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linux-next/drivers/crypto/omap-sham.c
Tero Kristo 182e283f3e crypto: omap-sham - shrink the internal buffer size 
The current internal buffer size is way too large for crypto core, so
shrink it to be smaller. This makes the buffer to fit into the space
reserved for the export/import buffers also.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-09-22 18:32:53 +08:00

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/*
* Cryptographic API.
*
* Support for OMAP SHA1/MD5 HW acceleration.
*
* Copyright (c) 2010 Nokia Corporation
* Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
* Copyright (c) 2011 Texas Instruments Incorporated
*
* 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.
*
* Some ideas are from old omap-sha1-md5.c driver.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/delay.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>
#include <crypto/sha.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#define MD5_DIGEST_SIZE 16
#define SHA_REG_IDIGEST(dd, x) ((dd)->pdata->idigest_ofs + ((x)*0x04))
#define SHA_REG_DIN(dd, x) ((dd)->pdata->din_ofs + ((x) * 0x04))
#define SHA_REG_DIGCNT(dd) ((dd)->pdata->digcnt_ofs)
#define SHA_REG_ODIGEST(dd, x) ((dd)->pdata->odigest_ofs + (x * 0x04))
#define SHA_REG_CTRL 0x18
#define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5)
#define SHA_REG_CTRL_CLOSE_HASH (1 << 4)
#define SHA_REG_CTRL_ALGO_CONST (1 << 3)
#define SHA_REG_CTRL_ALGO (1 << 2)
#define SHA_REG_CTRL_INPUT_READY (1 << 1)
#define SHA_REG_CTRL_OUTPUT_READY (1 << 0)
#define SHA_REG_REV(dd) ((dd)->pdata->rev_ofs)
#define SHA_REG_MASK(dd) ((dd)->pdata->mask_ofs)
#define SHA_REG_MASK_DMA_EN (1 << 3)
#define SHA_REG_MASK_IT_EN (1 << 2)
#define SHA_REG_MASK_SOFTRESET (1 << 1)
#define SHA_REG_AUTOIDLE (1 << 0)
#define SHA_REG_SYSSTATUS(dd) ((dd)->pdata->sysstatus_ofs)
#define SHA_REG_SYSSTATUS_RESETDONE (1 << 0)
#define SHA_REG_MODE(dd) ((dd)->pdata->mode_ofs)
#define SHA_REG_MODE_HMAC_OUTER_HASH (1 << 7)
#define SHA_REG_MODE_HMAC_KEY_PROC (1 << 5)
#define SHA_REG_MODE_CLOSE_HASH (1 << 4)
#define SHA_REG_MODE_ALGO_CONSTANT (1 << 3)
#define SHA_REG_MODE_ALGO_MASK (7 << 0)
#define SHA_REG_MODE_ALGO_MD5_128 (0 << 1)
#define SHA_REG_MODE_ALGO_SHA1_160 (1 << 1)
#define SHA_REG_MODE_ALGO_SHA2_224 (2 << 1)
#define SHA_REG_MODE_ALGO_SHA2_256 (3 << 1)
#define SHA_REG_MODE_ALGO_SHA2_384 (1 << 0)
#define SHA_REG_MODE_ALGO_SHA2_512 (3 << 0)
#define SHA_REG_LENGTH(dd) ((dd)->pdata->length_ofs)
#define SHA_REG_IRQSTATUS 0x118
#define SHA_REG_IRQSTATUS_CTX_RDY (1 << 3)
#define SHA_REG_IRQSTATUS_PARTHASH_RDY (1 << 2)
#define SHA_REG_IRQSTATUS_INPUT_RDY (1 << 1)
#define SHA_REG_IRQSTATUS_OUTPUT_RDY (1 << 0)
#define SHA_REG_IRQENA 0x11C
#define SHA_REG_IRQENA_CTX_RDY (1 << 3)
#define SHA_REG_IRQENA_PARTHASH_RDY (1 << 2)
#define SHA_REG_IRQENA_INPUT_RDY (1 << 1)
#define SHA_REG_IRQENA_OUTPUT_RDY (1 << 0)
#define DEFAULT_TIMEOUT_INTERVAL HZ
#define DEFAULT_AUTOSUSPEND_DELAY 1000
/* mostly device flags */
#define FLAGS_BUSY 0
#define FLAGS_FINAL 1
#define FLAGS_DMA_ACTIVE 2
#define FLAGS_OUTPUT_READY 3
#define FLAGS_INIT 4
#define FLAGS_CPU 5
#define FLAGS_DMA_READY 6
#define FLAGS_AUTO_XOR 7
#define FLAGS_BE32_SHA1 8
#define FLAGS_SGS_COPIED 9
#define FLAGS_SGS_ALLOCED 10
/* context flags */
#define FLAGS_FINUP 16
#define FLAGS_MODE_SHIFT 18
#define FLAGS_MODE_MASK (SHA_REG_MODE_ALGO_MASK << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_MD5 (SHA_REG_MODE_ALGO_MD5_128 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA1 (SHA_REG_MODE_ALGO_SHA1_160 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA224 (SHA_REG_MODE_ALGO_SHA2_224 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA256 (SHA_REG_MODE_ALGO_SHA2_256 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA384 (SHA_REG_MODE_ALGO_SHA2_384 << FLAGS_MODE_SHIFT)
#define FLAGS_MODE_SHA512 (SHA_REG_MODE_ALGO_SHA2_512 << FLAGS_MODE_SHIFT)
#define FLAGS_HMAC 21
#define FLAGS_ERROR 22
#define OP_UPDATE 1
#define OP_FINAL 2
#define OMAP_ALIGN_MASK (sizeof(u32)-1)
#define OMAP_ALIGNED __attribute__((aligned(sizeof(u32))))
#define BUFLEN SHA512_BLOCK_SIZE
#define OMAP_SHA_DMA_THRESHOLD 256
struct omap_sham_dev;
struct omap_sham_reqctx {
struct omap_sham_dev *dd;
unsigned long flags;
unsigned long op;
u8 digest[SHA512_DIGEST_SIZE] OMAP_ALIGNED;
size_t digcnt;
size_t bufcnt;
size_t buflen;
/* walk state */
struct scatterlist *sg;
struct scatterlist sgl[2];
int offset; /* offset in current sg */
int sg_len;
unsigned int total; /* total request */
u8 buffer[0] OMAP_ALIGNED;
};
struct omap_sham_hmac_ctx {
struct crypto_shash *shash;
u8 ipad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
u8 opad[SHA512_BLOCK_SIZE] OMAP_ALIGNED;
