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path: root/drivers/net/davinci_emac.c
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Diffstat (limited to 'drivers/net/davinci_emac.c')
-rw-r--r--drivers/net/davinci_emac.c133
1 files changed, 131 insertions, 2 deletions
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 25e14d2da755..28633761be21 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -298,6 +298,11 @@ static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
#define EMAC_CTRL_EWCTL (0x4)
#define EMAC_CTRL_EWINTTCNT (0x8)
+/* EMAC DM644x control module masks */
+#define EMAC_DM644X_EWINTCNT_MASK 0x1FFFF
+#define EMAC_DM644X_INTMIN_INTVL 0x1
+#define EMAC_DM644X_INTMAX_INTVL (EMAC_DM644X_EWINTCNT_MASK)
+
/* EMAC MDIO related */
/* Mask & Control defines */
#define MDIO_CONTROL_CLKDIV (0xFF)
@@ -318,8 +323,20 @@ static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
#define MDIO_CONTROL (0x04)
/* EMAC DM646X control module registers */
-#define EMAC_DM646X_CMRXINTEN (0x14)
-#define EMAC_DM646X_CMTXINTEN (0x18)
+#define EMAC_DM646X_CMINTCTRL 0x0C
+#define EMAC_DM646X_CMRXINTEN 0x14
+#define EMAC_DM646X_CMTXINTEN 0x18
+#define EMAC_DM646X_CMRXINTMAX 0x70
+#define EMAC_DM646X_CMTXINTMAX 0x74
+
+/* EMAC DM646X control module masks */
+#define EMAC_DM646X_INTPACEEN (0x3 << 16)
+#define EMAC_DM646X_INTPRESCALE_MASK (0x7FF << 0)
+#define EMAC_DM646X_CMINTMAX_CNT 63
+#define EMAC_DM646X_CMINTMIN_CNT 2
+#define EMAC_DM646X_CMINTMAX_INTVL (1000 / EMAC_DM646X_CMINTMIN_CNT)
+#define EMAC_DM646X_CMINTMIN_INTVL ((1000 / EMAC_DM646X_CMINTMAX_CNT) + 1)
+
/* EMAC EOI codes for C0 */
#define EMAC_DM646X_MAC_EOI_C0_RXEN (0x01)
@@ -468,6 +485,8 @@ struct emac_priv {
u32 duplex; /* Link duplex: 0=Half, 1=Full */
u32 rx_buf_size;
u32 isr_count;
+ u32 coal_intvl;
+ u32 bus_freq_mhz;
u8 rmii_en;
u8 version;
u32 mac_hash1;
@@ -691,6 +710,103 @@ static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
}
/**
+ * emac_get_coalesce : Get interrupt coalesce settings for this device
+ * @ndev : The DaVinci EMAC network adapter
+ * @coal : ethtool coalesce settings structure
+ *
+ * Fetch the current interrupt coalesce settings
+ *
+ */
+static int emac_get_coalesce(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct emac_priv *priv = netdev_priv(ndev);
+
+ coal->rx_coalesce_usecs = priv->coal_intvl;
+ return 0;
+
+}
+
+/**
+ * emac_set_coalesce : Set interrupt coalesce settings for this device
+ * @ndev : The DaVinci EMAC network adapter
+ * @coal : ethtool coalesce settings structure
+ *
+ * Set interrupt coalesce parameters
+ *
+ */
+static int emac_set_coalesce(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct emac_priv *priv = netdev_priv(ndev);
+ u32 int_ctrl, num_interrupts = 0;
+ u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0;
+
+ if (!coal->rx_coalesce_usecs)
+ return -EINVAL;
+
+ coal_intvl = coal->rx_coalesce_usecs;
+
+ switch (priv->version) {
+ case EMAC_VERSION_2:
+ int_ctrl = emac_ctrl_read(EMAC_DM646X_CMINTCTRL);
+ prescale = priv->bus_freq_mhz * 4;
+
+ if (coal_intvl < EMAC_DM646X_CMINTMIN_INTVL)
+ coal_intvl = EMAC_DM646X_CMINTMIN_INTVL;
+
+ if (coal_intvl > EMAC_DM646X_CMINTMAX_INTVL) {
+ /*
+ * Interrupt pacer works with 4us Pulse, we can
+ * throttle further by dilating the 4us pulse.
+ */
+ addnl_dvdr = EMAC_DM646X_INTPRESCALE_MASK / prescale;
+
+ if (addnl_dvdr > 1) {
+ prescale *= addnl_dvdr;
+ if (coal_intvl > (EMAC_DM646X_CMINTMAX_INTVL
+ * addnl_dvdr))
+ coal_intvl = (EMAC_DM646X_CMINTMAX_INTVL
+ * addnl_dvdr);
+ } else {
+ addnl_dvdr = 1;
+ coal_intvl = EMAC_DM646X_CMINTMAX_INTVL;
+ }
+ }
+
+ num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
+
+ int_ctrl |= EMAC_DM646X_INTPACEEN;
+ int_ctrl &= (~EMAC_DM646X_INTPRESCALE_MASK);
+ int_ctrl |= (prescale & EMAC_DM646X_INTPRESCALE_MASK);
+ emac_ctrl_write(EMAC_DM646X_CMINTCTRL, int_ctrl);
+
+ emac_ctrl_write(EMAC_DM646X_CMRXINTMAX, num_interrupts);
+ emac_ctrl_write(EMAC_DM646X_CMTXINTMAX, num_interrupts);
+
+ break;
+ default:
+ int_ctrl = emac_ctrl_read(EMAC_CTRL_EWINTTCNT);
+ int_ctrl &= (~EMAC_DM644X_EWINTCNT_MASK);
+ prescale = coal_intvl * priv->bus_freq_mhz;
+ if (prescale > EMAC_DM644X_EWINTCNT_MASK) {
+ prescale = EMAC_DM644X_EWINTCNT_MASK;
+ coal_intvl = prescale / priv->bus_freq_mhz;
+ }
+ emac_ctrl_write(EMAC_CTRL_EWINTTCNT, (int_ctrl | prescale));
+
+ break;
+ }
+
+ printk(KERN_INFO"Set coalesce to %d usecs.\n", coal_intvl);
+ priv->coal_intvl = coal_intvl;
+
+ return 0;
+
+}
+
+
+/**
* ethtool_ops: DaVinci EMAC Ethtool structure
*
* Ethtool support for EMAC adapter
@@ -701,6 +817,8 @@ static const struct ethtool_ops ethtool_ops = {
.get_settings = emac_get_settings,
.set_settings = emac_set_settings,
.get_link = ethtool_op_get_link,
+ .get_coalesce = emac_get_coalesce,
+ .set_coalesce = emac_set_coalesce,
};
/**
@@ -2437,6 +2555,14 @@ static int emac_dev_open(struct net_device *ndev)
/* Start/Enable EMAC hardware */
emac_hw_enable(priv);
+ /* Enable Interrupt pacing if configured */
+ if (priv->coal_intvl != 0) {
+ struct ethtool_coalesce coal;
+
+ coal.rx_coalesce_usecs = (priv->coal_intvl << 4);
+ emac_set_coalesce(ndev, &coal);
+ }
+
/* find the first phy */
priv->phydev = NULL;
if (priv->phy_mask) {
@@ -2677,6 +2803,9 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
priv->int_enable = pdata->interrupt_enable;
priv->int_disable = pdata->interrupt_disable;
+ priv->coal_intvl = 0;
+ priv->bus_freq_mhz = (u32)(emac_bus_frequency / 1000000);
+
emac_dev = &ndev->dev;
/* Get EMAC platform data */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);