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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Kent Yoder <key@linux.vnet.ibm.com> Cc: Jamie Iles <jamie@jamieiles.com> Cc: Kim Phillips <kim.phillips@freescale.com> Cc: Shengzhou Liu <Shengzhou.Liu@freescale.com> Cc: Alex Porosanu <alexandru.porosanu@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1107 lines
26 KiB
C
1107 lines
26 KiB
C
/*
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* Cryptographic API.
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*
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* Support for ATMEL SHA1/SHA256 HW acceleration.
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*
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* Copyright (c) 2012 Eukréa Electromatique - ATMEL
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* Author: Nicolas Royer <nicolas@eukrea.com>
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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 version 2 as published
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* by the Free Software Foundation.
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*
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* Some ideas are from omap-sham.c drivers.
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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/slab.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/hw_random.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/crypto.h>
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#include <linux/cryptohash.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/algapi.h>
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#include <crypto/sha.h>
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#include <crypto/hash.h>
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#include <crypto/internal/hash.h>
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#include "atmel-sha-regs.h"
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/* SHA flags */
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#define SHA_FLAGS_BUSY BIT(0)
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#define SHA_FLAGS_FINAL BIT(1)
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#define SHA_FLAGS_DMA_ACTIVE BIT(2)
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#define SHA_FLAGS_OUTPUT_READY BIT(3)
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#define SHA_FLAGS_INIT BIT(4)
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#define SHA_FLAGS_CPU BIT(5)
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#define SHA_FLAGS_DMA_READY BIT(6)
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#define SHA_FLAGS_FINUP BIT(16)
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#define SHA_FLAGS_SG BIT(17)
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#define SHA_FLAGS_SHA1 BIT(18)
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#define SHA_FLAGS_SHA256 BIT(19)
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#define SHA_FLAGS_ERROR BIT(20)
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#define SHA_FLAGS_PAD BIT(21)
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#define SHA_FLAGS_DUALBUFF BIT(24)
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#define SHA_OP_UPDATE 1
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#define SHA_OP_FINAL 2
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#define SHA_BUFFER_LEN PAGE_SIZE
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#define ATMEL_SHA_DMA_THRESHOLD 56
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struct atmel_sha_dev;
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struct atmel_sha_reqctx {
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struct atmel_sha_dev *dd;
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unsigned long flags;
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unsigned long op;
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u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
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size_t digcnt;
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size_t bufcnt;
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size_t buflen;
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dma_addr_t dma_addr;
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/* walk state */
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struct scatterlist *sg;
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unsigned int offset; /* offset in current sg */
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unsigned int total; /* total request */
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u8 buffer[0] __aligned(sizeof(u32));
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};
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struct atmel_sha_ctx {
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struct atmel_sha_dev *dd;
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unsigned long flags;
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/* fallback stuff */
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struct crypto_shash *fallback;
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};
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#define ATMEL_SHA_QUEUE_LENGTH 1
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struct atmel_sha_dev {
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struct list_head list;
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unsigned long phys_base;
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struct device *dev;
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struct clk *iclk;
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int irq;
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void __iomem *io_base;
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spinlock_t lock;
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int err;
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struct tasklet_struct done_task;
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unsigned long flags;
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struct crypto_queue queue;
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struct ahash_request *req;
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};
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struct atmel_sha_drv {
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struct list_head dev_list;
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spinlock_t lock;
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};
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static struct atmel_sha_drv atmel_sha = {
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.dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
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.lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
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};
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static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
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{
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return readl_relaxed(dd->io_base + offset);
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}
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static inline void atmel_sha_write(struct atmel_sha_dev *dd,
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u32 offset, u32 value)
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{
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writel_relaxed(value, dd->io_base + offset);
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}
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static void atmel_sha_dualbuff_test(struct atmel_sha_dev *dd)
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{
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atmel_sha_write(dd, SHA_MR, SHA_MR_DUALBUFF);
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if (atmel_sha_read(dd, SHA_MR) & SHA_MR_DUALBUFF)
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dd->flags |= SHA_FLAGS_DUALBUFF;
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}
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static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
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{
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size_t count;
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while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
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count = min(ctx->sg->length - ctx->offset, ctx->total);
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count = min(count, ctx->buflen - ctx->bufcnt);
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if (count <= 0)
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break;
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scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
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ctx->offset, count, 0);
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ctx->bufcnt += count;
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ctx->offset += count;
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ctx->total -= count;
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if (ctx->offset == ctx->sg->length) {
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ctx->sg = sg_next(ctx->sg);
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if (ctx->sg)
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ctx->offset = 0;
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else
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ctx->total = 0;
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}
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}
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return 0;
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}
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/*
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* The purpose of this padding is to ensure that the padded message
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* is a multiple of 512 bits. The bit "1" is appended at the end of
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* the message followed by "padlen-1" zero bits. Then a 64 bits block
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* equals to the message length in bits is appended.
