| /* |
| * Cryptographic API. |
| * |
| * Support for ATMEL SHA1/SHA256 HW acceleration. |
| * |
| * Copyright (c) 2012 Eukréa Electromatique - ATMEL |
| * Author: Nicolas Royer <nicolas@eukrea.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| * Some ideas are from omap-sham.c drivers. |
| */ |
| |
| |
| #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/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 <linux/cryptohash.h> |
| #include <crypto/scatterwalk.h> |
| #include <crypto/algapi.h> |
| #include <crypto/sha.h> |
| #include <crypto/hash.h> |
| #include <crypto/internal/hash.h> |
| #include <linux/platform_data/crypto-atmel.h> |
| #include "atmel-sha-regs.h" |
| |
| /* SHA flags */ |
| #define SHA_FLAGS_BUSY BIT(0) |
| #define SHA_FLAGS_FINAL BIT(1) |
| #define SHA_FLAGS_DMA_ACTIVE BIT(2) |
| #define SHA_FLAGS_OUTPUT_READY BIT(3) |
| #define SHA_FLAGS_INIT BIT(4) |
| #define SHA_FLAGS_CPU BIT(5) |
| #define SHA_FLAGS_DMA_READY BIT(6) |
| |
| #define SHA_FLAGS_FINUP BIT(16) |
| #define SHA_FLAGS_SG BIT(17) |
| #define SHA_FLAGS_SHA1 BIT(18) |
| #define SHA_FLAGS_SHA224 BIT(19) |
| #define SHA_FLAGS_SHA256 BIT(20) |
| #define SHA_FLAGS_SHA384 BIT(21) |
| #define SHA_FLAGS_SHA512 BIT(22) |
| #define SHA_FLAGS_ERROR BIT(23) |
| #define SHA_FLAGS_PAD BIT(24) |
| |
| #define SHA_OP_UPDATE 1 |
| #define SHA_OP_FINAL 2 |
| |
| #define SHA_BUFFER_LEN PAGE_SIZE |
| |
| #define ATMEL_SHA_DMA_THRESHOLD 56 |
| |
| struct atmel_sha_caps { |
| bool has_dma; |
| bool has_dualbuff; |
| bool has_sha224; |
| bool has_sha_384_512; |
| }; |
| |
| struct atmel_sha_dev; |
| |
| struct atmel_sha_reqctx { |
| struct atmel_sha_dev *dd; |
| unsigned long flags; |
| unsigned long op; |
| |
| u8 digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32)); |
| u64 digcnt[2]; |
| size_t bufcnt; |
| size_t buflen; |
| dma_addr_t dma_addr; |
| |
| /* walk state */ |
| struct scatterlist *sg; |
| unsigned int offset; /* offset in current sg */ |
| unsigned int total; /* total request */ |
| |
| size_t block_size; |
| |
| u8 buffer[0] __aligned(sizeof(u32)); |
| }; |
| |
| struct atmel_sha_ctx { |
| struct atmel_sha_dev *dd; |
| |
| unsigned long flags; |
| }; |
| |
| #define ATMEL_SHA_QUEUE_LENGTH 50 |
| |
| struct atmel_sha_dma { |
| struct dma_chan *chan; |
| struct dma_slave_config dma_conf; |
| }; |
| |
| struct atmel_sha_dev { |
| struct list_head list; |
| unsigned long phys_base; |
| struct device *dev; |
| struct clk *iclk; |
| int irq; |
| void __iomem *io_base; |
| |
| spinlock_t lock; |
| int err; |
| struct tasklet_struct done_task; |
| |
| unsigned long flags; |
| struct crypto_queue queue; |
| struct ahash_request *req; |
| |
| struct atmel_sha_dma dma_lch_in; |
| |
| struct atmel_sha_caps caps; |
| |
| u32 hw_version; |
| }; |
| |
| struct atmel_sha_drv { |
| struct list_head dev_list; |
| spinlock_t lock; |
| }; |
| |
| static struct atmel_sha_drv atmel_sha = { |
| .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list), |
| .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock), |
| }; |
| |
| static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset) |
| { |
| return readl_relaxed(dd->io_base + offset); |
| } |
| |
| static inline void atmel_sha_write(struct atmel_sha_dev *dd, |
| u32 offset, u32 value) |
| { |
| writel_relaxed(value, dd->io_base + offset); |
| } |
| |
| static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx) |
| { |
| size_t count; |
| |
| while ((ctx->bufcnt < ctx->buflen) && ctx->total) { |
| count = min(ctx->sg->length - ctx->offset, ctx->total); |
| count = min(count, ctx->buflen - ctx->bufcnt); |
| |
| if (count <= 0) { |
| /* |
| * Check if count <= 0 because the buffer is full or |
| * because the sg length is 0. In the latest case, |
| * check if there is another sg in the list, a 0 length |
| * sg doesn't necessarily mean the end of the sg list. |
| */ |
| if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) { |
| ctx->sg = sg_next(ctx->sg); |
| continue; |
| } else { |
| break; |
| } |
| } |
| |
| scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg, |
| ctx->offset, count, 0); |
| |
| ctx->bufcnt += count; |
| ctx->offset += count; |
| ctx->total -= count; |
| |
| if (ctx->offset == ctx->sg->length) { |
| ctx->sg = sg_next(ctx->sg); |
| if (ctx->sg) |
| ctx->offset = 0; |
| else |
| ctx->total = 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * The purpose of this padding is to ensure that the padded message is a |
| * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512). |
| * The bit "1" is appended at the end of the message followed by |
| * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or |
| * 128 bits block (SHA384/SHA512) equals to the message length in bits |
| * is appended. |
| * |
| * For SHA1/SHA224/SHA256, padlen is calculated as followed: |
| * - if message length < 56 bytes then padlen = 56 - message length |
| * - else padlen = 64 + 56 - message length |
| * |
