linux-kernel - Re: [PATCH] [1/1] CPU-i386-Geode: Chipset access macros do not work as expected (2nd try)

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Message-Id: <200704301540.l3UFeYPV019904@harpo.it.uu.se>
Date:	Mon, 30 Apr 2007 17:40:34 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	juergen127@...uzholzen.de, mikpe@...uu.se
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [1/1] CPU-i386-Geode: Chipset access macros do not work as expected (2nd try)

On Mon, 30 Apr 2007 17:33:41 +0200, Juergen Beisert wrote:
> Replace NSC/Cyrix specific chipset access macros by inlined functions.
> With the macros a line like this fails (and does nothing):
> 	setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
> With inlined functions this line will work as expected.
> 
> Note about a side effect: Seems on Geode GX1 based systems the
> "suspend on halt power saving feature" was never enabled due to this
> wrong macro expansion. With inlined functions it will be enabled, but
> this will stop the TSC when the CPU runs into a HLT instruction.
> Kernel outputs something like this:
> 	Clocksource tsc unstable (delta = -472746897 ns)
> Tested on a Geode GX1 system.
> 
> This is the second version with some modifications suggested by
> Mikael Pettersson
> 
> Signed-off-by: Juergen Beisert <juergen.beisert@...henstephan.org>

Acked-by: Mikael Pettersson <mikpe@...uu.se>

> Index: linux-2.6.21/include/asm-i386/processor.h
> ===================================================================
> --- linux-2.6.21.orig/include/asm-i386/processor.h
> +++ linux-2.6.21/include/asm-i386/processor.h
> @@ -202,37 +202,6 @@ static inline void clear_in_cr4 (unsigne
>  	write_cr4(cr4);
>  }
> 
> -/*
> - *      NSC/Cyrix CPU configuration register indexes
> - */
> -
> -#define CX86_PCR0 0x20
> -#define CX86_GCR  0xb8
> -#define CX86_CCR0 0xc0
> -#define CX86_CCR1 0xc1
> -#define CX86_CCR2 0xc2
> -#define CX86_CCR3 0xc3
> -#define CX86_CCR4 0xe8
> -#define CX86_CCR5 0xe9
> -#define CX86_CCR6 0xea
> -#define CX86_CCR7 0xeb
> -#define CX86_PCR1 0xf0
> -#define CX86_DIR0 0xfe
> -#define CX86_DIR1 0xff
> -#define CX86_ARR_BASE 0xc4
> -#define CX86_RCR_BASE 0xdc
> -
> -/*
> - *      NSC/Cyrix CPU indexed register access macros
> - */
> -
> -#define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
> -
> -#define setCx86(reg, data) do { \
> -	outb((reg), 0x22); \
> -	outb((data), 0x23); \
> -} while (0)
> -
>  /* Stop speculative execution */
>  static inline void sync_core(void)
>  {
> Index: linux-2.6.21/include/asm-i386/processor-cyrix.h
> ===================================================================
> --- /dev/null
> +++ linux-2.6.21/include/asm-i386/processor-cyrix.h
> @@ -0,0 +1,33 @@
> +/*
> + * NSC/Cyrix CPU configuration register indexes
> + */
> +#define CX86_PCR0 0x20
> +#define CX86_GCR  0xb8
> +#define CX86_CCR0 0xc0
> +#define CX86_CCR1 0xc1
> +#define CX86_CCR2 0xc2
> +#define CX86_CCR3 0xc3
> +#define CX86_CCR4 0xe8
> +#define CX86_CCR5 0xe9
> +#define CX86_CCR6 0xea
> +#define CX86_CCR7 0xeb
> +#define CX86_PCR1 0xf0
> +#define CX86_DIR0 0xfe
> +#define CX86_DIR1 0xff
> +#define CX86_ARR_BASE 0xc4
> +#define CX86_RCR_BASE 0xdc
> +
> +/*
> + * NSC/Cyrix CPU indexed register access
> + */
> +static inline u8 getCx86(u8 reg)
> +{
> +	outb(reg, 0x22);
> +	return inb(0x23);
> +}
> +
> +static inline void setCx86(u8 reg, u8 data)
> +{
> +	outb(reg, 0x22);
> +	outb(data, 0x23);
> +}
> Index: linux-2.6.21/arch/i386/kernel/cpu/cyrix.c
> ===================================================================
> --- linux-2.6.21.orig/arch/i386/kernel/cpu/cyrix.c
> +++ linux-2.6.21/arch/i386/kernel/cpu/cyrix.c
> @@ -4,7 +4,7 @@
>  #include <linux/pci.h>
>  #include <asm/dma.h>
>  #include <asm/io.h>
> -#include <asm/processor.h>
> +#include <asm/processor-cyrix.h>
>  #include <asm/timer.h>
>  #include <asm/pci-direct.h>
> 
> Index: linux-2.6.21/arch/i386/kernel/cpu/mtrr/cyrix.c
> ===================================================================
> --- linux-2.6.21.orig/arch/i386/kernel/cpu/mtrr/cyrix.c
> +++ linux-2.6.21/arch/i386/kernel/cpu/mtrr/cyrix.c
> @@ -3,6 +3,7 @@
>  #include <asm/mtrr.h>
>  #include <asm/msr.h>
>  #include <asm/io.h>
> +#include <asm/processor-cyrix.h>
>  #include "mtrr.h"
> 
>  int arr3_protected;
> 
-
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