ARM: i.MX50: Add support for i.MX50 based Amazon Kindle e-book readers

The Kindle Model No. D01100 (Kindle Wi-Fi), D01200 (Kindle Touch)
and EY21 (Kindle Paperwhite) are refered as the Kindle 4th and 5th generation.
Those models are based on an i.MX50 SoC and use LPDDR1 or LPDDR2 Memory.

The devices boot in internal boot mode from a build-in eMMC, alternatively
some devices may be set into USB-downloader mode by pressing a specific key
at startup.

Add support for the i.MX50 based Kindle device and make barebox a drop-in
replacement for the factory shipped u-boot image.

Notable features:
- Support for eMMC, USB, UART, I2C, SPI and Keys (except keyboard).
- LPDDR1 and LPDDR2 setup is done via DCD, the same imximage may be used
  for USB-startup and for installation.
- Support for vendor specific ATAGs that are required for the Kindle-System.
- usbserial barebox console access by pressing Select button at startup,
  alternatively full console support on connector J14.

Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

5 files changed, 546 insertions, 0 deletions

diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index fe3f08ed0a..160b94311e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -12,6 +12,7 @@ pbl-dtb-$(CONFIG_MACH_BEAGLEBONE) += am335x-bone.dtb.o am335x-boneblack.dtb.o am
 pbl-dtb-$(CONFIG_MACH_CM_FX6) += imx6dl-cm-fx6.dtb.o imx6q-cm-fx6.dtb.o imx6q-utilite.dtb.o
 pbl-dtb-$(CONFIG_MACH_DFI_FS700_M60) += imx6q-dfi-fs700-m60-6q.dtb.o imx6dl-dfi-fs700-m60-6s.dtb.o
 pbl-dtb-$(CONFIG_MACH_DUCKBILL) += imx28-duckbill.dtb.o
+pbl-dtb-$(CONFIG_MACH_KINDLE_MX50) += imx50-kindle-d01100.dtb.o imx50-kindle-d01200.dtb.o imx50-kindle-ey21.dtb.o
 pbl-dtb-$(CONFIG_MACH_EFIKA_MX_SMARTBOOK) += imx51-genesi-efika-sb.dtb.o
 pbl-dtb-$(CONFIG_MACH_ELTEC_HIPERCAM) += imx6dl-eltec-hipercam.dtb.o
 pbl-dtb-$(CONFIG_MACH_EMBEST_RIOTBOARD) += imx6s-riotboard.dtb.o
diff --git a/arch/arm/dts/imx50-kindle-common.dtsi b/arch/arm/dts/imx50-kindle-common.dtsi
new file mode 100644
index 0000000000..a6ea504f6c
--- /dev/null
+++ b/arch/arm/dts/imx50-kindle-common.dtsi
@@ -0,0 +1,322 @@
+/*
+ * Copyright 2017 Alexander Kurz <akurz@blala.de>
+ * Copyright 2013 Greg Ungerer <gerg@uclinux.org>
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include "imx50.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	/* this is a dummy fixed-voltage "regulator", mainly to satisfy
+	* the esdhc implementation requiring vmmc-supply and vqmmc-supply
+	*/
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		reg_3p3v: regulator@0 {
+			compatible = "regulator-fixed";
+			reg = <0>;
+			regulator-name = "3P3V";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
+		};
+	};
+};
+
+&iomuxc {
+	imx50-kindle {
+		pinctrl_uart1: uart1grp {
+			fsl,pins = <
+				MX50_PAD_UART1_TXD__UART1_TXD_MUX	0xe4
+				MX50_PAD_UART1_RXD__UART1_RXD_MUX	0xe4
+			>;
+		};
+
+		pinctrl_ecspi2: ecspi2grp {
+			fsl,pins = <
+				MX50_PAD_ECSPI2_SCLK__ECSPI2_SCLK	0x84
+				MX50_PAD_ECSPI2_MOSI__ECSPI2_MOSI	0x84
+				MX50_PAD_ECSPI2_MISO__ECSPI2_MISO	0x84
+				MX50_PAD_ECSPI2_SS0__GPIO4_19		0x84
+			>;
+		};
+
+		pinctrl_cspi: cspigrp {
+			fsl,pins = <
+				MX50_PAD_CSPI_SCLK__CSPI_SCLK		0xc4
