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1309 lines
31 KiB
1309 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Cryptographic API. |
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* |
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* Support for ATMEL DES/TDES HW acceleration. |
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* |
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* Copyright (c) 2012 Eukréa Electromatique - ATMEL |
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* Author: Nicolas Royer <[email protected]> |
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* |
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* Some ideas are from omap-aes.c drivers. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/hw_random.h> |
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#include <linux/platform_device.h> |
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|
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#include <linux/device.h> |
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#include <linux/dmaengine.h> |
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#include <linux/init.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/scatterlist.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/of_device.h> |
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#include <linux/delay.h> |
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#include <linux/crypto.h> |
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#include <crypto/scatterwalk.h> |
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#include <crypto/algapi.h> |
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#include <crypto/internal/des.h> |
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#include <crypto/internal/skcipher.h> |
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#include "atmel-tdes-regs.h" |
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#define ATMEL_TDES_PRIORITY 300 |
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|
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/* TDES flags */ |
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/* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */ |
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#define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC |
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#define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK) |
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#define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB |
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#define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC |
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#define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB |
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#define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b) |
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#define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b) |
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#define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b) |
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#define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b) |
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#define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT) |
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|
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#define TDES_FLAGS_INIT BIT(3) |
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#define TDES_FLAGS_FAST BIT(4) |
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#define TDES_FLAGS_BUSY BIT(5) |
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#define TDES_FLAGS_DMA BIT(6) |
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|
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#define ATMEL_TDES_QUEUE_LENGTH 50 |
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|
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#define CFB8_BLOCK_SIZE 1 |
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#define CFB16_BLOCK_SIZE 2 |
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#define CFB32_BLOCK_SIZE 4 |
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struct atmel_tdes_caps { |
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bool has_dma; |
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u32 has_cfb_3keys; |
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}; |
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struct atmel_tdes_dev; |
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struct atmel_tdes_ctx { |
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struct atmel_tdes_dev *dd; |
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|
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int keylen; |
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u32 key[DES3_EDE_KEY_SIZE / sizeof(u32)]; |
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unsigned long flags; |
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|
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u16 block_size; |
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}; |
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struct atmel_tdes_reqctx { |
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unsigned long mode; |
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u8 lastc[DES_BLOCK_SIZE]; |
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}; |
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struct atmel_tdes_dma { |
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struct dma_chan *chan; |
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struct dma_slave_config dma_conf; |
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}; |
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struct atmel_tdes_dev { |
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struct list_head list; |
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unsigned long phys_base; |
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void __iomem *io_base; |
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struct atmel_tdes_ctx *ctx; |
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struct device *dev; |
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struct clk *iclk; |
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int irq; |
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unsigned long flags; |
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spinlock_t lock; |
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struct crypto_queue queue; |
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struct tasklet_struct done_task; |
