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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-27 00:00:59 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-27 00:00:59 +0400
commit44a6b8442190cf213081060b610dae2e822f802b (patch)
tree2280bfe385bef8b6416a6493ea8988a975008165 /drivers/char/hw_random
parent945c40c6b007eb4b07374a38ea37b2a34da306b1 (diff)
parenta43478863b16cb0986fd2ec9d1f1b9ebaaec5922 (diff)
downloadlinux-44a6b8442190cf213081060b610dae2e822f802b.tar.xz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu: - Fixed algorithm construction hang when self-test fails. - Added SHA variants to talitos AEAD list. - New driver for Exynos random number generator. - Performance enhancements for arc4. - Added hwrng support to caam. - Added ahash support to caam. - Fixed bad kfree in aesni-intel. - Allow aesni-intel in FIPS mode. - Added atmel driver with support for AES/3DES/SHA. - Bug fixes for mv_cesa. - CRC hardware driver for BF60x family processors. * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (66 commits) crypto: twofish-avx - remove useless instruction crypto: testmgr - add aead cbc aes hmac sha1,256,512 test vectors crypto: talitos - add sha224, sha384 and sha512 to existing AEAD algorithms crypto: talitos - export the talitos_submit function crypto: talitos - move talitos structures to header file crypto: atmel - add new tests to tcrypt crypto: atmel - add Atmel SHA1/SHA256 driver crypto: atmel - add Atmel DES/TDES driver crypto: atmel - add Atmel AES driver ARM: AT91SAM9G45: add crypto peripherals crypto: testmgr - allow aesni-intel and ghash_clmulni-intel in fips mode hwrng: exynos - Add support for Exynos random number generator crypto: aesni-intel - fix wrong kfree pointer crypto: caam - ERA retrieval and printing for SEC device crypto: caam - Using alloc_coherent for caam job rings crypto: algapi - Fix hang on crypto allocation crypto: arc4 - now arc needs blockcipher support crypto: caam - one tasklet per job ring crypto: caam - consolidate memory barriers from job ring en/dequeue crypto: caam - only query h/w in job ring dequeue path ...
Diffstat (limited to 'drivers/char/hw_random')
-rw-r--r--drivers/char/hw_random/Kconfig12
-rw-r--r--drivers/char/hw_random/Makefile1
-rw-r--r--drivers/char/hw_random/exynos-rng.c182
-rw-r--r--drivers/char/hw_random/mxc-rnga.c21
4 files changed, 208 insertions, 8 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index f45dad39a18b..b01d67328243 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -263,3 +263,15 @@ config HW_RANDOM_PSERIES
module will be called pseries-rng.
If unsure, say Y.
+
+config HW_RANDOM_EXYNOS
+ tristate "EXYNOS HW random number generator support"
+ depends on HW_RANDOM && HAS_IOMEM && HAVE_CLK
+ ---help---
+ This driver provides kernel-side support for the Random Number
+ Generator hardware found on EXYNOS SOCs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called exynos-rng.
+
+ If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index d901dfa30321..8d6d173b65e6 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -23,3 +23,4 @@ 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
+obj-$(CONFIG_HW_RANDOM_EXYNOS) += exynos-rng.o
diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
new file mode 100644
index 000000000000..232ba9ce579c
--- /dev/null
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -0,0 +1,182 @@
+/*
+ * exynos-rng.c - Random Number Generator driver for the exynos
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Jonghwa Lee <jonghwa3.lee@smasung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 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 <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+#include <linux/err.h>
+
+#define EXYNOS_PRNG_STATUS_OFFSET 0x10
+#define EXYNOS_PRNG_SEED_OFFSET 0x140
+#define EXYNOS_PRNG_OUT1_OFFSET 0x160
+#define SEED_SETTING_DONE BIT(1)
+#define PRNG_START 0x18
+#define PRNG_DONE BIT(5)
+#define EXYNOS_AUTOSUSPEND_DELAY 100
+
+struct exynos_rng {
+ struct device *dev;
+ struct hwrng rng;
+ void __iomem *mem;
+ struct clk *clk;
+};
+
+static u32 exynos_rng_readl(struct exynos_rng *rng, u32 offset)
