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/*
* OF-platform PATA driver
*
* Copyright (c) 2007 MontaVista Software, Inc.
* Anton Vorontsov <avorontsov@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>
#include <linux/libata.h>
static int pata_of_platform_probe(struct platform_device *ofdev)
{
int ret;
struct device_node *dn = ofdev->dev.of_node;
struct resource io_res;
struct resource ctl_res;
struct resource *irq_res;
unsigned int reg_shift = 0;
int pio_mode = 0;
int pio_mask;
const u32 *prop;
ret = of_address_to_resource(dn, 0, &io_res);
if (ret) {
dev_err(&ofdev->dev, "can't get IO address from "
"device tree\n");
return -EINVAL;
}
if (of_device_is_compatible(dn, "electra-ide")) {
/* Altstatus is really at offset 0x3f6 from the primary window
* on electra-ide. Adjust ctl_res and io_res accordingly.
*/
ctl_res = io_res;
ctl_res.start = ctl_res.start+0x3f6;
io_res.end = ctl_res.start-1;
} else {
ret = of_address_to_resource(dn, 1, &ctl_res);
if (ret) {
dev_err(&ofdev->dev, "can't get CTL address from "
"device tree\n");
return -EINVAL;
}
}
irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
if (irq_res)
irq_res->flags = 0;
prop = of_get_property(dn, "reg-shift", NULL);
if (prop)
reg_shift = be32_to_cpup(prop);
prop = of_get_property(dn, "pio-mode", NULL);
if (prop) {
pio_mode = be32_to_cpup(prop);
if (pio_mode > 6) {
dev_err(&ofdev->dev, "invalid pio-mode\n");
return -EINVAL;
}
} else {
dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
}
pio_mask = 1 << pio_mode;
pio_mask |= (1 << pio_mode) - 1;
return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
reg_shift, pio_mask);
}
static struct of_device_id pata_of_platform_match[] = {
{ .compatible = "ata-generic", },
{ .compatible = "electra-ide", },
{},
};
MODULE_DEVICE_TABLE(of, pata_of_platform_match);
static struct platform_driver pata_of_platform_driver = {
.driver = {
.name = "pata_of_platform",
.owner = THIS_MODULE,
.of_match_table = pata_of_platform_match,
},
.probe = pata_of_platform_probe,
.remove = ata_platform_remove_one,
};
module_platform_driver(pata_of_platform_driver);
MODULE_DESCRIPTION("OF-platform PATA driver");
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_LICENSE("GPL");
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