1 files changed, 175 insertions, 0 deletions

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 <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");