mmc: sdhci: Add Support for ADMA2
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>
diff --git a/include/sdhci.h b/include/sdhci.h
index c66ec6c..eee493a 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -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 @@
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 @@
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