Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Pull crypto update from Herbert Xu:
 "Here is the crypto update for 4.1:

  New interfaces:
   - user-space interface for AEAD
   - user-space interface for RNG (i.e., pseudo RNG)

  New hashes:
   - ARMv8 SHA1/256
   - ARMv8 AES
   - ARMv8 GHASH
   - ARM assembler and NEON SHA256
   - MIPS OCTEON SHA1/256/512
   - MIPS img-hash SHA1/256 and MD5
   - Power 8 VMX AES/CBC/CTR/GHASH
   - PPC assembler AES, SHA1/256 and MD5
   - Broadcom IPROC RNG driver

  Cleanups/fixes:
   - prevent internal helper algos from being exposed to user-space
   - merge common code from assembly/C SHA implementations
   - misc fixes"

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (169 commits)
  crypto: arm - workaround for building with old binutils
  crypto: arm/sha256 - avoid sha256 code on ARMv7-M
  crypto: x86/sha512_ssse3 - move SHA-384/512 SSSE3 implementation to base layer
  crypto: x86/sha256_ssse3 - move SHA-224/256 SSSE3 implementation to base layer
  crypto: x86/sha1_ssse3 - move SHA-1 SSSE3 implementation to base layer
  crypto: arm64/sha2-ce - move SHA-224/256 ARMv8 implementation to base layer
  crypto: arm64/sha1-ce - move SHA-1 ARMv8 implementation to base layer
  crypto: arm/sha2-ce - move SHA-224/256 ARMv8 implementation to base layer
  crypto: arm/sha256 - move SHA-224/256 ASM/NEON implementation to base layer
  crypto: arm/sha1-ce - move SHA-1 ARMv8 implementation to base layer
  crypto: arm/sha1_neon - move SHA-1 NEON implementation to base layer
  crypto: arm/sha1 - move SHA-1 ARM asm implementation to base layer
  crypto: sha512-generic - move to generic glue implementation
  crypto: sha256-generic - move to generic glue implementation
  crypto: sha1-generic - move to generic glue implementation
  crypto: sha512 - implement base layer for SHA-512
  crypto: sha256 - implement base layer for SHA-256
  crypto: sha1 - implement base layer for SHA-1
  crypto: api - remove instance when test failed
  crypto: api - Move alg ref count init to crypto_check_alg
  ...

11 files changed, 367 insertions, 115 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index de57b38..f48cf11 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -101,6 +101,19 @@ config HW_RANDOM_BCM2835
 
 	  If unsure, say Y.
 
+config HW_RANDOM_IPROC_RNG200
+	tristate "Broadcom iProc RNG200 support"
+	depends on ARCH_BCM_IPROC
+	default HW_RANDOM
+	---help---
+	  This driver provides kernel-side support for the RNG200
+	  hardware found on the Broadcom iProc SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called iproc-rng200
+
+	  If unsure, say Y.
+
 config HW_RANDOM_GEODE
 	tristate "AMD Geode HW Random Number Generator support"
 	depends on X86_32 && PCI
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 0b4cd57..055bb01 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -28,5 +28,6 @@ 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-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o
 obj-$(CONFIG_HW_RANDOM_MSM) += msm-rng.o
 obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
diff --git a/drivers/char/hw_random/bcm63xx-rng.c b/drivers/char/hw_random/bcm63xx-rng.c
index ba6a65a..d1494ec 100644
--- a/drivers/char/hw_random/bcm63xx-rng.c
+++ b/drivers/char/hw_random/bcm63xx-rng.c
@@ -13,24 +13,37 @@
 #include <linux/platform_device.h>
 #include <linux/hw_random.h>
 
-#include <bcm63xx_io.h>
-#include <bcm63xx_regs.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)	((struct bcm63xx_rng_priv *)rng->priv)
+#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 = bcm_readl(priv->regs + RNG_CTRL);
+	val = __raw_readl(priv->regs + RNG_CTRL);
 	val |= RNG_EN;
-	bcm_writel(val, priv->regs + RNG_CTRL);
+	__raw_writel(val, priv->regs + RNG_CTRL);
 
 	return 0;
 }
@@ -40,23 +53,25 @@ 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 = __raw_readl(priv->regs + RNG_CTRL);
 	val &= ~RNG_EN;
-	bcm_writel(val, priv->regs + RNG_CTRL);
+	__raw_writel(val, priv->regs + RNG_CTRL);
+
+	clk_didsable_unprepare(prov->clk);
 }
 
