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
  14 #ifndef MV_XOR_H
  15 #define MV_XOR_H
  16
  17 #include <linux/types.h>
  18 #include <linux/io.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/interrupt.h>
  21
  22 #define MV_XOR_POOL_SIZE                (MV_XOR_SLOT_SIZE * 3072)
  23 #define MV_XOR_SLOT_SIZE                64
  24 #define MV_XOR_THRESHOLD                1
  25 #define MV_XOR_MAX_CHANNELS             2
  26
  27 #define MV_XOR_MIN_BYTE_COUNT           SZ_128
  28 #define MV_XOR_MAX_BYTE_COUNT           (SZ_16M - 1)
  29
  30 /* Values for the XOR_CONFIG register */
  31 #define XOR_OPERATION_MODE_XOR          0
  32 #define XOR_OPERATION_MODE_MEMCPY       2
  33 #define XOR_OPERATION_MODE_IN_DESC      7
  34 #define XOR_DESCRIPTOR_SWAP             BIT(14)
  35 #define XOR_DESC_SUCCESS                0x40000000
  36
  37 #define XOR_DESC_OPERATION_XOR          (0 << 24)
  38 #define XOR_DESC_OPERATION_CRC32C       (1 << 24)
  39 #define XOR_DESC_OPERATION_MEMCPY       (2 << 24)
  40
  41 #define XOR_DESC_DMA_OWNED              BIT(31)
  42 #define XOR_DESC_EOD_INT_EN             BIT(31)
  43
  44 #define XOR_CURR_DESC(chan)     (chan->mmr_high_base + 0x10 + (chan->idx * 4))
  45 #define XOR_NEXT_DESC(chan)     (chan->mmr_high_base + 0x00 + (chan->idx * 4))
  46 #define XOR_BYTE_COUNT(chan)    (chan->mmr_high_base + 0x20 + (chan->idx * 4))
  47 #define XOR_DEST_POINTER(chan)  (chan->mmr_high_base + 0xB0 + (chan->idx * 4))
  48 #define XOR_BLOCK_SIZE(chan)    (chan->mmr_high_base + 0xC0 + (chan->idx * 4))
  49 #define XOR_INIT_VALUE_LOW(chan)        (chan->mmr_high_base + 0xE0)
  50 #define XOR_INIT_VALUE_HIGH(chan)       (chan->mmr_high_base + 0xE4)
  51
  52 #define XOR_CONFIG(chan)        (chan->mmr_base + 0x10 + (chan->idx * 4))
  53 #define XOR_ACTIVATION(chan)    (chan->mmr_base + 0x20 + (chan->idx * 4))
  54 #define XOR_INTR_CAUSE(chan)    (chan->mmr_base + 0x30)
  55 #define XOR_INTR_MASK(chan)     (chan->mmr_base + 0x40)
  56 #define XOR_ERROR_CAUSE(chan)   (chan->mmr_base + 0x50)
  57 #define XOR_ERROR_ADDR(chan)    (chan->mmr_base + 0x60)
  58
  59 #define XOR_INT_END_OF_DESC     BIT(0)
  60 #define XOR_INT_END_OF_CHAIN    BIT(1)
  61 #define XOR_INT_STOPPED         BIT(2)
  62 #define XOR_INT_PAUSED          BIT(3)
  63 #define XOR_INT_ERR_DECODE      BIT(4)
  64 #define XOR_INT_ERR_RDPROT      BIT(5)
  65 #define XOR_INT_ERR_WRPROT      BIT(6)
  66 #define XOR_INT_ERR_OWN         BIT(7)
  67 #define XOR_INT_ERR_PAR         BIT(8)
  68 #define XOR_INT_ERR_MBUS        BIT(9)
  69
  70 #define XOR_INTR_ERRORS         (XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \
  71                                  XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN    | \
  72                                  XOR_INT_ERR_PAR    | XOR_INT_ERR_MBUS)
  73
  74 #define XOR_INTR_MASK_VALUE     (XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \
  75                                  XOR_INT_STOPPED     | XOR_INTR_ERRORS)
  76
  77 #define WINDOW_BASE(w)          (0x50 + ((w) << 2))
  78 #define WINDOW_SIZE(w)          (0x70 + ((w) << 2))
  79 #define WINDOW_REMAP_HIGH(w)    (0x90 + ((w) << 2))
  80 #define WINDOW_BAR_ENABLE(chan) (0x40 + ((chan) << 2))
  81 #define WINDOW_OVERRIDE_CTRL(chan)      (0xA0 + ((chan) << 2))
  82
  83 #define WINDOW_COUNT            8
  84
  85 struct mv_xor_device {
  86         void __iomem         *xor_base;
  87         void __iomem         *xor_high_base;
  88         struct clk           *clk;
  89         struct mv_xor_chan   *channels[MV_XOR_MAX_CHANNELS];
  90         int                  xor_type;
  91
  92         u32                  win_start[WINDOW_COUNT];
  93         u32                  win_end[WINDOW_COUNT];
  94 };
  95
  96 /**
  97  * struct mv_xor_chan - internal representation of a XOR channel
  98  * @pending: allows batching of hardware operations
  99  * @lock: serializes enqueue/dequeue operations to the descriptors pool
 100  * @mmr_base: memory mapped register base
 101  * @idx: the index of the xor channel
 102  * @chain: device chain view of the descriptors
 103  * @free_slots: free slots usable by the channel
 104  * @allocated_slots: slots allocated by the driver
 105  * @completed_slots: slots completed by HW but still need to be acked
 106  * @device: parent device
 107  * @common: common dmaengine channel object members
 108  * @slots_allocated: records the actual size of the descriptor slot pool
 109  * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs
 110  * @op_in_desc: new mode of driver, each op is writen to descriptor.
