171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/*
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* $Id: lubbock-flash.c,v 1.21 2005/11/07 11:14:27 gleixner Exp $
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*
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* Map driver for the Lubbock developer platform.
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*
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* Author: Nicolas Pitre
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* Copyright: (C) 2001 MontaVista Software Inc.
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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 <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/lubbock.h>
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#define ROM_ADDR 0x00000000
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#define FLASH_ADDR 0x04000000
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#define WINDOW_SIZE 64*1024*1024
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static void lubbock_map_inval_cache(struct map_info *map, unsigned long from, ssize_t len)
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{
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consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
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}
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static struct map_info lubbock_maps[2] = { {
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.size = WINDOW_SIZE,
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.phys = 0x00000000,
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.inval_cache = lubbock_map_inval_cache,
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}, {
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.size = WINDOW_SIZE,
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.phys = 0x04000000,
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.inval_cache = lubbock_map_inval_cache,
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} };
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static struct mtd_partition lubbock_partitions[] = {
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{
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.name = "Bootloader",
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.size = 0x00040000,
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.offset = 0,
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.mask_flags = MTD_WRITEABLE /* force read-only */
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},{
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.name = "Kernel",
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.size = 0x00100000,
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.offset = 0x00040000,
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},{
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.name = "Filesystem",
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.size = MTDPART_SIZ_FULL,
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.offset = 0x00140000
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}
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};
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static struct mtd_info *mymtds[2];
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static struct mtd_partition *parsed_parts[2];
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static int nr_parsed_parts[2];
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static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
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static int __init init_lubbock(void)
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{
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int flashboot = (LUB_CONF_SWITCHES & 1);
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int ret = 0, i;
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lubbock_maps[0].bankwidth = lubbock_maps[1].bankwidth =
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(BOOT_DEF & 1) ? 2 : 4;
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/* Compensate for the nROMBT switch which swaps the flash banks */
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printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
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flashboot?"Flash":"ROM", flashboot);
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lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
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lubbock_maps[flashboot].name = "Lubbock Boot ROM";
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for (i = 0; i < 2; i++) {
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lubbock_maps[i].virt = ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
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if (!lubbock_maps[i].virt) {
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printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
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if (!ret)
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ret = -ENOMEM;
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continue;
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}
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lubbock_maps[i].cached = ioremap_cached(lubbock_maps[i].phys, WINDOW_SIZE);
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if (!lubbock_maps[i].cached)
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printk(KERN_WARNING "Failed to ioremap cached %s\n", lubbock_maps[i].name);
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simple_map_init(&lubbock_maps[i]);
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printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit bankwidth)\n",
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lubbock_maps[i].name, lubbock_maps[i].phys,
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lubbock_maps[i].bankwidth * 8);
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mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
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if (!mymtds[i]) {
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iounmap((void *)lubbock_maps[i].virt);
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if (lubbock_maps[i].cached)
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iounmap(lubbock_maps[i].cached);
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if (!ret)
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ret = -EIO;
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continue;
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}
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mymtds[i]->owner = THIS_MODULE;
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ret = parse_mtd_partitions(mymtds[i], probes,
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&parsed_parts[i], 0);
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if (ret > 0)
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nr_parsed_parts[i] = ret;
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}
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if (!mymtds[0] && !mymtds[1])
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return ret;
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for (i = 0; i < 2; i++) {
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if (!mymtds[i]) {
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printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
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} else if (nr_parsed_parts[i]) {
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add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
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} else if (!i) {
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printk("Using static partitions on %s\n", lubbock_maps[i].name);
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add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
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} else {
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printk("Registering %s as whole device\n", lubbock_maps[i].name);
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add_mtd_device(mymtds[i]);
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}
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}
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return 0;
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}
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static void __exit cleanup_lubbock(void)
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{
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int i;
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for (i = 0; i < 2; i++) {
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if (!mymtds[i])
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continue;
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if (nr_parsed_parts[i] || !i)
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del_mtd_partitions(mymtds[i]);
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else
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del_mtd_device(mymtds[i]);
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map_destroy(mymtds[i]);
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iounmap((void *)lubbock_maps[i].virt);
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if (lubbock_maps[i].cached)
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iounmap(lubbock_maps[i].cached);
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kfree(parsed_parts[i]);
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}
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}
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module_init(init_lubbock);
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module_exit(cleanup_lubbock);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
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MODULE_DESCRIPTION("MTD map driver for Intel Lubbock");
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