Skip to content

L
linux
An error occurred fetching the project authors.
Switch branch/tag
  1. 15 Dec, 2009 1 commit
  3. 07 Oct, 2009 1 commit
    • Robin Getz's avatar
      Blackfin: mass clean up of copyright/licensing info · 96f1050d
      Robin Getz authored 
      Bill Gatliff & David Brownell pointed out we were missing some
copyrights, and licensing terms in some of the files in
./arch/blackfin, so this fixes things, and cleans them up.

It also removes:
 - verbose GPL text(refer to the top level ./COPYING file)
 - file names (you are looking at the file)
 - bug url (it's in the ./MAINTAINERS file)
 - "or later" on GPL-2, when we did not have that right

It also allows some Blackfin-specific assembly files to be under a BSD
like license (for people to use them outside of Linux).
Signed-off-by: default avatarRobin Getz <robin.getz@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
      96f1050d
  5. 19 Jun, 2009 1 commit
  7. 12 Jun, 2009 1 commit
  9. 07 Jan, 2009 1 commit
  11. 18 Nov, 2008 1 commit
  13. 16 Oct, 2008 1 commit
  15. 27 Aug, 2008 1 commit
  17. 17 May, 2008 1 commit
  19. 06 Feb, 2008 1 commit
  21. 17 Nov, 2007 1 commit
    • Michael Hennerich's avatar
      Blackfin arch: Add assembly function insl_16 · 5c91fb90
      Michael Hennerich authored 
      /*
 * CPUs often take a performance hit when accessing unaligned memory
 * locations. The actual performance hit varies, it can be small if the
 * hardware handles it or large if we have to take an exception and fix
 * it
 * in software.
 *
 * Since an ethernet header is 14 bytes network drivers often end up
 * with
 * the IP header at an unaligned offset. The IP header can be aligned by
 * shifting the start of the packet by 2 bytes. Drivers should do this
 * with:
 *
 * skb_reserve(NET_IP_ALIGN);
 *
 * The downside to this alignment of the IP header is that the DMA is
 * now
 * unaligned. On some architectures the cost of an unaligned DMA is high
 * and this cost outweighs the gains made by aligning the IP header.
 *
 * Since this trade off varies between architectures, we allow
 * NET_IP_ALIGN
 * to be overridden.
 */

This new function insl_16 allows to read form 32-bit IO and writes to
16-bit aligned memory. This is useful in above described scenario -
In particular with the AXIS AX88180 Gigabit Ethernet MAC.
Once the device is in 32-bit mode, reads from the RX FIFO always
decrements 4bytes.
While on the other side the destination address in SDRAM is always
16-bit aligned.
If we use skb_reserve(0) the receive buffer is 32-bit aligned but later
we hit a unaligned exception in the IP code.
Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
      5c91fb90
  23. 17 Oct, 2007 1 commit
  25. 09 Oct, 2007 1 commit
  27. 12 Sep, 2007 1 commit
  29. 21 Jun, 2007 1 commit
  31. 21 May, 2007 1 commit
  33. 07 May, 2007 1 commit
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7