imx: imx6ul: Add support for Kontron Electronics SL/BL i.MX6UL/ULL boards (N63xx/N64xx)

This adds support for i.MX6UL/ULL-based evaluation kits with SoMs by
Kontron Electronics GmbH.

Currently there are the following SoM flavors (SoM-Line):
  * N6310: SOM with i.MX6UL-2, 256MB RAM, 256MB SPI NAND
  * N6311: SOM with i.MX6UL-2, 512MB RAM, 512MB SPI NAND
  * N6411: SOM with i.MX6ULL, 512MB RAM, 512MB SPI NAND

And the according evaluation boards (Board-Line):
  * N6310-S: Baseboard with SOM N6310, eMMC, display (optional), ...
  * N6311-S: Baseboard with SOM N6311, eMMC, display (optional), ...
  * N6411-S: Baseboard with SOM N6411, eMMC, display (optional), ...

Currently U-Boot describes i.MX6UL and i.MX6ULL through separate config
options at compile-time. Though the differences are so minor, that for
the scope of these SoMs we just use a single defconfig that is compatible
with both SoCs.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>

5 files changed, 494 insertions, 0 deletions

diff --git a/board/kontron/sl-mx6ul/Kconfig b/board/kontron/sl-mx6ul/Kconfig
new file mode 100644
index 0000000..4e58de2
--- /dev/null
+++ b/board/kontron/sl-mx6ul/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_KONTRON_MX6UL
+
+config SYS_BOARD
+	string
+	default "sl-mx6ul"
+
+config SYS_VENDOR
+	string
+	default "kontron"
+
+config SYS_CONFIG_NAME
+	string
+	default "kontron-sl-mx6ul"
+
+endif
diff --git a/board/kontron/sl-mx6ul/MAINTAINERS b/board/kontron/sl-mx6ul/MAINTAINERS
new file mode 100644
index 0000000..0f8b551
--- /dev/null
+++ b/board/kontron/sl-mx6ul/MAINTAINERS
@@ -0,0 +1,9 @@
+Kontron SL/BL i.MX6UL/ULL Boards (N63xx/N64xx)
+M:	Frieder Schrempf <frieder.schrempf@kontron.de>
+S:	Maintained
+F:	arch/arm/dts/imx6ul-kontron-n6*
+F:	arch/arm/dts/imx6ull-kontron-n6*
+F:	board/kontron/sl-mx6ul
+F:	configs/kontron-sl-mx6ul_defconfig
+F:	doc/board/kontron/sl-mx6ul.rst
+F:	include/configs/kontron-sl-mx6ul.h
diff --git a/board/kontron/sl-mx6ul/Makefile b/board/kontron/sl-mx6ul/Makefile
new file mode 100644
index 0000000..cae273c
--- /dev/null
+++ b/board/kontron/sl-mx6ul/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
+# (C) Copyright 2018 Kontron Electronics GmbH
+
+ifdef CONFIG_SPL_BUILD
+obj-y := spl.o
+else
+obj-y := sl-mx6ul.o
+endif
diff --git a/board/kontron/sl-mx6ul/sl-mx6ul.c b/board/kontron/sl-mx6ul/sl-mx6ul.c
new file mode 100644
index 0000000..79d4d87
--- /dev/null
+++ b/board/kontron/sl-mx6ul/sl-mx6ul.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Kontron Electronics GmbH
+ */
+
+#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/global_data.h>
+#include <fdt_support.h>
+#include <phy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	gd->ram_size = imx_ddr_size();
+
+	return 0;
+}
+
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+	/*
+	 * Overwrite the memory size in the devicetree that is
+	 * passed to the kernel with the actual size detected.
+	 */
+	return fdt_fixup_memory(blob, PHYS_SDRAM, gd->ram_size);
+}
+
+static int setup_fec(void)
+{
+	struct iomuxc *const iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
+	int ret;
+
+	/*
+	 * Use 50M anatop loopback REF_CLK1 for ENET1,
+	 * clear gpr1[13], set gpr1[17].
+	 */
+	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC1_MASK,
+			IOMUX_GPR1_FEC1_CLOCK_MUX1_SEL_MASK);
+
+	/*
+	 * Use 50M anatop loopback REF_CLK2 for ENET2,
+	 * clear gpr1[14], set gpr1[18].
