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 */
  14 enum {
  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