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struct tasklet_struct queue_task; |
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struct skcipher_request *req; |
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size_t total; |
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struct scatterlist *in_sg; |
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unsigned int nb_in_sg; |
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size_t in_offset; |
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struct scatterlist *out_sg; |
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unsigned int nb_out_sg; |
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size_t out_offset; |
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|
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size_t buflen; |
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size_t dma_size; |
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|
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void *buf_in; |
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int dma_in; |
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dma_addr_t dma_addr_in; |
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struct atmel_tdes_dma dma_lch_in; |
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|
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void *buf_out; |
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int dma_out; |
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dma_addr_t dma_addr_out; |
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struct atmel_tdes_dma dma_lch_out; |
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struct atmel_tdes_caps caps; |
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u32 hw_version; |
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}; |
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struct atmel_tdes_drv { |
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struct list_head dev_list; |
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spinlock_t lock; |
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}; |
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static struct atmel_tdes_drv atmel_tdes = { |
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.dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list), |
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.lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock), |
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}; |
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static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset, |
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void *buf, size_t buflen, size_t total, int out) |
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{ |
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size_t count, off = 0; |
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|
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while (buflen && total) { |
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count = min((*sg)->length - *offset, total); |
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count = min(count, buflen); |
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|
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if (!count) |
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return off; |
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scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out); |
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off += count; |
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buflen -= count; |
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*offset += count; |
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total -= count; |
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|
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if (*offset == (*sg)->length) { |
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*sg = sg_next(*sg); |
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if (*sg) |
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*offset = 0; |
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else |
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total = 0; |
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} |
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} |
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return off; |
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} |
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static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset) |
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{ |
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return readl_relaxed(dd->io_base + offset); |
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} |
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static inline void atmel_tdes_write(struct atmel_tdes_dev *dd, |
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u32 offset, u32 value) |
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{ |
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writel_relaxed(value, dd->io_base + offset); |
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} |
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static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset, |
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const u32 *value, int count) |
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{ |
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for (; count--; value++, offset += 4) |
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atmel_tdes_write(dd, offset, *value); |
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} |
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static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx) |
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{ |
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struct atmel_tdes_dev *tdes_dd = NULL; |
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struct atmel_tdes_dev *tmp; |
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|
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spin_lock_bh(&atmel_tdes.lock); |
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if (!ctx->dd) { |
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list_for_each_entry(tmp, &atmel_tdes.dev_list, list) { |
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tdes_dd = tmp; |
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break; |
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} |
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ctx->dd = tdes_dd; |
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} else { |
