[PATCH v2 1/2] crypto: omap-des: Add omap-des driver for OMAP4/AM43xx
Joel Fernandes
joelf at ti.com
Fri Feb 14 11:49:10 EST 2014
Add omap-des driver with platform data for OMAP4/AM43xx. Support added for DES
ECB and CBC modes. Also add support for 3DES operation where 3 64-bit keys are
used to perform a DES encrypt-decrypt-encrypt (des3_ede) operation on a buffer.
Tests have been conducted with the CRYPTO test manager, and functionality is
verified at different page length alignments.
Signed-off-by: Joel Fernandes <joelf at ti.com>
---
v2 changes:
Address review comments from Rajendra at: https://lkml.org/lkml/2013/8/30/116
drivers/crypto/omap-des.c | 1218 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1218 insertions(+)
create mode 100644 drivers/crypto/omap-des.c
diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
new file mode 100644
index 0000000..006d914
--- /dev/null
+++ b/drivers/crypto/omap-des.c
@@ -0,0 +1,1218 @@
+/*
+ * Support for OMAP DES and Triple DES HW acceleration.
+ *
+ * Copyright (c) 2013 Texas Instruments Incorporated
+ * Author: Joel Fernandes <joelf at ti.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.
+ *
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#ifdef DEBUG
+#define prn(num) printk(#num "=%d\n", num)
+#define prx(num) printk(#num "=%x\n", num)
+#else
+#define prn(num) do { } while (0)
+#define prx(num) do { } while (0)
+#endif
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/omap-dma.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/crypto.h>
+#include <linux/interrupt.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/des.h>
+
+#define DST_MAXBURST 2
+
+#define DES_BLOCK_WORDS (DES_BLOCK_SIZE >> 2)
+
+#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
+
+#define DES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
+ ((x ^ 0x01) * 0x04))
+
+#define DES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
+
+#define DES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
+#define DES_REG_CTRL_CBC BIT(4)
+#define DES_REG_CTRL_TDES BIT(3)
+#define DES_REG_CTRL_DIRECTION BIT(2)
+#define DES_REG_CTRL_INPUT_READY BIT(1)
+#define DES_REG_CTRL_OUTPUT_READY BIT(0)
+
+#define DES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
+
+#define DES_REG_REV(dd) ((dd)->pdata->rev_ofs)
+
+#define DES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
+
+#define DES_REG_LENGTH_N(x) (0x24 + ((x) * 0x04))
+
+#define DES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
+#define DES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
+#define DES_REG_IRQ_DATA_IN BIT(1)
+#define DES_REG_IRQ_DATA_OUT BIT(2)
+
+#define FLAGS_MODE_MASK 0x000f
+#define FLAGS_ENCRYPT BIT(0)
+#define FLAGS_CBC BIT(1)
+#define FLAGS_INIT BIT(4)
+#define FLAGS_BUSY BIT(6)
+
+struct omap_des_ctx {
+ struct omap_des_dev *dd;
+
+ int keylen;
+ u32 key[(3 * DES_KEY_SIZE) / sizeof(u32)];
+ unsigned long flags;
+};
+
+struct omap_des_reqctx {
+ unsigned long mode;
+};
+
+#define OMAP_DES_QUEUE_LENGTH 1
