IXP4xx: Add PHYLIB support to Ethernet driver.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

1 files changed, 95 insertions, 99 deletions

diff --git a/drivers/net/arm/ixp4xx_eth.c b/drivers/net/arm/ixp4xx_eth.c
index 44679f804be3..db44ebbf45c5 100644
--- a/drivers/net/arm/ixp4xx_eth.c
+++ b/drivers/net/arm/ixp4xx_eth.c
@@ -30,7 +30,7 @@
 #include <linux/etherdevice.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
-#include <linux/mii.h>
+#include <linux/phy.h>
 #include <linux/platform_device.h>
 #include <mach/npe.h>
 #include <mach/qmgr.h>
@@ -59,7 +59,6 @@
 #define NAPI_WEIGHT             16
 #define MDIO_INTERVAL           (3 * HZ)
 #define MAX_MDIO_RETRIES        100 /* microseconds, typically 30 cycles */
-#define MAX_MII_RESET_RETRIES   100 /* mdio_read() cycles, typically 4 */
 #define MAX_CLOSE_WAIT          1000 /* microseconds, typically 2-3 cycles */
 
 #define NPE_ID(port_id)         ((port_id) >> 4)
@@ -164,14 +163,13 @@ struct port {
         struct npe *npe;
         struct net_device *netdev;
         struct napi_struct napi;
-        struct mii_if_info mii;
-        struct delayed_work mdio_thread;
+        struct phy_device *phydev;
         struct eth_plat_info *plat;
         buffer_t *rx_buff_tab[RX_DESCS], *tx_buff_tab[TX_DESCS];
         struct desc *desc_tab;  /* coherent */
         u32 desc_tab_phys;
         int id;                 /* logical port ID */
-        u16 mii_bmcr;
+        int speed, duplex;
 };
 
 /* NPE message structure */
@@ -242,19 +240,20 @@ static inline void memcpy_swab32(u32 *dest, u32 *src, int cnt)
 
 static spinlock_t mdio_lock;
 static struct eth_regs __iomem *mdio_regs; /* mdio command and status only */
+struct mii_bus *mdio_bus;
 static int ports_open;
 static struct port *npe_port_tab[MAX_NPES];
 static struct dma_pool *dma_pool;
 
 
-static u16 mdio_cmd(struct net_device *dev, int phy_id, int location,
-                    int write, u16 cmd)
+static int ixp4xx_mdio_cmd(struct mii_bus *bus, int phy_id, int location,
+                           int write, u16 cmd)
 {
         int cycles = 0;
 
         if (__raw_readl(&mdio_regs->mdio_command[3]) & 0x80) {
-                printk(KERN_ERR "%s: MII not ready to transmit\n", dev->name);
-                return 0;
+                printk(KERN_ERR "%s: MII not ready to transmit\n", bus->name);
+                return -1;
         }
 
         if (write) {
@@ -273,107 +272,119 @@ static u16 mdio_cmd(struct net_device *dev, int phy_id, int location,
         }
 
         if (cycles == MAX_MDIO_RETRIES) {
-                printk(KERN_ERR "%s: MII write failed\n", dev->name);
-                return 0;
+                printk(KERN_ERR "%s #%i: MII write failed\n", bus->name,
+                       phy_id);
+                return -1;
         }
 
 #if DEBUG_MDIO
-        printk(KERN_DEBUG "%s: mdio_cmd() took %i cycles\n", dev->name,
-               cycles);
+        printk(KERN_DEBUG "%s #%i: mdio_%s() took %i cycles\n", bus->name,
+               phy_id, write ? "write" : "read", cycles);
 #endif
 
         if (write)
                 return 0;
 
         if (__raw_readl(&mdio_regs->mdio_status[3]) & 0x80) {
-                printk(KERN_ERR "%s: MII read failed\n", dev->name);
-                return 0;
+#if DEBUG_MDIO
+                printk(KERN_DEBUG "%s #%i: MII read failed\n", bus->name,
+                       phy_id);
+#endif
+                return 0xFFFF; /* don't return error */
         }
 
         return (__raw_readl(&mdio_regs->mdio_status[0]) & 0xFF) |
-                (__raw_readl(&mdio_regs->mdio_status[1]) << 8);
+                ((__raw_readl(&mdio_regs->mdio_status[1]) & 0xFF) << 8);
 }
 