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*
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* padlen is calculated as followed:
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* - if message length < 56 bytes then padlen = 56 - message length
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* - else padlen = 64 + 56 - message length
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*/
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static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
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{
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unsigned int index, padlen;
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u64 bits;
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u64 size;
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bits = (ctx->bufcnt + ctx->digcnt + length) << 3;
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size = cpu_to_be64(bits);
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index = ctx->bufcnt & 0x3f;
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padlen = (index < 56) ? (56 - index) : ((64+56) - index);
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*(ctx->buffer + ctx->bufcnt) = 0x80;
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memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
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memcpy(ctx->buffer + ctx->bufcnt + padlen, &size, 8);
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ctx->bufcnt += padlen + 8;
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ctx->flags |= SHA_FLAGS_PAD;
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}
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static int atmel_sha_init(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
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struct atmel_sha_dev *dd = NULL;
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struct atmel_sha_dev *tmp;
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spin_lock_bh(&atmel_sha.lock);
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if (!tctx->dd) {
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list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
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dd = tmp;
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break;
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}
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tctx->dd = dd;
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} else {
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dd = tctx->dd;
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}
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spin_unlock_bh(&atmel_sha.lock);
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ctx->dd = dd;
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ctx->flags = 0;
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dev_dbg(dd->dev, "init: digest size: %d\n",
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crypto_ahash_digestsize(tfm));
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if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
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ctx->flags |= SHA_FLAGS_SHA1;
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else if (crypto_ahash_digestsize(tfm) == SHA256_DIGEST_SIZE)
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ctx->flags |= SHA_FLAGS_SHA256;
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ctx->bufcnt = 0;
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ctx->digcnt = 0;
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ctx->buflen = SHA_BUFFER_LEN;
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return 0;
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}
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static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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u32 valcr = 0, valmr = SHA_MR_MODE_AUTO;
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if (likely(dma)) {
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atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
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valmr = SHA_MR_MODE_PDC;
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if (dd->flags & SHA_FLAGS_DUALBUFF)
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valmr = SHA_MR_DUALBUFF;
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} else {
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atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
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}
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if (ctx->flags & SHA_FLAGS_SHA256)
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valmr |= SHA_MR_ALGO_SHA256;