+#define OMAP_DES_CACHE_SIZE 0
+
+struct omap_des_algs_info {
+ struct crypto_alg *algs_list;
+ unsigned int size;
+ unsigned int registered;
+};
+
+struct omap_des_pdata {
+ struct omap_des_algs_info *algs_info;
+ unsigned int algs_info_size;
+
+ void (*trigger)(struct omap_des_dev *dd, int length);
+
+ u32 key_ofs;
+ u32 iv_ofs;
+ u32 ctrl_ofs;
+ u32 data_ofs;
+ u32 rev_ofs;
+ u32 mask_ofs;
+ u32 irq_enable_ofs;
+ u32 irq_status_ofs;
+
+ u32 dma_enable_in;
+ u32 dma_enable_out;
+ u32 dma_start;
+
+ u32 major_mask;
+ u32 major_shift;
+ u32 minor_mask;
+ u32 minor_shift;
+};
+
+struct omap_des_dev {
+ struct list_head list;
+ unsigned long phys_base;
+ void __iomem *io_base;
+ struct omap_des_ctx *ctx;
+ struct device *dev;
+ unsigned long flags;
+ int err;
+
+ /* spinlock used for queues */
+ spinlock_t lock;
+ struct crypto_queue queue;
+
+ struct tasklet_struct done_task;
+ struct tasklet_struct queue_task;
+
+ struct ablkcipher_request *req;
+ /*
+ * total is used by PIO mode for book keeping so introduce
+ * variable total_save as need it to calc page_order
+ */
+ size_t total;
+ size_t total_save;
+
+ struct scatterlist *in_sg;
+ struct scatterlist *out_sg;
+
+ /* Buffers for copying for unaligned cases */
+ struct scatterlist in_sgl;
+ struct scatterlist out_sgl;
+ struct scatterlist *orig_out;
+ int sgs_copied;
+
+ struct scatter_walk in_walk;
+ struct scatter_walk out_walk;
+ int dma_in;
+ struct dma_chan *dma_lch_in;
+ int dma_out;
+ struct dma_chan *dma_lch_out;
+ int in_sg_len;
+ int out_sg_len;
+ int pio_only;
+ const struct omap_des_pdata *pdata;
+};
+
+/* keep registered devices data here */
+static LIST_HEAD(dev_list);
+static DEFINE_SPINLOCK(list_lock);
+
+#ifdef DEBUG
+#define omap_des_read(dd, offset) \
+ ({ \
+ int _read_ret; \
+ _read_ret = __raw_readl(dd->io_base + offset); \
+ pr_err("omap_des_read(" #offset "=%#x)= %#x\n", \
+ offset, _read_ret); \
+ _read_ret; \
+ })
+#else
+static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
+{
+ return __raw_readl(dd->io_base + offset);
+}
+#endif
+
+#ifdef DEBUG
+#define omap_des_write(dd, offset, value) \
+ do { \
+ pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
+ offset, value); \
+ __raw_writel(value, dd->io_base + offset); \
+ } while (0)
+#else
+static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
+ u32 value)
+{
+ __raw_writel(value, dd->io_base + offset);
+}
+#endif
+
+static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
+ u32 value, u32 mask)
+{
+ u32 val;
+
+ val = omap_des_read(dd, offset);
+ val &= ~mask;
+ val |= value;
+ omap_des_write(dd, offset, val);
+}
+
+static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
+ u32 *value, int count)
+{
+ for (; count--; value++, offset += 4)
+ omap_des_write(dd, offset, *value);
+}
+
+static int omap_des_hw_init(struct omap_des_dev *dd)
+{
+ /*
+ * clocks are enabled when request starts and disabled when finished.
+ * It may be long delays between requests.
+ * Device might go to off mode to save power.
