linux-kernel - Re: [PATCH 09/16] ARM: ks8695: convert PCI to use generic config accesses

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Date:	Mon, 12 Jan 2015 22:38:04 +1000
From:	Greg Ungerer <gerg@...inux.org>
To:	Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org
CC:	Arnd Bergmann <arnd@...db.de>, linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 09/16] ARM: ks8695: convert PCI to use generic config
 accesses

Hi Rob,

On 10/01/15 12:34, Rob Herring wrote:
> Convert the ks8695 PCI driver to use the generic config access functions.
>
> This changes accesses from __raw_readX/__raw_writeX to readX/writeX
> variants.
>
> Signed-off-by: Rob Herring <robh@...nel.org>
> Cc: Greg Ungerer <gerg@...inux.org>

I wasn't CC'ed on the generic implementation patch ("pci: introduce
common pci config space accessors"), but I assume this is it:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg800405.html

That all looks ok to me. I have not tested it, but:

Acked-by: Greg Ungerer <gerg@...inux.org>

Regards
Greg


> Cc: Russell King <linux@....linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>   arch/arm/mach-ks8695/pci.c | 77 ++++------------------------------------------
>   1 file changed, 6 insertions(+), 71 deletions(-)
>
> diff --git a/arch/arm/mach-ks8695/pci.c b/arch/arm/mach-ks8695/pci.c
> index bb18193..c1bc4c3 100644
> --- a/arch/arm/mach-ks8695/pci.c
> +++ b/arch/arm/mach-ks8695/pci.c
> @@ -38,8 +38,6 @@
>   
>   
>   static int pci_dbg;
> -static int pci_cfg_dbg;
> -
>   
>   static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
>   {
> @@ -59,75 +57,11 @@ static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsi
>   	}
>   }
>   
> -
> -/*
> - * The KS8695 datasheet prohibits anything other than 32bit accesses
> - * to the IO registers, so all our configuration must be done with
> - * 32bit operations, and the correct bit masking and shifting.
> - */
> -
> -static int ks8695_pci_readconfig(struct pci_bus *bus,
> -			unsigned int devfn, int where, int size, u32 *value)
> -{
> -	ks8695_pci_setupconfig(bus->number, devfn, where);
> -
> -	*value = __raw_readl(KS8695_PCI_VA +  KS8695_PBCD);
> -
> -	switch (size) {
> -		case 4:
> -			break;
> -		case 2:
> -			*value = *value >> ((where & 2) * 8);
> -			*value &= 0xffff;
> -			break;
> -		case 1:
> -			*value = *value >> ((where & 3) * 8);
> -			*value &= 0xff;
> -			break;
> -	}
> -
> -	if (pci_cfg_dbg) {
> -		printk("read: %d,%08x,%02x,%d: %08x (%08x)\n",
> -			bus->number, devfn, where, size, *value,
> -			__raw_readl(KS8695_PCI_VA +  KS8695_PBCD));
> -	}
> -
> -	return PCIBIOS_SUCCESSFUL;
> -}
> -
> -static int ks8695_pci_writeconfig(struct pci_bus *bus,
> -			unsigned int devfn, int where, int size, u32 value)
> +static void __iomem *ks8695_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
> +					int where)
>   {
> -	unsigned long tmp;
> -
> -	if (pci_cfg_dbg) {
> -		printk("write: %d,%08x,%02x,%d: %08x\n",
> -			bus->number, devfn, where, size, value);
> -	}
> -
>   	ks8695_pci_setupconfig(bus->number, devfn, where);
> -
> -	switch (size) {
> -		case 4:
> -			__raw_writel(value, KS8695_PCI_VA +  KS8695_PBCD);
> -			break;
> -		case 2:
> -			tmp = __raw_readl(KS8695_PCI_VA +  KS8695_PBCD);
> -			tmp &= ~(0xffff << ((where & 2) * 8));
> -			tmp |= value << ((where & 2) * 8);
> -
> -			__raw_writel(tmp, KS8695_PCI_VA +  KS8695_PBCD);
> -			break;
> -		case 1:
> -			tmp = __raw_readl(KS8695_PCI_VA +  KS8695_PBCD);
> -			tmp &= ~(0xff << ((where & 3) * 8));
> -			tmp |= value << ((where & 3) * 8);
> -
> -			__raw_writel(tmp, KS8695_PCI_VA +  KS8695_PBCD);
> -			break;
> -	}
> -
> -	return PCIBIOS_SUCCESSFUL;
> +	return KS8695_PCI_VA +  KS8695_PBCD;
>   }
>   
>   static void ks8695_local_writeconfig(int where, u32 value)
> @@ -137,8 +71,9 @@ static void ks8695_local_writeconfig(int where, u32 value)
>   }
>   
>   static struct pci_ops ks8695_pci_ops = {
> -	.read	= ks8695_pci_readconfig,
> -	.write	= ks8695_pci_writeconfig,
> +	.map_bus = ks8695_pci_map_bus,
> +	.read	= pci_generic_config_read32,
> +	.write	= pci_generic_config_write32,
>   };
>   
>   static struct resource pci_mem = {

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