1/*
2 * OF-platform PATA driver
3 *
4 * Copyright (c) 2007 MontaVista Software, Inc.
5 * Anton Vorontsov <avorontsov@ru.mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of_address.h>
15#include <linux/platform_device.h>
16#include <linux/ata_platform.h>
17#include <linux/libata.h>
18
19#define DRV_NAME "pata_of_platform"
20
21static struct scsi_host_template pata_platform_sht = {
22 ATA_PIO_SHT(DRV_NAME),
23};
24
25static int pata_of_platform_probe(struct platform_device *ofdev)
26{
27 int ret;
28 struct device_node *dn = ofdev->dev.of_node;
29 struct resource io_res;
30 struct resource ctl_res;
31 struct resource *irq_res;
32 unsigned int reg_shift = 0;
33 int pio_mode = 0;
34 int pio_mask;
35 bool use16bit;
36
37 ret = of_address_to_resource(dn, 0, &io_res);
38 if (ret) {
39 dev_err(&ofdev->dev, "can't get IO address from "
40 "device tree\n");
41 return -EINVAL;
42 }
43
44 ret = of_address_to_resource(dn, 1, &ctl_res);
45 if (ret) {
46 dev_err(&ofdev->dev, "can't get CTL address from "
47 "device tree\n");
48 return -EINVAL;
49 }
50
51 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
52
53 of_property_read_u32(dn, "reg-shift", &reg_shift);
54
55 if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
56 if (pio_mode > 6) {
57 dev_err(&ofdev->dev, "invalid pio-mode\n");
58 return -EINVAL;
59 }
60 } else {
61 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
62 }
63
64 use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
65
66 pio_mask = 1 << pio_mode;
67 pio_mask |= (1 << pio_mode) - 1;
68
69 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
70 reg_shift, pio_mask, &pata_platform_sht,
71 use16bit);
72}
73
74static const struct of_device_id pata_of_platform_match[] = {
75 { .compatible = "ata-generic", },
76 { },
77};
78MODULE_DEVICE_TABLE(of, pata_of_platform_match);
79
80static struct platform_driver pata_of_platform_driver = {
81 .driver = {
82 .name = DRV_NAME,
83 .of_match_table = pata_of_platform_match,
84 },
85 .probe = pata_of_platform_probe,
86 .remove = ata_platform_remove_one,
87};
88
89module_platform_driver(pata_of_platform_driver);
90
91MODULE_DESCRIPTION("OF-platform PATA driver");
92MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
93MODULE_LICENSE("GPL");
94