ibm_newemac: Add support for GPCS, SGMII and M88E1112 PHY

Add support for the phy types found on the Arches and other
PowerPC 460 based boards.
Signed-off-by: Victor Gallardo <vgallardo@amcc.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

arch/powerpc/include/asm/dcr-regs.h

@@ -75,6 +75,10 @@
 #define ICINTSTAT_ICTX1 0x20000000
 #define ICINTSTAT_ICTX	0x60000000
 
+/* SDRs (460EX/460GT) */
+#define SDR0_ETH_CFG		0x4103
+#define SDR0_ETH_CFG_ECS	0x00000100	/* EMAC int clk source */
+
 /*
  * All those DCR register addresses are offsets from the base address
  * for the SRAM0 controller (e.g. 0x20 on 440GX). The base address is

drivers/net/ibm_newemac/core.c

@@ -130,6 +130,7 @@ static inline void emac_report_timeout_error(struct emac_instance *dev,
 					     const char *error)
 {
 	if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
+				  EMAC_FTR_460EX_PHY_CLK_FIX |
 				  EMAC_FTR_440EP_PHY_CLK_FIX))
 		DBG(dev, "%s" NL, error);
 	else if (net_ratelimit())
@@ -201,13 +202,15 @@ static inline int emac_phy_supports_gige(int phy_mode)
 {
 	return  phy_mode == PHY_MODE_GMII ||
 		phy_mode == PHY_MODE_RGMII ||
+		phy_mode == PHY_MODE_SGMII ||
 		phy_mode == PHY_MODE_TBI ||
 		phy_mode == PHY_MODE_RTBI;
 }
 
 static inline int emac_phy_gpcs(int phy_mode)
 {
-	return  phy_mode == PHY_MODE_TBI ||
+	return  phy_mode == PHY_MODE_SGMII ||
+		phy_mode == PHY_MODE_TBI ||
 		phy_mode == PHY_MODE_RTBI;
 }
 
@@ -351,10 +354,24 @@ static int emac_reset(struct emac_instance *dev)
 		emac_tx_disable(dev);
 	}
 
+#ifdef CONFIG_PPC_DCR_NATIVE
+	/* Enable internal clock source */
+	if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
+		dcri_clrset(SDR0, SDR0_ETH_CFG,
+			    0, SDR0_ETH_CFG_ECS << dev->cell_index);
+#endif
+
 	out_be32(&p->mr0, EMAC_MR0_SRST);
 	while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
 		--n;
 
+#ifdef CONFIG_PPC_DCR_NATIVE
+	 /* Enable external clock source */
+	if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
+		dcri_clrset(SDR0, SDR0_ETH_CFG,
+			    SDR0_ETH_CFG_ECS << dev->cell_index, 0);
+#endif
+
 	if (n) {
 		dev->reset_failed = 0;
 		return 0;
@@ -547,8 +564,9 @@ static int emac_configure(struct emac_instance *dev)
 	switch (dev->phy.speed) {
 	case SPEED_1000:
 		if (emac_phy_gpcs(dev->phy.mode)) {
-			mr1 |= EMAC_MR1_MF_1000GPCS |
-				EMAC_MR1_MF_IPPA(dev->phy.address);
+			mr1 |= EMAC_MR1_MF_1000GPCS | EMAC_MR1_MF_IPPA(
+				(dev->phy.gpcs_address != 0xffffffff) ?
+				 dev->phy.gpcs_address : dev->phy.address);
 
 			/* Put some arbitrary OUI, Manuf & Rev IDs so we can
 			 * identify this GPCS PHY later.
@@ -660,8 +678,12 @@ static int emac_configure(struct emac_instance *dev)
 	out_be32(&p->iser,  r);
 
 	/* We need to take GPCS PHY out of isolate mode after EMAC reset */
-	if (emac_phy_gpcs(dev->phy.mode))
-		emac_mii_reset_phy(&dev->phy);
+	if (emac_phy_gpcs(dev->phy.mode)) {
+		if (dev->phy.gpcs_address != 0xffffffff)
+			emac_mii_reset_gpcs(&dev->phy);
+		else
+			emac_mii_reset_phy(&dev->phy);
+	}
 
 	return 0;
 }
@@ -866,7 +888,9 @@ static int emac_mdio_read(struct net_device *ndev, int id, int reg)
 	struct emac_instance *dev = netdev_priv(ndev);
 	int res;
 
-	res = __emac_mdio_read(dev->mdio_instance ? dev->mdio_instance : dev,
+	res = __emac_mdio_read((dev->mdio_instance &&
+				dev->phy.gpcs_address != id) ?
+				dev->mdio_instance : dev,
 			       (u8) id, (u8) reg);
 	return res;
 }
@@ -875,7 +899,9 @@ static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
 {
 	struct emac_instance *dev = netdev_priv(ndev);
 
