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-rw-r--r--drivers/net/phy/phy.c583
1 files changed, 583 insertions, 0 deletions
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
new file mode 100644
index 0000000000..88c3ff7723
--- /dev/null
+++ b/drivers/net/phy/phy.c
@@ -0,0 +1,583 @@
+/*
+ * drivers/net/phy/phy.c
+ *
+ * Framework for finding and configuring PHYs.
+ * Also contains generic PHY driver
+ *
+ * Copyright (c) 2009-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Author: Andy Fleming
+ *
+ * Copyright (c) 2004 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <common.h>
+#include <driver.h>
+#include <net.h>
+#include <malloc.h>
+#include <linux/phy.h>
+#include <linux/phy.h>
+#include <linux/err.h>
+
+#define PHY_AN_TIMEOUT 10
+
+static int genphy_config_init(struct phy_device *phydev);
+
+int phy_update_status(struct phy_device *dev)
+{
+ struct phy_driver *drv = to_phy_driver(dev->dev.driver);
+ struct eth_device *edev = dev->attached_dev;
+ int ret;
+ int oldspeed = dev->speed, oldduplex = dev->duplex;
+
+ ret = drv->read_status(dev);
+ if (ret)
+ return ret;
+
+ if (dev->speed == oldspeed && dev->duplex == oldduplex)
+ return 0;
+
+ if (dev->adjust_link)
+ dev->adjust_link(edev);
+
+ if (dev->link)
+ printf("%dMbps %s duplex link detected\n", dev->speed,
+ dev->duplex ? "full" : "half");
+
+ return 0;
+}
+
+struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id)
+{
+ struct phy_device *dev;
+
+ /* We allocate the device, and initialize the
+ * default values */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+
+ if (NULL == dev)
+ return (struct phy_device*) PTR_ERR((void*)-ENOMEM);
+
+ dev->speed = 0;
+ dev->duplex = -1;
+ dev->pause = dev->asym_pause = 0;
+ dev->link = 1;
+ dev->autoneg = AUTONEG_ENABLE;
+
+ dev->addr = addr;
+ dev->phy_id = phy_id;
+
+ dev->bus = bus;
+ dev->dev.parent = bus->parent;
+ dev->dev.bus = &mdio_bus_type;
+
+ strcpy(dev->dev.name, "phy");
+ dev->dev.id = DEVICE_ID_DYNAMIC;
+
+ return dev;
+}
+/**
+ * get_phy_id - reads the specified addr for its ID.
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ * @phy_id: where to store the ID retrieved.
+ *
+ * Description: Reads the ID registers of the PHY at @addr on the
+ * @bus, stores it in @phy_id and returns zero on success.
+ */
+int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
+{
+ int phy_reg;
+
+ /* Grab the bits from PHYIR1, and put them
+ * in the upper half */
+ phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
+
+ if (phy_reg < 0)
+ return -EIO;
+
+ *phy_id = (phy_reg & 0xffff) << 16;
+
+ /* Grab the bits from PHYIR2, and put them in the lower half */
+ phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
+
+ if (phy_reg < 0)
+ return -EIO;
+
+ *phy_id |= (phy_reg & 0xffff);
+
+ return 0;
+}
+
+/**
+ * get_phy_device - reads the specified PHY device and returns its @phy_device struct
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ *
+ * Description: Reads the ID registers of the PHY at @addr on the
+ * @bus, then allocates and returns the phy_device to represent it.
+ */
+struct phy_device *get_phy_device(struct mii_bus *bus, int addr)
+{
+ struct phy_device *dev = NULL;
+ u32 phy_id = 0;
+ int r;
+
+ r = get_phy_id(bus, addr, &phy_id);
+ if (r)
+ return ERR_PTR(r);
+
+ /* If the phy_id is mostly Fs, there is no device there */
+ if ((phy_id & 0x1fffffff) == 0x1fffffff)
+ return NULL;
+
+ dev = phy_device_create(bus, addr, phy_id);
+
+ return dev;
+}
+
+/* Automatically gets and returns the PHY device */
+int phy_device_connect(struct eth_device *edev, struct mii_bus *bus, int addr,
+ void (*adjust_link) (struct eth_device *edev),
+ u32 flags, phy_interface_t interface)
+{
+ struct phy_driver* drv;
+ struct phy_device* dev = NULL;
+ unsigned int i;
+ int ret = -EINVAL;
+
+ if (!edev->phydev) {
+ if (addr >= 0) {
+ dev = bus->phy_map[addr];
+ if (!dev) {
+ ret = -EIO;
+ goto fail;
+ }
+
+ dev->attached_dev = edev;
+ dev->interface = interface;
+ dev->dev_flags = flags;
+
+ ret = register_device(&dev->dev);
+ if (ret)
+ goto fail;
+ } else {
+ for (i = 0; i < PHY_MAX_ADDR && !edev->phydev; i++) {
+ dev = bus->phy_map[i];
+ if (!dev || dev->attached_dev)
+ continue;
+
+ dev->attached_dev = edev;
+ dev->interface = interface;
+ dev->dev_flags = flags;
+
+ ret = register_device(&dev->dev);
+ if (ret)
+ goto fail;
+
+ break;
+ }
+ }
+
+ if (!edev->phydev) {
+ ret = -EIO;
+ goto fail;
+ }
+ }
+
+ dev = edev->phydev;
+ drv = to_phy_driver(dev->dev.driver);
+
+ drv->config_aneg(dev);
+
+ dev->adjust_link = adjust_link;
+
+ return 0;
+
+fail:
+ if (dev)
+ dev->attached_dev = NULL;
+ puts("Unable to find a PHY (unknown ID?)\n");
+ return ret;
+}
+
+/* Generic PHY support and helper functions */
+
+/**
+ * genphy_config_advert - sanitize and advertise auto-negotiation parameters
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MII_ADVERTISE with the appropriate values,
+ * after sanitizing the values to make sure we only advertise
+ * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
+ * hasn't changed, and > 0 if it has changed.
+ */
+int genphy_config_advert(struct phy_device *phydev)
+{
+ u32 advertise;
+ int oldadv, adv;
+ int err, changed = 0;
+
+ /* Only allow advertising what
+ * this PHY supports */
+ phydev->advertising &= phydev->supported;
+ advertise = phydev->advertising;
+
+ /* Setup standard advertisement */
+ oldadv = adv = phy_read(phydev, MII_ADVERTISE);
+
+ if (adv < 0)
+ return adv;
+
+ adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
+ ADVERTISE_PAUSE_ASYM);
+ adv |= ethtool_adv_to_mii_adv_t(advertise);
+
+ if (adv != oldadv) {
+ err = phy_write(phydev, MII_ADVERTISE, adv);
+
+ if (err < 0)
+ return err;
+ changed = 1;
+ }
+
+ /* Configure gigabit if it's supported */
+ if (phydev->supported & (SUPPORTED_1000baseT_Half |
+ SUPPORTED_1000baseT_Full)) {
+ oldadv = adv = phy_read(phydev, MII_CTRL1000);
+
+ if (adv < 0)
+ return adv;
+
+ adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
+ adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
+
+ if (adv != oldadv) {
+ err = phy_write(phydev, MII_CTRL1000, adv);
+
+ if (err < 0)
+ return err;
+ changed = 1;
+ }
+ }
+
+ return changed;
+}
+
+/**
+ * genphy_setup_forced - configures/forces speed/duplex from @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Configures MII_BMCR to force speed/duplex
+ * to the values in phydev. Assumes that the values are valid.
+ * Please see phy_sanitize_settings().