};
struct omap_sham_ctx {
struct omap_sham_dev *dd;
unsigned long flags;
/* fallback stuff */
struct crypto_shash *fallback;
struct omap_sham_hmac_ctx base[0];
};
#define OMAP_SHAM_QUEUE_LENGTH 10
struct omap_sham_algs_info {
struct ahash_alg *algs_list;
unsigned int size;
unsigned int registered;
};
struct omap_sham_pdata {
struct omap_sham_algs_info *algs_info;
unsigned int algs_info_size;
unsigned long flags;
int digest_size;
void (*copy_hash)(struct ahash_request *req, int out);
void (*write_ctrl)(struct omap_sham_dev *dd, size_t length,
int final, int dma);
void (*trigger)(struct omap_sham_dev *dd, size_t length);
int (*poll_irq)(struct omap_sham_dev *dd);
irqreturn_t (*intr_hdlr)(int irq, void *dev_id);
u32 odigest_ofs;
u32 idigest_ofs;
u32 din_ofs;
u32 digcnt_ofs;
u32 rev_ofs;
u32 mask_ofs;
u32 sysstatus_ofs;
u32 mode_ofs;
u32 length_ofs;
u32 major_mask;
u32 major_shift;
u32 minor_mask;
u32 minor_shift;
};
struct omap_sham_dev {
struct list_head list;
unsigned long phys_base;
struct device *dev;
void __iomem *io_base;
int irq;
spinlock_t lock;
int err;
struct dma_chan *dma_lch;
struct tasklet_struct done_task;
u8 polling_mode;
u8 xmit_buf[BUFLEN];
unsigned long flags;
struct crypto_queue queue;
struct ahash_request *req;
const struct omap_sham_pdata *pdata;
};
struct omap_sham_drv {
struct list_head dev_list;
spinlock_t lock;
unsigned long flags;
};
static struct omap_sham_drv sham = {
.dev_list = LIST_HEAD_INIT(sham.dev_list),
.lock = __SPIN_LOCK_UNLOCKED(sham.lock),
};
static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
{
return __raw_readl(dd->io_base + offset);
}
static inline void omap_sham_write(struct omap_sham_dev *dd,
u32 offset, u32 value)
{
__raw_writel(value, dd->io_base + offset);
}
static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
u32 value, u32 mask)
{
u32 val;
val = omap_sham_read(dd, address);
val &= ~mask;
val |= value;
omap_sham_write(dd, address, val);
}
static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
{
unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
while (!(omap_sham_read(dd, offset) & bit)) {
if (time_is_before_jiffies(timeout))
return -ETIMEDOUT;
}
return 0;
}
static void omap_sham_copy_hash_omap2(struct ahash_request *req, int out)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = ctx->dd;
u32 *hash = (u32 *)ctx->digest;
int i;
for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
if (out)
hash[i] = omap_sham_read(dd, SHA_REG_IDIGEST(dd, i));
else
omap_sham_write(dd, SHA_REG_IDIGEST(dd, i), hash[i]);
}
}
static void omap_sham_copy_hash_omap4(struct ahash_request *req, int out)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = ctx->dd;
int i;
if (ctx->flags & BIT(FLAGS_HMAC)) {
struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
struct omap_sham_hmac_ctx *bctx = tctx->base;
u32 *opad = (u32 *)bctx->opad;
for (i = 0; i < dd->pdata->digest_size / sizeof(u32); i++) {
if (out)
opad[i] = omap_sham_read(dd,
SHA_REG_ODIGEST(dd, i));
else
omap_sham_write(dd, SHA_REG_ODIGEST(dd, i),
opad[i]);
}
}
omap_sham_copy_hash_omap2(req, out);
}
static void omap_sham_copy_ready_hash(struct ahash_request *req)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
u32 *in = (u32 *)ctx->digest;
u32 *hash = (u32 *)req->result;
int i, d, big_endian = 0;
if (!hash)
return;
switch (ctx->flags & FLAGS_MODE_MASK) {
case FLAGS_MODE_MD5:
d = MD5_DIGEST_SIZE / sizeof(u32);
break;
case FLAGS_MODE_SHA1:
/* OMAP2 SHA1 is big endian */
if (test_bit(FLAGS_BE32_SHA1, &ctx->dd->flags))
big_endian = 1;
d = SHA1_DIGEST_SIZE / sizeof(u32);
break;
case FLAGS_MODE_SHA224:
d = SHA224_DIGEST_SIZE / sizeof(u32);
break;
case FLAGS_MODE_SHA256:
d = SHA256_DIGEST_SIZE / sizeof(u32);
break;
case FLAGS_MODE_SHA384:
d = SHA384_DIGEST_SIZE / sizeof(u32);
break;
case FLAGS_MODE_SHA512:
d = SHA512_DIGEST_SIZE / sizeof(u32);
break;
default:
d = 0;
}
if (big_endian)
for (i = 0; i < d; i++)
hash[i] = be32_to_cpu(in[i]);
else
for (i = 0; i < d; i++)
hash[i] = le32_to_cpu(in[i]);
}
static int omap_sham_hw_init(struct omap_sham_dev *dd)
{
int err;
err = pm_runtime_get_sync(dd->dev);
if (err < 0) {
dev_err(dd->dev, "failed to get sync: %d\n", err);
return err;
}
if (!test_bit(FLAGS_INIT, &dd->flags)) {
set_bit(FLAGS_INIT, &dd->flags);
dd->err = 0;
}
return 0;
}
static void omap_sham_write_ctrl_omap2(struct omap_sham_dev *dd, size_t length,
int final, int dma)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
u32 val = length << 5, mask;
if (likely(ctx->digcnt))
omap_sham_write(dd, SHA_REG_DIGCNT(dd), ctx->digcnt);
omap_sham_write_mask(dd, SHA_REG_MASK(dd),
SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
/*
* Setting ALGO_CONST only for the first iteration
* and CLOSE_HASH only for the last one.