-	__emac_mdio_write(dev->mdio_instance ? dev->mdio_instance : dev,
+	__emac_mdio_write((dev->mdio_instance &&
+			   dev->phy.gpcs_address != id) ?
+			   dev->mdio_instance : dev,
 			  (u8) id, (u8) reg, (u16) val);
 }
 
@@ -2367,7 +2393,11 @@ static int __devinit emac_init_phy(struct emac_instance *dev)
 		 * XXX I probably should move these settings to the dev tree
 		 */
 		dev->phy.address = -1;
-		dev->phy.features = SUPPORTED_100baseT_Full | SUPPORTED_MII;
+		dev->phy.features = SUPPORTED_MII;
+		if (emac_phy_supports_gige(dev->phy_mode))
+			dev->phy.features |= SUPPORTED_1000baseT_Full;
+		else
+			dev->phy.features |= SUPPORTED_100baseT_Full;
 		dev->phy.pause = 1;
 
 		return 0;
@@ -2406,7 +2436,9 @@ static int __devinit emac_init_phy(struct emac_instance *dev)
 		 * Note that the busy_phy_map is currently global
 		 * while it should probably be per-ASIC...
 		 */
-		dev->phy.address = dev->cell_index;
+		dev->phy.gpcs_address = dev->gpcs_address;
+		if (dev->phy.gpcs_address == 0xffffffff)
+			dev->phy.address = dev->cell_index;
 	}
 
 	emac_configure(dev);
@@ -2516,6 +2548,8 @@ static int __devinit emac_init_config(struct emac_instance *dev)
 		dev->phy_address = 0xffffffff;
 	if (emac_read_uint_prop(np, "phy-map", &dev->phy_map, 0))
 		dev->phy_map = 0xffffffff;
+	if (emac_read_uint_prop(np, "gpcs-address", &dev->gpcs_address, 0))
+		dev->gpcs_address = 0xffffffff;
 	if (emac_read_uint_prop(np->parent, "clock-frequency", &dev->opb_bus_freq, 1))
 		return -ENXIO;
 	if (emac_read_uint_prop(np, "tah-device", &dev->tah_ph, 0))
@@ -2559,6 +2593,9 @@ static int __devinit emac_init_config(struct emac_instance *dev)
 	/* Check EMAC version */
 	if (of_device_is_compatible(np, "ibm,emac4sync")) {
 		dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
+		if (of_device_is_compatible(np, "ibm,emac-460ex") ||
+		    of_device_is_compatible(np, "ibm,emac-460gt"))
+			dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
 	} else if (of_device_is_compatible(np, "ibm,emac4")) {
 		dev->features |= EMAC_FTR_EMAC4;
 		if (of_device_is_compatible(np, "ibm,emac-440gx"))
@@ -2826,6 +2863,9 @@ static int __devinit emac_probe(struct of_device *ofdev,
 	       ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
 	       ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
 
+	if (dev->phy_mode == PHY_MODE_SGMII)
+		printk(KERN_NOTICE "%s: in SGMII mode\n", ndev->name);
+
 	if (dev->phy.address >= 0)
 		printk("%s: found %s PHY (0x%02x)\n", ndev->name,
 		       dev->phy.def->name, dev->phy.address);

drivers/net/ibm_newemac/core.h

@@ -190,6 +190,9 @@ struct emac_instance {
 	struct delayed_work		link_work;
 	int				link_polling;
 
+	/* GPCS PHY infos */
+	u32				gpcs_address;
+
 	/* Shared MDIO if any */
 	u32				mdio_ph;
 	struct of_device		*mdio_dev;
@@ -317,6 +320,10 @@ struct emac_instance {
  * The 405EX and 460EX contain the EMAC4SYNC core
  */
 #define EMAC_FTR_EMAC4SYNC		0x00000200
+/*
+ * Set if we need phy clock workaround for 460ex or 460gt
+ */
+#define EMAC_FTR_460EX_PHY_CLK_FIX	0x00000400
 
 
 /* Right now, we don't quite handle the always/possible masks on the
@@ -344,6 +351,7 @@ enum {
 #ifdef CONFIG_IBM_NEW_EMAC_NO_FLOW_CTRL
 	    EMAC_FTR_NO_FLOW_CONTROL_40x |
 #endif
+	EMAC_FTR_460EX_PHY_CLK_FIX |
 	EMAC_FTR_440EP_PHY_CLK_FIX,
 };
 

drivers/net/ibm_newemac/phy.c

@@ -38,6 +38,16 @@ static inline void phy_write(struct mii_phy *phy, int reg, int val)
 	phy->mdio_write(phy->dev, phy->address, reg, val);
 }
 
