--- /dev/null
+/*
+ * Cryptographic API.
+ *
+ * Support for ATMEL AES 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 driver.
+ */
+
+
+#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/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/hash.h>
+#include <crypto/internal/hash.h>
+#include <linux/platform_data/atmel-aes.h>
+#include "atmel-aes-regs.h"
+
+#define CFB8_BLOCK_SIZE 1
+#define CFB16_BLOCK_SIZE 2
+#define CFB32_BLOCK_SIZE 4
+#define CFB64_BLOCK_SIZE 8
+
+/* AES flags */
+#define AES_FLAGS_MODE_MASK 0x01ff
+#define AES_FLAGS_ENCRYPT BIT(0)
+#define AES_FLAGS_CBC BIT(1)
+#define AES_FLAGS_CFB BIT(2)
+#define AES_FLAGS_CFB8 BIT(3)
+#define AES_FLAGS_CFB16 BIT(4)
+#define AES_FLAGS_CFB32 BIT(5)
+#define AES_FLAGS_CFB64 BIT(6)
+#define AES_FLAGS_OFB BIT(7)
+#define AES_FLAGS_CTR BIT(8)
+
+#define AES_FLAGS_INIT BIT(16)
+#define AES_FLAGS_DMA BIT(17)
+#define AES_FLAGS_BUSY BIT(18)
+
+#define AES_FLAGS_DUALBUFF BIT(24)
+
+#define ATMEL_AES_QUEUE_LENGTH 1
+#define ATMEL_AES_CACHE_SIZE 0
+
+#define ATMEL_AES_DMA_THRESHOLD 16
+
+
+struct atmel_aes_dev;
+
+struct atmel_aes_ctx {
+ struct atmel_aes_dev *dd;
+
+ int keylen;
+ u32 key[AES_KEYSIZE_256 / sizeof(u32)];
+};
+
+struct atmel_aes_reqctx {
+ unsigned long mode;
+};
+
+struct atmel_aes_dma {
+ struct dma_chan *chan;
+ struct dma_slave_config dma_conf;
+};
+
+struct atmel_aes_dev {
+ struct list_head list;
+ unsigned long phys_base;
+ void __iomem *io_base;
+
+ struct atmel_aes_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;
+
+ struct scatterlist *out_sg;
+ unsigned int nb_out_sg;
+
+ size_t bufcnt;
+
+ u8 buf_in[ATMEL_AES_DMA_THRESHOLD] __aligned(sizeof(u32));
+ int dma_in;
+ struct atmel_aes_dma dma_lch_in;
+
+ u8 buf_out[ATMEL_AES_DMA_THRESHOLD] __aligned(sizeof(u32));
+ int dma_out;
+ struct atmel_aes_dma dma_lch_out;
+
+ u32 hw_version;
+};
+
+struct atmel_aes_drv {
+ struct list_head dev_list;
+ spinlock_t lock;
+};
+
+static struct atmel_aes_drv atmel_aes = {
+ .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
+ .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
+};
+
+static int atmel_aes_sg_length(struct ablkcipher_request *req,
+ struct scatterlist *sg)
+{
+ unsigned int total = req->nbytes;
+ int sg_nb;
+ unsigned int len;
+ struct scatterlist *sg_list;
+
+ sg_nb = 0;
+ sg_list = sg;
+ total = req->nbytes;
+
+ while (total) {
+ len = min(sg_list->length, total);
+
+ sg_nb++;
+ total -= len;
+
+ sg_list = sg_next(sg_list);
+ if (!sg_list)
+ total = 0;
+ }
+
+ return sg_nb;
+}
+
+static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
+{
+ return readl_relaxed(dd->io_base + offset);
+}
+
+static inline void atmel_aes_write(struct atmel_aes_dev *dd,
+ u32 offset, u32 value)
+{
+ writel_relaxed(value, dd->io_base + offset);
+}
+
+static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
+ u32 *value, int count)
+{
+ for (; count--; value++, offset += 4)
+ *value = atmel_aes_read(dd, offset);
+}
+
+static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
+ u32 *value, int count)
+{
+ for (; count--; value++, offset += 4)
+ atmel_aes_write(dd, offset, *value);
+}
+
+static void atmel_aes_dualbuff_test(struct atmel_aes_dev *dd)
+{
+ atmel_aes_write(dd, AES_MR, AES_MR_DUALBUFF);
+
+ if (atmel_aes_read(dd, AES_MR) & AES_MR_DUALBUFF)
+ dd->flags |= AES_FLAGS_DUALBUFF;
+}
+
+static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_ctx *ctx)
+{
+ struct atmel_aes_dev *aes_dd = NULL;
+ struct atmel_aes_dev *tmp;
+
+ spin_lock_bh(&atmel_aes.lock);
+ if (!ctx->dd) {
