7 files changed, 375 insertions, 4 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index c206de2951f2..2f2b08457c67 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -165,6 +165,19 @@ config HW_RANDOM_OMAP
 
           If unsure, say Y.
 
+config HW_RANDOM_OMAP3_ROM
+        tristate "OMAP3 ROM Random Number Generator support"
+        depends on HW_RANDOM && ARCH_OMAP3
+        default HW_RANDOM
+        ---help---
+          This driver provides kernel-side support for the Random Number
+          Generator hardware found on OMAP34xx processors.
+
+          To compile this driver as a module, choose M here: the
+          module will be called omap3-rom-rng.
+
+          If unsure, say Y.
+
 config HW_RANDOM_OCTEON
         tristate "Octeon Random Number Generator support"
         depends on HW_RANDOM && CAVIUM_OCTEON_SOC
@@ -327,3 +340,15 @@ config HW_RANDOM_TPM
           module will be called tpm-rng.
 
           If unsure, say Y.
+
+config HW_RANDOM_MSM
+        tristate "Qualcomm MSM Random Number Generator support"
+        depends on HW_RANDOM && ARCH_MSM
+        ---help---
+          This driver provides kernel-side support for the Random Number
+          Generator hardware found on Qualcomm MSM SoCs.
+
+          To compile this driver as a module, choose M here. the
+          module will be called msm-rng.
+
+          If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index d7d2435ff7fa..3ae7755a52e7 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -15,6 +15,7 @@ n2-rng-y := n2-drv.o n2-asm.o
 obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
 obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
 obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
+obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o
 obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
 obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
 obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
@@ -28,3 +29,4 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o
 obj-$(CONFIG_HW_RANDOM_EXYNOS)  += exynos-rng.o
 obj-$(CONFIG_HW_RANDOM_TPM) += tpm-rng.o
 obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o
+obj-$(CONFIG_HW_RANDOM_MSM) += msm-rng.o
diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c
new file mode 100644
index 000000000000..148521e51dc6
--- /dev/null
+++ b/drivers/char/hw_random/msm-rng.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 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.
+ *
+ */
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+/* Device specific register offsets */
+#define PRNG_DATA_OUT           0x0000
+#define PRNG_STATUS             0x0004
+#define PRNG_LFSR_CFG           0x0100
+#define PRNG_CONFIG             0x0104
+
+/* Device specific register masks and config values */
+#define PRNG_LFSR_CFG_MASK      0x0000ffff
+#define PRNG_LFSR_CFG_CLOCKS    0x0000dddd
+#define PRNG_CONFIG_HW_ENABLE   BIT(1)
+#define PRNG_STATUS_DATA_AVAIL  BIT(0)
+
+#define MAX_HW_FIFO_DEPTH       16
+#define MAX_HW_FIFO_SIZE        (MAX_HW_FIFO_DEPTH * 4)
+#define WORD_SZ                 4
+
+struct msm_rng {
+        void __iomem *base;
+        struct clk *clk;
+        struct hwrng hwrng;
+};
+
+#define to_msm_rng(p)   container_of(p, struct msm_rng, hwrng)
+
+static int msm_rng_enable(struct hwrng *hwrng, int enable)
+{
+        struct msm_rng *rng = to_msm_rng(hwrng);
+        u32 val;
+        int ret;
+
+        ret = clk_prepare_enable(rng->clk);
+        if (ret)
+                return ret;
+
+        if (enable) {
+                /* Enable PRNG only if it is not already enabled */
+                val = readl_relaxed(rng->base + PRNG_CONFIG);
+                if (val & PRNG_CONFIG_HW_ENABLE)
+                        goto already_enabled;
+
+                val = readl_relaxed(rng->base + PRNG_LFSR_CFG);
+                val &= ~PRNG_LFSR_CFG_MASK;
+                val |= PRNG_LFSR_CFG_CLOCKS;
+                writel(val, rng->base + PRNG_LFSR_CFG);
+
+                val = readl_relaxed(rng->base + PRNG_CONFIG);
+                val |= PRNG_CONFIG_HW_ENABLE;
+                writel(val, rng->base + PRNG_CONFIG);
+        } else {
+                val = readl_relaxed(rng->base + PRNG_CONFIG);
+                val &= ~PRNG_CONFIG_HW_ENABLE;
+                writel(val, rng->base + PRNG_CONFIG);
+        }
+
+already_enabled:
+        clk_disable_unprepare(rng->clk);
+        return 0;
+}
+
+static int msm_rng_read(struct hwrng *hwrng, void *data, size_t max, bool wait)
+{
+        struct msm_rng *rng = to_msm_rng(hwrng);
+        size_t currsize = 0;
+        u32 *retdata = data;
+        size_t maxsize;
+        int ret;
+        u32 val;
+
+        /* calculate max size bytes to transfer back to caller */
+        maxsize = min_t(size_t, MAX_HW_FIFO_SIZE, max);
+
+        /* no room for word data */
+        if (maxsize < WORD_SZ)
+                return 0;
+
+        ret = clk_prepare_enable(rng->clk);
+        if (ret)
+                return ret;
+
+        /* read random data from hardware */
+        do {
+                val = readl_relaxed(rng->base + PRNG_STATUS);
+                if (!(val & PRNG_STATUS_DATA_AVAIL))
+                        break;
+
+                val = readl_relaxed(rng->base + PRNG_DATA_OUT);
+                if (!val)
+                        break;
+
+                *retdata++ = val;
+                currsize += WORD_SZ;
+
+                /* make sure we stay on 32bit boundary */
+                if ((maxsize - currsize) < WORD_SZ)
+                        break;
+        } while (currsize < maxsize);
+
+        clk_disable_unprepare(rng->clk);
+
+        return currsize;
+}
+
+static int msm_rng_init(struct hwrng *hwrng)
+{
+        return msm_rng_enable(hwrng, 1);
