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103 lines
4.1 KiB
C
103 lines
4.1 KiB
C
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/*
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The cache has an interrupt that can be raised as soon as an access to a cached
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region (flash) is done without the cache being enabled. We use that here
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to panic the CPU, which from a debugging perspective is better than grabbing bad
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data from the bus.
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*/
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#include "esp32c3/rom/ets_sys.h"
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#include "esp_attr.h"
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#include "esp_intr_alloc.h"
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#include "soc/extmem_reg.h"
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#include "soc/periph_defs.h"
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#include "riscv/interrupt.h"
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void esp_cache_err_int_init(void)
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{
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const uint32_t core_id = 0;
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/* Disable cache interrupts if enabled. */
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ESP_INTR_DISABLE(ETS_CACHEERR_INUM);
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/**
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* Bind all cache errors to ETS_CACHEERR_INUM interrupt. we will deal with
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* them in handler by different types
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* I) Cache access error
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* 1. dbus trying to write to icache
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* 2. dbus authentication fail
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* 3. cpu access icache while dbus is disabled [1]
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* 4. ibus authentication fail
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* 5. ibus trying to write icache
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* 6. cpu access icache while ibus is disabled
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* II) Cache illegal error
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* 1. dbus counter overflow
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* 2. ibus counter overflow
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* 3. mmu entry fault
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* 4. icache preload configurations fault
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* 5. icache sync configuration fault
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*
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* [1]: On ESP32C3 boards, the caches are shared but buses are still
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* distinct. So, we have an ibus and a dbus sharing the same cache.
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* This error can occur if the dbus performs a request but the icache
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* (or simply cache) is disabled.
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*/
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intr_matrix_set(core_id, ETS_CACHE_IA_INTR_SOURCE, ETS_CACHEERR_INUM);
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intr_matrix_set(core_id, ETS_CACHE_CORE0_ACS_INTR_SOURCE, ETS_CACHEERR_INUM);
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/* Set the type and priority to cache error interrupts. */
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esprv_intc_int_set_type(ETS_CACHEERR_INUM, INTR_TYPE_LEVEL);
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esprv_intc_int_set_priority(ETS_CACHEERR_INUM, SOC_INTERRUPT_LEVEL_MEDIUM);
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/* On the hardware side, stat by clearing all the bits reponsible for
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* enabling cache access error interrupts. */
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SET_PERI_REG_MASK(EXTMEM_CORE0_ACS_CACHE_INT_CLR_REG,
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EXTMEM_CORE0_DBUS_WR_IC_INT_CLR |
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EXTMEM_CORE0_DBUS_REJECT_INT_CLR |
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EXTMEM_CORE0_DBUS_ACS_MSK_IC_INT_CLR |
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EXTMEM_CORE0_IBUS_REJECT_INT_CLR |
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EXTMEM_CORE0_IBUS_WR_IC_INT_CLR |
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EXTMEM_CORE0_IBUS_ACS_MSK_IC_INT_CLR);
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/* Enable these interrupts. */
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SET_PERI_REG_MASK(EXTMEM_CORE0_ACS_CACHE_INT_ENA_REG,
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EXTMEM_CORE0_DBUS_WR_IC_INT_ENA |
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EXTMEM_CORE0_DBUS_REJECT_INT_ENA |
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EXTMEM_CORE0_DBUS_ACS_MSK_IC_INT_ENA |
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EXTMEM_CORE0_IBUS_REJECT_INT_ENA |
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EXTMEM_CORE0_IBUS_WR_IC_INT_ENA |
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EXTMEM_CORE0_IBUS_ACS_MSK_IC_INT_ENA);
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/* Same goes for cache illegal error: start by clearing the bits and then
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* set them back. */
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SET_PERI_REG_MASK(EXTMEM_CACHE_ILG_INT_CLR_REG,
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EXTMEM_MMU_ENTRY_FAULT_INT_CLR |
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EXTMEM_ICACHE_PRELOAD_OP_FAULT_INT_CLR |
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EXTMEM_ICACHE_SYNC_OP_FAULT_INT_CLR);
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SET_PERI_REG_MASK(EXTMEM_CACHE_ILG_INT_ENA_REG,
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EXTMEM_MMU_ENTRY_FAULT_INT_ENA |
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EXTMEM_ICACHE_PRELOAD_OP_FAULT_INT_ENA |
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EXTMEM_ICACHE_SYNC_OP_FAULT_INT_ENA);
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/* Enable the interrupts for cache error. */
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ESP_INTR_ENABLE(ETS_CACHEERR_INUM);
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}
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int IRAM_ATTR esp_cache_err_get_cpuid(void)
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{
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return 0;
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}
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