diff options
Diffstat (limited to 'drivers/crypto/atmel-tdes.c')
| -rw-r--r-- | drivers/crypto/atmel-tdes.c | 1542 |
1 files changed, 1542 insertions, 0 deletions
diff --git a/drivers/crypto/atmel-tdes.c b/drivers/crypto/atmel-tdes.c new file mode 100644 index 00000000000..6cde5b530c6 --- /dev/null +++ b/drivers/crypto/atmel-tdes.c @@ -0,0 +1,1542 @@ +/* + * Cryptographic API. + * + * Support for ATMEL DES/TDES 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-aes.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/des.h> +#include <crypto/hash.h> +#include <crypto/internal/hash.h> +#include <linux/platform_data/crypto-atmel.h> +#include "atmel-tdes-regs.h" + +/* TDES flags */ +#define TDES_FLAGS_MODE_MASK 0x00ff +#define TDES_FLAGS_ENCRYPT BIT(0) +#define TDES_FLAGS_CBC BIT(1) +#define TDES_FLAGS_CFB BIT(2) +#define TDES_FLAGS_CFB8 BIT(3) +#define TDES_FLAGS_CFB16 BIT(4) +#define TDES_FLAGS_CFB32 BIT(5) +#define TDES_FLAGS_CFB64 BIT(6) +#define TDES_FLAGS_OFB BIT(7) + +#define TDES_FLAGS_INIT BIT(16) +#define TDES_FLAGS_FAST BIT(17) +#define TDES_FLAGS_BUSY BIT(18) +#define TDES_FLAGS_DMA BIT(19) + +#define ATMEL_TDES_QUEUE_LENGTH 50 + +#define CFB8_BLOCK_SIZE 1 +#define CFB16_BLOCK_SIZE 2 +#define CFB32_BLOCK_SIZE 4 + +struct atmel_tdes_caps { + bool has_dma; + u32 has_cfb_3keys; +}; + +struct atmel_tdes_dev; + +struct atmel_tdes_ctx { + struct atmel_tdes_dev *dd; + + int keylen; + u32 key[3*DES_KEY_SIZE / sizeof(u32)]; + unsigned long flags; + + u16 block_size; +}; + +struct atmel_tdes_reqctx { + unsigned long mode; +}; + +struct atmel_tdes_dma { + struct dma_chan *chan; + struct dma_slave_config dma_conf; +}; + +struct atmel_tdes_dev { + struct list_head list; + unsigned long phys_base; + void __iomem *io_base; + + struct atmel_tdes_ctx *ctx; + struct device *dev; + struct clk *iclk; + int irq; + + unsigned long flags; + int err; + + spinlock_t lock; + struct crypto_queue queue; + + struct tasklet_struct done_task; + struct tasklet_struct queue_task; + + struct ablkcipher_request *req; + size_t total; + + struct scatterlist *in_sg; + unsigned int nb_in_sg; + size_t in_offset; + struct scatterlist *out_sg; + unsigned int nb_out_sg; + size_t out_offset; + + size_t buflen; + size_t dma_size; + + void *buf_in; + int dma_in; + dma_addr_t dma_addr_in; + struct atmel_tdes_dma dma_lch_in; + + void *buf_out; + int dma_out; + dma_addr_t dma_addr_out; + struct atmel_tdes_dma dma_lch_out; + + struct atmel_tdes_caps caps; + + u32 hw_version; +}; + +struct atmel_tdes_drv { + struct list_head dev_list; + spinlock_t lock; +}; + +static struct atmel_tdes_drv atmel_tdes = { + .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list), + .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock), +}; + +static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset, + void *buf, size_t buflen, size_t total, int out) +{ + unsigned int count, off = 0; + + while (buflen && total) { + count = min((*sg)->length - *offset, total); + count = min(count, buflen); + + if (!count) + return off; + + scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out); + + off += count; + buflen -= count; + *offset += count; + total -= count; + + if (*offset == (*sg)->length) { + *sg = sg_next(*sg); + if (*sg) + *offset = 0; + else + total = 0; + } + } + + return off; +} + +static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset) +{ + return readl_relaxed(dd->io_base + offset); +} + +static inline void atmel_tdes_write(struct atmel_tdes_dev *dd, + u32 offset, u32 value) +{ + writel_relaxed(value, dd->io_base + offset); +} + +static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset, + u32 *value, int count) +{ + for (; count--; value++, offset += 4) + atmel_tdes_write(dd, offset, *value); +} + +static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx) +{ + struct atmel_tdes_dev *tdes_dd = NULL; + struct atmel_tdes_dev *tmp; + + spin_lock_bh(&atmel_tdes.lock); + if (!ctx->dd) { + list_for_each_entry(tmp, &atmel_tdes.dev_list, list) { + tdes_dd = tmp; + break; + } + ctx->dd = tdes_dd; + } else { + tdes_dd = ctx->dd; + } + spin_unlock_bh(&atmel_tdes.lock); + + return tdes_dd; +} + +static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd) +{ + clk_prepare_enable(dd->iclk); + + if (!