1 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c
new file mode 100644
index 000000000..1ed918ee0
--- /dev/null
+++ b/arch/arm/boards/nxp-imx8mq-evk/lowlevel.c
@@ -0,0 +1,81 @@
+/*
+ * 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; version 2.
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <linux/sizes.h>
+#include <mach/generic.h>
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <mach/imx8-ccm-regs.h>
+#include <mach/iomux-mx8.h>
+#include <mach/imx8-ddrc.h>
+#include <mach/xload.h>
+#include <io.h>
+#include <debug_ll.h>
+#include <asm/cache.h>
+#include <asm/sections.h>
+#include <asm/mmu.h>
+
+#include "ddr.h"
+
+extern char __dtb_imx8mq_evk_start[];
+
+#define UART_PAD_CTRL	MUX_PAD_CTRL(PAD_CTL_DSE_3P3V_45_OHM)
+
+static void setup_uart(void)
+{
+	void __iomem *iomux = IOMEM(MX8MQ_IOMUXC_BASE_ADDR);
+	void __iomem *ccm   = IOMEM(MX8MQ_CCM_BASE_ADDR);
+
+	writel(CCM_CCGR_SETTINGn_NEEDED(0),
+	       ccm + CCM_CCGRn_CLR(CCM_CCGR_UART1));
+	writel(CCM_TARGET_ROOTn_ENABLE | UART1_CLK_ROOT__25M_REF_CLK,
+	       ccm + CCM_TARGET_ROOTn(UART1_CLK_ROOT));
+	writel(CCM_CCGR_SETTINGn_NEEDED(0),
+	       ccm + CCM_CCGRn_SET(CCM_CCGR_UART1));
+
+	imx_setup_pad(iomux, IMX8MQ_PAD_UART1_TXD__UART1_TX | UART_PAD_CTRL);
+
+	imx8_uart_setup_ll();
+
+	putc_ll('>');
+}
+
+static void nxp_imx8mq_evk_sram_setup(void)
+{
+	enum bootsource src = BOOTSOURCE_UNKNOWN;
+	int instance = BOOTSOURCE_INSTANCE_UNKNOWN;
+	int ret = -ENOTSUPP;
+
+	ddr_init();
+
+	imx8_get_boot_source(&src, &instance);
+
+	if (src == BOOTSOURCE_MMC)
+		ret = imx8_esdhc_start_image(instance);
+
+	BUG_ON(ret);
+}
+
+ENTRY_FUNCTION(start_nxp_imx8mq_evk, r0, r1, r2)
+{
+	arm_cpu_lowlevel_init();
+
+	if (IS_ENABLED(CONFIG_DEBUG_LL))
+		setup_uart();
+
+	if (get_pc() < MX8MQ_DDR_CSD1_BASE_ADDR)
+		nxp_imx8mq_evk_sram_setup();
+
+	barebox_arm_entry(MX8MQ_DDR_CSD1_BASE_ADDR,
+			  SZ_2G + SZ_1G, __dtb_imx8mq_evk_start);
+}
+