openwrt/target/linux/ifxmips/patches-2.6.30/140-mtd.patch

Index: linux-2.6.30.10/drivers/mtd/maps/Makefile
===================================================================
--- linux-2.6.30.10.orig/drivers/mtd/maps/Makefile	2009-12-04 07:00:07.000000000 +0100
+++ linux-2.6.30.10/drivers/mtd/maps/Makefile	2010-03-24 15:32:04.000000000 +0100
@@ -62,3 +62,4 @@
 obj-$(CONFIG_MTD_BFIN_ASYNC)	+= bfin-async-flash.o
 obj-$(CONFIG_MTD_RBTX4939)	+= rbtx4939-flash.o
 obj-$(CONFIG_MTD_VMU)		+= vmu-flash.o
+obj-$(CONFIG_MTD_IFXMIPS)  += ifxmips.o
Index: linux-2.6.30.10/drivers/mtd/maps/ifxmips.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.30.10/drivers/mtd/maps/ifxmips.c	2010-03-24 16:46:26.000000000 +0100
@@ -0,0 +1,282 @@
+/*
+ * 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) 2008 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/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 <linux/magic.h>
+#include <linux/platform_device.h>
+
+#include <ifxmips.h>
+#include <ifxmips_prom.h>
+#include <ifxmips_ebu.h>
+
+#ifndef CONFIG_MTD_PARTITIONS
+#error Please enable CONFIG_MTD_PARTITIONS
+#endif
+
+static struct map_info ifxmips_map = {
+	.name = "ifx-nor",
+	.bankwidth = 2,
+	.size = 0x400000,
+};
+
+static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
+{
+	unsigned long flags;
+	map_word temp;
+	spin_lock_irqsave(&ebu_lock, flags);
+	adr ^= 2;
+	temp.x[0] = *((__u16 *)(map->virt + adr));
+	spin_unlock_irqrestore(&ebu_lock, flags);
+	return temp;
+}
+
+static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&ebu_lock, flags);
+	adr ^= 2;
+	*((__u16 *)(map->virt + adr)) = d.x[0];
+	spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	unsigned char *p;
+	unsigned char *to_8;
+	unsigned long flags;
+	spin_lock_irqsave(&ebu_lock, flags);
+	from = (unsigned long)(from + map->virt);
+	p = (unsigned char *) from;
+	to_8 = (unsigned char *) to;
+	while (len--)
+		*to_8++ = *p++;
+	spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+void ifxmips_copy_to(struct map_info *map,
+		     unsigned long to,
+		     const void *from,
+		     ssize_t len)
+{
+	unsigned char *p =  (unsigned char *)from;
+	unsigned char *to_8;
+	unsigned long flags;
+	spin_lock_irqsave(&ebu_lock, flags);
+	to += (unsigned long) map->virt;
+	to_8 = (unsigned char *)to;
+	while (len--)
+		*p++ = *to_8++;
+	spin_unlock_irqrestore(&ebu_lock, flags);
+}
+
+static struct mtd_partition ifxmips_partitions[] = {
+	{
+		.name = "uboot",
+		.offset = 0x00000000,
+		.size = 0x00020000,
+	},
+	{
+		.name = "uboot_env",
+		.offset = 0x00020000,
+		.size = 0x0,
+	},
+	{
+		.name = "kernel",
+		.offset = 0x0,
+		.size = 0x0,
+	},
+	{
+		.name = "rootfs",
+		.offset = 0x0,
+		.size = 0x0,
+	},
+	{
+		.name = "board_config",
+		.offset = 0x0,
+		.size = 0x0,
+	},
+};
+
+static struct mtd_partition ifxmips_meta_partition = {
+	.name = "linux",
+	.offset = 0x00030000,
+	.size = 0x0,
+};
+
+static const char *part_probe_types[] = { "cmdlinepart", NULL };
+
+int find_uImage_size(unsigned long start_offset)
+{
+	unsigned long magic;
+	unsigned long temp;
+	ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
+	if (le32_to_cpu(magic) != 0x56190527) {
+		printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset);
+		return 0;
+	}
+	ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
+	printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
+	return temp + 0x40;
+}
+
+int find_brn_block(unsigned long start_offset)
+{
+	unsigned char temp[9];
+	ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
+	temp[8] = '\0';
+	printk(KERN_INFO "data in brn block %s\n", temp);
+	if (memcmp(temp, "BRN-BOOT", 8) == 0)
+		return 1;
+	else
+		return 0;
+}
+