 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;
+	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 = bcm_readl(priv->regs + RNG_DATA);
+	*data = __raw_readl(priv->regs + RNG_DATA);
 
 	return 4;
 }
@@ -72,94 +87,53 @@ static int bcm63xx_rng_probe(struct platform_device *pdev)
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
 		dev_err(&pdev->dev, "no iomem resource\n");
-		ret = -ENXIO;
-		goto out;
+		return -ENXIO;
 	}
 
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		dev_err(&pdev->dev, "no memory for private structure\n");
-		ret = -ENOMEM;
-		goto out;
+	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;
+	prov->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)) {
+		error = PTR_ERR(priv->clk);
+		dev_err(&pdev->dev, "no clock for device: %d\n", error);
+		return error;
 	}
 
-	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;
+		return -EBUSY;
 	}
 
 	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;
+		return -ENOMEM;
 	}
 
-	clk_enable(clk);
-
-	ret = hwrng_register(rng);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register rng device\n");
-		goto out_clk_disable;
+	error = devm_hwrng_register(&pdev->dev, &priv->rng);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register rng device: %d\n",
+			error);
+		return error;
 	}
 
 	dev_info(&pdev->dev, "registered RNG driver\n");
 
 	return 0;
-
-out_clk_disable:
-	clk_disable(clk);
-out_free_rng:
-	kfree(rng);
-out_free_priv:
-	kfree(priv);
-out:
-	return ret;
-}
-
-static int 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);
-
-	return 0;
 }
 
 static struct platform_driver bcm63xx_rng_driver = {
 	.probe		= bcm63xx_rng_probe,
-	.remove		= bcm63xx_rng_remove,
 	.driver		= {
 		.name	= "bcm63xx-rng",
 	},
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 32a8a86..571ef61 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -179,7 +179,8 @@ skip_init:
 	add_early_randomness(rng);
 
 	current_quality = rng->quality ? : default_quality;
-	current_quality &= 1023;
+	if (current_quality > 1024)
+		current_quality = 1024;
 
 	if (current_quality == 0 && hwrng_fill)
 		kthread_stop(hwrng_fill);
@@ -536,6 +537,48 @@ void hwrng_unregister(struct hwrng *rng)
 }
 EXPORT_SYMBOL_GPL(hwrng_unregister);
 
+static void devm_hwrng_release(struct device *dev, void *res)
+{
+	hwrng_unregister(*(struct hwrng **)res);
+}
+
+static int devm_hwrng_match(struct device *dev, void *res, void *data)
+{
+	struct hwrng **r = res;
+
+	if (WARN_ON(!r || !*r))
+		return 0;
+
+	return *r == data;
+}
+
+int devm_hwrng_register(struct device *dev, struct hwrng *rng)
+{
+	struct hwrng **ptr;
+	int error;
+
+	ptr = devres_alloc(devm_hwrng_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	error = hwrng_register(rng);
+	if (error) {
+		devres_free(ptr);
+		return error;
+	}
+
+	*ptr = rng;
+	devres_add(dev, ptr);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_hwrng_register);
+
+void devm_hwrng_unregister(struct device *dev, struct hwrng *rng)
+{
+	devres_release(dev, devm_hwrng_release, devm_hwrng_match, rng);
+}
+EXPORT_SYMBOL_GPL(devm_hwrng_unregister);
+
 static int __init hwrng_modinit(void)
 {
 	return register_miscdev();
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
index fed0830..dc4701f 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -131,16 +131,7 @@ static int exynos_rng_probe(struct platform_device *pdev)
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	return hwrng_register(&exynos_rng->rng);
-}
-
-static int exynos_rng_remove(struct platform_device *pdev)
-{
-	struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
-
-	hwrng_unregister(&exynos_rng->rng);
-
-	return 0;
+	return devm_hwrng_register(&pdev->dev, &exynos_rng->rng);
 }
 
 #ifdef CONFIG_PM
@@ -172,7 +163,6 @@ static struct platform_driver exynos_rng_driver = {
 		.pm	= &exynos_rng_pm_ops,
 	},
 	.probe		= exynos_rng_probe,
-	.remove		= exynos_rng_remove,
 };
 
