1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arm/boards/sama5d27-giantboard/lowlevel.c b/arch/arm/boards/sama5d27-giantboard/lowlevel.c
new file mode 100644
index 0000000000..0236c424c1
--- /dev/null
+++ b/arch/arm/boards/sama5d27-giantboard/lowlevel.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2019 Ahmad Fatoum, Pengutronix
+ */
+
+#include <common.h>
+#include <init.h>
+
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <mach/at91_pmc_ll.h>
+
+#include <mach/hardware.h>
+#include <mach/iomux.h>
+#include <debug_ll.h>
+#include <mach/at91_dbgu.h>
+
+/* PCK = 492MHz, MCK = 164MHz */
+#define MASTER_CLOCK	164000000
+
+static inline void sama5d2_pmc_enable_periph_clock(int clk)
+{
+	at91_pmc_sam9x5_enable_periph_clock(IOMEM(SAMA5D2_BASE_PMC), clk);
+}
+
+static void dbgu_init(void)
+{
+	unsigned mck = MASTER_CLOCK / 2;
+
+	sama5d2_pmc_enable_periph_clock(SAMA5D2_ID_PIOD);
+
+	at91_mux_pio4_set_A_periph(IOMEM(SAMA5D2_BASE_PIOD),
+				   pin_to_mask(AT91_PIN_PD3)); /* DBGU TXD */
+
+	sama5d2_pmc_enable_periph_clock(SAMA5D2_ID_UART1);
+
+	at91_dbgu_setup_ll(IOMEM(SAMA5D2_BASE_UART1), mck, 115200);
+
+	putc_ll('>');
+}
+
+extern char __dtb_z_at91_sama5d27_giantboard_start[];
+
+static noinline void giantboard_entry(void)
+{
+	void *fdt;
+
+	if (IS_ENABLED(CONFIG_DEBUG_LL))
+		dbgu_init();
+
+	fdt = __dtb_z_at91_sama5d27_giantboard_start + get_runtime_offset();
+
+	barebox_arm_entry(SAMA5_DDRCS, SZ_128M, fdt);
+}
+
+ENTRY_FUNCTION(start_sama5d27_giantboard, r0, r1, r2)
+{
+	arm_cpu_lowlevel_init();
+
+	arm_setup_stack(SAMA5D2_SRAM_BASE + SAMA5D2_SRAM_SIZE);
+
+	giantboard_entry();
+}