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authorGabor Juhos <juhosg@openwrt.org>2008-08-07 13:50:02 +0000
committerGabor Juhos <juhosg@openwrt.org>2008-08-07 13:50:02 +0000
commit42c075c401b6a165b6fde371c0a81d894b9bf13f (patch)
tree8a9c734b41c7fefe6035e0c092a559ae30a2b0df /target/linux/adm5120/files-2.6.26/drivers/mtd
parent10dd170af6d9730ff2107abd6def362ddf74a4b9 (diff)
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[adm5120] add 2.6.26 specific files
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12239 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/adm5120/files-2.6.26/drivers/mtd')
-rw-r--r--target/linux/adm5120/files-2.6.26/drivers/mtd/maps/adm5120-flash.c568
-rw-r--r--target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c164
-rw-r--r--target/linux/adm5120/files-2.6.26/drivers/mtd/trxsplit.c217
3 files changed, 949 insertions, 0 deletions
diff --git a/target/linux/adm5120/files-2.6.26/drivers/mtd/maps/adm5120-flash.c b/target/linux/adm5120/files-2.6.26/drivers/mtd/maps/adm5120-flash.c
new file mode 100644
index 0000000000..8bd7ae1c0b
--- /dev/null
+++ b/target/linux/adm5120/files-2.6.26/drivers/mtd/maps/adm5120-flash.c
@@ -0,0 +1,568 @@
+/*
+ * Platform driver for NOR flash devices on ADM5120 based boards
+ *
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file was derived from: drivers/mtd/map/physmap.c
+ * Copyright (C) 2003 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/mach-adm5120/adm5120_defs.h>
+#include <asm/mach-adm5120/adm5120_switch.h>
+#include <asm/mach-adm5120/adm5120_mpmc.h>
+#include <asm/mach-adm5120/adm5120_platform.h>
+
+#define DRV_NAME "adm5120-flash"
+#define DRV_DESC "ADM5120 flash MAP driver"
+#define MAX_PARSED_PARTS 8
+
+#ifdef ADM5120_FLASH_DEBUG
+#define MAP_DBG(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
+#else
+#define MAP_DBG(m, f, a...) do {} while (0)
+#endif
+#define MAP_ERR(m, f, a...) printk(KERN_ERR "%s: " f, (m->name) , ## a)
+#define MAP_INFO(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
+
+struct adm5120_map_info {
+ struct map_info map;
+ void (*switch_bank)(unsigned);
+ unsigned long window_size;
+};
+
+struct adm5120_flash_info {
+ struct mtd_info *mtd;
+ struct resource *res;
+ struct platform_device *dev;
+ struct adm5120_map_info amap;
+#ifdef CONFIG_MTD_PARTITIONS
+ int nr_parts;
+ struct mtd_partition *parts[MAX_PARSED_PARTS];
+#endif
+};
+
+struct flash_desc {
+ u32 phys;
+ u32 srs_shift;
+};
+
+/*
+ * Globals
+ */
+static DEFINE_SPINLOCK(adm5120_flash_spin);
+#define FLASH_LOCK() spin_lock(&adm5120_flash_spin)
+#define FLASH_UNLOCK() spin_unlock(&adm5120_flash_spin)
+
+static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };
+
+static u32 flash_sizes[8] = {
+ 0, 512*1024, 1024*1024, 2*1024*1024,
+ 4*1024*1024, 0, 0, 0
+};
+
+static struct flash_desc flash_descs[2] = {
+ {
+ .phys = ADM5120_SRAM0_BASE,
+ .srs_shift = MEMCTRL_SRS0_SHIFT,
+ }, {
+ .phys = ADM5120_SRAM1_BASE,
+ .srs_shift = MEMCTRL_SRS1_SHIFT,
+ }
+};
+
+static const char *probe_types[] = {
+ "cfi_probe",
+ "jedec_probe",
+ "map_rom",
+ NULL
+};
+
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *parse_types[] = {
+ "cmdlinepart",
+#ifdef CONFIG_MTD_REDBOOT_PARTS
+ "RedBoot",
+#endif
+#ifdef CONFIG_MTD_MYLOADER_PARTS
+ "MyLoader",
+#endif
+};
+#endif
+
+#define BANK_SIZE (2<<20)
+#define BANK_SIZE_MAX (4<<20)
