Commit 9e054ec2 authored by Fabien DESSENNE's avatar Fabien DESSENNE Committed by Herbert Xu

crypto: stm32 - Support for STM32 CRYP crypto module

This module registers block cipher algorithms that make use of the
STMicroelectronics STM32 crypto "CRYP1" hardware.
The following algorithms are supported:
- aes: ecb, cbc, ctr
- des: ecb, cbc
- tdes: ecb, cbc
Signed-off-by: default avatarFabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent f82f59cf
......@@ -18,3 +18,12 @@ config HASH_DEV_STM32
help
This enables support for the HASH hw accelerator which can be found
on STMicroelectronics STM32 SOC.
config CRYP_DEV_STM32
tristate "Support for STM32 cryp accelerators"
depends on ARCH_STM32
select CRYPTO_HASH
select CRYPTO_ENGINE
help
This enables support for the CRYP (AES/DES/TDES) hw accelerator which
can be found on STMicroelectronics STM32 SOC.
obj-$(CONFIG_CRC_DEV_STM32) += stm32_crc32.o
obj-$(CONFIG_HASH_DEV_STM32) += stm32-hash.o
obj-$(CONFIG_CRYP_DEV_STM32) += stm32-cryp.o
/*
* Copyright (C) STMicroelectronics SA 2017
* Author: Fabien Dessenne <fabien.dessenne@st.com>
* License terms: GNU General Public License (GPL), version 2
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/engine.h>
#include <crypto/scatterwalk.h>
#define DRIVER_NAME "stm32-cryp"
/* Bit [0] encrypt / decrypt */
#define FLG_ENCRYPT BIT(0)
/* Bit [8..1] algo & operation mode */
#define FLG_AES BIT(1)
#define FLG_DES BIT(2)
#define FLG_TDES BIT(3)
#define FLG_ECB BIT(4)
#define FLG_CBC BIT(5)
#define FLG_CTR BIT(6)
/* Mode mask = bits [15..0] */
#define FLG_MODE_MASK GENMASK(15, 0)
/* Registers */
#define CRYP_CR 0x00000000
#define CRYP_SR 0x00000004
#define CRYP_DIN 0x00000008
#define CRYP_DOUT 0x0000000C
#define CRYP_DMACR 0x00000010
#define CRYP_IMSCR 0x00000014
#define CRYP_RISR 0x00000018
#define CRYP_MISR 0x0000001C
#define CRYP_K0LR 0x00000020
#define CRYP_K0RR 0x00000024
#define CRYP_K1LR 0x00000028
#define CRYP_K1RR 0x0000002C
#define CRYP_K2LR 0x00000030
#define CRYP_K2RR 0x00000034
#define CRYP_K3LR 0x00000038
#define CRYP_K3RR 0x0000003C
#define CRYP_IV0LR 0x00000040
#define CRYP_IV0RR 0x00000044
#define CRYP_IV1LR 0x00000048
#define CRYP_IV1RR 0x0000004C
/* Registers values */
#define CR_DEC_NOT_ENC 0x00000004
#define CR_TDES_ECB 0x00000000
#define CR_TDES_CBC 0x00000008
#define CR_DES_ECB 0x00000010
#define CR_DES_CBC 0x00000018
#define CR_AES_ECB 0x00000020
#define CR_AES_CBC 0x00000028
#define CR_AES_CTR 0x00000030
#define CR_AES_KP 0x00000038
#define CR_AES_UNKNOWN 0xFFFFFFFF
#define CR_ALGO_MASK 0x00080038
#define CR_DATA32 0x00000000
#define CR_DATA16 0x00000040
#define CR_DATA8 0x00000080
#define CR_DATA1 0x000000C0
#define CR_KEY128 0x00000000
#define CR_KEY192 0x00000100
#define CR_KEY256 0x00000200
#define CR_FFLUSH 0x00004000
#define CR_CRYPEN 0x00008000
#define SR_BUSY 0x00000010
#define SR_OFNE 0x00000004
#define IMSCR_IN BIT(0)
#define IMSCR_OUT BIT(1)
#define MISR_IN BIT(0)
#define MISR_OUT BIT(1)
/* Misc */
#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32))
#define _walked_in (cryp->in_walk.offset - cryp->in_sg->offset)
#define _walked_out (cryp->out_walk.offset - cryp->out_sg->offset)
struct stm32_cryp_ctx {
struct stm32_cryp *cryp;
int keylen;
u32 key[AES_KEYSIZE_256 / sizeof(u32)];
unsigned long flags;
};
struct stm32_cryp_reqctx {
unsigned long mode;
};
struct stm32_cryp {
struct list_head list;
struct device *dev;
void __iomem *regs;
struct clk *clk;
unsigned long flags;
u32 irq_status;
