145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
/*
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* Handle mapping of the NOR flash on Cogent EDB7312 boards
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*
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* Copyright 2002 SYSGO Real-Time Solutions GmbH
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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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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#ifdef CONFIG_MTD_PARTITIONS
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#include <linux/mtd/partitions.h>
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#endif
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#define WINDOW_ADDR 0x00000000 /* physical properties of flash */
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#define WINDOW_SIZE 0x01000000
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#define BUSWIDTH 2
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#define FLASH_BLOCKSIZE_MAIN 0x20000
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#define FLASH_NUMBLOCKS_MAIN 128
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/* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
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#define PROBETYPES { "cfi_probe", NULL }
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#define MSG_PREFIX "EDB7312-NOR:" /* prefix for our printk()'s */
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#define MTDID "edb7312-nor" /* for mtdparts= partitioning */
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static struct mtd_info *mymtd;
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struct map_info edb7312nor_map = {
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.name = "NOR flash on EDB7312",
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.size = WINDOW_SIZE,
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.bankwidth = BUSWIDTH,
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.phys = WINDOW_ADDR,
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};
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#ifdef CONFIG_MTD_PARTITIONS
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/*
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* MTD partitioning stuff
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*/
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static struct mtd_partition static_partitions[3] =
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{
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{
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.name = "ARMboot",
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.size = 0x40000,
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.offset = 0
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},
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{
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.name = "Kernel",
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.size = 0x200000,
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.offset = 0x40000
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},
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{
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.name = "RootFS",
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.size = 0xDC0000,
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.offset = 0x240000
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},
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};
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static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
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#endif
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static int mtd_parts_nb = 0;
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static struct mtd_partition *mtd_parts = 0;
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static int __init init_edb7312nor(void)
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{
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static const char *rom_probe_types[] = PROBETYPES;
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const char **type;
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const char *part_type = 0;
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printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
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WINDOW_SIZE, WINDOW_ADDR);
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edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
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if (!edb7312nor_map.virt) {
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printk(MSG_PREFIX "failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&edb7312nor_map);
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mymtd = 0;
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type = rom_probe_types;
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for(; !mymtd && *type; type++) {
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mymtd = do_map_probe(*type, &edb7312nor_map);
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}
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if (mymtd) {
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mymtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
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if (mtd_parts_nb > 0)
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part_type = "detected";
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if (mtd_parts_nb == 0)
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{
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mtd_parts = static_partitions;
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mtd_parts_nb = ARRAY_SIZE(static_partitions);
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part_type = "static";
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}
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#endif
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add_mtd_device(mymtd);
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if (mtd_parts_nb == 0)
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printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
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else
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{
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printk(KERN_NOTICE MSG_PREFIX
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"using %s partition definition\n", part_type);
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add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
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}
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return 0;
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}
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iounmap((void *)edb7312nor_map.virt);
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return -ENXIO;
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}
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static void __exit cleanup_edb7312nor(void)
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{
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if (mymtd) {
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del_mtd_device(mymtd);
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map_destroy(mymtd);
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}
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if (edb7312nor_map.virt) {
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iounmap((void *)edb7312nor_map.virt);
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edb7312nor_map.virt = 0;
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}
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}
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module_init(init_edb7312nor);
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module_exit(cleanup_edb7312nor);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
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MODULE_DESCRIPTION("Generic configurable MTD map driver");
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