kernel/drivers/dma/hsu/hsu.h

   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__ */