+#define BANK_OFFS_MASK (BANK_SIZE-1)
+#define BANK_START_MASK (~BANK_OFFS_MASK)
+
+static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
+{
+ return (struct adm5120_map_info *)map;
+}
+
+static void adm5120_flash_switchbank(struct map_info *map,
+ unsigned long ofs)
+{
+ struct adm5120_map_info *amap = map_to_amap(map);
+ unsigned bank;
+
+ if (amap->switch_bank == NULL)
+ return;
+
+ bank = (ofs & BANK_START_MASK) >> 21;
+ if (bank > 1)
+ BUG();
+
+ MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
+ amap->switch_bank(bank);
+}
+
+static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
+{
+ struct adm5120_map_info *amap = map_to_amap(map);
+ map_word ret;
+
+ MAP_DBG(map, "reading from ofs %lX\n", ofs);
+
+ if (ofs >= amap->window_size)
+ return map_word_ff(map);
+
+ FLASH_LOCK();
+ adm5120_flash_switchbank(map, ofs);
+ ret = inline_map_read(map, (ofs & (amap->window_size-1)));
+ FLASH_UNLOCK();
+
+ return ret;
+}
+
+static void adm5120_flash_write(struct map_info *map, const map_word datum,
+ unsigned long ofs)
+{
+ struct adm5120_map_info *amap = map_to_amap(map);
+
+ MAP_DBG(map, "writing to ofs %lX\n", ofs);
+
+ if (ofs > amap->window_size)
+ return;
+
+ FLASH_LOCK();
+ adm5120_flash_switchbank(map, ofs);
+ inline_map_write(map, datum, (ofs & (amap->window_size-1)));
+ FLASH_UNLOCK();
+}
+
+static void adm5120_flash_copy_from(struct map_info *map, void *to,
+ unsigned long from, ssize_t len)
+{
+ struct adm5120_map_info *amap = map_to_amap(map);
+ char *p;
+ ssize_t t;
+
+ MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
+ (unsigned long)to, from, (unsigned long)len);
+
+ if (from > amap->window_size)
+ return;
+
+ p = (char *)to;
+ while (len > 0) {
+ t = len;
+ if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
+ t = BANK_SIZE-from;
+
+ FLASH_LOCK();
+ MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
+ (unsigned long)t, (from & (amap->window_size-1)),
+ (unsigned long)p);
+ adm5120_flash_switchbank(map, from);
+ inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
+ FLASH_UNLOCK();
+ p += t;
+ from += t;
+ len -= t;
+ }
+}
+
+static int adm5120_flash_initres(struct adm5120_flash_info *info)
+{
+ struct map_info *map = &info->amap.map;
+ int err = 0;
+
+ info->res = request_mem_region(map->phys, info->amap.window_size,
+ map->name);
+ if (info->res == NULL) {
+ MAP_ERR(map, "could not reserve memory region\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ map->virt = ioremap_nocache(map->phys, info->amap.window_size);
+ if (map->virt == NULL) {
+ MAP_ERR(map, "failed to ioremap flash region\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+out:
+ return err;
+}
+
+static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
+ struct platform_device *dev)
+{
+ struct map_info *map = &info->amap.map;
+ struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
+ struct flash_desc *fdesc;
+ u32 t = 0;
+
+ map->name = dev->dev.bus_id;
+
+ if (dev->id > 1) {
+ MAP_ERR(map, "invalid flash id\n");
+ goto err_out;
+ }
+
+ fdesc = &flash_descs[dev->id];
+
+ if (pdata)
+ info->amap.window_size = pdata->window_size;
+
+ if (info->amap.window_size == 0) {
+ /* get memory window size */
+ t = SW_READ_REG(SWITCH_REG_MEMCTRL) >> fdesc->srs_shift;
+ t &= MEMCTRL_SRS_MASK;
+ info->amap.window_size = flash_sizes[t];
+ }
+
+ if (info->amap.window_size == 0) {