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tdes_dd = ctx->dd; |
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} |
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spin_unlock_bh(&atmel_tdes.lock); |
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return tdes_dd; |
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} |
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static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd) |
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{ |
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int err; |
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err = clk_prepare_enable(dd->iclk); |
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if (err) |
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return err; |
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if (!(dd->flags & TDES_FLAGS_INIT)) { |
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atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST); |
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dd->flags |= TDES_FLAGS_INIT; |
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} |
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return 0; |
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} |
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static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd) |
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{ |
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return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff; |
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} |
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static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd) |
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{ |
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int err; |
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err = atmel_tdes_hw_init(dd); |
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if (err) |
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return err; |
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dd->hw_version = atmel_tdes_get_version(dd); |
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dev_info(dd->dev, |
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"version: 0x%x\n", dd->hw_version); |
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clk_disable_unprepare(dd->iclk); |
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return 0; |
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} |
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static void atmel_tdes_dma_callback(void *data) |
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{ |
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struct atmel_tdes_dev *dd = data; |
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|
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/* dma_lch_out - completed */ |
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tasklet_schedule(&dd->done_task); |
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} |
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static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd) |
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{ |
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int err; |
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u32 valmr = TDES_MR_SMOD_PDC; |
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err = atmel_tdes_hw_init(dd); |
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if (err) |
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return err; |
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if (!dd->caps.has_dma) |
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atmel_tdes_write(dd, TDES_PTCR, |
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TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS); |
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/* MR register must be set before IV registers */ |
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if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) { |
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valmr |= TDES_MR_KEYMOD_3KEY; |
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valmr |= TDES_MR_TDESMOD_TDES; |
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} else if (dd->ctx->keylen > DES_KEY_SIZE) { |
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valmr |= TDES_MR_KEYMOD_2KEY; |
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valmr |= TDES_MR_TDESMOD_TDES; |
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} else { |
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valmr |= TDES_MR_TDESMOD_DES; |
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} |
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valmr |= dd->flags & TDES_FLAGS_MODE_MASK; |
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atmel_tdes_write(dd, TDES_MR, valmr); |
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atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key, |
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dd->ctx->keylen >> 2); |
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if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB) |
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atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2); |
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return 0; |
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} |
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static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd) |
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{ |
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int err = 0; |
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size_t count; |
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atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); |
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if (dd->flags & TDES_FLAGS_FAST) { |
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dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); |
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dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
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} else { |
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dma_sync_single_for_device(dd->dev, dd->dma_addr_out, |
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dd->dma_size, DMA_FROM_DEVICE); |
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/* copy data */ |
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count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset, |
