Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 2448441571ed64fb5d031edf1bab5d5a995c816c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// 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);