+				MX50_PAD_CSPI_MISO__CSPI_MISO		0xc4
+				MX50_PAD_CSPI_MOSI__CSPI_MOSI		0xc4
+				MX50_PAD_CSPI_SS0__GPIO4_11		0xe4
+			>;
+		};
+
+		pinctrl_pmic: pmicgrp {
+			fsl,pins = <
+				MX50_PAD_UART1_CTS__GPIO6_8		0x84
+				MX50_PAD_EPDC_PWRCTRL0__GPIO3_29	0x84
+			>;
+		};
+
+		pinctrl_esdhc3: esdhc3grp {
+			fsl,pins = <
+				MX50_PAD_SD3_CMD__ESDHC3_CMD		0xd4
+				MX50_PAD_SD3_CLK__ESDHC3_CLK		0x00
+				MX50_PAD_SD3_D0__ESDHC3_DAT0		0xd4
+				MX50_PAD_SD3_D1__ESDHC3_DAT1		0xd4
+				MX50_PAD_SD3_D2__ESDHC3_DAT2		0xd4
+				MX50_PAD_SD3_D3__ESDHC3_DAT3		0xd4
+				MX50_PAD_SD3_D4__ESDHC3_DAT4		0xd4
+				MX50_PAD_SD3_D5__ESDHC3_DAT5		0xd4
+				MX50_PAD_SD3_D6__ESDHC3_DAT6		0xd4
+				MX50_PAD_SD3_D7__ESDHC3_DAT7		0xd4
+			>;
+		};
+
+		pinctrl_esdhc2: esdhc2grp {
+			fsl,pins = <
+				MX50_PAD_SD2_CMD__ESDHC2_CMD		0x84
+				MX50_PAD_SD2_CLK__ESDHC2_CLK		0x84
+				MX50_PAD_SD2_D0__ESDHC2_DAT0		0x84
+				MX50_PAD_SD2_D1__ESDHC2_DAT1		0x84
+				MX50_PAD_SD2_D2__ESDHC2_DAT2		0x84
+				MX50_PAD_SD2_D3__ESDHC2_DAT3		0x84
+
+				MX50_PAD_EIM_DA5__GPIO1_5		0xe4 /* wake-on-lan */
+				MX50_PAD_SD3_WP__GPIO5_28		0x84 /* power */
+				MX50_PAD_DISP_RS__GPIO2_17		0xe4 /* ? */
+			>;
+		};
+
+		pinctrl_i2c1: i2c1grp {
+			fsl,pins = <
+				MX50_PAD_I2C1_SCL__I2C1_SCL	0x4000002c
+				MX50_PAD_I2C1_SDA__I2C1_SDA	0x4000002c
+			>;
+		};
+
+		pinctrl_i2c2: i2c2grp {
+			fsl,pins = <
+				MX50_PAD_I2C2_SCL__I2C2_SCL	0x4000002c
+				MX50_PAD_I2C2_SDA__I2C2_SDA	0x4000002c
+			>;
+		};
+
+		pinctrl_i2c3: i2c3grp {
+			fsl,pins = <
+				MX50_PAD_I2C3_SCL__I2C3_SCL	0x4000002c
+				MX50_PAD_I2C3_SDA__I2C3_SDA	0x4000002c
+			>;
+		};
+
+		pinctrl_charger_detect: chargerdetectgrp {
+			fsl,pins = <
+				MX50_PAD_OWIRE__GPIO6_26		0x84
+			>;
+		};
+	};
+};
+
+&uart1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart1>;
+	status = "okay";
+};
+
+&esdhc3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_esdhc3>;
+	non-removable;
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_3p3v>;
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		kernel: kernel@0x41000 {
+			label = "kernel";
+			reg = <0x41000 0xe00000>;
+		};
+
+		diags_kernel: diags_kernel@0xe41000 {
+			label = "diags_kernel";
+			reg = <0xe41000 0xe00000>;
+		};
+	};
+
+	boot0-partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		imx_header: imx_header@0x400 {
+			label = "imx_header";
+			reg = <0x400 0x800>;
+		};
+
+		self: self@0x1000 {
+			label = "self";
+			reg = <0x1000 0x3e000>;
+		};
+
+		userdata: userdata@0x3f000 {
+			label = "userdata";
+			reg = <0x3f000 0x1400>;
+		};
+	};
+};
+
+&ecspi2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ecspi2>;
+	fsl,spi-num-chipselects = <1>;
+	cs-gpios = <&gpio4 19 0>;
+	status = "okay";
+
+	flash: m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		spi-max-frequency = <1000000>;
+		reg = <0>;
+	};
+};
+
+&cspi {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_cspi>;
+	fsl,spi-num-chipselects = <1>;
+	cs-gpios = <&gpio4 11 0>;
+	status = "okay";
+
+	pmic: mc13892@0 {
+		compatible = "fsl,mc13892";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pmic>;
+		spi-max-frequency = <1000000>;
+		spi-cs-high;
+		reg = <0>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