+ */
+ pm_runtime_get_sync(dd->dev);
+
+ if (!(dd->flags & FLAGS_INIT)) {
+ dd->flags |= FLAGS_INIT;
+ dd->err = 0;
+ }
+
+ return 0;
+}
+
+static int omap_des_write_ctrl(struct omap_des_dev *dd)
+{
+ unsigned int key32;
+ int i, err;
+ u32 val = 0, mask = 0;
+
+ err = omap_des_hw_init(dd);
+ if (err)
+ return err;
+
+ key32 = dd->ctx->keylen / sizeof(u32);
+
+ /* it seems a key should always be set even if it has not changed */
+ for (i = 0; i < key32; i++) {
+ omap_des_write(dd, DES_REG_KEY(dd, i),
+ __le32_to_cpu(dd->ctx->key[i]));
+ }
+
+ if ((dd->flags & FLAGS_CBC) && dd->req->info)
+ omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2);
+
+ if (dd->flags & FLAGS_CBC)
+ val |= DES_REG_CTRL_CBC;
+ if (dd->flags & FLAGS_ENCRYPT)
+ val |= DES_REG_CTRL_DIRECTION;
+ if (key32 == 6)
+ val |= DES_REG_CTRL_TDES;
+
+ mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
+
+ omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
+
+ return 0;
+}
+
+static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
+{
+ u32 mask, val;
+
+ omap_des_write(dd, DES_REG_LENGTH_N(0), length);
+
+ val = dd->pdata->dma_start;
+
+ if (dd->dma_lch_out != NULL)
+ val |= dd->pdata->dma_enable_out;
+ if (dd->dma_lch_in != NULL)
+ val |= dd->pdata->dma_enable_in;
+
+ mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
+ dd->pdata->dma_start;
+
+ omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
+}
+
+static void omap_des_dma_stop(struct omap_des_dev *dd)
+{
+ u32 mask;
+
+ mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
+ dd->pdata->dma_start;
+
+ omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
+}
+
+static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
+{
+ struct omap_des_dev *dd = NULL, *tmp;
+
+ spin_lock_bh(&list_lock);
+ if (!ctx->dd) {
+ list_for_each_entry(tmp, &dev_list, list) {
+ /* FIXME: take fist available des core */
+ dd = tmp;
+ break;
+ }
+ ctx->dd = dd;
+ } else {
+ /* already found before */
+ dd = ctx->dd;
+ }
+ spin_unlock_bh(&list_lock);
+
+ return dd;
+}
+
+static void omap_des_dma_out_callback(void *data)
+{
+ struct omap_des_dev *dd = data;
+
+ /* dma_lch_out - completed */
+ tasklet_schedule(&dd->done_task);
+}
+
+static int omap_des_dma_init(struct omap_des_dev *dd)
+{
+ int err = -ENOMEM;
+ dma_cap_mask_t mask;
+
+ dd->dma_lch_out = NULL;
+ dd->dma_lch_in = NULL;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ dd->dma_lch_in = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn,
+ &dd->dma_in,
+ dd->dev, "rx");
+ if (!dd->dma_lch_in) {
+ dev_err(dd->dev, "Unable to request in DMA channel\n");
+ goto err_dma_in;
+ }
+
+ dd->dma_lch_out = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn,
+ &dd->dma_out,
+ dd->dev, "tx");
+ if (!dd->dma_lch_out) {
+ dev_err(dd->dev, "Unable to request out DMA channel\n");
+ goto err_dma_out;
+ }
+
+ return 0;
+
+err_dma_out:
+ dma_release_channel(dd->dma_lch_in);
+err_dma_in:
+ if (err)
+ pr_err("error: %d\n", err);
+ return err;
+}
+
+static void omap_des_dma_cleanup(struct omap_des_dev *dd)
+{
+ dma_release_channel(dd->dma_lch_out);
+ dma_release_channel(dd->dma_lch_in);
+}
+
+static void sg_copy_buf(void *buf, struct scatterlist *sg,
+ unsigned int start, unsigned int nbytes, int out)
+{
+ struct scatter_walk walk;
+
+ if (!nbytes)
+ return;
+
+ scatterwalk_start(&walk, sg);
+ scatterwalk_advance(&walk, start);
+ scatterwalk_copychunks(buf, &walk, nbytes, out);
+ scatterwalk_done(&walk, out, 0);
+}
+
+static int omap_des_crypt_dma(struct crypto_tfm *tfm,
+ struct scatterlist *in_sg, struct scatterlist *out_sg,
+ int in_sg_len, int out_sg_len)
+{
+ struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct omap_des_dev *dd = ctx->dd;
+ struct dma_async_tx_descriptor *tx_in, *tx_out;
+ struct dma_slave_config cfg;
+ int ret;
+
+ if (dd->pio_only) {
+ scatterwalk_start(&dd->in_walk, dd->in_sg);
+ scatterwalk_start(&dd->out_walk, dd->out_sg);
+
+ /* Enable DATAIN interrupt and let it take
+ care of the rest */
+ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
+ return 0;
+ }
+
+ dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
+
+ memset(&cfg, 0, sizeof(cfg));
+
+ cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
+ cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.src_maxburst = DST_MAXBURST;
+ cfg.dst_maxburst = DST_MAXBURST;
+
+ /* IN */
+ ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
+ if (ret) {
+ dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
+ ret);
+ return ret;
+ }
+
+ tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
+ DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tx_in) {
+ dev_err(dd->dev, "IN prep_slave_sg() failed\n");
+ return -EINVAL;
+ }
+
+ /* No callback necessary */
+ tx_in->callback_param = dd;
+
+ /* OUT */
+ ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
+ if (ret) {
+ dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
+ ret);
+ return ret;
+ }
+
+ tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
+ DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!tx_out) {
+ dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
+ return -EINVAL;
+ }
+
+ tx_out->callback = omap_des_dma_out_callback;
+ tx_out->callback_param = dd;
+
+ dmaengine_submit(tx_in);
+ dmaengine_submit(tx_out);
+
+ dma_async_issue_pending(dd->dma_lch_in);
+ dma_async_issue_pending(dd->dma_lch_out);
+
+ /* start DMA */
+ dd->pdata->trigger(dd, dd->total);
+
+ return 0;
+}
+
+static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
+{
+ struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
+ crypto_ablkcipher_reqtfm(dd->req));
+ int err;
+
+ pr_debug("total: %d\n", dd->total);
+
+ if (!dd->pio_only) {
+ err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
+ 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, dd->out_sg_len,
+ DMA_FROM_DEVICE);
+ if (!err) {
+ dev_err(dd->dev, "dma_map_sg() error\n");
+ return -EINVAL;
+ }
+ }
+
+ err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
+ dd->out_sg_len);
+ if (err && !dd->pio_only) {
+ dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
+ dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
+ DMA_FROM_DEVICE);
+ }
+
+ return err;
+}
+
+static void omap_des_finish_req(struct omap_des_dev *dd, int err)
+{
+ struct ablkcipher_request *req = dd->req;
+
+ pr_debug("err: %d\n", err);
+
+ pm_runtime_put(dd->dev);
+ dd->flags &= ~FLAGS_BUSY;
+
+ req->base.complete(&req->base, err);
+}
+
+static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
+{
+ int err = 0;
+
+ pr_debug("total: %d\n", dd->total);
+
+ omap_des_dma_stop(dd);
+
+ dmaengine_terminate_all(dd->dma_lch_in);
+ dmaengine_terminate_all(dd->dma_lch_out);
+
+ dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
+ dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE);
+
+ return err;
+}
+
+int omap_des_copy_needed(struct scatterlist *sg)
+{
+ while (sg) {
+ if (!IS_ALIGNED(sg->offset, 4))
+ return -1;
+ if (!IS_ALIGNED(sg->length, DES_BLOCK_SIZE))
+ return -1;
+ sg = sg_next(sg);
+ }
+ return 0;
+}
+
+int omap_des_copy_sgs(struct omap_des_dev *dd)
+{
+ void *buf_in, *buf_out;
+ int pages;
+
+ pages = dd->total >> PAGE_SHIFT;
+
+ if (dd->total & (PAGE_SIZE-1))
+ pages++;
+
+ BUG_ON(!pages);
+
+ buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
+ buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
+
+ if (!buf_in || !buf_out) {
+ pr_err("Couldn't allocated pages for unaligned cases.\n");
+ return -1;
+ }
+
+ dd->orig_out = dd->out_sg;
+
+ sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
+
+ sg_init_table(&dd->in_sgl, 1);
+ sg_set_buf(&dd->in_sgl, buf_in, dd->total);
+ dd->in_sg = &dd->in_sgl;
+
+ sg_init_table(&dd->out_sgl, 1);
+ sg_set_buf(&dd->out_sgl, buf_out, dd->total);
+ dd->out_sg = &dd->out_sgl;
+
+ return 0;
+}
+
+static int omap_des_handle_queue(struct omap_des_dev *dd,
+ struct ablkcipher_request *req)
+{
+ struct crypto_async_request *async_req, *backlog;
+ struct omap_des_ctx *ctx;
+ struct omap_des_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 & 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 |= 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->total_save = req->nbytes;
+ dd->in_sg = req->src;
+ dd->out_sg = req->dst;
+
+ if (omap_des_copy_needed(dd->in_sg) ||
+ omap_des_copy_needed(dd->out_sg)) {
+ if (omap_des_copy_sgs(dd))
+ pr_err("Failed to copy SGs for unaligned cases\n");
+ dd->sgs_copied = 1;
+ } else {
+ dd->sgs_copied = 0;
+ }
+
+ dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
+ dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
+ BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
+
+ rctx = ablkcipher_request_ctx(req);
+ ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
+ rctx->mode &= FLAGS_MODE_MASK;
+ dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
+
+ dd->ctx = ctx;
+ ctx->dd = dd;
+
+ err = omap_des_write_ctrl(dd);
+ if (!err)
+ err = omap_des_crypt_dma_start(dd);
+ if (err) {
+ /* des_task will not finish it, so do it here */
+ omap_des_finish_req(dd, err);
+ tasklet_schedule(&dd->queue_task);
+ }
+
+ return ret; /* return ret, which is enqueue return value */
+}
+
+static void omap_des_done_task(unsigned long data)
+{
+ struct omap_des_dev *dd = (struct omap_des_dev *)data;
+ void *buf_in, *buf_out;
+ int pages;
+
+ pr_debug("enter done_task\n");
+
+ if (!dd->pio_only) {
+ dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
+ DMA_FROM_DEVICE);
+ dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
+ dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
+ DMA_FROM_DEVICE);
+ omap_des_crypt_dma_stop(dd);
+ }
+
+ if (dd->sgs_copied) {
+ buf_in = sg_virt(&dd->in_sgl);
+ buf_out = sg_virt(&dd->out_sgl);
+
+ sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
+
+ pages = get_order(dd->total_save);
+ free_pages((unsigned long)buf_in, pages);
+ free_pages((unsigned long)buf_out, pages);
+ }
+
+ omap_des_finish_req(dd, 0);
+ omap_des_handle_queue(dd, NULL);
+
+ pr_debug("exit\n");
+}
+
+static void omap_des_queue_task(unsigned long data)
+{
+ struct omap_des_dev *dd = (struct omap_des_dev *)data;
+
+ omap_des_handle_queue(dd, NULL);
+}
+
+static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
+{
+ struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
+ crypto_ablkcipher_reqtfm(req));
+ struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req);
+ struct omap_des_dev *dd;
+
+ pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
+ !!(mode & FLAGS_ENCRYPT),
+ !!(mode & FLAGS_CBC));
+
+ if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
+ pr_err("request size is not exact amount of DES blocks\n");
+ return -EINVAL;
+ }
+
+ dd = omap_des_find_dev(ctx);
+ if (!dd)
+ return -ENODEV;
+
+ rctx->mode = mode;
+
+ return omap_des_handle_queue(dd, req);
+}
+
+/* ********************** ALG API ************************************ */
+
+static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+
