58 		 "in tx chain");
268  * spider_net_free_chain - free descriptor chain
270  * @chain: address of chain
275 		      struct spider_net_descr_chain *chain)  in spider_net_free_chain()  argument
279 	descr = chain->ring;  in spider_net_free_chain()
284 	} while (descr != chain->ring);  in spider_net_free_chain()
286 	dma_free_coherent(&card->pdev->dev, chain->num_desc * sizeof(struct spider_net_hw_descr),  in spider_net_free_chain()
287 			  chain->hwring, chain->dma_addr);  in spider_net_free_chain()
291  * spider_net_init_chain - alloc and link descriptor chain
293  * @chain: address of chain
302 		       struct spider_net_descr_chain *chain)  in spider_net_init_chain()  argument
310 	alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);  in spider_net_init_chain()
312 	chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,  in spider_net_init_chain()
313 					   &chain->dma_addr, GFP_KERNEL);  in spider_net_init_chain()
314 	if (!chain->hwring)  in spider_net_init_chain()
318 	descr = chain->ring;  in spider_net_init_chain()
319 	hwdescr = chain->hwring;  in spider_net_init_chain()
320 	buf = chain->dma_addr;  in spider_net_init_chain()
321 	for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {  in spider_net_init_chain()
333 	(descr-1)->next = chain->ring;  in spider_net_init_chain()
334 	chain->ring->prev = descr-1;  in spider_net_init_chain()
336 	spin_lock_init(&chain->lock);  in spider_net_init_chain()
337 	chain->head = chain->ring;  in spider_net_init_chain()
338 	chain->tail = chain->ring;  in spider_net_init_chain()
343  * spider_net_free_rx_chain_contents - frees descr contents in rx chain
432  * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
435  * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
442 	/* assume chain is aligned correctly */  in spider_net_enable_rxchtails()
480  * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
485 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_refill_rx_chain()  local
492 	if (!spin_trylock_irqsave(&chain->lock, flags))  in spider_net_refill_rx_chain()
495 	while (spider_net_get_descr_status(chain->head->hwdescr) ==  in spider_net_refill_rx_chain()
497 		if (spider_net_prepare_rx_descr(card, chain->head))  in spider_net_refill_rx_chain()
499 		chain->head = chain->head->next;  in spider_net_refill_rx_chain()
502 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_refill_rx_chain()
514 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_alloc_rx_skbs()  local
515 	struct spider_net_descr *start = chain->tail;  in spider_net_alloc_rx_skbs()
518 	/* Link up the hardware chain pointers */  in spider_net_alloc_rx_skbs()
524 	/* Put at least one buffer into the chain. if this fails,  in spider_net_alloc_rx_skbs()
527 	if (spider_net_prepare_rx_descr(card, chain->head))  in spider_net_alloc_rx_skbs()
530 		chain->head = chain->head->next;  in spider_net_alloc_rx_skbs()
644 	struct spider_net_descr_chain *chain = &card->tx_chain;  in spider_net_prepare_tx_descr()  local
659 	spin_lock_irqsave(&chain->lock, flags);  in spider_net_prepare_tx_descr()
661 	if (descr->next == chain->tail->prev) {  in spider_net_prepare_tx_descr()
662 		spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_prepare_tx_descr()
667 	chain->head = descr->next;  in spider_net_prepare_tx_descr()
677 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_prepare_tx_descr()
689 	/* Chain the bus address, so that the DMA engine finds this descr. */  in spider_net_prepare_tx_descr()
756 	struct spider_net_descr_chain *chain = &card->tx_chain;  in spider_net_release_tx_chain()  local
765 		spin_lock_irqsave(&chain->lock, flags);  in spider_net_release_tx_chain()
766 		if (chain->tail == chain->head) {  in spider_net_release_tx_chain()
767 			spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
770 		descr = chain->tail;  in spider_net_release_tx_chain()
782 				spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
803 				spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
808 		chain->tail = descr->next;  in spider_net_release_tx_chain()
813 		spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
832  * Writes the current tx chain head as start address
833  * of the tx descriptor chain and enables the transmission
978 	struct spider_net_descr_chain *chain = &card->rx_chain;  in show_rx_chain()  local
979 	struct spider_net_descr *start= chain->tail;  in show_rx_chain()
988 	int off = start - chain->ring;  in show_rx_chain()
992 		chain->num_desc);  in show_rx_chain()
993 	dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",  in show_rx_chain()
1003 		off = descr - chain->ring;  in show_rx_chain()
1006 		if (descr == chain->head)  in show_rx_chain()
1007 			dev_info(dev, "Chain head is at %d, head status=0x%x\n",  in show_rx_chain()
1019 			dev_info(dev, "chain is cut at %d\n", off);  in show_rx_chain()
1022 			int from = (chain->num_desc + off - cnt) % chain->num_desc;  in show_rx_chain()
1023 			int to = (chain->num_desc + off - 1) % chain->num_desc;  in show_rx_chain()
1045 		cnt = descr - chain->ring;  in show_rx_chain()
1071  * to "catch up" to where the hardware chain pointer is at.
1076 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_resync_head_ptr()  local
1081 	descr = chain->head;  in spider_net_resync_head_ptr()
1087 	spin_lock_irqsave(&chain->lock, flags);  in spider_net_resync_head_ptr()
1089 	descr = chain->head;  in spider_net_resync_head_ptr()
1091 	for (i=0; i<chain->num_desc; i++) {  in spider_net_resync_head_ptr()
1096 	chain->head = descr;  in spider_net_resync_head_ptr()
1098 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_resync_head_ptr()
1103 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_resync_tail_ptr()  local
1108 	descr = chain->tail;  in spider_net_resync_tail_ptr()
1111 	for (i=0; i<chain->num_desc; i++) {  in spider_net_resync_tail_ptr()
1117 	chain->tail = descr;  in spider_net_resync_tail_ptr()
1119 	if ((i == chain->num_desc) || (i == 0))  in spider_net_resync_tail_ptr()
1139 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_decode_one_descr()  local
1140 	struct spider_net_descr *descr = chain->tail;  in spider_net_decode_one_descr()
1153 	chain->tail = descr->next;  in spider_net_decode_one_descr()
1429 		/* chain end. If a descriptor should be sent, kick off  in spider_net_handle_error_irq()
1457 		/* Could happen when rx chain is full */  in spider_net_handle_error_irq()
1475 	/* chain end */  in spider_net_handle_error_irq()
1493 		/* Could happen when rx chain is full */  in spider_net_handle_error_irq()
1755 	/* set chain tail address for RX chains and  in spider_net_enable_card()