drivers/crypto/omap-aes.c

Source file repositories/reference/linux-study-clean/drivers/crypto/omap-aes.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/omap-aes.c
Extension
.c
Size
31070 bytes
Lines
1308
Domain
Driver Families
Bucket
drivers/crypto
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
		}

		cb_desc = tx_out;
	} else {
		cb_desc = tx_in;
	}

	if (dd->flags & FLAGS_GCM)
		cb_desc->callback = omap_aes_gcm_dma_out_callback;
	else
		cb_desc->callback = omap_aes_dma_out_callback;
	cb_desc->callback_param = dd;


	dmaengine_submit(tx_in);
	if (tx_out)
		dmaengine_submit(tx_out);

	dma_async_issue_pending(dd->dma_lch_in);
	if (out_sg_len)
		dma_async_issue_pending(dd->dma_lch_out);

	/* start DMA */
	dd->pdata->trigger(dd, dd->total);

	return 0;
}

int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
{
	int err;

	pr_debug("total: %zu\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;
		}

		if (dd->out_sg_len) {
			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(dd, 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);
		if (dd->out_sg_len)
			dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
				     DMA_FROM_DEVICE);
	}

	return err;
}

static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
{
	struct skcipher_request *req = dd->req;

	pr_debug("err: %d\n", err);

	crypto_finalize_skcipher_request(dd->engine, req, err);

	pm_runtime_put_autosuspend(dd->dev);
}

int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
{

Annotation

Implementation Notes