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