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synced 2024-12-15 06:55:13 +08:00
net: korina: Use DMA API
Instead of messing with MIPS specific macros use DMA API for mapping descriptors and skbs. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Bogendoerfer
David S. Miller
parent
0fe632471a
commit
0fc96939a9
@ -110,10 +110,15 @@ struct korina_private {
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struct dma_reg __iomem *tx_dma_regs;
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struct dma_desc *td_ring; /* transmit descriptor ring */
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struct dma_desc *rd_ring; /* receive descriptor ring */
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dma_addr_t td_dma;
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dma_addr_t rd_dma;
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struct sk_buff *tx_skb[KORINA_NUM_TDS];
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struct sk_buff *rx_skb[KORINA_NUM_RDS];
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dma_addr_t rx_skb_dma[KORINA_NUM_RDS];
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dma_addr_t tx_skb_dma[KORINA_NUM_TDS];
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int rx_next_done;
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int rx_chain_head;
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int rx_chain_tail;
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@ -138,10 +143,21 @@ struct korina_private {
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struct mii_if_info mii_if;
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struct work_struct restart_task;
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struct net_device *dev;
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struct device *dmadev;
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};
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extern unsigned int idt_cpu_freq;
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static dma_addr_t korina_tx_dma(struct korina_private *lp, int idx)
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{
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return lp->td_dma + (idx * sizeof(struct dma_desc));
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}
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static dma_addr_t korina_rx_dma(struct korina_private *lp, int idx)
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{
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return lp->rd_dma + (idx * sizeof(struct dma_desc));
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}
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static inline void korina_abort_dma(struct net_device *dev,
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struct dma_reg *ch)
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{
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@ -176,14 +192,17 @@ static void korina_abort_rx(struct net_device *dev)
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static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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{
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struct korina_private *lp = netdev_priv(dev);
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unsigned long flags;
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u32 length;
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u32 chain_prev, chain_next;
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unsigned long flags;
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struct dma_desc *td;
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dma_addr_t ca;
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u32 length;
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int idx;
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spin_lock_irqsave(&lp->lock, flags);
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td = &lp->td_ring[lp->tx_chain_tail];
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idx = lp->tx_chain_tail;
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td = &lp->td_ring[idx];
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/* stop queue when full, drop pkts if queue already full */
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if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
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@ -191,26 +210,26 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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if (lp->tx_count == (KORINA_NUM_TDS - 2))
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netif_stop_queue(dev);
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else {
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dev->stats.tx_dropped++;
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dev_kfree_skb_any(skb);
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spin_unlock_irqrestore(&lp->lock, flags);
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return NETDEV_TX_OK;
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}
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else
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goto drop_packet;
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}
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lp->tx_count++;
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lp->tx_skb[lp->tx_chain_tail] = skb;
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lp->tx_skb[idx] = skb;
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length = skb->len;
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dma_cache_wback((u32)skb->data, skb->len);
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/* Setup the transmit descriptor. */
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td->ca = CPHYSADDR(skb->data);
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chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
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chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
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ca = dma_map_single(lp->dmadev, skb->data, length, DMA_TO_DEVICE);
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if (dma_mapping_error(lp->dmadev, ca))
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goto drop_packet;
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lp->tx_skb_dma[idx] = ca;
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td->ca = ca;
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chain_prev = (idx - 1) & KORINA_TDS_MASK;
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chain_next = (idx + 1) & KORINA_TDS_MASK;
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if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
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if (lp->tx_chain_status == desc_empty) {
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@ -220,8 +239,8 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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/* Move tail */
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lp->tx_chain_tail = chain_next;
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/* Write to NDPTR */
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writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
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&lp->tx_dma_regs->dmandptr);
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writel(korina_tx_dma(lp, lp->tx_chain_head),
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&lp->tx_dma_regs->dmandptr);
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/* Move head to tail */
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lp->tx_chain_head = lp->tx_chain_tail;
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} else {
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@ -232,12 +251,12 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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lp->td_ring[chain_prev].control &=
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~DMA_DESC_COF;
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/* Link to prev */
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lp->td_ring[chain_prev].link = CPHYSADDR(td);
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lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
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/* Move tail */
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lp->tx_chain_tail = chain_next;
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/* Write to NDPTR */
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writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
