drivers/dma/ppc4xx/adma.h

   1 /*
   2  * 2006-2009 (C) DENX Software Engineering.
   3  *
   4  * Author: Yuri Tikhonov <yur@emcraft.com>
   5  *
   6  * This file is licensed under the terms of the GNU General Public License
   7  * version 2.  This program is licensed "as is" without any warranty of
   8  * any kind, whether express or implied.
   9  */
  10
  11 #ifndef _PPC440SPE_ADMA_H
  12 #define _PPC440SPE_ADMA_H
  13
  14 #include <linux/types.h>
  15 #include "dma.h"
  16 #include "xor.h"
  17
  18 #define to_ppc440spe_adma_chan(chan) \
  19                 container_of(chan, struct ppc440spe_adma_chan, common)
  20 #define to_ppc440spe_adma_device(dev) \
  21                 container_of(dev, struct ppc440spe_adma_device, common)
  22 #define tx_to_ppc440spe_adma_slot(tx) \
  23                 container_of(tx, struct ppc440spe_adma_desc_slot, async_tx)
  24
  25 /* Default polynomial (for 440SP is only available) */
  26 #define PPC440SPE_DEFAULT_POLY  0x4d
  27
  28 #define PPC440SPE_ADMA_ENGINES_NUM      (XOR_ENGINES_NUM + DMA_ENGINES_NUM)
  29
  30 #define PPC440SPE_ADMA_WATCHDOG_MSEC    3
  31 #define PPC440SPE_ADMA_THRESHOLD        1
  32
  33 #define PPC440SPE_DMA0_ID       0
  34 #define PPC440SPE_DMA1_ID       1
  35 #define PPC440SPE_XOR_ID        2
  36
  37 #define PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT       0xFFFFFFUL
  38 /* this is the XOR_CBBCR width */
  39 #define PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT       (1 << 31)
  40 #define PPC440SPE_ADMA_ZERO_SUM_MAX_BYTE_COUNT PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT
  41
  42 #define PPC440SPE_RXOR_RUN      0
  43
  44 #define MQ0_CF2H_RXOR_BS_MASK   0x1FF
  45
  46 #undef ADMA_LL_DEBUG
  47
  48 /**
  49  * struct ppc440spe_adma_device - internal representation of an ADMA device
  50  * @dev: device
  51  * @dma_reg: base for DMAx register access
  52  * @xor_reg: base for XOR register access
  53  * @i2o_reg: base for I2O register access
  54  * @id: HW ADMA Device selector
  55  * @dma_desc_pool_virt: base of DMA descriptor region (CPU address)
  56  * @dma_desc_pool: base of DMA descriptor region (DMA address)
  57  * @pool_size: size of the pool
  58  * @irq: DMAx or XOR irq number
  59  * @err_irq: DMAx error irq number
  60  * @common: embedded struct dma_device
  61  */
  62 struct ppc440spe_adma_device {
  63         struct device *dev;
  64         struct dma_regs __iomem *dma_reg;
  65         struct xor_regs __iomem *xor_reg;
  66         struct i2o_regs __iomem *i2o_reg;
  67         int id;
  68         void *dma_desc_pool_virt;
  69         dma_addr_t dma_desc_pool;
  70         size_t pool_size;
  71         int irq;
  72         int err_irq;
  73         struct dma_device common;
  74 };
  75
  76 /**
  77  * struct ppc440spe_adma_chan - internal representation of an ADMA channel
  78  * @lock: serializes enqueue/dequeue operations to the slot pool
  79  * @device: parent device
  80  * @chain: device chain view of the descriptors
  81  * @common: common dmaengine channel object members
  82  * @all_slots: complete domain of slots usable by the channel
  83  * @pending: allows batching of hardware operations
  84  * @slots_allocated: records the actual size of the descriptor slot pool
  85  * @hw_chain_inited: h/w descriptor chain initialization flag
  86  * @irq_tasklet: bottom half where ppc440spe_adma_slot_cleanup runs
  87  * @needs_unmap: if buffers should not be unmapped upon final processing
  88  * @pdest_page: P destination page for async validate operation
  89  * @qdest_page: Q destination page for async validate operation
  90  * @pdest: P dma addr for async validate operation
  91  * @qdest: Q dma addr for async validate operation
  92  */
  93 struct ppc440spe_adma_chan {
  94         spinlock_t lock;
  95         struct ppc440spe_adma_device *device;
  96         struct list_head chain;
  97         struct dma_chan common;
