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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OF-platform PATA driver
4 *
5 * Copyright (c) 2007 MontaVista Software, Inc.
6 * Anton Vorontsov <avorontsov@ru.mvista.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/of_address.h>
12#include <linux/platform_device.h>
13#include <linux/ata_platform.h>
14#include <linux/libata.h>
15
16#define DRV_NAME "pata_of_platform"
17
18static const struct scsi_host_template pata_platform_sht = {
19 ATA_PIO_SHT(DRV_NAME),
20};
21
22static int pata_of_platform_probe(struct platform_device *ofdev)
23{
24 int ret;
25 struct device_node *dn = ofdev->dev.of_node;
26 struct resource io_res;
27 struct resource ctl_res;
28 struct resource irq_res;
29 unsigned int reg_shift = 0;
30 int pio_mode = 0;
31 int pio_mask;
32 bool use16bit;
33 int irq;
34
35 ret = of_address_to_resource(dn, 0, &io_res);
36 if (ret) {
37 dev_err(&ofdev->dev, "can't get IO address from "
38 "device tree\n");
39 return -EINVAL;
40 }
41
42 ret = of_address_to_resource(dn, 1, &ctl_res);
43 if (ret) {
44 dev_err(&ofdev->dev, "can't get CTL address from "
45 "device tree\n");
46 return -EINVAL;
47 }
48
49 memset(&irq_res, 0, sizeof(irq_res));
50
51 irq = platform_get_irq_optional(ofdev, 0);
52 if (irq < 0 && irq != -ENXIO)
53 return irq;
54 if (irq > 0) {
55 irq_res.start = irq;
56 irq_res.end = irq;
57 }
58
59 of_property_read_u32(dn, "reg-shift", ®_shift);
60
61 if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
62 if (pio_mode > 6) {
63 dev_err(&ofdev->dev, "invalid pio-mode\n");
64 return -EINVAL;
65 }
66 } else {
67 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
68 }
69
70 use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
71
72 pio_mask = 1 << pio_mode;
73 pio_mask |= (1 << pio_mode) - 1;
74
75 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL,
76 reg_shift, pio_mask, &pata_platform_sht,
77 use16bit);
78}
79
80static const struct of_device_id pata_of_platform_match[] = {
81 { .compatible = "ata-generic", },
82 { /* sentinel */ }
83};
84MODULE_DEVICE_TABLE(of, pata_of_platform_match);
85
86static struct platform_driver pata_of_platform_driver = {
87 .driver = {
88 .name = DRV_NAME,
89 .of_match_table = pata_of_platform_match,
90 },
91 .probe = pata_of_platform_probe,
92 .remove_new = ata_platform_remove_one,
93};
94
95module_platform_driver(pata_of_platform_driver);
96
97MODULE_DESCRIPTION("OF-platform PATA driver");
98MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
99MODULE_LICENSE("GPL");
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_platform.h>
15#include <linux/ata_platform.h>
16
17static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
18{
19 int ret;
20 struct device_node *dn = ofdev->dev.of_node;
21 struct resource io_res;
22 struct resource ctl_res;
23 struct resource irq_res;
24 unsigned int reg_shift = 0;
25 int pio_mode = 0;
26 int pio_mask;
27 const u32 *prop;
28
29 ret = of_address_to_resource(dn, 0, &io_res);
30 if (ret) {
31 dev_err(&ofdev->dev, "can't get IO address from "
32 "device tree\n");
33 return -EINVAL;
34 }
35
36 if (of_device_is_compatible(dn, "electra-ide")) {
37 /* Altstatus is really at offset 0x3f6 from the primary window
38 * on electra-ide. Adjust ctl_res and io_res accordingly.
39 */
40 ctl_res = io_res;
41 ctl_res.start = ctl_res.start+0x3f6;
42 io_res.end = ctl_res.start-1;
43 } else {
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
52 ret = of_irq_to_resource(dn, 0, &irq_res);
53 if (ret == NO_IRQ)
54 irq_res.start = irq_res.end = 0;
55 else
56 irq_res.flags = 0;
57
58 prop = of_get_property(dn, "reg-shift", NULL);
59 if (prop)
60 reg_shift = *prop;
61
62 prop = of_get_property(dn, "pio-mode", NULL);
63 if (prop) {
64 pio_mode = *prop;
65 if (pio_mode > 6) {
66 dev_err(&ofdev->dev, "invalid pio-mode\n");
67 return -EINVAL;
68 }
69 } else {
70 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
71 }
72
73 pio_mask = 1 << pio_mode;
74 pio_mask |= (1 << pio_mode) - 1;
75
76 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
77 reg_shift, pio_mask);
78}
79
80static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
81{
82 return __pata_platform_remove(&ofdev->dev);
83}
84
85static struct of_device_id pata_of_platform_match[] = {
86 { .compatible = "ata-generic", },
87 { .compatible = "electra-ide", },
88 {},
89};
90MODULE_DEVICE_TABLE(of, pata_of_platform_match);
91
92static struct platform_driver pata_of_platform_driver = {
93 .driver = {
94 .name = "pata_of_platform",
95 .owner = THIS_MODULE,
96 .of_match_table = pata_of_platform_match,
97 },
98 .probe = pata_of_platform_probe,
99 .remove = __devexit_p(pata_of_platform_remove),
100};
101
102static int __init pata_of_platform_init(void)
103{
104 return platform_driver_register(&pata_of_platform_driver);
105}
106module_init(pata_of_platform_init);
107
108static void __exit pata_of_platform_exit(void)
109{
110 platform_driver_unregister(&pata_of_platform_driver);
111}
112module_exit(pata_of_platform_exit);
113
114MODULE_DESCRIPTION("OF-platform PATA driver");
115MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
116MODULE_LICENSE("GPL");