+ if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
+ return -EINVAL;
+
+ pr_debug("enter, keylen: %d\n", keylen);
+
+ memcpy(ctx->key, key, keylen);
+ ctx->keylen = keylen;
+
+ return 0;
+}
+
+static int omap_des_ecb_encrypt(struct ablkcipher_request *req)
+{
+ return omap_des_crypt(req, FLAGS_ENCRYPT);
+}
+
+static int omap_des_ecb_decrypt(struct ablkcipher_request *req)
+{
+ return omap_des_crypt(req, 0);
+}
+
+static int omap_des_cbc_encrypt(struct ablkcipher_request *req)
+{
+ return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
+}
+
+static int omap_des_cbc_decrypt(struct ablkcipher_request *req)
+{
+ return omap_des_crypt(req, FLAGS_CBC);
+}
+
+static int omap_des_cra_init(struct crypto_tfm *tfm)
+{
+ pr_debug("enter\n");
+
+ tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx);
+
+ return 0;
+}
+
+static void omap_des_cra_exit(struct crypto_tfm *tfm)
+{
+ pr_debug("enter\n");
+}
+
+/* ********************** ALGS ************************************ */
+
+static struct crypto_alg algs_ecb_cbc[] = {
+{
+ .cra_name = "ecb(des)",
+ .cra_driver_name = "ecb-des-omap",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_des_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_des_cra_init,
+ .cra_exit = omap_des_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = DES_KEY_SIZE,
+ .max_keysize = DES_KEY_SIZE,
+ .setkey = omap_des_setkey,
+ .encrypt = omap_des_ecb_encrypt,
+ .decrypt = omap_des_ecb_decrypt,
+ }
+},
+{
+ .cra_name = "cbc(des)",
+ .cra_driver_name = "cbc-des-omap",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_des_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_des_cra_init,
+ .cra_exit = omap_des_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = DES_KEY_SIZE,
+ .max_keysize = DES_KEY_SIZE,
+ .ivsize = DES_BLOCK_SIZE,
+ .setkey = omap_des_setkey,
+ .encrypt = omap_des_cbc_encrypt,
+ .decrypt = omap_des_cbc_decrypt,
+ }
+},
+{
+ .cra_name = "ecb(des3_ede)",
+ .cra_driver_name = "ecb-des3-omap",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_des_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_des_cra_init,
+ .cra_exit = omap_des_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = 3*DES_KEY_SIZE,
+ .max_keysize = 3*DES_KEY_SIZE,
+ .setkey = omap_des_setkey,
+ .encrypt = omap_des_ecb_encrypt,
+ .decrypt = omap_des_ecb_decrypt,
+ }
+},
+{
+ .cra_name = "cbc(des3_ede)",
+ .cra_driver_name = "cbc-des3-omap",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_des_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_des_cra_init,
+ .cra_exit = omap_des_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = 3*DES_KEY_SIZE,
+ .max_keysize = 3*DES_KEY_SIZE,
+ .ivsize = DES_BLOCK_SIZE,
+ .setkey = omap_des_setkey,
+ .encrypt = omap_des_cbc_encrypt,
+ .decrypt = omap_des_cbc_decrypt,
+ }
+}
+};
+
+static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
+ {
+ .algs_list = algs_ecb_cbc,
+ .size = ARRAY_SIZE(algs_ecb_cbc),
+ },
+};
+
+#ifdef CONFIG_OF
+static const struct omap_des_pdata omap_des_pdata_omap4 = {
+ .algs_info = omap_des_algs_info_ecb_cbc,
+ .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
+ .trigger = omap_des_dma_trigger_omap4,
+ .key_ofs = 0x14,
+ .iv_ofs = 0x18,
+ .ctrl_ofs = 0x20,
+ .data_ofs = 0x28,
+ .rev_ofs = 0x30,
+ .mask_ofs = 0x34,
+ .irq_status_ofs = 0x3c,
+ .irq_enable_ofs = 0x40,
+ .dma_enable_in = BIT(5),
+ .dma_enable_out = BIT(6),
+ .major_mask = 0x0700,
+ .major_shift = 8,
+ .minor_mask = 0x003f,
+ .minor_shift = 0,
+};
+
+static irqreturn_t omap_des_irq(int irq, void *dev_id)
+{
+ struct omap_des_dev *dd = dev_id;
+ u32 status, i;
+ u32 *src, *dst;
