1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Header file for the Atmel AHB DMA Controller driver 4 * 5 * Copyright (C) 2008 Atmel Corporation 6 */ 7 #ifndef AT_HDMAC_H 8 #define AT_HDMAC_H 9 10 #include <linux/dmaengine.h> 11 12 /** 13 * struct at_dma_platform_data - Controller configuration parameters 14 * @nr_channels: Number of channels supported by hardware (max 8) 15 * @cap_mask: dma_capability flags supported by the platform 16 */ 17 struct at_dma_platform_data { 18 unsigned int nr_channels; 19 dma_cap_mask_t cap_mask; 20 }; 21 22 /** 23 * struct at_dma_slave - Controller-specific information about a slave 24 * @dma_dev: required DMA master device 25 * @cfg: Platform-specific initializer for the CFG register 26 */ 27 struct at_dma_slave { 28 struct device *dma_dev; 29 u32 cfg; 30 }; 31 32 33 /* Platform-configurable bits in CFG */ 34 #define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */ 35 36 #define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */ 37 #define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */ 38 #define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */ 39 #define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */ 40 #define ATC_SRC_H2SEL_SW (0x0 << 9) 41 #define ATC_SRC_H2SEL_HW (0x1 << 9) 42 #define ATC_SRC_PER_MSB(h) (ATC_PER_MSB(h) << 10) /* Channel src rq (most significant bits) */ 43 #define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */ 44 #define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */ 45 #define ATC_DST_H2SEL_SW (0x0 << 13) 46 #define ATC_DST_H2SEL_HW (0x1 << 13) 47 #define ATC_DST_PER_MSB(h) (ATC_PER_MSB(h) << 14) /* Channel dst rq (most significant bits) */ 48 #define ATC_SOD (0x1 << 16) /* Stop On Done */ 49 #define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */ 50 #define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */ 51 #define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */ 52 #define ATC_LOCK_IF_L_CHUNK (0x0 << 22) 53 #define ATC_LOCK_IF_L_BUFFER (0x1 << 22) 54 #define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */ 55 #define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */ 56 #define ATC_FIFOCFG_LARGESTBURST (0x0 << 28) 57 #define ATC_FIFOCFG_HALFFIFO (0x1 << 28) 58 #define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28) 59 60 61 #endif /* AT_HDMAC_H */ 62