projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| aa3da644 JH |
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 | int of_dma_nbcells; | |
| 25 | struct dma_chan *(*of_dma_xlate) | |
| 26 | (struct of_phandle_args *, struct of_dma *); | |
| 27 | void *of_dma_data; | |
| 9743a3b6 | 28 | int use_count; |
| aa3da644 JH |
29 | }; |
| 30 | ||
| 31 | struct of_dma_filter_info { | |
| 32 | dma_cap_mask_t dma_cap; | |
| 33 | dma_filter_fn filter_fn; | |
| 34 | }; | |
| 35 | ||
| 4c26bc60 | 36 | #ifdef CONFIG_OF |
| aa3da644 JH |
37 | extern int of_dma_controller_register(struct device_node *np, |
| 38 | struct dma_chan *(*of_dma_xlate) | |
| 39 | (struct of_phandle_args *, struct of_dma *), | |
| 40 | void *data); | |
| 9743a3b6 | 41 | extern int of_dma_controller_free(struct device_node *np); |
| aa3da644 JH |
42 | extern struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
| 43 | char *name); | |
| 44 | extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, | |
| 45 | struct of_dma *ofdma); | |
| 4c26bc60 | 46 | #else |
| 91f8aecc | 47 | static inline int of_dma_controller_register(struct device_node *np, |
| 4c26bc60 VK |
48 | struct dma_chan *(*of_dma_xlate) |
| 49 | (struct of_phandle_args *, struct of_dma *), | |
| 50 | void *data) | |
| 51 | { | |
| 52 | return -ENODEV; | |
| 53 | } | |
| 54 | ||
| 91f8aecc | 55 | static inline int of_dma_controller_free(struct device_node *np) |
| 4c26bc60 | 56 | { |
| 91f8aecc | 57 | return -ENODEV; |
| 4c26bc60 VK |
58 | } |
| 59 | ||
| 91f8aecc | 60 | static inline struct dma_chan *of_dma_request_slave_channel(struct device_node *np, |
| 4c26bc60 VK |
61 | char *name) |
| 62 | { | |
| 63 | return NULL; | |
| 64 | } | |
| 65 | ||
| 91f8aecc | 66 | static inline struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
| 4c26bc60 VK |
67 | struct of_dma *ofdma) |
| 68 | { | |
| 69 | return NULL; | |
| 70 | } | |
| 71 | ||
| 72 | #endif | |
| aa3da644 JH |
73 | |
| 74 | #endif /* __LINUX_OF_DMA_H */ |