drivers/dma/fsldma.h

   1 /*
   2  * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved.
   3  *
   4  * Author:
   5  *   Zhang Wei <wei.zhang@freescale.com>, Jul 2007
   6  *   Ebony Zhu <ebony.zhu@freescale.com>, May 2007
   7  *
   8  * This is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  */
  14 #ifndef __DMA_FSLDMA_H
  15 #define __DMA_FSLDMA_H
  16
  17 #include <linux/device.h>
  18 #include <linux/dmapool.h>
  19 #include <linux/dmaengine.h>
  20
  21 /* Define data structures needed by Freescale
  22  * MPC8540 and MPC8349 DMA controller.
  23  */
  24 #define FSL_DMA_MR_CS           0x00000001
  25 #define FSL_DMA_MR_CC           0x00000002
  26 #define FSL_DMA_MR_CA           0x00000008
  27 #define FSL_DMA_MR_EIE          0x00000040
  28 #define FSL_DMA_MR_XFE          0x00000020
  29 #define FSL_DMA_MR_EOLNIE       0x00000100
  30 #define FSL_DMA_MR_EOLSIE       0x00000080
  31 #define FSL_DMA_MR_EOSIE        0x00000200
  32 #define FSL_DMA_MR_CDSM         0x00000010
  33 #define FSL_DMA_MR_CTM          0x00000004
  34 #define FSL_DMA_MR_EMP_EN       0x00200000
  35 #define FSL_DMA_MR_EMS_EN       0x00040000
  36 #define FSL_DMA_MR_DAHE         0x00002000
  37 #define FSL_DMA_MR_SAHE         0x00001000
  38
  39 /*
  40  * Bandwidth/pause control determines how many bytes a given
  41  * channel is allowed to transfer before the DMA engine pauses
  42  * the current channel and switches to the next channel
  43  */
  44 #define FSL_DMA_MR_BWC         0x08000000
  45
  46 /* Special MR definition for MPC8349 */
  47 #define FSL_DMA_MR_EOTIE        0x00000080
  48 #define FSL_DMA_MR_PRC_RM       0x00000800
  49
  50 #define FSL_DMA_SR_CH           0x00000020
  51 #define FSL_DMA_SR_PE           0x00000010
  52 #define FSL_DMA_SR_CB           0x00000004
  53 #define FSL_DMA_SR_TE           0x00000080
  54 #define FSL_DMA_SR_EOSI         0x00000002
  55 #define FSL_DMA_SR_EOLSI        0x00000001
  56 #define FSL_DMA_SR_EOCDI        0x00000001
  57 #define FSL_DMA_SR_EOLNI        0x00000008
  58
  59 #define FSL_DMA_SATR_SBPATMU                    0x20000000
  60 #define FSL_DMA_SATR_STRANSINT_RIO              0x00c00000
  61 #define FSL_DMA_SATR_SREADTYPE_SNOOP_READ       0x00050000
  62 #define FSL_DMA_SATR_SREADTYPE_BP_IORH          0x00020000
  63 #define FSL_DMA_SATR_SREADTYPE_BP_NREAD         0x00040000
  64 #define FSL_DMA_SATR_SREADTYPE_BP_MREAD         0x00070000
  65
  66 #define FSL_DMA_DATR_DBPATMU                    0x20000000
  67 #define FSL_DMA_DATR_DTRANSINT_RIO              0x00c00000
  68 #define FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE     0x00050000
  69 #define FSL_DMA_DATR_DWRITETYPE_BP_FLUSH        0x00010000
  70
  71 #define FSL_DMA_EOL             ((u64)0x1)
  72 #define FSL_DMA_SNEN            ((u64)0x10)
  73 #define FSL_DMA_EOSIE           0x8
  74 #define FSL_DMA_NLDA_MASK       (~(u64)0x1f)
  75
  76 #define FSL_DMA_BCR_MAX_CNT     0x03ffffffu
  77
  78 #define FSL_DMA_DGSR_TE         0x80
  79 #define FSL_DMA_DGSR_CH         0x20
  80 #define FSL_DMA_DGSR_PE         0x10
  81 #define FSL_DMA_DGSR_EOLNI      0x08
  82 #define FSL_DMA_DGSR_CB         0x04
  83 #define FSL_DMA_DGSR_EOSI       0x02
  84 #define FSL_DMA_DGSR_EOLSI      0x01
  85
  86 typedef u64 __bitwise v64;
  87 typedef u32 __bitwise v32;
  88
  89 struct fsl_dma_ld_hw {
  90         v64 src_addr;
  91         v64 dst_addr;
  92         v64 next_ln_addr;
  93         v32 count;
  94         v32 reserve;
  95 } __attribute__((aligned(32)));
  96
  97 struct fsl_desc_sw {
  98         struct fsl_dma_ld_hw hw;
  99         struct list_head node;
 100         struct list_head tx_list;
 101         struct dma_async_tx_descriptor async_tx;
 102 } __attribute__((aligned(32)));
 103
 104 struct fsldma_chan_regs {
 105         u32 mr;         /* 0x00 - Mode Register */
 106         u32 sr;         /* 0x04 - Status Register */
 107         u64 cdar;       /* 0x08 - Current descriptor address register */
 108         u64 sar;        /* 0x10 - Source Address Register */
 109         u64 dar;        /* 0x18 - Destination Address Register */
 110         u32 bcr;        /* 0x20 - Byte Count Register */
 111         u64 ndar;       /* 0x24 - Next Descriptor Address Register */
 112 };
 113
 114 struct fsldma_chan;
 115 #define FSL_DMA_MAX_CHANS_PER_DEVICE 4