 111  */
 112 struct mv_xor_chan {
 113         int                     pending;
 114         spinlock_t              lock; /* protects the descriptor slot pool */
 115         void __iomem            *mmr_base;
 116         void __iomem            *mmr_high_base;
 117         unsigned int            idx;
 118         int                     irq;
 119         struct list_head        chain;
 120         struct list_head        free_slots;
 121         struct list_head        allocated_slots;
 122         struct list_head        completed_slots;
 123         dma_addr_t              dma_desc_pool;
 124         void                    *dma_desc_pool_virt;
 125         size_t                  pool_size;
 126         struct dma_device       dmadev;
 127         struct dma_chan         dmachan;
 128         int                     slots_allocated;
 129         struct tasklet_struct   irq_tasklet;
 130         int                     op_in_desc;
 131         char                    dummy_src[MV_XOR_MIN_BYTE_COUNT];
 132         char                    dummy_dst[MV_XOR_MIN_BYTE_COUNT];
 133         dma_addr_t              dummy_src_addr, dummy_dst_addr;
 134         u32                     saved_config_reg, saved_int_mask_reg;
 135
 136         struct mv_xor_device    *xordev;
 137 };
 138
 139 /**
 140  * struct mv_xor_desc_slot - software descriptor
 141  * @node: node on the mv_xor_chan lists
 142  * @hw_desc: virtual address of the hardware descriptor chain
 143  * @phys: hardware address of the hardware descriptor chain
 144  * @slot_used: slot in use or not
 145  * @idx: pool index
 146  * @tx_list: list of slots that make up a multi-descriptor transaction
 147  * @async_tx: support for the async_tx api
 148  */
 149 struct mv_xor_desc_slot {
 150         struct list_head        node;
 151         struct list_head        sg_tx_list;
 152         enum dma_transaction_type       type;
 153         void                    *hw_desc;
 154         u16                     idx;
 155         struct dma_async_tx_descriptor  async_tx;
 156 };
 157
 158 /*
 159  * This structure describes XOR descriptor size 64bytes. The
 160  * mv_phy_src_idx() macro must be used when indexing the values of the
 161  * phy_src_addr[] array. This is due to the fact that the 'descriptor
 162  * swap' feature, used on big endian systems, swaps descriptors data
 163  * within blocks of 8 bytes. So two consecutive values of the
 164  * phy_src_addr[] array are actually swapped in big-endian, which
 165  * explains the different mv_phy_src_idx() implementation.
 166  */
 167 #if defined(__LITTLE_ENDIAN)
 168 struct mv_xor_desc {
 169         u32 status;             /* descriptor execution status */
 170         u32 crc32_result;       /* result of CRC-32 calculation */
 171         u32 desc_command;       /* type of operation to be carried out */
 172         u32 phy_next_desc;      /* next descriptor address pointer */
 173         u32 byte_count;         /* size of src/dst blocks in bytes */
 174         u32 phy_dest_addr;      /* destination block address */
 175         u32 phy_src_addr[8];    /* source block addresses */
 176         u32 reserved0;
 177         u32 reserved1;
 178 };
 179 #define mv_phy_src_idx(src_idx) (src_idx)
 180 #else
 181 struct mv_xor_desc {
 182         u32 crc32_result;       /* result of CRC-32 calculation */
 183         u32 status;             /* descriptor execution status */
 184         u32 phy_next_desc;      /* next descriptor address pointer */
 185         u32 desc_command;       /* type of operation to be carried out */
 186         u32 phy_dest_addr;      /* destination block address */
 187         u32 byte_count;         /* size of src/dst blocks in bytes */
 188         u32 phy_src_addr[8];    /* source block addresses */
 189         u32 reserved1;
 190         u32 reserved0;
 191 };
 192 #define mv_phy_src_idx(src_idx) (src_idx ^ 1)
 193 #endif
 194
 195 #define to_mv_sw_desc(addr_hw_desc)             \
 196         container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc)
 197
 198 #define mv_hw_desc_slot_idx(hw_desc, idx)       \
 199         ((void *)(((unsigned long)hw_desc) + ((idx) << 5)))
 200
 201 #endif