*
*/
#include <linux/kernel.h>
-#include <linux/sched.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
-/* mdiobus_register
+/**
+ * mdiobus_alloc - allocate a mii_bus structure
*
- * description: Called by a bus driver to bring up all the PHYs
- * on a given bus, and attach them to the bus
+ * Description: called by a bus driver to allocate an mii_bus
+ * structure to fill in.
*/
-int mdiobus_register(struct mii_bus *bus)
+struct mii_bus *mdiobus_alloc(void)
{
- int i;
- int err = 0;
+ 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 &&
+ /* for compatibility with error handling in drivers */
+ bus->state != MDIOBUS_ALLOCATED);
+ kfree(bus);
+}
+
+static struct class mdio_bus_class = {
+ .name = "mdio_bus",
+ .dev_release = mdiobus_release,
+};
- spin_lock_init(&bus->mdio_lock);
+/**
+ * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
+ * @bus: target mii_bus
+ *
+ * Description: Called by a bus driver to bring up all the PHYs
+ * on a given bus, and attach them to the bus.
+ *
+ * Returns 0 on success or < 0 on error.
+ */
+int mdiobus_register(struct mii_bus *bus)
+{
+ int i, err;
if (NULL == bus || NULL == bus->name ||
NULL == bus->read ||
NULL == bus->write)
return -EINVAL;
- if (bus->reset)
- bus->reset(bus);
+ BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
+ bus->state != MDIOBUS_UNREGISTERED);
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- struct phy_device *phydev;
-
- if (bus->phy_mask & (1 << i)) {
- bus->phy_map[i] = NULL;
- continue;
- }
+ bus->dev.parent = bus->parent;
+ bus->dev.class = &mdio_bus_class;
+ bus->dev.groups = NULL;
+ dev_set_name(&bus->dev, "%s", bus->id);
- phydev = get_phy_device(bus, i);
-
- if (IS_ERR(phydev))
- return PTR_ERR(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 */
- if (phydev) {
- phydev->irq = bus->irq[i];
+ err = device_register(&bus->dev);
+ if (err) {
+ printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
+ return -EINVAL;
+ }
- 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++) {
+ if ((bus->phy_mask & (1 << i)) == 0) {
+ struct phy_device *phydev;
- if (err)
- printk(KERN_ERR "phy %d failed to register\n",
- i);
+ phydev = mdiobus_scan(bus, i);
+ if (IS_ERR(phydev)) {
+ err = PTR_ERR(phydev);
+ goto error;
+ }
}
-
- bus->phy_map[i] = phydev;
}
+ bus->state = MDIOBUS_REGISTERED;
pr_info("%s: probed\n", bus->name);
+ return 0;
+error:
+ while (--i >= 0) {
+ if (bus->phy_map[i])
+ device_unregister(&bus->phy_map[i]->dev);
+ }
+ device_del(&bus->dev);
return err;
}
EXPORT_SYMBOL(mdiobus_register);
{
int i;
+ BUG_ON(bus->state != MDIOBUS_REGISTERED);
+ bus->state = MDIOBUS_UNREGISTERED;
+
+ device_del(&bus->dev);
for (i = 0; i < PHY_MAX_ADDR; i++) {
- if (bus->phy_map[i]) {
+ if (bus->phy_map[i])
device_unregister(&bus->phy_map[i]->dev);
- kfree(bus->phy_map[i]);
- }
+ bus->phy_map[i] = NULL;
}
}
EXPORT_SYMBOL(mdiobus_unregister);
-/* mdio_bus_match
+/**
+ * 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;
+
+ err = phy_device_register(phydev);
+ if (err) {
+ phy_device_free(phydev);
+ return NULL;
+ }
+
+ 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
+ * @drv: given PHY driver
*
- * description: Given a PHY device, and a PHY driver, return 1 if
- * the driver supports the device. Otherwise, return 0
+ * Description: Given a PHY device, and a PHY driver, return 1 if
+ * the driver supports the device. Otherwise, return 0.
