stm32: Implement port backend for OpenAMP's remoteproc.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

ports/stm32/Makefile

@@ -427,6 +427,10 @@ endif # MICROPY_PY_BLUETOOTH
 ifeq ($(MICROPY_PY_OPENAMP),1)
 SRC_C += mpmetalport.c
 $(BUILD)/mpmetalport.o: $(BUILD)/openamp/metal/config.h
+ifeq ($(MICROPY_PY_OPENAMP_REMOTEPROC),1)
+SRC_C += mpremoteprocport.c
+$(BUILD)/mpremoteprocport.o: $(BUILD)/openamp/metal/config.h
+endif
 endif
 
 # SRC_O should be placed first to work around this LTO bug with binutils <2.35:

ports/stm32/mpremoteprocport.c

@@ -0,0 +1,153 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023-2024 Arduino SA
+ *
+ * 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
+ * AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * modremoteproc stm32 port.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "metal/alloc.h"
+#include "metal/errno.h"
+#include "metal/io.h"
+#include "metal/sys.h"
+#include "metal/device.h"
+#include "metal/utilities.h"
+#include "extmod/modopenamp_remoteproc.h"
+
+#define DEBUG_printf(...)   // mp_printf(&mp_plat_print, __VA_ARGS__)
+
+struct remoteproc *mp_openamp_remoteproc_init(struct remoteproc *rproc,
+    const struct remoteproc_ops *ops, void *arg) {
+    DEBUG_printf("rproc_init()\n");
+
+    rproc->ops = ops;
+    rproc->state = RPROC_OFFLINE;
+    // Allocate the image store and save it in private data.
+    rproc->priv = mp_openamp_remoteproc_store_alloc();
+    return rproc;
+}
+
+void *mp_openamp_remoteproc_mmap(struct remoteproc *rproc, metal_phys_addr_t *pa,
+    metal_phys_addr_t *da, size_t size, unsigned int attribute,
+    struct metal_io_region **io) {
+    DEBUG_printf("rproc_mmap(): pa 0x%p da 0x%p io 0x%p size %u\n", *pa, *da, *io, size);
+
+    struct remoteproc_mem *mem;
+    metal_phys_addr_t lpa = *pa;
+    metal_phys_addr_t lda = *da;
+
+    if (lda == METAL_BAD_PHYS) {
+        return NULL;
+    }
+
+    if (lpa == METAL_BAD_PHYS) {
+        lpa = lda;
+    }
+
+    // Currently this port doesn't support loading firmware to flash,
+    // only SD/SRAM images are supported. Check of load address is in
+    // the flash region, and if so return NULL.
+    if (lda >= FLASH_BASE && lda < FLASH_END) {
+        return NULL;
+    }
+
+    mem = metal_allocate_memory(sizeof(*mem));
+    if (!mem) {
+        return NULL;
+    }
+
+    *io = metal_allocate_memory(sizeof(struct metal_io_region));
+    if (!*io) {
+        metal_free_memory(mem);
+        return NULL;
+    }
+
+    remoteproc_init_mem(mem, NULL, lpa, lda, size, *io);
+
+    metal_io_init(*io, (void *)mem->da, &mem->pa, size,
+        sizeof(metal_phys_addr_t) << 3, attribute, NULL);
+
+    remoteproc_add_mem(rproc, mem);
+    *pa = lpa;
+    *da = lda;
+    return metal_io_phys_to_virt(*io, mem->pa);
+}
+
+int mp_openamp_remoteproc_start(struct remoteproc *rproc) {
+    DEBUG_printf("rproc_start()\n");
+    if ((RCC->GCR & RCC_GCR_BOOT_C2) || (FLASH->OPTSR_CUR & FLASH_OPTSR_BCM4)) {
+        // The CM4 core has already been started manually, or auto-boot is enabled
+        // via the option bytes, in either case the core can't be restarted.
+        DEBUG_printf("rproc_start(): CM4 core is already booted.\n");
+        return -1;
+    }
+
+    // Flush M7 cache.
+    struct metal_list *node;
+    metal_list_for_each(&rproc->mems, node) {
+        struct remoteproc_mem *mem;
+        mem = metal_container_of(node, struct remoteproc_mem, node);
+        SCB_CleanDCache_by_Addr((uint32_t *)mem->pa, mem->size);
+    }
+
+    HAL_SYSCFG_CM4BootAddConfig(SYSCFG_BOOT_ADDR0, (uint32_t)rproc->bootaddr);
+    HAL_RCCEx_EnableBootCore(RCC_BOOT_C2);
+    return 0;
+}
+
+int mp_openamp_remoteproc_stop(struct remoteproc *rproc) {
+    DEBUG_printf("rproc_stop()\n");
+    if (rproc->state == RPROC_RUNNING) {
+        // There's no straightforward way to reset or shut down
+        // the remote processor, so a full system reset is needed.
+        NVIC_SystemReset();
+    }
+    return 0;
+}
+
+int mp_openamp_remoteproc_config(struct remoteproc *rproc, void *data) {
+    DEBUG_printf("rproc_config()\n");
+    (void)rproc;
+    return 0;
+}
+
+void mp_openamp_remoteproc_remove(struct remoteproc *rproc) {
+    DEBUG_printf("rproc_remove()\n");
+    (void)rproc;
+}
+
+int mp_openamp_remoteproc_shutdown(struct remoteproc *rproc) {
+    DEBUG_printf("rproc_shutdown()\n");
+    if (rproc->state == RPROC_RUNNING) {
+        // There's no straightforward way to reset or shut down
+        // the remote processor, so a full system reset is needed.
+        NVIC_SystemReset();
+    }
+    return 0;
+}