struct stm32_cryp_ctx *ctx;
struct crypto_engine *engine;
struct mutex lock; /* protects req */
struct ablkcipher_request *req;
size_t hw_blocksize;
size_t total_in;
size_t total_in_save;
size_t total_out;
size_t total_out_save;
struct scatterlist *in_sg;
struct scatterlist *out_sg;
struct scatterlist *out_sg_save;
struct scatterlist in_sgl;
struct scatterlist out_sgl;
bool sgs_copied;
int in_sg_len;
int out_sg_len;
struct scatter_walk in_walk;
struct scatter_walk out_walk;
u32 last_ctr[4];
};
struct stm32_cryp_list {
struct list_head dev_list;
spinlock_t lock; /* protect dev_list */
};
static struct stm32_cryp_list cryp_list = {
.dev_list = LIST_HEAD_INIT(cryp_list.dev_list),
.lock = __SPIN_LOCK_UNLOCKED(cryp_list.lock),
};
static inline bool is_aes(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_AES;
}
static inline bool is_des(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_DES;
}
static inline bool is_tdes(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_TDES;
}
static inline bool is_ecb(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_ECB;
}
static inline bool is_cbc(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_CBC;
}
static inline bool is_ctr(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_CTR;
}
static inline bool is_encrypt(struct stm32_cryp *cryp)
{
return cryp->flags & FLG_ENCRYPT;
}
static inline bool is_decrypt(struct stm32_cryp *cryp)
{
return !is_encrypt(cryp);
}
static inline u32 stm32_cryp_read(struct stm32_cryp *cryp, u32 ofst)
{
return readl_relaxed(cryp->regs + ofst);
}
static inline void stm32_cryp_write(struct stm32_cryp *cryp, u32 ofst, u32 val)
{
writel_relaxed(val, cryp->regs + ofst);
}
static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp)
{
u32 status;
return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
!(status & SR_BUSY), 10, 100000);
}
static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx)
{
struct stm32_cryp *tmp, *cryp = NULL;
spin_lock_bh(&cryp_list.lock);
if (!ctx->cryp) {
list_for_each_entry(tmp, &cryp_list.dev_list, list) {
cryp = tmp;
break;
}
ctx->cryp = cryp;
} else {
cryp = ctx->cryp;
}
spin_unlock_bh(&cryp_list.lock);
return cryp;
}
static int stm32_cryp_check_aligned(struct scatterlist *sg, size_t total,
size_t align)
{
int len = 0;
if (!total)
return 0;
if (!IS_ALIGNED(total, align))
return -EINVAL;
while (sg) {
if (!IS_ALIGNED(sg->offset, sizeof(u32)))
return -EINVAL;
if (!IS_ALIGNED(sg->length, align))
return -EINVAL;
len += sg->length;
sg = sg_next(sg);
}
if (len != total)
return -EINVAL;
return 0;
}
static int stm32_cryp_check_io_aligned(struct stm32_cryp *cryp)
{
int ret;
ret = stm32_cryp_check_aligned(cryp->in_sg, cryp->total_in,
cryp->hw_blocksize);
if (ret)
return ret;
ret = stm32_cryp_check_aligned(cryp->out_sg, cryp->total_out,
cryp->hw_blocksize);
return ret;
}
static void sg_copy_buf(void *buf, struct scatterlist *sg,
unsigned int start, unsigned int nbytes, int out)
{
struct scatter_walk walk;
if (!nbytes)
return;
scatterwalk_start(&walk, sg);
scatterwalk_advance(&walk, start);
scatterwalk_copychunks(buf, &walk, nbytes, out);
scatterwalk_done(&walk, out, 0);
}
static int stm32_cryp_copy_sgs(struct stm32_cryp *cryp)
{
void *buf_in, *buf_out;
int pages, total_in, total_out;
if (!stm32_cryp_check_io_aligned(cryp)) {
cryp->sgs_copied = 0;
return 0;
}
total_in = ALIGN(cryp->total_in, cryp->hw_blocksize);
pages = total_in ? get_order(total_in) : 1;
buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
