linux-kernel - Re: [PATCH] pcmcia: Add support P2CCLK bit enabler for TI PC1520

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Date:	Tue, 25 Dec 2007 14:04:19 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nobuhiro Iwamatsu <iwamatsu@...auri.org>
Cc:	linux-pcmcia@...ts.infradead.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pcmcia: Add support P2CCLK bit enabler for TI PC1520

On Tue, 18 Dec 2007 18:57:24 +0900 Nobuhiro Iwamatsu <iwamatsu@...auri.org> wrote:

> There is a device that doesn't work when P2CCLK's bit of TI PC1520 was disable.
> This patch supports P2CCLK bit enabler for TI PC1520.
> 
> ...
>
>  config YENTA_TOSHIBA
>  	default y
>  	bool "Special initialization for Toshiba ToPIC bridges" if EMBEDDED
> diff --git a/drivers/pcmcia/ti113x.h b/drivers/pcmcia/ti113x.h
> index d29657b..ea749e8 100644
> --- a/drivers/pcmcia/ti113x.h
> +++ b/drivers/pcmcia/ti113x.h
> @@ -59,6 +59,7 @@
>  #define  TI122X_SCR_SER_STEP		0xc0000000
>  #define  TI122X_SCR_INTRTIE		0x20000000
>  #define  TIXX21_SCR_TIEALL		0x10000000
> +#define  TI122X_SCR_P2CCLK		0x08000000
>  #define  TI122X_SCR_CBRSVD		0x00400000
>  #define  TI122X_SCR_MRBURSTDN		0x00008000
>  #define  TI122X_SCR_MRBURSTUP		0x00004000
> @@ -822,6 +823,13 @@ static int ti12xx_override(struct yenta_socket *socket)
>  		printk(KERN_INFO "Yenta: Enabling burst memory read transactions\n");
>  		val |= TI122X_SCR_MRBURSTUP;
>  	}
> +
> +#ifdef CONFIG_YENTA_TI_P2CCLK
> +	if ( !(val & TI122X_SCR_P2CCLK)) {
> +		printk(KERN_INFO "Yenta: Clock generated by internal oscillator\n");
> +		val |= TI122X_SCR_P2CCLK;
> +	}
> +#endif
>  	if (val_orig != val)
>  		config_writel(socket, TI113X_SYSTEM_CONTROL, val);

It would be much better if we cold do this without the config option: just
detect the appropriate device and make it work.

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