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author | Viresh Kumar <viresh.kumar@linaro.org> | 2012-10-16 09:49:17 +0530 |
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committer | Vinod Koul <vinod.koul@intel.com> | 2013-01-07 22:04:14 -0800 |
commit | a9ddb575d6d6c58c39e8c44a22b84445fedb0521 (patch) | |
tree | 3c3b520bb61163d963c417c5355ac7c7cb5ad049 /include/linux/dw_dmac.h | |
parent | 177d2bf5c7d3ab41bfb4ce2597dde668225958dd (diff) | |
download | linux-stable-a9ddb575d6d6c58c39e8c44a22b84445fedb0521.tar.gz linux-stable-a9ddb575d6d6c58c39e8c44a22b84445fedb0521.tar.bz2 linux-stable-a9ddb575d6d6c58c39e8c44a22b84445fedb0521.zip |
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.h | 43 |
1 files changed, 26 insertions, 17 deletions
diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h index 62a6190dee22..41766de66e33 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 */ |