From 1cfc5c76c5f48359716bd804daef2f2f7554fb4a Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 31 Jan 2012 15:12:25 +0100 Subject: [PATCH 6/6] 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/ 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(+), 0 deletions(-) create mode 100644 drivers/char/hw_random/bcm63xx-rng.c --- 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 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += ti obj-$(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 --- /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 __init 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");