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 08fa6fd..76cbf96 100644
--- a/drivers/ssb/driver_pcicore.c
+++ b/drivers/ssb/driver_pcicore.c
@@ -467,6 +467,49 @@
}
}
+#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)
{