ice: register 1588 PTP clock device object for E810 devices

Add a new ice_ptp.c file for holding the basic PTP clock interface
functions. If the device supports PTP, call the new ice_ptp_init and
ice_ptp_release functions where appropriate.

If the function owns the hardware resource associated with the PTP
hardware clock, register with the PTP_1588_CLOCK infrastructure to
allocate a new clock object that represents the device hardware clock.

Implement basic functionality for reading and setting the clock time,
performing clock adjustments, and adjusting the clock frequency.

Future changes will introduce functionality for handling related
features including Tx and Rx timestamps.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
new file mode 100644
index 000000000000..15f2e325bd68
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021, Intel Corporation. */
+
+#ifndef _ICE_PTP_H_
+#define _ICE_PTP_H_
+
+#include <linux/ptp_clock_kernel.h>
+
+#include "ice_ptp_hw.h"
+
+/**
+ * struct ice_ptp - data used for integrating with CONFIG_PTP_1588_CLOCK
+ * @info: structure defining PTP hardware capabilities
+ * @clock: pointer to registered PTP clock device
+ */
+struct ice_ptp {
+	struct ptp_clock_info info;
+	struct ptp_clock *clock;
+};
+
+#define __ptp_info_to_ptp(i) \
+	container_of((i), struct ice_ptp, info)
+#define ptp_info_to_pf(i) \
+	container_of(__ptp_info_to_ptp((i)), struct ice_pf, ptp)
+
+#define PTP_SHARED_CLK_IDX_VALID	BIT(31)
+
+#if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
+struct ice_pf;
+void ice_ptp_init(struct ice_pf *pf);
+void ice_ptp_release(struct ice_pf *pf);
+#else /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
+static inline void ice_ptp_init(struct ice_pf *pf) { }
+static inline void ice_ptp_release(struct ice_pf *pf) { }
+#endif /* IS_ENABLED(CONFIG_PTP_1588_CLOCK) */
+#endif /* _ICE_PTP_H_ */