projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8fa336d8 OJ |
1 | /* |
| 2 | * Copyright (C) 2007 PA Semi, Inc | |
| 3 | * | |
| 4 | * Maintained by: Olof Johansson <olof@lixom.net> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | */ | |
| 19 | ||
| 20 | #include <linux/platform_device.h> | |
| 21 | ||
| 22 | #include <asm/prom.h> | |
| 23 | #include <asm/system.h> | |
| 24 | ||
| 25 | /* The electra IDE interface is incredibly simple: Just a device on the localbus | |
| 26 | * with interrupts hooked up to one of the GPIOs. The device tree contains the | |
| 27 | * address window and interrupt mappings already, and the pata_platform driver handles | |
| 28 | * the rest. We just need to hook the two up. | |
| 29 | */ | |
| 30 | ||
| 31 | #define MAX_IFS 4 /* really, we have only one */ | |
| 32 | ||
| 33 | static struct platform_device *pdevs[MAX_IFS]; | |
| 34 | ||
| 35 | static int __devinit electra_ide_init(void) | |
| 36 | { | |
| 37 | struct device_node *np; | |
| 38 | struct resource r[3]; | |
| 39 | int ret = 0; | |
| 40 | int i; | |
| 41 | ||
| 42 | np = of_find_compatible_node(NULL, "ide", "electra-ide"); | |
| 43 | i = 0; | |
| 44 | ||
| 45 | while (np && i < MAX_IFS) { | |
| 46 | memset(r, 0, sizeof(r)); | |
| 47 | ||
| 48 | /* pata_platform wants two address ranges: one for the base registers, | |
| 49 | * another for the control (altstatus). It's located at offset 0x3f6 in | |
| 50 | * the window, but the device tree only has one large register window | |
| 51 | * that covers both ranges. So we need to split it up by hand here: | |
| 52 | */ | |
| 53 | ||
| 54 | ret = of_address_to_resource(np, 0, &r[0]); | |
| 55 | if (ret) | |
| 56 | goto out; | |
| 57 | ret = of_address_to_resource(np, 0, &r[1]); | |
| 58 | if (ret) | |
| 59 | goto out; | |
| 60 | ||
| 61 | r[1].start += 0x3f6; | |
| 62 | r[0].end = r[1].start-1; | |
| 63 | ||
| 64 | r[2].start = irq_of_parse_and_map(np, 0); | |
| 65 | r[2].end = irq_of_parse_and_map(np, 0); | |
| 66 | r[2].flags = IORESOURCE_IRQ; | |
| 67 | ||
| 68 | pr_debug("registering platform device at 0x%lx/0x%lx, irq is %ld\n", | |
| 69 | r[0].start, r[1].start, r[2].start); | |
| 70 | pdevs[i] = platform_device_register_simple("pata_platform", i, r, 3); | |
| 71 | if (IS_ERR(pdevs[i])) { | |
| 72 | ret = PTR_ERR(pdevs[i]); | |
| 73 | pdevs[i] = NULL; | |
| 74 | goto out; | |
| 75 | } | |
| 76 | np = of_find_compatible_node(np, "ide", "electra-ide"); | |
| 77 | } | |
| 78 | out: | |
| 79 | return ret; | |
| 80 | } | |
| 81 | module_init(electra_ide_init); | |
| 82 | ||
| 83 | static void __devexit electra_ide_exit(void) | |
| 84 | { | |
| 85 | int i; | |
| 86 | ||
| 87 | for (i = 0; i < MAX_IFS; i++) | |
| 88 | if (pdevs[i]) | |
| 89 | platform_device_unregister(pdevs[i]); | |
| 90 | } | |
| 91 | module_exit(electra_ide_exit); | |
| 92 | ||
| 93 | ||
| 94 | MODULE_LICENSE("GPL"); | |
| 95 | MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>"); | |
| 96 | MODULE_DESCRIPTION("PA Semi Electra IDE driver"); |