LXR linux/drivers/dma/sh/shdma-arm.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Renesas SuperH DMA Engine support
   4 *
   5 * Copyright (C) 2013 Renesas Electronics, Inc.
   6 */
   7
   8#ifndef SHDMA_ARM_H
   9#define SHDMA_ARM_H
  10
  11#include "shdma.h"
  12
  13/* Transmit sizes and respective CHCR register values */
  14enum {
  15        XMIT_SZ_8BIT            = 0,
  16        XMIT_SZ_16BIT           = 1,
  17        XMIT_SZ_32BIT           = 2,
  18        XMIT_SZ_64BIT           = 7,
  19        XMIT_SZ_128BIT          = 3,
  20        XMIT_SZ_256BIT          = 4,
  21        XMIT_SZ_512BIT          = 5,
  22};
  23
  24/* log2(size / 8) - used to calculate number of transfers */
  25#define SH_DMAE_TS_SHIFT {              \
  26        [XMIT_SZ_8BIT]          = 0,    \
  27        [XMIT_SZ_16BIT]         = 1,    \
  28        [XMIT_SZ_32BIT]         = 2,    \
  29        [XMIT_SZ_64BIT]         = 3,    \
  30        [XMIT_SZ_128BIT]        = 4,    \
  31        [XMIT_SZ_256BIT]        = 5,    \
  32        [XMIT_SZ_512BIT]        = 6,    \
  33}
  34
  35#define TS_LOW_BIT      0x3 /* --xx */
  36#define TS_HI_BIT       0xc /* xx-- */
  37
  38#define TS_LOW_SHIFT    (3)
  39#define TS_HI_SHIFT     (20 - 2)        /* 2 bits for shifted low TS */
  40
  41#define TS_INDEX2VAL(i) \
  42        ((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\
  43         (((i) & TS_HI_BIT)  << TS_HI_SHIFT))
  44
  45#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL((xmit_sz)))
  46#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL((xmit_sz)))
  47
  48#endif
  49