[PATCH V4 4/7] mmc: sdhci: add 32-bit block count support for v4 mode

[Chunyan Zhang]

Host Controller Version 4.10 re-defines SDMA System Address register
as 32-bit Block Count for v4 mode, and SDMA uses ADMA System
Address register (05Fh-058h) instead if v4 mode is enabled. Also
when using 32-bit block count, 16-bit block count register need
to be set to zero.

Signed-off-by: Chunyan Zhang <zhang.chunyan@xxxxxxxxxx>
---
 drivers/mmc/host/sdhci.c | 14 +++++++++++++-
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 920d8ec..c272a2b 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1070,7 +1070,19 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 	/* Set the DMA boundary value and block size */
 	sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
 		     SDHCI_BLOCK_SIZE);
-	sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
+
+	/*
+	 * For Version 4.10 onwards, if v4 mode is enabled, 16-bit Block Count
+	 * register need to be set to zero, 32-bit Block Count register would
+	 * be selected.
+	 */
+	if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
+		if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
+			sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
+		sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
+	} else {
+		sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
+	}
 }
 
 static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 23318ff..81aae07 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -28,6 +28,7 @@
 
 #define SDHCI_DMA_ADDRESS	0x00
 #define SDHCI_ARGUMENT2		SDHCI_DMA_ADDRESS
+#define SDHCI_32BIT_BLK_CNT	SDHCI_DMA_ADDRESS
 
 #define SDHCI_BLOCK_SIZE	0x04
 #define  SDHCI_MAKE_BLKSZ(dma, blksz) (((dma & 0x7) << 12) | (blksz & 0xFFF))
-- 
2.7.4