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drivers/crypto/mxs-dcp.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Freescale i.MX23/i.MX28 Data Co-Processor driver * * Copyright (C) 2013 Marek Vasut <marex@denx.de> |
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*/ |
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#include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/kthread.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/stmp_device.h> |
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#include <linux/clk.h> |
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#include <crypto/aes.h> #include <crypto/sha.h> #include <crypto/internal/hash.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#define DCP_MAX_CHANS 4 #define DCP_BUF_SZ PAGE_SIZE |
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#define DCP_SHA_PAY_SZ 64 |
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#define DCP_ALIGNMENT 64 |
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/* * Null hashes to align with hw behavior on imx6sl and ull * these are flipped for consistency with hw output */ |
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static const uint8_t sha1_null_hash[] = |
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"\x09\x07\xd8\xaf\x90\x18\x60\x95\xef\xbf" "\x55\x32\x0d\x4b\x6b\x5e\xee\xa3\x39\xda"; |
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static const uint8_t sha256_null_hash[] = |
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"\x55\xb8\x52\x78\x1b\x99\x95\xa4" "\x4c\x93\x9b\x64\xe4\x41\xae\x27" "\x24\xb9\x6f\x99\xc8\xf4\xfb\x9a" "\x14\x1c\xfc\x98\x42\xc4\xb0\xe3"; |
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/* DCP DMA descriptor. */ struct dcp_dma_desc { uint32_t next_cmd_addr; uint32_t control0; uint32_t control1; uint32_t source; uint32_t destination; uint32_t size; uint32_t payload; uint32_t status; }; /* Coherent aligned block for bounce buffering. */ struct dcp_coherent_block { uint8_t aes_in_buf[DCP_BUF_SZ]; uint8_t aes_out_buf[DCP_BUF_SZ]; uint8_t sha_in_buf[DCP_BUF_SZ]; |
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uint8_t sha_out_buf[DCP_SHA_PAY_SZ]; |
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uint8_t aes_key[2 * AES_KEYSIZE_128]; |
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struct dcp_dma_desc desc[DCP_MAX_CHANS]; }; struct dcp { struct device *dev; void __iomem *base; uint32_t caps; struct dcp_coherent_block *coh; struct completion completion[DCP_MAX_CHANS]; |
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spinlock_t lock[DCP_MAX_CHANS]; |
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struct task_struct *thread[DCP_MAX_CHANS]; struct crypto_queue queue[DCP_MAX_CHANS]; |
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struct clk *dcp_clk; |
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}; enum dcp_chan { DCP_CHAN_HASH_SHA = 0, DCP_CHAN_CRYPTO = 2, }; struct dcp_async_ctx { /* Common context */ enum dcp_chan chan; uint32_t fill; /* SHA Hash-specific context */ struct mutex mutex; uint32_t alg; unsigned int hot:1; /* Crypto-specific context */ |
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struct crypto_sync_skcipher *fallback; |
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unsigned int key_len; uint8_t key[AES_KEYSIZE_128]; }; |
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struct dcp_aes_req_ctx { unsigned int enc:1; unsigned int ecb:1; }; |
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struct dcp_sha_req_ctx { unsigned int init:1; unsigned int fini:1; }; |
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struct dcp_export_state { struct dcp_sha_req_ctx req_ctx; struct dcp_async_ctx async_ctx; }; |
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/* * There can even be only one instance of the MXS DCP due to the * design of Linux Crypto API. */ static struct dcp *global_sdcp; |