total_out = ALIGN(cryp->total_out, cryp->hw_blocksize);
pages = total_out ? get_order(total_out) : 1;
buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
if (!buf_in || !buf_out) {
dev_err(cryp->dev, "Can't allocate pages when unaligned\n");
cryp->sgs_copied = 0;
return -EFAULT;
}
sg_copy_buf(buf_in, cryp->in_sg, 0, cryp->total_in, 0);
sg_init_one(&cryp->in_sgl, buf_in, total_in);
cryp->in_sg = &cryp->in_sgl;
cryp->in_sg_len = 1;
sg_init_one(&cryp->out_sgl, buf_out, total_out);
cryp->out_sg_save = cryp->out_sg;
cryp->out_sg = &cryp->out_sgl;
cryp->out_sg_len = 1;
cryp->sgs_copied = 1;
return 0;
}
static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, u32 *iv)
{
if (!iv)
return;
stm32_cryp_write(cryp, CRYP_IV0LR, cpu_to_be32(*iv++));
stm32_cryp_write(cryp, CRYP_IV0RR, cpu_to_be32(*iv++));
if (is_aes(cryp)) {
stm32_cryp_write(cryp, CRYP_IV1LR, cpu_to_be32(*iv++));
stm32_cryp_write(cryp, CRYP_IV1RR, cpu_to_be32(*iv++));
}
}
static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
{
unsigned int i;
int r_id;
if (is_des(c)) {
stm32_cryp_write(c, CRYP_K1LR, cpu_to_be32(c->ctx->key[0]));
stm32_cryp_write(c, CRYP_K1RR, cpu_to_be32(c->ctx->key[1]));
} else {
r_id = CRYP_K3RR;
for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
stm32_cryp_write(c, r_id,
cpu_to_be32(c->ctx->key[i - 1]));
}
}
static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
{
if (is_aes(cryp) && is_ecb(cryp))
return CR_AES_ECB;
if (is_aes(cryp) && is_cbc(cryp))
return CR_AES_CBC;
if (is_aes(cryp) && is_ctr(cryp))
return CR_AES_CTR;
if (is_des(cryp) && is_ecb(cryp))
return CR_DES_ECB;
if (is_des(cryp) && is_cbc(cryp))
return CR_DES_CBC;
if (is_tdes(cryp) && is_ecb(cryp))
return CR_TDES_ECB;
if (is_tdes(cryp) && is_cbc(cryp))
return CR_TDES_CBC;
dev_err(cryp->dev, "Unknown mode\n");
return CR_AES_UNKNOWN;
}
static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
{
int ret;
u32 cfg, hw_mode;
/* Disable interrupt */
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
/* Set key */
stm32_cryp_hw_write_key(cryp);
/* Set configuration */
cfg = CR_DATA8 | CR_FFLUSH;
switch (cryp->ctx->keylen) {
case AES_KEYSIZE_128:
cfg |= CR_KEY128;
break;
case AES_KEYSIZE_192:
cfg |= CR_KEY192;
break;
default:
case AES_KEYSIZE_256:
cfg |= CR_KEY256;
break;
}
hw_mode = stm32_cryp_get_hw_mode(cryp);
if (hw_mode == CR_AES_UNKNOWN)
return -EINVAL;
/* AES ECB/CBC decrypt: run key preparation first */
if (is_decrypt(cryp) &&
((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) {
stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP | CR_CRYPEN);
/* Wait for end of processing */
ret = stm32_cryp_wait_busy(cryp);
if (ret) {
dev_err(cryp->dev, "Timeout (key preparation)\n");
return ret;
}
}
cfg |= hw_mode;
if (is_decrypt(cryp))
cfg |= CR_DEC_NOT_ENC;
/* Apply config and flush (valid when CRYPEN = 0) */
stm32_cryp_write(cryp, CRYP_CR, cfg);
switch (hw_mode) {
case CR_DES_CBC:
case CR_TDES_CBC:
case CR_AES_CBC:
case CR_AES_CTR:
stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->req->info);
break;
default:
break;
}
/* Enable now */
cfg |= CR_CRYPEN;
stm32_cryp_write(cryp, CRYP_CR, cfg);
return 0;
}
static void stm32_cryp_finish_req(struct stm32_cryp *cryp)
{
int err = 0;
if (cryp->sgs_copied) {
void *buf_in, *buf_out;
int pages, len;
buf_in = sg_virt(&cryp->in_sgl);
buf_out = sg_virt(&cryp->out_sgl);
sg_copy_buf(buf_out, cryp->out_sg_save, 0,
cryp->total_out_save, 1);
len = ALIGN(cryp->total_in_save, cryp->hw_blocksize);
