167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
/*
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* Flash memory access on AMD Alchemy evaluation boards
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*
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* (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
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*/
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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 CONFIG_MIPS_PB1000
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#define BOARD_MAP_NAME "Pb1000 Flash"
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#define BOARD_FLASH_SIZE 0x00800000 /* 8MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_PB1500
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#define BOARD_MAP_NAME "Pb1500 Flash"
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#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_PB1100
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#define BOARD_MAP_NAME "Pb1100 Flash"
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#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_PB1550
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#define BOARD_MAP_NAME "Pb1550 Flash"
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#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_PB1200
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#define BOARD_MAP_NAME "Pb1200 Flash"
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#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
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#define BOARD_FLASH_WIDTH 2 /* 16-bits */
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#endif
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#ifdef CONFIG_MIPS_DB1000
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#define BOARD_MAP_NAME "Db1000 Flash"
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#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_DB1500
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#define BOARD_MAP_NAME "Db1500 Flash"
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#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_DB1100
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#define BOARD_MAP_NAME "Db1100 Flash"
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#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_DB1550
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#define BOARD_MAP_NAME "Db1550 Flash"
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#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#endif
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#ifdef CONFIG_MIPS_DB1200
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#define BOARD_MAP_NAME "Db1200 Flash"
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#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
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#define BOARD_FLASH_WIDTH 2 /* 16-bits */
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#endif
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#ifdef CONFIG_MIPS_BOSPORUS
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#define BOARD_MAP_NAME "Bosporus Flash"
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#define BOARD_FLASH_SIZE 0x01000000 /* 16MB */
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#define BOARD_FLASH_WIDTH 2 /* 16-bits */
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#endif
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#ifdef CONFIG_MIPS_MIRAGE
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#define BOARD_MAP_NAME "Mirage Flash"
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#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
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#define BOARD_FLASH_WIDTH 4 /* 32-bits */
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#define USE_LOCAL_ACCESSORS /* why? */
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#endif
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static struct map_info alchemy_map = {
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.name = BOARD_MAP_NAME,
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};
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static struct mtd_partition alchemy_partitions[] = {
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{
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.name = "User FS",
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.size = BOARD_FLASH_SIZE - 0x00400000,
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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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static struct mtd_info *mymtd;
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static int __init alchemy_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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unsigned long window_addr;
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unsigned long window_size;
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/* Default flash buswidth */
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alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
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window_addr = 0x20000000 - BOARD_FLASH_SIZE;
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window_size = BOARD_FLASH_SIZE;
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/*
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* Static partition definition selection
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*/
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parts = alchemy_partitions;
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nb_parts = ARRAY_SIZE(alchemy_partitions);
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alchemy_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 BOARD_MAP_NAME ": probing %d-bit flash bus\n",
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alchemy_map.bankwidth*8);
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alchemy_map.virt = ioremap(window_addr, window_size);
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mymtd = do_map_probe("cfi_probe", &alchemy_map);
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if (!mymtd) {
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iounmap(alchemy_map.virt);
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return -ENXIO;
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}
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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 alchemy_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(alchemy_map.virt);
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}
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}
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module_init(alchemy_mtd_init);
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module_exit(alchemy_mtd_cleanup);
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MODULE_AUTHOR("Embedded Alley Solutions, Inc");
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MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
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MODULE_LICENSE("GPL");
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