*/
if ((ctx->flags & FLAGS_MODE_MASK) == FLAGS_MODE_SHA1)
val |= SHA_REG_CTRL_ALGO;
if (!ctx->digcnt)
val |= SHA_REG_CTRL_ALGO_CONST;
if (final)
val |= SHA_REG_CTRL_CLOSE_HASH;
mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
}
static void omap_sham_trigger_omap2(struct omap_sham_dev *dd, size_t length)
{
}
static int omap_sham_poll_irq_omap2(struct omap_sham_dev *dd)
{
return omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY);
}
static int get_block_size(struct omap_sham_reqctx *ctx)
{
int d;
switch (ctx->flags & FLAGS_MODE_MASK) {
case FLAGS_MODE_MD5:
case FLAGS_MODE_SHA1:
d = SHA1_BLOCK_SIZE;
break;
case FLAGS_MODE_SHA224:
case FLAGS_MODE_SHA256:
d = SHA256_BLOCK_SIZE;
break;
case FLAGS_MODE_SHA384:
case FLAGS_MODE_SHA512:
d = SHA512_BLOCK_SIZE;
break;
default:
d = 0;
}
return d;
}
static void omap_sham_write_n(struct omap_sham_dev *dd, u32 offset,
u32 *value, int count)
{
for (; count--; value++, offset += 4)
omap_sham_write(dd, offset, *value);
}
static void omap_sham_write_ctrl_omap4(struct omap_sham_dev *dd, size_t length,
int final, int dma)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
u32 val, mask;
/*
* Setting ALGO_CONST only for the first iteration and
* CLOSE_HASH only for the last one. Note that flags mode bits
* correspond to algorithm encoding in mode register.
*/
val = (ctx->flags & FLAGS_MODE_MASK) >> (FLAGS_MODE_SHIFT);
if (!ctx->digcnt) {
struct crypto_ahash *tfm = crypto_ahash_reqtfm(dd->req);
struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
struct omap_sham_hmac_ctx *bctx = tctx->base;
int bs, nr_dr;
val |= SHA_REG_MODE_ALGO_CONSTANT;
if (ctx->flags & BIT(FLAGS_HMAC)) {
bs = get_block_size(ctx);
nr_dr = bs / (2 * sizeof(u32));
val |= SHA_REG_MODE_HMAC_KEY_PROC;
omap_sham_write_n(dd, SHA_REG_ODIGEST(dd, 0),
(u32 *)bctx->ipad, nr_dr);
omap_sham_write_n(dd, SHA_REG_IDIGEST(dd, 0),
(u32 *)bctx->ipad + nr_dr, nr_dr);
ctx->digcnt += bs;
}
}
if (final) {
val |= SHA_REG_MODE_CLOSE_HASH;
if (ctx->flags & BIT(FLAGS_HMAC))
val |= SHA_REG_MODE_HMAC_OUTER_HASH;
}
mask = SHA_REG_MODE_ALGO_CONSTANT | SHA_REG_MODE_CLOSE_HASH |
SHA_REG_MODE_ALGO_MASK | SHA_REG_MODE_HMAC_OUTER_HASH |
SHA_REG_MODE_HMAC_KEY_PROC;
dev_dbg(dd->dev, "ctrl: %08x, flags: %08lx\n", val, ctx->flags);
omap_sham_write_mask(dd, SHA_REG_MODE(dd), val, mask);
omap_sham_write(dd, SHA_REG_IRQENA, SHA_REG_IRQENA_OUTPUT_RDY);
omap_sham_write_mask(dd, SHA_REG_MASK(dd),
SHA_REG_MASK_IT_EN |
(dma ? SHA_REG_MASK_DMA_EN : 0),
SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
}
static void omap_sham_trigger_omap4(struct omap_sham_dev *dd, size_t length)
{
omap_sham_write(dd, SHA_REG_LENGTH(dd), length);
}
static int omap_sham_poll_irq_omap4(struct omap_sham_dev *dd)
{
return omap_sham_wait(dd, SHA_REG_IRQSTATUS,
SHA_REG_IRQSTATUS_INPUT_RDY);
}
static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, size_t length,
int final)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
int count, len32, bs32, offset = 0;
const u32 *buffer;
int mlen;
struct sg_mapping_iter mi;
dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
ctx->digcnt, length, final);
dd->pdata->write_ctrl(dd, length, final, 0);
dd->pdata->trigger(dd, length);
/* should be non-zero before next lines to disable clocks later */
ctx->digcnt += length;
ctx->total -= length;
if (final)
set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
set_bit(FLAGS_CPU, &dd->flags);
len32 = DIV_ROUND_UP(length, sizeof(u32));
bs32 = get_block_size(ctx) / sizeof(u32);
sg_miter_start(&mi, ctx->sg, ctx->sg_len,
SG_MITER_FROM_SG | SG_MITER_ATOMIC);
mlen = 0;
while (len32) {
if (dd->pdata->poll_irq(dd))
return -ETIMEDOUT;
for (count = 0; count < min(len32, bs32); count++, offset++) {
if (!mlen) {
sg_miter_next(&mi);
mlen = mi.length;
if (!mlen) {
pr_err("sg miter failure.\n");
return -EINVAL;
}
offset = 0;
buffer = mi.addr;
}
omap_sham_write(dd, SHA_REG_DIN(dd, count),
buffer[offset]);
mlen -= 4;
}
len32 -= min(len32, bs32);
}
sg_miter_stop(&mi);
return -EINPROGRESS;
}
static void omap_sham_dma_callback(void *param)
{
struct omap_sham_dev *dd = param;
set_bit(FLAGS_DMA_READY, &dd->flags);
tasklet_schedule(&dd->done_task);
}
static int omap_sham_xmit_dma(struct omap_sham_dev *dd, size_t length,
int final)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
struct dma_async_tx_descriptor *tx;
struct dma_slave_config cfg;
int ret;
dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
ctx->digcnt, length, final);
if (!dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE)) {
dev_err(dd->dev, "dma_map_sg error\n");
return -EINVAL;
}
memset(&cfg, 0, sizeof(cfg));
cfg.dst_addr = dd->phys_base + SHA_REG_DIN(dd, 0);
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.dst_maxburst = get_block_size(ctx) / DMA_SLAVE_BUSWIDTH_4_BYTES;
ret = dmaengine_slave_config(dd->dma_lch, &cfg);
if (ret) {
pr_err("omap-sham: can't configure dmaengine slave: %d\n", ret);
return ret;
}
tx = dmaengine_prep_slave_sg(dd->dma_lch, ctx->sg, ctx->sg_len,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!tx) {
dev_err(dd->dev, "prep_slave_sg failed\n");
return -EINVAL;
}
tx->callback = omap_sham_dma_callback;
tx->callback_param = dd;
dd->pdata->write_ctrl(dd, length, final, 1);
ctx->digcnt += length;
ctx->total -= length;
if (final)
set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
set_bit(FLAGS_DMA_ACTIVE, &dd->flags);
dmaengine_submit(tx);
dma_async_issue_pending(dd->dma_lch);
dd->pdata->trigger(dd, length);
return -EINPROGRESS;
}
static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx,
struct scatterlist *sg, int bs, int new_len)
{
int n = sg_nents(sg);
struct scatterlist *tmp;
int offset = ctx->offset;
if (ctx->bufcnt)
n++;
ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
if (!ctx->sg)
return -ENOMEM;
sg_init_table(ctx->sg, n);
tmp = ctx->sg;
ctx->sg_len = 0;
if (ctx->bufcnt) {
sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
tmp = sg_next(tmp);
ctx->sg_len++;
}
while (sg && new_len) {
int len = sg->length - offset;
if (offset) {
offset -= sg->length;
if (offset < 0)
offset = 0;
}
if (new_len < len)
len = new_len;
