Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / char / hw_random / bcm63xx-rng.c

diff --git a/kernel/drivers/char/hw_random/bcm63xx-rng.c b/kernel/drivers/char/hw_random/bcm63xx-rng.c
new file mode 100644 (file)
index 0000000..4b31f13
--- /dev/null
+++ b/kernel/drivers/char/hw_random/bcm63xx-rng.c
@@ -0,0 +1,146 @@
+/*
+ * 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>
+
+#define RNG_CTRL                       0x00
+#define RNG_EN                         (1 << 0)
+
+#define RNG_STAT                       0x04
+#define RNG_AVAIL_MASK                 (0xff000000)
+
+#define RNG_DATA                       0x08
+#define RNG_THRES                      0x0c
+#define RNG_MASK                       0x10
+
+struct bcm63xx_rng_priv {
+       struct hwrng rng;
+       struct clk *clk;
+       void __iomem *regs;
+};
+
+#define to_rng_priv(rng)       container_of(rng, struct bcm63xx_rng_priv, rng)
+
+static int bcm63xx_rng_init(struct hwrng *rng)
+{
+       struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
+       u32 val;
+       int error;
+
+       error = clk_prepare_enable(priv->clk);
+       if (error)
+               return error;
+
+       val = __raw_readl(priv->regs + RNG_CTRL);
+       val |= RNG_EN;
+       __raw_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 = __raw_readl(priv->regs + RNG_CTRL);
+       val &= ~RNG_EN;
+       __raw_writel(val, priv->regs + RNG_CTRL);
+
+       clk_disable_unprepare(priv->clk);
+}
+
+static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
+{
+       struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
+
+       return __raw_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 = __raw_readl(priv->regs + RNG_DATA);
+
+       return 4;
+}
+
+static int 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");
+               return -ENXIO;
+       }
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->rng.name = pdev->name;
+       priv->rng.init = bcm63xx_rng_init;
+       priv->rng.cleanup = bcm63xx_rng_cleanup;
+       priv->rng.data_present = bcm63xx_rng_data_present;
+       priv->rng.data_read = bcm63xx_rng_data_read;
+
+       priv->clk = devm_clk_get(&pdev->dev, "ipsec");
+       if (IS_ERR(priv->clk)) {
+               ret = PTR_ERR(priv->clk);
+               dev_err(&pdev->dev, "no clock for device: %d\n", ret);
+               return ret;
+       }
+
+       if (!devm_request_mem_region(&pdev->dev, r->start,
+                                       resource_size(r), pdev->name)) {
+               dev_err(&pdev->dev, "request mem failed");
+               return -EBUSY;
+       }
+
+       priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
+                                       resource_size(r));
+       if (!priv->regs) {
+               dev_err(&pdev->dev, "ioremap failed");
+               return -ENOMEM;
+       }
+
+       ret = devm_hwrng_register(&pdev->dev, &priv->rng);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to register rng device: %d\n",
+                       ret);
+               return ret;
+       }
+
+       dev_info(&pdev->dev, "registered RNG driver\n");
+
+       return 0;
+}
+
+static struct platform_driver bcm63xx_rng_driver = {
+       .probe          = bcm63xx_rng_probe,
+       .driver         = {
+               .name   = "bcm63xx-rng",
+       },
+};
+
+module_platform_driver(bcm63xx_rng_driver);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
+MODULE_LICENSE("GPL");