135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* Flash and EPROM on Hitachi Solution Engine and similar boards.
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*
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* (C) 2001 Red Hat, Inc.
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*
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* GPL'd
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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/init.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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static struct mtd_info *flash_mtd;
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static struct mtd_info *eprom_mtd;
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static struct mtd_partition *parsed_parts;
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struct map_info soleng_eprom_map = {
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.name = "Solution Engine EPROM",
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.size = 0x400000,
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.bankwidth = 4,
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};
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struct map_info soleng_flash_map = {
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.name = "Solution Engine FLASH",
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.size = 0x400000,
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.bankwidth = 4,
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};
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static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
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#ifdef CONFIG_MTD_SUPERH_RESERVE
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static struct mtd_partition superh_se_partitions[] = {
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/* Reserved for boot code, read-only */
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{
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.name = "flash_boot",
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.offset = 0x00000000,
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.size = CONFIG_MTD_SUPERH_RESERVE,
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.mask_flags = MTD_WRITEABLE,
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},
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/* All else is writable (e.g. JFFS) */
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{
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.name = "Flash FS",
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.offset = MTDPART_OFS_NXTBLK,
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.size = MTDPART_SIZ_FULL,
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}
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};
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#endif /* CONFIG_MTD_SUPERH_RESERVE */
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static int __init init_soleng_maps(void)
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{
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int nr_parts = 0;
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/* First probe at offset 0 */
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soleng_flash_map.phys = 0;
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soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
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soleng_eprom_map.phys = 0x01000000;
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soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
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simple_map_init(&soleng_eprom_map);
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simple_map_init(&soleng_flash_map);
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printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
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flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
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if (!flash_mtd) {
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/* Not there. Try swapping */
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printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
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soleng_flash_map.phys = 0x01000000;
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soleng_flash_map.virt = P2SEGADDR(0x01000000);
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soleng_eprom_map.phys = 0;
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soleng_eprom_map.virt = P1SEGADDR(0);
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flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
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if (!flash_mtd) {
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/* Eep. */
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printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
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return -ENXIO;
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}
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}
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printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
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soleng_flash_map.phys & 0x1fffffff,
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soleng_eprom_map.phys & 0x1fffffff);
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flash_mtd->owner = THIS_MODULE;
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eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
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if (eprom_mtd) {
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eprom_mtd->owner = THIS_MODULE;
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add_mtd_device(eprom_mtd);
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}
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nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
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#ifdef CONFIG_MTD_SUPERH_RESERVE
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if (nr_parts <= 0) {
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printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
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CONFIG_MTD_SUPERH_RESERVE);
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parsed_parts = superh_se_partitions;
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nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
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}
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#endif /* CONFIG_MTD_SUPERH_RESERVE */
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if (nr_parts > 0)
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add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
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else
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add_mtd_device(flash_mtd);
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return 0;
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}
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static void __exit cleanup_soleng_maps(void)
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{
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if (eprom_mtd) {
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del_mtd_device(eprom_mtd);
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map_destroy(eprom_mtd);
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}
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if (parsed_parts)
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del_mtd_partitions(flash_mtd);
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else
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del_mtd_device(flash_mtd);
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map_destroy(flash_mtd);
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}
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module_init(init_soleng_maps);
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module_exit(cleanup_soleng_maps);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
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MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
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