/* * $Id: walnut.c,v 1.3 2005/11/07 11:14:29 gleixner Exp $ * * Mapping for Walnut flash * (used ebony.c as a "framework") * * Heikki Lindholm <holindho@infradead.org> * * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> #include <asm/io.h> #include <asm/ibm4xx.h> #include <platforms/4xx/walnut.h> /* these should be in platforms/4xx/walnut.h ? */ #define WALNUT_FLASH_ONBD_N(x) (x & 0x02) #define WALNUT_FLASH_SRAM_SEL(x) (x & 0x01) #define WALNUT_FLASH_LOW 0xFFF00000 #define WALNUT_FLASH_HIGH 0xFFF80000 #define WALNUT_FLASH_SIZE 0x80000 static struct mtd_info *flash; static struct map_info walnut_map = { .name = "Walnut flash", .size = WALNUT_FLASH_SIZE, .bankwidth = 1, }; /* Actually, OpenBIOS is the last 128 KiB of the flash - better * partitioning could be made */ static struct mtd_partition walnut_partitions[] = { { .name = "OpenBIOS", .offset = 0x0, .size = WALNUT_FLASH_SIZE, /*.mask_flags = MTD_WRITEABLE, */ /* force read-only */ } }; int __init init_walnut(void) { u8 fpga_brds1; void *fpga_brds1_adr; void *fpga_status_adr; unsigned long flash_base; /* this should already be mapped (platform/4xx/walnut.c) */ fpga_status_adr = ioremap(WALNUT_FPGA_BASE, 8); if (!fpga_status_adr) return -ENOMEM; fpga_brds1_adr = fpga_status_adr+5; fpga_brds1 = readb(fpga_brds1_adr); /* iounmap(fpga_status_adr); */ if (WALNUT_FLASH_ONBD_N(fpga_brds1)) { printk("The on-board flash is disabled (U79 sw 5)!"); iounmap(fpga_status_adr); return -EIO; } if (WALNUT_FLASH_SRAM_SEL(fpga_brds1)) flash_base = WALNUT_FLASH_LOW; else flash_base = WALNUT_FLASH_HIGH; walnut_map.phys = flash_base; walnut_map.virt = (void __iomem *)ioremap(flash_base, walnut_map.size); if (!walnut_map.virt) { printk("Failed to ioremap flash.\n"); iounmap(fpga_status_adr); return -EIO; } simple_map_init(&walnut_map); flash = do_map_probe("jedec_probe", &walnut_map); if (flash) { flash->owner = THIS_MODULE; add_mtd_partitions(flash, walnut_partitions, ARRAY_SIZE(walnut_partitions)); } else { printk("map probe failed for flash\n"); iounmap(fpga_status_adr); return -ENXIO; } iounmap(fpga_status_adr); return 0; } static void __exit cleanup_walnut(void) { if (flash) { del_mtd_partitions(flash); map_destroy(flash); } if (walnut_map.virt) { iounmap((void *)walnut_map.virt); walnut_map.virt = 0; } } module_init(init_walnut); module_exit(cleanup_walnut); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Heikki Lindholm <holindho@infradead.org>"); MODULE_DESCRIPTION("MTD map and partitions for IBM 405GP Walnut boards");