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dd->buf_out, dd->buflen, dd->dma_size, 1); |
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if (count != dd->dma_size) { |
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err = -EINVAL; |
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pr_err("not all data converted: %zu\n", count); |
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} |
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} |
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return err; |
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} |
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static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd) |
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{ |
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int err = -ENOMEM; |
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dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0); |
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dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0); |
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dd->buflen = PAGE_SIZE; |
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dd->buflen &= ~(DES_BLOCK_SIZE - 1); |
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if (!dd->buf_in || !dd->buf_out) { |
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dev_err(dd->dev, "unable to alloc pages.\n"); |
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goto err_alloc; |
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} |
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/* MAP here */ |
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dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, |
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dd->buflen, DMA_TO_DEVICE); |
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if (dma_mapping_error(dd->dev, dd->dma_addr_in)) { |
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dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen); |
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err = -EINVAL; |
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goto err_map_in; |
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} |
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dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, |
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dd->buflen, DMA_FROM_DEVICE); |
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if (dma_mapping_error(dd->dev, dd->dma_addr_out)) { |
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dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen); |
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err = -EINVAL; |
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goto err_map_out; |
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} |
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return 0; |
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err_map_out: |
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dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, |
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DMA_TO_DEVICE); |
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err_map_in: |
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err_alloc: |
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free_page((unsigned long)dd->buf_out); |
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free_page((unsigned long)dd->buf_in); |
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if (err) |
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pr_err("error: %d\n", err); |
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return err; |
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} |
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static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd) |
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{ |
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dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen, |
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DMA_FROM_DEVICE); |
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dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, |
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DMA_TO_DEVICE); |
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free_page((unsigned long)dd->buf_out); |
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free_page((unsigned long)dd->buf_in); |
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} |
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static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd, |
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dma_addr_t dma_addr_in, |
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dma_addr_t dma_addr_out, int length) |
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{ |
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struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req); |
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int len32; |
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dd->dma_size = length; |
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if (!(dd->flags & TDES_FLAGS_FAST)) { |
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dma_sync_single_for_device(dd->dev, dma_addr_in, length, |
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DMA_TO_DEVICE); |
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} |
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switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) { |
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case TDES_FLAGS_CFB8: |
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len32 = DIV_ROUND_UP(length, sizeof(u8)); |
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break; |
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case TDES_FLAGS_CFB16: |
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len32 = DIV_ROUND_UP(length, sizeof(u16)); |
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break; |
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default: |
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len32 = DIV_ROUND_UP(length, sizeof(u32)); |
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break; |
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} |
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atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); |
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atmel_tdes_write(dd, TDES_TPR, dma_addr_in); |
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atmel_tdes_write(dd, TDES_TCR, len32); |
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atmel_tdes_write(dd, TDES_RPR, dma_addr_out); |