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/* Setting CR_FIRST only for the first iteration */
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if (!ctx->digcnt)
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valcr = SHA_CR_FIRST;
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atmel_sha_write(dd, SHA_CR, valcr);
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atmel_sha_write(dd, SHA_MR, valmr);
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}
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static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
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size_t length, int final)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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int count, len32;
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const u32 *buffer = (const u32 *)buf;
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dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
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ctx->digcnt, length, final);
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atmel_sha_write_ctrl(dd, 0);
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/* should be non-zero before next lines to disable clocks later */
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ctx->digcnt += length;
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if (final)
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dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
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len32 = DIV_ROUND_UP(length, sizeof(u32));
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dd->flags |= SHA_FLAGS_CPU;
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for (count = 0; count < len32; count++)
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atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
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return -EINPROGRESS;
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}
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static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
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size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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int len32;
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dev_dbg(dd->dev, "xmit_pdc: digcnt: %d, length: %d, final: %d\n",
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ctx->digcnt, length1, final);
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len32 = DIV_ROUND_UP(length1, sizeof(u32));
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atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
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atmel_sha_write(dd, SHA_TPR, dma_addr1);
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atmel_sha_write(dd, SHA_TCR, len32);
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len32 = DIV_ROUND_UP(length2, sizeof(u32));
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atmel_sha_write(dd, SHA_TNPR, dma_addr2);
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atmel_sha_write(dd, SHA_TNCR, len32);
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atmel_sha_write_ctrl(dd, 1);
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/* should be non-zero before next lines to disable clocks later */
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ctx->digcnt += length1;
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if (final)
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dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
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dd->flags |= SHA_FLAGS_DMA_ACTIVE;
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/* Start DMA transfer */
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atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
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return -EINPROGRESS;
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}
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static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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int bufcnt;
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atmel_sha_append_sg(ctx);
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atmel_sha_fill_padding(ctx, 0);
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bufcnt = ctx->bufcnt;
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ctx->bufcnt = 0;
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return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
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}
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static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
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struct atmel_sha_reqctx *ctx,
