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mmc: sdhci: Add Support for ADMA2

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The Standard Host Controller Interface (SDHCI) specification version
3.00 adds support for Advanced DMA (ADMA) for both 64 and 32 bit widths
of DMA. ADMA2 uses a table of descriptors for aggregating DMA requests.
This significantly improves read and write throughput.

Add Support for the same.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
This commit is contained in:
Faiz Abbas 2019-04-16 23:06:58 +05:30 • committed by Peng Fan
parent 6d6af20571
commit 37cb626da2
3 changed files with 170 additions and 23 deletions
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41
include/sdhci.h
View file

@ -186,6 +186,7 @@
/* 55-57 reserved */
#define SDHCI_ADMA_ADDRESS 0x58
#define SDHCI_ADMA_ADDRESS_HI 0x5c
/* 60-FB reserved */
@ -252,6 +253,38 @@ struct sdhci_ops {
void (*set_delay)(struct sdhci_host *host);
};
#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
#define ADMA_MAX_LEN 65532
#ifdef CONFIG_DMA_ADDR_T_64BIT
#define ADMA_DESC_LEN 16
#else
#define ADMA_DESC_LEN 8
#endif
#define ADMA_TABLE_NO_ENTRIES (CONFIG_SYS_MMC_MAX_BLK_COUNT * \
MMC_MAX_BLOCK_LEN) / ADMA_MAX_LEN
#define ADMA_TABLE_SZ (ADMA_TABLE_NO_ENTRIES * ADMA_DESC_LEN)
/* Decriptor table defines */
#define ADMA_DESC_ATTR_VALID BIT(0)
#define ADMA_DESC_ATTR_END BIT(1)
#define ADMA_DESC_ATTR_INT BIT(2)
#define ADMA_DESC_ATTR_ACT1 BIT(4)
#define ADMA_DESC_ATTR_ACT2 BIT(5)
#define ADMA_DESC_TRANSFER_DATA ADMA_DESC_ATTR_ACT2
#define ADMA_DESC_LINK_DESC (ADMA_DESC_ATTR_ACT1 | ADMA_DESC_ATTR_ACT2)
struct sdhci_adma_desc {
u8 attr;
u8 reserved;
u16 len;
u32 addr_lo;
#ifdef CONFIG_DMA_ADDR_T_64BIT
u32 addr_hi;
#endif
} __packed;
#endif
struct sdhci_host {
const char *name;
void *ioaddr;
@ -275,6 +308,14 @@ struct sdhci_host {
dma_addr_t start_addr;
int flags;
#define USE_SDMA (0x1 << 0)
#define USE_ADMA (0x1 << 1)
#define USE_ADMA64 (0x1 << 2)
#define USE_DMA (USE_SDMA | USE_ADMA | USE_ADMA64)
dma_addr_t adma_addr;
#if CONFIG_IS_ENABLED(MMC_SDHCI_ADMA)
struct sdhci_adma_desc *adma_desc_table;
uint desc_slot;
#endif
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS