From: Lukasz Majewski <l.majewski@samsung.com>
Date: Thu, 12 May 2016 11:02:19 +0000 (+0200)
Subject: TPL: TM2: dwmmc: samsung: Add code to detect if dwmmc driver requires 64bit support
X-Git-Tag: submit/tizen/20160810.050017~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4ba80a5b6f451c54ea603e43ec1534944e20ba3f;p=platform%2Fkernel%2Fu-boot.git

TPL: TM2: dwmmc: samsung: Add code to detect if dwmmc driver requires 64bit support

Add to generic dwmmc driver code to check if this IP block require 64bit version
of idma.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---

diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index 863bbb3f64..99b6102510 100644
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -83,6 +83,7 @@ static void exynos_dwmci_board_init(struct dwmci_host *host)
 static int exynos_dwmci_core_init(struct dwmci_host *host, int index)
 {
 	unsigned int div;
+	int addr_config;
 	unsigned long freq, sclk;
 	struct dwmci_exynos_priv_data *priv = host->priv;
 
@@ -114,6 +115,12 @@ static int exynos_dwmci_core_init(struct dwmci_host *host, int index)
 	host->clksel = exynos_dwmci_clksel;
 	host->dev_index = index;
 	host->get_mmc_clk = exynos_dwmci_get_clk;
+
+	addr_config = DWMCI_GET_ADDR_CONFIG(dwmci_readl(host, DWMCI_HCON));
+	if (addr_config == 1)
+		/* host supports IDMAC in 64-bit address mode */
+		host->dma_64bit_address = 1;
+
 	/* Add the mmc channel to be registered with mmc core */
 	if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
 		printf("DWMMC%d registration failed\n", index);
diff --git a/include/dwmmc.h b/include/dwmmc.h
index 05b0817fe1..8c99d34028 100644
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -131,6 +131,7 @@
 /* quirks */
 #define DWMCI_QUIRK_DISABLE_SMU		(1 << 0)
 
+#define DWMCI_GET_ADDR_CONFIG(x) (((x)>>27) & 0x1)
 /**
  * struct dwmci_host - Information about a designware MMC host
  *
@@ -144,6 +145,7 @@
  * @dev_id:	Arbitrary device ID for use by controller
  * @buswidth:	Bus width in bits (8 or 4)
  * @fifoth_val:	Value for FIFOTH register (or 0 to leave unset)
+ * @dma_64bit_address:	True only for devices supporting 64 bit DMA
  * @mmc:	Pointer to generic MMC structure for this device
  * @priv:	Private pointer for use by controller
  */
@@ -160,6 +162,7 @@ struct dwmci_host {
 	int dev_id;
 	int buswidth;
 	u32 fifoth_val;
+	int dma_64bit_address;
 	struct mmc *mmc;
 	void *priv;