ide_platform.c revision 2bfba3c444fe8b2ab1c38112a89d8f03b61136ca 
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/ata_platform.h>
21#include <linux/platform_device.h>
22#include <linux/io.h>
23
24static void __devinit plat_ide_setup_ports(hw_regs_t *hw,
25					   void __iomem *base,
26					   void __iomem *ctrl,
27					   struct pata_platform_info *pdata,
28					   int irq)
29{
30	unsigned long port = (unsigned long)base;
31	int i;
32
33	hw->io_ports.data_addr = port;
34
35	port += (1 << pdata->ioport_shift);
36	for (i = 1; i <= 7;
37	     i++, port += (1 << pdata->ioport_shift))
38		hw->io_ports_array[i] = port;
39
40	hw->io_ports.ctl_addr = (unsigned long)ctrl;
41
42	hw->irq = irq;
43
44	hw->chipset = ide_generic;
45}
46
47static const struct ide_port_info platform_ide_port_info = {
48	.host_flags		= IDE_HFLAG_NO_DMA,
49};
50
51static int __devinit plat_ide_probe(struct platform_device *pdev)
52{
53	struct resource *res_base, *res_alt, *res_irq;
54	void __iomem *base, *alt_base;
55	struct pata_platform_info *pdata;
56	struct ide_host *host;
57	int ret = 0, mmio = 0;
58	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
59	struct ide_port_info d = platform_ide_port_info;
60
61	pdata = pdev->dev.platform_data;
62
63	/* get a pointer to the register memory */
64	res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
65	res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
66
67	if (!res_base || !res_alt) {
68		res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
69		res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
70		if (!res_base || !res_alt) {
71			ret = -ENOMEM;
72			goto out;
73		}
74		mmio = 1;
75	}
76
77	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
78	if (!res_irq) {
79		ret = -EINVAL;
80		goto out;
81	}
82
83	if (mmio) {
84		base = devm_ioremap(&pdev->dev,
85			res_base->start, res_base->end - res_base->start + 1);
86		alt_base = devm_ioremap(&pdev->dev,
87			res_alt->start, res_alt->end - res_alt->start + 1);
88	} else {
89		base = devm_ioport_map(&pdev->dev,
90			res_base->start, res_base->end - res_base->start + 1);
91		alt_base = devm_ioport_map(&pdev->dev,
92			res_alt->start, res_alt->end - res_alt->start + 1);
93	}
94
95	memset(&hw, 0, sizeof(hw));
96	plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
97	hw.dev = &pdev->dev;
98
99	if (mmio)
100		d.host_flags |= IDE_HFLAG_MMIO;
101
102	ret = ide_host_add(&d, hws, &host);
103	if (ret)
104		goto out;
105
106	platform_set_drvdata(pdev, host);
107
108	return 0;
109
110out:
111	return ret;
112}
113
114static int __devexit plat_ide_remove(struct platform_device *pdev)
115{
116	struct ide_host *host = pdev->dev.driver_data;
117
118	ide_host_remove(host);
119
120	return 0;
121}
122
123static struct platform_driver platform_ide_driver = {
124	.driver = {
125		.name = "pata_platform",
126		.owner = THIS_MODULE,
127	},
128	.probe = plat_ide_probe,
129	.remove = __devexit_p(plat_ide_remove),
130};
131
132static int __init platform_ide_init(void)
133{
134	return platform_driver_register(&platform_ide_driver);
135}
136
137static void __exit platform_ide_exit(void)
138{
139	platform_driver_unregister(&platform_ide_driver);
140}
141
142MODULE_DESCRIPTION("Platform IDE driver");
143MODULE_LICENSE("GPL");
144MODULE_ALIAS("platform:pata_platform");
145
146module_init(platform_ide_init);
147module_exit(platform_ide_exit);
148