tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Platform IDE driver
3 *
4 * Copyright (C) 2007 MontaVista Software
5 *
6 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/types.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/ide.h>
18#include <linux/ioport.h>
19#include <linux/module.h>
20#include <linux/pata_platform.h>
21#include <linux/platform_device.h>
22#include <linux/io.h>
23
24static struct {
25 void __iomem *plat_ide_mapbase;
26 void __iomem *plat_ide_alt_mapbase;
27 ide_hwif_t *hwif;
28 int index;
29} hwif_prop;
30
31static ide_hwif_t *__devinit plat_ide_locate_hwif(void __iomem *base,
32 void __iomem *ctrl, struct pata_platform_info *pdata, int irq,
33 int mmio)
34{
35 unsigned long port = (unsigned long)base;
36 ide_hwif_t *hwif = ide_find_port(port);
37 int i;
38
39 if (hwif == NULL)
40 goto out;
41
42 hwif->io_ports[IDE_DATA_OFFSET] = port;
43
44 port += (1 << pdata->ioport_shift);
45 for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET;
46 i++, port += (1 << pdata->ioport_shift))
47 hwif->io_ports[i] = port;
48
49 hwif->io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl;
50
51 hwif->irq = irq;
52
53 hwif->chipset = ide_generic;
54
55 if (mmio) {
56 hwif->mmio = 1;
57 default_hwif_mmiops(hwif);
58 }
59
60 hwif_prop.hwif = hwif;
61 hwif_prop.index = hwif->index;
62out:
63 return hwif;
64}
65
66static int __devinit plat_ide_probe(struct platform_device *pdev)
67{
68 struct resource *res_base, *res_alt, *res_irq;
69 ide_hwif_t *hwif;
70 struct pata_platform_info *pdata;
71 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
72 int ret = 0;
73 int mmio = 0;
74
75 pdata = pdev->dev.platform_data;
76
77 /* get a pointer to the register memory */
78 res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
79 res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
80
81 if (!res_base || !res_alt) {
82 res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
83 res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
84 if (!res_base || !res_alt) {
85 ret = -ENOMEM;
86 goto out;
87 }
88 mmio = 1;
89 }
90
91 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
92 if (!res_irq) {
93 ret = -EINVAL;
94 goto out;
95 }
96
97 if (mmio) {
98 hwif_prop.plat_ide_mapbase = devm_ioremap(&pdev->dev,
99 res_base->start, res_base->end - res_base->start + 1);
100 hwif_prop.plat_ide_alt_mapbase = devm_ioremap(&pdev->dev,
101 res_alt->start, res_alt->end - res_alt->start + 1);
102 } else {
103 hwif_prop.plat_ide_mapbase = devm_ioport_map(&pdev->dev,
104 res_base->start, res_base->end - res_base->start + 1);
105 hwif_prop.plat_ide_alt_mapbase = devm_ioport_map(&pdev->dev,
106 res_alt->start, res_alt->end - res_alt->start + 1);
107 }
108
109 hwif = plat_ide_locate_hwif(hwif_prop.plat_ide_mapbase,
110 hwif_prop.plat_ide_alt_mapbase, pdata, res_irq->start, mmio);
111
112 if (!hwif) {
113 ret = -ENODEV;
114 goto out;
115 }
116 hwif->gendev.parent = &pdev->dev;
117 hwif->noprobe = 0;
118
119 idx[0] = hwif->index;
120
121 ide_device_add(idx);
122
123 platform_set_drvdata(pdev, hwif);
124
125 return 0;
126
127out:
128 return ret;
129}
130
131static int __devexit plat_ide_remove(struct platform_device *pdev)
132{
133 ide_hwif_t *hwif = pdev->dev.driver_data;
134
135 if (hwif != hwif_prop.hwif) {
136 dev_printk(KERN_DEBUG, &pdev->dev, "%s: hwif value error",
137 pdev->name);
138 } else {
139 ide_unregister(hwif_prop.index);
140 hwif_prop.index = 0;
141 hwif_prop.hwif = NULL;
142 }
143
144 return 0;
145}
146
147static struct platform_driver platform_ide_driver = {
148 .driver = {
149 .name = "pata_platform",
150 },
151 .probe = plat_ide_probe,
152 .remove = __devexit_p(plat_ide_remove),
153};
154
155static int __init platform_ide_init(void)
156{
157 return platform_driver_register(&platform_ide_driver);
158}
159
160static void __exit platform_ide_exit(void)
161{
162 platform_driver_unregister(&platform_ide_driver);
163}
164
165MODULE_DESCRIPTION("Platform IDE driver");
166MODULE_LICENSE("GPL");
167
168module_init(platform_ide_init);
169module_exit(platform_ide_exit);