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Commit 3cbcb160 authored by David Lanzendörfer's avatar David Lanzendörfer Committed by Mike Turquette
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mmc: sunxi: Add driver for SD/MMC hosts found on Allwinner sunxi SoCs 



The Allwinner sunxi mmc host uses dma in bus-master mode using a built-in
designware idmac controller, which is identical to the one found in the mmc-dw
hosts. However the rest of the host is not identical to mmc-dw, it deals with
sending stop commands in hardware which makes it significantly different
from the mmc-dw devices.

Signed-off-by: default avatarDavid Lanzendörfer <david.lanzendoerfer@o2s.ch>
[hdegoede@redhat.com: various cleanups and fixes]
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarChris Ball <chris@printf.net>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 1cdf8ee2

Documentation/devicetree/bindings/mmc/sunxi-mmc.txt

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* Allwinner sunxi MMC controller



The highspeed MMC host controller on Allwinner SoCs provides an interface

for MMC, SD and SDIO types of memory cards.



Supported maximum speeds are the ones of the eMMC standard 4.5 as well

as the speed of SD standard 3.0.

Absolute maximum transfer rate is 200MB/s



Required properties:

 - compatible : "allwinner,sun4i-a10-mmc" or "allwinner,sun5i-a13-mmc"

 - reg : mmc controller base registers

 - clocks : a list with 2 phandle + clock specifier pairs

 - clock-names : must contain "ahb" and "mmc"

 - interrupts : mmc controller interrupt



Optional properties:

 - resets : phandle + reset specifier pair

 - reset-names : must contain "ahb"

 - for cd, bus-width and additional generic mmc parameters

   please refer to mmc.txt within this directory



Examples:

	- Within .dtsi:

	mmc0: mmc@01c0f000 {

		compatible = "allwinner,sun5i-a13-mmc";

		reg = <0x01c0f000 0x1000>;

		clocks = <&ahb_gates 8>, <&mmc0_clk>;

		clock-names = "ahb", "mod";

		interrupts = <0 32 4>;

		status = "disabled";

	};



	- Within dts:

	mmc0: mmc@01c0f000 {

		pinctrl-names = "default", "default";

		pinctrl-0 = <&mmc0_pins_a>;

		pinctrl-1 = <&mmc0_cd_pin_reference_design>;

		bus-width = <4>;

		cd-gpios = <&pio 7 1 0>; /* PH1 */

		cd-inverted;

		status = "okay";

	};

drivers/mmc/host/Kconfig

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@@ -694,3 +694,10 @@ config MMC_REALTEK_PCI 
	help

	  Say Y here to include driver code to support SD/MMC card interface

	  of Realtek PCI-E card reader



config MMC_SUNXI

	tristate "Allwinner sunxi SD/MMC Host Controller support"

	depends on ARCH_SUNXI

	help

	  This selects support for the SD/MMC Host Controller on

	  Allwinner sunxi SoCs.

drivers/mmc/host/Makefile

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@@ -50,6 +50,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o 
obj-$(CONFIG_MMC_VUB300)	+= vub300.o

obj-$(CONFIG_MMC_USHC)		+= ushc.o

obj-$(CONFIG_MMC_WMT)		+= wmt-sdmmc.o

obj-$(CONFIG_MMC_SUNXI)		+= sunxi-mmc.o



obj-$(CONFIG_MMC_REALTEK_PCI)	+= rtsx_pci_sdmmc.o

drivers/mmc/host/sunxi-mmc.c

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File added.

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