| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Cyrille Pitchen | 8604 | 68.37% | 22 | 36.07% |
| Nicolas Royer | 2813 | 22.35% | 2 | 3.28% |
| Tudor-Dan Ambarus | 400 | 3.18% | 15 | 24.59% |
| Ard Biesheuvel | 268 | 2.13% | 1 | 1.64% |
| Romain Izard | 191 | 1.52% | 2 | 3.28% |
| Leilei Zhao | 98 | 0.78% | 6 | 9.84% |
| Nicolas Ferre | 61 | 0.48% | 1 | 1.64% |
| Herbert Xu | 47 | 0.37% | 3 | 4.92% |
| Peter Ujfalusi | 37 | 0.29% | 1 | 1.64% |
| Corentin Labbe | 35 | 0.28% | 3 | 4.92% |
| Ben Dooks | 17 | 0.14% | 1 | 1.64% |
| Vladimir Zapolskiy | 9 | 0.07% | 1 | 1.64% |
| Eric Biggers | 2 | 0.02% | 1 | 1.64% |
| Antoine Tenart | 1 | 0.01% | 1 | 1.64% |
| Colin Ian King | 1 | 0.01% | 1 | 1.64% |
| Total | 12584 | 61 |
// SPDX-License-Identifier: GPL-2.0 /* * Cryptographic API. * * Support for ATMEL AES HW acceleration. * * Copyright (c) 2012 Eukréa Electromatique - ATMEL * Author: Nicolas Royer <nicolas@eukrea.com> * * Some ideas are from omap-aes.c driver. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/hw_random.h> #include <linux/platform_device.h> #include <linux/device.h> #include <linux/dmaengine.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/scatterlist.h> #include <linux/dma-mapping.h> #include <linux/of_device.h> #include <linux/delay.h> #include <linux/crypto.h> #include <crypto/scatterwalk.h> #include <crypto/algapi.h> #include <crypto/aes.h> #include <crypto/gcm.h> #include <crypto/xts.h> #include <crypto/internal/aead.h> #include <crypto/internal/skcipher.h> #include "atmel-aes-regs.h" #include "atmel-authenc.h" #define ATMEL_AES_PRIORITY 300 #define ATMEL_AES_BUFFER_ORDER 2 #define ATMEL_AES_BUFFER_SIZE (PAGE_SIZE << ATMEL_AES_BUFFER_ORDER) #define CFB8_BLOCK_SIZE 1 #define CFB16_BLOCK_SIZE 2 #define CFB32_BLOCK_SIZE 4 #define CFB64_BLOCK_SIZE 8 #define SIZE_IN_WORDS(x) ((x) >> 2) /* AES flags */ /* Reserve bits [18:16] [14:12] [1:0] for mode (same as for AES_MR) */ #define AES_FLAGS_ENCRYPT AES_MR_CYPHER_ENC #define AES_FLAGS_GTAGEN AES_MR_GTAGEN #define AES_FLAGS_OPMODE_MASK (AES_MR_OPMOD_MASK | AES_MR_CFBS_MASK) #define AES_FLAGS_ECB AES_MR_OPMOD_ECB #define AES_FLAGS_CBC AES_MR_OPMOD_CBC #define AES_FLAGS_OFB AES_MR_OPMOD_OFB #define AES_FLAGS_CFB128 (AES_MR_OPMOD_CFB | AES_MR_CFBS_128b) #define AES_FLAGS_CFB64 (AES_MR_OPMOD_CFB | AES_MR_CFBS_64b) #define AES_FLAGS_CFB32 (AES_MR_OPMOD_CFB | AES_MR_CFBS_32b) #define AES_FLAGS_CFB16 (AES_MR_OPMOD_CFB | AES_MR_CFBS_16b) #define AES_FLAGS_CFB8 (AES_MR_OPMOD_CFB | AES_MR_CFBS_8b) #define AES_FLAGS_CTR AES_MR_OPMOD_CTR #define AES_FLAGS_GCM AES_MR_OPMOD_GCM #define AES_FLAGS_XTS AES_MR_OPMOD_XTS #define AES_FLAGS_MODE_MASK (AES_FLAGS_OPMODE_MASK | \ AES_FLAGS_ENCRYPT | \ AES_FLAGS_GTAGEN) #define AES_FLAGS_BUSY BIT(3) #define AES_FLAGS_DUMP_REG BIT(4) #define AES_FLAGS_OWN_SHA BIT(5) #define AES_FLAGS_PERSISTENT AES_FLAGS_BUSY #define ATMEL_AES_QUEUE_LENGTH 50 #define ATMEL_AES_DMA_THRESHOLD 256 struct atmel_aes_caps { bool has_dualbuff; bool has_cfb64; bool has_gcm; bool has_xts; bool has_authenc; u32 max_burst_size; }; struct atmel_aes_dev; typedef int (*atmel_aes_fn_t)(struct atmel_aes_dev *); struct atmel_aes_base_ctx { struct atmel_aes_dev *dd; atmel_aes_fn_t start; int keylen; u32 key[AES_KEYSIZE_256 / sizeof(u32)]; u16 block_size; bool is_aead; }; struct atmel_aes_ctx { struct atmel_aes_base_ctx base; }; struct atmel_aes_ctr_ctx { struct atmel_aes_base_ctx base; __be32 iv[AES_BLOCK_SIZE / sizeof(u32)]; size_t offset; struct scatterlist src[2]; struct scatterlist dst[2]; u32 blocks; }; struct atmel_aes_gcm_ctx { struct atmel_aes_base_ctx base; struct scatterlist src[2]; struct scatterlist dst[2]; __be32 j0[AES_BLOCK_SIZE / sizeof(u32)]; u32 tag[AES_BLOCK_SIZE / sizeof(u32)]; __be32 ghash[AES_BLOCK_SIZE / sizeof(u32)]; size_t textlen; const __be32 *ghash_in; __be32 *ghash_out; atmel_aes_fn_t ghash_resume; }; struct atmel_aes_xts_ctx { struct atmel_aes_base_ctx base; u32 key2[AES_KEYSIZE_256 / sizeof(u32)]; }; #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) struct atmel_aes_authenc_ctx { struct atmel_aes_base_ctx base; struct atmel_sha_authenc_ctx *auth; }; #endif struct atmel_aes_reqctx { unsigned long mode; u8 lastc[AES_BLOCK_SIZE]; }; #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) struct atmel_aes_authenc_reqctx { struct atmel_aes_reqctx base; struct scatterlist src[2]; struct scatterlist dst[2]; size_t textlen; u32 digest[SHA512_DIGEST_SIZE / sizeof(u32)]; /* auth_req MUST be place last. */ struct ahash_request auth_req; }; #endif struct atmel_aes_dma { struct dma_chan *chan; struct scatterlist *sg; int nents; unsigned int remainder; unsigned int sg_len; }; struct atmel_aes_dev { struct list_head list; unsigned long phys_base; void __iomem *io_base; struct crypto_async_request *areq; struct atmel_aes_base_ctx *ctx; bool is_async; atmel_aes_fn_t resume; atmel_aes_fn_t cpu_transfer_complete; struct device *dev; struct clk *iclk; int irq; unsigned long flags; spinlock_t lock; struct crypto_queue queue; struct tasklet_struct done_task; struct tasklet_struct queue_task; size_t total; size_t datalen; u32 *data; struct atmel_aes_dma src; struct atmel_aes_dma dst; size_t buflen; void *buf; struct scatterlist aligned_sg; struct scatterlist *real_dst; struct atmel_aes_caps caps; u32 hw_version; }; struct atmel_aes_drv { struct list_head dev_list; spinlock_t lock; }; static struct atmel_aes_drv atmel_aes = { .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list), .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock), }; #ifdef VERBOSE_DEBUG static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz) { switch (offset) { case AES_CR: return "CR"; case AES_MR: return "MR"; case AES_ISR: return "ISR"; case AES_IMR: return "IMR"; case AES_IER: return "IER"; case AES_IDR: return "IDR"; case AES_KEYWR(0): case AES_KEYWR(1): case AES_KEYWR(2): case AES_KEYWR(3): case AES_KEYWR(4): case AES_KEYWR(5): case AES_KEYWR(6): case AES_KEYWR(7): snprintf(tmp, sz, "KEYWR[%u]", (offset - AES_KEYWR(0)) >> 2); break; case AES_IDATAR(0): case AES_IDATAR(1): case AES_IDATAR(2): case AES_IDATAR(3): snprintf(tmp, sz, "IDATAR[%u]", (offset - AES_IDATAR(0)) >> 2); break; case AES_ODATAR(0): case AES_ODATAR(1): case AES_ODATAR(2): case AES_ODATAR(3): snprintf(tmp, sz, "ODATAR[%u]", (offset - AES_ODATAR(0)) >> 2); break; case AES_IVR(0): case AES_IVR(1): case AES_IVR(2): case AES_IVR(3): snprintf(tmp, sz, "IVR[%u]", (offset - AES_IVR(0)) >> 2); break; case AES_AADLENR: return "AADLENR"; case AES_CLENR: return "CLENR"; case AES_GHASHR(0): case AES_GHASHR(1): case AES_GHASHR(2): case AES_GHASHR(3): snprintf(tmp, sz, "GHASHR[%u]", (offset - AES_GHASHR(0)) >> 2); break; case AES_TAGR(0): case AES_TAGR(1): case AES_TAGR(2): case AES_TAGR(3): snprintf(tmp, sz, "TAGR[%u]", (offset - AES_TAGR(0)) >> 2); break; case AES_CTRR: return "CTRR"; case AES_GCMHR(0): case AES_GCMHR(1): case AES_GCMHR(2): case AES_GCMHR(3): snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2); break; case AES_EMR: return "EMR"; case AES_TWR(0): case AES_TWR(1): case AES_TWR(2): case AES_TWR(3): snprintf(tmp, sz, "TWR[%u]", (offset - AES_TWR(0)) >> 2); break; case AES_ALPHAR(0): case AES_ALPHAR(1): case AES_ALPHAR(2): case AES_ALPHAR(3): snprintf(tmp, sz, "ALPHAR[%u]", (offset - AES_ALPHAR(0)) >> 2); break; default: snprintf(tmp, sz, "0x%02x", offset); break; } return tmp; } #endif /* VERBOSE_DEBUG */ /* Shared functions */ static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset) { u32 value = readl_relaxed(dd->io_base + offset); #ifdef