include/linux/dma/hsu.h

   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;
  38 };
  39
  40 #if IS_ENABLED(CONFIG_HSU_DMA)
  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);
  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 */
  56
  57 #endif /* _DMA_HSU_H */