Subject: [RFC][PATCH 1/2] arm64: add ioread64be and iowrite64be macros

From: [email-masked] (Will Deacon)
Date: Wed, 2 Sep 2015 11:38:17 +0100

On Fri, Aug 28, 2015 at 12:49:47PM +0100, Horia Geant? wrote:
> This will allow device drivers to consistently use io{read,write}XXbe
> macros also for 64-bit accesses.
> 
> Signed-off-by: Alex Porosanu <[email-masked]>
> Signed-off-by: Horia Geant? <[email-masked]>
> ---
>  arch/arm64/include/asm/io.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
> index 44be1e03ed65..9b6e408cfa51 100644
> --- a/arch/arm64/include/asm/io.h
> +++ b/arch/arm64/include/asm/io.h
> @@ -174,13 +174,15 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
>  #define iounmap				__iounmap
>  
>  /*
> - * io{read,write}{16,32}be() macros
> + * io{read,write}{16,32,64}be() macros
>   */
>  #define ioread16be(p)		({ __u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
>  #define ioread32be(p)		({ __u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
> +#define ioread64be(p)		({ __u64 __v = be64_to_cpu((__force __be64)__raw_readq(p)); __iormb(); __v; })
>  
>  #define iowrite16be(v,p)	({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); })
>  #define iowrite32be(v,p)	({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })
> +#define iowrite64be(v,p)	({ __iowmb(); __raw_writeq((__force __u64)cpu_to_be64(v), p); })

This looks like the first instance of this in the tree, so perhaps it's
also worth adding a version to asm-generic/io.h predicated on
CONFIG_64BIT?

Will