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&(lp->tx_dma_regs->dmandptr));
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writel(korina_tx_dma(lp, lp->tx_chain_head),
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&lp->tx_dma_regs->dmandptr);
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/* Move head to tail */
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lp->tx_chain_head = lp->tx_chain_tail;
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lp->tx_chain_status = desc_empty;
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@ -256,7 +275,7 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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DMA_DESC_COF | DMA_DESC_IOF;
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lp->td_ring[chain_prev].control &=
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~DMA_DESC_COF;
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lp->td_ring[chain_prev].link = CPHYSADDR(td);
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lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
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lp->tx_chain_tail = chain_next;
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}
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}
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@ -264,6 +283,13 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
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netif_trans_update(dev);
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spin_unlock_irqrestore(&lp->lock, flags);
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return NETDEV_TX_OK;
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drop_packet:
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dev->stats.tx_dropped++;
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dev_kfree_skb_any(skb);
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spin_unlock_irqrestore(&lp->lock, flags);
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return NETDEV_TX_OK;
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}
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@ -344,8 +370,8 @@ static int korina_rx(struct net_device *dev, int limit)
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struct korina_private *lp = netdev_priv(dev);
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struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
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struct sk_buff *skb, *skb_new;
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u8 *pkt_buf;
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u32 devcs, pkt_len, dmas;
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dma_addr_t ca;
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int count;
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for (count = 0; count < limit; count++) {
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@ -381,20 +407,22 @@ static int korina_rx(struct net_device *dev, int limit)
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goto next;
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}
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pkt_len = RCVPKT_LENGTH(devcs);
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/* must be the (first and) last
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* descriptor then */
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pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
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/* invalidate the cache */
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dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
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/* Malloc up new buffer. */
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skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
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if (!skb_new)
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break;
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ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE,
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DMA_FROM_DEVICE);
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if (dma_mapping_error(lp->dmadev, ca)) {
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dev_kfree_skb_any(skb_new);
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break;
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}
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pkt_len = RCVPKT_LENGTH(devcs);
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dma_unmap_single(lp->dmadev, lp->rx_skb_dma[lp->rx_next_done],
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pkt_len, DMA_FROM_DEVICE);
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/* Do not count the CRC */
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skb_put(skb, pkt_len - 4);
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skb->protocol = eth_type_trans(skb, dev);
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@ -409,15 +437,13 @@ static int korina_rx(struct net_device *dev, int limit)
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dev->stats.multicast++;
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lp->rx_skb[lp->rx_next_done] = skb_new;
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lp->rx_skb_dma[lp->rx_next_done] = ca;
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next:
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rd->devcs = 0;
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/* Restore descriptor's curr_addr */
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if (skb_new)
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rd->ca = CPHYSADDR(skb_new->data);
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else
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rd->ca = CPHYSADDR(skb->data);
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rd->ca = lp->rx_skb_dma[lp->rx_next_done];
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rd->control = DMA_COUNT(KORINA_RBSIZE) |
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DMA_DESC_COD | DMA_DESC_IOD;
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@ -438,9 +464,9 @@ next:
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lp->dma_halt_cnt++;
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rd->devcs = 0;
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skb = lp->rx_skb[lp->rx_next_done];
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rd->ca = CPHYSADDR(skb->data);
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writel(CPHYSADDR(rd), &lp->rx_dma_regs->dmandptr);
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rd->ca = lp->rx_skb_dma[lp->rx_next_done];
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writel(korina_rx_dma(lp, rd - lp->rd_ring),
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&lp->rx_dma_regs->dmandptr);
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}
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return count;
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@ -563,6 +589,10 @@ static void korina_tx(struct net_device *dev)
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/* We must always free the original skb */
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if (lp->tx_skb[lp->tx_next_done]) {
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dma_unmap_single(lp->dmadev,
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lp->tx_skb_dma[lp->tx_next_done],
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lp->tx_skb[lp->tx_next_done]->len,
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DMA_TO_DEVICE);
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dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
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lp->tx_skb[lp->tx_next_done] = NULL;
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}
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@ -609,8 +639,8 @@ korina_tx_dma_interrupt(int irq, void *dev_id)
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if (lp->tx_chain_status == desc_filled &&
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(readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
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writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
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&(lp->tx_dma_regs->dmandptr));
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writel(korina_tx_dma(lp, lp->tx_chain_head),
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&lp->tx_dma_regs->dmandptr);
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lp->tx_chain_status = desc_empty;