pages = len ? get_order(len) : 1;
free_pages((unsigned long)buf_in, pages);
len = ALIGN(cryp->total_out_save, cryp->hw_blocksize);
pages = len ? get_order(len) : 1;
free_pages((unsigned long)buf_out, pages);
}
crypto_finalize_cipher_request(cryp->engine, cryp->req, err);
cryp->req = NULL;
memset(cryp->ctx->key, 0, cryp->ctx->keylen);
mutex_unlock(&cryp->lock);
}
static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
{
/* Enable interrupt and let the IRQ handler do everything */
stm32_cryp_write(cryp, CRYP_IMSCR, IMSCR_IN | IMSCR_OUT);
return 0;
}
static int stm32_cryp_cra_init(struct crypto_tfm *tfm)
{
tfm->crt_ablkcipher.reqsize = sizeof(struct stm32_cryp_reqctx);
return 0;
}
static int stm32_cryp_crypt(struct ablkcipher_request *req, unsigned long mode)
{
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct stm32_cryp_reqctx *rctx = ablkcipher_request_ctx(req);
struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
if (!cryp)
return -ENODEV;
rctx->mode = mode;
return crypto_transfer_cipher_request_to_engine(cryp->engine, req);
}
static int stm32_cryp_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
memcpy(ctx->key, key, keylen);
ctx->keylen = keylen;
return 0;
}
static int stm32_cryp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
keylen != AES_KEYSIZE_256)
return -EINVAL;
else
return stm32_cryp_setkey(tfm, key, keylen);
}
static int stm32_cryp_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
if (keylen != DES_KEY_SIZE)
return -EINVAL;
else
return stm32_cryp_setkey(tfm, key, keylen);
}
static int stm32_cryp_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
if (keylen != (3 * DES_KEY_SIZE))
return -EINVAL;
else
return stm32_cryp_setkey(tfm, key, keylen);
}
static int stm32_cryp_aes_ecb_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT);
}
static int stm32_cryp_aes_ecb_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_ECB);
}
static int stm32_cryp_aes_cbc_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_CBC | FLG_ENCRYPT);
}
static int stm32_cryp_aes_cbc_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_CBC);
}
static int stm32_cryp_aes_ctr_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_CTR | FLG_ENCRYPT);
}
static int stm32_cryp_aes_ctr_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_AES | FLG_CTR);
}
static int stm32_cryp_des_ecb_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT);
}
static int stm32_cryp_des_ecb_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_DES | FLG_ECB);
}
static int stm32_cryp_des_cbc_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_DES | FLG_CBC | FLG_ENCRYPT);
}
static int stm32_cryp_des_cbc_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_DES | FLG_CBC);
}
static int stm32_cryp_tdes_ecb_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB | FLG_ENCRYPT);
}
static int stm32_cryp_tdes_ecb_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB);
}
static int stm32_cryp_tdes_cbc_encrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC | FLG_ENCRYPT);
}
static int stm32_cryp_tdes_cbc_decrypt(struct ablkcipher_request *req)
{
return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC);
}
static int stm32_cryp_prepare_req(struct crypto_engine *engine,
struct ablkcipher_request *req)
{
struct stm32_cryp_ctx *ctx;
struct stm32_cryp *cryp;
struct stm32_cryp_reqctx *rctx;
int ret;
if (!req)
return -EINVAL;
ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
cryp = ctx->cryp;
if (!cryp)
return -ENODEV;
