| Andy Shevchenko | 2b49e0c | 2015-02-23 16:24:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the High Speed UART DMA |
| 3 | * |
| 4 | * Copyright (C) 2015 Intel Corporation |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #ifndef _DMA_HSU_H |
| 12 | #define _DMA_HSU_H |
| 13 | |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | |
| 17 | #include <linux/platform_data/dma-hsu.h> |
| 18 | |
| 19 | struct hsu_dma; |
| 20 | |
| 21 | /** |
| 22 | * struct hsu_dma_chip - representation of HSU DMA hardware |
| 23 | * @dev: struct device of the DMA controller |
| 24 | * @irq: irq line |
| 25 | * @regs: memory mapped I/O space |
| 26 | * @length: I/O space length |
| 27 | * @offset: offset of the I/O space where registers are located |
| 28 | * @hsu: struct hsu_dma that is filed by ->probe() |
| 29 | * @pdata: platform data for the DMA controller if provided |
| 30 | */ |
| 31 | struct hsu_dma_chip { |
| 32 | struct device *dev; |
| 33 | int irq; |
| 34 | void __iomem *regs; |
| 35 | unsigned int length; |
| 36 | unsigned int offset; |
| 37 | struct hsu_dma *hsu; |
| Andy Shevchenko | 2b49e0c | 2015-02-23 16:24:42 +0200 | [diff] [blame] | 38 | }; |
| 39 | |
| Heikki Krogerus | 47f82f1 | 2015-10-13 13:29:04 +0300 | [diff] [blame] | 40 | #if IS_ENABLED(CONFIG_HSU_DMA) |
| Andy Shevchenko | 2b49e0c | 2015-02-23 16:24:42 +0200 | [diff] [blame] | 41 | /* Export to the internal users */ |
| 42 | irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr); |
| 43 | |
| 44 | /* Export to the platform drivers */ |
| 45 | int hsu_dma_probe(struct hsu_dma_chip *chip); |
| 46 | int hsu_dma_remove(struct hsu_dma_chip *chip); |
| Heikki Krogerus | 47f82f1 | 2015-10-13 13:29:04 +0300 | [diff] [blame] | 47 | #else |
| 48 | static inline irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, |
| 49 | unsigned short nr) |
| 50 | { |
| 51 | return IRQ_NONE; |
| 52 | } |
| 53 | static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } |
| 54 | static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } |
| 55 | #endif /* CONFIG_HSU_DMA */ |
| Andy Shevchenko | 2b49e0c | 2015-02-23 16:24:42 +0200 | [diff] [blame] | 56 | |
| 57 | #endif /* _DMA_HSU_H */ |