linux-kernel - Re: [RFC 16/23] ASoC: omap: mcbsp, mcpdm, dmic: raw read and write endian fix

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Date:	Mon, 18 Nov 2013 12:30:42 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	<linux-omap@...r.kernel.org>
CC:	<linaro-networking@...aro.org>,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Jarkko Nikula <jarkko.nikula@...mer.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 16/23] ASoC: omap: mcbsp, mcpdm, dmic: raw read and write
 endian fix

On 11/16/2013 02:01 AM, Taras Kondratiuk wrote:
> From: Victor Kamensky <victor.kamensky@...aro.org>
> 
> All OMAP IP blocks expect LE data, but CPU may operate in BE mode.
> Need to use endian neutral functions to read/write h/w registers.
> I.e instead of __raw_read[lw] and __raw_write[lw] functions code
> need to use read[lw]_relaxed and write[lw]_relaxed functions.
> If the first simply reads/writes register, the second will byteswap
> it if host operates in BE mode.
> 
> Changes are trivial sed like replacement of __raw_xxx functions
> with xxx_relaxed variant.
> 
> Signed-off-by: Victor Kamensky <victor.kamensky@...aro.org>
> Signed-off-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>

Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

> ---
>  sound/soc/omap/mcbsp.c      |   12 ++++++------
>  sound/soc/omap/omap-dmic.c  |    4 ++--
>  sound/soc/omap/omap-mcpdm.c |    4 ++--
>  3 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/sound/soc/omap/mcbsp.c b/sound/soc/omap/mcbsp.c
> index 83433fd..86c7538 100644
> --- a/sound/soc/omap/mcbsp.c
> +++ b/sound/soc/omap/mcbsp.c
> @@ -36,10 +36,10 @@ static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
>  
>  	if (mcbsp->pdata->reg_size == 2) {
>  		((u16 *)mcbsp->reg_cache)[reg] = (u16)val;
> -		__raw_writew((u16)val, addr);
> +		writew_relaxed((u16)val, addr);
>  	} else {
>  		((u32 *)mcbsp->reg_cache)[reg] = val;
> -		__raw_writel(val, addr);
> +		writel_relaxed(val, addr);
>  	}
>  }
>  
> @@ -48,22 +48,22 @@ static int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
>  	void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
>  
>  	if (mcbsp->pdata->reg_size == 2) {
> -		return !from_cache ? __raw_readw(addr) :
> +		return !from_cache ? readw_relaxed(addr) :
>  				     ((u16 *)mcbsp->reg_cache)[reg];
>  	} else {
> -		return !from_cache ? __raw_readl(addr) :
> +		return !from_cache ? readl_relaxed(addr) :
>  				     ((u32 *)mcbsp->reg_cache)[reg];
>  	}
>  }
>  
>  static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
>  {
> -	__raw_writel(val, mcbsp->st_data->io_base_st + reg);
> +	writel_relaxed(val, mcbsp->st_data->io_base_st + reg);
>  }
>  
>  static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
>  {
> -	return __raw_readl(mcbsp->st_data->io_base_st + reg);
> +	return readl_relaxed(mcbsp->st_data->io_base_st + reg);
>  }
>  
>  #define MCBSP_READ(mcbsp, reg) \
> diff --git a/sound/soc/omap/omap-dmic.c b/sound/soc/omap/omap-dmic.c
> index 12e566b..1bd531d 100644
> --- a/sound/soc/omap/omap-dmic.c
> +++ b/sound/soc/omap/omap-dmic.c
> @@ -61,12 +61,12 @@ struct omap_dmic {
>  
>  static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
>  {
> -	__raw_writel(val, dmic->io_base + reg);
> +	writel_relaxed(val, dmic->io_base + reg);
>  }
>  
>  static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
>  {
> -	return __raw_readl(dmic->io_base + reg);
> +	return readl_relaxed(dmic->io_base + reg);
>  }
>  
>  static inline void omap_dmic_start(struct omap_dmic *dmic)
> diff --git a/sound/soc/omap/omap-mcpdm.c b/sound/soc/omap/omap-mcpdm.c
> index 90d2a7c..653ba1c 100644
> --- a/sound/soc/omap/omap-mcpdm.c
> +++ b/sound/soc/omap/omap-mcpdm.c
> @@ -74,12 +74,12 @@ struct omap_mcpdm {
>  
>  static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
>  {
> -	__raw_writel(val, mcpdm->io_base + reg);
> +	writel_relaxed(val, mcpdm->io_base + reg);
>  }
>  
>  static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
>  {
> -	return __raw_readl(mcpdm->io_base + reg);
> +	return readl_relaxed(mcpdm->io_base + reg);
>  }
>  
>  #ifdef DEBUG
> 


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