drivers/dma/sh/shdma-arm.h

   1 /*
   2  * Renesas SuperH DMA Engine support
   3  *
   4  * Copyright (C) 2013 Renesas Electronics, Inc.
   5  *
   6  * This is free software; you can redistribute it and/or modify it under the
   7  * terms of version 2 the GNU General Public License as published by the Free
   8  * Software Foundation.
   9  */
  10
  11 #ifndef SHDMA_ARM_H
  12 #define SHDMA_ARM_H
  13
  14 #include "shdma.h"
  15
  16 /* Transmit sizes and respective CHCR register values */
  17 enum {
  18         XMIT_SZ_8BIT            = 0,
  19         XMIT_SZ_16BIT           = 1,
  20         XMIT_SZ_32BIT           = 2,
  21         XMIT_SZ_64BIT           = 7,
  22         XMIT_SZ_128BIT          = 3,
  23         XMIT_SZ_256BIT          = 4,
  24         XMIT_SZ_512BIT          = 5,
  25 };
  26
  27 /* log2(size / 8) - used to calculate number of transfers */
  28 #define SH_DMAE_TS_SHIFT {              \
  29         [XMIT_SZ_8BIT]          = 0,    \
  30         [XMIT_SZ_16BIT]         = 1,    \
  31         [XMIT_SZ_32BIT]         = 2,    \
  32         [XMIT_SZ_64BIT]         = 3,    \
  33         [XMIT_SZ_128BIT]        = 4,    \
  34         [XMIT_SZ_256BIT]        = 5,    \
  35         [XMIT_SZ_512BIT]        = 6,    \
  36 }
  37
  38 #define TS_LOW_BIT      0x3 /* --xx */
  39 #define TS_HI_BIT       0xc /* xx-- */
  40
  41 #define TS_LOW_SHIFT    (3)
  42 #define TS_HI_SHIFT     (20 - 2)        /* 2 bits for shifted low TS */
  43
  44 #define TS_INDEX2VAL(i) \
  45         ((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\
  46          (((i) & TS_HI_BIT)  << TS_HI_SHIFT))
  47
  48 #define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL((xmit_sz)))
  49 #define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL((xmit_sz)))
  50
  51 #endif