| * For SHA384/SHA512, padlen is calculated as followed: |
| * - if message length < 112 bytes then padlen = 112 - message length |
| * - else padlen = 128 + 112 - message length |
| */ |
| static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length) |
| { |
| unsigned int index, padlen; |
| u64 bits[2]; |
| u64 size[2]; |
| |
| size[0] = ctx->digcnt[0]; |
| size[1] = ctx->digcnt[1]; |
| |
| size[0] += ctx->bufcnt; |
| if (size[0] < ctx->bufcnt) |
| size[1]++; |
| |
| size[0] += length; |
| if (size[0] < length) |
| size[1]++; |
| |
| bits[1] = cpu_to_be64(size[0] << 3); |
| bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61); |
| |
| if (ctx->flags & (SHA_FLAGS_SHA384 | SHA_FLAGS_SHA512)) { |
| index = ctx->bufcnt & 0x7f; |
| padlen = (index < 112) ? (112 - index) : ((128+112) - index); |
| *(ctx->buffer + ctx->bufcnt) = 0x80; |
| memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1); |
| memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16); |
| ctx->bufcnt += padlen + 16; |
| ctx->flags |= SHA_FLAGS_PAD; |
| } else { |
| index = ctx->bufcnt & 0x3f; |
| padlen = (index < 56) ? (56 - index) : ((64+56) - index); |
| *(ctx->buffer + ctx->bufcnt) = 0x80; |
| memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1); |
| memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8); |
| ctx->bufcnt += padlen + 8; |
| ctx->flags |= SHA_FLAGS_PAD; |
| } |
| } |
| |
| static int atmel_sha_init(struct ahash_request *req) |
| { |
| struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
| struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm); |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| struct atmel_sha_dev *dd = NULL; |
| struct atmel_sha_dev *tmp; |
| |
| spin_lock_bh(&atmel_sha.lock); |
| if (!tctx->dd) { |
| list_for_each_entry(tmp, &atmel_sha.dev_list, list) { |
| dd = tmp; |
| break; |
| } |
| tctx->dd = dd; |
| } else { |
| dd = tctx->dd; |
| } |
| |
| spin_unlock_bh(&atmel_sha.lock); |
| |
| ctx->dd = dd; |
| |
| ctx->flags = 0; |
| |
| dev_dbg(dd->dev, "init: digest size: %d\n", |
| crypto_ahash_digestsize(tfm)); |
| |
| switch (crypto_ahash_digestsize(tfm)) { |
| case SHA1_DIGEST_SIZE: |
| ctx->flags |= SHA_FLAGS_SHA1; |
| ctx->block_size = SHA1_BLOCK_SIZE; |
| break; |
| case SHA224_DIGEST_SIZE: |
| ctx->flags |= SHA_FLAGS_SHA224; |
| ctx->block_size = SHA224_BLOCK_SIZE; |
| break; |
| case SHA256_DIGEST_SIZE: |
| ctx->flags |= SHA_FLAGS_SHA256; |
| ctx->block_size = SHA256_BLOCK_SIZE; |
| break; |
| case SHA384_DIGEST_SIZE: |
| ctx->flags |= SHA_FLAGS_SHA384; |
| ctx->block_size = SHA384_BLOCK_SIZE; |
| break; |
| case SHA512_DIGEST_SIZE: |
| ctx->flags |= SHA_FLAGS_SHA512; |
| ctx->block_size = SHA512_BLOCK_SIZE; |
| break; |
| default: |
| return -EINVAL; |
| break; |
| } |
| |
| ctx->bufcnt = 0; |
| ctx->digcnt[0] = 0; |
| ctx->digcnt[1] = 0; |
| ctx->buflen = SHA_BUFFER_LEN; |
| |
| return 0; |
| } |
| |
| static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| u32 valcr = 0, valmr = SHA_MR_MODE_AUTO; |
| |
| if (likely(dma)) { |
| if (!dd->caps.has_dma) |
| atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE); |
| valmr = SHA_MR_MODE_PDC; |
| if (dd->caps.has_dualbuff) |
| valmr |= SHA_MR_DUALBUFF; |
| } else { |
| atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY); |
| } |
| |
| if (ctx->flags & SHA_FLAGS_SHA1) |
| valmr |= SHA_MR_ALGO_SHA1; |
| else if (ctx->flags & SHA_FLAGS_SHA224) |
| valmr |= SHA_MR_ALGO_SHA224; |
| else if (ctx->flags & SHA_FLAGS_SHA256) |
| valmr |= SHA_MR_ALGO_SHA256; |
| else if (ctx->flags & SHA_FLAGS_SHA384) |
| valmr |= SHA_MR_ALGO_SHA384; |
| else if (ctx->flags & SHA_FLAGS_SHA512) |
| valmr |= SHA_MR_ALGO_SHA512; |
| |
| /* Setting CR_FIRST only for the first iteration */ |
| if (!(ctx->digcnt[0] || ctx->digcnt[1])) |
| valcr = SHA_CR_FIRST; |
| |
| atmel_sha_write(dd, SHA_CR, valcr); |
| atmel_sha_write(dd, SHA_MR, valmr); |
| } |
| |
| static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf, |
| size_t length, int final) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| int count, len32; |
| const u32 *buffer = (const u32 *)buf; |
| |
| dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n", |
| ctx->digcnt[1], ctx->digcnt[0], length, final); |
| |
| atmel_sha_write_ctrl(dd, 0); |
| |
| /* should be non-zero before next lines to disable clocks later */ |
| ctx->digcnt[0] += length; |
| if (ctx->digcnt[0] < length) |
| ctx->digcnt[1]++; |
| |
| if (final) |
| dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */ |
| |
| len32 = DIV_ROUND_UP(length, sizeof(u32)); |
| |
| dd->flags |= SHA_FLAGS_CPU; |
| |
| for (count = 0; count < len32; count++) |
| atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]); |
| |
| return -EINPROGRESS; |
| } |
| |
| static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1, |
| size_t length1, dma_addr_t dma_addr2, size_t length2, int final) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| int len32; |
| |
| dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n", |
