linux-kernel - Re: [PATCH 4/5] MIPS: ath79: Fix the PCI memory size and offset of window 7

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Date:	Sun, 19 Apr 2015 13:20:07 +0200
From:	Alban <albeu@...e.fr>
To:	Jonas Gorski <jogo@...nwrt.org>
Cc:	Aban Bedel <albeu@...e.fr>,
	MIPS Mailing List <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] MIPS: ath79: Fix the PCI memory size and offset of
 window 7

On Sun, 19 Apr 2015 00:28:39 +0200
Jonas Gorski <jogo@...nwrt.org> wrote:

> Hi,
> 
> On Fri, Apr 17, 2015 at 2:36 PM, Alban Bedel <albeu@...e.fr> wrote:
> > The define AR71XX_PCI_MEM_SIZE miss one window, there is 7 windows,
> > not 6. To make things clearer, and allow simpler code, derive
> > AR71XX_PCI_MEM_SIZE from the newly introduced AR71XX_PCI_WIN_COUNT
> > and AR71XX_PCI_WIN_SIZE.
> >
> > The define AR71XX_PCI_WIN7_OFFS also add a typo, fix it.
> 
> I think this will break PCI on ar71xx.
> 
> >
> > Signed-off-by: Alban Bedel <albeu@...e.fr>
> > ---
> >  arch/mips/include/asm/mach-ath79/ar71xx_regs.h | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
> > b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h index
> > aa3800c..e2669a8 100644 ---
> > a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h +++
> > b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h @@ -41,7 +41,9 @@
> >  #define AR71XX_RESET_SIZE      0x100
> >
> >  #define AR71XX_PCI_MEM_BASE    0x10000000
> > -#define AR71XX_PCI_MEM_SIZE    0x07000000
> > +#define AR71XX_PCI_WIN_COUNT   8
> > +#define AR71XX_PCI_WIN_SIZE    0x01000000
> > +#define AR71XX_PCI_MEM_SIZE    (AR71XX_PCI_WIN_COUNT *
> > AR71XX_PCI_WIN_SIZE)
> >
> >  #define AR71XX_PCI_WIN0_OFFS   0x10000000
> >  #define AR71XX_PCI_WIN1_OFFS   0x11000000
> > @@ -50,7 +52,7 @@
> >  #define AR71XX_PCI_WIN4_OFFS   0x14000000
> >  #define AR71XX_PCI_WIN5_OFFS   0x15000000
> >  #define AR71XX_PCI_WIN6_OFFS   0x16000000
> > -#define AR71XX_PCI_WIN7_OFFS   0x07000000
> > +#define AR71XX_PCI_WIN7_OFFS   0x17000000
> 
> These values are used in exactly one place, for writing into the PCI
> address space offset registers.
> The 7th PCI window is a special one for accessing the configuration
> space registers, which requires to be set to 0x07000000 for that
> purpose. So by changing this value you likely break access to these
> values.

Sorry, I foolishly assumed it was a typo.

> >
> >  #define AR71XX_PCI_CFG_BASE    \
> >         (AR71XX_PCI_MEM_BASE + AR71XX_PCI_WIN7_OFFS + 0x10000)
> 
> Also this macro would now be wrong, and calculate a wrong address.

I see, I'll drop this patch and rework the following one to match the
old code.

Alban

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