+}
+
+static void msm_rng_cleanup(struct hwrng *hwrng)
+{
+        msm_rng_enable(hwrng, 0);
+}
+
+static int msm_rng_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct msm_rng *rng;
+        int ret;
+
+        rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+        if (!rng)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, rng);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        rng->base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(rng->base))
+                return PTR_ERR(rng->base);
+
+        rng->clk = devm_clk_get(&pdev->dev, "core");
+        if (IS_ERR(rng->clk))
+                return PTR_ERR(rng->clk);
+
+        rng->hwrng.name = KBUILD_MODNAME,
+        rng->hwrng.init = msm_rng_init,
+        rng->hwrng.cleanup = msm_rng_cleanup,
+        rng->hwrng.read = msm_rng_read,
+
+        ret = hwrng_register(&rng->hwrng);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register hwrng\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static int msm_rng_remove(struct platform_device *pdev)
+{
+        struct msm_rng *rng = platform_get_drvdata(pdev);
+
+        hwrng_unregister(&rng->hwrng);
+        return 0;
+}
+
+static const struct of_device_id msm_rng_of_match[] = {
+        { .compatible = "qcom,prng", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, msm_rng_of_match);
+
+static struct platform_driver msm_rng_driver = {
+        .probe = msm_rng_probe,
+        .remove = msm_rng_remove,
+        .driver = {
+                .name = KBUILD_MODNAME,
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(msm_rng_of_match),
+        }
+};
+module_platform_driver(msm_rng_driver);
+
+MODULE_ALIAS("platform:" KBUILD_MODNAME);
+MODULE_AUTHOR("The Linux Foundation");
+MODULE_DESCRIPTION("Qualcomm MSM random number generator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c
new file mode 100644
index 000000000000..c853e9e68573
--- /dev/null
+++ b/drivers/char/hw_random/omap3-rom-rng.c
@@ -0,0 +1,141 @@
+/*
+ * omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Juha Yrjola <juha.yrjola@solidboot.com>
+ *
+ * Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/hw_random.h>
+#include <linux/timer.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#define RNG_RESET                       0x01
+#define RNG_GEN_PRNG_HW_INIT            0x02
+#define RNG_GEN_HW                      0x08
+
+/* param1: ptr, param2: count, param3: flag */
+static u32 (*omap3_rom_rng_call)(u32, u32, u32);
+
+static struct timer_list idle_timer;
+static int rng_idle;
+static struct clk *rng_clk;
+
+static void omap3_rom_rng_idle(unsigned long data)
+{
+        int r;
+
+        r = omap3_rom_rng_call(0, 0, RNG_RESET);
+        if (r != 0) {
+                pr_err("reset failed: %d\n", r);
+                return;
+        }
+        clk_disable_unprepare(rng_clk);
+        rng_idle = 1;
+}
+
+static int omap3_rom_rng_get_random(void *buf, unsigned int count)
+{
+        u32 r;
+        u32 ptr;
+
+        del_timer_sync(&idle_timer);
+        if (rng_idle) {
+                clk_prepare_enable(rng_clk);
+                r = omap3_rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
+                if (r != 0) {
+                        clk_disable_unprepare(rng_clk);
+                        pr_err("HW init failed: %d\n", r);
+                        return -EIO;
+                }
+                rng_idle = 0;
+        }
+
+        ptr = virt_to_phys(buf);
+        r = omap3_rom_rng_call(ptr, count, RNG_GEN_HW);
+        mod_timer(&idle_timer, jiffies + msecs_to_jiffies(500));
+        if (r != 0)
+                return -EINVAL;
+        return 0;
+}
+
+static int omap3_rom_rng_data_present(struct hwrng *rng, int wait)
+{
+        return 1;
+}
+
+static int omap3_rom_rng_data_read(struct hwrng *rng, u32 *data)
+{
+        int r;
+
+        r = omap3_rom_rng_get_random(data, 4);
+        if (r < 0)
+                return r;
+        return 4;
+}
+
+static struct hwrng omap3_rom_rng_ops = {
+        .name           = "omap3-rom",
+        .data_present   = omap3_rom_rng_data_present,
+        .data_read      = omap3_rom_rng_data_read,
+};
+
+static int omap3_rom_rng_probe(struct platform_device *pdev)
+{
+        pr_info("initializing\n");
+
+        omap3_rom_rng_call = pdev->dev.platform_data;
+        if (!omap3_rom_rng_call) {
+                pr_err("omap3_rom_rng_call is NULL\n");
+                return -EINVAL;
+        }
+
+        setup_timer(&idle_timer, omap3_rom_rng_idle, 0);
+        rng_clk = clk_get(&pdev->dev, "ick");
+        if (IS_ERR(rng_clk)) {
+                pr_err("unable to get RNG clock\n");
+                return PTR_ERR(rng_clk);
+        }
+
+        /* Leave the RNG in reset state. */
+        clk_prepare_enable(rng_clk);
+        omap3_rom_rng_idle(0);
+
+        return hwrng_register(&omap3_rom_rng_ops);
+}
+
+static int omap3_rom_rng_remove(struct platform_device *pdev)
+{
+        hwrng_unregister(&omap3_rom_rng_ops);
+        clk_disable_unprepare(rng_clk);
+        clk_put(rng_clk);
+        return 0;
+}
+
+static struct platform_driver omap3_rom_rng_driver = {
+        .driver = {
+                .name           = "omap3-rom-rng",
+                .owner          = THIS_MODULE,
+        },
+        .probe          = omap3_rom_rng_probe,
+        .remove         = omap3_rom_rng_remove,
+};
+
+module_platform_driver(omap3_rom_rng_driver);
+
+MODULE_ALIAS("platform:omap3-rom-rng");
+MODULE_AUTHOR("Juha Yrjola");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c
index b761459a3436..ab7ffdec0ec3 100644
--- a/drivers/char/hw_random/pseries-rng.c
+++ b/drivers/char/hw_random/pseries-rng.c
@@ -24,7 +24,6 @@
 #include <linux/hw_random.h>
 #include <asm/vio.h>
 
