/*

   * 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/mtd/partitions.h>

  
  #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

  #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 const char * const rom_probe_types[] = { "jedec_probe", NULL };

  
  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,
  	},
  };

  /*

   * MTD partitioning stuff

   */

  static struct mtd_partition partitions[] =

  {
  	{
  		.name = "FileSystem",
  		.size = 0x800000,
  		.offset = 0x00000000
  	},
  };

  static int __init init_impa7(void)

  {

  	const char * const *type;

  	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
  ",
  		       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
  ");
  			return -EIO;
  		}
  		simple_map_init(&impa7_map[i]);

  		impa7_mtd[i] = NULL;

  		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++;

  			mtd_device_parse_register(impa7_mtd[i], NULL, NULL,

  						  partitions,
  						  ARRAY_SIZE(partitions));

  		} else {
  			iounmap((void __iomem *)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]) {

  			mtd_device_unregister(impa7_mtd[i]);

  			map_destroy(impa7_mtd[i]);

  			iounmap((void __iomem *)impa7_map[i].virt);
  			impa7_map[i].virt = NULL;

  		}
  	}
  }
  
  module_init(init_impa7);
  module_exit(cleanup_impa7);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
  MODULE_DESCRIPTION("MTD map driver for implementa impA7");