hw_random: add Broadcom BCM63xx RNG driver (553072b2) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/char/hw_random/Kconfig

+14 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/char/hw_random/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/char/hw_random/bcm63xx-rng.c

0 → 100644

+175 −0

Original line number	Diff line number	Diff line
		/*
		* Broadcom BCM63xx Random Number Generator support
		*
		* Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
		* Copyright (C) 2009, Broadcom Corporation
		*
		*/
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/io.h>
		#include <linux/err.h>
		#include <linux/clk.h>
		#include <linux/platform_device.h>
		#include <linux/hw_random.h>

		#include <bcm63xx_io.h>
		#include <bcm63xx_regs.h>

		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 <florian@openwrt.org>");
		MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
		MODULE_LICENSE("GPL");