arch/arm/mach-tegra/include/mach/dma.h

   1 /*
   2  * arch/arm/mach-tegra/include/mach/dma.h
   3  *
   4  * Copyright (c) 2008-2009, NVIDIA Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20
  21 #ifndef __MACH_TEGRA_DMA_H
  22 #define __MACH_TEGRA_DMA_H
  23
  24 #include <linux/list.h>
  25
  26 #if defined(CONFIG_TEGRA_SYSTEM_DMA)
  27
  28 struct tegra_dma_req;
  29 struct tegra_dma_channel;
  30
  31 #define TEGRA_DMA_REQ_SEL_CNTR                  0
  32 #define TEGRA_DMA_REQ_SEL_I2S_2                 1
  33 #define TEGRA_DMA_REQ_SEL_I2S_1                 2
  34 #define TEGRA_DMA_REQ_SEL_SPD_I                 3
  35 #define TEGRA_DMA_REQ_SEL_UI_I                  4
  36 #define TEGRA_DMA_REQ_SEL_MIPI                  5
  37 #define TEGRA_DMA_REQ_SEL_I2S2_2                6
  38 #define TEGRA_DMA_REQ_SEL_I2S2_1                7
  39 #define TEGRA_DMA_REQ_SEL_UARTA                 8
  40 #define TEGRA_DMA_REQ_SEL_UARTB                 9
  41 #define TEGRA_DMA_REQ_SEL_UARTC                 10
  42 #define TEGRA_DMA_REQ_SEL_SPI                   11
  43 #define TEGRA_DMA_REQ_SEL_AC97                  12
  44 #define TEGRA_DMA_REQ_SEL_ACMODEM               13
  45 #define TEGRA_DMA_REQ_SEL_SL4B                  14
  46 #define TEGRA_DMA_REQ_SEL_SL2B1                 15
  47 #define TEGRA_DMA_REQ_SEL_SL2B2                 16
  48 #define TEGRA_DMA_REQ_SEL_SL2B3                 17
  49 #define TEGRA_DMA_REQ_SEL_SL2B4                 18
  50 #define TEGRA_DMA_REQ_SEL_UARTD                 19
  51 #define TEGRA_DMA_REQ_SEL_UARTE                 20
  52 #define TEGRA_DMA_REQ_SEL_I2C                   21
  53 #define TEGRA_DMA_REQ_SEL_I2C2                  22
  54 #define TEGRA_DMA_REQ_SEL_I2C3                  23
  55 #define TEGRA_DMA_REQ_SEL_DVC_I2C               24
  56 #define TEGRA_DMA_REQ_SEL_OWR                   25
  57 #define TEGRA_DMA_REQ_SEL_INVALID               31
  58
  59 enum tegra_dma_mode {
  60         TEGRA_DMA_SHARED = 1,
  61         TEGRA_DMA_MODE_CONTINOUS = 2,
  62         TEGRA_DMA_MODE_ONESHOT = 4,
  63 };
  64
  65 enum tegra_dma_req_error {
  66         TEGRA_DMA_REQ_SUCCESS = 0,
  67         TEGRA_DMA_REQ_ERROR_ABORTED,
  68         TEGRA_DMA_REQ_INFLIGHT,
  69 };
  70
  71 enum tegra_dma_req_buff_status {
  72         TEGRA_DMA_REQ_BUF_STATUS_EMPTY = 0,
  73         TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL,
  74         TEGRA_DMA_REQ_BUF_STATUS_FULL,
  75 };
  76
  77 struct tegra_dma_req {
  78         struct list_head node;
  79         unsigned int modid;
  80         int instance;
  81
  82         /* Called when the req is complete and from the DMA ISR context.
  83          * When this is called the req structure is no longer queued by
  84          * the DMA channel.
  85          *
  86          * State of the DMA depends on the number of req it has. If there are
  87          * no DMA requests queued up, then it will STOP the DMA. It there are
  88          * more requests in the DMA, then it will queue the next request.
  89          */
  90         void (*complete)(struct tegra_dma_req *req);
  91
  92         /*  This is a called from the DMA ISR context when the DMA is still in
  93          *  progress and is actively filling same buffer.
  94          *
  95          *  In case of continuous mode receive, this threshold is 1/2 the buffer
  96          *  size. In other cases, this will not even be called as there is no
  97          *  hardware support for it.
  98          *
  99          * In the case of continuous mode receive, if there is next req already
 100          * queued, DMA programs the HW to use that req when this req is
 101          * completed. If there is no "next req" queued, then DMA ISR doesn't do
 102          * anything before calling this callback.
 103          *
 104          *      This is mainly used by the cases, where the clients has queued
 105          *      only one req and want to get some sort of DMA threshold
 106          *      callback to program the next buffer.
 107          *
 108          */
 109         void (*threshold)(struct tegra_dma_req *req);
 110
 111         /* 1 to copy to memory.
 112          * 0 to copy from the memory to device FIFO */
 113         int to_memory;
 114
 115         void *virt_addr;
 116
 117         unsigned long source_addr;
 118         unsigned long dest_addr;
 119         unsigned long dest_wrap;
 120         unsigned long source_wrap;
 121         unsigned long source_bus_width;
 122         unsigned long dest_bus_width;
 123         unsigned long req_sel;
 124         unsigned int size;
 125
 126         /* Updated by the DMA driver on the conpletion of the request. */
 127         int bytes_transferred;
 128         int status;
 129
 130         /* DMA completion tracking information */
 131         int buffer_status;
 132
 133         /* Client specific data */
 134         void *dev;
 135 };
 136
 137 int tegra_dma_enqueue_req(struct tegra_dma_channel *ch,
 138         struct tegra_dma_req *req);
 139 int tegra_dma_dequeue_req(struct tegra_dma_channel *ch,
 140         struct tegra_dma_req *req);
 141 void tegra_dma_dequeue(struct tegra_dma_channel *ch);
 142 void tegra_dma_flush(struct tegra_dma_channel *ch);
 143
 144 bool tegra_dma_is_req_inflight(struct tegra_dma_channel *ch,
 145         struct tegra_dma_req *req);
 146 bool tegra_dma_is_empty(struct tegra_dma_channel *ch);
 147
 148 struct tegra_dma_channel *tegra_dma_allocate_channel(int mode);
 149 void tegra_dma_free_channel(struct tegra_dma_channel *ch);
 150
 151 int __init tegra_dma_init(void);
 152
 153 #endif
 154
 155 #endif