ARM: i.MX6: add support for Digi CCIMX6UL SBC Pro

Add support for the Digi CCIMX6UL SBC Pro.
It is based on the Digi CCIMX6UL SOM with 256MB RAM and 256MB NAND
flash.

v2:
- fix includes
- rename folder to som
- switch to compressed dtb
- remove the unnecessary get_runtime_offset
all from Ahmad Fatoum

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

10 files changed, 233 insertions, 1 deletions

diff --git a/Documentation/boards/imx/digi-ccimx6ulsbcpro.rst b/Documentation/boards/imx/digi-ccimx6ulsbcpro.rst
new file mode 100644
index 0000000000..bcb2ec2f07
--- /dev/null
+++ b/Documentation/boards/imx/digi-ccimx6ulsbcpro.rst
@@ -0,0 +1,26 @@
+Digi CC-IMX6UL-SBC-PRO
+======================
+
+This board is based on the i.MX6UL SoC.
+
+The SBC Pro is shipped with:
+
+  * 256MiB NAND flash
+  * 256MiB DDR3 SDRAM
+
+see https://www.digi.com/products/embedded-systems/single-board-computers/connectcore-for-i-mx6ul-sbc-pro
+for more information.
+
+MAC addresses
+-------------
+The Digi modules save their MAC addresses not in the OCOTP nodes, but in the
+U-Boot environment. It is advised to boot the board using the shipped U-Boot
+Bootloader and to read out and save the MAC addresses for the board.
+The environment variables which contain the addresses are `$ethaddr` and
+`$eth1addr`.
+The MAC addresses can than be persisted to the barebox environment by using
+
+.. code-block:: sh
+
+  nv dev.eth0.ethaddr=<eth0addr>
+  nv dev.eth1.ethaddr=<eth1addr>
diff --git a/arch/arm/boards/Makefile b/arch/arm/boards/Makefile
index cbd6bd1ed6..bdf78d068d 100644
--- a/arch/arm/boards/Makefile
+++ b/arch/arm/boards/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_MACH_CFA10036)			+= crystalfontz-cfa10036/
 obj-$(CONFIG_MACH_CHUMBY)			+= chumby_falconwing/
 obj-$(CONFIG_MACH_CLEP7212)			+= clep7212/
 obj-$(CONFIG_MACH_DFI_FS700_M60)		+= dfi-fs700-m60/
+obj-$(CONFIG_MACH_DIGI_CCIMX6ULSBCPRO)		+= digi-ccimx6ulsom/
 obj-$(CONFIG_MACH_DUCKBILL)			+= duckbill/
 obj-$(CONFIG_MACH_DSS11)			+= dss11/
 obj-$(CONFIG_MACH_EDB93012)			+= edb93xx/
@@ -166,4 +167,4 @@ obj-$(CONFIG_MACH_ZII_VF610_DEV)		+= zii-vf610-dev/
 obj-$(CONFIG_MACH_ZII_IMX7D_RPU2)		+= zii-imx7d-rpu2/
 obj-$(CONFIG_MACH_WAGO_PFC_AM35XX)		+= wago-pfc-am35xx/
 obj-$(CONFIG_MACH_LS1046ARDB)			+= ls1046ardb/
-obj-$(CONFIG_MACH_TQMLS1046A)			+= tqmls1046a/
\ No newline at end of file
+obj-$(CONFIG_MACH_TQMLS1046A)			+= tqmls1046a/
diff --git a/arch/arm/boards/digi-ccimx6ulsom/Makefile b/arch/arm/boards/digi-ccimx6ulsom/Makefile
new file mode 100644
index 0000000000..01c7a259e9
--- /dev/null
+++ b/arch/arm/boards/digi-ccimx6ulsom/Makefile
@@ -0,0 +1,2 @@
+obj-y += board.o
+lwl-y += lowlevel.o
diff --git a/arch/arm/boards/digi-ccimx6ulsom/board.c b/arch/arm/boards/digi-ccimx6ulsom/board.c
new file mode 100644
index 0000000000..1fb451548f
--- /dev/null
+++ b/arch/arm/boards/digi-ccimx6ulsom/board.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 Rouven Czerwinski, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <mach/generic.h>
+#include <mach/bbu.h>
+
+static int digi_ccimx6ulsbcpro_device_init(void)
+{
+	if (!of_machine_is_compatible("digi,ccimx6ulsbcpro"))
+		return 0;
+
+	imx6_bbu_nand_register_handler("nand", BBU_HANDLER_FLAG_DEFAULT);
+
+	barebox_set_hostname("ccimx6ulsbcpro");
+
+	return 0;
+}
+device_initcall(digi_ccimx6ulsbcpro_device_init);
diff --git a/arch/arm/boards/digi-ccimx6ulsom/flash-header-imx6ul-ccimx6ulsbcpro.imxcfg b/arch/arm/boards/digi-ccimx6ulsom/flash-header-imx6ul-ccimx6ulsbcpro.imxcfg
new file mode 100644
index 0000000000..36edad7a3e
--- /dev/null
+++ b/arch/arm/boards/digi-ccimx6ulsom/flash-header-imx6ul-ccimx6ulsbcpro.imxcfg
@@ -0,0 +1,82 @@
+loadaddr 0x80000000
+soc imx6
+dcdofs 0x400
+
+/* Enable all clocks */
+wm 32 0x020c4068 0xffffffff
+wm 32 0x020c406c 0xffffffff
+wm 32 0x020c4070 0xffffffff
+wm 32 0x020c4074 0xffffffff
+wm 32 0x020c4078 0xffffffff
+wm 32 0x020c407c 0xffffffff
+wm 32 0x020c4080 0xffffffff
+
+/* IOMUX */
+/* DDR IO type */
+wm 32 0x020E04B4 0x000C0000
+wm 32 0x020E04AC 0x00000000
+/* Clock */
+wm 32 0x020E027C 0x00000030
+/* Control */
+wm 32 0x020E0250 0x00000030
+wm 32 0x020E024C 0x00000030
+wm 32 0x020E0490 0x00000030
