linux-kernel - Re: [PATCH] serial: cadence: Add generic earlycon support

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Message-ID: <5419905A.6030701@monstr.eu>
Date:	Wed, 17 Sep 2014 15:44:58 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Randy Dunlap <rdunlap@...radead.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] serial: cadence: Add generic earlycon support

Hi Greg,

On 09/10/2014 12:43 PM, Michal Simek wrote:
> Add earlycon support for the cadence serial port.
> This is based on recent patches:
> "tty/serial: pl011: add generic earlycon support"
> (sha1: 0d3c673e7881e691991b2a4745bd4f149603baa2)
> "tty/serial: add arm/arm64 semihosting earlycon"
> (sha1: d50d7269ebcb438afa346cdffce0f4e2a1b9e831)
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
>  Documentation/kernel-parameters.txt |  6 ++++++
>  drivers/tty/serial/Kconfig          |  1 +
>  drivers/tty/serial/xilinx_uartps.c  | 19 +++++++++++++++++++
>  3 files changed, 26 insertions(+)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index a8eb6afce6a4..97055dc43167 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -921,6 +921,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> 
>  	earlycon=	[KNL] Output early console device and options.
> 
> +		cdns,<addr>
> +			Start an early, polled-mode console on a cadence serial
> +			port at the specified address. The cadence serial port
> +			must already be setup and configured. Options are not
> +			yet supported.
> +
>  		uart[8250],io,<addr>[,options]
>  		uart[8250],mmio,<addr>[,options]
>  		uart[8250],mmio32,<addr>[,options]
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index b4d61e6bf28c..72fd2b6e2241 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1411,6 +1411,7 @@ config SERIAL_XILINX_PS_UART_CONSOLE
>  	bool "Cadence UART console support"
>  	depends on SERIAL_XILINX_PS_UART=y
>  	select SERIAL_CORE_CONSOLE
> +	select SERIAL_EARLYCON
>  	help
>  	  Enable a Cadence UART port to be the system console.
> 
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 01951d27cc03..675f3fe068f6 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1051,6 +1051,25 @@ static void cdns_uart_console_putchar(struct uart_port *port, int ch)
>  	cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET);
>  }
> 
> +static void cdns_early_write(struct console *con, const char *s, unsigned n)
> +{
> +	struct earlycon_device *dev = con->data;
> +
> +	uart_console_write(&dev->port, s, n, cdns_uart_console_putchar);
> +}
> +
> +static int __init cdns_early_console_setup(struct earlycon_device *device,
> +					   const char *opt)
> +{
> +	if (!device->port.membase)
> +		return -ENODEV;
> +
> +	device->con->write = cdns_early_write;
> +
> +	return 0;
> +}
> +EARLYCON_DECLARE(cdns, cdns_early_console_setup);
> +
>  /**
>   * cdns_uart_console_write - perform write operation
>   * @co: Console handle
> --
> 1.8.2.3
> 

Any problem with this patch?

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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