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/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "hardware/sync.h"
#include "hardware/claim.h"
static_assert(PICO_SPINLOCK_ID_STRIPED_LAST >= PICO_SPINLOCK_ID_STRIPED_FIRST, "");
static uint8_t striped_spin_lock_num = PICO_SPINLOCK_ID_STRIPED_FIRST;
static uint32_t claimed;
static void check_lock_num(uint __unused lock_num) {
invalid_params_if(SYNC, lock_num >= 32);
}
void spin_locks_reset(void) {
for (uint i = 0; i < NUM_SPIN_LOCKS; i++) {
spin_unlock_unsafe(spin_lock_instance(i));
}
}
spin_lock_t *spin_lock_init(uint lock_num) {
assert(lock_num < NUM_SPIN_LOCKS);
spin_lock_t *lock = spin_lock_instance(lock_num);
spin_unlock_unsafe(lock);
return lock;
}
uint next_striped_spin_lock_num() {
uint rc = striped_spin_lock_num++;
if (striped_spin_lock_num > PICO_SPINLOCK_ID_STRIPED_LAST) {
striped_spin_lock_num = PICO_SPINLOCK_ID_STRIPED_FIRST;
}
return rc;
}
void spin_lock_claim(uint lock_num) {
check_lock_num(lock_num);
hw_claim_or_assert((uint8_t *) &claimed, lock_num, "Spinlock %d is already claimed");
}
void spin_lock_claim_mask(uint32_t mask) {
for(uint i = 0; mask; i++, mask >>= 1u) {
if (mask & 1u) spin_lock_claim(i);
}
}
void spin_lock_unclaim(uint lock_num) {
check_lock_num(lock_num);
spin_unlock_unsafe(spin_lock_instance(lock_num));
hw_claim_clear((uint8_t *) &claimed, lock_num);
}
int spin_lock_claim_unused(bool required) {
return hw_claim_unused_from_range((uint8_t*)&claimed, required, PICO_SPINLOCK_ID_CLAIM_FREE_FIRST, PICO_SPINLOCK_ID_CLAIM_FREE_LAST, "No spinlocks are available");
}
bool spin_lock_is_claimed(uint lock_num) {
check_lock_num(lock_num);
return hw_is_claimed((uint8_t *) &claimed, lock_num);
}
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