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authorViresh Kumar <viresh.kumar@linaro.org>2012-10-16 09:49:17 +0530
committerVinod Koul <vinod.koul@intel.com>2013-01-07 22:04:14 -0800
commita9ddb575d6d6c58c39e8c44a22b84445fedb0521 (patch)
tree3c3b520bb61163d963c417c5355ac7c7cb5ad049 /include/linux/dw_dmac.h
parent177d2bf5c7d3ab41bfb4ce2597dde668225958dd (diff)
downloadop-kernel-dev-a9ddb575d6d6c58c39e8c44a22b84445fedb0521.zip
op-kernel-dev-a9ddb575d6d6c58c39e8c44a22b84445fedb0521.tar.gz
dmaengine: dw_dmac: Enhance device tree support
dw_dmac driver already supports device tree but it used to have its platform data passed the non-DT way. This patch does following changes: - pass platform data via DT, non-DT way still takes precedence if both are used. - create generic filter routine - Earlier slave information was made available by slave specific filter routines in chan->private field. Now, this information would be passed from within dmac DT node. Slave drivers would now be required to pass bus_id (a string) as parameter to this generic filter(), which would be compared against the slave data passed from DT, by the generic filter routine. - Update binding document Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> [Fixed __devinit usage] Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'include/linux/dw_dmac.h')
-rw-r--r--include/linux/dw_dmac.h43
1 files changed, 26 insertions, 17 deletions
diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h
index 62a6190..41766de 100644
--- a/include/linux/dw_dmac.h
+++ b/include/linux/dw_dmac.h
@@ -15,6 +15,26 @@
#include <linux/dmaengine.h>
/**
+ * struct dw_dma_slave - Controller-specific information about a slave
+ *
+ * @dma_dev: required DMA master device. Depricated.
+ * @bus_id: name of this device channel, not just a device name since
+ * devices may have more than one channel e.g. "foo_tx"
+ * @cfg_hi: Platform-specific initializer for the CFG_HI register
+ * @cfg_lo: Platform-specific initializer for the CFG_LO register
+ * @src_master: src master for transfers on allocated channel.
+ * @dst_master: dest master for transfers on allocated channel.
+ */
+struct dw_dma_slave {
+ struct device *dma_dev;
+ const char *bus_id;
+ u32 cfg_hi;
+ u32 cfg_lo;
+ u8 src_master;
+ u8 dst_master;
+};
+
+/**
* struct dw_dma_platform_data - Controller configuration parameters
* @nr_channels: Number of channels supported by hardware (max 8)
* @is_private: The device channels should be marked as private and not for
@@ -25,6 +45,8 @@
* @nr_masters: Number of AHB masters supported by the controller
* @data_width: Maximum data width supported by hardware per AHB master
* (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
+ * @sd: slave specific data. Used for configuring channels
+ * @sd_count: count of slave data structures passed.
*/
struct dw_dma_platform_data {
unsigned int nr_channels;
@@ -38,6 +60,9 @@ struct dw_dma_platform_data {
unsigned short block_size;
unsigned char nr_masters;
unsigned char data_width[4];
+
+ struct dw_dma_slave *sd;
+ unsigned int sd_count;
};
/* bursts size */
@@ -52,23 +77,6 @@ enum dw_dma_msize {
DW_DMA_MSIZE_256,
};
-/**
- * struct dw_dma_slave - Controller-specific information about a slave
- *
- * @dma_dev: required DMA master device
- * @cfg_hi: Platform-specific initializer for the CFG_HI register
- * @cfg_lo: Platform-specific initializer for the CFG_LO register
- * @src_master: src master for transfers on allocated channel.
- * @dst_master: dest master for transfers on allocated channel.
- */
-struct dw_dma_slave {
- struct device *dma_dev;
- u32 cfg_hi;
- u32 cfg_lo;
- u8 src_master;
- u8 dst_master;
-};
-
/* Platform-configurable bits in CFG_HI */
#define DWC_CFGH_FCMODE (1 << 0)
#define DWC_CFGH_FIFO_MODE (1 << 1)
@@ -106,5 +114,6 @@ void dw_dma_cyclic_stop(struct dma_chan *chan);
dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan);
dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan);
+bool dw_dma_generic_filter(struct dma_chan *chan, void *param);
#endif /* DW_DMAC_H */
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