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size_t length, int final)
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{
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ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
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ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
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if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
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dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen +
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SHA1_BLOCK_SIZE);
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return -EINVAL;
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}
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ctx->flags &= ~SHA_FLAGS_SG;
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/* next call does not fail... so no unmap in the case of error */
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return atmel_sha_xmit_pdc(dd, ctx->dma_addr, length, 0, 0, final);
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}
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static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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unsigned int final;
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size_t count;
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atmel_sha_append_sg(ctx);
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final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
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dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
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ctx->bufcnt, ctx->digcnt, final);
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if (final)
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atmel_sha_fill_padding(ctx, 0);
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if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
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count = ctx->bufcnt;
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ctx->bufcnt = 0;
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return atmel_sha_xmit_dma_map(dd, ctx, count, final);
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}
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return 0;
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}
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static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
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{
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struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
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unsigned int length, final, tail;
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struct scatterlist *sg;
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unsigned int count;
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if (!ctx->total)
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return 0;
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if (ctx->bufcnt || ctx->offset)
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return atmel_sha_update_dma_slow(dd);
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dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",
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ctx->digcnt, ctx->bufcnt, ctx->total);
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sg = ctx->sg;
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if (!IS_ALIGNED(sg->offset, sizeof(u32)))
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return atmel_sha_update_dma_slow(dd);
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if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, SHA1_BLOCK_SIZE))
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/* size is not SHA1_BLOCK_SIZE aligned */
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return atmel_sha_update_dma_slow(dd);
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length = min(ctx->total, sg->length);
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if (sg_is_last(sg)) {
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if (!(ctx->flags & SHA_FLAGS_FINUP)) {
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/* not last sg must be SHA1_BLOCK_SIZE aligned */
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tail = length & (SHA1_BLOCK_SIZE - 1);
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length -= tail;
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if (length == 0) {
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/* offset where to start slow */
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ctx->offset = length;
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return atmel_sha_update_dma_slow(dd);