+		fsl,mc13xxx-uses-rtc;
+
+		regulators {
+			sw1_reg: sw1 {
+				regulator-min-microvolt = <600000>;
+				regulator-max-microvolt = <1375000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw2_reg: sw2 {
+				regulator-min-microvolt = <900000>;
+				regulator-max-microvolt = <1850000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw3_reg: sw3 {
+				regulator-min-microvolt = <900000>;
+				regulator-max-microvolt = <1850000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw4_reg: sw4 {
+				regulator-min-microvolt = <1100000>;
+				regulator-max-microvolt = <1850000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vdig_reg: vdig {
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <1200000>;
+				regulator-boot-on;
+			};
+
+			vpll_reg: vpll {
+				regulator-min-microvolt = <1050000>;
+				regulator-max-microvolt = <1800000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vusb2_reg: vusb2 {
+				regulator-min-microvolt = <2400000>;
+				regulator-max-microvolt = <2775000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vvideo_reg: vvideo {
+				regulator-min-microvolt = <2775000>;
+				regulator-max-microvolt = <2775000>;
+			};
+
+			vaudio_reg: vaudio {
+				regulator-min-microvolt = <2300000>;
+				regulator-max-microvolt = <3000000>;
+			};
+
+			vsd_reg: vsd {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3150000>;
+			};
+
+			vcam_reg: vcam {
+				regulator-min-microvolt = <2500000>;
+				regulator-max-microvolt = <3000000>;
+			};
+
+			vgen1_reg: vgen1 {
+				regulator-min-microvolt = <3000000>;
+				regulator-max-microvolt = <3000000>;
+			};
+
+			vgen2_reg: vgen2 {
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <3150000>;
+				regulator-always-on;
+			};
+
+			vgen3_reg: vgen3 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+			};
+		};
+
+		leds {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			led-control = <0 0xff8 0 0>;
+			ledg {
+				reg = <2>;
+				label = "pmic_ledsg";
+				linux,default-trigger = "heartbeat";
+			};
+		};
+	};
+};
+
+&usbotg {
+	phy_type = "utmi";
+	dr_mode = "peripheral";
+	status = "okay";
+};
diff --git a/arch/arm/dts/imx50-kindle-d01100.dts b/arch/arm/dts/imx50-kindle-d01100.dts
new file mode 100644
index 0000000000..edbc929120
--- /dev/null
+++ b/arch/arm/dts/imx50-kindle-d01100.dts
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2017 Alexander Kurz <akurz@blala.de>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+#include "imx50-kindle-common.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "Amazon Kindle D01100";
+	compatible = "fsl,imx50";
+
+	chosen {
+		linux,stdout-path = &uart1;
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x70000000 0x10000000>;
+	};
+};
+
+&iomuxc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog>;
+
+	imx50-kindle-d01100 {
+                pinctrl_hog: hoggrp {
+                        fsl,pins = <
+				MX50_PAD_EIM_EB1__GPIO1_20		0xc0
+				MX50_PAD_EIM_EB0__GPIO1_19		0xc0
+				MX50_PAD_EIM_CS2__GPIO1_16		0xc0
+				MX50_PAD_EIM_CS1__GPIO1_17		0xc0
+				MX50_PAD_EIM_CS0__GPIO1_18		0xc0
+				MX50_PAD_SSI_RXC__GPIO6_5		0x84
+			>;
+		};
+	};
+};
+