| ctx->digcnt[1], ctx->digcnt[0], length1, final); |
| |
| len32 = DIV_ROUND_UP(length1, sizeof(u32)); |
| atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS); |
| atmel_sha_write(dd, SHA_TPR, dma_addr1); |
| atmel_sha_write(dd, SHA_TCR, len32); |
| |
| len32 = DIV_ROUND_UP(length2, sizeof(u32)); |
| atmel_sha_write(dd, SHA_TNPR, dma_addr2); |
| atmel_sha_write(dd, SHA_TNCR, len32); |
| |
| atmel_sha_write_ctrl(dd, 1); |
| |
| /* should be non-zero before next lines to disable clocks later */ |
| ctx->digcnt[0] += length1; |
| if (ctx->digcnt[0] < length1) |
| ctx->digcnt[1]++; |
| |
| if (final) |
| dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */ |
| |
| dd->flags |= SHA_FLAGS_DMA_ACTIVE; |
| |
| /* Start DMA transfer */ |
| atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN); |
| |
| return -EINPROGRESS; |
| } |
| |
| static void atmel_sha_dma_callback(void *data) |
| { |
| struct atmel_sha_dev *dd = data; |
| |
| /* dma_lch_in - completed - wait DATRDY */ |
| atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY); |
| } |
| |
| static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1, |
| size_t length1, dma_addr_t dma_addr2, size_t length2, int final) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| struct dma_async_tx_descriptor *in_desc; |
| struct scatterlist sg[2]; |
| |
| dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n", |
| ctx->digcnt[1], ctx->digcnt[0], length1, final); |
| |
| dd->dma_lch_in.dma_conf.src_maxburst = 16; |
| dd->dma_lch_in.dma_conf.dst_maxburst = 16; |
| |
| dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf); |
| |
| if (length2) { |
| sg_init_table(sg, 2); |
| sg_dma_address(&sg[0]) = dma_addr1; |
| sg_dma_len(&sg[0]) = length1; |
| sg_dma_address(&sg[1]) = dma_addr2; |
| sg_dma_len(&sg[1]) = length2; |
| in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2, |
| DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| } else { |
| sg_init_table(sg, 1); |
| sg_dma_address(&sg[0]) = dma_addr1; |
| sg_dma_len(&sg[0]) = length1; |
| in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1, |
| DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| } |
| if (!in_desc) |
| return -EINVAL; |
| |
| in_desc->callback = atmel_sha_dma_callback; |
| in_desc->callback_param = dd; |
| |
| atmel_sha_write_ctrl(dd, 1); |
| |
| /* should be non-zero before next lines to disable clocks later */ |
| ctx->digcnt[0] += length1; |
| if (ctx->digcnt[0] < length1) |
| ctx->digcnt[1]++; |
| |
| if (final) |
| dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */ |
| |
| dd->flags |= SHA_FLAGS_DMA_ACTIVE; |
| |
| /* Start DMA transfer */ |
| dmaengine_submit(in_desc); |
| dma_async_issue_pending(dd->dma_lch_in.chan); |
| |
| return -EINPROGRESS; |
| } |
| |
| static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1, |
| size_t length1, dma_addr_t dma_addr2, size_t length2, int final) |
| { |
| if (dd->caps.has_dma) |
| return atmel_sha_xmit_dma(dd, dma_addr1, length1, |
| dma_addr2, length2, final); |
| else |
| return atmel_sha_xmit_pdc(dd, dma_addr1, length1, |
| dma_addr2, length2, final); |
| } |
| |
| static int atmel_sha_update_cpu(struct atmel_sha_dev *dd) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| int bufcnt; |
| |
| atmel_sha_append_sg(ctx); |
| atmel_sha_fill_padding(ctx, 0); |
| bufcnt = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| |
| return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1); |
| } |
| |
| static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd, |
| struct atmel_sha_reqctx *ctx, |
| size_t length, int final) |
| { |
| ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, |
| ctx->buflen + ctx->block_size, DMA_TO_DEVICE); |
| if (dma_mapping_error(dd->dev, ctx->dma_addr)) { |
| dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen + |
| ctx->block_size); |
| return -EINVAL; |
| } |
| |
| ctx->flags &= ~SHA_FLAGS_SG; |
| |
| /* next call does not fail... so no unmap in the case of error */ |
| return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final); |
| } |
| |
| static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| unsigned int final; |
| size_t count; |
| |
| atmel_sha_append_sg(ctx); |
| |
| final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total; |
| |
| dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: 0x%llx 0x%llx, final: %d\n", |
| ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final); |
| |
| if (final) |
| atmel_sha_fill_padding(ctx, 0); |
| |
| if (final || (ctx->bufcnt == ctx->buflen)) { |
| count = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| return atmel_sha_xmit_dma_map(dd, ctx, count, final); |
| } |
| |
| return 0; |
| } |
| |
| static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| unsigned int length, final, tail; |
| struct scatterlist *sg; |
| unsigned int count; |
| |
| if (!ctx->total) |
| return 0; |
| |
| if (ctx->bufcnt || ctx->offset) |
