// SPDX-License-Identifier: GPL-2.0-or-later
/*
* sun4i-ss-cipher.c - hardware cryptographic accelerator for Allwinner A20 SoC
*
* Copyright (C) 2013-2015 Corentin LABBE <[email protected]>
*
* This file add support for AES cipher with 128,192,256 bits
* keysize in CBC and ECB mode.
* Add support also for DES and 3DES in CBC and ECB mode.
*
* You could find the datasheet in Documentation/arch/arm/sunxi.rst
*/
#include "sun4i-ss.h"
static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_ss_ctx *ss = op->ss;
unsigned int ivsize = crypto_skcipher_ivsize(tfm);
struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
u32 mode = ctx->mode;
/* when activating SS, the default FIFO space is SS_RX_DEFAULT(32) */
u32 rx_cnt = SS_RX_DEFAULT;
u32 tx_cnt = 0;
u32 spaces;
u32 v;
int err = 0;
unsigned int i;
unsigned int ileft = areq->cryptlen;
unsigned int oleft = areq->cryptlen;
unsigned int todo;
unsigned long pi = 0, po = 0; /* progress for in and out */
bool miter_err;
struct sg_mapping_iter mi, mo;
unsigned int oi, oo; /* offset for in and out */
unsigned long flags;
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct sun4i_ss_alg_template *algt;
if (!areq->cryptlen)
return 0;
if (!areq->src || !areq->dst) {
dev_err_ratelimited(ss->dev, "ERROR: Some SGs are NULL\n");
return -EINVAL;
}
if (areq->iv && ivsize > 0 && mode & SS_DECRYPTION) {
scatterwalk_map_and_copy(ctx->backup_iv, areq->src,
areq->cryptlen - ivsize, ivsize, 0);
}
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
algt->stat_opti++;
algt->stat_bytes += areq->cryptlen;
}
spin_lock_irqsave(&ss->slock, flags);
for (i = 0; i < op->keylen / 4; i++)
writesl(ss->base + SS_KEY0 + i * 4, &op->key[i], 1);
if (areq->iv) {
for (i = 0; i < 4 && i < ivsize / 4; i++) {
v = *(u32 *)(areq->iv + i * 4);
writesl(ss->base + SS_IV0 + i * 4, &v, 1);
}
}
writel(mode, ss->base + SS_CTL);
ileft = areq->cryptlen / 4;
oleft = areq->cryptlen / 4;
oi = 0;
oo = 0;
do {
if (ileft) {
sg_miter_start(&mi, areq->src, sg_nents(areq->src),
SG_MITER_FROM_SG | SG_MITER_ATOMIC);
if (pi)
sg_miter_skip(&mi, pi);
miter_err = sg_miter_next(&mi);
if (!miter_err || !mi.addr) {
dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
err = -EINVAL;
goto release_ss;
}
todo = min(rx_cnt, ileft);
todo = min_t(size_t, todo, (mi.length - oi) / 4);
if (todo) {
ileft -= todo;
writesl(ss->base + SS_RXFIFO, mi.addr + oi, todo);
oi += todo * 4;
}
if (oi == mi.length) {
pi += mi.length;
oi = 0;
}
sg_miter_stop(&mi);
}
spaces = readl(ss->base + SS_FCSR);
rx_cnt = SS_RXFIFO_SPACES(spaces);
tx_cnt = SS_TXFIFO_SPACES(spaces);
sg_miter_start(&mo, areq->dst, sg_nents(areq->dst),
SG_MITER_TO_SG | SG_MITER_ATOMIC);
if (po)
sg_miter_skip(&mo, po);
miter_err = sg_miter_next(&mo);
if (!miter_err || !mo.addr) {
dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
err = -EINVAL;
goto release_ss;
}
todo = min(tx_cnt, oleft);
todo = min_t(size_t, todo, (mo.length - oo) / 4);
if (todo) {
oleft -= todo;
readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo);
oo += todo * 4;
}
if (oo == mo.length) {
oo = 0;
po += mo.length;
}
sg_miter_stop(&mo);
} while (oleft);
if (areq->iv) {
if (mode & SS_DECRYPTION) {
memcpy(areq->iv, ctx->backup_iv, ivsize);
memzero_explicit(ctx->backup_iv, ivsize);
} else {
scatterwalk_map_and_copy(areq->iv, areq->dst, areq->cryptlen - ivsize,
ivsize, 0);
}
}
release_ss:
writel(0, ss->base + SS_CTL);
spin_unlock_irqrestore(&ss->slock, flags);
return err;
}
static int noinline_for_stack sun4i_ss_cipher_poll_fallback(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
int err;
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct sun4i_ss_alg_template *algt;
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
algt->stat_fb++;
}
skcipher_request_set_tfm(&ctx->fallback_req, op->fallback_tfm);
skcipher_request_set_callback(&ctx->fallback_req, areq->base.flags,
areq->base.complete, areq->base.data);
skcipher_request_set_crypt(&ctx->fallback_req, areq->src, areq->dst,
areq->cryptlen, areq->iv);
if (ctx->mode & SS_DECRYPTION)
err = crypto_skcipher_decrypt(&ctx->fallback_req);
else
err = crypto_skcipher_encrypt(&ctx->fallback_req);
return err;
}
/* Generic function that support SG with size not multiple of 4 */