(dd->flags & TDES_FLAGS_INIT)) { + atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST); + dd->flags |= TDES_FLAGS_INIT; + dd->err = 0; + } + + return 0; +} + +static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd) +{ + return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff; +} + +static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd) +{ + atmel_tdes_hw_init(dd); + + dd->hw_version = atmel_tdes_get_version(dd); + + dev_info(dd->dev, + "version: 0x%x\n", dd->hw_version); + + clk_disable_unprepare(dd->iclk); +} + +static void atmel_tdes_dma_callback(void *data) +{ + struct atmel_tdes_dev *dd = data; + + /* dma_lch_out - completed */ + tasklet_schedule(&dd->done_task); +} + +static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd) +{ + int err; + u32 valcr = 0, valmr = TDES_MR_SMOD_PDC; + + err = atmel_tdes_hw_init(dd); + + if (err) + return err; + + if (!dd->caps.has_dma) + atmel_tdes_write(dd, TDES_PTCR, + TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS); + + /* MR register must be set before IV registers */ + if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) { + valmr |= TDES_MR_KEYMOD_3KEY; + valmr |= TDES_MR_TDESMOD_TDES; + } else if (dd->ctx->keylen > DES_KEY_SIZE) { + valmr |= TDES_MR_KEYMOD_2KEY; + valmr |= TDES_MR_TDESMOD_TDES; + } else { + valmr |= TDES_MR_TDESMOD_DES; + } + + if (dd->flags & TDES_FLAGS_CBC) { + valmr |= TDES_MR_OPMOD_CBC; + } else if (dd->flags & TDES_FLAGS_CFB) { + valmr |= TDES_MR_OPMOD_CFB; + + if (dd->flags & TDES_FLAGS_CFB8) + valmr |= TDES_MR_CFBS_8b; + else if (dd->flags & TDES_FLAGS_CFB16) + valmr |= TDES_MR_CFBS_16b; + else if (dd->flags & TDES_FLAGS_CFB32) + valmr |= TDES_MR_CFBS_32b; + else if (dd->flags & TDES_FLAGS_CFB64) + valmr |= TDES_MR_CFBS_64b; + } else if (dd->flags & TDES_FLAGS_OFB) { + valmr |= TDES_MR_OPMOD_OFB; + } + + if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB)) + valmr |= TDES_MR_CYPHER_ENC; + + atmel_tdes_write(dd, TDES_CR, valcr); + atmel_tdes_write(dd, TDES_MR, valmr); + + atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key, + dd->ctx->keylen >> 2); + + if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) || + (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) { + atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2); + } + + return 0; +} + +static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd) +{ + int err = 0; + size_t count; + + atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); + + 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: %u\n", count); + } + } + + return err; +} + +static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd) +{ + int err = -ENOMEM; + + dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0); + dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0); + dd->buflen = PAGE_SIZE; + dd->buflen &= ~(DES_BLOCK_SIZE - 1); + + if (!dd->buf_in || !dd->buf_out) { + dev_err(dd->dev, "unable to alloc pages.\n"); + goto err_alloc; + } + + /* MAP here */ + dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, + dd->buflen, DMA_TO_DEVICE); + if (dma_mapping_error(dd->dev, dd->dma_addr_in)) { + dev_err(dd->dev, "dma %d bytes error\n", dd->buflen); + err = -EINVAL; + goto err_map_in; + } + + dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, + dd->buflen, DMA_FROM_DEVICE); + if (dma_mapping_error(dd->dev, dd->dma_addr_out)) { + dev_err(dd->dev, "dma %d bytes error\n", dd->buflen); + err = -EINVAL; + goto err_map_out; + } + + return 0; + +err_map_out: + dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, + DMA_TO_DEVICE); +err_map_in: + free_page((unsigned long)dd->buf_out); + free_page((unsigned long)dd->buf_in); +err_alloc: + if (err) + pr_err("error: %d\n", err); + return err; +} + +static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd) +{ + dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen, + DMA_FROM_DEVICE); + dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, + DMA_TO_DEVICE); + free_page((unsigned long)dd->buf_out); + free_page((unsigned long)dd->buf_in); +} + +static int atmel_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in, + dma_addr_t dma_addr_out, int length) +{ + struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm); + struct atmel_tdes_dev *dd = ctx->dd; + int len32; + + dd->dma_size = length; + + if (!