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/* DCP register layout. */ #define MXS_DCP_CTRL 0x00 #define MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES (1 << 23) #define MXS_DCP_CTRL_ENABLE_CONTEXT_CACHING (1 << 22) #define MXS_DCP_STAT 0x10 #define MXS_DCP_STAT_CLR 0x18 #define MXS_DCP_STAT_IRQ_MASK 0xf #define MXS_DCP_CHANNELCTRL 0x20 #define MXS_DCP_CHANNELCTRL_ENABLE_CHANNEL_MASK 0xff #define MXS_DCP_CAPABILITY1 0x40 #define MXS_DCP_CAPABILITY1_SHA256 (4 << 16) #define MXS_DCP_CAPABILITY1_SHA1 (1 << 16) #define MXS_DCP_CAPABILITY1_AES128 (1 << 0) #define MXS_DCP_CONTEXT 0x50 #define MXS_DCP_CH_N_CMDPTR(n) (0x100 + ((n) * 0x40)) #define MXS_DCP_CH_N_SEMA(n) (0x110 + ((n) * 0x40)) #define MXS_DCP_CH_N_STAT(n) (0x120 + ((n) * 0x40)) #define MXS_DCP_CH_N_STAT_CLR(n) (0x128 + ((n) * 0x40)) /* DMA descriptor bits. */ #define MXS_DCP_CONTROL0_HASH_TERM (1 << 13) #define MXS_DCP_CONTROL0_HASH_INIT (1 << 12) #define MXS_DCP_CONTROL0_PAYLOAD_KEY (1 << 11) #define MXS_DCP_CONTROL0_CIPHER_ENCRYPT (1 << 8) #define MXS_DCP_CONTROL0_CIPHER_INIT (1 << 9) #define MXS_DCP_CONTROL0_ENABLE_HASH (1 << 6) #define MXS_DCP_CONTROL0_ENABLE_CIPHER (1 << 5) #define MXS_DCP_CONTROL0_DECR_SEMAPHORE (1 << 1) #define MXS_DCP_CONTROL0_INTERRUPT (1 << 0) #define MXS_DCP_CONTROL1_HASH_SELECT_SHA256 (2 << 16) #define MXS_DCP_CONTROL1_HASH_SELECT_SHA1 (0 << 16) #define MXS_DCP_CONTROL1_CIPHER_MODE_CBC (1 << 4) #define MXS_DCP_CONTROL1_CIPHER_MODE_ECB (0 << 4) #define MXS_DCP_CONTROL1_CIPHER_SELECT_AES128 (0 << 0) static int mxs_dcp_start_dma(struct dcp_async_ctx *actx) { struct dcp *sdcp = global_sdcp; const int chan = actx->chan; uint32_t stat; |
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unsigned long ret; |
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struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan]; dma_addr_t desc_phys = dma_map_single(sdcp->dev, desc, sizeof(*desc), DMA_TO_DEVICE); reinit_completion(&sdcp->completion[chan]); /* Clear status register. */ writel(0xffffffff, sdcp->base + MXS_DCP_CH_N_STAT_CLR(chan)); /* Load the DMA descriptor. */ writel(desc_phys, sdcp->base + MXS_DCP_CH_N_CMDPTR(chan)); /* Increment the semaphore to start the DMA transfer. */ writel(1, sdcp->base + MXS_DCP_CH_N_SEMA(chan)); ret = wait_for_completion_timeout(&sdcp->completion[chan], msecs_to_jiffies(1000)); if (!ret) { dev_err(sdcp->dev, "Channel %i timeout (DCP_STAT=0x%08x) ", chan, readl(sdcp->base + MXS_DCP_STAT)); return -ETIMEDOUT; } stat = readl(sdcp->base + MXS_DCP_CH_N_STAT(chan)); if (stat & 0xff) { dev_err(sdcp->dev, "Channel %i error (CH_STAT=0x%08x) ", chan, stat); return -EINVAL; } dma_unmap_single(sdcp->dev, desc_phys, sizeof(*desc), DMA_TO_DEVICE); return 0; } /* * Encryption (AES128) */ |
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static int mxs_dcp_run_aes(struct dcp_async_ctx *actx, struct ablkcipher_request *req, int init) |
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{ struct dcp *sdcp = global_sdcp; struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan]; |
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struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req); |
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int ret; dma_addr_t key_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_key, 2 * AES_KEYSIZE_128, DMA_TO_DEVICE); dma_addr_t src_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_in_buf, DCP_BUF_SZ, DMA_TO_DEVICE); dma_addr_t dst_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_out_buf, DCP_BUF_SZ, DMA_FROM_DEVICE); |
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if (actx->fill % AES_BLOCK_SIZE) { dev_err(sdcp->dev, "Invalid block size! "); ret = -EINVAL; goto aes_done_run; } |
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/* Fill in the DMA descriptor. */ desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE | MXS_DCP_CONTROL0_INTERRUPT | MXS_DCP_CONTROL0_ENABLE_CIPHER; /* Payload contains the key. */ desc->control0 |= MXS_DCP_CONTROL0_PAYLOAD_KEY; |
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if (rctx->enc) |
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desc->control0 |= MXS_DCP_CONTROL0_CIPHER_ENCRYPT; if (init) desc->control0 |= MXS_DCP_CONTROL0_CIPHER_INIT; desc->control1 = MXS_DCP_CONTROL1_CIPHER_SELECT_AES128; |
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if (rctx->ecb) |
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desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_ECB; else desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_CBC; desc->next_cmd_addr = 0; desc->source = src_phys; desc->destination = dst_phys; desc->size = actx->fill; desc->payload = key_phys; desc->status = 0; ret = mxs_dcp_start_dma(actx); |
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aes_done_run: |
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dma_unmap_single(sdcp->dev, key_phys, 2 * AES_KEYSIZE_128, DMA_TO_DEVICE); dma_unmap_single(sdcp->dev, src_phys, DCP_BUF_SZ, DMA_TO_DEVICE); dma_unmap_single(sdcp->dev, dst_phys, DCP_BUF_SZ, DMA_FROM_DEVICE); return ret; } static int mxs_dcp_aes_block_crypt(struct crypto_async_request *arq) { struct dcp *sdcp = global_sdcp; struct ablkcipher_request *req = ablkcipher_request_cast(arq); struct dcp_async_ctx *actx = crypto_tfm_ctx(arq->tfm); |