+ MAP_ERR(map, "unable to determine window size\n");
+ goto err_out;
+ }
+
+ /* get flash bus width */
+ switch (dev->id) {
+ case 0:
+ t = MPMC_READ_REG(SC1) & SC_MW_MASK;
+ break;
+ case 1:
+ t = MPMC_READ_REG(SC0) & SC_MW_MASK;
+ break;
+ }
+ map->bankwidth = flash_bankwidths[t];
+ if (map->bankwidth == 0) {
+ MAP_ERR(map, "invalid bus width detected\n");
+ goto err_out;
+ }
+
+ map->phys = fdesc->phys;
+ map->size = BANK_SIZE_MAX;
+
+ simple_map_init(map);
+ map->read = adm5120_flash_read;
+ map->write = adm5120_flash_write;
+ map->copy_from = adm5120_flash_copy_from;
+
+ if (pdata) {
+ map->set_vpp = pdata->set_vpp;
+ info->amap.switch_bank = pdata->switch_bank;
+ }
+
+ info->dev = dev;
+
+ MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
+ (unsigned long)map->phys,
+ (unsigned long)info->amap.window_size >> 10,
+ map->bankwidth*8);
+
+ return 0;
+
+err_out:
+ return -ENODEV;
+}
+
+static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
+{
+ struct map_info *map = &info->amap.map;
+
+ if (info->mtd->size <= BANK_SIZE)
+ /* no bank switching needed */
+ return;
+
+ if (info->amap.switch_bank) {
+ info->amap.window_size = info->mtd->size;
+ return;
+ }
+
+ MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
+ (unsigned long)map->size >> 10,
+ (unsigned long)info->mtd->size >> 10);
+
+ info->mtd->size = info->amap.window_size;
+}
+
+#ifdef CONFIG_MTD_PARTITIONS
+static int adm5120_flash_initparts(struct adm5120_flash_info *info)
+{
+ struct adm5120_flash_platform_data *pdata;
+ struct map_info *map = &info->amap.map;
+ int num_parsers;
+ const char *parser[2];
+ int err = 0;
+ int nr_parts;
+ int i;
+
+ info->nr_parts = 0;
+
+ pdata = info->dev->dev.platform_data;
+ if (pdata == NULL)
+ goto out;
+
+ if (pdata->nr_parts) {
+ MAP_INFO(map, "adding static partitions\n");
+ err = add_mtd_partitions(info->mtd, pdata->parts,
+ pdata->nr_parts);
+ if (err == 0) {
+ info->nr_parts += pdata->nr_parts;
+ goto out;
+ }
+ }
+
+ num_parsers = ARRAY_SIZE(parse_types);
+ if (num_parsers > MAX_PARSED_PARTS)
+ num_parsers = MAX_PARSED_PARTS;
+
+ parser[1] = NULL;
+ for (i = 0; i < num_parsers; i++) {
+ parser[0] = parse_types[i];
+
+ MAP_INFO(map, "parsing \"%s\" partitions\n",
+ parser[0]);
+ nr_parts = parse_mtd_partitions(info->mtd, parser,
+ &info->parts[i], 0);
+
+ if (nr_parts <= 0)
+ continue;
+
+ MAP_INFO(map, "adding \"%s\" partitions\n",
+ parser[0]);
+
+ err = add_mtd_partitions(info->mtd, info->parts[i], nr_parts);
+ if (err)
+ break;
+
+ info->nr_parts += nr_parts;
+ }
+out:
+ return err;
+}
+#else
+static int adm5120_flash_initparts(struct adm5120_flash_info *info)
+{
+ return 0;
+}
+#endif /* CONFIG_MTD_PARTITIONS */
+
+#ifdef CONFIG_MTD_PARTITIONS
+static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
+{
+ int i;
+
+ if (info->nr_parts) {
+ del_mtd_partitions(info->mtd);
+ for (i = 0; i < MAX_PARSED_PARTS; i++)
+ if (info->parts[i] != NULL)
+ kfree(info->parts[i]);
+ } else {
+ del_mtd_device(info->mtd);
+ }
+}
+#else
+static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
+{
+ del_mtd_device(info->mtd);
+}
+#endif
+
+static int adm5120_flash_remove(struct platform_device *dev)
+{
+ struct adm5120_flash_info *info;
+
+ info = platform_get_drvdata(dev);
+ if (info == NULL)
+ return 0;
+
+ platform_set_drvdata(dev, NULL);
+
+ if (info->mtd != NULL) {
+ adm5120_flash_remove_mtd(info);
+ map_destroy(info->mtd);
