When there is not device tree file available to U-Boot, we panic. Implement board_pre_console_putc() so that this panic will be displayed on the serial console.
Signed-off-by: Simon Glass sjg@chromium.org --- arch/arm/cpu/armv7/tegra2/board.c | 58 +++++++++++++++++++++++++++++++++++++ 1 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/tegra2/board.c b/arch/arm/cpu/armv7/tegra2/board.c index 349d50e..4ca1e1f 100644 --- a/arch/arm/cpu/armv7/tegra2/board.c +++ b/arch/arm/cpu/armv7/tegra2/board.c @@ -23,9 +23,11 @@
#include <common.h> #include <asm/io.h> +#include <ns16550.h> #include "ap20.h" #include <asm/arch/clock.h> #include <asm/arch/funcmux.h> +#include <asm/arch/gpio.h> #include <asm/arch/sys_proto.h> #include <asm/arch/tegra2.h> #include <asm/arch/pmc.h> @@ -37,6 +39,7 @@ enum { UARTA = 1 << 0, UARTB = 1 << 1, UARTD = 1 << 3, + UART_ALL = 0xf, UART_COUNT = 4, };
@@ -149,3 +152,58 @@ void enable_caches(void) dcache_enable(); } #endif + + +/* + * Possible UART locations: we ignore UARTC at 0x70006200 and UARTE at + * 0x70006400, since we don't have code to init them + */ +static u32 uart_reg_addr[] = { + NV_PA_APB_UARTA_BASE, + NV_PA_APB_UARTB_BASE, + NV_PA_APB_UARTD_BASE, + 0 +}; + +#ifdef CONFIG_PRE_CONSOLE_PUTC +/* + * This is called when we have no console. About the only reason that this + * happen is if we don't have a valid fdt. So we don't know what kind of + * Tegra board we are. We blindly try to print a message every which way we + * know. + */ +void board_pre_console_putc(int ch) +{ + int uart_ids = UART_ALL; /* turn it all on! */ + u32 *uart_addr; + int clock_freq, multiplier, baudrate, divisor; + + /* Try to enable all possible UARTs */ + setup_uarts(uart_ids); + + /* + * Seaboard has a UART switch on PI3. We might be a Seaboard, + * so flip it! + */ +#ifdef CONFIG_SPI_UART_SWITCH + gpio_direction_output(GPIO_PI3, 0); +#endif + + /* + * Now send the string out all the Tegra UARTs. We don't try all + * possible configurations, but this could be added if required. + */ + clock_freq = CONFIG_DEFAULT_NS16550_CLK; + multiplier = CONFIG_DEFAULT_NS16550_MULT; + baudrate = CONFIG_BAUDRATE; + divisor = (clock_freq + (baudrate * (multiplier / 2))) / + (multiplier * baudrate); + + for (uart_addr = uart_reg_addr; *uart_addr; uart_addr++) { + NS16550_init((NS16550_t)*uart_addr, divisor); + NS16550_putc((NS16550_t)*uart_addr, ch); + if (ch == '\n') + NS16550_putc((NS16550_t)*uart_addr, '\r'); + } +} +#endif