pico-imx6: Add initial support

Add the initial support for the pico-imx6 variants.

DDR initialization is based on the TechNexion's U-Boot code.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

6 files changed, 483 insertions, 0 deletions

diff --git a/board/technexion/pico-imx6/Kconfig b/board/technexion/pico-imx6/Kconfig
new file mode 100644
index 0000000000..4af18e53bc
--- /dev/null
+++ b/board/technexion/pico-imx6/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_PICO_IMX6
+
+config SYS_BOARD
+	default "pico-imx6"
+
+config SYS_VENDOR
+	default "technexion"
+
+config SYS_SOC
+	default "mx6"
+
+config SYS_CONFIG_NAME
+	default "pico-imx6"
+
+endif
diff --git a/board/technexion/pico-imx6/MAINTAINERS b/board/technexion/pico-imx6/MAINTAINERS
new file mode 100644
index 0000000000..dd6fb96e44
--- /dev/null
+++ b/board/technexion/pico-imx6/MAINTAINERS
@@ -0,0 +1,9 @@
+TECHNEXION PICO-IMX6 BOARD
+M:	Fabio Estevam <festevam@gmail.com>
+S:	Maintained
+F:	arch/arm/dts/imx6qdl-pico.dtsi
+F:	arch/arm/dts/imx6q-pico.dts
+F:	arch/arm/dts/imx6dl-pico.dts
+F:	board/technexion/pico-imx6/
+F:	include/configs/pico-imx6.h
+F:	configs/pico-imx6_defconfig
diff --git a/board/technexion/pico-imx6/Makefile b/board/technexion/pico-imx6/Makefile
new file mode 100644
index 0000000000..ddb1604f1d
--- /dev/null
+++ b/board/technexion/pico-imx6/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2013 Freescale Semiconductor, Inc.
+
+obj-y  := pico-imx6.o spl.o
diff --git a/board/technexion/pico-imx6/README b/board/technexion/pico-imx6/README
new file mode 100644
index 0000000000..f1e84bfe82
--- /dev/null
+++ b/board/technexion/pico-imx6/README
@@ -0,0 +1,73 @@
+How to Update U-Boot on pico-imx6q/dl boards
+--------------------------------------------
+
+Required software on the host PC:
+
+- UUU: https://github.com/NXPmicro/mfgtools
+
+Build U-Boot for pico:
+
+$ make mrproper
+$ make pico-imx6_defconfig
+$ make
+
+This generates the SPL and u-boot-dtb.img binaries.
+
+1. Loading U-Boot via USB Serial Download Protocol
+
+Note: This method is convenient for development purposes.
+If the eMMC has already a U-Boot flashed then the user can
+go to step 2 below in order to update U-Boot.
+
+Put pico board in USB download mode (Refer to the following link for details:
+https://www.technexion.com/support/knowledgebase/boot-configuration-settings-for-pico-baseboards/).
+
+Connect a USB to serial adapter between the host PC and pico.
+
+Connect a USB cable between the OTG pico port and the host PC.
+
+Open a terminal program such as minicom.
+
+Copy SPL and u-boot-dtb.img to the uuu folder.
+
+Load the U-Boot via USB:
+
+$ sudo ./uuu -v uuu_script
+
+where uuu_script contains the following:
+
+SDP:  boot -f SPL
+SDPU: write -f u-boot-dtb.img -addr 0x10000000
+SDPU: jump -addr 0x10000000
+
+Then U-Boot starts and its messages appear in the console program.
+
+Use the default environment variables:
+
+=> env default -f -a
+=> saveenv
+
+2. Flashing U-Boot into the eMMC
+
+The  default  U-Boot   environment  expects  the  use   of  eMMC  user
+partition. To ensure we are using  the proper eMMC partition for boot,
+please run:
+
+=> mmc partconf 0 0 0 0
+
+Next, run the DFU agent so we can flash the new images using dfu-util
+tool:
+
+=> dfu 0 mmc 0
+
+Flash SPL and u-boot-dtb.img into the eMMC running the following commands on a PC:
+
+$ sudo dfu-util -D SPL -a spl
+
+$ sudo dfu-util -D u-boot-dtb.img -a u-boot
+
+Remove power from the pico board.
