[PATCH v2] mmc : general purpose partition support.
From: Namjae Jeon
Date: Sat Sep 24 2011 - 01:08:08 EST
It allows gerneral purpose partitions in MMC Device.
And I try to simpliy make mmc_blk_alloc_parts using mmc_part structure suggested by Andrei Warkentin.
After patching, we can see general purpose partitions like this.
> cat /proc/partitions
179 0 847872 mmcblk0
179 192 4096 mmcblk0gp4
179 160 4096 mmcblk0gp3
179 128 4096 mmcblk0gp2
179 96 1052672 mmcblk0gp1
179 64 1024 mmcblk0boot1
179 32 1024 mmcblk0boot0
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxx>
---
drivers/mmc/card/block.c | 30 ++++++++++++++++--------------
drivers/mmc/core/mmc.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
include/linux/mmc/card.h | 19 ++++++++++++++++++-
include/linux/mmc/mmc.h | 2 --
4 files changed, 79 insertions(+), 18 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 1ff5486..8ec7cfd 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1377,26 +1377,28 @@ static int mmc_blk_alloc_part(struct mmc_card *card,
return 0;
}
+/* MMC Physical partition consist of two boot partitons and
+ * four general purpose partitions.
+ * if the register of respective partitions is set in ext_csd,
+ * it allocate block device to be accessed.
+ */
+
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
- int ret = 0;
+ int i, ret = 0;
if (!mmc_card_mmc(card))
return 0;
- if (card->ext_csd.boot_size) {
- ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
- card->ext_csd.boot_size >> 9,
- true,
- "boot0");
- if (ret)
- return ret;
- ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
- card->ext_csd.boot_size >> 9,
- true,
- "boot1");
- if (ret)
- return ret;
+ for (i = 0; i < MMC_MAX_NUM_PHY_PARTITION; i++) {
+ if (card->part[i].size) {
+ ret = mmc_blk_alloc_part(card, md, card->part[i].cookie,
+ card->part[i].size >> 9,
+ card->part[i].force_ro,
+ card->part[i].name);
+ if (ret)
+ return ret;
+ }
}
return ret;
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 5700b1c..56c4b9e 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -340,7 +340,18 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
* There are two boot regions of equal size, defined in
* multiples of 128K.
*/
- card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
+ int i, boot_part_config;
+ if (ext_csd[EXT_CSD_BOOT_MULT]) {
+ for (i = 0, boot_part_config = 0x1;
+ i < MMC_NUM_BOOT_PARTITION;
+ i++, boot_part_config++) {
+ card->part[i].size =
+ ext_csd[EXT_CSD_BOOT_MULT] << 17;
+ card->part[i].cookie = boot_part_config;
+ sprintf(card->part[i].name, "boot%d", i);
+ card->part[i].force_ro = true;
+ }
+ }
}
card->ext_csd.raw_hc_erase_gap_size =
@@ -392,6 +403,39 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.enhanced_area_offset = -EINVAL;
card->ext_csd.enhanced_area_size = -EINVAL;
}
+
+ if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x1) {
+ u8 hc_erase_grp_sz =
+ ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+ u8 hc_wp_grp_sz =
+ ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
+
+ card->ext_csd.enhanced_area_en = 1;
+
+ int i, gp_num, gp_part_config, gp_size_mult;
+ for (i = 2, gp_num = 1, gp_part_config = 0x4,
+ gp_size_mult = 143;
+ i < MMC_MAX_NUM_PHY_PARTITION;
+ i++, gp_num++, gp_part_config++,
+ gp_size_mult += 3) {
+ if (!ext_csd[gp_size_mult] &&
+ !ext_csd[gp_size_mult + 1] &&
+ !ext_csd[gp_size_mult + 2])
+ continue;
+ card->part[i].size =
+ (ext_csd[gp_size_mult + 2] << 16) +
+ (ext_csd[gp_size_mult + 1] << 8) +
+ ext_csd[gp_size_mult];
+ card->part[i].size *=
+ (size_t)(hc_erase_grp_sz *
+ hc_wp_grp_sz);
+ card->part[i].size <<= 19;
+ card->part[i].cookie = gp_part_config;
+ sprintf(card->part[i].name,
+ "gp%d", gp_num);
+ card->part[i].force_ro = false;
+ }
+ }
card->ext_csd.sec_trim_mult =
ext_csd[EXT_CSD_SEC_TRIM_MULT];
card->ext_csd.sec_erase_mult =
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index b460fc2..842f702 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -12,6 +12,7 @@
#include <linux/mmc/core.h>
#include <linux/mod_devicetable.h>
+#include <linux/genhd.h>
struct mmc_cid {
unsigned int manfid;
@@ -63,7 +64,6 @@ struct mmc_ext_csd {
bool enhanced_area_en; /* enable bit */
unsigned long long enhanced_area_offset; /* Units: Byte */
unsigned int enhanced_area_size; /* Units: KB */
- unsigned int boot_size; /* in bytes */
u8 raw_partition_support; /* 160 */
u8 raw_erased_mem_count; /* 181 */
u8 raw_ext_csd_structure; /* 194 */
@@ -157,6 +157,22 @@ struct sdio_func_tuple;
#define SDIO_MAX_FUNCS 7
+/* The number of MMC physical partitions
+ * It consist of boot partitions(2), general purpose partitions(4) in MMC v4.4
+ */
+#define MMC_NUM_BOOT_PARTITION 2
+#define MMC_MAX_NUM_PHY_PARTITION 6
+
+/*
+ * MMC Physical partitions
+ */
+struct mmc_part {
+ unsigned int size; /* partition size (in bytes) */
+ unsigned int cookie; /* it used to part_type */
+ char name[DISK_NAME_LEN];
+ bool force_ro; /* to make boot parts RO by default */
+};
+
/*
* MMC device
*/
@@ -216,6 +232,7 @@ struct mmc_card {
unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
struct dentry *debugfs_root;
+ struct mmc_part part[MMC_MAX_NUM_PHY_PARTITION]; /* mmc physical partitions */
};
/*
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 5a794cb..33eae3d 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -301,8 +301,6 @@ struct _mmc_csd {
#define EXT_CSD_WR_REL_PARAM_EN (1<<2)
#define EXT_CSD_PART_CONFIG_ACC_MASK (0x7)
-#define EXT_CSD_PART_CONFIG_ACC_BOOT0 (0x1)
-#define EXT_CSD_PART_CONFIG_ACC_BOOT1 (0x2)
#define EXT_CSD_CMD_SET_NORMAL (1<<0)
#define EXT_CSD_CMD_SET_SECURE (1<<1)
--
1.7.4.4
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