xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mmc: core: general purpose MMC partition support.

Browse Source 
It allows gerneral purpose partitions in MMC Device.  And I try to simply
make mmc_blk_alloc_parts using mmc_part structure suggested by Andrei
Warkentin.  After patching, we 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@gmail.com>
Acked-by: Andrei Warkentin <awarkentin@vmware.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Namjae Jeon
2011-10-06 23:41:38 +09:00
committed by Chris Ball
parent 5238acbe36
commit e0c368d571
4 changed files with 102 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
include/linux/mmc/card.h
View File

@@ -12,6 +12,7 @@
#include <linux/mmc/core.h>
#include <linux/mod_devicetable.h>
#include <linux/genhd.h>
struct mmc_cid {
unsigned int manfid;
@@ -64,7 +65,6 @@ 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 */
@@ -158,6 +158,23 @@ struct sdio_func_tuple;
#define SDIO_MAX_FUNCS 7
/* The number of MMC physical partitions. These 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
#define MMC_NUM_PHY_PARTITION 6
/*
* MMC Physical partitions
*/
struct mmc_part {
unsigned int size; /* partition size (in bytes) */
unsigned int part_cfg; /* partition type */
char name[DISK_NAME_LEN];
bool force_ro; /* to make boot parts RO by default */
};
/*
* MMC device
*/
@@ -219,8 +236,23 @@ 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_PHY_PARTITION]; /* 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, bool ro)
{
card->part[card->nr_parts].size = size;
card->part[card->nr_parts].part_cfg = part_cfg;
sprintf(card->part[card->nr_parts].name, name, idx);
card->part[card->nr_parts].force_ro = ro;
card->nr_parts++;
}
/*
* 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.