hwrng: exynos - Add support for Exynos random number generator

This patch supports Exynos SOC's PRNG driver. Exynos's PRNG has 5 seeds and
5 random number outputs. Module is excuted under runtime power management control,
so it activates only while it's in use. Otherwise it will be suspended generally.
It was tested on PQ board by rngtest program.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 195 insertions, 0 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index f45dad39a18b..b01d67328243 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -263,3 +263,15 @@ config HW_RANDOM_PSERIES
           module will be called pseries-rng.
 
           If unsure, say Y.
+
+config HW_RANDOM_EXYNOS
+        tristate "EXYNOS HW random number generator support"
+        depends on HW_RANDOM && HAS_IOMEM && HAVE_CLK
+        ---help---
+          This driver provides kernel-side support for the Random Number
+          Generator hardware found on EXYNOS SOCs.
+
+          To compile this driver as a module, choose M here: the
+          module will be called exynos-rng.
+
+          If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index d901dfa30321..8d6d173b65e6 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
 obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o
 obj-$(CONFIG_HW_RANDOM_PPC4XX) += ppc4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o
+obj-$(CONFIG_HW_RANDOM_EXYNOS)  += exynos-rng.o
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
new file mode 100644
index 000000000000..232ba9ce579c
--- /dev/null
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -0,0 +1,182 @@
+/*
+ * exynos-rng.c - Random Number Generator driver for the exynos
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Jonghwa Lee <jonghwa3.lee@smasung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+#include <linux/err.h>
+
+#define EXYNOS_PRNG_STATUS_OFFSET       0x10
+#define EXYNOS_PRNG_SEED_OFFSET         0x140
+#define EXYNOS_PRNG_OUT1_OFFSET         0x160
+#define SEED_SETTING_DONE               BIT(1)
+#define PRNG_START                      0x18
+#define PRNG_DONE                       BIT(5)
+#define EXYNOS_AUTOSUSPEND_DELAY        100
+
+struct exynos_rng {
+        struct device *dev;
+        struct hwrng rng;
+        void __iomem *mem;
+        struct clk *clk;
+};
+
+static u32 exynos_rng_readl(struct exynos_rng *rng, u32 offset)
+{
+        return  __raw_readl(rng->mem + offset);
+}
+
+static void exynos_rng_writel(struct exynos_rng *rng, u32 val, u32 offset)
+{
+        __raw_writel(val, rng->mem + offset);
+}
+
+static int exynos_init(struct hwrng *rng)
+{
+        struct exynos_rng *exynos_rng = container_of(rng,
+                                                struct exynos_rng, rng);
+        int i;
+        int ret = 0;
+
+        pm_runtime_get_sync(exynos_rng->dev);
+
+        for (i = 0 ; i < 5 ; i++)
+                exynos_rng_writel(exynos_rng, jiffies,
+                                EXYNOS_PRNG_SEED_OFFSET + 4*i);
+
+        if (!(exynos_rng_readl(exynos_rng, EXYNOS_PRNG_STATUS_OFFSET)
+                                                 & SEED_SETTING_DONE))
+                ret = -EIO;
+
+        pm_runtime_put_noidle(exynos_rng->dev);
+
+        return ret;
+}
+
+static int exynos_read(struct hwrng *rng, void *buf,
+                                        size_t max, bool wait)
+{
+        struct exynos_rng *exynos_rng = container_of(rng,
+                                                struct exynos_rng, rng);
+        u32 *data = buf;
+
+        pm_runtime_get_sync(exynos_rng->dev);
+
+        exynos_rng_writel(exynos_rng, PRNG_START, 0);
+
+        while (!(exynos_rng_readl(exynos_rng,
+                        EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE))
+                cpu_relax();
+
+        exynos_rng_writel(exynos_rng, PRNG_DONE, EXYNOS_PRNG_STATUS_OFFSET);
+
+        *data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET);
+
+        pm_runtime_mark_last_busy(exynos_rng->dev);
+        pm_runtime_autosuspend(exynos_rng->dev);
+
+        return 4;
+}
+
+static int __devinit exynos_rng_probe(struct platform_device *pdev)
+{
+        struct exynos_rng *exynos_rng;
+
+        exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
+                                        GFP_KERNEL);
+        if (!exynos_rng)
+                return -ENOMEM;
+
+        exynos_rng->dev = &pdev->dev;
+        exynos_rng->rng.name = "exynos";
+        exynos_rng->rng.init =  exynos_init;
+        exynos_rng->rng.read = exynos_read;
+        exynos_rng->clk = devm_clk_get(&pdev->dev, "secss");
+        if (IS_ERR(exynos_rng->clk)) {
+                dev_err(&pdev->dev, "Couldn't get clock.\n");
+                return -ENOENT;
+        }
+
+        exynos_rng->mem = devm_request_and_ioremap(&pdev->dev,
+                        platform_get_resource(pdev, IORESOURCE_MEM, 0));
+        if (!exynos_rng->mem)
+                return -EBUSY;
+
+        platform_set_drvdata(pdev, exynos_rng);
+
+        pm_runtime_set_autosuspend_delay(&pdev->dev, EXYNOS_AUTOSUSPEND_DELAY);
+        pm_runtime_use_autosuspend(&pdev->dev);
+        pm_runtime_enable(&pdev->dev);
+
+        return hwrng_register(&exynos_rng->rng);
+}
+
+static int __devexit exynos_rng_remove(struct platform_device *pdev)
+{
+        struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+        hwrng_unregister(&exynos_rng->rng);
+
+        return 0;
+}
+
+static int exynos_rng_runtime_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+        clk_disable_unprepare(exynos_rng->clk);
+
+        return 0;
+}
+
+static int exynos_rng_runtime_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+        return clk_prepare_enable(exynos_rng->clk);
+}
+
+
+UNIVERSAL_DEV_PM_OPS(exynos_rng_pm_ops, exynos_rng_runtime_suspend,
+                                        exynos_rng_runtime_resume, NULL);
+
+static struct platform_driver exynos_rng_driver = {
+        .driver         = {
+                .name   = "exynos-rng",
+                .owner  = THIS_MODULE,
+                .pm     = &exynos_rng_pm_ops,
+        },
+        .probe          = exynos_rng_probe,
+        .remove         = __devexit_p(exynos_rng_remove),
+};
+
+module_platform_driver(exynos_rng_driver);
+
+MODULE_DESCRIPTION("EXYNOS 4 H/W Random Number Generator driver");
+MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
+MODULE_LICENSE("GPL");