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@@ -0,0 +1,112 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright (c) 2019, Linaro Limited
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <efi_loader.h>
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+#include <efi_rng.h>
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+#include <rng.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+__weak efi_status_t platform_get_rng_device(struct udevice **dev)
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+{
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+ int ret;
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+ struct udevice *devp;
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+
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+ ret = uclass_get_device(UCLASS_RNG, 0, &devp);
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+ if (ret) {
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+ debug("Unable to get rng device\n");
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+ return EFI_DEVICE_ERROR;
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+ }
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+
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+ *dev = devp;
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+
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+ return EFI_SUCCESS;
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+}
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+
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+static efi_status_t EFIAPI rng_getinfo(struct efi_rng_protocol *this,
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+ efi_uintn_t *rng_algorithm_list_size,
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+ efi_guid_t *rng_algorithm_list)
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+{
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+ efi_status_t ret = EFI_SUCCESS;
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+ efi_guid_t rng_algo_guid = EFI_RNG_ALGORITHM_RAW;
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+
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+ EFI_ENTRY("%p, %p, %p", this, rng_algorithm_list_size,
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+ rng_algorithm_list);
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+
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+ if (!this || !rng_algorithm_list_size) {
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+ ret = EFI_INVALID_PARAMETER;
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+ goto back;
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+ }
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+
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+ if (!rng_algorithm_list ||
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+ *rng_algorithm_list_size < sizeof(*rng_algorithm_list)) {
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+ *rng_algorithm_list_size = sizeof(*rng_algorithm_list);
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+ ret = EFI_BUFFER_TOO_SMALL;
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+ goto back;
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+ }
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+
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+ /*
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+ * For now, use EFI_RNG_ALGORITHM_RAW as the default
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+ * algorithm. If a new algorithm gets added in the
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+ * future through a Kconfig, rng_algo_guid will be set
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+ * based on that Kconfig option
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+ */
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+ *rng_algorithm_list_size = sizeof(*rng_algorithm_list);
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+ guidcpy(rng_algorithm_list, &rng_algo_guid);
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+
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+back:
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+ return EFI_EXIT(ret);
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+}
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+
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+static efi_status_t EFIAPI getrng(struct efi_rng_protocol *this,
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+ efi_guid_t *rng_algorithm,
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+ efi_uintn_t rng_value_length,
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+ uint8_t *rng_value)
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+{
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+ int ret;
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+ efi_status_t status = EFI_SUCCESS;
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+ struct udevice *dev;
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+ const efi_guid_t rng_raw_guid = EFI_RNG_ALGORITHM_RAW;
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+
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+ EFI_ENTRY("%p, %p, %zu, %p", this, rng_algorithm, rng_value_length,
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+ rng_value);
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+
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+ if (!this || !rng_value || !rng_value_length) {
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+ status = EFI_INVALID_PARAMETER;
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+ goto back;
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+ }
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+
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+ if (rng_algorithm) {
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+ EFI_PRINT("RNG algorithm %pUl\n", rng_algorithm);
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+ if (guidcmp(rng_algorithm, &rng_raw_guid)) {
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+ status = EFI_UNSUPPORTED;
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+ goto back;
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+ }
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+ }
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+
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+ ret = platform_get_rng_device(&dev);
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+ if (ret != EFI_SUCCESS) {
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+ EFI_PRINT("Rng device not found\n");
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+ status = EFI_UNSUPPORTED;
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+ goto back;
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+ }
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+
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+ ret = dm_rng_read(dev, rng_value, rng_value_length);
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+ if (ret < 0) {
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+ EFI_PRINT("Rng device read failed\n");
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+ status = EFI_DEVICE_ERROR;
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+ goto back;
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+ }
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+
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+back:
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+ return EFI_EXIT(status);
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+}
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+
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+const struct efi_rng_protocol efi_rng_protocol = {
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+ .get_info = rng_getinfo,
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+ .get_rng = getrng,
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+};
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