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