mv643xx_eth: convert to use the Marvell Orion MDIO driver

This patch converts the Marvell MV643XX ethernet driver to use the
Marvell Orion MDIO driver. As a result, PowerPC and ARM platforms
registering the Marvell MV643XX ethernet driver are also updated to
register a Marvell Orion MDIO driver. This driver voluntarily overlaps
with the Marvell Ethernet shared registers because it will use a subset
of this shared register (shared_base + 0x4 to shared_base + 0x84). The
Ethernet driver is also updated to look up for a PHY device using the
Orion MDIO bus driver.

For ARM and PowerPC we register a single instance of the "mvmdio" driver
in the system like it used to be done with the use of the "shared_smi"
platform_data cookie on ARM.

Note that it is safe to register the mvmdio driver only for the "ge00"
instance of the driver because this "ge00" interface is guaranteed to
always be explicitely registered by consumers of
arch/arm/plat-orion/common.c and other instances (ge01, ge10 and ge11)
were all pointing their shared_smi to ge00. For PowerPC the in-tree
Device Tree Source files mention only one MV643XX ethernet MAC instance
so the MDIO bus driver is registered only when id == 0.

Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/arm/plat-orion/common.c

···
 	struct mv643xx_eth_shared_platform_data *orion_ge_shared_data,
 	struct resource *orion_ge_resource, unsigned long irq,
 	struct platform_device *orion_ge_shared,
+	struct platform_device *orion_ge_mvmdio,
 	struct mv643xx_eth_platform_data *eth_data,
 	struct platform_device *orion_ge)
 {
···
 	orion_ge->dev.platform_data = eth_data;
 
 	platform_device_register(orion_ge_shared);
+	if (orion_ge_mvmdio)
+		platform_device_register(orion_ge_mvmdio);
 	platform_device_register(orion_ge);
 }
 
···
 static struct resource orion_ge00_shared_resources[] = {
 	{
 		.name	= "ge00 base",
-	}, {
-		.name	= "ge00 err irq",
 	},
 };
 
···
 	.dev		= {
 		.platform_data	= &orion_ge00_shared_data,
 	},
+};
+
+static struct resource orion_ge_mvmdio_resources[] = {
+	{
+		.name	= "ge00 mvmdio base",
+	}, {
+		.name	= "ge00 mvmdio err irq",
+	},
+};
+
+static struct platform_device orion_ge_mvmdio = {
+	.name		= "orion-mdio",
+	.id		= -1,
 };
 
 static struct resource orion_ge00_resources[] = {
···
 			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge00_shared, orion_ge00_shared_resources,
-		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+		       mapbase + 0x2000, SZ_16K - 1, NO_IRQ);
+	fill_resources(&orion_ge_mvmdio, orion_ge_mvmdio_resources,
+			mapbase + 0x2004, 0x84 - 1, irq_err);
 	orion_ge00_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge00_shared_data,
 		    orion_ge00_resources, irq, &orion_ge00_shared,
+		    &orion_ge_mvmdio,
 		    eth_data, &orion_ge00);
 }
 
 /*****************************************************************************
  * GE01
  ****************************************************************************/
-struct mv643xx_eth_shared_platform_data orion_ge01_shared_data = {
-	.shared_smi	= &orion_ge00_shared,
-};
+struct mv643xx_eth_shared_platform_data orion_ge01_shared_data;
 
 static struct resource orion_ge01_shared_resources[] = {
 	{
 		.name	= "ge01 base",
-	}, {
-		.name	= "ge01 err irq",
-	},
+	}
 };
 
 static struct platform_device orion_ge01_shared = {
···
 			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge01_shared, orion_ge01_shared_resources,
-		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+		       mapbase + 0x2000, SZ_16K - 1, NO_IRQ);
 	orion_ge01_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge01_shared_data,
 		    orion_ge01_resources, irq, &orion_ge01_shared,
+		    NULL,
 		    eth_data, &orion_ge01);
 }
 
 /*****************************************************************************
  * GE10
  ****************************************************************************/
-struct mv643xx_eth_shared_platform_data orion_ge10_shared_data = {
-	.shared_smi	= &orion_ge00_shared,
-};
+struct mv643xx_eth_shared_platform_data orion_ge10_shared_data;
 
 static struct resource orion_ge10_shared_resources[] = {
 	{
 		.name	= "ge10 base",
-	}, {
-		.name	= "ge10 err irq",
-	},
+	}
 };
 
 static struct platform_device orion_ge10_shared = {
···
 			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge10_shared, orion_ge10_shared_resources,
-		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+		       mapbase + 0x2000, SZ_16K - 1, NO_IRQ);
 	ge_complete(&orion_ge10_shared_data,
 		    orion_ge10_resources, irq, &orion_ge10_shared,
+		    NULL,
 		    eth_data, &orion_ge10);
 }
 