+
+ status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
+ if (status & DES_REG_IRQ_DATA_IN) {
+ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
+
+ BUG_ON(!dd->in_sg);
+
+ BUG_ON(_calc_walked(in) > dd->in_sg->length);
+
+ src = sg_virt(dd->in_sg) + _calc_walked(in);
+
+ for (i = 0; i < DES_BLOCK_WORDS; i++) {
+ omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
+
+ scatterwalk_advance(&dd->in_walk, 4);
+ if (dd->in_sg->length == _calc_walked(in)) {
+ dd->in_sg = scatterwalk_sg_next(dd->in_sg);
+ if (dd->in_sg) {
+ scatterwalk_start(&dd->in_walk,
+ dd->in_sg);
+ src = sg_virt(dd->in_sg) +
+ _calc_walked(in);
+ }
+ } else {
+ src++;
+ }
+ }
+
+ /* Clear IRQ status */
+ status &= ~DES_REG_IRQ_DATA_IN;
+ omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
+
+ /* Enable DATA_OUT interrupt */
+ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
+
+ } else if (status & DES_REG_IRQ_DATA_OUT) {
+ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
+
+ BUG_ON(!dd->out_sg);
+
+ BUG_ON(_calc_walked(out) > dd->out_sg->length);
+
+ dst = sg_virt(dd->out_sg) + _calc_walked(out);
+
+ for (i = 0; i < DES_BLOCK_WORDS; i++) {
+ *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
+ scatterwalk_advance(&dd->out_walk, 4);
+ if (dd->out_sg->length == _calc_walked(out)) {
+ dd->out_sg = scatterwalk_sg_next(dd->out_sg);
+ if (dd->out_sg) {
+ scatterwalk_start(&dd->out_walk,
+ dd->out_sg);
+ dst = sg_virt(dd->out_sg) +
+ _calc_walked(out);
+ }
+ } else {
+ dst++;
+ }
+ }
+
+ dd->total -= DES_BLOCK_SIZE;
+
+ BUG_ON(dd->total < 0);
+
+ /* Clear IRQ status */
+ status &= ~DES_REG_IRQ_DATA_OUT;
+ omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
+
+ if (!dd->total)
+ /* All bytes read! */
+ tasklet_schedule(&dd->done_task);
+ else
+ /* Enable DATA_IN interrupt for next block */
+ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static const struct of_device_id omap_des_of_match[] = {
+ {
+ .compatible = "ti,omap4-des",
+ .data = &omap_des_pdata_omap4,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, omap_des_of_match);
+
+static int omap_des_get_of(struct omap_des_dev *dd,
+ struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+
+ match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "no compatible OF match\n");
+ return -EINVAL;
+ }
+
+ dd->dma_out = -1; /* Dummy value that's unused */
+ dd->dma_in = -1; /* Dummy value that's unused */
+ dd->pdata = match->data;
+
+ return 0;
+}
+#else
+static int omap_des_get_of(struct omap_des_dev *dd,
+ struct device *dev)
+{
+ return -EINVAL;
+}
+#endif
+
+static int omap_des_get_pdev(struct omap_des_dev *dd,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *r;
+ int err = 0;
+
+ /* Get the DMA out channel */
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!r) {
+ dev_err(dev, "no DMA out resource info\n");
+ err = -ENODEV;
+ goto err;
+ }
+ dd->dma_out = r->start;
+
+ /* Get the DMA in channel */
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (!r) {
+ dev_err(dev, "no DMA in resource info\n");
+ err = -ENODEV;
+ goto err;
+ }
+ dd->dma_in = r->start;
+
+ /* non-DT devices get pdata from pdev */
+ dd->pdata = pdev->dev.platform_data;
+
+err:
+ return err;
+}
+
+static int omap_des_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct omap_des_dev *dd;
+ struct crypto_alg *algp;
+ struct resource *res;
+ int err = -ENOMEM, i, j, irq = -1;
+ u32 reg;
+
+ dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
+ if (dd == NULL) {
+ dev_err(dev, "unable to alloc data struct.\n");
+ goto err_data;
+ }
+ dd->dev = dev;
+ platform_set_drvdata(pdev, dd);
+
+ spin_lock_init(&dd->lock);