+
+Put pico board into normal boot mode.
+
+Power up the board and the new updated U-Boot should boot from eMMC.
diff --git a/board/technexion/pico-imx6/pico-imx6.c b/board/technexion/pico-imx6/pico-imx6.c
new file mode 100644
index 0000000000..717f20d9d7
--- /dev/null
+++ b/board/technexion/pico-imx6/pico-imx6.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ * Copyright (C) 2014 O.S. Systems Software LTDA.
+ *
+ * Author: Fabio Estevam <festevam@gmail.com>
+ */
+
+#include <asm/arch/clock.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/arch/iomux.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/mx6-pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/gpio.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm/io.h>
+#include <linux/sizes.h>
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define UART_PAD_CTRL  (PAD_CTL_PUS_100K_UP |			\
+	PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm |			\
+	PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+int dram_init(void)
+{
+	gd->ram_size = imx_ddr_size();
+
+	return 0;
+}
+
+static iomux_v3_cfg_t const uart1_pads[] = {
+	IOMUX_PADS(PAD_CSI0_DAT10__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+	IOMUX_PADS(PAD_CSI0_DAT11__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+};
+
+static void setup_iomux_uart(void)
+{
+	SETUP_IOMUX_PADS(uart1_pads);
+}
+
+int board_early_init_f(void)
+{
+	setup_iomux_uart();
+
+	return 0;
+}
+
+int overwrite_console(void)
+{
+	return 1;
+}
+
+int board_late_init(void)
+{
+	if (is_mx6dq())
+		env_set("board_rev", "MX6Q");
+	else
+		env_set("board_rev", "MX6DL");
+
+	return 0;
+}
+
+int board_init(void)
+{
+	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
+
+	return 0;
+}
+
+int checkboard(void)
+{
+	puts("Board: PICO-IMX6\n");
+
+	return 0;
+}
diff --git a/board/technexion/pico-imx6/spl.c b/board/technexion/pico-imx6/spl.c
new file mode 100644
index 0000000000..5bf87023ac
--- /dev/null
+++ b/board/technexion/pico-imx6/spl.c
@@ -0,0 +1,303 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Technexion Ltd.
+ *
+ * Author: Richard Hu <richard.hu@technexion.com>
+ *	   Fabio Estevam <festevam@gmail.com>
+ */
+
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/iomux.h>
+#include <asm/arch/mx6-pins.h>
+#include <linux/errno.h>
+#include <asm/gpio.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm/mach-imx/video.h>
+#include <mmc.h>
+#include <fsl_esdhc_imx.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+#include <spl.h>
+
+#if defined(CONFIG_SPL_BUILD)
+#include <asm/arch/mx6-ddr.h>
+
+#define IMX6DQ_DRIVE_STRENGTH		0x30
+#define IMX6SDL_DRIVE_STRENGTH		0x28
+
+/* configure MX6Q/DUAL mmdc DDR io registers */
+static struct mx6dq_iomux_ddr_regs mx6dq_ddr_ioregs = {
+	.dram_sdclk_0 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdclk_1 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_cas = IMX6DQ_DRIVE_STRENGTH,
+	.dram_ras = IMX6DQ_DRIVE_STRENGTH,
+	.dram_reset = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdcke0 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdcke1 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdba2 = 0x00000000,
+	.dram_sdodt0 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdodt1 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs0 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs1 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs2 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs3 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs4 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs5 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs6 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_sdqs7 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm0 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm1 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm2 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm3 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm4 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm5 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm6 = IMX6DQ_DRIVE_STRENGTH,