VERBOSE_DEBUG if (dd->flags & AES_FLAGS_DUMP_REG) { char tmp[16]; dev_vdbg(dd->dev, "read 0x%08x from %s\n", value, atmel_aes_reg_name(offset, tmp, sizeof(tmp))); } #endif /* VERBOSE_DEBUG */ return value; } static inline void atmel_aes_write(struct atmel_aes_dev *dd, u32 offset, u32 value) { #ifdef VERBOSE_DEBUG if (dd->flags & AES_FLAGS_DUMP_REG) { char tmp[16]; dev_vdbg(dd->dev, "write 0x%08x into %s\n", value, atmel_aes_reg_name(offset, tmp, sizeof(tmp))); } #endif /* VERBOSE_DEBUG */ writel_relaxed(value, dd->io_base + offset); } static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset, u32 *value, int count) { for (; count--; value++, offset += 4) *value = atmel_aes_read(dd, offset); } static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset, const u32 *value, int count) { for (; count--; value++, offset += 4) atmel_aes_write(dd, offset, *value); } static inline void atmel_aes_read_block(struct atmel_aes_dev *dd, u32 offset, void *value) { atmel_aes_read_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE)); } static inline void atmel_aes_write_block(struct atmel_aes_dev *dd, u32 offset, const void *value) { atmel_aes_write_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE)); } static inline int atmel_aes_wait_for_data_ready(struct atmel_aes_dev *dd, atmel_aes_fn_t resume) { u32 isr = atmel_aes_read(dd, AES_ISR); if (unlikely(isr & AES_INT_DATARDY)) return resume(dd); dd->resume = resume; atmel_aes_write(dd, AES_IER, AES_INT_DATARDY); return -EINPROGRESS; } static inline size_t atmel_aes_padlen(size_t len, size_t block_size) { len &= block_size - 1; return len ? block_size - len : 0; } static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_base_ctx *ctx) { struct atmel_aes_dev *aes_dd = NULL; struct atmel_aes_dev *tmp; spin_lock_bh(&atmel_aes.lock); if (!ctx->dd) { list_for_each_entry(tmp, &atmel_aes.dev_list, list) { aes_dd = tmp; break; } ctx->dd = aes_dd; } else { aes_dd = ctx->dd; } spin_unlock_bh(&atmel_aes.lock); return aes_dd; } static int atmel_aes_hw_init(struct atmel_aes_dev *dd) { int err; err = clk_enable(dd->iclk); if (err) return err; atmel_aes_write(dd, AES_CR, AES_CR_SWRST); atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET); return 0; } static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd) { return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff; } static int atmel_aes_hw_version_init(struct atmel_aes_dev *dd) { int err; err = atmel_aes_hw_init(dd); if (err) return err; dd->hw_version = atmel_aes_get_version(dd); dev_info(dd->dev, "version: 0x%x\n", dd->hw_version); clk_disable(dd->iclk); return 0; } static inline void atmel_aes_set_mode(struct atmel_aes_dev *dd, const struct atmel_aes_reqctx *rctx) { /* Clear all but persistent flags and set request flags. */ dd->flags = (dd->flags & AES_FLAGS_PERSISTENT) | rctx->mode; } static inline bool atmel_aes_is_encrypt(const struct atmel_aes_dev *dd) { return (dd->flags & AES_FLAGS_ENCRYPT); } #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err); #endif static void atmel_aes_set_iv_as_last_ciphertext_block(struct atmel_aes_dev *dd) { struct skcipher_request *req = skcipher_request_cast(dd->areq); struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req); struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); unsigned int ivsize = crypto_skcipher_ivsize(skcipher); if (req->cryptlen < ivsize) return; if (rctx->mode & AES_FLAGS_ENCRYPT) { scatterwalk_map_and_copy(req->iv, req->dst, req->cryptlen - ivsize, ivsize, 0); } else { if (req->src == req->dst) memcpy(req->iv, rctx->lastc, ivsize); else scatterwalk_map_and_copy(req->iv, req->src, req->cryptlen - ivsize, ivsize, 0); } } static inline struct atmel_aes_ctr_ctx * atmel_aes_ctr_ctx_cast(struct atmel_aes_base_ctx *ctx) { return container_of(ctx, struct atmel_aes_ctr_ctx, base); } static void atmel_aes_ctr_update_req_iv(struct atmel_aes_dev *dd) { struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx); struct skcipher_request *req = skcipher_request_cast(dd->areq); struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); unsigned int ivsize = crypto_skcipher_ivsize(skcipher); int i; /* * The CTR transfer works in fragments of data of maximum 1 MByte * because of the 16 bit CTR counter embedded in the IP. When reaching * here, ctx->blocks contains the number of blocks of the last fragment * processed, there is no need to explicit cast it to u16. */ for (i = 0; i < ctx->blocks; i++) crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE); memcpy(req->iv, ctx->iv, ivsize); } static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err) { struct skcipher_request *req = skcipher_request_cast(dd->areq); struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req); #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) if (dd->ctx->is_aead) atmel_aes_authenc_complete(dd, err); #endif clk_disable(dd->iclk); dd->flags &= ~AES_FLAGS_BUSY; if (!err && !dd->ctx->is_aead && (rctx->mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB) { if ((rctx->mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_CTR) atmel_aes_set_iv_as_last_ciphertext_block(dd); else atmel_aes_ctr_update_req_iv(dd); } if (dd->is_async) dd->areq->complete(dd->areq, err); tasklet_schedule(&dd->queue_task); return err; } static void atmel_aes_write_ctrl_key(struct atmel_aes_dev *dd, bool use_dma, const __be32 *iv, const u32 *key, int keylen) { u32 valmr = 0; /* MR register must be set before IV registers */ if (keylen == AES_KEYSIZE_128) valmr |= AES_MR_KEYSIZE_128; else if (keylen == AES_KEYSIZE_192) valmr |= AES_MR_KEYSIZE_192; else valmr |= AES_MR_KEYSIZE_256; valmr |= dd->flags & AES_FLAGS_MODE_MASK; if (use_dma) { valmr |= AES_MR_SMOD_IDATAR0; if (dd->caps.has_dualbuff) valmr |= AES_MR_DUALBUFF; } else { valmr |= AES_MR_SMOD_AUTO; } atmel_aes_write(dd, AES_MR, valmr); atmel_aes_write_n(dd, AES_KEYWR(0), key, SIZE_IN_WORDS(keylen)); if (iv && (valmr & AES_MR_OPMOD_MASK) != AES_MR_OPMOD_ECB) atmel_aes_write_block(dd, AES_IVR(0), iv); } static inline void atmel_aes_write_ctrl(struct atmel_aes_dev *dd, bool use_dma, const __be32 *iv) { atmel_aes_write_ctrl_key(dd, use_dma, iv, dd->ctx->key, dd->ctx->keylen); } /* CPU transfer */ static int atmel_aes_cpu_transfer(struct atmel_aes_dev *dd) { int err = 0; u32 isr; for (;;) { atmel_aes_read_block(dd, AES_ODATAR(0), dd->data); dd->data += 4; dd->datalen -= AES_BLOCK_SIZE; if (dd->datalen < AES_BLOCK_SIZE) break; atmel_aes_write_block(dd, AES_IDATAR(0), dd->data); isr = atmel_aes_read(dd, AES_ISR); if (!