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 | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/include/plat/ste_dma40.h b/arch/arm/plat-nomadik/include/plat/ste_dma40.h new file mode 100644 index 00000000000..4d12ea4ca36 --- /dev/null +++ b/arch/arm/plat-nomadik/include/plat/ste_dma40.h @@ -0,0 +1,239 @@ +/* + * arch/arm/plat-nomadik/include/plat/ste_dma40.h + * + * Copyright (C) ST-Ericsson 2007-2010 + * License terms: GNU General Public License (GPL) version 2 + * Author: Per Friden <per.friden@stericsson.com> + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> + */ + + +#ifndef STE_DMA40_H +#define STE_DMA40_H + +#include <linux/dmaengine.h> +#include <linux/workqueue.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> + +/* dev types for memcpy */ +#define STEDMA40_DEV_DST_MEMORY (-1) +#define STEDMA40_DEV_SRC_MEMORY (-1) + +/* + * Description of bitfields of channel_type variable is available in + * the info structure. + */ + +/* Priority */ +#define STEDMA40_INFO_PRIO_TYPE_POS 2 +#define STEDMA40_HIGH_PRIORITY_CHANNEL (0x1 << STEDMA40_INFO_PRIO_TYPE_POS) +#define STEDMA40_LOW_PRIORITY_CHANNEL (0x2 << STEDMA40_INFO_PRIO_TYPE_POS) + +/* Mode */ +#define STEDMA40_INFO_CH_MODE_TYPE_POS 6 +#define STEDMA40_CHANNEL_IN_PHY_MODE (0x1 << STEDMA40_INFO_CH_MODE_TYPE_POS) +#define STEDMA40_CHANNEL_IN_LOG_MODE (0x2 << STEDMA40_INFO_CH_MODE_TYPE_POS) +#define STEDMA40_CHANNEL_IN_OPER_MODE (0x3 << STEDMA40_INFO_CH_MODE_TYPE_POS) + +/* Mode options */ +#define STEDMA40_INFO_CH_MODE_OPT_POS 8 +#define STEDMA40_PCHAN_BASIC_MODE (0x1 << STEDMA40_INFO_CH_MODE_OPT_POS) +#define STEDMA40_PCHAN_MODULO_MODE (0x2 << STEDMA40_INFO_CH_MODE_OPT_POS) +#define STEDMA40_PCHAN_DOUBLE_DST_MODE (0x3 << STEDMA40_INFO_CH_MODE_OPT_POS) +#define STEDMA40_LCHAN_SRC_PHY_DST_LOG (0x1 << STEDMA40_INFO_CH_MODE_OPT_POS) +#define STEDMA40_LCHAN_SRC_LOG_DST_PHS (0x2 << STEDMA40_INFO_CH_MODE_OPT_POS) +#define STEDMA40_LCHAN_SRC_LOG_DST_LOG (0x3 << STEDMA40_INFO_CH_MODE_OPT_POS) + +/* Interrupt */ +#define STEDMA40_INFO_TIM_POS 10 +#define STEDMA40_NO_TIM_FOR_LINK (0x0 << STEDMA40_INFO_TIM_POS) +#define STEDMA40_TIM_FOR_LINK (0x1 << STEDMA40_INFO_TIM_POS) + +/* End of channel_type configuration */ + +#define STEDMA40_ESIZE_8_BIT 0x0 +#define STEDMA40_ESIZE_16_BIT 0x1 +#define STEDMA40_ESIZE_32_BIT 0x2 +#define STEDMA40_ESIZE_64_BIT 0x3 + +/* The value 4 indicates that PEN-reg shall be set to 0 */ +#define STEDMA40_PSIZE_PHY_1 0x4 +#define STEDMA40_PSIZE_PHY_2 0x0 +#define STEDMA40_PSIZE_PHY_4 0x1 +#define STEDMA40_PSIZE_PHY_8 0x2 +#define STEDMA40_PSIZE_PHY_16 0x3 + +/* + * The number of elements differ in logical and + * physical mode + */ +#define STEDMA40_PSIZE_LOG_1 STEDMA40_PSIZE_PHY_2 +#define STEDMA40_PSIZE_LOG_4 STEDMA40_PSIZE_PHY_4 +#define STEDMA40_PSIZE_LOG_8 STEDMA40_PSIZE_PHY_8 +#define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16 + +enum stedma40_flow_ctrl { + STEDMA40_NO_FLOW_CTRL, + STEDMA40_FLOW_CTRL, +}; + +enum stedma40_endianess { + STEDMA40_LITTLE_ENDIAN, + STEDMA40_BIG_ENDIAN +}; + +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_DOUBLEWORD_WIDTH = STEDMA40_ESIZE_64_BIT +}; + +struct stedma40_half_channel_info { + enum stedma40_endianess endianess; + enum stedma40_periph_data_width data_width; + int psize; + enum stedma40_flow_ctrl flow_ctrl; +}; + +enum stedma40_xfer_dir { + STEDMA40_MEM_TO_MEM, + STEDMA40_MEM_TO_PERIPH, + STEDMA40_PERIPH_TO_MEM, + STEDMA40_PERIPH_TO_PERIPH +}; + + +/** + * struct stedma40_chan_cfg - Structure to be filled by client drivers. + * + * @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH + * @channel_type: priority, mode, mode options and interrupt configuration. + * @src_dev_type: Src device type + * @dst_dev_type: Dst device type + * @src_info: Parameters for dst half channel + * @dst_info: Parameters for dst half channel + * @pre_transfer_data: Data to be passed on to the pre_transfer() function. + * @pre_transfer: Callback used if needed before preparation of transfer. + * Only called if device is set. size of bytes to transfer + * (in case of multiple element transfer size is size of the first element). + * + * + * This structure has to be filled by the client drivers. + * It is recommended to do all dma configurations for clients in the machine. + * + */ +struct stedma40_chan_cfg { + enum stedma40_xfer_dir dir; + unsigned int channel_type; + int src_dev_type; + int dst_dev_type; + struct stedma40_half_channel_info src_info; + struct stedma40_half_channel_info dst_info; + void *pre_transfer_data; + int (*pre_transfer) (struct dma_chan *chan, + void *data, + int size); +}; + +/** + * struct stedma40_platform_data - Configuration struct for the dma device. + * + * @dev_len: length of dev_tx and dev_rx + * @dev_tx: mapping between destination event line and io address + * @dev_rx: mapping between source event line and io address + * @memcpy: list of memcpy event lines + * @memcpy_len: length of memcpy + * @memcpy_conf_phy: default configuration of physical channel memcpy + * @memcpy_conf_log: default configuration of logical channel memcpy + * @llis_per_log: number of max linked list items per logical channel + * + */ +struct stedma40_platform_data { + u32 dev_len; + const dma_addr_t *dev_tx; + const dma_addr_t *dev_rx; + int *memcpy; + u32 memcpy_len; + struct stedma40_chan_cfg *memcpy_conf_phy; + struct stedma40_chan_cfg *memcpy_conf_log; + unsigned int llis_per_log; +}; + +/** + * setdma40_set_psize() - Used for changing the package size of an + * already configured dma channel. + * + * @chan: dmaengine handle + * @src_psize: new package side for src. (STEDMA40_PSIZE*) + * @src_psize: new package side for dst. (STEDMA40_PSIZE*) + * + * returns 0 on ok, otherwise negative error number. + */ +int stedma40_set_psize(struct dma_chan *chan, + int src_psize, + int dst_psize); + +/** + * stedma40_filter() - Provides stedma40_chan_cfg to the + * ste_dma40 dma driver via the dmaengine framework. + * does some checking of what's provided. + * + * Never directly called by client. It used by dmaengine. + * @chan: dmaengine handle. + * @data: Must be of type: struct stedma40_chan_cfg and is + * the configuration of the framework. + * + * + */ + +bool stedma40_filter(struct dma_chan *chan, void *data); + +/** + * stedma40_memcpy_sg() - extension of the dma framework, memcpy to/from + * scattergatter lists. + * + * @chan: dmaengine handle + * @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 + */ + +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); + +/** + * stedma40_slave_mem() - Transfers a raw data buffer to or from a slave + * (=device) + * + * @chan: dmaengine handle + * @addr: source or destination physicall address. + * @size: bytes to transfer + * @direction: direction of transfer + * @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); +} + +#endif |