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improve ethernet driver debugging 

SVN-Revision: 32471
owl
Florian Fainelli 2012-06-20 21:57:49 +00:00
parent 3b0dba382b
commit 9a2367aa6d
1 changed files with 100 additions and 17 deletions
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117
target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
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@ -139,6 +139,7 @@ struct nuport_mac_priv {
struct phy_device *phydev;
int old_link;
int old_duplex;
u32 msg_level;
};
void dcache_invalidate_only(unsigned long start, unsigned long end)
@ -231,8 +232,10 @@ static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
while (timeout--) {
reg = nuport_mac_readl(TX_START_DMA);
if (!(reg & 0x01))
if (!(reg & 0x01)) {
netdev_dbg(priv->dev, "dma ready\n");
break;
}
cpu_relax();
}
@ -243,7 +246,7 @@ static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
skb->len, DMA_TO_DEVICE);
/* enable enhanced mode */
nuport_mac_writel(0x03, TX_DMA_ENH);
nuport_mac_writel(0x01, TX_DMA_ENH);
nuport_mac_writel(p, TX_BUFFER_ADDR);
nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
wmb();
@ -261,10 +264,24 @@ static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
nuport_mac_writel(reg, TX_START_DMA);
}
static void nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
struct sk_buff *skb)
{
dma_addr_t p;
u32 reg;
unsigned int timeout = 2048;
while (timeout--) {
reg = nuport_mac_readl(RX_START_DMA);
if (!(reg & 0x01)) {
netdev_dbg(priv->dev, "dma ready\n");
break;
}
cpu_relax();
}
if (!timeout)
return -EBUSY;
p = dma_map_single(&priv->pdev->dev, skb->data,
RX_ALLOC_SIZE, DMA_FROM_DEVICE);
@ -272,6 +289,8 @@ static void nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
nuport_mac_writel(p, RX_BUFFER_ADDR);
wmb();
nuport_mac_writel(0x01, RX_START_DMA);
return 0;
}
static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
@ -309,11 +328,16 @@ static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct nuport_mac_priv *priv = netdev_priv(dev);
int ret;
dcache_clean_range((u32) skb->data, (u32)(skb->data + skb->len));
if (netif_queue_stopped(dev)) {
netdev_warn(dev, "netif queue was stopped, restarting\n");
netif_start_queue(dev);
}
spin_lock_irqsave(&priv->lock, flags);
if (priv->first_pkt) {
ret = nuport_mac_start_tx_dma(priv, skb);
if (ret) {
netif_stop_queue(dev);
spin_unlock_irqrestore(&priv->lock, flags);
netdev_err(dev, "transmit path busy\n");
return NETDEV_TX_BUSY;
@ -335,6 +359,7 @@ static int nuport_mac_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (priv->valid_txskb[priv->cur_tx]) {
priv->tx_full = 1;
netdev_err(dev, "stopping queue\n");
netif_stop_queue(dev);
}
@ -407,8 +432,20 @@ static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
struct sk_buff *skb;
unsigned long flags;
int ret;
u32 reg;
spin_lock_irqsave(&priv->lock, flags);
/* clear status word available if ready */
reg = nuport_mac_readl(TX_START_DMA);
if (reg & (1 << 18)) {
nuport_mac_writel(reg, TX_START_DMA);
reg = nuport_mac_readl(TX_DMA_STATUS);
if (reg & 1)
dev->stats.tx_errors++;
} else
netdev_dbg(dev, "no status word: %08x\n", reg);
skb = priv->tx_skb[priv->dma_tx];
priv->tx_skb[priv->dma_tx] = NULL;
priv->valid_txskb[priv->dma_tx] = 0;
@ -427,7 +464,7 @@ static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
}
if (priv->tx_full) {
netdev_err(dev, "restarting transmit queue\n");
netdev_dbg(dev, "restarting transmit queue\n");
netif_wake_queue(dev);
priv->tx_full = 0;
}
@ -442,7 +479,7 @@ static unsigned int nuport_mac_has_work(struct nuport_mac_priv *priv)
unsigned int i;
for (i = 0; i < RX_RING_SIZE; i++)
if (priv->irq_rxskb[i])
if (priv->rx_skb[i])
return 1;
return 0;
