Merge tag 'mm-nonmm-stable-2022-08-06-2' of git://git.kernel.org/pub/scm/linux/kernel...
[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         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", &reg_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");