(isr & AES_INT_DATARDY)) { dd->resume = atmel_aes_cpu_transfer; atmel_aes_write(dd, AES_IER, AES_INT_DATARDY); return -EINPROGRESS; } } if (!sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst), dd->buf, dd->total)) err = -EINVAL; if (err) return atmel_aes_complete(dd, err); return dd->cpu_transfer_complete(dd); } static int atmel_aes_cpu_start(struct atmel_aes_dev *dd, struct scatterlist *src, struct scatterlist *dst, size_t len, atmel_aes_fn_t resume) { size_t padlen = atmel_aes_padlen(len, AES_BLOCK_SIZE); if (unlikely(len == 0)) return -EINVAL; sg_copy_to_buffer(src, sg_nents(src), dd->buf, len); dd->total = len; dd->real_dst = dst; dd->cpu_transfer_complete = resume; dd->datalen = len + padlen; dd->data = (u32 *)dd->buf; atmel_aes_write_block(dd, AES_IDATAR(0), dd->data); return atmel_aes_wait_for_data_ready(dd, atmel_aes_cpu_transfer); } /* DMA transfer */ static void atmel_aes_dma_callback(void *data); static bool atmel_aes_check_aligned(struct atmel_aes_dev *dd, struct scatterlist *sg, size_t len, struct atmel_aes_dma *dma) { int nents; if (!IS_ALIGNED(len, dd->ctx->block_size)) return false; for (nents = 0; sg; sg = sg_next(sg), ++nents) { if (!IS_ALIGNED(sg->offset, sizeof(u32))) return false; if (len <= sg->length) { if (!IS_ALIGNED(len, dd->ctx->block_size)) return false; dma->nents = nents+1; dma->remainder = sg->length - len; sg->length = len; return true; } if (!IS_ALIGNED(sg->length, dd->ctx->block_size)) return false; len -= sg->length; } return false; } static inline void atmel_aes_restore_sg(const struct atmel_aes_dma *dma) { struct scatterlist *sg = dma->sg; int nents = dma->nents; if (!dma->remainder) return; while (--nents > 0 && sg) sg = sg_next(sg); if (!sg) return; sg->length += dma->remainder; } static int atmel_aes_map(struct atmel_aes_dev *dd, struct scatterlist *src, struct scatterlist *dst, size_t len) { bool src_aligned, dst_aligned; size_t padlen; dd->total = len; dd->src.sg = src; dd->dst.sg = dst; dd->real_dst = dst; src_aligned = atmel_aes_check_aligned(dd, src, len, &dd->src); if (src == dst) dst_aligned = src_aligned; else dst_aligned = atmel_aes_check_aligned(dd, dst, len, &dd->dst); if (!src_aligned || !dst_aligned) { padlen = atmel_aes_padlen(len, dd->ctx->block_size); if (dd->buflen < len + padlen) return -ENOMEM; if (!src_aligned) { sg_copy_to_buffer(src, sg_nents(src), dd->buf, len); dd->src.sg = &dd->aligned_sg; dd->src.nents = 1; dd->src.remainder = 0; } if (!dst_aligned) { dd->dst.sg = &dd->aligned_sg; dd->dst.nents = 1; dd->dst.remainder = 0; } sg_init_table(&dd->aligned_sg, 1); sg_set_buf(&dd->aligned_sg, dd->buf, len + padlen); } if (dd->src.sg == dd->dst.sg) { dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents, DMA_BIDIRECTIONAL); dd->dst.sg_len = dd->src.sg_len; if (!dd->src.sg_len) return -EFAULT; } else { dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents, DMA_TO_DEVICE); if (!dd->src.sg_len) return -EFAULT; dd->dst.sg_len = dma_map_sg(dd->dev, dd->dst.sg, dd->dst.nents, DMA_FROM_DEVICE); if (!dd->dst.sg_len) { dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents, DMA_TO_DEVICE); return -EFAULT; } } return 0; } static void atmel_aes_unmap(struct atmel_aes_dev *dd) { if (dd->src.sg == dd->dst.sg) { dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents, DMA_BIDIRECTIONAL); if (dd->src.sg != &dd->aligned_sg) atmel_aes_restore_sg(&dd->src); } else { dma_unmap_sg(dd->dev, dd->dst.sg, dd->dst.nents, DMA_FROM_DEVICE); if (dd->dst.sg != &dd->aligned_sg) atmel_aes_restore_sg(&dd->dst); dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents, DMA_TO_DEVICE); if (dd->src.sg != &dd->aligned_sg) atmel_aes_restore_sg(&dd->src); } if (dd->dst.sg == &dd->aligned_sg) sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst), dd->buf, dd->total); } static int atmel_aes_dma_transfer_start(struct atmel_aes_dev *dd, enum dma_slave_buswidth addr_width, enum dma_transfer_direction dir, u32 maxburst) { struct dma_async_tx_descriptor *desc; struct dma_slave_config config; dma_async_tx_callback callback; struct atmel_aes_dma *dma; int err; memset(&config, 0, sizeof(config)); config.src_addr_width = addr_width; config.dst_addr_width = addr_width; config.src_maxburst = maxburst; config.dst_maxburst = maxburst; switch (dir) { case DMA_MEM_TO_DEV: dma = &dd->src; callback = NULL; config.dst_addr = dd->phys_base + AES_IDATAR(0); break; case DMA_DEV_TO_MEM: dma = &dd->dst; callback = atmel_aes_dma_callback; config.src_addr = dd->phys_base + AES_ODATAR(0); break; default: return -EINVAL; } err = dmaengine_slave_config(dma->chan, &config); if (err) return err; desc = dmaengine_prep_slave_sg(dma->chan, dma->sg, dma->sg_len, dir, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) return -ENOMEM; desc->callback = callback; desc->callback_param = dd; dmaengine_submit(desc); dma_async_issue_pending(dma->chan); return 0; } static int atmel_aes_dma_start(struct atmel_aes_dev *dd, struct scatterlist *src, struct scatterlist *dst, size_t len, atmel_aes_fn_t resume) { enum dma_slave_buswidth addr_width; u32 maxburst; int err; switch (dd->ctx->block_size) { case CFB8_BLOCK_SIZE: addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; maxburst = 1; break; case CFB16_BLOCK_SIZE: addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; maxburst = 1; break; case CFB32_BLOCK_SIZE: case CFB64_BLOCK_SIZE: addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; maxburst = 1; break; case AES_BLOCK_SIZE: addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; maxburst = dd->caps.max_burst_size; break; default: err = -EINVAL; goto exit; } err = atmel_aes_map(dd, src, dst, len); if (err) goto exit; dd->resume = resume; /* Set output DMA transfer first */ err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_DEV_TO_MEM, maxburst); if (err) goto unmap; /* Then set input DMA transfer */ err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_MEM_TO_DEV, maxburst); if (err) goto output_transfer_stop; return -EINPROGRESS; output_transfer_stop: dmaengine_terminate_sync(dd->dst.chan); unmap: atmel_aes_unmap(dd); exit: return atmel_aes_complete(dd, err); } static void atmel_aes_dma_callback(void *data) { struct atmel_aes_dev *dd = data; atmel_aes_unmap(dd); dd->is_async = true; (void)dd->resume(dd); } static int atmel_aes_handle_queue(struct atmel_aes_dev *dd, struct crypto_async_request *new_areq) { struct crypto_async_request *areq, *backlog; struct atmel_aes_base_ctx *ctx; unsigned long flags; bool start_async; int err, ret = 0; spin_lock_irqsave(&dd->lock, flags); if (new_areq) ret = crypto_enqueue_request(&dd->queue, new_areq); if (dd->flags & AES_FLAGS_BUSY) { spin_unlock_irqrestore(&dd->lock, flags); return ret; } backlog = crypto_get_backlog(&dd->queue); areq = crypto_dequeue_request(&dd->queue); if (areq) dd->flags |= AES_FLAGS_BUSY; spin_unlock_irqrestore(&dd->lock, flags); if (!areq) return ret; if (backlog) backlog->complete(backlog, -EINPROGRESS); ctx = crypto_tfm_ctx(areq->tfm); dd->areq = areq; dd->ctx = ctx; start_async = (areq != new_areq); dd->is_async = start_async; /* WARNING: ctx->start() MAY change dd->is_async. */ err = ctx->start(dd); return (start_async) ? ret : err; } /* AES async block ciphers */ static int atmel_aes_transfer_complete(struct atmel_aes_dev *dd) { return atmel_aes_complete(dd, 0); } static int atmel_aes_start(struct atmel_aes_dev *dd) { struct skcipher_request *req = skcipher_request_cast(dd->areq); struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req); bool use_dma = (req->cryptlen >= ATMEL_AES_DMA_THRESHOLD || dd->ctx->block_size != AES_BLOCK_SIZE); int err; atmel_aes_set_mode(dd, rctx); err = atmel_aes_hw_init(dd); if (err) return atmel_aes_complete(dd, err); atmel_aes_write_ctrl(dd, use_dma, (void *)req->iv); if (use_dma) return atmel_aes_dma_start(dd, req->src, req->dst, req->cryptlen, atmel_aes_transfer_complete); return atmel_aes_cpu_start(dd, req->src, req->dst, req->cryptlen, atmel_aes_transfer_complete); } static int atmel_aes_ctr_transfer(struct atmel_aes_dev *dd) { struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx); struct skcipher_request *req = skcipher_request_cast(dd->areq); struct scatterlist *src, *dst; size_t datalen; u32 ctr; u16 start, end; bool use_dma, fragmented = false; /* Check for transfer completion. */ ctx->offset += dd->total; if (ctx->offset >= req->cryptlen) return atmel_aes_transfer_complete(dd); /* Compute data length. */ datalen = req->cryptlen - ctx->offset; ctx->blocks = DIV_ROUND_UP(datalen, AES_BLOCK_SIZE); ctr = be32_to_cpu(ctx->iv[3]); /* Check 