-static int mdio_read(struct net_device *dev, int phy_id, int location)
+static int ixp4xx_mdio_read(struct mii_bus *bus, int phy_id, int location)
 {
         unsigned long flags;
-        u16 val;
+        int ret;
 
         spin_lock_irqsave(&mdio_lock, flags);
-        val = mdio_cmd(dev, phy_id, location, 0, 0);
+        ret = ixp4xx_mdio_cmd(bus, phy_id, location, 0, 0);
         spin_unlock_irqrestore(&mdio_lock, flags);
-        return val;
+#if DEBUG_MDIO
+        printk(KERN_DEBUG "%s #%i: MII read [%i] -> 0x%X\n", bus->name,
+               phy_id, location, ret);
+#endif
+        return ret;
 }
 
-static void mdio_write(struct net_device *dev, int phy_id, int location,
-                       int val)
+static int ixp4xx_mdio_write(struct mii_bus *bus, int phy_id, int location,
+                             u16 val)
 {
         unsigned long flags;
+        int ret;
 
         spin_lock_irqsave(&mdio_lock, flags);
-        mdio_cmd(dev, phy_id, location, 1, val);
+        ret = ixp4xx_mdio_cmd(bus, phy_id, location, 1, val);
         spin_unlock_irqrestore(&mdio_lock, flags);
+#if DEBUG_MDIO
+        printk(KERN_DEBUG "%s #%i: MII read [%i] <- 0x%X, err = %i\n",
+               bus->name, phy_id, location, val, ret);
+#endif
+        return ret;
 }
 
-static void phy_reset(struct net_device *dev, int phy_id)
+static int ixp4xx_mdio_register(void)
 {
-        struct port *port = netdev_priv(dev);
-        int cycles = 0;
+        int err;
+
+        if (!(mdio_bus = mdiobus_alloc()))
+                return -ENOMEM;
 
-        mdio_write(dev, phy_id, MII_BMCR, port->mii_bmcr | BMCR_RESET);
+        /* All MII PHY accesses use NPE-B Ethernet registers */
+        spin_lock_init(&mdio_lock);
+        mdio_regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT;
+        __raw_writel(DEFAULT_CORE_CNTRL, &mdio_regs->core_control);
 
-        while (cycles < MAX_MII_RESET_RETRIES) {
-                if (!(mdio_read(dev, phy_id, MII_BMCR) & BMCR_RESET)) {
-#if DEBUG_MDIO
-                        printk(KERN_DEBUG "%s: phy_reset() took %i cycles\n",
-                               dev->name, cycles);
-#endif
-                        return;
-                }
-                udelay(1);
-                cycles++;
-        }
+        mdio_bus->name = "IXP4xx MII Bus";
+        mdio_bus->read = &ixp4xx_mdio_read;
+        mdio_bus->write = &ixp4xx_mdio_write;
+        strcpy(mdio_bus->id, "0");
 
-        printk(KERN_ERR "%s: MII reset failed\n", dev->name);
+        if ((err = mdiobus_register(mdio_bus)))
+                mdiobus_free(mdio_bus);
+        return err;
 }
 
-static void eth_set_duplex(struct port *port)
+static void ixp4xx_mdio_remove(void)
 {
-        if (port->mii.full_duplex)
-                __raw_writel(DEFAULT_TX_CNTRL0 & ~TX_CNTRL0_HALFDUPLEX,
-                             &port->regs->tx_control[0]);
-        else
-                __raw_writel(DEFAULT_TX_CNTRL0 | TX_CNTRL0_HALFDUPLEX,
-                             &port->regs->tx_control[0]);
+        mdiobus_unregister(mdio_bus);
+        mdiobus_free(mdio_bus);
 }
 