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struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req); |
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struct scatterlist *dst = req->dst; struct scatterlist *src = req->src; const int nents = sg_nents(req->src); const int out_off = DCP_BUF_SZ; uint8_t *in_buf = sdcp->coh->aes_in_buf; uint8_t *out_buf = sdcp->coh->aes_out_buf; uint8_t *out_tmp, *src_buf, *dst_buf = NULL; uint32_t dst_off = 0; |
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uint32_t last_out_len = 0; |
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uint8_t *key = sdcp->coh->aes_key; int ret = 0; int split = 0; |
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unsigned int i, len, clen, rem = 0, tlen = 0; |
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int init = 0; |
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bool limit_hit = false; |
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if (!req->nbytes) return 0; |
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actx->fill = 0; /* Copy the key from the temporary location. */ memcpy(key, actx->key, actx->key_len); |
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if (!rctx->ecb) { |
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/* Copy the CBC IV just past the key. */ memcpy(key + AES_KEYSIZE_128, req->info, AES_KEYSIZE_128); /* CBC needs the INIT set. */ init = 1; } else { memset(key + AES_KEYSIZE_128, 0, AES_KEYSIZE_128); } for_each_sg(req->src, src, nents, i) { src_buf = sg_virt(src); len = sg_dma_len(src); |
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tlen += len; limit_hit = tlen > req->nbytes; if (limit_hit) len = req->nbytes - (tlen - len); |
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do { if (actx->fill + len > out_off) clen = out_off - actx->fill; else clen = len; memcpy(in_buf + actx->fill, src_buf, clen); len -= clen; src_buf += clen; actx->fill += clen; /* * If we filled the buffer or this is the last SG, * submit the buffer. */ |
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if (actx->fill == out_off || sg_is_last(src) || limit_hit) { |
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ret = mxs_dcp_run_aes(actx, req, init); |
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if (ret) return ret; init = 0; out_tmp = out_buf; |
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last_out_len = actx->fill; |
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while (dst && actx->fill) { if (!split) { dst_buf = sg_virt(dst); dst_off = 0; } rem = min(sg_dma_len(dst) - dst_off, actx->fill); memcpy(dst_buf + dst_off, out_tmp, rem); out_tmp += rem; dst_off += rem; actx->fill -= rem; if (dst_off == sg_dma_len(dst)) { dst = sg_next(dst); split = 0; } else { split = 1; } } } } while (len); |
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if (limit_hit) break; } /* Copy the IV for CBC for chaining */ if (!rctx->ecb) { if (rctx->enc) memcpy(req->info, out_buf+(last_out_len-AES_BLOCK_SIZE), AES_BLOCK_SIZE); else memcpy(req->info, in_buf+(last_out_len-AES_BLOCK_SIZE), AES_BLOCK_SIZE); |
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} return ret; } static int dcp_chan_thread_aes(void *data) { struct dcp *sdcp = global_sdcp; const int chan = DCP_CHAN_CRYPTO; struct crypto_async_request *backlog; struct crypto_async_request *arq; int ret; |
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while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); |
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spin_lock(&sdcp->lock[chan]); |
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backlog = crypto_get_backlog(&sdcp->queue[chan]); arq = crypto_dequeue_request(&sdcp->queue[chan]); |
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spin_unlock(&sdcp->lock[chan]); if (!backlog && !arq) { schedule(); continue; } set_current_state(TASK_RUNNING); |
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if (backlog) backlog->complete(backlog, -EINPROGRESS); if (arq) { ret = mxs_dcp_aes_block_crypt(arq); arq->complete(arq, ret); |
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} |
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} |
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return 0; } static int mxs_dcp_block_fallback(struct ablkcipher_request *req, int enc) { |
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struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); struct dcp_async_ctx *ctx = crypto_ablkcipher_ctx(tfm); |
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SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); |
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int ret; |
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skcipher_request_set_sync_tfm(subreq, ctx->fallback); |
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skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL); skcipher_request_set_crypt(subreq, req->src, req->dst, req->nbytes, req->info); |
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if (enc) |
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ret = crypto_skcipher_encrypt(subreq); |
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else |
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ret = crypto_skcipher_decrypt(subreq); |
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skcipher_request_zero(subreq); |
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return ret; } static int mxs_dcp_aes_enqueue(struct ablkcipher_request *req, int enc, int ecb) { struct dcp *sdcp = global_sdcp; struct crypto_async_request *arq = &req->base; struct dcp_async_ctx *actx = crypto_tfm_ctx(arq->tfm); |
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struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req); |
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int ret; if (unlikely(actx->key_len != AES_KEYSIZE_128)) return mxs_dcp_block_fallback(req, enc); |
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rctx->enc = enc; rctx->ecb = ecb; |
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actx->chan = DCP_CHAN_CRYPTO; |
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spin_lock(&sdcp->lock[actx->chan]); |
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ret = crypto_enqueue_request(&sdcp->queue[actx->chan], &req->base); |
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spin_unlock(&sdcp->lock[actx->chan]); |
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wake_up_process(sdcp->thread[actx->chan]); |
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return ret; |
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} static int mxs_dcp_aes_ecb_decrypt(struct ablkcipher_request *req) { return mxs_dcp_aes_enqueue(req, 0, 1); } static int mxs_dcp_aes_ecb_encrypt(struct ablkcipher_request *req) { return mxs_dcp_aes_enqueue(req, 1, 1); } static int mxs_dcp_aes_cbc_decrypt(struct ablkcipher_request *req) { return mxs_dcp_aes_enqueue(req, 0, 0); } static int mxs_dcp_aes_cbc_encrypt(struct ablkcipher_request *req) { return mxs_dcp_aes_enqueue(req, 1, 0); } static int mxs_dcp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int len) { struct dcp_async_ctx *actx = crypto_ablkcipher_ctx(tfm); unsigned int ret; /* * AES 128 is supposed by the hardware, store key into temporary * buffer and exit. We must use the temporary buffer here, since * there can still be an operation in progress. */ actx->key_len = len; if (len == AES_KEYSIZE_128) { memcpy(actx->key, key, len); return 0; } |
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/* * If the requested AES key size is not supported by the hardware, * but is supported by in-kernel software implementation, we use * software fallback. */ |
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crypto_sync_skcipher_clear_flags(actx->fallback, CRYPTO_TFM_REQ_MASK); crypto_sync_skcipher_set_flags(actx->fallback, |
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tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); |
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ret = crypto_sync_skcipher_setkey(actx->fallback, key, len); |
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if (!ret) return 0; tfm->base.crt_flags &= ~CRYPTO_TFM_RES_MASK; |
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tfm->base.crt_flags |= crypto_sync_skcipher_get_flags(actx->fallback) & |
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CRYPTO_TFM_RES_MASK; |
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return ret; } static int mxs_dcp_aes_fallback_init(struct crypto_tfm *tfm) { |
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const char *name = crypto_tfm_alg_name(tfm); |
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struct dcp_async_ctx *actx = crypto_tfm_ctx(tfm); |
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struct crypto_sync_skcipher *blk; |
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blk = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); |
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if (IS_ERR(blk)) return PTR_ERR(blk); actx->fallback = blk; |
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tfm->crt_ablkcipher.reqsize = sizeof(struct dcp_aes_req_ctx); |