 module_platform_driver(exynos_rng_driver);
diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
new file mode 100644
index 0000000..3eaf7cb
--- /dev/null
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -0,0 +1,239 @@
+/*
+* Copyright (C) 2015 Broadcom Corporation
+*
+* 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 version 2.
+*
+* This program is distributed "as is" WITHOUT ANY WARRANTY of any
+* kind, whether express or implied; without even the implied warranty
+* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+/*
+ * DESCRIPTION: The Broadcom iProc RNG200 Driver
+ */
+
+#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/delay.h>
+
+/* Registers */
+#define RNG_CTRL_OFFSET					0x00
+#define RNG_CTRL_RNG_RBGEN_MASK				0x00001FFF
+#define RNG_CTRL_RNG_RBGEN_ENABLE			0x00000001
+#define RNG_CTRL_RNG_RBGEN_DISABLE			0x00000000
+
+#define RNG_SOFT_RESET_OFFSET				0x04
+#define RNG_SOFT_RESET					0x00000001
+
+#define RBG_SOFT_RESET_OFFSET				0x08
+#define RBG_SOFT_RESET					0x00000001
+
+#define RNG_INT_STATUS_OFFSET				0x18
+#define RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK	0x80000000
+#define RNG_INT_STATUS_STARTUP_TRANSITIONS_MET_IRQ_MASK	0x00020000
+#define RNG_INT_STATUS_NIST_FAIL_IRQ_MASK		0x00000020
+#define RNG_INT_STATUS_TOTAL_BITS_COUNT_IRQ_MASK	0x00000001
+
+#define RNG_FIFO_DATA_OFFSET				0x20
+
+#define RNG_FIFO_COUNT_OFFSET				0x24
+#define RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK		0x000000FF
+
+struct iproc_rng200_dev {
+	struct hwrng rng;
+	void __iomem *base;
+};
+
+#define to_rng_priv(rng)	container_of(rng, struct iproc_rng200_dev, rng)
+
+static void iproc_rng200_restart(void __iomem *rng_base)
+{
+	uint32_t val;
+
+	/* Disable RBG */
+	val = ioread32(rng_base + RNG_CTRL_OFFSET);
+	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
+	val |= RNG_CTRL_RNG_RBGEN_DISABLE;
+	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
+
+	/* Clear all interrupt status */
+	iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET);
+
+	/* Reset RNG and RBG */
+	val = ioread32(rng_base + RBG_SOFT_RESET_OFFSET);
+	val |= RBG_SOFT_RESET;
+	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RNG_SOFT_RESET_OFFSET);
+	val |= RNG_SOFT_RESET;
+	iowrite32(val, rng_base + RNG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RNG_SOFT_RESET_OFFSET);
+	val &= ~RNG_SOFT_RESET;
+	iowrite32(val, rng_base + RNG_SOFT_RESET_OFFSET);
+
+	val = ioread32(rng_base + RBG_SOFT_RESET_OFFSET);
+	val &= ~RBG_SOFT_RESET;
+	iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET);
+
+	/* Enable RBG */
+	val = ioread32(rng_base + RNG_CTRL_OFFSET);
+	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
+	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
+	iowrite32(val, rng_base + RNG_CTRL_OFFSET);
+}
+
+static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
+			     bool wait)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+	uint32_t num_remaining = max;
+	uint32_t status;
+
+	#define MAX_RESETS_PER_READ	1
+	uint32_t num_resets = 0;
+
+	#define MAX_IDLE_TIME	(1 * HZ)
+	unsigned long idle_endtime = jiffies + MAX_IDLE_TIME;
+
+	while ((num_remaining > 0) && time_before(jiffies, idle_endtime)) {
+
+		/* Is RNG sane? If not, reset it. */
+		status = ioread32(priv->base + RNG_INT_STATUS_OFFSET);
+		if ((status & (RNG_INT_STATUS_MASTER_FAIL_LOCKOUT_IRQ_MASK |
+			RNG_INT_STATUS_NIST_FAIL_IRQ_MASK)) != 0) {
+
+			if (num_resets >= MAX_RESETS_PER_READ)
+				return max - num_remaining;
+
+			iproc_rng200_restart(priv->base);
+			num_resets++;
+		}
+
+		/* Are there any random numbers available? */
+		if ((ioread32(priv->base + RNG_FIFO_COUNT_OFFSET) &
+				RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK) > 0) {
+
+			if (num_remaining >= sizeof(uint32_t)) {
+				/* Buffer has room to store entire word */
+				*(uint32_t *)buf = ioread32(priv->base +
+							RNG_FIFO_DATA_OFFSET);
+				buf += sizeof(uint32_t);
+				num_remaining -= sizeof(uint32_t);
+			} else {
+				/* Buffer can only store partial word */
+				uint32_t rnd_number = ioread32(priv->base +
+							RNG_FIFO_DATA_OFFSET);
+				memcpy(buf, &rnd_number, num_remaining);
+				buf += num_remaining;
+				num_remaining = 0;
+			}
+
+			/* Reset the IDLE timeout */
+			idle_endtime = jiffies + MAX_IDLE_TIME;
+		} else {
+			if (!wait)
+				/* Cannot wait, return immediately */
+				return max - num_remaining;
+
+			/* Can wait, give others chance to run */
+			usleep_range(min(num_remaining * 10, 500U), 500);
+		}
+	}
+
+	return max - num_remaining;
+}
+
+static int iproc_rng200_init(struct hwrng *rng)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+	uint32_t val;
+
+	/* Setup RNG. */
+	val = ioread32(priv->base + RNG_CTRL_OFFSET);
+	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
+	val |= RNG_CTRL_RNG_RBGEN_ENABLE;
+	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
+
+	return 0;
+}
+
+static void iproc_rng200_cleanup(struct hwrng *rng)
+{
+	struct iproc_rng200_dev *priv = to_rng_priv(rng);
+	uint32_t val;
+
+	/* Disable RNG hardware */
+	val = ioread32(priv->base + RNG_CTRL_OFFSET);
+	val &= ~RNG_CTRL_RNG_RBGEN_MASK;
+	val |= RNG_CTRL_RNG_RBGEN_DISABLE;
+	iowrite32(val, priv->base + RNG_CTRL_OFFSET);
+}
+
+static int iproc_rng200_probe(struct platform_device *pdev)
+{
+	struct iproc_rng200_dev *priv;
+	struct resource *res;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* Map peripheral */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "failed to get rng resources\n");
+		return -EINVAL;
+	}
+
+	priv->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->base)) {
+		dev_err(dev, "failed to remap rng regs\n");
+		return PTR_ERR(priv->base);
+	}
+
+	priv->rng.name = "iproc-rng200",
+	priv->rng.read = iproc_rng200_read,
+	priv->rng.init = iproc_rng200_init,
+	priv->rng.cleanup = iproc_rng200_cleanup,
+
+	/* Register driver */
+	ret = devm_hwrng_register(dev, &priv->rng);
+	if (ret) {
+		dev_err(dev, "hwrng registration failed\n");
+		return ret;
+	}
+
+	dev_info(dev, "hwrng registered\n");
+
+	return 0;
+}
+
+static const struct of_device_id iproc_rng200_of_match[] = {
+	{ .compatible = "brcm,iproc-rng200", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, iproc_rng200_of_match);
+
+static struct platform_driver iproc_rng200_driver = {
+	.driver = {
+		.name		= "iproc-rng200",
+		.of_match_table = iproc_rng200_of_match,
+	},
+	.probe		= iproc_rng200_probe,
+};
+module_platform_driver(iproc_rng200_driver);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("iProc RNG200 Random Number Generator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c
index cea1c70..96fb986 100644
--- a/drivers/char/hw_random/msm-rng.c
+++ b/drivers/char/hw_random/msm-rng.c
@@ -157,7 +157,7 @@ static int msm_rng_probe(struct platform_device *pdev)
 	rng->hwrng.cleanup = msm_rng_cleanup,
 	rng->hwrng.read = msm_rng_read,
 
