drivers/dma/mv_xor.h

   1 /*
   2  * Copyright (C) 2007, 2008, Marvell International Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef MV_XOR_H
  19 #define MV_XOR_H
  20
  21 #include <linux/types.h>
  22 #include <linux/io.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/interrupt.h>
  25
  26 #define MV_XOR_POOL_SIZE                PAGE_SIZE
  27 #define MV_XOR_SLOT_SIZE                64
  28 #define MV_XOR_THRESHOLD                1
  29 #define MV_XOR_MAX_CHANNELS             2
  30
  31 #define MV_XOR_MIN_BYTE_COUNT           SZ_128
  32 #define MV_XOR_MAX_BYTE_COUNT           (SZ_16M - 1)
  33
  34 /* Values for the XOR_CONFIG register */
  35 #define XOR_OPERATION_MODE_XOR          0
  36 #define XOR_OPERATION_MODE_MEMCPY       2
  37 #define XOR_DESCRIPTOR_SWAP             BIT(14)
  38 #define XOR_DESC_SUCCESS                0x40000000
  39
  40 #define XOR_DESC_DMA_OWNED              BIT(31)
  41 #define XOR_DESC_EOD_INT_EN             BIT(31)
  42
  43 #define XOR_CURR_DESC(chan)     (chan->mmr_high_base + 0x10 + (chan->idx * 4))
  44 #define XOR_NEXT_DESC(chan)     (chan->mmr_high_base + 0x00 + (chan->idx * 4))
  45 #define XOR_BYTE_COUNT(chan)    (chan->mmr_high_base + 0x20 + (chan->idx * 4))
  46 #define XOR_DEST_POINTER(chan)  (chan->mmr_high_base + 0xB0 + (chan->idx * 4))
  47 #define XOR_BLOCK_SIZE(chan)    (chan->mmr_high_base + 0xC0 + (chan->idx * 4))
  48 #define XOR_INIT_VALUE_LOW(chan)        (chan->mmr_high_base + 0xE0)
  49 #define XOR_INIT_VALUE_HIGH(chan)       (chan->mmr_high_base + 0xE4)
  50
  51 #define XOR_CONFIG(chan)        (chan->mmr_base + 0x10 + (chan->idx * 4))
  52 #define XOR_ACTIVATION(chan)    (chan->mmr_base + 0x20 + (chan->idx * 4))
  53 #define XOR_INTR_CAUSE(chan)    (chan->mmr_base + 0x30)
  54 #define XOR_INTR_MASK(chan)     (chan->mmr_base + 0x40)
  55 #define XOR_ERROR_CAUSE(chan)   (chan->mmr_base + 0x50)
  56 #define XOR_ERROR_ADDR(chan)    (chan->mmr_base + 0x60)
  57
  58 #define XOR_INT_END_OF_DESC     BIT(0)
  59 #define XOR_INT_END_OF_CHAIN    BIT(1)
  60 #define XOR_INT_STOPPED         BIT(2)
  61 #define XOR_INT_PAUSED          BIT(3)
  62 #define XOR_INT_ERR_DECODE      BIT(4)
  63 #define XOR_INT_ERR_RDPROT      BIT(5)
  64 #define XOR_INT_ERR_WRPROT      BIT(6)
  65 #define XOR_INT_ERR_OWN         BIT(7)
  66 #define XOR_INT_ERR_PAR         BIT(8)
  67 #define XOR_INT_ERR_MBUS        BIT(9)
  68
  69 #define XOR_INTR_ERRORS         (XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \
  70                                  XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN    | \
  71                                  XOR_INT_ERR_PAR    | XOR_INT_ERR_MBUS)
  72
  73 #define XOR_INTR_MASK_VALUE     (XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \
  74                                  XOR_INT_STOPPED     | XOR_INTR_ERRORS)
  75
  76 #define WINDOW_BASE(w)          (0x50 + ((w) << 2))
  77 #define WINDOW_SIZE(w)          (0x70 + ((w) << 2))
  78 #define WINDOW_REMAP_HIGH(w)    (0x90 + ((w) << 2))
  79 #define WINDOW_BAR_ENABLE(chan) (0x40 + ((chan) << 2))
  80 #define WINDOW_OVERRIDE_CTRL(chan)      (0xA0 + ((chan) << 2))
  81
  82 struct mv_xor_device {
  83         void __iomem         *xor_base;
  84         void __iomem         *xor_high_base;
  85         struct clk           *clk;
  86         struct mv_xor_chan   *channels[MV_XOR_MAX_CHANNELS];
  87 };
  88
  89 /**
  90  * struct mv_xor_chan - internal representation of a XOR channel
  91  * @pending: allows batching of hardware operations
  92  * @lock: serializes enqueue/dequeue operations to the descriptors pool
  93  * @mmr_base: memory mapped register base
  94  * @idx: the index of the xor channel
  95  * @chain: device chain view of the descriptors
  96  * @completed_slots: slots completed by HW but still need to be acked
  97  * @device: parent device
  98  * @common: common dmaengine channel object members
  99  * @last_used: place holder for allocation to continue from where it left off
 100  * @all_slots: complete domain of slots usable by the channel
 101  * @slots_allocated: records the actual size of the descriptor slot pool
 102  * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs
 103  */
 104 struct mv_xor_chan {