+ list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
+ aes_dd = tmp;
+ break;
+ }
+ ctx->dd = aes_dd;
+ } else {
+ aes_dd = ctx->dd;
+ }
+
+ spin_unlock_bh(&atmel_aes.lock);
+
+ return aes_dd;
+}
+
+static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
+{
+ clk_prepare_enable(dd->iclk);
+
+ if (!(dd->flags & AES_FLAGS_INIT)) {
+ atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
+ atmel_aes_dualbuff_test(dd);
+ dd->flags |= AES_FLAGS_INIT;
+ dd->err = 0;
+ }
+
+ return 0;
+}
+
+static void atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
+{
+ atmel_aes_hw_init(dd);
+
+ dd->hw_version = atmel_aes_read(dd, AES_HW_VERSION);
+
+ clk_disable_unprepare(dd->iclk);
+}
+
+static void atmel_aes_finish_req(struct atmel_aes_dev *dd, int err)
+{
+ struct ablkcipher_request *req = dd->req;
+
+ clk_disable_unprepare(dd->iclk);
+ dd->flags &= ~AES_FLAGS_BUSY;
+
+ req->base.complete(&req->base, err);
+}
+
+static void atmel_aes_dma_callback(void *data)
+{
+ struct atmel_aes_dev *dd = data;
+
+ /* dma_lch_out - completed */
+ tasklet_schedule(&dd->done_task);
+}
+
+static int atmel_aes_crypt_dma(struct atmel_aes_dev *dd)
+{
+ struct dma_async_tx_descriptor *in_desc, *out_desc;
+ int nb_dma_sg_in, nb_dma_sg_out;
+
+ dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
+ if (!dd->nb_in_sg)
+ goto exit_err;
+
+ nb_dma_sg_in = dma_map_sg(dd->dev, dd->in_sg, dd->nb_in_sg,
+ DMA_TO_DEVICE);
+ if (!nb_dma_sg_in)
+ goto exit_err;
+
+ in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, dd->in_sg,
+ nb_dma_sg_in, DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
+ if (!in_desc)
+ goto unmap_in;
+
+ /* callback not needed */
+
+ dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
+ if (!dd->nb_out_sg)
+ goto unmap_in;
+
+ nb_dma_sg_out = dma_map_sg(dd->dev, dd->out_sg, dd->nb_out_sg,
+ DMA_FROM_DEVICE);
+ if (!nb_dma_sg_out)
+ goto unmap_out;
+
+ out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, dd->out_sg,
+ nb_dma_sg_out, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
+ if (!out_desc)
+ goto unmap_out;
+
+ out_desc->callback = atmel_aes_dma_callback;
+ out_desc->callback_param = dd;
+
+ dd->total -= dd->req->nbytes;
+
+ 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;
+
+unmap_out:
+ dma_unmap_sg(dd->dev, dd->out_sg, dd->nb_out_sg,
+ DMA_FROM_DEVICE);
+unmap_in:
+ dma_unmap_sg(dd->dev, dd->in_sg, dd->nb_in_sg,
+ DMA_TO_DEVICE);
+exit_err:
+ return -EINVAL;
+}
+
+static int atmel_aes_crypt_cpu_start(struct atmel_aes_dev *dd)
+{
+ dd->flags &= ~AES_FLAGS_DMA;
+
+ /* use cache buffers */
+ dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
+ if (!dd->nb_in_sg)
+ return -EINVAL;
+
+ dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
+ if (!dd->nb_in_sg)
+ return -EINVAL;
+
+ dd->bufcnt = sg_copy_to_buffer(dd->in_sg, dd->nb_in_sg,
+ dd->buf_in, dd->total);
+
+ if (!dd->bufcnt)
+ return -EINVAL;
+
+ dd->total -= dd->bufcnt;
+
+ atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
+ atmel_aes_write_n(dd, AES_IDATAR(0), (u32 *) dd->buf_in,
+ dd->bufcnt >> 2);
+
+ return 0;
+}
+
+static int atmel_aes_crypt_dma_start(struct atmel_aes_dev *dd)
+{
+ int err;
+
+ if (dd->flags & AES_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 & AES_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 |= AES_FLAGS_DMA;
+ err = atmel_aes_crypt_dma(dd);
+
+ return err;
+}
+
+static int atmel_aes_write_ctrl(struct atmel_aes_dev *dd)
+{
+ int err;
+ u32 valcr = 0, valmr = 0;
+
+ err = atmel_aes_hw_init(dd);
+
+ if (err)
+ return err;
+