+int detect_squashfs_partition(unsigned long start_offset)
+{
+	unsigned long temp;
+	ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
+	return le32_to_cpu(temp) == SQUASHFS_MAGIC;
+}
+
+static int ifxmips_mtd_probe(struct platform_device *dev)
+{
+	struct mtd_info *ifxmips_mtd = NULL;
+	struct mtd_partition *parts = NULL;
+	unsigned long uimage_size;
+	int err, i;
+	int kernel_part = 2, rootfs_part = 3;
+	int num_parts = ARRAY_SIZE(ifxmips_partitions);
+
+	ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
+
+	ifxmips_map.read = ifxmips_read16;
+	ifxmips_map.write = ifxmips_write16;
+	ifxmips_map.copy_from = ifxmips_copy_from;
+	ifxmips_map.copy_to = ifxmips_copy_to;
+	ifxmips_map.phys = dev->resource->start;
+	ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
+	ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
+
+	if (!ifxmips_map.virt) {
+		printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
+		return -EIO;
+	}
+
+	ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
+	if (!ifxmips_mtd) {
+		iounmap(ifxmips_map.virt);
+		printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
+		return -ENXIO;
+	}
+
+	ifxmips_mtd->owner = THIS_MODULE;
+
+	err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
+	if (err > 0) {
+		printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
+		num_parts = err;
+		kernel_part = 0;
+		rootfs_part = 0;
+		for (i = 0; i < num_parts; i++) {
+			if (strcmp(parts[i].name, "kernel") == 0)
+				kernel_part = i;
+			if (strcmp(parts[i].name, "rootfs") == 0)
+				rootfs_part = i;
+		}
+	} else {
+		/* if the flash is 64k sectors, the kernel will reside at 0xb0030000
+		   if the flash is 128k sectors, the kernel will reside at 0xb0040000 */
+		ifxmips_partitions[1].size = ifxmips_mtd->erasesize;
+		ifxmips_partitions[2].offset = ifxmips_partitions[1].offset + ifxmips_mtd->erasesize;
+		parts = &ifxmips_partitions[0];
+	}
+
+	/* dynamic size detection only if rootfs-part follows kernel-part */
+	if (kernel_part+1 == rootfs_part) {
+		uimage_size = find_uImage_size(parts[kernel_part].offset);
+
+		if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
+			printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
+		} else {
+			uimage_size &= ~(ifxmips_mtd->erasesize -1);
+			uimage_size += ifxmips_mtd->erasesize;
+		}
+
+		parts[kernel_part].size = uimage_size;
+		parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
+		parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
+
+		ifxmips_meta_partition.offset = parts[kernel_part].offset;
+		ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
+	}
+
+	if (err <= 0) {
+		if (ifxmips_has_brn_block()) {
+			parts[3].size -= ifxmips_mtd->erasesize;
+			parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
+			parts[4].size = ifxmips_mtd->erasesize;
+			ifxmips_meta_partition.size -= ifxmips_mtd->erasesize;
+		} else {
+			num_parts--;
+		}
+	}
+
+	add_mtd_partitions(ifxmips_mtd, parts, num_parts);
+	add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
+
+	printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
+		ifxmips_map.name, ((int)ifxmips_mtd->size) >> 20);
+	return 0;
+}
+
+static struct platform_driver ifxmips_mtd_driver = {
+	.probe = ifxmips_mtd_probe,
+	.driver = {
+		.name = "ifxmips_mtd",
+		.owner = THIS_MODULE,
+	},
+};
+
+int __init init_ifxmips_mtd(void)
+{
+	int ret = platform_driver_register(&ifxmips_mtd_driver);
+	if (ret)
+		printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
+	return ret;
+}
+
+static void __exit cleanup_ifxmips_mtd(void)
+{
+	platform_driver_unregister(&ifxmips_mtd_driver);
+}
+
+module_init(init_ifxmips_mtd);
+module_exit(cleanup_ifxmips_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");