This configures UART4 for use as the debug_ll UART,
whenever CONFIG_DEBUG_LL is defined.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/arm/boards/stm32mp157c-dk2/lowlevel.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
index b8e5959bef83..7f66cbfa1224 100644
--- a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
+++ b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
@@ -5,6 +5,24 @@
#include <mach/stm32.h>
#include <debug_ll.h>
+#define RCC_MP_APB1ENSETR (STM32_RCC_BASE + 0x0A00)
+#define RCC_MP_AHB4ENSETR (STM32_RCC_BASE + 0x0A28)
+#define GPIOG_BASE 0x50008000
+
+static inline void setup_uart(void)
+{
+ /* UART4 clock enable */
+ setbits_le32(RCC_MP_APB1ENSETR, BIT(16));
+
+ /* GPIOG clock enable */
+ writel(BIT(6), RCC_MP_AHB4ENSETR);
+ /* GPIO configuration for EVAL board => UART4 TX = G11 */
+ writel(0xffbfffff, GPIOG_BASE + 0x00);
+ writel(0x00006000, GPIOG_BASE + 0x24);
+
+ putc_ll('>');
+}
+
extern char __dtb_stm32mp157c_dk2_start[];
ENTRY_FUNCTION(start_stm32mp157c_dk2, r0, r1, r2)
@@ -13,6 +31,9 @@ ENTRY_FUNCTION(start_stm32mp157c_dk2, r0, r1, r2)
arm_cpu_lowlevel_init();
+ if (IS_ENABLED(CONFIG_DEBUG_LL))
+ setup_uart();
+
fdt = __dtb_stm32mp157c_dk2_start + get_runtime_offset();
barebox_arm_entry(STM32_DDR_BASE, SZ_512M, fdt);
--
2.20.1
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