From 65e8b083fc8ec303499baa1924ae032d46d29990 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Wed, 30 Jul 2008 20:29:03 +0200 Subject: atmel-mci: Add experimental DMA support 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: Haavard Skinnemoen --- arch/avr32/include/asm/atmel-mci.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/avr32/include/asm') diff --git a/arch/avr32/include/asm/atmel-mci.h b/arch/avr32/include/asm/atmel-mci.h index 5d5ae1295cfd..59f3fadd0b68 100644 --- a/arch/avr32/include/asm/atmel-mci.h +++ b/arch/avr32/include/asm/atmel-mci.h @@ -3,6 +3,8 @@ #define ATMEL_MCI_MAX_NR_SLOTS 2 +struct dma_slave; + /** * struct mci_slot_pdata - board-specific per-slot configuration * @bus_width: Number of data lines wired up the slot @@ -26,9 +28,11 @@ struct mci_slot_pdata { /** * struct mci_platform_data - board-specific MMC/SDcard configuration + * @dma_slave: DMA slave interface to use in data transfers, or NULL. * @slot: Per-slot configuration data. */ struct mci_platform_data { + struct dma_slave *dma_slave; struct mci_slot_pdata slot[ATMEL_MCI_MAX_NR_SLOTS]; }; -- cgit v1.2.3