4 files changed, 201 insertions, 42 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index ce66a70184f7..87060266ef91 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -126,6 +126,19 @@ config HW_RANDOM_OMAP
 
  	  If unsure, say Y.
 
+config HW_RANDOM_OCTEON
+	tristate "Octeon Random Number Generator support"
+	depends on HW_RANDOM && CPU_CAVIUM_OCTEON
+	default HW_RANDOM
+	---help---
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Octeon processors.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called octeon-rng.
+
+	  If unsure, say Y.
+
 config HW_RANDOM_PASEMI
 	tristate "PA Semi HW Random Number Generator support"
 	depends on HW_RANDOM && PPC_PASEMI
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 676828ba8123..5eeb1303f0d0 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
 obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
 obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
 obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
+obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
diff --git a/drivers/char/hw_random/octeon-rng.c b/drivers/char/hw_random/octeon-rng.c
new file mode 100644
index 000000000000..54b0d9ba65cf
--- /dev/null
+++ b/drivers/char/hw_random/octeon-rng.c
@@ -0,0 +1,147 @@
+/*
+ * Hardware Random Number Generator support for Cavium Networks
+ * Octeon processor family.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Cavium Networks
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-rnm-defs.h>
+
+struct octeon_rng {
+	struct hwrng ops;
+	void __iomem *control_status;
+	void __iomem *result;
+};
+
+static int octeon_rng_init(struct hwrng *rng)
+{
+	union cvmx_rnm_ctl_status ctl;
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	ctl.u64 = 0;
+	ctl.s.ent_en = 1; /* Enable the entropy source.  */
+	ctl.s.rng_en = 1; /* Enable the RNG hardware.  */
+	cvmx_write_csr((u64)p->control_status, ctl.u64);
+	return 0;
+}
+
+static void octeon_rng_cleanup(struct hwrng *rng)
+{
+	union cvmx_rnm_ctl_status ctl;
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	ctl.u64 = 0;
+	/* Disable everything.  */
+	cvmx_write_csr((u64)p->control_status, ctl.u64);
+}
+
+static int octeon_rng_data_read(struct hwrng *rng, u32 *data)
+{
+	struct octeon_rng *p = container_of(rng, struct octeon_rng, ops);
+
+	*data = cvmx_read64_uint32((u64)p->result);
+	return sizeof(u32);
+}
+
+static int __devinit octeon_rng_probe(struct platform_device *pdev)
+{
+	struct resource *res_ports;
+	struct resource *res_result;
+	struct octeon_rng *rng;
+	int ret;
+	struct hwrng ops = {
+		.name = "octeon",
+		.init = octeon_rng_init,
+		.cleanup = octeon_rng_cleanup,
+		.data_read = octeon_rng_data_read
+	};
+
+	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
+	if (!rng)
+		return -ENOMEM;
+
+	res_ports = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_ports)
+		goto err_ports;
+
+	res_result = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res_result)
+		goto err_ports;
+
+
+	rng->control_status = devm_ioremap_nocache(&pdev->dev,
+						   res_ports->start,
+						   sizeof(u64));
+	if (!rng->control_status)
+		goto err_ports;
+
+	rng->result = devm_ioremap_nocache(&pdev->dev,
+					   res_result->start,
+					   sizeof(u64));
+	if (!rng->result)
+		goto err_r;
+
+	rng->ops = ops;
+
+	dev_set_drvdata(&pdev->dev, &rng->ops);
+	ret = hwrng_register(&rng->ops);
+	if (ret)
+		goto err;
+
+	dev_info(&pdev->dev, "Octeon Random Number Generator\n");
+
+	return 0;
+err:
+	devm_iounmap(&pdev->dev, rng->control_status);
+err_r:
+	devm_iounmap(&pdev->dev, rng->result);
+err_ports:
+	devm_kfree(&pdev->dev, rng);
+	return -ENOENT;
+}
+
+static int __exit octeon_rng_remove(struct platform_device *pdev)
+{
+	struct hwrng *rng = dev_get_drvdata(&pdev->dev);
+
+	hwrng_unregister(rng);
+
+	return 0;
+}
+
+static struct platform_driver octeon_rng_driver = {
+	.driver = {
+		.name		= "octeon_rng",
+		.owner		= THIS_MODULE,
+	},
+	.probe		= octeon_rng_probe,
+	.remove		= __exit_p(octeon_rng_remove),
+};
+
+static int __init octeon_rng_mod_init(void)
+{
+	return platform_driver_register(&octeon_rng_driver);
+}
+
+static void __exit octeon_rng_mod_exit(void)
+{
+	platform_driver_unregister(&octeon_rng_driver);
+}
+
+module_init(octeon_rng_mod_init);
+module_exit(octeon_rng_mod_exit);
+
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 645237bda682..0491cdf63f2a 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -864,71 +864,67 @@ static const struct file_operations kmsg_fops = {
 	.write =	kmsg_write,
 };
 
