *pdev)
{
      struct scoop_dev *devptr;
      struct scoop_config *inf;
      struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      int ret;
      int temp;

      if (!mem)
            return -EINVAL;

      devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
      if (!devptr)
            return -ENOMEM;

      spin_lock_init(&devptr->scoop_lock);

      inf = pdev->dev.platform_data;
      devptr->base = ioremap(mem->start, mem->end - mem->start + 1);

      if (!devptr->base) {
            ret = -ENOMEM;
            goto err_ioremap;
      }

      platform_set_drvdata(pdev, devptr);

      printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);

      iowrite16(0x0140, devptr->base + SCOOP_MCR);
      reset_scoop(&pdev->dev);
      iowrite16(0x0000, devptr->base + SCOOP_CPR);
      iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
      iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);

      devptr->suspend_clr = inf->suspend_clr;
      devptr->suspend_set = inf->suspend_set;

      devptr->gpio.base = -1;

      if (inf->gpio_base != 0) {
            devptr->gpio.label = dev_name(&pdev->dev);
            devptr->gpio.base = inf->gpio_base;
            devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
            devptr->gpio.set = scoop_gpio_set;
            devptr->gpio.get = scoop_gpio_get;
            devptr->gpio.direction_input = scoop_gpio_direction_input;
            devptr->gpio.direction_output = scoop_gpio_direction_output;

            ret = gpiochip_add(&devptr->gpio);
            if (ret)
                  goto err_gpio;
      }

      return 0;

      if (devptr->gpio.base != -1)
            temp = gpiochip_remove(&devptr->gpio);
err_gpio:
      platform_set_drvdata(pdev, NULL);
err_ioremap:
      iounmap(devptr->base);
      kfree(devptr);

      return ret;
}

static int __devexit scoop_remove(struct platform_device *pdev)
{
      struct scoop_dev *sdev = platform_get_drvdata(pdev);
      int ret;

      if (!sdev)
            return -EINVAL;

      if (sdev->gpio.base != -1) {
            ret = gpiochip_remove(&sdev->gpio);
            if (ret) {
                  dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret);
                  return ret;
            }
      }

      platform_set_drvdata(pdev, NULL);
      iounmap(sdev->base);
      kfree(sdev);

      return 0;
}

static struct platform_driver scoop_driver = {
      .probe            = scoop_probe,
      .remove           = __devexit_p(scoop_remove),
      .suspend    = scoop_suspend,
      .resume           = scoop_resume,
      .driver           = {
            .name = "sharp-scoop",
      },
};

static int __init scoop_init(void)
{
      return platform_driver_register(&scoop_driver);
}

subsys_initcall(scoop_init);

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