diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-3.3/105-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-3.3/105-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.3/105-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch b/target/linux/brcm63xx/patches-3.3/105-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch new file mode 100644 index 0000000000..a6a2bc0cd5 --- /dev/null +++ b/target/linux/brcm63xx/patches-3.3/105-hw_random-add-Broadcom-BCM63xx-RNG-driver.patch @@ -0,0 +1,224 @@ +From 21a474b37f905387d8908384a24c13d4f8513113 Mon Sep 17 00:00:00 2001 +From: Florian Fainelli <florian@openwrt.org> +Date: Wed, 25 Jan 2012 17:40:02 +0100 +Subject: [PATCH 18/63] hw_random: add Broadcom BCM63xx RNG driver + +Signed-off-by: Florian Fainelli <florian@openwrt.org> +--- + 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 <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_trng_priv { ++ struct clk *clk; ++ void __iomem *regs; ++}; ++ ++#define to_trng_priv(rng) ((struct bcm63xx_trng_priv *)rng->priv) ++ ++static int bcm63xx_trng_init(struct hwrng *rng) ++{ ++ struct bcm63xx_trng_priv *priv = to_trng_priv(rng); ++ u32 val; ++ ++ val = bcm_readl(priv->regs + TRNG_CTRL); ++ val |= TRNG_EN; ++ bcm_writel(val, priv->regs + TRNG_CTRL); ++ ++ return 0; ++} ++ ++static void bcm63xx_trng_cleanup(struct hwrng *rng) ++{ ++ struct bcm63xx_trng_priv *priv = to_trng_priv(rng); ++ u32 val; ++ ++ val = bcm_readl(priv->regs + TRNG_CTRL); ++ val &= ~TRNG_EN; ++ bcm_writel(val, priv->regs + TRNG_CTRL); ++} ++ ++static int bcm63xx_trng_data_present(struct hwrng *rng, int wait) ++{ ++ struct bcm63xx_trng_priv *priv = to_trng_priv(rng); ++ ++ return bcm_readl(priv->regs + TRNG_STAT) & TRNG_AVAIL_MASK; ++} ++ ++static int bcm63xx_trng_data_read(struct hwrng *rng, u32 *data) ++{ ++ struct bcm63xx_trng_priv *priv = to_trng_priv(rng); ++ ++ *data = bcm_readl(priv->regs + TRNG_DATA); ++ ++ return 4; ++} ++ ++static int __init bcm63xx_trng_probe(struct platform_device *pdev) ++{ ++ struct resource *r; ++ struct clk *clk; ++ int ret; ++ struct bcm63xx_trng_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_trng_init; ++ rng->cleanup = bcm63xx_trng_cleanup; ++ rng->data_present = bcm63xx_trng_data_present; ++ rng->data_read = bcm63xx_trng_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_trng_remove(struct platform_device *pdev) ++{ ++ struct hwrng *rng = platform_get_drvdata(pdev); ++ struct bcm63xx_trng_priv *priv = to_trng_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_trng_driver = { ++ .probe = bcm63xx_trng_probe, ++ .remove = __devexit_p(bcm63xx_trng_remove), ++ .driver = { ++ .name = "bcm63xx-trng", ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++module_platform_driver(bcm63xx_trng_driver); ++ ++MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); ++MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver"); ++MODULE_LICENSE("GPL"); |