if (len > 0) {
new_len -= len;
sg_set_page(tmp, sg_page(sg), len, sg->offset);
if (new_len <= 0)
sg_mark_end(tmp);
tmp = sg_next(tmp);
ctx->sg_len++;
}
sg = sg_next(sg);
}
set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags);
ctx->bufcnt = 0;
return 0;
}
static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
struct scatterlist *sg, int bs, int new_len)
{
int pages;
void *buf;
int len;
len = new_len + ctx->bufcnt;
pages = get_order(ctx->total);
buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
if (!buf) {
pr_err("Couldn't allocate pages for unaligned cases.\n");
return -ENOMEM;
}
if (ctx->bufcnt)
memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset,
ctx->total - ctx->bufcnt, 0);
sg_init_table(ctx->sgl, 1);
sg_set_buf(ctx->sgl, buf, len);
ctx->sg = ctx->sgl;
set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags);
ctx->sg_len = 1;
ctx->bufcnt = 0;
ctx->offset = 0;
return 0;
}
static int omap_sham_align_sgs(struct scatterlist *sg,
int nbytes, int bs, bool final,
struct omap_sham_reqctx *rctx)
{
int n = 0;
bool aligned = true;
bool list_ok = true;
struct scatterlist *sg_tmp = sg;
int new_len;
int offset = rctx->offset;
if (!sg || !sg->length || !nbytes)
return 0;
new_len = nbytes;
if (offset)
list_ok = false;
if (final)
new_len = DIV_ROUND_UP(new_len, bs) * bs;
else
new_len = new_len / bs * bs;
while (nbytes > 0 && sg_tmp) {
n++;
if (offset < sg_tmp->length) {
if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
aligned = false;
break;
}
if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
aligned = false;
break;
}
}
if (offset) {
offset -= sg_tmp->length;
if (offset < 0) {
nbytes += offset;
offset = 0;
}
} else {
nbytes -= sg_tmp->length;
}
sg_tmp = sg_next(sg_tmp);
if (nbytes < 0) {
list_ok = false;
break;
}
}
if (!aligned)
return omap_sham_copy_sgs(rctx, sg, bs, new_len);
else if (!list_ok)
return omap_sham_copy_sg_lists(rctx, sg, bs, new_len);
rctx->sg_len = n;
rctx->sg = sg;
return 0;
}
static int omap_sham_prepare_request(struct ahash_request *req, bool update)
{
struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
int bs;
int ret;
int nbytes;
bool final = rctx->flags & BIT(FLAGS_FINUP);
int xmit_len, hash_later;
if (!req)
return 0;
bs = get_block_size(rctx);
if (update)
nbytes = req->nbytes;
else
nbytes = 0;
rctx->total = nbytes + rctx->bufcnt;
if (!rctx->total)
return 0;
if (nbytes && (!IS_ALIGNED(rctx->bufcnt, bs))) {
int len = bs - rctx->bufcnt % bs;
if (len > nbytes)
len = nbytes;
scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
0, len, 0);
rctx->bufcnt += len;
nbytes -= len;
rctx->offset = len;
}
if (rctx->bufcnt)
memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);
ret = omap_sham_align_sgs(req->src, nbytes, bs, final, rctx);
if (ret)
return ret;
xmit_len = rctx->total;
if (!IS_ALIGNED(xmit_len, bs)) {
if (final)
xmit_len = DIV_ROUND_UP(xmit_len, bs) * bs;
else
xmit_len = xmit_len / bs * bs;
}
hash_later = rctx->total - xmit_len;
if (hash_later < 0)
hash_later = 0;
if (rctx->bufcnt && nbytes) {
/* have data from previous operation and current */
sg_init_table(rctx->sgl, 2);
sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
sg_chain(rctx->sgl, 2, req->src);
rctx->sg = rctx->sgl;
rctx->sg_len++;
} else if (rctx->bufcnt) {
/* have buffered data only */
sg_init_table(rctx->sgl, 1);
sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, xmit_len);
rctx->sg = rctx->sgl;
rctx->sg_len = 1;
}
if (hash_later) {
if (req->nbytes) {
scatterwalk_map_and_copy(rctx->buffer, req->src,
req->nbytes - hash_later,
hash_later, 0);
} else {
memcpy(rctx->buffer, rctx->buffer + xmit_len,
hash_later);
}
rctx->bufcnt = hash_later;
} else {
rctx->bufcnt = 0;
}
if (!final)
rctx->total = xmit_len;
return 0;
}
static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
clear_bit(FLAGS_DMA_ACTIVE, &dd->flags);
return 0;
}
static int omap_sham_init(struct ahash_request *req)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = NULL, *tmp;
int bs = 0;
spin_lock_bh(&sham.lock);
if (!tctx->dd) {
list_for_each_entry(tmp, &sham.dev_list, list) {
dd = tmp;
break;
}
tctx->dd = dd;
} else {
dd = tctx->dd;
}
spin_unlock_bh(&sham.lock);
ctx->dd = dd;
ctx->flags = 0;
dev_dbg(dd->dev, "init: digest size: %d\n",
crypto_ahash_digestsize(tfm));
switch (crypto_ahash_digestsize(tfm)) {
case MD5_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_MD5;
bs = SHA1_BLOCK_SIZE;
break;
case SHA1_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_SHA1;
bs = SHA1_BLOCK_SIZE;
break;
case SHA224_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_SHA224;
bs = SHA224_BLOCK_SIZE;
break;
case SHA256_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_SHA256;
bs = SHA256_BLOCK_SIZE;
break;
case SHA384_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_SHA384;
bs = SHA384_BLOCK_SIZE;
break;
case SHA512_DIGEST_SIZE:
ctx->flags |= FLAGS_MODE_SHA512;
bs = SHA512_BLOCK_SIZE;
break;
}
ctx->bufcnt = 0;
ctx->digcnt = 0;
ctx->total = 0;
ctx->offset = 0;
ctx->buflen = BUFLEN;
if (tctx->flags & BIT(FLAGS_HMAC)) {
if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
struct omap_sham_hmac_ctx *bctx = tctx->base;
memcpy(ctx->buffer, bctx->ipad, bs);
ctx->bufcnt = bs;
}
ctx->flags |= BIT(FLAGS_HMAC);
}
return 0;
}
static int omap_sham_update_req(struct omap_sham_dev *dd)
{
struct ahash_request *req = dd->req;
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
int err;
bool final = ctx->flags & BIT(FLAGS_FINUP);
dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
if (ctx->total < get_block_size(ctx) ||
ctx->total < OMAP_SHA_DMA_THRESHOLD)
ctx->flags |= BIT(FLAGS_CPU);
if (ctx->flags & BIT(FLAGS_CPU))
err = omap_sham_xmit_cpu(dd, ctx->total, final);
else
err = omap_sham_xmit_dma(dd, ctx->total, final);
/* 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 omap_sham_final_req(struct omap_sham_dev *dd)
{
struct ahash_request *req = dd->req;
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
int err = 0, use_dma = 1;
if ((ctx->total <= get_block_size(ctx)) || dd->polling_mode)
/*
* faster to handle last block with cpu or
* use cpu when dma is not present.
