[POWERPC] pasemi: clean up mdio_gpio a bit

Misc cleanups of mdio_gpio:
* Better error handling/unrolling in case of init/alloc failures
* Go through child nodes and get their interrupts instead of using
  hardcoded values
* Remap the GPIO registers at module load/driver init instead of during probe
* Coding style and other misc cleanups

Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/powerpc/platforms/pasemi/gpio_mdio.c b/arch/powerpc/platforms/pasemi/gpio_mdio.c
index dae9f65..95d0c78 100644 (file)
--- a/arch/powerpc/platforms/pasemi/gpio_mdio.c
+++ b/arch/powerpc/platforms/pasemi/gpio_mdio.c
@@ -218,45 +218,27 @@ static int __devinit gpio_mdio_probe(struct of_device *ofdev,
                                     const struct of_device_id *match)
 {
        struct device *dev = &ofdev->dev;
-       struct device_node *np = ofdev->node;
-       struct device_node *gpio_np;
+       struct device_node *phy_dn, *np = ofdev->node;
        struct mii_bus *new_bus;
-       struct resource res;
        struct gpio_priv *priv;
        const unsigned int *prop;
-       int err = 0;
+       int err;
        int i;
 
-       gpio_np = of_find_compatible_node(NULL, "gpio", "1682m-gpio");
-
-       if (!gpio_np)
-               return -ENODEV;
-
-       err = of_address_to_resource(gpio_np, 0, &res);
-       of_node_put(gpio_np);
-
-       if (err)
-               return -EINVAL;
-
-       if (!gpio_regs)
-               gpio_regs = ioremap(res.start, 0x100);
-
-       if (!gpio_regs)
-               return -EPERM;
-
+       err = -ENOMEM;
        priv = kzalloc(sizeof(struct gpio_priv), GFP_KERNEL);
-       if (priv == NULL)
-               return -ENOMEM;
+       if (!priv)
+               goto out;
 
        new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
 
-       if (new_bus == NULL)
-               return -ENOMEM;
+       if (!new_bus)
+               goto out_free_priv;
 
-       new_bus->name = "pasemi gpio mdio bus",
-       new_bus->read = &gpio_mdio_read,
-       new_bus->write = &gpio_mdio_write,
-       new_bus->reset = &gpio_mdio_reset,
+       new_bus->name = "pasemi gpio mdio bus";
+       new_bus->read = &gpio_mdio_read;
+       new_bus->write = &gpio_mdio_write;
+       new_bus->reset = &gpio_mdio_reset;
 
        prop = of_get_property(np, "reg", NULL);
        new_bus->id = *prop;
@@ -265,9 +247,24 @@ static int __devinit gpio_mdio_probe(struct of_device *ofdev,
        new_bus->phy_mask = 0;
 
        new_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
-       for(i = 0; i < PHY_MAX_ADDR; ++i)
-               new_bus->irq[i] = irq_create_mapping(NULL, 10);
 
+       if (!new_bus->irq)
+               goto out_free_bus;
+
+       for (i = 0; i < PHY_MAX_ADDR; i++)
+               new_bus->irq[i] = NO_IRQ;
+
+       for (phy_dn = of_get_next_child(np, NULL);
+            phy_dn != NULL;
+            phy_dn = of_get_next_child(np, phy_dn)) {
+               const unsigned int *ip, *regp;
+
+               ip = of_get_property(phy_dn, "interrupts", NULL);
+               regp = of_get_property(phy_dn, "reg", NULL);
+               if (!ip || !regp || *regp >= PHY_MAX_ADDR)
+                       continue;
+               new_bus->irq[*regp] = irq_create_mapping(NULL, *ip);
+       }
 
        prop = of_get_property(np, "mdc-pin", NULL);
        priv->mdc_pin = *prop;
@@ -280,17 +277,21 @@ static int __devinit gpio_mdio_probe(struct of_device *ofdev,
 
        err = mdiobus_register(new_bus);
 
-       if (0 != err) {
+       if (err != 0) {
                printk(KERN_ERR "%s: Cannot register as MDIO bus, err %d\n",
                                new_bus->name, err);
-               goto bus_register_fail;
+               goto out_free_irq;
        }
 
        return 0;
 
-bus_register_fail:
+out_free_irq:
+       kfree(new_bus->irq);
+out_free_bus:
        kfree(new_bus);
-
+out_free_priv:
+       kfree(priv);
+out:
        return err;
 }
 
@@ -330,12 +331,25 @@ static struct of_platform_driver gpio_mdio_driver =
 
 int gpio_mdio_init(void)
 {
+       struct device_node *np;
+
+       np = of_find_compatible_node(NULL, "gpio", "1682m-gpio");
+       if (!np)
+               return -ENODEV;
+       gpio_regs = of_iomap(np, 0);
+       of_node_put(np);
+
+       if (!gpio_regs)
+               return -ENODEV;
+
        return of_register_platform_driver(&gpio_mdio_driver);
 }
+module_init(gpio_mdio_init);
 
 void gpio_mdio_exit(void)
 {
        of_unregister_platform_driver(&gpio_mdio_driver);
+       if (gpio_regs)
+               iounmap(gpio_regs);
 }
-device_initcall(gpio_mdio_init);
-
+module_exit(gpio_mdio_exit);