1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Driver for the High Speed UART DMA 4 * 5 * Copyright (C) 2015 Intel Corporation 6 * 7 * Partially based on the bits found in drivers/tty/serial/mfd.c. 8 */ 9 10 #ifndef __DMA_HSU_H__ 11 #define __DMA_HSU_H__ 12 13 #include <linux/bits.h> 14 #include <linux/container_of.h> 15 #include <linux/io.h> 16 #include <linux/types.h> 17 18 #include <linux/dma/hsu.h> 19 20 #include "../virt-dma.h" 21 22 #define HSU_CH_SR 0x00 /* channel status */ 23 #define HSU_CH_CR 0x04 /* channel control */ 24 #define HSU_CH_DCR 0x08 /* descriptor control */ 25 #define HSU_CH_BSR 0x10 /* FIFO buffer size */ 26 #define HSU_CH_MTSR 0x14 /* minimum transfer size */ 27 #define HSU_CH_DxSAR(x) (0x20 + 8 * (x)) /* desc start addr */ 28 #define HSU_CH_DxTSR(x) (0x24 + 8 * (x)) /* desc transfer size */ 29 #define HSU_CH_D0SAR 0x20 /* desc 0 start addr */ 30 #define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */ 31 #define HSU_CH_D1SAR 0x28 32 #define HSU_CH_D1TSR 0x2c 33 #define HSU_CH_D2SAR 0x30 34 #define HSU_CH_D2TSR 0x34 35 #define HSU_CH_D3SAR 0x38 36 #define HSU_CH_D3TSR 0x3c 37 38 #define HSU_DMA_CHAN_NR_DESC 4 39 #define HSU_DMA_CHAN_LENGTH 0x40 40 41 /* Bits in HSU_CH_SR */ 42 #define HSU_CH_SR_DESCTO(x) BIT(8 + (x)) 43 #define HSU_CH_SR_DESCTO_ANY GENMASK(11, 8) 44 #define HSU_CH_SR_CHE BIT(15) 45 #define HSU_CH_SR_DESCE(x) BIT(16 + (x)) 46 #define HSU_CH_SR_DESCE_ANY GENMASK(19, 16) 47 #define HSU_CH_SR_CDESC_ANY GENMASK(31, 30) 48 49 /* Bits in HSU_CH_CR */ 50 #define HSU_CH_CR_CHA BIT(0) 51 #define HSU_CH_CR_CHD BIT(1) 52 53 /* Bits in HSU_CH_DCR */ 54 #define HSU_CH_DCR_DESCA(x) BIT(0 + (x)) 55 #define HSU_CH_DCR_CHSOD(x) BIT(8 + (x)) 56 #define HSU_CH_DCR_CHSOTO BIT(14) 57 #define HSU_CH_DCR_CHSOE BIT(15) 58 #define HSU_CH_DCR_CHDI(x) BIT(16 + (x)) 59 #define HSU_CH_DCR_CHEI BIT(23) 60 #define HSU_CH_DCR_CHTOI(x) BIT(24 + (x)) 61 62 /* Bits in HSU_CH_DxTSR */ 63 #define HSU_CH_DxTSR_MASK GENMASK(15, 0) 64 #define HSU_CH_DxTSR_TSR(x) ((x) & HSU_CH_DxTSR_MASK) 65 66 struct hsu_dma_sg { 67 dma_addr_t addr; 68 unsigned int len; 69 }; 70 71 struct hsu_dma_desc { 72 struct virt_dma_desc vdesc; 73 enum dma_transfer_direction direction; 74 struct hsu_dma_sg *sg; 75 unsigned int nents; 76 size_t length; 77 unsigned int active; 78 enum dma_status status; 79 }; 80 81 static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc) 82 { 83 return container_of(vdesc, struct hsu_dma_desc, vdesc); 84 } 85 86 struct hsu_dma_chan { 87 struct virt_dma_chan vchan; 88 89 void __iomem *reg; 90 91 /* hardware configuration */ 92 enum dma_transfer_direction direction; 93 struct dma_slave_config config; 94 95 struct hsu_dma_desc *desc; 96 }; 97 98 static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan) 99 { 100 return container_of(chan, struct hsu_dma_chan, vchan.chan); 101 } 102 103 static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset) 104 { 105 return readl(hsuc->reg + offset); 106 } 107 108 static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset, 109 u32 value) 110 { 111 writel(value, hsuc->reg + offset); 112 } 113 114 struct hsu_dma { 115 struct dma_device dma; 116 117 /* channels */ 118 struct hsu_dma_chan *chan; 119 unsigned short nr_channels; 120 }; 121 122 static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev) 123 { 124 return container_of(ddev, struct hsu_dma, dma); 125 } 126 127 #endif /* __DMA_HSU_H__ */ 128