diff options
Diffstat (limited to 'drivers/crypto/qce/dma.c')
-rw-r--r-- | drivers/crypto/qce/dma.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c new file mode 100644 index 0000000000..46db5bf366 --- /dev/null +++ b/drivers/crypto/qce/dma.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. + */ + +#include <linux/dmaengine.h> +#include <crypto/scatterwalk.h> + +#include "dma.h" + +int qce_dma_request(struct device *dev, struct qce_dma_data *dma) +{ + int ret; + + dma->txchan = dma_request_chan(dev, "tx"); + if (IS_ERR(dma->txchan)) + return PTR_ERR(dma->txchan); + + dma->rxchan = dma_request_chan(dev, "rx"); + if (IS_ERR(dma->rxchan)) { + ret = PTR_ERR(dma->rxchan); + goto error_rx; + } + + dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ, + GFP_KERNEL); + if (!dma->result_buf) { + ret = -ENOMEM; + goto error_nomem; + } + + dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ; + + return 0; +error_nomem: + dma_release_channel(dma->rxchan); +error_rx: + dma_release_channel(dma->txchan); + return ret; +} + +void qce_dma_release(struct qce_dma_data *dma) +{ + dma_release_channel(dma->txchan); + dma_release_channel(dma->rxchan); + kfree(dma->result_buf); +} + +struct scatterlist * +qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl, + unsigned int max_len) +{ + struct scatterlist *sg = sgt->sgl, *sg_last = NULL; + unsigned int new_len; + + while (sg) { + if (!sg_page(sg)) + break; + sg = sg_next(sg); + } + + if (!sg) + return ERR_PTR(-EINVAL); + + while (new_sgl && sg && max_len) { + new_len = new_sgl->length > max_len ? max_len : new_sgl->length; + sg_set_page(sg, sg_page(new_sgl), new_len, new_sgl->offset); + sg_last = sg; + sg = sg_next(sg); + new_sgl = sg_next(new_sgl); + max_len -= new_len; + } + + return sg_last; +} + +static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg, + int nents, unsigned long flags, + enum dma_transfer_direction dir, + dma_async_tx_callback cb, void *cb_param) +{ + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + + if (!sg || !nents) + return -EINVAL; + + desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags); + if (!desc) + return -EINVAL; + + desc->callback = cb; + desc->callback_param = cb_param; + cookie = dmaengine_submit(desc); + + return dma_submit_error(cookie); +} + +int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg, + int rx_nents, struct scatterlist *tx_sg, int tx_nents, + dma_async_tx_callback cb, void *cb_param) +{ + struct dma_chan *rxchan = dma->rxchan; + struct dma_chan *txchan = dma->txchan; + unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; + int ret; + + ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV, + NULL, NULL); + if (ret) + return ret; + + return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM, + cb, cb_param); +} + +void qce_dma_issue_pending(struct qce_dma_data *dma) +{ + dma_async_issue_pending(dma->rxchan); + dma_async_issue_pending(dma->txchan); +} + +int qce_dma_terminate_all(struct qce_dma_data *dma) +{ + int ret; + + ret = dmaengine_terminate_all(dma->rxchan); + return ret ?: dmaengine_terminate_all(dma->txchan); +} |