diff options
Diffstat (limited to 'arch/arm/plat-nomadik/include/plat/ste_dma40.h')
| -rw-r--r-- | arch/arm/plat-nomadik/include/plat/ste_dma40.h | 186 |
1 files changed, 127 insertions, 59 deletions
diff --git a/arch/arm/plat-nomadik/include/plat/ste_dma40.h b/arch/arm/plat-nomadik/include/plat/ste_dma40.h index 694587cb214..de86ef9b401 100644 --- a/arch/arm/plat-nomadik/include/plat/ste_dma40.h +++ b/arch/arm/plat-nomadik/include/plat/ste_dma40.h @@ -13,14 +13,8 @@ #include <linux/scatterlist.h> #include <linux/workqueue.h> #include <linux/interrupt.h> - -/* - * Maxium size for a single dma descriptor - * Size is limited to 16 bits. - * Size is in the units of addr-widths (1,2,4,8 bytes) - * Larger transfers will be split up to multiple linked desc - */ -#define STEDMA40_MAX_SEG_SIZE 0xFFFF +#include <linux/dmaengine.h> +#include <linux/version.h> /* dev types for memcpy */ #define STEDMA40_DEV_DST_MEMORY (-1) @@ -71,9 +65,9 @@ enum stedma40_flow_ctrl { }; enum stedma40_periph_data_width { - STEDMA40_BYTE_WIDTH = STEDMA40_ESIZE_8_BIT, - STEDMA40_HALFWORD_WIDTH = STEDMA40_ESIZE_16_BIT, - STEDMA40_WORD_WIDTH = STEDMA40_ESIZE_32_BIT, + STEDMA40_BYTE_WIDTH = STEDMA40_ESIZE_8_BIT, + STEDMA40_HALFWORD_WIDTH = STEDMA40_ESIZE_16_BIT, + STEDMA40_WORD_WIDTH = STEDMA40_ESIZE_32_BIT, STEDMA40_DOUBLEWORD_WIDTH = STEDMA40_ESIZE_64_BIT }; @@ -84,22 +78,22 @@ enum stedma40_xfer_dir { STEDMA40_PERIPH_TO_PERIPH }; - /** - * struct stedma40_chan_cfg - dst/src channel configuration + * struct stedma40_chan_cfg - dst/src channel configurration * - * @big_endian: true if the src/dst should be read as big endian + * @big_endian: true if src/dst should be read as big_endian * @data_width: Data width of the src/dst hardware - * @p_size: Burst size + * @psize: Burst size * @flow_ctrl: Flow control on/off. */ struct stedma40_half_channel_info { - bool big_endian; + bool big_endian; enum stedma40_periph_data_width data_width; - int psize; - enum stedma40_flow_ctrl flow_ctrl; + int psize; + enum stedma40_flow_ctrl flow_ctrl; }; + /** * struct stedma40_chan_cfg - Structure to be filled by client drivers. * @@ -113,7 +107,8 @@ struct stedma40_half_channel_info { * @dst_dev_type: Dst device type * @src_info: Parameters for dst half channel * @dst_info: Parameters for dst half channel - * + * @use_fixed_channel: if true, use the physical channel specified by phy_channel + * @phy_channel: physical channel to use, only if use_fixed_channel is true * * This structure has to be filled by the client drivers. * It is recommended to do all dma configurations for clients in the machine. @@ -121,14 +116,19 @@ struct stedma40_half_channel_info { */ struct stedma40_chan_cfg { enum stedma40_xfer_dir dir; + bool high_priority; bool realtime; enum stedma40_mode mode; enum stedma40_mode_opt mode_opt; + int src_dev_type; int dst_dev_type; struct stedma40_half_channel_info src_info; struct stedma40_half_channel_info dst_info; + + bool use_fixed_channel; + int phy_channel; }; /** @@ -157,7 +157,102 @@ struct stedma40_platform_data { bool use_esram_lcla; }; -#ifdef CONFIG_STE_DMA40 +struct d40_desc; + +/** + * struct stedma40_cyclic_desc - Cyclic DMA descriptor + * @d40d: DMA driver internal descriptor + * @period_callback: callback to be called after every link/period if + * the DMA_PREP_INTERRUPT flag is used when preparing + * the transaction + * @period_callback_param: handle passed to the period_callback + * + * A pointer to a structure of this type is returned from the + * stedma40_cyclic_prep_sg() function. The period_callback and + * period_callback_param members can be set by the client. + */ +struct stedma40_cyclic_desc { + struct d40_desc *d40d; + dma_async_tx_callback period_callback; + void *period_callback_param; +}; + +int stedma40_set_dev_addr(struct dma_chan *chan, + dma_addr_t src_dev_addr, + dma_addr_t