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Date: Thu, 12 Jun 2014 16:01:34 +0530 From: Vineet Gupta <Vineet.Gupta1@...opsys.com> To: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, "Mark Rutland" <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.cz>, Paul Bolle <pebolle@...cali.nl> CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>, <Francois.Bedard@...opsys.com>, Vineet Gupta <Vineet.Gupta1@...opsys.com> Subject: [PATCH 4/9] serial/arc: Use generic earlycon infrastructure With this change both earlyprintk and earlycon coexist We switch over to latter in next patch Signed-off-by: Vineet Gupta <vgupta@...opsys.com> --- drivers/tty/serial/Kconfig | 1 + drivers/tty/serial/arc_uart.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index fb57159bad3a..2311443be7dc 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1473,6 +1473,7 @@ config SERIAL_ARC_CONSOLE bool "Console on ARC UART" depends on SERIAL_ARC=y select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON help Enable system Console on ARC UART diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c index a6da10f84293..0c8ba5bb97c7 100644 --- a/drivers/tty/serial/arc_uart.c +++ b/drivers/tty/serial/arc_uart.c @@ -646,6 +646,36 @@ static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev) register_console(&arc_early_serial_console); return 0; } + +static __init void arc_early_serial_write(struct console *con, const char *s, + unsigned int n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, arc_serial_poll_putchar); +} + +static int __init arc_early_console_setup(struct earlycon_device *dev, + const char *opt) +{ + struct uart_port *port = &dev->port; + unsigned int l, h, hw_val; + + if (!dev->port.membase) + return -ENODEV; + + hw_val = port->uartclk / (dev->baud * 4) - 1; + l = hw_val & 0xFF; + h = (hw_val >> 8) & 0xFF; + + UART_SET_BAUDL(port, l); + UART_SET_BAUDH(port, h); + + dev->con->write = arc_early_serial_write; + return 0; +} +EARLYCON_DECLARE(arc_uart, arc_early_console_setup); + #endif /* CONFIG_SERIAL_ARC_CONSOLE */ static int arc_serial_probe(struct platform_device *pdev) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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