+ /* MR register must be set before IV registers */
+ if (dd->ctx->keylen == AES_KEYSIZE_128)
+ valmr |= AES_MR_KEYSIZE_128;
+ else if (dd->ctx->keylen == AES_KEYSIZE_192)
+ valmr |= AES_MR_KEYSIZE_192;
+ else
+ valmr |= AES_MR_KEYSIZE_256;
+
+ if (dd->flags & AES_FLAGS_CBC) {
+ valmr |= AES_MR_OPMOD_CBC;
+ } else if (dd->flags & AES_FLAGS_CFB) {
+ valmr |= AES_MR_OPMOD_CFB;
+ if (dd->flags & AES_FLAGS_CFB8)
+ valmr |= AES_MR_CFBS_8b;
+ else if (dd->flags & AES_FLAGS_CFB16)
+ valmr |= AES_MR_CFBS_16b;
+ else if (dd->flags & AES_FLAGS_CFB32)
+ valmr |= AES_MR_CFBS_32b;
+ else if (dd->flags & AES_FLAGS_CFB64)
+ valmr |= AES_MR_CFBS_64b;
+ } else if (dd->flags & AES_FLAGS_OFB) {
+ valmr |= AES_MR_OPMOD_OFB;
+ } else if (dd->flags & AES_FLAGS_CTR) {
+ valmr |= AES_MR_OPMOD_CTR;
+ } else {
+ valmr |= AES_MR_OPMOD_ECB;
+ }
+
+ if (dd->flags & AES_FLAGS_ENCRYPT)
+ valmr |= AES_MR_CYPHER_ENC;
+
+ if (dd->total > ATMEL_AES_DMA_THRESHOLD) {
+ valmr |= AES_MR_SMOD_IDATAR0;
+ if (dd->flags & AES_FLAGS_DUALBUFF)
+ valmr |= AES_MR_DUALBUFF;
+ } else {
+ valmr |= AES_MR_SMOD_AUTO;
+ }
+
+ atmel_aes_write(dd, AES_CR, valcr);
+ atmel_aes_write(dd, AES_MR, valmr);
+
+ atmel_aes_write_n(dd, AES_KEYWR(0), dd->ctx->key,
+ dd->ctx->keylen >> 2);
+
+ if (((dd->flags & AES_FLAGS_CBC) || (dd->flags & AES_FLAGS_CFB) ||
+ (dd->flags & AES_FLAGS_OFB) || (dd->flags & AES_FLAGS_CTR)) &&
+ dd->req->info) {
+ atmel_aes_write_n(dd, AES_IVR(0), dd->req->info, 4);
+ }
+
+ return 0;
+}
+
+static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
+ struct ablkcipher_request *req)
+{
+ struct crypto_async_request *async_req, *backlog;
+ struct atmel_aes_ctx *ctx;
+ struct atmel_aes_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 & AES_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 |= AES_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_sg = req->src;
+ dd->out_sg = req->dst;
+
+ rctx = ablkcipher_request_ctx(req);
+ ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
+ rctx->mode &= AES_FLAGS_MODE_MASK;
+ dd->flags = (dd->flags & ~AES_FLAGS_MODE_MASK) | rctx->mode;
+ dd->ctx = ctx;
+ ctx->dd = dd;
+
+ err = atmel_aes_write_ctrl(dd);
+ if (!err) {
+ if (dd->total > ATMEL_AES_DMA_THRESHOLD)
+ err = atmel_aes_crypt_dma_start(dd);
+ else
+ err = atmel_aes_crypt_cpu_start(dd);
+ }
+ if (err) {
+ /* aes_task will not finish it, so do it here */
+ atmel_aes_finish_req(dd, err);
+ tasklet_schedule(&dd->queue_task);
+ }
+
+ return ret;
+}
+
+static int atmel_aes_crypt_dma_stop(struct atmel_aes_dev *dd)
+{
+ int err = -EINVAL;
+
+ if (dd->flags & AES_FLAGS_DMA) {
+ dma_unmap_sg(dd->dev, dd->out_sg,
+ dd->nb_out_sg, DMA_FROM_DEVICE);
+ dma_unmap_sg(dd->dev, dd->in_sg,
+ dd->nb_in_sg, DMA_TO_DEVICE);
+ err = 0;
+ }
+
+ return err;
+}
+
+static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
+{
+ struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(
+ crypto_ablkcipher_reqtfm(req));
+ struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
+ struct atmel_aes_dev *dd;
+
+ if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
+ pr_err("request size is not exact amount of AES blocks\n");
+ return -EINVAL;
+ }
+
+ dd = atmel_aes_find_dev(ctx);
+ if (!dd)
+ return -ENODEV;
+
+ rctx->mode = mode;
+
+ return atmel_aes_handle_queue(dd, req);
+}
+
+static bool atmel_aes_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_aes_dma_init(struct atmel_aes_dev *dd)
+{
+ int err = -ENOMEM;
+ struct aes_platform_data *pdata;
+ dma_cap_mask_t mask_in, mask_out;
+
+ pdata = dd->dev->platform_data;
+
