diff options
Diffstat (limited to 'drivers/crypto/stm32/stm32-hash.c')
| -rw-r--r-- | drivers/crypto/stm32/stm32-hash.c | 1575 |
1 files changed, 1575 insertions, 0 deletions
diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c new file mode 100644 index 000000000000..b585ce54a802 --- /dev/null +++ b/drivers/crypto/stm32/stm32-hash.c @@ -0,0 +1,1575 @@ +/* + * This file is part of STM32 Crypto driver for Linux. + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Lionel DEBIEVE <[email protected]> for STMicroelectronics. + * + * License terms: GPL V2.0. + * + * 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. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <linux/clk.h> +#include <linux/crypto.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reset.h> + +#include <crypto/engine.h> +#include <crypto/hash.h> +#include <crypto/md5.h> +#include <crypto/scatterwalk.h> +#include <crypto/sha.h> +#include <crypto/internal/hash.h> + +#define HASH_CR 0x00 +#define HASH_DIN 0x04 +#define HASH_STR 0x08 +#define HASH_IMR 0x20 +#define HASH_SR 0x24 +#define HASH_CSR(x) (0x0F8 + ((x) * 0x04)) +#define HASH_HREG(x) (0x310 + ((x) * 0x04)) +#define HASH_HWCFGR 0x3F0 +#define HASH_VER 0x3F4 +#define HASH_ID 0x3F8 + +/* Control Register */ +#define HASH_CR_INIT BIT(2) +#define HASH_CR_DMAE BIT(3) +#define HASH_CR_DATATYPE_POS 4 +#define HASH_CR_MODE BIT(6) +#define HASH_CR_MDMAT BIT(13) +#define HASH_CR_DMAA BIT(14) +#define HASH_CR_LKEY BIT(16) + +#define HASH_CR_ALGO_SHA1 0x0 +#define HASH_CR_ALGO_MD5 0x80 +#define HASH_CR_ALGO_SHA224 0x40000 +#define HASH_CR_ALGO_SHA256 0x40080 + +/* Interrupt */ +#define HASH_DINIE BIT(0) +#define HASH_DCIE BIT(1) + +/* Interrupt Mask */ +#define HASH_MASK_CALC_COMPLETION BIT(0) +#define HASH_MASK_DATA_INPUT BIT(1) + +/* Context swap register */ +#define HASH_CSR_REGISTER_NUMBER 53 + +/* Status Flags */ +#define HASH_SR_DATA_INPUT_READY BIT(0) +#define HASH_SR_OUTPUT_READY BIT(1) +#define HASH_SR_DMA_ACTIVE BIT(2) +#define HASH_SR_BUSY BIT(3) + +/* STR Register */ +#define HASH_STR_NBLW_MASK GENMASK(4, 0) +#define HASH_STR_DCAL BIT(8) + +#define HASH_FLAGS_INIT BIT(0) +#define HASH_FLAGS_OUTPUT_READY BIT(1) +#define HASH_FLAGS_CPU BIT(2) +#define HASH_FLAGS_DMA_READY BIT(3) +#define HASH_FLAGS_DMA_ACTIVE BIT(4) +#define HASH_FLAGS_HMAC_INIT BIT(5) +#define HASH_FLAGS_HMAC_FINAL BIT(6) +#define HASH_FLAGS_HMAC_KEY BIT(7) + +#define HASH_FLAGS_FINAL BIT(15) +#define HASH_FLAGS_FINUP BIT(16) +#define HASH_FLAGS_ALGO_MASK GENMASK(21, 18) +#define HASH_FLAGS_MD5 BIT(18) +#define HASH_FLAGS_SHA1 BIT(19) +#define HASH_FLAGS_SHA224 BIT(20) +#define HASH_FLAGS_SHA256 BIT(21) +#define HASH_FLAGS_ERRORS BIT(22) +#define HASH_FLAGS_HMAC BIT(23) + +#define HASH_OP_UPDATE 1 +#define HASH_OP_FINAL 2 + +enum stm32_hash_data_format { + HASH_DATA_32_BITS = 0x0, + HASH_DATA_16_BITS = 0x1, + HASH_DATA_8_BITS = 0x2, + HASH_DATA_1_BIT = 0x3 +}; + +#define HASH_BUFLEN 256 +#define HASH_LONG_KEY 64 +#define HASH_MAX_KEY_SIZE (SHA256_BLOCK_SIZE * 8) +#define HASH_QUEUE_LENGTH 16 +#define HASH_DMA_THRESHOLD 50 + +struct stm32_hash_ctx { + struct stm32_hash_dev *hdev; + unsigned long flags; + + u8 key[HASH_MAX_KEY_SIZE]; + int keylen; +}; + +struct stm32_hash_request_ctx { + struct stm32_hash_dev *hdev; + unsigned long flags; + unsigned long op; + + u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32)); + size_t digcnt; + size_t bufcnt; + size_t buflen; + + /* DMA */ + struct scatterlist *sg; + unsigned int offset; + unsigned int total; + struct scatterlist sg_key; + + dma_addr_t dma_addr; + size_t dma_ct; + int nents; + + u8 data_type; + + u8 buffer[HASH_BUFLEN] __aligned(sizeof(u32)); + + /* Export Context */ + u32 *hw_context; +}; + +struct stm32_hash_algs_info { + struct ahash_alg *algs_list; + size_t size; +}; + +struct stm32_hash_pdata { + struct stm32_hash_algs_info *algs_info; + size_t algs_info_size; +}; + +struct stm32_hash_dev { + struct list_head list; + struct device *dev; + struct clk *clk; + struct reset_control *rst; + void __iomem *io_base; + phys_addr_t phys_base; + u32 dma_mode; + u32 dma_maxburst; + + spinlock_t lock; /* lock to protect queue */ + + struct ahash_request *req; + struct crypto_engine *engine; + + int