gianfar: Convert gianfar to an of_platform_driver

Does the same for the accompanying MDIO driver, and then modifies the TBI
configuration method.  The old way used fields in einfo, which no longer
exists.  The new way is to create an MDIO device-tree node for each instance
of gianfar, and create a tbi-handle property to associate ethernet controllers
with the TBI PHYs they are connected to.

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 144 insertions, 68 deletions

diff --git a/drivers/net/gianfar_mii.c b/drivers/net/gianfar_mii.c
index 0e2595d24933..f3706e415b45 100644
--- a/drivers/net/gianfar_mii.c
+++ b/drivers/net/gianfar_mii.c
@@ -34,6 +34,8 @@
 #include <linux/crc32.h>
 #include <linux/mii.h>
 #include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -150,19 +152,83 @@ static int gfar_mdio_reset(struct mii_bus *bus)
 	return 0;
 }
 
+/* Allocate an array which provides irq #s for each PHY on the given bus */
+static int *create_irq_map(struct device_node *np)
+{
+	int *irqs;
+	int i;
+	struct device_node *child = NULL;
+
+	irqs = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
+
+	if (!irqs)
+		return NULL;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		irqs[i] = PHY_POLL;
+
+	while ((child = of_get_next_child(np, child)) != NULL) {
+		int irq = irq_of_parse_and_map(child, 0);
+		const u32 *id;
+
+		if (irq == NO_IRQ)
+			continue;
+
+		id = of_get_property(child, "reg", NULL);
+
+		if (!id)
+			continue;
+
+		if (*id < PHY_MAX_ADDR && *id >= 0)
+			irqs[*id] = irq;
+		else
+			printk(KERN_WARNING "%s: "
+					"%d is not a valid PHY address\n",
+					np->full_name, *id);
+	}
+
+	return irqs;
+}
+
+
+void gfar_mdio_bus_name(char *name, struct device_node *np)
+{
+	const u32 *reg;
+
+	reg = of_get_property(np, "reg", NULL);
 
-static int gfar_mdio_probe(struct device *dev)
+	snprintf(name, MII_BUS_ID_SIZE, "%s@%x", np->name, reg ? *reg : 0);
+}
+
+/* Scan the bus in reverse, looking for an empty spot */
+static int gfar_mdio_find_free(struct mii_bus *new_bus)
+{
+	int i;
+
+	for (i = PHY_MAX_ADDR; i > 0; i--) {
+		u32 phy_id;
+
+		if (get_phy_id(new_bus, i, &phy_id))
+			return -1;
+
+		if (phy_id == 0xffffffff)
+			break;
+	}
+
+	return i;
+}
+
+static int gfar_mdio_probe(struct of_device *ofdev,
+		const struct of_device_id *match)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct gianfar_mdio_data *pdata;
 	struct gfar_mii __iomem *regs;
 	struct gfar __iomem *enet_regs;
 	struct mii_bus *new_bus;
-	struct resource *r;
-	int i, err = 0;
-
-	if (NULL == dev)
-		return -EINVAL;
+	int err = 0;
+	u64 addr, size;
+	struct device_node *np = ofdev->node;
+	struct device_node *tbi;
+	int tbiaddr = -1;
 
 	new_bus = mdiobus_alloc();
 	if (NULL == new_bus)
@@ -172,31 +238,28 @@ static int gfar_mdio_probe(struct device *dev)
 	new_bus->read = &gfar_mdio_read,
 	new_bus->write = &gfar_mdio_write,
 	new_bus->reset = &gfar_mdio_reset,
-	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
-
-	pdata = (struct gianfar_mdio_data *)pdev->dev.platform_data;
-
-	if (NULL == pdata) {
-		printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
-		return -ENODEV;
-	}
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	gfar_mdio_bus_name(new_bus->id, np);
 
 	/* Set the PHY base address */
-	regs = ioremap(r->start, sizeof (struct gfar_mii));
+	addr = of_translate_address(np, of_get_address(np, 0, &size, NULL));
+	regs = ioremap(addr, size);
 
 	if (NULL == regs) {
 		err = -ENOMEM;
-		goto reg_map_fail;
+		goto err_free_bus;
 	}
 
 	new_bus->priv = (void __force *)regs;
 
-	new_bus->irq = pdata->irq;
+	new_bus->irq = create_irq_map(np);
+
+	if (new_bus->irq == NULL) {
+		err = -ENOMEM;
+		goto err_unmap_regs;
+	}
 
-	new_bus->parent = dev;
-	dev_set_drvdata(dev, new_bus);
+	new_bus->parent = &ofdev->dev;
+	dev_set_drvdata(&ofdev->dev, new_bus);
 
 	/*
 	 * This is mildly evil, but so is our hardware for doing this.
@@ -206,96 +269,109 @@ static int gfar_mdio_probe(struct device *dev)
 	enet_regs = (struct gfar __iomem *)
 		((char *)regs - offsetof(struct gfar, gfar_mii_regs));
 
