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(dev: dn, index: 0, r: &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(dev: dn, index: 1, r: &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(np: dn, propname: "reg-shift", out_value: &reg_shift);
60
61 if (!of_property_read_u32(np: dn, propname: "pio-mode", out_value: &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(np: dn, propname: "ata-generic,use16bit");
71
72 pio_mask = 1 << pio_mode;
73 pio_mask |= (1 << pio_mode) - 1;
74
75 return __pata_platform_probe(dev: &ofdev->dev, io_res: &io_res, ctl_res: &ctl_res, irq_res: irq > 0 ? &irq_res : NULL,
76 ioport_shift: reg_shift, pio_mask: pio_mask, sht: &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");
100

source code of linux/drivers/ata/pata_of_platform.c