+	.dram_dqm7 = IMX6DQ_DRIVE_STRENGTH,
+};
+
+/* configure MX6Q/DUAL mmdc GRP io registers */
+static struct mx6dq_iomux_grp_regs mx6dq_grp_ioregs = {
+	.grp_ddr_type = 0x000c0000,
+	.grp_ddrmode_ctl = 0x00020000,
+	.grp_ddrpke = 0x00000000,
+	.grp_addds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_ctlds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_ddrmode = 0x00020000,
+	.grp_b0ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b1ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b2ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b3ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b4ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b5ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b6ds = IMX6DQ_DRIVE_STRENGTH,
+	.grp_b7ds = IMX6DQ_DRIVE_STRENGTH,
+};
+
+/* configure MX6SOLO/DUALLITE mmdc DDR io registers */
+struct mx6sdl_iomux_ddr_regs mx6sdl_ddr_ioregs = {
+	.dram_sdclk_0 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdclk_1 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_cas = IMX6SDL_DRIVE_STRENGTH,
+	.dram_ras = IMX6SDL_DRIVE_STRENGTH,
+	.dram_reset = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdcke0 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdcke1 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdba2 = 0x00000000,
+	.dram_sdodt0 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdodt1 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs0 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs1 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs2 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs3 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs4 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs5 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs6 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_sdqs7 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm0 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm1 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm2 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm3 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm4 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm5 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm6 = IMX6SDL_DRIVE_STRENGTH,
+	.dram_dqm7 = IMX6SDL_DRIVE_STRENGTH,
+};
+
+/* configure MX6SOLO/DUALLITE mmdc GRP io registers */
+struct mx6sdl_iomux_grp_regs mx6sdl_grp_ioregs = {
+	.grp_ddr_type = 0x000c0000,
+	.grp_ddrmode_ctl = 0x00020000,
+	.grp_ddrpke = 0x00000000,
+	.grp_addds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_ctlds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_ddrmode = 0x00020000,
+	.grp_b0ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b1ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b2ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b3ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b4ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b5ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b6ds = IMX6SDL_DRIVE_STRENGTH,
+	.grp_b7ds = IMX6SDL_DRIVE_STRENGTH,
+};
+
+/* H5T04G63AFR-PB for i.mx6Solo/DL operating DDR at 400MHz */
+static struct mx6_ddr3_cfg h5t04g63afr = {
+	.mem_speed = 800,
+	.density = 4,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 15,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1500,
+	.trcmin = 5250,
+	.trasmin = 3750,
+};
+
+/* H5TQ2G63FFR-H9 for i.mx6Solo/DL operating DDR at 400MHz */
+static struct mx6_ddr3_cfg h5tq2g63ffr = {
+	.mem_speed = 800,
+	.density = 2,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1500,
+	.trcmin = 5250,
+	.trasmin = 3750,
+};
+
+static struct mx6_mmdc_calibration mx6q_1g_mmdc_calib = {
+	.p0_mpwldectrl0 = 0x00000000,
