linux-kernel - Re: [PATCH v2] ARM: supplementing IO accessors with 64 bit capability

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Date:	Thu, 23 Oct 2014 16:53:47 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	mathieu.poirier@...aro.org
cc:	linux@....linux.org.uk, catalin.marinas@....com,
	stefano.stabellini@...citrix.com,
	ezequiel.garcia@...e-electrons.com, Liviu.Dudau@....com,
	thomas.petazzoni@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: supplementing IO accessors with 64 bit
 capability

On Thu, 23 Oct 2014, mathieu.poirier@...aro.org wrote:

> From: Mathieu Poirier <mathieu.poirier@...aro.org>
> 
> Some drivers on ARMv7 need 64 bit read and writes.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>

If you make __LINUX_ARM_ARCH__ >= 6 then you may add

Acked-by: Nicolas Pitre <nico@...aro.org>

> ---
> Changes for v2:
>  - Protecting [readq, writeq]_relaxed with architecture constraint.
> 
>  arch/arm/include/asm/io.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
> index 1805674..027832b 100644
> --- a/arch/arm/include/asm/io.h
> +++ b/arch/arm/include/asm/io.h
> @@ -118,6 +118,24 @@ static inline u32 __raw_readl(const volatile void __iomem *addr)
>  	return val;
>  }
>  
> +#if __LINUX_ARM_ARCH__ >= 5
> +static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
> +{
> +	asm volatile("strd %1, %0"
> +		     : "+Qo" (*(volatile u64 __force *)addr)
> +		     : "r" (val));
> +}
> +
> +static inline u64 __raw_readq(const volatile void __iomem *addr)
> +{
> +	u64 val;
> +	asm volatile("ldrd %1, %0"
> +		     : "+Qo" (*(volatile u64 __force *)addr),
> +		       "=r" (val));
> +	return val;
> +}
> +#endif
> +
>  /*
>   * Architecture ioremap implementation.
>   */
> @@ -306,10 +324,17 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
>  					__raw_readw(c)); __r; })
>  #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
>  					__raw_readl(c)); __r; })
> +#if __LINUX_ARM_ARCH__ >= 5
> +#define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64) \
> +					__raw_readq(c)); __r; })
> +#endif
>  
>  #define writeb_relaxed(v,c)	__raw_writeb(v,c)
>  #define writew_relaxed(v,c)	__raw_writew((__force u16) cpu_to_le16(v),c)
>  #define writel_relaxed(v,c)	__raw_writel((__force u32) cpu_to_le32(v),c)
> +#if __LINUX_ARM_ARCH__ >= 5
> +#define writeq_relaxed(v,c)	__raw_writeq((__force u64) cpu_to_le64(v),c)
> +#endif
>  
>  #define readb(c)		({ u8  __v = readb_relaxed(c); __iormb(); __v; })
>  #define readw(c)		({ u16 __v = readw_relaxed(c); __iormb(); __v; })
> -- 
> 1.9.1
> 
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