ice: Read SDP section from NVM for pin definitions

PTP pins assignment and their related SDPs (Software Definable Pins) are
currently hardcoded.
Fix that by reading NVM section instead on products supporting this,
which are E810 products.
If SDP section is not defined in NVM, the driver continues to use the
hardcoded table.

Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Yochai Hagvi <yochai.hagvi@intel.com>
Co-developed-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
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, 60 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c b/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
index 3c314f3d8107..07ecf2a86742 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp_hw.c
@@ -5314,6 +5314,66 @@ int ice_read_pca9575_reg(struct ice_hw *hw, u8 offset, u8 *data)
 }
 
 /**
+ * ice_ptp_read_sdp_ac - read SDP available connections section from NVM
+ * @hw: pointer to the HW struct
+ * @entries: returns the SDP available connections section from NVM
+ * @num_entries: returns the number of valid entries
+ *
+ * Return: 0 on success, negative error code if NVM read failed or section does
+ * not exist or is corrupted
+ */
+int ice_ptp_read_sdp_ac(struct ice_hw *hw, __le16 *entries, uint *num_entries)
+{
+	__le16 data;
+	u32 offset;
+	int err;
+
+	err = ice_acquire_nvm(hw, ICE_RES_READ);
+	if (err)
+		goto exit;
+
+	/* Read the offset of SDP_AC */
+	offset = ICE_AQC_NVM_SDP_AC_PTR_OFFSET;
+	err = ice_aq_read_nvm(hw, 0, offset, sizeof(data), &data, false, true,
+			      NULL);
+	if (err)
+		goto exit;
+
+	/* Check if section exist */
+	offset = FIELD_GET(ICE_AQC_NVM_SDP_AC_PTR_M, le16_to_cpu(data));
+	if (offset == ICE_AQC_NVM_SDP_AC_PTR_INVAL) {
+		err = -EINVAL;
+		goto exit;
+	}
+
+	if (offset & ICE_AQC_NVM_SDP_AC_PTR_TYPE_M) {
+		offset &= ICE_AQC_NVM_SDP_AC_PTR_M;
+		offset *= ICE_AQC_NVM_SECTOR_UNIT;
+	} else {
+		offset *= sizeof(data);
+	}
+
+	/* Skip reading section length and read the number of valid entries */
+	offset += sizeof(data);
+	err = ice_aq_read_nvm(hw, 0, offset, sizeof(data), &data, false, true,
+			      NULL);
+	if (err)
+		goto exit;
+	*num_entries = le16_to_cpu(data);
+
+	/* Read SDP configuration section */
+	offset += sizeof(data);
+	err = ice_aq_read_nvm(hw, 0, offset, *num_entries * sizeof(data),
+			      entries, false, true, NULL);
+
+exit:
+	if (err)
+		dev_dbg(ice_hw_to_dev(hw), "Failed to configure SDP connection section\n");
+	ice_release_nvm(hw);
+	return err;
+}
+
+/**
  * ice_ptp_init_phy_e810 - initialize PHY parameters
  * @ptp: pointer to the PTP HW struct
  */