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
36 static 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
41 static struct scsi_host_template palmld_sht = {
42 ATA_PIO_SHT(DRV_NAME),
43 };
44
45 static 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
palmld_pata_probe(struct platform_device * pdev)51 static 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
106 err2:
107 gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
108 err1:
109 return ret;
110 }
111
palmld_pata_remove(struct platform_device * dev)112 static 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
124 static 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
132 module_platform_driver(palmld_pata_platform_driver);
133
134 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
135 MODULE_DESCRIPTION("PalmLD PATA driver");
136 MODULE_LICENSE("GPL");
137 MODULE_ALIAS("platform:" DRV_NAME);
138