16bit counter overflow. */ start = ctr & 0xffff; end = start + ctx->blocks - 1; if (ctx->blocks >> 16 || end < start) { ctr |= 0xffff; datalen = AES_BLOCK_SIZE * (0x10000 - start); fragmented = true; } use_dma = (datalen >= ATMEL_AES_DMA_THRESHOLD); /* Jump to offset. */ src = scatterwalk_ffwd(ctx->src, req->src, ctx->offset); dst = ((req->src == req->dst) ? src : scatterwalk_ffwd(ctx->dst, req->dst, ctx->offset)); /* Configure hardware. */ atmel_aes_write_ctrl(dd, use_dma, ctx->iv); if (unlikely(fragmented)) { /* * Increment the counter manually to cope with the hardware * counter overflow. */ ctx->iv[3] = cpu_to_be32(ctr); crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE); } if (use_dma) return atmel_aes_dma_start(dd, src, dst, datalen, atmel_aes_ctr_transfer); return atmel_aes_cpu_start(dd, src, dst, datalen, atmel_aes_ctr_transfer); } static int atmel_aes_ctr_start(struct atmel_aes_dev *dd) { struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx); struct skcipher_request *req = skcipher_request_cast(dd->areq); struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req); int err; atmel_aes_set_mode(dd, rctx); err = atmel_aes_hw_init(dd); if (err) return atmel_aes_complete(dd, err); memcpy(ctx->iv, req->iv, AES_BLOCK_SIZE); ctx->offset = 0; dd->total = 0; return atmel_aes_ctr_transfer(dd); } static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode) { struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(skcipher); struct atmel_aes_reqctx *rctx; struct atmel_aes_dev *dd; switch (mode & AES_FLAGS_OPMODE_MASK) { case AES_FLAGS_CFB8: ctx->block_size = CFB8_BLOCK_SIZE; break; case AES_FLAGS_CFB16: ctx->block_size = CFB16_BLOCK_SIZE; break; case AES_FLAGS_CFB32: ctx->block_size = CFB32_BLOCK_SIZE; break; case AES_FLAGS_CFB64: ctx->block_size = CFB64_BLOCK_SIZE; break; default: ctx->block_size = AES_BLOCK_SIZE; break; } ctx->is_aead = false; dd = atmel_aes_find_dev(ctx); if (!dd) return -ENODEV; rctx = skcipher_request_ctx(req); rctx->mode = mode; if ((mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB && !(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) { unsigned int ivsize = crypto_skcipher_ivsize(skcipher); if (req->cryptlen >= ivsize) scatterwalk_map_and_copy(rctx->lastc, req->src, req->cryptlen - ivsize, ivsize, 0); } return atmel_aes_handle_queue(dd, &req->base); } static int atmel_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(tfm); if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256) return -EINVAL; memcpy(ctx->key, key, keylen); ctx->keylen = keylen; return 0; } static int atmel_aes_ecb_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_ECB | AES_FLAGS_ENCRYPT); } static int atmel_aes_ecb_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_ECB); } static int atmel_aes_cbc_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT); } static int atmel_aes_cbc_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CBC); } static int atmel_aes_ofb_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_OFB | AES_FLAGS_ENCRYPT); } static int atmel_aes_ofb_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_OFB); } static int atmel_aes_cfb_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB128 | AES_FLAGS_ENCRYPT); } static int atmel_aes_cfb_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB128); } static int atmel_aes_cfb64_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB64 | AES_FLAGS_ENCRYPT); } static int atmel_aes_cfb64_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB64); } static int atmel_aes_cfb32_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB32 | AES_FLAGS_ENCRYPT); } static int atmel_aes_cfb32_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB32); } static int atmel_aes_cfb16_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB16 | AES_FLAGS_ENCRYPT); } static int atmel_aes_cfb16_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB16); } static int atmel_aes_cfb8_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB8 | AES_FLAGS_ENCRYPT); } static int atmel_aes_cfb8_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CFB8); } static int atmel_aes_ctr_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CTR | AES_FLAGS_ENCRYPT); } static int atmel_aes_ctr_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_CTR); } static int atmel_aes_init_tfm(struct crypto_skcipher *tfm) { struct atmel_aes_ctx *ctx = crypto_skcipher_ctx(tfm); crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx)); ctx->base.start = atmel_aes_start; return 0; } static int atmel_aes_ctr_init_tfm(struct crypto_skcipher *tfm) { struct atmel_aes_ctx *ctx = crypto_skcipher_ctx(tfm); crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx)); ctx->base.start = atmel_aes_ctr_start; return 0; } static struct skcipher_alg aes_algs[] = { { .base.cra_name = "ecb(aes)", .base.cra_driver_name = "atmel-ecb-aes", .base.cra_blocksize = AES_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_ecb_encrypt, .decrypt = atmel_aes_ecb_decrypt, }, { .base.cra_name = "cbc(aes)", .base.cra_driver_name = "atmel-cbc-aes", .base.cra_blocksize = AES_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cbc_encrypt, .decrypt = atmel_aes_cbc_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "ofb(aes)", .base.cra_driver_name = "atmel-ofb-aes", .base.cra_blocksize = AES_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_ofb_encrypt, .decrypt = atmel_aes_ofb_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "cfb(aes)", .base.cra_driver_name = "atmel-cfb-aes", .base.cra_blocksize = AES_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cfb_encrypt, .decrypt = atmel_aes_cfb_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "cfb32(aes)", .base.cra_driver_name = "atmel-cfb32-aes", .base.cra_blocksize = CFB32_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cfb32_encrypt, .decrypt = atmel_aes_cfb32_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "cfb16(aes)", .base.cra_driver_name = "atmel-cfb16-aes", .base.cra_blocksize = CFB16_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cfb16_encrypt, .decrypt = atmel_aes_cfb16_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "cfb8(aes)", .base.cra_driver_name = "atmel-cfb8-aes", .base.cra_blocksize = CFB8_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cfb8_encrypt, .decrypt = atmel_aes_cfb8_decrypt, .ivsize = AES_BLOCK_SIZE, }, { .base.cra_name = "ctr(aes)", .base.cra_driver_name = "atmel-ctr-aes", .base.cra_blocksize = 1, .base.cra_ctxsize = sizeof(struct atmel_aes_ctr_ctx), .init = atmel_aes_ctr_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_ctr_encrypt, .decrypt = atmel_aes_ctr_decrypt, .ivsize = AES_BLOCK_SIZE, }, }; static struct skcipher_alg aes_cfb64_alg = { .base.cra_name = "cfb64(aes)", .base.cra_driver_name = "atmel-cfb64-aes", .base.cra_blocksize = CFB64_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_ctx), .init = atmel_aes_init_tfm, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = atmel_aes_setkey, .encrypt = atmel_aes_cfb64_encrypt, .decrypt = atmel_aes_cfb64_decrypt, .ivsize = AES_BLOCK_SIZE, }; /* gcm aead functions */ static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd, const u32 *data, size_t datalen, const __be32 *ghash_in, __be32 *ghash_out, atmel_aes_fn_t resume); static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd); static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd); static int atmel_aes_gcm_start(struct atmel_aes_dev *dd); static int atmel_aes_gcm_process(struct atmel_aes_dev *dd); static int atmel_aes_gcm_length(struct