+&i2c2 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	status = "okay";
+
+	max14656@35 {
+		compatible = "maxim,max14656";
+		reg = <0x35>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_charger_detect>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <26 IRQ_TYPE_LEVEL_HIGH>;
+        };
+
+	smart-battery@55 {
+		compatible = "ti,bq27210";
+		reg = <0x55>;
+		ti,i2c-retry-count = <2>;
+		ti,poll-retry-count = <10>;
+	};
+};
diff --git a/arch/arm/dts/imx50-kindle-d01200.dts b/arch/arm/dts/imx50-kindle-d01200.dts
new file mode 100644
index 0000000000..8f93c1b520
--- /dev/null
+++ b/arch/arm/dts/imx50-kindle-d01200.dts
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 Alexander Kurz <akurz@blala.de>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+#include "imx50-kindle-common.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "Amazon Kindle D01200";
+	compatible = "fsl,imx50";
+
+	chosen {
+		linux,stdout-path = &uart1;
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x70000000 0x10000000>;
+	};
+};
+
+&iomuxc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_hog>;
+
+	imx50-kindle-d01200 {
+		pinctrl_hog: hoggrp {
+			fsl,pins = <
+				MX50_PAD_EIM_DA0__GPIO1_0	0xc0
+				MX50_PAD_SSI_RXC__GPIO6_5	0x84
+			>;
+		};
+	};
+};
+
+&i2c1 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c1>;
+	status = "okay";
+
+	mma8453: mma8453@1c {
+		compatible = "fsl,mma8453";
+		reg = <0x1c>;
+	};
+};
+
+&i2c2 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	status = "okay";
+
+	max14656@35 {
+		compatible = "maxim,max14656";
+		reg = <0x35>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_charger_detect>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <26 IRQ_TYPE_LEVEL_HIGH>;
+        };
+
+	smart-battery@55 {
+		compatible = "ti,bq27210";
+		reg = <0x55>;
+		ti,i2c-retry-count = <2>;
+		ti,poll-retry-count = <10>;
+	};
+};
+
+&i2c3 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c3>;
+	status = "okay";
+};
diff --git a/arch/arm/dts/imx50-kindle-ey21.dts b/arch/arm/dts/imx50-kindle-ey21.dts
new file mode 100644
index 0000000000..1b8f2ad89a
--- /dev/null
+++ b/arch/arm/dts/imx50-kindle-ey21.dts
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2017 Alexander Kurz <akurz@blala.de>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+#include "imx50-kindle-common.dtsi"
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "Amazon Kindle EY21";
+	compatible = "fsl,imx50";
+
+	memory {
+		device_type = "memory";
+		reg = <0x70000000 0x10000000>;
+	};
+};
+
+&iomuxc {
+	imx50-kindle-ey21 {
+		pinctrl_gpiokey: gpiokeygrp {
+			fsl,pins = <
+				MX50_PAD_EIM_EB1__GPIO1_20		0x40
+			>;
+		};
+	};
+};
+
+&i2c2 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	status = "okay";
+
+	max14656@35 {
+		compatible = "maxim,max14656";
+		reg = <0x35>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_charger_detect>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <26 IRQ_TYPE_LEVEL_HIGH>;
+        };
+
+	smart-battery@55 {
+		compatible = "ti,bq27210";
+		reg = <0x55>;
+		ti,i2c-retry-count = <2>;
+		ti,poll-retry-count = <10>;
+	};
+};
+
+&i2c3 {
+	clock-frequency = <50000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c3>;
+	status = "okay";
+};