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/errno.h>
  12 #include <linux/kconfig.h>
  13 #include <linux/types.h>
  14
  15 #include <linux/platform_data/dma-hsu.h>
  16
  17 struct device;
  18 struct hsu_dma;
  19
  20 /**
  21  * struct hsu_dma_chip - representation of HSU DMA hardware
  22  * @dev:                 struct device of the DMA controller
  23  * @irq:                 irq line
  24  * @regs:                memory mapped I/O space
  25  * @length:              I/O space length
  26  * @offset:              offset of the I/O space where registers are located
  27  * @hsu:                 struct hsu_dma that is filed by ->probe()
  28  * @pdata:               platform data for the DMA controller if provided
  29  */
  30 struct hsu_dma_chip {
  31         struct device                   *dev;
  32         int                             irq;
  33         void __iomem                    *regs;
  34         unsigned int                    length;
  35         unsigned int                    offset;
  36         struct hsu_dma                  *hsu;
  37 };
  38
  39 #if IS_ENABLED(CONFIG_HSU_DMA)
  40 /* Export to the internal users */
  41 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr,
  42                        u32 *status);
  43 int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status);
  44
  45 /* Export to the platform drivers */
  46 int hsu_dma_probe(struct hsu_dma_chip *chip);
  47 int hsu_dma_remove(struct hsu_dma_chip *chip);
  48 #else
  49 static inline int hsu_dma_get_status(struct hsu_dma_chip *chip,
  50                                      unsigned short nr, u32 *status)
  51 {
  52         return 0;
  53 }
  54 static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr,
  55                                  u32 status)
  56 {
  57         return 0;
  58 }
  59 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; }
  60 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; }
  61 #endif /* CONFIG_HSU_DMA */
  62
  63 #endif /* _DMA_HSU_H */