atmel_aes_dev *dd); static int atmel_aes_gcm_data(struct atmel_aes_dev *dd); static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd); static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd); static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd); static inline struct atmel_aes_gcm_ctx * atmel_aes_gcm_ctx_cast(struct atmel_aes_base_ctx *ctx) { return container_of(ctx, struct atmel_aes_gcm_ctx, base); } static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd, const u32 *data, size_t datalen, const __be32 *ghash_in, __be32 *ghash_out, atmel_aes_fn_t resume) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); dd->data = (u32 *)data; dd->datalen = datalen; ctx->ghash_in = ghash_in; ctx->ghash_out = ghash_out; ctx->ghash_resume = resume; atmel_aes_write_ctrl(dd, false, NULL); return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_ghash_init); } static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); /* Set the data length. */ atmel_aes_write(dd, AES_AADLENR, dd->total); atmel_aes_write(dd, AES_CLENR, 0); /* If needed, overwrite the GCM Intermediate Hash Word Registers */ if (ctx->ghash_in) atmel_aes_write_block(dd, AES_GHASHR(0), ctx->ghash_in); return atmel_aes_gcm_ghash_finalize(dd); } static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); u32 isr; /* Write data into the Input Data Registers. */ while (dd->datalen > 0) { atmel_aes_write_block(dd, AES_IDATAR(0), dd->data); dd->data += 4; dd->datalen -= AES_BLOCK_SIZE; isr = atmel_aes_read(dd, AES_ISR); if (!(isr & AES_INT_DATARDY)) { dd->resume = atmel_aes_gcm_ghash_finalize; atmel_aes_write(dd, AES_IER, AES_INT_DATARDY); return -EINPROGRESS; } } /* Read the computed hash from GHASHRx. */ atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash_out); return ctx->ghash_resume(dd); } static int atmel_aes_gcm_start(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct atmel_aes_reqctx *rctx = aead_request_ctx(req); size_t ivsize = crypto_aead_ivsize(tfm); size_t datalen, padlen; const void *iv = req->iv; u8 *data = dd->buf; int err; atmel_aes_set_mode(dd, rctx); err = atmel_aes_hw_init(dd); if (err) return atmel_aes_complete(dd, err); if (likely(ivsize == GCM_AES_IV_SIZE)) { memcpy(ctx->j0, iv, ivsize); ctx->j0[3] = cpu_to_be32(1); return atmel_aes_gcm_process(dd); } padlen = atmel_aes_padlen(ivsize, AES_BLOCK_SIZE); datalen = ivsize + padlen + AES_BLOCK_SIZE; if (datalen > dd->buflen) return atmel_aes_complete(dd, -EINVAL); memcpy(data, iv, ivsize); memset(data + ivsize, 0, padlen + sizeof(u64)); ((__be64 *)(data + datalen))[-1] = cpu_to_be64(ivsize * 8); return atmel_aes_gcm_ghash(dd, (const u32 *)data, datalen, NULL, ctx->j0, atmel_aes_gcm_process); } static int atmel_aes_gcm_process(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); struct crypto_aead *tfm = crypto_aead_reqtfm(req); bool enc = atmel_aes_is_encrypt(dd); u32 authsize; /* Compute text length. */ authsize = crypto_aead_authsize(tfm); ctx->textlen = req->cryptlen - (enc ? 0 : authsize); /* * According to tcrypt test suite, the GCM Automatic Tag Generation * fails when both the message and its associated data are empty. */ if (likely(req->assoclen != 0 || ctx->textlen != 0)) dd->flags |= AES_FLAGS_GTAGEN; atmel_aes_write_ctrl(dd, false, NULL); return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_length); } static int atmel_aes_gcm_length(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); __be32 j0_lsw, *j0 = ctx->j0; size_t padlen; /* Write incr32(J0) into IV. */ j0_lsw = j0[3]; j0[3] = cpu_to_be32(be32_to_cpu(j0[3]) + 1); atmel_aes_write_block(dd, AES_IVR(0), j0); j0[3] = j0_lsw; /* Set aad and text lengths. */ atmel_aes_write(dd, AES_AADLENR, req->assoclen); atmel_aes_write(dd, AES_CLENR, ctx->textlen); /* Check whether AAD are present. */ if (unlikely(req->assoclen == 0)) { dd->datalen = 0; return atmel_aes_gcm_data(dd); } /* Copy assoc data and add padding. */ padlen = atmel_aes_padlen(req->assoclen, AES_BLOCK_SIZE); if (unlikely(req->assoclen + padlen > dd->buflen)) return atmel_aes_complete(dd, -EINVAL); sg_copy_to_buffer(req->src, sg_nents(req->src), dd->buf, req->assoclen); /* Write assoc data into the Input Data register. */ dd->data = (u32 *)dd->buf; dd->datalen = req->assoclen + padlen; return atmel_aes_gcm_data(dd); } static int atmel_aes_gcm_data(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); bool use_dma = (ctx->textlen >= ATMEL_AES_DMA_THRESHOLD); struct scatterlist *src, *dst; u32 isr, mr; /* Write AAD first. */ while (dd->datalen > 0) { atmel_aes_write_block(dd, AES_IDATAR(0), dd->data); dd->data += 4; dd->datalen -= AES_BLOCK_SIZE; isr = atmel_aes_read(dd, AES_ISR); if (!(isr & AES_INT_DATARDY)) { dd->resume = atmel_aes_gcm_data; atmel_aes_write(dd, AES_IER, AES_INT_DATARDY); return -EINPROGRESS; } } /* GMAC only. */ if (unlikely(ctx->textlen == 0)) return atmel_aes_gcm_tag_init(dd); /* Prepare src and dst scatter lists to transfer cipher/plain texts */ src = scatterwalk_ffwd(ctx->src, req->src, req->assoclen); dst = ((req->src == req->dst) ? src : scatterwalk_ffwd(ctx->dst, req->dst, req->assoclen)); if (use_dma) { /* Update the Mode Register for DMA transfers. */ mr = atmel_aes_read(dd, AES_MR); mr &= ~(AES_MR_SMOD_MASK | AES_MR_DUALBUFF); mr |= AES_MR_SMOD_IDATAR0; if (dd->caps.has_dualbuff) mr |= AES_MR_DUALBUFF; atmel_aes_write(dd, AES_MR, mr); return atmel_aes_dma_start(dd, src, dst, ctx->textlen, atmel_aes_gcm_tag_init); } return atmel_aes_cpu_start(dd, src, dst, ctx->textlen, atmel_aes_gcm_tag_init); } static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); __be64 *data = dd->buf; if (likely(dd->flags & AES_FLAGS_GTAGEN)) { if (!(atmel_aes_read(dd, AES_ISR) & AES_INT_TAGRDY)) { dd->resume = atmel_aes_gcm_tag_init; atmel_aes_write(dd, AES_IER, AES_INT_TAGRDY); return -EINPROGRESS; } return atmel_aes_gcm_finalize(dd); } /* Read the GCM Intermediate Hash Word Registers. */ atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash); data[0] = cpu_to_be64(req->assoclen * 8); data[1] = cpu_to_be64(ctx->textlen * 8); return atmel_aes_gcm_ghash(dd, (const u32 *)data, AES_BLOCK_SIZE, ctx->ghash, ctx->ghash, atmel_aes_gcm_tag); } static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); unsigned long flags; /* * Change mode to CTR to complete the tag generation. * Use J0 as Initialization Vector. */ flags = dd->flags; dd->flags &= ~(AES_FLAGS_OPMODE_MASK | AES_FLAGS_GTAGEN); dd->flags |= AES_FLAGS_CTR; atmel_aes_write_ctrl(dd, false, ctx->j0); dd->flags = flags; atmel_aes_write_block(dd, AES_IDATAR(0), ctx->ghash); return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_finalize); } static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd) { struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx); struct aead_request *req = aead_request_cast(dd->areq); struct crypto_aead *tfm = crypto_aead_reqtfm(req); bool enc = atmel_aes_is_encrypt(dd); u32 offset, authsize, itag[4], *otag = ctx->tag; int err; /* Read the computed tag. */ if (likely(dd->flags & AES_FLAGS_GTAGEN)) atmel_aes_read_block(dd, AES_TAGR(0), ctx->tag); else atmel_aes_read_block(dd, AES_ODATAR(0), ctx->tag); offset = req->assoclen + ctx->textlen; authsize = crypto_aead_authsize(tfm); if (enc) { scatterwalk_map_and_copy(otag, req->dst, offset, authsize, 1); err = 0; } else { scatterwalk_map_and_copy(itag, req->src, offset, authsize, 0); err = crypto_memneq(itag, otag, authsize) ? -EBADMSG : 0; } return atmel_aes_complete(dd, err); } static int atmel_aes_gcm_crypt(struct aead_request *req, unsigned long