| return atmel_sha_update_dma_slow(dd); |
| |
| dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %u, total: %u\n", |
| ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total); |
| |
| sg = ctx->sg; |
| |
| if (!IS_ALIGNED(sg->offset, sizeof(u32))) |
| return atmel_sha_update_dma_slow(dd); |
| |
| if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size)) |
| /* size is not ctx->block_size aligned */ |
| return atmel_sha_update_dma_slow(dd); |
| |
| length = min(ctx->total, sg->length); |
| |
| if (sg_is_last(sg)) { |
| if (!(ctx->flags & SHA_FLAGS_FINUP)) { |
| /* not last sg must be ctx->block_size aligned */ |
| tail = length & (ctx->block_size - 1); |
| length -= tail; |
| } |
| } |
| |
| ctx->total -= length; |
| ctx->offset = length; /* offset where to start slow */ |
| |
| final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total; |
| |
| /* Add padding */ |
| if (final) { |
| tail = length & (ctx->block_size - 1); |
| length -= tail; |
| ctx->total += tail; |
| ctx->offset = length; /* offset where to start slow */ |
| |
| sg = ctx->sg; |
| atmel_sha_append_sg(ctx); |
| |
| atmel_sha_fill_padding(ctx, length); |
| |
| ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, |
| ctx->buflen + ctx->block_size, DMA_TO_DEVICE); |
| if (dma_mapping_error(dd->dev, ctx->dma_addr)) { |
| dev_err(dd->dev, "dma %u bytes error\n", |
| ctx->buflen + ctx->block_size); |
| return -EINVAL; |
| } |
| |
| if (length == 0) { |
| ctx->flags &= ~SHA_FLAGS_SG; |
| count = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0, |
| 0, final); |
| } else { |
| ctx->sg = sg; |
| if (!dma_map_sg(dd->dev, ctx->sg, 1, |
| DMA_TO_DEVICE)) { |
| dev_err(dd->dev, "dma_map_sg error\n"); |
| return -EINVAL; |
| } |
| |
| ctx->flags |= SHA_FLAGS_SG; |
| |
| count = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), |
| length, ctx->dma_addr, count, final); |
| } |
| } |
| |
| if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) { |
| dev_err(dd->dev, "dma_map_sg error\n"); |
| return -EINVAL; |
| } |
| |
| ctx->flags |= SHA_FLAGS_SG; |
| |
| /* next call does not fail... so no unmap in the case of error */ |
| return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0, |
| 0, final); |
| } |
| |
| static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req); |
| |
| if (ctx->flags & SHA_FLAGS_SG) { |
| dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE); |
| if (ctx->sg->length == ctx->offset) { |
| ctx->sg = sg_next(ctx->sg); |
| if (ctx->sg) |
| ctx->offset = 0; |
| } |
| if (ctx->flags & SHA_FLAGS_PAD) { |
| dma_unmap_single(dd->dev, ctx->dma_addr, |
| ctx->buflen + ctx->block_size, DMA_TO_DEVICE); |
| } |
| } else { |
| dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen + |
| ctx->block_size, DMA_TO_DEVICE); |
| } |
| |
| return 0; |
| } |
| |
| static int atmel_sha_update_req(struct atmel_sha_dev *dd) |
| { |
| struct ahash_request *req = dd->req; |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| int err; |
| |
| dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n", |
| ctx->total, ctx->digcnt[1], ctx->digcnt[0]); |
| |
| if (ctx->flags & SHA_FLAGS_CPU) |
| err = atmel_sha_update_cpu(dd); |
| else |
| err = atmel_sha_update_dma_start(dd); |
| |
| /* wait for dma completion before can take more data */ |
| dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n", |
| err, ctx->digcnt[1], ctx->digcnt[0]); |
| |
| return err; |
| } |
| |
| static int atmel_sha_final_req(struct atmel_sha_dev *dd) |
| { |
| struct ahash_request *req = dd->req; |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| int err = 0; |
| int count; |
| |
| if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) { |
| atmel_sha_fill_padding(ctx, 0); |
| count = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| err = atmel_sha_xmit_dma_map(dd, ctx, count, 1); |
| } |
| /* faster to handle last block with cpu */ |
| else { |
| atmel_sha_fill_padding(ctx, 0); |
| count = ctx->bufcnt; |
| ctx->bufcnt = 0; |
| err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1); |
| } |
| |
| dev_dbg(dd->dev, "final_req: err: %d\n", err); |
| |
| return err; |
| } |
| |
| static void atmel_sha_copy_hash(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| u32 *hash = (u32 *)ctx->digest; |
| int i; |
| |
| if (ctx->flags & SHA_FLAGS_SHA1) |
| for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++) |
| hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i)); |
| else if (ctx->flags & SHA_FLAGS_SHA224) |
| for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(u32); i++) |
| hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i)); |
| else if (ctx->flags & SHA_FLAGS_SHA256) |
| for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(u32); i++) |
| hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i)); |
| else if (ctx->flags & SHA_FLAGS_SHA384) |
| for (i = 0; i < SHA384_DIGEST_SIZE / sizeof(u32); i++) |
| hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i)); |
| else |