*/
static int mdio_bus_match(struct device *dev, struct device_driver *drv)
{
struct phy_device *phydev = to_phy_device(dev);
struct phy_driver *phydrv = to_phy_driver(drv);
- return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask));
+ return ((phydrv->phy_id & phydrv->phy_id_mask) ==
+ (phydev->phy_id & phydrv->phy_id_mask));
}
-/* Suspend and resume. Copied from platform_suspend and
- * platform_resume
- */
-static int mdio_bus_suspend(struct device * dev, pm_message_t state)
+#ifdef CONFIG_PM
+
+static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
{
- int ret = 0;
- struct device_driver *drv = dev->driver;
+ struct device_driver *drv = phydev->dev.driver;
+ struct phy_driver *phydrv = to_phy_driver(drv);
+ struct net_device *netdev = phydev->attached_dev;
- if (drv && drv->suspend)
- ret = drv->suspend(dev, state);
+ if (!drv || !phydrv->suspend)
+ return false;
- return ret;
+ /* PHY not attached? May suspend. */
+ if (!netdev)
+ return true;
+
+ /*
+ * Don't suspend PHY if the attched netdev parent may wakeup.
+ * The parent may point to a PCI device, as in tg3 driver.
+ */
+ if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
+ return false;
+
+ /*
+ * Also don't suspend PHY if the netdev itself may wakeup. This
+ * is the case for devices w/o underlaying pwr. mgmt. aware bus,
+ * e.g. SoC devices.
+ */
+ if (device_may_wakeup(&netdev->dev))
+ return false;
+
+ return true;
}
-static int mdio_bus_resume(struct device * dev)
+static int mdio_bus_suspend(struct device *dev)
{
- int ret = 0;
- struct device_driver *drv = dev->driver;
+ struct phy_driver *phydrv = to_phy_driver(dev->driver);
+ struct phy_device *phydev = to_phy_device(dev);
- if (drv && drv->resume)
- ret = drv->resume(dev);
+ /*
+ * We must stop the state machine manually, otherwise it stops out of
+ * control, possibly with the phydev->lock held. Upon resume, netdev
+ * may call phy routines that try to grab the same lock, and that may
+ * lead to a deadlock.
+ */
+ if (phydev->attached_dev)
+ phy_stop_machine(phydev);
- return ret;
+ if (!mdio_bus_phy_may_suspend(phydev))
+ return 0;
+
+ return phydrv->suspend(phydev);
+}
+
+static int mdio_bus_resume(struct device *dev)
+{
+ struct phy_driver *phydrv = to_phy_driver(dev->driver);
+ struct phy_device *phydev = to_phy_device(dev);
+ int ret;
+
+ if (!mdio_bus_phy_may_suspend(phydev))
+ goto no_resume;
+
+ ret = phydrv->resume(phydev);
+ if (ret < 0)
+ return ret;
+
+no_resume:
+ if (phydev->attached_dev)
+ phy_start_machine(phydev, NULL);
+
+ return 0;
+}
+
+static int mdio_bus_restore(struct device *dev)
+{
+ struct phy_device *phydev = to_phy_device(dev);
+ struct net_device *netdev = phydev->attached_dev;
+ int ret;
+
+ if (!netdev)
+ return 0;
+
+ ret = phy_init_hw(phydev);
+ if (ret < 0)
+ return ret;
+
+ /* The PHY needs to renegotiate. */
+ phydev->link = 0;
+ phydev->state = PHY_UP;
+
+ phy_start_machine(phydev, NULL);
+
+ return 0;
}
+static struct dev_pm_ops mdio_bus_pm_ops = {
+ .suspend = mdio_bus_suspend,
+ .resume = mdio_bus_resume,
+ .freeze = mdio_bus_suspend,
+ .thaw = mdio_bus_resume,
+ .restore = mdio_bus_restore,
+};
+
+#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
+
+#else
+
+#define MDIO_BUS_PM_OPS NULL
+
+#endif /* CONFIG_PM */
+
struct bus_type mdio_bus_type = {
.name = "mdio_bus",
.match = mdio_bus_match,
- .suspend = mdio_bus_suspend,
- .resume = mdio_bus_resume,
+ .pm = MDIO_BUS_PM_OPS,
};
EXPORT_SYMBOL(mdio_bus_type);
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);
}