+ if (pdata && pdata->dma_slave->txdata.dma_dev &&
+ pdata->dma_slave->rxdata.dma_dev) {
+
+ /* Try to grab 2 DMA channels */
+ dma_cap_zero(mask_in);
+ dma_cap_set(DMA_SLAVE, mask_in);
+
+ dd->dma_lch_in.chan = dma_request_channel(mask_in,
+ atmel_aes_filter, &pdata->dma_slave->rxdata);
+ 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 +
+ AES_IDATAR(0);
+ dd->dma_lch_in.dma_conf.src_maxburst = 1;
+ dd->dma_lch_in.dma_conf.dst_maxburst = 1;
+ dd->dma_lch_in.dma_conf.device_fc = false;
+
+ dma_cap_zero(mask_out);
+ dma_cap_set(DMA_SLAVE, mask_out);
+ dd->dma_lch_out.chan = dma_request_channel(mask_out,
+ atmel_aes_filter, &pdata->dma_slave->txdata);
+ 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 +
+ AES_ODATAR(0);
+ dd->dma_lch_out.dma_conf.src_maxburst = 1;
+ dd->dma_lch_out.dma_conf.dst_maxburst = 1;
+ dd->dma_lch_out.dma_conf.device_fc = false;
+
+ return 0;
+ } else {
+ return -ENODEV;
+ }
+
+err_dma_out:
+ dma_release_channel(dd->dma_lch_in.chan);
+err_dma_in:
+ return err;
+}
+
+static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
+{
+ dma_release_channel(dd->dma_lch_in.chan);
+ dma_release_channel(dd->dma_lch_out.chan);
+}
+
+static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+
+ if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
+ keylen != AES_KEYSIZE_256) {
+ 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_aes_ecb_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ 0);
+}
+
+static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CBC);
+}
+
+static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CBC);
+}
+
+static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_OFB);
+}
+
+static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_OFB);
+}
+
+static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CFB);
+}
+
+static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CFB);
+}
+
+static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB64);
+}
+
+static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CFB | AES_FLAGS_CFB64);
+}
+
+static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB32);
+}
+
+static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CFB | AES_FLAGS_CFB32);
+}
+
+static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB16);
+}
+
+static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CFB | AES_FLAGS_CFB16);
+}
+
+static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB8);
+}
+
+static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CFB | AES_FLAGS_CFB8);
+}
+
+static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_ENCRYPT | AES_FLAGS_CTR);
+}
+
+static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
+{
+ return atmel_aes_crypt(req,
+ AES_FLAGS_CTR);
+}
+
+static int atmel_aes_cra_init(struct crypto_tfm *tfm)
+{
+ tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
+
+ return 0;
+}
+
+static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static struct crypto_alg aes_algs[] = {
+{
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "atmel-ecb-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_ecb_encrypt,
+ .decrypt = atmel_aes_ecb_decrypt,
+ }
+},
+{
+ .cra_name = "cbc(aes)",
+ .cra_driver_name = "atmel-cbc-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cbc_encrypt,
+ .decrypt = atmel_aes_cbc_decrypt,
+ }
+},
+{
+ .cra_name = "ofb(aes)",
+ .cra_driver_name = "atmel-ofb-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_ofb_encrypt,
+ .decrypt = atmel_aes_ofb_decrypt,
+ }
+},
+{
+ .cra_name = "cfb(aes)",
