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 52
