Add RNG driver

.github/workflows/build.yml

@@ -3,10 +3,10 @@ name: Build
 on:
   pull_request:
     types:
-    - edited
-    - opened
-    - reopened
-    - synchronize
+      - edited
+      - opened
+      - reopened
+      - synchronize
 
 jobs:
   build:
@@ -16,34 +16,52 @@ jobs:
         os: [ubuntu-22.04, macos-14, windows-2022]
     runs-on: ${{ matrix.os }}
     steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-      with:
-        path: zephyr-silabs
-
-    - name: Set up Python
-      uses: actions/setup-python@v5
-      with:
-        python-version: 3.11
-
-    - name: Setup Zephyr project
-      uses: zephyrproject-rtos/action-zephyr-setup@v1
-      with:
-        app-path: zephyr-silabs
-        toolchains: arm-zephyr-eabi
-
-    - name: Fetch blobs
-      run: |
-        west blobs fetch hal_silabs
-
-    - name: Build hello world
-      working-directory: zephyr-silabs
-      shell: bash
-      run: |
-        if [ "${{ runner.os }}" = "Windows" ]; then
-          EXTRA_TWISTER_FLAGS="--short-build-path -O/tmp/twister-out"
-        fi
-        west twister --test sample.basic.helloworld -p siwx917_rb4338a -v --inline-logs $EXTRA_TWISTER_FLAGS
-        west twister --test sample.net.wifi -p siwx917_rb4338a -v --inline-logs -K $EXTRA_TWISTER_FLAGS
-        west twister --test sample.bluetooth.peripheral_hr -p siwx917_rb4338a -v --inline-logs -K $EXTRA_TWISTER_FLAGS
-        west twister --test sample.rail.simple_txrx -T samples -v --inline-logs $EXTRA_TWISTER_FLAGS
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: zephyr-silabs
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Setup Zephyr project
+        uses: zephyrproject-rtos/action-zephyr-setup@v1
+        with:
+          app-path: zephyr-silabs
+          toolchains: arm-zephyr-eabi
+
+      - name: Fetch blobs
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west blobs fetch hal_silabs
+
+      - name: Build Entropy test
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s drivers.entropy -p siwx917_rb4338a -v --inline-logs
+
+      - name: Build Bluetooth samples
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s sample.bluetooth.peripheral_hr -p siwx917_rb4338a -v --inline-logs -K
+
+      - name: Build Rail samples
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s sample.rail.simple_txrx -T samples -v --inline-logs
+
+      - name: Build Wifi samples
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s sample.net.wifi -p siwx917_rb4338a -v --inline-logs -K

.github/workflows/upstream-build.yml

@@ -36,23 +36,38 @@ jobs:
           sed s/$Z_REV/main/ west.yml > west.yml.new
           mv west.yml.new west.yml
           west update
+
+      - name: Fetch blobs
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
           west blobs fetch hal_silabs
 
-      - name: Build Bluetooth sample for xG27
+      - name: Build Entropy test
         continue-on-error: true
         working-directory: zephyr-silabs
         shell: bash
         run: |
-          west twister -K -p xg27_dk2602a --test sample.bluetooth.peripheral_hr
+          west twister -s drivers.entropy -p siwx917_rb4338a -v --inline-logs -K
 
-      - name: Build hello world for siwx917_rb4338a
+      - name: Build Bluetooth samples
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s sample.bluetooth.peripheral_hr -p xg27_dk2602a -v --inline-logs -K
+          west twister -s sample.bluetooth.peripheral_hr -p siwx917_rb4338a -v --inline-logs -K
+
+      - name: Build Rail samples
+        continue-on-error: true
+        working-directory: zephyr-silabs
+        shell: bash
+        run: |
+          west twister -s sample.rail.simple_txrx -T samples -v --inline-logs
+
+      - name: Build Wifi samples
+        continue-on-error: true
         working-directory: zephyr-silabs
         shell: bash
         run: |
-          if [ "${{ runner.os }}" = "Windows" ]; then
-            EXTRA_TWISTER_FLAGS="--short-build-path -O/tmp/twister-out"
-          fi
-          west twister -T ../zephyr/samples -s sample.basic.helloworld -p siwx917_rb4338a -v --inline-logs $EXTRA_TWISTER_FLAGS
-          west twister -T ../zephyr/samples -s sample.net.wifi -p siwx917_rb4338a -v --inline-logs -K $EXTRA_TWISTER_FLAGS
-          west twister -T ../zephyr/samples -s sample.bluetooth.peripheral_hr -p siwx917_rb4338a -v --inline-logs -K $EXTRA_TWISTER_FLAGS
-          west twister -T samples           -s sample.rail.simple_txrx -v --inline-logs $EXTRA_TWISTER_FLAGS
+          west twister -s sample.net.wifi -p siwx917_rb4338a -v --inline-logs -K

