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226 lines
6.1 KiB
226 lines
6.1 KiB
/*
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* Flash memory access on Alchemy Db1xxx boards
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*
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* $Id: db1x00-flash.c,v 1.6 2004/11/04 13:24:14 gleixner Exp $
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*
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* (C) 2003 Pete Popov <ppopov@embeddedalley.com>
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.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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#ifdef DEBUG_RW
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#define DBG(x...) printk(x)
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#else
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#define DBG(x...)
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#endif
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/* MTD CONFIG OPTIONS */
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#if defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
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#define DB1X00_BOTH_BANKS
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#elif defined(CONFIG_MTD_DB1X00_BOOT) && !defined(CONFIG_MTD_DB1X00_USER)
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#define DB1X00_BOOT_ONLY
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#elif !defined(CONFIG_MTD_DB1X00_BOOT) && defined(CONFIG_MTD_DB1X00_USER)
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#define DB1X00_USER_ONLY
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#endif
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static unsigned long window_addr;
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static unsigned long window_size;
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static unsigned long flash_size;
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static unsigned short *bcsr = (unsigned short *)0xAE000000;
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static unsigned char flash_bankwidth = 4;
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/*
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* The Db1x boards support different flash densities. We setup
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* the mtd_partition structures below for default of 64Mbit
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* flash densities, and override the partitions sizes, if
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* necessary, after we check the board status register.
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*/
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#ifdef DB1X00_BOTH_BANKS
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/* both banks will be used. Combine the first bank and the first
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* part of the second bank together into a single jffs/jffs2
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* partition.
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*/
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static struct mtd_partition db1x00_partitions[] = {
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{
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.name = "User FS",
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.size = 0x1c00000,
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.offset = 0x0000000
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},{
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.name = "yamon",
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.size = 0x0100000,
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.offset = MTDPART_OFS_APPEND,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "raw kernel",
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.size = (0x300000-0x40000), /* last 256KB is env */
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#elif defined(DB1X00_BOOT_ONLY)
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static struct mtd_partition db1x00_partitions[] = {
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{
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.name = "User FS",
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.size = 0x00c00000,
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.offset = 0x0000000
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},{
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.name = "yamon",
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.size = 0x0100000,
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.offset = MTDPART_OFS_APPEND,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "raw kernel",
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.size = (0x300000-0x40000), /* last 256KB is env */
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#elif defined(DB1X00_USER_ONLY)
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static struct mtd_partition db1x00_partitions[] = {
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{
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.name = "User FS",
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.size = 0x0e00000,
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.offset = 0x0000000
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},{
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.name = "raw kernel",
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.size = MTDPART_SIZ_FULL,
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#else
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#error MTD_DB1X00 define combo error /* should never happen */
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#endif
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#define NB_OF(x) (sizeof(x)/sizeof(x[0]))
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#define NAME "Db1x00 Linux Flash"
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static struct map_info db1xxx_mtd_map = {
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.name = NAME,
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};
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static struct mtd_partition *parsed_parts;
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static struct mtd_info *db1xxx_mtd;
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/*
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* Probe the flash density and setup window address and size
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* based on user CONFIG options. There are times when we don't
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* want the MTD driver to be probing the boot or user flash,
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* so having the option to enable only one bank is important.
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*/
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int setup_flash_params(void)
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{
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switch ((bcsr[2] >> 14) & 0x3) {
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case 0: /* 64Mbit devices */
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flash_size = 0x800000; /* 8MB per part */
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#if defined(DB1X00_BOTH_BANKS)
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window_addr = 0x1E000000;
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window_size = 0x2000000;
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#elif defined(DB1X00_BOOT_ONLY)
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window_addr = 0x1F000000;
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window_size = 0x1000000;
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#else /* USER ONLY */
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window_addr = 0x1E000000;
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window_size = 0x1000000;
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#endif
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break;
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case 1:
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/* 128 Mbit devices */
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flash_size = 0x1000000; /* 16MB per part */
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#if defined(DB1X00_BOTH_BANKS)
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window_addr = 0x1C000000;
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window_size = 0x4000000;
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/* USERFS from 0x1C00 0000 to 0x1FC0 0000 */
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db1x00_partitions[0].size = 0x3C00000;
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#elif defined(DB1X00_BOOT_ONLY)
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window_addr = 0x1E000000;
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window_size = 0x2000000;
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/* USERFS from 0x1E00 0000 to 0x1FC0 0000 */
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db1x00_partitions[0].size = 0x1C00000;
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#else /* USER ONLY */
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window_addr = 0x1C000000;
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window_size = 0x2000000;
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/* USERFS from 0x1C00 0000 to 0x1DE00000 */
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db1x00_partitions[0].size = 0x1DE0000;
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#endif
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break;
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case 2:
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/* 256 Mbit devices */
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flash_size = 0x4000000; /* 64MB per part */
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#if defined(DB1X00_BOTH_BANKS)
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return 1;
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#elif defined(DB1X00_BOOT_ONLY)
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/* Boot ROM flash bank only; no user bank */
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window_addr = 0x1C000000;
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window_size = 0x4000000;
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/* USERFS from 0x1C00 0000 to 0x1FC00000 */
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db1x00_partitions[0].size = 0x3C00000;
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#else /* USER ONLY */
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return 1;
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#endif
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break;
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default:
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return 1;
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}
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db1xxx_mtd_map.size = window_size;
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db1xxx_mtd_map.bankwidth = flash_bankwidth;
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db1xxx_mtd_map.phys = window_addr;
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db1xxx_mtd_map.bankwidth = flash_bankwidth;
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return 0;
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}
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int __init db1x00_mtd_init(void)
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{
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struct mtd_partition *parts;
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int nb_parts = 0;
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if (setup_flash_params())
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return -ENXIO;
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/*
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* Static partition definition selection
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*/
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parts = db1x00_partitions;
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nb_parts = NB_OF(db1x00_partitions);
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/*
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* Now let's probe for the actual flash. Do it here since
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* specific machine settings might have been set above.
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*/
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printk(KERN_NOTICE "Db1xxx flash: probing %d-bit flash bus\n",
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db1xxx_mtd_map.bankwidth*8);
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db1xxx_mtd_map.virt = ioremap(window_addr, window_size);
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db1xxx_mtd = do_map_probe("cfi_probe", &db1xxx_mtd_map);
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if (!db1xxx_mtd) return -ENXIO;
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db1xxx_mtd->owner = THIS_MODULE;
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add_mtd_partitions(db1xxx_mtd, parts, nb_parts);
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return 0;
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}
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static void __exit db1x00_mtd_cleanup(void)
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{
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if (db1xxx_mtd) {
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del_mtd_partitions(db1xxx_mtd);
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map_destroy(db1xxx_mtd);
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if (parsed_parts)
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kfree(parsed_parts);
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}
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}
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module_init(db1x00_mtd_init);
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module_exit(db1x00_mtd_cleanup);
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MODULE_AUTHOR("Pete Popov");
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MODULE_DESCRIPTION("Db1x00 mtd map driver");
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MODULE_LICENSE("GPL");
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