*/
use_dma = 0;
if (use_dma)
err = omap_sham_xmit_dma(dd, ctx->total, 1);
else
err = omap_sham_xmit_cpu(dd, ctx->total, 1);
ctx->bufcnt = 0;
dev_dbg(dd->dev, "final_req: err: %d\n", err);
return err;
}
static int omap_sham_finish_hmac(struct ahash_request *req)
{
struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
struct omap_sham_hmac_ctx *bctx = tctx->base;
int bs = crypto_shash_blocksize(bctx->shash);
int ds = crypto_shash_digestsize(bctx->shash);
SHASH_DESC_ON_STACK(shash, bctx->shash);
shash->tfm = bctx->shash;
shash->flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
return crypto_shash_init(shash) ?:
crypto_shash_update(shash, bctx->opad, bs) ?:
crypto_shash_finup(shash, req->result, ds, req->result);
}
static int omap_sham_finish(struct ahash_request *req)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = ctx->dd;
int err = 0;
if (ctx->digcnt) {
omap_sham_copy_ready_hash(req);
if ((ctx->flags & BIT(FLAGS_HMAC)) &&
!test_bit(FLAGS_AUTO_XOR, &dd->flags))
err = omap_sham_finish_hmac(req);
}
dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
return err;
}
static void omap_sham_finish_req(struct ahash_request *req, int err)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = ctx->dd;
if (test_bit(FLAGS_SGS_COPIED, &dd->flags))
free_pages((unsigned long)sg_virt(ctx->sg),
get_order(ctx->sg->length));
if (test_bit(FLAGS_SGS_ALLOCED, &dd->flags))
kfree(ctx->sg);
ctx->sg = NULL;
dd->flags &= ~(BIT(FLAGS_SGS_ALLOCED) | BIT(FLAGS_SGS_COPIED));
if (!err) {
dd->pdata->copy_hash(req, 1);
if (test_bit(FLAGS_FINAL, &dd->flags))
err = omap_sham_finish(req);
} else {
ctx->flags |= BIT(FLAGS_ERROR);
}
/* atomic operation is not needed here */
dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
pm_runtime_mark_last_busy(dd->dev);
pm_runtime_put_autosuspend(dd->dev);
if (req->base.complete)
req->base.complete(&req->base, err);
}
static int omap_sham_handle_queue(struct omap_sham_dev *dd,
struct ahash_request *req)
{
struct crypto_async_request *async_req, *backlog;
struct omap_sham_reqctx *ctx;
unsigned long flags;
int err = 0, ret = 0;
retry:
spin_lock_irqsave(&dd->lock, flags);
if (req)
ret = ahash_enqueue_request(&dd->queue, req);
if (test_bit(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)
set_bit(FLAGS_BUSY, &dd->flags);
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);
err = omap_sham_prepare_request(req, ctx->op == OP_UPDATE);
if (err)
goto err1;
dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
ctx->op, req->nbytes);
err = omap_sham_hw_init(dd);
if (err)
goto err1;
if (ctx->digcnt)
/* request has changed - restore hash */
dd->pdata->copy_hash(req, 0);
if (ctx->op == OP_UPDATE) {
err = omap_sham_update_req(dd);
if (err != -EINPROGRESS && (ctx->flags & BIT(FLAGS_FINUP)))
/* no final() after finup() */
err = omap_sham_final_req(dd);
} else if (ctx->op == OP_FINAL) {
err = omap_sham_final_req(dd);
}
err1:
dev_dbg(dd->dev, "exit, err: %d\n", err);
if (err != -EINPROGRESS) {
/* done_task will not finish it, so do it here */
omap_sham_finish_req(req, err);
req = NULL;
/*
* Execute next request immediately if there is anything
* in queue.
*/
goto retry;
}
return ret;
}
static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
struct omap_sham_dev *dd = tctx->dd;
ctx->op = op;
return omap_sham_handle_queue(dd, req);
}
static int omap_sham_update(struct ahash_request *req)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
struct omap_sham_dev *dd = ctx->dd;
if (!req->nbytes)
return 0;
if (ctx->total + req->nbytes < ctx->buflen) {
scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
0, req->nbytes, 0);
ctx->bufcnt += req->nbytes;
ctx->total += req->nbytes;
return 0;
}
if (dd->polling_mode)
ctx->flags |= BIT(FLAGS_CPU);
return omap_sham_enqueue(req, OP_UPDATE);
}
static int omap_sham_shash_digest(struct crypto_shash *tfm, u32 flags,
const u8 *data, unsigned int len, u8 *out)
{
SHASH_DESC_ON_STACK(shash, tfm);
shash->tfm = tfm;
shash->flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_shash_digest(shash, data, len, out);
}
static int omap_sham_final_shash(struct ahash_request *req)
{
struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
int offset = 0;
/*
* If we are running HMAC on limited hardware support, skip
* the ipad in the beginning of the buffer if we are going for
* software fallback algorithm.
