crypto: omap-aes - Add support for multiple cores

Some SoCs like omap4/omap5/dra7 contain multiple AES crypto accelerator
cores. Adapt the driver to support this. The driver picks the last used
device from a list of AES devices.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
[t-kristo@ti.com: forward ported to 4.7 kernel]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index f2aae4a..7615026 100644 (file)
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -330,20 +330,12 @@ static void omap_aes_dma_stop(struct omap_aes_dev *dd)
 
 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
 {
-       struct omap_aes_dev *dd = NULL, *tmp;
+       struct omap_aes_dev *dd;
 
        spin_lock_bh(&list_lock);
-       if (!ctx->dd) {
-               list_for_each_entry(tmp, &dev_list, list) {
-                       /* FIXME: take fist available aes core */
-                       dd = tmp;
-                       break;
-               }
-               ctx->dd = dd;
-       } else {
-               /* already found before */
-               dd = ctx->dd;
-       }
+       dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
+       list_move_tail(&dd->list, &dev_list);
+       ctx->dd = dd;
        spin_unlock_bh(&list_lock);
 
        return dd;
@@ -616,7 +608,7 @@ static int omap_aes_prepare_req(struct crypto_engine *engine,
 {
        struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
                        crypto_ablkcipher_reqtfm(req));
-       struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
+       struct omap_aes_dev *dd = ctx->dd;
        struct omap_aes_reqctx *rctx;
 
        if (!dd)
@@ -662,7 +654,7 @@ static int omap_aes_crypt_req(struct crypto_engine *engine,
 {
        struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
                        crypto_ablkcipher_reqtfm(req));
-       struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
+       struct omap_aes_dev *dd = ctx->dd;
 
        if (!dd)
                return -ENODEV;