| Message ID | 1460343718-2722-3-git-send-email-wangkefeng.wang@huawei.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Herbert Xu |
| Headers | show |
On 10 April 2016 at 21:01, Kefeng Wang <wangkefeng.wang@huawei.com> wrote: > This adds the Hisilicon Random Number Generator(RNG) support, > which is found in 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 | 125 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 139 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..6bdf28c > --- /dev/null > +++ b/drivers/char/hw_random/hisi-rng.c > @@ -0,0 +1,125 @@ > +/* > + * 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); > + > + /** > + * The seed is reload periodically, there are two choice > + * of seeds, default seed using the value from LFSR, or > + * will use seed generated by ring oscillator. > + */ > + 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,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"); Thanks for the modifications, Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > -- > 1.7.12.4 > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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..6bdf28c --- /dev/null +++ b/drivers/char/hw_random/hisi-rng.c @@ -0,0 +1,125 @@ +/* + * 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); + + /** + * The seed is reload periodically, there are two choice + * of seeds, default seed using the value from LFSR, or + * will use seed generated by ring oscillator. + */ + 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,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");
This adds the Hisilicon Random Number Generator(RNG) support, which is found in 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 | 125 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 139 insertions(+) create mode 100644 drivers/char/hw_random/hisi-rng.c