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 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
80 static const struct of_device_id pata_of_platform_match[] = {
81 { .compatible = "ata-generic", },
82 { /* sentinel */ }
83 };
84 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
85
86 static 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 = ata_platform_remove_one,
93 };
94
95 module_platform_driver(pata_of_platform_driver);
96
97 MODULE_DESCRIPTION("OF-platform PATA driver");
98 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
99 MODULE_LICENSE("GPL");
100