diff options
Diffstat (limited to 'drivers/net/ethernet/broadcom/bcm4908_enet.c')
| -rw-r--r-- | drivers/net/ethernet/broadcom/bcm4908_enet.c | 144 |
1 files changed, 108 insertions, 36 deletions
diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c index 98cf82dea3e4..60d908507f51 100644 --- a/drivers/net/ethernet/broadcom/bcm4908_enet.c +++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c @@ -9,6 +9,7 @@ #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_net.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/string.h> @@ -53,6 +54,7 @@ struct bcm4908_enet_dma_ring { int length; u16 cfg_block; u16 st_ram_block; + struct napi_struct napi; union { void *cpu_addr; @@ -66,8 +68,8 @@ struct bcm4908_enet_dma_ring { struct bcm4908_enet { struct device *dev; struct net_device *netdev; - struct napi_struct napi; void __iomem *base; + int irq_tx; struct bcm4908_enet_dma_ring tx_ring; struct bcm4908_enet_dma_ring rx_ring; @@ -122,24 +124,31 @@ static void enet_umac_set(struct bcm4908_enet *enet, u16 offset, u32 set) * Helpers */ -static void bcm4908_enet_intrs_on(struct bcm4908_enet *enet) +static void bcm4908_enet_set_mtu(struct bcm4908_enet *enet, int mtu) { - enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, ENET_DMA_INT_DEFAULTS); + enet_umac_write(enet, UMAC_MAX_FRAME_LEN, mtu + ENET_MAX_ETH_OVERHEAD); } -static void bcm4908_enet_intrs_off(struct bcm4908_enet *enet) +/*** + * DMA ring ops + */ + +static void bcm4908_enet_dma_ring_intrs_on(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) { - enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, 0); + enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG_INT_MASK, ENET_DMA_INT_DEFAULTS); } -static void bcm4908_enet_intrs_ack(struct bcm4908_enet *enet) +static void bcm4908_enet_dma_ring_intrs_off(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) { - enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_STAT, ENET_DMA_INT_DEFAULTS); + enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG_INT_MASK, 0); } -static void bcm4908_enet_set_mtu(struct bcm4908_enet *enet, int mtu) +static void bcm4908_enet_dma_ring_intrs_ack(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) { - enet_umac_write(enet, UMAC_MAX_FRAME_LEN, mtu + ENET_MAX_ETH_OVERHEAD); + enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG_INT_STAT, ENET_DMA_INT_DEFAULTS); } /*** @@ -172,6 +181,7 @@ static int bcm4908_dma_alloc_buf_descs(struct bcm4908_enet *enet, err_free_buf_descs: dma_free_coherent(dev, size, ring->cpu_addr, ring->dma_addr); + ring->cpu_addr = NULL; return -ENOMEM; } @@ -413,11 +423,14 @@ static void bcm4908_enet_gmac_init(struct bcm4908_enet *enet) static irqreturn_t bcm4908_enet_irq_handler(int irq, void *dev_id) { struct bcm4908_enet *enet = dev_id; + struct bcm4908_enet_dma_ring *ring; - bcm4908_enet_intrs_off(enet); - bcm4908_enet_intrs_ack(enet); + ring = (irq == enet->irq_tx) ? &enet->tx_ring : &enet->rx_ring; - napi_schedule(&enet->napi); + bcm4908_enet_dma_ring_intrs_off(enet, ring); + bcm4908_enet_dma_ring_intrs_ack(enet, ring); + + napi_schedule(&ring->napi); return IRQ_HANDLED; } @@ -425,6 +438,8 @@ static irqreturn_t bcm4908_enet_irq_handler(int irq, void *dev_id) static int bcm4908_enet_open(struct net_device *netdev) { struct bcm4908_enet *enet = netdev_priv(netdev); + struct bcm4908_enet_dma_ring *tx_ring = &enet->tx_ring; + struct bcm4908_enet_dma_ring *rx_ring = &enet->rx_ring; struct device *dev = enet->dev; int err; @@ -434,6 +449,17 @@ static int bcm4908_enet_open(struct net_device *netdev) return err; } + if (enet->irq_tx > 0) { + err = request_irq(enet->irq_tx, bcm4908_enet_irq_handler, 0, + "tx", enet); + if (err) { + dev_err(dev, "Failed to request IRQ %d: %d\n", + enet->irq_tx, err); + free_irq(netdev->irq, enet); + return err; + } + } + bcm4908_enet_gmac_init(enet); bcm4908_enet_dma_reset(enet); bcm4908_enet_dma_init(enet); @@ -442,14 +468,19 @@ static int bcm4908_enet_open(struct net_device *netdev) enet_set(enet, ENET_DMA_CONTROLLER_CFG, ENET_DMA_CTRL_CFG_MASTER_EN); enet_maskset(enet, ENET_DMA_CONTROLLER_CFG, ENET_DMA_CTRL_CFG_FLOWC_CH1_EN, 0); - bcm4908_enet_dma_rx_ring_enable(enet, &enet->rx_ring); - napi_enable(&enet->napi); + if (enet->irq_tx > 0) { + napi_enable(&tx_ring->napi); + bcm4908_enet_dma_ring_intrs_ack(enet, tx_ring); + bcm4908_enet_dma_ring_intrs_on(enet, tx_ring); + } + + bcm4908_enet_dma_rx_ring_enable(enet, rx_ring); + napi_enable(&rx_ring->napi); netif_carrier_on(netdev); netif_start_queue(netdev); - - bcm4908_enet_intrs_ack(enet); - bcm4908_enet_intrs_on(enet); + bcm4908_enet_dma_ring_intrs_ack(enet, rx_ring); + bcm4908_enet_dma_ring_intrs_on(enet, rx_ring); return 0; } @@ -457,16 +488,20 @@ static int bcm4908_enet_open(struct net_device *netdev) static int bcm4908_enet_stop(struct net_device *netdev) { struct bcm4908_enet *enet = netdev_priv(netdev); + struct bcm4908_enet_dma_ring *tx_ring = &enet->tx_ring; + struct bcm4908_enet_dma_ring *rx_ring = &enet->rx_ring; netif_stop_queue(netdev); netif_carrier_off(netdev); - napi_disable(&enet->napi); + napi_disable(&rx_ring->napi); + napi_disable(&tx_ring->napi); bcm4908_enet_dma_rx_ring_disable(enet, &enet->rx_ring); bcm4908_enet_dma_tx_ring_disable(enet, &enet->tx_ring); bcm4908_enet_dma_uninit(enet); + free_irq(enet->irq_tx, enet); free_irq(enet->netdev->irq, enet); return 0; @@ -483,25 +518,19 @@ static int bcm4908_enet_start_xmit(struct sk_buff *skb, struct net_device *netde u32 tmp; /* Free transmitted skbs */ - while (ring->read_idx != ring->write_idx) { - buf_desc = &ring->buf_desc[ring->read_idx]; - if (le32_to_cpu(buf_desc->ctl) & DMA_CTL_STATUS_OWN) - break; - slot = &ring->slots[ring->read_idx]; - - dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE); - dev_kfree_skb(slot->skb); - if (++ring->read_idx == ring->length) - ring->read_idx = 0; - } + if (enet->irq_tx < 0 && + !(le32_to_cpu(ring->buf_desc[ring->read_idx].ctl) & DMA_CTL_STATUS_OWN)) + napi_schedule(&enet->tx_ring.napi); /* Don't use the last empty buf descriptor */ if (ring->read_idx <= ring->write_idx) free_buf_descs = ring->read_idx - ring->write_idx + ring->length; else free_buf_descs = ring->read_idx - ring->write_idx; - if (free_buf_descs < 2) + if (free_buf_descs < 2) { + netif_stop_queue(netdev); return NETDEV_TX_BUSY; + } /* Hardware removes OWN bit after sending data */ buf_desc = &ring->buf_desc[ring->write_idx]; @@ -538,9 +567,10 @@ static int bcm4908_enet_start_xmit(struct sk_buff *skb, struct net_device *netde return NETDEV_TX_OK; } -static int bcm4908_enet_poll(struct