crypto: hisilicon/trng - add HiSilicon TRNG driver support

Move existing char/hw_random/hisi-trng-v2.c to crypto/hisilicon/trng.c.

Signed-off-by: Weili Qian <qianweili@huawei.com>
Reviewed-by: Zaibo Xu <xuzaibo@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 17a2df6..646c3b4 100644 (file)
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -1081,6 +1081,7 @@ CONFIG_CRYPTO_DEV_CCREE=m
 CONFIG_CRYPTO_DEV_HISI_SEC2=m
 CONFIG_CRYPTO_DEV_HISI_ZIP=m
 CONFIG_CRYPTO_DEV_HISI_HPRE=m
+CONFIG_CRYPTO_DEV_HISI_TRNG=m
 CONFIG_CMA_SIZE_MBYTES=32
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_INFO=y

diff --git a/drivers/crypto/hisilicon/Kconfig b/drivers/crypto/hisilicon/Kconfig
index 9c3b3ca..2cd3298 100644 (file)
--- a/drivers/crypto/hisilicon/Kconfig
+++ b/drivers/crypto/hisilicon/Kconfig
@@ -71,3 +71,10 @@ config CRYPTO_DEV_HISI_HPRE
        help
          Support for HiSilicon HPRE(High Performance RSA Engine)
          accelerator, which can accelerate RSA and DH algorithms.
+
+config CRYPTO_DEV_HISI_TRNG
+       tristate "Support for HISI TRNG Driver"
+       depends on ARM64 && ACPI
+       select HW_RANDOM
+       help
+         Support for HiSilicon TRNG Driver.

diff --git a/drivers/crypto/hisilicon/Makefile b/drivers/crypto/hisilicon/Makefile
index 7f5f74c..1e89269 100644 (file)
--- a/drivers/crypto/hisilicon/Makefile
+++ b/drivers/crypto/hisilicon/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_CRYPTO_DEV_HISI_SEC2) += sec2/
 obj-$(CONFIG_CRYPTO_DEV_HISI_QM) += hisi_qm.o
 hisi_qm-objs = qm.o sgl.o
 obj-$(CONFIG_CRYPTO_DEV_HISI_ZIP) += zip/
+obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += trng/

diff --git a/drivers/crypto/hisilicon/trng/Makefile b/drivers/crypto/hisilicon/trng/Makefile
new file mode 100644 (file)
index 0000000..d909079
--- /dev/null
+++ b/drivers/crypto/hisilicon/trng/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_CRYPTO_DEV_HISI_TRNG) += hisi-trng-v2.o
+hisi-trng-v2-objs = trng.o

diff --git a/drivers/crypto/hisilicon/trng/trng.c b/drivers/crypto/hisilicon/trng/trng.c
new file mode 100644 (file)
index 0000000..6a65b82
--- /dev/null
+++ b/drivers/crypto/hisilicon/trng/trng.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 HiSilicon Limited. */
+
+#include <linux/acpi.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+
+#define HISI_TRNG_REG          0x00F0
+#define HISI_TRNG_BYTES                4
+#define HISI_TRNG_QUALITY      512
+#define SLEEP_US               10
+#define TIMEOUT_US             10000
+
+struct hisi_trng {
+       void __iomem *base;
+       struct hwrng rng;
+};
+
+static int hisi_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+       struct hisi_trng *trng;
+       int currsize = 0;
+       u32 val = 0;
+       u32 ret;
+
+       trng = container_of(rng, struct hisi_trng, rng);
+
+       do {
+               ret = readl_poll_timeout(trng->base + HISI_TRNG_REG, val,
+                                        val, SLEEP_US, TIMEOUT_US);
+               if (ret)
+                       return currsize;
+
+               if (max - currsize >= HISI_TRNG_BYTES) {
+                       memcpy(buf + currsize, &val, HISI_TRNG_BYTES);
+                       currsize += HISI_TRNG_BYTES;
+                       if (currsize == max)
+                               return currsize;
+                       continue;
+               }
+
+               /* copy remaining bytes */
+               memcpy(buf + currsize, &val, max - currsize);
+               currsize = max;
+       } while (currsize < max);
+
+       return currsize;
+}
+
+static int hisi_trng_probe(struct platform_device *pdev)
+{
+       struct hisi_trng *trng;
+       int ret;
+
+       trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+       if (!trng)
+               return -ENOMEM;
+
+       trng->base = devm_platform_ioremap_resource(pdev, 0);
+       if (IS_ERR(trng->base))
+               return PTR_ERR(trng->base);
+
+       trng->rng.name = pdev->name;
+       trng->rng.read = hisi_trng_read;
+       trng->rng.quality = HISI_TRNG_QUALITY;
+
+       ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+       if (ret)
+               dev_err(&pdev->dev, "failed to register hwrng!\n");
+
+       return ret;
+}
+
+static const struct acpi_device_id hisi_trng_acpi_match[] = {
+       { "HISI02B3", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(acpi, hisi_trng_acpi_match);
+
+static struct platform_driver hisi_trng_driver = {
+       .probe          = hisi_trng_probe,
+       .driver         = {
+               .name   = "hisi-trng-v2",
+               .acpi_match_table = ACPI_PTR(hisi_trng_acpi_match),
+       },
+};
+
+module_platform_driver(hisi_trng_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Weili Qian <qianweili@huawei.com>");
+MODULE_AUTHOR("Zaibo Xu <xuzaibo@huawei.com>");
+MODULE_DESCRIPTION("HiSilicon true random number generator V2 driver");