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hwrng: OMAP3 ROM Random Number Generator support
This driver provides kernel-side support for the Random Number Generator hardware found on OMAP34xx processors. This driver comes from Maemo 2.6.28 kernel and was tested on Nokia RX-51. It is platform device because it needs board specific function for smc calls. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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3 changed files with 155 additions and 0 deletions
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@ -165,6 +165,19 @@ config HW_RANDOM_OMAP
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If unsure, say Y.
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If unsure, say Y.
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config HW_RANDOM_OMAP3_ROM
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tristate "OMAP3 ROM Random Number Generator support"
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depends on HW_RANDOM && ARCH_OMAP3
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default HW_RANDOM
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---help---
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This driver provides kernel-side support for the Random Number
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Generator hardware found on OMAP34xx processors.
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To compile this driver as a module, choose M here: the
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module will be called omap3-rom-rng.
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If unsure, say Y.
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config HW_RANDOM_OCTEON
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config HW_RANDOM_OCTEON
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tristate "Octeon Random Number Generator support"
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tristate "Octeon Random Number Generator support"
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depends on HW_RANDOM && CAVIUM_OCTEON_SOC
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depends on HW_RANDOM && CAVIUM_OCTEON_SOC
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@ -15,6 +15,7 @@ n2-rng-y := n2-drv.o n2-asm.o
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obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
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obj-$(CONFIG_HW_RANDOM_VIA) += via-rng.o
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obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
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obj-$(CONFIG_HW_RANDOM_IXP4XX) += ixp4xx-rng.o
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obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
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obj-$(CONFIG_HW_RANDOM_OMAP) += omap-rng.o
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obj-$(CONFIG_HW_RANDOM_OMAP3_ROM) += omap3-rom-rng.o
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obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
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obj-$(CONFIG_HW_RANDOM_PASEMI) += pasemi-rng.o
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obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
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obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o
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obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
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obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
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141
drivers/char/hw_random/omap3-rom-rng.c
Normal file
141
drivers/char/hw_random/omap3-rom-rng.c
Normal file
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@ -0,0 +1,141 @@
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/*
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* omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family
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*
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* Copyright (C) 2009 Nokia Corporation
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* Author: Juha Yrjola <juha.yrjola@solidboot.com>
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*
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* Copyright (C) 2013 Pali Rohár <pali.rohar@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <linux/hw_random.h>
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#include <linux/timer.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#define RNG_RESET 0x01
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#define RNG_GEN_PRNG_HW_INIT 0x02
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#define RNG_GEN_HW 0x08
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/* param1: ptr, param2: count, param3: flag */
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static u32 (*omap3_rom_rng_call)(u32, u32, u32);
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static struct timer_list idle_timer;
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static int rng_idle;
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static struct clk *rng_clk;
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static void omap3_rom_rng_idle(unsigned long data)
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{
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int r;
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r = omap3_rom_rng_call(0, 0, RNG_RESET);
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if (r != 0) {
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pr_err("reset failed: %d\n", r);
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return;
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}
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clk_disable_unprepare(rng_clk);
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rng_idle = 1;
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}
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static int omap3_rom_rng_get_random(void *buf, unsigned int count)
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{
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u32 r;
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u32 ptr;
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del_timer_sync(&idle_timer);
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if (rng_idle) {
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clk_prepare_enable(rng_clk);
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r = omap3_rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
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if (r != 0) {
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clk_disable_unprepare(rng_clk);
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pr_err("HW init failed: %d\n", r);
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return -EIO;
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}
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rng_idle = 0;
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}
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ptr = virt_to_phys(buf);
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r = omap3_rom_rng_call(ptr, count, RNG_GEN_HW);
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mod_timer(&idle_timer, jiffies + msecs_to_jiffies(500));
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if (r != 0)
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return -EINVAL;
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return 0;
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}
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static int omap3_rom_rng_data_present(struct hwrng *rng, int wait)
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{
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return 1;
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}
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static int omap3_rom_rng_data_read(struct hwrng *rng, u32 *data)
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{
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int r;
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r = omap3_rom_rng_get_random(data, 4);
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if (r < 0)
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return r;
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return 4;
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}
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static struct hwrng omap3_rom_rng_ops = {
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.name = "omap3-rom",
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.data_present = omap3_rom_rng_data_present,
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.data_read = omap3_rom_rng_data_read,
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};
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static int omap3_rom_rng_probe(struct platform_device *pdev)
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{
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pr_info("initializing\n");
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omap3_rom_rng_call = pdev->dev.platform_data;
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if (!omap3_rom_rng_call) {
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pr_err("omap3_rom_rng_call is NULL\n");
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return -EINVAL;
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}
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setup_timer(&idle_timer, omap3_rom_rng_idle, 0);
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rng_clk = clk_get(&pdev->dev, "ick");
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if (IS_ERR(rng_clk)) {
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pr_err("unable to get RNG clock\n");
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return PTR_ERR(rng_clk);
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}
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/* Leave the RNG in reset state. */
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clk_prepare_enable(rng_clk);
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omap3_rom_rng_idle(0);
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return hwrng_register(&omap3_rom_rng_ops);
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}
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static int omap3_rom_rng_remove(struct platform_device *pdev)
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{
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hwrng_unregister(&omap3_rom_rng_ops);
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clk_disable_unprepare(rng_clk);
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clk_put(rng_clk);
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return 0;
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}
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static struct platform_driver omap3_rom_rng_driver = {
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.driver = {
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.name = "omap3-rom-rng",
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.owner = THIS_MODULE,
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},
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.probe = omap3_rom_rng_probe,
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.remove = omap3_rom_rng_remove,
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};
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module_platform_driver(omap3_rom_rng_driver);
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MODULE_ALIAS("platform:omap3-rom-rng");
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MODULE_AUTHOR("Juha Yrjola");
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MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
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MODULE_LICENSE("GPL");
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