+static inline int gpcs_phy_read(struct mii_phy *phy, int reg)
+{
+	return phy->mdio_read(phy->dev, phy->gpcs_address, reg);
+}
+
+static inline void gpcs_phy_write(struct mii_phy *phy, int reg, int val)
+{
+	phy->mdio_write(phy->dev, phy->gpcs_address, reg, val);
+}
+
 int emac_mii_reset_phy(struct mii_phy *phy)
 {
 	int val;
@@ -62,6 +72,37 @@ int emac_mii_reset_phy(struct mii_phy *phy)
 	return limit <= 0;
 }
 
+int emac_mii_reset_gpcs(struct mii_phy *phy)
+{
+	int val;
+	int limit = 10000;
+
+	val = gpcs_phy_read(phy, MII_BMCR);
+	val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
+	val |= BMCR_RESET;
+	gpcs_phy_write(phy, MII_BMCR, val);
+
+	udelay(300);
+
+	while (limit--) {
+		val = gpcs_phy_read(phy, MII_BMCR);
+		if (val >= 0 && (val & BMCR_RESET) == 0)
+			break;
+		udelay(10);
+	}
+	if ((val & BMCR_ISOLATE) && limit > 0)
+		gpcs_phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
+
+	if (limit > 0 && phy->mode == PHY_MODE_SGMII) {
+		/* Configure GPCS interface to recommended setting for SGMII */
+		gpcs_phy_write(phy, 0x04, 0x8120); /* AsymPause, FDX */
+		gpcs_phy_write(phy, 0x07, 0x2801); /* msg_pg, toggle */
+		gpcs_phy_write(phy, 0x00, 0x0140); /* 1Gbps, FDX     */
+	}
+
+	return limit <= 0;
+}
+
 static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
 {
 	int ctl, adv;
@@ -332,6 +373,33 @@ static int m88e1111_init(struct mii_phy *phy)
 	return  0;
 }
 
+static int m88e1112_init(struct mii_phy *phy)
+{
+	/*
+	 * Marvell 88E1112 PHY needs to have the SGMII MAC
+	 * interace (page 2) properly configured to
+	 * communicate with the 460EX/GT GPCS interface.
+	 */
+
+	u16 reg_short;
+
+	pr_debug("%s: Marvell 88E1112 Ethernet\n", __func__);
+
+	/* Set access to Page 2 */
+	phy_write(phy, 0x16, 0x0002);
+
+	phy_write(phy, 0x00, 0x0040); /* 1Gbps */
+	reg_short = (u16)(phy_read(phy, 0x1a));
+	reg_short |= 0x8000; /* bypass Auto-Negotiation */
+	phy_write(phy, 0x1a, reg_short);
+	emac_mii_reset_phy(phy); /* reset MAC interface */
+
+	/* Reset access to Page 0 */
+	phy_write(phy, 0x16, 0x0000);
+
+	return  0;
+}
+
 static int et1011c_init(struct mii_phy *phy)
 {
 	u16 reg_short;
@@ -384,11 +452,27 @@ static struct mii_phy_def m88e1111_phy_def = {
 	.ops		= &m88e1111_phy_ops,
 };
 
+static struct mii_phy_ops m88e1112_phy_ops = {
+	.init		= m88e1112_init,
+	.setup_aneg	= genmii_setup_aneg,
+	.setup_forced	= genmii_setup_forced,
+	.poll_link	= genmii_poll_link,
+	.read_link	= genmii_read_link
+};
+
+static struct mii_phy_def m88e1112_phy_def = {
+	.phy_id		= 0x01410C90,
+	.phy_id_mask	= 0x0ffffff0,
+	.name		= "Marvell 88E1112 Ethernet",
+	.ops		= &m88e1112_phy_ops,
+};
+
 static struct mii_phy_def *mii_phy_table[] = {
 	&et1011c_phy_def,
 	&cis8201_phy_def,
 	&bcm5248_phy_def,
 	&m88e1111_phy_def,
+	&m88e1112_phy_def,
 	&genmii_phy_def,
 	NULL
 };

drivers/net/ibm_newemac/phy.h

@@ -57,6 +57,7 @@ struct mii_phy {
 				   or determined automaticaly */
 	int address;		/* PHY address */
 	int mode;		/* PHY mode */
+	int gpcs_address;	/* GPCS PHY address */
 
 	/* 1: autoneg enabled, 0: disabled */
 	int autoneg;
@@ -81,5 +82,6 @@ struct mii_phy {
  */
 int emac_mii_phy_probe(struct mii_phy *phy, int address);
 int emac_mii_reset_phy(struct mii_phy *phy);
+int emac_mii_reset_gpcs(struct mii_phy *phy);
 
 #endif /* __IBM_NEWEMAC_PHY_H */