diff options
Diffstat (limited to 'arch/arm/mach-msm/nand_partitions.c')
| -rw-r--r-- | arch/arm/mach-msm/nand_partitions.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/nand_partitions.c b/arch/arm/mach-msm/nand_partitions.c new file mode 100644 index 000000000000..fc874470339b --- /dev/null +++ b/arch/arm/mach-msm/nand_partitions.c @@ -0,0 +1,187 @@ +/* arch/arm/mach-msm/nand_partitions.c + * + * Code to extract partition information from ATAG set up by the + * bootloader. + * + * Copyright (C) 2007 Google, Inc. + * Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved. + * Author: Brian Swetland <swetland@google.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> + +#include <asm/mach/flash.h> +#include <linux/io.h> + +#include <asm/setup.h> + +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> + +#include <mach/msm_iomap.h> + +#include <mach/board.h> +#include "smd_private.h" + +/* configuration tags specific to msm */ + +#define ATAG_MSM_PARTITION 0x4d534D70 /* MSMp */ + +struct msm_ptbl_entry { + char name[16]; + __u32 offset; + __u32 size; + __u32 flags; +}; + +#define MSM_MAX_PARTITIONS 8 + +static struct mtd_partition msm_nand_partitions[MSM_MAX_PARTITIONS]; +static char msm_nand_names[MSM_MAX_PARTITIONS * 16]; + +extern struct flash_platform_data msm_nand_data; + +static int __init parse_tag_msm_partition(const struct tag *tag) +{ + struct mtd_partition *ptn = msm_nand_partitions; + char *name = msm_nand_names; + struct msm_ptbl_entry *entry = (void *) &tag->u; + unsigned count, n; + + count = (tag->hdr.size - 2) / + (sizeof(struct msm_ptbl_entry) / sizeof(__u32)); + + if (count > MSM_MAX_PARTITIONS) + count = MSM_MAX_PARTITIONS; + + for (n = 0; n < count; n++) { + memcpy(name, entry->name, 15); + name[15] = 0; + + ptn->name = name; + ptn->offset = entry->offset * 64 * 2048; + ptn->size = entry->size * 64 * 2048; + + printk(KERN_INFO "Partition (from atag) %s " + "-- Offset:%llx Size:%llx\n", + ptn->name, ptn->offset, ptn->size); + + name += 16; + entry++; + ptn++; + } + + msm_nand_data.nr_parts = count; + msm_nand_data.parts = msm_nand_partitions; + + return 0; +} + +__tagtable(ATAG_MSM_PARTITION, parse_tag_msm_partition); + +#define FLASH_PART_MAGIC1 0x55EE73AA +#define FLASH_PART_MAGIC2 0xE35EBDDB +#define FLASH_PARTITION_VERSION 0x3 + +#define LINUX_FS_PARTITION_NAME "0:EFS2APPS" + +struct flash_partition_entry { + char name[16]; + u32 offset; /* Offset in blocks from beginning of device */ + u32 length; /* Length of the partition in blocks */ + u8 attrib1; + u8 attrib2; + u8 attrib3; + u8 which_flash; /* Numeric ID (first = 0, second = 1) */ +}; +struct flash_partition_table { + u32 magic1; + u32 magic2; + u32 version; + u32 numparts; + struct flash_partition_entry part_entry[16]; +}; + +static int get_nand_partitions(void) +{ + struct flash_partition_table *partition_table; + struct flash_partition_entry *part_entry; + struct mtd_partition *ptn = msm_nand_partitions; + char *name = msm_nand_names; + int part; + + if (msm_nand_data.nr_parts) + return 0; + + partition_table = (struct flash_partition_table *) + smem_alloc(SMEM_AARM_PARTITION_TABLE, + sizeof(struct flash_partition_table)); + + if (!partition_table) { + printk(KERN_WARNING "%s: no flash partition table in shared " + "memory\n", __func__); + return -ENOENT; + } + + if ((partition_table->magic1 != (u32) FLASH_PART_MAGIC1) || + (partition_table->magic2 != (u32) FLASH_PART_MAGIC2) || + (partition_table->version != (u32) FLASH_PARTITION_VERSION)) { + printk(KERN_WARNING "%s: version mismatch -- magic1=%#x, " + "magic2=%#x, version=%#x\n", __func__, + partition_table->magic1, + partition_table->magic2, + partition_table->version); + return -EFAULT; + } + + msm_nand_data.nr_parts = 0; + + /* Get the LINUX FS partition info */ + for (part = 0; part < partition_table->numparts; part++) { + part_entry = &partition_table->part_entry[part]; + + /* Find a match for the Linux file system partition */ + if (strcmp(part_entry->name, LINUX_FS_PARTITION_NAME) == 0) { + strcpy(name, part_entry->name); + ptn->name = name; + + /*TODO: Get block count and size info */ + ptn->offset = part_entry->offset * 64 * 2048; + + /* For SMEM, -1 indicates remaining space in flash, + * but for MTD it is 0 + */ + if (part_entry->length == (u32)-1) + ptn->size = 0; + else + ptn->size = part_entry->length * 64 * 2048; + + msm_nand_data.nr_parts = 1; + msm_nand_data.parts = msm_nand_partitions; + + printk(KERN_INFO "Partition(from smem) %s " + "-- Offset:%llx Size:%llx\n", + ptn->name, ptn->offset, ptn->size); + + return 0; + } + } + + printk(KERN_WARNING "%s: no partition table found!", __func__); + + return -ENODEV; +} + +device_initcall(get_nand_partitions); |