dma/sh/usb-dmac.c

71  * @desc: the current descriptor
81 	struct usb_dmac_desc *desc;
196 	struct usb_dmac_desc *desc = chan->desc;
197 	struct usb_dmac_sg *sg = desc->sg + index;
202 	if (desc->direction == DMA_DEV_TO_MEM)
228 		chan->desc = NULL;
239 	chan->desc = to_usb_dmac_desc(vd);
240 	chan->desc->sg_index = 0;
266 	struct usb_dmac_desc *desc;
269 	desc = kzalloc(struct_size(desc, sg, sg_len), gfp);
270 	if (!desc)
273 	desc->sg_allocated_len = sg_len;
274 	INIT_LIST_HEAD(&desc->node);
277 	list_add_tail(&desc->node, &chan->desc_freed);
285 	struct usb_dmac_desc *desc, *_desc;
291 	list_for_each_entry_safe(desc, _desc, &list, node) {
292 		list_del(&desc->node);
293 		kfree(desc);
301 	struct usb_dmac_desc *desc = NULL;
306 	list_for_each_entry(desc, &chan->desc_freed, node) {
307 		if (sg_len <= desc->sg_allocated_len) {
308 			list_move_tail(&desc->node, &chan->desc_got);
310 			return desc;
317 		/* If allocated the desc, it was added to tail of the list */
319 		desc = list_last_entry(&chan->desc_freed, struct usb_dmac_desc,
321 		list_move_tail(&desc->node, &chan->desc_got);
323 		return desc;
330 			      struct usb_dmac_desc *desc)
335 	list_move_tail(&desc->node, &chan->desc_freed);
421 	struct usb_dmac_desc *desc;
431 	desc = usb_dmac_desc_get(uchan, sg_len, GFP_NOWAIT);
432 	if (!desc)
435 	desc->direction = dir;
436 	desc->sg_len = sg_len;
438 		desc->sg[i].mem_addr = sg_dma_address(sg);
439 		desc->sg[i].size = sg_dma_len(sg);
442 	return vchan_tx_prep(&uchan->vc, &desc->vd, dma_flags);
448 	struct usb_dmac_desc *desc, *_desc;
456 	if (uchan->desc)
457 		uchan->desc = NULL;
459 	list_for_each_entry_safe(desc, _desc, &list, node)
460 		list_move_tail(&desc->node, &uchan->desc_freed);
468 						 struct usb_dmac_desc *desc,
471 	struct usb_dmac_sg *sg = desc->sg + sg_index;
479 	if (desc->direction == DMA_DEV_TO_MEM)
490 	struct usb_dmac_desc *desc;
493 	list_for_each_entry_reverse(desc, &chan->desc_freed, node) {
494 		if (desc->done_cookie == cookie) {
495 			residue = desc->residue;
508 	struct usb_dmac_desc *desc = chan->desc;
511 	if (!desc) {
515 		desc = to_usb_dmac_desc(vd);
519 	for (i = desc->sg_index + 1; i < desc->sg_len; i++)
520 		residue += desc->sg[i].size;
523 	residue += usb_dmac_get_current_residue(chan, desc, desc->sg_index);
560 	if (vchan_issue_pending(&uchan->vc) && !uchan->desc)
567 	struct usb_dmac_desc *desc = to_usb_dmac_desc(vd);
570 	usb_dmac_desc_put(chan, desc);
579 	struct usb_dmac_desc *desc = chan->desc;
581 	BUG_ON(!desc);
583 	if (++desc->sg_index < desc->sg_len) {
584 		usb_dmac_chan_start_sg(chan, desc->sg_index);
586 		desc->residue = usb_dmac_get_current_residue(chan, desc,
587 							desc->sg_index - 1);
588 		desc->done_cookie = desc->vd.tx.cookie;
589 		desc->vd.tx_result.result = DMA_TRANS_NOERROR;
590 		desc->vd.tx_result.residue = desc->residue;
591 		vchan_cookie_complete(&desc->vd);
593 		/* Restart the next transfer if this driver has a next desc */