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authorLinus Torvalds <torvalds@linux-foundation.org>2014-06-07 19:44:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-07 19:44:40 -0700
commit639b4ac691c6f6e48921dc576379c176f82f3250 (patch)
tree6cf521ae7d46ca8dfa139ca67dd32545de8d2a75 /drivers/char/hw_random/picoxcell-rng.c
parent9d2cd01b15d0782adb81e40094b67904d77b03df (diff)
parent5208ed2ca16526cdbec25abe594a3cc3aea210f4 (diff)
downloadlinux-639b4ac691c6f6e48921dc576379c176f82f3250.tar.bz2
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6 into next
Pull crypto updates from Herbert Xu: "Here is the crypto update for 3.16: - Added test vectors for SHA/AES-CCM/DES-CBC/3DES-CBC. - Fixed a number of error-path memory leaks in tcrypt. - Fixed error-path memory leak in caam. - Removed unnecessary global mutex from mxs-dcp. - Added ahash walk interface that can actually be asynchronous. - Cleaned up caam error reporting. - Allow crypto_user get operation to be used by non-root users. - Add support for SSS module on Exynos. - Misc fixes" * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6: (60 commits) crypto: testmgr - add aead cbc des, des3_ede tests crypto: testmgr - Fix DMA-API warning crypto: cesa - tfm->__crt_alg->cra_type directly crypto: sahara - tfm->__crt_alg->cra_name directly crypto: padlock - tfm->__crt_alg->cra_name directly crypto: n2 - tfm->__crt_alg->cra_name directly crypto: dcp - tfm->__crt_alg->cra_name directly crypto: cesa - tfm->__crt_alg->cra_name directly crypto: ccp - tfm->__crt_alg->cra_name directly crypto: geode - Don't use tfm->__crt_alg->cra_name directly crypto: geode - Weed out printk() from probe() crypto: geode - Consistently use AES_KEYSIZE_128 crypto: geode - Kill AES_IV_LENGTH crypto: geode - Kill AES_MIN_BLOCK_SIZE crypto: mxs-dcp - Remove global mutex crypto: hash - Add real ahash walk interface hwrng: n2-drv - Introduce the use of the managed version of kzalloc crypto: caam - reinitialize keys_fit_inline for decrypt and givencrypt crypto: s5p-sss - fix multiplatform build hwrng: timeriomem - remove unnecessary OOM messages ...
Diffstat (limited to 'drivers/char/hw_random/picoxcell-rng.c')
-rw-r--r--drivers/char/hw_random/picoxcell-rng.c181
1 files changed, 0 insertions, 181 deletions
diff --git a/drivers/char/hw_random/picoxcell-rng.c b/drivers/char/hw_random/picoxcell-rng.c
deleted file mode 100644
index eab5448ad56f..000000000000
--- a/drivers/char/hw_random/picoxcell-rng.c
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
- *
- * 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.
- *
- * All enquiries to support@picochip.com
- */
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/hw_random.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-
-#define DATA_REG_OFFSET 0x0200
-#define CSR_REG_OFFSET 0x0278
-#define CSR_OUT_EMPTY_MASK (1 << 24)
-#define CSR_FAULT_MASK (1 << 1)
-#define TRNG_BLOCK_RESET_MASK (1 << 0)
-#define TAI_REG_OFFSET 0x0380
-
-/*
- * The maximum amount of time in microseconds to spend waiting for data if the
- * core wants us to wait. The TRNG should generate 32 bits every 320ns so a
- * timeout of 20us seems reasonable. The TRNG does builtin tests of the data
- * for randomness so we can't always assume there is data present.