| for (i = 0; i < SHA512_DIGEST_SIZE / sizeof(u32); i++) |
| hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i)); |
| } |
| |
| static void atmel_sha_copy_ready_hash(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| |
| if (!req->result) |
| return; |
| |
| if (ctx->flags & SHA_FLAGS_SHA1) |
| memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE); |
| else if (ctx->flags & SHA_FLAGS_SHA224) |
| memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE); |
| else if (ctx->flags & SHA_FLAGS_SHA256) |
| memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE); |
| else if (ctx->flags & SHA_FLAGS_SHA384) |
| memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE); |
| else |
| memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE); |
| } |
| |
| static int atmel_sha_finish(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| struct atmel_sha_dev *dd = ctx->dd; |
| int err = 0; |
| |
| if (ctx->digcnt[0] || ctx->digcnt[1]) |
| atmel_sha_copy_ready_hash(req); |
| |
| dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %d\n", ctx->digcnt[1], |
| ctx->digcnt[0], ctx->bufcnt); |
| |
| return err; |
| } |
| |
| static void atmel_sha_finish_req(struct ahash_request *req, int err) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| struct atmel_sha_dev *dd = ctx->dd; |
| |
| if (!err) { |
| atmel_sha_copy_hash(req); |
| if (SHA_FLAGS_FINAL & dd->flags) |
| err = atmel_sha_finish(req); |
| } else { |
| ctx->flags |= SHA_FLAGS_ERROR; |
| } |
| |
| /* atomic operation is not needed here */ |
| dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU | |
| SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY); |
| |
| clk_disable(dd->iclk); |
| |
| if (req->base.complete) |
| req->base.complete(&req->base, err); |
| |
| /* handle new request */ |
| tasklet_schedule(&dd->done_task); |
| } |
| |
| static int atmel_sha_hw_init(struct atmel_sha_dev *dd) |
| { |
| int err; |
| |
| err = clk_enable(dd->iclk); |
| if (err) |
| return err; |
| |
| if (!(SHA_FLAGS_INIT & dd->flags)) { |
| atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST); |
| dd->flags |= SHA_FLAGS_INIT; |
| dd->err = 0; |
| } |
| |
| return 0; |
| } |
| |
| static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd) |
| { |
| return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff; |
| } |
| |
| static void atmel_sha_hw_version_init(struct atmel_sha_dev *dd) |
| { |
| atmel_sha_hw_init(dd); |
| |
| dd->hw_version = atmel_sha_get_version(dd); |
| |
| dev_info(dd->dev, |
| "version: 0x%x\n", dd->hw_version); |
| |
| clk_disable(dd->iclk); |
| } |
| |
| static int atmel_sha_handle_queue(struct atmel_sha_dev *dd, |
| struct ahash_request *req) |
| { |
| struct crypto_async_request *async_req, *backlog; |
| struct atmel_sha_reqctx *ctx; |
| unsigned long flags; |
| int err = 0, ret = 0; |
| |
| spin_lock_irqsave(&dd->lock, flags); |
| if (req) |
| ret = ahash_enqueue_request(&dd->queue, req); |
| |
| if (SHA_FLAGS_BUSY & dd->flags) { |
| spin_unlock_irqrestore(&dd->lock, flags); |
| return ret; |
| } |
| |
| backlog = crypto_get_backlog(&dd->queue); |
| async_req = crypto_dequeue_request(&dd->queue); |
| if (async_req) |
| dd->flags |= SHA_FLAGS_BUSY; |
| |
| spin_unlock_irqrestore(&dd->lock, flags); |
| |
| if (!async_req) |
| return ret; |
| |
| if (backlog) |
| backlog->complete(backlog, -EINPROGRESS); |
| |
| req = ahash_request_cast(async_req); |
| dd->req = req; |
| ctx = ahash_request_ctx(req); |
| |
| dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n", |
| ctx->op, req->nbytes); |
| |
| err = atmel_sha_hw_init(dd); |
| |
| if (err) |
| goto err1; |
| |
| if (ctx->op == SHA_OP_UPDATE) { |
| err = atmel_sha_update_req(dd); |
| if (err != -EINPROGRESS && (ctx->flags & SHA_FLAGS_FINUP)) |
| /* no final() after finup() */ |
| err = atmel_sha_final_req(dd); |
| } else if (ctx->op == SHA_OP_FINAL) { |
| err = atmel_sha_final_req(dd); |
| } |
| |
| err1: |
| if (err != -EINPROGRESS) |
| /* done_task will not finish it, so do it here */ |
| atmel_sha_finish_req(req, err); |
| |
| dev_dbg(dd->dev, "exit, err: %d\n", err); |
| |
| return ret; |
| } |
| |
| static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm); |
| struct atmel_sha_dev *dd = tctx->dd; |
| |
| ctx->op = op; |
| |
| return atmel_sha_handle_queue(dd, req); |
| } |
| |
| static int atmel_sha_update(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| |
| if (!req->nbytes) |
| return 0; |
| |
| ctx->total = req->nbytes; |
| ctx->sg = req->src; |
| ctx->offset = 0; |
| |
| if (ctx->flags & SHA_FLAGS_FINUP) { |
| if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD) |
| /* faster to use CPU for short transfers */ |
| ctx->flags |= SHA_FLAGS_CPU; |
| } else if (ctx->bufcnt + ctx->total < ctx->buflen) { |
| atmel_sha_append_sg(ctx); |
| return 0; |
| } |
| return atmel_sha_enqueue(req, SHA_OP_UPDATE); |
| } |
| |
| static int atmel_sha_final(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm); |
