fm10k: Add support for basic interaction with hardware
This patch adds the basic read/write operations for accessing the hardware.
In addition to read read functionality the read functions also provide
surprise remove detection in the event that the device either loses power
or is removed.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index 12089ce..6d5e33c 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -38,6 +38,36 @@
};
MODULE_DEVICE_TABLE(pci, fm10k_pci_tbl);
+u16 fm10k_read_pci_cfg_word(struct fm10k_hw *hw, u32 reg)
+{
+ struct fm10k_intfc *interface = hw->back;
+ u16 value = 0;
+
+ if (FM10K_REMOVED(hw->hw_addr))
+ return ~value;
+
+ pci_read_config_word(interface->pdev, reg, &value);
+ if (value == 0xFFFF)
+ fm10k_write_flush(hw);
+
+ return value;
+}
+
+u32 fm10k_read_reg(struct fm10k_hw *hw, int reg)
+{
+ u32 __iomem *hw_addr = ACCESS_ONCE(hw->hw_addr);
+ u32 value = 0;
+
+ if (FM10K_REMOVED(hw_addr))
+ return ~value;
+
+ value = readl(&hw_addr[reg]);
+ if (!(~value) && (!reg || !(~readl(hw_addr))))
+ hw->hw_addr = NULL;
+
+ return value;
+}
+
/**
* fm10k_probe - Device Initialization Routine
* @pdev: PCI device information struct