+wm 32 0x020E0288 0x00000030
+wm 32 0x020E0270 0x00000000
+wm 32 0x020E0260 0x00000030
+wm 32 0x020E0264 0x00000030
+wm 32 0x020E04A0 0x00000030
+/* Data strobe */
+wm 32 0x020E0494 0x00020000
+wm 32 0x020E0280 0x00000030
+wm 32 0x020E0284 0x00000030
+/* Data */
+wm 32 0x020E04B0 0x00020000
+wm 32 0x020E0498 0x00000030
+wm 32 0x020E04A4 0x00000030
+wm 32 0x020E0244 0x00000030
+wm 32 0x020E0248 0x00000030
+
+/* DDR Controller registers */
+wm 32 0x021B001C 0x00008000
+wm 32 0x021B0800 0xA1390003
+/* Calibration values */
+wm 32 0x021B080C 0x00000000
+wm 32 0x021B083C 0x413B013B
+wm 32 0x021B0848 0x4040373E
+wm 32 0x021B0850 0x40405954
+wm 32 0x021B081C 0x33333333
+wm 32 0x021B0820 0x33333333
+wm 32 0x021B082C 0xf3333333
+wm 32 0x021B0830 0xf3333333
+/* END of calibration values */
+wm 32 0x021B08C0 0x00921012
+wm 32 0x021B08b8 0x00000800
+
+/* MMDC init */
+wm 32 0x021B0004 0x0002002D
+wm 32 0x021B0008 0x1b333030
+wm 32 0x021B000C 0x676B52F3
+wm 32 0x021B0010 0xB66D0B63
+wm 32 0x021B0014 0x01FF00DB
+/* Consider reducing RALAT (currently set to 5) */
+wm 32 0x021B0018 0x00201740
+wm 32 0x021B001C 0x00008000
+wm 32 0x021B002C 0x000026D2
+wm 32 0x021B0030 0x006B1023
+wm 32 0x021B0040 0x00000047
+wm 32 0x021B0000 0x83180000
+
+/* Mode registers writes for CS0 */
+wm 32 0x021B001C 0x02008032
+wm 32 0x021B001C 0x00008033
+wm 32 0x021B001C 0x00048031
+wm 32 0x021B001C 0x15208030
+wm 32 0x021B001C 0x04008040
+
+/* Final DDR setup */
+wm 32 0x021B0020 0x00000800
+wm 32 0x021B0818 0x00000227
+wm 32 0x021B0004 0x0002552D
+wm 32 0x021B0404 0x00011006
+wm 32 0x021B001C 0x00000000
diff --git a/arch/arm/boards/digi-ccimx6ulsom/lowlevel.c b/arch/arm/boards/digi-ccimx6ulsom/lowlevel.c
new file mode 100644
index 0000000000..ac76a843ac
--- /dev/null
+++ b/arch/arm/boards/digi-ccimx6ulsom/lowlevel.c
@@ -0,0 +1,32 @@
+#include <common.h>
+#include <mach/generic.h>
+#include <asm/barebox-arm.h>
+#include <mach/esdctl.h>
+#include <asm/cache.h>
+
+
+extern char __dtb_z_imx6ul_ccimx6ulsbcpro_start[];
+
+ENTRY_FUNCTION(start_imx6ul_ccimx6ulsbcpro, r0, r1, r2)
+{
+	void *fdt;
+
+	imx6ul_cpu_lowlevel_init();
+
+	arm_setup_stack(0x00910000 - 8);
+
+	arm_early_mmu_cache_invalidate();
+
+	relocate_to_current_adr();
+	setup_c();
+	barrier();
+
+	/* disable all watchdog powerdown counters */
+	writew(0x0, 0x020bc008);
+	writew(0x0, 0x020c0008);
+	writew(0x0, 0x021e4008);
+
+	fdt = __dtb_z_imx6ul_ccimx6ulsbcpro_start;
+
+	imx6ul_barebox_entry(fdt);
+}
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index c3292354a1..561653930b 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -23,6 +23,7 @@ pbl-dtb-$(CONFIG_MACH_FREESCALE_MX53_LOCO) += imx53-qsb.dtb.o imx53-qsrb.dtb.o
 pbl-dtb-$(CONFIG_MACH_TX53) += imx53-tx53-xx30.dtb.o imx53-tx53-1011.dtb.o
 pbl-dtb-$(CONFIG_MACH_CCMX51) += imx51-ccxmx51.dtb.o
 pbl-dtb-$(CONFIG_MACH_CCMX53) += imx53-ccxmx53.dtb.o
+pbl-dtb-$(CONFIG_MACH_DIGI_CCIMX6ULSBCPRO) += imx6ul-ccimx6ulsbcpro.dtb.o
 pbl-dtb-$(CONFIG_MACH_FREESCALE_MX53_VMX53) += imx53-voipac-bsb.dtb.o
 pbl-dtb-$(CONFIG_MACH_FREESCALE_MX7_SABRESD) += imx7d-sdb.dtb.o
 pbl-dtb-$(CONFIG_MACH_GK802) += imx6q-gk802.dtb.o
diff --git a/arch/arm/dts/imx6ul-ccimx6ulsbcpro.dts b/arch/arm/dts/imx6ul-ccimx6ulsbcpro.dts
new file mode 100644
index 0000000000..1139c4b7d6
--- /dev/null
+++ b/arch/arm/dts/imx6ul-ccimx6ulsbcpro.dts
@@ -0,0 +1,41 @@
+#include <arm/imx6ul-ccimx6ulsbcpro.dts>
+
+/{
+	chosen {
+		stdout-path = &uart5;
+
+		environment-nand {
+			compatible = "barebox,environment";
+			device-path = &gpmi, "partname:barebox-environment";
+			status = "okay";
+		};
+	};
+};
+
+&gpmi {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_gpmi_nand>;
+	nand-on-flash-bbt;
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "barebox";
+			reg = <0x0 0x400000>;
+		};
+
+		partition@400000 {
+			label = "barebox-environment";
+			reg = <0x400000 0x100000>;
+		};
+
+		partition@500000 {
+			label = "root";
+			reg = <0x500000 0x0>;
+		};
+	};
+};
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 71d37cee90..6a6aab634c 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -505,6 +505,12 @@ config MACH_GRINN_LITEBOARD
 	bool "Grinn liteboard"
 	select ARCH_IMX6UL
 