+	 */
+	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC2_MASK,
+			IOMUX_GPR1_FEC2_CLOCK_MUX1_SEL_MASK);
+
+	ret = enable_fec_anatop_clock(0, ENET_50MHZ);
+	if (ret)
+		return ret;
+
+	ret = enable_fec_anatop_clock(1, ENET_50MHZ);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int board_phy_config(struct phy_device *phydev)
+{
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1f, 0x8190);
+
+	if (phydev->drv->config)
+		phydev->drv->config(phydev);
+
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	enable_qspi_clk(0);
+
+	return 0;
+}
+
+int board_init(void)
+{
+	/* Address of boot parameters */
+	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
+
+	setup_fec();
+
+	return 0;
+}
diff --git a/board/kontron/sl-mx6ul/spl.c b/board/kontron/sl-mx6ul/spl.c
new file mode 100644
index 0000000..12b0352
--- /dev/null
+++ b/board/kontron/sl-mx6ul/spl.c
@@ -0,0 +1,377 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Kontron Electronics GmbH
+ */
+
+#include <asm/arch/clock.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/arch/mx6-pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/global_data.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <fsl_esdhc_imx.h>
+#include <init.h>
+#include <linux/delay.h>
+#include <linux/sizes.h>
+#include <linux/errno.h>
+#include <mmc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+	BOARD_TYPE_KTN_N631X = 1,
+	BOARD_TYPE_KTN_N641X,
+	BOARD_TYPE_MAX
+};
+
+#define UART_PAD_CTRL  (PAD_CTL_PKE | PAD_CTL_PUE |		\
+	PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED |		\
+	PAD_CTL_DSE_40ohm   | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+#define USDHC_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE |		\
+	PAD_CTL_PUS_22K_UP  | PAD_CTL_SPEED_LOW |		\
+	PAD_CTL_DSE_80ohm   | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+#define USDHC_CD_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE |	\
+	PAD_CTL_PUS_100K_DOWN  | PAD_CTL_SPEED_LOW |		\
+	PAD_CTL_DSE_80ohm   | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+#define SPI_PAD_CTRL (PAD_CTL_HYS | PAD_CTL_SPEED_MED | \
+	PAD_CTL_DSE_40ohm | PAD_CTL_SRE_FAST)
+
+#include <spl.h>
+#include <asm/arch/mx6-ddr.h>
+
+static iomux_v3_cfg_t const usdhc1_pads[] = {
+	MX6_PAD_SD1_CLK__USDHC1_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_CMD__USDHC1_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA0__USDHC1_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA1__USDHC1_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA2__USDHC1_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA3__USDHC1_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+
+	/* CD */
+	MX6_PAD_UART1_RTS_B__GPIO1_IO19 | MUX_PAD_CTRL(USDHC_CD_PAD_CTRL),
+};
+
+#define USDHC1_CD_GPIO	IMX_GPIO_NR(1, 19)
+
+static iomux_v3_cfg_t const usdhc2_pads[] = {
+	MX6_PAD_NAND_RE_B__USDHC2_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_WE_B__USDHC2_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA00__USDHC2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA01__USDHC2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA02__USDHC2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA03__USDHC2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	/* RST */
+	MX6_PAD_NAND_ALE__GPIO4_IO10 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+#define USDHC2_PWR_GPIO	IMX_GPIO_NR(4, 10)
+
+static struct fsl_esdhc_cfg usdhc_cfg[2] = {
+	{USDHC1_BASE_ADDR, 0, 4},
+	{USDHC2_BASE_ADDR, 0, 4},
+};
+
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
+	int ret = 0;
+
+	switch (cfg->esdhc_base) {
+	case USDHC1_BASE_ADDR:
+		ret = !gpio_get_value(USDHC1_CD_GPIO);
+		break;
+	case USDHC2_BASE_ADDR:
