On 03/12/2014 05:49 AM, Pekon Gupta wrote:
> Adds pinmux and DT node for Micron (MT29F4G08AB) x8 NAND device present on
> am437x-gp-evm board.
> (1) As NAND Flash data lines are muxed with eMMC, Thus at a given time either
> eMMC or NAND can be enabled. Selection between eMMC and NAND is controlled:
> (a) By dynamically driving following GPIO pin from software
> SPI2_CS0(GPIO) == 0 NAND is selected (default)
> SPI2_CS0(GPIO) == 1 eMMC is selected
> (b) By statically using Jumper (J89) on the board
>
> (2) As NAND device connnected to this board has page-size=4K and oob-size=224,
> So ROM code expects boot-loaders to be flashed in BCH16 ECC scheme for
> NAND boot.
>
> Signed-off-by: Pekon Gupta <pekon@xxxxxx>
> ---
> arch/arm/boot/dts/am437x-gp-evm.dts | 107 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 107 insertions(+)
>
> diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
> index df8798e..0027ea7 100644
> --- a/arch/arm/boot/dts/am437x-gp-evm.dts
> +++ b/arch/arm/boot/dts/am437x-gp-evm.dts
which branch does this apply on? I assume you mean this for Tony's
omap-for-v3.15/dt branch? it would be nice if you'd make that clear in
cover letter.
> @@ -81,6 +81,27 @@
> 0x164 MUX_MODE0 /* eCAP0_in_PWM0_out.eCAP0_in_PWM0_out MODE0 */
> >;
> };
> +
> + nand_flash_x8: nand_flash_x8 {
> + pinctrl-single,pins = <
> + 0x26C(PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* spi2_cs0.gpio/eMMCorNANDsel */
> + 0x0 (PIN_INPUT | MUX_MODE0) /* gpmc_ad0.gpmc_ad0 */
> + 0x4 (PIN_INPUT | MUX_MODE0) /* gpmc_ad1.gpmc_ad1 */
> + 0x8 (PIN_INPUT | MUX_MODE0) /* gpmc_ad2.gpmc_ad2 */
> + 0xc (PIN_INPUT | MUX_MODE0) /* gpmc_ad3.gpmc_ad3 */
> + 0x10 (PIN_INPUT | MUX_MODE0) /* gpmc_ad4.gpmc_ad4 */
> + 0x14 (PIN_INPUT | MUX_MODE0) /* gpmc_ad5.gpmc_ad5 */
> + 0x18 (PIN_INPUT | MUX_MODE0) /* gpmc_ad6.gpmc_ad6 */
> + 0x1c (PIN_INPUT | MUX_MODE0) /* gpmc_ad7.gpmc_ad7 */
> + 0x70 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_wait0.gpmc_wait0 */
> + 0x74 (PIN_OUTPUT_PULLUP | MUX_MODE7) /* gpmc_wpn.gpmc_wpn */
> + 0x7c (PIN_OUTPUT | MUX_MODE0) /* gpmc_csn0.gpmc_csn0 */
> + 0x90 (PIN_OUTPUT | MUX_MODE0) /* gpmc_advn_ale.gpmc_advn_ale */
> + 0x94 (PIN_OUTPUT | MUX_MODE0) /* gpmc_oen_ren.gpmc_oen_ren */
> + 0x98 (PIN_OUTPUT | MUX_MODE0) /* gpmc_wen.gpmc_wen */
> + 0x9c (PIN_OUTPUT | MUX_MODE0) /* gpmc_be0n_cle.gpmc_be0n_cle */
> + >;
> + };
> };
>
> &i2c0 {
> @@ -125,3 +146,89 @@
> pinctrl-0 = <&mmc1_pins>;
> cd-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;
> };
> +
> +&elm {
> + status = "okay";
> +};
> +
> +&gpmc {
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&nand_flash_x8>;
> + ranges = <0 0 0x08000000 0x10000000>; /* CS0: NAND */
> + nand@0,0 {
> + reg = <0 0 0>; /* CS0, offset 0 */
> + ti,nand-ecc-opt = "bch8";
> + ti,elm-id = <&elm>;
> + nand-bus-width = <8>;
> + gpmc,device-width = <1>;
> + 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 = <25>;
> + gpmc,adv-wr-off-ns = <25>;
> + gpmc,we-on-ns = <0>;
> + gpmc,we-off-ns = <20>;
> + gpmc,oe-on-ns = <3>;
> + gpmc,oe-off-ns = <30>;
> + gpmc,access-ns = <30>;
> + gpmc,rd-cycle-ns = <40>;
> + gpmc,wr-cycle-ns = <40>;
> + gpmc,wait-on-read = "true";
> + gpmc,wait-on-write = "true";
> + gpmc,bus-turnaround-ns = <0>;
> + gpmc,cycle2cycle-delay-ns = <0>;
> + gpmc,clk-activation-ns = <0>;
> + gpmc,wait-monitoring-ns = <0>;
> + gpmc,wr-access-ns = <40>;
> + 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 0x00040000>;
> + };
> + partition@1 {
> + label = "NAND.SPL.backup1";
> + reg = <0x00040000 0x00040000>;
> + };
> + partition@2 {
> + label = "NAND.SPL.backup2";
> + reg = <0x00080000 0x00040000>;
> + };
> + partition@3 {
> + label = "NAND.SPL.backup3";
> + reg = <0x000C0000 0x00040000>;
> + };
> + partition@4 {
> + label = "NAND.u-boot-spl-os";
> + reg = <0x00100000 0x00080000>;
> + };
> + partition@5 {
> + label = "NAND.u-boot";
> + reg = <0x00180000 0x00100000>;
> + };
> + partition@6 {
> + label = "NAND.u-boot-env";
> + reg = <0x00280000 0x00040000>;
> + };
> + partition@7 {
> + label = "NAND.u-boot-env.backup1";
> + reg = <0x002C0000 0x00040000>;
> + };
> + partition@8 {
> + label = "NAND.kernel";
> + reg = <0x00300000 0x00700000>;
> + };
> + partition@9 {
> + label = "NAND.file-system";
> + reg = <0x00A00000 0x1F600000>;
> + };
> + };
> +};
>
--
Regards,
Nishanth Menon
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