include/linux/dma/hsu.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Driver for the High Speed UART DMA
   4  *
   5  * Copyright (C) 2015 Intel Corporation
   6  */
   7
   8 #ifndef _DMA_HSU_H
   9 #define _DMA_HSU_H
  10
  11 #include <linux/device.h>
  12 #include <linux/interrupt.h>
  13
  14 #include <linux/platform_data/dma-hsu.h>
  15
  16 struct hsu_dma;
  17
  18 /**
  19  * struct hsu_dma_chip - representation of HSU DMA hardware
  20  * @dev:                 struct device of the DMA controller
  21  * @irq:                 irq line
  22  * @regs:                memory mapped I/O space
  23  * @length:              I/O space length
  24  * @offset:              offset of the I/O space where registers are located
  25  * @hsu:                 struct hsu_dma that is filed by ->probe()
  26  * @pdata:               platform data for the DMA controller if provided
  27  */
  28 struct hsu_dma_chip {
  29         struct device                   *dev;
  30         int                             irq;
  31         void __iomem                    *regs;
  32         unsigned int                    length;
  33         unsigned int                    offset;
  34         struct hsu_dma                  *hsu;
  35 };
  36
  37 #if IS_ENABLED(CONFIG_HSU_DMA)
  38 /* Export to the internal users */
  39 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr,
  40                        u32 *status);
  41 int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status);
  42
  43 /* Export to the platform drivers */
  44 int hsu_dma_probe(struct hsu_dma_chip *chip);
  45 int hsu_dma_remove(struct hsu_dma_chip *chip);
  46 #else
  47 static inline int hsu_dma_get_status(struct hsu_dma_chip *chip,
  48                                      unsigned short nr, u32 *status)
  49 {
  50         return 0;
  51 }
  52 static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
  53                                  u32 status)
  54 {
  55         return 0;
  56 }
  57 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; }
  58 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; }
  59 #endif /* CONFIG_HSU_DMA */
  60
  61 #endif /* _DMA_HSU_H */