drivers/dma/pch_dma.c

80 	struct pch_dma_desc_regs desc[MAX_CHAN_NR];
314 static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
323 		pd_chan->chan.chan_id, desc->regs.dev_addr);
325 		pd_chan->chan.chan_id, desc->regs.mem_addr);
327 		pd_chan->chan.chan_id, desc->regs.size);
329 		pd_chan->chan.chan_id, desc->regs.next);
331 	if (list_empty(&desc->tx_list)) {
332 		channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
333 		channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
334 		channel_writel(pd_chan, SIZE, desc->regs.size);
335 		channel_writel(pd_chan, NEXT, desc->regs.next);
338 		channel_writel(pd_chan, NEXT, desc->txd.phys);
344 			       struct pch_dma_desc *desc)
346 	struct dma_async_tx_descriptor *txd = &desc->txd;
350 	list_splice_init(&desc->tx_list, &pd_chan->free_list);
351 	list_move(&desc->desc_node, &pd_chan->free_list);
358 	struct pch_dma_desc *desc, *_d;
369 	list_for_each_entry_safe(desc, _d, &list, desc_node)
370 		pdc_chain_complete(pd_chan, desc);
405 	struct pch_dma_desc *desc = to_pd_desc(txd);
411 		list_add_tail(&desc->desc_node, &pd_chan->active_list);
412 		pdc_dostart(pd_chan, desc);
414 		list_add_tail(&desc->desc_node, &pd_chan->queue);
423 	struct pch_dma_desc *desc = NULL;
427 	desc = dma_pool_zalloc(pd->pool, flags, &addr);
428 	if (desc) {
429 		INIT_LIST_HEAD(&desc->tx_list);
430 		dma_async_tx_descriptor_init(&desc->txd, chan);
431 		desc->txd.tx_submit = pd_tx_submit;
432 		desc->txd.flags = DMA_CTRL_ACK;
433 		desc->txd.phys = addr;
436 	return desc;
441 	struct pch_dma_desc *desc, *_d;
446 	list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) {
448 		if (async_tx_test_ack(&desc->txd)) {
449 			list_del(&desc->desc_node);
450 			ret = desc;
453 		dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc);
466 				"failed to alloc desc\n");
474 			 struct pch_dma_desc *desc)
476 	if (desc) {
478 		list_splice_init(&desc->tx_list, &pd_chan->free_list);
479 		list_add(&desc->desc_node, &pd_chan->free_list);
487 	struct pch_dma_desc *desc;
500 		desc = pdc_alloc_desc(chan, GFP_KERNEL);
502 		if (!desc) {
508 		list_add_tail(&desc->desc_node, &tmp_list);
526 	struct pch_dma_desc *desc, *_d;
538 	list_for_each_entry_safe(desc, _d, &tmp_list, desc_node)
539 		dma_pool_free(pd->pool, desc, desc->txd.phys);
570 	struct pch_dma_desc *desc = NULL;
591 		desc = pdc_desc_get(pd_chan);
593 		if (!desc)
596 		desc->regs.dev_addr = reg;
597 		desc->regs.mem_addr = sg_dma_address(sg);
598 		desc->regs.size = sg_dma_len(sg);
599 		desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ;
603 			if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE)
605 			desc->regs.size |= DMA_DESC_WIDTH_1_BYTE;
608 			if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES)
610 			desc->regs.size |= DMA_DESC_WIDTH_2_BYTES;
613 			if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES)
615 			desc->regs.size |= DMA_DESC_WIDTH_4_BYTES;
622 			first = desc;
624 			prev->regs.next |= desc->txd.phys;
625 			list_add_tail(&desc->desc_node, &first->tx_list);
628 		prev = desc;
632 		desc->regs.next = DMA_DESC_END_WITH_IRQ;
634 		desc->regs.next = DMA_DESC_END_WITHOUT_IRQ;
637 	desc->txd.flags = flags;
642 	dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n");
650 	struct pch_dma_desc *desc, *_d;
660 	list_for_each_entry_safe(desc, _d, &list, desc_node)
661 		pdc_chain_complete(pd_chan, desc);
872 		pd_chan->membase = &regs->desc[i];