 105         int                     pending;
 106         spinlock_t              lock; /* protects the descriptor slot pool */
 107         void __iomem            *mmr_base;
 108         void __iomem            *mmr_high_base;
 109         unsigned int            idx;
 110         int                     irq;
 111         enum dma_transaction_type       current_type;
 112         struct list_head        chain;
 113         struct list_head        completed_slots;
 114         dma_addr_t              dma_desc_pool;
 115         void                    *dma_desc_pool_virt;
 116         size_t                  pool_size;
 117         struct dma_device       dmadev;
 118         struct dma_chan         dmachan;
 119         struct mv_xor_desc_slot *last_used;
 120         struct list_head        all_slots;
 121         int                     slots_allocated;
 122         struct tasklet_struct   irq_tasklet;
 123         char                    dummy_src[MV_XOR_MIN_BYTE_COUNT];
 124         char                    dummy_dst[MV_XOR_MIN_BYTE_COUNT];
 125         dma_addr_t              dummy_src_addr, dummy_dst_addr;
 126 };
 127
 128 /**
 129  * struct mv_xor_desc_slot - software descriptor
 130  * @slot_node: node on the mv_xor_chan.all_slots list
 131  * @chain_node: node on the mv_xor_chan.chain list
 132  * @completed_node: node on the mv_xor_chan.completed_slots list
 133  * @hw_desc: virtual address of the hardware descriptor chain
 134  * @phys: hardware address of the hardware descriptor chain
 135  * @slot_used: slot in use or not
 136  * @idx: pool index
 137  * @tx_list: list of slots that make up a multi-descriptor transaction
 138  * @async_tx: support for the async_tx api
 139  */
 140 struct mv_xor_desc_slot {
 141         struct list_head        slot_node;
 142         struct list_head        chain_node;
 143         struct list_head        completed_node;
 144         enum dma_transaction_type       type;
 145         void                    *hw_desc;
 146         u16                     slot_used;
 147         u16                     idx;
 148         struct dma_async_tx_descriptor  async_tx;
 149 };
 150
 151 /*
 152  * This structure describes XOR descriptor size 64bytes. The
 153  * mv_phy_src_idx() macro must be used when indexing the values of the
 154  * phy_src_addr[] array. This is due to the fact that the 'descriptor
 155  * swap' feature, used on big endian systems, swaps descriptors data
 156  * within blocks of 8 bytes. So two consecutive values of the
 157  * phy_src_addr[] array are actually swapped in big-endian, which
 158  * explains the different mv_phy_src_idx() implementation.
 159  */
 160 #if defined(__LITTLE_ENDIAN)
 161 struct mv_xor_desc {
 162         u32 status;             /* descriptor execution status */
 163         u32 crc32_result;       /* result of CRC-32 calculation */
 164         u32 desc_command;       /* type of operation to be carried out */
 165         u32 phy_next_desc;      /* next descriptor address pointer */
 166         u32 byte_count;         /* size of src/dst blocks in bytes */
 167         u32 phy_dest_addr;      /* destination block address */
 168         u32 phy_src_addr[8];    /* source block addresses */
 169         u32 reserved0;
 170         u32 reserved1;
 171 };
 172 #define mv_phy_src_idx(src_idx) (src_idx)
 173 #else
 174 struct mv_xor_desc {
 175         u32 crc32_result;       /* result of CRC-32 calculation */
 176         u32 status;             /* descriptor execution status */
 177         u32 phy_next_desc;      /* next descriptor address pointer */
 178         u32 desc_command;       /* type of operation to be carried out */
 179         u32 phy_dest_addr;      /* destination block address */
 180         u32 byte_count;         /* size of src/dst blocks in bytes */
 181         u32 phy_src_addr[8];    /* source block addresses */
 182         u32 reserved1;
 183         u32 reserved0;
 184 };
 185 #define mv_phy_src_idx(src_idx) (src_idx ^ 1)
 186 #endif
 187
 188 #define to_mv_sw_desc(addr_hw_desc)             \
 189         container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc)
 190
 191 #define mv_hw_desc_slot_idx(hw_desc, idx)       \
 192         ((void *)(((unsigned long)hw_desc) + ((idx) << 5)))
 193
 194 #endif