solutionengine.c
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上传日期:2013-02-24
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- /*
- * $Id: solutionengine.c,v 1.4 2001/11/07 01:20:59 jsiegel Exp $
- *
- * Flash and EPROM on Hitachi Solution Engine and similar boards.
- *
- * (C) 2001 Red Hat, Inc.
- *
- * GPL'd
- */
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <asm/io.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/map.h>
- #include <linux/mtd/partitions.h>
- #include <linux/config.h>
- extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts);
- __u32 soleng_read32(struct map_info *map, unsigned long ofs)
- {
- return __raw_readl(map->map_priv_1 + ofs);
- }
- void soleng_write32(struct map_info *map, __u32 d, unsigned long adr)
- {
- __raw_writel(d, map->map_priv_1 + adr);
- mb();
- }
- void soleng_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
- {
- memcpy_fromio(to, map->map_priv_1 + from, len);
- }
- static struct mtd_info *flash_mtd;
- static struct mtd_info *eprom_mtd;
- static struct mtd_partition *parsed_parts;
- struct map_info soleng_eprom_map = {
- name: "Solution Engine EPROM",
- size: 0x400000,
- buswidth: 4,
- copy_from: soleng_copy_from,
- };
- struct map_info soleng_flash_map = {
- name: "Solution Engine FLASH",
- size: 0x400000,
- buswidth: 4,
- read32: soleng_read32,
- copy_from: soleng_copy_from,
- write32: soleng_write32,
- };
- #ifdef CONFIG_MTD_SUPERH_RESERVE
- static struct mtd_partition superh_se_partitions[] = {
- /* Reserved for boot code, read-only */
- {
- name: "flash_boot",
- offset: 0x00000000,
- size: CONFIG_MTD_SUPERH_RESERVE,
- mask_flags: MTD_WRITEABLE,
- },
- /* All else is writable (e.g. JFFS) */
- {
- name: "Flash FS",
- offset: MTDPART_OFS_NXTBLK,
- size: MTDPART_SIZ_FULL,
- }
- };
- #endif /* CONFIG_MTD_SUPERH_RESERVE */
- static int __init init_soleng_maps(void)
- {
- int nr_parts = 0;
- /* First probe at offset 0 */
- soleng_flash_map.map_priv_1 = P2SEGADDR(0);
- soleng_eprom_map.map_priv_1 = P1SEGADDR(0x01000000);
- printk(KERN_NOTICE "Probing for flash chips at 0x00000000:n");
- flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
- if (!flash_mtd) {
- /* Not there. Try swapping */
- printk(KERN_NOTICE "Probing for flash chips at 0x01000000:n");
- soleng_flash_map.map_priv_1 = P2SEGADDR(0x01000000);
- soleng_eprom_map.map_priv_1 = P1SEGADDR(0);
- flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
- if (!flash_mtd) {
- /* Eep. */
- printk(KERN_NOTICE "Flash chips not detected at either possible location.n");
- return -ENXIO;
- }
- }
- printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lxn",
- soleng_flash_map.map_priv_1 & 0x1fffffff,
- soleng_eprom_map.map_priv_1 & 0x1fffffff);
- flash_mtd->module = THIS_MODULE;
- eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
- if (eprom_mtd) {
- eprom_mtd->module = THIS_MODULE;
- add_mtd_device(eprom_mtd);
- }
- #ifdef CONFIG_MTD_REDBOOT_PARTS
- nr_parts = parse_redboot_partitions(flash_mtd, &parsed_parts);
- if (nr_parts > 0)
- printk(KERN_NOTICE "Found RedBoot partition table.n");
- else if (nr_parts < 0)
- printk(KERN_NOTICE "Error looking for RedBoot partitions.n");
- #endif /* CONFIG_MTD_REDBOOT_PARTS */
- #if CONFIG_MTD_SUPERH_RESERVE
- if (nr_parts == 0) {
- printk(KERN_NOTICE "Using configured partition at 0x%08x.n",
- CONFIG_MTD_SUPERH_RESERVE);
- parsed_parts = superh_se_partitions;
- nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
- }
- #endif /* CONFIG_MTD_SUPERH_RESERVE */
- if (nr_parts > 0)
- add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
- else
- add_mtd_device(flash_mtd);
- return 0;
- }
- static void __exit cleanup_soleng_maps(void)
- {
- if (eprom_mtd) {
- del_mtd_device(eprom_mtd);
- map_destroy(eprom_mtd);
- }
- if (parsed_parts)
- del_mtd_partitions(flash_mtd);
- else
- del_mtd_device(flash_mtd);
- map_destroy(flash_mtd);
- }
- module_init(init_soleng_maps);
- module_exit(cleanup_soleng_maps);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
- MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");