 116
 117 struct fsldma_device {
 118         void __iomem *regs;     /* DGSR register base */
 119         struct device *dev;
 120         struct dma_device common;
 121         struct fsldma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE];
 122         u32 feature;            /* The same as DMA channels */
 123         int irq;                /* Channel IRQ */
 124 };
 125
 126 /* Define macros for fsldma_chan->feature property */
 127 #define FSL_DMA_LITTLE_ENDIAN   0x00000000
 128 #define FSL_DMA_BIG_ENDIAN      0x00000001
 129
 130 #define FSL_DMA_IP_MASK         0x00000ff0
 131 #define FSL_DMA_IP_85XX         0x00000010
 132 #define FSL_DMA_IP_83XX         0x00000020
 133
 134 #define FSL_DMA_CHAN_PAUSE_EXT  0x00001000
 135 #define FSL_DMA_CHAN_START_EXT  0x00002000
 136
 137 struct fsldma_chan {
 138         char name[8];                   /* Channel name */
 139         struct fsldma_chan_regs __iomem *regs;
 140         spinlock_t desc_lock;           /* Descriptor operation lock */
 141         struct list_head ld_pending;    /* Link descriptors queue */
 142         struct list_head ld_running;    /* Link descriptors queue */
 143         struct dma_chan common;         /* DMA common channel */
 144         struct dma_pool *desc_pool;     /* Descriptors pool */
 145         struct device *dev;             /* Channel device */
 146         int irq;                        /* Channel IRQ */
 147         int id;                         /* Raw id of this channel */
 148         struct tasklet_struct tasklet;
 149         u32 feature;
 150         bool idle;                      /* DMA controller is idle */
 151
 152         void (*toggle_ext_pause)(struct fsldma_chan *fsl_chan, int enable);
 153         void (*toggle_ext_start)(struct fsldma_chan *fsl_chan, int enable);
 154         void (*set_src_loop_size)(struct fsldma_chan *fsl_chan, int size);
 155         void (*set_dst_loop_size)(struct fsldma_chan *fsl_chan, int size);
 156         void (*set_request_count)(struct fsldma_chan *fsl_chan, int size);
 157 };
 158
 159 #define to_fsl_chan(chan) container_of(chan, struct fsldma_chan, common)
 160 #define to_fsl_desc(lh) container_of(lh, struct fsl_desc_sw, node)
 161 #define tx_to_fsl_desc(tx) container_of(tx, struct fsl_desc_sw, async_tx)
 162
 163 #ifndef __powerpc64__
 164 static u64 in_be64(const u64 __iomem *addr)
 165 {
 166         return ((u64)in_be32((u32 __iomem *)addr) << 32) |
 167                 (in_be32((u32 __iomem *)addr + 1));
 168 }
 169
 170 static void out_be64(u64 __iomem *addr, u64 val)
 171 {
 172         out_be32((u32 __iomem *)addr, val >> 32);
 173         out_be32((u32 __iomem *)addr + 1, (u32)val);
 174 }
 175
 176 /* There is no asm instructions for 64 bits reverse loads and stores */
 177 static u64 in_le64(const u64 __iomem *addr)
 178 {
 179         return ((u64)in_le32((u32 __iomem *)addr + 1) << 32) |
 180                 (in_le32((u32 __iomem *)addr));
 181 }
 182
 183 static void out_le64(u64 __iomem *addr, u64 val)
 184 {
 185         out_le32((u32 __iomem *)addr + 1, val >> 32);
 186         out_le32((u32 __iomem *)addr, (u32)val);
 187 }
 188 #endif
 189
 190 #define DMA_IN(fsl_chan, addr, width)                                   \
 191                 (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?           \
 192                         in_be##width(addr) : in_le##width(addr))
 193 #define DMA_OUT(fsl_chan, addr, val, width)                             \
 194                 (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?           \
 195                         out_be##width(addr, val) : out_le##width(addr, val))
 196
 197 #define DMA_TO_CPU(fsl_chan, d, width)                                  \
 198                 (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?           \
 199                         be##width##_to_cpu((__force __be##width)(v##width)d) : \
 200                         le##width##_to_cpu((__force __le##width)(v##width)d))
 201 #define CPU_TO_DMA(fsl_chan, c, width)                                  \
 202                 (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?           \
 203                         (__force v##width)cpu_to_be##width(c) :         \
 204                         (__force v##width)cpu_to_le##width(c))
 205
 206 #endif  /* __DMA_FSLDMA_H */