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/*
* Copyright 2019 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
#ifndef _DMUB_RB_H_
#define _DMUB_RB_H_
#include "dmub_types.h"
#include "dmub_cmd.h"
#if defined(__cplusplus)
extern "C" {
#endif
struct dmub_cmd_header;
struct dmub_rb_init_params {
void *ctx;
void *base_address;
uint32_t capacity;
};
struct dmub_rb {
void *base_address;
uint32_t data_count;
uint32_t rptr;
uint32_t wrpt;
uint32_t capacity;
void *ctx;
void *dmub;
};
static inline bool dmub_rb_empty(struct dmub_rb *rb)
{
return (rb->wrpt == rb->rptr);
}
static inline bool dmub_rb_full(struct dmub_rb *rb)
{
uint32_t data_count;
if (rb->wrpt >= rb->rptr)
data_count = rb->wrpt - rb->rptr;
else
data_count = rb->capacity - (rb->rptr - rb->wrpt);
return (data_count == (rb->capacity - DMUB_RB_CMD_SIZE));
}
static inline bool dmub_rb_push_front(struct dmub_rb *rb,
const struct dmub_cmd_header *cmd)
{
uint64_t volatile *dst = (uint64_t volatile *)(rb->base_address) + rb->wrpt / sizeof(uint64_t);
const uint64_t *src = (const uint64_t *)cmd;
int i;
if (dmub_rb_full(rb))
return false;
// copying data
for (i = 0; i < DMUB_RB_CMD_SIZE / sizeof(uint64_t); i++)
*dst++ = *src++;
rb->wrpt += DMUB_RB_CMD_SIZE;
if (rb->wrpt >= rb->capacity)
rb->wrpt %= rb->capacity;
return true;
}
static inline bool dmub_rb_front(struct dmub_rb *rb,
struct dmub_cmd_header *cmd)
{
uint8_t *rd_ptr = (uint8_t *)rb->base_address + rb->rptr;
if (dmub_rb_empty(rb))
return false;
dmub_memcpy(cmd, rd_ptr, DMUB_RB_CMD_SIZE);
return true;
}
static inline bool dmub_rb_pop_front(struct dmub_rb *rb)
{
if (dmub_rb_empty(rb))
return false;
rb->rptr += DMUB_RB_CMD_SIZE;
if (rb->rptr >= rb->capacity)
rb->rptr %= rb->capacity;
return true;
}
static inline void dmub_rb_flush_pending(const struct dmub_rb *rb)
{
uint32_t rptr = rb->rptr;
uint32_t wptr = rb->wrpt;
while (rptr != wptr) {
uint64_t volatile *data = (uint64_t volatile *)rb->base_address + rptr / sizeof(uint64_t);
//uint64_t volatile *p = (uint64_t volatile *)data;
uint64_t temp;
int i;
for (i = 0; i < DMUB_RB_CMD_SIZE / sizeof(uint64_t); i++)
temp = *data++;
rptr += DMUB_RB_CMD_SIZE;
if (rptr >= rb->capacity)
rptr %= rb->capacity;
}
}
static inline void dmub_rb_init(struct dmub_rb *rb,
struct dmub_rb_init_params *init_params)
{
rb->base_address = init_params->base_address;
rb->capacity = init_params->capacity;
rb->rptr = 0;
rb->wrpt = 0;
}
#if defined(__cplusplus)
}
#endif
#endif /* _DMUB_RB_H_ */