diff options
| author | Simon Glass <sjg@chromium.org> | 2015-07-02 18:15:54 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 21:06:11 -0600 |
| commit | bf6e702232e3b8c38fe0934c1f0240958eaabed3 (patch) | |
| tree | d87edfd116af4e8bb0b395cb89934420ce1c02f3 | |
| parent | 89ca9351cf85ed0843a1a82d626560e0dadb3fe5 (diff) | |
exynos: Add debug UART support for Samsung S5P serial
Add a debug UART implementation for this serial driver. It does not set up
pinmux automatically - this must be done before calling debug_uart_init().
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | drivers/serial/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/serial/serial_s5p.c | 25 |
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index b5a91b707e..fd126a825f 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -53,6 +53,13 @@ config DEBUG_EFI_CONSOLE U-Boot when running on top of EFI (Extensive Firmware Interface). This is a type of BIOS used by PCs. +config DEBUG_UART_S5P + bool "Samsung S5P" + help + Select this to enable a debug UART using the serial_s5p driver. You + will need to provide parameters to make this work. The driver will + be available until the real driver-model serial is running. + endchoice config DEBUG_UART_BASE diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c index 7abec53f80..4a553a37b8 100644 --- a/drivers/serial/serial_s5p.c +++ b/drivers/serial/serial_s5p.c @@ -200,3 +200,28 @@ U_BOOT_DRIVER(serial_s5p) = { .ops = &s5p_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; + +#ifdef CONFIG_DEBUG_UART_S5P + +#include <debug_uart.h> + +void debug_uart_init(void) +{ + struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE; + + s5p_serial_init(uart); + s5p_serial_baud(uart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); +} + +static inline void _debug_uart_putc(int ch) +{ + struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE; + + while (readl(&uart->ufstat) & TX_FIFO_FULL); + + writeb(ch, &uart->utxh); +} + +DEBUG_UART_FUNCS + +#endif |