+ }
+
+ if (info->amap.map.virt != NULL)
+ iounmap(info->amap.map.virt);
+
+ if (info->res != NULL) {
+ release_resource(info->res);
+ kfree(info->res);
+ }
+
+ return 0;
+}
+
+static int adm5120_flash_probe(struct platform_device *dev)
+{
+ struct adm5120_flash_info *info;
+ struct map_info *map;
+ const char **probe_type;
+ int err;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ platform_set_drvdata(dev, info);
+
+ err = adm5120_flash_initinfo(info, dev);
+ if (err)
+ goto err_out;
+
+ err = adm5120_flash_initres(info);
+ if (err)
+ goto err_out;
+
+ map = &info->amap.map;
+ for (probe_type = probe_types; info->mtd == NULL && *probe_type != NULL;
+ probe_type++)
+ info->mtd = do_map_probe(*probe_type, map);
+
+ if (info->mtd == NULL) {
+ MAP_ERR(map, "map_probe failed\n");
+ err = -ENXIO;
+ goto err_out;
+ }
+
+ adm5120_flash_initbanks(info);
+
+ if (info->mtd->size < info->amap.window_size) {
+ /* readjust resources */
+ iounmap(map->virt);
+ release_resource(info->res);
+ kfree(info->res);
+
+ info->amap.window_size = info->mtd->size;
+ map->size = info->mtd->size;
+ MAP_INFO(map, "reducing map size to %ldKiB\n",
+ (unsigned long)map->size >> 10);
+ err = adm5120_flash_initres(info);
+ if (err)
+ goto err_out;
+ }
+
+ MAP_INFO(map, "found at 0x%lX, size:%ldKiB, width:%d bits\n",
+ (unsigned long)map->phys, (unsigned long)info->mtd->size >> 10,
+ map->bankwidth*8);
+
+ info->mtd->owner = THIS_MODULE;
+
+ err = adm5120_flash_initparts(info);
+ if (err)
+ goto err_out;
+
+ if (info->nr_parts == 0) {
+ MAP_INFO(map, "no partitions available, registering "
+ "whole flash\n");
+ add_mtd_device(info->mtd);
+ }
+
+ return 0;
+
+err_out:
+ adm5120_flash_remove(dev);
+ return err;
+}
+
+#ifdef CONFIG_PM
+static int adm5120_flash_suspend(struct platform_device *dev,
+ pm_message_t state)
+{
+ struct adm5120_flash_info *info = platform_get_drvdata(dev);
+ int ret = 0;
+
+ if (info)
+ ret = info->mtd->suspend(info->mtd);
+
+ return ret;
+}
+
+static int adm5120_flash_resume(struct platform_device *dev)
+{
+ struct adm5120_flash_info *info = platform_get_drvdata(dev);
+
+ if (info)
+ info->mtd->resume(info->mtd);
+
+ return 0;
+}
+
+static void adm5120_flash_shutdown(struct platform_device *dev)
+{
+ struct adm5120_flash_info *info = platform_get_drvdata(dev);
+
+ if (info && info->mtd->suspend(info->mtd) == 0)
+ info->mtd->resume(info->mtd);
+}
+#endif
+
+static struct platform_driver adm5120_flash_driver = {
+ .probe = adm5120_flash_probe,
+ .remove = adm5120_flash_remove,
+#ifdef CONFIG_PM
+ .suspend = adm5120_flash_suspend,
+ .resume = adm5120_flash_resume,
+ .shutdown = adm5120_flash_shutdown,
+#endif
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init adm5120_flash_init(void)
+{
+ int err;
+
+ err = platform_driver_register(&adm5120_flash_driver);
+
+ return err;
+}
+
+static void __exit adm5120_flash_exit(void)
+{
+ platform_driver_unregister(&adm5120_flash_driver);
+}
+
+module_init(adm5120_flash_init);
+module_exit(adm5120_flash_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c b/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c
new file mode 100644
index 0000000000..22d076b72c
--- /dev/null
+++ b/target/linux/adm5120/files-2.6.26/drivers/mtd/myloader.c
@@ -0,0 +1,164 @@
+/*
+ * Parse MyLoader-style flash partition tables and produce a Linux partition
+ * array to match.