err; + unsigned long flags; + + struct dma_chan *dma_lch; + struct completion dma_completion; + + const struct stm32_hash_pdata *pdata; +}; + +struct stm32_hash_drv { + struct list_head dev_list; + spinlock_t lock; /* List protection access */ +}; + +static struct stm32_hash_drv stm32_hash = { + .dev_list = LIST_HEAD_INIT(stm32_hash.dev_list), + .lock = __SPIN_LOCK_UNLOCKED(stm32_hash.lock), +}; + +static void stm32_hash_dma_callback(void *param); + +static inline u32 stm32_hash_read(struct stm32_hash_dev *hdev, u32 offset) +{ + return readl_relaxed(hdev->io_base + offset); +} + +static inline void stm32_hash_write(struct stm32_hash_dev *hdev, + u32 offset, u32 value) +{ + writel_relaxed(value, hdev->io_base + offset); +} + +static inline int stm32_hash_wait_busy(struct stm32_hash_dev *hdev) +{ + u32 status; + + return readl_relaxed_poll_timeout(hdev->io_base + HASH_SR, status, + !(status & HASH_SR_BUSY), 10, 10000); +} + +static void stm32_hash_set_nblw(struct stm32_hash_dev *hdev, int length) +{ + u32 reg; + + reg = stm32_hash_read(hdev, HASH_STR); + reg &= ~(HASH_STR_NBLW_MASK); + reg |= (8U * ((length) % 4U)); + stm32_hash_write(hdev, HASH_STR, reg); +} + +static int stm32_hash_write_key(struct stm32_hash_dev *hdev) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(hdev->req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(tfm); + u32 reg; + int keylen = ctx->keylen; + void *key = ctx->key; + + if (keylen) { + stm32_hash_set_nblw(hdev, keylen); + + while (keylen > 0) { + stm32_hash_write(hdev, HASH_DIN, *(u32 *)key); + keylen -= 4; + key += 4; + } + + reg = stm32_hash_read(hdev, HASH_STR); + reg |= HASH_STR_DCAL; + stm32_hash_write(hdev, HASH_STR, reg); + + return -EINPROGRESS; + } + + return 0; +} + +static void stm32_hash_write_ctrl(struct stm32_hash_dev *hdev) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(hdev->req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(hdev->req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(tfm); + + u32 reg = HASH_CR_INIT; + + if (!(hdev->flags & HASH_FLAGS_INIT)) { + switch (rctx->flags & HASH_FLAGS_ALGO_MASK) { + case HASH_FLAGS_MD5: + reg |= HASH_CR_ALGO_MD5; + break; + case HASH_FLAGS_SHA1: + reg |= HASH_CR_ALGO_SHA1; + break; + case HASH_FLAGS_SHA224: + reg |= HASH_CR_ALGO_SHA224; + break; + case HASH_FLAGS_SHA256: + reg |= HASH_CR_ALGO_SHA256; + break; + default: + reg |= HASH_CR_ALGO_MD5; + } + + reg |= (rctx->data_type << HASH_CR_DATATYPE_POS); + + if (rctx->flags & HASH_FLAGS_HMAC) { + hdev->flags |= HASH_FLAGS_HMAC; + reg |= HASH_CR_MODE; + if (ctx->keylen > HASH_LONG_KEY) + reg |= HASH_CR_LKEY; + } + + stm32_hash_write(hdev, HASH_IMR, HASH_DCIE); + + stm32_hash_write(hdev, HASH_CR, reg); + + hdev->flags |= HASH_FLAGS_INIT; + + dev_dbg(hdev->dev, "Write Control %x\n", reg); + } +} + +static void stm32_hash_append_sg(struct stm32_hash_request_ctx *rctx) +{ + size_t count; + + while ((rctx->bufcnt < rctx->buflen) && rctx->total) { + count = min(rctx->sg->length - rctx->offset, rctx->total); + count = min(count, rctx->buflen - rctx->bufcnt); + + if (count <= 0) { + if ((rctx->sg->length == 0) && !sg_is_last(rctx->sg)) { + rctx->sg = sg_next(rctx->sg); + continue; + } else { + break; + } + } + + scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, rctx->sg, + rctx->offset, count, 0); + + rctx->bufcnt += count; + rctx->offset += count; + rctx->total -= count; + + if (rctx->offset == rctx->sg->length) { + rctx->sg = sg_next(rctx->sg); + if (rctx->sg) + rctx->offset = 0; + else + rctx->total = 0; + } + } +} + +static int stm32_hash_xmit_cpu(struct stm32_hash_dev *hdev, + const u8 *buf, size_t length, int final) +{ + unsigned int count, len32; + const u32 *buffer = (const u32 *)buf; + u32 reg; + + if (final) + hdev->flags |= HASH_FLAGS_FINAL; + + len32 = DIV_ROUND_UP(length, sizeof(u32)); + + dev_dbg(hdev->dev, "%s: length: %d, final: %x len32 %i\n", + __func__, length, final, len32); + + hdev->flags |= HASH_FLAGS_CPU; + + stm32_hash_write_ctrl(hdev); + + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + + if ((hdev->flags & HASH_FLAGS_HMAC) && + (hdev->flags & ~HASH_FLAGS_HMAC_KEY)) { + hdev->flags |= HASH_FLAGS_HMAC_KEY; + stm32_hash_write_key(hdev); + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + } + + for (count = 0; count < len32; count++) + stm32_hash_write(hdev, HASH_DIN, buffer[count]); + + if (final) { + stm32_hash_set_nblw(hdev, length); + reg = stm32_hash_read(hdev, HASH_STR); + reg |= HASH_STR_DCAL; + stm32_hash_write(hdev, HASH_STR, reg); + if (hdev->flags & HASH_FLAGS_HMAC) { + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + stm32_hash_write_key(hdev); + } + return -EINPROGRESS; + } + + return 0; +} + +static int stm32_hash_update_cpu(struct stm32_hash_dev *hdev) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(hdev->req); + int bufcnt, err = 0, final; + + dev_dbg(hdev->dev, "%s flags %lx\n", __func__, rctx->flags); + + final = (rctx->flags & HASH_FLAGS_FINUP); + + while ((rctx->total >= rctx->buflen) || + (rctx->bufcnt + rctx->total >= rctx->buflen)) { + stm32_hash_append_sg(rctx); + bufcnt = rctx->bufcnt; + rctx->bufcnt = 0; + err = stm32_hash_xmit_cpu(hdev, rctx->buffer, bufcnt, 0); + } + + stm32_hash_append_sg(rctx); + + if (final) { + bufcnt = rctx->bufcnt; + rctx->bufcnt = 0; + err = stm32_hash_xmit_cpu(hdev, rctx->buffer, bufcnt, + (rctx->flags & HASH_FLAGS_FINUP)); + } + + return err; +} + +static int stm32_hash_xmit_dma(struct stm32_hash_dev *hdev, + struct scatterlist *sg, int length, int mdma) +{ + struct dma_async_tx_descriptor *in_desc; + dma_cookie_t cookie; + u32 reg; + int err; + + in_desc = dmaengine_prep_slave_sg(hdev->dma_lch, sg, 1, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + if (!in_desc) { + dev_err(hdev->dev, "dmaengine_prep_slave error\n"); + return -ENOMEM; + } + + reinit_completion(&hdev->dma_completion); + in_desc->callback = stm32_hash_dma_callback; + in_desc->callback_param = hdev; + + hdev->flags |= HASH_FLAGS_FINAL; + hdev->flags |= HASH_FLAGS_DMA_ACTIVE; + + reg = stm32_hash_read(hdev, HASH_CR); + + if (mdma) + reg |= HASH_CR_MDMAT; + else + reg &= ~HASH_CR_MDMAT; + + reg |= HASH_CR_DMAE; + + stm32_hash_write(hdev, HASH_CR, reg); + + stm32_hash_set_nblw(hdev, length); + + cookie = dmaengine_submit(in_desc); + err = dma_submit_error(cookie); + if (err) + return -ENOMEM; + + dma_async_issue_pending(hdev->dma_lch); + + if (!wait_for_completion_interruptible_timeout(&hdev->dma_completion, + msecs_to_jiffies(100))) + err = -ETIMEDOUT; + + if (dma_async_is_tx_complete(hdev->dma_lch, cookie, + NULL, NULL) != DMA_COMPLETE) + err = -ETIMEDOUT; + + if (err) { + dev_err(hdev->dev, "DMA Error %i\n", err); + dmaengine_terminate_all(hdev->dma_lch); + return err; + } + + return -EINPROGRESS; +} + +static void stm32_hash_dma_callback(void *param) +{ + struct stm32_hash_dev *hdev = param; + + complete(&hdev->dma_completion); + + hdev->flags |= HASH_FLAGS_DMA_READY; +} + +static int stm32_hash_hmac_dma_send(struct stm32_hash_dev *hdev) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(hdev->req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(hdev->req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(tfm); + int err; + + if (ctx->keylen < HASH_DMA_THRESHOLD || (hdev->dma_mode == 1)) { + err = stm32_hash_write_key(hdev); + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + } else { + if (!(hdev->flags & HASH_FLAGS_HMAC_KEY)) + sg_init_one(&rctx->sg_key, ctx->key, + ALIGN(ctx->keylen, sizeof(u32))); + + rctx->dma_ct = dma_map_sg(hdev->dev, &rctx->sg_key, 1, + DMA_TO_DEVICE); + if (rctx->dma_ct == 0) { + dev_err(hdev->dev, "dma_map_sg error\n"); + return -ENOMEM; + } + + err = stm32_hash_xmit_dma(hdev, &rctx->sg_key, ctx->keylen, 0); + + dma_unmap_sg(hdev->dev, &rctx->sg_key, 1, DMA_TO_DEVICE); + } + + return err; +} + +static int stm32_hash_dma_init(struct stm32_hash_dev *hdev) +{ + struct dma_slave_config dma_conf; + int err; + + memset(&dma_conf, 0, sizeof(dma_conf)); + + dma_conf.direction = DMA_MEM_TO_DEV; + dma_conf.dst_addr = hdev->phys_base + HASH_DIN; + dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_conf.src_maxburst = hdev->dma_maxburst; + dma_conf.dst_maxburst = hdev->dma_maxburst; + dma_conf.device_fc = false; + + hdev->dma_lch = dma_request_slave_channel(hdev->dev, "in"); + if (!hdev->dma_lch) { + dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n"); + return -EBUSY; + } + + err = dmaengine_slave_config(hdev->dma_lch, &dma_conf); + if (err) { + dma_release_channel(hdev->dma_lch); + hdev->dma_lch = NULL; + dev_err(hdev->dev, "Couldn't configure DMA slave.