From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <vinod.koul@intel.com>, <dan.j.williams@intel.com>,
Tony Lindgren <tony@atomide.com>,
Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: <dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-omap@vger.kernel.org>, <arnd@arndb.de>
Subject: [PATCH 1/2] dmaengine: dma_slave_config: add support for slave port window
Date: Tue, 25 Oct 2016 13:50:18 +0300 [thread overview]
Message-ID: <20161025105019.24475-2-peter.ujfalusi@ti.com> (raw)
In-Reply-To: <20161025105019.24475-1-peter.ujfalusi@ti.com>
Some slave devices uses address window instead of single register for read
and/or write of data. With the src/dst_port_window_size the address window
can be specified and the DMAengine driver should use this information to
correctly set up the transfer to loop within the provided window.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
include/linux/dmaengine.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index cc535a478bae..689d44327ef3 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -336,6 +336,12 @@ enum dma_slave_buswidth {
* may or may not be applicable on memory sources.
* @dst_maxburst: same as src_maxburst but for destination target
* mutatis mutandis.
+ * @src_port_window_size: The length of the register area the data need to be
+ * written on the device side. It is only used for devices which is using an
+ * area instead of a single register to receive the data. Typically the DMA
+ * loops in this area in order to transfer the data.
+ * @dst_port_window_size: same as src_port_window_size but for the destination
+ * port.
* @device_fc: Flow Controller Settings. Only valid for slave channels. Fill
* with 'true' if peripheral should be flow controller. Direction will be
* selected at Runtime.
@@ -363,6 +369,8 @@ struct dma_slave_config {
enum dma_slave_buswidth dst_addr_width;
u32 src_maxburst;
u32 dst_maxburst;
+ u32 src_port_window_size;
+ u32 dst_port_window_size;
bool device_fc;
unsigned int slave_id;
};
--
2.10.1
next prev parent reply other threads:[~2016-10-25 10:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-25 10:50 [PATCH 0/2] dmaengine: core/omap-dma: Support for port window Peter Ujfalusi
2016-10-25 10:50 ` Peter Ujfalusi [this message]
2016-10-25 10:50 ` [PATCH 2/2] dmaengine: omap-dma: Support for slave devices with data " Peter Ujfalusi
2016-11-14 4:35 ` Vinod Koul
2016-11-14 9:44 ` Peter Ujfalusi
2016-11-14 10:55 ` Vinod Koul
2016-11-14 11:49 ` Peter Ujfalusi
2016-11-14 10:53 ` Russell King - ARM Linux
2016-11-14 11:56 ` Peter Ujfalusi
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