// SPDX-License-Identifier: GPL-2.0-only

  /*
   * 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>

   */
  
  #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/consumer.h>

  
  #include <scsi/scsi_host.h>
  #include <mach/palmld.h>
  
  #define DRV_NAME "pata_palmld"

  struct palmld_pata {
  	struct ata_host *host;
  	struct gpio_desc *power;
  	struct gpio_desc *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_xfer32,

  	.cable_detect		= ata_cable_40wire,
  };

  static int palmld_pata_probe(struct platform_device *pdev)

  {

  	struct palmld_pata *lda;

  	struct ata_port *ap;
  	void __iomem *mem;

  	struct device *dev = &pdev->dev;

  	int ret;

  	lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
  	if (!lda)
  		return -ENOMEM;

  	/* allocate host */

  	lda->host = ata_host_alloc(dev, 1);
  	if (!lda->host)

  		return -ENOMEM;

  
  	/* remap drive's physical memory address */

  	mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
  	if (!mem)
  		return -ENOMEM;
  
  	/* request and activate power and reset GPIOs */

  	lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
  	if (IS_ERR(lda->power))
  		return PTR_ERR(lda->power);
  	lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  	if (IS_ERR(lda->reset)) {
  		gpiod_set_value(lda->power, 0);
  		return PTR_ERR(lda->reset);

  	}

  	/* Assert reset to reset the drive */

  	gpiod_set_value(lda->reset, 1);

  	msleep(30);

  	gpiod_set_value(lda->reset, 0);

  	msleep(30);
  
  	/* setup the ata port */

  	ap = lda->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(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
  				&palmld_sht);

  	/* power down on failure */

  	if (ret) {
  		gpiod_set_value(lda->power, 0);
  		return ret;
  	}
  
  	platform_set_drvdata(pdev, lda);
  	return 0;

  }

  static int palmld_pata_remove(struct platform_device *pdev)

  {

  	struct palmld_pata *lda = platform_get_drvdata(pdev);
  
  	ata_platform_remove_one(pdev);

  
  	/* power down the HDD */

  	gpiod_set_value(lda->power, 0);

  
  	return 0;
  }
  
  static struct platform_driver palmld_pata_platform_driver = {
  	.driver	 = {
  		.name   = DRV_NAME,

  	},
  	.probe		= palmld_pata_probe,

  	.remove		= 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);