arch/unicore32/include/mach/dma.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/arch/unicore32/include/mach/dma.h
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  * Copyright (C) 2001-2010 GUAN Xue-tao
   8  */
   9 #ifndef __MACH_PUV3_DMA_H__
  10 #define __MACH_PUV3_DMA_H__
  11
  12 /*
  13  * The PKUnity has six internal DMA channels.
  14  */
  15 #define MAX_DMA_CHANNELS        6
  16
  17 typedef enum {
  18         DMA_PRIO_HIGH = 0,
  19         DMA_PRIO_MEDIUM = 1,
  20         DMA_PRIO_LOW = 2
  21 } puv3_dma_prio;
  22
  23 /*
  24  * DMA registration
  25  */
  26
  27 extern int puv3_request_dma(char *name,
  28                          puv3_dma_prio prio,
  29                          void (*irq_handler)(int, void *),
  30                          void (*err_handler)(int, void *),
  31                          void *data);
  32
  33 extern void puv3_free_dma(int dma_ch);
  34
  35 static inline void puv3_stop_dma(int ch)
  36 {
  37         writel(readl(DMAC_CONFIG(ch)) & ~DMAC_CONFIG_EN, DMAC_CONFIG(ch));
  38 }
  39
  40 static inline void puv3_resume_dma(int ch)
  41 {
  42         writel(readl(DMAC_CONFIG(ch)) | DMAC_CONFIG_EN, DMAC_CONFIG(ch));
  43 }
  44
  45 #endif /* __MACH_PUV3_DMA_H__ */