From patchwork Thu Apr 12 15:08:53 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kent Yoder X-Patchwork-Id: 152091 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [IPv6:::1]) by ozlabs.org (Postfix) with ESMTP id AED7EB776B for ; Fri, 13 Apr 2012 01:16:56 +1000 (EST) Received: from e6.ny.us.ibm.com (e6.ny.us.ibm.com [32.97.182.146]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e6.ny.us.ibm.com", Issuer "Equifax" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 92918B6FC3 for ; Fri, 13 Apr 2012 01:16:07 +1000 (EST) Received: from /spool/local by e6.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 12 Apr 2012 11:08:08 -0400 Received: from d01relay05.pok.ibm.com (d01relay05.pok.ibm.com [9.56.227.237]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id CF9606E80DC for ; Thu, 12 Apr 2012 11:07:48 -0400 (EDT) Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay05.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q3CF7lgM155812 for ; Thu, 12 Apr 2012 11:07:48 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q3CF7kjk026520 for ; Thu, 12 Apr 2012 12:07:47 -0300 Received: from [9.53.41.73] (ennui.austin.ibm.com [9.53.41.73]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id q3CF7kfH026425; Thu, 12 Apr 2012 12:07:46 -0300 Message-ID: <1334243333.18090.12.camel@key-ThinkPad-W510> Subject: [PATCH v3 04/17] hwrng: pseries - PFO-based hwrng driver From: Kent Yoder To: linux-kernel@vger.kernel.org Date: Thu, 12 Apr 2012 10:08:53 -0500 In-Reply-To: <1334242825.18090.4.camel@key-ThinkPad-W510> References: <1334242825.18090.4.camel@key-ThinkPad-W510> X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12041215-1976-0000-0000-00000C45D743 Cc: key@linux.vnet.ibm.com, rcj@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Adds support for the Platform Facilities Option (PFO)-based hardware random number generator for POWER hardware. Signed-off-by: Michael Neuling Signed-off-by: Robert Jennings Signed-off-by: Kent Yoder --- drivers/char/hw_random/Kconfig | 13 +++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/pseries-rng.c | 96 ++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+), 0 deletions(-) create mode 100644 drivers/char/hw_random/pseries-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 0689bf6..9355347 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -250,3 +250,16 @@ config UML_RANDOM (check your distro, or download from http://sourceforge.net/projects/gkernel/). rngd periodically reads /dev/hwrng and injects the entropy into /dev/random. + +config HW_RANDOM_PSERIES + tristate "pSeries HW Random Number Generator support" + depends on HW_RANDOM && PPC64 && IBMVIO + default HW_RANDOM + ---help--- + This driver provides kernel-side support for the Random Number + Generator hardware found on POWER7+ machines and above + + To compile this driver as a module, choose M here: the + module will be called pseries-rng. + + If unsure, say Y. diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index b2ff526..d901dfa 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o obj-$(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 diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c new file mode 100644 index 0000000..5f11979 --- /dev/null +++ b/drivers/char/hw_random/pseries-rng.c @@ -0,0 +1,96 @@ +/* + * Copyright (C) 2010 Michael Neuling IBM Corporation + * + * Driver for the pseries hardware RNG for POWER7+ and above + * + * This program 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 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 +#include +#include + +#define MODULE_NAME "pseries-rng" + +static int pseries_rng_data_read(struct hwrng *rng, u32 *data) +{ + if (plpar_hcall(H_RANDOM, (unsigned long *)data) != H_SUCCESS) { + printk(KERN_ERR "pseries rng hcall error\n"); + return 0; + } + return 8; +} + +/** + * pseries_rng_get_desired_dma - Return desired DMA allocate for CMO operations + * + * This is a required function for a driver to operate in a CMO environment + * but this device does not make use of DMA allocations, return 0. + * + * Return value: + * Number of bytes of IO data the driver will need to perform well -> 0 + */ +static unsigned long pseries_rng_get_desired_dma(struct vio_dev *vdev) +{ + return 0; +}; + +static struct hwrng pseries_rng = { + .name = MODULE_NAME, + .data_read = pseries_rng_data_read, +}; + +static int __init 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) +{ + hwrng_unregister(&pseries_rng); + return 0; +} + +static struct vio_device_id pseries_rng_driver_ids[] = { + { "ibm,random-v1", "ibm,random"}, + { "", "" } +}; +MODULE_DEVICE_TABLE(vio, pseries_rng_driver_ids); + +static struct vio_driver pseries_rng_driver = { + .name = MODULE_NAME, + .probe = pseries_rng_probe, + .remove = pseries_rng_remove, + .get_desired_dma = pseries_rng_get_desired_dma, + .id_table = pseries_rng_driver_ids +}; + +static int __init rng_init(void) +{ + printk(KERN_INFO "Registering IBM pSeries RNG driver\n"); + return vio_register_driver(&pseries_rng_driver); +} + +module_init(rng_init); + +static void __exit rng_exit(void) +{ + vio_unregister_driver(&pseries_rng_driver); +} +module_exit(rng_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Neuling "); +MODULE_DESCRIPTION("H/W RNG driver for IBM pSeries processors");