From mboxrd@z Thu Jan 1 00:00:00 1970 From: w.sang@pengutronix.de (Wolfram Sang) Date: Fri, 25 Feb 2011 11:55:30 +0100 Subject: [PATCH v4] dmaengine: mxs-dma: add dma support for i.MX23/28 In-Reply-To: <1298619259-14344-1-git-send-email-shawn.guo@freescale.com> References: <1298619259-14344-1-git-send-email-shawn.guo@freescale.com> Message-ID: <20110225105530.GA2178@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Shawn, On Fri, Feb 25, 2011 at 03:34:19PM +0800, Shawn Guo wrote: > This patch adds dma support for Freescale MXS-based SoC i.MX23/28, > including apbh-dma and apbx-dma. > > * apbh-dma and apbx-dma are supported in the driver as two mxs-dma > instances. > > * apbh-dma is different between mx23 and mx28, hardware version > register is used to differentiate. > > * mxs-dma supports pio function besides data transfer. The driver > uses dma_data_direction DMA_NONE to identify the pio mode, and > steals sgl and sg_len to get pio words and numbers from clients. > > * mxs dmaengine has some very specific features, like sense function > and the special NAND support (nand_lock, nand_wait4ready). These > are too specific to implemented in generic dmaengine driver. > > * The driver refers to imx-sdma and only a single descriptor is > statically assigned to each channel. > > Signed-off-by: Shawn Guo > --- What are (roughly) the changes since last version? Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 198 bytes Desc: Digital signature URL: