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Message-ID: <0c7ae690-31f5-5d10-3168-2a54d4974399@linaro.org>
Date: Wed, 17 Aug 2016 17:01:15 +0100
From: Daniel Thompson <daniel.thompson@...aro.org>
To: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
mpm@...enic.com, herbert@...dor.apana.org.au, robh+dt@...nel.org,
mark.rutland@....com, ralf@...ux-mips.org, davem@...emloft.net,
geert@...ux-m68k.org, akpm@...ux-foundation.org,
gregkh@...uxfoundation.org, mchehab@...nel.org, linux@...ck-us.net,
boris.brezillon@...e-electrons.com, harvey.hunt@...tec.com,
alex.smith@...tec.com, lee.jones@...aro.org, f.fainelli@...il.com,
kieran@...uared.org.uk, krzk@...nel.org,
joshua.henderson@...rochip.com, yendapally.reddy@...adcom.com,
narmstrong@...libre.com, wangkefeng.wang@...wei.com,
chunkeey@...glemail.com, noltari@...il.com,
linus.walleij@...aro.org, pankaj.dev@...com,
mathieu.poirier@...aro.org, linux-crypto@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mips@...ux-mips.org
Subject: Re: [PATCH] Add Ingenic JZ4780 hardware RNG driver
On 17/08/16 16:35, PrasannaKumar Muralidharan wrote:
> This patch adds support for hardware random number generator present in
> JZ4780 SoC.
>
> Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> ---
> .../devicetree/bindings/rng/ingenic,jz4780-rng.txt | 12 +++
> MAINTAINERS | 5 +
> arch/mips/boot/dts/ingenic/jz4780.dtsi | 7 +-
> drivers/char/hw_random/Kconfig | 14 +++
> drivers/char/hw_random/Makefile | 1 +
> drivers/char/hw_random/jz4780-rng.c | 105 +++++++++++++++++++++
> 6 files changed, 143 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/rng/ingenic,jz4780-rng.txt
> create mode 100644 drivers/char/hw_random/jz4780-rng.c
>
> diff --git a/Documentation/devicetree/bindings/rng/ingenic,jz4780-rng.txt b/Documentation/devicetree/bindings/rng/ingenic,jz4780-rng.txt
> new file mode 100644
> index 0000000..03abf56
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rng/ingenic,jz4780-rng.txt
> @@ -0,0 +1,12 @@
> +Ingenic jz4780 RNG driver
> +
> +Required properties:
> +- compatible : Should be "ingenic,jz4780-rng"
> +- reg : Specifies base physical address and size of the registers.
> +
> +Example:
> +
> +rng: rng@...000D8 {
> + compatible = "ingenic,jz4780-rng";
> + reg = <0x100000D8 0x8>;
> +};
Device tree bindings should be a separate patch. See
Documentation/devicetree/bindings/submitting-patches.txt .
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 08e9efe..c0c66eb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6002,6 +6002,11 @@ M: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
> S: Maintained
> F: drivers/dma/dma-jz4780.c
>
> +INGENIC JZ4780 HW RNG Driver
> +M: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> +S: Maintained
> +F: drivers/char/hw_random/jz4780-rng.c
> +
> INTEGRITY MEASUREMENT ARCHITECTURE (IMA)
> M: Mimi Zohar <zohar@...ux.vnet.ibm.com>
> M: Dmitry Kasatkin <dmitry.kasatkin@...il.com>
> diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
> index b868b42..f11d139 100644
> --- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
> +++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
> @@ -36,7 +36,7 @@
>
> cgu: jz4780-cgu@...00000 {
> compatible = "ingenic,jz4780-cgu";
> - reg = <0x10000000 0x100>;
> + reg = <0x10000000 0xD8>;
> clocks = <&ext>, <&rtc>;
> clock-names = "ext", "rtc";
> @@ -44,6 +44,11 @@
> #clock-cells = <1>;
> };
>
> + rng: jz4780-rng@...000D8 {
> + compatible = "ingenic,jz4780-rng";
> + reg = <0x100000D8 0x8>;
> + };
> +
> uart0: serial@...30000 {
> compatible = "ingenic,jz4780-uart";
> reg = <0x10030000 0x100>;
Updates to device tree files are also normally sent as a separate patch
later in the series than the driver itself (at least they are in arm land).
> diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
> index 56ad5a59..c336fe8 100644
> --- a/drivers/char/hw_random/Kconfig
> +++ b/drivers/char/hw_random/Kconfig
> @@ -294,6 +294,20 @@ config HW_RANDOM_POWERNV
>
> If unsure, say Y.
