more danube 2 ifxmips transitions

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9826 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ifxmips/files/drivers/mtd/maps/ifxmips.c

@@ -0,0 +1,194 @@
+/*
+ *  Driver for IFXMIPS flashmap 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/cfi.h>
+#include <asm/danube/danube.h>
+#include <linux/magic.h>
+
+static struct map_info
+danube_map = {
+	.name = "IFXMIPS_FLASH",
+	.bankwidth = 2,
+	.size = 0x400000,
+};
+
+static map_word
+danube_read16 (struct map_info * map, unsigned long adr)
+{
+	map_word temp;
+
+	adr ^= 2;
+	temp.x[0] = *((__u16 *) (map->virt + adr));
+
+	return temp;
+}
+
+static void
+danube_write16 (struct map_info *map, map_word d, unsigned long adr)
+{
+	adr ^= 2;
+	*((__u16 *) (map->virt + adr)) = d.x[0];
+}
+
+void
+danube_copy_from (struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	u8 *p;
+	u8 *to_8;
+
+	from = (unsigned long) (from + map->virt);
+	p = (u8 *) from;
+	to_8 = (u8 *) to;
+	while(len--){
+		*to_8++ = *p++;
+	}
+}
+
+void
+danube_copy_to (struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	u8 *p =  (u8*) from;
+	u8 *to_8;
+
+	to += (unsigned long) map->virt;
+	to_8 = (u8*)to;
+	while(len--){
+		*p++ = *to_8++;
+	}
+}
+
+static struct mtd_partition
+danube_partitions[4] = {
+	{
+		name:"U-Boot",
+		offset:0x00000000,
+		size:0x00020000,
+	},
+	{
+		name:"U-Boot-Env",
+		offset:0x00020000,
+		size:0x00010000,
+	},
+	{
+		name:"kernel",
+		offset:0x00030000,
+		size:0x0,
+	},
+	{
+		name:"rootfs",
+		offset:0x0,
+		size:0x0,
+	},
+};
+
+#define IFXMIPS_FLASH_START		0x10000000
+#define IFXMIPS_FLASH_MAX		0x2000000
+
+int
+find_uImage_size (unsigned long start_offset){
+	unsigned long temp;
+
+	danube_copy_from(&danube_map, &temp, start_offset + 12, 4);
+	printk("kernel size is %ld \n", temp + 0x40);
+	return temp + 0x40;
+}
+
+int
+detect_squashfs_partition (unsigned long start_offset){
+	unsigned long temp;
+
+	danube_copy_from(&danube_map, &temp, start_offset, 4);
+
+	return (temp == SQUASHFS_MAGIC);
+}
+
+int __init
+init_danube_mtd (void)
+{
+	struct mtd_info *danube_mtd = NULL;
+	struct mtd_partition *parts = NULL;
+	unsigned long uimage_size;
+
+	writel(0x1d7ff, IFXMIPS_EBU_BUSCON0);
+
+	danube_map.read = danube_read16;
+	danube_map.write = danube_write16;
+	danube_map.copy_from = danube_copy_from;
+	danube_map.copy_to = danube_copy_to;
+
+	danube_map.phys = IFXMIPS_FLASH_START;
+	danube_map.virt = ioremap_nocache(IFXMIPS_FLASH_START, IFXMIPS_FLASH_MAX);
+	danube_map.size = IFXMIPS_FLASH_MAX;
+	if (!danube_map.virt) {
+		printk(KERN_WARNING "Failed to ioremap!\n");
+		return -EIO;
+	}
+
+	danube_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &danube_map);
+	if (!danube_mtd) {
+		iounmap(danube_map.virt);
+		printk("probing failed\n");
+		return -ENXIO;
+	}
+
+	danube_mtd->owner = THIS_MODULE;
+
+	uimage_size = find_uImage_size(danube_partitions[2].offset);
+
+	if(detect_squashfs_partition(danube_partitions[2].offset + uimage_size)){
+		printk("Found a squashfs following the uImage\n");
+	} else {
+		uimage_size &= ~0xffff;
+		uimage_size += 0x10000;
+	}
+
+	danube_partitions[2].size = uimage_size;
+	danube_partitions[3].offset = danube_partitions[2].offset + danube_partitions[2].size;
+	danube_partitions[3].size = ((danube_mtd->size >> 20) * 1024 * 1024) - danube_partitions[3].offset;
+
+	parts = &danube_partitions[0];
+	add_mtd_partitions(danube_mtd, parts, 4);
+
+	printk("Added danube flash with %dMB\n", danube_mtd->size >> 20);
+	return 0;
+}
+
+static void
+__exit
+cleanup_danube_mtd (void)
+{
+}
+
+module_init (init_danube_mtd);
+module_exit (cleanup_danube_mtd);
+
+MODULE_LICENSE ("GPL");
+MODULE_AUTHOR ("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION ("MTD map driver for IFXMIPS boards");