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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 will need to provide parameters to make this work. The driver will
be available until the real driver-model serial is running. 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 config DEBUG_UART_MSM_GENI
bool "Qualcomm snapdragon" bool "Qualcomm snapdragon"
depends on ARCH_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, .probe = msm_serial_probe,
.ops = &msm_serial_ops, .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