napi_struct *napi, int weight) +static int bcm4908_enet_poll_rx(struct napi_struct *napi, int weight) { - struct bcm4908_enet *enet = container_of(napi, struct bcm4908_enet, napi); + struct bcm4908_enet_dma_ring *rx_ring = container_of(napi, struct bcm4908_enet_dma_ring, napi); + struct bcm4908_enet *enet = container_of(rx_ring, struct bcm4908_enet, rx_ring); struct device *dev = enet->dev; int handled = 0; @@ -589,7 +619,7 @@ static int bcm4908_enet_poll(struct napi_struct *napi, int weight) if (handled < weight) { napi_complete_done(napi, handled); - bcm4908_enet_intrs_on(enet); + bcm4908_enet_dma_ring_intrs_on(enet, rx_ring); } /* Hardware could disable ring if it run out of descriptors */ @@ -598,6 +628,42 @@ static int bcm4908_enet_poll(struct napi_struct *napi, int weight) return handled; } +static int bcm4908_enet_poll_tx(struct napi_struct *napi, int weight) +{ + struct bcm4908_enet_dma_ring *tx_ring = container_of(napi, struct bcm4908_enet_dma_ring, napi); + struct bcm4908_enet *enet = container_of(tx_ring, struct bcm4908_enet, tx_ring); + struct bcm4908_enet_dma_ring_bd *buf_desc; + struct bcm4908_enet_dma_ring_slot *slot; + struct device *dev = enet->dev; + unsigned int bytes = 0; + int handled = 0; + + while (handled < weight && tx_ring->read_idx != tx_ring->write_idx) { + buf_desc = &tx_ring->buf_desc[tx_ring->read_idx]; + if (le32_to_cpu(buf_desc->ctl) & DMA_CTL_STATUS_OWN) + break; + slot = &tx_ring->slots[tx_ring->read_idx]; + + dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE); + dev_kfree_skb(slot->skb); + bytes += slot->len; + if (++tx_ring->read_idx == tx_ring->length) + tx_ring->read_idx = 0; + + handled++; + } + + if (handled < weight) { + napi_complete_done(napi, handled); + bcm4908_enet_dma_ring_intrs_on(enet, tx_ring); + } + + if (netif_queue_stopped(enet->netdev)) + netif_wake_queue(enet->netdev); + + return handled; +} + static int bcm4908_enet_change_mtu(struct net_device *netdev, int new_mtu) { struct bcm4908_enet *enet = netdev_priv(netdev); @@ -640,6 +706,8 @@ static int bcm4908_enet_probe(struct platform_device *pdev) if (netdev->irq < 0) return netdev->irq; + enet->irq_tx = platform_get_irq_byname(pdev, "tx"); + dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); err = bcm4908_enet_dma_alloc(enet); @@ -647,12 +715,15 @@ static int bcm4908_enet_probe(struct platform_device *pdev) return err; SET_NETDEV_DEV(netdev, &pdev->dev); - eth_hw_addr_random(netdev); + err = of_get_mac_address(dev->of_node, netdev->dev_addr); + if (err) + eth_hw_addr_random(netdev); netdev->netdev_ops = &bcm4908_enet_netdev_ops; netdev->min_mtu = ETH_ZLEN; netdev->mtu = ETH_DATA_LEN; netdev->max_mtu = ENET_MTU_MAX; - netif_napi_add(netdev, &enet->napi, bcm4908_enet_poll, 64); + netif_tx_napi_add(netdev, &enet->tx_ring.napi, bcm4908_enet_poll_tx, NAPI_POLL_WEIGHT); + netif_napi_add(netdev, &enet->rx_ring.napi, bcm4908_enet_poll_rx, NAPI_POLL_WEIGHT); err = register_netdev(netdev); if (err) { @@ -670,7 +741,8 @@ static int bcm4908_enet_remove(struct platform_device *pdev) struct bcm4908_enet *enet = platform_get_drvdata(pdev); unregister_netdev(enet->netdev); - netif_napi_del(&enet->napi); + netif_napi_del(&enet->rx_ring.napi); + netif_napi_del(&enet->tx_ring.napi); bcm4908_enet_dma_free(enet); return 0; |