renesas-ra: Add RNG driver.

It needs to be enabled explicitly by a board.

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

ports/renesas-ra/Makefile

@@ -303,6 +303,7 @@ SRC_C += \
 	main.c \
 	ra_hal.c \
 	ra_it.c \
+	rng.c \
 	mphalport.c \
 	mpthreadport.c \
 	irq.c \
@@ -429,6 +430,43 @@ HAL_SRC_C += $(addprefix ra/,\
 
 endif
 
+ifeq ($(MICROPY_HW_ENABLE_RNG),1)
+CRYPTO_DIR = ra/fsp/src/r_sce_protected/crypto_procedures_protected/src/sce9/
+
+INC += -I$(TOP)/$(HAL_DIR)/$(CRYPTO_DIR)/inc
+INC += -I$(TOP)/$(HAL_DIR)/$(CRYPTO_DIR)/inc/api
+INC += -I$(TOP)/$(HAL_DIR)/$(CRYPTO_DIR)/private/inc
+INC += -I$(TOP)/$(HAL_DIR)/$(CRYPTO_DIR)/inc/instances
+
+# The following FSP files are required for the random number generator.
+HAL_SRC_C += $(addprefix $(HAL_DIR)/$(CRYPTO_DIR)/,\
+	public/r_sce.c \
+	public/r_sce_ecc.c \
+	public/r_sce_sha.c \
+	public/r_sce_aes.c \
+	private/r_sce_private.c \
+	primitive/r_sce_p00.c \
+	primitive/r_sce_p20.c \
+	primitive/r_sce_p26.c \
+	primitive/r_sce_p81.c \
+	primitive/r_sce_p82.c \
+	primitive/r_sce_p92.c \
+	primitive/r_sce_p40.c \
+	primitive/r_sce_func050.c \
+	primitive/r_sce_func051.c \
+	primitive/r_sce_func052.c \
+	primitive/r_sce_func053.c \
+	primitive/r_sce_func054.c \
+	primitive/r_sce_func100.c \
+	primitive/r_sce_func101.c \
+	primitive/r_sce_func040.c \
+	primitive/r_sce_func048.c \
+	primitive/r_sce_func102.c \
+	primitive/r_sce_func103.c \
+	primitive/r_sce_subprc01.c\
+	)
+endif
+
 OBJ += $(PY_O)
 OBJ += $(addprefix $(BUILD)/, $(LIB_SRC_C:.c=.o))
 OBJ += $(LIBM_O)

ports/renesas-ra/modos.c

@@ -27,6 +27,7 @@
 
 #include "py/runtime.h"
 #include "uart.h"
+#include "rng.h"
 
 bool mp_os_dupterm_is_builtin_stream(mp_const_obj_t stream) {
     const mp_obj_type_t *type = mp_obj_get_type(stream);
@@ -42,3 +43,16 @@ void mp_os_dupterm_stream_detached_attached(mp_obj_t stream_detached, mp_obj_t s
         uart_attach_to_repl(MP_OBJ_TO_PTR(stream_attached), true);
     }
 }
+
+#if MICROPY_PY_OS_URANDOM
+STATIC mp_obj_t mp_os_urandom(mp_obj_t num) {
+    mp_int_t n = mp_obj_get_int(num);
+    vstr_t vstr;
+    vstr_init_len(&vstr, n);
+    for (int i = 0; i < n; i++) {
+        vstr.buf[i] = rng_read();
+    }
+    return mp_obj_new_bytes_from_vstr(&vstr);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_os_urandom_obj, mp_os_urandom);
+#endif

ports/renesas-ra/rng.c

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023 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.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "py/runtime.h"
+#include "py/mphal.h"
+
+#if MICROPY_HW_ENABLE_RNG
+
+#include "rng.h"
+#include "r_sce.h"
+
+uint32_t rng_read(void) {
+    uint32_t random_data[4];
+    static bool initialized = false;
+
+    if (initialized == false) {
+        initialized = true;
+        R_SCE_Open(&sce_ctrl, &sce_cfg);
+    }
+
+    R_SCE_RandomNumberGenerate(random_data);
+
+    return random_data[0];
+}
+
+#endif

ports/renesas-ra/rng.h

@@ -0,0 +1,34 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023 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.
+ */
+
+#ifndef MICROPY_INCLUDED_RENESAS_RA_RNG_H
+#define MICROPY_INCLUDED_RENESAS_RA_RNG_H
+
+#include <stdint.h>
+
+uint32_t rng_read(void);
+
+#endif // MICROPY_INCLUDED_RENESAS_RA_RNG_H