+ .cra_driver_name = "atmel-cfb-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cfb_encrypt,
+ .decrypt = atmel_aes_cfb_decrypt,
+ }
+},
+{
+ .cra_name = "cfb32(aes)",
+ .cra_driver_name = "atmel-cfb32-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CFB32_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cfb32_encrypt,
+ .decrypt = atmel_aes_cfb32_decrypt,
+ }
+},
+{
+ .cra_name = "cfb16(aes)",
+ .cra_driver_name = "atmel-cfb16-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CFB16_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cfb16_encrypt,
+ .decrypt = atmel_aes_cfb16_decrypt,
+ }
+},
+{
+ .cra_name = "cfb8(aes)",
+ .cra_driver_name = "atmel-cfb8-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CFB64_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cfb8_encrypt,
+ .decrypt = atmel_aes_cfb8_decrypt,
+ }
+},
+{
+ .cra_name = "ctr(aes)",
+ .cra_driver_name = "atmel-ctr-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_ctr_encrypt,
+ .decrypt = atmel_aes_ctr_decrypt,
+ }
+},
+};
+
+static struct crypto_alg aes_cfb64_alg[] = {
+{
+ .cra_name = "cfb64(aes)",
+ .cra_driver_name = "atmel-cfb64-aes",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = CFB64_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_aes_ctx),
+ .cra_alignmask = 0x0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_aes_cra_init,
+ .cra_exit = atmel_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = atmel_aes_setkey,
+ .encrypt = atmel_aes_cfb64_encrypt,
+ .decrypt = atmel_aes_cfb64_decrypt,
+ }
+},
+};
+
+static void atmel_aes_queue_task(unsigned long data)
+{
+ struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
+
+ atmel_aes_handle_queue(dd, NULL);
+}
+
+static void atmel_aes_done_task(unsigned long data)
+{
+ struct atmel_aes_dev *dd = (struct atmel_aes_dev *) data;
+ int err;
+
+ if (!(dd->flags & AES_FLAGS_DMA)) {
+ atmel_aes_read_n(dd, AES_ODATAR(0), (u32 *) dd->buf_out,
+ dd->bufcnt >> 2);
+
+ if (sg_copy_from_buffer(dd->out_sg, dd->nb_out_sg,
+ dd->buf_out, dd->bufcnt))
+ err = 0;
+ else
+ err = -EINVAL;
+
+ goto cpu_end;
+ }
+
+ err = atmel_aes_crypt_dma_stop(dd);
+
+ err = dd->err ? : err;
+
+ if (dd->total && !err) {
+ err = atmel_aes_crypt_dma_start(dd);
+ if (!err)
+ return; /* DMA started. Not fininishing. */
+ }
+
+cpu_end:
+ atmel_aes_finish_req(dd, err);
+ atmel_aes_handle_queue(dd, NULL);
+}
+
+static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
+{
+ struct atmel_aes_dev *aes_dd = dev_id;
+ u32 reg;
+
+ reg = atmel_aes_read(aes_dd, AES_ISR);
+ if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
+ atmel_aes_write(aes_dd, AES_IDR, reg);
+ if (AES_FLAGS_BUSY & aes_dd->flags)
+ tasklet_schedule(&aes_dd->done_task);
+ else
+ dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
+ crypto_unregister_alg(&aes_algs[i]);
+ if (dd->hw_version >= 0x130)
+ crypto_unregister_alg(&aes_cfb64_alg[0]);
+}
+
+static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
+{
+ int err, i, j;
+
+ for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
+ INIT_LIST_HEAD(&aes_algs[i].cra_list);
+ err = crypto_register_alg(&aes_algs[i]);
+ if (err)
+ goto err_aes_algs;
+ }
+
+ atmel_aes_hw_version_init(dd);
+
+ if (dd->hw_version >= 0x130) {
+ INIT_LIST_HEAD(&aes_cfb64_alg[0].cra_list);
+ err = crypto_register_alg(&aes_cfb64_alg[0]);
+ if (err)
+ goto err_aes_cfb64_alg;
+ }
+
+ return 0;
+
+err_aes_cfb64_alg:
+ i = ARRAY_SIZE(aes_algs);
+err_aes_algs:
+ for (j = 0; j < i; j++)
+ crypto_unregister_alg(&aes_algs[j]);
+
+ return err;
+}
+
+static int __devinit atmel_aes_probe(struct platform_device *pdev)
