From b329669ea0b5b02efd41f94372bcf0e988814af4 Mon Sep 17 00:00:00 2001 From: Jonghwa Lee Date: Fri, 29 Jun 2012 09:43:26 +0900 Subject: hwrng: exynos - Add support for Exynos random number generator This patch supports Exynos SOC's PRNG driver. Exynos's PRNG has 5 seeds and 5 random number outputs. Module is excuted under runtime power management control, so it activates only while it's in use. Otherwise it will be suspended generally. It was tested on PQ board by rngtest program. Signed-off-by: Jonghwa Lee Signed-off-by: Kyungmin Park Reviewed-by: Stephen Boyd Signed-off-by: Herbert Xu --- drivers/char/hw_random/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/char/hw_random/Makefile') diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index d901dfa30321..8d6d173b65e6 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -23,3 +23,4 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o +obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o -- cgit v1.2.3 From 553072b27e0990ab1d73d43efb4ab518f953fcc3 Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 24 Jul 2012 16:33:11 +0200 Subject: hw_random: add Broadcom BCM63xx RNG driver Signed-off-by: Florian Fainelli Cc: linux-mips@linux-mips.org Cc: mpm@selenic.com Cc: herbert@gondor.apana.org.au Patchwork: https://patchwork.linux-mips.org/patch/3327/ Patchwork: https://patchwork.linux-mips.org/patch/4072/ Signed-off-by: Ralf Baechle --- drivers/char/hw_random/Kconfig | 14 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/bcm63xx-rng.c | 175 +++++++++++++++++++++++++++++++++++ 3 files changed, 190 insertions(+) create mode 100644 drivers/char/hw_random/bcm63xx-rng.c (limited to 'drivers/char/hw_random/Makefile') diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index f45dad39a18b..6640311ff1c9 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -73,6 +73,20 @@ config HW_RANDOM_ATMEL If unsure, say Y. +config HW_RANDOM_BCM63XX + tristate "Broadcom BCM63xx Random Number Generator support" + depends on HW_RANDOM && BCM63XX + default HW_RANDOM + ---help--- + This driver provides kernel-side support for the Random Number + Generator hardware found on the Broadcom BCM63xx SoCs. + + To compile this driver as a module, choose M here: the + module will be called bcm63xx-rng + + If unusure, say Y. + + config HW_RANDOM_GEODE tristate "AMD Geode HW Random Number Generator support" depends on HW_RANDOM && X86_32 && PCI diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index d901dfa30321..67f57bf239e4 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += timeriomem-rng.o obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o +obj-$(CONFIG_HW_RANDOM_BCM63XX) += bcm63xx-rng.o obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o n2-rng-y := n2-drv.o n2-asm.o diff --git a/drivers/char/hw_random/bcm63xx-rng.c b/drivers/char/hw_random/bcm63xx-rng.c new file mode 100644 index 000000000000..aec6a4277caa --- /dev/null +++ b/drivers/char/hw_random/bcm63xx-rng.c @@ -0,0 +1,175 @@ +/* + * Broadcom BCM63xx Random Number Generator support + * + * Copyright (C) 2011, Florian Fainelli + * Copyright (C) 2009, Broadcom Corporation + * + */ +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +struct bcm63xx_rng_priv { + struct clk *clk; + void __iomem *regs; +}; + +#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv) + +static int bcm63xx_rng_init(struct hwrng *rng) +{ + struct bcm63xx_rng_priv *priv = to_rng_priv(rng); + u32 val; + + val = bcm_readl(priv->regs + RNG_CTRL); + val |= RNG_EN; + bcm_writel(val, priv->regs + RNG_CTRL); + + return 0; +} + +static void bcm63xx_rng_cleanup(struct hwrng *rng) +{ + struct bcm63xx_rng_priv *priv = to_rng_priv(rng); + u32 val; + + val = bcm_readl(priv->regs + RNG_CTRL); + val &= ~RNG_EN; + bcm_writel(val, priv->regs + RNG_CTRL); +} + +static int bcm63xx_rng_data_present(struct hwrng *rng, int wait) +{ + struct bcm63xx_rng_priv *priv = to_rng_priv(rng); + + return bcm_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK; +} + +static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data) +{ + struct bcm63xx_rng_priv *priv = to_rng_priv(rng); + + *data = bcm_readl(priv->regs + RNG_DATA); + + return 4; +} + +static int __devinit bcm63xx_rng_probe(struct platform_device *pdev) +{ + struct resource *r; + struct clk *clk; + int ret; + struct bcm63xx_rng_priv *priv; + struct hwrng *rng; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + dev_err(&pdev->dev, "no iomem resource\n"); + ret = -ENXIO; + goto out; + } + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + dev_err(&pdev->dev, "no memory for private structure\n"); + ret = -ENOMEM; + goto out; + } + + rng = kzalloc(sizeof(*rng), GFP_KERNEL); + if (!rng) { + dev_err(&pdev->dev, "no memory for rng structure\n"); + ret = -ENOMEM; + goto out_free_priv; + } + + platform_set_drvdata(pdev, rng); + rng->priv = (unsigned long)priv; + rng->name = pdev->name; + rng->init = bcm63xx_rng_init; + rng->cleanup = bcm63xx_rng_cleanup; + rng->data_present = bcm63xx_rng_data_present; + rng->data_read = bcm63xx_rng_data_read; + + clk = clk_get(&pdev->dev, "ipsec"); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "no clock for device\n"); + ret = PTR_ERR(clk); + goto out_free_rng; + } + + priv->clk = clk; + + if (!devm_request_mem_region(&pdev->dev, r->start, + resource_size(r), pdev->name)) { + dev_err(&pdev->dev, "request mem failed"); + ret = -ENOMEM; + goto out_free_rng; + } + + priv->regs = devm_ioremap_nocache(&pdev->dev, r->start, + resource_size(r)); + if (!priv->regs) { + dev_err(&pdev->dev, "ioremap failed"); + ret = -ENOMEM; + goto out_free_rng; + } + + clk_enable(clk); + + ret = hwrng_register(rng); + if (ret) { + dev_err(&pdev->dev, "failed to register rng device\n"); + goto out_clk_disable; + } + + dev_info(&pdev->dev, "registered RNG driver\n"); + + return 0; + +out_clk_disable: + clk_disable(clk); +out_free_rng: + platform_set_drvdata(pdev, NULL); + kfree(rng); +out_free_priv: + kfree(priv); +out: + return ret; +} + +static int __devexit bcm63xx_rng_remove(struct platform_device *pdev) +{ + struct hwrng *rng = platform_get_drvdata(pdev); + struct bcm63xx_rng_priv *priv = to_rng_priv(rng); + + hwrng_unregister(rng); + clk_disable(priv->clk); + kfree(priv); + kfree(rng); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver bcm63xx_rng_driver = { + .probe = bcm63xx_rng_probe, + .remove = __devexit_p(bcm63xx_rng_remove), + .driver = { + .name = "bcm63xx-rng", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(bcm63xx_rng_driver); + +MODULE_AUTHOR("Florian Fainelli "); +MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3