diff options
| -rw-r--r-- | drivers/net/davinci_emac.c | 133 |
1 files changed, 131 insertions, 2 deletions
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c index 25e14d2da75..28633761be2 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); |