Merge tag 'efi-core-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / ata / pata_of_platform.c
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
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", &reg_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");