+{
+ return __raw_readl(rng->mem + offset);
+}
+
+static void exynos_rng_writel(struct exynos_rng *rng, u32 val, u32 offset)
+{
+ __raw_writel(val, rng->mem + offset);
+}
+
+static int exynos_init(struct hwrng *rng)
+{
+ struct exynos_rng *exynos_rng = container_of(rng,
+ struct exynos_rng, rng);
+ int i;
+ int ret = 0;
+
+ pm_runtime_get_sync(exynos_rng->dev);
+
+ for (i = 0 ; i < 5 ; i++)
+ exynos_rng_writel(exynos_rng, jiffies,
+ EXYNOS_PRNG_SEED_OFFSET + 4*i);
+
+ if (!(exynos_rng_readl(exynos_rng, EXYNOS_PRNG_STATUS_OFFSET)
+ & SEED_SETTING_DONE))
+ ret = -EIO;
+
+ pm_runtime_put_noidle(exynos_rng->dev);
+
+ return ret;
+}
+
+static int exynos_read(struct hwrng *rng, void *buf,
+ size_t max, bool wait)
+{
+ struct exynos_rng *exynos_rng = container_of(rng,
+ struct exynos_rng, rng);
+ u32 *data = buf;
+
+ pm_runtime_get_sync(exynos_rng->dev);
+
+ exynos_rng_writel(exynos_rng, PRNG_START, 0);
+
+ while (!(exynos_rng_readl(exynos_rng,
+ EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE))
+ cpu_relax();
+
+ exynos_rng_writel(exynos_rng, PRNG_DONE, EXYNOS_PRNG_STATUS_OFFSET);
+
+ *data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET);
+
+ pm_runtime_mark_last_busy(exynos_rng->dev);
+ pm_runtime_autosuspend(exynos_rng->dev);
+
+ return 4;
+}
+
+static int __devinit exynos_rng_probe(struct platform_device *pdev)
+{
+ struct exynos_rng *exynos_rng;
+
+ exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
+ GFP_KERNEL);
+ if (!exynos_rng)
+ return -ENOMEM;
+
+ exynos_rng->dev = &pdev->dev;
+ exynos_rng->rng.name = "exynos";
+ exynos_rng->rng.init = exynos_init;
+ exynos_rng->rng.read = exynos_read;
+ exynos_rng->clk = devm_clk_get(&pdev->dev, "secss");
+ if (IS_ERR(exynos_rng->clk)) {
+ dev_err(&pdev->dev, "Couldn't get clock.\n");
+ return -ENOENT;
+ }
+
+ exynos_rng->mem = devm_request_and_ioremap(&pdev->dev,
+ platform_get_resource(pdev, IORESOURCE_MEM, 0));
+ if (!exynos_rng->mem)
+ return -EBUSY;
+
+ platform_set_drvdata(pdev, exynos_rng);
+
+ pm_runtime_set_autosuspend_delay(&pdev->dev, EXYNOS_AUTOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ return hwrng_register(&exynos_rng->rng);
+}
+
+static int __devexit exynos_rng_remove(struct platform_device *pdev)
+{
+ struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+ hwrng_unregister(&exynos_rng->rng);
+
+ return 0;
+}
+
+static int exynos_rng_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(exynos_rng->clk);
+
+ return 0;
+}
+
+static int exynos_rng_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct exynos_rng *exynos_rng = platform_get_drvdata(pdev);
+
+ return clk_prepare_enable(exynos_rng->clk);
+}
+
+
+UNIVERSAL_DEV_PM_OPS(exynos_rng_pm_ops, exynos_rng_runtime_suspend,
+ exynos_rng_runtime_resume, NULL);
+
+static struct platform_driver exynos_rng_driver = {
+ .driver = {
+ .name = "exynos-rng",
+ .owner = THIS_MODULE,
+ .pm = &exynos_rng_pm_ops,
+ },
+ .probe = exynos_rng_probe,
+ .remove = __devexit_p(exynos_rng_remove),
+};
+
+module_platform_driver(exynos_rng_driver);
+
+MODULE_DESCRIPTION("EXYNOS 4 H/W Random Number Generator driver");
+MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index 187c6be80f43..85074de5042e 100644
--- a/drivers/char/hw_random/mxc-rnga.c
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -24,6 +24,7 @@
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/hw_random.h>
+#include <linux/delay.h>
#include <linux/io.h>
/* RNGA Registers */
@@ -60,16 +61,20 @@
static struct platform_device *rng_dev;
-static int mxc_rnga_data_present(struct hwrng *rng)
+static int mxc_rnga_data_present(struct hwrng *rng, int wait)
{
- int level;
void __iomem *rng_base = (void __iomem *)rng->priv;
-
- /* how many random numbers is in FIFO? [0-16] */
- level = ((__raw_readl(rng_base + RNGA_STATUS) &
- RNGA_STATUS_LEVEL_MASK) >> 8);
-
- return level > 0 ? 1 : 0;
+ int i;
+
+ for (i = 0; i < 20; i++) {
+ /* how many random numbers are in FIFO? [0-16] */
+ int level = (__raw_readl(rng_base + RNGA_STATUS) &
+ RNGA_STATUS_LEVEL_MASK) >> 8;
+ if (level || !wait)
+ return !!level;
+ udelay(10);
+ }
+ return 0;
}
static int mxc_rnga_data_read(struct hwrng *rng, u32 * data)