+ *
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file was based on drivers/mtd/redboot.c
+ * Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/byteorder/generic.h>
+
+#include <prom/myloader.h>
+
+#define NAME_LEN_MAX 20
+#define NAME_MYLOADER "MyLoader"
+#define NAME_PARTITION_TABLE "Partition Table"
+#define BLOCK_LEN_MIN 0x10000
+
+int parse_myloader_partitions(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ unsigned long origin)
+{
+ struct mylo_partition_table *tab;
+ struct mylo_partition *part;
+ struct mtd_partition *mtd_parts;
+ struct mtd_partition *mtd_part;
+ int num_parts;
+ int ret, i;
+ size_t retlen;
+ char *names;
+ unsigned long offset;
+ unsigned long blocklen;
+
+ tab = vmalloc(sizeof(*tab));
+ if (!tab) {
+ return -ENOMEM;
+ goto out;
+ }
+
+ blocklen = master->erasesize;
+ if (blocklen < BLOCK_LEN_MIN)
+ blocklen = BLOCK_LEN_MIN;
+
+ /* Partition Table is always located on the second erase block */
+ offset = blocklen;
+ printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
+ "offset 0x%lx\n", master->name, offset);
+
+ ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
+ if (ret)
+ goto out;
+
+ if (retlen != sizeof(*tab)) {
+ ret = -EIO;
+ goto out_free_buf;
+ }
+
+ /* Check for Partition Table magic number */
+ if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
+ printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
+ master->name);
+ ret = 0;
+ goto out_free_buf;
+ }
+
+ /* The MyLoader and the Partition Table is always present */
+ num_parts = 2;
+
+ /* Detect number of used partitions */
+ for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+ part = &tab->partitions[i];
+
+ if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+ continue;
+
+ num_parts++;
+ }
+
+ mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
+ num_parts * NAME_LEN_MAX), GFP_KERNEL);
+
+ if (!mtd_parts) {
+ ret = -ENOMEM;
+ goto out_free_buf;
+ }
+
+ mtd_part = mtd_parts;
+ names = (char *)&mtd_parts[num_parts];
+
+ strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
+ mtd_part->name = names;
+ mtd_part->offset = 0;
+ mtd_part->size = blocklen;
+ mtd_part->mask_flags = MTD_WRITEABLE;
+ mtd_part++;
+ names += NAME_LEN_MAX;
+
+ strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
+ mtd_part->name = names;
+ mtd_part->offset = blocklen;
+ mtd_part->size = blocklen;
+ mtd_part->mask_flags = MTD_WRITEABLE;
+ mtd_part++;
+ names += NAME_LEN_MAX;
+
+ for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+ part = &tab->partitions[i];
+
+ if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+ continue;
+
+ sprintf(names, "partition%d", i);
+ mtd_part->offset = le32_to_cpu(part->addr);
+ mtd_part->size = le32_to_cpu(part->size);
+ mtd_part->name = names;
+ mtd_part++;