\n"); + return err; + } + + init_completion(&hdev->dma_completion); + + return 0; +} + +static int stm32_hash_dma_send(struct stm32_hash_dev *hdev) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(hdev->req); + struct scatterlist sg[1], *tsg; + int err = 0, len = 0, reg, ncp; + unsigned int i; + const u32 *buffer = (const u32 *)rctx->buffer; + + rctx->sg = hdev->req->src; + rctx->total = hdev->req->nbytes; + + rctx->nents = sg_nents(rctx->sg); + + if (rctx->nents < 0) + return -EINVAL; + + stm32_hash_write_ctrl(hdev); + + if (hdev->flags & HASH_FLAGS_HMAC) { + err = stm32_hash_hmac_dma_send(hdev); + if (err != -EINPROGRESS) + return err; + } + + for_each_sg(rctx->sg, tsg, rctx->nents, i) { + len = sg->length; + + sg[0] = *tsg; + if (sg_is_last(sg)) { + if (hdev->dma_mode == 1) { + len = (ALIGN(sg->length, 16) - 16); + + ncp = sg_pcopy_to_buffer( + rctx->sg, rctx->nents, + rctx->buffer, sg->length - len, + rctx->total - sg->length + len); + + sg->length = len; + } else { + if (!(IS_ALIGNED(sg->length, sizeof(u32)))) { + len = sg->length; + sg->length = ALIGN(sg->length, + sizeof(u32)); + } + } + } + + rctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, + DMA_TO_DEVICE); + if (rctx->dma_ct == 0) { + dev_err(hdev->dev, "dma_map_sg error\n"); + return -ENOMEM; + } + + err = stm32_hash_xmit_dma(hdev, sg, len, + !sg_is_last(sg)); + + dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE); + + if (err == -ENOMEM) + return err; + } + + if (hdev->dma_mode == 1) { + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + reg = stm32_hash_read(hdev, HASH_CR); + reg &= ~HASH_CR_DMAE; + reg |= HASH_CR_DMAA; + stm32_hash_write(hdev, HASH_CR, reg); + + for (i = 0; i < DIV_ROUND_UP(ncp, sizeof(u32)); i++) + stm32_hash_write(hdev, HASH_DIN, buffer[i]); + + stm32_hash_set_nblw(hdev, ncp); + reg = stm32_hash_read(hdev, HASH_STR); + reg |= HASH_STR_DCAL; + stm32_hash_write(hdev, HASH_STR, reg); + err = -EINPROGRESS; + } + + if (hdev->flags & HASH_FLAGS_HMAC) { + if (stm32_hash_wait_busy(hdev)) + return -ETIMEDOUT; + err = stm32_hash_hmac_dma_send(hdev); + } + + return err; +} + +static struct stm32_hash_dev *stm32_hash_find_dev(struct stm32_hash_ctx *ctx) +{ + struct stm32_hash_dev *hdev = NULL, *tmp; + + spin_lock_bh(&stm32_hash.lock); + if (!ctx->hdev) { + list_for_each_entry(tmp, &stm32_hash.dev_list, list) { + hdev = tmp; + break; + } + ctx->hdev = hdev; + } else { + hdev = ctx->hdev; + } + + spin_unlock_bh(&stm32_hash.lock); + + return hdev; +} + +static bool stm32_hash_dma_aligned_data(struct ahash_request *req) +{ + struct scatterlist *sg; + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + int i; + + if (req->nbytes <= HASH_DMA_THRESHOLD) + return false; + + if (sg_nents(req->src) > 1) { + if (hdev->dma_mode == 1) + return false; + for_each_sg(req->src, sg, sg_nents(req->src), i) { + if ((!IS_ALIGNED(sg->length, sizeof(u32))) && + (!sg_is_last(sg))) + return false; + } + } + + if (req->src->offset % 4) + return false; + + return true; +} + +static int stm32_hash_init(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(tfm); + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + + rctx->hdev = hdev; + + rctx->flags = HASH_FLAGS_CPU; + + rctx->digcnt = crypto_ahash_digestsize(tfm); + switch (rctx->digcnt) { + case MD5_DIGEST_SIZE: + rctx->flags |= HASH_FLAGS_MD5; + break; + case SHA1_DIGEST_SIZE: + rctx->flags |= HASH_FLAGS_SHA1; + break; + case SHA224_DIGEST_SIZE: + rctx->flags |= HASH_FLAGS_SHA224; + break; + case SHA256_DIGEST_SIZE: + rctx->flags |= HASH_FLAGS_SHA256; + break; + default: + return -EINVAL; + } + + rctx->bufcnt = 0; + rctx->buflen = HASH_BUFLEN; + rctx->total = 0; + rctx->offset = 0; + rctx->data_type = HASH_DATA_8_BITS; + + memset(rctx->buffer, 0, HASH_BUFLEN); + + if (ctx->flags & HASH_FLAGS_HMAC) + rctx->flags |= HASH_FLAGS_HMAC; + + dev_dbg(hdev->dev, "%s Flags %lx\n", __func__, rctx->flags); + + return 0; +} + +static int stm32_hash_update_req(struct stm32_hash_dev *hdev) +{ + return stm32_hash_update_cpu(hdev); +} + +static int stm32_hash_final_req(struct stm32_hash_dev *hdev) +{ + struct ahash_request *req = hdev->req; + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + int err; + + if (!