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committed c6c93048baf * This function can be used as the of xlate callback for DMA driver which wants/* * Device tree helpers for DMA request / controller * * Based on of_gpio.c * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */static LIST_HEAD(of_dma_list);static DEFINE_MUTEX(of_dma_lock);/** * of_dma_find_controller - Get a DMA controller in DT DMA helpers list * @dma_spec: pointer to DMA specifier as found in the device tree * * Finds a DMA controller with matching device node and number for dma cells * in a list of registered DMA controllers. If a match is found a valid pointer * to the DMA data stored is retuned. A NULL pointer is returned if no match is * found. */static struct of_dma *of_dma_find_controller(struct of_phandle_args *dma_spec){ struct of_dma *ofdma; list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers) if (ofdma->of_node == dma_spec->np) return ofdma; pr_debug("%s: can't find DMA controller %pOF\n", __func__, dma_spec->np); return NULL;}/** * of_dma_router_xlate - translation function for router devices * @dma_spec: pointer to DMA specifier as found in the device tree * @of_dma: pointer to DMA controller data (router information) * * The function creates new dma_spec to be passed to the router driver's * of_dma_route_allocate() function to prepare a dma_spec which will be used * to request channel from the real DMA controller. */static struct dma_chan *of_dma_router_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma){ struct dma_chan *chan; struct of_dma *ofdma_target; struct of_phandle_args dma_spec_target; void *route_data;