mode) { struct atmel_aes_base_ctx *ctx; struct atmel_aes_reqctx *rctx; struct atmel_aes_dev *dd; ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); ctx->block_size = AES_BLOCK_SIZE; ctx->is_aead = true; dd = atmel_aes_find_dev(ctx); if (!dd) return -ENODEV; rctx = aead_request_ctx(req); rctx->mode = AES_FLAGS_GCM | mode; return atmel_aes_handle_queue(dd, &req->base); } static int atmel_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm); if (keylen != AES_KEYSIZE_256 && keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) return -EINVAL; memcpy(ctx->key, key, keylen); ctx->keylen = keylen; return 0; } static int atmel_aes_gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize) { return crypto_gcm_check_authsize(authsize); } static int atmel_aes_gcm_encrypt(struct aead_request *req) { return atmel_aes_gcm_crypt(req, AES_FLAGS_ENCRYPT); } static int atmel_aes_gcm_decrypt(struct aead_request *req) { return atmel_aes_gcm_crypt(req, 0); } static int atmel_aes_gcm_init(struct crypto_aead *tfm) { struct atmel_aes_gcm_ctx *ctx = crypto_aead_ctx(tfm); crypto_aead_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx)); ctx->base.start = atmel_aes_gcm_start; return 0; } static struct aead_alg aes_gcm_alg = { .setkey = atmel_aes_gcm_setkey, .setauthsize = atmel_aes_gcm_setauthsize, .encrypt = atmel_aes_gcm_encrypt, .decrypt = atmel_aes_gcm_decrypt, .init = atmel_aes_gcm_init, .ivsize = GCM_AES_IV_SIZE, .maxauthsize = AES_BLOCK_SIZE, .base = { .cra_name = "gcm(aes)", .cra_driver_name = "atmel-gcm-aes", .cra_blocksize = 1, .cra_ctxsize = sizeof(struct atmel_aes_gcm_ctx), }, }; /* xts functions */ static inline struct atmel_aes_xts_ctx * atmel_aes_xts_ctx_cast(struct atmel_aes_base_ctx *ctx) { return container_of(ctx, struct atmel_aes_xts_ctx, base); } static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd); static int atmel_aes_xts_start(struct atmel_aes_dev *dd) { struct atmel_aes_xts_ctx *ctx = atmel_aes_xts_ctx_cast(dd->ctx); struct skcipher_request *req = skcipher_request_cast(dd->areq); struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req); unsigned long flags; int err; atmel_aes_set_mode(dd, rctx); err = atmel_aes_hw_init(dd); if (err) return atmel_aes_complete(dd, err); /* Compute the tweak value from req->iv with ecb(aes). */ flags = dd->flags; dd->flags &= ~AES_FLAGS_MODE_MASK; dd->flags |= (AES_FLAGS_ECB | AES_FLAGS_ENCRYPT); atmel_aes_write_ctrl_key(dd, false, NULL, ctx->key2, ctx->base.keylen); dd->flags = flags; atmel_aes_write_block(dd, AES_IDATAR(0), req->iv); return atmel_aes_wait_for_data_ready(dd, atmel_aes_xts_process_data); } static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd) { struct skcipher_request *req = skcipher_request_cast(dd->areq); bool use_dma = (req->cryptlen >= ATMEL_AES_DMA_THRESHOLD); u32 tweak[AES_BLOCK_SIZE / sizeof(u32)]; static const __le32 one[AES_BLOCK_SIZE / sizeof(u32)] = {cpu_to_le32(1), }; u8 *tweak_bytes = (u8 *)tweak; int i; /* Read the computed ciphered tweak value. */ atmel_aes_read_block(dd, AES_ODATAR(0), tweak); /* * Hardware quirk: * the order of the ciphered tweak bytes need to be reversed before * writing them into the ODATARx registers. */ for (i = 0; i < AES_BLOCK_SIZE/2; ++i) { u8 tmp = tweak_bytes[AES_BLOCK_SIZE - 1 - i]; tweak_bytes[AES_BLOCK_SIZE - 1 - i] = tweak_bytes[i]; tweak_bytes[i] = tmp; } /* Process the data. */ atmel_aes_write_ctrl(dd, use_dma, NULL); atmel_aes_write_block(dd, AES_TWR(0), tweak); atmel_aes_write_block(dd, AES_ALPHAR(0), one); if (use_dma) return atmel_aes_dma_start(dd, req->src, req->dst, req->cryptlen, atmel_aes_transfer_complete); return atmel_aes_cpu_start(dd, req->src, req->dst, req->cryptlen, atmel_aes_transfer_complete); } static int atmel_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); int err; err = xts_check_key(crypto_skcipher_tfm(tfm), key, keylen); if (err) return err; memcpy(ctx->base.key, key, keylen/2); memcpy(ctx->key2, key + keylen/2, keylen/2); ctx->base.keylen = keylen/2; return 0; } static int atmel_aes_xts_encrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_XTS | AES_FLAGS_ENCRYPT); } static int atmel_aes_xts_decrypt(struct skcipher_request *req) { return atmel_aes_crypt(req, AES_FLAGS_XTS); } static int atmel_aes_xts_init_tfm(struct crypto_skcipher *tfm) { struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx)); ctx->base.start = atmel_aes_xts_start; return 0; } static struct skcipher_alg aes_xts_alg = { .base.cra_name = "xts(aes)", .base.cra_driver_name = "atmel-xts-aes", .base.cra_blocksize = AES_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct atmel_aes_xts_ctx), .min_keysize = 2 * AES_MIN_KEY_SIZE, .max_keysize = 2 * AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = atmel_aes_xts_setkey, .encrypt = atmel_aes_xts_encrypt, .decrypt = atmel_aes_xts_decrypt, .init = atmel_aes_xts_init_tfm, }; #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) /* authenc aead functions */ static int atmel_aes_authenc_start(struct atmel_aes_dev *dd); static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err, bool is_async); static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err, bool is_async); static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd); static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err, bool is_async); static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); if (err && (dd->flags & AES_FLAGS_OWN_SHA)) atmel_sha_authenc_abort(&rctx->auth_req); dd->flags &= ~AES_FLAGS_OWN_SHA; } static int atmel_aes_authenc_start(struct atmel_aes_dev *dd) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm); int err; atmel_aes_set_mode(dd, &rctx->base); err = atmel_aes_hw_init(dd); if (err) return atmel_aes_complete(dd, err); return atmel_sha_authenc_schedule(&rctx->auth_req, ctx->auth, atmel_aes_authenc_init, dd); } static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err, bool is_async) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); if (is_async) dd->is_async = true; if (err) return atmel_aes_complete(dd, err); /* If here, we've got the ownership of the SHA device. */ dd->flags |= AES_FLAGS_OWN_SHA; /* Configure the SHA device. */ return atmel_sha_authenc_init(&rctx->auth_req, req->src, req->assoclen, rctx->textlen, atmel_aes_authenc_transfer, dd); } static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err, bool is_async) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); bool enc = atmel_aes_is_encrypt(dd); struct scatterlist *src, *dst; __be32 iv[AES_BLOCK_SIZE / sizeof(u32)]; u32 emr; if (is_async) dd->is_async = true; if (err) return atmel_aes_complete(dd, err); /* Prepare src and dst scatter-lists to transfer cipher/plain texts. */ src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); dst = src; if (req->src != req->dst) dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); /* Configure the AES device. */ memcpy(iv, req->iv, sizeof(iv)); /* * Here we always set the 2nd parameter of atmel_aes_write_ctrl() to * 'true' even if the data transfer is actually performed by the CPU (so * not by the DMA) because we must force the AES_MR_SMOD bitfield to the * value AES_MR_SMOD_IDATAR0. Indeed, both AES_MR_SMOD and SHA_MR_SMOD * must be set to *_MR_SMOD_IDATAR0. */ atmel_aes_write_ctrl(dd, true, iv); emr = AES_EMR_PLIPEN; if (!enc) emr |= AES_EMR_PLIPD; atmel_aes_write(dd, AES_EMR, emr); /* Transfer data. */ return atmel_aes_dma_start(dd, src, dst, rctx->textlen, atmel_aes_authenc_digest); } static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); /* atmel_sha_authenc_final() releases