1/*
  2 * OF-platform PATA driver
  3 *
  4 * Copyright (c) 2007  MontaVista Software, Inc.
  5 *                     Anton Vorontsov <avorontsov@ru.mvista.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License (Version 2) as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/kernel.h>
 13#include <linux/module.h>
 14#include <linux/of_address.h>
 15#include <linux/platform_device.h>
 16#include <linux/ata_platform.h>
 
 
 
 
 
 
 
 17
 18static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
 19{
 20	int ret;
 21	struct device_node *dn = ofdev->dev.of_node;
 22	struct resource io_res;
 23	struct resource ctl_res;
 24	struct resource *irq_res;
 25	unsigned int reg_shift = 0;
 26	int pio_mode = 0;
 27	int pio_mask;
 28	const u32 *prop;
 29
 30	ret = of_address_to_resource(dn, 0, &io_res);
 31	if (ret) {
 32		dev_err(&ofdev->dev, "can't get IO address from "
 33			"device tree\n");
 34		return -EINVAL;
 35	}
 36
 37	if (of_device_is_compatible(dn, "electra-ide")) {
 38		/* Altstatus is really at offset 0x3f6 from the primary window
 39		 * on electra-ide. Adjust ctl_res and io_res accordingly.
 40		 */
 41		ctl_res = io_res;
 42		ctl_res.start = ctl_res.start+0x3f6;
 43		io_res.end = ctl_res.start-1;
 44	} else {
 45		ret = of_address_to_resource(dn, 1, &ctl_res);
 46		if (ret) {
 47			dev_err(&ofdev->dev, "can't get CTL address from "
 48				"device tree\n");
 49			return -EINVAL;
 50		}
 51	}
 52
 53	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
 54	if (irq_res)
 55		irq_res->flags = 0;
 56
 57	prop = of_get_property(dn, "reg-shift", NULL);
 58	if (prop)
 59		reg_shift = be32_to_cpup(prop);
 60
 61	prop = of_get_property(dn, "pio-mode", NULL);
 62	if (prop) {
 63		pio_mode = be32_to_cpup(prop);
 64		if (pio_mode > 6) {
 65			dev_err(&ofdev->dev, "invalid pio-mode\n");
 66			return -EINVAL;
 67		}
 68	} else {
 69		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
 70	}
 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_res,
 76				     reg_shift, pio_mask);
 77}
 78
 79static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
 80{
 81	return __pata_platform_remove(&ofdev->dev);
 82}
 83
 84static struct of_device_id pata_of_platform_match[] = {
 85	{ .compatible = "ata-generic", },
 86	{ .compatible = "electra-ide", },
 87	{},
 88};
 89MODULE_DEVICE_TABLE(of, pata_of_platform_match);
 90
 91static struct platform_driver pata_of_platform_driver = {
 92	.driver = {
 93		.name = "pata_of_platform",
 94		.owner = THIS_MODULE,
 95		.of_match_table = pata_of_platform_match,
 96	},
 97	.probe		= pata_of_platform_probe,
 98	.remove		= __devexit_p(pata_of_platform_remove),
 99};
100
101module_platform_driver(pata_of_platform_driver);
102
103MODULE_DESCRIPTION("OF-platform PATA driver");
104MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
105MODULE_LICENSE("GPL");

 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 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
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
71static const struct of_device_id pata_of_platform_match[] = {
72	{ .compatible = "ata-generic", },
73	{ },
 
74};
75MODULE_DEVICE_TABLE(of, pata_of_platform_match);
76
77static 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
86module_platform_driver(pata_of_platform_driver);
87
88MODULE_DESCRIPTION("OF-platform PATA driver");
89MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
90MODULE_LICENSE("GPL");