linux-kernel - Re: [RFC PATCH 2/2] Alchemy: UART PM through serial framework.

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Date:	Wed, 24 Mar 2010 20:40:17 +0300
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Manuel Lauss <manuel.lauss@...glemail.com>
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, Manuel Lauss <manuel.lauss@...il.com>
Subject: Re: [RFC PATCH 2/2] Alchemy: UART PM through serial framework.

Hello.

Manuel Lauss wrote:

> Hook up the Alchemy on-chip uarts with the platform 8250 PM callback
> and enable/disable the uart blocks as needed.
>
> Tested on Au1200.
>
> Signed-off-by: Manuel Lauss <manuel.lauss@...il.com>
> ---
>  arch/mips/alchemy/common/platform.c |   17 +++++++++++++++++
>  arch/mips/alchemy/common/power.c    |   32 --------------------------------
>  2 files changed, 17 insertions(+), 32 deletions(-)
>
> diff --git a/arch/mips/alchemy/common/platform.c b/arch/mips/alchemy/common/platform.c
> index 2580e77..70f4abd 100644
> --- a/arch/mips/alchemy/common/platform.c
> +++ b/arch/mips/alchemy/common/platform.c
> @@ -21,6 +21,22 @@
>  #include <asm/mach-au1x00/au1100_mmc.h>
>  #include <asm/mach-au1x00/au1xxx_eth.h>
>  
> +static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
> +			    unsigned int old_state)
> +{
> +	if (state == 0) {		/* power on */
> +		__raw_writel(0, port->membase + UART_MOD_CNTRL);
> +		wmb();
> +		__raw_writel(1, port->membase + UART_MOD_CNTRL);
> +		wmb();
> +		__raw_writel(3, port->membase + UART_MOD_CNTRL);
> +		wmb();
> +	} else if (state == 3) {	/* power off */
> +		__raw_writel(0, port->membase + UART_MOD_CNTRL);
> +		wmb();
> +	}
> +}

   A *switch* statement seems more fitting here...

WBR, Sergei

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