-static const struct {
-	unsigned int		minor;
-	char			*name;
-	umode_t			mode;
-	const struct file_operations	*fops;
-	struct backing_dev_info	*dev_info;
-} devlist[] = { /* list of minor devices */
-	{1, "mem",     S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops,
-		&directly_mappable_cdev_bdi},
+static const struct memdev {
+	const char *name;
+	const struct file_operations *fops;
+	struct backing_dev_info *dev_info;
+} devlist[] = {
+	[ 1] = { "mem", &mem_fops, &directly_mappable_cdev_bdi },
 #ifdef CONFIG_DEVKMEM
-	{2, "kmem",    S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops,
-		&directly_mappable_cdev_bdi},
+	[ 2] = { "kmem", &kmem_fops, &directly_mappable_cdev_bdi },
 #endif
-	{3, "null",    S_IRUGO | S_IWUGO,           &null_fops, NULL},
+	[ 3] = {"null", &null_fops, NULL },
 #ifdef CONFIG_DEVPORT
-	{4, "port",    S_IRUSR | S_IWUSR | S_IRGRP, &port_fops, NULL},
+	[ 4] = { "port", &port_fops, NULL },
 #endif
-	{5, "zero",    S_IRUGO | S_IWUGO,           &zero_fops, &zero_bdi},
-	{7, "full",    S_IRUGO | S_IWUGO,           &full_fops, NULL},
-	{8, "random",  S_IRUGO | S_IWUSR,           &random_fops, NULL},
-	{9, "urandom", S_IRUGO | S_IWUSR,           &urandom_fops, NULL},
-	{11,"kmsg",    S_IRUGO | S_IWUSR,           &kmsg_fops, NULL},
+	[ 5] = { "zero", &zero_fops, &zero_bdi },
+	[ 7] = { "full", &full_fops, NULL },
+	[ 8] = { "random", &random_fops, NULL },
+	[ 9] = { "urandom", &urandom_fops, NULL },
+	[11] = { "kmsg", &kmsg_fops, NULL },
 #ifdef CONFIG_CRASH_DUMP
-	{12,"oldmem",    S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops, NULL},
+	[12] = { "oldmem", &oldmem_fops, NULL },
 #endif
 };
 
 static int memory_open(struct inode *inode, struct file *filp)
 {
-	int ret = 0;
-	int i;
+	int minor;
+	const struct memdev *dev;
+	int ret = -ENXIO;
 
 	lock_kernel();
 
-	for (i = 0; i < ARRAY_SIZE(devlist); i++) {
-		if (devlist[i].minor == iminor(inode)) {
-			filp->f_op = devlist[i].fops;
-			if (devlist[i].dev_info) {
-				filp->f_mapping->backing_dev_info =
-					devlist[i].dev_info;
-			}
+	minor = iminor(inode);
+	if (minor >= ARRAY_SIZE(devlist))
+		goto out;
 
-			break;
-		}
-	}
+	dev = &devlist[minor];
+	if (!dev->fops)
+		goto out;
 
-	if (i == ARRAY_SIZE(devlist))
-		ret = -ENXIO;
-	else
-		if (filp->f_op && filp->f_op->open)
-			ret = filp->f_op->open(inode, filp);
+	filp->f_op = dev->fops;
+	if (dev->dev_info)
+		filp->f_mapping->backing_dev_info = dev->dev_info;
 
+	if (dev->fops->open)
+		ret = dev->fops->open(inode, filp);
+	else
+		ret = 0;
+out:
 	unlock_kernel();
 	return ret;
 }
 
 static const struct file_operations memory_fops = {
-	.open		= memory_open,	/* just a selector for the real open */
+	.open		= memory_open,
 };
 
 static struct class *mem_class;
 
 static int __init chr_dev_init(void)
 {
-	int i;
+	int minor;
 	int err;
 
 	err = bdi_init(&zero_bdi);
@@ -939,10 +935,12 @@ static int __init chr_dev_init(void)
 		printk("unable to get major %d for memory devs\n", MEM_MAJOR);
 
 	mem_class = class_create(THIS_MODULE, "mem");
-	for (i = 0; i < ARRAY_SIZE(devlist); i++)
-		device_create(mem_class, NULL,
-			      MKDEV(MEM_MAJOR, devlist[i].minor), NULL,
-			      devlist[i].name);
+	for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
+		if (!devlist[minor].name)
+			continue;
+		device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
+			      NULL, devlist[minor].name);
+	}
 
 	return 0;
 }