a2dd6877b4
This patch provide APIs to allow client drivers to support probe deferral. On K2G SoC, devices can be probed only after the ti_sci_pm_domains driver is probed and ready. As drivers may get probed at different order, any driver that depends on knav dma and qmss drivers, for example netcp network driver, needs to defer probe until knav devices are probed and ready to service. To do this, add an API to query the device ready status from the knav dma and qmss devices. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
194 lines
5.5 KiB
C
194 lines
5.5 KiB
C
/*
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* Copyright (C) 2014 Texas Instruments Incorporated
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* Authors: Sandeep Nair <sandeep_n@ti.com
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* Cyril Chemparathy <cyril@ti.com
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Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
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#define __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
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#include <linux/dmaengine.h>
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/*
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* PKTDMA descriptor manipulation macros for host packet descriptor
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*/
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#define MASK(x) (BIT(x) - 1)
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#define KNAV_DMA_DESC_PKT_LEN_MASK MASK(22)
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#define KNAV_DMA_DESC_PKT_LEN_SHIFT 0
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#define KNAV_DMA_DESC_PS_INFO_IN_SOP BIT(22)
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#define KNAV_DMA_DESC_PS_INFO_IN_DESC 0
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#define KNAV_DMA_DESC_TAG_MASK MASK(8)
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#define KNAV_DMA_DESC_SAG_HI_SHIFT 24
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#define KNAV_DMA_DESC_STAG_LO_SHIFT 16
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#define KNAV_DMA_DESC_DTAG_HI_SHIFT 8
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#define KNAV_DMA_DESC_DTAG_LO_SHIFT 0
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#define KNAV_DMA_DESC_HAS_EPIB BIT(31)
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#define KNAV_DMA_DESC_NO_EPIB 0
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#define KNAV_DMA_DESC_PSLEN_SHIFT 24
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#define KNAV_DMA_DESC_PSLEN_MASK MASK(6)
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#define KNAV_DMA_DESC_ERR_FLAG_SHIFT 20
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#define KNAV_DMA_DESC_ERR_FLAG_MASK MASK(4)
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#define KNAV_DMA_DESC_PSFLAG_SHIFT 16
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#define KNAV_DMA_DESC_PSFLAG_MASK MASK(4)
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#define KNAV_DMA_DESC_RETQ_SHIFT 0
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#define KNAV_DMA_DESC_RETQ_MASK MASK(14)
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#define KNAV_DMA_DESC_BUF_LEN_MASK MASK(22)
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#define KNAV_DMA_DESC_EFLAGS_MASK MASK(4)
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#define KNAV_DMA_DESC_EFLAGS_SHIFT 20
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#define KNAV_DMA_NUM_EPIB_WORDS 4
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#define KNAV_DMA_NUM_PS_WORDS 16
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#define KNAV_DMA_NUM_SW_DATA_WORDS 4
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#define KNAV_DMA_FDQ_PER_CHAN 4
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/* Tx channel scheduling priority */
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enum knav_dma_tx_priority {
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DMA_PRIO_HIGH = 0,
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DMA_PRIO_MED_H,
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DMA_PRIO_MED_L,
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DMA_PRIO_LOW
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};
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/* Rx channel error handling mode during buffer starvation */
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enum knav_dma_rx_err_mode {
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DMA_DROP = 0,
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DMA_RETRY
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};
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/* Rx flow size threshold configuration */
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enum knav_dma_rx_thresholds {
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DMA_THRESH_NONE = 0,
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DMA_THRESH_0 = 1,
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DMA_THRESH_0_1 = 3,
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DMA_THRESH_0_1_2 = 7
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};
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/* Descriptor type */
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enum knav_dma_desc_type {
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DMA_DESC_HOST = 0,
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DMA_DESC_MONOLITHIC = 2
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};
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/**
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* struct knav_dma_tx_cfg: Tx channel configuration
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* @filt_einfo: Filter extended packet info
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* @filt_pswords: Filter PS words present
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* @knav_dma_tx_priority: Tx channel scheduling priority
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*/
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struct knav_dma_tx_cfg {
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bool filt_einfo;
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bool filt_pswords;
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enum knav_dma_tx_priority priority;
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};
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/**
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* struct knav_dma_rx_cfg: Rx flow configuration
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* @einfo_present: Extended packet info present
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* @psinfo_present: PS words present
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* @knav_dma_rx_err_mode: Error during buffer starvation
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* @knav_dma_desc_type: Host or Monolithic desc
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* @psinfo_at_sop: PS word located at start of packet
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* @sop_offset: Start of packet offset
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* @dst_q: Destination queue for a given flow
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* @thresh: Rx flow size threshold
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* @fdq[]: Free desc Queue array
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* @sz_thresh0: RX packet size threshold 0
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* @sz_thresh1: RX packet size threshold 1
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* @sz_thresh2: RX packet size threshold 2
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*/
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struct knav_dma_rx_cfg {
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bool einfo_present;
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bool psinfo_present;
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enum knav_dma_rx_err_mode err_mode;
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enum knav_dma_desc_type desc_type;
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bool psinfo_at_sop;
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unsigned int sop_offset;
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unsigned int dst_q;
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enum knav_dma_rx_thresholds thresh;
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unsigned int fdq[KNAV_DMA_FDQ_PER_CHAN];
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unsigned int sz_thresh0;
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unsigned int sz_thresh1;
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unsigned int sz_thresh2;
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};
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/**
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* struct knav_dma_cfg: Pktdma channel configuration
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* @sl_cfg: Slave configuration
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* @tx: Tx channel configuration
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* @rx: Rx flow configuration
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*/
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struct knav_dma_cfg {
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enum dma_transfer_direction direction;
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union {
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struct knav_dma_tx_cfg tx;
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struct knav_dma_rx_cfg rx;
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} u;
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};
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/**
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* struct knav_dma_desc: Host packet descriptor layout
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* @desc_info: Descriptor information like id, type, length
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* @tag_info: Flow tag info written in during RX
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* @packet_info: Queue Manager, policy, flags etc
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* @buff_len: Buffer length in bytes
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* @buff: Buffer pointer
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* @next_desc: For chaining the descriptors
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* @orig_len: length since 'buff_len' can be overwritten
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* @orig_buff: buff pointer since 'buff' can be overwritten
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* @epib: Extended packet info block
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* @psdata: Protocol specific
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* @sw_data: Software private data not touched by h/w
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*/
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struct knav_dma_desc {
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__le32 desc_info;
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__le32 tag_info;
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__le32 packet_info;
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__le32 buff_len;
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__le32 buff;
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__le32 next_desc;
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__le32 orig_len;
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__le32 orig_buff;
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__le32 epib[KNAV_DMA_NUM_EPIB_WORDS];
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__le32 psdata[KNAV_DMA_NUM_PS_WORDS];
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u32 sw_data[KNAV_DMA_NUM_SW_DATA_WORDS];
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} ____cacheline_aligned;
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#if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA)
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void *knav_dma_open_channel(struct device *dev, const char *name,
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struct knav_dma_cfg *config);
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void knav_dma_close_channel(void *channel);
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int knav_dma_get_flow(void *channel);
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bool knav_dma_device_ready(void);
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#else
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static inline void *knav_dma_open_channel(struct device *dev, const char *name,
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struct knav_dma_cfg *config)
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{
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return (void *) NULL;
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}
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static inline void knav_dma_close_channel(void *channel)
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{}
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static inline int knav_dma_get_flow(void *channel)
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{
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return -EINVAL;
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}
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static inline bool knav_dma_device_ready(void)
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{
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return false;
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}
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#endif
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#endif /* __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ */
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