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mmc: core: Add cache control for eMMC4.5 device

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This patch adds cache feature of eMMC4.5 Spec.
If device supports cache capability, host can utilize some specific
operations.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Seungwon Jeon
2011-10-14 14:03:21 +09:00
committed by Chris Ball
parent 71fe3eb0d0
commit 881d1c25f7
7 changed files with 104 additions and 6 deletions
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2
include/linux/mmc/card.h
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@@ -51,6 +51,7 @@ struct mmc_ext_csd {
u8 rel_sectors;
u8 rel_param;
u8 part_config;
u8 cache_ctrl;
u8 rst_n_function;
unsigned int part_time; /* Units: ms */
unsigned int sa_timeout; /* Units: 100ns */
@@ -67,6 +68,7 @@ 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 cache_size; /* Units: KB */
u8 raw_partition_support; /* 160 */
u8 raw_erased_mem_count; /* 181 */
u8 raw_ext_csd_structure; /* 194 */

2
include/linux/mmc/core.h
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@@ -177,6 +177,8 @@ extern void mmc_release_host(struct mmc_host *host);
extern void mmc_do_release_host(struct mmc_host *host);
extern int mmc_try_claim_host(struct mmc_host *host);
extern int mmc_flush_cache(struct mmc_card *);
/**
* mmc_claim_host - exclusively claim a host
* @host: mmc host to claim

3
include/linux/mmc/host.h
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@@ -239,6 +239,7 @@ struct mmc_host {
unsigned int caps2; /* More host capabilities */
#define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
#define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
mmc_pm_flag_t pm_caps; /* supported pm features */
@@ -349,6 +350,8 @@ extern int mmc_power_restore_host(struct mmc_host *host);
extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
extern int mmc_cache_ctrl(struct mmc_host *, u8);
static inline void mmc_signal_sdio_irq(struct mmc_host *host)
{
host->ops->enable_sdio_irq(host, 0);

3
include/linux/mmc/mmc.h
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@@ -270,6 +270,8 @@ struct _mmc_csd {
* EXT_CSD fields
*/
#define EXT_CSD_FLUSH_CACHE 32 /* W */
#define EXT_CSD_CACHE_CTRL 33 /* R/W */
#define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
#define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
#define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
@@ -308,6 +310,7 @@ struct _mmc_csd {
#define EXT_CSD_PWR_CL_DDR_52_360 239 /* RO */
#define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
#define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
#define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
/*
* EXT_CSD field definitions