*/
if (test_bit(FLAGS_HMAC, &ctx->flags) &&
!test_bit(FLAGS_AUTO_XOR, &ctx->dd->flags))
offset = get_block_size(ctx);
return omap_sham_shash_digest(tctx->fallback, req->base.flags,
ctx->buffer + offset,
ctx->bufcnt - offset, req->result);
}
static int omap_sham_final(struct ahash_request *req)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
ctx->flags |= BIT(FLAGS_FINUP);
if (ctx->flags & BIT(FLAGS_ERROR))
return 0; /* uncompleted hash is not needed */
/*
* OMAP HW accel works only with buffers >= 9.
* HMAC is always >= 9 because ipad == block size.
* If buffersize is less than DMA_THRESHOLD, we use fallback
* SW encoding, as using DMA + HW in this case doesn't provide
* any benefit.
*/
if (!ctx->digcnt && ctx->bufcnt < OMAP_SHA_DMA_THRESHOLD)
return omap_sham_final_shash(req);
else if (ctx->bufcnt)
return omap_sham_enqueue(req, OP_FINAL);
/* copy ready hash (+ finalize hmac) */
return omap_sham_finish(req);
}
static int omap_sham_finup(struct ahash_request *req)
{
struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
int err1, err2;
ctx->flags |= BIT(FLAGS_FINUP);
err1 = omap_sham_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 = omap_sham_final(req);
return err1 ?: err2;
}
static int omap_sham_digest(struct ahash_request *req)
{
return omap_sham_init(req) ?: omap_sham_finup(req);
}
static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
struct omap_sham_hmac_ctx *bctx = tctx->base;
int bs = crypto_shash_blocksize(bctx->shash);
int ds = crypto_shash_digestsize(bctx->shash);
struct omap_sham_dev *dd = NULL, *tmp;
int err, i;
spin_lock_bh(&sham.lock);
if (!tctx->dd) {
list_for_each_entry(tmp, &sham.dev_list, list) {
dd = tmp;
break;
}
tctx->dd = dd;
} else {
dd = tctx->dd;
}
spin_unlock_bh(&sham.lock);
err = crypto_shash_setkey(tctx->fallback, key, keylen);
if (err)
return err;
if (keylen > bs) {
err = omap_sham_shash_digest(bctx->shash,
crypto_shash_get_flags(bctx->shash),
key, keylen, bctx->ipad);
if (err)
return err;
keylen = ds;
} else {
memcpy(bctx->ipad, key, keylen);
}
memset(bctx->ipad + keylen, 0, bs - keylen);
if (!test_bit(FLAGS_AUTO_XOR, &dd->flags)) {
memcpy(bctx->opad, bctx->ipad, bs);
for (i = 0; i < bs; i++) {
bctx->ipad[i] ^= 0x36;
bctx->opad[i] ^= 0x5c;
}
}
return err;
}
static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
{
struct omap_sham_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("omap-sham: 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 omap_sham_reqctx) + BUFLEN);
if (alg_base) {
struct omap_sham_hmac_ctx *bctx = tctx->base;
tctx->flags |= BIT(FLAGS_HMAC);
bctx->shash = crypto_alloc_shash(alg_base, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(bctx->shash)) {
pr_err("omap-sham: base driver '%s' "
"could not be loaded.\n", alg_base);
crypto_free_shash(tctx->fallback);
return PTR_ERR(bctx->shash);
}
}
return 0;
}
static int omap_sham_cra_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, NULL);
}
static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "sha1");
}
static int omap_sham_cra_sha224_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "sha224");
}
static int omap_sham_cra_sha256_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "sha256");
}
static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "md5");
}
static int omap_sham_cra_sha384_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "sha384");
}
static int omap_sham_cra_sha512_init(struct crypto_tfm *tfm)
{
return omap_sham_cra_init_alg(tfm, "sha512");
}
static void omap_sham_cra_exit(struct crypto_tfm *tfm)
{
struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
crypto_free_shash(tctx->fallback);
tctx->fallback = NULL;
if (tctx->flags & BIT(FLAGS_HMAC)) {
struct omap_sham_hmac_ctx *bctx = tctx->base;
crypto_free_shash(bctx->shash);
}
}
static int omap_sham_export(struct ahash_request *req, void *out)
{
struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
return 0;
}
static int omap_sham_import(struct ahash_request *req, const void *in)
{
struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
const struct omap_sham_reqctx *ctx_in = in;
memcpy(rctx, in, sizeof(*rctx) + ctx_in->bufcnt);
return 0;
}
static struct ahash_alg algs_sha1_md5[] = {
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = SHA1_DIGEST_SIZE,
.halg.base = {
.cra_name = "sha1",
.cra_driver_name = "omap-sha1",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = MD5_DIGEST_SIZE,
.halg.base = {
.cra_name = "md5",
.cra_driver_name = "omap-md5",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = SHA1_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(sha1)",
.cra_driver_name = "omap-hmac-sha1",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_sha1_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = MD5_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(md5)",
.cra_driver_name = "omap-hmac-md5",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_md5_init,
.cra_exit = omap_sham_cra_exit,
}
}
};
/* OMAP4 has some algs in addition to what OMAP2 has */
static struct ahash_alg algs_sha224_sha256[] = {
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = SHA224_DIGEST_SIZE,
.halg.base = {
.cra_name = "sha224",
.cra_driver_name = "omap-sha224",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = SHA256_DIGEST_SIZE,
.halg.base = {
.cra_name = "sha256",
.cra_driver_name = "omap-sha256",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = SHA224_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(sha224)",
.cra_driver_name = "omap-hmac-sha224",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA224_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_sha224_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = SHA256_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(sha256)",