@ -453,24 +490,33 @@ static irqreturn_t nuport_mac_rx_interrupt(int irq, void *dev_id)
struct net_device *dev = (struct net_device *)dev_id;
struct nuport_mac_priv *priv = netdev_priv(dev);
unsigned long flags;
int ret;
spin_lock_irqsave(&priv->lock, flags);
priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4;
priv->irq_rxskb[priv->dma_rx] = 0;
priv->dma_rx++;
if (!priv->rx_full) {
priv->pkt_len[priv->dma_rx] = nuport_mac_readl(RX_ACT_BYTES) - 4;
priv->irq_rxskb[priv->dma_rx] = 0;
priv->dma_rx++;
if (priv->dma_rx >= RX_RING_SIZE)
priv->dma_rx = 0;
if (priv->dma_rx >= RX_RING_SIZE)
priv->dma_rx = 0;
} else
priv->rx_full = 0;
if (priv->irq_rxskb[priv->dma_rx] == 1)
nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
if (priv->irq_rxskb[priv->dma_rx] == 1) {
ret = nuport_mac_start_rx_dma(priv, priv->rx_skb[priv->dma_rx]);
if (ret)
netdev_err(dev, "failed to start rx dma\n");
} else {
priv->rx_full = 1;
netdev_dbg(dev, "RX ring full\n");
}
if (likely(nuport_mac_has_work(priv))) {
/* find a way to disable DMA rx irq */
nuport_mac_disable_rx_dma(priv);
napi_schedule(&priv->napi);
}
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
@ -742,9 +788,7 @@ static int nuport_mac_open(struct net_device *dev)
nuport_mac_reset_rx_dma(priv);
/* Start RX DMA */
nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
return 0;
return nuport_mac_start_rx_dma(priv, priv->rx_skb[0]);
out_rx_skb:
nuport_mac_free_rx_ring(priv);
@ -782,6 +826,26 @@ static int nuport_mac_close(struct net_device *dev)
return 0;
}
static void nuport_mac_tx_timeout(struct net_device *dev)
{
struct nuport_mac_priv *priv = netdev_priv(dev);
unsigned int i;
netdev_warn(dev, "transmit timeout, attempting recovery\n");
netdev_info(dev, "TX DMA regs\n");
for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(TX_DMA_BASE + i));
netdev_info(dev, "RX DMA regs\n");
for (i = 0; i < DMA_CHAN_WIDTH; i += 4)
netdev_info(dev, "[%02x]: 0x%08x\n", i, nuport_mac_readl(RX_DMA_BASE + i));
nuport_mac_init_tx_ring(priv);
nuport_mac_reset_tx_dma(priv);
netif_wake_queue(dev);
}
static int nuport_mac_mii_probe(struct net_device *dev)
{
struct nuport_mac_priv *priv = netdev_priv(dev);
@ -864,11 +928,27 @@ static int nuport_mac_ethtool_set_settings(struct net_device *dev,
return -EINVAL;
}
static void nuport_mac_set_msglevel(struct net_device *dev, u32 msg_level)
{
struct nuport_mac_priv *priv = netdev_priv(dev);
priv->msg_level = msg_level;
}
static u32 nuport_mac_get_msglevel(struct net_device *dev)
{
struct nuport_mac_priv *priv = netdev_priv(dev);
return priv->msg_level;
}
static const struct ethtool_ops nuport_mac_ethtool_ops = {
.get_drvinfo = nuport_mac_ethtool_drvinfo,
.get_link = ethtool_op_get_link,
.get_settings = nuport_mac_ethtool_get_settings,
.set_settings = nuport_mac_ethtool_set_settings,
.set_msglevel = nuport_mac_set_msglevel,
.get_msglevel = nuport_mac_get_msglevel,
};
static const struct net_device_ops nuport_mac_ops = {
@ -878,6 +958,7 @@ static const struct net_device_ops nuport_mac_ops = {
.ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = nuport_mac_change_mac_address,
.ndo_tx_timeout = nuport_mac_tx_timeout,
};
static int __init nuport_mac_probe(struct platform_device *pdev)
@ -951,10 +1032,12 @@ static int __init nuport_mac_probe(struct platform_device *pdev)
priv->link_irq = link_irq;
priv->rx_irq = rx_irq;
priv->tx_irq = tx_irq;
priv->msg_level = NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK;
dev->netdev_ops = &nuport_mac_ops;
dev->ethtool_ops = &nuport_mac_ethtool_ops;
dev->watchdog_timeo = HZ;
dev->flags = IFF_BROADCAST; /* Supports Broadcast */
dev->tx_queue_len = TX_RING_SIZE / 2;
netif_napi_add(dev, &priv->napi, nuport_mac_poll, 64);