the SHA device. */ dd->flags &= ~AES_FLAGS_OWN_SHA; return atmel_sha_authenc_final(&rctx->auth_req, rctx->digest, sizeof(rctx->digest), atmel_aes_authenc_final, dd); } static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err, bool is_async) { struct aead_request *req = aead_request_cast(dd->areq); struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); struct crypto_aead *tfm = crypto_aead_reqtfm(req); bool enc = atmel_aes_is_encrypt(dd); u32 idigest[SHA512_DIGEST_SIZE / sizeof(u32)], *odigest = rctx->digest; u32 offs, authsize; if (is_async) dd->is_async = true; if (err) goto complete; offs = req->assoclen + rctx->textlen; authsize = crypto_aead_authsize(tfm); if (enc) { scatterwalk_map_and_copy(odigest, req->dst, offs, authsize, 1); } else { scatterwalk_map_and_copy(idigest, req->src, offs, authsize, 0); if (crypto_memneq(idigest, odigest, authsize)) err = -EBADMSG; } complete: return atmel_aes_complete(dd, err); } static int atmel_aes_authenc_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen) { struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm); struct crypto_authenc_keys keys; int err; if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) goto badkey; if (keys.enckeylen > sizeof(ctx->base.key)) goto badkey; /* Save auth key. */ err = atmel_sha_authenc_setkey(ctx->auth, keys.authkey, keys.authkeylen, crypto_aead_get_flags(tfm)); if (err) { memzero_explicit(&keys, sizeof(keys)); return err; } /* Save enc key. */ ctx->base.keylen = keys.enckeylen; memcpy(ctx->base.key, keys.enckey, keys.enckeylen); memzero_explicit(&keys, sizeof(keys)); return 0; badkey: memzero_explicit(&keys, sizeof(keys)); return -EINVAL; } static int atmel_aes_authenc_init_tfm(struct crypto_aead *tfm, unsigned long auth_mode) { struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm); unsigned int auth_reqsize = atmel_sha_authenc_get_reqsize(); ctx->auth = atmel_sha_authenc_spawn(auth_mode); if (IS_ERR(ctx->auth)) return PTR_ERR(ctx->auth); crypto_aead_set_reqsize(tfm, (sizeof(struct atmel_aes_authenc_reqctx) + auth_reqsize)); ctx->base.start = atmel_aes_authenc_start; return 0; } static int atmel_aes_authenc_hmac_sha1_init_tfm(struct crypto_aead *tfm) { return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA1); } static int atmel_aes_authenc_hmac_sha224_init_tfm(struct crypto_aead *tfm) { return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA224); } static int atmel_aes_authenc_hmac_sha256_init_tfm(struct crypto_aead *tfm) { return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA256); } static int atmel_aes_authenc_hmac_sha384_init_tfm(struct crypto_aead *tfm) { return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA384); } static int atmel_aes_authenc_hmac_sha512_init_tfm(struct crypto_aead *tfm) { return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA512); } static void atmel_aes_authenc_exit_tfm(struct crypto_aead *tfm) { struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm); atmel_sha_authenc_free(ctx->auth); } static int atmel_aes_authenc_crypt(struct aead_request *req, unsigned long mode) { struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req); struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm); u32 authsize = crypto_aead_authsize(tfm); bool enc = (mode & AES_FLAGS_ENCRYPT); struct atmel_aes_dev *dd; /* Compute text length. */ if (!enc && req->cryptlen < authsize) return -EINVAL; rctx->textlen = req->cryptlen - (enc ? 0 : authsize); /* * Currently, empty messages are not supported yet: * the SHA auto-padding can be used only on non-empty messages. * Hence a special case needs to be implemented for empty message. */ if (!rctx->textlen && !req->assoclen) return -EINVAL; rctx->base.mode = mode; ctx->block_size = AES_BLOCK_SIZE; ctx->is_aead = true; dd = atmel_aes_find_dev(ctx); if (!dd) return -ENODEV; return atmel_aes_handle_queue(dd, &req->base); } static int atmel_aes_authenc_cbc_aes_encrypt(struct aead_request *req) { return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT); } static int atmel_aes_authenc_cbc_aes_decrypt(struct aead_request *req) { return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC); } static struct aead_alg aes_authenc_algs[] = { { .setkey = atmel_aes_authenc_setkey, .encrypt = atmel_aes_authenc_cbc_aes_encrypt, .decrypt = atmel_aes_authenc_cbc_aes_decrypt, .init = atmel_aes_authenc_hmac_sha1_init_tfm, .exit = atmel_aes_authenc_exit_tfm, .ivsize = AES_BLOCK_SIZE, .maxauthsize = SHA1_DIGEST_SIZE, .base = { .cra_name = "authenc(hmac(sha1),cbc(aes))", .cra_driver_name = "atmel-authenc-hmac-sha1-cbc-aes", .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct atmel_aes_authenc_ctx), }, }, { .setkey = atmel_aes_authenc_setkey, .encrypt = atmel_aes_authenc_cbc_aes_encrypt, .decrypt = atmel_aes_authenc_cbc_aes_decrypt, .init = atmel_aes_authenc_hmac_sha224_init_tfm, .exit = atmel_aes_authenc_exit_tfm, .ivsize = AES_BLOCK_SIZE, .maxauthsize = SHA224_DIGEST_SIZE, .base = { .cra_name = "authenc(hmac(sha224),cbc(aes))", .cra_driver_name = "atmel-authenc-hmac-sha224-cbc-aes", .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct atmel_aes_authenc_ctx), }, }, { .setkey = atmel_aes_authenc_setkey, .encrypt = atmel_aes_authenc_cbc_aes_encrypt, .decrypt = atmel_aes_authenc_cbc_aes_decrypt, .init = atmel_aes_authenc_hmac_sha256_init_tfm, .exit = atmel_aes_authenc_exit_tfm, .ivsize = AES_BLOCK_SIZE, .maxauthsize = SHA256_DIGEST_SIZE, .base = { .cra_name = "authenc(hmac(sha256),cbc(aes))", .cra_driver_name = "atmel-authenc-hmac-sha256-cbc-aes", .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct atmel_aes_authenc_ctx), }, }, { .setkey = atmel_aes_authenc_setkey, .encrypt = atmel_aes_authenc_cbc_aes_encrypt, .decrypt = atmel_aes_authenc_cbc_aes_decrypt, .init = atmel_aes_authenc_hmac_sha384_init_tfm, .exit = atmel_aes_authenc_exit_tfm, .ivsize = AES_BLOCK_SIZE, .maxauthsize = SHA384_DIGEST_SIZE, .base = { .cra_name = "authenc(hmac(sha384),cbc(aes))", .cra_driver_name = "atmel-authenc-hmac-sha384-cbc-aes", .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct atmel_aes_authenc_ctx), }, }, { .setkey = atmel_aes_authenc_setkey, .encrypt = atmel_aes_authenc_cbc_aes_encrypt, .decrypt = atmel_aes_authenc_cbc_aes_decrypt, .init = atmel_aes_authenc_hmac_sha512_init_tfm, .exit = atmel_aes_authenc_exit_tfm, .ivsize = AES_BLOCK_SIZE, .maxauthsize = SHA512_DIGEST_SIZE, .base = { .cra_name = "authenc(hmac(sha512),cbc(aes))", .cra_driver_name = "atmel-authenc-hmac-sha512-cbc-aes", .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct atmel_aes_authenc_ctx), }, }, }; #endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */ /* Probe functions */ static int atmel_aes_buff_init(struct atmel_aes_dev *dd) { dd->buf = (void *)__get_free_pages(GFP_KERNEL, ATMEL_AES_BUFFER_ORDER); dd->buflen = ATMEL_AES_BUFFER_SIZE; dd->buflen &= ~(AES_BLOCK_SIZE - 1); if (!dd->buf) { dev_err(dd->dev, "unable to alloc pages.