Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753727Ab3IRUII (ORCPT ); Wed, 18 Sep 2013 16:08:08 -0400 Received: from mail-ee0-f50.google.com ([74.125.83.50]:33291 "EHLO mail-ee0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753709Ab3IRUIG (ORCPT ); Wed, 18 Sep 2013 16:08:06 -0400 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= To: Matt Mackall , Herbert Xu , Tony Lindgren , Russell King Cc: linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Pali=20Roh=C3=A1r?= , Juha Yrjola Subject: [PATCH 1/2] hwrng: OMAP3 ROM Random Number Generator support Date: Wed, 18 Sep 2013 22:05:56 +0200 Message-Id: <1379534757-20870-2-git-send-email-pali.rohar@gmail.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1379534757-20870-1-git-send-email-pali.rohar@gmail.com> References: <201303281854.02847@pali> <1379534757-20870-1-git-send-email-pali.rohar@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5850 Lines: 207 This driver provides kernel-side support for the Random Number Generator hardware found on OMAP34xx processors. Signed-off-by: Pali Rohár Signed-off-by: Juha Yrjola --- drivers/char/hw_random/Kconfig | 13 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/omap3-rom-rng.c | 145 ++++++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+) create mode 100644 drivers/char/hw_random/omap3-rom-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 0aa9d91..0a331c3 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 diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index bed467c..7c8aa80 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 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 0000000..a9dbb2d --- /dev/null +++ b/drivers/char/hw_random/omap3-rom-rng.c @@ -0,0 +1,145 @@ +/* + * omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family + * + * Copyright (C) 2009 Nokia Corporation + * Author: Juha Yrjola + * + * Copyright (C) 2013 Pali Rohár + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define RNG_RESET 0x01 +#define RNG_GEN_PRNG_HW_INIT 0x02 +#define RNG_GEN_HW 0x08 + +static const char *omap3_rom_rng_name = "OMAP3 ROM RNG"; + +/* 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) { + printk(KERN_ERR "%s: reset failed: %d\n", + omap3_rom_rng_name, 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); + printk(KERN_ERR "%s: HW init failed: %d\n", + omap3_rom_rng_name, 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) +{ + printk(KERN_INFO "%s: initializing\n", omap3_rom_rng_name); + + omap3_rom_rng_call = pdev->dev.platform_data; + if (!omap3_rom_rng_call) { + printk(KERN_ERR "%s: omap3_rom_rng_call is NULL\n", + omap3_rom_rng_name); + return -EINVAL; + } + + setup_timer(&idle_timer, omap3_rom_rng_idle, 0); + rng_clk = clk_get(&pdev->dev, "ick"); + if (IS_ERR(rng_clk)) { + printk(KERN_ERR "%s: unable to get RNG clock\n", + omap3_rom_rng_name); + return IS_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 "); +MODULE_LICENSE("GPL"); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/