(dd->flags & TDES_FLAGS_FAST)) { + dma_sync_single_for_device(dd->dev, dma_addr_in, length, + DMA_TO_DEVICE); + } + + if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8)) + len32 = DIV_ROUND_UP(length, sizeof(u8)); + else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16)) + len32 = DIV_ROUND_UP(length, sizeof(u16)); + else + len32 = DIV_ROUND_UP(length, sizeof(u32)); + + atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); + atmel_tdes_write(dd, TDES_TPR, dma_addr_in); + atmel_tdes_write(dd, TDES_TCR, len32); + atmel_tdes_write(dd, TDES_RPR, dma_addr_out); + atmel_tdes_write(dd, TDES_RCR, len32); + + /* Enable Interrupt */ + atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX); + + /* Start DMA transfer */ + atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN); + + return 0; +} + +static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in, + dma_addr_t dma_addr_out, int length) +{ + struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm); + struct atmel_tdes_dev *dd = ctx->dd; + struct scatterlist sg[2]; + struct dma_async_tx_descriptor *in_desc, *out_desc; + + dd->dma_size = length; + + if (!(dd->flags & TDES_FLAGS_FAST)) { + dma_sync_single_for_device(dd->dev, dma_addr_in, length, + DMA_TO_DEVICE); + } + + if (dd->flags & TDES_FLAGS_CFB8) { + dd->dma_lch_in.dma_conf.dst_addr_width = + DMA_SLAVE_BUSWIDTH_1_BYTE; + dd->dma_lch_out.dma_conf.src_addr_width = + DMA_SLAVE_BUSWIDTH_1_BYTE; + } else if (dd->flags & TDES_FLAGS_CFB16) { + dd->dma_lch_in.dma_conf.dst_addr_width = + DMA_SLAVE_BUSWIDTH_2_BYTES; + dd->dma_lch_out.dma_conf.src_addr_width = + DMA_SLAVE_BUSWIDTH_2_BYTES; + } else { + dd->dma_lch_in.dma_conf.dst_addr_width = + DMA_SLAVE_BUSWIDTH_4_BYTES; + dd->dma_lch_out.dma_conf.src_addr_width = + DMA_SLAVE_BUSWIDTH_4_BYTES; + } + + dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf); + dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf); + + dd->flags |= TDES_FLAGS_DMA; + + sg_init_table(&sg[0], 1); + sg_dma_address(&sg[0]) = dma_addr_in; + sg_dma_len(&sg[0]) = length; + + sg_init_table(&sg[1], 1); + sg_dma_address(&sg[1]) = dma_addr_out; + sg_dma_len(&sg[1]) = length; + + in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0], + 1, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!in_desc) + return -EINVAL; + + out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1], + 1, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!out_desc) + return -EINVAL; + + out_desc->callback = atmel_tdes_dma_callback; + out_desc->callback_param = dd; + + dmaengine_submit(out_desc); + dma_async_issue_pending(dd->dma_lch_out.chan); + + dmaengine_submit(in_desc); + dma_async_issue_pending(dd->dma_lch_in.chan); + + return 0; +} + +static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd) +{ + struct crypto_tfm *tfm = crypto_ablkcipher_tfm( + crypto_ablkcipher_reqtfm(dd->req)); + int err, fast = 0, in, out; + size_t count; + dma_addr_t addr_in, addr_out; + + if ((!dd->in_offset) && (!dd->out_offset)) { + /* check for alignment */ + in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) && + IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size); + out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) && + IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size); + fast = in && out; + + if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg)) + fast = 0; + } + + + if (fast) { + count = min(dd->total, sg_dma_len(dd->in_sg)); + count = min(count, sg_dma_len(dd->out_sg)); + + err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); + if (!err) { + dev_err(dd->dev, "dma_map_sg() error\n"); + return -EINVAL; + } + + err = dma_map_sg(dd->dev, dd->out_sg, 1, + DMA_FROM_DEVICE); + if (!err) { + dev_err(dd->dev, "dma_map_sg() error\n"); + dma_unmap_sg(dd->dev, dd->in_sg, 1, + DMA_TO_DEVICE); + return -EINVAL; + } + + addr_in = sg_dma_address(dd->in_sg); + addr_out = sg_dma_address(dd->out_sg); + + dd->flags |= TDES_FLAGS_FAST; + + } else { + /* use cache buffers */ + count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset, + dd->buf_in, dd->buflen, dd->total, 0); + + addr_in = dd->dma_addr_in; + addr_out = dd->dma_addr_out; + + dd->flags &= ~TDES_FLAGS_FAST; + } + + dd->total -= count; + + if (dd->caps.has_dma) + err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count); + else + err = atmel_tdes_crypt_pdc(tfm, 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_finish_req(struct atmel_tdes_dev *dd, int err) +{ + struct ablkcipher_request *req = dd->req; + + clk_disable_unprepare(dd->iclk); + + dd->flags &= ~TDES_FLAGS_BUSY; + + req->base.complete(&req->base, err); +} + +static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd, + struct ablkcipher_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 = ablkcipher_enqueue_request(&dd->queue, req); + 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 = ablkcipher_request_cast(async_req); + + /* assign new request to device */ + dd->req = req; + dd->total = req->nbytes; + dd->in_offset = 0; + dd->in_sg = req->src; + dd->out_offset = 0; + dd->out_sg = req->dst; + + rctx = ablkcipher_request_ctx(req); + ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_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: %u\n", count); + } + } + } + return err; +} + +static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode) +{ + struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx( + crypto_ablkcipher_reqtfm(req)); + struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req); + + if (mode & TDES_FLAGS_CFB8) { + if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) { + pr_err("request size is not exact amount of CFB8 blocks\n"); + return -EINVAL; + } + ctx->block_size = CFB8_BLOCK_SIZE; + } else if (mode & TDES_FLAGS_CFB16) { + if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) { + pr_err("request size is not exact amount of CFB16 blocks\n"); + return -EINVAL; + } + ctx->block_size = CFB16_BLOCK_SIZE; + } else if (mode & TDES_FLAGS_CFB32) { + if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) { + pr_err("request size is not exact amount of CFB32 blocks\n"); + return -EINVAL; + } + ctx->block_size = CFB32_BLOCK_SIZE; + } else { + if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) { + pr_err("request size is not exact amount of DES blocks\n"); + return -EINVAL; + } + ctx->block_size = DES_BLOCK_SIZE; + } + + rctx->mode = mode; + + return atmel_tdes_handle_queue(ctx->dd, req); +} + +static bool atmel_tdes_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_tdes_dma_init(struct atmel_tdes_dev *dd, + struct crypto_platform_data *pdata) +{ + int err = -ENOMEM; + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + /* Try to grab 2 DMA channels */ + dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask, + atmel_tdes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx"); + if (!dd->dma_lch_in.chan) + goto err_dma_in; + + dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV; + 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_slave_channel_compat(mask, + atmel_tdes_filter, &pdata->dma_slave->txdata, dd->dev, "rx"); + if (!dd->dma_lch_out.chan) + goto err_dma_out; + + dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM; + 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_warn(dd->dev, "no DMA channel available\n"); + return err; +} + +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_ablkcipher *tfm, const u8 *key, + unsigned int keylen) +{ + u32 tmp[DES_EXPKEY_WORDS]; + int err; + struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm); + + struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm); + + if (keylen != DES_KEY_SIZE) { + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + err = des_ekey(tmp, key); + if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) { + ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY; + return -EINVAL; + } + + memcpy(ctx->key, key, keylen); + ctx->keylen = keylen; + + return 0; +} + +static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm); + const char *alg_name; + + alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm)); + + /* + * HW bug in cfb 3-keys mode. + */ + if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb") + && (keylen != 2*DES_KEY_SIZE)) { + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) { + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + memcpy(ctx->key, key, keylen); + ctx->keylen = keylen; + + return 0; +} + +static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT); +} + +static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, 