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atmel_tdes_write(dd, TDES_RCR, len32); |
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/* Enable Interrupt */ |
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atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX); |
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|
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/* Start DMA transfer */ |
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atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN); |
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return 0; |
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} |
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static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd, |
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dma_addr_t dma_addr_in, |
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dma_addr_t dma_addr_out, int length) |
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{ |
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struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req); |
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struct scatterlist sg[2]; |
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struct dma_async_tx_descriptor *in_desc, *out_desc; |
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enum dma_slave_buswidth addr_width; |
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dd->dma_size = length; |
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if (!(dd->flags & TDES_FLAGS_FAST)) { |
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dma_sync_single_for_device(dd->dev, dma_addr_in, length, |
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DMA_TO_DEVICE); |
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} |
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|
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switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) { |
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case TDES_FLAGS_CFB8: |
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addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
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break; |
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|
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case TDES_FLAGS_CFB16: |
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addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; |
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break; |
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|
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default: |
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addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
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break; |
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} |
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|
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dd->dma_lch_in.dma_conf.dst_addr_width = addr_width; |
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dd->dma_lch_out.dma_conf.src_addr_width = addr_width; |
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|
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dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf); |
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dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf); |
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dd->flags |= TDES_FLAGS_DMA; |
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|
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sg_init_table(&sg[0], 1); |
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sg_dma_address(&sg[0]) = dma_addr_in; |
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sg_dma_len(&sg[0]) = length; |
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|
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sg_init_table(&sg[1], 1); |
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sg_dma_address(&sg[1]) = dma_addr_out; |
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sg_dma_len(&sg[1]) = length; |
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|
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in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0], |
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1, DMA_MEM_TO_DEV, |
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
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if (!in_desc) |
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return -EINVAL; |
|
|
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out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1], |
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1, DMA_DEV_TO_MEM, |
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
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if (!out_desc) |
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return -EINVAL; |
|
|
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out_desc->callback = atmel_tdes_dma_callback; |
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out_desc->callback_param = dd; |
|
|
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dmaengine_submit(out_desc); |
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dma_async_issue_pending(dd->dma_lch_out.chan); |
|
|
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dmaengine_submit(in_desc); |
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dma_async_issue_pending(dd->dma_lch_in.chan); |
|
|
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return 0; |
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} |
|
|
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static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd) |
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{ |
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int err, fast = 0, in, out; |
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size_t count; |
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dma_addr_t addr_in, addr_out; |
|
|
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if ((!dd->in_offset) && (!dd->out_offset)) { |
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/* check for alignment */ |
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in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) && |
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IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size); |
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out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) && |
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IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size); |
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fast = in && out; |
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|
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if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg)) |
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fast = 0; |
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} |
|
|
|
|
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if (fast) { |
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count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg)); |
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count = min_t(size_t, count, sg_dma_len(dd->out_sg)); |
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|
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err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
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if (!err) { |
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dev_err(dd->dev, "dma_map_sg() error\n"); |
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return -EINVAL; |
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} |
|
|
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err = dma_map_sg(dd->dev, dd->out_sg, 1, |
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DMA_FROM_DEVICE); |
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if (!err) { |
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dev_err(dd->dev, "dma_map_sg() error\n"); |
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dma_unmap_sg(dd->dev, dd->in_sg, 1, |
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DMA_TO_DEVICE); |
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return -EINVAL; |
|
} |
|
|
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addr_in = sg_dma_address(dd->in_sg); |
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addr_out = sg_dma_address(dd->out_sg); |
|
|
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dd->flags |= TDES_FLAGS_FAST; |
|
|
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} else { |
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/* use cache buffers */ |
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count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset, |
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dd->buf_in, dd->buflen, dd->total, 0); |
|
|
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addr_in = dd->dma_addr_in; |
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addr_out = dd->dma_addr_out; |
|
|
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dd->flags &= ~TDES_FLAGS_FAST; |
|
} |
|
|
|
dd->total -= count; |
|
|
|
if (dd->caps.has_dma) |
|
err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count); |
|
else |
|
err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count); |
|
|
|
if (err && (dd->flags & TDES_FLAGS_FAST)) { |
|
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
|
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static void |
|
atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd) |
|
{ |
|
struct skcipher_request *req = dd->req; |
|
struct atmel_tdes_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 & TDES_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 void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err) |
|
{ |
|
struct skcipher_request *req = dd->req; |
|
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req); |
|
|
|
clk_disable_unprepare(dd->iclk); |
|
|
|
dd->flags &= ~TDES_FLAGS_BUSY; |
|
|
|
if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB) |
|
atmel_tdes_set_iv_as_last_ciphertext_block(dd); |
|
|
|
req->base.complete(&req->base, err); |
|
} |
|
|
|
static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd, |
|
struct skcipher_request *req) |
|
{ |
|
struct crypto_async_request *async_req, *backlog; |
|
struct atmel_tdes_ctx *ctx; |
|
struct atmel_tdes_reqctx *rctx; |
|
unsigned long flags; |
|
int err, ret = 0; |
|
|
|
spin_lock_irqsave(&dd->lock, flags); |
|
if (req) |
|
ret = crypto_enqueue_request(&dd->queue, &req->base); |
|
if (dd->flags & TDES_FLAGS_BUSY) { |
|
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 |= TDES_FLAGS_BUSY; |
|
spin_unlock_irqrestore(&dd->lock, flags); |
|
|
|
if (!async_req) |
|
return ret; |
|
|
|
if (backlog) |
|
backlog->complete(backlog, -EINPROGRESS); |
|
|
|
req = skcipher_request_cast(async_req); |
|
|
|
/* assign new request to device */ |
|
dd->req = req; |
|
dd->total = req->cryptlen; |
|
dd->in_offset = 0; |
|
dd->in_sg = req->src; |
|
dd->out_offset = 0; |
|
dd->out_sg = req->dst; |
|
|
|
rctx = skcipher_request_ctx(req); |
|
ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); |
|
rctx->mode &= TDES_FLAGS_MODE_MASK; |
|
dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode; |
|
dd->ctx = ctx; |
|
ctx->dd = dd; |
|
|
|
err = atmel_tdes_write_ctrl(dd); |
|
if (!err) |
|
err = atmel_tdes_crypt_start(dd); |
|
if (err) { |
|
/* des_task will not finish it, so do it here */ |
|
atmel_tdes_finish_req(dd, err); |
|
tasklet_schedule(&dd->queue_task); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd) |
|
{ |
|
int err = -EINVAL; |
|
size_t count; |
|
|
|
if (dd->flags & TDES_FLAGS_DMA) { |
|
err = 0; |
|
if (dd->flags & TDES_FLAGS_FAST) { |
|
dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); |
|
dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
|
} else { |
|
dma_sync_single_for_device(dd->dev, dd->dma_addr_out, |
|
dd->dma_size, DMA_FROM_DEVICE); |
|
|
|
/* copy data */ |
|
count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset, |
|
dd->buf_out, dd->buflen, dd->dma_size, 1); |
|
if (count != dd->dma_size) { |
|
err = -EINVAL; |
|
pr_err("not all data converted: %zu\n", count); |
|
} |
|
} |
|
} |
|
return err; |
|
} |
|
|
|
static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode) |
|
{ |
|
struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); |
|
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher); |
|
struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req); |
|
|
|
switch (mode & TDES_FLAGS_OPMODE_MASK) { |
|
case TDES_FLAGS_CFB8: |
|
if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) { |
|
pr_err("request size is not exact amount of CFB8 blocks\n"); |
|
return -EINVAL; |
|
} |
|
ctx->block_size = CFB8_BLOCK_SIZE; |
|
break; |
|
|
|
case TDES_FLAGS_CFB16: |
|
if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) { |
|
pr_err("request size is not exact amount of CFB16 blocks\n"); |
|
return -EINVAL; |
|
} |
|
ctx->block_size = CFB16_BLOCK_SIZE; |
|
break; |
|
|
|
case TDES_FLAGS_CFB32: |
|
if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) { |
|
pr_err("request size is not exact amount of CFB32 blocks\n"); |
|
return -EINVAL; |
|
} |
|
ctx->block_size = CFB32_BLOCK_SIZE; |
|
break; |
|
|
|
default: |
|
