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ide_platform.c

/*
 * Platform IDE driver
 *
 * Copyright (C) 2007 MontaVista Software
 *
 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/pata_platform.h>
#include <linux/platform_device.h>
#include <linux/io.h>

static struct {
      void __iomem *plat_ide_mapbase;
      void __iomem *plat_ide_alt_mapbase;
      ide_hwif_t *hwif;
      int index;
} hwif_prop;

static ide_hwif_t *__devinit plat_ide_locate_hwif(void __iomem *base,
          void __iomem *ctrl, struct pata_platform_info *pdata, int irq,
          int mmio)
{
      unsigned long port = (unsigned long)base;
      ide_hwif_t *hwif = ide_find_port(port);
      int i;

      if (hwif == NULL)
            goto out;

      hwif->io_ports[IDE_DATA_OFFSET] = port;

      port += (1 << pdata->ioport_shift);
      for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET;
           i++, port += (1 << pdata->ioport_shift))
            hwif->io_ports[i] = port;

      hwif->io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl;

      hwif->irq = irq;

      hwif->chipset = ide_generic;

      if (mmio) {
            hwif->mmio = 1;
            default_hwif_mmiops(hwif);
      }

      hwif_prop.hwif = hwif;
      hwif_prop.index = hwif->index;
out:
      return hwif;
}

static int __devinit plat_ide_probe(struct platform_device *pdev)
{
      struct resource *res_base, *res_alt, *res_irq;
      ide_hwif_t *hwif;
      struct pata_platform_info *pdata;
      u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
      int ret = 0;
      int mmio = 0;

      pdata = pdev->dev.platform_data;

      /* get a pointer to the register memory */
      res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
      res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);

      if (!res_base || !res_alt) {
            res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
            res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
            if (!res_base || !res_alt) {
                  ret = -ENOMEM;
                  goto out;
            }
            mmio = 1;
      }

      res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
      if (!res_irq) {
            ret = -EINVAL;
            goto out;
      }

      if (mmio) {
            hwif_prop.plat_ide_mapbase = devm_ioremap(&pdev->dev,
                  res_base->start, res_base->end - res_base->start + 1);
            hwif_prop.plat_ide_alt_mapbase = devm_ioremap(&pdev->dev,
                  res_alt->start, res_alt->end - res_alt->start + 1);
      } else {
            hwif_prop.plat_ide_mapbase = devm_ioport_map(&pdev->dev,
                  res_base->start, res_base->end - res_base->start + 1);
            hwif_prop.plat_ide_alt_mapbase = devm_ioport_map(&pdev->dev,
                  res_alt->start, res_alt->end - res_alt->start + 1);
      }

      hwif = plat_ide_locate_hwif(hwif_prop.plat_ide_mapbase,
               hwif_prop.plat_ide_alt_mapbase, pdata, res_irq->start, mmio);

      if (!hwif) {
            ret = -ENODEV;
            goto out;
      }
      hwif->gendev.parent = &pdev->dev;
      hwif->noprobe = 0;

      idx[0] = hwif->index;

      ide_device_add(idx);

      platform_set_drvdata(pdev, hwif);

      return 0;

out:
      return ret;
}

static int __devexit plat_ide_remove(struct platform_device *pdev)
{
      ide_hwif_t *hwif = pdev->dev.driver_data;

      if (hwif != hwif_prop.hwif) {
            dev_printk(KERN_DEBUG, &pdev->dev, "%s: hwif value error",
                       pdev->name);
      } else {
            ide_unregister(hwif_prop.index);
            hwif_prop.index = 0;
            hwif_prop.hwif = NULL;
      }

      return 0;
}

static struct platform_driver platform_ide_driver = {
      .driver = {
            .name = "pata_platform",
      },
      .probe = plat_ide_probe,
      .remove = __devexit_p(plat_ide_remove),
};

static int __init platform_ide_init(void)
{
      return platform_driver_register(&platform_ide_driver);
}

static void __exit platform_ide_exit(void)
{
      platform_driver_unregister(&platform_ide_driver);
}

MODULE_DESCRIPTION("Platform IDE driver");
MODULE_LICENSE("GPL");

module_init(platform_ide_init);
module_exit(platform_ide_exit);

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