 /*****************************************************************************
  * GE11
  ****************************************************************************/
-struct mv643xx_eth_shared_platform_data orion_ge11_shared_data = {
-	.shared_smi	= &orion_ge00_shared,
-};
+struct mv643xx_eth_shared_platform_data orion_ge11_shared_data;
 
 static struct resource orion_ge11_shared_resources[] = {
 	{
 		.name	= "ge11 base",
-	}, {
-		.name	= "ge11 err irq",
 	},
 };
 
···
 			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge11_shared, orion_ge11_shared_resources,
-		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+		       mapbase + 0x2000, SZ_16K - 1, NO_IRQ);
 	ge_complete(&orion_ge11_shared_data,
 		    orion_ge11_resources, irq, &orion_ge11_shared,
+		    NULL,
 		    eth_data, &orion_ge11);
 }
 

arch/powerpc/platforms/chrp/pegasos_eth.c

···
 	.resource	= mv643xx_eth_shared_resources,
 };
 
+/*
+ * The orion mdio driver only covers shared + 0x4 up to shared + 0x84 - 1
+ */
+static struct resource mv643xx_eth_mvmdio_resources[] = {
+	[0] = {
+		.name	= "ethernet mdio base",
+		.start	= 0xf1000000 + MV643XX_ETH_SHARED_REGS + 0x4,
+		.end	= 0xf1000000 + MV643XX_ETH_SHARED_REGS + 0x83,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device mv643xx_eth_mvmdio_device = {
+	.name		= "orion-mdio",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(mv643xx_eth_mvmdio_resources),
+	.resource	= mv643xx_eth_shared_resources,
+};
+
 static struct resource mv643xx_eth_port1_resources[] = {
 	[0] = {
 		.name	= "eth port1 irq",
···
 
 static struct platform_device *mv643xx_eth_pd_devs[] __initdata = {
 	&mv643xx_eth_shared_device,
+	&mv643xx_eth_mvmdio_device,
 	&eth_port1_device,
 };
 

arch/powerpc/sysdev/mv64x60_dev.c

···
 						struct device_node *np, int id)
 {
 	struct platform_device *pdev;
-	struct resource r[1];
+	struct resource r[2];
 	int err;
 
 	err = of_address_to_resource(np, 0, &r[0]);
 	if (err)
 		return ERR_PTR(err);
 
+	/* register an orion mdio bus driver */
+	r[1].start = r[0].start + 0x4;
+	r[1].end = r[0].start + 0x84 - 1;
+	r[1].flags = IORESOURCE_MEM;
+
+	if (id == 0) {
+		pdev = platform_device_register_simple("orion-mdio", -1, &r[1], 1);
+		if (!pdev)
+			return pdev;
+	}
+
 	pdev = platform_device_register_simple(MV643XX_ETH_SHARED_NAME, id,
-					       r, 1);
+					       &r[0], 1);
+
 	return pdev;
 }
 

drivers/net/ethernet/marvell/Kconfig

···
 	depends on (MV64X60 || PPC32 || PLAT_ORION) && INET
 	select INET_LRO
 	select PHYLIB
+	select MVMDIO
 	---help---
 	  This driver supports the gigabit ethernet MACs in the
 	  Marvell Discovery PPC/MIPS chipset family (MV643XX) and
···
 	  interface units of the Marvell EBU SoCs (Kirkwood, Orion5x,
 	  Dove, Armada 370 and Armada XP).
 
-	  For now, this driver is only needed for the MVNETA driver
-	  (used on Armada 370 and XP), but it could be used in the
-	  future by the MV643XX_ETH driver.
+	  This driver is used by the MV643XX_ETH and MVNETA drivers.
 
 config MVNETA
 	tristate "Marvell Armada 370/XP network interface support"

drivers/net/ethernet/marvell/Makefile

···
 # Makefile for the Marvell device drivers.
 #
 
-obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
 obj-$(CONFIG_MVMDIO) += mvmdio.o
+obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
 obj-$(CONFIG_MVNETA) += mvneta.o
 obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
 obj-$(CONFIG_SKGE) += skge.o

