forked from Minki/linux
59ecc26004
Pull crypto updates from Herbert Xu:
"Here is the crypto update for 3.15:
- Added 3DES driver for OMAP4/AM43xx
- Added AVX2 acceleration for SHA
- Added hash-only AEAD algorithms in caam
- Removed tegra driver as it is not functioning and the hardware is
too slow
- Allow blkcipher walks over AEAD (needed for ARM)
- Fixed unprotected FPU/SSE access in ghash-clmulni-intel
- Fixed highmem crash in omap-sham
- Add (zero entropy) randomness when initialising hardware RNGs
- Fixed unaligned ahash comletion functions
- Added soft module depedency for crc32c for initrds that use crc32c"
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (60 commits)
crypto: ghash-clmulni-intel - use C implementation for setkey()
crypto: x86/sha1 - reduce size of the AVX2 asm implementation
crypto: x86/sha1 - fix stack alignment of AVX2 variant
crypto: x86/sha1 - re-enable the AVX variant
crypto: sha - SHA1 transform x86_64 AVX2
crypto: crypto_wq - Fix late crypto work queue initialization
crypto: caam - add missing key_dma unmap
crypto: caam - add support for aead null encryption
crypto: testmgr - add aead null encryption test vectors
crypto: export NULL algorithms defines
crypto: caam - remove error propagation handling
crypto: hash - Simplify the ahash_finup implementation
crypto: hash - Pull out the functions to save/restore request
crypto: hash - Fix the pointer voodoo in unaligned ahash
crypto: caam - Fix first parameter to caam_init_rng
crypto: omap-sham - Map SG pages if they are HIGHMEM before accessing
crypto: caam - Dynamic memory allocation for caam_rng_ctx object
crypto: allow blkcipher walks over AEAD data
crypto: remove direct blkcipher_walk dependency on transform
hwrng: add randomness to system from rng sources
...
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/*
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* Nomadik RNG support
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* Copyright 2009 Alessandro Rubini
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/hw_random.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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static struct clk *rng_clk;
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static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
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{
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void __iomem *base = (void __iomem *)rng->priv;
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/*
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* The register is 32 bits and gives 16 random bits (low half).
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* A subsequent read will delay the core for 400ns, so we just read
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* once and accept the very unlikely very small delay, even if wait==0.
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*/
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*(u16 *)data = __raw_readl(base + 8) & 0xffff;
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return 2;
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}
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/* we have at most one RNG per machine, granted */
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static struct hwrng nmk_rng = {
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.name = "nomadik",
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.read = nmk_rng_read,
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};
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static int nmk_rng_probe(struct amba_device *dev, const struct amba_id *id)
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{
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void __iomem *base;
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int ret;
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rng_clk = devm_clk_get(&dev->dev, NULL);
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if (IS_ERR(rng_clk)) {
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dev_err(&dev->dev, "could not get rng clock\n");
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ret = PTR_ERR(rng_clk);
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return ret;
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}
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clk_prepare_enable(rng_clk);
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ret = amba_request_regions(dev, dev->dev.init_name);
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if (ret)
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goto out_clk;
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ret = -ENOMEM;
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base = devm_ioremap(&dev->dev, dev->res.start,
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resource_size(&dev->res));
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if (!base)
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goto out_release;
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nmk_rng.priv = (unsigned long)base;
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ret = hwrng_register(&nmk_rng);
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if (ret)
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goto out_release;
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return 0;
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out_release:
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amba_release_regions(dev);
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out_clk:
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clk_disable(rng_clk);
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return ret;
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}
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static int nmk_rng_remove(struct amba_device *dev)
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{
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hwrng_unregister(&nmk_rng);
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amba_release_regions(dev);
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clk_disable(rng_clk);
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return 0;
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}
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static struct amba_id nmk_rng_ids[] = {
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{
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.id = 0x000805e1,
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.mask = 0x000fffff, /* top bits are rev and cfg: accept all */
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},
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{0, 0},
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};
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MODULE_DEVICE_TABLE(amba, nmk_rng_ids);
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static struct amba_driver nmk_rng_driver = {
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.drv = {
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.owner = THIS_MODULE,
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.name = "rng",
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},
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.probe = nmk_rng_probe,
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.remove = nmk_rng_remove,
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.id_table = nmk_rng_ids,
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};
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module_amba_driver(nmk_rng_driver);
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MODULE_LICENSE("GPL");
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