tg3: Add EEE support

This patch adds Energy Efficient Ethernet (EEE) support for the 5718
device ID and the 57765 B0 asic revision.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index afcc593108ce..f2d96ddd464e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -1584,6 +1584,17 @@ static void tg3_phy_fini(struct tg3 *tp)
 	}
 }
 
+static int tg3_phydsp_read(struct tg3 *tp, u32 reg, u32 *val)
+{
+	int err;
+
+	err = tg3_writephy(tp, MII_TG3_DSP_ADDRESS, reg);
+	if (!err)
+		err = tg3_readphy(tp, MII_TG3_DSP_RW_PORT, val);
+
+	return err;
+}
+
 static int tg3_phydsp_write(struct tg3 *tp, u32 reg, u32 val)
 {
 	int err;
@@ -1747,6 +1758,42 @@ static void tg3_phy_apply_otp(struct tg3 *tp)
 	tg3_writephy(tp, MII_TG3_AUX_CTRL, phy);
 }
 
+static void tg3_phy_eee_adjust(struct tg3 *tp, u32 current_link_up)
+{
+	u32 val;
+
+	if (!(tp->phy_flags & TG3_PHYFLG_EEE_CAP))
+		return;
+
+	tp->setlpicnt = 0;
+
+	if (tp->link_config.autoneg == AUTONEG_ENABLE &&
+	    current_link_up == 1 &&
+	    (tp->link_config.active_speed == SPEED_1000 ||
+	     (tp->link_config.active_speed == SPEED_100 &&
+	      tp->link_config.active_duplex == DUPLEX_FULL))) {
+		u32 eeectl;
+
+		if (tp->link_config.active_speed == SPEED_1000)
+			eeectl = TG3_CPMU_EEE_CTRL_EXIT_16_5_US;
+		else
+			eeectl = TG3_CPMU_EEE_CTRL_EXIT_36_US;
+
+		tw32(TG3_CPMU_EEE_CTRL, eeectl);
+
+		tg3_phy_cl45_read(tp, 0x7, TG3_CL45_D7_EEERES_STAT, &val);
+
+		if (val == TG3_CL45_D7_EEERES_STAT_LP_1000T ||
+		    val == TG3_CL45_D7_EEERES_STAT_LP_100TX)
+			tp->setlpicnt = 2;
+	}
+
+	if (!tp->setlpicnt) {
+		val = tr32(TG3_CPMU_EEE_MODE);
+		tw32(TG3_CPMU_EEE_MODE, val & ~TG3_CPMU_EEEMD_LPI_ENABLE);
+	}
+}
+
 static int tg3_wait_macro_done(struct tg3 *tp)
 {
 	int limit = 100;
@@ -2921,6 +2968,44 @@ static void tg3_phy_copper_begin(struct tg3 *tp)
 		tg3_writephy(tp, MII_TG3_CTRL, new_adv);
 	}
 
+	if (tp->phy_flags & TG3_PHYFLG_EEE_CAP) {
+		u32 val = 0;
+
+		tw32(TG3_CPMU_EEE_MODE,
+		     tr32(TG3_CPMU_EEE_MODE) & ~TG3_CPMU_EEEMD_LPI_ENABLE);
+
+		/* Enable SM_DSP clock and tx 6dB coding. */
+		val = MII_TG3_AUXCTL_SHDWSEL_AUXCTL |
+		      MII_TG3_AUXCTL_ACTL_SMDSP_ENA |
+		      MII_TG3_AUXCTL_ACTL_TX_6DB;
+		tg3_writephy(tp, MII_TG3_AUX_CTRL, val);
+
+		if ((GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 ||
+		     GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57765) &&
+		    !tg3_phydsp_read(tp, MII_TG3_DSP_CH34TP2, &val))
+			tg3_phydsp_write(tp, MII_TG3_DSP_CH34TP2,
+					 val | MII_TG3_DSP_CH34TP2_HIBW01);
+
+		if (tp->link_config.autoneg == AUTONEG_ENABLE) {
+			/* Advertise 100-BaseTX EEE ability */
+			if (tp->link_config.advertising &
+			    (ADVERTISED_100baseT_Half |
+			     ADVERTISED_100baseT_Full))
+				val |= TG3_CL45_D7_EEEADV_CAP_100TX;
+			/* Advertise 1000-BaseT EEE ability */
+			if (tp->link_config.advertising &
+			    (ADVERTISED_1000baseT_Half |
+			     ADVERTISED_1000baseT_Full))
+				val |= TG3_CL45_D7_EEEADV_CAP_1000T;
+		}
+		tg3_phy_cl45_write(tp, 0x7, TG3_CL45_D7_EEEADV_CAP, val);
+
+		/* Turn off SM_DSP clock. */
+		val = MII_TG3_AUXCTL_SHDWSEL_AUXCTL |
+		      MII_TG3_AUXCTL_ACTL_TX_6DB;
+		tg3_writephy(tp, MII_TG3_AUX_CTRL, val);
+	}
+
 	if (tp->link_config.autoneg == AUTONEG_DISABLE &&
 	    tp->link_config.speed != SPEED_INVALID) {
 		u32 bmcr, orig_bmcr;
@@ -3282,6 +3367,8 @@ relink:
 	tw32_f(MAC_MODE, tp->mac_mode);
 	udelay(40);
 