+		// This SDHC interface does not use a CD pin
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
+int board_mmc_init(struct bd_info *bis)
+{
+	int i, ret;
+
+	/*
+	 * According to the board_mmc_init() the following map is done:
+	 * (U-boot device node)    (Physical Port)
+	 * mmc0                    USDHC1
+	 * mmc1                    USDHC2
+	 */
+	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
+		switch (i) {
+		case 0:
+			imx_iomux_v3_setup_multiple_pads(usdhc1_pads, ARRAY_SIZE(usdhc1_pads));
+			gpio_direction_input(USDHC1_CD_GPIO);
+			usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+			break;
+		case 1:
+			imx_iomux_v3_setup_multiple_pads(usdhc2_pads, ARRAY_SIZE(usdhc2_pads));
+			gpio_direction_output(USDHC2_PWR_GPIO, 0);
+			udelay(500);
+			gpio_direction_output(USDHC2_PWR_GPIO, 1);
+			usdhc_cfg[1].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
+			break;
+		default:
+			printf("Warning: you configured more USDHC controllers (%d) than supported by the board\n",
+			       i + 1);
+			return -EINVAL;
+			}
+
+			ret = fsl_esdhc_initialize(bis, &usdhc_cfg[i]);
+			if (ret) {
+				printf("Warning: failed to initialize mmc dev %d\n", i);
+				return ret;
+			}
+	}
+	return 0;
+}
+
+iomux_v3_cfg_t const ecspi2_pads[] = {
+	MX6_PAD_CSI_DATA00__ECSPI2_SCLK | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_CSI_DATA02__ECSPI2_MOSI | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_CSI_DATA03__ECSPI2_MISO | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_CSI_DATA01__GPIO4_IO22  | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+int board_spi_cs_gpio(unsigned int bus, unsigned int cs)
+{
+	return (bus == CONFIG_SF_DEFAULT_BUS && cs == CONFIG_SF_DEFAULT_CS)
+		? (IMX_GPIO_NR(4, 22)) : -1;
+}
+
+static void setup_spi(void)
+{
+	gpio_request(IMX_GPIO_NR(4, 22), "spi2_cs0");
+	gpio_direction_output(IMX_GPIO_NR(4, 22), 1);
+	imx_iomux_v3_setup_multiple_pads(ecspi2_pads, ARRAY_SIZE(ecspi2_pads));
+
+	enable_spi_clk(true, 1);
+}
+
+static iomux_v3_cfg_t const uart4_pads[] = {
+	MX6_PAD_UART4_TX_DATA__UART4_DCE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_UART4_RX_DATA__UART4_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+};
+
+static void setup_iomux_uart(void)
+{
+	imx_iomux_v3_setup_multiple_pads(uart4_pads, ARRAY_SIZE(uart4_pads));
+}
+
+// DDR 256MB (Hynix H5TQ2G63DFR)
+static struct mx6_ddr3_cfg mem_256M_ddr = {
+	.mem_speed = 800,
+	.density = 2,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1350,
+	.trcmin = 4950,
+	.trasmin = 3600,
+};
+
+static struct mx6_mmdc_calibration mx6_mmcd_256M_calib = {
+	.p0_mpwldectrl0 = 0x00000000,
+	.p0_mpdgctrl0 = 0x01340134,
+	.p0_mprddlctl = 0x40405052,
+	.p0_mpwrdlctl = 0x40404E48,
+};
+
+// DDR 512MB (Hynix H5TQ4G63DFR)
+static struct mx6_ddr3_cfg mem_512M_ddr = {
+	.mem_speed = 800,
+	.density = 4,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 15,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1350,
+	.trcmin = 4950,
+	.trasmin = 3600,
+};
+
+static struct mx6_mmdc_calibration mx6_mmcd_512M_calib = {
+	.p0_mpwldectrl0 = 0x00000000,
+	.p0_mpdgctrl0 = 0X01440144,
+	.p0_mprddlctl = 0x40405454,
+	.p0_mpwrdlctl = 0x40404E4C,
+};
+
+// Common DDR parameters (256MB and 512MB)
+static struct mx6ul_iomux_grp_regs mx6_grp_ioregs = {
+	.grp_addds = 0x00000028,
+	.grp_ddrmode_ctl = 0x00020000,
+	.grp_b0ds = 0x00000028,
+	.grp_ctlds = 0x00000028,
+	.grp_b1ds = 0x00000028,
+	.grp_ddrpke = 0x00000000,
+	.grp_ddrmode = 0x00020000,
+	.grp_ddr_type = 0x000c0000,
+};
+
+static struct mx6ul_iomux_ddr_regs mx6_ddr_ioregs = {
+	.dram_dqm0 = 0x00000028,
+	.dram_dqm1 = 0x00000028,
+	.dram_ras = 0x00000028,
+	.dram_cas = 0x00000028,
+	.dram_odt0 = 0x00000028,