static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_ss_ctx *ss = op->ss;
int no_chunk = 1;
struct scatterlist *in_sg = areq->src;
struct scatterlist *out_sg = areq->dst;
unsigned int ivsize = crypto_skcipher_ivsize(tfm);
struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct sun4i_ss_alg_template *algt;
u32 mode = ctx->mode;
/* when activating SS, the default FIFO space is SS_RX_DEFAULT(32) */
u32 rx_cnt = SS_RX_DEFAULT;
u32 tx_cnt = 0;
u32 v;
u32 spaces;
int err = 0;
unsigned int i;
unsigned int ileft = areq->cryptlen;
unsigned int oleft = areq->cryptlen;
unsigned int todo;
struct sg_mapping_iter mi, mo;
unsigned long pi = 0, po = 0; /* progress for in and out */
bool miter_err;
unsigned int oi, oo; /* offset for in and out */
unsigned int ob = 0; /* offset in buf */
unsigned int obo = 0; /* offset in bufo*/
unsigned int obl = 0; /* length of data in bufo */
unsigned long flags;
bool need_fallback = false;
if (!areq->cryptlen)
return 0;
if (!areq->src || !areq->dst) {
dev_err_ratelimited(ss->dev, "ERROR: Some SGs are NULL\n");
return -EINVAL;
}
algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
if (areq->cryptlen % algt->alg.crypto.base.cra_blocksize)
need_fallback = true;
/*
* if we have only SGs with size multiple of 4,
* we can use the SS optimized function
*/
while (in_sg && no_chunk == 1) {
if ((in_sg->length | in_sg->offset) & 3u)
no_chunk = 0;
in_sg = sg_next(in_sg);
}
while (out_sg && no_chunk == 1) {
if ((out_sg->length | out_sg->offset) & 3u)
no_chunk = 0;
out_sg = sg_next(out_sg);
}
if (no_chunk == 1 && !need_fallback)
return sun4i_ss_opti_poll(areq);
if (need_fallback)
return sun4i_ss_cipher_poll_fallback(areq);
if (areq->iv && ivsize > 0 && mode & SS_DECRYPTION) {
scatterwalk_map_and_copy(ctx->backup_iv, areq->src,
areq->cryptlen - ivsize, ivsize, 0);
}
if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {
algt->stat_req++;
algt->stat_bytes += areq->cryptlen;
}
spin_lock_irqsave(&ss->slock, flags);
for (i = 0; i < op->keylen / 4; i++)
writesl(ss->base + SS_KEY0 + i * 4, &op->key[i], 1);
if (areq->iv) {
for (i = 0; i < 4 && i < ivsize / 4; i++) {
v = *(u32 *)(areq->iv + i * 4);
writesl(ss->base + SS_IV0 + i * 4, &v, 1);
}
}
writel(mode, ss->base + SS_CTL);
ileft = areq->cryptlen;
oleft = areq->cryptlen;
oi = 0;
oo = 0;
while (oleft) {
if (ileft) {
sg_miter_start(&mi, areq->src, sg_nents(areq->src),
SG_MITER_FROM_SG | SG_MITER_ATOMIC);
if (pi)
sg_miter_skip(&mi, pi);
miter_err = sg_miter_next(&mi);
if (!miter_err || !mi.addr) {
dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
err = -EINVAL;
goto release_ss;
}
/*
* todo is the number of consecutive 4byte word that we
* can read from current SG
*/
todo = min(rx_cnt, ileft / 4);
todo = min_t(size_t, todo, (mi.length - oi) / 4);
if (todo && !ob) {
writesl(ss->base + SS_RXFIFO, mi.addr + oi,
todo);
ileft -= todo * 4;
oi += todo * 4;
} else {
/*
* not enough consecutive bytes, so we need to
* linearize in buf. todo is in bytes
* After that copy, if we have a multiple of 4
* we need to be able to write all buf in one
* pass, so it is why we min() with rx_cnt
*/
todo = min(rx_cnt * 4 - ob, ileft);
todo = min_t(size_t, todo, mi.length - oi);
memcpy(ss->buf + ob, mi.addr + oi, todo);
ileft -= todo;
oi += todo;
ob += todo;
if (!(ob % 4)) {
writesl(ss->base + SS_RXFIFO, ss->buf,
ob / 4);
ob = 0;
}
}
if (oi == mi.length) {
pi += mi.length;
oi = 0;
}
sg_miter_stop(&mi);
}
spaces = readl(ss->base + SS_FCSR);
rx_cnt = SS_RXFIFO_SPACES(spaces);
tx_cnt = SS_TXFIFO_SPACES(spaces);
if (!tx_cnt)
continue;
sg_miter_start(&mo, areq->dst, sg_nents(areq->dst),
SG_MITER_TO_SG | SG_MITER_ATOMIC);
if (po)
sg_miter_skip(&mo, po);
miter_err = sg_miter_next(&mo);
if (!miter_err || !mo.addr) {
dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
err = -EINVAL;
goto release_ss;
}
/* todo in 4bytes word */
todo = min(tx_cnt, oleft / 4);
todo = min_t(size_t, todo, (mo.length - oo) / 4);
if (todo) {
readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo);
oleft -= todo * 4;
oo += todo * 4;
if (oo == mo.length) {
po += mo.length;
oo = 0;
}
} else {
/*
* read obl bytes in bufo, we read at maximum for
* emptying the device
*/
readsl(ss->base + SS_TXFIFO, ss->bufo, tx_cnt);
obl = tx_cnt * 4;
obo = 0;
do {
/*
* how many bytes we can copy ?