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lp->tx_chain_head = lp->tx_chain_tail;
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netif_trans_update(dev);
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@ -730,6 +760,7 @@ static int korina_alloc_ring(struct net_device *dev)
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{
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struct korina_private *lp = netdev_priv(dev);
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struct sk_buff *skb;
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dma_addr_t ca;
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int i;
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/* Initialize the transmit descriptors */
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@ -752,13 +783,18 @@ static int korina_alloc_ring(struct net_device *dev)
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lp->rd_ring[i].control = DMA_DESC_IOD |
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DMA_COUNT(KORINA_RBSIZE);
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lp->rd_ring[i].devcs = 0;
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lp->rd_ring[i].ca = CPHYSADDR(skb->data);
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lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
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ca = dma_map_single(lp->dmadev, skb->data, KORINA_RBSIZE,
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DMA_FROM_DEVICE);
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if (dma_mapping_error(lp->dmadev, ca))
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return -ENOMEM;
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lp->rd_ring[i].ca = ca;
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lp->rx_skb_dma[i] = ca;
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lp->rd_ring[i].link = korina_rx_dma(lp, i + 1);
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}
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/* loop back receive descriptors, so the last
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* descriptor points to the first one */
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lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
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lp->rd_ring[i - 1].link = lp->rd_dma;
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lp->rd_ring[i - 1].control |= DMA_DESC_COD;
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lp->rx_next_done = 0;
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@ -776,16 +812,22 @@ static void korina_free_ring(struct net_device *dev)
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for (i = 0; i < KORINA_NUM_RDS; i++) {
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lp->rd_ring[i].control = 0;
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if (lp->rx_skb[i])
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if (lp->rx_skb[i]) {
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dma_unmap_single(lp->dmadev, lp->rx_skb_dma[i],
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KORINA_RBSIZE, DMA_FROM_DEVICE);
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dev_kfree_skb_any(lp->rx_skb[i]);
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lp->rx_skb[i] = NULL;
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lp->rx_skb[i] = NULL;
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}
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}
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for (i = 0; i < KORINA_NUM_TDS; i++) {
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lp->td_ring[i].control = 0;
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if (lp->tx_skb[i])
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if (lp->tx_skb[i]) {
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dma_unmap_single(lp->dmadev, lp->tx_skb_dma[i],
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lp->tx_skb[i]->len, DMA_TO_DEVICE);
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dev_kfree_skb_any(lp->tx_skb[i]);
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lp->tx_skb[i] = NULL;
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lp->tx_skb[i] = NULL;
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}
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}
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}
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@ -818,7 +860,7 @@ static int korina_init(struct net_device *dev)
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writel(0, &lp->rx_dma_regs->dmas);
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/* Start Rx DMA */
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writel(0, &lp->rx_dma_regs->dmandptr);
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writel(CPHYSADDR(&lp->rd_ring[0]), &lp->rx_dma_regs->dmadptr);
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writel(korina_rx_dma(lp, 0), &lp->rx_dma_regs->dmadptr);
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writel(readl(&lp->tx_dma_regs->dmasm) &
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~(DMA_STAT_FINI | DMA_STAT_ERR),
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@ -1053,21 +1095,21 @@ static int korina_probe(struct platform_device *pdev)
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}
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lp->tx_dma_regs = p;
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lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
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lp->td_ring = dmam_alloc_coherent(&pdev->dev, TD_RING_SIZE,
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&lp->td_dma, GFP_KERNEL);
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if (!lp->td_ring)
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return -ENOMEM;
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dma_cache_inv((unsigned long)(lp->td_ring),
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TD_RING_SIZE + RD_RING_SIZE);
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/* now convert TD_RING pointer to KSEG1 */
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lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
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lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
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lp->rd_ring = dmam_alloc_coherent(&pdev->dev, RD_RING_SIZE,
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&lp->rd_dma, GFP_KERNEL);
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if (!lp->rd_ring)
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return -ENOMEM;
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spin_lock_init(&lp->lock);
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/* just use the rx dma irq */
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dev->irq = lp->rx_irq;
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lp->dev = dev;
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lp->dmadev = &pdev->dev;
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dev->netdev_ops = &korina_netdev_ops;
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dev->ethtool_ops = &netdev_ethtool_ops;
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@ -1085,7 +1127,6 @@ static int korina_probe(struct platform_device *pdev)
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if (rc < 0) {
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printk(KERN_ERR DRV_NAME
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": cannot register net device: %d\n", rc);
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kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
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return rc;
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}
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timer_setup(&lp->media_check_timer, korina_poll_media, 0);
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@ -1100,9 +1141,6 @@ static int korina_probe(struct platform_device *pdev)
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static int korina_remove(struct platform_device *pdev)
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{
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struct korina_device *bif = platform_get_drvdata(pdev);
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struct korina_private *lp = netdev_priv(bif->dev);
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kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
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unregister_netdev(bif->dev);
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