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return 0; } static void mxs_dcp_aes_fallback_exit(struct crypto_tfm *tfm) { struct dcp_async_ctx *actx = crypto_tfm_ctx(tfm); |
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crypto_free_sync_skcipher(actx->fallback); |
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} /* * Hashing (SHA1/SHA256) */ static int mxs_dcp_run_sha(struct ahash_request *req) { struct dcp *sdcp = global_sdcp; int ret; struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req); |
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struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan]; |
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dma_addr_t digest_phys = 0; |
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dma_addr_t buf_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_in_buf, DCP_BUF_SZ, DMA_TO_DEVICE); /* Fill in the DMA descriptor. */ desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE | MXS_DCP_CONTROL0_INTERRUPT | MXS_DCP_CONTROL0_ENABLE_HASH; if (rctx->init) desc->control0 |= MXS_DCP_CONTROL0_HASH_INIT; desc->control1 = actx->alg; desc->next_cmd_addr = 0; desc->source = buf_phys; desc->destination = 0; desc->size = actx->fill; desc->payload = 0; desc->status = 0; |
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/* * Align driver with hw behavior when generating null hashes */ if (rctx->init && rctx->fini && desc->size == 0) { struct hash_alg_common *halg = crypto_hash_alg_common(tfm); const uint8_t *sha_buf = (actx->alg == MXS_DCP_CONTROL1_HASH_SELECT_SHA1) ? sha1_null_hash : sha256_null_hash; memcpy(sdcp->coh->sha_out_buf, sha_buf, halg->digestsize); ret = 0; goto done_run; } |
15b59e7c3
|
578 579 |
/* Set HASH_TERM bit for last transfer block. */ if (rctx->fini) { |
c709eebaf
|
580 581 |
digest_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_out_buf, DCP_SHA_PAY_SZ, DMA_FROM_DEVICE); |
15b59e7c3
|
582 583 584 585 586 |
desc->control0 |= MXS_DCP_CONTROL0_HASH_TERM; desc->payload = digest_phys; } ret = mxs_dcp_start_dma(actx); |
04d088cc0
|
587 |
if (rctx->fini) |
c709eebaf
|
588 |
dma_unmap_single(sdcp->dev, digest_phys, DCP_SHA_PAY_SZ, |
04d088cc0
|
589 |
DMA_FROM_DEVICE); |
c709eebaf
|
590 |
done_run: |
15b59e7c3
|
591 592 593 594 595 596 597 598 599 600 601 602 603 604 |
dma_unmap_single(sdcp->dev, buf_phys, DCP_BUF_SZ, DMA_TO_DEVICE); return ret; } static int dcp_sha_req_to_buf(struct crypto_async_request *arq) { struct dcp *sdcp = global_sdcp; struct ahash_request *req = ahash_request_cast(arq); struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req); struct hash_alg_common *halg = crypto_hash_alg_common(tfm); |
15b59e7c3
|
605 |
|
15b59e7c3
|
606 |
uint8_t *in_buf = sdcp->coh->sha_in_buf; |
c709eebaf
|
607 |
uint8_t *out_buf = sdcp->coh->sha_out_buf; |
15b59e7c3
|
608 |
|
15b59e7c3
|
609 |
struct scatterlist *src; |
eacec15f5
|
610 |
unsigned int i, len, clen, oft = 0; |
15b59e7c3
|
611 612 613 614 615 |
int ret; int fin = rctx->fini; if (fin) rctx->fini = 0; |
eacec15f5
|
616 617 |
src = req->src; len = req->nbytes; |
15b59e7c3
|
618 |
|
eacec15f5
|
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 |
while (len) { if (actx->fill + len > DCP_BUF_SZ) clen = DCP_BUF_SZ - actx->fill; else clen = len; scatterwalk_map_and_copy(in_buf + actx->fill, src, oft, clen, 0); len -= clen; oft += clen; actx->fill += clen; /* * If we filled the buffer and still have some * more data, submit the buffer. */ if (len && actx->fill == DCP_BUF_SZ) { ret = mxs_dcp_run_sha(req); if (ret) return ret; actx->fill = 0; rctx->init = 0; } |
15b59e7c3
|
643 644 645 646 647 648 |
} if (fin) { rctx->fini = 1; /* Submit whatever is left. */ |
04d088cc0
|
649 650 |
if (!req->result) return -EINVAL; |
15b59e7c3
|
651 |
ret = mxs_dcp_run_sha(req); |
04d088cc0
|
652 |
if (ret) |
15b59e7c3
|
653 |
return ret; |
04d088cc0
|
654 |
|
15b59e7c3
|
655 |
actx->fill = 0; |
c709eebaf
|
656 657 658 |
/* For some reason the result is flipped */ for (i = 0; i < halg->digestsize; i++) req->result[i] = out_buf[halg->digestsize - i - 1]; |
15b59e7c3
|
659 660 661 662 663 664 665 666 667 668 669 670 |
} return 0; } static int dcp_chan_thread_sha(void *data) { struct dcp *sdcp = global_sdcp; const int chan = DCP_CHAN_HASH_SHA; struct crypto_async_request *backlog; struct crypto_async_request *arq; |
11fe71f14
|
671 |
int ret; |
15b59e7c3
|
672 |
|
d80771c08
|
673 674 |
while (!kthread_should_stop()) { set_current_state(TASK_INTERRUPTIBLE); |
15b59e7c3
|
675 |
|
d80771c08
|
676 |
spin_lock(&sdcp->lock[chan]); |
15b59e7c3
|
677 678 |
backlog = crypto_get_backlog(&sdcp->queue[chan]); arq = crypto_dequeue_request(&sdcp->queue[chan]); |