+	.dram_odt1 = 0x00000028,
+	.dram_sdba2 = 0x00000000,
+	.dram_sdclk_0 = 0x00000028,
+	.dram_sdqs0 = 0x00000028,
+	.dram_sdqs1 = 0x00000028,
+	.dram_reset = 0x00000028,
+};
+
+struct mx6_ddr_sysinfo ddr_sysinfo = {
+	.dsize = 0,
+	.cs_density = 20,
+	.ncs = 1,
+	.cs1_mirror = 0,
+	.rtt_wr = 2,
+	.rtt_nom = 1,		/* RTT_Nom = RZQ/2 */
+	.walat = 1,		/* Write additional latency */
+	.ralat = 5,		/* Read additional latency */
+	.mif3_mode = 3,		/* Command prediction working mode */
+	.bi_on = 1,		/* Bank interleaving enabled */
+	.sde_to_rst = 0x10,	/* 14 cycles, 200us (JEDEC default) */
+	.rst_to_cke = 0x23,	/* 33 cycles, 500us (JEDEC default) */
+	.ddr_type = DDR_TYPE_DDR3,
+	.refsel = 0,	/* Refresh cycles at 64KHz */
+	.refr = 1,	/* 2 refresh commands per refresh cycle */
+};
+
+static void ccgr_init(void)
+{
+	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	writel(0xFFFFFFFF, &ccm->CCGR0);
+	writel(0xFFFFFFFF, &ccm->CCGR1);
+	writel(0xFFFFFFFF, &ccm->CCGR2);
+	writel(0xFFFFFFFF, &ccm->CCGR3);
+	writel(0xFFFFFFFF, &ccm->CCGR4);
+	writel(0xFFFFFFFF, &ccm->CCGR5);
+	writel(0xFFFFFFFF, &ccm->CCGR6);
+	writel(0xFFFFFFFF, &ccm->CCGR7);
+}
+
+static void spl_dram_init(void)
+{
+	unsigned int size;
+
+	// DDR RAM connection is always 16 bit wide. Init IOs.
+	mx6ul_dram_iocfg(16, &mx6_ddr_ioregs, &mx6_grp_ioregs);
+
+	// Try to detect the 512MB RAM chip first.
+	mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_512M_calib, &mem_512M_ddr);
+
+	// Get the available RAM size
+	size = get_ram_size((void *)PHYS_SDRAM, SZ_512M);
+
+	gd->ram_size = size;
+
+	if (size == SZ_512M) {
+		// 512MB RAM was detected
+		return;
+	} else if (size == SZ_256M) {
+		// 256MB RAM was detected, use correct config and calibration
+		mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_256M_calib, &mem_256M_ddr);
+	} else {
+		printf("Invalid DDR RAM size detected: %x\n", size);
+	}
+}
+
+static int do_board_detect(void)
+{
+	if (is_mx6ul())
+		gd->board_type = BOARD_TYPE_KTN_N631X;
+	else if (is_mx6ull())
+		gd->board_type = BOARD_TYPE_KTN_N641X;
+
+	printf("Kontron SL i.MX6UL%s (N6%s1x) module, %lu MB RAM detected\n",
+	       is_mx6ull() ? "L" : "", is_mx6ull() ? "4" : "3", gd->ram_size / SZ_1M);
+
+	return 0;
+}
+
+void board_init_f(ulong dummy)
+{
+	ccgr_init();
+
+	/* setup AIPS and disable watchdog */
+	arch_cpu_init();
+
+	/* iomux and setup of UART and SPI */
+	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();
+
+	/* Clear the BSS. */
+	memset(__bss_start, 0, __bss_end - __bss_start);
+
+	/* Detect the board type */
+	do_board_detect();
+
+	/* load/boot image from boot device */
+	board_init_r(NULL, 0);
+}
+
+void board_boot_order(u32 *spl_boot_list)
+{
+	u32 bootdev = spl_boot_device();
+
+	/*
+	 * The default boot fuse settings use the SD card (MMC1) as primary
+	 * boot device, but allow SPI NOR as a fallback boot device.
+	 * We can't detect the fallback case and spl_boot_device() will return
+	 * BOOT_DEVICE_MMC1 despite the actual boot device being SPI NOR.
+	 * Therefore we try to load U-Boot proper vom SPI NOR after loading
+	 * from MMC has failed.
+	 */
+	spl_boot_list[0] = bootdev;
+
+	switch (bootdev) {
+	case BOOT_DEVICE_MMC1:
+	case BOOT_DEVICE_MMC2:
+		spl_boot_list[1] = BOOT_DEVICE_SPI;
+		break;
+	}
+}
+
+int board_early_init_f(void)
+{
+	setup_iomux_uart();
+	setup_spi();
+
+	return 0;
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	if (gd->board_type == BOARD_TYPE_KTN_N631X && is_mx6ul() &&
+	    !strcmp(name, "imx6ul-kontron-n631x-s"))
+		return 0;
+
+	if (gd->board_type == BOARD_TYPE_KTN_N641X && is_mx6ull() &&
+	    !strcmp(name, "imx6ull-kontron-n641x-s"))
+		return 0;
+
+	return -1;
+}