Re: [PATCH RFC 1/2] m68k: io_mm.h - add APNE 100 MBit support

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Michael,

On Sun, Jun 6, 2021 at 7:54 AM Michael Schmitz <schmitzmic@gmail.com> wrote:
> Add code to support 10 Mbit and 100 Mbit mode for APNE driver.
>
> A new ISA type ISA_TYPE_AG100 switches the Amiga ISA inb accessor
> to word access as required by the 100 Mbit cards.

missing "dynamically".

>
> Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
> 100 MBit card support" submitted to netdev 2018/09/16 by Alex
> Kazik <alex@kazik.de>.
>
> Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

Thanks for your patch!

> --- a/arch/m68k/include/asm/io_mm.h
> +++ b/arch/m68k/include/asm/io_mm.h
> @@ -101,6 +101,11 @@
>  #define ISA_TYPE_Q40  (1)
>  #define ISA_TYPE_AG   (2)
>  #define ISA_TYPE_ENEC (3)
> +#define ISA_TYPE_AG100 (4)     /* for 100 MBit APNE card */

As this type may be needed for other cards, perhaps it should be
named after what it really does, i.e. always using 16-bit accesses?
ISA_TYPE_AG16?

> +
> +#if defined(CONFIG_APNE100MBIT)

#ifdef

> +#define MULTI_ISA 1
> +#endif
>
>  #if defined(CONFIG_Q40) && !defined(MULTI_ISA)
>  #define ISA_TYPE ISA_TYPE_Q40
> @@ -135,6 +140,9 @@ static inline u8 __iomem *isa_itb(unsigned long addr)
>  #ifdef CONFIG_Q40
>      case ISA_TYPE_Q40: return (u8 __iomem *)Q40_ISA_IO_B(addr);
>  #endif
> +#if defined(CONFIG_APNE100MBIT)

#ifdef

> +    case ISA_TYPE_AG100: fallthrough;

Fallthrough to what? Oh, to ISA_TYPE_AG.
Please make this clear, and safer, by moving this inside the #ifdef
below (CONFIG_APNE100MBIT depends on CONFIG_AMIGA_PCMCIA).

> +#endif
>  #ifdef CONFIG_AMIGA_PCMCIA
>      case ISA_TYPE_AG: return (u8 __iomem *)AG_ISA_IO_B(addr);
>  #endif

> @@ -212,13 +232,16 @@ static inline u16 __iomem *isa_mtw(unsigned long addr)
>  }
>
>
> -#define isa_inb(port)      in_8(isa_itb(port))

Why move it below? Because its comment does not apply to the below?

>  #define isa_inw(port)      (ISA_SEX ? in_be16(isa_itw(port)) : in_le16(isa_itw(port)))
>  #define isa_inl(port)      (ISA_SEX ? in_be32(isa_itl(port)) : in_le32(isa_itl(port)))
>  #define isa_outb(val,port) out_8(isa_itb(port),(val))
>  #define isa_outw(val,port) (ISA_SEX ? out_be16(isa_itw(port),(val)) : out_le16(isa_itw(port),(val)))
>  #define isa_outl(val,port) (ISA_SEX ? out_be32(isa_itl(port),(val)) : out_le32(isa_itl(port),(val)))
>
> +/* for APNE 100 Mbit cards - hope the APNE 100 case will be eliminated as
> + * dead code if MULTI_ISA is not set */

I don't think this comment is needed.

> +#define isa_inb(port)      ((ISA_TYPE == ISA_TYPE_AG100) ? ((port) & 1 ? isa_inw((port) - 1) & 0xff : isa_inw(port) >> 8) : in_8(isa_itb(port))
> +
>  #define isa_readb(p)       in_8(isa_mtb((unsigned long)(p)))
>  #define isa_readw(p)       \
>         (ISA_SEX ? in_be16(isa_mtw((unsigned long)(p))) \

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds