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-rw-r--r--drivers/crypto/atmel-tdes.c1283
1 files changed, 1283 insertions, 0 deletions
diff --git a/drivers/crypto/atmel-tdes.c b/drivers/crypto/atmel-tdes.c
new file mode 100644
index 0000000000..099b32a10d
--- /dev/null
+++ b/drivers/crypto/atmel-tdes.c
@@ -0,0 +1,1283 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cryptographic API.
+ *
+ * Support for ATMEL DES/TDES HW acceleration.
+ *
+ * Copyright (c) 2012 Eukréa Electromatique - ATMEL
+ * Author: Nicolas Royer <nicolas@eukrea.com>
+ *
+ * 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/dmaengine.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/mod_devicetable.h>
+#include <linux/delay.h>
+#include <linux/crypto.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/algapi.h>
+#include <crypto/internal/des.h>
+#include <crypto/internal/skcipher.h>
+#include "atmel-tdes-regs.h"
+
+#define ATMEL_TDES_PRIORITY 300
+
+/* TDES flags */
+/* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */
+#define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC
+#define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK)
+#define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB
+#define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC
+#define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB
+#define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b)
+#define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b)
+#define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b)
+#define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b)
+
+#define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT)
+
+#define TDES_FLAGS_INIT BIT(3)
+#define TDES_FLAGS_FAST BIT(4)
+#define TDES_FLAGS_BUSY BIT(5)
+#define TDES_FLAGS_DMA BIT(6)
+
+#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[DES3_EDE_KEY_SIZE / sizeof(u32)];
+ unsigned long flags;
+
+ u16 block_size;
+};
+
+struct atmel_tdes_reqctx {
+ unsigned long mode;
+ u8 lastc[DES_BLOCK_SIZE];
+};
+
+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;
+
+ spinlock_t lock;
+ struct crypto_queue queue;
+
+ struct tasklet_struct done_task;
+ struct tasklet_struct queue_task;
+
+ struct skcipher_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)
+{
+ size_t 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,
+ const u32 *value, int count)
+{
+ for (; count--; value++, offset += 4)
+ atmel_tdes_write(dd, offset, *value);
+}
+
+static struct atmel_tdes_dev *atmel_tdes_dev_alloc(void)
+{
+ struct atmel_tdes_dev *tdes_dd;
+
+ spin_lock_bh(&atmel_tdes.lock);
+ /* One TDES IP per SoC. */
+ tdes_dd = list_first_entry_or_null(&atmel_tdes.dev_list,
+ struct atmel_tdes_dev, list);
+ spin_unlock_bh(&atmel_tdes.lock);
+ return tdes_dd;
+}
+
+static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
+{
+ int err;
+
+ err = clk_prepare_enable(dd->iclk);
+ if (err)
+ return err;
+
+ if (!(dd->flags & TDES_FLAGS_INIT)) {
+ atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
+ dd->flags |= TDES_FLAGS_INIT;
+ }
+
+ 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 int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
+{
+ int err;
+
+ err = atmel_tdes_hw_init(dd);
+ if (err)
+ return err;
+
+ dd->hw_version = atmel_tdes_get_version(dd);
+
+ dev_info(dd->dev,
+ "version: 0x%x\n", dd->hw_version);
+
+ clk_disable_unprepare(dd->iclk);
+
+ return 0;
+}
+
+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 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;
+ }
+
+ valmr |= dd->flags & TDES_FLAGS_MODE_MASK;
+
+ atmel_tdes_write(dd, TDES_MR, valmr);
+
+ atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
+ dd->ctx->keylen >> 2);
+
+ if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB)
+ atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 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;
+ dev_dbg(dd->dev, "not all data converted: %zu\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_dbg(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);
+ err = dma_mapping_error(dd->dev, dd->dma_addr_in);
+ if (err) {
+ dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
+ goto err_map_in;
+ }
+
+ dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
+ dd->buflen, DMA_FROM_DEVICE);
+ err = dma_mapping_error(dd->dev, dd->dma_addr_out);
+ if (err) {
+ dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
+ 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:
+err_alloc:
+ free_page((unsigned long)dd->buf_out);
+ free_page((unsigned long)dd->buf_in);
+ 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 atmel_tdes_dev *dd,
+ dma_addr_t dma_addr_in,
+ dma_addr_t dma_addr_out, int length)
+{
+ struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
+ 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);
+ }
+
+ switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
+ case TDES_FLAGS_CFB8:
+ len32 = DIV_ROUND_UP(length, sizeof(u8));
+ break;
+
+ case TDES_FLAGS_CFB16:
+ len32 = DIV_ROUND_UP(length, sizeof(u16));
+ break;
+
+ default:
+ len32 = DIV_ROUND_UP(length, sizeof(u32));
+ break;
+ }
+
+ 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 atmel_tdes_dev *dd,
+ dma_addr_t dma_addr_in,
+ dma_addr_t dma_addr_out, int length)
+{
+ struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
+ struct scatterlist sg[2];
+ struct dma_async_tx_descriptor *in_desc, *out_desc;
+ enum dma_slave_buswidth addr_width;
+
+ dd->dma_size = length;
+
+ if (!(dd->flags & TDES_FLAGS_FAST)) {
+ dma_sync_single_for_device(dd->dev, dma_addr_in, length,
+ DMA_TO_DEVICE);
+ }
+
+ switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
+ case TDES_FLAGS_CFB8:
+ addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ break;
+
+ case TDES_FLAGS_CFB16:
+ addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+
+ default:
+ addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ }
+
+ dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
+ dd->dma_lch_out.dma_conf.src_addr_width = addr_width;
+
+ 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)
+{
+ 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_t(size_t, dd->total, sg_dma_len(dd->in_sg));
+ count = min_t(size_t, count, sg_dma_len(dd->out_sg));
+
+ err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
+ if (!err) {
+ dev_dbg(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_dbg(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(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
+ memcpy(req->iv, rctx->lastc, ivsize);
+
+}
+
+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);
+
+ skcipher_request_complete(req, 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)
+ crypto_request_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;
+
+ 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;
+ dev_dbg(dd->dev, "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);
+ struct device *dev = ctx->dd->dev;
+
+ if (!req->cryptlen)
+ return 0;
+
+ switch (mode & TDES_FLAGS_OPMODE_MASK) {
+ case TDES_FLAGS_CFB8:
+ if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {
+ dev_dbg(dev, "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)) {
+ dev_dbg(dev, "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)) {
+ dev_dbg(dev, "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)) {
+ dev_dbg(dev, "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)) {
+ 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);
+
+ ctx->dd = atmel_tdes_dev_alloc();
+ if (!ctx->dd)
+ return -ENODEV;
+
+ crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
+
+ 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 = 1,
+ .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 0x800:
+ 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;
+ }
+}
+
+static const struct of_device_id atmel_tdes_dt_ids[] = {
+ { .compatible = "atmel,at91sam9g46-tdes" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
+
+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);
+
+ tdes_dd->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &tdes_res);
+ if (IS_ERR(tdes_dd->io_base)) {
+ err = PTR_ERR(tdes_dd->io_base);
+ 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;
+ }
+
+ 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 = platform_get_drvdata(pdev);
+
+ 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 = 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");