From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Cernekee Subject: [PATCH V2 5/9] tty: serial: bcm63xx: Enable DT earlycon support Date: Mon, 20 Oct 2014 13:54:04 -0700 Message-ID: <1413838448-29464-6-git-send-email-cernekee@gmail.com> References: <1413838448-29464-1-git-send-email-cernekee@gmail.com> Return-path: In-Reply-To: <1413838448-29464-1-git-send-email-cernekee@gmail.com> Sender: linux-serial-owner@vger.kernel.org To: gregkh@linuxfoundation.org, jslaby@suse.cz, robh@kernel.org, grant.likely@linaro.org Cc: geert@linux-m68k.org, f.fainelli@gmail.com, mbizon@freebox.fr, jogo@openwrt.org, linux-mips@linux-mips.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 --- drivers/tty/serial/Kconfig | 1 + drivers/tty/serial/bcm63xx_uart.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 815b652..fdd851e 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 a70910e..2015284 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 -- 2.1.1