[SUNGEM]: Unbreak Sun GEM chips.

Revert: 40727198

These PHY changes hang the sungem driver on startup with Sun chips on
sparc64.  Hopefully we can redo these changes in a way that doesn't
break non-Apple systems.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/powerpc/platforms/powermac/feature.c

@@ -910,18 +910,16 @@ core99_gmac_phy_reset(struct device_node *node, long param, long value)
 	    macio->type != macio_intrepid)
 		return -ENODEV;
 
-	printk(KERN_DEBUG "Hard reset of PHY chip ...\n");
-
 	LOCK(flags);
 	MACIO_OUT8(KL_GPIO_ETH_PHY_RESET, KEYLARGO_GPIO_OUTPUT_ENABLE);
 	(void)MACIO_IN8(KL_GPIO_ETH_PHY_RESET);
 	UNLOCK(flags);
-	msleep(10);
+	mdelay(10);
 	LOCK(flags);
 	MACIO_OUT8(KL_GPIO_ETH_PHY_RESET, /*KEYLARGO_GPIO_OUTPUT_ENABLE | */
 		KEYLARGO_GPIO_OUTOUT_DATA);
 	UNLOCK(flags);
-	msleep(10);
+	mdelay(10);
 
 	return 0;
 }

drivers/net/sungem.c

@@ -1653,40 +1653,36 @@ static void gem_init_rings(struct gem *gp)
 /* Init PHY interface and start link poll state machine */
 static void gem_init_phy(struct gem *gp)
 {
-	u32 mif_cfg;
+	u32 mifcfg;
 
 	/* Revert MIF CFG setting done on stop_phy */
-	mif_cfg = readl(gp->regs + MIF_CFG);
-	mif_cfg &= ~(MIF_CFG_PSELECT|MIF_CFG_POLL|MIF_CFG_BBMODE|MIF_CFG_MDI1);
-	mif_cfg |= MIF_CFG_MDI0;
-	writel(mif_cfg, gp->regs + MIF_CFG);
-	writel(PCS_DMODE_MGM, gp->regs + PCS_DMODE);
-	writel(MAC_XIFCFG_OE, gp->regs + MAC_XIFCFG);
+	mifcfg = readl(gp->regs + MIF_CFG);
+	mifcfg &= ~MIF_CFG_BBMODE;
+	writel(mifcfg, gp->regs + MIF_CFG);
 	
 	if (gp->pdev->vendor == PCI_VENDOR_ID_APPLE) {
 		int i;
-		u16 ctrl;
 
+		/* Those delay sucks, the HW seem to love them though, I'll
+		 * serisouly consider breaking some locks here to be able
+		 * to schedule instead
+		 */
+		for (i = 0; i < 3; i++) {
 #ifdef CONFIG_PPC_PMAC
-		pmac_call_feature(PMAC_FTR_GMAC_PHY_RESET, gp->of_node, 0, 0);
+			pmac_call_feature(PMAC_FTR_GMAC_PHY_RESET, gp->of_node, 0, 0);
+			msleep(20);
 #endif
-
-		/* Some PHYs used by apple have problem getting back
-		 * to us, we do an additional reset here
-		 */
-		phy_write(gp, MII_BMCR, BMCR_RESET);
-		for (i = 0; i < 50; i++) {
-			if ((phy_read(gp, MII_BMCR) & BMCR_RESET) == 0)
+			/* Some PHYs used by apple have problem getting back to us,
+			 * we do an additional reset here
+			 */
+			phy_write(gp, MII_BMCR, BMCR_RESET);
+			msleep(20);
+			if (phy_read(gp, MII_BMCR) != 0xffff)
 				break;
-			msleep(10);
+			if (i == 2)
+				printk(KERN_WARNING "%s: GMAC PHY not responding !\n",
+				       gp->dev->name);
 		}
-		if (i == 50)
-			printk(KERN_WARNING "%s: GMAC PHY not responding !\n",
-			       gp->dev->name);
-		/* Make sure isolate is off */
-		ctrl = phy_read(gp, MII_BMCR);
-		if (ctrl & BMCR_ISOLATE)
-			phy_write(gp, MII_BMCR, ctrl & ~BMCR_ISOLATE);
 	}
 
 	if (gp->pdev->vendor == PCI_VENDOR_ID_SUN &&
@@ -2123,7 +2119,7 @@ static void gem_reinit_chip(struct gem *gp)
 /* Must be invoked with no lock held. */
 static void gem_stop_phy(struct gem *gp, int wol)
 {
-	u32 mif_cfg;
+	u32 mifcfg;
 	unsigned long flags;
 
 	/* Let the chip settle down a bit, it seems that helps
@@ -2134,9 +2130,9 @@ static void gem_stop_phy(struct gem *gp, int wol)
 	/* Make sure we aren't polling PHY status change. We
 	 * don't currently use that feature though
 	 */
-	mif_cfg = readl(gp->regs + MIF_CFG);
-	mif_cfg &= ~MIF_CFG_POLL;
-	writel(mif_cfg, gp->regs + MIF_CFG);
+	mifcfg = readl(gp->regs + MIF_CFG);
+	mifcfg &= ~MIF_CFG_POLL;
+	writel(mifcfg, gp->regs + MIF_CFG);
 
 	if (wol && gp->has_wol) {
 		unsigned char *e = &gp->dev->dev_addr[0];
@@ -2186,8 +2182,7 @@ static void gem_stop_phy(struct gem *gp, int wol)
 		/* According to Apple, we must set the MDIO pins to this begnign
 		 * state or we may 1) eat more current, 2) damage some PHYs
 		 */
-		mif_cfg = 0;
-		writel(mif_cfg | MIF_CFG_BBMODE, gp->regs + MIF_CFG);
+		writel(mifcfg | MIF_CFG_BBMODE, gp->regs + MIF_CFG);
 		writel(0, gp->regs + MIF_BBCLK);
 		writel(0, gp->regs + MIF_BBDATA);
 		writel(0, gp->regs + MIF_BBOENAB);