1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * OF-platform PATA driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2007 MontaVista Software, Inc.
6*4882a593Smuzhiyun * Anton Vorontsov <avorontsov@ru.mvista.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/of_address.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <linux/ata_platform.h>
14*4882a593Smuzhiyun #include <linux/libata.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define DRV_NAME "pata_of_platform"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static struct scsi_host_template pata_platform_sht = {
19*4882a593Smuzhiyun ATA_PIO_SHT(DRV_NAME),
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
pata_of_platform_probe(struct platform_device * ofdev)22*4882a593Smuzhiyun static int pata_of_platform_probe(struct platform_device *ofdev)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun int ret;
25*4882a593Smuzhiyun struct device_node *dn = ofdev->dev.of_node;
26*4882a593Smuzhiyun struct resource io_res;
27*4882a593Smuzhiyun struct resource ctl_res;
28*4882a593Smuzhiyun struct resource *irq_res;
29*4882a593Smuzhiyun unsigned int reg_shift = 0;
30*4882a593Smuzhiyun int pio_mode = 0;
31*4882a593Smuzhiyun int pio_mask;
32*4882a593Smuzhiyun bool use16bit;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun ret = of_address_to_resource(dn, 0, &io_res);
35*4882a593Smuzhiyun if (ret) {
36*4882a593Smuzhiyun dev_err(&ofdev->dev, "can't get IO address from "
37*4882a593Smuzhiyun "device tree\n");
38*4882a593Smuzhiyun return -EINVAL;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun ret = of_address_to_resource(dn, 1, &ctl_res);
42*4882a593Smuzhiyun if (ret) {
43*4882a593Smuzhiyun dev_err(&ofdev->dev, "can't get CTL address from "
44*4882a593Smuzhiyun "device tree\n");
45*4882a593Smuzhiyun return -EINVAL;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun of_property_read_u32(dn, "reg-shift", ®_shift);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
53*4882a593Smuzhiyun if (pio_mode > 6) {
54*4882a593Smuzhiyun dev_err(&ofdev->dev, "invalid pio-mode\n");
55*4882a593Smuzhiyun return -EINVAL;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun } else {
58*4882a593Smuzhiyun dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun pio_mask = 1 << pio_mode;
64*4882a593Smuzhiyun pio_mask |= (1 << pio_mode) - 1;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
67*4882a593Smuzhiyun reg_shift, pio_mask, &pata_platform_sht,
68*4882a593Smuzhiyun use16bit);
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun static const struct of_device_id pata_of_platform_match[] = {
72*4882a593Smuzhiyun { .compatible = "ata-generic", },
73*4882a593Smuzhiyun { },
74*4882a593Smuzhiyun };
75*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, pata_of_platform_match);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun static struct platform_driver pata_of_platform_driver = {
78*4882a593Smuzhiyun .driver = {
79*4882a593Smuzhiyun .name = DRV_NAME,
80*4882a593Smuzhiyun .of_match_table = pata_of_platform_match,
81*4882a593Smuzhiyun },
82*4882a593Smuzhiyun .probe = pata_of_platform_probe,
83*4882a593Smuzhiyun .remove = ata_platform_remove_one,
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun module_platform_driver(pata_of_platform_driver);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun MODULE_DESCRIPTION("OF-platform PATA driver");
89*4882a593Smuzhiyun MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
90*4882a593Smuzhiyun MODULE_LICENSE("GPL");
91