projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 69f34c98 TG |
2 | * $Id: walnut.c,v 1.3 2005/11/07 11:14:29 gleixner Exp $ |
| 3 | * | |
| 1da177e4 LT |
4 | * Mapping for Walnut flash |
| 5 | * (used ebony.c as a "framework") | |
| 69f34c98 | 6 | * |
| 1da177e4 | 7 | * Heikki Lindholm <holindho@infradead.org> |
| 69f34c98 TG |
8 | * |
| 9 | * | |
| 1da177e4 LT |
10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the | |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 13 | * option) any later version. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/types.h> | |
| 18 | #include <linux/kernel.h> | |
| 19 | #include <linux/init.h> | |
| 20 | #include <linux/mtd/mtd.h> | |
| 21 | #include <linux/mtd/map.h> | |
| 22 | #include <linux/mtd/partitions.h> | |
| 23 | #include <linux/config.h> | |
| 1da177e4 LT |
24 | #include <asm/io.h> |
| 25 | #include <asm/ibm4xx.h> | |
| 26 | #include <platforms/4xx/walnut.h> | |
| 27 | ||
| 28 | /* these should be in platforms/4xx/walnut.h ? */ | |
| 29 | #define WALNUT_FLASH_ONBD_N(x) (x & 0x02) | |
| 30 | #define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01) | |
| 31 | #define WALNUT_FLASH_LOW 0xFFF00000 | |
| 32 | #define WALNUT_FLASH_HIGH 0xFFF80000 | |
| 33 | #define WALNUT_FLASH_SIZE 0x80000 | |
| 34 | ||
| 35 | static struct mtd_info *flash; | |
| 36 | ||
| 37 | static struct map_info walnut_map = { | |
| 38 | .name = "Walnut flash", | |
| 39 | .size = WALNUT_FLASH_SIZE, | |
| 40 | .bankwidth = 1, | |
| 41 | }; | |
| 42 | ||
| 43 | /* Actually, OpenBIOS is the last 128 KiB of the flash - better | |
| 44 | * partitioning could be made */ | |
| 45 | static struct mtd_partition walnut_partitions[] = { | |
| 46 | { | |
| 47 | .name = "OpenBIOS", | |
| 48 | .offset = 0x0, | |
| 49 | .size = WALNUT_FLASH_SIZE, | |
| 69f34c98 | 50 | /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */ |
| 1da177e4 LT |
51 | } |
| 52 | }; | |
| 53 | ||
| 54 | int __init init_walnut(void) | |
| 55 | { | |
| 56 | u8 fpga_brds1; | |
| 57 | void *fpga_brds1_adr; | |
| 58 | void *fpga_status_adr; | |
| 59 | unsigned long flash_base; | |
| 60 | ||
| 61 | /* this should already be mapped (platform/4xx/walnut.c) */ | |
| 62 | fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8); | |
| 63 | if (!fpga_status_adr) | |
| 64 | return -ENOMEM; | |
| 65 | ||
| 66 | fpga_brds1_adr = fpga_status_adr+5; | |
| 67 | fpga_brds1 = readb(fpga_brds1_adr); | |
| 68 | /* iounmap(fpga_status_adr); */ | |
| 69 | ||
| 70 | if (WALNUT_FLASH_ONBD_N(fpga_brds1)) { | |
| 71 | printk("The on-board flash is disabled (U79 sw 5)!"); | |
| 72 | return -EIO; | |
| 73 | } | |
| 69f34c98 | 74 | if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) |
| 1da177e4 LT |
75 | flash_base = WALNUT_FLASH_LOW; |
| 76 | else | |
| 77 | flash_base = WALNUT_FLASH_HIGH; | |
| 69f34c98 | 78 | |
| 1da177e4 LT |
79 | walnut_map.phys = flash_base; |
| 80 | walnut_map.virt = | |
| 81 | (void __iomem *)ioremap(flash_base, walnut_map.size); | |
| 82 | ||
| 83 | if (!walnut_map.virt) { | |
| 84 | printk("Failed to ioremap flash.\n"); | |
| 85 | return -EIO; | |
| 86 | } | |
| 87 | ||
| 88 | simple_map_init(&walnut_map); | |
| 89 | ||
| 90 | flash = do_map_probe("jedec_probe", &walnut_map); | |
| 91 | if (flash) { | |
| 92 | flash->owner = THIS_MODULE; | |
| 93 | add_mtd_partitions(flash, walnut_partitions, | |
| 94 | ARRAY_SIZE(walnut_partitions)); | |
| 95 | } else { | |
| 96 | printk("map probe failed for flash\n"); | |
| 97 | return -ENXIO; | |
| 98 | } | |
| 99 | ||
| 100 | return 0; | |
| 101 | } | |
| 102 | ||
| 103 | static void __exit cleanup_walnut(void) | |
| 104 | { | |
| 105 | if (flash) { | |
| 106 | del_mtd_partitions(flash); | |
| 107 | map_destroy(flash); | |
| 108 | } | |
| 109 | ||
| 110 | if (walnut_map.virt) { | |
| 111 | iounmap((void *)walnut_map.virt); | |
| 112 | walnut_map.virt = 0; | |
| 113 | } | |
| 114 | } | |
| 115 | ||
| 116 | module_init(init_walnut); | |
| 117 | module_exit(cleanup_walnut); | |
| 118 | ||
| 119 | MODULE_LICENSE("GPL"); | |
| 120 | MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>"); | |
| 121 | MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards"); |