add esp32s2beta component

components/esp32s2beta/cache_err_int.c

@@ -0,0 +1,69 @@
+// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+ The cache has an interrupt that can be raised as soon as an access to a cached
+ region (flash, psram) is done without the cache being enabled. We use that here
+ to panic the CPU, which from a debugging perspective is better than grabbing bad
+ data from the bus.
+*/
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "freertos/FreeRTOS.h"
+#include "esp_err.h"
+#include "esp_intr_alloc.h"
+#include "esp_attr.h"
+#include "soc/dport_reg.h"
+#include "soc/periph_defs.h"
+#include "sdkconfig.h"
+#include "esp32s2beta/dport_access.h"
+
+void esp_cache_err_int_init()
+{
+    uint32_t core_id = xPortGetCoreID();
+    ESP_INTR_DISABLE(ETS_CACHEERR_INUM);
+
+    // We do not register a handler for the interrupt because it is interrupt
+    // level 4 which is not serviceable from C. Instead, xtensa_vectors.S has
+    // a call to the panic handler for
+    // this interrupt.
+    intr_matrix_set(core_id, ETS_CACHE_IA_INTR_SOURCE, ETS_CACHEERR_INUM);
+
+    // Enable invalid cache access interrupt when the cache is disabled.
+    // When the interrupt happens, we can not determine the CPU where the
+    // invalid cache access has occurred. We enable the interrupt to catch
+    // invalid access on both CPUs, but the interrupt is connected to the
+    // CPU which happens to call this function.
+    // For this reason, panic handler backtrace will not be correct if the
+    // interrupt is connected to PRO CPU and invalid access happens on the APP
+    // CPU.
+#if 0
+    DPORT_SET_PERI_REG_MASK(DPORT_PRO_CACHE_IA_INT_EN_REG,
+        DPORT_CACHE_IA_INT_PRO_DRAM1 |
+        DPORT_CACHE_IA_INT_PRO_DROM0 |
+        DPORT_CACHE_IA_INT_PRO_IROM0 |
+        DPORT_CACHE_IA_INT_PRO_IRAM0 |
+        DPORT_CACHE_IA_INT_PRO_IRAM1);
+#endif
+    ESP_INTR_ENABLE(ETS_CACHEERR_INUM);
+}
+
+int IRAM_ATTR esp_cache_err_get_cpuid()
+{
+    esp_dport_access_int_pause();
+    return PRO_CPU_NUM;
+}