-	ret = hwrng_register(&rng->hwrng);
+	ret = devm_hwrng_register(&pdev->dev, &rng->hwrng);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register hwrng\n");
 		return ret;
@@ -166,14 +166,6 @@ static int msm_rng_probe(struct platform_device *pdev)
 	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", },
 	{}
@@ -182,7 +174,6 @@ 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,
 		.of_match_table = of_match_ptr(msm_rng_of_match),
diff --git a/drivers/char/hw_random/octeon-rng.c b/drivers/char/hw_random/octeon-rng.c
index be1c3f6..6234a4a 100644
--- a/drivers/char/hw_random/octeon-rng.c
+++ b/drivers/char/hw_random/octeon-rng.c
@@ -105,7 +105,7 @@ static int octeon_rng_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int __exit octeon_rng_remove(struct platform_device *pdev)
+static int octeon_rng_remove(struct platform_device *pdev)
 {
 	struct hwrng *rng = platform_get_drvdata(pdev);
 
@@ -119,7 +119,7 @@ static struct platform_driver octeon_rng_driver = {
 		.name		= "octeon_rng",
 	},
 	.probe		= octeon_rng_probe,
-	.remove		= __exit_p(octeon_rng_remove),
+	.remove		= octeon_rng_remove,
 };
 
 module_platform_driver(octeon_rng_driver);
diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index d14dcf7..8a1432e 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -236,7 +236,7 @@ static int omap4_rng_init(struct omap_rng_dev *priv)
 	u32 val;
 
