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Date: Fri, 20 Nov 2020 17:02:31 +0800
From: Weili Qian <qianweili@...wei.com>
To: <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
<mpm@...enic.com>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
<xuzaibo@...wei.com>, <wangzhou1@...ilicon.com>,
Weili Qian <qianweili@...wei.com>
Subject: [PATCH 1/4] hwrng: hisi - remove HiSilicon TRNG driver
Driver of HiSilicon true random number generator(TRNG)
is removed from 'drivers/char/hw_random'.
Both 'Kunpeng 920' and 'Kunpeng 930' chips have TRNG,
however, PRNG is only supported by 'Kunpeng 930'.
So, this driver is moved to 'drivers/crypto/hisilicon/trng/'
in the next to enable the two's TRNG better.
Signed-off-by: Weili Qian <qianweili@...wei.com>
Reviewed-by: Zaibo Xu <xuzaibo@...wei.com>
---
drivers/char/hw_random/Kconfig | 13 -----
drivers/char/hw_random/Makefile | 1 -
drivers/char/hw_random/hisi-trng-v2.c | 99 -----------------------------------
3 files changed, 113 deletions(-)
delete mode 100644 drivers/char/hw_random/hisi-trng-v2.c
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index e92c4d9..eb0d51a 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -348,19 +348,6 @@ config HW_RANDOM_HISI
If unsure, say Y.
-config HW_RANDOM_HISI_V2
- tristate "HiSilicon True Random Number Generator V2 support"
- depends on HW_RANDOM && ARM64 && ACPI
- default HW_RANDOM
- help
- This driver provides kernel-side support for the True Random Number
- Generator V2 hardware found on HiSilicon Hi1620 SoC.
-
- To compile this driver as a module, choose M here: the
- module will be called hisi-trng-v2.
-
- If unsure, say Y.
-
config HW_RANDOM_ST
tristate "ST Microelectronics HW Random Number Generator support"
depends on HW_RANDOM && ARCH_STI
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 5da3445..8933fad 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
obj-$(CONFIG_HW_RANDOM_HISI) += hisi-rng.o
-obj-$(CONFIG_HW_RANDOM_HISI_V2) += hisi-trng-v2.o
obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o
diff --git a/drivers/char/hw_random/hisi-trng-v2.c b/drivers/char/hw_random/hisi-trng-v2.c
deleted file mode 100644
index 6a65b82..0000000
--- a/drivers/char/hw_random/hisi-trng-v2.c
+++ /dev/null
@@ -1,99 +0,0 @@
-// 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@...wei.com>");
-MODULE_AUTHOR("Zaibo Xu <xuzaibo@...wei.com>");
-MODULE_DESCRIPTION("HiSilicon true random number generator V2 driver");
--
2.8.1
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