(rctx->flags & HASH_FLAGS_CPU)) + err = stm32_hash_dma_send(hdev); + else + err = stm32_hash_xmit_cpu(hdev, rctx->buffer, rctx->bufcnt, 1); + + rctx->bufcnt = 0; + + return err; +} + +static void stm32_hash_copy_hash(struct ahash_request *req) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + u32 *hash = (u32 *)rctx->digest; + unsigned int i, hashsize; + + switch (rctx->flags & HASH_FLAGS_ALGO_MASK) { + case HASH_FLAGS_MD5: + hashsize = MD5_DIGEST_SIZE; + break; + case HASH_FLAGS_SHA1: + hashsize = SHA1_DIGEST_SIZE; + break; + case HASH_FLAGS_SHA224: + hashsize = SHA224_DIGEST_SIZE; + break; + case HASH_FLAGS_SHA256: + hashsize = SHA256_DIGEST_SIZE; + break; + default: + return; + } + + for (i = 0; i < hashsize / sizeof(u32); i++) + hash[i] = be32_to_cpu(stm32_hash_read(rctx->hdev, + HASH_HREG(i))); +} + +static int stm32_hash_finish(struct ahash_request *req) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + + if (!req->result) + return -EINVAL; + + memcpy(req->result, rctx->digest, rctx->digcnt); + + return 0; +} + +static void stm32_hash_finish_req(struct ahash_request *req, int err) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_dev *hdev = rctx->hdev; + + if (!err && (HASH_FLAGS_FINAL & hdev->flags)) { + stm32_hash_copy_hash(req); + err = stm32_hash_finish(req); + hdev->flags &= ~(HASH_FLAGS_FINAL | HASH_FLAGS_CPU | + HASH_FLAGS_INIT | HASH_FLAGS_DMA_READY | + HASH_FLAGS_OUTPUT_READY | HASH_FLAGS_HMAC | + HASH_FLAGS_HMAC_INIT | HASH_FLAGS_HMAC_FINAL | + HASH_FLAGS_HMAC_KEY); + } else { + rctx->flags |= HASH_FLAGS_ERRORS; + } + + crypto_finalize_hash_request(hdev->engine, req, err); +} + +static int stm32_hash_hw_init(struct stm32_hash_dev *hdev, + struct stm32_hash_request_ctx *rctx) +{ + if (!(HASH_FLAGS_INIT & hdev->flags)) { + stm32_hash_write(hdev, HASH_CR, HASH_CR_INIT); + stm32_hash_write(hdev, HASH_STR, 0); + stm32_hash_write(hdev, HASH_DIN, 0); + stm32_hash_write(hdev, HASH_IMR, 0); + hdev->err = 0; + } + + return 0; +} + +static int stm32_hash_handle_queue(struct stm32_hash_dev *hdev, + struct ahash_request *req) +{ + return crypto_transfer_hash_request_to_engine(hdev->engine, req); +} + +static int stm32_hash_prepare_req(struct crypto_engine *engine, + struct ahash_request *req) +{ + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + struct stm32_hash_request_ctx *rctx; + + if (!hdev) + return -ENODEV; + + hdev->req = req; + + rctx = ahash_request_ctx(req); + + dev_dbg(hdev->dev, "processing new req, op: %lu, nbytes %d\n", + rctx->op, req->nbytes); + + return stm32_hash_hw_init(hdev, rctx); +} + +static int stm32_hash_one_request(struct crypto_engine *engine, + struct ahash_request *req) +{ + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + struct stm32_hash_request_ctx *rctx; + int err = 0; + + if (!hdev) + return -ENODEV; + + hdev->req = req; + + rctx = ahash_request_ctx(req); + + if (rctx->op == HASH_OP_UPDATE) + err = stm32_hash_update_req(hdev); + else if (rctx->op == HASH_OP_FINAL) + err = stm32_hash_final_req(hdev); + + if (err != -EINPROGRESS) + /* done task will not finish it, so do it here */ + stm32_hash_finish_req(req, err); + + return 0; +} + +static int stm32_hash_enqueue(struct ahash_request *req, unsigned int op) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_ctx *ctx = crypto_tfm_ctx(req->base.tfm); + struct stm32_hash_dev *hdev = ctx->hdev; + + rctx->op = op; + + return stm32_hash_handle_queue(hdev, req); +} + +static int stm32_hash_update(struct ahash_request *req) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + int ret; + + if (!req->nbytes || !