drivers/net/ethernet/marvell/mv643xx_eth.c

···
  * Registers shared between all ports.
  */
 #define PHY_ADDR			0x0000
-#define SMI_REG				0x0004
-#define  SMI_BUSY			0x10000000
-#define  SMI_READ_VALID			0x08000000
-#define  SMI_OPCODE_READ		0x04000000
-#define  SMI_OPCODE_WRITE		0x00000000
-#define ERR_INT_CAUSE			0x0080
-#define  ERR_INT_SMI_DONE		0x00000010
-#define ERR_INT_MASK			0x0084
 #define WINDOW_BASE(w)			(0x0200 + ((w) << 3))
 #define WINDOW_SIZE(w)			(0x0204 + ((w) << 3))
 #define WINDOW_REMAP_HIGH(w)		(0x0280 + ((w) << 2))
···
 	 * Ethernet controller base address.
 	 */
 	void __iomem *base;
-
-	/*
-	 * Points at the right SMI instance to use.
-	 */
-	struct mv643xx_eth_shared_private *smi;
-
-	/*
-	 * Provides access to local SMI interface.
-	 */
-	struct mii_bus *smi_bus;
-
-	/*
-	 * If we have access to the error interrupt pin (which is
-	 * somewhat misnamed as it not only reflects internal errors
-	 * but also reflects SMI completion), use that to wait for
-	 * SMI access completion instead of polling the SMI busy bit.
-	 */
-	int err_interrupt;
-	wait_queue_head_t smi_busy_wait;
 
 	/*
 	 * Per-port MBUS window access register value.
···
 out_write:
 	wrlp(mp, PORT_SERIAL_CONTROL, pscr);
 }
-
-static irqreturn_t mv643xx_eth_err_irq(int irq, void *dev_id)
-{
-	struct mv643xx_eth_shared_private *msp = dev_id;
-
-	if (readl(msp->base + ERR_INT_CAUSE) & ERR_INT_SMI_DONE) {
-		writel(~ERR_INT_SMI_DONE, msp->base + ERR_INT_CAUSE);
-		wake_up(&msp->smi_busy_wait);
-		return IRQ_HANDLED;
-	}
-
-	return IRQ_NONE;
-}
-
-static int smi_is_done(struct mv643xx_eth_shared_private *msp)
-{
-	return !(readl(msp->base + SMI_REG) & SMI_BUSY);
-}
-
-static int smi_wait_ready(struct mv643xx_eth_shared_private *msp)
-{
-	if (msp->err_interrupt == NO_IRQ) {
-		int i;
-
-		for (i = 0; !smi_is_done(msp); i++) {
-			if (i == 10)
-				return -ETIMEDOUT;
-			msleep(10);
-		}
-
-		return 0;
-	}
-
-	if (!smi_is_done(msp)) {
-		wait_event_timeout(msp->smi_busy_wait, smi_is_done(msp),
-				   msecs_to_jiffies(100));
-		if (!smi_is_done(msp))
-			return -ETIMEDOUT;
-	}
-
-	return 0;
-}
-
-static int smi_bus_read(struct mii_bus *bus, int addr, int reg)
-{
-	struct mv643xx_eth_shared_private *msp = bus->priv;
-	void __iomem *smi_reg = msp->base + SMI_REG;
-	int ret;
-
-	if (smi_wait_ready(msp)) {
-		pr_warn("SMI bus busy timeout\n");
-		return -ETIMEDOUT;
-	}
-
-	writel(SMI_OPCODE_READ | (reg << 21) | (addr << 16), smi_reg);
-
-	if (smi_wait_ready(msp)) {
-		pr_warn("SMI bus busy timeout\n");
-		return -ETIMEDOUT;
-	}
-
-	ret = readl(smi_reg);
-	if (!(ret & SMI_READ_VALID)) {
-		pr_warn("SMI bus read not valid\n");
-		return -ENODEV;
-	}
-
-	return ret & 0xffff;
-}
-
-static int smi_bus_write(struct mii_bus *bus, int addr, int reg, u16 val)
-{
-	struct mv643xx_eth_shared_private *msp = bus->priv;
-	void __iomem *smi_reg = msp->base + SMI_REG;
-
-	if (smi_wait_ready(msp)) {
-		pr_warn("SMI bus busy timeout\n");
-		return -ETIMEDOUT;
-	}
-
-	writel(SMI_OPCODE_WRITE | (reg << 21) |
-		(addr << 16) | (val & 0xffff), smi_reg);
-
-	if (smi_wait_ready(msp)) {
-		pr_warn("SMI bus busy timeout\n");
-		return -ETIMEDOUT;
-	}
-
-	return 0;
-}
-
 
 /* statistics ***************************************************************/
 static struct net_device_stats *mv643xx_eth_get_stats(struct net_device *dev)
···
 		goto out_free;
 
