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172 lines
4.5 KiB
Diff
172 lines
4.5 KiB
Diff
--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -12,6 +12,23 @@ menuconfig MTD
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if MTD
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+menu "OpenWrt specific MTD options"
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+
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+config MTD_ROOTFS_ROOT_DEV
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+ bool "Automatically set 'rootfs' partition to be root filesystem"
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+ default y
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+
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+config MTD_SPLIT_FIRMWARE
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+ bool "Automatically split firmware partition for kernel+rootfs"
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+ default y
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+
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+config MTD_SPLIT_FIRMWARE_NAME
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+ string "Firmware partition name"
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+ depends on MTD_SPLIT_FIRMWARE
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+ default "firmware"
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+
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+endmenu
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+
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config MTD_TESTS
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tristate "MTD tests support (DANGEROUS)"
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depends on m
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -30,9 +30,11 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/of.h>
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+#include <linux/magic.h>
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#include <linux/err.h>
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#include "mtdcore.h"
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+#include "mtdsplit/mtdsplit.h"
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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@@ -46,13 +48,14 @@ struct mtd_part {
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struct list_head list;
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};
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+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
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+
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/*
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* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
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* the pointer to that structure with this macro.
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*/
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#define PART(x) ((struct mtd_part *)(x))
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-
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/*
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* MTD methods which simply translate the effective address and pass through
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* to the _real_ device.
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@@ -548,8 +551,10 @@ out_register:
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return slave;
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}
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-int mtd_add_partition(struct mtd_info *master, const char *name,
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- long long offset, long long length)
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+
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+static int
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+__mtd_add_partition(struct mtd_info *master, const char *name,
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+ long long offset, long long length, bool dup_check)
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{
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struct mtd_partition part;
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struct mtd_part *p, *new;
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@@ -581,21 +586,24 @@ int mtd_add_partition(struct mtd_info *m
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end = offset + length;
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mutex_lock(&mtd_partitions_mutex);
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- list_for_each_entry(p, &mtd_partitions, list)
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- if (p->master == master) {
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- if ((start >= p->offset) &&
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- (start < (p->offset + p->mtd.size)))
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- goto err_inv;
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-
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- if ((end >= p->offset) &&
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- (end < (p->offset + p->mtd.size)))
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- goto err_inv;
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- }
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+ if (dup_check) {
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+ list_for_each_entry(p, &mtd_partitions, list)
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+ if (p->master == master) {
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+ if ((start >= p->offset) &&
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+ (start < (p->offset + p->mtd.size)))
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+ goto err_inv;
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+
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+ if ((end >= p->offset) &&
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+ (end < (p->offset + p->mtd.size)))
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+ goto err_inv;
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+ }
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+ }
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list_add(&new->list, &mtd_partitions);
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mutex_unlock(&mtd_partitions_mutex);
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add_mtd_device(&new->mtd);
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+ mtd_partition_split(master, new);
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return ret;
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err_inv:
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@@ -605,6 +613,12 @@ err_inv:
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}
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EXPORT_SYMBOL_GPL(mtd_add_partition);
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+int mtd_add_partition(struct mtd_info *master, const char *name,
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+ long long offset, long long length)
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+{
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+ return __mtd_add_partition(master, name, offset, length, true);
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+}
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+
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int mtd_del_partition(struct mtd_info *master, int partno)
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{
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struct mtd_part *slave, *next;
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@@ -628,6 +642,35 @@ int mtd_del_partition(struct mtd_info *m
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}
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EXPORT_SYMBOL_GPL(mtd_del_partition);
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+#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
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+#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
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+#else
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+#define SPLIT_FIRMWARE_NAME "unused"
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+#endif
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+
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+static void split_firmware(struct mtd_info *master, struct mtd_part *part)
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+{
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+}
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+
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+void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
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+ int offset, int size)
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+{
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+}
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+
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+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
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+{
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+ static int rootfs_found = 0;
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+
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+ if (rootfs_found)
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+ return;
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+
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+ if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
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+ config_enabled(CONFIG_MTD_SPLIT_FIRMWARE))
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+ split_firmware(master, part);
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+
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+ arch_split_mtd_part(master, part->mtd.name, part->offset,
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+ part->mtd.size);
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+}
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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@@ -657,6 +700,7 @@ int add_mtd_partitions(struct mtd_info *
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mutex_unlock(&mtd_partitions_mutex);
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add_mtd_device(&slave->mtd);
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+ mtd_partition_split(master, slave);
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cur_offset = slave->offset + slave->mtd.size;
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}
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--- a/include/linux/mtd/partitions.h
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+++ b/include/linux/mtd/partitions.h
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@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m
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long long offset, long long length);
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int mtd_del_partition(struct mtd_info *master, int partno);
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uint64_t mtd_get_device_size(const struct mtd_info *mtd);
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+extern void __weak arch_split_mtd_part(struct mtd_info *master,
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+ const char *name, int offset, int size);
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#endif
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