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[mcs814x] nuport-mac: add definitions of the various bits/masks used
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32727 3c298f89-4303-0410-b956-a3cf2f4a3e73
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florian committed Jul 15, 2012
1 parent 7c32e6a commit c2e42c1
Showing 1 changed file with 67 additions and 24 deletions.
91 changes: 67 additions & 24 deletions target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
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Expand Up @@ -32,15 +32,30 @@
#define MAC_BASE_ADDR ((priv->mac_base))

#define CTRL_REG (MAC_BASE_ADDR)
#define MII_BUSY 0x00000001
#define MII_WRITE 0x00000002
#define MII_BUSY (1 << 0)
#define MII_WRITE (1 << 1)
#define RX_ENABLE (1 << 2)
#define TX_ENABLE (1 << 3)
#define DEFER_CHECK (1 << 5)
#define STRIP_PAD (1 << 8)
#define DRTRY_DISABLE (1 << 10)
#define FULL_DUPLEX (1 << 20)
#define HBD_DISABLE (1 << 28)
#define MAC_ADDR_HIGH_REG (MAC_BASE_ADDR + 0x04)
#define MAC_ADDR_LOW_REG (MAC_BASE_ADDR + 0x08)
#define MII_ADDR_REG (MAC_BASE_ADDR + 0x14)
#define MII_ADDR_SHIFT (11)
#define MII_REG_SHIFT (6)
#define MII_DATA_REG (MAC_BASE_ADDR + 0x18)
/* Link interrupt registers */
#define LINK_INT_CSR (MAC_BASE_ADDR + 0xD0)
#define LINK_INT_EN (1 << 0)
#define LINK_PHY_ADDR_SHIFT (1)
#define LINK_PHY_REG_SHIFT (6)
#define LINK_BIT_UP_SHIFT (11)
#define LINK_UP (1 << 16)
#define LINK_INT_POLL_TIME (MAC_BASE_ADDR + 0xD4)
#define LINK_POLL_MASK ((1 << 20) - 1)

#define DMA_CHAN_WIDTH 32
#define DMA_RX_CHAN 0
Expand All @@ -53,7 +68,11 @@
#define RX_MAX_BYTES (RX_DMA_BASE + 0x04)
#define RX_ACT_BYTES (RX_DMA_BASE + 0x08)
#define RX_START_DMA (RX_DMA_BASE + 0x0C)
#define RX_DMA_ENABLE (1 << 0)
#define RX_DMA_RESET (1 << 1)
#define RX_DMA_STATUS_FIFO (1 << 12)
#define RX_DMA_ENH (RX_DMA_BASE + 0x14)
#define RX_DMA_INT_ENABLE (1 << 1)

/* Transmit DMA registers */
#define TX_DMA_BASE ((priv->dma_base) + \
Expand All @@ -62,8 +81,19 @@
#define TX_PKT_BYTES (TX_DMA_BASE + 0x04)
#define TX_BYTES_SENT (TX_DMA_BASE + 0x08)
#define TX_START_DMA (TX_DMA_BASE + 0x0C)
#define TX_DMA_ENABLE (1 << 0)
#define TX_DMA_START_FRAME (1 << 2)
#define TX_DMA_END_FRAME (1 << 3)
#define TX_DMA_PAD_DISABLE (1 << 8)
#define TX_DMA_CRC_DISABLE (1 << 9)
#define TX_DMA_FIFO_FULL (1 << 16)
#define TX_DMA_FIFO_EMPTY (1 << 17)
#define TX_DMA_STATUS_AVAIL (1 << 18)
#define TX_DMA_RESET (1 << 24)
#define TX_DMA_STATUS (TX_DMA_BASE + 0x10)
#define TX_DMA_ENH (TX_DMA_BASE + 0x14)
#define TX_DMA_ENH_ENABLE (1 << 0)
#define TX_DMA_INT_FIFO (1 << 1)