* no more than remaining SG size
* no more than remaining buffer
* no need to test against oleft
*/
todo = min_t(size_t,
mo.length - oo, obl - obo);
memcpy(mo.addr + oo, ss->bufo + obo, todo);
oleft -= todo;
obo += todo;
oo += todo;
if (oo == mo.length) {
po += mo.length;
sg_miter_next(&mo);
oo = 0;
}
} while (obo < obl);
/* bufo must be fully used here */
}
sg_miter_stop(&mo);
}
if (areq->iv) {
if (mode & SS_DECRYPTION) {
memcpy(areq->iv, ctx->backup_iv, ivsize);
memzero_explicit(ctx->backup_iv, ivsize);
} else {
scatterwalk_map_and_copy(areq->iv, areq->dst, areq->cryptlen - ivsize,
ivsize, 0);
}
}
release_ss:
writel(0, ss->base + SS_CTL);
spin_unlock_irqrestore(&ss->slock, flags);
return err;
}
/* CBC AES */
int sun4i_ss_cbc_aes_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_AES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_cbc_aes_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_AES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
/* ECB AES */
int sun4i_ss_ecb_aes_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_AES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_ecb_aes_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_AES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
/* CBC DES */
int sun4i_ss_cbc_des_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_DES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_cbc_des_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_DES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
/* ECB DES */
int sun4i_ss_ecb_des_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_DES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_ecb_des_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_DES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
/* CBC 3DES */
int sun4i_ss_cbc_des3_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_3DES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_cbc_des3_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_3DES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
/* ECB 3DES */
int sun4i_ss_ecb_des3_encrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_3DES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_ecb_des3_decrypt(struct skcipher_request *areq)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
rctx->mode = SS_OP_3DES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
op->keymode;
return sun4i_ss_cipher_poll(areq);
}
int sun4i_ss_cipher_init(struct crypto_tfm *tfm)
{
struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
struct sun4i_ss_alg_template *algt;
const char *name = crypto_tfm_alg_name(tfm);
int err;
memset(op, 0, sizeof(struct sun4i_tfm_ctx));
algt = container_of(tfm->__crt_alg, struct sun4i_ss_alg_template,
alg.crypto.base);
op->ss = algt->ss;
op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback_tfm)) {
dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
name, PTR_ERR(op->fallback_tfm));
return PTR_ERR(op->fallback_tfm);
}
crypto_skcipher_set_reqsize(__crypto_skcipher_cast(tfm),
sizeof(struct sun4i_cipher_req_ctx) +
crypto_skcipher_reqsize(op->fallback_tfm));
err = pm_runtime_resume_and_get(op->ss->dev);
if (err < 0)
goto error_pm;
return 0;
error_pm:
crypto_free_skcipher(op->fallback_tfm);
return err;
}
void sun4i_ss_cipher_exit(struct crypto_tfm *tfm)
{
struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
crypto_free_skcipher(op->fallback_tfm);
pm_runtime_put(op->ss->dev);
}
/* check and set the AES key, prepare the mode to be used */
int sun4i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
struct sun4i_ss_ctx *ss = op->ss;
switch (keylen) {
case 128 / 8:
op->keymode = SS_AES_128BITS;
break;
case 192 / 8:
op->keymode = SS_AES_192BITS;
break;
case 256 / 8:
op->keymode = SS_AES_256BITS;
break;
default:
dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen);
return -EINVAL;
}
op->keylen = keylen;
memcpy(op->key, key, keylen);
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}
/* check and set the DES key, prepare the mode to be used */
int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
int err;
err = verify_skcipher_des_key(tfm, key);
if (err)
return err;
op->keylen = keylen;
memcpy(op->key, key, keylen);
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}
/* check and set the 3DES key, prepare the mode to be used */
int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
int err;
err = verify_skcipher_des3_key(tfm, key);
if (err)
return err;
op->keylen = keylen;
memcpy(op->key, key, keylen);
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
}
Codebase Browser
linux