+ names += NAME_LEN_MAX;
+ }
+
+ *pparts = mtd_parts;
+ ret = num_parts;
+
+out_free_buf:
+ vfree(tab);
+out:
+ return ret;
+}
+
+static struct mtd_part_parser mylo_mtd_parser = {
+ .owner = THIS_MODULE,
+ .parse_fn = parse_myloader_partitions,
+ .name = NAME_MYLOADER,
+};
+
+static int __init mylo_mtd_parser_init(void)
+{
+ return register_mtd_parser(&mylo_mtd_parser);
+}
+
+static void __exit mylo_mtd_parser_exit(void)
+{
+ deregister_mtd_parser(&mylo_mtd_parser);
+}
+
+module_init(mylo_mtd_parser_init);
+module_exit(mylo_mtd_parser_exit);
+
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
+MODULE_LICENSE("GPL v2");
diff --git a/target/linux/adm5120/files-2.6.26/drivers/mtd/trxsplit.c b/target/linux/adm5120/files-2.6.26/drivers/mtd/trxsplit.c
new file mode 100644
index 0000000000..7e4a63b74b
--- /dev/null
+++ b/target/linux/adm5120/files-2.6.26/drivers/mtd/trxsplit.c
@@ -0,0 +1,217 @@
+/*
+ * Copyright (C) Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/kmod.h>
+#include <linux/root_dev.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/byteorder/generic.h>
+
+#define PFX "trxsplit: "
+
+#define TRX_MAGIC 0x30524448 /* "HDR0" */
+#define TRX_VERSION 1
+#define TRX_MAX_LEN 0x3A0000
+#define TRX_NO_HEADER 0x1 /* do not write TRX header */
+#define TRX_GZ_FILES 0x2 /* contains individual gzip files */
+#define TRX_MAX_OFFSET 3
+#define TRX_MIN_KERNEL_SIZE 256*1024
+
+struct trx_header {
+ u32 magic; /* "HDR0" */
+ u32 len; /* Length of file including header */
+ u32 crc32; /* 32-bit CRC from flag_version to end of file */
+ u32 flag_version; /* 0:15 flags, 16:31 version */
+ u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions */
+};
+
+#define TRX_ALIGN 0x1000
+
+static int trx_nr_parts;
+static unsigned long trx_offset;
+static struct mtd_info *trx_mtd;
+static struct mtd_partition trx_parts[TRX_MAX_OFFSET];
+static struct trx_header trx_hdr;
+
+static int trxsplit_refresh_partitions(struct mtd_info *mtd);
+
+static int trxsplit_checktrx(struct mtd_info *mtd, unsigned long offset)
+{
+ size_t retlen;
+ int err;
+
+ err = mtd->read(mtd, offset, sizeof(trx_hdr), &retlen,
+ (void *)&trx_hdr);
+ if (err) {
+ printk(KERN_ALERT PFX "unable to read from '%s'\n", mtd->name);
+ goto err_out;
+ }
+
+ if (retlen != sizeof(trx_hdr)) {
+ printk(KERN_ALERT PFX "reading failed on '%s'\n", mtd->name);
+ goto err_out;
+ }
+
+ trx_hdr.magic = le32_to_cpu(trx_hdr.magic);
+ trx_hdr.len = le32_to_cpu(trx_hdr.len);
+ trx_hdr.crc32 = le32_to_cpu(trx_hdr.crc32);
+ trx_hdr.flag_version = le32_to_cpu(trx_hdr.flag_version);
+ trx_hdr.offsets[0] = le32_to_cpu(trx_hdr.offsets[0]);
+ trx_hdr.offsets[1] = le32_to_cpu(trx_hdr.offsets[1]);
+ trx_hdr.offsets[2] = le32_to_cpu(trx_hdr.offsets[2]);
+
+ /* sanity checks */
+ if (trx_hdr.magic != TRX_MAGIC)
