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knav_dma.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2014 Texas Instruments Incorporated * Authors: Sandeep Nair <sandeep_n@ti.com * Cyril Chemparathy <cyril@ti.com Santosh Shilimkar <santosh.shilimkar@ti.com> */ #ifndef __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ #define __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ #include <linux/dmaengine.h> /* * PKTDMA descriptor manipulation macros for host packet descriptor */ #define MASK(x) (BIT(x) - 1) #define KNAV_DMA_DESC_PKT_LEN_MASK MASK(22) #define KNAV_DMA_DESC_PKT_LEN_SHIFT 0 #define KNAV_DMA_DESC_PS_INFO_IN_SOP BIT(22) #define KNAV_DMA_DESC_PS_INFO_IN_DESC 0 #define KNAV_DMA_DESC_TAG_MASK MASK(8) #define KNAV_DMA_DESC_SAG_HI_SHIFT 24 #define KNAV_DMA_DESC_STAG_LO_SHIFT 16 #define KNAV_DMA_DESC_DTAG_HI_SHIFT 8 #define KNAV_DMA_DESC_DTAG_LO_SHIFT 0 #define KNAV_DMA_DESC_HAS_EPIB BIT(31) #define KNAV_DMA_DESC_NO_EPIB 0 #define KNAV_DMA_DESC_PSLEN_SHIFT 24 #define KNAV_DMA_DESC_PSLEN_MASK MASK(6) #define KNAV_DMA_DESC_ERR_FLAG_SHIFT 20 #define KNAV_DMA_DESC_ERR_FLAG_MASK MASK(4) #define KNAV_DMA_DESC_PSFLAG_SHIFT 16 #define KNAV_DMA_DESC_PSFLAG_MASK MASK(4) #define KNAV_DMA_DESC_RETQ_SHIFT 0 #define KNAV_DMA_DESC_RETQ_MASK MASK(14) #define KNAV_DMA_DESC_BUF_LEN_MASK MASK(22) #define KNAV_DMA_DESC_EFLAGS_MASK MASK(4) #define KNAV_DMA_DESC_EFLAGS_SHIFT 20 #define KNAV_DMA_NUM_EPIB_WORDS 4 #define KNAV_DMA_NUM_PS_WORDS 16 #define KNAV_DMA_NUM_SW_DATA_WORDS 4 #define KNAV_DMA_FDQ_PER_CHAN 4 /* Tx channel scheduling priority */ enum knav_dma_tx_priority { DMA_PRIO_HIGH = 0, DMA_PRIO_MED_H, DMA_PRIO_MED_L, DMA_PRIO_LOW }; /* Rx channel error handling mode during buffer starvation */ enum knav_dma_rx_err_mode { DMA_DROP = 0, DMA_RETRY }; /* Rx flow size threshold configuration */ enum knav_dma_rx_thresholds { DMA_THRESH_NONE = 0, DMA_THRESH_0 = 1, DMA_THRESH_0_1 = 3, DMA_THRESH_0_1_2 = 7 }; /* Descriptor type */ enum knav_dma_desc_type { DMA_DESC_HOST = 0, DMA_DESC_MONOLITHIC = 2 }; /** * struct knav_dma_tx_cfg: Tx channel configuration * @filt_einfo: Filter extended packet info * @filt_pswords: Filter PS words present * @knav_dma_tx_priority: Tx channel scheduling priority */ struct knav_dma_tx_cfg { bool filt_einfo; bool filt_pswords; enum knav_dma_tx_priority priority; }; /** * struct knav_dma_rx_cfg: Rx flow configuration * @einfo_present: Extended packet info present * @psinfo_present: PS words present * @knav_dma_rx_err_mode: Error during buffer starvation * @knav_dma_desc_type: Host or Monolithic desc * @psinfo_at_sop: PS word located at start of packet * @sop_offset: Start of packet offset * @dst_q: Destination queue for a given flow * @thresh: Rx flow size threshold * @fdq[]: Free desc Queue array * @sz_thresh0: RX packet size threshold 0 * @sz_thresh1: RX packet size threshold 1 * @sz_thresh2: RX packet size threshold 2 */ struct knav_dma_rx_cfg { bool einfo_present; bool psinfo_present; enum knav_dma_rx_err_mode err_mode; enum knav_dma_desc_type desc_type; bool psinfo_at_sop; unsigned int sop_offset; unsigned int dst_q; enum knav_dma_rx_thresholds thresh; unsigned int fdq[KNAV_DMA_FDQ_PER_CHAN]; unsigned int sz_thresh0; unsigned int sz_thresh1; unsigned int sz_thresh2; }; /** * struct knav_dma_cfg: Pktdma channel configuration * @sl_cfg: Slave configuration * @tx: Tx channel configuration * @rx: Rx flow configuration */ struct knav_dma_cfg { enum dma_transfer_direction direction; union { struct knav_dma_tx_cfg tx; struct knav_dma_rx_cfg rx; } u; }; /** * struct knav_dma_desc: Host packet descriptor layout * @desc_info: Descriptor information like id, type, length * @tag_info: Flow tag info written in during RX * @packet_info: Queue Manager, policy, flags etc * @buff_len: Buffer length in bytes * @buff: Buffer pointer * @next_desc: For chaining the descriptors * @orig_len: length since 'buff_len' can be overwritten * @orig_buff: buff pointer since 'buff' can be overwritten * @epib: Extended packet info block * @psdata: Protocol specific * @sw_data: Software private data not touched by h/w */ struct knav_dma_desc { __le32 desc_info; __le32 tag_info; __le32 packet_info; __le32 buff_len; __le32 buff; __le32 next_desc; __le32 orig_len; __le32 orig_buff; __le32 epib[KNAV_DMA_NUM_EPIB_WORDS]; __le32 psdata[KNAV_DMA_NUM_PS_WORDS]; u32 sw_data[KNAV_DMA_NUM_SW_DATA_WORDS]; } ____cacheline_aligned; #if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA) void *knav_dma_open_channel(struct device *dev, const char *name, struct knav_dma_cfg *config); void knav_dma_close_channel(void *channel); int knav_dma_get_flow(void *channel); bool knav_dma_device_ready(void); #else static inline void *knav_dma_open_channel(struct device *dev, const char *name, struct knav_dma_cfg *config) { return (void *) NULL; } static inline void knav_dma_close_channel(void *channel) {} static inline int knav_dma_get_flow(void *channel) { return -EINVAL; } static inline bool knav_dma_device_ready(void) { return false; } #endif #endif /* __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ */
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