#define RX_ALLOC_SIZE SZ_2K
#define MAX_ETH_FRAME_SIZE 1536
Expand Down Expand Up @@ -170,7 +200,7 @@ static int nuport_mac_mii_read(struct mii_bus *bus,
if (ret)
return ret;

val |= (mii_id << 11) | (regnum << 6) | MII_BUSY;
val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT) | MII_BUSY;
nuport_mac_writel(val, MII_ADDR_REG);
ret = nuport_mac_mii_busy_wait(priv);
if (ret)
Expand All @@ -191,7 +221,8 @@ static int nuport_mac_mii_write(struct mii_bus *bus, int mii_id,
if (ret)
return ret;

val |= (mii_id << 11) | (regnum << 6) | MII_BUSY | MII_WRITE;
val |= (mii_id << MII_ADDR_SHIFT) | (regnum << MII_REG_SHIFT);
val |= MII_BUSY | MII_WRITE;
nuport_mac_writel(value, MII_DATA_REG);
nuport_mac_writel(val, MII_ADDR_REG);

Expand All @@ -212,7 +243,7 @@ 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 & TX_DMA_ENABLE)) {
netdev_dbg(priv->dev, "dma ready\n");
break;
}
Expand All @@ -226,11 +257,12 @@ static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
skb->len, DMA_TO_DEVICE);

/* enable enhanced mode */
nuport_mac_writel(0x01, TX_DMA_ENH);
nuport_mac_writel(TX_DMA_ENH_ENABLE, TX_DMA_ENH);
nuport_mac_writel(p, TX_BUFFER_ADDR);
nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
wmb();
nuport_mac_writel(0x0D, TX_START_DMA);
reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME;
nuport_mac_writel(reg, TX_START_DMA);

return 0;
}
Expand All @@ -240,7 +272,7 @@ static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
u32 reg;

reg = nuport_mac_readl(TX_START_DMA);
reg |= (1 << 24);
reg |= TX_DMA_RESET;
nuport_mac_writel(reg, TX_START_DMA);
}

Expand All @@ -253,7 +285,7 @@ static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,

while (timeout--) {
reg = nuport_mac_readl(RX_START_DMA);
if (!(reg & 0x01)) {
if (!(reg & RX_DMA_ENABLE)) {
netdev_dbg(priv->dev, "dma ready\n");
break;
}
Expand All @@ -268,7 +300,7 @@ static int 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);
nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA);

return 0;
}
Expand All @@ -278,7 +310,7 @@ static void nuport_mac_reset_rx_dma(struct nuport_mac_priv *priv)
u32 reg;

reg = nuport_mac_readl(RX_START_DMA);
reg |= (1 << 1);
reg |= RX_DMA_RESET;
nuport_mac_writel(reg, RX_START_DMA);
}

Expand All @@ -288,7 +320,7 @@ static void nuport_mac_disable_rx_dma(struct nuport_mac_priv *priv)
u32 reg;

reg = nuport_mac_readl(RX_DMA_ENH);
reg &= ~(1 << 1);
reg &= ~RX_DMA_INT_ENABLE;
nuport_mac_writel(reg, RX_DMA_ENH);
}

Expand All @@ -297,7 +329,7 @@ static void nuport_mac_enable_rx_dma(struct nuport_mac_priv *priv)
u32 reg;

reg = nuport_mac_readl(RX_DMA_ENH);
reg |= (1 << 1);
reg |= RX_DMA_INT_ENABLE;
nuport_mac_writel(reg, RX_DMA_ENH);
}

