1. 14 Jan, 2016 2 commits
  2. 10 Nov, 2014 1 commit
  3. 09 Sep, 2014 1 commit
  4. 26 Oct, 2011 1 commit
  5. 15 Dec, 2009 1 commit
  6. 08 Apr, 2009 1 commit
  7. 05 Jan, 2009 1 commit
  8. 05 Oct, 2008 3 commits
    • Haavard Skinnemoen's avatar
      atmel-mci: Add experimental DMA support · 65e8b083
      Haavard Skinnemoen authored
      This adds support for DMA transfers through the generic DMA engine
      framework with the DMA slave extensions.
      
      The driver has been tested using mmc-block and ext3fs on several SD,
      SDHC and MMC+ cards. Reads and writes work fine, with read transfer
      rates up to 7.5 MiB/s on fast cards with debugging disabled.
      
      Unfortunately, the driver has been known to lock up from time to time
      with DMA enabled, so DMA support is currently optional and marked
      EXPERIMENTAL. However, I didn't see any problems while testing 13
      different cards (MMC, SD and SDHC of different brands and sizes), so I
      suspect the "Initialize BLKR before sending data transfer command" fix
      that was posted earlier fixed this as well.
      Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
      65e8b083
    • Haavard Skinnemoen's avatar
      atmel-mci: support multiple mmc slots · 965ebf33
      Haavard Skinnemoen authored
      The Atmel MCI controller can drive multiple cards through separate sets
      of pins, but only one at a time. This patch adds support for
      multiplexing access to the controller so that multiple card slots can be
      used as if they were hooked up to separate mmc controllers.
      
      The atmel-mci driver registers each slot as a separate mmc_host. Both
      access the same common controller state, but they also have some state
      on their own for card detection/write protect handling, and separate
      shadows of the MR and SDCR registers.
      
      When one of the slots receives a request from the mmc core, the common
      controller state is checked. If it's idle, the request is submitted
      immediately. If not, the request is added to a queue. When a request is
      done, the queue is checked and if there is a queued request, it is
      submitted before the completion callback is called.
      
      This patch also includes a few cleanups and fixes, including a locking
      overhaul. I had to change the locking extensively in any case, so I
      might as well try to get it right. The driver no longer takes any
      irq-safe locks, which may or may not improve the overall system
      performance.
      
      This patch also adds a bit of documentation of the internal data
      structures.
      Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
      965ebf33
    • Haavard Skinnemoen's avatar
      atmel-mci: Platform code for supporting multiple mmc slots · 6b918657
      Haavard Skinnemoen authored
      Add the necessary platform infrastructure to support multiple mmc/sdcard
      slots all at once through a single controller. Currently, the driver
      will use the first valid slot it finds and stick with that, but later
      patches will add support for switching between several slots on the fly.
      
      Extend the platform data structure with per-slot information: MMC/SDcard
      bus width and card detect/write protect pins. This will affect the pin
      muxing as well as the capabilities announced to the mmc core.
      
      Note that board code is now required to supply a mci_platform_data
      struct to at32_add_device_mci().
      Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
      6b918657
  9. 05 Aug, 2008 1 commit
  10. 15 Jul, 2008 1 commit
    • Haavard Skinnemoen's avatar
      atmel-mci: Driver for Atmel on-chip MMC controllers · 7d2be074
      Haavard Skinnemoen authored
      This is a driver for the MMC controller on the AP7000 chips from
      Atmel. It should in theory work on AT91 systems too with some
      tweaking, but since the DMA interface is quite different, it's not
      entirely clear if it's worth merging this with the at91_mci driver.
      
      This driver has been around for a while in BSPs and kernel sources
      provided by Atmel, but this particular version uses the generic DMA
      Engine framework (with the slave extensions) instead of an
      avr32-only DMA controller framework.
      
      This driver can also use PIO transfers when no DMA channels are
      available, and for transfers where using DMA may be difficult or
      impractical for some reason (e.g. the DMA setup overhead is usually
      not worth it for very short transfers, and badly aligned buffers or
      lengths are difficult to handle.)
      
      Currently, the driver only support PIO transfers. DMA support has been
      split out to a separate patch to hopefully make it easier to review.
      
      The driver has been tested using mmc-block and ext3fs on several SD,
      SDHC and MMC+ cards. Reads and writes work fine, with read transfer
      rates up to 3.5 MiB/s on fast cards with debugging disabled.
      
      The driver has also been tested using the mmc_test module on the same
      cards. All tests except 7, 9, 15 and 17 succeed. The first two are
      unsupported by all the cards I have, so I don't know if the driver
      handles this correctly. The last two fail because the hardware flags a
      Data CRC Error instead of a Data Timeout error. I'm not sure how to deal
      with that.
      
      Documentation for this controller can be found in many data sheets from
      Atmel, including the AT32AP7000 data sheet which can be found here:
      
      http://www.atmel.com/dyn/products/datasheets.asp?family_id=682Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
      Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
      7d2be074