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serial: msm: add debug UART

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Introduce support for early debugging. This relies on the previous stage
bootloader to initialise the UART clocks, when running with U-Boot as
the primary bootloader this feature doesn't work. It will require a way
to configure the clocks before the driver model is available.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2024-02-26 17:26:11 +00:00
parent 641237bf99
commit 90023bdfe9
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GPG key ID: 7930459FB9303217
2 changed files with 45 additions and 0 deletions
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8
drivers/serial/Kconfig
View file

@ -319,6 +319,14 @@ config DEBUG_UART_S5P
will need to provide parameters to make this work. The driver will
be available until the real driver-model serial is running.
config DEBUG_UART_MSM
bool "Qualcomm QUP UART debug"
depends on ARCH_SNAPDRAGON
help
Select this to enable a debug UART using the serial_msm driver. You
will need to provide parameters to make this work. The driver will
be available until the real driver-model serial is running.
config DEBUG_UART_MSM_GENI
bool "Qualcomm snapdragon"
depends on ARCH_SNAPDRAGON

37
drivers/serial/serial_msm.c
View file

@ -252,3 +252,40 @@ U_BOOT_DRIVER(serial_msm) = {
.probe = msm_serial_probe,
.ops = &msm_serial_ops,
};
#ifdef CONFIG_DEBUG_UART_MSM
static struct msm_serial_data init_serial_data = {
.base = CONFIG_VAL(DEBUG_UART_BASE),
.clk_rate = 7372800,
};
#include <debug_uart.h>
/* Uncomment to turn on UART clocks when debugging U-Boot as aboot on MSM8916 */
//int apq8016_clk_init_uart(phys_addr_t gcc_base);
static inline void _debug_uart_init(void)
{
/* Uncomment to turn on UART clocks when debugging U-Boot as aboot on MSM8916 */
//apq8016_clk_init_uart(0x1800000);
uart_dm_init(&init_serial_data);
}
static inline void _debug_uart_putc(int ch)
{
struct msm_serial_data *priv = &init_serial_data;
while (!(readl(priv->base + UARTDM_SR) & UARTDM_SR_TX_EMPTY) &&
!(readl(priv->base + UARTDM_ISR) & UARTDM_ISR_TX_READY))
;
writel(UARTDM_CR_CMD_RESET_TX_READY, priv->base + UARTDM_CR);
writel(1, priv->base + UARTDM_NCF_TX);
writel(ch, priv->base + UARTDM_TF);
}
DEBUG_UART_FUNCS
#endif