| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * $Id: walnut.c,v 1.2 2004/12/10 12:07:42 holindho Exp $ |
| 3 | * |
| 4 | * Mapping for Walnut flash |
| 5 | * (used ebony.c as a "framework") |
| 6 | * |
| 7 | * Heikki Lindholm <holindho@infradead.org> |
| 8 | * |
| 9 | * |
| 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> |
| 24 | #include <linux/version.h> |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/ibm4xx.h> |
| 27 | #include <platforms/4xx/walnut.h> |
| 28 | |
| 29 | /* these should be in platforms/4xx/walnut.h ? */ |
| 30 | #define WALNUT_FLASH_ONBD_N(x) (x & 0x02) |
| 31 | #define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01) |
| 32 | #define WALNUT_FLASH_LOW 0xFFF00000 |
| 33 | #define WALNUT_FLASH_HIGH 0xFFF80000 |
| 34 | #define WALNUT_FLASH_SIZE 0x80000 |
| 35 | |
| 36 | static struct mtd_info *flash; |
| 37 | |
| 38 | static struct map_info walnut_map = { |
| 39 | .name = "Walnut flash", |
| 40 | .size = WALNUT_FLASH_SIZE, |
| 41 | .bankwidth = 1, |
| 42 | }; |
| 43 | |
| 44 | /* Actually, OpenBIOS is the last 128 KiB of the flash - better |
| 45 | * partitioning could be made */ |
| 46 | static struct mtd_partition walnut_partitions[] = { |
| 47 | { |
| 48 | .name = "OpenBIOS", |
| 49 | .offset = 0x0, |
| 50 | .size = WALNUT_FLASH_SIZE, |
| 51 | /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */ |
| 52 | } |
| 53 | }; |
| 54 | |
| 55 | int __init init_walnut(void) |
| 56 | { |
| 57 | u8 fpga_brds1; |
| 58 | void *fpga_brds1_adr; |
| 59 | void *fpga_status_adr; |
| 60 | unsigned long flash_base; |
| 61 | |
| 62 | /* this should already be mapped (platform/4xx/walnut.c) */ |
| 63 | fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8); |
| 64 | if (!fpga_status_adr) |
| 65 | return -ENOMEM; |
| 66 | |
| 67 | fpga_brds1_adr = fpga_status_adr+5; |
| 68 | fpga_brds1 = readb(fpga_brds1_adr); |
| 69 | /* iounmap(fpga_status_adr); */ |
| 70 | |
| 71 | if (WALNUT_FLASH_ONBD_N(fpga_brds1)) { |
| 72 | printk("The on-board flash is disabled (U79 sw 5)!"); |
| 73 | return -EIO; |
| 74 | } |
| 75 | if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) |
| 76 | flash_base = WALNUT_FLASH_LOW; |
| 77 | else |
| 78 | flash_base = WALNUT_FLASH_HIGH; |
| 79 | |
| 80 | walnut_map.phys = flash_base; |
| 81 | walnut_map.virt = |
| 82 | (void __iomem *)ioremap(flash_base, walnut_map.size); |
| 83 | |
| 84 | if (!walnut_map.virt) { |
| 85 | printk("Failed to ioremap flash.\n"); |
| 86 | return -EIO; |
| 87 | } |
| 88 | |
| 89 | simple_map_init(&walnut_map); |
| 90 | |
| 91 | flash = do_map_probe("jedec_probe", &walnut_map); |
| 92 | if (flash) { |
| 93 | flash->owner = THIS_MODULE; |
| 94 | add_mtd_partitions(flash, walnut_partitions, |
| 95 | ARRAY_SIZE(walnut_partitions)); |
| 96 | } else { |
| 97 | printk("map probe failed for flash\n"); |
| 98 | return -ENXIO; |
| 99 | } |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static void __exit cleanup_walnut(void) |
| 105 | { |
| 106 | if (flash) { |
| 107 | del_mtd_partitions(flash); |
| 108 | map_destroy(flash); |
| 109 | } |
| 110 | |
| 111 | if (walnut_map.virt) { |
| 112 | iounmap((void *)walnut_map.virt); |
| 113 | walnut_map.virt = 0; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | module_init(init_walnut); |
| 118 | module_exit(cleanup_walnut); |
| 119 | |
| 120 | MODULE_LICENSE("GPL"); |
| 121 | MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>"); |
| 122 | MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards"); |