147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
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/*
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* drivers/mtd/maps/dmv182.c
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*
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* Flash map driver for the Dy4 SVME182 board
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*
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* Copyright 2003-2004, TimeSys Corporation
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*
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* Based on the SVME181 flash map, by Tom Nelson, Dot4, Inc. for TimeSys Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.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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#include <linux/mtd/partitions.h>
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#include <linux/errno.h>
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/*
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* This driver currently handles only the 16MiB user flash bank 1 on the
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* board. It does not provide access to bank 0 (contains the Dy4 FFW), bank 2
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* (VxWorks boot), or the optional 48MiB expansion flash.
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*
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* scott.wood@timesys.com: On the newer boards with 128MiB flash, it
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* now supports the first 96MiB (the boot flash bank containing FFW
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* is excluded). The VxWorks loader is in partition 1.
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*/
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#define FLASH_BASE_ADDR 0xf0000000
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#define FLASH_BANK_SIZE (128*1024*1024)
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MODULE_AUTHOR("Scott Wood, TimeSys Corporation <scott.wood@timesys.com>");
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MODULE_DESCRIPTION("User-programmable flash device on the Dy4 SVME182 board");
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MODULE_LICENSE("GPL");
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static struct map_info svme182_map = {
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.name = "Dy4 SVME182",
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.bankwidth = 32,
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.size = 128 * 1024 * 1024
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};
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#define BOOTIMAGE_PART_SIZE ((6*1024*1024)-RESERVED_PART_SIZE)
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// Allow 6MiB for the kernel
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#define NEW_BOOTIMAGE_PART_SIZE (6 * 1024 * 1024)
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// Allow 1MiB for the bootloader
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#define NEW_BOOTLOADER_PART_SIZE (1024 * 1024)
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// Use the remaining 9MiB at the end of flash for the RFS
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#define NEW_RFS_PART_SIZE (0x01000000 - NEW_BOOTLOADER_PART_SIZE - \
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NEW_BOOTIMAGE_PART_SIZE)
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static struct mtd_partition svme182_partitions[] = {
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// The Lower PABS is only 128KiB, but the partition code doesn't
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// like partitions that don't end on the largest erase block
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// size of the device, even if all of the erase blocks in the
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// partition are small ones. The hardware should prevent
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// writes to the actual PABS areas.
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{
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name: "Lower PABS and CPU 0 bootloader or kernel",
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size: 6*1024*1024,
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offset: 0,
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},
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{
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name: "Root Filesystem",
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size: 10*1024*1024,
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offset: MTDPART_OFS_NXTBLK
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},
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{
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name: "CPU1 Bootloader",
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size: 1024*1024,
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offset: MTDPART_OFS_NXTBLK,
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},
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{
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name: "Extra",
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size: 110*1024*1024,
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offset: MTDPART_OFS_NXTBLK
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},
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{
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name: "Foundation Firmware and Upper PABS",
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size: 1024*1024,
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offset: MTDPART_OFS_NXTBLK,
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mask_flags: MTD_WRITEABLE // read-only
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}
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};
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static struct mtd_info *this_mtd;
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static int __init init_svme182(void)
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{
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struct mtd_partition *partitions;
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int num_parts = ARRAY_SIZE(svme182_partitions);
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partitions = svme182_partitions;
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svme182_map.virt = ioremap(FLASH_BASE_ADDR, svme182_map.size);
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if (svme182_map.virt == 0) {
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printk("Failed to ioremap FLASH memory area.\n");
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return -EIO;
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}
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simple_map_init(&svme182_map);
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this_mtd = do_map_probe("cfi_probe", &svme182_map);
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if (!this_mtd)
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{
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iounmap((void *)svme182_map.virt);
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return -ENXIO;
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}
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printk(KERN_NOTICE "SVME182 flash device: %dMiB at 0x%08x\n",
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this_mtd->size >> 20, FLASH_BASE_ADDR);
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this_mtd->owner = THIS_MODULE;
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mtd_device_register(this_mtd, partitions, num_parts);
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return 0;
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}
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static void __exit cleanup_svme182(void)
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{
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if (this_mtd)
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{
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mtd_device_unregister(this_mtd);
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map_destroy(this_mtd);
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}
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if (svme182_map.virt)
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{
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iounmap((void *)svme182_map.virt);
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svme182_map.virt = 0;
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}
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return;
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}
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module_init(init_svme182);
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module_exit(cleanup_svme182);
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