 	/*
-	 * Set up and register SMI bus.
-	 */
-	if (pd == NULL || pd->shared_smi == NULL) {
-		msp->smi_bus = mdiobus_alloc();
-		if (msp->smi_bus == NULL)
-			goto out_unmap;
-
-		msp->smi_bus->priv = msp;
-		msp->smi_bus->name = "mv643xx_eth smi";
-		msp->smi_bus->read = smi_bus_read;
-		msp->smi_bus->write = smi_bus_write,
-		snprintf(msp->smi_bus->id, MII_BUS_ID_SIZE, "%s-%d",
-			pdev->name, pdev->id);
-		msp->smi_bus->parent = &pdev->dev;
-		msp->smi_bus->phy_mask = 0xffffffff;
-		if (mdiobus_register(msp->smi_bus) < 0)
-			goto out_free_mii_bus;
-		msp->smi = msp;
-	} else {
-		msp->smi = platform_get_drvdata(pd->shared_smi);
-	}
-
-	msp->err_interrupt = NO_IRQ;
-	init_waitqueue_head(&msp->smi_busy_wait);
-
-	/*
-	 * Check whether the error interrupt is hooked up.
-	 */
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (res != NULL) {
-		int err;
-
-		err = request_irq(res->start, mv643xx_eth_err_irq,
-				  IRQF_SHARED, "mv643xx_eth", msp);
-		if (!err) {
-			writel(ERR_INT_SMI_DONE, msp->base + ERR_INT_MASK);
-			msp->err_interrupt = res->start;
-		}
-	}
-
-	/*
 	 * (Re-)program MBUS remapping windows if we are asked to.
 	 */
 	dram = mv_mbus_dram_info();
···
 
 	return 0;
 
-out_free_mii_bus:
-	mdiobus_free(msp->smi_bus);
-out_unmap:
-	iounmap(msp->base);
 out_free:
 	kfree(msp);
 out:
···
 static int mv643xx_eth_shared_remove(struct platform_device *pdev)
 {
 	struct mv643xx_eth_shared_private *msp = platform_get_drvdata(pdev);
-	struct mv643xx_eth_shared_platform_data *pd = pdev->dev.platform_data;
 
-	if (pd == NULL || pd->shared_smi == NULL) {
-		mdiobus_unregister(msp->smi_bus);
-		mdiobus_free(msp->smi_bus);
-	}
-	if (msp->err_interrupt != NO_IRQ)
-		free_irq(msp->err_interrupt, msp);
 	iounmap(msp->base);
 	kfree(msp);
 
···
 	mp->txq_count = pd->tx_queue_count ? : 1;
 }
 
+static void mv643xx_eth_adjust_link(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	mv643xx_adjust_pscr(mp);
+}
+
 static struct phy_device *phy_scan(struct mv643xx_eth_private *mp,
 				   int phy_addr)
 {
-	struct mii_bus *bus = mp->shared->smi->smi_bus;
 	struct phy_device *phydev;
 	int start;
 	int num;
 	int i;
+	char phy_id[MII_BUS_ID_SIZE + 3];
 
 	if (phy_addr == MV643XX_ETH_PHY_ADDR_DEFAULT) {
 		start = phy_addr_get(mp) & 0x1f;
···
 		num = 1;
 	}
 
+	/* Attempt to connect to the PHY using orion-mdio */
 	phydev = NULL;
 	for (i = 0; i < num; i++) {
 		int addr = (start + i) & 0x1f;
 
-		if (bus->phy_map[addr] == NULL)
-			mdiobus_scan(bus, addr);
+		snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
+				"orion-mdio-mii", addr);
 
-		if (phydev == NULL) {
-			phydev = bus->phy_map[addr];
-			if (phydev != NULL)
-				phy_addr_set(mp, addr);
+		phydev = phy_connect(mp->dev, phy_id, mv643xx_eth_adjust_link,
+				PHY_INTERFACE_MODE_GMII);
+		if (!IS_ERR(phydev)) {
+			phy_addr_set(mp, addr);
+			break;
 		}
 	}
 
···
 	struct phy_device *phy = mp->phy;
 
 	phy_reset(mp);
-
-	phy_attach(mp->dev, dev_name(&phy->dev), PHY_INTERFACE_MODE_GMII);
 
 	if (speed == 0) {
 		phy->autoneg = AUTONEG_ENABLE;

include/linux/mv643xx_eth.h

···
 
 struct mv643xx_eth_shared_platform_data {
 	struct mbus_dram_target_info	*dram;
-	struct platform_device	*shared_smi;
 	/*
 	 * Max packet size for Tx IP/Layer 4 checksum, when set to 0, default
 	 * limit of 9KiB will be used.