(rctx->flags & HASH_FLAGS_CPU)) + return 0; + + rctx->total = req->nbytes; + rctx->sg = req->src; + rctx->offset = 0; + + if ((rctx->bufcnt + rctx->total < rctx->buflen)) { + stm32_hash_append_sg(rctx); + return 0; + } + + ret = stm32_hash_enqueue(req, HASH_OP_UPDATE); + + if (rctx->flags & HASH_FLAGS_FINUP) + return ret; + + return 0; +} + +static int stm32_hash_final(struct ahash_request *req) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + + rctx->flags |= HASH_FLAGS_FINUP; + + return stm32_hash_enqueue(req, HASH_OP_FINAL); +} + +static int stm32_hash_finup(struct ahash_request *req) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + int err1, err2; + + rctx->flags |= HASH_FLAGS_FINUP; + + if (hdev->dma_lch && stm32_hash_dma_aligned_data(req)) + rctx->flags &= ~HASH_FLAGS_CPU; + + err1 = stm32_hash_update(req); + + if (err1 == -EINPROGRESS || err1 == -EBUSY) + return err1; + + /* + * final() has to be always called to cleanup resources + * even if update() failed, except EINPROGRESS + */ + err2 = stm32_hash_final(req); + + return err1 ?: err2; +} + +static int stm32_hash_digest(struct ahash_request *req) +{ + return stm32_hash_init(req) ?: stm32_hash_finup(req); +} + +static int stm32_hash_export(struct ahash_request *req, void *out) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + u32 *preg; + unsigned int i; + + while (!(stm32_hash_read(hdev, HASH_SR) & HASH_SR_DATA_INPUT_READY)) + cpu_relax(); + + rctx->hw_context = kmalloc(sizeof(u32) * (3 + HASH_CSR_REGISTER_NUMBER), + GFP_KERNEL); + + preg = rctx->hw_context; + + *preg++ = stm32_hash_read(hdev, HASH_IMR); + *preg++ = stm32_hash_read(hdev, HASH_STR); + *preg++ = stm32_hash_read(hdev, HASH_CR); + for (i = 0; i < HASH_CSR_REGISTER_NUMBER; i++) + *preg++ = stm32_hash_read(hdev, HASH_CSR(i)); + + memcpy(out, rctx, sizeof(*rctx)); + + return 0; +} + +static int stm32_hash_import(struct ahash_request *req, const void *in) +{ + struct stm32_hash_request_ctx *rctx = ahash_request_ctx(req); + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); + struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx); + const u32 *preg = in; + u32 reg; + unsigned int i; + + memcpy(rctx, in, sizeof(*rctx)); + + preg = rctx->hw_context; + + stm32_hash_write(hdev, HASH_IMR, *preg++); + stm32_hash_write(hdev, HASH_STR, *preg++); + stm32_hash_write(hdev, HASH_CR, *preg); + reg = *preg++ | HASH_CR_INIT; + stm32_hash_write(hdev, HASH_CR, reg); + + for (i = 0; i < HASH_CSR_REGISTER_NUMBER; i++) + stm32_hash_write(hdev, HASH_CSR(i), *preg++); + + kfree(rctx->hw_context); + + return 0; +} + +static int stm32_hash_setkey(struct crypto_ahash *tfm, + const u8 *key, unsigned int keylen) +{ + struct stm32_hash_ctx *ctx = crypto_ahash_ctx(tfm); + + if (keylen <= HASH_MAX_KEY_SIZE) { + memcpy(ctx->key, key, keylen); + ctx->keylen = keylen; + } else { + return -ENOMEM; + } + + return 0; +} + +static int stm32_hash_cra_init_algs(struct crypto_tfm *tfm, + const char *algs_hmac_name) +{ + struct stm32_hash_ctx *ctx = crypto_tfm_ctx(tfm); + + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct stm32_hash_request_ctx)); + + ctx->keylen = 0; + + if (algs_hmac_name) + ctx->flags |= HASH_FLAGS_HMAC; + + return 0; +} + +static int stm32_hash_cra_init(struct crypto_tfm *tfm) +{ + return stm32_hash_cra_init_algs(tfm, NULL); +} + +static int stm32_hash_cra_md5_init(struct crypto_tfm *tfm) +{ + return stm32_hash_cra_init_algs(tfm, "md5"); +} + +static int stm32_hash_cra_sha1_init(struct crypto_tfm *tfm) +{ + return stm32_hash_cra_init_algs(tfm, "sha1"); +} + +static int stm32_hash_cra_sha224_init(struct crypto_tfm *tfm) +{ + return stm32_hash_cra_init_algs(tfm, "sha224"); +} + +static int stm32_hash_cra_sha256_init(struct crypto_tfm *tfm) +{ + return stm32_hash_cra_init_algs(tfm, "sha256"); +} + +static irqreturn_t stm32_hash_irq_thread(int irq, void *dev_id) +{ + struct stm32_hash_dev *hdev = dev_id; + int err; + + if (HASH_FLAGS_CPU & hdev->flags) { + if (HASH_FLAGS_OUTPUT_READY & hdev->flags) { + hdev->flags &= ~HASH_FLAGS_OUTPUT_READY; + goto finish; + } + } else if (HASH_FLAGS_DMA_READY & hdev->flags) { + if (HASH_FLAGS_DMA_ACTIVE & hdev->flags) { + hdev->flags &= ~HASH_FLAGS_DMA_ACTIVE; + goto finish; + } + } + + return IRQ_HANDLED; + +finish: + /*Finish current request */ + stm32_hash_finish_req(hdev->req, err); + + return IRQ_HANDLED; +} + +static irqreturn_t stm32_hash_irq_handler(int irq, void *dev_id) +{ + struct stm32_hash_dev *hdev = dev_id; + u32 reg; + + reg = stm32_hash_read(hdev, HASH_SR); + if (reg & HASH_SR_OUTPUT_READY) { + reg &= ~HASH_SR_OUTPUT_READY; + stm32_hash_write(hdev, HASH_SR, reg); + hdev->flags |= HASH_FLAGS_OUTPUT_READY; + return IRQ_WAKE_THREAD; + } + + return IRQ_NONE; +} + +static struct ahash_alg algs_md5_sha1[] = { + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .halg = { + .digestsize = MD5_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "md5", + .cra_driver_name = "stm32-md5", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = MD5_HMAC_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .setkey = stm32_hash_setkey, + .halg = { + .digestsize = MD5_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "hmac(md5)", + .cra_driver_name = "stm32-hmac-md5", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = MD5_HMAC_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_md5_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .halg = { + .digestsize = SHA1_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "sha1", + .cra_driver_name = "stm32-sha1", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA1_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .setkey = stm32_hash_setkey, + .halg = { + .digestsize = SHA1_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "hmac(sha1)", + .cra_driver_name = "stm32-hmac-sha1", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA1_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_sha1_init, + .cra_module = THIS_MODULE, + } + } + }, +}; + +static struct ahash_alg algs_sha224_sha256[] = { + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .halg = { + .digestsize = SHA224_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "sha224", + .cra_driver_name = "stm32-sha224", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA224_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .setkey = stm32_hash_setkey, + .export = stm32_hash_export, + .import = stm32_hash_import, + .halg = { + .digestsize = SHA224_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "hmac(sha224)", + .cra_driver_name = "stm32-hmac-sha224", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA224_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_sha224_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .halg = { + .digestsize = SHA256_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "sha256", + .cra_driver_name = "stm32-sha256", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA256_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_init, + .cra_module = THIS_MODULE, + } + } + }, + { + .init = stm32_hash_init, + .update = stm32_hash_update, + .final = stm32_hash_final, + .finup = stm32_hash_finup, + .digest = stm32_hash_digest, + .export = stm32_hash_export, + .import = stm32_hash_import, + .setkey = stm32_hash_setkey, + .halg = { + .digestsize = SHA256_DIGEST_SIZE, + .statesize = sizeof(struct stm32_hash_request_ctx), + .base = { + .cra_name = "hmac(sha256)", + .cra_driver_name = "stm32-hmac-sha256", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SHA256_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct stm32_hash_ctx), + .cra_alignmask = 3, + .cra_init = stm32_hash_cra_sha256_init, + .cra_module = THIS_MODULE, + } + } + }, +}; + +static int stm32_hash_register_algs(struct stm32_hash_dev *hdev) +{ + unsigned int i, j; + int err; + + for (i = 0; i < hdev->pdata->algs_info_size; i++) { + for (j = 0; j < hdev->pdata->algs_info[i].size; j++) { + err = crypto_register_ahash( + &hdev->pdata->algs_info[i].algs_list[j]); + if (err) + goto err_algs; + } + } + + return 0; +err_algs: + dev_err(hdev->dev, "Algo %d : %d failed\n", i, j); + for (; i--; ) { + for (; j--;) + crypto_unregister_ahash( + &hdev->pdata->algs_info[i].algs_list[j]); + } + + return err; +} + +static int stm32_hash_unregister_algs(struct stm32_hash_dev *hdev) +{ + unsigned int i, j; + + for (i = 0; i < hdev->pdata->algs_info_size; i++) { + for (j = 0; j < hdev->pdata->algs_info[i].size; j++) + crypto_unregister_ahash( + &hdev->pdata->algs_info[i].algs_list[j]); + } + + return 0; +} + +static struct stm32_hash_algs_info stm32_hash_algs_info_stm32f4[] = { + { + .algs_list = algs_md5_sha1, + .size = ARRAY_SIZE(algs_md5_sha1), + }, +}; + +static const struct stm32_hash_pdata stm32_hash_pdata_stm32f4 = { + .algs_info = stm32_hash_algs_info_stm32f4, + .algs_info_size = ARRAY_SIZE(stm32_hash_algs_info_stm32f4), +}; + +static struct stm32_hash_algs_info stm32_hash_algs_info_stm32f7[] = { + { + .algs_list = algs_md5_sha1, + .size = ARRAY_SIZE(algs_md5_sha1), + }, + { + .algs_list = algs_sha224_sha256, + .size = ARRAY_SIZE(algs_sha224_sha256), + }, +}; + +static const struct stm32_hash_pdata stm32_hash_pdata_stm32f7 = { + .algs_info = stm32_hash_algs_info_stm32f7, + .algs_info_size = ARRAY_SIZE(stm32_hash_algs_info_stm32f7), +}; + +static const struct of_device_id stm32_hash_of_match[] = { + { + .compatible = "st,stm32f456-hash", + .data = &stm32_hash_pdata_stm32f4, + }, + { + .compatible = "st,stm32f756-hash", + .data = &stm32_hash_pdata_stm32f7, + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, stm32_hash_of_match); + +static int stm32_hash_get_of_match(struct stm32_hash_dev *hdev, + struct device *dev) +{ + const struct of_device_id *match; + int err; + + match = of_match_device(stm32_hash_of_match, dev); + if (!match) { + dev_err(dev, "no compatible OF match\n"); + return -EINVAL; + } + + err = of_property_read_u32(dev->of_node, "dma-maxburst", + &hdev->dma_maxburst); + + hdev->pdata = match->data; + + return err; +} + +static int stm32_hash_probe(struct platform_device *pdev) +{ + struct stm32_hash_dev *hdev; + struct device *dev = &pdev->dev; + struct resource *res; + int ret, irq; + + hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL); + if (!hdev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hdev->io_base = devm_ioremap_resource(dev, res); + if (IS_ERR(hdev->io_base)) + return PTR_ERR(hdev->io_base); + + hdev->phys_base = res->start; + + ret = stm32_hash_get_of_match(hdev, dev); + if (ret) + return ret; + + 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_hash_irq_handler, + stm32_hash_irq_thread, IRQF_ONESHOT, + dev_name(dev), hdev); + if (ret) { + dev_err(dev, "Cannot grab IRQ\n"); + return ret; + } + + hdev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(hdev->clk)) { + dev_err(dev, "failed to get clock for hash (%lu)\n", + PTR_ERR(hdev->clk)); + return PTR_ERR(hdev->clk); + } + + ret = clk_prepare_enable(hdev->clk); + if (ret) { + dev_err(dev, "failed to enable hash clock (%d)\n", ret); + return ret; + } + + hdev->rst = devm_reset_control_get(&pdev->dev, NULL); + if (!IS_ERR(hdev->rst)) { + reset_control_assert(hdev->rst); + udelay(2); + reset_control_deassert(hdev->rst); + } + + hdev->dev = dev; + + platform_set_drvdata(pdev, hdev); + + ret = stm32_hash_dma_init(hdev); + if (ret) + dev_dbg(dev, "DMA mode not available\n"); + + spin_lock(&stm32_hash.lock); + list_add_tail(&hdev->list, &stm32_hash.dev_list); + spin_unlock(&stm32_hash.lock); + + /* Initialize crypto engine */ + hdev->engine = crypto_engine_alloc_init(dev, 1); + if (!hdev->engine) { + ret = -ENOMEM; + goto err_engine; + } + + hdev->engine->prepare_hash_request = stm32_hash_prepare_req; + hdev->engine->hash_one_request = stm32_hash_one_request; + + ret = crypto_engine_start(hdev->engine); + if (ret) + goto err_engine_start; + + hdev->dma_mode = stm32_hash_read(hdev, HASH_HWCFGR); + + /* Register algos */ + ret = stm32_hash_register_algs(hdev); + if (ret) + goto err_algs; + + dev_info(dev, "Init HASH done HW ver %x DMA mode %u\n", + stm32_hash_read(hdev, HASH_VER), hdev->dma_mode); + + return 0; + +err_algs: +err_engine_start: + crypto_engine_exit(hdev->engine); +err_engine: + spin_lock(&stm32_hash.lock); + list_del(&hdev->list); + spin_unlock(&stm32_hash.lock); + + if (hdev->dma_lch) + dma_release_channel(hdev->dma_lch); + + clk_disable_unprepare(hdev->clk); + + return ret; +} + +static int stm32_hash_remove(struct platform_device *pdev) +{ + static struct stm32_hash_dev *hdev; + + hdev = platform_get_drvdata(pdev); + if (!hdev) + return -ENODEV; + + stm32_hash_unregister_algs(hdev); + + crypto_engine_exit(hdev->engine); + + spin_lock(&stm32_hash.lock); + list_del(&hdev->list); + spin_unlock(&stm32_hash.lock); + + if (hdev->dma_lch) + dma_release_channel(hdev->dma_lch); + + clk_disable_unprepare(hdev->clk); + + return 0; +} + +static struct platform_driver stm32_hash_driver = { + .probe = stm32_hash_probe, + .remove = stm32_hash_remove, + .driver = { + .name = "stm32-hash", + .of_match_table = stm32_hash_of_match, + } +}; + +module_platform_driver(stm32_hash_driver); + +MODULE_DESCRIPTION("STM32 SHA1/224/256 & MD5 (HMAC) hw accelerator driver"); +MODULE_AUTHOR("Lionel Debieve <[email protected]>"); +MODULE_LICENSE("GPL v2"); |