 	/* Return if RNG is already running. */
-	if (omap_rng_read(priv, RNG_CONFIG_REG) & RNG_CONTROL_ENABLE_TRNG_MASK)
+	if (omap_rng_read(priv, RNG_CONTROL_REG) & RNG_CONTROL_ENABLE_TRNG_MASK)
 		return 0;
 
 	val = RNG_CONFIG_MIN_REFIL_CYCLES << RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT;
@@ -262,7 +262,7 @@ static void omap4_rng_cleanup(struct omap_rng_dev *priv)
 
 	val = omap_rng_read(priv, RNG_CONTROL_REG);
 	val &= ~RNG_CONTROL_ENABLE_TRNG_MASK;
-	omap_rng_write(priv, RNG_CONFIG_REG, val);
+	omap_rng_write(priv, RNG_CONTROL_REG, val);
 }
 
 static irqreturn_t omap4_rng_irq(int irq, void *dev_id)
@@ -408,7 +408,7 @@ err_ioremap:
 	return ret;
 }
 
-static int __exit omap_rng_remove(struct platform_device *pdev)
+static int omap_rng_remove(struct platform_device *pdev)
 {
 	struct omap_rng_dev *priv = platform_get_drvdata(pdev);
 
@@ -422,9 +422,7 @@ static int __exit omap_rng_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-
-static int omap_rng_suspend(struct device *dev)
+static int __maybe_unused omap_rng_suspend(struct device *dev)
 {
 	struct omap_rng_dev *priv = dev_get_drvdata(dev);
 
@@ -434,7 +432,7 @@ static int omap_rng_suspend(struct device *dev)
 	return 0;
 }
 
-static int omap_rng_resume(struct device *dev)
+static int __maybe_unused omap_rng_resume(struct device *dev)
 {
 	struct omap_rng_dev *priv = dev_get_drvdata(dev);
 
@@ -445,22 +443,15 @@ static int omap_rng_resume(struct device *dev)
 }
 
 static SIMPLE_DEV_PM_OPS(omap_rng_pm, omap_rng_suspend, omap_rng_resume);
-#define	OMAP_RNG_PM	(&omap_rng_pm)
-
-#else
-
-#define	OMAP_RNG_PM	NULL
-
-#endif
 
 static struct platform_driver omap_rng_driver = {
 	.driver = {
 		.name		= "omap_rng",
-		.pm		= OMAP_RNG_PM,
+		.pm		= &omap_rng_pm,
 		.of_match_table = of_match_ptr(omap_rng_of_match),
 	},
 	.probe		= omap_rng_probe,
-	.remove		= __exit_p(omap_rng_remove),
+	.remove		= omap_rng_remove,
 };
 
 module_platform_driver(omap_rng_driver);
diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c
index bcf86f9..63ce51d 100644
--- a/drivers/char/hw_random/pseries-rng.c
+++ b/drivers/char/hw_random/pseries-rng.c
@@ -61,13 +61,13 @@ static struct hwrng pseries_rng = {
 	.read		= pseries_rng_read,
 };
 
-static int __init pseries_rng_probe(struct vio_dev *dev,
+static int pseries_rng_probe(struct vio_dev *dev,
 		const struct vio_device_id *id)
 {
 	return hwrng_register(&pseries_rng);
 }
 
-static int __exit pseries_rng_remove(struct vio_dev *dev)
+static int pseries_rng_remove(struct vio_dev *dev)
 {
 	hwrng_unregister(&pseries_rng);
 	return 0;
diff --git a/drivers/char/hw_random/xgene-rng.c b/drivers/char/hw_random/xgene-rng.c
index 23caa05..c37cf75 100644
--- a/drivers/char/hw_random/xgene-rng.c
+++ b/drivers/char/hw_random/xgene-rng.c
@@ -21,6 +21,7 @@
  *
  */
 
+#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/hw_random.h>
@@ -310,6 +311,14 @@ static int xgene_rng_init(struct hwrng *rng)
 	return 0;
 }
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_rng_acpi_match[] = {
+	{ "APMC0D18", },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, xgene_rng_acpi_match);
+#endif
+
 static struct hwrng xgene_rng_func = {
 	.name		= "xgene-rng",
 	.init		= xgene_rng_init,
@@ -415,6 +424,7 @@ static struct platform_driver xgene_rng_driver = {
 	.driver = {
 		.name		= "xgene-rng",
 		.of_match_table = xgene_rng_of_match,
+		.acpi_match_table = ACPI_PTR(xgene_rng_acpi_match),
 	},
 };