+ goto err_out;
+
+ if (trx_hdr.len > mtd->size - offset)
+ goto err_out;
+
+ /* TODO: add crc32 checking too? */
+
+ return 0;
+
+err_out:
+ return -1;
+}
+
+static void trxsplit_findtrx(struct mtd_info *mtd)
+{
+ unsigned long offset;
+ int err;
+
+ printk(KERN_INFO PFX "searching TRX header in '%s'\n", mtd->name);
+
+ err = 0;
+ for (offset = 0; offset < mtd->size; offset += TRX_ALIGN) {
+ err = trxsplit_checktrx(mtd, offset);
+ if (err == 0)
+ break;
+ }
+
+ if (err)
+ return;
+
+ printk(KERN_INFO PFX "TRX header found at 0x%lX\n", offset);
+
+ trx_mtd = mtd;
+ trx_offset = offset;
+}
+
+static void trxsplit_create_partitions(struct mtd_info *mtd)
+{
+ struct mtd_partition *part = trx_parts;
+ int err;
+ int i;
+
+ for (i = 0; i < TRX_MAX_OFFSET; i++) {
+ part = &trx_parts[i];
+ if (trx_hdr.offsets[i] == 0)
+ continue;
+ part->offset = trx_offset + trx_hdr.offsets[i];
+ trx_nr_parts++;
+ }
+
+ for (i = 0; i < trx_nr_parts-1; i++)
+ trx_parts[i].size = trx_parts[i+1].offset - trx_parts[i].offset;
+
+ trx_parts[i].size = mtd->size - trx_parts[i].offset;
+
+ i = 0;
+ part = &trx_parts[i];
+ if (part->size < TRX_MIN_KERNEL_SIZE) {
+ part->name = "loader";
+ i++;
+ }
+
+ part = &trx_parts[i];
+ part->name = "kernel";
+ i++;
+
+ part = &trx_parts[i];
+ part->name = "rootfs";
+
+ err = add_mtd_partitions(mtd, trx_parts, trx_nr_parts);
+ if (err) {
+ printk(KERN_ALERT PFX "adding TRX partitions failed\n");
+ return;
+ }
+
+ mtd->refresh_device = trxsplit_refresh_partitions;
+}
+
+static int trxsplit_refresh_partitions(struct mtd_info *mtd)
+{
+ printk(KERN_INFO PFX "refreshing TRX partitions in '%s' (%d,%d)\n",
+ mtd->name, MTD_BLOCK_MAJOR, mtd->index);
+
+ /* remove old partitions */
+ del_mtd_partitions(mtd);
+
+ trxsplit_findtrx(mtd);
+ if (!trx_mtd)
+ goto err;
+
+ trxsplit_create_partitions(trx_mtd);
+ return 1;
+
+err:
+ return 0;
+}
+
+static void __init trxsplit_add_mtd(struct mtd_info *mtd)
+{
+ if (mtd->type != MTD_NORFLASH) {
+ printk(KERN_INFO PFX "'%s' is not a NOR flash, skipped\n",
+ mtd->name);
+ return;
+ }
+
+ if (!trx_mtd)
+ trxsplit_findtrx(mtd);
+}
+
+static void __init trxsplit_remove_mtd(struct mtd_info *mtd)
+{
+ /* nothing to do */
+}
+
+static struct mtd_notifier trxsplit_notifier __initdata = {
+ .add = trxsplit_add_mtd,
+ .remove = trxsplit_remove_mtd,
+};
+
+static void __init trxsplit_scan(void)
+{
+ register_mtd_user(&trxsplit_notifier);
+ unregister_mtd_user(&trxsplit_notifier);
+}
+
+static int __init trxsplit_init(void)
+{
+ trxsplit_scan();
+
+ if (trx_mtd) {
+ printk(KERN_INFO PFX "creating TRX partitions in '%s' "
+ "(%d,%d)\n", trx_mtd->name, MTD_BLOCK_MAJOR,
+ trx_mtd->index);
+ trxsplit_create_partitions(trx_mtd);
+ }
+
+ return 0;
+}
+
+late_initcall(trxsplit_init);