Commit ff66a3c8 authored by Minal Shah's avatar Minal Shah Committed by Tony Lindgren
Browse files

ARM: dts: dra7: add support for parallel NAND flash 



DRA7xx platform has in-build GPMC and ELM h/w engines which can be used
for accessing externel NAND flash device. This patch:
- adds generic DT binding in dra7.dtsi for enabling GPMC and ELM h/w engines
- adds DT binding for Micron NAND Flash (MT29F2G16AADWP) present on dra7-evm
*Important*
	On DRA7 EVM, GPMC_WPN and NAND_BOOTn are controlled by DIP switch
	So following board settings are required for NAND device detection:
	SW5.9 (GPMC_WPN) = LOW
	SW5.1 (NAND_BOOTn) = HIGH

Signed-off-by: default avatarMinal Shah <minalkshah@gmail.com>
Signed-off-by: default avatarPekon Gupta <pekon@ti.com>
Reviewed-by: default avatarJavier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 7b25babf

arch/arm/boot/dts/dra7-evm.dts

+118 −0
Original line number Diff line number Diff line
@@ -120,6 +120,37 @@ 
			0x284 (PIN_INPUT_SLEW | MUX_MODE0) /* usb2_drvvbus */

                >;

        };



	nand_flash_x16: nand_flash_x16 {

		/* On DRA7 EVM, GPMC_WPN and NAND_BOOTn comes from DIP switch

		 * So NAND flash requires following switch settings:

		 * SW5.9 (GPMC_WPN) = LOW

		 * SW5.1 (NAND_BOOTn) = HIGH */

		pinctrl-single,pins = <

			0x0 	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad0	*/

			0x4 	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad1	*/

			0x8 	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad2	*/

			0xc 	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad3	*/

			0x10	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad4	*/

			0x14	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad5	*/

			0x18	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad6	*/

			0x1c	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad7	*/

			0x20	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad8	*/

			0x24	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad9	*/

			0x28	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad10	*/

			0x2c	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad11	*/

			0x30	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad12	*/

			0x34	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad13	*/

			0x38	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad14	*/

			0x3c	(PIN_INPUT  | MUX_MODE0)	/* gpmc_ad15	*/

			0xd8	(PIN_INPUT_PULLUP  | MUX_MODE0)	/* gpmc_wait0	*/

			0xcc	(PIN_OUTPUT | MUX_MODE0)	/* gpmc_wen	*/

			0xb4	(PIN_OUTPUT_PULLUP | MUX_MODE0)	/* gpmc_csn0	*/

			0xc4	(PIN_OUTPUT | MUX_MODE0)	/* gpmc_advn_ale */

			0xc8	(PIN_OUTPUT | MUX_MODE0)	/* gpmc_oen_ren	 */

			0xd0	(PIN_OUTPUT | MUX_MODE0)	/* gpmc_be0n_cle */

		>;

	};

};



&i2c1 {
@@ -377,3 +408,90 @@ 
	pinctrl-names = "default";

	pinctrl-0 = <&usb2_pins>;

};



&elm {

	status = "okay";

};



&gpmc {

	status = "okay";

	pinctrl-names = "default";

	pinctrl-0 = <&nand_flash_x16>;

	ranges = <0 0 0 0x01000000>;	/* minimum GPMC partition = 16MB */

	nand@0,0 {

		reg = <0 0 4>;		/* device IO registers */

		ti,nand-ecc-opt = "bch8";

		ti,elm-id = <&elm>;

		nand-bus-width = <16>;

		gpmc,device-width = <2>;

		gpmc,sync-clk-ps = <0>;

		gpmc,cs-on-ns = <0>;

		gpmc,cs-rd-off-ns = <40>;

		gpmc,cs-wr-off-ns = <40>;

		gpmc,adv-on-ns = <0>;

		gpmc,adv-rd-off-ns = <30>;

		gpmc,adv-wr-off-ns = <30>;

		gpmc,we-on-ns = <5>;

		gpmc,we-off-ns = <25>;

		gpmc,oe-on-ns = <2>;

		gpmc,oe-off-ns = <20>;

		gpmc,access-ns = <20>;

		gpmc,wr-access-ns = <40>;

		gpmc,rd-cycle-ns = <40>;

		gpmc,wr-cycle-ns = <40>;

		gpmc,wait-pin = <0>;

		gpmc,wait-on-read;

		gpmc,wait-on-write;

		gpmc,bus-turnaround-ns = <0>;

		gpmc,cycle2cycle-delay-ns = <0>;

		gpmc,clk-activation-ns = <0>;

		gpmc,wait-monitoring-ns = <0>;

		gpmc,wr-data-mux-bus-ns = <0>;

		/* MTD partition table */

		/* All SPL-* partitions are sized to minimal length

		 * which can be independently programmable. For

		 * NAND flash this is equal to size of erase-block */

		#address-cells = <1>;

		#size-cells = <1>;

		partition@0 {

			label = "NAND.SPL";

			reg = <0x00000000 0x000020000>;

		};

		partition@1 {

			label = "NAND.SPL.backup1";

			reg = <0x00020000 0x00020000>;

		};

		partition@2 {

			label = "NAND.SPL.backup2";

			reg = <0x00040000 0x00020000>;

		};

		partition@3 {

			label = "NAND.SPL.backup3";

			reg = <0x00060000 0x00020000>;

		};

		partition@4 {

			label = "NAND.u-boot-spl-os";

			reg = <0x00080000 0x00040000>;

		};

		partition@5 {

			label = "NAND.u-boot";

			reg = <0x000c0000 0x00100000>;

		};

		partition@6 {

			label = "NAND.u-boot-env";

			reg = <0x001c0000 0x00020000>;

		};

		partition@7 {

			label = "NAND.u-boot-env";

			reg = <0x001e0000 0x00020000>;

		};

		partition@8 {

			label = "NAND.kernel";

			reg = <0x00200000 0x00800000>;

		};

		partition@9 {

			label = "NAND.file-system";

			reg = <0x00a00000 0x0f600000>;

		};

	};

};

arch/arm/boot/dts/dra7.dtsi

+20 −0
Original line number Diff line number Diff line
@@ -964,6 +964,26 @@ 
				dr_mode = "otg";

			};

		};



		elm: elm@48078000 {

			compatible = "ti,am3352-elm";

			reg = <0x48078000 0xfc0>;      /* device IO registers */

			interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;

			ti,hwmods = "elm";

			status = "disabled";

		};



		gpmc: gpmc@50000000 {

			compatible = "ti,am3352-gpmc";

			ti,hwmods = "gpmc";

			reg = <0x50000000 0x37c>;      /* device IO registers */

			interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;

			gpmc,num-cs = <8>;

			gpmc,num-waitpins = <2>;

			#address-cells = <2>;

			#size-cells = <1>;

			status = "disabled";

		};

	};

};

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