-#define MODULE_NAME "pseries-rng"
 
 static int pseries_rng_data_read(struct hwrng *rng, u32 *data)
 {
@@ -55,7 +54,7 @@ static unsigned long pseries_rng_get_desired_dma(struct vio_dev *vdev)
 };
 
 static struct hwrng pseries_rng = {
-        .name           = MODULE_NAME,
+        .name           = KBUILD_MODNAME,
         .data_read      = pseries_rng_data_read,
 };
 
@@ -78,7 +77,7 @@ static struct vio_device_id pseries_rng_driver_ids[] = {
 MODULE_DEVICE_TABLE(vio, pseries_rng_driver_ids);
 
 static struct vio_driver pseries_rng_driver = {
-        .name = MODULE_NAME,
+        .name = KBUILD_MODNAME,
         .probe = pseries_rng_probe,
         .remove = pseries_rng_remove,
         .get_desired_dma = pseries_rng_get_desired_dma,
diff --git a/drivers/char/hw_random/via-rng.c b/drivers/char/hw_random/via-rng.c
index e737772ad69a..de5a6dcfb3e2 100644
--- a/drivers/char/hw_random/via-rng.c
+++ b/drivers/char/hw_random/via-rng.c
@@ -221,7 +221,7 @@ static void __exit mod_exit(void)
 module_init(mod_init);
 module_exit(mod_exit);
 
-static struct x86_cpu_id via_rng_cpu_id[] = {
+static struct x86_cpu_id __maybe_unused via_rng_cpu_id[] = {
         X86_FEATURE_MATCH(X86_FEATURE_XSTORE),
         {}
 };
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 40cc0cf2ded6..e6939e13e338 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -664,6 +664,13 @@ static struct dmi_system_id __initdata i8k_dmi_table[] = {
                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
                 },
         },
+        {
+                .ident = "Dell XPS421",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
+                },
+        },
         { }
 };