+ */
+int genphy_setup_forced(struct phy_device *phydev)
+{
+ int err;
+ int ctl = 0;
+
+ phydev->pause = phydev->asym_pause = 0;
+
+ if (SPEED_1000 == phydev->speed)
+ ctl |= BMCR_SPEED1000;
+ else if (SPEED_100 == phydev->speed)
+ ctl |= BMCR_SPEED100;
+
+ if (DUPLEX_FULL == phydev->duplex)
+ ctl |= BMCR_FULLDPLX;
+
+ err = phy_write(phydev, MII_BMCR, ctl);
+
+ return err;
+}
+
+static int phy_aneg_done(struct phy_device *phydev)
+{
+ uint64_t start = get_time_ns();
+ int ctl;
+
+ while (!is_timeout(start, PHY_AN_TIMEOUT * SECOND)) {
+ ctl = phy_read(phydev, MII_BMSR);
+ if (ctl & BMSR_ANEGCOMPLETE) {
+ phydev->link = 1;
+ return 0;
+ }
+
+ /* Restart auto-negotiation if remote fault */
+ if (ctl & BMSR_RFAULT) {
+ puts("PHY remote fault detected\n"
+ "PHY restarting auto-negotiation\n");
+ phy_write(phydev, MII_BMCR,
+ BMCR_ANENABLE | BMCR_ANRESTART);
+ }
+ }
+
+ phydev->link = 0;
+ return -ETIMEDOUT;
+}
+
+/**
+ * genphy_restart_aneg - Enable and Restart Autonegotiation
+ * @phydev: target phy_device struct
+ */
+int genphy_restart_aneg(struct phy_device *phydev)
+{
+ int ctl;
+
+ ctl = phy_read(phydev, MII_BMCR);
+
+ if (ctl < 0)
+ return ctl;
+
+ ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
+
+ /* Don't isolate the PHY if we're negotiating */
+ ctl &= ~(BMCR_ISOLATE);
+
+ ctl = phy_write(phydev, MII_BMCR, ctl);
+
+ if (ctl < 0)
+ return ctl;
+
+ return phy_aneg_done(phydev);
+}
+
+/**
+ * genphy_config_aneg - restart auto-negotiation or write BMCR
+ * @phydev: target phy_device struct
+ *
+ * Description: If auto-negotiation is enabled, we configure the
+ * advertising, and then restart auto-negotiation. If it is not
+ * enabled, then we write the BMCR.
+ */
+int genphy_config_aneg(struct phy_device *phydev)
+{
+ int result;
+
+ if (AUTONEG_ENABLE != phydev->autoneg)
+ return genphy_setup_forced(phydev);
+
+ result = genphy_config_advert(phydev);
+
+ if (result < 0) /* error */
+ return result;
+
+ if (result == 0) {
+ /* Advertisement hasn't changed, but maybe aneg was never on to
+ * begin with? Or maybe phy was isolated? */
+ int ctl = phy_read(phydev, MII_BMCR);
+
+ if (ctl < 0)
+ return ctl;
+
+ if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
+ result = 1; /* do restart aneg */
+ }
+
+ /* Only restart aneg if we are advertising something different
+ * than we were before. */
+ if (result > 0)
+ result = genphy_restart_aneg(phydev);
+
+ return result;
+}
+
+/**
+ * genphy_update_link - update link status in @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Update the value in phydev->link to reflect the
+ * current link value. In order to do this, we need to read
+ * the status register twice, keeping the second value.
+ */
+int genphy_update_link(struct phy_device *phydev)
+{
+ int status;
+
+ /* Do a fake read */
+ status = phy_read(phydev, MII_BMSR);
+
+ if (status < 0)
+ return status;
+
+ /* wait phy status update in the phy */
+ udelay(1000);
+
+ /* Read link and autonegotiation status */
+ status = phy_read(phydev, MII_BMSR);
+
+ if (status < 0)
+ return status;
+
+ if ((status & BMSR_LSTATUS) == 0)
+ phydev->link = 0;
+ else
+ phydev->link = 1;
+
+ return 0;
+}
+
+/**
+ * genphy_read_status - check the link status and update current link state
+ * @phydev: target phy_device struct
+ *
+ * Description: Check the link, then figure out the current state
+ * by comparing what we advertise with what the link partner
+ * advertises. Start by checking the gigabit possibilities,
+ * then move on to 10/100.
