188 lines
4.8 KiB
C
188 lines
4.8 KiB
C
/*
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* Flash memory access on Alchemy Db1550 board
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*
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* $Id: db1550-flash.c,v 1.7 2004/11/04 13:24:14 gleixner Exp $
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*
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* (C) 2004 Embedded Edge, LLC, based on db1550-flash.c:
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* (C) 2003, 2004 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/init.h>
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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/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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static unsigned long window_addr;
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static unsigned long window_size;
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static struct map_info db1550_map = {
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.name = "Db1550 flash",
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};
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static unsigned char flash_bankwidth = 4;
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/*
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* Support only 64MB NOR Flash parts
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*/
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#if defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
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#define DB1550_BOTH_BANKS
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#elif defined(CONFIG_MTD_DB1550_BOOT) && !defined(CONFIG_MTD_DB1550_USER)
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#define DB1550_BOOT_ONLY
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#elif !defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)
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#define DB1550_USER_ONLY
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#endif
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#ifdef DB1550_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 db1550_partitions[] = {
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/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
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* 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
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* 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
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*/
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{
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.name = "User FS",
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.size = (0x1FC00000 - 0x18000000),
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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 yamon env */
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#elif defined(DB1550_BOOT_ONLY)
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static struct mtd_partition db1550_partitions[] = {
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/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
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* 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash
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*/
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{
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.name = "User FS",
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.size = 0x03c00000,
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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 yamon env */
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.offset = MTDPART_OFS_APPEND,
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}
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};
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#elif defined(DB1550_USER_ONLY)
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static struct mtd_partition db1550_partitions[] = {
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/* assume boot[2:0]:swap is '0000' or '1000', which translates to:
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* 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash
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*/
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{
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.name = "User FS",
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.size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */
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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_DB1550 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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static struct mtd_info *mymtd;
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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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#if defined(DB1550_BOTH_BANKS)
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window_addr = 0x18000000;
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window_size = 0x8000000;
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#elif defined(DB1550_BOOT_ONLY)
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window_addr = 0x1C000000;
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window_size = 0x4000000;
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#else /* USER ONLY */
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window_addr = 0x18000000;
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window_size = 0x4000000;
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#endif
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return 0;
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}
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int __init db1550_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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/* Default flash bankwidth */
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db1550_map.bankwidth = flash_bankwidth;
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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 = db1550_partitions;
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nb_parts = NB_OF(db1550_partitions);
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db1550_map.size = window_size;
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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 "Db1550 flash: probing %d-bit flash bus\n",
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db1550_map.bankwidth*8);
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db1550_map.virt = ioremap(window_addr, window_size);
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mymtd = do_map_probe("cfi_probe", &db1550_map);
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if (!mymtd) return -ENXIO;
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mymtd->owner = THIS_MODULE;
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add_mtd_partitions(mymtd, parts, nb_parts);
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return 0;
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}
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static void __exit db1550_mtd_cleanup(void)
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{
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if (mymtd) {
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del_mtd_partitions(mymtd);
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map_destroy(mymtd);
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iounmap((void *) db1550_map.virt);
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}
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}
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module_init(db1550_mtd_init);
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module_exit(db1550_mtd_cleanup);
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MODULE_AUTHOR("Embedded Edge, LLC");
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MODULE_DESCRIPTION("Db1550 mtd map driver");
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MODULE_LICENSE("GPL");
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