+	.p0_mpwldectrl1 = 0x00000000,
+	.p1_mpwldectrl0 = 0x00000000,
+	.p1_mpwldectrl1 = 0x00000000,
+	.p0_mpdgctrl0 = 0x032C0340,
+	.p0_mpdgctrl1 = 0x03300324,
+	.p1_mpdgctrl0 = 0x032C0338,
+	.p1_mpdgctrl1 = 0x03300274,
+	.p0_mprddlctl = 0x423A383E,
+	.p1_mprddlctl = 0x3638323E,
+	.p0_mpwrdlctl = 0x363C4640,
+	.p1_mpwrdlctl = 0x4034423C,
+};
+
+/* DDR 32bit */
+static struct mx6_ddr_sysinfo mem_s = {
+	.dsize		= 1,
+	.cs1_mirror	= 0,
+	/* config for full 4GB range so that get_mem_size() works */
+	.cs_density	= 32,
+	.ncs		= 1,
+	.bi_on		= 1,
+	.rtt_nom	= 1,
+	.rtt_wr		= 0,
+	.ralat		= 5,
+	.walat		= 0,
+	.mif3_mode	= 3,
+	.rst_to_cke	= 0x23,
+	.sde_to_rst	= 0x10,
+};
+
+static struct mx6_mmdc_calibration mx6dl_1g_mmdc_calib = {
+	.p0_mpwldectrl0 = 0x001f001f,
+	.p0_mpwldectrl1 = 0x001f001f,
+	.p1_mpwldectrl0 = 0x001f001f,
+	.p1_mpwldectrl1 = 0x001f001f,
+	.p0_mpdgctrl0 = 0x420e020e,
+	.p0_mpdgctrl1 = 0x02000200,
+	.p1_mpdgctrl0 = 0x42020202,
+	.p1_mpdgctrl1 = 0x01720172,
+	.p0_mprddlctl = 0x494c4f4c,
+	.p1_mprddlctl = 0x4a4c4c49,
+	.p0_mpwrdlctl = 0x3f3f3133,
+	.p1_mpwrdlctl = 0x39373f2e,
+};
+
+static struct mx6_mmdc_calibration mx6s_512m_mmdc_calib = {
+	.p0_mpwldectrl0 = 0x0040003c,
+	.p0_mpwldectrl1 = 0x0032003e,
+	.p0_mpdgctrl0 = 0x42350231,
+	.p0_mpdgctrl1 = 0x021a0218,
+	.p0_mprddlctl = 0x4b4b4e49,
+	.p0_mpwrdlctl = 0x3f3f3035,
+};
+
+static void ccgr_init(void)
+{
+	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	writel(0x00C03F3F, &ccm->CCGR0);
+	writel(0x0030FC03, &ccm->CCGR1);
+	writel(0x0FFFC000, &ccm->CCGR2);
+	writel(0x3FF03000, &ccm->CCGR3);
+	writel(0x00FFF300, &ccm->CCGR4);
+	writel(0x0F0000C3, &ccm->CCGR5);
+	writel(0x000003FF, &ccm->CCGR6);
+}
+
+static void spl_dram_init(void)
+{
+	if (is_mx6solo()) {
+		mx6sdl_dram_iocfg(32, &mx6sdl_ddr_ioregs, &mx6sdl_grp_ioregs);
+		mx6_dram_cfg(&mem_s, &mx6s_512m_mmdc_calib, &h5tq2g63ffr);
+	} else if (is_mx6dl()) {
+		mx6sdl_dram_iocfg(32, &mx6sdl_ddr_ioregs, &mx6sdl_grp_ioregs);
+		mx6_dram_cfg(&mem_s, &mx6dl_1g_mmdc_calib, &h5t04g63afr);
+	} else if (is_mx6dq()) {
+		mx6dq_dram_iocfg(32, &mx6dq_ddr_ioregs, &mx6dq_grp_ioregs);
+		mx6_dram_cfg(&mem_s, &mx6q_1g_mmdc_calib, &h5t04g63afr);
+	}
+
+	udelay(100);
+}
+
+void board_init_f(ulong dummy)
+{
+	ccgr_init();
+
+	/* setup AIPS and disable watchdog */
+	arch_cpu_init();
+
+	gpr_init();
+
+	/* iomux */
+	board_early_init_f();
+
+	/* setup GP timer */
+	timer_init();
+
+	/* UART clocks enabled and gd valid - init serial console */
+	preloader_console_init();
+
+	/* DDR initialization */
+	spl_dram_init();
+}
+
+#define USDHC_PAD_CTRL (PAD_CTL_PUS_47K_UP |			\
+	PAD_CTL_SPEED_LOW | PAD_CTL_DSE_80ohm |			\
+	PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+static struct fsl_esdhc_cfg usdhc_cfg[1] = {
+	{USDHC3_BASE_ADDR},
+};
+
+static iomux_v3_cfg_t const usdhc3_pads[] = {
+	IOMUX_PADS(PAD_SD3_CLK__SD3_CLK    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_CMD__SD3_CMD    | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_DAT0__SD3_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_DAT1__SD3_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_DAT2__SD3_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_DAT3__SD3_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL)),
+	/* SOM MicroSD Card Detect */
+	IOMUX_PADS(PAD_EIM_DA9__GPIO3_IO09  | MUX_PAD_CTRL(NO_PAD_CTRL)),
+};
+
+int board_mmc_getcd(struct mmc *mmc)
+{
+	return 1;
+}
+
+int board_mmc_init(bd_t *bis)
+{
+	SETUP_IOMUX_PADS(usdhc3_pads);
+	usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC3_CLK);
+	return fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
+}
+#endif
+
+#ifdef CONFIG_SPL_LOAD_FIT
+int board_fit_config_name_match(const char *name)
+{
+	if (is_mx6dq() && !strcmp(name, "imx6q-pico"))
+		return 0;
+	else if ((is_mx6dl() || is_mx6solo()) && !strcmp(name, "imx6dl-pico"))
+		return 0;
+
+	return -EINVAL;
+}
+#endif