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 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 int palmld_pata_remove(struct platform_device *dev)
113{
114	ata_platform_remove_one(dev);
115
116	/* power down the HDD */
117	gpio_set_value(GPIO_NR_PALMLD_IDE_PWEN, 0);
118
119	gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
120
121	return 0;
122}
123
124static struct platform_driver palmld_pata_platform_driver = {
125	.driver	 = {
126		.name   = DRV_NAME,
127	},
128	.probe		= palmld_pata_probe,
129	.remove		= palmld_pata_remove,
130};
131
132module_platform_driver(palmld_pata_platform_driver);
133
134MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
135MODULE_DESCRIPTION("PalmLD PATA driver");
136MODULE_LICENSE("GPL");
137MODULE_ALIAS("platform:" DRV_NAME);
138