linux-kernel - Re: [PATCH V5 Resend] ST SPEAr: PCIE gadget suppport

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Date:	Wed, 23 Feb 2011 16:06:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pratyush Anand <pratyush.anand@...com>
Cc:	<rdunlap@...otime.net>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <gregkh@...e.de>,
	<jbarnes@...tuousgeek.org>, <viresh.kumar@...com>,
	<shiraz.hashim@...com>
Subject: Re: [PATCH V5 Resend] ST SPEAr: PCIE gadget suppport

On Mon, 21 Feb 2011 13:50:55 +0530
Pratyush Anand <pratyush.anand@...com> wrote:

> This is a configurable gadget. can be configured by configfs interface. Any
> IP available at PCIE bus can be programmed to be used by host
> controller.It supoorts both INTX and MSI.
> By default, gadget is configured for INTX and SYSRAM1 is mapped to BAR0
> with size 0x1000
> 
> Changes since V4:
> - All documentation related comments incorporated
> 
> Changes since V3:
> - support for multiple instances of such device

^^ This doesn't seem to agree with the documentation.

> ...
>
> --- /dev/null
> +++ b/Documentation/ABI/testing/configfs-spear-pcie-gadget
> @@ -0,0 +1,30 @@
> +What:		/config/pcie-gadget
> +Date:		Feb 2011
> +KernelVersion:	2.6.37
> +Contact:	Pratyush Anand <pratyush.anand@...com>
> +Description:
> +
> +	Interface is used to configure selected dual mode PCIe controller
> +	as device and then program its various registers to configure it
> +	as a particular device type.
> +	This interfaces can be used to show spear's PCIe device capability.
> +
> +	Nodes are only visible when configfs is mounted. To mount configfs
> +	in /config directory use:
> +	# mount -t configfs none /config/
> +
> +	/config/pcie-gadget/
> +		link ... used to enable ltssm and read its status.
> +		int_type ...used to configure and read type of supported
> +			interrupt
> +		no_of_msi ... used to configure number of MSI vector needed and
> +			to read no of MSI granted.
> +		inta ... write 1 to assert INTA and 0 to de-assert.
> +		send_msi ... write MSI vector to be sent.
> +		vendor_id ... used to write and read vendor id (hex)
> +		device_id ... used to write and read device id (hex)
> +		bar0_size ... used to write and read bar0_size
> +		bar0_address ... used to write and read bar0 mapped area in hex.
> +		bar0_rw_offset ... used to write and read offset of bar0 where
> +			bar0_data will be written or read.
> +		bar0_data ... used to write and read data at bar0_rw_offset.

What's the configfs naming scheme for the second and later devices?


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