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linux/drivers/crypto/omap-des.c
Corentin LABBE 7d55693152 crypto: omap - use of_device_get_match_data 
The usage of of_device_get_match_data reduce the code size a bit.
Furthermore, it prevents an improbable dereference when
of_match_device() return NULL.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-10-07 12:10:35 +08:00

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/*
* Support for OMAP DES and Triple DES HW acceleration.
*
* Copyright (c) 2013 Texas Instruments Incorporated
* Author: Joel Fernandes <joelf@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/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>
#include <crypto/algapi.h>
#include <crypto/engine.h>
#include "omap-crypto.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)
#define DEFAULT_AUTOSUSPEND_DELAY 1000
#define FLAGS_IN_DATA_ST_SHIFT 8
#define FLAGS_OUT_DATA_ST_SHIFT 10
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;
struct tasklet_struct done_task;
struct ablkcipher_request *req;
struct crypto_engine *engine;
/*
* 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;
struct scatter_walk in_walk;
struct scatter_walk out_walk;
struct dma_chan *dma_lch_in;
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)
{
int err;
/*
* 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.
*/
err = pm_runtime_get_sync(dd->dev);
if (err < 0) {
pm_runtime_put_noidle(dd->dev);
dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
return err;
}
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;
dd->dma_lch_out = NULL;
dd->dma_lch_in = NULL;
dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
if (IS_ERR(dd->dma_lch_in)) {
dev_err(dd->dev, "Unable to request in DMA channel\n");
return PTR_ERR(dd->dma_lch_in);
}
dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
if (IS_ERR(dd->dma_lch_out)) {
dev_err(dd->dev, "Unable to request out DMA channel\n");
err = PTR_ERR(dd->dma_lch_out);
goto err_dma_out;
}
return 0;
err_dma_out:
dma_release_channel(dd->dma_lch_in);
return err;
}
static void omap_des_dma_cleanup(struct omap_des_dev *dd)
{
if (dd->pio_only)
return;
dma_release_channel(dd->dma_lch_out);
dma_release_channel(dd->dma_lch_in);
}
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);
crypto_finalize_cipher_request(dd->engine, req, err);
pm_runtime_mark_last_busy(dd->dev);
pm_runtime_put_autosuspend(dd->dev);
}
static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
{
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);
return 0;
}
static int omap_des_handle_queue(struct omap_des_dev *dd,
struct ablkcipher_request *req)
{
if (req)
return crypto_transfer_cipher_request_to_engine(dd->engine, req);
return 0;
}
static int omap_des_prepare_req(struct crypto_engine *engine,
struct ablkcipher_request *req)
{
struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct omap_des_dev *dd = omap_des_find_dev(ctx);
struct omap_des_reqctx *rctx;
int ret;
u16 flags;
if (!dd)
return -ENODEV;
/* 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;
dd->orig_out = req->dst;
flags = OMAP_CRYPTO_COPY_DATA;
if (req->src == req->dst)
flags |= OMAP_CRYPTO_FORCE_COPY;
ret = omap_crypto_align_sg(&dd->in_sg, dd->total, DES_BLOCK_SIZE,
&dd->in_sgl, flags,
FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
if (ret)
return ret;
ret = omap_crypto_align_sg(&dd->out_sg, dd->total, DES_BLOCK_SIZE,
&dd->out_sgl, 0,
FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
if (ret)
return ret;
dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
if (dd->in_sg_len < 0)
return dd->in_sg_len;
dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
if (dd->out_sg_len < 0)
return dd->out_sg_len;
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;
return omap_des_write_ctrl(dd);
}
static int omap_des_crypt_req(struct crypto_engine *engine,
struct ablkcipher_request *req)
{
struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
crypto_ablkcipher_reqtfm(req));
struct omap_des_dev *dd = omap_des_find_dev(ctx);
if (!dd)
return -ENODEV;
return omap_des_crypt_dma_start(dd);
}
static void omap_des_done_task(unsigned long data)
{
struct omap_des_dev *dd = (struct omap_des_dev *)data;
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);
}
omap_crypto_cleanup(&dd->in_sgl, NULL, 0, dd->total_save,
FLAGS_IN_DATA_ST_SHIFT, dd->flags);
omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
omap_des_finish_req(dd, 0);
pr_debug("exit\n");
}
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 *cipher, const u8 *key,
unsigned int keylen)
{
struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(cipher);
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
return -EINVAL;
pr_debug("enter, keylen: %d\n", keylen);
/* Do we need to test against weak key? */
if (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY) {
u32 tmp[DES_EXPKEY_WORDS];
int ret = des_ekey(tmp, key);
if (!ret) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
}
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 = 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 = 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++;
}
}
BUG_ON(dd->total < DES_BLOCK_SIZE);
dd->total -= DES_BLOCK_SIZE;
/* 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)
{
dd->pdata = of_device_get_match_data(&pdev->dev);
if (!dd->pdata) {
dev_err(&pdev->dev, "no compatible OF match\n");
return -EINVAL;
}
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)
{
/* non-DT devices get pdata from pdev */
dd->pdata = pdev->dev.platform_data;
return 0;
}
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);
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_ioremap_resource(dev, res);
if (IS_ERR(dd->io_base)) {
err = PTR_ERR(dd->io_base);
goto err_res;
}
dd->phys_base = res->start;
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
pm_runtime_enable(dev);
err = pm_runtime_get_sync(dev);
if (err < 0) {
pm_runtime_put_noidle(dev);
dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
goto err_get;
}
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);
err = omap_des_dma_init(dd);
if (err == -EPROBE_DEFER) {
goto err_irq;
} else 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: %d\n", irq);
err = irq;
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);
/* Initialize des crypto engine */
dd->engine = crypto_engine_alloc_init(dev, 1);
if (!dd->engine) {
err = -ENOMEM;
goto err_engine;
}
dd->engine->prepare_cipher_request = omap_des_prepare_req;
dd->engine->cipher_one_request = omap_des_crypt_req;
err = crypto_engine_start(dd->engine);
if (err)
goto err_engine;
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]);
err_engine:
if (dd->engine)
crypto_engine_exit(dd->engine);
omap_des_dma_cleanup(dd);
err_irq:
tasklet_kill(&dd->done_task);
err_get:
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);
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)
{
int err;
err = pm_runtime_get_sync(dev);
if (err < 0) {
pm_runtime_put_noidle(dev);
dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
return err;
}
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(omap_des_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",
.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@ti.com>");
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