| struct atmel_sha_dev *dd = tctx->dd; |
| |
| int err = 0; |
| |
| ctx->flags |= SHA_FLAGS_FINUP; |
| |
| if (ctx->flags & SHA_FLAGS_ERROR) |
| return 0; /* uncompleted hash is not needed */ |
| |
| if (ctx->bufcnt) { |
| return atmel_sha_enqueue(req, SHA_OP_FINAL); |
| } else if (!(ctx->flags & SHA_FLAGS_PAD)) { /* add padding */ |
| err = atmel_sha_hw_init(dd); |
| if (err) |
| goto err1; |
| |
| dd->flags |= SHA_FLAGS_BUSY; |
| err = atmel_sha_final_req(dd); |
| } else { |
| /* copy ready hash (+ finalize hmac) */ |
| return atmel_sha_finish(req); |
| } |
| |
| err1: |
| if (err != -EINPROGRESS) |
| /* done_task will not finish it, so do it here */ |
| atmel_sha_finish_req(req, err); |
| |
| return err; |
| } |
| |
| static int atmel_sha_finup(struct ahash_request *req) |
| { |
| struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); |
| int err1, err2; |
| |
| ctx->flags |= SHA_FLAGS_FINUP; |
| |
| err1 = atmel_sha_update(req); |
| if (err1 == -EINPROGRESS || err1 == -EBUSY) |
| return err1; |
| |
| /* |
| * final() has to be always called to cleanup resources |
| * even if udpate() failed, except EINPROGRESS |
| */ |
| err2 = atmel_sha_final(req); |
| |
| return err1 ?: err2; |
| } |
| |
| static int atmel_sha_digest(struct ahash_request *req) |
| { |
| return atmel_sha_init(req) ?: atmel_sha_finup(req); |
| } |
| |
| static int atmel_sha_cra_init(struct crypto_tfm *tfm) |
| { |
| crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), |
| sizeof(struct atmel_sha_reqctx) + |
| SHA_BUFFER_LEN + SHA512_BLOCK_SIZE); |
| |
| return 0; |
| } |
| |
| static struct ahash_alg sha_1_256_algs[] = { |
| { |
| .init = atmel_sha_init, |
| .update = atmel_sha_update, |
| .final = atmel_sha_final, |
| .finup = atmel_sha_finup, |
| .digest = atmel_sha_digest, |
| .halg = { |
| .digestsize = SHA1_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha1", |
| .cra_driver_name = "atmel-sha1", |
| .cra_priority = 100, |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = SHA1_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct atmel_sha_ctx), |
| .cra_alignmask = 0, |
| .cra_module = THIS_MODULE, |
| .cra_init = atmel_sha_cra_init, |
| } |
| } |
| }, |
| { |
| .init = atmel_sha_init, |
| .update = atmel_sha_update, |
| .final = atmel_sha_final, |
| .finup = atmel_sha_finup, |
| .digest = atmel_sha_digest, |
| .halg = { |
| .digestsize = SHA256_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha256", |
| .cra_driver_name = "atmel-sha256", |
| .cra_priority = 100, |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = SHA256_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct atmel_sha_ctx), |
| .cra_alignmask = 0, |
| .cra_module = THIS_MODULE, |
| .cra_init = atmel_sha_cra_init, |
| } |
| } |
| }, |
| }; |
| |
| static struct ahash_alg sha_224_alg = { |
| .init = atmel_sha_init, |
| .update = atmel_sha_update, |
| .final = atmel_sha_final, |
| .finup = atmel_sha_finup, |
| .digest = atmel_sha_digest, |
| .halg = { |
| .digestsize = SHA224_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha224", |
| .cra_driver_name = "atmel-sha224", |
| .cra_priority = 100, |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = SHA224_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct atmel_sha_ctx), |
| .cra_alignmask = 0, |
| .cra_module = THIS_MODULE, |
| .cra_init = atmel_sha_cra_init, |
| } |
| } |
| }; |
| |
| static struct ahash_alg sha_384_512_algs[] = { |
| { |
| .init = atmel_sha_init, |
| .update = atmel_sha_update, |
| .final = atmel_sha_final, |
| .finup = atmel_sha_finup, |
| .digest = atmel_sha_digest, |
| .halg = { |
| .digestsize = SHA384_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha384", |
| .cra_driver_name = "atmel-sha384", |
| .cra_priority = 100, |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = SHA384_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct atmel_sha_ctx), |
| .cra_alignmask = 0x3, |
| .cra_module = THIS_MODULE, |
| .cra_init = atmel_sha_cra_init, |
| } |
| } |
| }, |
| { |
| .init = atmel_sha_init, |
| .update = atmel_sha_update, |
| .final = atmel_sha_final, |
| .finup = atmel_sha_finup, |
| .digest = atmel_sha_digest, |
| .halg = { |
| .digestsize = SHA512_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha512", |
| .cra_driver_name = "atmel-sha512", |
| .cra_priority = 100, |
| .cra_flags = CRYPTO_ALG_ASYNC, |
| .cra_blocksize = SHA512_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct atmel_sha_ctx), |
| .cra_alignmask = 0x3, |
| .cra_module = THIS_MODULE, |
| .cra_init = atmel_sha_cra_init, |
| } |
| } |
| }, |
| }; |
| |
| static void atmel_sha_done_task(unsigned long data) |
| { |
| struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data; |
| int err = 0; |
| |
| if (!(SHA_FLAGS_BUSY & dd->flags)) { |
| atmel_sha_handle_queue(dd, NULL); |
| return; |
| } |
| |
| if (SHA_FLAGS_CPU & dd->flags) { |
| if (SHA_FLAGS_OUTPUT_READY & dd->flags) { |
| dd->flags &= ~SHA_FLAGS_OUTPUT_READY; |
| goto finish; |
| } |