dst_dev_addr); + +/* + * stedma40_get_src_addr - get current source address + * @chan: the DMA channel + * + * Returns the physical address of the current source element to be read by the + * DMA. + */ +dma_addr_t stedma40_get_src_addr(struct dma_chan *chan); + +/* + * stedma40_get_dst_addr - get current destination address + * @chan: the DMA channel + * + * Returns the physical address of the current destination element to be + * written by the DMA. + */ +dma_addr_t stedma40_get_dst_addr(struct dma_chan *chan); + +/** + * stedma40_cyclic_prep_sg - prepare a cyclic DMA transfer + * @chan: the DMA channel to prepare + * @sgl: scatter list + * @sg_len: number of links in the scatter list + * @direction: transfer direction, to or from device + * @dma_flags: DMA_PREP_INTERRUPT if a callback is required after every link. + * See period_callback in struct stedma40_cyclic_desc. + * + * Must be called before trying to start a cyclic DMA transfer. Returns + * ERR_PTR(-errno) on failure. + */ +struct stedma40_cyclic_desc * +stedma40_cyclic_prep_sg(struct dma_chan *chan, + struct scatterlist *sgl, + unsigned int sg_len, + enum dma_data_direction direction, + unsigned long dma_flags); + +/** + * stedma40_cyclic_start - start the cyclic DMA transfer + * @chan: the DMA channel to start + * + * The cyclic DMA must have been prepared earlier with + * stedma40_cyclic_prep_sg(). + */ +int stedma40_cyclic_start(struct dma_chan *chan); + +/** + * stedma40_cyclic_stop() - stop the cyclic DMA transfer + * @chan: the DMA channel to stop + * + * Stops a cyclic DMA transfer which was previously started with + * stedma40_cyclic_start(). + */ +void stedma40_cyclic_stop(struct dma_chan *chan); + +/** + * stedma40_cyclic_free() - free cyclic DMA resources + * @chan: the DMA channel + * + * Must be called to free any resources used for cyclic DMA which have been + * allocated in stedma40_cyclic_prep_sg(). + */ +void stedma40_cyclic_free(struct dma_chan *chan); + +/** + * setdma40_residue() - Returna the remaining bytes to transfer. + * + * @chan: dmaengine handle + * + * returns 0 or positive number of remaning bytes. + */ +u32 stedma40_residue(struct dma_chan *chan); /** * stedma40_filter() - Provides stedma40_chan_cfg to the @@ -171,51 +266,24 @@ struct stedma40_platform_data { * * */ - bool stedma40_filter(struct dma_chan *chan, void *data); /** - * stedma40_slave_mem() - Transfers a raw data buffer to or from a slave - * (=device) + * stedma40_memcpy_sg() - extension of the dma framework, memcpy to/from + * scattergatter lists. * * @chan: dmaengine handle - * @addr: source or destination physicall address. - * @size: bytes to transfer - * @direction: direction of transfer + * @sgl_dst: Destination scatter list + * @sgl_src: Source scatter list + * @sgl_len: The length of each scatterlist. Both lists must be of equal length + * and each element must match the corresponding element in the other scatter + * list. * @flags: is actually enum dma_ctrl_flags. See dmaengine.h */ - -static inline struct -dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan, - dma_addr_t addr, - unsigned int size, - enum dma_data_direction direction, - unsigned long flags) -{ - struct scatterlist sg; - sg_init_table(&sg, 1); - sg.dma_address = addr; - sg.length = size; - - return chan->device->device_prep_slave_sg(chan, &sg, 1, - direction, flags); -} - -#else -static inline bool stedma40_filter(struct dma_chan *chan, void *data) -{ - return false; -} - -static inline struct -dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan, - dma_addr_t addr, - unsigned int size, - enum dma_data_direction direction, - unsigned long flags) -{ - return NULL; -} -#endif +struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan, + struct scatterlist *sgl_dst, + struct scatterlist *sgl_src, + unsigned int sgl_len, + unsigned long flags); #endif |