/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright ( C ) 2019 - 2024 Linaro Ltd .
*/
#ifndef _IPA_ENDPOINT_H_
#define _IPA_ENDPOINT_H_
#include <linux/types.h>
#include <linux/workqueue.h>
#include "ipa_reg.h"
#include "ipa_version.h"
struct net_device;
struct sk_buff;
struct gsi_trans;
struct ipa;
struct ipa_gsi_endpoint_data;
/* Non-zero granularity of counter used to implement aggregation timeout */
#define IPA_AGGR_GRANULARITY 500 /* microseconds */
#define IPA_MTU ETH_DATA_LEN
enum ipa_endpoint_name {
IPA_ENDPOINT_AP_COMMAND_TX,
IPA_ENDPOINT_AP_LAN_RX,
IPA_ENDPOINT_AP_MODEM_TX,
IPA_ENDPOINT_AP_MODEM_RX,
IPA_ENDPOINT_MODEM_COMMAND_TX,
IPA_ENDPOINT_MODEM_LAN_TX,
IPA_ENDPOINT_MODEM_LAN_RX,
IPA_ENDPOINT_MODEM_AP_TX,
IPA_ENDPOINT_MODEM_AP_RX,
IPA_ENDPOINT_MODEM_DL_NLO_TX,
IPA_ENDPOINT_COUNT, /* Number of names (not an index) */
};
#define IPA_ENDPOINT_MAX 36 /* Max supported by driver */
/**
* struct ipa_endpoint_tx - Endpoint configuration for TX endpoints
* @ seq_type : primary packet processing sequencer type
* @ seq_rep_type : sequencer type for replication processing
* @ status_endpoint : endpoint to which status elements are sent
*
* The @ status_endpoint is only valid if the endpoint ' s @ status_enable
* flag is set .
*/
struct ipa_endpoint_tx {
enum ipa_seq_type seq_type;
enum ipa_seq_rep_type seq_rep_type;
enum ipa_endpoint_name status_endpoint;
};
/**
* struct ipa_endpoint_rx - Endpoint configuration for RX endpoints
* @ buffer_size : requested receive buffer size ( bytes )
* @ pad_align : power - of - 2 boundary to which packet payload is aligned
* @ aggr_time_limit : time before aggregation closes ( microseconds )
* @ aggr_hard_limit : whether aggregation closes before or after boundary
* @ aggr_close_eof : whether aggregation closes on end - of - frame
* @ holb_drop : whether to drop packets to avoid head - of - line blocking
*
* The actual size of the receive buffer is rounded up if necessary
* to be a power - of - 2 number of pages .
*
* With each packet it transfers , the IPA hardware can perform certain
* transformations of its packet data . One of these is adding pad bytes
* to the end of the packet data so the result ends on a power - of - 2 boundary .
*
* It is also able to aggregate multiple packets into a single receive buffer .
* Aggregation is " open " while a buffer is being filled , and " closes " when
* certain criteria are met .
*
* A time limit can be specified to close aggregation . Aggregation will be
* closed if this period passes after data is first written into a receive
* buffer . If not specified , no time limit is imposed .
*
* Insufficient space available in the receive buffer can close aggregation .
* The aggregation byte limit defines the point ( in units of 1024 bytes ) in
* the buffer where aggregation closes . With a " soft " aggregation limit ,
* aggregation closes when a packet written to the buffer * crosses * that
* aggregation limit . With a " hard " aggregation limit , aggregation will
* close * before * writing a packet that would cross that boundary .
*/
struct ipa_endpoint_rx {
u32 buffer_size;
u32 pad_align;
u32 aggr_time_limit;
bool aggr_hard_limit;
bool aggr_close_eof;
bool holb_drop;
};
/**
* struct ipa_endpoint_config - IPA endpoint hardware configuration
* @ resource_group : resource group to assign endpoint to
* @ checksum : whether checksum offload is enabled
* @ qmap : whether endpoint uses QMAP protocol
* @ aggregation : whether endpoint supports aggregation
* @ status_enable : whether endpoint uses status elements
* @ dma_mode : whether endpoint operates in DMA mode
* @ dma_endpoint : peer endpoint , if operating in DMA mode
* @ tx : TX - specific endpoint information ( see above )
* @ rx : RX - specific endpoint information ( see above )
*/
struct ipa_endpoint_config {
u32 resource_group;
bool checksum;
bool qmap;
bool aggregation;
bool status_enable;
bool dma_mode;
enum ipa_endpoint_name dma_endpoint;
union {
struct ipa_endpoint_tx tx;
struct ipa_endpoint_rx rx;
};
};
/**
* enum ipa_replenish_flag : RX buffer replenish flags
*
* @ IPA_REPLENISH_ENABLED : Whether receive buffer replenishing is enabled
* @ IPA_REPLENISH_ACTIVE : Whether replenishing is underway
* @ IPA_REPLENISH_COUNT : Number of defined replenish flags
*/
enum ipa_replenish_flag {
IPA_REPLENISH_ENABLED,
IPA_REPLENISH_ACTIVE,
IPA_REPLENISH_COUNT, /* Number of flags (must be last) */
};
/**
* struct ipa_endpoint - IPA endpoint information
* @ ipa : IPA pointer
* @ ee_id : Execution environmnent endpoint is associated with
* @ channel_id : GSI channel used by the endpoint
* @ endpoint_id : IPA endpoint number
* @ toward_ipa : Endpoint direction ( true = TX , false = RX )
* @ config : Default endpoint configuration
* @ skb_frag_max : Maximum allowed number of TX SKB fragments
* @ evt_ring_id : GSI event ring used by the endpoint
* @ netdev : Network device pointer , if endpoint uses one
* @ replenish_flags : Replenishing state flags
* @ replenish_count : Total number of replenish transactions committed
* @ replenish_work : Work item used for repeated replenish failures
*/
struct ipa_endpoint {
struct ipa *ipa;
enum gsi_ee_id ee_id;
u32 channel_id;
u32 endpoint_id;
bool toward_ipa;
struct ipa_endpoint_config config;
u32 skb_frag_max; /* Used for netdev TX only */
u32 evt_ring_id;
/* Net device this endpoint is associated with, if any */
struct net_device *netdev;
/* Receive buffer replenishing for RX endpoints */
DECLARE_BITMAP(replenish_flags, IPA_REPLENISH_COUNT);
u64 replenish_count;
struct delayed_work replenish_work; /* global wq */
};
void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa);
void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable);
int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa);
int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb);
int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint);
void ipa_endpoint_suspend(struct ipa *ipa);
void ipa_endpoint_resume(struct ipa *ipa);
void ipa_endpoint_setup(struct ipa *ipa);
void ipa_endpoint_teardown(struct ipa *ipa);
int ipa_endpoint_config(struct ipa *ipa);
void ipa_endpoint_deconfig(struct ipa *ipa);
void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id);
void ipa_endpoint_default_route_clear(struct ipa *ipa);
int ipa_endpoint_init(struct ipa *ipa, u32 count,
const struct ipa_gsi_endpoint_data *data);
void ipa_endpoint_exit(struct ipa *ipa);
void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
struct gsi_trans *trans);
void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
struct gsi_trans *trans);
#endif /* _IPA_ENDPOINT_H_ */
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