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/*
* Copyright (C) 2007 PA Semi, Inc
*
* Maintained by: Olof Johansson <olof@lixom.net>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/platform_device.h>
#include <asm/prom.h>
#include <asm/system.h>
/* The electra IDE interface is incredibly simple: Just a device on the localbus
* with interrupts hooked up to one of the GPIOs. The device tree contains the
* address window and interrupt mappings already, and the pata_platform driver handles
* the rest. We just need to hook the two up.
*/
#define MAX_IFS 4 /* really, we have only one */
static struct platform_device *pdevs[MAX_IFS];
static int __devinit electra_ide_init(void)
{
struct device_node *np;
struct resource r[3];
int ret = 0;
int i;
np = of_find_compatible_node(NULL, "ide", "electra-ide");
i = 0;
while (np && i < MAX_IFS) {
memset(r, 0, sizeof(r));
/* pata_platform wants two address ranges: one for the base registers,
* another for the control (altstatus). It's located at offset 0x3f6 in
* the window, but the device tree only has one large register window
* that covers both ranges. So we need to split it up by hand here:
*/
ret = of_address_to_resource(np, 0, &r[0]);
if (ret)
goto out;
ret = of_address_to_resource(np, 0, &r[1]);
if (ret)
goto out;
r[1].start += 0x3f6;
r[0].end = r[1].start-1;
r[2].start = irq_of_parse_and_map(np, 0);
r[2].end = irq_of_parse_and_map(np, 0);
r[2].flags = IORESOURCE_IRQ;
pr_debug("registering platform device at 0x%lx/0x%lx, irq is %ld\n",
r[0].start, r[1].start, r[2].start);
pdevs[i] = platform_device_register_simple("pata_platform", i, r, 3);
if (IS_ERR(pdevs[i])) {
ret = PTR_ERR(pdevs[i]);
pdevs[i] = NULL;
goto out;
}
np = of_find_compatible_node(np, "ide", "electra-ide");
}
out:
return ret;
}
module_init(electra_ide_init);
static void __devexit electra_ide_exit(void)
{
int i;
for (i = 0; i < MAX_IFS; i++)
if (pdevs[i])
platform_device_unregister(pdevs[i]);
}
module_exit(electra_ide_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi Electra IDE driver");
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