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Message-Id: <20250114095527.23722-3-zhaoqunqin@loongson.cn>
Date: Tue, 14 Jan 2025 17:55:26 +0800
From: Qunqin Zhao <zhaoqunqin@...ngson.cn>
To: lee@...nel.org,
herbert@...dor.apana.org.au,
gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
loongarch@...ts.linux.dev,
davem@...emloft.net,
linux-crypto@...r.kernel.org,
arnd@...db.de,
derek.kiernan@....com,
dragan.cvetic@....com,
Qunqin Zhao <zhaoqunqin@...ngson.cn>,
Yinggang Gu <guyinggang@...ngson.cn>
Subject: [PATCH v1 2/3] crypto: loongson - add Loongson RNG driver support
Loongson's Random Number Generator is found inside Loongson 6000SE.
Co-developed-by: Yinggang Gu <guyinggang@...ngson.cn>
Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
Signed-off-by: Qunqin Zhao <zhaoqunqin@...ngson.cn>
---
MAINTAINERS | 6 +
drivers/crypto/Kconfig | 1 +
drivers/crypto/Makefile | 1 +
drivers/crypto/loongson/Kconfig | 6 +
drivers/crypto/loongson/Makefile | 2 +
drivers/crypto/loongson/ls6000se-rng.c | 190 +++++++++++++++++++++++++
6 files changed, 206 insertions(+)
create mode 100644 drivers/crypto/loongson/Kconfig
create mode 100644 drivers/crypto/loongson/Makefile
create mode 100644 drivers/crypto/loongson/ls6000se-rng.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3c8a9d6198..e65a7f4ea4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13480,6 +13480,12 @@ S: Maintained
F: Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
F: drivers/gpio/gpio-loongson-64bit.c
+LOONGSON CRYPTO DRIVER
+M: Qunqin Zhao <zhaoqunqin@...ngson.com>
+L: linux-crypto@...r.kernel.org
+S: Maintained
+F: drivers/crypto/loongson/
+
LOONGSON-2 APB DMA DRIVER
M: Binbin Zhou <zhoubinbin@...ngson.cn>
L: dmaengine@...r.kernel.org
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 0a9cdd31cb..80caf6158e 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -872,5 +872,6 @@ 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 ad4ccef67d..a80e2586f7 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -52,3 +52,4 @@ obj-y += hisilicon/
obj-$(CONFIG_CRYPTO_DEV_AMLOGIC_GXL) += amlogic/
obj-y += intel/
obj-y += starfive/
+obj-y += loongson/
diff --git a/drivers/crypto/loongson/Kconfig b/drivers/crypto/loongson/Kconfig
new file mode 100644
index 0000000000..2b0b8b3241
--- /dev/null
+++ b/drivers/crypto/loongson/Kconfig
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+config CRYPTO_DEV_LS6000SE_RNG
+ tristate "Support for Loongson 6000SE RNG Driver"
+ depends on MFD_LS6000SE
+ help
+ Support for Loongson 6000SE RNG Driver.
diff --git a/drivers/crypto/loongson/Makefile b/drivers/crypto/loongson/Makefile
new file mode 100644
index 0000000000..17b0fa89e9
--- /dev/null
+++ b/drivers/crypto/loongson/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_CRYPTO_DEV_LS6000SE_RNG) += ls6000se-rng.o
diff --git a/drivers/crypto/loongson/ls6000se-rng.c b/drivers/crypto/loongson/ls6000se-rng.c
new file mode 100644
index 0000000000..b366475782
--- /dev/null
+++ b/drivers/crypto/loongson/ls6000se-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/ls6000se.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <crypto/internal/rng.h>
+
+struct lsrng_list {
+ struct mutex lock;
+ struct list_head list;
+ int is_init;
+};
+
+struct lsrng {
+ bool is_used;
+ struct lsse_ch *se_ch;
+ struct list_head list;
+ struct completion rng_completion;
+};
+
+struct lsrng_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 lsrng_list rng_devices;
+
+static void lsrng_complete(struct lsse_ch *ch)
+{
+ struct lsrng *rng = (struct lsrng *)ch->priv;
+
+ complete(&rng->rng_completion);
+}
+
+static int lsrng_generate(struct crypto_rng *tfm, const u8 *src,
+ unsigned int slen, u8 *dstn, unsigned int dlen)
+{
+ struct lsrng_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 lsrng_init(struct crypto_tfm *tfm)
+{
+ struct lsrng_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 lsrng_exit(struct crypto_tfm *tfm)
+{
+ struct lsrng_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 lsrng_alg = {
+ .generate = lsrng_generate,
+ .seed = no_seed,
+ .base = {
+ .cra_name = "stdrng",
+ .cra_driver_name = "loongson_stdrng",
+ .cra_priority = 300,
+ .cra_ctxsize = sizeof(struct lsrng_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = lsrng_init,
+ .cra_exit = lsrng_exit,
+ },
+};
+
+static void lsrng_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 lsrng_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, lsrng_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(&lsrng_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;
+ }
+
+ lsrng_add_to_list(rng);
+ atomic_inc(&rng_active_devs);
+
+ return 0;
+}
+
+static struct platform_driver lsrng_driver = {
+ .probe = lsrng_probe,
+ .driver = {
+ .name = "ls6000se-rng",
+ },
+};
+module_platform_driver(lsrng_driver);
+
+MODULE_ALIAS("platform:ls6000se-rng");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yinggang Gu <guyinggang@...ngson.cn>");
+MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@...ngson.cn>");
+MODULE_DESCRIPTION("Loongson random number generator driver");
--
2.43.0
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