hwrng: bcm2835 - Add Broadcom BCM2835 RNG driver

This adds a driver for random number generator present on Broadcom BCM2835 SoC,
used in Raspberry Pi and Roku 2 devices.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: linux-rpi-kernel@lists.infradead.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/rng/brcm,bcm2835.txt b/Documentation/devicetree/bindings/rng/brcm,bcm2835.txt
new file mode 100644 (file)
index 0000000..07ccdaa
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/brcm,bcm2835.txt
@@ -0,0 +1,13 @@
+BCM2835 Random number generator
+
+Required properties:
+
+- compatible : should be "brcm,bcm2835-rng"
+- reg : Specifies base physical address and size of the registers.
+
+Example:
+
+rng {
+        compatible = "brcm,bcm2835-rng";
+        reg = <0x7e104000 0x10>;
+};

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index c5a0262251bceed1a0f486bfd76ece26ae5106a8..2f9dbf7568fb5fd2d4e42420e6d98068aea88e6a 100644 (file)
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -86,6 +86,18 @@ config HW_RANDOM_BCM63XX
 
          If unusure, say Y.
 
+config HW_RANDOM_BCM2835
+       tristate "Broadcom BCM2835 Random Number Generator support"
+       depends on HW_RANDOM && ARCH_BCM2835
+       default HW_RANDOM
+       ---help---
+         This driver provides kernel-side support for the Random Number
+         Generator hardware found on the Broadcom BCM2835 SoCs.
+
+         To compile this driver as a module, choose M here: the
+         module will be called bcm2835-rng
+
+         If unsure, say Y.
 
 config HW_RANDOM_GEODE
        tristate "AMD Geode HW Random Number Generator support"

diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 1fd7eec9fbf6421ace05971f95671095917bf4fa..bed467c9300e6ec99240a262585d6bf9409a0b94 100644 (file)
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
 obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o
 obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o
+obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o

diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
new file mode 100644 (file)
index 0000000..eb7f147
--- /dev/null
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -0,0 +1,113 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ * Copyright (c) 2013 Lubomir Rintel
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License ("GPL")
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/hw_random.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+
+#define RNG_CTRL       0x0
+#define RNG_STATUS     0x4
+#define RNG_DATA       0x8
+
+/* enable rng */
+#define RNG_RBGEN      0x1
+
+/* the initial numbers generated are "less random" so will be discarded */
+#define RNG_WARMUP_COUNT 0x40000
+
+static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max,
+                              bool wait)
+{
+       void __iomem *rng_base = (void __iomem *)rng->priv;
+
+       while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) {
+               if (!wait)
+                       return 0;
+               cpu_relax();
+       }
+
+       *(u32 *)buf = __raw_readl(rng_base + RNG_DATA);
+       return sizeof(u32);
+}
+
+static struct hwrng bcm2835_rng_ops = {
+       .name   = "bcm2835",
+       .read   = bcm2835_rng_read,
+};
+
+static int bcm2835_rng_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct device_node *np = dev->of_node;
+       void __iomem *rng_base;
+       int err;
+
+       /* map peripheral */
+       rng_base = of_iomap(np, 0);
+       if (!rng_base) {
+               dev_err(dev, "failed to remap rng regs");
+               return -ENODEV;
+       }
+       bcm2835_rng_ops.priv = (unsigned long)rng_base;
+
+       /* register driver */
+       err = hwrng_register(&bcm2835_rng_ops);
+       if (err) {
+               dev_err(dev, "hwrng registration failed\n");
+               iounmap(rng_base);
+       } else {
+               dev_info(dev, "hwrng registered\n");
+
+               /* set warm-up count & enable */
+               __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS);
+               __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL);
+       }
+       return err;
+}
+
+static int bcm2835_rng_remove(struct platform_device *pdev)
+{
+       void __iomem *rng_base = (void __iomem *)bcm2835_rng_ops.priv;
+
+       /* disable rng hardware */
+       __raw_writel(0, rng_base + RNG_CTRL);
+
+       /* unregister driver */
+       hwrng_unregister(&bcm2835_rng_ops);
+       iounmap(rng_base);
+
+       return 0;
+}
+
+static const struct of_device_id bcm2835_rng_of_match[] = {
+       { .compatible = "brcm,bcm2835-rng", },
+       {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match);
+
+static struct platform_driver bcm2835_rng_driver = {
+       .driver = {
+               .name = "bcm2835-rng",
+               .owner = THIS_MODULE,
+               .of_match_table = bcm2835_rng_of_match,
+       },
+       .probe          = bcm2835_rng_probe,
+       .remove         = bcm2835_rng_remove,
+};
+module_platform_driver(bcm2835_rng_driver);
+
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
+MODULE_DESCRIPTION("BCM2835 Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPLv2");