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// 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>
#define SE_SEED_SIZE 32
struct loongson_rng_list {
struct mutex lock;
struct list_head list;
int registered;
};
struct loongson_rng {
u32 used;
struct loongson_se_engine *engine;
struct list_head list;
struct mutex lock;
};
struct loongson_rng_ctx {
struct loongson_rng *rng;
};
struct loongson_rng_cmd {
u32 cmd_id;
union {
u32 len;
u32 ret;
} u;
u32 seed_off;
u32 out_off;
u32 pad[4];
};
static struct loongson_rng_list rng_devices = {
.lock = __MUTEX_INITIALIZER(rng_devices.lock),
.list = LIST_HEAD_INIT(rng_devices.list),
};
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 loongson_rng *rng = ctx->rng;
struct loongson_rng_cmd *cmd = rng->engine->command;
int err, len;
mutex_lock(&rng->lock);
cmd->seed_off = 0;
do {
len = min(dlen, rng->engine->buffer_size);
cmd = rng->engine->command;
cmd->u.len = len;
err = loongson_se_send_engine_cmd(rng->engine);
if (err)
break;
cmd = rng->engine->command_ret;
if (cmd->u.ret) {
err = -EIO;
break;
}
memcpy(dstn, rng->engine->data_buffer, len);
dlen -= len;
dstn += len;
} while (dlen > 0);
mutex_unlock(&rng->lock);
return err;
}
static int loongson_rng_init(struct crypto_tfm *tfm)
{
struct loongson_rng_ctx *ctx = crypto_tfm_ctx(tfm);
struct loongson_rng *rng;
u32 min_used = U32_MAX;
mutex_lock(&rng_devices.lock);
list_for_each_entry(rng, &rng_devices.list, list) {
if (rng->used < min_used) {
ctx->rng = rng;
min_used = rng->used;
}
}
ctx->rng->used++;
mutex_unlock(&rng_devices.lock);
return 0;
}
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->used--;
mutex_unlock(&rng_devices.lock);
}
static int loongson_rng_seed(struct crypto_rng *tfm, const u8 *seed,
unsigned int slen)
{
struct loongson_rng_ctx *ctx = crypto_rng_ctx(tfm);
struct loongson_rng *rng = ctx->rng;
struct loongson_rng_cmd *cmd;
int err;
if (slen < SE_SEED_SIZE)
return -EINVAL;
slen = min(slen, rng->engine->buffer_size);
mutex_lock(&rng->lock);
cmd = rng->engine->command;
cmd->u.len = slen;
cmd->seed_off = rng->engine->buffer_off;
memcpy(rng->engine->data_buffer, seed, slen);
err = loongson_se_send_engine_cmd(rng->engine);
if (err)
goto out;
cmd = rng->engine->command_ret;
if (cmd->u.ret)
err = -EIO;
out:
mutex_unlock(&rng->lock);
return err;
}
static struct rng_alg loongson_rng_alg = {
.generate = loongson_rng_generate,
.seed = loongson_rng_seed,
.seedsize = SE_SEED_SIZE,
.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 int loongson_rng_probe(struct platform_device *pdev)
{
struct loongson_rng_cmd *cmd;
struct loongson_rng *rng;
int ret = 0;
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
if (!rng)
return -ENOMEM;
rng->engine = loongson_se_init_engine(pdev->dev.parent, SE_ENGINE_RNG);
if (!rng->engine)
return -ENODEV;
cmd = rng->engine->command;
cmd->cmd_id = SE_CMD_RNG;
cmd->out_off = rng->engine->buffer_off;
mutex_init(&rng->lock);
mutex_lock(&rng_devices.lock);
if (!rng_devices.registered) {
ret = crypto_register_rng(&loongson_rng_alg);
if (ret) {
dev_err(&pdev->dev, "failed to register crypto(%d)\n", ret);
goto out;
}
rng_devices.registered = 1;
}
list_add_tail(&rng->list, &rng_devices.list);
out:
mutex_unlock(&rng_devices.lock);
return ret;
}
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 <guyinggang@loongson.cn>");
MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>");
MODULE_DESCRIPTION("Loongson Random Number Generator driver");
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