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Date: Fri, 28 Jun 2013 10:19:34 +0800
From: Chen Gang <gang.chen@...anux.com>
To: Arnd Bergmann <arnd@...db.de>
CC: Geert Uytterhoeven <geert@...ux-m68k.org>,
Hirokazu Takata <takata@...ux-m32r.org>,
linux-m32r@...linux-m32r.org, linux-m32r-ja@...linux-m32r.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] arch: m32r: include: asm: add ioread*_rep() and iowrite*_rep()
On 06/27/2013 04:25 PM, Arnd Bergmann wrote:
> On Thursday 27 June 2013 09:07:29 Geert Uytterhoeven wrote:
>> > On Thu, Jun 27, 2013 at 6:37 AM, Chen Gang <gang.chen@...anux.com> wrote:
>>> > > --- a/arch/m32r/include/asm/io.h
>>> > > +++ b/arch/m32r/include/asm/io.h
>>> > > @@ -169,6 +169,20 @@ static inline void _writel(unsigned long l, unsigned long addr)
>>> > > #define iowrite16 writew
>>> > > #define iowrite32 writel
>>> > >
>>> > > +#define ioread8_rep(p, dst, count) \
>>> > > + insb((unsigned long) (p), (dst), (count))
>> >
>> > As ioread8() is mapped to readb() (I/O memory space), not inb() (I/O
>> > port space),
>> > ioread8_rep() should map to readsb() (which m32r doesn't have yet
>> > BTW), not insb().
>> > For m32r this does matter, as inb() and readb() use different mechanisms
>> > internally.
>> >
>> > It seems include/asm-generic/io.h also has this wrong?
> Yes, you are right. I thought we had fixed that long ago.
>
> Does the patch below look ok to you? Note that none of the architectures
> using asm-generic/io.h supports PIO access and it works by chance
> this way, but we should definitely fix it.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
Is it better to let the code block (from "#ifndef CONFIG_GENERIC_IOMAP
to #endif) in an individual file (e.g. iomap_inline.h)?
So that many architectures (m32r, tile, ...) can include the individual
file to get these necessary code, and not need consider the confilict
about the other code in generic io.h ?
Thanks.
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index d5afe96..8af7a64 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -161,108 +161,108 @@ static inline void outl(u32 b, unsigned long addr)
> #define outw_p(x, addr) outw((x), (addr))
> #define outl_p(x, addr) outl((x), (addr))
>
> -#ifndef insb
> -static inline void insb(unsigned long addr, void *buffer, int count)
> +#ifndef CONFIG_GENERIC_IOMAP
> +#define ioread8(addr) readb(addr)
> +#define ioread16(addr) readw(addr)
> +#define ioread16be(addr) __be16_to_cpu(__raw_readw(addr))
> +#define ioread32(addr) readl(addr)
> +#define ioread32be(addr) __be32_to_cpu(__raw_readl(addr))
> +
> +#define iowrite8(v, addr) writeb((v), (addr))
> +#define iowrite16(v, addr) writew((v), (addr))
> +#define iowrite16be(v, addr) __raw_writew(__cpu_to_be16(v), addr)
> +#define iowrite32(v, addr) writel((v), (addr))
> +#define iowrite32be(v, addr) __raw_writel(__cpu_to_be32(v), addr)
> +
> +static inline void ioread8_rep(void __iomem *addr, void *buffer, int count)
> {
> if (count) {
> u8 *buf = buffer;
> do {
> - u8 x = __raw_readb(addr + PCI_IOBASE);
> + u8 x = __raw_readb(addr);
> *buf++ = x;
> } while (--count);
> }
> }
> -#endif
>
> -#ifndef insw
> -static inline void insw(unsigned long addr, void *buffer, int count)
> +static inline void ioread16_rep(void __iomem *addr, void *buffer, int count)
> {
> if (count) {
> u16 *buf = buffer;
> do {
> - u16 x = __raw_readw(addr + PCI_IOBASE);
> + u16 x = __raw_readw(addr);
