[PATCH] AT91RM9200 Ethernet #1: Link poll

For Ethernet PHYs that don't have an IRQ pin or boards that don't
connect the IRQ pin to the processor, we enable a timer to poll the
PHY's link state.

Patch originally supplied by Eric Benard and Roman Kolesnikov.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 43 insertions, 18 deletions

diff --git a/drivers/net/arm/at91_ether.c b/drivers/net/arm/at91_ether.c
index 5503dc8a66e4..5b5095629a93 100644
--- a/drivers/net/arm/at91_ether.c
+++ b/drivers/net/arm/at91_ether.c
@@ -45,6 +45,9 @@
 static struct net_device *at91_dev;
 static struct clk *ether_clk;
 
+static struct timer_list check_timer;
+#define LINK_POLL_INTERVAL      (HZ)
+
 /* ..................................................................... */
 
 /*
@@ -143,7 +146,7 @@ static void read_phy(unsigned char phy_addr, unsigned char address, unsigned int
  * MAC accordingly.
  * If no link or auto-negotiation is busy, then no changes are made.
  */
-static void update_linkspeed(struct net_device *dev)
+static void update_linkspeed(struct net_device *dev, int silent)
 {
         struct at91_private *lp = (struct at91_private *) dev->priv;
         unsigned int bmsr, bmcr, lpa, mac_cfg;
@@ -151,7 +154,8 @@ static void update_linkspeed(struct net_device *dev)
 
         if (!mii_link_ok(&lp->mii)) {           /* no link */
                 netif_carrier_off(dev);
-                printk(KERN_INFO "%s: Link down.\n", dev->name);
+                if (!silent)
+                        printk(KERN_INFO "%s: Link down.\n", dev->name);
                 return;
         }
 
@@ -186,7 +190,8 @@ static void update_linkspeed(struct net_device *dev)
         }
         at91_emac_write(AT91_EMAC_CFG, mac_cfg);
 
-        printk(KERN_INFO "%s: Link now %i-%s\n", dev->name, speed, (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
+        if (!silent)
+                printk(KERN_INFO "%s: Link now %i-%s\n", dev->name, speed, (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
         netif_carrier_on(dev);
 }
 
@@ -226,7 +231,7 @@ static irqreturn_t at91ether_phy_interrupt(int irq, void *dev_id, struct pt_regs
                         goto done;
         }
 
-        update_linkspeed(dev);
+        update_linkspeed(dev, 0);
 
 done:
         disable_mdi();
@@ -243,14 +248,17 @@ static void enable_phyirq(struct net_device *dev)
         unsigned int dsintr, irq_number;
         int status;
 
-        if (lp->phy_type == MII_RTL8201_ID)     /* RTL8201 does not have an interrupt */
-                return;
-        if (lp->phy_type == MII_DP83847_ID)     /* DP83847 does not have an interrupt */
-                return;
-        if (lp->phy_type == MII_AC101L_ID)      /* AC101L interrupt not supported yet */
+        irq_number = lp->board_data.phy_irq_pin;
+        if (!irq_number) {
+                /*
+                 * PHY doesn't have an IRQ pin (RTL8201, DP83847, AC101L),
+                 * or board does not have it connected.
+                 */
+                check_timer.expires = jiffies + LINK_POLL_INTERVAL;
+                add_timer(&check_timer);
                 return;
+        }
 
-        irq_number = lp->board_data.phy_irq_pin;
         status = request_irq(irq_number, at91ether_phy_interrupt, 0, dev->name, dev);
         if (status) {
                 printk(KERN_ERR "at91_ether: PHY IRQ %d request failed - status %d!\n", irq_number, status);
@@ -292,12 +300,11 @@ static void disable_phyirq(struct net_device *dev)
         unsigned int dsintr;
         unsigned int irq_number;
 
-        if (lp->phy_type == MII_RTL8201_ID)     /* RTL8201 does not have an interrupt */
-                return;
-        if (lp->phy_type == MII_DP83847_ID)     /* DP83847 does not have an interrupt */
-                return;
-        if (lp->phy_type == MII_AC101L_ID)      /* AC101L interrupt not supported yet */
+        irq_number = lp->board_data.phy_irq_pin;
+        if (!irq_number) {
+                del_timer_sync(&check_timer);
                 return;
+        }
 
         spin_lock_irq(&lp->lock);
         enable_mdi();
@@ -326,7 +333,6 @@ static void disable_phyirq(struct net_device *dev)
         disable_mdi();
         spin_unlock_irq(&lp->lock);
 
-        irq_number = lp->board_data.phy_irq_pin;
         free_irq(irq_number, dev);                      /* Free interrupt handler */
 }
 
@@ -355,6 +361,18 @@ static void reset_phy(struct net_device *dev)
 }
 #endif
 
+static void at91ether_check_link(unsigned long dev_id)
+{
+        struct net_device *dev = (struct net_device *) dev_id;
+
+        enable_mdi();
+        update_linkspeed(dev, 1);
+        disable_mdi();
+
+        check_timer.expires = jiffies + LINK_POLL_INTERVAL;
+        add_timer(&check_timer);
+}
+
 /* ......................... ADDRESS MANAGEMENT ........................ */
 
 /*
@@ -708,7 +726,7 @@ static int at91ether_open(struct net_device *dev)
         /* Determine current link speed */
         spin_lock_irq(&lp->lock);
         enable_mdi();
-        update_linkspeed(dev);
+        update_linkspeed(dev, 0);
         disable_mdi();
         spin_unlock_irq(&lp->lock);
 
@@ -992,11 +1010,18 @@ static int __init at91ether_setup(unsigned long phy_type, unsigned short phy_add
         /* Determine current link speed */
         spin_lock_irq(&lp->lock);
         enable_mdi();
-        update_linkspeed(dev);
+        update_linkspeed(dev, 0);
         disable_mdi();
         spin_unlock_irq(&lp->lock);
         netif_carrier_off(dev);         /* will be enabled in open() */
 
+        /* If board has no PHY IRQ, use a timer to poll the PHY */
+        if (!lp->board_data.phy_irq_pin) {
+                init_timer(&check_timer);
+                check_timer.data = (unsigned long)dev;
+                check_timer.function = at91ether_check_link;
+        }
+
         /* Display ethernet banner */
         printk(KERN_INFO "%s: AT91 ethernet at 0x%08x int=%d %s%s (%02x:%02x:%02x:%02x:%02x:%02x)\n",
                 dev->name, (uint) dev->base_addr, dev->irq,