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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2019-2022 Linaro Ltd.
*/
#ifndef _IPA_CMD_H_
#define _IPA_CMD_H_
#include <linux/types.h>
#include <linux/dma-direction.h>
struct sk_buff;
struct scatterlist;
struct ipa;
struct ipa_mem;
struct gsi_trans;
struct gsi_channel;
/**
* enum ipa_cmd_opcode: IPA immediate commands
*
* @IPA_CMD_IP_V4_FILTER_INIT: Initialize IPv4 filter table
* @IPA_CMD_IP_V6_FILTER_INIT: Initialize IPv6 filter table
* @IPA_CMD_IP_V4_ROUTING_INIT: Initialize IPv4 routing table
* @IPA_CMD_IP_V6_ROUTING_INIT: Initialize IPv6 routing table
* @IPA_CMD_HDR_INIT_LOCAL: Initialize IPA-local header memory
* @IPA_CMD_REGISTER_WRITE: Register write performed by IPA
* @IPA_CMD_IP_PACKET_INIT: Set up next packet's destination endpoint
* @IPA_CMD_DMA_SHARED_MEM: DMA command performed by IPA
* @IPA_CMD_IP_PACKET_TAG_STATUS: Have next packet generate tag * status
* @IPA_CMD_NONE: Special (invalid) "not a command" value
*
* All immediate commands are issued using the AP command TX endpoint.
*/
enum ipa_cmd_opcode {
IPA_CMD_NONE = 0x0,
IPA_CMD_IP_V4_FILTER_INIT = 0x3,
IPA_CMD_IP_V6_FILTER_INIT = 0x4,
IPA_CMD_IP_V4_ROUTING_INIT = 0x7,
IPA_CMD_IP_V6_ROUTING_INIT = 0x8,
IPA_CMD_HDR_INIT_LOCAL = 0x9,
IPA_CMD_REGISTER_WRITE = 0xc,
IPA_CMD_IP_PACKET_INIT = 0x10,
IPA_CMD_DMA_SHARED_MEM = 0x13,
IPA_CMD_IP_PACKET_TAG_STATUS = 0x14,
};
/**
* ipa_cmd_table_init_valid() - Validate a memory region holding a table
* @ipa: - IPA pointer
* @mem: - IPA memory region descriptor
* @route: - Whether the region holds a route or filter table
*
* Return: true if region is valid, false otherwise
*/
bool ipa_cmd_table_init_valid(struct ipa *ipa, const struct ipa_mem *mem,
bool route);
/**
* ipa_cmd_data_valid() - Validate command-realted configuration is valid
* @ipa: - IPA pointer
*
* Return: true if assumptions required for command are valid
*/
bool ipa_cmd_data_valid(struct ipa *ipa);
/**
* ipa_cmd_pool_init() - initialize command channel pools
* @channel: AP->IPA command TX GSI channel pointer
* @tre_count: Number of pool elements to allocate
*
* Return: 0 if successful, or a negative error code
*/
int ipa_cmd_pool_init(struct gsi_channel *channel, u32 tre_count);
/**
* ipa_cmd_pool_exit() - Inverse of ipa_cmd_pool_init()
* @channel: AP->IPA command TX GSI channel pointer
*/
void ipa_cmd_pool_exit(struct gsi_channel *channel);
/**
* ipa_cmd_table_init_add() - Add table init command to a transaction
* @trans: GSI transaction
* @opcode: IPA immediate command opcode
* @size: Size of non-hashed routing table memory
* @offset: Offset in IPA shared memory of non-hashed routing table memory
* @addr: DMA address of non-hashed table data to write
* @hash_size: Size of hashed routing table memory
* @hash_offset: Offset in IPA shared memory of hashed routing table memory
* @hash_addr: DMA address of hashed table data to write
*
* If hash_size is 0, hash_offset and hash_addr are ignored.
*/
void ipa_cmd_table_init_add(struct gsi_trans *trans, enum ipa_cmd_opcode opcode,
u16 size, u32 offset, dma_addr_t addr,
u16 hash_size, u32 hash_offset,
dma_addr_t hash_addr);
/**
* ipa_cmd_hdr_init_local_add() - Add a header init command to a transaction
* @trans: GSI transaction
* @offset: Offset of header memory in IPA local space
* @size: Size of header memory
* @addr: DMA address of buffer to be written from
*
* Defines and fills the location in IPA memory to use for headers.
*/
void ipa_cmd_hdr_init_local_add(struct gsi_trans *trans, u32 offset, u16 size,
dma_addr_t addr);
/**
* ipa_cmd_register_write_add() - Add a register write command to a transaction
* @trans: GSI transaction
* @offset: Offset of register to be written
* @value: Value to be written
* @mask: Mask of bits in register to update with bits from value
* @clear_full: Pipeline clear option; true means full pipeline clear
*/
void ipa_cmd_register_write_add(struct gsi_trans *trans, u32 offset, u32 value,
u32 mask, bool clear_full);
/**
* ipa_cmd_dma_shared_mem_add() - Add a DMA memory command to a transaction
* @trans: GSI transaction
* @offset: Offset of IPA memory to be read or written
* @size: Number of bytes of memory to be transferred
* @addr: DMA address of buffer to be read into or written from
* @toward_ipa: true means write to IPA memory; false means read
*/
void ipa_cmd_dma_shared_mem_add(struct gsi_trans *trans, u32 offset,
u16 size, dma_addr_t addr, bool toward_ipa);
/**
* ipa_cmd_pipeline_clear_add() - Add pipeline clear commands to a transaction
* @trans: GSI transaction
*/
void ipa_cmd_pipeline_clear_add(struct gsi_trans *trans);
/**
* ipa_cmd_pipeline_clear_count() - # commands required to clear pipeline
*
* Return: The number of elements to allocate in a transaction
* to hold commands to clear the pipeline
*/
u32 ipa_cmd_pipeline_clear_count(void);
/**
* ipa_cmd_pipeline_clear_wait() - Wait pipeline clear to complete
* @ipa: - IPA pointer
*/
void ipa_cmd_pipeline_clear_wait(struct ipa *ipa);
/**
* ipa_cmd_trans_alloc() - Allocate a transaction for the command TX endpoint
* @ipa: IPA pointer
* @tre_count: Number of elements in the transaction
*
* Return: A GSI transaction structure, or a null pointer if all
* available transactions are in use
*/
struct gsi_trans *ipa_cmd_trans_alloc(struct ipa *ipa, u32 tre_count);
/**
* ipa_cmd_init() - Initialize IPA immediate commands
* @ipa: - IPA pointer
*
* Return: 0 if successful, or a negative error code
*
* There is no need for a matching ipa_cmd_exit() function.
*/
int ipa_cmd_init(struct ipa *ipa);
#endif /* _IPA_CMD_H_ */
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