[PATCH 1/2] dt/bindings: Add bindings for hisilicon random number generator

[PATCH 1/2] dt/bindings: Add bindings for hisilicon random number generator

[Kefeng Wang]

Document the devicetree bindings for the random number generator
found on Hisilicon Hip04 and Hip05 soc.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 Documentation/devicetree/bindings/rng/hisi-rng.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/hisi-rng.txt

diff --git a/Documentation/devicetree/bindings/rng/hisi-rng.txt b/Documentation/devicetree/bindings/rng/hisi-rng.txt
new file mode 100644
index 0000000..80f29b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/hisi-rng.txt
@@ -0,0 +1,12 @@
+Hisilicon Random Number Generator
+
+Required properties:
+- compatible : Should be "hisilicon,hisi-rng"
+- reg : Offset and length of the register set of this block
+
+Example:
+
+rng@d1010000 {
+	compatible = "hisilicon,hisi-rng";
+	reg = <0xd1010000 0x100>;
+};
-- 
1.7.12.4

[PATCH 2/2] hwrng: hisi: Add support for Hisilicon RNG support

[Kefeng Wang]

This adds the Hisilicon Random Number Generator(RNG) support,
which is found on Hip04 and Hip05 soc.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 drivers/char/hw_random/Kconfig    |  13 ++++
 drivers/char/hw_random/Makefile   |   1 +
 drivers/char/hw_random/hisi-rng.c | 121 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 135 insertions(+)
 create mode 100644 drivers/char/hw_random/hisi-rng.c

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 67ee8b0..088b1bf 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -333,6 +333,19 @@ config HW_RANDOM_TPM
 
 	  If unsure, say Y.
 
+config HW_RANDOM_HISI
+	tristate "Hisilicon Random Number Generator support"
+	depends on HW_RANDOM && ARCH_HISI
+	default HW_RANDOM
+	---help---
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Hisilicon Hip04 and Hip05 SoC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hisi-rng.
+
+	  If unsure, say Y.
+
 config HW_RANDOM_MSM
 	tristate "Qualcomm SoCs Random Number Generator support"
 	depends on HW_RANDOM && ARCH_QCOM
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index f5a6fa7..e09305b 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
 obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
 obj-$(CONFIG_HW_RANDOM_EXYNOS)	+= exynos-rng.o
+obj-$(CONFIG_HW_RANDOM_HISI)	+= hisi-rng.o
 obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o
 obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
 obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
diff --git a/drivers/char/hw_random/hisi-rng.c b/drivers/char/hw_random/hisi-rng.c
new file mode 100644
index 0000000..59580e4
--- /dev/null
+++ b/drivers/char/hw_random/hisi-rng.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2016 HiSilicon Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+
+#define RNG_SEED	0x0
+#define RNG_CTRL	0x4
+  #define RNG_SEED_SEL	BIT(2)
+  #define RNG_RING_EN	BIT(1)
+  #define RNG_EN	BIT(0)
+#define RNG_RAN_NUM	0x10
+#define RNG_PHY_SEED	0x14
+
+#define to_hisi_rng(p)	container_of(p, struct hisi_rng, rng)
+
+static int seed_sel;
+module_param(seed_sel, int, S_IRUGO);
+MODULE_PARM_DESC(seed_sel, "Auto reload seed. 0, use LFSR(default); 1, use ring oscillator.");
+
+struct hisi_rng {
+	void __iomem *base;
+	struct hwrng rng;
+};
+
+static int hisi_rng_init(struct hwrng *rng)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+	int val = RNG_EN;
+	u32 seed;
+
+	/* get a random number as initial seed */
+	get_random_bytes(&seed, sizeof(seed));
+
+	writel_relaxed(seed, hrng->base + RNG_SEED);
+
+	if (seed_sel == 1)
+		val |= RNG_RING_EN | RNG_SEED_SEL;
+
+	writel_relaxed(val, hrng->base + RNG_CTRL);
+	return 0;
+}
+
+static void hisi_rng_cleanup(struct hwrng *rng)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+
+	writel_relaxed(0, hrng->base + RNG_CTRL);
+}
+
+static int hisi_rng_read(struct hwrng *rng, void *buf, size_t max,
+			 bool wait)
+{
+	struct hisi_rng *hrng = to_hisi_rng(rng);
+	u32 *data = buf;
+
+	*data = readl_relaxed(hrng->base + RNG_RAN_NUM);
+	return 4;
+}
+
+static int hisi_rng_probe(struct platform_device *pdev)
+{
+	struct hisi_rng *rng;
+	struct resource *res;
+	int ret;
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, rng);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rng->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(rng->base))
+		return PTR_ERR(rng->base);
+
+	rng->rng.name = pdev->name;
+	rng->rng.init = hisi_rng_init;
+	rng->rng.cleanup = hisi_rng_cleanup;
+	rng->rng.read = hisi_rng_read;
+
+	ret = devm_hwrng_register(&pdev->dev, &rng->rng);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register hwrng\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id hisi_rng_dt_ids[] = {
+	{ .compatible = "hisilicon,hisi-rng" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hisi_rng_dt_ids);
+
+static struct platform_driver hisi_rng_driver = {
+	.probe		= hisi_rng_probe,
+	.driver		= {
+		.name	= "hisi-rng",
+		.of_match_table = of_match_ptr(hisi_rng_dt_ids),
+	},
+};
+
+module_platform_driver(hisi_rng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kefeng Wang <wangkefeng.wang@huawei>");
+MODULE_DESCRIPTION("Hisilicon random number generator driver");
-- 
1.7.12.4