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}
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}
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}
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ctx->total -= length;
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ctx->offset = length; /* offset where to start slow */
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final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
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/* Add padding */
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if (final) {
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tail = length & (SHA1_BLOCK_SIZE - 1);
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length -= tail;
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ctx->total += tail;
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ctx->offset = length; /* offset where to start slow */
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sg = ctx->sg;
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atmel_sha_append_sg(ctx);
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atmel_sha_fill_padding(ctx, length);
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ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
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ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
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if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
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dev_err(dd->dev, "dma %u bytes error\n",
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ctx->buflen + SHA1_BLOCK_SIZE);
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return -EINVAL;
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}
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if (length == 0) {
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ctx->flags &= ~SHA_FLAGS_SG;
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count = ctx->bufcnt;
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ctx->bufcnt = 0;
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return atmel_sha_xmit_pdc(dd, ctx->dma_addr, count, 0,
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0, final);
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} else {
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ctx->sg = sg;
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if (!dma_map_sg(dd->dev, ctx->sg, 1,
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DMA_TO_DEVICE)) {
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dev_err(dd->dev, "dma_map_sg error\n");
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return -EINVAL;
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}
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ctx->flags |= SHA_FLAGS_SG;
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count = ctx->bufcnt;
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ctx->bufcnt = 0;
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return atmel_sha_xmit_pdc(dd, sg_dma_address(ctx->sg),
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length, ctx->dma_addr, count, final);
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}
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}
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if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
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dev_err(dd->dev, "dma_map_sg error\n");
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return -EINVAL;
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}
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ctx->flags |= SHA_FLAGS_SG;
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/* next call does not fail... so no unmap in the case of error */
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return atmel_sha_xmit_pdc(dd, sg_dma_address(ctx->sg), length, 0,
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0, final);
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}
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static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
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{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
|
|
|
|
if (ctx->flags & SHA_FLAGS_SG) {
|
|
dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
|
|
if (ctx->sg->length == ctx->offset) {
|
|
ctx->sg = sg_next(ctx->sg);
|
|
if (ctx->sg)
|
|
ctx->offset = 0;
|
|
}
|
|
if (ctx->flags & SHA_FLAGS_PAD)
|
|
dma_unmap_single(dd->dev, ctx->dma_addr,
|
|
ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
|
|
} else {
|
|
dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
|
|
SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_sha_update_req(struct atmel_sha_dev *dd)
|
|
{
|
|
struct ahash_request *req = dd->req;