+	tg3_phy_eee_adjust(tp, current_link_up);
+
 	if (tp->tg3_flags & TG3_FLAG_USE_LINKCHG_REG) {
 		/* Polled via timer. */
 		tw32_f(MAC_EVENT, 0);
@@ -7790,6 +7877,22 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
 		tw32(TG3_CPMU_LSPD_10MB_CLK, val);
 	}
 
+	/* Enable MAC control of LPI */
+	if (tp->phy_flags & TG3_PHYFLG_EEE_CAP) {
+		tw32_f(TG3_CPMU_EEE_LNKIDL_CTRL,
+		       TG3_CPMU_EEE_LNKIDL_PCIE_NL0 |
+		       TG3_CPMU_EEE_LNKIDL_UART_IDL);
+
+		tw32_f(TG3_CPMU_EEE_CTRL,
+		       TG3_CPMU_EEE_CTRL_EXIT_20_1_US);
+
+		tw32_f(TG3_CPMU_EEE_MODE,
+		       TG3_CPMU_EEEMD_ERLY_L1_XIT_DET |
+		       TG3_CPMU_EEEMD_LPI_IN_TX |
+		       TG3_CPMU_EEEMD_LPI_IN_RX |
+		       TG3_CPMU_EEEMD_EEE_ENABLE);
+	}
+
 	/* This works around an issue with Athlon chipsets on
 	 * B3 tigon3 silicon.  This bit has no effect on any
 	 * other revision.  But do not set this on PCI Express
@@ -8598,6 +8701,12 @@ static void tg3_timer(unsigned long __opaque)
 		if (tp->tg3_flags2 & TG3_FLG2_5705_PLUS)
 			tg3_periodic_fetch_stats(tp);
 
+		if (tp->setlpicnt && !--tp->setlpicnt) {
+			u32 val = tr32(TG3_CPMU_EEE_MODE);
+			tw32(TG3_CPMU_EEE_MODE,
+			     val | TG3_CPMU_EEEMD_LPI_ENABLE);
+		}
+
 		if (tp->tg3_flags & TG3_FLAG_USE_LINKCHG_REG) {
 			u32 mac_stat;
 			int phy_event;
@@ -12432,6 +12541,11 @@ static int __devinit tg3_phy_probe(struct tg3 *tp)
 		}
 	}
 
+	if (tp->pdev->device == TG3PCI_DEVICE_TIGON3_5718 ||
+	    (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57765 &&
+	     tp->pci_chip_rev_id != CHIPREV_ID_57765_A0))
+		tp->phy_flags |= TG3_PHYFLG_EEE_CAP;
+
 	if (!(tp->phy_flags & TG3_PHYFLG_ANY_SERDES) &&
 	    !(tp->tg3_flags3 & TG3_FLG3_ENABLE_APE) &&
 	    !(tp->tg3_flags & TG3_FLAG_ENABLE_ASF)) {