>
> +config HW_RANDOM_JZ4780
> + tristate "JZ4780 HW random number generator support"
> + depends on MACH_INGENIC
> + depends on HAS_IOMEM
> + default HW_RANDOM
> + ---help---
> + This driver provides kernel-side support for the Random Number
> + Generator hardware found on JZ4780 SOCs.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called jz4780-rng.
> +
> + If unsure, say Y.
> +
Shouldn't this be inserted either in alphabetic order (which not
applicable for this file) or at the end of the file?
> config HW_RANDOM_EXYNOS
> tristate "EXYNOS HW random number generator support"
> depends on ARCH_EXYNOS || COMPILE_TEST
> diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
> index 04bb0b0..a155066 100644
> --- a/drivers/char/hw_random/Makefile
> +++ b/drivers/char/hw_random/Makefile
> @@ -26,6 +26,7 @@ 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-$(CONFIG_HW_RANDOM_JZ4780) += jz4780-rng.o
This looks like it inserts into the makefile in a gratuitously different
order than the one in the KConfig file.
> obj-$(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/jz4780-rng.c b/drivers/char/hw_random/jz4780-rng.c
> new file mode 100644
> index 0000000..c9d2cde
> --- /dev/null
> +++ b/drivers/char/hw_random/jz4780-rng.c
> @@ -0,0 +1,105 @@
> +/*
> + * jz4780-rng.c - Random Number Generator driver for J4780
> + *
> + * Copyright 2016 (C) PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/hw_random.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/err.h>
> +
> +#define REG_RNG_CTRL 0x0
> +#define REG_RNG_DATA 0x4
> +
> +struct jz4780_rng {
> + struct device *dev;
> + struct hwrng rng;
> + void __iomem *mem;
> +};
> +
> +static u32 jz4780_rng_readl(struct jz4780_rng *rng, u32 offset)
> +{
> + return readl(rng->mem + offset);
> +}
> +
> +static void jz4780_rng_writel(struct jz4780_rng *rng, u32 val, u32 offset)
> +{
> + writel(val, rng->mem + offset);
> +}
> +
> +static int jz4780_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
> +{
> + struct jz4780_rng *jz4780_rng = container_of(rng, struct jz4780_rng,
> + rng);
> + u32 *data = buf;
> + *data = jz4780_rng_readl(jz4780_rng, REG_RNG_DATA);
> + return 4;
> +}
> +
> +static int jz4780_rng_probe(struct platform_device *pdev)
> +{
> + struct jz4780_rng *jz4780_rng;
> + struct resource *res;
> + resource_size_t size;
> + int ret;
> +
> + jz4780_rng = devm_kzalloc(&pdev->dev, sizeof(struct jz4780_rng),
> + GFP_KERNEL);
> + if (!jz4780_rng)
> + return -ENOMEM;
> +
> + jz4780_rng->dev = &pdev->dev;
> + jz4780_rng->rng.name = "jz4780";
> + jz4780_rng->rng.read = jz4780_rng_read;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
If platform_get_resource() returns NULL I think this code will crash.
> + size = resource_size(res);
> +
> + jz4780_rng->mem = devm_ioremap(&pdev->dev, res->start, size);
> + if (IS_ERR(jz4780_rng->mem))
> + return PTR_ERR(jz4780_rng->mem);
> +
> + platform_set_drvdata(pdev, jz4780_rng);
> + jz4780_rng_writel(jz4780_rng, 1, REG_RNG_CTRL);
> + ret = hwrng_register(&jz4780_rng->rng);
> + return ret;
> +}
> +
> +static int jz4780_rng_remove(struct platform_device *pdev)
> +{
> + struct jz4780_rng *jz4780_rng = platform_get_drvdata(pdev);
> +
> + jz4780_rng_writel(jz4780_rng, 0, REG_RNG_CTRL);
> + hwrng_unregister(&jz4780_rng->rng);
These two are in same order as probe() function. I would expect them to
be reversed (so hardware cannot be shutdown until we have unregistered it).
> +
> + return 0;
> +}
> +
> +static const struct of_device_id jz4780_rng_dt_match[] = {
> + { .compatible = "ingenic,jz4780-rng", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, jz4780_rng_dt_match);
> +
> +static struct platform_driver jz4780_rng_driver = {
> + .driver = {
> + .name = "jz4780-rng",
> + .of_match_table = jz4780_rng_dt_match,
> + },
> + .probe = jz4780_rng_probe,
> + .remove = jz4780_rng_remove,
> +};
> +module_platform_driver(jz4780_rng_driver);
> +
> +MODULE_DESCRIPTION("Ingenic JZ4780 H/W Random Number Generator driver");
> +MODULE_AUTHOR("PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>");
> +MODULE_LICENSE("GPL");
>
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