sdhci-of: add support for the wii sdhci controller

Add support for the Secure Digital Host Controller Interface found on the
"Hollywood" chipset of the Nintendo Wii video game console.

Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 82 insertions, 1 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d9234648199..ce1d28884e2 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -55,7 +55,7 @@ config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
           has the effect of scrambling the addresses and formats of data
           accessed in sizes other than the datum size.
 
-          This is the case for the Freescale eSDHC.
+          This is the case for the Freescale eSDHC and Nintendo Wii SDHCI.
 
 config MMC_SDHCI_PCI
         tristate "SDHCI support on PCI bus"
@@ -103,6 +103,17 @@ config MMC_SDHCI_OF_ESDHC
 
           If unsure, say N.
 
+config MMC_SDHCI_OF_HLWD
+        bool "SDHCI OF support for the Nintendo Wii SDHCI controllers"
+        depends on MMC_SDHCI_OF
+        select MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
+        help
+          This selects the Secure Digital Host Controller Interface (SDHCI)
+          found in the "Hollywood" chipset of the Nintendo Wii video game
+          console.
+
+          If unsure, say N.
+
 config MMC_SDHCI_PLTFM
         tristate "SDHCI support on the platform specific bus"
         depends on MMC_SDHCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index cbda9b2b912..3d253dd4240 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_SDH_BFIN)		+= bfin_sdh.o
 obj-$(CONFIG_MMC_SDHCI_OF)      += sdhci-of.o
 sdhci-of-y                              := sdhci-of-core.o
 sdhci-of-$(CONFIG_MMC_SDHCI_OF_ESDHC)   += sdhci-of-esdhc.o
+sdhci-of-$(CONFIG_MMC_SDHCI_OF_HLWD)    += sdhci-of-hlwd.o
 
 ifeq ($(CONFIG_CB710_DEBUG),y)
         CFLAGS-cb710-mmc        += -DDEBUG
diff --git a/drivers/mmc/host/sdhci-of-core.c b/drivers/mmc/host/sdhci-of-core.c
index add2008d890..55e33135edb 100644
--- a/drivers/mmc/host/sdhci-of-core.c
+++ b/drivers/mmc/host/sdhci-of-core.c
@@ -196,6 +196,9 @@ static const struct of_device_id sdhci_of_match[] = {
         { .compatible = "fsl,mpc8536-esdhc", .data = &sdhci_esdhc, },
         { .compatible = "fsl,esdhc", .data = &sdhci_esdhc, },
 #endif
+#ifdef CONFIG_MMC_SDHCI_OF_HLWD
+        { .compatible = "nintendo,hollywood-sdhci", .data = &sdhci_hlwd, },
+#endif
         { .compatible = "generic-sdhci", },
         {},
 };
diff --git a/drivers/mmc/host/sdhci-of-hlwd.c b/drivers/mmc/host/sdhci-of-hlwd.c
new file mode 100644
index 00000000000..35117f3ed75
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-hlwd.c
@@ -0,0 +1,65 @@
+/*
+ * drivers/mmc/host/sdhci-of-hlwd.c
+ *
+ * Nintendo Wii Secure Digital Host Controller Interface.
+ * Copyright (C) 2009 The GameCube Linux Team
+ * Copyright (C) 2009 Albert Herranz
+ *
+ * Based on sdhci-of-esdhc.c
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ * Copyright (c) 2009 MontaVista Software, Inc.
+ *
+ * Authors: Xiaobo Xie <X.Xie@freescale.com>
+ *          Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/mmc/host.h>
+#include "sdhci-of.h"
+#include "sdhci.h"
+
+/*
+ * Ops and quirks for the Nintendo Wii SDHCI controllers.
+ */
+
+/*
+ * We need a small delay after each write, or things go horribly wrong.
+ */
+#define SDHCI_HLWD_WRITE_DELAY  5 /* usecs */
+
+static void sdhci_hlwd_writel(struct sdhci_host *host, u32 val, int reg)
+{
+        sdhci_be32bs_writel(host, val, reg);
+        udelay(SDHCI_HLWD_WRITE_DELAY);
+}
+
+static void sdhci_hlwd_writew(struct sdhci_host *host, u16 val, int reg)
+{
+        sdhci_be32bs_writew(host, val, reg);
+        udelay(SDHCI_HLWD_WRITE_DELAY);
+}
+
+static void sdhci_hlwd_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+        sdhci_be32bs_writeb(host, val, reg);
+        udelay(SDHCI_HLWD_WRITE_DELAY);
+}
+
+struct sdhci_of_data sdhci_hlwd = {
+        .quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
+                  SDHCI_QUIRK_32BIT_DMA_SIZE,
+        .ops = {
+                .readl = sdhci_be32bs_readl,
+                .readw = sdhci_be32bs_readw,
+                .readb = sdhci_be32bs_readb,
+                .writel = sdhci_hlwd_writel,
+                .writew = sdhci_hlwd_writew,
+                .writeb = sdhci_hlwd_writeb,
+        },
+};
diff --git a/drivers/mmc/host/sdhci-of.h b/drivers/mmc/host/sdhci-of.h
index 17e873d3baa..ad09ad9915d 100644
--- a/drivers/mmc/host/sdhci-of.h
+++ b/drivers/mmc/host/sdhci-of.h
@@ -37,5 +37,6 @@ extern void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg);
 extern void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg);
 
 extern struct sdhci_of_data sdhci_esdhc;
+extern struct sdhci_of_data sdhci_hlwd;
 
 #endif /* __SDHCI_OF_H */