ice: Don't check device type when checking GNSS presence

Don't check if the device type is E810T as non-E810T devices can support
GNSS too and PCA9575 check is enough to determine if GNSS is present or
not.

Rename ice_gnss_is_gps_present() to ice_gnss_is_module_present()
because GNSS module supports multiple GNSS providers, not only GPS.

Move functions related to PCA9575 from ice_ptp_hw.c to ice_common.c
to be able to access them when PTP is disabled in the kernel, but GNSS
is enabled.

Remove logical AND with ICE_AQC_LINK_TOPO_NODE_TYPE_M in
ice_get_pca9575_handle(), which has no effect, and reorder device type
checks to check the device_id first, then set other variables.

Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 7a2a2e8da8fa..b61a50fda533 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -5765,6 +5765,96 @@ ice_aq_write_i2c(struct ice_hw *hw, struct ice_aqc_link_topo_addr topo_addr,
 }
 
 /**
+ * ice_get_pca9575_handle - find and return the PCA9575 controller
+ * @hw: pointer to the hw struct
+ * @pca9575_handle: GPIO controller's handle
+ *
+ * Find and return the GPIO controller's handle in the netlist.
+ * When found - the value will be cached in the hw structure and following calls
+ * will return cached value.
+ *
+ * Return: 0 on success, -ENXIO when there's no PCA9575 present.
+ */
+int ice_get_pca9575_handle(struct ice_hw *hw, u16 *pca9575_handle)
+{
+	struct ice_aqc_get_link_topo *cmd;
+	struct ice_aq_desc desc;
+	int err;
+	u8 idx;
+
+	/* If handle was read previously return cached value */
+	if (hw->io_expander_handle) {
+		*pca9575_handle = hw->io_expander_handle;
+		return 0;
+	}
+
+#define SW_PCA9575_SFP_TOPO_IDX		2
+#define SW_PCA9575_QSFP_TOPO_IDX	1
+
+	/* Check if the SW IO expander controlling SMA exists in the netlist. */
+	if (hw->device_id == ICE_DEV_ID_E810C_SFP)
+		idx = SW_PCA9575_SFP_TOPO_IDX;
+	else if (hw->device_id == ICE_DEV_ID_E810C_QSFP)
+		idx = SW_PCA9575_QSFP_TOPO_IDX;
+	else
+		return -ENXIO;
+
+	/* If handle was not detected read it from the netlist */
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_get_link_topo);
+	cmd = &desc.params.get_link_topo;
+	cmd->addr.topo_params.node_type_ctx =
+		ICE_AQC_LINK_TOPO_NODE_TYPE_GPIO_CTRL;
+	cmd->addr.topo_params.index = idx;
+
+	err = ice_aq_send_cmd(hw, &desc, NULL, 0, NULL);
+	if (err)
+		return -ENXIO;
+
+	/* Verify if we found the right IO expander type */
+	if (desc.params.get_link_topo.node_part_num !=
+	    ICE_AQC_GET_LINK_TOPO_NODE_NR_PCA9575)
+		return -ENXIO;
+
+	/* If present save the handle and return it */
+	hw->io_expander_handle =
+		le16_to_cpu(desc.params.get_link_topo.addr.handle);
+	*pca9575_handle = hw->io_expander_handle;
+
+	return 0;
+}
+
+/**
+ * ice_read_pca9575_reg - read the register from the PCA9575 controller
+ * @hw: pointer to the hw struct
+ * @offset: GPIO controller register offset
+ * @data: pointer to data to be read from the GPIO controller
+ *
+ * Return: 0 on success, negative error code otherwise.
+ */
+int ice_read_pca9575_reg(struct ice_hw *hw, u8 offset, u8 *data)
+{
+	struct ice_aqc_link_topo_addr link_topo;
+	__le16 addr;
+	u16 handle;
+	int err;
+
+	memset(&link_topo, 0, sizeof(link_topo));
+
+	err = ice_get_pca9575_handle(hw, &handle);
+	if (err)
+		return err;
+
+	link_topo.handle = cpu_to_le16(handle);
+	link_topo.topo_params.node_type_ctx =
+		FIELD_PREP(ICE_AQC_LINK_TOPO_NODE_CTX_M,
+			   ICE_AQC_LINK_TOPO_NODE_CTX_PROVIDED);
+
+	addr = cpu_to_le16((u16)offset);
+
+	return ice_aq_read_i2c(hw, link_topo, 0, addr, 1, data, NULL);
+}
+
+/**
  * ice_aq_set_gpio
  * @hw: pointer to the hw struct
  * @gpio_ctrl_handle: GPIO controller node handle