igc: Add support for PF

This patch adds the basic defines and structures needed by the PF for
operation. With this it is possible to bring up the interface,
but without being able to configure any of the filters on
the interface itself.
Add skeleton for a function pointers.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 753749ce5ae0..6a881753f5ce 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -30,6 +30,69 @@ static const struct pci_device_id igc_pci_tbl[] = {
 
 MODULE_DEVICE_TABLE(pci, igc_pci_tbl);
 
+/* forward declaration */
+static int igc_sw_init(struct igc_adapter *);
+
+/* PCIe configuration access */
+void igc_read_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value)
+{
+	struct igc_adapter *adapter = hw->back;
+
+	pci_read_config_word(adapter->pdev, reg, value);
+}
+
+void igc_write_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value)
+{
+	struct igc_adapter *adapter = hw->back;
+
+	pci_write_config_word(adapter->pdev, reg, *value);
+}
+
+s32 igc_read_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value)
+{
+	struct igc_adapter *adapter = hw->back;
+	u16 cap_offset;
+
+	cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
+	if (!cap_offset)
+		return -IGC_ERR_CONFIG;
+
+	pci_read_config_word(adapter->pdev, cap_offset + reg, value);
+
+	return IGC_SUCCESS;
+}
+
+s32 igc_write_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value)
+{
+	struct igc_adapter *adapter = hw->back;
+	u16 cap_offset;
+
+	cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
+	if (!cap_offset)
+		return -IGC_ERR_CONFIG;
+
+	pci_write_config_word(adapter->pdev, cap_offset + reg, *value);
+
+	return IGC_SUCCESS;
+}
+
+u32 igc_rd32(struct igc_hw *hw, u32 reg)
+{
+	u8 __iomem *hw_addr = READ_ONCE(hw->hw_addr);
+	u32 value = 0;
+
+	if (IGC_REMOVED(hw_addr))
+		return ~value;
+
+	value = readl(&hw_addr[reg]);
+
+	/* reads should not return all F's */
+	if (!(~value) && (!reg || !(~readl(hw_addr))))
+		hw->hw_addr = NULL;
+
+	return value;
+}
+
 /**
  * igc_probe - Device Initialization Routine
  * @pdev: PCI device information struct
@@ -44,6 +107,7 @@ MODULE_DEVICE_TABLE(pci, igc_pci_tbl);
 static int igc_probe(struct pci_dev *pdev,
 		     const struct pci_device_id *ent)
 {
+	struct igc_adapter *adapter;
 	int err, pci_using_dac;
 
 	err = pci_enable_device_mem(pdev);
@@ -78,8 +142,15 @@ static int igc_probe(struct pci_dev *pdev,
 
 	pci_set_master(pdev);
 	err = pci_save_state(pdev);
+
+	/* setup the private structure */
+	err = igc_sw_init(adapter);
+	if (err)
+		goto err_sw_init;
+
 	return 0;
 
+err_sw_init:
 err_pci_reg:
 err_dma:
 	pci_disable_device(pdev);
@@ -111,6 +182,33 @@ static struct pci_driver igc_driver = {
 };
 
 /**
+ * igc_sw_init - Initialize general software structures (struct igc_adapter)
+ * @adapter: board private structure to initialize
+ *
+ * igc_sw_init initializes the Adapter private data structure.
+ * Fields are initialized based on PCI device information and
+ * OS network device settings (MTU size).
+ */
+static int igc_sw_init(struct igc_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct igc_hw *hw = &adapter->hw;
+
+	/* PCI config space info */
+
+	hw->vendor_id = pdev->vendor;
+	hw->device_id = pdev->device;
+	hw->subsystem_vendor_id = pdev->subsystem_vendor;
+	hw->subsystem_device_id = pdev->subsystem_device;
+
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);
+
+	pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
+
+	return 0;
+}
+
+/**
  * igc_init_module - Driver Registration Routine
  *
  * igc_init_module is the first routine called when the driver is