+config MACH_DIGI_CCIMX6ULSBCPRO
+	bool "Digi Internal CC-IMX6UL SBC Pro"
+	select ARCH_IMX6
+	select ARCH_IMX6UL
+	select ARM_USE_COMPRESSED_DTB
+
 endif
 
 # ----------------------------------------------------------
diff --git a/images/Makefile.imx b/images/Makefile.imx
index e6f741cdb4..9a7187ac78 100644
--- a/images/Makefile.imx
+++ b/images/Makefile.imx
@@ -519,6 +519,11 @@ CFG_start_imx6ul_pico_hobbit_512mb.pblb.imximg = $(board)/technexion-pico-hobbit
 FILE_barebox-imx6ul-pico-hobbit-512mb.img = start_imx6ul_pico_hobbit_512mb.pblb.imximg
 image-$(CONFIG_MACH_TECHNEXION_PICO_HOBBIT) += barebox-imx6ul-pico-hobbit-512mb.img
 
+pblb-$(CONFIG_MACH_DIGI_CCIMX6ULSBCPRO) += start_imx6ul_ccimx6ulsbcpro
+CFG_start_imx6ul_ccimx6ulsbcpro.pblb.imximg = $(board)/digi-ccimx6ulsom/flash-header-imx6ul-ccimx6ulsbcpro.imxcfg
+FILE_barebox-imx6ul-ccimx6ulsbcpro.img = start_imx6ul_ccimx6ulsbcpro.pblb.imximg
+image-$(CONFIG_MACH_DIGI_CCIMX6ULSBCPRO) += barebox-imx6ul-ccimx6ulsbcpro.img
+
 # ----------------------- vf6xx based boards ---------------------------
 pblb-$(CONFIG_MACH_VF610_TWR) += start_vf610_twr
 CFG_start_vf610_twr.pblb.imximg = $(board)/freescale-vf610-twr/flash-header-vf610-twr.imxcfg