tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/consumer.h>
30
31#include <scsi/scsi_host.h>
32#include <mach/palmld.h>
33
34#define DRV_NAME "pata_palmld"
35
36struct palmld_pata {
37 struct ata_host *host;
38 struct gpio_desc *power;
39 struct gpio_desc *reset;
40};
41
42static struct scsi_host_template palmld_sht = {
43 ATA_PIO_SHT(DRV_NAME),
44};
45
46static struct ata_port_operations palmld_port_ops = {
47 .inherits = &ata_sff_port_ops,
48 .sff_data_xfer = ata_sff_data_xfer32,
49 .cable_detect = ata_cable_40wire,
50};
51
52static int palmld_pata_probe(struct platform_device *pdev)
53{
54 struct palmld_pata *lda;
55 struct ata_port *ap;
56 void __iomem *mem;
57 struct device *dev = &pdev->dev;
58 int ret;
59
60 lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
61 if (!lda)
62 return -ENOMEM;
63
64 /* allocate host */
65 lda->host = ata_host_alloc(dev, 1);
66 if (!lda->host)
67 return -ENOMEM;
68
69 /* remap drive's physical memory address */
70 mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
71 if (!mem)
72 return -ENOMEM;
73
74 /* request and activate power and reset GPIOs */
75 lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
76 if (IS_ERR(lda->power))
77 return PTR_ERR(lda->power);
78 lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
79 if (IS_ERR(lda->reset)) {
80 gpiod_set_value(lda->power, 0);
81 return PTR_ERR(lda->reset);
82 }
83
84 /* Assert reset to reset the drive */
85 gpiod_set_value(lda->reset, 1);
86 msleep(30);
87 gpiod_set_value(lda->reset, 0);
88 msleep(30);
89
90 /* setup the ata port */
91 ap = lda->host->ports[0];
92 ap->ops = &palmld_port_ops;
93 ap->pio_mask = ATA_PIO4;
94 ap->flags |= ATA_FLAG_PIO_POLLING;
95
96 /* memory mapping voodoo */
97 ap->ioaddr.cmd_addr = mem + 0x10;
98 ap->ioaddr.altstatus_addr = mem + 0xe;
99 ap->ioaddr.ctl_addr = mem + 0xe;
100
101 /* start the port */
102 ata_sff_std_ports(&ap->ioaddr);
103
104 /* activate host */
105 ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
106 &palmld_sht);
107 /* power down on failure */
108 if (ret) {
109 gpiod_set_value(lda->power, 0);
110 return ret;
111 }
112
113 platform_set_drvdata(pdev, lda);
114 return 0;
115}
116
117static int palmld_pata_remove(struct platform_device *pdev)
118{
119 struct palmld_pata *lda = platform_get_drvdata(pdev);
120
121 ata_platform_remove_one(pdev);
122
123 /* power down the HDD */
124 gpiod_set_value(lda->power, 0);
125
126 return 0;
127}
128
129static struct platform_driver palmld_pata_platform_driver = {
130 .driver = {
131 .name = DRV_NAME,
132 },
133 .probe = palmld_pata_probe,
134 .remove = palmld_pata_remove,
135};
136
137module_platform_driver(palmld_pata_platform_driver);
138
139MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
140MODULE_DESCRIPTION("PalmLD PATA driver");
141MODULE_LICENSE("GPL");
142MODULE_ALIAS("platform:" DRV_NAME);