if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) { |
|
pr_err("request size is not exact amount of DES blocks\n"); |
|
return -EINVAL; |
|
} |
|
ctx->block_size = DES_BLOCK_SIZE; |
|
break; |
|
} |
|
|
|
rctx->mode = mode; |
|
|
|
if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB && |
|
!(mode & TDES_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_tdes_handle_queue(ctx->dd, req); |
|
} |
|
|
|
static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd) |
|
{ |
|
int ret; |
|
|
|
/* Try to grab 2 DMA channels */ |
|
dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx"); |
|
if (IS_ERR(dd->dma_lch_in.chan)) { |
|
ret = PTR_ERR(dd->dma_lch_in.chan); |
|
goto err_dma_in; |
|
} |
|
|
|
dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base + |
|
TDES_IDATA1R; |
|
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; |
|
|
|
dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx"); |
|
if (IS_ERR(dd->dma_lch_out.chan)) { |
|
ret = PTR_ERR(dd->dma_lch_out.chan); |
|
goto err_dma_out; |
|
} |
|
|
|
dd->dma_lch_out.dma_conf.src_addr = dd->phys_base + |
|
TDES_ODATA1R; |
|
dd->dma_lch_out.dma_conf.src_maxburst = 1; |
|
dd->dma_lch_out.dma_conf.src_addr_width = |
|
DMA_SLAVE_BUSWIDTH_4_BYTES; |
|
dd->dma_lch_out.dma_conf.dst_maxburst = 1; |
|
dd->dma_lch_out.dma_conf.dst_addr_width = |
|
DMA_SLAVE_BUSWIDTH_4_BYTES; |
|
dd->dma_lch_out.dma_conf.device_fc = false; |
|
|
|
return 0; |
|
|
|
err_dma_out: |
|
dma_release_channel(dd->dma_lch_in.chan); |
|
err_dma_in: |
|
dev_err(dd->dev, "no DMA channel available\n"); |
|
return ret; |
|
} |
|
|
|
static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd) |
|
{ |
|
dma_release_channel(dd->dma_lch_in.chan); |
|
dma_release_channel(dd->dma_lch_out.chan); |
|
} |
|
|
|
static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key, |
|
unsigned int keylen) |
|
{ |
|
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); |
|
int err; |
|
|
|
err = verify_skcipher_des_key(tfm, key); |
|
if (err) |
|
return err; |
|
|
|
memcpy(ctx->key, key, keylen); |
|
ctx->keylen = keylen; |
|
|
|
return 0; |
|
} |
|
|
|
static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key, |
|
unsigned int keylen) |
|
{ |
|
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); |
|
int err; |
|
|
|
err = verify_skcipher_des3_key(tfm, key); |
|
if (err) |
|
return err; |
|
|
|
memcpy(ctx->key, key, keylen); |
|
ctx->keylen = keylen; |
|
|
|
return 0; |
|
} |
|
|
|
static int atmel_tdes_ecb_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_ecb_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_ECB); |
|
} |
|
|
|
static int atmel_tdes_cbc_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_cbc_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CBC); |
|
} |
|
static int atmel_tdes_cfb_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_cfb_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB64); |
|
} |
|
|
|
static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB8); |
|
} |
|
|
|
static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB16); |
|
} |
|
|
|
static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_CFB32); |
|
} |
|
|
|
static int atmel_tdes_ofb_encrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT); |
|
} |
|
|
|
static int atmel_tdes_ofb_decrypt(struct skcipher_request *req) |
|
{ |
|
return atmel_tdes_crypt(req, TDES_FLAGS_OFB); |
|
} |
|
|
|
static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm) |
|
{ |
|
struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm); |
|
struct atmel_tdes_dev *dd; |
|
|
|
crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx)); |
|
|
|
dd = atmel_tdes_find_dev(ctx); |
|
if (!dd) |
|
return -ENODEV; |
|
|
|
return 0; |
|
} |
|
|
|
static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg) |
|
{ |
|
alg->base.cra_priority = ATMEL_TDES_PRIORITY; |
|
alg->base.cra_flags = CRYPTO_ALG_ASYNC; |
|
alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx); |
|
alg->base.cra_module = THIS_MODULE; |
|
|
|
alg->init = atmel_tdes_init_tfm; |
|
} |
|
|
|
static struct skcipher_alg tdes_algs[] = { |
|
{ |
|
.base.cra_name = "ecb(des)", |
|
.base.cra_driver_name = "atmel-ecb-des", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_ecb_encrypt, |
|
.decrypt = atmel_tdes_ecb_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cbc(des)", |
|
.base.cra_driver_name = "atmel-cbc-des", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_cbc_encrypt, |
|
.decrypt = atmel_tdes_cbc_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cfb(des)", |
|
.base.cra_driver_name = "atmel-cfb-des", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_cfb_encrypt, |
|
.decrypt = atmel_tdes_cfb_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cfb8(des)", |
|
.base.cra_driver_name = "atmel-cfb8-des", |
|
.base.cra_blocksize = CFB8_BLOCK_SIZE, |
|
.base.cra_alignmask = 0, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_cfb8_encrypt, |
|
.decrypt = atmel_tdes_cfb8_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cfb16(des)", |
|
.base.cra_driver_name = "atmel-cfb16-des", |
|
.base.cra_blocksize = CFB16_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x1, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_cfb16_encrypt, |
|
.decrypt = atmel_tdes_cfb16_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cfb32(des)", |
|
.base.cra_driver_name = "atmel-cfb32-des", |
|
.base.cra_blocksize = CFB32_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x3, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_cfb32_encrypt, |
|
.decrypt = atmel_tdes_cfb32_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "ofb(des)", |
|
.base.cra_driver_name = "atmel-ofb-des", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES_KEY_SIZE, |
|
.max_keysize = DES_KEY_SIZE, |
|
.ivsize = DES_BLOCK_SIZE, |
|
.setkey = atmel_des_setkey, |
|
.encrypt = atmel_tdes_ofb_encrypt, |
|
.decrypt = atmel_tdes_ofb_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "ecb(des3_ede)", |
|
.base.cra_driver_name = "atmel-ecb-tdes", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES3_EDE_KEY_SIZE, |
|
.max_keysize = DES3_EDE_KEY_SIZE, |
|
.setkey = atmel_tdes_setkey, |
|
.encrypt = atmel_tdes_ecb_encrypt, |
|
.decrypt = atmel_tdes_ecb_decrypt, |
|
}, |
|
{ |
|
.base.cra_name = "cbc(des3_ede)", |
|
.base.cra_driver_name = "atmel-cbc-tdes", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES3_EDE_KEY_SIZE, |
|
.max_keysize = DES3_EDE_KEY_SIZE, |
|
.setkey = atmel_tdes_setkey, |
|
.encrypt = atmel_tdes_cbc_encrypt, |
|
.decrypt = atmel_tdes_cbc_decrypt, |
|
.ivsize = DES_BLOCK_SIZE, |
|
}, |
|
{ |
|
.base.cra_name = "ofb(des3_ede)", |
|
.base.cra_driver_name = "atmel-ofb-tdes", |
|
.base.cra_blocksize = DES_BLOCK_SIZE, |
|
.base.cra_alignmask = 0x7, |