d80771c08
|
679 680 681 682 683 684 685 686 |
spin_unlock(&sdcp->lock[chan]); if (!backlog && !arq) { schedule(); continue; } set_current_state(TASK_RUNNING); |
15b59e7c3
|
687 688 689 690 691 |
if (backlog) backlog->complete(backlog, -EINPROGRESS); if (arq) { |
15b59e7c3
|
692 |
ret = dcp_sha_req_to_buf(arq); |
15b59e7c3
|
693 |
arq->complete(arq, ret); |
15b59e7c3
|
694 |
} |
d80771c08
|
695 |
} |
15b59e7c3
|
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 |
return 0; } static int dcp_sha_init(struct ahash_request *req) { struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); struct hash_alg_common *halg = crypto_hash_alg_common(tfm); /* * Start hashing session. The code below only inits the * hashing session context, nothing more. */ memset(actx, 0, sizeof(*actx)); if (strcmp(halg->base.cra_name, "sha1") == 0) actx->alg = MXS_DCP_CONTROL1_HASH_SELECT_SHA1; else actx->alg = MXS_DCP_CONTROL1_HASH_SELECT_SHA256; actx->fill = 0; actx->hot = 0; actx->chan = DCP_CHAN_HASH_SHA; mutex_init(&actx->mutex); return 0; } static int dcp_sha_update_fx(struct ahash_request *req, int fini) { struct dcp *sdcp = global_sdcp; struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req); struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); int ret; /* * Ignore requests that have no data in them and are not * the trailing requests in the stream of requests. */ if (!req->nbytes && !fini) return 0; mutex_lock(&actx->mutex); rctx->fini = fini; if (!actx->hot) { actx->hot = 1; rctx->init = 1; } |
d80771c08
|
752 |
spin_lock(&sdcp->lock[actx->chan]); |
15b59e7c3
|
753 |
ret = crypto_enqueue_request(&sdcp->queue[actx->chan], &req->base); |
d80771c08
|
754 |
spin_unlock(&sdcp->lock[actx->chan]); |
15b59e7c3
|
755 756 757 |
wake_up_process(sdcp->thread[actx->chan]); mutex_unlock(&actx->mutex); |
dbbaffefd
|
758 |
return ret; |
15b59e7c3
|
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 |
} static int dcp_sha_update(struct ahash_request *req) { return dcp_sha_update_fx(req, 0); } static int dcp_sha_final(struct ahash_request *req) { ahash_request_set_crypt(req, NULL, req->result, 0); req->nbytes = 0; return dcp_sha_update_fx(req, 1); } static int dcp_sha_finup(struct ahash_request *req) { return dcp_sha_update_fx(req, 1); } static int dcp_sha_digest(struct ahash_request *req) { int ret; ret = dcp_sha_init(req); if (ret) return ret; return dcp_sha_finup(req); } |
ea9e7568f
|
788 |
static int dcp_sha_import(struct ahash_request *req, const void *in) |
9190b6fd5
|
789 |
{ |
ea9e7568f
|
790 791 792 793 794 795 796 797 798 799 800 |
struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req); struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); const struct dcp_export_state *export = in; memset(rctx, 0, sizeof(struct dcp_sha_req_ctx)); memset(actx, 0, sizeof(struct dcp_async_ctx)); memcpy(rctx, &export->req_ctx, sizeof(struct dcp_sha_req_ctx)); memcpy(actx, &export->async_ctx, sizeof(struct dcp_async_ctx)); return 0; |
9190b6fd5
|
801 |
} |
ea9e7568f
|
802 |
static int dcp_sha_export(struct ahash_request *req, void *out) |
9190b6fd5
|
803 |
{ |
ea9e7568f
|
804 805 806 807 808 809 810 811 812 |
struct dcp_sha_req_ctx *rctx_state = ahash_request_ctx(req); struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx_state = crypto_ahash_ctx(tfm); struct dcp_export_state *export = out; memcpy(&export->req_ctx, rctx_state, sizeof(struct dcp_sha_req_ctx)); memcpy(&export->async_ctx, actx_state, sizeof(struct dcp_async_ctx)); return 0; |
9190b6fd5
|
813 |
} |
15b59e7c3
|
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 |
static int dcp_sha_cra_init(struct crypto_tfm *tfm) { crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), sizeof(struct dcp_sha_req_ctx)); return 0; } static void dcp_sha_cra_exit(struct crypto_tfm *tfm) { } /* AES 128 ECB and AES 128 CBC */ static struct crypto_alg dcp_aes_algs[] = { { .cra_name = "ecb(aes)", .cra_driver_name = "ecb-aes-dcp", .cra_priority = 400, .cra_alignmask = 15, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK, .cra_init = mxs_dcp_aes_fallback_init, .cra_exit = mxs_dcp_aes_fallback_exit, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct dcp_async_ctx), .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = mxs_dcp_aes_setkey, .encrypt = mxs_dcp_aes_ecb_encrypt, .decrypt = mxs_dcp_aes_ecb_decrypt }, }, }, { .cra_name = "cbc(aes)", .cra_driver_name = "cbc-aes-dcp", .cra_priority = 400, .cra_alignmask = 15, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK, .cra_init = mxs_dcp_aes_fallback_init, .cra_exit = mxs_dcp_aes_fallback_exit, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct dcp_async_ctx), .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = mxs_dcp_aes_setkey, .encrypt = mxs_dcp_aes_cbc_encrypt, .decrypt = mxs_dcp_aes_cbc_decrypt, .ivsize = AES_BLOCK_SIZE, }, }, }, }; /* SHA1 */ static struct ahash_alg dcp_sha1_alg = { .init = dcp_sha_init, .update = dcp_sha_update, .final = dcp_sha_final, .finup = dcp_sha_finup, .digest = dcp_sha_digest, |