\n"); return -ENOMEM; } return 0; } static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd) { free_page((unsigned long)dd->buf); } static int atmel_aes_dma_init(struct atmel_aes_dev *dd) { int ret; /* Try to grab 2 DMA channels */ dd->src.chan = dma_request_chan(dd->dev, "tx"); if (IS_ERR(dd->src.chan)) { ret = PTR_ERR(dd->src.chan); goto err_dma_in; } dd->dst.chan = dma_request_chan(dd->dev, "rx"); if (IS_ERR(dd->dst.chan)) { ret = PTR_ERR(dd->dst.chan); goto err_dma_out; } return 0; err_dma_out: dma_release_channel(dd->src.chan); err_dma_in: dev_err(dd->dev, "no DMA channel available\n"); return ret; } static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd) { dma_release_channel(dd->dst.chan); dma_release_channel(dd->src.chan); } static void atmel_aes_queue_task(unsigned long data) { struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data; atmel_aes_handle_queue(dd, NULL); } static void atmel_aes_done_task(unsigned long data) { struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data; dd->is_async = true; (void)dd->resume(dd); } static irqreturn_t atmel_aes_irq(int irq, void *dev_id) { struct atmel_aes_dev *aes_dd = dev_id; u32 reg; reg = atmel_aes_read(aes_dd, AES_ISR); if (reg & atmel_aes_read(aes_dd, AES_IMR)) { atmel_aes_write(aes_dd, AES_IDR, reg); if (AES_FLAGS_BUSY & aes_dd->flags) tasklet_schedule(&aes_dd->done_task); else dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n"); return IRQ_HANDLED; } return IRQ_NONE; } static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd) { int i; #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) if (dd->caps.has_authenc) for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++) crypto_unregister_aead(&aes_authenc_algs[i]); #endif if (dd->caps.has_xts) crypto_unregister_skcipher(&aes_xts_alg); if (dd->caps.has_gcm) crypto_unregister_aead(&aes_gcm_alg); if (dd->caps.has_cfb64) crypto_unregister_skcipher(&aes_cfb64_alg); for (i = 0; i < ARRAY_SIZE(aes_algs); i++) crypto_unregister_skcipher(&aes_algs[i]); } static void atmel_aes_crypto_alg_init(struct crypto_alg *alg) { alg->cra_flags = CRYPTO_ALG_ASYNC; alg->cra_alignmask = 0xf; alg->cra_priority = ATMEL_AES_PRIORITY; alg->cra_module = THIS_MODULE; } static int atmel_aes_register_algs(struct atmel_aes_dev *dd) { int err, i, j; for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { atmel_aes_crypto_alg_init(&aes_algs[i].base); err = crypto_register_skcipher(&aes_algs[i]); if (err) goto err_aes_algs; } if (dd->caps.has_cfb64) { atmel_aes_crypto_alg_init(&aes_cfb64_alg.base); err = crypto_register_skcipher(&aes_cfb64_alg); if (err) goto err_aes_cfb64_alg; } if (dd->caps.has_gcm) { atmel_aes_crypto_alg_init(&aes_gcm_alg.base); err = crypto_register_aead(&aes_gcm_alg); if (err) goto err_aes_gcm_alg; } if (dd->caps.has_xts) { atmel_aes_crypto_alg_init(&aes_xts_alg.base); err = crypto_register_skcipher(&aes_xts_alg); if (err) goto err_aes_xts_alg; } #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) if (dd->caps.has_authenc) { for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++) { atmel_aes_crypto_alg_init(&aes_authenc_algs[i].base); err = crypto_register_aead(&aes_authenc_algs[i]); if (err) goto err_aes_authenc_alg; } } #endif return 0; #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) /* i = ARRAY_SIZE(aes_authenc_algs); */ err_aes_authenc_alg: for (j = 0; j < i; j++) crypto_unregister_aead(&aes_authenc_algs[j]); crypto_unregister_skcipher(&aes_xts_alg); #endif err_aes_xts_alg: crypto_unregister_aead(&aes_gcm_alg); err_aes_gcm_alg: crypto_unregister_skcipher(&aes_cfb64_alg); err_aes_cfb64_alg: i = ARRAY_SIZE(aes_algs); err_aes_algs: for (j = 0; j < i; j++) crypto_unregister_skcipher(&aes_algs[j]); return err; } static void atmel_aes_get_cap(struct atmel_aes_dev *dd) { dd->caps.has_dualbuff = 0; dd->caps.has_cfb64 = 0; dd->caps.has_gcm = 0; dd->caps.has_xts = 0; dd->caps.has_authenc = 0; dd->caps.max_burst_size = 1; /* keep only major version number */ switch (dd->hw_version & 0xff0) { case 0x500: dd->caps.has_dualbuff = 1; dd->caps.has_cfb64 = 1; dd->caps.has_gcm = 1; dd->caps.has_xts = 1; dd->caps.has_authenc = 1; dd->caps.max_burst_size = 4; break; case 0x200: dd->caps.has_dualbuff = 1; dd->caps.has_cfb64 = 1; dd->caps.has_gcm = 1; dd->caps.max_burst_size = 4; break; case 0x130: dd->caps.has_dualbuff = 1; dd->caps.has_cfb64 = 1; dd->caps.max_burst_size = 4; break; case 0x120: break; default: dev_warn(dd->dev, "Unmanaged aes version, set minimum capabilities\n"); break; } } #if defined(CONFIG_OF) static const struct of_device_id atmel_aes_dt_ids[] = { { .compatible = "atmel,at91sam9g46-aes" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids); #endif static int atmel_aes_probe(struct platform_device *pdev) { struct atmel_aes_dev *aes_dd; struct device *dev = &pdev->dev; struct resource *aes_res; int err; aes_dd = devm_kzalloc(&pdev->dev, sizeof(*aes_dd), GFP_KERNEL); if (!aes_dd) return -ENOMEM; aes_dd->dev = dev; platform_set_drvdata(pdev, aes_dd); INIT_LIST_HEAD(&aes_dd->list); spin_lock_init(&aes_dd->lock); tasklet_init(&aes_dd->done_task, atmel_aes_done_task, (unsigned long)aes_dd); tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task, (unsigned long)aes_dd); crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH); /* Get the base address */ aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!aes_res) { dev_err(dev, "no MEM resource info\n"); err = -ENODEV; goto err_tasklet_kill; } aes_dd->phys_base = aes_res->start; /* Get the IRQ */ aes_dd->irq = platform_get_irq(pdev, 0); if (aes_dd->irq < 0) { err = aes_dd->irq; goto err_tasklet_kill; } err = devm_request_irq(&pdev->dev, aes_dd->irq, atmel_aes_irq, IRQF_SHARED, "atmel-aes", aes_dd); if (err) { dev_err(dev, "unable to request aes irq.\n"); goto err_tasklet_kill; } /* Initializing the clock */ aes_dd->iclk = devm_clk_get(&pdev->dev, "aes_clk"); if (IS_ERR(aes_dd->iclk)) { dev_err(dev, "clock initialization failed.\n"); err = PTR_ERR(aes_dd->iclk); goto err_tasklet_kill; } aes_dd->io_base = devm_ioremap_resource(&pdev->dev, aes_res); if (IS_ERR(aes_dd->io_base)) { dev_err(dev, "can't ioremap\n"); err = PTR_ERR(aes_dd->io_base); goto err_tasklet_kill; } err = clk_prepare(aes_dd->iclk); if (err) goto err_tasklet_kill; err = atmel_aes_hw_version_init(aes_dd); if (err) goto err_iclk_unprepare; atmel_aes_get_cap(aes_dd); #if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC) if (aes_dd->caps.has_authenc && !atmel_sha_authenc_is_ready()) { err = -EPROBE_DEFER; goto err_iclk_unprepare; } #endif err = atmel_aes_buff_init(aes_dd); if (err) goto err_iclk_unprepare; err = atmel_aes_dma_init(aes_dd); if (err) goto err_buff_cleanup; spin_lock(&atmel_aes.lock); list_add_tail(&aes_dd->list, &atmel_aes.dev_list); spin_unlock(&atmel_aes.lock); err = atmel_aes_register_algs(aes_dd); if (err) goto err_algs; dev_info(dev, "Atmel AES - Using %s, %s for DMA transfers\n", dma_chan_name(aes_dd->src.chan), dma_chan_name(aes_dd->dst.chan)); return 0; err_algs: spin_lock(&atmel_aes.lock); list_del(&aes_dd->list); spin_unlock(&atmel_aes.lock); atmel_aes_dma_cleanup(aes_dd); err_buff_cleanup: atmel_aes_buff_cleanup(aes_dd); err_iclk_unprepare: clk_unprepare(aes_dd->iclk); err_tasklet_kill: tasklet_kill(&aes_dd->done_task); tasklet_kill(&aes_dd->queue_task); return err; } static int atmel_aes_remove(struct platform_device *pdev) { struct atmel_aes_dev *aes_dd; aes_dd = platform_get_drvdata(pdev); if (!aes_dd) return -ENODEV; spin_lock(&atmel_aes.lock); list_del(&aes_dd->list); spin_unlock(&atmel_aes.lock); atmel_aes_unregister_algs(aes_dd); tasklet_kill(&aes_dd->done_task); tasklet_kill(&aes_dd->queue_task); atmel_aes_dma_cleanup(aes_dd); atmel_aes_buff_cleanup(aes_dd); clk_unprepare(aes_dd->iclk); return 0; } static struct platform_driver atmel_aes_driver = { .probe = atmel_aes_probe, .remove = atmel_aes_remove, .driver = { .name = "atmel_aes", .of_match_table = of_match_ptr(atmel_aes_dt_ids), }, }; module_platform_driver(atmel_aes_driver); MODULE_DESCRIPTION("Atmel AES hw acceleration support."); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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