![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
*参照元 [#ybeb67f2] #backlinks *説明 [#oe8abf75] -パス: [[linux-4.4.1/include/linux/dmaengine.h]] -FIXME: これは何？ --説明 **参考 [#wddb7e64] *実装 [#ndb52a69] /** * struct dma_device - info on the entity supplying DMA services * @chancnt: how many DMA channels are supported * @privatecnt: how many DMA channels are requested by dma_request_channel * @channels: the list of struct dma_chan * @global_node: list_head for global dma_device_list * @cap_mask: one or more dma_capability flags * @max_xor: maximum number of xor sources, 0 if no capability * @max_pq: maximum number of PQ sources and PQ-continue capability * @copy_align: alignment shift for memcpy operations * @xor_align: alignment shift for xor operations * @pq_align: alignment shift for pq operations * @fill_align: alignment shift for memset operations * @dev_id: unique device ID * @dev: struct device reference for dma mapping api * @src_addr_widths: bit mask of src addr widths the device supports * @dst_addr_widths: bit mask of dst addr widths the device supports * @directions: bit mask of slave direction the device supports since * the enum dma_transfer_direction is not defined as bits for * each type of direction, the dma controller should fill (1 << * <TYPE>) and same should be checked by controller as well * @residue_granularity: granularity of the transfer residue reported * by tx_status * @device_alloc_chan_resources: allocate resources and return the * number of allocated descriptors * @device_free_chan_resources: release DMA channel's resources * @device_prep_dma_memcpy: prepares a memcpy operation * @device_prep_dma_xor: prepares a xor operation * @device_prep_dma_xor_val: prepares a xor validation operation * @device_prep_dma_pq: prepares a pq operation * @device_prep_dma_pq_val: prepares a pqzero_sum operation * @device_prep_dma_memset: prepares a memset operation * @device_prep_dma_memset_sg: prepares a memset operation over a scatter list * @device_prep_dma_interrupt: prepares an end of chain interrupt operation * @device_prep_slave_sg: prepares a slave dma operation * @device_prep_dma_cyclic: prepare a cyclic dma operation suitable for audio. * The function takes a buffer of size buf_len. The callback function will * be called after period_len bytes have been transferred. * @device_prep_interleaved_dma: Transfer expression in a generic way. * @device_prep_dma_imm_data: DMA's 8 byte immediate data to the dst address * @device_config: Pushes a new configuration to a channel, return 0 or an error * code * @device_pause: Pauses any transfer happening on a channel. Returns * 0 or an error code * @device_resume: Resumes any transfer on a channel previously * paused. Returns 0 or an error code * @device_terminate_all: Aborts all transfers on a channel. Returns 0 * or an error code * @device_tx_status: poll for transaction completion, the optional * txstate parameter can be supplied with a pointer to get a * struct with auxiliary transfer status information, otherwise the call * will just return a simple status code * @device_issue_pending: push pending transactions to hardware */ struct dma_device { unsigned int chancnt; unsigned int privatecnt; struct list_head channels; struct list_head global_node; - --[[linux-4.4.1/list_head]] dma_cap_mask_t cap_mask; - --[[linux-4.4.1/dma_cap_mask_t]] unsigned short max_xor; unsigned short max_pq; enum dmaengine_alignment copy_align; enum dmaengine_alignment xor_align; enum dmaengine_alignment pq_align; enum dmaengine_alignment fill_align; - --[[linux-4.4.1/dmaengine_alignment]] #define DMA_HAS_PQ_CONTINUE (1 << 15) int dev_id; struct device *dev; - --[[linux-4.4.1/device]] u32 src_addr_widths; u32 dst_addr_widths; u32 directions; enum dma_residue_granularity residue_granularity; - --[[linux-4.4.1/dma_residue_granularity]] int (*device_alloc_chan_resources)(struct dma_chan *chan); void (*device_free_chan_resources)(struct dma_chan *chan); - --[[linux-4.4.1/dma_chan]] struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)( struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, size_t len, unsigned long flags); - --[[linux-4.4.1/dma_addr_t]] struct dma_async_tx_descriptor *(*device_prep_dma_xor)( struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src, unsigned int src_cnt, size_t len, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)( struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, size_t len, enum sum_check_flags *result, unsigned long flags); - --[[linux-4.4.1/sum_check_flags]] struct dma_async_tx_descriptor *(*device_prep_dma_pq)( struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, unsigned int src_cnt, const unsigned char *scf, size_t len, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_pq_val)( struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, unsigned int src_cnt, const unsigned char *scf, size_t len, enum sum_check_flags *pqres, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset)( struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_memset_sg)( struct dma_chan *chan, struct scatterlist *sg, unsigned int nents, int value, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)( struct dma_chan *chan, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_dma_sg)( struct dma_chan *chan, struct scatterlist *dst_sg, unsigned int dst_nents, struct scatterlist *src_sg, unsigned int src_nents, unsigned long flags); - --[[linux-4.4.1/scatterlist]] struct dma_async_tx_descriptor *(*device_prep_slave_sg)( struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, unsigned long flags, void *context); - --[[linux-4.4.1/dma_transfer_direction]] struct dma_async_tx_descriptor *(*device_prep_dma_cyclic)( struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction, unsigned long flags); struct dma_async_tx_descriptor *(*device_prep_interleaved_dma)( struct dma_chan *chan, struct dma_interleaved_template *xt, unsigned long flags); - --[[linux-4.4.1/dma_interleaved_template]] struct dma_async_tx_descriptor *(*device_prep_dma_imm_data)( struct dma_chan *chan, dma_addr_t dst, u64 data, unsigned long flags); int (*device_config)(struct dma_chan *chan, struct dma_slave_config *config); - --[[linux-4.4.1/dma_slave_config]] int (*device_pause)(struct dma_chan *chan); int (*device_resume)(struct dma_chan *chan); int (*device_terminate_all)(struct dma_chan *chan); enum dma_status (*device_tx_status)(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate); - --[[linux-4.4.1/dma_cookie_t]] void (*device_issue_pending)(struct dma_chan *chan); }; *コメント [#u187dcad]
