From: Joel Fernandes Subject: [PATCH v2 09/14] crypto: omap-aes: PIO mode: platform data for OMAP4/AM437x and trigger Date: Sat, 17 Aug 2013 21:42:30 -0500 Message-ID: <1376793755-30478-10-git-send-email-joelf@ti.com> References: <1376793755-30478-1-git-send-email-joelf@ti.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Linux OMAP List , Linux ARM Kernel List , Linux Kernel Mailing List , Linux Crypto Mailing List , Joel Fernandes To: Herbert Xu , "David S. Miller" , Mark Greer , Tony Lindgren , Santosh Shilimkar , Rajendra Nayak , Lokesh Vutla Return-path: In-Reply-To: <1376793755-30478-1-git-send-email-joelf@ti.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org We initialize the scatter gather walk lists needed for PIO mode and avoid all DMA paths such as mapping/unmapping buffers by checking for the pio_only flag. Signed-off-by: Joel Fernandes --- drivers/crypto/omap-aes.c | 43 ++++++++++++++++++++++++++++++------------- 1 file changed, 30 insertions(+), 13 deletions(-) diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c index 889dc99..62b3260 100644 --- a/drivers/crypto/omap-aes.c +++ b/drivers/crypto/omap-aes.c @@ -168,6 +168,7 @@ struct omap_aes_dev { struct dma_chan *dma_lch_out; int in_sg_len; int out_sg_len; + int pio_only; const struct omap_aes_pdata *pdata; }; @@ -413,6 +414,16 @@ static int omap_aes_crypt_dma(struct crypto_tfm *tfm, 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_aes_write(dd, AES_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)); @@ -482,21 +493,25 @@ static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd) pr_debug("total: %d\n", dd->total); - 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; - } + 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 = 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_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len, dd->out_sg_len); - if (err) { + 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); @@ -600,9 +615,11 @@ static void omap_aes_done_task(unsigned long data) pr_debug("enter done_task\n"); - dma_sync_sg_for_cpu(dd->dev, dd->in_sg, dd->in_sg_len, DMA_FROM_DEVICE); - - omap_aes_crypt_dma_stop(dd); + if (!dd->pio_only) { + dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len, + DMA_FROM_DEVICE); + omap_aes_crypt_dma_stop(dd); + } omap_aes_finish_req(dd, 0); omap_aes_handle_queue(dd, NULL); -- 1.7.9.5