> *buf++ = x;
> } while (--count);
> }
> }
> -#endif
>
> -#ifndef insl
> -static inline void insl(unsigned long addr, void *buffer, int count)
> +static inline void ioread32_rep(void __iomem *addr, void *buffer, int count)
> {
> if (count) {
> u32 *buf = buffer;
> do {
> - u32 x = __raw_readl(addr + PCI_IOBASE);
> + u32 x = __raw_readl(addr);
> *buf++ = x;
> } while (--count);
> }
> }
> -#endif
>
> -#ifndef outsb
> -static inline void outsb(unsigned long addr, const void *buffer, int count)
> +static inline void iowrite8_rep(void __iomem *addr, const void *buffer, int count)
> {
> if (count) {
> const u8 *buf = buffer;
> do {
> - __raw_writeb(*buf++, addr + PCI_IOBASE);
> + __raw_writeb(*buf++, addr);
> } while (--count);
> }
> }
> -#endif
>
> -#ifndef outsw
> -static inline void outsw(unsigned long addr, const void *buffer, int count)
> +static inline void iowrite16_rep(void __iomem *addr, const void *buffer, int count)
> {
> if (count) {
> const u16 *buf = buffer;
> do {
> - __raw_writew(*buf++, addr + PCI_IOBASE);
> + __raw_writew(*buf++, addr);
> } while (--count);
> }
> }
> -#endif
>
> -#ifndef outsl
> -static inline void outsl(unsigned long addr, const void *buffer, int count)
> +static inline void iowrite32_rep(void __iomem *addr, const void *buffer, int count)
> {
> if (count) {
> const u32 *buf = buffer;
> do {
> - __raw_writel(*buf++, addr + PCI_IOBASE);
> + __raw_writel(*buf++, addr);
> } while (--count);
> }
> }
> -#endif
> -
> -#ifndef CONFIG_GENERIC_IOMAP
> -#define ioread8(addr) readb(addr)
> -#define ioread16(addr) readw(addr)
> -#define ioread16be(addr) __be16_to_cpu(__raw_readw(addr))
> -#define ioread32(addr) readl(addr)
> -#define ioread32be(addr) __be32_to_cpu(__raw_readl(addr))
> +#endif /* CONFIG_GENERIC_IOMAP */
>
> -#define iowrite8(v, addr) writeb((v), (addr))
> -#define iowrite16(v, addr) writew((v), (addr))
> -#define iowrite16be(v, addr) __raw_writew(__cpu_to_be16(v), addr)
> -#define iowrite32(v, addr) writel((v), (addr))
> -#define iowrite32be(v, addr) __raw_writel(__cpu_to_be32(v), addr)
> +#ifndef insb
> +#define insb(a, dst, count) \
> + ioread8_rep((a) + PCI_IOBASE, (dst), (count))
> +#endif
> +#ifndef insw
> +#define insw(a, dst, count) \
> + ioread16_rep((a) + PCI_IOBASE, (dst), (count))
> +#endif
> +#ifndef insl
> +#define insl(a, dst, count) \
> + ioread32_rep((a) + PCI_IOBASE, (dst), (count))
> +#endif
>
> -#define ioread8_rep(p, dst, count) \
> - insb((unsigned long) (p), (dst), (count))
> -#define ioread16_rep(p, dst, count) \
> - insw((unsigned long) (p), (dst), (count))
> -#define ioread32_rep(p, dst, count) \
> - insl((unsigned long) (p), (dst), (count))
> -
> -#define iowrite8_rep(p, src, count) \
> - outsb((unsigned long) (p), (src), (count))
> -#define iowrite16_rep(p, src, count) \
> - outsw((unsigned long) (p), (src), (count))
> -#define iowrite32_rep(p, src, count) \
> - outsl((unsigned long) (p), (src), (count))
> -#endif /* CONFIG_GENERIC_IOMAP */
> +#ifndef outsb
> +#define outsb(a, src, count) \
> + iowrite8_rep((a) + PCI_IOBASE, (src), (count))
> +#endif
> +#ifndef outsw
> +#define outsw(a, src, count) \
> + iowrite16_rep((a) + PCI_IOBASE, (src), (count))
> +#endif
> +#ifndef outsl
> +#define outsl(a, src, count) \
> + iowrite32_rep((a) + PCI_IOBASE, (src), (count))
> +#endif
>
> #ifndef IO_SPACE_LIMIT
> #define IO_SPACE_LIMIT 0xffff
--
Chen Gang
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