 
-static void phy_check_media(struct port *port, int init)
+static void ixp4xx_adjust_link(struct net_device *dev)
 {
-        if (mii_check_media(&port->mii, 1, init))
-                eth_set_duplex(port);
-        if (port->mii.force_media) { /* mii_check_media() doesn't work */
-                struct net_device *dev = port->netdev;
-                int cur_link = mii_link_ok(&port->mii);
-                int prev_link = netif_carrier_ok(dev);
-
-                if (!prev_link && cur_link) {
-                        printk(KERN_INFO "%s: link up\n", dev->name);
-                        netif_carrier_on(dev);
-                } else if (prev_link && !cur_link) {
+        struct port *port = netdev_priv(dev);
+        struct phy_device *phydev = port->phydev;
+
+        if (!phydev->link) {
+                if (port->speed) {
+                        port->speed = 0;
                         printk(KERN_INFO "%s: link down\n", dev->name);
-                        netif_carrier_off(dev);
                 }
+                return;
         }
-}
 
+        if (port->speed == phydev->speed && port->duplex == phydev->duplex)
+                return;
 
-static void mdio_thread(struct work_struct *work)
-{
-        struct port *port = container_of(work, struct port, mdio_thread.work);
+        port->speed = phydev->speed;
+        port->duplex = phydev->duplex;
 
-        phy_check_media(port, 0);
-        schedule_delayed_work(&port->mdio_thread, MDIO_INTERVAL);
+        if (port->duplex)
+                __raw_writel(DEFAULT_TX_CNTRL0 & ~TX_CNTRL0_HALFDUPLEX,
+                             &port->regs->tx_control[0]);
+        else
+                __raw_writel(DEFAULT_TX_CNTRL0 | TX_CNTRL0_HALFDUPLEX,
+                             &port->regs->tx_control[0]);
+
+        printk(KERN_INFO "%s: link up, speed %u Mb/s, %s duplex\n",
+               dev->name, port->speed, port->duplex ? "full" : "half");
 }
 
 
@@ -777,16 +788,9 @@ static void eth_set_mcast_list(struct net_device *dev)
 
 static int eth_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
 {
-        struct port *port = netdev_priv(dev);
-        unsigned int duplex_chg;
-        int err;
-
         if (!netif_running(dev))
                 return -EINVAL;
-        err = generic_mii_ioctl(&port->mii, if_mii(req), cmd, &duplex_chg);
-        if (duplex_chg)
-                eth_set_duplex(port);
-        return err;
+        return -EINVAL;
 }
 
 
@@ -938,8 +942,6 @@ static int eth_open(struct net_device *dev)
                 }
         }
 
-        mdio_write(dev, port->plat->phy, MII_BMCR, port->mii_bmcr);
-
         memset(&msg, 0, sizeof(msg));
         msg.cmd = NPE_VLAN_SETRXQOSENTRY;
         msg.eth_id = port->id;
@@ -977,6 +979,9 @@ static int eth_open(struct net_device *dev)
                 return err;
         }
 
+        port->speed = 0;        /* force "link up" message */
+        phy_start(port->phydev);
+
         for (i = 0; i < ETH_ALEN; i++)
                 __raw_writel(dev->dev_addr[i], &port->regs->hw_addr[i]);
         __raw_writel(0x08, &port->regs->random_seed);
@@ -1004,10 +1009,8 @@ static int eth_open(struct net_device *dev)
         __raw_writel(DEFAULT_RX_CNTRL0, &port->regs->rx_control[0]);
 
         napi_enable(&port->napi);
-        phy_check_media(port, 1);
         eth_set_mcast_list(dev);
         netif_start_queue(dev);
-        schedule_delayed_work(&port->mdio_thread, MDIO_INTERVAL);
 
         qmgr_set_irq(port->plat->rxq, QUEUE_IRQ_SRC_NOT_EMPTY,
                      eth_rx_irq, dev);
@@ -1098,14 +1101,10 @@ static int eth_close(struct net_device *dev)
                 printk(KERN_CRIT "%s: unable to disable loopback\n",
                        dev->name);
 
