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/*
* Copyright (C) 2014 Texas Instruments Incorporated
* Authors: Sandeep Nair <sandeep_n@ti.com
* Cyril Chemparathy <cyril@ti.com
Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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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