| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Driver for the Synopsys DesignWare DMA Controller |
| 3 | * |
| 4 | * Copyright (C) 2007 Atmel Corporation |
| 5 | * Copyright (C) 2010-2011 ST Microelectronics |
| 6 | * Copyright (C) 2014 Intel Corporation |
| 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 | #ifndef _DMA_DW_H |
| 13 | #define _DMA_DW_H |
| 14 | |
| 15 | #include <linux/clk.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/dmaengine.h> |
| 18 | |
| 19 | #include <linux/platform_data/dma-dw.h> |
| 20 | |
| 21 | struct dw_dma; |
| 22 | |
| 23 | /** |
| 24 | * struct dw_dma_chip - representation of DesignWare DMA controller hardware |
| 25 | * @dev: struct device of the DMA controller |
| 26 | * @irq: irq line |
| 27 | * @regs: memory mapped I/O space |
| 28 | * @clk: hclk clock |
| 29 | * @dw: struct dw_dma that is filed by dw_dma_probe() |
| 30 | */ |
| 31 | struct dw_dma_chip { |
| 32 | struct device *dev; |
| 33 | int irq; |
| 34 | void __iomem *regs; |
| 35 | struct clk *clk; |
| 36 | struct dw_dma *dw; |
| 37 | }; |
| 38 | |
| 39 | /* Export to the platform drivers */ |
| 40 | int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata); |
| 41 | int dw_dma_remove(struct dw_dma_chip *chip); |
| 42 | |
| 43 | /* DMA API extensions */ |
| 44 | struct dw_desc; |
| 45 | |
| 46 | struct dw_cyclic_desc { |
| 47 | struct dw_desc **desc; |
| 48 | unsigned long periods; |
| 49 | void (*period_callback)(void *param); |
| 50 | void *period_callback_param; |
| 51 | }; |
| 52 | |
| 53 | struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, |
| 54 | dma_addr_t buf_addr, size_t buf_len, size_t period_len, |
| 55 | enum dma_transfer_direction direction); |
| 56 | void dw_dma_cyclic_free(struct dma_chan *chan); |
| 57 | int dw_dma_cyclic_start(struct dma_chan *chan); |
| 58 | void dw_dma_cyclic_stop(struct dma_chan *chan); |
| 59 | |
| 60 | dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan); |
| 61 | |
| 62 | dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan); |
| 63 | |
| 64 | #endif /* _DMA_DW_H */ |