e1000: add PCI-E capability detection code
Add code to display the detected PCI-E bus width.
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index fd30161..e261578 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -4473,6 +4473,22 @@
pci_write_config_word(adapter->pdev, reg, *value);
}
+int32_t
+e1000_read_pcie_cap_reg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
+{
+ struct e1000_adapter *adapter = hw->back;
+ uint16_t cap_offset;
+
+ cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
+ if (!cap_offset)
+ return -E1000_ERR_CONFIG;
+
+ pci_read_config_word(adapter->pdev, cap_offset + reg, value);
+
+ return E1000_SUCCESS;
+}
+
+
void
e1000_io_write(struct e1000_hw *hw, unsigned long port, uint32_t value)
{