-        port->mii_bmcr = mdio_read(dev, port->plat->phy, MII_BMCR) &
-                ~(BMCR_RESET | BMCR_PDOWN); /* may have been altered */
-        mdio_write(dev, port->plat->phy, MII_BMCR,
-                   port->mii_bmcr | BMCR_PDOWN);
+        phy_stop(port->phydev);
 
         if (!ports_open)
                 qmgr_disable_irq(TXDONE_QUEUE);
-        cancel_rearming_delayed_work(&port->mdio_thread);
         destroy_queues(port);
         release_queues(port);
         return 0;
@@ -1117,6 +1116,7 @@ static int __devinit eth_init_one(struct platform_device *pdev)
         struct net_device *dev;
         struct eth_plat_info *plat = pdev->dev.platform_data;
         u32 regs_phys;
+        char phy_id[BUS_ID_SIZE];
         int err;
 
         if (!(dev = alloc_etherdev(sizeof(struct port))))
@@ -1182,22 +1182,19 @@ static int __devinit eth_init_one(struct platform_device *pdev)
         __raw_writel(DEFAULT_CORE_CNTRL, &port->regs->core_control);
         udelay(50);
 
-        port->mii.dev = dev;
-        port->mii.mdio_read = mdio_read;
-        port->mii.mdio_write = mdio_write;
-        port->mii.phy_id = plat->phy;
-        port->mii.phy_id_mask = 0x1F;
-        port->mii.reg_num_mask = 0x1F;
+        snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, "0", plat->phy);
+        port->phydev = phy_connect(dev, phy_id, &ixp4xx_adjust_link, 0,
+                                   PHY_INTERFACE_MODE_MII);
+        if (IS_ERR(port->phydev)) {
+                printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
+                return PTR_ERR(port->phydev);
+        }
+
+        port->phydev->irq = PHY_POLL;
 
         printk(KERN_INFO "%s: MII PHY %i on %s\n", dev->name, plat->phy,
                npe_name(port->npe));
 
-        phy_reset(dev, plat->phy);
-        port->mii_bmcr = mdio_read(dev, plat->phy, MII_BMCR) &
-                ~(BMCR_RESET | BMCR_PDOWN);
-        mdio_write(dev, plat->phy, MII_BMCR, port->mii_bmcr | BMCR_PDOWN);
-
-        INIT_DELAYED_WORK(&port->mdio_thread, mdio_thread);
         return 0;
 
 err_unreg:
@@ -1231,20 +1228,19 @@ static struct platform_driver ixp4xx_eth_driver = {
 
 static int __init eth_init_module(void)
 {
+        int err;
         if (!(ixp4xx_read_feature_bits() & IXP4XX_FEATURE_NPEB_ETH0))
                 return -ENOSYS;
 
-        /* All MII PHY accesses use NPE-B Ethernet registers */
-        spin_lock_init(&mdio_lock);
-        mdio_regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT;
-        __raw_writel(DEFAULT_CORE_CNTRL, &mdio_regs->core_control);
-
+        if ((err = ixp4xx_mdio_register()))
+                return err;
         return platform_driver_register(&ixp4xx_eth_driver);
 }
 
 static void __exit eth_cleanup_module(void)
 {
         platform_driver_unregister(&ixp4xx_eth_driver);
+        ixp4xx_mdio_remove();
 }
 
 MODULE_AUTHOR("Krzysztof Halasa");