| | 1 | /* |
| | 2 | * OF helpers for DMA request / controller |
| | 3 | * |
| | 4 | * Based on of_gpio.h |
| | 5 | * |
| | 6 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ |
| | 7 | * |
| | 8 | * This program is free software; you can redistribute it and/or modify |
| | 9 | * it under the terms of the GNU General Public License version 2 as |
| | 10 | * published by the Free Software Foundation. |
| | 11 | */ |
| | 12 | |
| | 13 | #ifndef __LINUX_OF_DMA_H |
| | 14 | #define __LINUX_OF_DMA_H |
| | 15 | |
| | 16 | #include <linux/of.h> |
| | 17 | #include <linux/dmaengine.h> |
| | 18 | |
| | 19 | struct device_node; |
| | 20 | |
| | 21 | struct of_dma { |
| | 22 | struct list_head of_dma_controllers; |
| | 23 | struct device_node *of_node; |
| | 24 | struct dma_chan *(*of_dma_xlate) |
| | 25 | (struct of_phandle_args *, struct of_dma *); |
| | 26 | void *(*of_dma_route_allocate) |
| | 27 | (struct of_phandle_args *, struct of_dma *); |
| | 28 | struct dma_router *dma_router; |
| | 29 | void *of_dma_data; |
| | 30 | }; |
| | 31 | |
| | 32 | struct of_dma_filter_info { |
| | 33 | dma_cap_mask_t dma_cap; |
| | 34 | dma_filter_fn filter_fn; |
| | 35 | }; |
| | 36 | |
| | 37 | #ifdef CONFIG_DMA_OF |
| | 38 | extern int of_dma_controller_register(struct device_node *np, |
| | 39 | struct dma_chan *(*of_dma_xlate) |
| | 40 | (struct of_phandle_args *, struct of_dma *), |
| | 41 | void *data); |
| | 42 | extern void of_dma_controller_free(struct device_node *np); |
| | 43 | |
| | 44 | extern int of_dma_router_register(struct device_node *np, |
| | 45 | void *(*of_dma_route_allocate) |
| | 46 | (struct of_phandle_args *, struct of_dma *), |
| | 47 | struct dma_router *dma_router); |
| | 48 | #define of_dma_router_free of_dma_controller_free |
| | 49 | |
| | 50 | extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
| | 51 | const char *name); |
| | 52 | extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
| | 53 | struct of_dma *ofdma); |
| | 54 | extern struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, |
| | 55 | struct of_dma *ofdma); |
| | 56 | |
| | 57 | #else |
| | 58 | static inline int of_dma_controller_register(struct device_node *np, |
| | 59 | struct dma_chan *(*of_dma_xlate) |
| | 60 | (struct of_phandle_args *, struct of_dma *), |
| | 61 | void *data) |
| | 62 | { |
| | 63 | return -ENODEV; |
| | 64 | } |
| | 65 | |
| | 66 | static inline void of_dma_controller_free(struct device_node *np) |
| | 67 | { |
| | 68 | } |
| | 69 | |
| | 70 | static inline int of_dma_router_register(struct device_node *np, |
| | 71 | void *(*of_dma_route_allocate) |
| | 72 | (struct of_phandle_args *, struct of_dma *), |
| | 73 | struct dma_router *dma_router) |
| | 74 | { |
| | 75 | return -ENODEV; |
| | 76 | } |
| | 77 | |
| | 78 | #define of_dma_router_free of_dma_controller_free |
| | 79 | |
| | 80 | static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
| | 81 | const char *name) |
| | 82 | { |
| | 83 | return ERR_PTR(-ENODEV); |
| | 84 | } |
| | 85 | |
| | 86 | static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
| | 87 | struct of_dma *ofdma) |
| | 88 | { |
| | 89 | return NULL; |
| | 90 | } |
| | 91 | |
| | 92 | #define of_dma_xlate_by_chan_id NULL |
| | 93 | |
| | 94 | #endif |
| | 95 | |
| | 96 | #endif /* __LINUX_OF_DMA_H */ |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental