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 */
17enum {
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
52