impa7.c

老版本的mtd-snap

/*
 * $Id: impa7.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $
 *
 * Handle mapping of the NOR flash on implementa A7 boards
 *
 * Copyright 2002 SYSGO Real-Time Solutions GmbH
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>

#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif

#define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
#define WINDOW_SIZE0 0x00800000
#define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
#define WINDOW_SIZE1 0x00800000
#define NUM_FLASHBANKS 2
#define BUSWIDTH     4

/* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
#define PROBETYPES { "jedec_probe", NULL }

#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */

static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];


static struct map_info impa7_map[NUM_FLASHBANKS] = {
	{
		.name = "impA7 NOR Flash Bank #0",
		.size = WINDOW_SIZE0,
		.bankwidth = BUSWIDTH,
	},
	{
		.name = "impA7 NOR Flash Bank #1",
		.size = WINDOW_SIZE1,
		.bankwidth = BUSWIDTH,
	},
};

#ifdef CONFIG_MTD_PARTITIONS

/*
 * MTD partitioning stuff 
 */
static struct mtd_partition static_partitions[] =
{
	{
		.name = "FileSystem",
		.size = 0x800000,
		.offset = 0x00000000
	},
};

static int mtd_parts_nb[NUM_FLASHBANKS];
static struct mtd_partition *mtd_parts[NUM_FLASHBANKS];

#endif

static const char *probes[] = { "cmdlinepart", NULL };

int __init init_impa7(void)
{
	static const char *rom_probe_types[] = PROBETYPES;
	const char **type;
	const char *part_type = 0;
	int i;
	static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
	  { WINDOW_ADDR0, WINDOW_SIZE0 },
	  { WINDOW_ADDR1, WINDOW_SIZE1 },
        };
	int devicesfound = 0;

	for(i=0; i<NUM_FLASHBANKS; i++)
	{
		printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
		       pt[i].size, pt[i].addr);

		impa7_map[i].phys = pt[i].addr;
		impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
		if (!impa7_map[i].virt) {
			printk(MSG_PREFIX "failed to ioremap\n");
			return -EIO;
		}
		simple_map_init(&impa7_map[i]);

		impa7_mtd[i] = 0;
		type = rom_probe_types;
		for(; !impa7_mtd[i] && *type; type++) {
			impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
		}

		if (impa7_mtd[i]) {
			impa7_mtd[i]->owner = THIS_MODULE;
			devicesfound++;
#ifdef CONFIG_MTD_PARTITIONS
			mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i], 
							       probes,
							       &mtd_parts[i], 
							       0);
			if (mtd_parts_nb[i] > 0) {
				part_type = "command line";
			} else {
				mtd_parts[i] = static_partitions;
				mtd_parts_nb[i] = ARRAY_SIZE(static_partitions);
				part_type = "static";
			}

			printk(KERN_NOTICE MSG_PREFIX
			       "using %s partition definition\n", 
			       part_type);
			add_mtd_partitions(impa7_mtd[i], 
					   mtd_parts[i], mtd_parts_nb[i]);
#else
			add_mtd_device(impa7_mtd[i]);

#endif
		}
		else 
			iounmap((void *)impa7_map[i].virt);
	}
	return devicesfound == 0 ? -ENXIO : 0;
}

static void __exit cleanup_impa7(void)
{
	int i;
	for (i=0; i<NUM_FLASHBANKS; i++) {
		if (impa7_mtd[i]) {
#ifdef CONFIG_MTD_PARTITIONS
			del_mtd_partitions(impa7_mtd[i]);
#else
			del_mtd_device(impa7_mtd[i]);
#endif
			map_destroy(impa7_mtd[i]);
			iounmap((void *)impa7_map[i].virt);
			impa7_map[i].virt = 0;
		}
	}
}

module_init(init_impa7);
module_exit(cleanup_impa7);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pavel Bartusek <[e-mail]>");
MODULE_DESCRIPTION("MTD map driver for implementa impA7");