/*
   * drivers/ata/pata_palmld.c
   *
   * Driver for IDE channel in Palm LifeDrive
   *
   * Based on research of:
   *		Alex Osborne <ato@meshy.org>
   *
   * Rewrite for mainline:
   *		Marek Vasut <marek.vasut@gmail.com>
   *
   * Rewritten version based on pata_ixp4xx_cf.c:
   * ixp4xx PATA/Compact Flash driver
   * Copyright (C) 2006-07 Tower Technologies
   * Author: Alessandro Zummo <a.zummo@towertech.it>
   *
   * 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/kernel.h>
  #include <linux/module.h>
  #include <linux/libata.h>
  #include <linux/irq.h>
  #include <linux/platform_device.h>
  #include <linux/delay.h>
  #include <linux/gpio.h>
  
  #include <scsi/scsi_host.h>
  #include <mach/palmld.h>
  
  #define DRV_NAME "pata_palmld"

  static struct gpio palmld_hdd_gpios[] = {
  	{ GPIO_NR_PALMLD_IDE_PWEN,	GPIOF_INIT_HIGH,	"HDD Power" },
  	{ GPIO_NR_PALMLD_IDE_RESET,	GPIOF_INIT_LOW,		"HDD Reset" },
  };

  static struct scsi_host_template palmld_sht = {
  	ATA_PIO_SHT(DRV_NAME),
  };
  
  static struct ata_port_operations palmld_port_ops = {
  	.inherits		= &ata_sff_port_ops,
  	.sff_data_xfer		= ata_sff_data_xfer_noirq,
  	.cable_detect		= ata_cable_40wire,
  };
  
  static __devinit int palmld_pata_probe(struct platform_device *pdev)
  {
  	struct ata_host *host;
  	struct ata_port *ap;
  	void __iomem *mem;
  	int ret;
  
  	/* allocate host */
  	host = ata_host_alloc(&pdev->dev, 1);

  	if (!host) {
  		ret = -ENOMEM;
  		goto err1;
  	}

  
  	/* remap drive's physical memory address */
  	mem = devm_ioremap(&pdev->dev, PALMLD_IDE_PHYS, 0x1000);

  	if (!mem) {
  		ret = -ENOMEM;
  		goto err1;
  	}

  
  	/* request and activate power GPIO, IRQ GPIO */

  	ret = gpio_request_array(palmld_hdd_gpios,
  				ARRAY_SIZE(palmld_hdd_gpios));

  	if (ret)
  		goto err1;

  
  	/* reset the drive */
  	gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 0);
  	msleep(30);
  	gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 1);
  	msleep(30);
  
  	/* setup the ata port */
  	ap = host->ports[0];
  	ap->ops	= &palmld_port_ops;
  	ap->pio_mask = ATA_PIO4;

  	ap->flags |= ATA_FLAG_PIO_POLLING;

  
  	/* memory mapping voodoo */
  	ap->ioaddr.cmd_addr = mem + 0x10;
  	ap->ioaddr.altstatus_addr = mem + 0xe;
  	ap->ioaddr.ctl_addr = mem + 0xe;
  
  	/* start the port */
  	ata_sff_std_ports(&ap->ioaddr);
  
  	/* activate host */

  	ret = ata_host_activate(host, 0, NULL, IRQF_TRIGGER_RISING,

  					&palmld_sht);

  	if (ret)
  		goto err2;
  
  	return ret;

  err2:

  	gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));

  err1:
  	return ret;
  }
  
  static __devexit int palmld_pata_remove(struct platform_device *dev)
  {
  	struct ata_host *host = platform_get_drvdata(dev);
  
  	ata_host_detach(host);
  
  	/* power down the HDD */
  	gpio_set_value(GPIO_NR_PALMLD_IDE_PWEN, 0);

  	gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));

  
  	return 0;
  }
  
  static struct platform_driver palmld_pata_platform_driver = {
  	.driver	 = {
  		.name   = DRV_NAME,
  		.owner  = THIS_MODULE,
  	},
  	.probe		= palmld_pata_probe,
  	.remove		= __devexit_p(palmld_pata_remove),
  };

  module_platform_driver(palmld_pata_platform_driver);

  
  MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  MODULE_DESCRIPTION("PalmLD PATA driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:" DRV_NAME);