linux-kernel - [PATCH 01/11] ARM: MMCI: support 8bit mode on the ST Micro version

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Date:	Thu,  8 Apr 2010 01:12:14 +0200
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	akpm@...ux-foundation.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...retlab.ca>,
	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
	STEricsson_nomadik_linux@...t.st.com, linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 01/11] ARM: MMCI: support 8bit mode on the ST Micro version

This adds support for an 8bit wide bus to the card (data lines
MCIDAT0 through 7 exist) on the ST Micro version and alters the
U300 platform to support this. Also add some ST_ prefix to the
ST-specific registers.

Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
 arch/arm/mach-u300/mmc.c |    2 +-
 drivers/mmc/host/mmci.c  |    6 ++++--
 drivers/mmc/host/mmci.h  |    6 ++++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-u300/mmc.c b/arch/arm/mach-u300/mmc.c
index 77fbb1e..c2549b8 100644
--- a/arch/arm/mach-u300/mmc.c
+++ b/arch/arm/mach-u300/mmc.c
@@ -106,7 +106,7 @@ int __devinit mmc_init(struct amba_device *adev)
 	mmci_card->mmc0_plat_data.gpio_wp = -1;
 	mmci_card->mmc0_plat_data.gpio_cd = -1;
 	mmci_card->mmc0_plat_data.capabilities = MMC_CAP_MMC_HIGHSPEED |
-		MMC_CAP_SD_HIGHSPEED | MMC_CAP_4_BIT_DATA;
+		MMC_CAP_SD_HIGHSPEED | MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
 
 	mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
 
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 84c103a..7e70c1a 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -55,14 +55,16 @@ static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
 			host->cclk = host->mclk / (2 * (clk + 1));
 		}
 		if (host->hw_designer == AMBA_VENDOR_ST)
-			clk |= MCI_FCEN; /* Bug fix in ST IP block */
+			clk |= MCI_ST_FCEN; /* Bug fix in ST IP block */
 		clk |= MCI_CLK_ENABLE;
 		/* This hasn't proven to be worthwhile */
 		/* clk |= MCI_CLK_PWRSAVE; */
 	}
 
 	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
-		clk |= MCI_WIDE_BUS;
+		clk |= MCI_4BIT_BUS;
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
+		clk |= MCI_ST_8BIT_BUS;
 
 	writel(clk, host->base + MMCICLOCK);
 }
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 1ceb9a9..d77062e 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -25,9 +25,11 @@
 #define MCI_CLK_ENABLE		(1 << 8)
 #define MCI_CLK_PWRSAVE		(1 << 9)
 #define MCI_CLK_BYPASS		(1 << 10)
-#define MCI_WIDE_BUS		(1 << 11)
+#define MCI_4BIT_BUS		(1 << 11)
+/* 8bit wide buses supported in ST Micro versions */
+#define MCI_ST_8BIT_BUS		(1 << 12)
 /* HW flow control on the ST Micro version */
-#define MCI_FCEN		(1 << 13)
+#define MCI_ST_FCEN		(1 << 13)
 
 #define MMCIARGUMENT		0x008
 #define MMCICOMMAND		0x00c
-- 
1.6.3.3

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