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
int err;
|
|
|
|
dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
|
|
ctx->total, ctx->digcnt, (ctx->flags & SHA_FLAGS_FINUP) != 0);
|
|
|
|
if (ctx->flags & SHA_FLAGS_CPU)
|
|
err = atmel_sha_update_cpu(dd);
|
|
else
|
|
err = atmel_sha_update_dma_start(dd);
|
|
|
|
/* wait for dma completion before can take more data */
|
|
dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n",
|
|
err, ctx->digcnt);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int atmel_sha_final_req(struct atmel_sha_dev *dd)
|
|
{
|
|
struct ahash_request *req = dd->req;
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
int err = 0;
|
|
int count;
|
|
|
|
if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
|
|
atmel_sha_fill_padding(ctx, 0);
|
|
count = ctx->bufcnt;
|
|
ctx->bufcnt = 0;
|
|
err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
|
|
}
|
|
/* faster to handle last block with cpu */
|
|
else {
|
|
atmel_sha_fill_padding(ctx, 0);
|
|
count = ctx->bufcnt;
|
|
ctx->bufcnt = 0;
|
|
err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
|
|
}
|
|
|
|
dev_dbg(dd->dev, "final_req: err: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void atmel_sha_copy_hash(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
u32 *hash = (u32 *)ctx->digest;
|
|
int i;
|
|
|
|
if (likely(ctx->flags & SHA_FLAGS_SHA1))
|
|
for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
|
|
hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
|
|
else
|
|
for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(u32); i++)
|
|
hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
|
|
}
|
|
|
|
static void atmel_sha_copy_ready_hash(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
|
|
if (!req->result)
|
|
return;
|
|
|
|
if (likely(ctx->flags & SHA_FLAGS_SHA1))
|
|
memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
|
|
else
|
|
memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
|
|
}
|
|
|
|
static int atmel_sha_finish(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
struct atmel_sha_dev *dd = ctx->dd;
|
|
int err = 0;
|
|
|
|
if (ctx->digcnt)
|
|
atmel_sha_copy_ready_hash(req);
|
|
|
|
dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt,
|
|
ctx->bufcnt);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void atmel_sha_finish_req(struct ahash_request *req, int err)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
struct atmel_sha_dev *dd = ctx->dd;
|
|
|
|
if (!err) {
|
|
atmel_sha_copy_hash(req);
|
|
if (SHA_FLAGS_FINAL & dd->flags)
|
|
err = atmel_sha_finish(req);
|
|
} else {
|
|
ctx->flags |= SHA_FLAGS_ERROR;
|
|
}
|
|
|
|
/* atomic operation is not needed here */
|
|
dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
|
|
SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);
|
|
|
|
clk_disable_unprepare(dd->iclk);
|
|
|
|
if (req->base.complete)
|
|
req->base.complete(&req->base, err);
|
|
|
|
/* handle new request */
|
|
tasklet_schedule(&dd->done_task);
|
|
}
|
|
|
|
static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
|
|
{
|
|
clk_prepare_enable(dd->iclk);
|
|
|
|
if (SHA_FLAGS_INIT & dd->flags) {
|
|
atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
|
|
atmel_sha_dualbuff_test(dd);
|
|
dd->flags |= SHA_FLAGS_INIT;
|
|
dd->err = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
|
|
struct ahash_request *req)
|
|
{
|
|
struct crypto_async_request *async_req, *backlog;
|
|
struct atmel_sha_reqctx *ctx;
|
|
unsigned long flags;
|
|
int err = 0, ret = 0;
|
|
|
|
spin_lock_irqsave(&dd->lock, flags);
|
|
if (req)
|
|
ret = ahash_enqueue_request(&dd->queue, req);
|
|
|
|
if (SHA_FLAGS_BUSY & dd->flags) {
|
|
spin_unlock_irqrestore(&dd->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
backlog = crypto_get_backlog(&dd->queue);
|
|
async_req = crypto_dequeue_request(&dd->queue);
|
|
if (async_req)
|
|
dd->flags |= SHA_FLAGS_BUSY;
|
|
|
|
spin_unlock_irqrestore(&dd->lock, flags);
|
|
|
|
if (!async_req)
|
|
return ret;
|
|
|
|
if (backlog)
|
|
backlog->complete(backlog, -EINPROGRESS);
|
|
|
|
req = ahash_request_cast(async_req);
|
|
dd->req = req;
|
|
ctx = ahash_request_ctx(req);
|
|
|
|
dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
|
|
ctx->op, req->nbytes);
|
|
|
|
err = atmel_sha_hw_init(dd);
|
|
|
|
if (err)
|
|
goto err1;
|
|
|
|
if (ctx->op == SHA_OP_UPDATE) {
|
|
err = atmel_sha_update_req(dd);
|
|
if (err != -EINPROGRESS && (ctx->flags & SHA_FLAGS_FINUP)) {
|
|
/* no final() after finup() */
|
|
err = atmel_sha_final_req(dd);
|
|
}
|
|
} else if (ctx->op == SHA_OP_FINAL) {
|
|
err = atmel_sha_final_req(dd);
|
|
}
|
|
|
|
err1:
|
|
if (err != -EINPROGRESS)
|
|
/* done_task will not finish it, so do it here */
|
|
atmel_sha_finish_req(req, err);
|
|
|
|
dev_dbg(dd->dev, "exit, err: %d\n", err);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
|
|
struct atmel_sha_dev *dd = tctx->dd;
|
|
|
|
ctx->op = op;