mutex_lock(&cryp->lock);
rctx = ablkcipher_request_ctx(req);
rctx->mode &= FLG_MODE_MASK;
ctx->cryp = cryp;
cryp->flags = (cryp->flags & ~FLG_MODE_MASK) | rctx->mode;
cryp->hw_blocksize = is_aes(cryp) ? AES_BLOCK_SIZE : DES_BLOCK_SIZE;
cryp->ctx = ctx;
cryp->req = req;
cryp->total_in = req->nbytes;
cryp->total_out = cryp->total_in;
cryp->total_in_save = cryp->total_in;
cryp->total_out_save = cryp->total_out;
cryp->in_sg = req->src;
cryp->out_sg = req->dst;
cryp->out_sg_save = cryp->out_sg;
cryp->in_sg_len = sg_nents_for_len(cryp->in_sg, cryp->total_in);
if (cryp->in_sg_len < 0) {
dev_err(cryp->dev, "Cannot get in_sg_len\n");
ret = cryp->in_sg_len;
goto out;
}
cryp->out_sg_len = sg_nents_for_len(cryp->out_sg, cryp->total_out);
if (cryp->out_sg_len < 0) {
dev_err(cryp->dev, "Cannot get out_sg_len\n");
ret = cryp->out_sg_len;
goto out;
}
ret = stm32_cryp_copy_sgs(cryp);
if (ret)
goto out;
scatterwalk_start(&cryp->in_walk, cryp->in_sg);
scatterwalk_start(&cryp->out_walk, cryp->out_sg);
ret = stm32_cryp_hw_init(cryp);
out:
if (ret)
mutex_unlock(&cryp->lock);
return ret;
}
static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
struct ablkcipher_request *req)
{
return stm32_cryp_prepare_req(engine, req);
}
static int stm32_cryp_cipher_one_req(struct crypto_engine *engine,
struct ablkcipher_request *req)
{
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct stm32_cryp *cryp = ctx->cryp;
if (!cryp)
return -ENODEV;
return stm32_cryp_cpu_start(cryp);
}
static u32 *stm32_cryp_next_out(struct stm32_cryp *cryp, u32 *dst,
unsigned int n)
{
scatterwalk_advance(&cryp->out_walk, n);
if (unlikely(cryp->out_sg->length == _walked_out)) {
cryp->out_sg = sg_next(cryp->out_sg);
if (cryp->out_sg) {
scatterwalk_start(&cryp->out_walk, cryp->out_sg);
return (sg_virt(cryp->out_sg) + _walked_out);
}
}
return (u32 *)((u8 *)dst + n);
}
static u32 *stm32_cryp_next_in(struct stm32_cryp *cryp, u32 *src,
unsigned int n)
{
scatterwalk_advance(&cryp->in_walk, n);
if (unlikely(cryp->in_sg->length == _walked_in)) {
cryp->in_sg = sg_next(cryp->in_sg);
if (cryp->in_sg) {
scatterwalk_start(&cryp->in_walk, cryp->in_sg);
return (sg_virt(cryp->in_sg) + _walked_in);
}
}
return (u32 *)((u8 *)src + n);
}
static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
{
u32 cr;
if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) {
cryp->last_ctr[3] = 0;
cryp->last_ctr[2]++;
if (!cryp->last_ctr[2]) {
cryp->last_ctr[1]++;
if (!cryp->last_ctr[1])
cryp->last_ctr[0]++;
}
cr = stm32_cryp_read(cryp, CRYP_CR);
stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN);
stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->last_ctr);
stm32_cryp_write(cryp, CRYP_CR, cr);
}
cryp->last_ctr[0] = stm32_cryp_read(cryp, CRYP_IV0LR);
cryp->last_ctr[1] = stm32_cryp_read(cryp, CRYP_IV0RR);
cryp->last_ctr[2] = stm32_cryp_read(cryp, CRYP_IV1LR);
cryp->last_ctr[3] = stm32_cryp_read(cryp, CRYP_IV1RR);
}
static bool stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
{
unsigned int i, j;
u32 d32, *dst;
u8 *d8;
dst = sg_virt(cryp->out_sg) + _walked_out;
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
if (likely(cryp->total_out >= sizeof(u32))) {
/* Read a full u32 */
*dst = stm32_cryp_read(cryp, CRYP_DOUT);
dst = stm32_cryp_next_out(cryp, dst, sizeof(u32));
cryp->total_out -= sizeof(u32);
} else if (!cryp->total_out) {
/* Empty fifo out (data from input padding) */
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
} else {
/* Read less than an u32 */