ea9e7568f
|
884 885 |
.import = dcp_sha_import, .export = dcp_sha_export, |
15b59e7c3
|
886 887 |
.halg = { .digestsize = SHA1_DIGEST_SIZE, |
ea9e7568f
|
888 |
.statesize = sizeof(struct dcp_export_state), |
15b59e7c3
|
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 |
.base = { .cra_name = "sha1", .cra_driver_name = "sha1-dcp", .cra_priority = 400, .cra_alignmask = 63, .cra_flags = CRYPTO_ALG_ASYNC, .cra_blocksize = SHA1_BLOCK_SIZE, .cra_ctxsize = sizeof(struct dcp_async_ctx), .cra_module = THIS_MODULE, .cra_init = dcp_sha_cra_init, .cra_exit = dcp_sha_cra_exit, }, }, }; /* SHA256 */ static struct ahash_alg dcp_sha256_alg = { .init = dcp_sha_init, .update = dcp_sha_update, .final = dcp_sha_final, .finup = dcp_sha_finup, .digest = dcp_sha_digest, |
ea9e7568f
|
911 912 |
.import = dcp_sha_import, .export = dcp_sha_export, |
15b59e7c3
|
913 914 |
.halg = { .digestsize = SHA256_DIGEST_SIZE, |
ea9e7568f
|
915 |
.statesize = sizeof(struct dcp_export_state), |
15b59e7c3
|
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 |
.base = { .cra_name = "sha256", .cra_driver_name = "sha256-dcp", .cra_priority = 400, .cra_alignmask = 63, .cra_flags = CRYPTO_ALG_ASYNC, .cra_blocksize = SHA256_BLOCK_SIZE, .cra_ctxsize = sizeof(struct dcp_async_ctx), .cra_module = THIS_MODULE, .cra_init = dcp_sha_cra_init, .cra_exit = dcp_sha_cra_exit, }, }, }; static irqreturn_t mxs_dcp_irq(int irq, void *context) { struct dcp *sdcp = context; uint32_t stat; int i; stat = readl(sdcp->base + MXS_DCP_STAT); stat &= MXS_DCP_STAT_IRQ_MASK; if (!stat) return IRQ_NONE; /* Clear the interrupts. */ writel(stat, sdcp->base + MXS_DCP_STAT_CLR); /* Complete the DMA requests that finished. */ for (i = 0; i < DCP_MAX_CHANS; i++) if (stat & (1 << i)) complete(&sdcp->completion[i]); return IRQ_HANDLED; } static int mxs_dcp_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct dcp *sdcp = NULL; int i, ret; |
15b59e7c3
|
958 |
int dcp_vmi_irq, dcp_irq; |
15b59e7c3
|
959 960 961 |
if (global_sdcp) { dev_err(dev, "Only one DCP instance allowed! "); |
5fc8005ba
|
962 |
return -ENODEV; |
15b59e7c3
|
963 |
} |
15b59e7c3
|
964 |
dcp_vmi_irq = platform_get_irq(pdev, 0); |
514838e92
|
965 |
if (dcp_vmi_irq < 0) |
5fc8005ba
|
966 |
return dcp_vmi_irq; |
d9588f874
|
967 |
|
15b59e7c3
|
968 |
dcp_irq = platform_get_irq(pdev, 1); |
514838e92
|
969 |
if (dcp_irq < 0) |
5fc8005ba
|
970 |
return dcp_irq; |
15b59e7c3
|
971 972 |
sdcp = devm_kzalloc(dev, sizeof(*sdcp), GFP_KERNEL); |
5fc8005ba
|
973 974 |
if (!sdcp) return -ENOMEM; |
15b59e7c3
|
975 976 |
sdcp->dev = dev; |
cec1caaf3
|
977 |
sdcp->base = devm_platform_ioremap_resource(pdev, 0); |
5fc8005ba
|
978 979 |
if (IS_ERR(sdcp->base)) return PTR_ERR(sdcp->base); |
15b59e7c3
|
980 981 982 983 984 985 |
ret = devm_request_irq(dev, dcp_vmi_irq, mxs_dcp_irq, 0, "dcp-vmi-irq", sdcp); if (ret) { dev_err(dev, "Failed to claim DCP VMI IRQ! "); |
5fc8005ba
|
986 |
return ret; |
15b59e7c3
|
987 988 989 990 991 992 993 |
} ret = devm_request_irq(dev, dcp_irq, mxs_dcp_irq, 0, "dcp-irq", sdcp); if (ret) { dev_err(dev, "Failed to claim DCP IRQ! "); |
5fc8005ba
|
994 |
return ret; |
15b59e7c3
|
995 996 997 |
} /* Allocate coherent helper block. */ |
1a7c68561
|
998 999 |
sdcp->coh = devm_kzalloc(dev, sizeof(*sdcp->coh) + DCP_ALIGNMENT, GFP_KERNEL); |
5fc8005ba
|
1000 1001 |
if (!sdcp->coh) return -ENOMEM; |
15b59e7c3
|
1002 |
|
1a7c68561
|
1003 1004 |
/* Re-align the structure so it fits the DCP constraints. */ sdcp->coh = PTR_ALIGN(sdcp->coh, DCP_ALIGNMENT); |
57f002891
|
1005 1006 1007 1008 1009 1010 1011 1012 |
/* DCP clock is optional, only used on some SOCs */ sdcp->dcp_clk = devm_clk_get(dev, "dcp"); if (IS_ERR(sdcp->dcp_clk)) { if (sdcp->dcp_clk != ERR_PTR(-ENOENT)) return PTR_ERR(sdcp->dcp_clk); sdcp->dcp_clk = NULL; } ret = clk_prepare_enable(sdcp->dcp_clk); |
fecfd7f7e
|
1013 |
if (ret) |
5fc8005ba
|
1014 |
return ret; |
15b59e7c3
|
1015 |
|
57f002891
|
1016 1017 1018 1019 1020 1021 1022 |
/* Restart the DCP block. */ ret = stmp_reset_block(sdcp->base); if (ret) { dev_err(dev, "Failed reset "); goto err_disable_unprepare_clk; } |
15b59e7c3
|
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 |
