mmc: host: add SDHCI platform driver for msm chipsets

* Qualcomm SDHCI controller (sdhci-msm)

Qualcomm Technologies, Inc. Standard Secure Digital Host Controller (SDHC)

This file documents differences between the core properties in mmc.txt

and the properties used by the sdhci-msm driver.

Secure Digital Host Controller provides standard host interface to SD/MMC/SDIO cards.

Required properties:

- compatible: Should contain "qcom,sdhci-msm-v4".

- reg: Base address and length of the register in the following order:

	- Host controller register map (required)

	- SD Core register map (required)

- interrupts: Should contain an interrupt-specifiers for the interrupts:

	- Host controller interrupt (required)

- pinctrl-names: Should contain only one value - "default".

- pinctrl-0: Should specify pin control groups used for this controller.

- clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock-names.

- clock-names: Should contain the following:

	"iface" - Main peripheral bus clock (PCLK/HCLK - AHB Bus clock) (required)

	"core"	- SDC MMC clock (MCLK) (required)

	"bus"	- SDCC bus voter clock (optional)

  - compatible : should be "qcom,sdhci-msm"

  - reg : should contain SDHC, SD Core register map.

  - reg-names : indicates various resources passed to driver (via reg proptery) by name.

		Required "reg-names" are "hc_mem" and "core_mem"

  - interrupts : should contain SDHC interrupts.

  - interrupt-names : indicates interrupts passed to driver (via interrupts property) by name.

		      Required "interrupt-names" are "hc_irq" and "pwr_irq".

  - <supply-name>-supply: phandle to the regulator device tree node

			  Required "supply-name" are "vdd" and "vdd-io".

Example:

Required alias:

- The slot number is specified via an alias with the following format

	'sdhc{n}' where n is the slot number.

	sdhc_1: sdhci@f9824900 {

		compatible = "qcom,sdhci-msm-v4";

		reg = <0xf9824900 0x11c>, <0xf9824000 0x800>;

		interrupts = <0 123 0>;

		bus-width = <8>;

		non-removable;

Optional Properties:

	- interrupt-names - "status_irq". This status_irq will be used for card

			     detection.

	- qcom,bus-width - defines the bus I/O width that controller supports.

			   Units - number of bits. The valid bus-width values are

			   1, 4 and 8.

	- qcom,nonremovable - specifies whether the card in slot is

			      hot pluggable or hard wired.

	- qcom,bus-speed-mode - specifies supported bus speed modes by host.

				The supported bus speed modes are :

				"HS200_1p8v" - indicates that host can support HS200 at 1.8v.

				"HS200_1p2v" - indicates that host can support HS200 at 1.2v.

				"DDR_1p8v" - indicates that host can support DDR mode at 1.8v.

				"DDR_1p2v" - indicates that host can support DDR mode at 1.2v.

In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltage).

	- qcom,<supply>-always-on - specifies whether supply should be kept "on" always.

	- qcom,<supply>-lpm_sup - specifies whether supply can be kept in low power mode (lpm).

	- qcom,<supply>-voltage_level - specifies voltage levels for supply. Should be

					specified in pairs (min, max), units uV.

	- qcom,<supply>-current_level - specifies load levels for supply in lpm or

					high power mode (hpm). Should be specified in

					pairs (lpm, hpm), units uA.

		vmmc-supply = <&pm8941_l20>;

		vqmmc-supply = <&pm8941_s3>;

	- gpios - specifies gpios assigned for sdhc slot.

	- qcom,gpio-names -  a list of strings that map in order to the list of gpios

		pinctrl-names = "default";

		pinctrl-0 = <&sdc1_clk &sdc1_cmd &sdc1_data>;

Example:

		clocks = <&gcc GCC_SDCC1_APPS_CLK>, <&gcc GCC_SDCC1_AHB_CLK>;

		clock-names = "core", "iface";

	aliases {

		sdhc1 = &sdhc_1;

	};

	sdhc_2: sdhci@f98a4900 {

		compatible = "qcom,sdhci-msm-v4";

		reg = <0xf98a4900 0x11c>, <0xf98a4000 0x800>;

		interrupts = <0 125 0>;

		bus-width = <4>;

		cd-gpios = <&msmgpio 62 0x1>;

	sdhc_1: qcom,sdhc@f9824900 {

		compatible = "qcom,sdhci-msm";

                reg = <0xf9824900 0x11c>, <0xf9824000 0x800>;

                reg-names = "hc_mem", "core_mem";

                interrupts = <0 123 0>, <0 138 0>;

                interrupt-names = "hc_irq", "pwr_irq";

		vdd-supply = <&pm8941_l21>;

		vdd-io-supply = <&pm8941_l13>;

		qcom,vdd-voltage-level = <2950000 2950000>;

		qcom,vdd-current-level = <9000 800000>;

		vmmc-supply = <&pm8941_l21>;

		vqmmc-supply = <&pm8941_l13>;

		qcom,vdd-io-always-on;

		qcom,vdd-io-lpm-sup;

		qcom,vdd-io-voltage-level = <1800000 2950000>;

		qcom,vdd-io-current-level = <6 22000>;

		pinctrl-names = "default";

		pinctrl-0 = <&sdc2_clk &sdc2_cmd &sdc2_data>;

                qcom,bus-width = <4>;

		qcom,nonremovable;

		qcom,bus-speed-mode = "HS200_1p8v", "DDR_1p8v";

		clocks = <&gcc GCC_SDCC2_APPS_CLK>, <&gcc GCC_SDCC2_AHB_CLK>;

		clock-names = "core", "iface";

		gpios = <&msmgpio 40 0>, /* CLK */

			<&msmgpio 39 0>, /* CMD */

			<&msmgpio 38 0>, /* DATA0 */

			<&msmgpio 37 0>, /* DATA1 */

			<&msmgpio 36 0>, /* DATA2 */

			<&msmgpio 35 0>; /* DATA3 */

		qcom,gpio-names = "CLK", "CMD", "DAT0", "DAT1", "DAT2", "DAT3";

	};

	  If unsure, say N.

config MMC_SDHCI_MSM

	tristate "Qualcomm Technologies, Inc. SDHCI Controller Support"

	depends on ARCH_QCOM || ARCH_MSM || (ARM && COMPILE_TEST)

	depends on MMC_SDHCI_PLTFM

	help

	  This selects the Secure Digital Host Controller Interface (SDHCI)

	  support present in Qualcomm Technologies, Inc. SOCs. The controller

	  supports SD/MMC/SDIO devices.

	  If you have a controller with this interface, say Y or M here.

	  If unsure, say N.

config MMC_MSM

	tristate "Qualcomm SDCC Controller Support"

	depends on MMC && (ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50)

obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o

obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o

obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o

obj-$(CONFIG_MMC_SDHCI_MSM)		+= sdhci-msm.o

obj-$(CONFIG_MMC_SDHCI_IPROC)		+= sdhci-iproc.o

obj-$(CONFIG_MMC_SDHCI_ST)		+= sdhci-st.o

obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32)	+= sdhci-pic32.o

struct sdhci_pltfm_host {

	struct clk *clk;

	void *priv; /* to handle quirks across io-accessor calls */

	/* migrate from sdhci_of_host */

	unsigned int clock;