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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "xtensa/core-macros.h"
#include "soc/dport_reg.h"
#include "hli_api.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#if CONFIG_BTDM_CTRL_HLI
#define HLI_MAX_HANDLERS 4
typedef struct {
intr_handler_t handler;
void* arg;
uint32_t intr_reg;
uint32_t intr_mask;
} hli_handler_info_t;
typedef struct {
#define CUSTOMER_TYPE_REQUEST (0)
#define CUSTOMER_TYPE_RELEASE (1)
struct {
uint32_t cb_type;
union {
int (* request)(uint32_t, uint32_t, uint32_t);
int (* release)(uint32_t);
} cb;
} customer_cb;
uint32_t arg0, arg1, arg2;
} customer_swisr_t;
static void IRAM_ATTR customer_swisr_handle(customer_swisr_t *cus_swisr)
{
if (cus_swisr->customer_cb.cb_type == CUSTOMER_TYPE_REQUEST) {
if (cus_swisr->customer_cb.cb.request != NULL) {
cus_swisr->customer_cb.cb.request(cus_swisr->arg0, cus_swisr->arg1, cus_swisr->arg2);
}
} else if(cus_swisr->customer_cb.cb_type == CUSTOMER_TYPE_RELEASE) {
if (cus_swisr->customer_cb.cb.release != NULL) {
cus_swisr->customer_cb.cb.release(cus_swisr->arg0);
}
}
}
static DRAM_ATTR hli_handler_info_t s_hli_handlers[HLI_MAX_HANDLERS];
esp_err_t hli_intr_register(intr_handler_t handler, void* arg, uint32_t intr_reg, uint32_t intr_mask)
{
for (hli_handler_info_t* hip = s_hli_handlers;
hip < s_hli_handlers + HLI_MAX_HANDLERS;
++hip) {
if (hip->handler == NULL) {
hip->arg = arg;
hip->intr_reg = intr_reg;
hip->intr_mask = intr_mask;
hip->handler = handler; /* set last, indicates the entry as valid */
return ESP_OK;
}
}
return ESP_ERR_NO_MEM;
}
void IRAM_ATTR hli_c_handler(void)
{
bool handled = false;
/* Iterate over registered interrupt handlers,
* and check if the expected mask is present in the interrupt status register.
*/
for (hli_handler_info_t* hip = s_hli_handlers;
hip < s_hli_handlers + HLI_MAX_HANDLERS;
++hip) {
if (hip->handler == NULL) {
continue;
}
uint32_t reg = hip->intr_reg;
uint32_t val;
if (reg == 0) { /* special case for CPU internal interrupts */
val = XTHAL_GET_INTERRUPT();
} else {
/* "reg" might not be in DPORT, but this will work in any case */
val = DPORT_REG_READ(reg);
}
if ((val & hip->intr_mask) != 0) {
handled = true;
(*hip->handler)(hip->arg);
}
}
if (!handled) {
/* no handler found, it is OK in this case. */
}
}
uint32_t IRAM_ATTR hli_intr_disable(void)
{
/* disable level 4 and below */
return XTOS_SET_INTLEVEL(XCHAL_DEBUGLEVEL - 2);
}
void IRAM_ATTR hli_intr_restore(uint32_t state)
{
XTOS_RESTORE_JUST_INTLEVEL(state);
}
#define HLI_META_QUEUE_SIZE 16
#define HLI_QUEUE_MAX_ELEM_SIZE 32
#define HLI_QUEUE_SW_INT_NUM 29
#define HLI_QUEUE_FLAG_SEMAPHORE BIT(0)
#define HLI_QUEUE_FLAG_CUSTOMER BIT(1)
static DRAM_ATTR struct hli_queue_t *s_meta_queue_ptr = NULL;
static intr_handle_t ret_handle;
static inline char* IRAM_ATTR wrap_ptr(hli_queue_handle_t queue, char *ptr)
{
return (ptr == queue->bufend) ? queue->buf : ptr;
}
static inline bool IRAM_ATTR queue_empty(hli_queue_handle_t queue)
{
return queue->begin == queue->end;
}
static inline bool IRAM_ATTR queue_full(hli_queue_handle_t queue)
{
return wrap_ptr(queue, queue->end + queue->elem_size) == queue->begin;
}
static void IRAM_ATTR queue_isr_handler(void* arg)
{
int do_yield = pdFALSE;
XTHAL_SET_INTCLEAR(BIT(HLI_QUEUE_SW_INT_NUM));
hli_queue_handle_t queue;
while (hli_queue_get(s_meta_queue_ptr, &queue)) {
static DRAM_ATTR char scratch[HLI_QUEUE_MAX_ELEM_SIZE];
while (hli_queue_get(queue, scratch)) {
int res = pdPASS;
if ((queue->flags & HLI_QUEUE_FLAG_CUSTOMER) != 0) {
customer_swisr_handle((customer_swisr_t *)scratch);
} else if ((queue->flags & HLI_QUEUE_FLAG_SEMAPHORE) != 0) {
res = xSemaphoreGiveFromISR((SemaphoreHandle_t) queue->downstream, &do_yield);
} else {
res = xQueueSendFromISR(queue->downstream, scratch, &do_yield);
}
if (res == pdFAIL) {
/* Failed to send to downstream queue, it is OK in this case. */
}
}
}
if (do_yield) {
portYIELD_FROM_ISR();
}
}
/* Notify the level 3 handler that an element is added to the given hli queue.
