hw_random: add Broadcom BCM63xx RNG driver

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: mpm@selenic.com
Cc: herbert@gondor.apana.org.au
Patchwork: https://patchwork.linux-mips.org/patch/3327/
Patchwork: https://patchwork.linux-mips.org/patch/4072/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index f45dad3..6640311 100644 (file)
--- 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

diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index d901dfa..67f57bf 100644 (file)
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -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

diff --git a/drivers/char/hw_random/bcm63xx-rng.c b/drivers/char/hw_random/bcm63xx-rng.c
new file mode 100644 (file)
index 0000000..aec6a42
--- /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");