arch/mips/include/asm/mach-lantiq/xway/xway_dma.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *
   4  *   Copyright (C) 2011 John Crispin <john@phrozen.org>
   5  */
   6
   7 #ifndef LTQ_DMA_H__
   8 #define LTQ_DMA_H__
   9
  10 #define LTQ_DESC_SIZE           0x08    /* each descriptor is 64bit */
  11 #define LTQ_DESC_NUM            0xC0    /* 192 descriptors / channel */
  12
  13 #define LTQ_DMA_OWN             BIT(31) /* owner bit */
  14 #define LTQ_DMA_C               BIT(30) /* complete bit */
  15 #define LTQ_DMA_SOP             BIT(29) /* start of packet */
  16 #define LTQ_DMA_EOP             BIT(28) /* end of packet */
  17 #define LTQ_DMA_TX_OFFSET(x)    ((x & 0x1f) << 23) /* data bytes offset */
  18 #define LTQ_DMA_RX_OFFSET(x)    ((x & 0x7) << 23) /* data bytes offset */
  19 #define LTQ_DMA_SIZE_MASK       (0xffff) /* the size field is 16 bit */
  20
  21 struct ltq_dma_desc {
  22         u32 ctl;
  23         u32 addr;
  24 };
  25
  26 struct ltq_dma_channel {
  27         int nr;                         /* the channel number */
  28         int irq;                        /* the mapped irq */
  29         int desc;                       /* the current descriptor */
  30         struct ltq_dma_desc *desc_base; /* the descriptor base */
  31         int phys;                       /* physical addr */
  32         struct device *dev;
  33 };
  34
  35 enum {
  36         DMA_PORT_ETOP = 0,
  37         DMA_PORT_DEU,
  38 };
  39
  40 extern void ltq_dma_enable_irq(struct ltq_dma_channel *ch);
  41 extern void ltq_dma_disable_irq(struct ltq_dma_channel *ch);
  42 extern void ltq_dma_ack_irq(struct ltq_dma_channel *ch);
  43 extern void ltq_dma_open(struct ltq_dma_channel *ch);
  44 extern void ltq_dma_close(struct ltq_dma_channel *ch);
  45 extern void ltq_dma_alloc_tx(struct ltq_dma_channel *ch);
  46 extern void ltq_dma_alloc_rx(struct ltq_dma_channel *ch);
  47 extern void ltq_dma_free(struct ltq_dma_channel *ch);
  48 extern void ltq_dma_init_port(int p, int tx_burst, int rx_burst);
  49
  50 #endif