Loongson's Random Number Generator is found inside Loongson security
engine.
Co-developed-by: Yinggang Gu <guyingg...@loongson.cn>
Signed-off-by: Yinggang Gu <guyingg...@loongson.cn>
Signed-off-by: Qunqin Zhao <zhaoqun...@loongson.cn>
Reviewed-by: Huacai Chen <chenhua...@loongson.cn>
---
v7: Change the lsrng_ prefix to loongson_rng_
v6: Replace all "ls6000se" with "loongson"
v2-v5: None
drivers/crypto/Kconfig | 1 +
drivers/crypto/Makefile | 1 +
drivers/crypto/loongson/Kconfig | 6 +
drivers/crypto/loongson/Makefile | 2 +
drivers/crypto/loongson/loongson-rng.c | 190 +++++++++++++++++++++++++
5 files changed, 200 insertions(+)
create mode 100644 drivers/crypto/loongson/Kconfig
create mode 100644 drivers/crypto/loongson/Makefile
create mode 100644 drivers/crypto/loongson/loongson-rng.c
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 19ab145f9..567ed81b0 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -855,5 +855,6 @@ config CRYPTO_DEV_SA2UL
source "drivers/crypto/aspeed/Kconfig"
source "drivers/crypto/starfive/Kconfig"
+source "drivers/crypto/loongson/Kconfig"
endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index fef18ffdb..643c3710b 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -50,3 +50,4 @@ obj-y += hisilicon/
obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/
obj-y += intel/
obj-y += starfive/
+obj-y += loongson/
diff --git a/drivers/crypto/loongson/Kconfig b/drivers/crypto/loongson/Kconfig
new file mode 100644
index 000000000..4368701ad
--- /dev/null
+++ b/drivers/crypto/loongson/Kconfig
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+config CRYPTO_DEV_LOONGSON_RNG
+ tristate "Support for Loongson RNG Driver"
+ depends on MFD_LOONGSON_SE
+ help
+ Support for Loongson RNG Driver.
diff --git a/drivers/crypto/loongson/Makefile b/drivers/crypto/loongson/Makefile
new file mode 100644
index 000000000..b8b013c86
--- /dev/null
+++ b/drivers/crypto/loongson/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_CRYPTO_DEV_LOONGSON_RNG) += loongson-rng.o
diff --git a/drivers/crypto/loongson/loongson-rng.c
b/drivers/crypto/loongson/loongson-rng.c
new file mode 100644
index 000000000..307014992
--- /dev/null
+++ b/drivers/crypto/loongson/loongson-rng.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 HiSilicon Limited. */
+/* Copyright (c) 2025 Loongson Technology Corporation Limited. */
+
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mfd/loongson-se.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <crypto/internal/rng.h>
+
+struct loongson_rng_list {
+ struct mutex lock;
+ struct list_head list;
+ int is_init;
+};
+
+struct lsrng {
+ bool is_used;
+ struct se_channel *se_ch;
+ struct list_head list;
+ struct completion rng_completion;
+};
+
+struct loongson_rng_ctx {
+ struct lsrng *rng;
+};
+
+struct rng_msg {
+ u32 cmd;
+ union {
+ u32 len;
+ u32 ret;
+ } u;
+ u32 resved;
+ u32 out_off;
+ u32 pad[4];
+};
+
+static atomic_t rng_active_devs;
+static struct loongson_rng_list rng_devices;
+
+static void loongson_rng_complete(struct se_channel *ch)
+{
+ struct lsrng *rng = (struct lsrng *)ch->priv;
+
+ complete(&rng->rng_completion);
+}
+
+static int loongson_rng_generate(struct crypto_rng *tfm, const u8 *src,
+ unsigned int slen, u8 *dstn, unsigned int dlen)
+{
+ struct loongson_rng_ctx *ctx = crypto_rng_ctx(tfm);
+ struct lsrng *rng = ctx->rng;
+ struct rng_msg *msg;
+ int err, len;
+
+ do {
+ len = min(dlen, PAGE_SIZE);
+ msg = rng->se_ch->smsg;
+ msg->u.len = len;
+ err = se_send_ch_requeset(rng->se_ch);
+ if (err)
+ return err;
+
+ wait_for_completion_interruptible(&rng->rng_completion);
+
+ msg = rng->se_ch->rmsg;
+ if (msg->u.ret)
+ return -EFAULT;
+
+ memcpy(dstn, rng->se_ch->data_buffer, len);
+ dlen -= len;
+ dstn += len;
+ } while (dlen > 0);
+
+ return 0;
+}
+
+static int loongson_rng_init(struct crypto_tfm *tfm)
+{
+ struct loongson_rng_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct lsrng *rng;
+ int ret = -EBUSY;
+
+ mutex_lock(&rng_devices.lock);
+ list_for_each_entry(rng, &rng_devices.list, list) {
+ if (!rng->is_used) {
+ rng->is_used = true;
+ ctx->rng = rng;
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&rng_devices.lock);
+
+ return ret;
+}
+
+static void loongson_rng_exit(struct crypto_tfm *tfm)
+{
+ struct loongson_rng_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ mutex_lock(&rng_devices.lock);
+ ctx->rng->is_used = false;
+ mutex_unlock(&rng_devices.lock);
+}
+
+static int no_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
+{
+ return 0;
+}
+
+static struct rng_alg loongson_rng_alg = {
+ .generate = loongson_rng_generate,
+ .seed = no_seed,
+ .base = {
+ .cra_name = "stdrng",
+ .cra_driver_name = "loongson_stdrng",
+ .cra_priority = 300,
+ .cra_ctxsize = sizeof(struct loongson_rng_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = loongson_rng_init,
+ .cra_exit = loongson_rng_exit,
+ },
+};
+
+static void loongson_rng_add_to_list(struct lsrng *rng)
+{
+ mutex_lock(&rng_devices.lock);
+ list_add_tail(&rng->list, &rng_devices.list);
+ mutex_unlock(&rng_devices.lock);
+}
+
+static int loongson_rng_probe(struct platform_device *pdev)
+{
+ struct rng_msg *msg;
+ struct lsrng *rng;
+ int ret;
+
+ rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+ if (!rng)
+ return -ENOMEM;
+
+ init_completion(&rng->rng_completion);
+ rng->se_ch = se_init_ch(pdev->dev.parent, SE_CH_RNG, PAGE_SIZE,
+ sizeof(struct rng_msg) * 2, rng,
loongson_rng_complete);
+ if (!rng->se_ch)
+ return -ENODEV;
+ msg = rng->se_ch->smsg;
+ msg->cmd = SE_CMD_RNG;
+ msg->out_off = rng->se_ch->off;
+
+ if (!rng_devices.is_init) {
+ ret = crypto_register_rng(&loongson_rng_alg);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register crypto(%d)\n",
ret);
+ return ret;
+ }
+ INIT_LIST_HEAD(&rng_devices.list);
+ mutex_init(&rng_devices.lock);
+ rng_devices.is_init = true;
+ }
+
+ loongson_rng_add_to_list(rng);
+ atomic_inc(&rng_active_devs);
+
+ return 0;
+}
+
+static struct platform_driver loongson_rng_driver = {
+ .probe = loongson_rng_probe,
+ .driver = {
+ .name = "loongson-rng",
+ },
+};
+module_platform_driver(loongson_rng_driver);
+
+MODULE_ALIAS("platform:loongson-rng");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yinggang Gu <guyingg...@loongson.cn>");
+MODULE_AUTHOR("Qunqin Zhao <zhaoqun...@loongson.cn>");
+MODULE_DESCRIPTION("Loongson random number generator driver");
--
2.45.2