|
|
|
|
return atmel_sha_handle_queue(dd, req);
|
|
}
|
|
|
|
static int atmel_sha_update(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
|
|
if (!req->nbytes)
|
|
return 0;
|
|
|
|
ctx->total = req->nbytes;
|
|
ctx->sg = req->src;
|
|
ctx->offset = 0;
|
|
|
|
if (ctx->flags & SHA_FLAGS_FINUP) {
|
|
if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
|
|
/* faster to use CPU for short transfers */
|
|
ctx->flags |= SHA_FLAGS_CPU;
|
|
} else if (ctx->bufcnt + ctx->total < ctx->buflen) {
|
|
atmel_sha_append_sg(ctx);
|
|
return 0;
|
|
}
|
|
return atmel_sha_enqueue(req, SHA_OP_UPDATE);
|
|
}
|
|
|
|
static int atmel_sha_final(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
|
|
struct atmel_sha_dev *dd = tctx->dd;
|
|
|
|
int err = 0;
|
|
|
|
ctx->flags |= SHA_FLAGS_FINUP;
|
|
|
|
if (ctx->flags & SHA_FLAGS_ERROR)
|
|
return 0; /* uncompleted hash is not needed */
|
|
|
|
if (ctx->bufcnt) {
|
|
return atmel_sha_enqueue(req, SHA_OP_FINAL);
|
|
} else if (!(ctx->flags & SHA_FLAGS_PAD)) { /* add padding */
|
|
err = atmel_sha_hw_init(dd);
|
|
if (err)
|
|
goto err1;
|
|
|
|
dd->flags |= SHA_FLAGS_BUSY;
|
|
err = atmel_sha_final_req(dd);
|
|
} else {
|
|
/* copy ready hash (+ finalize hmac) */
|
|
return atmel_sha_finish(req);
|
|
}
|
|
|
|
err1:
|
|
if (err != -EINPROGRESS)
|
|
/* done_task will not finish it, so do it here */
|
|
atmel_sha_finish_req(req, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int atmel_sha_finup(struct ahash_request *req)
|
|
{
|
|
struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
|
|
int err1, err2;
|
|
|
|
ctx->flags |= SHA_FLAGS_FINUP;
|
|
|
|
err1 = atmel_sha_update(req);
|
|
if (err1 == -EINPROGRESS || err1 == -EBUSY)
|
|
return err1;
|
|
|
|
/*
|
|
* final() has to be always called to cleanup resources
|
|
* even if udpate() failed, except EINPROGRESS
|
|
*/
|
|
err2 = atmel_sha_final(req);
|
|
|
|
return err1 ?: err2;
|
|
}
|
|
|
|
static int atmel_sha_digest(struct ahash_request *req)
|
|
{
|
|
return atmel_sha_init(req) ?: atmel_sha_finup(req);
|
|
}
|
|
|
|
static int atmel_sha_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
|
|
{
|
|
struct atmel_sha_ctx *tctx = crypto_tfm_ctx(tfm);
|
|
const char *alg_name = crypto_tfm_alg_name(tfm);
|
|
|
|
/* Allocate a fallback and abort if it failed. */
|
|
tctx->fallback = crypto_alloc_shash(alg_name, 0,
|
|
CRYPTO_ALG_NEED_FALLBACK);
|
|
if (IS_ERR(tctx->fallback)) {
|
|
pr_err("atmel-sha: fallback driver '%s' could not be loaded.\n",
|
|
alg_name);
|
|
return PTR_ERR(tctx->fallback);
|
|
}
|
|
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
|
|
sizeof(struct atmel_sha_reqctx) +
|
|
SHA_BUFFER_LEN + SHA256_BLOCK_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_sha_cra_init(struct crypto_tfm *tfm)
|
|
{
|
|
return atmel_sha_cra_init_alg(tfm, NULL);
|
|
}
|
|
|
|
static void atmel_sha_cra_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct atmel_sha_ctx *tctx = crypto_tfm_ctx(tfm);
|
|
|
|
crypto_free_shash(tctx->fallback);
|
|
tctx->fallback = NULL;
|
|
}
|
|
|
|
static struct ahash_alg sha_algs[] = {
|
|
{
|
|
.init = atmel_sha_init,
|
|
.update = atmel_sha_update,
|
|
.final = atmel_sha_final,
|
|
.finup = atmel_sha_finup,
|
|
.digest = atmel_sha_digest,
|
|
.halg = {
|
|
.digestsize = SHA1_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "sha1",
|
|
.cra_driver_name = "atmel-sha1",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = SHA1_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct atmel_sha_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = atmel_sha_cra_init,
|
|
.cra_exit = atmel_sha_cra_exit,
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.init = atmel_sha_init,
|
|
.update = atmel_sha_update,
|
|
.final = atmel_sha_final,
|
|
.finup = atmel_sha_finup,
|
|
.digest = atmel_sha_digest,
|
|
.halg = {
|
|
.digestsize = SHA256_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "sha256",
|
|
.cra_driver_name = "atmel-sha256",
|
|
.cra_priority = 100,
|
|
.cra_flags = CRYPTO_ALG_ASYNC |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = SHA256_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct atmel_sha_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = atmel_sha_cra_init,
|
|
.cra_exit = atmel_sha_cra_exit,
|
|
}
|
|
}
|
|
},
|
|
};
|
|
|
|
static void atmel_sha_done_task(unsigned long data)
|
|
{
|
|
struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
|
|
int err = 0;
|
|
|
|
if (!(SHA_FLAGS_BUSY & dd->flags)) {
|
|
atmel_sha_handle_queue(dd, NULL);
|
|
return;
|
|
}
|
|
|
|
if (SHA_FLAGS_CPU & dd->flags) {
|
|
if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
|
|
dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
|
|
goto finish;
|
|
}
|
|
} else if (SHA_FLAGS_DMA_READY & dd->flags) {
|
|
if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
|
|
dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
|
|