- */
-#define PICO_TRNG_TIMEOUT 20
-
-static void __iomem *rng_base;
-static struct clk *rng_clk;
-static struct device *rng_dev;
-
-static inline u32 picoxcell_trng_read_csr(void)
-{
- return __raw_readl(rng_base + CSR_REG_OFFSET);
-}
-
-static inline bool picoxcell_trng_is_empty(void)
-{
- return picoxcell_trng_read_csr() & CSR_OUT_EMPTY_MASK;
-}
-
-/*
- * Take the random number generator out of reset and make sure the interrupts
- * are masked. We shouldn't need to get large amounts of random bytes so just
- * poll the status register. The hardware generates 32 bits every 320ns so we
- * shouldn't have to wait long enough to warrant waiting for an IRQ.
- */
-static void picoxcell_trng_start(void)
-{
- __raw_writel(0, rng_base + TAI_REG_OFFSET);
- __raw_writel(0, rng_base + CSR_REG_OFFSET);
-}
-
-static void picoxcell_trng_reset(void)
-{
- __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + CSR_REG_OFFSET);
- __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + TAI_REG_OFFSET);
- picoxcell_trng_start();
-}
-
-/*
- * Get some random data from the random number generator. The hw_random core
- * layer provides us with locking.
- */
-static int picoxcell_trng_read(struct hwrng *rng, void *buf, size_t max,
- bool wait)
-{
- int i;
-
- /* Wait for some data to become available. */
- for (i = 0; i < PICO_TRNG_TIMEOUT && picoxcell_trng_is_empty(); ++i) {
- if (!wait)
- return 0;
-
- udelay(1);
- }
-
- if (picoxcell_trng_read_csr() & CSR_FAULT_MASK) {
- dev_err(rng_dev, "fault detected, resetting TRNG\n");
- picoxcell_trng_reset();
- return -EIO;
- }
-
- if (i == PICO_TRNG_TIMEOUT)
- return 0;
-
- *(u32 *)buf = __raw_readl(rng_base + DATA_REG_OFFSET);
- return sizeof(u32);
-}
-
-static struct hwrng picoxcell_trng = {
- .name = "picoxcell",
- .read = picoxcell_trng_read,
-};
-
-static int picoxcell_trng_probe(struct platform_device *pdev)
-{
- int ret;
- struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
- rng_base = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(rng_base))
- return PTR_ERR(rng_base);
-
- rng_clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(rng_clk)) {
- dev_warn(&pdev->dev, "no clk\n");
- return PTR_ERR(rng_clk);
- }
-
- ret = clk_enable(rng_clk);
- if (ret) {
- dev_warn(&pdev->dev, "unable to enable clk\n");
- return ret;
- }
-
- picoxcell_trng_start();
- ret = hwrng_register(&picoxcell_trng);
- if (ret)
- goto err_register;
-
- rng_dev = &pdev->dev;
- dev_info(&pdev->dev, "pixoxcell random number generator active\n");
-
- return 0;
-
-err_register:
- clk_disable(rng_clk);
- return ret;
-}
-
-static int picoxcell_trng_remove(struct platform_device *pdev)
-{
- hwrng_unregister(&picoxcell_trng);
- clk_disable(rng_clk);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int picoxcell_trng_suspend(struct device *dev)
-{
- clk_disable(rng_clk);
-
- return 0;
-}
-
-static int picoxcell_trng_resume(struct device *dev)
-{
- return clk_enable(rng_clk);
-}
-
-static const struct dev_pm_ops picoxcell_trng_pm_ops = {
- .suspend = picoxcell_trng_suspend,
- .resume = picoxcell_trng_resume,
-};
-#endif /* CONFIG_PM */
-
-static struct platform_driver picoxcell_trng_driver = {
- .probe = picoxcell_trng_probe,
- .remove = picoxcell_trng_remove,
- .driver = {
- .name = "picoxcell-trng",
- .owner = THIS_MODULE,
-#ifdef CONFIG_PM
- .pm = &picoxcell_trng_pm_ops,
-#endif /* CONFIG_PM */
- },
-};
-
-module_platform_driver(picoxcell_trng_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jamie Iles");
-MODULE_DESCRIPTION("Picochip picoXcell TRNG driver");