136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* NOR Flash memory access on TI Toto board
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*
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* jzhang@ti.com (C) 2003 Texas Instruments.
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*
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* (C) 2002 MontVista Software, Inc.
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*
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* $Id: omap-toto-flash.c,v 1.5 2005/11/07 11:14:27 gleixner Exp $
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*/
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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/errno.h>
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#include <linux/init.h>
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#include <linux/slab.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/hardware.h>
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#include <asm/io.h>
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#ifndef CONFIG_ARCH_OMAP
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#error This is for OMAP architecture only
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#endif
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//these lines need be moved to a hardware header file
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#define OMAP_TOTO_FLASH_BASE 0xd8000000
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#define OMAP_TOTO_FLASH_SIZE 0x80000
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static struct map_info omap_toto_map_flash = {
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.name = "OMAP Toto flash",
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.bankwidth = 2,
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.virt = (void __iomem *)OMAP_TOTO_FLASH_BASE,
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};
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static struct mtd_partition toto_flash_partitions[] = {
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{
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.name = "BootLoader",
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.size = 0x00040000, /* hopefully u-boot will stay 128k + 128*/
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.offset = 0,
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.mask_flags = MTD_WRITEABLE, /* force read-only */
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}, {
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.name = "ReservedSpace",
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.size = 0x00030000,
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.offset = MTDPART_OFS_APPEND,
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//mask_flags: MTD_WRITEABLE, /* force read-only */
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}, {
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.name = "EnvArea", /* bottom 64KiB for env vars */
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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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static struct mtd_partition *parsed_parts;
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static struct mtd_info *flash_mtd;
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static int __init init_flash (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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int parsed_nr_parts = 0;
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const char *part_type;
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/*
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* Static partition definition selection
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*/
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part_type = "static";
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parts = toto_flash_partitions;
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nb_parts = ARRAY_SIZE(toto_flash_partitions);
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omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE;
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omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE);
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simple_map_init(&omap_toto_map_flash);
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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 "OMAP toto flash: probing %d-bit flash bus\n",
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omap_toto_map_flash.bankwidth*8);
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flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash);
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if (!flash_mtd)
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return -ENXIO;
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if (parsed_nr_parts > 0) {
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parts = parsed_parts;
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nb_parts = parsed_nr_parts;
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}
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if (nb_parts == 0) {
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printk(KERN_NOTICE "OMAP toto flash: no partition info available,"
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"registering whole flash at once\n");
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if (add_mtd_device(flash_mtd)){
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return -ENXIO;
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}
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} else {
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printk(KERN_NOTICE "Using %s partition definition\n",
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part_type);
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return add_mtd_partitions(flash_mtd, parts, nb_parts);
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}
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return 0;
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}
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int __init omap_toto_mtd_init(void)
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{
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int status;
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if (status = init_flash()) {
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printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n");
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}
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return status;
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}
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static void __exit omap_toto_mtd_cleanup(void)
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{
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if (flash_mtd) {
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del_mtd_partitions(flash_mtd);
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map_destroy(flash_mtd);
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kfree(parsed_parts);
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}
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}
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module_init(omap_toto_mtd_init);
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module_exit(omap_toto_mtd_cleanup);
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MODULE_AUTHOR("Jian Zhang");
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MODULE_DESCRIPTION("OMAP Toto board map driver");
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MODULE_LICENSE("GPL");
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