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
18 static struct scsi_host_template pata_platform_sht = {
19 ATA_PIO_SHT(DRV_NAME),
20 };
21
pata_of_platform_probe(struct platform_device * ofdev)22 static 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
34 ret = of_address_to_resource(dn, 0, &io_res);
35 if (ret) {
36 dev_err(&ofdev->dev, "can't get IO address from "
37 "device tree\n");
38 return -EINVAL;
39 }
40
41 ret = of_address_to_resource(dn, 1, &ctl_res);
42 if (ret) {
43 dev_err(&ofdev->dev, "can't get CTL address from "
44 "device tree\n");
45 return -EINVAL;
46 }
47
48 irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
49
50 of_property_read_u32(dn, "reg-shift", ®_shift);
51
52 if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
53 if (pio_mode > 6) {
54 dev_err(&ofdev->dev, "invalid pio-mode\n");
55 return -EINVAL;
56 }
57 } else {
58 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
59 }
60
61 use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
62
63 pio_mask = 1 << pio_mode;
64 pio_mask |= (1 << pio_mode) - 1;
65
66 return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
67 reg_shift, pio_mask, &pata_platform_sht,
68 use16bit);
69 }
70
71 static const struct of_device_id pata_of_platform_match[] = {
72 { .compatible = "ata-generic", },
73 { },
74 };
75 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
76
77 static struct platform_driver pata_of_platform_driver = {
78 .driver = {
79 .name = DRV_NAME,
80 .of_match_table = pata_of_platform_match,
81 },
82 .probe = pata_of_platform_probe,
83 .remove = ata_platform_remove_one,
84 };
85
86 module_platform_driver(pata_of_platform_driver);
87
88 MODULE_DESCRIPTION("OF-platform PATA driver");
89 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
90 MODULE_LICENSE("GPL");
91