1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright 2014-2015 Analog Devices Inc.
4  *  Author: Lars-Peter Clausen <lars@metafoo.de>
10 #include <linux/dma-mapping.h>
19 #include <linux/iio/buffer-dma.h>
20 #include <linux/iio/buffer-dmaengine.h>
36 	struct list_head active;  member
54 	spin_lock_irqsave(&block->queue->list_lock, flags);  in iio_dmaengine_buffer_block_done()
55 	list_del(&block->head);  in iio_dmaengine_buffer_block_done()
56 	spin_unlock_irqrestore(&block->queue->list_lock, flags);  in iio_dmaengine_buffer_block_done()
57 	block->bytes_used -= result->residue;  in iio_dmaengine_buffer_block_done()
65 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_submit_block()
69 	block->bytes_used = min(block->size, dmaengine_buffer->max_size);  in iio_dmaengine_buffer_submit_block()
70 	block->bytes_used = rounddown(block->bytes_used,  in iio_dmaengine_buffer_submit_block()
71 			dmaengine_buffer->align);  in iio_dmaengine_buffer_submit_block()
73 	desc = dmaengine_prep_slave_single(dmaengine_buffer->chan,  in iio_dmaengine_buffer_submit_block()
74 		block->phys_addr, block->bytes_used, DMA_DEV_TO_MEM,  in iio_dmaengine_buffer_submit_block()
77 		return -ENOMEM;  in iio_dmaengine_buffer_submit_block()
79 	desc->callback_result = iio_dmaengine_buffer_block_done;  in iio_dmaengine_buffer_submit_block()
80 	desc->callback_param = block;  in iio_dmaengine_buffer_submit_block()
86 	spin_lock_irq(&dmaengine_buffer->queue.list_lock);  in iio_dmaengine_buffer_submit_block()
87 	list_add_tail(&block->head, &dmaengine_buffer->active);  in iio_dmaengine_buffer_submit_block()
88 	spin_unlock_irq(&dmaengine_buffer->queue.list_lock);  in iio_dmaengine_buffer_submit_block()
90 	dma_async_issue_pending(dmaengine_buffer->chan);  in iio_dmaengine_buffer_submit_block()
98 		iio_buffer_to_dmaengine_buffer(&queue->buffer);  in iio_dmaengine_buffer_abort()
100 	dmaengine_terminate_sync(dmaengine_buffer->chan);  in iio_dmaengine_buffer_abort()
101 	iio_dma_buffer_block_list_abort(queue, &dmaengine_buffer->active);  in iio_dmaengine_buffer_abort()
109 	iio_dma_buffer_release(&dmaengine_buffer->queue);  in iio_dmaengine_buffer_release()
137 		iio_buffer_to_dmaengine_buffer(indio_dev->buffer);  in iio_dmaengine_buffer_get_length_align()
139 	return sprintf(buf, "%zu\n", dmaengine_buffer->align);  in iio_dmaengine_buffer_get_length_align()
151  * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
173 		return ERR_PTR(-ENOMEM);  in iio_dmaengine_buffer_alloc()
196 	INIT_LIST_HEAD(&dmaengine_buffer->active);  in iio_dmaengine_buffer_alloc()
197 	dmaengine_buffer->chan = chan;  in iio_dmaengine_buffer_alloc()
198 	dmaengine_buffer->align = width;  in iio_dmaengine_buffer_alloc()
199 	dmaengine_buffer->max_size = dma_get_max_seg_size(chan->device->dev);  in iio_dmaengine_buffer_alloc()
201 	iio_dma_buffer_init(&dmaengine_buffer->queue, chan->device->dev,  in iio_dmaengine_buffer_alloc()
203 	iio_buffer_set_attrs(&dmaengine_buffer->queue.buffer,  in iio_dmaengine_buffer_alloc()
206 	dmaengine_buffer->queue.buffer.access = &iio_dmaengine_buffer_ops;  in iio_dmaengine_buffer_alloc()
208 	return &dmaengine_buffer->queue.buffer;  in iio_dmaengine_buffer_alloc()
216  * iio_dmaengine_buffer_free() - Free dmaengine buffer
226 	iio_dma_buffer_exit(&dmaengine_buffer->queue);  in iio_dmaengine_buffer_free()
227 	dma_release_channel(dmaengine_buffer->chan);  in iio_dmaengine_buffer_free()
238  * devm_iio_dmaengine_buffer_alloc() - Resource-managed iio_dmaengine_buffer_alloc()
246  * The buffer will be automatically de-allocated once the device gets destroyed.
256 		return ERR_PTR(-ENOMEM);  in devm_iio_dmaengine_buffer_alloc()
271 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");