|
|
|
.min_keysize = DES3_EDE_KEY_SIZE, |
|
.max_keysize = DES3_EDE_KEY_SIZE, |
|
.setkey = atmel_tdes_setkey, |
|
.encrypt = atmel_tdes_ofb_encrypt, |
|
.decrypt = atmel_tdes_ofb_decrypt, |
|
.ivsize = DES_BLOCK_SIZE, |
|
}, |
|
}; |
|
|
|
static void atmel_tdes_queue_task(unsigned long data) |
|
{ |
|
struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data; |
|
|
|
atmel_tdes_handle_queue(dd, NULL); |
|
} |
|
|
|
static void atmel_tdes_done_task(unsigned long data) |
|
{ |
|
struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data; |
|
int err; |
|
|
|
if (!(dd->flags & TDES_FLAGS_DMA)) |
|
err = atmel_tdes_crypt_pdc_stop(dd); |
|
else |
|
err = atmel_tdes_crypt_dma_stop(dd); |
|
|
|
if (dd->total && !err) { |
|
if (dd->flags & TDES_FLAGS_FAST) { |
|
dd->in_sg = sg_next(dd->in_sg); |
|
dd->out_sg = sg_next(dd->out_sg); |
|
if (!dd->in_sg || !dd->out_sg) |
|
err = -EINVAL; |
|
} |
|
if (!err) |
|
err = atmel_tdes_crypt_start(dd); |
|
if (!err) |
|
return; /* DMA started. Not fininishing. */ |
|
} |
|
|
|
atmel_tdes_finish_req(dd, err); |
|
atmel_tdes_handle_queue(dd, NULL); |
|
} |
|
|
|
static irqreturn_t atmel_tdes_irq(int irq, void *dev_id) |
|
{ |
|
struct atmel_tdes_dev *tdes_dd = dev_id; |
|
u32 reg; |
|
|
|
reg = atmel_tdes_read(tdes_dd, TDES_ISR); |
|
if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) { |
|
atmel_tdes_write(tdes_dd, TDES_IDR, reg); |
|
if (TDES_FLAGS_BUSY & tdes_dd->flags) |
|
tasklet_schedule(&tdes_dd->done_task); |
|
else |
|
dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n"); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
return IRQ_NONE; |
|
} |
|
|
|
static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) |
|
crypto_unregister_skcipher(&tdes_algs[i]); |
|
} |
|
|
|
static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd) |
|
{ |
|
int err, i, j; |
|
|
|
for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) { |
|
atmel_tdes_skcipher_alg_init(&tdes_algs[i]); |
|
|
|
err = crypto_register_skcipher(&tdes_algs[i]); |
|
if (err) |
|
goto err_tdes_algs; |
|
} |
|
|
|
return 0; |
|
|
|
err_tdes_algs: |
|
for (j = 0; j < i; j++) |
|
crypto_unregister_skcipher(&tdes_algs[j]); |
|
|
|
return err; |
|
} |
|
|
|
static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd) |
|
{ |
|
|
|
dd->caps.has_dma = 0; |
|
dd->caps.has_cfb_3keys = 0; |
|
|
|
/* keep only major version number */ |
|
switch (dd->hw_version & 0xf00) { |
|
case 0x700: |
|
dd->caps.has_dma = 1; |
|
dd->caps.has_cfb_3keys = 1; |
|
break; |
|
case 0x600: |
|
break; |
|
default: |
|
dev_warn(dd->dev, |
|
"Unmanaged tdes version, set minimum capabilities\n"); |
|
break; |
|
} |
|
} |
|
|
|
#if defined(CONFIG_OF) |
|
static const struct of_device_id atmel_tdes_dt_ids[] = { |
|
{ .compatible = "atmel,at91sam9g46-tdes" }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids); |
|
#endif |
|
|
|
static int atmel_tdes_probe(struct platform_device *pdev) |
|
{ |
|
struct atmel_tdes_dev *tdes_dd; |
|
struct device *dev = &pdev->dev; |
|
struct resource *tdes_res; |
|
int err; |
|
|
|
tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL); |
|
if (!tdes_dd) |
|
return -ENOMEM; |
|
|
|
tdes_dd->dev = dev; |
|
|
|
platform_set_drvdata(pdev, tdes_dd); |
|
|
|
INIT_LIST_HEAD(&tdes_dd->list); |
|
spin_lock_init(&tdes_dd->lock); |
|
|
|
tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task, |
|
(unsigned long)tdes_dd); |
|
tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task, |
|
(unsigned long)tdes_dd); |
|
|
|
crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH); |
|
|
|
/* Get the base address */ |
|
tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
if (!tdes_res) { |
|
dev_err(dev, "no MEM resource info\n"); |
|
err = -ENODEV; |
|
goto err_tasklet_kill; |
|
} |
|
tdes_dd->phys_base = tdes_res->start; |
|
|
|
/* Get the IRQ */ |
|
tdes_dd->irq = platform_get_irq(pdev, 0); |
|
if (tdes_dd->irq < 0) { |
|
err = tdes_dd->irq; |
|
goto err_tasklet_kill; |
|
} |
|
|
|
err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq, |
|
IRQF_SHARED, "atmel-tdes", tdes_dd); |
|
if (err) { |
|
dev_err(dev, "unable to request tdes irq.\n"); |
|
goto err_tasklet_kill; |
|
} |
|
|
|
/* Initializing the clock */ |
|
tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk"); |
|
if (IS_ERR(tdes_dd->iclk)) { |
|
dev_err(dev, "clock initialization failed.\n"); |
|
err = PTR_ERR(tdes_dd->iclk); |
|
goto err_tasklet_kill; |
|
} |
|
|
|
tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res); |
|
if (IS_ERR(tdes_dd->io_base)) { |
|
dev_err(dev, "can't ioremap\n"); |
|
err = PTR_ERR(tdes_dd->io_base); |
|
goto err_tasklet_kill; |
|
} |
|
|
|
err = atmel_tdes_hw_version_init(tdes_dd); |
|
if (err) |
|
goto err_tasklet_kill; |
|
|
|
atmel_tdes_get_cap(tdes_dd); |
|
|
|
err = atmel_tdes_buff_init(tdes_dd); |
|
if (err) |
|
goto err_tasklet_kill; |
|
|
|
if (tdes_dd->caps.has_dma) { |
|
err = atmel_tdes_dma_init(tdes_dd); |
|
if (err) |
|
goto err_buff_cleanup; |
|
|
|
dev_info(dev, "using %s, %s for DMA transfers\n", |
|
dma_chan_name(tdes_dd->dma_lch_in.chan), |
|
dma_chan_name(tdes_dd->dma_lch_out.chan)); |
|
} |
|
|
|
spin_lock(&atmel_tdes.lock); |
|
list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list); |
|
spin_unlock(&atmel_tdes.lock); |
|
|
|
err = atmel_tdes_register_algs(tdes_dd); |
|
if (err) |
|
goto err_algs; |
|
|
|
dev_info(dev, "Atmel DES/TDES\n"); |
|
|
|
return 0; |
|
|
|
err_algs: |
|
spin_lock(&atmel_tdes.lock); |
|
list_del(&tdes_dd->list); |
|
spin_unlock(&atmel_tdes.lock); |
|
if (tdes_dd->caps.has_dma) |
|
atmel_tdes_dma_cleanup(tdes_dd); |
|
err_buff_cleanup: |
|
atmel_tdes_buff_cleanup(tdes_dd); |
|
err_tasklet_kill: |
|
tasklet_kill(&tdes_dd->done_task); |
|
tasklet_kill(&tdes_dd->queue_task); |
|
|
|
return err; |
|
} |
|
|
|
static int atmel_tdes_remove(struct platform_device *pdev) |
|
{ |
|
struct atmel_tdes_dev *tdes_dd; |
|
|
|
tdes_dd = platform_get_drvdata(pdev); |
|
if (!tdes_dd) |
|
return -ENODEV; |
|
spin_lock(&atmel_tdes.lock); |
|
list_del(&tdes_dd->list); |
|
spin_unlock(&atmel_tdes.lock); |
|
|
|
atmel_tdes_unregister_algs(tdes_dd); |
|
|
|
tasklet_kill(&tdes_dd->done_task); |
|
tasklet_kill(&tdes_dd->queue_task); |
|
|
|
if (tdes_dd->caps.has_dma) |
|
atmel_tdes_dma_cleanup(tdes_dd); |
|
|
|
atmel_tdes_buff_cleanup(tdes_dd); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver atmel_tdes_driver = { |
|
.probe = atmel_tdes_probe, |
|
.remove = atmel_tdes_remove, |
|
.driver = { |
|
.name = "atmel_tdes", |
|
.of_match_table = of_match_ptr(atmel_tdes_dt_ids), |
|
}, |
|
}; |
|
|
|
module_platform_driver(atmel_tdes_driver); |
|
|
|
MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support."); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
|
|
|