From: Kevin Cernekee Date: Tue, 21 Oct 2014 22:23:02 +0000 (-0700) Subject: tty: serial: bcm63xx: Enable DT earlycon support X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=1ab8e4b1acdf39ebe6002bbe07ef6e578cff5d74;p=deliverable%2Flinux.git tty: serial: bcm63xx: Enable DT earlycon support This enables early console output if there is a chosen/stdout-path property referencing a UART node with the "brcm,bcm6345-uart" compatible string. The bootloader sets up the pinmux and baud/parity/etc. Tested on bcm3384 (MIPS, DT). Signed-off-by: Kevin Cernekee Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 5210c9f62302..7088373efc15 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1297,6 +1297,7 @@ config SERIAL_BCM63XX_CONSOLE bool "Console on BCM63xx serial port" depends on SERIAL_BCM63XX=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help If you have enabled the serial port on the BCM63xx CPU you can make it the console by answering Y to this option. diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c index b615af2230aa..109dea711318 100644 --- a/drivers/tty/serial/bcm63xx_uart.c +++ b/drivers/tty/serial/bcm63xx_uart.c @@ -782,6 +782,26 @@ static int __init bcm63xx_console_init(void) console_initcall(bcm63xx_console_init); +static void bcm_early_write(struct console *con, const char *s, unsigned n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, bcm_console_putchar); + wait_for_xmitr(&dev->port); +} + +static int __init bcm_early_console_setup(struct earlycon_device *device, + const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = bcm_early_write; + return 0; +} + +OF_EARLYCON_DECLARE(bcm63xx_uart, "brcm,bcm6345-uart", bcm_early_console_setup); + #define BCM63XX_CONSOLE (&bcm63xx_console) #else #define BCM63XX_CONSOLE NULL