diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-02 14:53:12 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-02 14:53:12 -0700 |
commit | 797994f81a8b2bdca2eecffa415c1e7a89a4f961 (patch) | |
tree | 1383dc469c26ad37fdf960f682d9a48c782935c5 /drivers/char/hw_random/bcm2835-rng.c | |
parent | c8d8566952fda026966784a62f324c8352f77430 (diff) | |
parent | 3862de1f6c442d53bd828d39f86d07d933a70605 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto update from Herbert Xu:
- XTS mode optimisation for twofish/cast6/camellia/aes on x86
- AVX2/x86_64 implementation for blowfish/twofish/serpent/camellia
- SSSE3/AVX/AVX2 optimisations for sha256/sha512
- Added driver for SAHARA2 crypto accelerator
- Fix for GMAC when used in non-IPsec secnarios
- Added generic CMAC implementation (including IPsec glue)
- IP update for crypto/atmel
- Support for more than one device in hwrng/timeriomem
- Added Broadcom BCM2835 RNG driver
- Misc fixes
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (59 commits)
crypto: caam - fix job ring cleanup code
crypto: camellia - add AVX2/AES-NI/x86_64 assembler implementation of camellia cipher
crypto: serpent - add AVX2/x86_64 assembler implementation of serpent cipher
crypto: twofish - add AVX2/x86_64 assembler implementation of twofish cipher
crypto: blowfish - add AVX2/x86_64 implementation of blowfish cipher
crypto: tcrypt - add async cipher speed tests for blowfish
crypto: testmgr - extend camellia test-vectors for camellia-aesni/avx2
crypto: aesni_intel - fix Kconfig problem with CRYPTO_GLUE_HELPER_X86
crypto: aesni_intel - add more optimized XTS mode for x86-64
crypto: x86/camellia-aesni-avx - add more optimized XTS code
crypto: cast6-avx: use new optimized XTS code
crypto: x86/twofish-avx - use optimized XTS code
crypto: x86 - add more optimized XTS-mode for serpent-avx
xfrm: add rfc4494 AES-CMAC-96 support
crypto: add CMAC support to CryptoAPI
crypto: testmgr - add empty test vectors for null ciphers
crypto: testmgr - add AES GMAC test vectors
crypto: gcm - fix rfc4543 to handle async crypto correctly
crypto: gcm - make GMAC work when dst and src are different
hwrng: timeriomem - added devicetree hooks
...
Diffstat (limited to 'drivers/char/hw_random/bcm2835-rng.c')
-rw-r--r-- | drivers/char/hw_random/bcm2835-rng.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c new file mode 100644 index 00000000000..eb7f14725eb --- /dev/null +++ b/drivers/char/hw_random/bcm2835-rng.c @@ -0,0 +1,113 @@ +/** + * Copyright (c) 2010-2012 Broadcom. All rights reserved. + * Copyright (c) 2013 Lubomir Rintel + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License ("GPL") + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/hw_random.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/printk.h> + +#define RNG_CTRL 0x0 +#define RNG_STATUS 0x4 +#define RNG_DATA 0x8 + +/* enable rng */ +#define RNG_RBGEN 0x1 + +/* the initial numbers generated are "less random" so will be discarded */ +#define RNG_WARMUP_COUNT 0x40000 + +static int bcm2835_rng_read(struct hwrng *rng, void *buf, size_t max, + bool wait) +{ + void __iomem *rng_base = (void __iomem *)rng->priv; + + while ((__raw_readl(rng_base + RNG_STATUS) >> 24) == 0) { + if (!wait) + return 0; + cpu_relax(); + } + + *(u32 *)buf = __raw_readl(rng_base + RNG_DATA); + return sizeof(u32); +} + +static struct hwrng bcm2835_rng_ops = { + .name = "bcm2835", + .read = bcm2835_rng_read, +}; + +static int bcm2835_rng_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + void __iomem *rng_base; + int err; + + /* map peripheral */ + rng_base = of_iomap(np, 0); + if (!rng_base) { + dev_err(dev, "failed to remap rng regs"); + return -ENODEV; + } + bcm2835_rng_ops.priv = (unsigned long)rng_base; + + /* register driver */ + err = hwrng_register(&bcm2835_rng_ops); + if (err) { + dev_err(dev, "hwrng registration failed\n"); + iounmap(rng_base); + } else { + dev_info(dev, "hwrng registered\n"); + + /* set warm-up count & enable */ + __raw_writel(RNG_WARMUP_COUNT, rng_base + RNG_STATUS); + __raw_writel(RNG_RBGEN, rng_base + RNG_CTRL); + } + return err; +} + +static int bcm2835_rng_remove(struct platform_device *pdev) +{ + void __iomem *rng_base = (void __iomem *)bcm2835_rng_ops.priv; + + /* disable rng hardware */ + __raw_writel(0, rng_base + RNG_CTRL); + + /* unregister driver */ + hwrng_unregister(&bcm2835_rng_ops); + iounmap(rng_base); + + return 0; +} + +static const struct of_device_id bcm2835_rng_of_match[] = { + { .compatible = "brcm,bcm2835-rng", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match); + +static struct platform_driver bcm2835_rng_driver = { + .driver = { + .name = "bcm2835-rng", + .owner = THIS_MODULE, + .of_match_table = bcm2835_rng_of_match, + }, + .probe = bcm2835_rng_probe, + .remove = bcm2835_rng_remove, +}; +module_platform_driver(bcm2835_rng_driver); + +MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>"); +MODULE_DESCRIPTION("BCM2835 Random Number Generator (RNG) driver"); +MODULE_LICENSE("GPLv2"); |