| } else if (SHA_FLAGS_DMA_READY & dd->flags) { |
| if (SHA_FLAGS_DMA_ACTIVE & dd->flags) { |
| dd->flags &= ~SHA_FLAGS_DMA_ACTIVE; |
| atmel_sha_update_dma_stop(dd); |
| if (dd->err) { |
| err = dd->err; |
| goto finish; |
| } |
| } |
| if (SHA_FLAGS_OUTPUT_READY & dd->flags) { |
| /* hash or semi-hash ready */ |
| dd->flags &= ~(SHA_FLAGS_DMA_READY | |
| SHA_FLAGS_OUTPUT_READY); |
| err = atmel_sha_update_dma_start(dd); |
| if (err != -EINPROGRESS) |
| goto finish; |
| } |
| } |
| return; |
| |
| finish: |
| /* finish curent request */ |
| atmel_sha_finish_req(dd->req, err); |
| } |
| |
| static irqreturn_t atmel_sha_irq(int irq, void *dev_id) |
| { |
| struct atmel_sha_dev *sha_dd = dev_id; |
| u32 reg; |
| |
| reg = atmel_sha_read(sha_dd, SHA_ISR); |
| if (reg & atmel_sha_read(sha_dd, SHA_IMR)) { |
| atmel_sha_write(sha_dd, SHA_IDR, reg); |
| if (SHA_FLAGS_BUSY & sha_dd->flags) { |
| sha_dd->flags |= SHA_FLAGS_OUTPUT_READY; |
| if (!(SHA_FLAGS_CPU & sha_dd->flags)) |
| sha_dd->flags |= SHA_FLAGS_DMA_READY; |
| tasklet_schedule(&sha_dd->done_task); |
| } else { |
| dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n"); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| return IRQ_NONE; |
| } |
| |
| static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) |
| crypto_unregister_ahash(&sha_1_256_algs[i]); |
| |
| if (dd->caps.has_sha224) |
| crypto_unregister_ahash(&sha_224_alg); |
| |
| if (dd->caps.has_sha_384_512) { |
| for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) |
| crypto_unregister_ahash(&sha_384_512_algs[i]); |
| } |
| } |
| |
| static int atmel_sha_register_algs(struct atmel_sha_dev *dd) |
| { |
| int err, i, j; |
| |
| for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) { |
| err = crypto_register_ahash(&sha_1_256_algs[i]); |
| if (err) |
| goto err_sha_1_256_algs; |
| } |
| |
| if (dd->caps.has_sha224) { |
| err = crypto_register_ahash(&sha_224_alg); |
| if (err) |
| goto err_sha_224_algs; |
| } |
| |
| if (dd->caps.has_sha_384_512) { |
| for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) { |
| err = crypto_register_ahash(&sha_384_512_algs[i]); |
| if (err) |
| goto err_sha_384_512_algs; |
| } |
| } |
| |
| return 0; |
| |
| err_sha_384_512_algs: |
| for (j = 0; j < i; j++) |
| crypto_unregister_ahash(&sha_384_512_algs[j]); |
| crypto_unregister_ahash(&sha_224_alg); |
| err_sha_224_algs: |
| i = ARRAY_SIZE(sha_1_256_algs); |
| err_sha_1_256_algs: |
| for (j = 0; j < i; j++) |
| crypto_unregister_ahash(&sha_1_256_algs[j]); |
| |
| return err; |
| } |
| |
| static bool atmel_sha_filter(struct dma_chan *chan, void *slave) |
| { |
| struct at_dma_slave *sl = slave; |
| |
| if (sl && sl->dma_dev == chan->device->dev) { |
| chan->private = sl; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| static int atmel_sha_dma_init(struct atmel_sha_dev *dd, |
| struct crypto_platform_data *pdata) |
| { |
| int err = -ENOMEM; |
| dma_cap_mask_t mask_in; |
| |
| /* Try to grab DMA channel */ |
| dma_cap_zero(mask_in); |
| dma_cap_set(DMA_SLAVE, mask_in); |
| |
| dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask_in, |
| atmel_sha_filter, &pdata->dma_slave->rxdata, dd->dev, "tx"); |
| if (!dd->dma_lch_in.chan) { |
| dev_warn(dd->dev, "no DMA channel available\n"); |
| return err; |
| } |
| |
| dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV; |
| dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base + |
| SHA_REG_DIN(0); |
| dd->dma_lch_in.dma_conf.src_maxburst = 1; |
| dd->dma_lch_in.dma_conf.src_addr_width = |
| DMA_SLAVE_BUSWIDTH_4_BYTES; |
| dd->dma_lch_in.dma_conf.dst_maxburst = 1; |
| dd->dma_lch_in.dma_conf.dst_addr_width = |
| DMA_SLAVE_BUSWIDTH_4_BYTES; |
| dd->dma_lch_in.dma_conf.device_fc = false; |
| |
| return 0; |
| } |
| |
| static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd) |
| { |
| dma_release_channel(dd->dma_lch_in.chan); |
| } |
| |
| static void atmel_sha_get_cap(struct atmel_sha_dev *dd) |
| { |
| |
| dd->caps.has_dma = 0; |
| dd->caps.has_dualbuff = 0; |
| dd->caps.has_sha224 = 0; |
| dd->caps.has_sha_384_512 = 0; |
| |
| /* keep only major version number */ |
| switch (dd->hw_version & 0xff0) { |
| case 0x420: |
| dd->caps.has_dma = 1; |
| dd->caps.has_dualbuff = 1; |
| dd->caps.has_sha224 = 1; |
| dd->caps.has_sha_384_512 = 1; |
| break; |
| case 0x410: |
| dd->caps.has_dma = 1; |
| dd->caps.has_dualbuff = 1; |
| dd->caps.has_sha224 = 1; |
| dd->caps.has_sha_384_512 = 1; |
| break; |
| case 0x400: |
| dd->caps.has_dma = 1; |
| dd->caps.has_dualbuff = 1; |
| dd->caps.has_sha224 = 1; |
| break; |
| case 0x320: |
| break; |
| default: |
| dev_warn(dd->dev, |
| "Unmanaged sha version, set minimum capabilities\n"); |
| break; |
| } |
| } |
| |
| #if defined(CONFIG_OF) |
| static const struct of_device_id atmel_sha_dt_ids[] = { |
| { .compatible = "atmel,at91sam9g46-sha" }, |
| { /* sentinel */ } |
| }; |
| |
| MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids); |
| |
