mirror of https://gitee.com/openkylin/linux.git
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
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* Flash memory access on Hynix GMS30C7201/HMS30C7202 based
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* evaluation boards
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*
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* $Id: h720x-flash.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
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*
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* (C) 2002 Jungjun Kim <jungjun.kim@hynix.com>
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* 2003 Thomas Gleixner <tglx@linutronix.de>
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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 <linux/errno.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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static struct mtd_info *mymtd;
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static struct map_info h720x_map = {
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.name = "H720X",
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.bankwidth = 4,
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.size = FLASH_SIZE,
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.phys = FLASH_PHYS,
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};
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static struct mtd_partition h720x_partitions[] = {
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{
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.name = "ArMon",
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.size = 0x00080000,
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.offset = 0,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "Env",
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.size = 0x00040000,
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.offset = 0x00080000,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "Kernel",
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.size = 0x00180000,
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.offset = 0x000c0000,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "Ramdisk",
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.size = 0x00400000,
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.offset = 0x00240000,
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.mask_flags = MTD_WRITEABLE
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},{
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.name = "jffs2",
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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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#define NUM_PARTITIONS ARRAY_SIZE(h720x_partitions)
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static int nr_mtd_parts;
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static struct mtd_partition *mtd_parts;
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static const char *probes[] = { "cmdlinepart", NULL };
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/*
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* Initialize FLASH support
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*/
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int __init h720x_mtd_init(void)
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{
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char *part_type = NULL;
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h720x_map.virt = ioremap(FLASH_PHYS, FLASH_SIZE);
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if (!h720x_map.virt) {
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printk(KERN_ERR "H720x-MTD: ioremap failed\n");
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return -EIO;
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}
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simple_map_init(&h720x_map);
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// Probe for flash bankwidth 4
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printk (KERN_INFO "H720x-MTD probing 32bit FLASH\n");
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mymtd = do_map_probe("cfi_probe", &h720x_map);
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if (!mymtd) {
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printk (KERN_INFO "H720x-MTD probing 16bit FLASH\n");
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// Probe for bankwidth 2
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h720x_map.bankwidth = 2;
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mymtd = do_map_probe("cfi_probe", &h720x_map);
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}
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if (mymtd) {
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mymtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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nr_mtd_parts = parse_mtd_partitions(mymtd, probes, &mtd_parts, 0);
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if (nr_mtd_parts > 0)
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part_type = "command line";
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#endif
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if (nr_mtd_parts <= 0) {
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mtd_parts = h720x_partitions;
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nr_mtd_parts = NUM_PARTITIONS;
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part_type = "builtin";
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}
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printk(KERN_INFO "Using %s partition table\n", part_type);
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add_mtd_partitions(mymtd, mtd_parts, nr_mtd_parts);
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return 0;
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}
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iounmap((void *)h720x_map.virt);
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return -ENXIO;
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}
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/*
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* Cleanup
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*/
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static void __exit h720x_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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}
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/* Free partition info, if commandline partition was used */
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if (mtd_parts && (mtd_parts != h720x_partitions))
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kfree (mtd_parts);
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if (h720x_map.virt) {
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iounmap((void *)h720x_map.virt);
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h720x_map.virt = 0;
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}
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}
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module_init(h720x_mtd_init);
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module_exit(h720x_mtd_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
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MODULE_DESCRIPTION("MTD map driver for Hynix evaluation boards");
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