add support for the hardware random number generator

SVN-Revision: 18004

2 files changed, 353 insertions, 1 deletions

diff --git a/target/linux/octeon/config-default b/target/linux/octeon/config-default
index 6f18b30..90389f8 100644
--- a/target/linux/octeon/config-default
+++ b/target/linux/octeon/config-default
@@ -140,7 +140,8 @@ CONFIG_HAVE_SYSCALL_WRAPPERS=y
 # CONFIG_HECI is not set
 # CONFIG_HIGH_RES_TIMERS is not set
 CONFIG_HW_HAS_PCI=y
-# CONFIG_HW_RANDOM is not set
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_OCTEON=y
 CONFIG_HZ=250
 # CONFIG_HZ_100 is not set
 CONFIG_HZ_250=y
diff --git a/target/linux/octeon/patches/016-octeon_hw_rng.patch b/target/linux/octeon/patches/016-octeon_hw_rng.patch
new file mode 100644
index 0000000..65afe77
--- /dev/null
+++ b/target/linux/octeon/patches/016-octeon_hw_rng.patch
@@ -0,0 +1,351 @@
+From: David Daney <ddaney@caviumnetworks.com>
+Date: Thu, 20 Aug 2009 21:10:22 +0000 (-0700)
+Subject: MIPS: Octeon:  Add hardware RNG platform device.
+X-Git-Tag: linux-2.6.32-rc1~34
+X-Git-Url: http://www.linux-mips.org/git?p=linux.git;a=commitdiff_plain;h=c691b963;hp=a68577bc6ce2b5e422cdb7a993b1c07cc410e02a
+
+MIPS: Octeon:  Add hardware RNG platform device.
+
+Add a platform device for the Octeon Random Number Generator (RNG).
+
+Signed-off-by: David Daney <ddaney@caviumnetworks.com>
+Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+---
+
+Index: linux-2.6.30.8/arch/mips/cavium-octeon/setup.c
+===================================================================
+--- linux-2.6.30.8.orig/arch/mips/cavium-octeon/setup.c	2009-09-24 17:28:02.000000000 +0200
++++ linux-2.6.30.8/arch/mips/cavium-octeon/setup.c	2009-10-08 13:10:09.000000000 +0200
+@@ -32,6 +32,7 @@
+ #include <asm/time.h>
+ 
+ #include <asm/octeon/octeon.h>
++#include <asm/octeon/cvmx-rnm-defs.h>
+ 
+ #ifdef CONFIG_CAVIUM_DECODE_RSL
+ extern void cvmx_interrupt_rsl_decode(void);
+@@ -925,3 +926,45 @@
+ 	return ret;
+ }
+ device_initcall(octeon_cf_device_init);
++
++/* Octeon Random Number Generator.  */
++static int __init octeon_rng_device_init(void)
++{
++	struct platform_device *pd;
++	int ret = 0;
++
++	struct resource rng_resources[] = {
++		{
++			.flags	= IORESOURCE_MEM,
++			.start	= XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS),
++			.end	= XKPHYS_TO_PHYS(CVMX_RNM_CTL_STATUS) + 0xf
++		}, {
++			.flags	= IORESOURCE_MEM,
++			.start	= cvmx_build_io_address(8, 0),
++			.end	= cvmx_build_io_address(8, 0) + 0x7
++		}
++	};
++
++	pd = platform_device_alloc("octeon_rng", -1);
++	if (!pd) {
++		ret = -ENOMEM;
++		goto out;
++	}
++
++	ret = platform_device_add_resources(pd, rng_resources,
++					    ARRAY_SIZE(rng_resources));
++	if (ret)
++		goto fail;
++
++	ret = platform_device_add(pd);
++	if (ret)
++		goto fail;
++
++	return ret;
++fail:
++	platform_device_put(pd);
++
++out:
++	return ret;
++}
++device_initcall(octeon_rng_device_init);
+Index: linux-2.6.30.8/arch/mips/include/asm/octeon/cvmx-rnm-defs.h
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.8/arch/mips/include/asm/octeon/cvmx-rnm-defs.h	2009-10-08 13:10:09.000000000 +0200
+@@ -0,0 +1,88 @@
++/***********************license start***************
++ * Author: Cavium Networks
++ *
++ * Contact: support@caviumnetworks.com
++ * This file is part of the OCTEON SDK
++ *
++ * Copyright (c) 2003-2008 Cavium Networks
++ *
++ * This file is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License, Version 2, as
++ * published by the Free Software Foundation.
++ *
