[U-Boot] [PATCH v3 14/19] mmc: dw_mmc: support transfer mode autodetection

[Paweł Jarosz]

dw_mmc supports two transfer modes in u-boot: idma and fifo.
This patch adds autodetection of transfer mode and eliminates setting this in host config struct

Signed-off-by: Paweł Jarosz <paweljarosz3691 at gmail.com>
---
Changes since v1:
- none

Changes since v2:
- none

 drivers/mmc/dw_mmc.c | 8 ++++++++
 include/dwmmc.h      | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 700f764..2cc4d67 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -428,6 +428,7 @@ static int dwmci_set_ios(struct mmc *mmc)
 static int dwmci_init(struct mmc *mmc)
 {
 	struct dwmci_host *host = mmc->priv;
+	uint32_t use_dma;
 
 	if (host->board_init)
 		host->board_init(host);
@@ -439,6 +440,13 @@ static int dwmci_init(struct mmc *mmc)
 		return -EIO;
 	}
 
+	use_dma = SDMMC_GET_TRANS_MODE(dwmci_readl(host, DWMCI_HCON));
+	if (use_dma == DMA_INTERFACE_IDMA) {
+		host->fifo_mode = 0;
+	} else {
+		host->fifo_mode = 1;
+	}
+
 	/* Enumerate at 400KHz */
 	dwmci_setup_bus(host, mmc->cfg->f_min);
 
diff --git a/include/dwmmc.h b/include/dwmmc.h
index 4dda009..269536d 100644
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -115,6 +115,10 @@
 #define RX_WMARK_SHIFT		16
 #define RX_WMARK_MASK		(0xfff << RX_WMARK_SHIFT)
 
+/* HCON Register */
+#define DMA_INTERFACE_IDMA		(0x0)
+#define SDMMC_GET_TRANS_MODE(x)		(((x)>>16) & 0x3)
+
 #define DWMCI_IDMAC_OWN		(1 << 31)
 #define DWMCI_IDMAC_CH		(1 << 4)
 #define DWMCI_IDMAC_FS		(1 << 3)
-- 
2.7.4