+ crypto_init_queue(&dd->queue, OMAP_DES_QUEUE_LENGTH);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no MEM resource info\n");
+ goto err_res;
+ }
+
+ err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
+ omap_des_get_pdev(dd, pdev);
+ if (err)
+ goto err_res;
+
+ dd->io_base = devm_request_and_ioremap(dev, res);
+ if (!dd->io_base) {
+ dev_err(dev, "can't ioremap\n");
+ err = -ENOMEM;
+ goto err_res;
+ }
+ dd->phys_base = res->start;
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
+ omap_des_dma_stop(dd);
+
+ reg = omap_des_read(dd, DES_REG_REV(dd));
+
+ pm_runtime_put_sync(dev);
+
+ dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
+ (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
+ (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
+
+ tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
+ tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd);
+
+ err = omap_des_dma_init(dd);
+ if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
+ dd->pio_only = 1;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "can't get IRQ resource\n");
+ goto err_irq;
+ }
+
+ err = devm_request_irq(dev, irq, omap_des_irq, 0,
+ dev_name(dev), dd);
+ if (err) {
+ dev_err(dev, "Unable to grab omap-des IRQ\n");
+ goto err_irq;
+ }
+ }
+
+
+ INIT_LIST_HEAD(&dd->list);
+ spin_lock(&list_lock);
+ list_add_tail(&dd->list, &dev_list);
+ spin_unlock(&list_lock);
+
+ for (i = 0; i < dd->pdata->algs_info_size; i++) {
+ for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
+ algp = &dd->pdata->algs_info[i].algs_list[j];
+
+ pr_debug("reg alg: %s\n", algp->cra_name);
+ INIT_LIST_HEAD(&algp->cra_list);
+
+ err = crypto_register_alg(algp);
+ if (err)
+ goto err_algs;
+
+ dd->pdata->algs_info[i].registered++;
+ }
+ }
+
+ return 0;
+err_algs:
+ for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
+ for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
+ crypto_unregister_alg(
+ &dd->pdata->algs_info[i].algs_list[j]);
+ if (!dd->pio_only)
+ omap_des_dma_cleanup(dd);
+err_irq:
+ tasklet_kill(&dd->done_task);
+ tasklet_kill(&dd->queue_task);
+ pm_runtime_disable(dev);
+err_res:
+ dd = NULL;
+err_data:
+ dev_err(dev, "initialization failed.\n");
+ return err;
+}
+
+static int omap_des_remove(struct platform_device *pdev)
+{
+ struct omap_des_dev *dd = platform_get_drvdata(pdev);
+ int i, j;
+
+ if (!dd)
+ return -ENODEV;
+
+ spin_lock(&list_lock);
+ list_del(&dd->list);
+ spin_unlock(&list_lock);
+
+ for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
+ for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
+ crypto_unregister_alg(
+ &dd->pdata->algs_info[i].algs_list[j]);
+
+ tasklet_kill(&dd->done_task);
+ tasklet_kill(&dd->queue_task);
+ omap_des_dma_cleanup(dd);
+ pm_runtime_disable(dd->dev);
+ dd = NULL;
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int omap_des_suspend(struct device *dev)
+{
+ pm_runtime_put_sync(dev);
+ return 0;
+}
+
+static int omap_des_resume(struct device *dev)
+{
+ pm_runtime_get_sync(dev);
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops omap_des_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(omap_des_suspend, omap_des_resume)
+};
+
+static struct platform_driver omap_des_driver = {
+ .probe = omap_des_probe,
+ .remove = omap_des_remove,
+ .driver = {
+ .name = "omap-des",
+ .owner = THIS_MODULE,
+ .pm = &omap_des_pm_ops,
+ .of_match_table = of_match_ptr(omap_des_of_match),
+ },
+};
+
+module_platform_driver(omap_des_driver);
+
+MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Joel Fernandes <joelf at ti.com>");
--
1.7.9.5
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