0); +} + +static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC); +} + +static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_CBC); +} +static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB); +} + +static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_CFB); +} + +static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | + TDES_FLAGS_CFB8); +} + +static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8); +} + +static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | + TDES_FLAGS_CFB16); +} + +static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16); +} + +static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | + TDES_FLAGS_CFB32); +} + +static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32); +} + +static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB); +} + +static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req) +{ + return atmel_tdes_crypt(req, TDES_FLAGS_OFB); +} + +static int atmel_tdes_cra_init(struct crypto_tfm *tfm) +{ + struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm); + struct atmel_tdes_dev *dd; + + tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx); + + dd = atmel_tdes_find_dev(ctx); + if (!dd) + return -ENODEV; + + return 0; +} + +static void atmel_tdes_cra_exit(struct crypto_tfm *tfm) +{ +} + +static struct crypto_alg tdes_algs[] = { +{ + .cra_name = "ecb(des)", + .cra_driver_name = "atmel-ecb-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .setkey = atmel_des_setkey, + .encrypt = atmel_tdes_ecb_encrypt, + .decrypt = atmel_tdes_ecb_decrypt, + } +}, +{ + .cra_name = "cbc(des)", + .cra_driver_name = "atmel-cbc-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "cfb(des)", + .cra_driver_name = "atmel-cfb-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "cfb8(des)", + .cra_driver_name = "atmel-cfb8-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB8_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "cfb16(des)", + .cra_driver_name = "atmel-cfb16-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB16_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x1, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "cfb32(des)", + .cra_driver_name = "atmel-cfb32-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB32_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x3, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "ofb(des)", + .cra_driver_name = "atmel-ofb-des", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .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, + } +}, +{ + .cra_name = "ecb(des3_ede)", + .cra_driver_name = "atmel-ecb-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2 * DES_KEY_SIZE, + .max_keysize = 3 * DES_KEY_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_ecb_encrypt, + .decrypt = atmel_tdes_ecb_decrypt, + } +}, +{ + .cra_name = "cbc(des3_ede)", + .cra_driver_name = "atmel-cbc-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 3*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_cbc_encrypt, + .decrypt = atmel_tdes_cbc_decrypt, + } +}, +{ + .cra_name = "cfb(des3_ede)", + .cra_driver_name = "atmel-cfb-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 2*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_cfb_encrypt, + .decrypt = atmel_tdes_cfb_decrypt, + } +}, +{ + .cra_name = "cfb8(des3_ede)", + .cra_driver_name = "atmel-cfb8-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB8_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 2*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_cfb8_encrypt, + .decrypt = atmel_tdes_cfb8_decrypt, + } +}, +{ + .cra_name = "cfb16(des3_ede)", + .cra_driver_name = "atmel-cfb16-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB16_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x1, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 2*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_cfb16_encrypt, + .decrypt = atmel_tdes_cfb16_decrypt, + } +}, +{ + .cra_name = "cfb32(des3_ede)", + .cra_driver_name = "atmel-cfb32-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = CFB32_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x3, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 2*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_cfb32_encrypt, + .decrypt = atmel_tdes_cfb32_decrypt, + } +}, +{ + .cra_name = "ofb(des3_ede)", + .cra_driver_name = "atmel-ofb-tdes", + .cra_priority = 100, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct atmel_tdes_ctx), + .cra_alignmask = 0x7, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = atmel_tdes_cra_init, + .cra_exit = atmel_tdes_cra_exit, + .cra_u.ablkcipher = { + .min_keysize = 2*DES_KEY_SIZE, + .max_keysize = 3*DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = atmel_tdes_setkey, + .encrypt = atmel_tdes_ofb_encrypt, + .decrypt = atmel_tdes_ofb_decrypt, + } +}, +}; + +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); + + err = dd->err ? : err; + + 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_alg(&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++) { + err = crypto_register_alg(&tdes_algs[i]); + if (err) + goto err_tdes_algs; + } + + return 0; + +err_tdes_algs: + for (j = 0; j < i; j++) + crypto_unregister_alg(&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); + +static struct crypto_platform_data *atmel_tdes_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"); + devm_kfree(&pdev->dev, pdata); + return ERR_PTR(-ENOMEM); + } + + return pdata; +} +#else /* CONFIG_OF */ +static inline struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev) +{ + return ERR_PTR(-EINVAL); +} +#endif + +static int atmel_tdes_probe(struct platform_device *pdev) +{ + struct atmel_tdes_dev *tdes_dd; + struct crypto_platform_data *pdata; + struct device *dev = &pdev->dev; + struct resource *tdes_res; + unsigned long tdes_phys_size; + int err; + + tdes_dd = kzalloc(sizeof(struct atmel_tdes_dev), GFP_KERNEL); + if (tdes_dd == NULL) { + dev_err(dev, "unable to alloc data struct.\n"); + err = -ENOMEM; + goto tdes_dd_err; + } + + tdes_dd->dev = dev; + + platform_set_drvdata(pdev, tdes_dd); + + INIT_LIST_HEAD(&tdes_dd->list); + + 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); + + tdes_dd->irq = -1; + + /* 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 res_err; + } + tdes_dd->phys_base = tdes_res->start; + tdes_phys_size = resource_size(tdes_res); + + /* Get the IRQ */ + tdes_dd->irq = platform_get_irq(pdev, 0); + if (tdes_dd->irq < 0) { + dev_err(dev, "no IRQ resource info\n"); + err = tdes_dd->irq; + goto res_err; + } + + err = request_irq(tdes_dd->irq, atmel_tdes_irq, IRQF_SHARED, + "atmel-tdes", tdes_dd); + if (err) { + dev_err(dev, "unable to request tdes irq.\n"); + goto tdes_irq_err; + } + + /* Initializing the clock */ + tdes_dd->iclk = clk_get(&pdev->dev, "tdes_clk"); + if (IS_ERR(tdes_dd->iclk)) { + dev_err(dev, "clock intialization failed.\n"); + err = PTR_ERR(tdes_dd->iclk); + goto clk_err; + } + + tdes_dd->io_base = ioremap(tdes_dd->phys_base, tdes_phys_size); + if (!tdes_dd->io_base) { + dev_err(dev, "can't ioremap\n"); + err = -ENOMEM; + goto tdes_io_err; + } + + atmel_tdes_hw_version_init(tdes_dd); + + atmel_tdes_get_cap(tdes_dd); + + err = atmel_tdes_buff_init(tdes_dd); + if (err) + goto err_tdes_buff; + + if (tdes_dd->caps.has_dma) { + pdata = pdev->dev.platform_data; + if (!pdata) { + pdata = atmel_tdes_of_init(pdev); + if (IS_ERR(pdata)) { + dev_err(&pdev->dev, "platform data not available\n"); + err = PTR_ERR(pdata); + goto err_pdata; + } + } + if (!pdata->dma_slave) { + err = -ENXIO; + goto err_pdata; + } + err = atmel_tdes_dma_init(tdes_dd, pdata); + if (err) + goto err_tdes_dma; + + 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_tdes_dma: +err_pdata: + atmel_tdes_buff_cleanup(tdes_dd); +err_tdes_buff: + iounmap(tdes_dd->io_base); +tdes_io_err: + clk_put(tdes_dd->iclk); +clk_err: + free_irq(tdes_dd->irq, tdes_dd); +tdes_irq_err: +res_err: + tasklet_kill(&tdes_dd->done_task); + tasklet_kill(&tdes_dd->queue_task); + kfree(tdes_dd); + tdes_dd = NULL; +tdes_dd_err: + dev_err(dev, "initialization failed.\n"); + + return err; +} + +static int atmel_tdes_remove(struct platform_device *pdev) +{ + static 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); + + iounmap(tdes_dd->io_base); + + clk_put(tdes_dd->iclk); + + if (tdes_dd->irq >= 0) + free_irq(tdes_dd->irq, tdes_dd); + + kfree(tdes_dd); + tdes_dd = NULL; + + return 0; +} + +static struct platform_driver atmel_tdes_driver = { + .probe = atmel_tdes_probe, + .remove = atmel_tdes_remove, + .driver = { + .name = "atmel_tdes", + .owner = THIS_MODULE, + .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"); |