linux-kernel - Re: [PATCH 1/2] tty: serial: 8250

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Date:	Thu, 18 Dec 2014 09:48:31 +0100
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, Jiri Slaby <jslaby@...e.cz>,
	Alan Cox <alan@...ux.intel.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	YH Chen (陳昱豪) <yh.chen@...iatek.com>
Subject: Re: [PATCH 1/2] tty: serial: 8250_mtk: Add earlycon

2014-12-18 9:33 GMT+01:00 Eddie Huang <eddie.huang@...iatek.com>:
> Mediatek UART has highspeed register, but 8250_early.c doesn't
> support this, so add earlycon in 8250_mtk.c
>
> Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> ---
>  drivers/tty/serial/8250/8250_mtk.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
> index de7aae5..65dd569 100644
> --- a/drivers/tty/serial/8250/8250_mtk.c
> +++ b/drivers/tty/serial/8250/8250_mtk.c
> @@ -23,6 +23,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/serial_8250.h>
>  #include <linux/serial_reg.h>
> +#include <linux/console.h>
>
>  #include "8250.h"
>
> @@ -289,6 +290,38 @@ static struct platform_driver mtk8250_platform_driver = {
>  };
>  module_platform_driver(mtk8250_platform_driver);
>
> +#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
> +
> +static void __init mtk8250_serial_putc(struct uart_port *port, int c)
> +{
> +       while ((readl(port->membase + (UART_LSR << 2)) & BOTH_EMPTY) !=
> +               BOTH_EMPTY)
> +               ;

Please delete newline before the semicolon.

> +       writel(c, port->membase + (UART_TX << 2));
> +}
> +
> +static void __init early_mtk8250_write(struct console *console,
> +                                       const char *s, unsigned int count)
> +{
> +       struct earlycon_device *dev = console->data;
> +
> +       uart_console_write(&dev->port, s, count, mtk8250_serial_putc);
> +}
> +
> +static int __init early_mtk8250_setup(struct earlycon_device *device,
> +                                       const char *options)
> +{
> +       if (!device->port.membase)
> +               return -ENODEV;
> +
> +       device->con->write = early_mtk8250_write;
> +
> +       return 0;
> +}
> +
> +EARLYCON_DECLARE(mtk8250, early_mtk8250_setup);
> +OF_EARLYCON_DECLARE(mtk8250, "mediatek,mt6577-uart", early_mtk8250_setup);
> +
>  MODULE_AUTHOR("Matthias Brugger");
>  MODULE_LICENSE("GPL");
>  MODULE_DESCRIPTION("Mediatek 8250 serial port driver");
> --
> 1.8.1.1.dirty
>



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