gianfar: Fix race in TBI/SerDes configuration

[linux-2.6-omap-h63xx.git] / arch / powerpc / sysdev / fsl_soc.c

diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index 01b884b25696847d6c58817169156c49e49c11e0..26ecb96f9731dec733b23e6368fb3e0f6cf6d629 100644 (file)
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/arch/powerpc/sysdev/fsl_soc.c
@@ -223,6 +223,8 @@ static int gfar_mdio_of_init_one(struct device_node *np)
        if (ret)
                return ret;
 
+       /* The gianfar device will try to use the same ID created below to find
+        * this bus, to coordinate register access (since they share).  */
        mdio_dev = platform_device_register_simple("fsl-gianfar_mdio",
                        res.start&0xfffff, &res, 1);
        if (IS_ERR(mdio_dev))
@@ -394,6 +396,30 @@ static int __init gfar_of_init(void)
                        of_node_put(mdio);
                }
 
+               /* Get MDIO bus controlled by this eTSEC, if any.  Normally only
+                * eTSEC 1 will control an MDIO bus, not necessarily the same
+                * bus that its PHY is on ('mdio' above), so we can't just use
+                * that.  What we do is look for a gianfar mdio device that has
+                * overlapping registers with this device.  That's really the
+                * whole point, to find the device sharing our registers to
+                * coordinate access with it.
+                */
+               for_each_compatible_node(mdio, NULL, "fsl,gianfar-mdio") {
+                       if (of_address_to_resource(mdio, 0, &res))
+                               continue;
+
+                       if (res.start >= r[0].start && res.end <= r[0].end) {
+                               /* Get the ID the mdio bus platform device was
+                                * registered with.  gfar_data.bus_id is
+                                * different because it's for finding a PHY,
+                                * while this is for finding a MII bus.
+                                */
+                               gfar_data.mdio_bus = res.start&0xfffff;
+                               of_node_put(mdio);
+                               break;
+                       }
+               }
+
                ret =
                    platform_device_add_data(gfar_dev, &gfar_data,
                                             sizeof(struct