ARM: dts: am437x-gp-evm: add support for parallel NAND flash

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@ti.com>
Reviewed-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 108 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
index 30ace1b399ee..f432685957b8 100644
--- a/arch/arm/boot/dts/am437x-gp-evm.dts
+++ b/arch/arm/boot/dts/am437x-gp-evm.dts
@@ -150,6 +150,27 @@
                         0x14c (PIN_INPUT_PULLDOWN | MUX_MODE7)
                 >;
         };
+
+        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 {
@@ -246,3 +267,90 @@
         phy_id = <&davinci_mdio>, <0>;
         phy-mode = "rgmii";
 };
+
+&elm {
+        status = "okay";
+};
+
+&gpmc {
+        status = "okay";
+        pinctrl-names = "default";
+        pinctrl-0 = <&nand_flash_x8>;
+        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 = <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-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-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>;
+                };
+        };
+};