Lines Matching full:dma

3  * Device tree helpers for DMA request / controller
24  * of_dma_find_controller - Get a DMA controller in DT DMA helpers list
25  * @dma_spec:	pointer to DMA specifier as found in the device tree
27  * Finds a DMA controller with matching device node and number for dma cells
28  * in a list of registered DMA controllers. If a match is found a valid pointer
29  * to the DMA data stored is returned. A NULL pointer is returned if no match is
40 	pr_debug("%s: can't find DMA controller %pOF\n", __func__,  in of_dma_find_controller()
48  * @dma_spec:	pointer to DMA specifier as found in the device tree
49  * @ofdma:	pointer to DMA controller data (router information)
53  * to request channel from the real DMA controller.
63 	/* translate the request for the real DMA controller */  in of_dma_router_xlate()
106  * of_dma_controller_register - Register a DMA controller to DT DMA helpers
107  * @np:			device node of DMA controller
148  * of_dma_controller_free - Remove a DMA controller from DT DMA helpers list
149  * @np:		device node of DMA controller
171  * of_dma_router_register - Register a DMA router to DT DMA helpers as a
173  * @np:				device node of DMA router
175  *				modify the dma_spec for the DMA controller to
216  * of_dma_match_channel - Check if a DMA specifier matches name
217  * @np:		device node to look for DMA channels
219  * @index:	index of DMA specifier in list of DMA specifiers
220  * @dma_spec:	pointer to DMA specifier as found in the device tree
222  * Check if the DMA specifier pointed to by the index in a list of DMA
224  * a valid pointer to the DMA specifier is found. Otherwise returns -ENODEV.
231 	if (of_property_read_string_index(np, "dma-names", index, &s))  in of_dma_match_channel()
237 	if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,  in of_dma_match_channel()
245  * of_dma_request_slave_channel - Get the DMA slave channel
246  * @np:		device node to get DMA request from
249  * Returns pointer to appropriate DMA channel on success or an error pointer.
270 	count = of_property_count_strings(np, "dma-names");  in of_dma_request_slave_channel()
272 		pr_err("%s: dma-names property of node '%pOF' missing or empty\n",  in of_dma_request_slave_channel()
311  * of_dma_simple_xlate - Simple DMA engine translation function
312  * @dma_spec:	pointer to DMA specifier as found in the device tree
313  * @ofdma:	pointer to DMA controller data
316  * filter_param when calling the DMA engine dma_request_channel() function.
317  * Note that this translation function requires that #dma-cells is equal to 1
318  * and the argument of the dma specifier is the 32-bit filter_param. Returns
319  * pointer to appropriate dma channel on success or NULL on error.
339  * of_dma_xlate_by_chan_id - Translate dt property to DMA channel by channel id
340  * @dma_spec:	pointer to DMA specifier as found in the device tree
341  * @ofdma:	pointer to DMA controller data
343  * This function can be used as the of xlate callback for DMA driver which wants
345  * the #dma-cells property of the DMA controller dt node needs to be set to 1.
349  * Returns pointer to appropriate dma channel on success or NULL on error.