+ */
+int genphy_read_status(struct phy_device *phydev)
+{
+ int adv;
+ int err;
+ int lpa;
+ int lpagb = 0;
+
+ /* Update the link, but return if there
+ * was an error */
+ err = genphy_update_link(phydev);
+ if (err)
+ return err;
+
+ if (AUTONEG_ENABLE == phydev->autoneg) {
+ if (phydev->supported & (SUPPORTED_1000baseT_Half
+ | SUPPORTED_1000baseT_Full)) {
+ lpagb = phy_read(phydev, MII_STAT1000);
+
+ if (lpagb < 0)
+ return lpagb;
+
+ adv = phy_read(phydev, MII_CTRL1000);
+
+ if (adv < 0)
+ return adv;
+
+ lpagb &= adv << 2;
+ }
+
+ lpa = phy_read(phydev, MII_LPA);
+
+ if (lpa < 0)
+ return lpa;
+
+ adv = phy_read(phydev, MII_ADVERTISE);
+
+ if (adv < 0)
+ return adv;
+
+ lpa &= adv;
+
+ phydev->speed = SPEED_10;
+ phydev->duplex = DUPLEX_HALF;
+ phydev->pause = phydev->asym_pause = 0;
+
+ if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
+ phydev->speed = SPEED_1000;
+
+ if (lpagb & LPA_1000FULL)
+ phydev->duplex = DUPLEX_FULL;
+ } else if (lpa & (LPA_100FULL | LPA_100HALF)) {
+ phydev->speed = SPEED_100;
+
+ if (lpa & LPA_100FULL)
+ phydev->duplex = DUPLEX_FULL;
+ } else
+ if (lpa & LPA_10FULL)
+ phydev->duplex = DUPLEX_FULL;
+
+ if (phydev->duplex == DUPLEX_FULL) {
+ phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
+ phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
+ }
+ } else {
+ int bmcr = phy_read(phydev, MII_BMCR);
+ if (bmcr < 0)
+ return bmcr;
+
+ if (bmcr & BMCR_FULLDPLX)
+ phydev->duplex = DUPLEX_FULL;
+ else
+ phydev->duplex = DUPLEX_HALF;
+
+ if (bmcr & BMCR_SPEED1000)
+ phydev->speed = SPEED_1000;
+ else if (bmcr & BMCR_SPEED100)
+ phydev->speed = SPEED_100;
+ else
+ phydev->speed = SPEED_10;
+
+ phydev->pause = phydev->asym_pause = 0;
+ }
+
+ return 0;
+}
+
+static int genphy_config_init(struct phy_device *phydev)
+{
+ int val;
+ u32 features;
+
+ /* For now, I'll claim that the generic driver supports
+ * all possible port types */
+ features = (SUPPORTED_TP | SUPPORTED_MII
+ | SUPPORTED_AUI | SUPPORTED_FIBRE |
+ SUPPORTED_BNC);
+
+ /* Do we support autonegotiation? */
+ val = phy_read(phydev, MII_BMSR);
+
+ if (val < 0)
+ return val;
+
+ if (val & BMSR_ANEGCAPABLE)
+ features |= SUPPORTED_Autoneg;
+
+ if (val & BMSR_100FULL)
+ features |= SUPPORTED_100baseT_Full;
+ if (val & BMSR_100HALF)
+ features |= SUPPORTED_100baseT_Half;
+ if (val & BMSR_10FULL)
+ features |= SUPPORTED_10baseT_Full;
+ if (val & BMSR_10HALF)
+ features |= SUPPORTED_10baseT_Half;
+
+ if (val & BMSR_ESTATEN) {
+ val = phy_read(phydev, MII_ESTATUS);
+
+ if (val < 0)
+ return val;
+
+ if (val & ESTATUS_1000_TFULL)
+ features |= SUPPORTED_1000baseT_Full;
+ if (val & ESTATUS_1000_THALF)
+ features |= SUPPORTED_1000baseT_Half;
+ }
+
+ phydev->supported = features;
+ phydev->advertising = features;
+
+ return 0;
+}
+
+int phy_driver_register(struct phy_driver *phydrv)
+{
+ phydrv->drv.bus = &mdio_bus_type;
+
+ if (!phydrv->config_init)
+ phydrv->config_init = genphy_config_init;
+
+ if (!phydrv->config_aneg)
+ phydrv->config_aneg = genphy_config_aneg;
+
+ if (!phydrv->read_status)
+ phydrv->read_status = genphy_read_status;
+
+ return register_driver(&phydrv->drv);
+}
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