/drivers/ata/pata_palmld.c

  1/*
  2 * drivers/ata/pata_palmld.c
  3 *
  4 * Driver for IDE channel in Palm LifeDrive
  5 *
  6 * Based on research of:
  7 *		Alex Osborne <ato@meshy.org>
  8 *
  9 * Rewrite for mainline:
 10 *		Marek Vasut <marek.vasut@gmail.com>
 11 *
 12 * Rewritten version based on pata_ixp4xx_cf.c:
 13 * ixp4xx PATA/Compact Flash driver
 14 * Copyright (C) 2006-07 Tower Technologies
 15 * Author: Alessandro Zummo <a.zummo@towertech.it>
 16 *
 17 * This program is free software; you can redistribute it and/or modify
 18 * it under the terms of the GNU General Public License version 2 as
 19 * published by the Free Software Foundation.
 20 *
 21 */
 22
 23#include <linux/kernel.h>
 24#include <linux/module.h>
 25#include <linux/libata.h>
 26#include <linux/irq.h>
 27#include <linux/platform_device.h>
 28#include <linux/delay.h>
 29#include <linux/gpio.h>
 30
 31#include <scsi/scsi_host.h>
 32#include <mach/palmld.h>
 33
 34#define DRV_NAME "pata_palmld"
 35
 36static struct gpio palmld_hdd_gpios[] = {
 37	{ GPIO_NR_PALMLD_IDE_PWEN,	GPIOF_INIT_HIGH,	"HDD Power" },
 38	{ GPIO_NR_PALMLD_IDE_RESET,	GPIOF_INIT_LOW,		"HDD Reset" },
 39};
 40
 41static struct scsi_host_template palmld_sht = {
 42	ATA_PIO_SHT(DRV_NAME),
 43};
 44
 45static struct ata_port_operations palmld_port_ops = {
 46	.inherits		= &ata_sff_port_ops,
 47	.sff_data_xfer		= ata_sff_data_xfer_noirq,
 48	.cable_detect		= ata_cable_40wire,
 49};
 50
 51static __devinit int palmld_pata_probe(struct platform_device *pdev)
 52{
 53	struct ata_host *host;
 54	struct ata_port *ap;
 55	void __iomem *mem;
 56	int ret;
 57
 58	/* allocate host */
 59	host = ata_host_alloc(&pdev->dev, 1);
 60	if (!host) {
 61		ret = -ENOMEM;
 62		goto err1;
 63	}
 64
 65	/* remap drive's physical memory address */
 66	mem = devm_ioremap(&pdev->dev, PALMLD_IDE_PHYS, 0x1000);
 67	if (!mem) {
 68		ret = -ENOMEM;
 69		goto err1;
 70	}
 71
 72	/* request and activate power GPIO, IRQ GPIO */
 73	ret = gpio_request_array(palmld_hdd_gpios,
 74				ARRAY_SIZE(palmld_hdd_gpios));
 75	if (ret)
 76		goto err1;
 77
 78	/* reset the drive */
 79	gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 0);
 80	msleep(30);
 81	gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 1);
 82	msleep(30);
 83
 84	/* setup the ata port */
 85	ap = host->ports[0];
 86	ap->ops	= &palmld_port_ops;
 87	ap->pio_mask = ATA_PIO4;
 88	ap->flags |= ATA_FLAG_PIO_POLLING;
 89
 90	/* memory mapping voodoo */
 91	ap->ioaddr.cmd_addr = mem + 0x10;
 92	ap->ioaddr.altstatus_addr = mem + 0xe;
 93	ap->ioaddr.ctl_addr = mem + 0xe;
 94
 95	/* start the port */
 96	ata_sff_std_ports(&ap->ioaddr);
 97
 98	/* activate host */
 99	ret = ata_host_activate(host, 0, NULL, IRQF_TRIGGER_RISING,
100					&palmld_sht);
101	if (ret)
102		goto err2;
103
104	return ret;
105
106err2:
107	gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
108err1:
109	return ret;
110}
111
112static __devexit int palmld_pata_remove(struct platform_device *dev)
113{
114	struct ata_host *host = platform_get_drvdata(dev);
115
116	ata_host_detach(host);
117
118	/* power down the HDD */
119	gpio_set_value(GPIO_NR_PALMLD_IDE_PWEN, 0);
120
121	gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
122
123	return 0;
124}
125
126static struct platform_driver palmld_pata_platform_driver = {
127	.driver	 = {
128		.name   = DRV_NAME,
129		.owner  = THIS_MODULE,
130	},
131	.probe		= palmld_pata_probe,
132	.remove		= __devexit_p(palmld_pata_remove),
133};
134
135static int __init palmld_pata_init(void)
136{
137	return platform_driver_register(&palmld_pata_platform_driver);
138}
139
140static void __exit palmld_pata_exit(void)
141{
142	platform_driver_unregister(&palmld_pata_platform_driver);
143}
144
145MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
146MODULE_DESCRIPTION("PalmLD PATA driver");
147MODULE_LICENSE("GPL");
148MODULE_ALIAS("platform:" DRV_NAME);
149
150module_init(palmld_pata_init);
151module_exit(palmld_pata_exit);