-	/* Scan the bus, looking for an empty spot for TBIPA */
-	gfar_write(&enet_regs->tbipa, 0);
-	for (i = PHY_MAX_ADDR; i > 0; i--) {
-		u32 phy_id;
+	for_each_child_of_node(np, tbi) {
+		if (!strncmp(tbi->type, "tbi-phy", 8))
+			break;
+	}
 
-		err = get_phy_id(new_bus, i, &phy_id);
-		if (err)
-			goto bus_register_fail;
+	if (tbi) {
+		const u32 *prop = of_get_property(tbi, "reg", NULL);
 
-		if (phy_id == 0xffffffff)
-			break;
+		if (prop)
+			tbiaddr = *prop;
 	}
 
-	/* The bus is full.  We don't support using 31 PHYs, sorry */
-	if (i == 0) {
+	if (tbiaddr == -1) {
+		gfar_write(&enet_regs->tbipa, 0);
+
+		tbiaddr = gfar_mdio_find_free(new_bus);
+	}
+
+	/*
+	 * We define TBIPA at 0 to be illegal, opting to fail for boards that
+	 * have PHYs at 1-31, rather than change tbipa and rescan.
+	 */
+	if (tbiaddr == 0) {
 		err = -EBUSY;
 
-		goto bus_register_fail;
+		goto err_free_irqs;
 	}
 
-	gfar_write(&enet_regs->tbipa, i);
+	gfar_write(&enet_regs->tbipa, tbiaddr);
+
+	/*
+	 * The TBIPHY-only buses will find PHYs at every address,
+	 * so we mask them all but the TBI
+	 */
+	if (!of_device_is_compatible(np, "fsl,gianfar-mdio"))
+		new_bus->phy_mask = ~(1 << tbiaddr);
 
 	err = mdiobus_register(new_bus);
 
-	if (0 != err) {
+	if (err != 0) {
 		printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 				new_bus->name);
-		goto bus_register_fail;
+		goto err_free_irqs;
 	}
 
 	return 0;
 
-bus_register_fail:
+err_free_irqs:
+	kfree(new_bus->irq);
+err_unmap_regs:
 	iounmap(regs);
-reg_map_fail:
+err_free_bus:
 	mdiobus_free(new_bus);
 
 	return err;
 }
 
 
-static int gfar_mdio_remove(struct device *dev)
+static int gfar_mdio_remove(struct of_device *ofdev)
 {
-	struct mii_bus *bus = dev_get_drvdata(dev);
+	struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 
 	mdiobus_unregister(bus);
 
-	dev_set_drvdata(dev, NULL);
+	dev_set_drvdata(&ofdev->dev, NULL);
 
 	iounmap((void __iomem *)bus->priv);
 	bus->priv = NULL;
+	kfree(bus->irq);
 	mdiobus_free(bus);
 
 	return 0;
 }
 
-static struct device_driver gianfar_mdio_driver = {
+static struct of_device_id gfar_mdio_match[] =
+{
+	{
+		.compatible = "fsl,gianfar-mdio",
+	},
+	{
+		.compatible = "fsl,gianfar-tbi",
+	},
+	{
+		.type = "mdio",
+		.compatible = "gianfar",
+	},
+	{},
+};
+
+static struct of_platform_driver gianfar_mdio_driver = {
 	.name = "fsl-gianfar_mdio",
-	.bus = &platform_bus_type,
+	.match_table = gfar_mdio_match,
+
 	.probe = gfar_mdio_probe,
 	.remove = gfar_mdio_remove,
 };
 
-static int match_mdio_bus(struct device *dev, void *data)
-{
-	const struct gfar_private *priv = data;
-	const struct platform_device *pdev = to_platform_device(dev);
-
-	return !strcmp(pdev->name, gianfar_mdio_driver.name) &&
-		pdev->id == priv->einfo->mdio_bus;
-}
-
-/* Given a gfar_priv structure, find the mii_bus controlled by this device (not
- * necessarily the same as the bus the gfar's PHY is on), if one exists.
- * Normally only the first gianfar controls a mii_bus.  */
-struct mii_bus *gfar_get_miibus(const struct gfar_private *priv)
-{
-	/*const*/ struct device *d;
-
-	d = bus_find_device(gianfar_mdio_driver.bus, NULL, (void *)priv,
-			    match_mdio_bus);
-	return d ? dev_get_drvdata(d) : NULL;
-}
-
 int __init gfar_mdio_init(void)
 {
-	return driver_register(&gianfar_mdio_driver);
+	return of_register_platform_driver(&gianfar_mdio_driver);
 }
 
 void gfar_mdio_exit(void)
 {
-	driver_unregister(&gianfar_mdio_driver);
+	of_unregister_platform_driver(&gianfar_mdio_driver);
 }