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
d8 = (u8 *)&d32;
for (j = 0; j < cryp->total_out; j++) {
*((u8 *)dst) = *(d8++);
dst = stm32_cryp_next_out(cryp, dst, 1);
}
cryp->total_out = 0;
}
}
return !cryp->total_out || !cryp->total_in;
}
static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
{
unsigned int i, j;
u32 *src;
u8 d8[4];
src = sg_virt(cryp->in_sg) + _walked_in;
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
if (likely(cryp->total_in >= sizeof(u32))) {
/* Write a full u32 */
stm32_cryp_write(cryp, CRYP_DIN, *src);
src = stm32_cryp_next_in(cryp, src, sizeof(u32));
cryp->total_in -= sizeof(u32);
} else if (!cryp->total_in) {
/* Write padding data */
stm32_cryp_write(cryp, CRYP_DIN, 0);
} else {
/* Write less than an u32 */
memset(d8, 0, sizeof(u32));
for (j = 0; j < cryp->total_in; j++) {
d8[j] = *((u8 *)src);
src = stm32_cryp_next_in(cryp, src, 1);
}
stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
cryp->total_in = 0;
}
}
}
static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
{
if (unlikely(!cryp->total_in)) {
dev_warn(cryp->dev, "No more data to process\n");
return;
}
if (is_aes(cryp) && is_ctr(cryp))
stm32_cryp_check_ctr_counter(cryp);
stm32_cryp_irq_write_block(cryp);
}
static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
{
struct stm32_cryp *cryp = arg;
if (cryp->irq_status & MISR_OUT)
/* Output FIFO IRQ: read data */
if (unlikely(stm32_cryp_irq_read_data(cryp))) {
/* All bytes processed, finish */
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
stm32_cryp_finish_req(cryp);
return IRQ_HANDLED;
}
if (cryp->irq_status & MISR_IN) {
/* Input FIFO IRQ: write data */
stm32_cryp_irq_write_data(cryp);
}
return IRQ_HANDLED;
}
static irqreturn_t stm32_cryp_irq(int irq, void *arg)
{
struct stm32_cryp *cryp = arg;
cryp->irq_status = stm32_cryp_read(cryp, CRYP_MISR);
return IRQ_WAKE_THREAD;
}
static struct crypto_alg crypto_algs[] = {
{
.cra_name = "ecb(aes)",
.cra_driver_name = "stm32-ecb-aes",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = stm32_cryp_aes_setkey,
.encrypt = stm32_cryp_aes_ecb_encrypt,
.decrypt = stm32_cryp_aes_ecb_decrypt,
}
},
{
.cra_name = "cbc(aes)",
.cra_driver_name = "stm32-cbc-aes",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = stm32_cryp_aes_setkey,
.encrypt = stm32_cryp_aes_cbc_encrypt,
.decrypt = stm32_cryp_aes_cbc_decrypt,
}
},
{
.cra_name = "ctr(aes)",
.cra_driver_name = "stm32-ctr-aes",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = stm32_cryp_aes_setkey,
.encrypt = stm32_cryp_aes_ctr_encrypt,
.decrypt = stm32_cryp_aes_ctr_decrypt,
}
},
{
.cra_name = "ecb(des)",
.cra_driver_name = "stm32-ecb-des",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = DES_BLOCK_SIZE,
.max_keysize = DES_BLOCK_SIZE,
.setkey = stm32_cryp_des_setkey,
.encrypt = stm32_cryp_des_ecb_encrypt,
.decrypt = stm32_cryp_des_ecb_decrypt,
}
},
{
.cra_name = "cbc(des)",
.cra_driver_name = "stm32-cbc-des",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = DES_BLOCK_SIZE,
.max_keysize = DES_BLOCK_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = stm32_cryp_des_setkey,
.encrypt = stm32_cryp_des_cbc_encrypt,
.decrypt = stm32_cryp_des_cbc_decrypt,
}
},
{
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "stm32-ecb-des3",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = 3 * DES_BLOCK_SIZE,
.max_keysize = 3 * DES_BLOCK_SIZE,
.setkey = stm32_cryp_tdes_setkey,
.encrypt = stm32_cryp_tdes_ecb_encrypt,
.decrypt = stm32_cryp_tdes_ecb_decrypt,
