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 mmcblk0gp3
179 160 4096 mmcblk0gp2
179 128 4096 mmcblk0gp1
179 96 1052672 mmcblk0gp0
179 64 1024 mmcblk0boot1
179 32 1024 mmcblk0boot0
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxx>
---
drivers/mmc/card/block.c | 31 +++++++++++++++------------
drivers/mmc/core/mmc.c | 52 ++++++++++++++++++++++++++++++++++++++++++++-
include/linux/mmc/card.h | 32 +++++++++++++++++++++++++++-
include/linux/mmc/mmc.h | 3 --
4 files changed, 98 insertions(+), 20 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 1ff5486..56f7185 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1377,26 +1377,29 @@ 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 idx, 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 (idx = 0; idx < card->nr_parts; idx++) {
+ if (card->part[idx].size) {
+ ret = mmc_blk_alloc_part(card, md,
+ card->part[idx].cookie,
+ card->part[idx].size >> 9,
+ card->part[idx].force_ro,
+ card->part[idx].name);
+ if (ret)
+ return ret;
+ }
}
return ret;
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 5700b1c..5db4cee 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -41,6 +41,11 @@ static const unsigned int tacc_mant[] = {
35, 40, 45, 50, 55, 60, 70, 80,
};
+/* partition configuration array */
+static const unsigned int part_cfg[] = {
+ 0x1, 0x2, 0x4, 0x5, 0x6, 0x7,
+};
+
#define UNSTUFF_BITS(resp,start,size) \
({ \
const int __size = size; \
@@ -239,7 +244,8 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
*/
static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
{
- int err = 0;
+ int err = 0, idx, part_num;
+ unsigned int part_size, gp_size_mult;
BUG_ON(!card);
@@ -340,7 +346,16 @@ 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;
+ if (ext_csd[EXT_CSD_BOOT_MULT]) {
+ card->nr_parts = MMC_NUM_BOOT_PARTITION;
+ for (idx = 0, part_num = 0;
+ idx < MMC_NUM_BOOT_PARTITION; idx++,
+ part_num++) {
+ part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
+ mmc_part_add(card, part_size, part_cfg[idx],
+ "boot%d", idx, part_num, true);
+ }
+ }
}
card->ext_csd.raw_hc_erase_gap_size =
@@ -392,6 +407,39 @@ 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;
}
+
+ /*
+ * General purpose partition feature support --
+ * If ext_csd have the size of general purpose partitions,
+ * set size, part_type, partition name in mmc_part.
+ */
+
+ 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;
+
+ card->nr_parts += MMC_NUM_GP_PARTITION;
+ for (part_num = 0, gp_size_mult = 143;
+ idx < card->nr_parts;
+ idx++, part_num++, gp_size_mult += 3) {
+ if (!ext_csd[gp_size_mult] &&
+ !ext_csd[gp_size_mult + 1] &&
+ !ext_csd[gp_size_mult + 2])
+ continue;
+ part_size = (ext_csd[gp_size_mult + 2] << 16) +
+ (ext_csd[gp_size_mult + 1] << 8) +
+ ext_csd[gp_size_mult];
+ part_size *= (size_t)(hc_erase_grp_sz *
+ hc_wp_grp_sz);
+ part_size <<= 19;
+ mmc_part_add(card, part_size, part_cfg[idx],
+ "gp%d", idx, part_num, 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..941f2d0 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_NUM_GP_PARTITION 4
+
+/*
+ * 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
*/
@@ -216,9 +232,23 @@ struct mmc_card {
unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
struct dentry *debugfs_root;
+ struct mmc_part part[MMC_NUM_BOOT_PARTITION + MMC_NUM_GP_PARTITION]; /* mmc physical partitions */
+ unsigned int nr_parts;
};
/*
+ * This function fill contents in mmc_part.
+ */
+static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
+ unsigned int part_cfg, char *name, int idx, int part_num, bool ro)
+{
+ card->part[idx].size = size;
+ card->part[idx].cookie = part_cfg;
+ sprintf(card->part[idx].name, name, part_num);
+ card->part[idx].force_ro = ro;
+}
+
+/*
* The world is not perfect and supplies us with broken mmc/sdio devices.
* For at least some of these bugs we need a work-around.
*/
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 5a794cb..08f1746 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -299,10 +299,7 @@ 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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