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arm: K3: common: Allow for early console functionality

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Implement an early console functionality in SPL that can be used before
the main console is being brought up. This helps in situations where the
main console is dependent on System Firmware (SYSFW) being up and running,
which is usually not the case during the very early stages of boot. Using
this early console functionality will allow for an alternate serial port
to be used to support things like UART-based boot and early diagnostic
messages until the main console is ready to get activated.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
This commit is contained in:
Andreas Dannenberg 2019-08-15 15:55:28 -05:00 committed by Tom Rini
parent e413033d35
commit e630afe1de
3 changed files with 48 additions and 0 deletions
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21
arch/arm/mach-k3/Kconfig
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@ -66,6 +66,27 @@ config SYS_K3_BOOT_CORE_ID
int
default 16
config K3_EARLY_CONS
bool "Activate to allow for an early console during SPL"
depends on SPL
help
Turn this option on to enable an early console functionality in SPL
before the main console is being brought up. This can be useful in
situations where the main console is dependent on System Firmware
(SYSFW) being up and running, which is usually not the case during
the very early stages of boot. Using this early console functionality
will allow for an alternate serial port to be used to support things
like UART-based boot and early diagnostic messages until the main
console is ready to get activated.
config K3_EARLY_CONS_IDX
depends on K3_EARLY_CONS
int "Index of serial device to use for SPL early console"
default 1
help
Use this option to set the index of the serial device to be used
for the early console during SPL execution.
config K3_LOAD_SYSFW
bool
depends on SPL

26
arch/arm/mach-k3/common.c
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@ -27,6 +27,32 @@ struct ti_sci_handle *get_ti_sci_handle(void)
return (struct ti_sci_handle *)ti_sci_get_handle_from_sysfw(dev);
}
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_K3_EARLY_CONS
int early_console_init(void)
{
struct udevice *dev;
int ret;
gd->baudrate = CONFIG_BAUDRATE;
ret = uclass_get_device_by_seq(UCLASS_SERIAL, CONFIG_K3_EARLY_CONS_IDX,
&dev);
if (ret) {
printf("Error getting serial dev for early console! (%d)\n",
ret);
return ret;
}
gd->cur_serial_dev = dev;
gd->flags |= GD_FLG_SERIAL_READY;
gd->have_console = 1;
return 0;
}
#endif
#ifdef CONFIG_SYS_K3_SPL_ATF
void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
{

1
arch/arm/mach-k3/common.h
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@ -9,3 +9,4 @@
#include <asm/armv7_mpu.h>
void setup_k3_mpu_regions(void);
int early_console_init(void);