ssb: pci: implement mdio reading

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/ssb/driver_pcicore.c b/drivers/ssb/driver_pcicore.c
index 08fa6fdfc10120878eed385b060ca0afba1749a7..76cbf96001f1200a7587e615670a220bf9f286d7 100644 (file)
--- a/drivers/ssb/driver_pcicore.c
+++ b/drivers/ssb/driver_pcicore.c
@@ -467,6 +467,49 @@ static void ssb_pcie_mdio_set_phy(struct ssb_pcicore *pc, u8 phy)
        }
 }
 
+#if 0
+//done but not used yet
+static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address)
+{
+       const u16 mdio_control = 0x128;
+       const u16 mdio_data = 0x12C;
+       int max_retries = 10;
+       u16 ret = 0;
+       u32 v;
+       int i;
+
+       v = 0x80; /* Enable Preamble Sequence */
+       v |= 0x2; /* MDIO Clock Divisor */
+       pcicore_write32(pc, mdio_control, v);
+
+       if (pc->dev->id.revision >= 10) {
+               max_retries = 200;
+               ssb_pcie_mdio_set_phy(pc, device);
+       }
+
+       v = (1 << 30); /* Start of Transaction */
+       v |= (1 << 29); /* Read Transaction */
+       v |= (1 << 17); /* Turnaround */
+       if (pc->dev->id.revision < 10)
+               v |= (u32)device << 22;
+       v |= (u32)address << 18;
+       pcicore_write32(pc, mdio_data, v);
+       /* Wait for the device to complete the transaction */
+       udelay(10);
+       for (i = 0; i < 200; i++) {
+               v = pcicore_read32(pc, mdio_control);
+               if (v & 0x100 /* Trans complete */) {
+                       udelay(10);
+                       ret = pcicore_read32(pc, mdio_data);
+                       break;
+               }
+               msleep(1);
+       }
+       pcicore_write32(pc, mdio_control, 0);
+       return ret;
+}
+#endif
+
 static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
                                u8 address, u16 data)
 {