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feat(st): add early console in BL2

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Add an early UART console to ease debug before UART is fully configured.
This is done under flag STM32MP_EARLY_CONSOLE in the first STM32MP1
platform function called (bl2_el3_early_platform_setup()). It uses the
parameters defined for crash console: STM32MP_DEBUG_USART* macros.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Id6be62368723a0499e97bbf56fb52c166fcbdfad
This commit is contained in:
Yann Gautier 2021-10-18 10:55:23 +02:00
parent 99026cff47
commit c768b2b22f
4 changed files with 41 additions and 12 deletions
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8
plat/st/common/include/stm32mp_common.h
View file

@ -62,6 +62,14 @@ uintptr_t get_uart_address(uint32_t instance_nb);
/* Setup the UART console */
int stm32mp_uart_console_setup(void);
#if STM32MP_EARLY_CONSOLE
void stm32mp_setup_early_console(void);
#else
static inline void stm32mp_setup_early_console(void)
{
}
#endif
/*
* Platform util functions for the GPIO driver
* @bank: Target GPIO bank ID as per DT bindings

39
plat/st/common/stm32mp_common.c
View file

@ -205,10 +205,27 @@ static void reset_uart(uint32_t reset)
}
#endif
static void set_console(uintptr_t base, uint32_t clk_rate)
{
unsigned int console_flags;
if (console_stm32_register(base, clk_rate,
STM32MP_UART_BAUDRATE, &console) == 0) {
panic();
}
console_flags = CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH |
CONSOLE_FLAG_TRANSLATE_CRLF;
#if !defined(IMAGE_BL2) && defined(DEBUG)
console_flags |= CONSOLE_FLAG_RUNTIME;
#endif
console_set_scope(&console, console_flags);
}
int stm32mp_uart_console_setup(void)
{
struct dt_node_info dt_uart_info;
unsigned int console_flags;
uint32_t clk_rate = 0U;
int result;
uint32_t boot_itf __unused;
@ -249,21 +266,19 @@ int stm32mp_uart_console_setup(void)
clk_rate = clk_get_rate((unsigned long)dt_uart_info.clock);
#endif
if (console_stm32_register(dt_uart_info.base, clk_rate,
STM32MP_UART_BAUDRATE, &console) == 0) {
panic();
}
console_flags = CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH |
CONSOLE_FLAG_TRANSLATE_CRLF;
#if !defined(IMAGE_BL2) && defined(DEBUG)
console_flags |= CONSOLE_FLAG_RUNTIME;
#endif
console_set_scope(&console, console_flags);
set_console(dt_uart_info.base, clk_rate);
return 0;
}
#if STM32MP_EARLY_CONSOLE
void stm32mp_setup_early_console(void)
{
plat_crash_console_init();
set_console(STM32MP_DEBUG_USART_BASE, STM32MP_DEBUG_USART_CLK_FRQ);
}
#endif /* STM32MP_EARLY_CONSOLE */
/*****************************************************************************
* plat_is_smccc_feature_available() - This function checks whether SMCCC
* feature is availabile for platform.

2
plat/st/stm32mp1/bl2_plat_setup.c
View file

@ -139,6 +139,8 @@ void bl2_el3_early_platform_setup(u_register_t arg0,
u_register_t arg2 __unused,
u_register_t arg3 __unused)
{
stm32mp_setup_early_console();
stm32mp_save_boot_ctx_address(arg0);
}

4
plat/st/stm32mp1/platform.mk
View file

@ -9,6 +9,8 @@ ARM_WITH_NEON := yes
BL2_AT_EL3 := 1
USE_COHERENT_MEM := 0
STM32MP_EARLY_CONSOLE ?= 0
# Allow TF-A to concatenate BL2 & BL32 binaries in a single file,
# share DTB file between BL2 and BL32
# If it is set to 0, then FIP is used
@ -157,6 +159,7 @@ $(eval $(call assert_booleans,\
PLAT_XLAT_TABLES_DYNAMIC \
STM32MP_DDR_32BIT_INTERFACE \
STM32MP_DDR_DUAL_AXI_PORT \
STM32MP_EARLY_CONSOLE \
STM32MP_EMMC \
STM32MP_EMMC_BOOT \
STM32MP_RAW_NAND \
@ -183,6 +186,7 @@ $(eval $(call add_defines,\
STM32_TF_VERSION \
STM32MP_DDR_32BIT_INTERFACE \
STM32MP_DDR_DUAL_AXI_PORT \
STM32MP_EARLY_CONSOLE \
STM32MP_EMMC \
STM32MP_EMMC_BOOT \
STM32MP_RAW_NAND \