drivers/CMakeLists.txt

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 add_subdirectory(bluetooth)
+add_subdirectory(entropy)
 add_subdirectory(gpio)
 add_subdirectory(pinctrl)
 add_subdirectory(wifi)

drivers/entropy/CMakeLists.txt

@@ -0,0 +1,5 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library_amend()
+zephyr_library_sources_ifdef(CONFIG_ENTROPY_SILABS_SIWX917 entropy_silabs_siwx917.c)

drivers/entropy/Kconfig

@@ -0,0 +1,8 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+if ENTROPY_GENERATOR
+
+rsource "Kconfig.siwx917"
+
+endif

drivers/entropy/Kconfig.siwx917

@@ -0,0 +1,11 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config ENTROPY_SILABS_SIWX917
+	bool "SiWx917 RNG driver"
+	default y
+	depends on DT_HAS_SILABS_SIWX917_RNG_ENABLED
+	select ENTROPY_HAS_DRIVER
+	help
+	 Enable hardware Random Number Generator embedded on Silicon Labs
+	 SiWx917 chips.

drivers/entropy/entropy_silabs_siwx917.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#define DT_DRV_COMPAT silabs_siwx917_rng
+
+#include <zephyr/drivers/entropy.h>
+
+#include "rsi_rom_rng.h"
+#include "rsi_rom_clks.h"
+
+static int siwx917_get_entropy_isr(const struct device *dev, uint8_t *buffer,
+				   uint16_t length, uint32_t flags)
+{
+	uint32_t u32_count = length / sizeof(uint32_t);
+	uint32_t u8_count = u32_count * sizeof(uint32_t);
+	uint32_t u8_remainder = length - u8_count;
+	uint32_t swap_space;
+
+	if (!(flags & ENTROPY_BUSYWAIT)) {
+		return -ENOTSUP;
+	}
+	RSI_RNG_GetBytes((void *)dev->config, (uint32_t *)buffer, u32_count);
+	if (length % sizeof(uint32_t)) {
+		RSI_RNG_GetBytes((void *)dev->config, &swap_space, 1);
+		memcpy(buffer + u8_count, &swap_space, u8_remainder);
+	}
+
+	return 0;
+}
+
+static int siwx917_get_entropy(const struct device *dev, uint8_t *buffer, uint16_t length)
+{
+	return siwx917_get_entropy_isr(dev, buffer, length, ENTROPY_BUSYWAIT);
+}
+
+static int siwx917_init(const struct device *dev)
+{
+	int ret;
+
+	ret = RSI_CLK_PeripheralClkEnable1(M4CLK, HWRNG_PCLK_ENABLE);
+	if (ret) {
+		return -EIO;
+	}
+	ret = RSI_RNG_Start((void *)dev->config, RSI_RNG_TRUE_RANDOM);
+	if (ret) {
+		return -EIO;
+	}
+	return 0;
+}
+
+static const struct entropy_driver_api siwx917_api = {
+	.get_entropy = siwx917_get_entropy,
+	.get_entropy_isr = siwx917_get_entropy_isr,
+};
+
+#define SIWX917_RNG_INIT(idx)                                                               \
+	DEVICE_DT_INST_DEFINE(idx, siwx917_init, NULL, NULL, (void *)DT_INST_REG_ADDR(idx), \
+			      PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY, &siwx917_api);
+
+DT_INST_FOREACH_STATUS_OKAY(SIWX917_RNG_INIT)

dts/arm/silabs/siwg917.dtsi

@@ -9,6 +9,10 @@
 #include <zephyr/dt-bindings/spi/spi.h>
 
 / {
+	chosen {
+		zephyr,entropy = &rng0;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -202,6 +206,11 @@
 			interrupt-names = "i2c2";
 			status = "disabled";
 		};
+
+		rng0: rng@45090000 {
+			compatible = "silabs,siwx917-rng";
+			reg = <0x45090000 0x8>;
+		};
 	};
 };
 

dts/bindings/rng/silabs,siwx917-rng.yaml

@@ -0,0 +1,12 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Hardware Random Number Generator embedded on Silabs SiWx917 chips
+
+compatible: "silabs,siwx917-rng"
+
+include: base.yaml
+
+properties:
+  reg:
+    required: true

west.yml

@@ -11,7 +11,7 @@ manifest:
   projects:
     - name: hal_silabs
       remote: silabs
-      revision: 2eb82930b376900f1b6949e218199ab33ba6f34c
+      revision: ca720524a33c4bb55446ceb7e94502e37153d941
       path: modules/hal/silabs
     - name: zephyr
       remote: zephyrproject-rtos