#include <asm/irq.h>
#include <asm/uaccess.h>
+/**
+ * mdiobus_alloc - allocate a mii_bus structure
+ *
+ * Description: called by a bus driver to allocate an mii_bus
+ * structure to fill in.
+ */
+struct mii_bus *mdiobus_alloc(void)
+{
+ struct mii_bus *bus;
+
+ bus = kzalloc(sizeof(*bus), GFP_KERNEL);
+ if (bus != NULL)
+ bus->state = MDIOBUS_ALLOCATED;
+
+ return bus;
+}
+EXPORT_SYMBOL(mdiobus_alloc);
+
+/**
+ * mdiobus_release - mii_bus device release callback
+ * @d: the target struct device that contains the mii_bus
+ *
+ * Description: called when the last reference to an mii_bus is
+ * dropped, to free the underlying memory.
+ */
+static void mdiobus_release(struct device *d)
+{
+ struct mii_bus *bus = to_mii_bus(d);
+ BUG_ON(bus->state != MDIOBUS_RELEASED);
+ kfree(bus);
+}
+
+static struct class mdio_bus_class = {
+ .name = "mdio_bus",
+ .dev_release = mdiobus_release,
+};
+
/**
* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
* @bus: target mii_bus
NULL == bus->write)
return -EINVAL;
- mutex_init(&bus->mdio_lock);
+ BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
+ bus->state != MDIOBUS_UNREGISTERED);
- if (bus->reset)
- bus->reset(bus);
+ bus->dev.parent = bus->parent;
+ bus->dev.class = &mdio_bus_class;
+ bus->dev.groups = NULL;
+ dev_set_name(&bus->dev, bus->id);
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- struct phy_device *phydev;
-
- if (bus->phy_mask & (1 << i)) {
- bus->phy_map[i] = NULL;
- continue;
- }
-
- phydev = get_phy_device(bus, i);
-
- if (IS_ERR(phydev))
- return PTR_ERR(phydev);
+ err = device_register(&bus->dev);
+ if (err) {
+ printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
+ return -EINVAL;
+ }
- /* There's a PHY at this address
- * We need to set:
- * 1) IRQ
- * 2) bus_id
- * 3) parent
- * 4) bus
- * 5) mii_bus
- * And, we need to register it */
- if (phydev) {
- phydev->irq = bus->irq[i];
+ bus->state = MDIOBUS_REGISTERED;
- phydev->dev.parent = bus->dev;
- phydev->dev.bus = &mdio_bus_type;
- snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i);
+ mutex_init(&bus->mdio_lock);
- phydev->bus = bus;
+ if (bus->reset)
+ bus->reset(bus);
- err = device_register(&phydev->dev);
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ bus->phy_map[i] = NULL;
+ if ((bus->phy_mask & (1 << i)) == 0) {
+ struct phy_device *phydev;
- if (err) {
- printk(KERN_ERR "phy %d failed to register\n",
- i);
- phy_device_free(phydev);
- phydev = NULL;
- }
+ phydev = mdiobus_scan(bus, i);
+ if (IS_ERR(phydev))
+ err = PTR_ERR(phydev);
}
-
- bus->phy_map[i] = phydev;
}
pr_info("%s: probed\n", bus->name);
{
int i;
+ BUG_ON(bus->state != MDIOBUS_REGISTERED);
+ bus->state = MDIOBUS_UNREGISTERED;
+
+ device_unregister(&bus->dev);
for (i = 0; i < PHY_MAX_ADDR; i++) {
if (bus->phy_map[i])
device_unregister(&bus->phy_map[i]->dev);
}
EXPORT_SYMBOL(mdiobus_unregister);
+/**
+ * mdiobus_free - free a struct mii_bus
+ * @bus: mii_bus to free
+ *
+ * This function releases the reference to the underlying device
+ * object in the mii_bus. If this is the last reference, the mii_bus
+ * will be freed.
+ */
+void mdiobus_free(struct mii_bus *bus)
+{
+ /*
+ * For compatibility with error handling in drivers.
+ */
+ if (bus->state == MDIOBUS_ALLOCATED) {
+ kfree(bus);
+ return;
+ }
+
+ BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
+ bus->state = MDIOBUS_RELEASED;
+
+ put_device(&bus->dev);
+}
+EXPORT_SYMBOL(mdiobus_free);
+
+struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
+{
+ struct phy_device *phydev;
+ int err;
+
+ phydev = get_phy_device(bus, addr);
+ if (IS_ERR(phydev) || phydev == NULL)
+ return phydev;
+
+ /* There's a PHY at this address
+ * We need to set:
+ * 1) IRQ
+ * 2) bus_id
+ * 3) parent
+ * 4) bus
+ * 5) mii_bus
+ * And, we need to register it */
+
+ phydev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
+
+ phydev->dev.parent = bus->parent;
+ phydev->dev.bus = &mdio_bus_type;
+ dev_set_name(&phydev->dev, PHY_ID_FMT, bus->id, addr);
+
+ phydev->bus = bus;
+
+ /* Run all of the fixups for this PHY */
+ phy_scan_fixups(phydev);
+
+ err = device_register(&phydev->dev);
+ if (err) {
+ printk(KERN_ERR "phy %d failed to register\n", addr);
+ phy_device_free(phydev);
+ phydev = NULL;
+ }
+
+ bus->phy_map[addr] = phydev;
+
+ return phydev;
+}
+EXPORT_SYMBOL(mdiobus_scan);
+
+/**
+ * mdiobus_read - Convenience function for reading a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to read
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum)
+{
+ int retval;
+
+ BUG_ON(in_interrupt());
+
+ mutex_lock(&bus->mdio_lock);
+ retval = bus->read(bus, addr, regnum);
+ mutex_unlock(&bus->mdio_lock);
+
+ return retval;
+}
+EXPORT_SYMBOL(mdiobus_read);
+
+/**
+ * mdiobus_write - Convenience function for writing a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val)
+{
+ int err;
+
+ BUG_ON(in_interrupt());
+
+ mutex_lock(&bus->mdio_lock);
+ err = bus->write(bus, addr, regnum, val);
+ mutex_unlock(&bus->mdio_lock);
+
+ return err;
+}
+EXPORT_SYMBOL(mdiobus_write);
+
/**
* mdio_bus_match - determine if given PHY driver supports the given PHY device
* @dev: target PHY device
int __init mdio_bus_init(void)
{
- return bus_register(&mdio_bus_type);
+ int ret;
+
+ ret = class_register(&mdio_bus_class);
+ if (!ret) {
+ ret = bus_register(&mdio_bus_type);
+ if (ret)
+ class_unregister(&mdio_bus_class);
+ }
+
+ return ret;
}
void mdio_bus_exit(void)
{
+ class_unregister(&mdio_bus_class);
bus_unregister(&mdio_bus_type);
}
projects / linux-2.6-omap-h63xx.git / blobdiff