tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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