* Do this by placing the queue handle onto s_meta_queue, and raising a SW interrupt.
*
* This function must be called with HL interrupts disabled!
*/
static void IRAM_ATTR queue_signal(hli_queue_handle_t queue)
{
/* See if the queue is already in s_meta_queue, before adding */
bool found = false;
const hli_queue_handle_t *end = (hli_queue_handle_t*) s_meta_queue_ptr->end;
hli_queue_handle_t *item = (hli_queue_handle_t*) s_meta_queue_ptr->begin;
for (;item != end; item = (hli_queue_handle_t*) wrap_ptr(s_meta_queue_ptr, (char*) (item + 1))) {
if (*item == queue) {
found = true;
break;
}
}
if (!found) {
bool res = hli_queue_put(s_meta_queue_ptr, &queue);
if (!res) {
esp_rom_printf(DRAM_STR("Fatal error in queue_signal: s_meta_queue full\n"));
abort();
}
XTHAL_SET_INTSET(BIT(HLI_QUEUE_SW_INT_NUM));
}
}
static void queue_init(hli_queue_handle_t queue, size_t buf_size, size_t elem_size, QueueHandle_t downstream)
{
queue->elem_size = elem_size;
queue->begin = queue->buf;
queue->end = queue->buf;
queue->bufend = queue->buf + buf_size;
queue->downstream = downstream;
queue->flags = 0;
}
void hli_queue_setup(void)
{
if (s_meta_queue_ptr == NULL) {
s_meta_queue_ptr = hli_queue_create(HLI_META_QUEUE_SIZE, sizeof(void*), NULL);
ESP_ERROR_CHECK(esp_intr_alloc(ETS_INTERNAL_SW1_INTR_SOURCE, ESP_INTR_FLAG_IRAM, queue_isr_handler, NULL, &ret_handle));
xt_ints_on(BIT(HLI_QUEUE_SW_INT_NUM));
}
}
void hli_queue_shutdown(void)
{
if (s_meta_queue_ptr != NULL) {
hli_queue_delete(s_meta_queue_ptr);
s_meta_queue_ptr = NULL;
esp_intr_free(ret_handle);
xt_ints_off(BIT(HLI_QUEUE_SW_INT_NUM));
}
}
hli_queue_handle_t hli_queue_create(size_t nelem, size_t elem_size, QueueHandle_t downstream)
{
const size_t buf_elem = nelem + 1;
if (elem_size > HLI_QUEUE_MAX_ELEM_SIZE) {
return NULL;
}
size_t buf_size = buf_elem * elem_size;
hli_queue_handle_t res = (hli_queue_handle_t) heap_caps_malloc(sizeof(struct hli_queue_t) + buf_size,
MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
if (res == NULL) {
return NULL;
}
queue_init(res, buf_size, elem_size, downstream);
return res;
}
hli_queue_handle_t hli_customer_queue_create(size_t nelem, size_t elem_size, QueueHandle_t downstream)
{
hli_queue_handle_t res = hli_queue_create(nelem, elem_size, (QueueHandle_t) downstream);
if (res == NULL) {
return NULL;
}
res->flags |= HLI_QUEUE_FLAG_CUSTOMER;
return res;
}
hli_queue_handle_t hli_semaphore_create(size_t max_count, SemaphoreHandle_t downstream)
{
const size_t elem_size = 1;
hli_queue_handle_t res = hli_queue_create(max_count, elem_size, (QueueHandle_t) downstream);
if (res == NULL) {
return NULL;
}
res->flags |= HLI_QUEUE_FLAG_SEMAPHORE;
return res;
}
void hli_queue_delete(hli_queue_handle_t queue)
{
free(queue);
}
bool IRAM_ATTR hli_queue_get(hli_queue_handle_t queue, void* out)
{
uint32_t int_state = hli_intr_disable();
bool res = false;
if (!queue_empty(queue)) {
memcpy(out, queue->begin, queue->elem_size);
queue->begin = wrap_ptr(queue, queue->begin + queue->elem_size);
res = true;
}
hli_intr_restore(int_state);
return res;
}
bool IRAM_ATTR hli_queue_put(hli_queue_handle_t queue, const void* data)
{
uint32_t int_state = hli_intr_disable();
bool res = false;
bool was_empty = queue_empty(queue);
if (!queue_full(queue)) {
memcpy(queue->end, data, queue->elem_size);
queue->end = wrap_ptr(queue, queue->end + queue->elem_size);
if (was_empty && queue != s_meta_queue_ptr) {
queue_signal(queue);
}
res = true;
}
hli_intr_restore(int_state);
return res;
}
bool IRAM_ATTR hli_semaphore_give(hli_queue_handle_t queue)
{
uint8_t data = 0;
return hli_queue_put(queue, &data);
}
#endif /* CONFIG_BTDM_CTRL_HLI */
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