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libata: pata_of_platform: OF-Platform PATA device driver

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This driver nicely wraps around pata_platform library functions,
and provides OF platform bus bindings to the PATA devices.

Also add || PPC to the PATA_PLATFORM's "depends on" Kconfig entry,
needed for PA Semi Electra.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Anton Vorontsov 2008-01-09 22:10:41 +03:00 committed by Olof Johansson
parent cf03613e96
commit 61f7162117
3 changed files with 116 additions and 1 deletions
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12
drivers/ata/Kconfig
View file

@ -607,13 +607,23 @@ config PATA_WINBOND_VLB
config PATA_PLATFORM
tristate "Generic platform device PATA support"
depends on EMBEDDED || ARCH_RPC
depends on EMBEDDED || ARCH_RPC || PPC
help
This option enables support for generic directly connected ATA
devices commonly found on embedded systems.
If unsure, say N.
config PATA_OF_PLATFORM
tristate "OpenFirmware platform device PATA support"
depends on PATA_PLATFORM && PPC_OF
help
This option enables support for generic directly connected ATA
devices commonly found on embedded systems with OpenFirmware
bindings.
If unsure, say N.
config PATA_ICSIDE
tristate "Acorn ICS PATA support"
depends on ARM && ARCH_ACORN

1
drivers/ata/Makefile
View file

@ -67,6 +67,7 @@ obj-$(CONFIG_PATA_IXP4XX_CF) += pata_ixp4xx_cf.o
obj-$(CONFIG_PATA_SCC) += pata_scc.o
obj-$(CONFIG_PATA_BF54X) += pata_bf54x.o
obj-$(CONFIG_PATA_PLATFORM) += pata_platform.o
obj-$(CONFIG_PATA_OF_PLATFORM) += pata_of_platform.o
obj-$(CONFIG_PATA_ICSIDE) += pata_icside.o
# Should be last but two libata driver
obj-$(CONFIG_PATA_ACPI) += pata_acpi.o

104
drivers/ata/pata_of_platform.c Normal file
View file

@ -0,0 +1,104 @@
/*
* 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_platform.h>
#include <linux/pata_platform.h>
static int __devinit pata_of_platform_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
int ret;
struct device_node *dn = ofdev->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;
}
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;
}
ret = of_irq_to_resource(dn, 0, &irq_res);
if (ret == NO_IRQ)
irq_res.start = irq_res.end = -1;
else
irq_res.flags = 0;
prop = of_get_property(dn, "reg-shift", NULL);
if (prop)
reg_shift = *prop;
prop = of_get_property(dn, "pio-mode", NULL);
if (prop) {
pio_mode = *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 int __devexit pata_of_platform_remove(struct of_device *ofdev)
{
return __pata_platform_remove(&ofdev->dev);
}
static struct of_device_id pata_of_platform_match[] = {
{ .compatible = "ata-generic", },
{},
};
MODULE_DEVICE_TABLE(of, pata_of_platform_match);
static struct of_platform_driver pata_of_platform_driver = {
.name = "pata_of_platform",
.match_table = pata_of_platform_match,
.probe = pata_of_platform_probe,
.remove = __devexit_p(pata_of_platform_remove),
};
static int __init pata_of_platform_init(void)
{
return of_register_platform_driver(&pata_of_platform_driver);
}
module_init(pata_of_platform_init);
static void __exit pata_of_platform_exit(void)
{
of_unregister_platform_driver(&pata_of_platform_driver);
}
module_exit(pata_of_platform_exit);
MODULE_DESCRIPTION("OF-platform PATA driver");
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_LICENSE("GPL");