.cra_driver_name = "omap-hmac-sha256",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_sha256_init,
.cra_exit = omap_sham_cra_exit,
}
},
};
static struct ahash_alg algs_sha384_sha512[] = {
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = SHA384_DIGEST_SIZE,
.halg.base = {
.cra_name = "sha384",
.cra_driver_name = "omap-sha384",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA384_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.halg.digestsize = SHA512_DIGEST_SIZE,
.halg.base = {
.cra_name = "sha512",
.cra_driver_name = "omap-sha512",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = SHA384_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(sha384)",
.cra_driver_name = "omap-hmac-sha384",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA384_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_sha384_init,
.cra_exit = omap_sham_cra_exit,
}
},
{
.init = omap_sham_init,
.update = omap_sham_update,
.final = omap_sham_final,
.finup = omap_sham_finup,
.digest = omap_sham_digest,
.setkey = omap_sham_setkey,
.halg.digestsize = SHA512_DIGEST_SIZE,
.halg.base = {
.cra_name = "hmac(sha512)",
.cra_driver_name = "omap-hmac-sha512",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = SHA512_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct omap_sham_ctx) +
sizeof(struct omap_sham_hmac_ctx),
.cra_alignmask = OMAP_ALIGN_MASK,
.cra_module = THIS_MODULE,
.cra_init = omap_sham_cra_sha512_init,
.cra_exit = omap_sham_cra_exit,
}
},
};
static void omap_sham_done_task(unsigned long data)
{
struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
int err = 0;
if (!test_bit(FLAGS_BUSY, &dd->flags)) {
omap_sham_handle_queue(dd, NULL);
return;
}
if (test_bit(FLAGS_CPU, &dd->flags)) {
if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags))
goto finish;
} else if (test_bit(FLAGS_DMA_READY, &dd->flags)) {
if (test_and_clear_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
omap_sham_update_dma_stop(dd);
if (dd->err) {
err = dd->err;
goto finish;
}
}
if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
/* hash or semi-hash ready */
clear_bit(FLAGS_DMA_READY, &dd->flags);
goto finish;
}
}
return;
finish:
dev_dbg(dd->dev, "update done: err: %d\n", err);
/* finish curent request */
omap_sham_finish_req(dd->req, err);
/* If we are not busy, process next req */
if (!test_bit(FLAGS_BUSY, &dd->flags))
omap_sham_handle_queue(dd, NULL);
}
static irqreturn_t omap_sham_irq_common(struct omap_sham_dev *dd)
{
if (!test_bit(FLAGS_BUSY, &dd->flags)) {
dev_warn(dd->dev, "Interrupt when no active requests.\n");
} else {
set_bit(FLAGS_OUTPUT_READY, &dd->flags);
tasklet_schedule(&dd->done_task);
}
return IRQ_HANDLED;
}
static irqreturn_t omap_sham_irq_omap2(int irq, void *dev_id)
{
struct omap_sham_dev *dd = dev_id;
if (unlikely(test_bit(FLAGS_FINAL, &dd->flags)))
/* final -> allow device to go to power-saving mode */
omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
SHA_REG_CTRL_OUTPUT_READY);
omap_sham_read(dd, SHA_REG_CTRL);
return omap_sham_irq_common(dd);
}
static irqreturn_t omap_sham_irq_omap4(int irq, void *dev_id)
{
struct omap_sham_dev *dd = dev_id;
omap_sham_write_mask(dd, SHA_REG_MASK(dd), 0, SHA_REG_MASK_IT_EN);
return omap_sham_irq_common(dd);
}
static struct omap_sham_algs_info omap_sham_algs_info_omap2[] = {
{
.algs_list = algs_sha1_md5,
.size = ARRAY_SIZE(algs_sha1_md5),
},
};
static const struct omap_sham_pdata omap_sham_pdata_omap2 = {
.algs_info = omap_sham_algs_info_omap2,
.algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap2),
.flags = BIT(FLAGS_BE32_SHA1),
.digest_size = SHA1_DIGEST_SIZE,
.copy_hash = omap_sham_copy_hash_omap2,
.write_ctrl = omap_sham_write_ctrl_omap2,
.trigger = omap_sham_trigger_omap2,
.poll_irq = omap_sham_poll_irq_omap2,
.intr_hdlr = omap_sham_irq_omap2,
.idigest_ofs = 0x00,
.din_ofs = 0x1c,
.digcnt_ofs = 0x14,
.rev_ofs = 0x5c,
.mask_ofs = 0x60,
.sysstatus_ofs = 0x64,
.major_mask = 0xf0,
.major_shift = 4,
.minor_mask = 0x0f,
.minor_shift = 0,
};
#ifdef CONFIG_OF
static struct omap_sham_algs_info omap_sham_algs_info_omap4[] = {
{
.algs_list = algs_sha1_md5,
.size = ARRAY_SIZE(algs_sha1_md5),
},
{
.algs_list = algs_sha224_sha256,
.size = ARRAY_SIZE(algs_sha224_sha256),
},
};
static const struct omap_sham_pdata omap_sham_pdata_omap4 = {
.algs_info = omap_sham_algs_info_omap4,
.algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap4),
.flags = BIT(FLAGS_AUTO_XOR),
.digest_size = SHA256_DIGEST_SIZE,
.copy_hash = omap_sham_copy_hash_omap4,
.write_ctrl = omap_sham_write_ctrl_omap4,
.trigger = omap_sham_trigger_omap4,
.poll_irq = omap_sham_poll_irq_omap4,
.intr_hdlr = omap_sham_irq_omap4,
.idigest_ofs = 0x020,
.odigest_ofs = 0x0,
.din_ofs = 0x080,
.digcnt_ofs = 0x040,
.rev_ofs = 0x100,
.mask_ofs = 0x110,
.sysstatus_ofs = 0x114,
.mode_ofs = 0x44,
.length_ofs = 0x48,
.major_mask = 0x0700,
.major_shift = 8,
.minor_mask = 0x003f,
.minor_shift = 0,
};
static struct omap_sham_algs_info omap_sham_algs_info_omap5[] = {
{
.algs_list = algs_sha1_md5,
.size = ARRAY_SIZE(algs_sha1_md5),
},
{
.algs_list = algs_sha224_sha256,
.size = ARRAY_SIZE(algs_sha224_sha256),
},
{
.algs_list = algs_sha384_sha512,
.size = ARRAY_SIZE(algs_sha384_sha512),
},
};
static const struct omap_sham_pdata omap_sham_pdata_omap5 = {
.algs_info = omap_sham_algs_info_omap5,
.algs_info_size = ARRAY_SIZE(omap_sham_algs_info_omap5),
.flags = BIT(FLAGS_AUTO_XOR),
.digest_size = SHA512_DIGEST_SIZE,
.copy_hash = omap_sham_copy_hash_omap4,
.write_ctrl = omap_sham_write_ctrl_omap4,
.trigger = omap_sham_trigger_omap4,
.poll_irq = omap_sham_poll_irq_omap4,
.intr_hdlr = omap_sham_irq_omap4,
.idigest_ofs = 0x240,
.odigest_ofs = 0x200,
.din_ofs = 0x080,
.digcnt_ofs = 0x280,
.rev_ofs = 0x100,
.mask_ofs = 0x110,