atmel_sha_update_dma_stop(dd);
|
|
if (dd->err) {
|
|
err = dd->err;
|
|
goto finish;
|
|
}
|
|
}
|
|
if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
|
|
/* hash or semi-hash ready */
|
|
dd->flags &= ~(SHA_FLAGS_DMA_READY |
|
|
SHA_FLAGS_OUTPUT_READY);
|
|
err = atmel_sha_update_dma_start(dd);
|
|
if (err != -EINPROGRESS)
|
|
goto finish;
|
|
}
|
|
}
|
|
return;
|
|
|
|
finish:
|
|
/* finish curent request */
|
|
atmel_sha_finish_req(dd->req, err);
|
|
}
|
|
|
|
static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
|
|
{
|
|
struct atmel_sha_dev *sha_dd = dev_id;
|
|
u32 reg;
|
|
|
|
reg = atmel_sha_read(sha_dd, SHA_ISR);
|
|
if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
|
|
atmel_sha_write(sha_dd, SHA_IDR, reg);
|
|
if (SHA_FLAGS_BUSY & sha_dd->flags) {
|
|
sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
|
|
if (!(SHA_FLAGS_CPU & sha_dd->flags))
|
|
sha_dd->flags |= SHA_FLAGS_DMA_READY;
|
|
tasklet_schedule(&sha_dd->done_task);
|
|
} else {
|
|
dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(sha_algs); i++)
|
|
crypto_unregister_ahash(&sha_algs[i]);
|
|
}
|
|
|
|
static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
|
|
{
|
|
int err, i, j;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
|
|
err = crypto_register_ahash(&sha_algs[i]);
|
|
if (err)
|
|
goto err_sha_algs;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_sha_algs:
|
|
for (j = 0; j < i; j++)
|
|
crypto_unregister_ahash(&sha_algs[j]);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int atmel_sha_probe(struct platform_device *pdev)
|
|
{
|
|
struct atmel_sha_dev *sha_dd;
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *sha_res;
|
|
unsigned long sha_phys_size;
|
|
int err;
|
|
|
|
sha_dd = kzalloc(sizeof(struct atmel_sha_dev), GFP_KERNEL);
|
|
if (sha_dd == NULL) {
|
|
dev_err(dev, "unable to alloc data struct.\n");
|
|
err = -ENOMEM;
|
|
goto sha_dd_err;
|
|
}
|
|
|
|
sha_dd->dev = dev;
|
|
|
|
platform_set_drvdata(pdev, sha_dd);
|
|
|
|
INIT_LIST_HEAD(&sha_dd->list);
|
|
|
|
tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
|
|
(unsigned long)sha_dd);
|
|
|
|
crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
|
|
|
|
sha_dd->irq = -1;
|
|
|
|
/* Get the base address */
|
|
sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!sha_res) {
|
|
dev_err(dev, "no MEM resource info\n");
|
|
err = -ENODEV;
|
|
goto res_err;
|
|
}
|
|
sha_dd->phys_base = sha_res->start;
|
|
sha_phys_size = resource_size(sha_res);
|
|
|
|
/* Get the IRQ */
|
|
sha_dd->irq = platform_get_irq(pdev, 0);
|
|
if (sha_dd->irq < 0) {
|
|
dev_err(dev, "no IRQ resource info\n");
|
|
err = sha_dd->irq;
|
|
goto res_err;
|
|
}
|
|
|
|
err = request_irq(sha_dd->irq, atmel_sha_irq, IRQF_SHARED, "atmel-sha",
|
|
sha_dd);
|
|
if (err) {
|
|
dev_err(dev, "unable to request sha irq.\n");
|
|
goto res_err;
|
|
}
|
|
|
|
/* Initializing the clock */
|
|
sha_dd->iclk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(sha_dd->iclk)) {
|
|
dev_err(dev, "clock intialization failed.\n");
|
|
err = PTR_ERR(sha_dd->iclk);
|
|
goto clk_err;
|
|
}
|
|
|
|
sha_dd->io_base = ioremap(sha_dd->phys_base, sha_phys_size);
|
|
if (!sha_dd->io_base) {
|
|
dev_err(dev, "can't ioremap\n");
|
|
err = -ENOMEM;
|
|
goto sha_io_err;
|
|
}
|
|
|
|
spin_lock(&atmel_sha.lock);
|
|
list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
|
|
spin_unlock(&atmel_sha.lock);
|
|
|
|
err = atmel_sha_register_algs(sha_dd);
|
|
if (err)
|
|
goto err_algs;
|
|
|
|
dev_info(dev, "Atmel SHA1/SHA256\n");
|
|
|
|
return 0;
|
|
|
|
err_algs:
|
|
spin_lock(&atmel_sha.lock);
|
|
list_del(&sha_dd->list);
|
|
spin_unlock(&atmel_sha.lock);
|
|
iounmap(sha_dd->io_base);
|
|
sha_io_err:
|
|
clk_put(sha_dd->iclk);
|
|
clk_err:
|
|
free_irq(sha_dd->irq, sha_dd);
|
|
res_err:
|
|
tasklet_kill(&sha_dd->done_task);
|
|
kfree(sha_dd);
|
|
sha_dd = NULL;
|
|
sha_dd_err:
|
|
dev_err(dev, "initialization failed.\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
static int atmel_sha_remove(struct platform_device *pdev)
|
|
{
|
|
static struct atmel_sha_dev *sha_dd;
|
|
|
|
sha_dd = platform_get_drvdata(pdev);
|
|
if (!sha_dd)
|
|
return -ENODEV;
|
|
spin_lock(&atmel_sha.lock);
|
|
list_del(&sha_dd->list);
|
|
spin_unlock(&atmel_sha.lock);
|
|
|
|
atmel_sha_unregister_algs(sha_dd);
|
|
|
|
tasklet_kill(&sha_dd->done_task);
|
|
|
|
iounmap(sha_dd->io_base);
|
|
|
|
clk_put(sha_dd->iclk);
|
|
|
|
if (sha_dd->irq >= 0)
|
|
free_irq(sha_dd->irq, sha_dd);
|
|
|
|
kfree(sha_dd);
|
|
sha_dd = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver atmel_sha_driver = {
|
|
.probe = atmel_sha_probe,
|
|
.remove = atmel_sha_remove,
|
|
.driver = {
|
|
.name = "atmel_sha",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(atmel_sha_driver);
|
|
|
|
MODULE_DESCRIPTION("Atmel SHA1/SHA256 hw acceleration support.");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
|