net: dsa: bcm_sf2: implement GPHY power down

Implement the power on/off recommended procedure for the Single GPHY we
have on our Starfighter 2 switch. In order to make sure we get proper
LED link/activity signaling during suspend, switch the link indication
from the Switch/MAC to the PHY.

Finally, since the GPHY needs to be reset to be put in low power mode,
we will loose any context applied to it: workarounds, EEE etc.. so we
need to call phy_init_hw() to get our fixups re-applied successfully.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 45c0e2b..4daffb2 100644 (file)
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -238,17 +238,28 @@ static void bcm_sf2_gphy_enable_set(struct dsa_switch *ds, bool enable)
        struct bcm_sf2_priv *priv = ds_to_priv(ds);
        u32 reg;
 
-       if (!enable)
-               return;
-
-       reg = reg_readl(priv, REG_SPHY_CNTRL);
-       reg |= PHY_RESET;
-       reg &= ~(EXT_PWR_DOWN | IDDQ_BIAS);
-       reg_writel(priv, reg, REG_SPHY_CNTRL);
-       udelay(21);
        reg = reg_readl(priv, REG_SPHY_CNTRL);
-       reg &= ~PHY_RESET;
+       if (enable) {
+               reg |= PHY_RESET;
+               reg &= ~(EXT_PWR_DOWN | IDDQ_BIAS | CK25_DIS);
+               reg_writel(priv, reg, REG_SPHY_CNTRL);
+               udelay(21);
+               reg = reg_readl(priv, REG_SPHY_CNTRL);
+               reg &= ~PHY_RESET;
+       } else {
+               reg |= EXT_PWR_DOWN | IDDQ_BIAS | PHY_RESET;
+               reg_writel(priv, reg, REG_SPHY_CNTRL);
+               mdelay(1);
+               reg |= CK25_DIS;
+       }
        reg_writel(priv, reg, REG_SPHY_CNTRL);
+
+       /* Use PHY-driven LED signaling */
+       if (!enable) {
+               reg = reg_readl(priv, REG_LED_CNTRL(0));
+               reg |= SPDLNK_SRC_SEL;
+               reg_writel(priv, reg, REG_LED_CNTRL(0));
+       }
 }
 
 static int bcm_sf2_port_setup(struct dsa_switch *ds, int port,
@@ -266,6 +277,24 @@ static int bcm_sf2_port_setup(struct dsa_switch *ds, int port,
        /* Clear the Rx and Tx disable bits and set to no spanning tree */
        core_writel(priv, 0, CORE_G_PCTL_PORT(port));
 
+       /* Re-enable the GPHY and re-apply workarounds */
+       if (port == 0 && priv->hw_params.num_gphy == 1) {
+               bcm_sf2_gphy_enable_set(ds, true);
+               if (phy) {
+                       /* if phy_stop() has been called before, phy
+                        * will be in halted state, and phy_start()
+                        * will call resume.
+                        *
+                        * the resume path does not configure back
+                        * autoneg settings, and since we hard reset
+                        * the phy manually here, we need to reset the
+                        * state machine also.
+                        */
+                       phy->state = PHY_READY;
+                       phy_init_hw(phy);
+               }
+       }
+
        /* Enable port 7 interrupts to get notified */
        if (port == 7)
                intrl2_1_mask_clear(priv, P_IRQ_MASK(P7_IRQ_OFF));
@@ -299,6 +328,9 @@ static void bcm_sf2_port_disable(struct dsa_switch *ds, int port,
                intrl2_1_writel(priv, P_IRQ_MASK(P7_IRQ_OFF), INTRL2_CPU_CLEAR);
        }
 
+       if (port == 0 && priv->hw_params.num_gphy == 1)
+               bcm_sf2_gphy_enable_set(ds, false);
+
        if (dsa_is_cpu_port(ds, port))
                off = CORE_IMP_CTL;
        else

diff --git a/drivers/net/dsa/bcm_sf2_regs.h b/drivers/net/dsa/bcm_sf2_regs.h
index 1bb49cb..cabdfa5 100644 (file)
--- a/drivers/net/dsa/bcm_sf2_regs.h
+++ b/drivers/net/dsa/bcm_sf2_regs.h
@@ -61,6 +61,10 @@
 #define  LPI_COUNT_SHIFT               9
 #define  LPI_COUNT_MASK                        0x3F
 
+#define REG_LED_CNTRL_BASE             0x90
+#define REG_LED_CNTRL(x)               (REG_LED_CNTRL_BASE + (x) * 4)
+#define  SPDLNK_SRC_SEL                        (1 << 24)
+
 /* Register set relative to 'INTRL2_0' and 'INTRL2_1' */
 #define INTRL2_CPU_STATUS              0x00
 #define INTRL2_CPU_SET                 0x04