linux-kernel - Re: [PATCH V2 05/19] bus: omap_l3_noc: switch over to relaxed variants of readl/writel

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Date:	Thu, 17 Apr 2014 17:56:15 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	<balbi@...com>, Nishanth Menon <nm@...com>
CC:	Tony Lindgren <tony@...mide.com>, Sricharan R <r.sricharan@...com>,
	Sekhar Nori <nsekhar@...com>, Rajendra Nayak <rnayak@...com>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 05/19] bus: omap_l3_noc: switch over to relaxed variants
 of readl/writel

On Thursday 17 April 2014 05:52 PM, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Apr 17, 2014 at 03:49:21PM -0500, Nishanth Menon wrote:
>> Currently we use __raw_readl and writel in this driver, however, there
> 
> __raw_* and *_relaxed variants are the same, just have a look <asm/io.h>
> 
Except the relaxed version can take care of endian conversion if
needed. :-)

> 297 #define readb_relaxed(c) ({ u8  __r = __raw_readb(c); __r; })
> 298 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
> 299                                         __raw_readw(c)); __r; })
> 300 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
> 301                                         __raw_readl(c)); __r; })
> 302 
> 303 #define writeb_relaxed(v,c)     __raw_writeb(v,c)
> 304 #define writew_relaxed(v,c)     __raw_writew((__force u16) cpu_to_le16(v),c)
> 305 #define writel_relaxed(v,c)     __raw_writel((__force u32) cpu_to_le32(v),c)
> 

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