+{
+ struct atmel_aes_dev *aes_dd;
+ struct aes_platform_data *pdata;
+ struct device *dev = &pdev->dev;
+ struct resource *aes_res;
+ unsigned long aes_phys_size;
+ int err;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ err = -ENXIO;
+ goto aes_dd_err;
+ }
+
+ aes_dd = kzalloc(sizeof(struct atmel_aes_dev), GFP_KERNEL);
+ if (aes_dd == NULL) {
+ dev_err(dev, "unable to alloc data struct.\n");
+ err = -ENOMEM;
+ goto aes_dd_err;
+ }
+
+ aes_dd->dev = dev;
+
+ platform_set_drvdata(pdev, aes_dd);
+
+ INIT_LIST_HEAD(&aes_dd->list);
+
+ tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
+ (unsigned long)aes_dd);
+ tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
+ (unsigned long)aes_dd);
+
+ crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
+
+ aes_dd->irq = -1;
+
+ /* Get the base address */
+ aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!aes_res) {
+ dev_err(dev, "no MEM resource info\n");
+ err = -ENODEV;
+ goto res_err;
+ }
+ aes_dd->phys_base = aes_res->start;
+ aes_phys_size = resource_size(aes_res);
+
+ /* Get the IRQ */
+ aes_dd->irq = platform_get_irq(pdev, 0);
+ if (aes_dd->irq < 0) {
+ dev_err(dev, "no IRQ resource info\n");
+ err = aes_dd->irq;
+ goto aes_irq_err;
+ }
+
+ err = request_irq(aes_dd->irq, atmel_aes_irq, IRQF_SHARED, "atmel-aes",
+ aes_dd);
+ if (err) {
+ dev_err(dev, "unable to request aes irq.\n");
+ goto aes_irq_err;
+ }
+
+ /* Initializing the clock */
+ aes_dd->iclk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(aes_dd->iclk)) {
+ dev_err(dev, "clock intialization failed.\n");
+ err = PTR_ERR(aes_dd->iclk);
+ goto clk_err;
+ }
+
+ aes_dd->io_base = ioremap(aes_dd->phys_base, aes_phys_size);
+ if (!aes_dd->io_base) {
+ dev_err(dev, "can't ioremap\n");
+ err = -ENOMEM;
+ goto aes_io_err;
+ }
+
+ err = atmel_aes_dma_init(aes_dd);
+ if (err)
+ goto err_aes_dma;
+
+ spin_lock(&atmel_aes.lock);
+ list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
+ spin_unlock(&atmel_aes.lock);
+
+ err = atmel_aes_register_algs(aes_dd);
+ if (err)
+ goto err_algs;
+
+ dev_info(dev, "Atmel AES\n");
+
+ return 0;
+
+err_algs:
+ spin_lock(&atmel_aes.lock);
+ list_del(&aes_dd->list);
+ spin_unlock(&atmel_aes.lock);
+ atmel_aes_dma_cleanup(aes_dd);
+err_aes_dma:
+ iounmap(aes_dd->io_base);
+aes_io_err:
+ clk_put(aes_dd->iclk);
+clk_err:
+ free_irq(aes_dd->irq, aes_dd);
+aes_irq_err:
+res_err:
+ tasklet_kill(&aes_dd->done_task);
+ tasklet_kill(&aes_dd->queue_task);
+ kfree(aes_dd);
+ aes_dd = NULL;
+aes_dd_err:
+ dev_err(dev, "initialization failed.\n");
+
+ return err;
+}
+
+static int __devexit atmel_aes_remove(struct platform_device *pdev)
+{
+ static struct atmel_aes_dev *aes_dd;
+
+ aes_dd = platform_get_drvdata(pdev);
+ if (!aes_dd)
+ return -ENODEV;
+ spin_lock(&atmel_aes.lock);
+ list_del(&aes_dd->list);
+ spin_unlock(&atmel_aes.lock);
+
+ atmel_aes_unregister_algs(aes_dd);
+
+ tasklet_kill(&aes_dd->done_task);
+ tasklet_kill(&aes_dd->queue_task);
+
+ atmel_aes_dma_cleanup(aes_dd);
+
+ iounmap(aes_dd->io_base);
+
+ clk_put(aes_dd->iclk);
+
+ if (aes_dd->irq > 0)
+ free_irq(aes_dd->irq, aes_dd);
+
+ kfree(aes_dd);
+ aes_dd = NULL;
+
+ return 0;
+}
+
+static struct platform_driver atmel_aes_driver = {
+ .probe = atmel_aes_probe,
+ .remove = __devexit_p(atmel_aes_remove),
+ .driver = {
+ .name = "atmel_aes",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(atmel_aes_driver);
+
+MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
projects / profile / common / kernel-common.git / commitdiff