++ * This file is distributed in the hope that it will be useful, but
++ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
++ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
++ * NONINFRINGEMENT.  See the GNU General Public License for more
++ * details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this file; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
++ * or visit http://www.gnu.org/licenses/.
++ *
++ * This file may also be available under a different license from Cavium.
++ * Contact Cavium Networks for more information
++ ***********************license end**************************************/
++
++#ifndef __CVMX_RNM_DEFS_H__
++#define __CVMX_RNM_DEFS_H__
++
++#include <linux/types.h>
++
++#define CVMX_RNM_BIST_STATUS \
++	 CVMX_ADD_IO_SEG(0x0001180040000008ull)
++#define CVMX_RNM_CTL_STATUS \
++	 CVMX_ADD_IO_SEG(0x0001180040000000ull)
++
++union cvmx_rnm_bist_status {
++	uint64_t u64;
++	struct cvmx_rnm_bist_status_s {
++		uint64_t reserved_2_63:62;
++		uint64_t rrc:1;
++		uint64_t mem:1;
++	} s;
++	struct cvmx_rnm_bist_status_s cn30xx;
++	struct cvmx_rnm_bist_status_s cn31xx;
++	struct cvmx_rnm_bist_status_s cn38xx;
++	struct cvmx_rnm_bist_status_s cn38xxp2;
++	struct cvmx_rnm_bist_status_s cn50xx;
++	struct cvmx_rnm_bist_status_s cn52xx;
++	struct cvmx_rnm_bist_status_s cn52xxp1;
++	struct cvmx_rnm_bist_status_s cn56xx;
++	struct cvmx_rnm_bist_status_s cn56xxp1;
++	struct cvmx_rnm_bist_status_s cn58xx;
++	struct cvmx_rnm_bist_status_s cn58xxp1;
++};
++
++union cvmx_rnm_ctl_status {
++	uint64_t u64;
++	struct cvmx_rnm_ctl_status_s {
++		uint64_t reserved_9_63:55;
++		uint64_t ent_sel:4;
++		uint64_t exp_ent:1;
++		uint64_t rng_rst:1;
++		uint64_t rnm_rst:1;
++		uint64_t rng_en:1;
++		uint64_t ent_en:1;
++	} s;
++	struct cvmx_rnm_ctl_status_cn30xx {
++		uint64_t reserved_4_63:60;
++		uint64_t rng_rst:1;
++		uint64_t rnm_rst:1;
++		uint64_t rng_en:1;
++		uint64_t ent_en:1;
++	} cn30xx;
++	struct cvmx_rnm_ctl_status_cn30xx cn31xx;
++	struct cvmx_rnm_ctl_status_cn30xx cn38xx;
++	struct cvmx_rnm_ctl_status_cn30xx cn38xxp2;
++	struct cvmx_rnm_ctl_status_s cn50xx;
++	struct cvmx_rnm_ctl_status_s cn52xx;
++	struct cvmx_rnm_ctl_status_s cn52xxp1;
++	struct cvmx_rnm_ctl_status_s cn56xx;
++	struct cvmx_rnm_ctl_status_s cn56xxp1;
++	struct cvmx_rnm_ctl_status_s cn58xx;
++	struct cvmx_rnm_ctl_status_s cn58xxp1;
++};
++
++#endif
+Index: linux-2.6.30.8/drivers/char/hw_random/Kconfig
+===================================================================
+--- linux-2.6.30.8.orig/drivers/char/hw_random/Kconfig	2009-09-24 17:28:02.000000000 +0200
++++ linux-2.6.30.8/drivers/char/hw_random/Kconfig	2009-10-08 13:10:09.000000000 +0200
+@@ -126,6 +126,19 @@
+ 
+  	  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
+Index: linux-2.6.30.8/drivers/char/hw_random/Makefile
+===================================================================
+--- linux-2.6.30.8.orig/drivers/char/hw_random/Makefile	2009-09-24 17:28:02.000000000 +0200
++++ linux-2.6.30.8/drivers/char/hw_random/Makefile	2009-10-08 13:10:23.000000000 +0200
+@@ -15,3 +15,4 @@
+ obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
+ obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
+ obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
++obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
+Index: linux-2.6.30.8/drivers/char/hw_random/octeon-rng.c
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.8/drivers/char/hw_random/octeon-rng.c	2009-10-08 13:10:09.000000000 +0200
+@@ -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");