ice: Implement PTP support for E830 devices

Add specific functions and definitions for E830 devices to enable
PTP support.

E830 devices support direct write to GLTSYN_ registers without shadow
registers and 64 bit read of PHC time.

Enable PTM for E830 device, which is required for cross timestamp and
and dependency on PCIE_PTM for ICE_HWTS.

Check X86_FEATURE_ART for E830 as it may not be present in the CPU.

Cc: Anna-Maria Behnsen <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Reviewed-by: Przemek Kitszel <[email protected]>
Co-developed-by: Jacob Keller <[email protected]>
Signed-off-by: Jacob Keller <[email protected]>
Co-developed-by: Milena Olech <[email protected]>
Signed-off-by: Milena Olech <[email protected]>
Co-developed-by: Paul Greenwalt <[email protected]>
Signed-off-by: Paul Greenwalt <[email protected]>
Signed-off-by: Michal Michalik <[email protected]>
Co-developed-by: Karol Kolacinski <[email protected]>
Signed-off-by: Karol Kolacinski <[email protected]>
Tested-by: Pucha Himasekhar Reddy <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index c402ab9f3456..b084839eb811 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -4052,8 +4052,7 @@ static void ice_set_pf_caps(struct ice_pf *pf)
 	}
 
 	clear_bit(ICE_FLAG_PTP_SUPPORTED, pf->flags);
-	if (func_caps->common_cap.ieee_1588 &&
-	    !(pf->hw.mac_type == ICE_MAC_E830))
+	if (func_caps->common_cap.ieee_1588)
 		set_bit(ICE_FLAG_PTP_SUPPORTED, pf->flags);
 
 	pf->max_pf_txqs = func_caps->common_cap.num_txq;
@@ -5073,6 +5072,12 @@ static int ice_init(struct ice_pf *pf)
 	if (err)
 		return err;
 
+	if (pf->hw.mac_type == ICE_MAC_E830) {
+		err = pci_enable_ptm(pf->pdev, NULL);
+		if (err)
+			dev_dbg(ice_pf_to_dev(pf), "PCIe PTM not supported by PCIe bus/controller\n");
+	}
+
 	err = ice_alloc_vsis(pf);
 	if (err)
 		goto err_alloc_vsis;