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");
91