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From: Gerd Hoffmann <kraxel@redhat.com>
To: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: shashank chaturvedi <chaturvedi9950@gmail.com>,
	linux-usb@vger.kernel.org, linux-pci@vger.kernel.org
Subject: Re: xhci Portsc register issue
Date: Fri, 26 Oct 2012 09:12:12 +0200	[thread overview]
Message-ID: <508A37CC.5060900@redhat.com> (raw)
In-Reply-To: <20121025153552.GA5205@xanatos>


  Hi,

> But I'm not sure, since I've never attempted to memory map PCI registers
> from userspace.  I was under the impression that you just can't do that.

You can mmap /sys/bus/pci/devices(${device}/resource0.  Just hacked up a
tool which dumps the capability registers this way:

http://www.kraxel.org/cgit/usb-tools/tree/usb-print-caps.c

cheers,
  Gerd


      parent reply	other threads:[~2012-10-26  7:12 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CALuomMuUD4xSaCUT6MZn3ZV2gjXnuBUhkz78PgXZ6XgV4e-NvA@mail.gmail.com>
2012-10-25 15:36 ` xhci Portsc register issue Sarah Sharp
2012-10-25 16:45   ` Bjorn Helgaas
2012-10-25 22:37   ` Peter Stuge
     [not found]     ` <CALuomMs-Z_PH3KpEPDgjBr5oy86Go2G2PAxu_k2yxgzWwRhJYQ@mail.gmail.com>
2012-10-26 17:17       ` Sarah Sharp
2012-10-26  7:12   ` Gerd Hoffmann [this message]

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