Expand Down Expand Up @@ -363,9 +395,9 @@ static void nuport_mac_adjust_link(struct net_device *dev)
if (phydev->link & (priv->old_duplex != phydev->duplex)) {
reg = nuport_mac_readl(CTRL_REG);
if (phydev->duplex == DUPLEX_FULL)
reg |= (1 << 20);
reg |= DUPLEX_FULL;
else
reg &= ~(1 << 20);
reg &= ~DUPLEX_FULL;
nuport_mac_writel(reg, CTRL_REG);

status_changed = 1;
Expand All @@ -392,14 +424,14 @@ static irqreturn_t nuport_mac_link_interrupt(int irq, void *dev_id)
u8 phy_addr;

reg = nuport_mac_readl(LINK_INT_CSR);
phy_addr = (reg >> 1) & 0x0f;
phy_addr = (reg >> LINK_PHY_ADDR_SHIFT) & (PHY_MAX_ADDR - 1);

if (phy_addr != priv->phydev->addr) {
netdev_err(dev, "spurious PHY irq (phy: %d)\n", phy_addr);
return IRQ_NONE;
}

priv->phydev->link = (reg & (1 << 16));
priv->phydev->link = (reg & LINK_UP);
nuport_mac_adjust_link(dev);

return IRQ_HANDLED;
Expand All @@ -417,7 +449,7 @@ static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
spin_lock_irqsave(&priv->lock, flags);
/* clear status word available if ready */
reg = nuport_mac_readl(TX_START_DMA);
if (reg & (1 << 18)) {
if (reg & TX_DMA_STATUS_AVAIL) {
nuport_mac_writel(reg, TX_START_DMA);
reg = nuport_mac_readl(TX_DMA_STATUS);

Expand Down Expand Up @@ -690,6 +722,7 @@ static int nuport_mac_open(struct net_device *dev)
int ret;
struct nuport_mac_priv *priv = netdev_priv(dev);
unsigned long flags;
u32 reg = 0;

ret = clk_enable(priv->emac_clk);
if (ret) {
Expand All @@ -698,7 +731,10 @@ static int nuport_mac_open(struct net_device *dev)
}

/* Set MAC into full duplex mode by default */
nuport_mac_writel(0x1010052C, CTRL_REG);
reg |= RX_ENABLE | TX_ENABLE;
reg |= DEFER_CHECK | STRIP_PAD | DRTRY_DISABLE;
reg |= FULL_DUPLEX | HBD_DISABLE;
nuport_mac_writel(reg, CTRL_REG);

/* set mac address in hardware in case it was not already */
nuport_mac_change_mac_address(dev, dev->dev_addr);
Expand All @@ -712,10 +748,16 @@ static int nuport_mac_open(struct net_device *dev)

phy_start(priv->phydev);

/* Enable link interrupt monitoring */
/* Enable link interrupt monitoring for our PHY address */
reg = LINK_INT_EN | (priv->phydev->addr << LINK_PHY_ADDR_SHIFT);
/* MII_BMSR register to be watched */
reg |= (1 << LINK_PHY_REG_SHIFT);
/* BMSR_STATUS to be watched in particular */
reg |= (2 << LINK_BIT_UP_SHIFT);

spin_lock_irqsave(&priv->lock, flags);
nuport_mac_writel(0x1041 | (priv->phydev->addr << 1), LINK_INT_CSR);
nuport_mac_writel(0xFFFFF, LINK_INT_POLL_TIME);
nuport_mac_writel(reg, LINK_INT_CSR);
nuport_mac_writel(LINK_POLL_MASK, LINK_INT_POLL_TIME);
spin_unlock_irqrestore(&priv->lock, flags);

ret = request_irq(priv->tx_irq, &nuport_mac_tx_interrupt,
Expand Down Expand Up @@ -771,8 +813,9 @@ static int nuport_mac_close(struct net_device *dev)
netif_stop_queue(dev);

free_irq(priv->link_irq, dev);
nuport_mac_writel(0x00, LINK_INT_CSR);
nuport_mac_writel(0x00, LINK_INT_POLL_TIME);
/* disable PHY polling */
nuport_mac_writel(0, LINK_INT_CSR);
nuport_mac_writel(0, LINK_INT_POLL_TIME);
phy_stop(priv->phydev);

free_irq(priv->tx_irq, dev);
Expand Down

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