}
},
{
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "stm32-cbc-des3",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
.cra_alignmask = 0xf,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = stm32_cryp_cra_init,
.cra_ablkcipher = {
.min_keysize = 3 * DES_BLOCK_SIZE,
.max_keysize = 3 * DES_BLOCK_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = stm32_cryp_tdes_setkey,
.encrypt = stm32_cryp_tdes_cbc_encrypt,
.decrypt = stm32_cryp_tdes_cbc_decrypt,
}
},
};
static const struct of_device_id stm32_dt_ids[] = {
{ .compatible = "st,stm32f756-cryp", },
{},
};
MODULE_DEVICE_TABLE(of, sti_dt_ids);
static int stm32_cryp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct stm32_cryp *cryp;
struct resource *res;
struct reset_control *rst;
int irq, ret;
cryp = devm_kzalloc(dev, sizeof(*cryp), GFP_KERNEL);
if (!cryp)
return -ENOMEM;
cryp->dev = dev;
mutex_init(&cryp->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
cryp->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(cryp->regs)) {
dev_err(dev, "Cannot map CRYP IO\n");
return PTR_ERR(cryp->regs);
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "Cannot get IRQ resource\n");
return irq;
}
ret = devm_request_threaded_irq(dev, irq, stm32_cryp_irq,
stm32_cryp_irq_thread, IRQF_ONESHOT,
dev_name(dev), cryp);
if (ret) {
dev_err(dev, "Cannot grab IRQ\n");
return ret;
}
cryp->clk = devm_clk_get(dev, NULL);
if (IS_ERR(cryp->clk)) {
dev_err(dev, "Could not get clock\n");
return PTR_ERR(cryp->clk);
}
ret = clk_prepare_enable(cryp->clk);
if (ret) {
dev_err(cryp->dev, "Failed to enable clock\n");
return ret;
}
rst = devm_reset_control_get(dev, NULL);
if (!IS_ERR(rst)) {
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
}
platform_set_drvdata(pdev, cryp);
spin_lock(&cryp_list.lock);
list_add(&cryp->list, &cryp_list.dev_list);
spin_unlock(&cryp_list.lock);
/* Initialize crypto engine */
cryp->engine = crypto_engine_alloc_init(dev, 1);
if (!cryp->engine) {
dev_err(dev, "Could not init crypto engine\n");
ret = -ENOMEM;
goto err_engine1;
}
cryp->engine->prepare_cipher_request = stm32_cryp_prepare_cipher_req;
cryp->engine->cipher_one_request = stm32_cryp_cipher_one_req;
ret = crypto_engine_start(cryp->engine);
if (ret) {
dev_err(dev, "Could not start crypto engine\n");
goto err_engine2;
}
ret = crypto_register_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
if (ret) {
dev_err(dev, "Could not register algs\n");
goto err_algs;
}
dev_info(dev, "Initialized\n");
return 0;
err_algs:
err_engine2:
crypto_engine_exit(cryp->engine);
err_engine1:
spin_lock(&cryp_list.lock);
list_del(&cryp->list);
spin_unlock(&cryp_list.lock);
clk_disable_unprepare(cryp->clk);
return ret;
}
static int stm32_cryp_remove(struct platform_device *pdev)
{
struct stm32_cryp *cryp = platform_get_drvdata(pdev);
if (!cryp)
return -ENODEV;
crypto_unregister_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
crypto_engine_exit(cryp->engine);
spin_lock(&cryp_list.lock);
list_del(&cryp->list);
spin_unlock(&cryp_list.lock);
clk_disable_unprepare(cryp->clk);
return 0;
}
static struct platform_driver stm32_cryp_driver = {
.probe = stm32_cryp_probe,
.remove = stm32_cryp_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = stm32_dt_ids,
},
};
module_platform_driver(stm32_cryp_driver);
MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
MODULE_DESCRIPTION("STMicrolectronics STM32 CRYP hardware driver");
MODULE_LICENSE("GPL");
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