/* Initialize control register. */ writel(MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES | MXS_DCP_CTRL_ENABLE_CONTEXT_CACHING | 0xf, sdcp->base + MXS_DCP_CTRL); /* Enable all DCP DMA channels. */ writel(MXS_DCP_CHANNELCTRL_ENABLE_CHANNEL_MASK, sdcp->base + MXS_DCP_CHANNELCTRL); /* * We do not enable context switching. Give the context buffer a * pointer to an illegal address so if context switching is * inadvertantly enabled, the DCP will return an error instead of * trashing good memory. The DCP DMA cannot access ROM, so any ROM * address will do. */ writel(0xffff0000, sdcp->base + MXS_DCP_CONTEXT); for (i = 0; i < DCP_MAX_CHANS; i++) writel(0xffffffff, sdcp->base + MXS_DCP_CH_N_STAT_CLR(i)); writel(0xffffffff, sdcp->base + MXS_DCP_STAT_CLR); global_sdcp = sdcp; platform_set_drvdata(pdev, sdcp); for (i = 0; i < DCP_MAX_CHANS; i++) { |
d80771c08
|
1049 |
spin_lock_init(&sdcp->lock[i]); |
15b59e7c3
|
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
init_completion(&sdcp->completion[i]); crypto_init_queue(&sdcp->queue[i], 50); } /* Create the SHA and AES handler threads. */ sdcp->thread[DCP_CHAN_HASH_SHA] = kthread_run(dcp_chan_thread_sha, NULL, "mxs_dcp_chan/sha"); if (IS_ERR(sdcp->thread[DCP_CHAN_HASH_SHA])) { dev_err(dev, "Error starting SHA thread! "); |
57f002891
|
1060 1061 |
ret = PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]); goto err_disable_unprepare_clk; |
15b59e7c3
|
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 |
} sdcp->thread[DCP_CHAN_CRYPTO] = kthread_run(dcp_chan_thread_aes, NULL, "mxs_dcp_chan/aes"); if (IS_ERR(sdcp->thread[DCP_CHAN_CRYPTO])) { dev_err(dev, "Error starting SHA thread! "); ret = PTR_ERR(sdcp->thread[DCP_CHAN_CRYPTO]); goto err_destroy_sha_thread; } /* Register the various crypto algorithms. */ sdcp->caps = readl(sdcp->base + MXS_DCP_CAPABILITY1); if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128) { ret = crypto_register_algs(dcp_aes_algs, ARRAY_SIZE(dcp_aes_algs)); if (ret) { /* Failed to register algorithm. */ dev_err(dev, "Failed to register AES crypto! "); goto err_destroy_aes_thread; } } if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1) { ret = crypto_register_ahash(&dcp_sha1_alg); if (ret) { dev_err(dev, "Failed to register %s hash! ", dcp_sha1_alg.halg.base.cra_name); goto err_unregister_aes; } } if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA256) { ret = crypto_register_ahash(&dcp_sha256_alg); if (ret) { dev_err(dev, "Failed to register %s hash! ", dcp_sha256_alg.halg.base.cra_name); goto err_unregister_sha1; } } return 0; err_unregister_sha1: if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1) crypto_unregister_ahash(&dcp_sha1_alg); err_unregister_aes: if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128) crypto_unregister_algs(dcp_aes_algs, ARRAY_SIZE(dcp_aes_algs)); err_destroy_aes_thread: kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]); err_destroy_sha_thread: kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]); |
57f002891
|
1122 1123 1124 |
err_disable_unprepare_clk: clk_disable_unprepare(sdcp->dcp_clk); |
15b59e7c3
|
1125 1126 1127 1128 1129 1130 |
return ret; } static int mxs_dcp_remove(struct platform_device *pdev) { struct dcp *sdcp = platform_get_drvdata(pdev); |
15b59e7c3
|
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA256) crypto_unregister_ahash(&dcp_sha256_alg); if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1) crypto_unregister_ahash(&dcp_sha1_alg); if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128) crypto_unregister_algs(dcp_aes_algs, ARRAY_SIZE(dcp_aes_algs)); kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]); kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]); |
57f002891
|
1142 |
clk_disable_unprepare(sdcp->dcp_clk); |
15b59e7c3
|
1143 |
platform_set_drvdata(pdev, NULL); |
15b59e7c3
|
1144 |
global_sdcp = NULL; |
15b59e7c3
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1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 |
return 0; } static const struct of_device_id mxs_dcp_dt_ids[] = { { .compatible = "fsl,imx23-dcp", .data = NULL, }, { .compatible = "fsl,imx28-dcp", .data = NULL, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mxs_dcp_dt_ids); static struct platform_driver mxs_dcp_driver = { .probe = mxs_dcp_probe, .remove = mxs_dcp_remove, .driver = { .name = "mxs-dcp", |
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.of_match_table = mxs_dcp_dt_ids, }, }; module_platform_driver(mxs_dcp_driver); MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); MODULE_DESCRIPTION("Freescale MXS DCP Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mxs-dcp"); |