| static struct crypto_platform_data *atmel_sha_of_init(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct crypto_platform_data *pdata; |
| |
| if (!np) { |
| dev_err(&pdev->dev, "device node not found\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) { |
| dev_err(&pdev->dev, "could not allocate memory for pdata\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| pdata->dma_slave = devm_kzalloc(&pdev->dev, |
| sizeof(*(pdata->dma_slave)), |
| GFP_KERNEL); |
| if (!pdata->dma_slave) { |
| dev_err(&pdev->dev, "could not allocate memory for dma_slave\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| return pdata; |
| } |
| #else /* CONFIG_OF */ |
| static inline struct crypto_platform_data *atmel_sha_of_init(struct platform_device *dev) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| #endif |
| |
| static int atmel_sha_probe(struct platform_device *pdev) |
| { |
| struct atmel_sha_dev *sha_dd; |
| struct crypto_platform_data *pdata; |
| struct device *dev = &pdev->dev; |
| struct resource *sha_res; |
| int err; |
| |
| sha_dd = devm_kzalloc(&pdev->dev, sizeof(*sha_dd), GFP_KERNEL); |
| if (sha_dd == NULL) { |
| dev_err(dev, "unable to alloc data struct.\n"); |
| err = -ENOMEM; |
| goto sha_dd_err; |
| } |
| |
| sha_dd->dev = dev; |
| |
| platform_set_drvdata(pdev, sha_dd); |
| |
| INIT_LIST_HEAD(&sha_dd->list); |
| spin_lock_init(&sha_dd->lock); |
| |
| tasklet_init(&sha_dd->done_task, atmel_sha_done_task, |
| (unsigned long)sha_dd); |
| |
| crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH); |
| |
| sha_dd->irq = -1; |
| |
| /* Get the base address */ |
| sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!sha_res) { |
| dev_err(dev, "no MEM resource info\n"); |
| err = -ENODEV; |
| goto res_err; |
| } |
| sha_dd->phys_base = sha_res->start; |
| |
| /* Get the IRQ */ |
| sha_dd->irq = platform_get_irq(pdev, 0); |
| if (sha_dd->irq < 0) { |
| dev_err(dev, "no IRQ resource info\n"); |
| err = sha_dd->irq; |
| goto res_err; |
| } |
| |
| err = devm_request_irq(&pdev->dev, sha_dd->irq, atmel_sha_irq, |
| IRQF_SHARED, "atmel-sha", sha_dd); |
| if (err) { |
| dev_err(dev, "unable to request sha irq.\n"); |
| goto res_err; |
| } |
| |
| /* Initializing the clock */ |
| sha_dd->iclk = devm_clk_get(&pdev->dev, "sha_clk"); |
| if (IS_ERR(sha_dd->iclk)) { |
| dev_err(dev, "clock initialization failed.\n"); |
| err = PTR_ERR(sha_dd->iclk); |
| goto res_err; |
| } |
| |
| sha_dd->io_base = devm_ioremap_resource(&pdev->dev, sha_res); |
| if (!sha_dd->io_base) { |
| dev_err(dev, "can't ioremap\n"); |
| err = -ENOMEM; |
| goto res_err; |
| } |
| |
| err = clk_prepare(sha_dd->iclk); |
| if (err) |
| goto res_err; |
| |
| atmel_sha_hw_version_init(sha_dd); |
| |
| atmel_sha_get_cap(sha_dd); |
| |
| if (sha_dd->caps.has_dma) { |
| pdata = pdev->dev.platform_data; |
| if (!pdata) { |
| pdata = atmel_sha_of_init(pdev); |
| if (IS_ERR(pdata)) { |
| dev_err(&pdev->dev, "platform data not available\n"); |
| err = PTR_ERR(pdata); |
| goto iclk_unprepare; |
| } |
| } |
| if (!pdata->dma_slave) { |
| err = -ENXIO; |
| goto iclk_unprepare; |
| } |
| err = atmel_sha_dma_init(sha_dd, pdata); |
| if (err) |
| goto err_sha_dma; |
| |
| dev_info(dev, "using %s for DMA transfers\n", |
| dma_chan_name(sha_dd->dma_lch_in.chan)); |
| } |
| |
| spin_lock(&atmel_sha.lock); |
| list_add_tail(&sha_dd->list, &atmel_sha.dev_list); |
| spin_unlock(&atmel_sha.lock); |
| |
| err = atmel_sha_register_algs(sha_dd); |
| if (err) |
| goto err_algs; |
| |
| dev_info(dev, "Atmel SHA1/SHA256%s%s\n", |
| sha_dd->caps.has_sha224 ? "/SHA224" : "", |
| sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : ""); |
| |
| return 0; |
| |
| err_algs: |
| spin_lock(&atmel_sha.lock); |
| list_del(&sha_dd->list); |
| spin_unlock(&atmel_sha.lock); |
| if (sha_dd->caps.has_dma) |
| atmel_sha_dma_cleanup(sha_dd); |
| err_sha_dma: |
| iclk_unprepare: |
| clk_unprepare(sha_dd->iclk); |
| res_err: |
| tasklet_kill(&sha_dd->done_task); |
| sha_dd_err: |
| dev_err(dev, "initialization failed.\n"); |
| |
| return err; |
| } |
| |
| static int atmel_sha_remove(struct platform_device *pdev) |
| { |
| static struct atmel_sha_dev *sha_dd; |
| |
| sha_dd = platform_get_drvdata(pdev); |
| if (!sha_dd) |
| return -ENODEV; |
| spin_lock(&atmel_sha.lock); |
| list_del(&sha_dd->list); |
| spin_unlock(&atmel_sha.lock); |
| |
| atmel_sha_unregister_algs(sha_dd); |
| |
| tasklet_kill(&sha_dd->done_task); |
| |
| if (sha_dd->caps.has_dma) |
| atmel_sha_dma_cleanup(sha_dd); |
| |
| clk_unprepare(sha_dd->iclk); |
| |
| return 0; |
| } |
| |
| static struct platform_driver atmel_sha_driver = { |
| .probe = atmel_sha_probe, |
| .remove = atmel_sha_remove, |
| .driver = { |
| .name = "atmel_sha", |
| .of_match_table = of_match_ptr(atmel_sha_dt_ids), |
| }, |
| }; |
| |
| module_platform_driver(atmel_sha_driver); |
| |
| MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support."); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique"); |