  98         struct list_head all_slots;
  99         struct ppc440spe_adma_desc_slot *last_used;
 100         int pending;
 101         int slots_allocated;
 102         int hw_chain_inited;
 103         struct tasklet_struct irq_tasklet;
 104         u8 needs_unmap;
 105         struct page *pdest_page;
 106         struct page *qdest_page;
 107         dma_addr_t pdest;
 108         dma_addr_t qdest;
 109 };
 110
 111 struct ppc440spe_rxor {
 112         u32 addrl;
 113         u32 addrh;
 114         int len;
 115         int xor_count;
 116         int addr_count;
 117         int desc_count;
 118         int state;
 119 };
 120
 121 /**
 122  * struct ppc440spe_adma_desc_slot - PPC440SPE-ADMA software descriptor
 123  * @phys: hardware address of the hardware descriptor chain
 124  * @group_head: first operation in a transaction
 125  * @hw_next: pointer to the next descriptor in chain
 126  * @async_tx: support for the async_tx api
 127  * @slot_node: node on the iop_adma_chan.all_slots list
 128  * @chain_node: node on the op_adma_chan.chain list
 129  * @group_list: list of slots that make up a multi-descriptor transaction
 130  *              for example transfer lengths larger than the supported hw max
 131  * @unmap_len: transaction bytecount
 132  * @hw_desc: virtual address of the hardware descriptor chain
 133  * @stride: currently chained or not
 134  * @idx: pool index
 135  * @slot_cnt: total slots used in an transaction (group of operations)
 136  * @src_cnt: number of sources set in this descriptor
 137  * @dst_cnt: number of destinations set in the descriptor
 138  * @slots_per_op: number of slots per operation
 139  * @descs_per_op: number of slot per P/Q operation see comment
 140  *                for ppc440spe_prep_dma_pqxor function
 141  * @flags: desc state/type
 142  * @reverse_flags: 1 if a corresponding rxor address uses reversed address order
 143  * @xor_check_result: result of zero sum
 144  * @crc32_result: result crc calculation
 145  */
 146 struct ppc440spe_adma_desc_slot {
 147         dma_addr_t phys;
 148         struct ppc440spe_adma_desc_slot *group_head;
 149         struct ppc440spe_adma_desc_slot *hw_next;
 150         struct dma_async_tx_descriptor async_tx;
 151         struct list_head slot_node;
 152         struct list_head chain_node; /* node in channel ops list */
 153         struct list_head group_list; /* list */
 154         unsigned int unmap_len;
 155         void *hw_desc;
 156         u16 stride;
 157         u16 idx;
 158         u16 slot_cnt;
 159         u8 src_cnt;
 160         u8 dst_cnt;
 161         u8 slots_per_op;
 162         u8 descs_per_op;
 163         unsigned long flags;
 164         unsigned long reverse_flags[8];
 165
 166 #define PPC440SPE_DESC_INT      0       /* generate interrupt on complete */
 167 #define PPC440SPE_ZERO_P        1       /* clear P destionaion */
 168 #define PPC440SPE_ZERO_Q        2       /* clear Q destination */
 169 #define PPC440SPE_COHERENT      3       /* src/dst are coherent */
 170
 171 #define PPC440SPE_DESC_WXOR     4       /* WXORs are in chain */
 172 #define PPC440SPE_DESC_RXOR     5       /* RXOR is in chain */
 173
 174 #define PPC440SPE_DESC_RXOR123  8       /* CDB for RXOR123 operation */
 175 #define PPC440SPE_DESC_RXOR124  9       /* CDB for RXOR124 operation */
 176 #define PPC440SPE_DESC_RXOR125  10      /* CDB for RXOR125 operation */
 177 #define PPC440SPE_DESC_RXOR12   11      /* CDB for RXOR12 operation */
 178 #define PPC440SPE_DESC_RXOR_REV 12      /* CDB has srcs in reversed order */
 179
 180 #define PPC440SPE_DESC_PCHECK   13
 181 #define PPC440SPE_DESC_QCHECK   14
 182
 183 #define PPC440SPE_DESC_RXOR_MSK 0x3
 184
 185         struct ppc440spe_rxor rxor_cursor;
 186
 187         union {
 188                 u32 *xor_check_result;
 189                 u32 *crc32_result;
 190         };
 191 };
 192
 193 #endif /* _PPC440SPE_ADMA_H */