.sysstatus_ofs = 0x114,
.mode_ofs = 0x284,
.length_ofs = 0x288,
.major_mask = 0x0700,
.major_shift = 8,
.minor_mask = 0x003f,
.minor_shift = 0,
};
static const struct of_device_id omap_sham_of_match[] = {
{
.compatible = "ti,omap2-sham",
.data = &omap_sham_pdata_omap2,
},
{
.compatible = "ti,omap3-sham",
.data = &omap_sham_pdata_omap2,
},
{
.compatible = "ti,omap4-sham",
.data = &omap_sham_pdata_omap4,
},
{
.compatible = "ti,omap5-sham",
.data = &omap_sham_pdata_omap5,
},
{},
};
MODULE_DEVICE_TABLE(of, omap_sham_of_match);
static int omap_sham_get_res_of(struct omap_sham_dev *dd,
struct device *dev, struct resource *res)
{
struct device_node *node = dev->of_node;
const struct of_device_id *match;
int err = 0;
match = of_match_device(of_match_ptr(omap_sham_of_match), dev);
if (!match) {
dev_err(dev, "no compatible OF match\n");
err = -EINVAL;
goto err;
}
err = of_address_to_resource(node, 0, res);
if (err < 0) {
dev_err(dev, "can't translate OF node address\n");
err = -EINVAL;
goto err;
}
dd->irq = irq_of_parse_and_map(node, 0);
if (!dd->irq) {
dev_err(dev, "can't translate OF irq value\n");
err = -EINVAL;
goto err;
}
dd->pdata = match->data;
err:
return err;
}
#else
static const struct of_device_id omap_sham_of_match[] = {
{},
};
static int omap_sham_get_res_of(struct omap_sham_dev *dd,
struct device *dev, struct resource *res)
{
return -EINVAL;
}
#endif
static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
struct platform_device *pdev, struct resource *res)
{
struct device *dev = &pdev->dev;
struct resource *r;
int err = 0;
/* Get the base address */
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(dev, "no MEM resource info\n");
err = -ENODEV;
goto err;
}
memcpy(res, r, sizeof(*res));
/* Get the IRQ */
dd->irq = platform_get_irq(pdev, 0);
if (dd->irq < 0) {
dev_err(dev, "no IRQ resource info\n");
err = dd->irq;
goto err;
}
/* Only OMAP2/3 can be non-DT */
dd->pdata = &omap_sham_pdata_omap2;
err:
return err;
}
static int omap_sham_probe(struct platform_device *pdev)
{
struct omap_sham_dev *dd;
struct device *dev = &pdev->dev;
struct resource res;
dma_cap_mask_t mask;
int err, i, j;
u32 rev;
dd = devm_kzalloc(dev, sizeof(struct omap_sham_dev), GFP_KERNEL);
if (dd == NULL) {
dev_err(dev, "unable to alloc data struct.\n");
err = -ENOMEM;
goto data_err;
}
dd->dev = dev;
platform_set_drvdata(pdev, dd);
INIT_LIST_HEAD(&dd->list);
spin_lock_init(&dd->lock);
tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
err = (dev->of_node) ? omap_sham_get_res_of(dd, dev, &res) :
omap_sham_get_res_pdev(dd, pdev, &res);
if (err)
goto data_err;
dd->io_base = devm_ioremap_resource(dev, &res);
if (IS_ERR(dd->io_base)) {
err = PTR_ERR(dd->io_base);
goto data_err;
}
dd->phys_base = res.start;
err = devm_request_irq(dev, dd->irq, dd->pdata->intr_hdlr,
IRQF_TRIGGER_NONE, dev_name(dev), dd);
if (err) {
dev_err(dev, "unable to request irq %d, err = %d\n",
dd->irq, err);
goto data_err;
}
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dd->dma_lch = dma_request_chan(dev, "rx");
if (IS_ERR(dd->dma_lch)) {
err = PTR_ERR(dd->dma_lch);
if (err == -EPROBE_DEFER)
goto data_err;
dd->polling_mode = 1;
dev_dbg(dev, "using polling mode instead of dma\n");
}
dd->flags |= dd->pdata->flags;
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
pm_runtime_enable(dev);
pm_runtime_irq_safe(dev);
err = pm_runtime_get_sync(dev);
if (err < 0) {
dev_err(dev, "failed to get sync: %d\n", err);
goto err_pm;
}
rev = omap_sham_read(dd, SHA_REG_REV(dd));
pm_runtime_put_sync(&pdev->dev);
dev_info(dev, "hw accel on OMAP rev %u.%u\n",
(rev & dd->pdata->major_mask) >> dd->pdata->major_shift,
(rev & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
spin_lock(&sham.lock);
list_add_tail(&dd->list, &sham.dev_list);
spin_unlock(&sham.lock);
for (i = 0; i < dd->pdata->algs_info_size; i++) {
for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
struct ahash_alg *alg;
alg = &dd->pdata->algs_info[i].algs_list[j];
alg->export = omap_sham_export;
alg->import = omap_sham_import;
alg->halg.statesize = sizeof(struct omap_sham_reqctx) +
BUFLEN;
err = crypto_register_ahash(alg);
if (err)
goto err_algs;
dd->pdata->algs_info[i].registered++;
}
}
return 0;
err_algs:
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_ahash(
&dd->pdata->algs_info[i].algs_list[j]);
err_pm:
pm_runtime_disable(dev);
if (!dd->polling_mode)
dma_release_channel(dd->dma_lch);
data_err:
dev_err(dev, "initialization failed.\n");
return err;
}
static int omap_sham_remove(struct platform_device *pdev)
{
static struct omap_sham_dev *dd;
int i, j;
dd = platform_get_drvdata(pdev);
if (!dd)
return -ENODEV;
spin_lock(&sham.lock);
list_del(&dd->list);
spin_unlock(&sham.lock);
for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_ahash(
&dd->pdata->algs_info[i].algs_list[j]);
tasklet_kill(&dd->done_task);
pm_runtime_disable(&pdev->dev);
if (!dd->polling_mode)
dma_release_channel(dd->dma_lch);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int omap_sham_suspend(struct device *dev)
{
pm_runtime_put_sync(dev);
return 0;
}
static int omap_sham_resume(struct device *dev)
{
int err = pm_runtime_get_sync(dev);
if (err < 0) {
dev_err(dev, "failed to get sync: %d\n", err);
return err;
}
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(omap_sham_pm_ops, omap_sham_suspend, omap_sham_resume);
static struct platform_driver omap_sham_driver = {
.probe = omap_sham_probe,
.remove = omap_sham_remove,
.driver = {
.name = "omap-sham",
.pm = &omap_sham_pm_ops,
.of_match_table = omap_sham_of_match,
},
};
module_platform_driver(omap_sham_driver);
MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Dmitry Kasatkin");
MODULE_ALIAS("platform:omap-sham");
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