Re: [PATCH 1/2] dt/bindings: Add bindings for hisilicon random number generator

[Rob Herring]

On Fri, Apr 01, 2016 at 09:37:43AM +0800, Kefeng Wang wrote:
> Document the devicetree bindings for the random number generator
> found on Hisilicon Hip04 and Hip05 soc.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>  Documentation/devicetree/bindings/rng/hisi-rng.txt | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rng/hisi-rng.txt
> 
> diff --git a/Documentation/devicetree/bindings/rng/hisi-rng.txt b/Documentation/devicetree/bindings/rng/hisi-rng.txt
> new file mode 100644
> index 0000000..80f29b6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rng/hisi-rng.txt
> @@ -0,0 +1,12 @@
> +Hisilicon Random Number Generator
> +
> +Required properties:
> +- compatible : Should be "hisilicon,hisi-rng"

hisi is a bit redundant with hisilicon and please define SoC specific 
compatible strings.

> +- reg : Offset and length of the register set of this block
> +
> +Example:
> +
> +rng@d1010000 {
> +	compatible = "hisilicon,hisi-rng";
> +	reg = <0xd1010000 0x100>;
> +};
> -- 
> 1.7.12.4
> 
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Re: [PATCH 1/2] dt/bindings: Add bindings for hisilicon random number generator

[Kefeng Wang]

On 2016/4/4 13:15, Rob Herring wrote:
> On Fri, Apr 01, 2016 at 09:37:43AM +0800, Kefeng Wang wrote:
>> Document the devicetree bindings for the random number generator
>> found on Hisilicon Hip04 and Hip05 soc.
[...]
>> +
>> +Required properties:
>> +- compatible : Should be "hisilicon,hisi-rng"
> 
> hisi is a bit redundant with hisilicon and please define SoC specific 
> compatible strings.

Due to it exists in both Hip04/Hip05 soc(and maybe some other chips),
how about drop hisi-, just "hisilicon,rng".

Thanks

> 
>> +- reg : Offset and length of the register set of this block
>> +
>> +Example:
>> +
>> +rng@d1010000 {
>> +	compatible = "hisilicon,hisi-rng";
>> +	reg = <0xd1010000 0x100>;
>> +};
>> -- 
>> 1.7.12.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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> 
> .
> 

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