1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-pps.c b/drivers/net/ethernet/amd/xgbe/xgbe-pps.c
new file mode 100644
index 000000000000..6d03ae7ab36f
--- /dev/null
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-pps.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
+/*
+ * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
+ * Copyright (c) 2014, Synopsys, Inc.
+ * All rights reserved
+ *
+ * Author: Raju Rangoju <Raju.Rangoju@amd.com>
+ */
+
+#include "xgbe.h"
+#include "xgbe-common.h"
+
+static u32 get_pps_mask(unsigned int x)
+{
+	return GENMASK(PPS_MAXIDX(x), PPS_MINIDX(x));
+}
+
+static u32 get_pps_cmd(unsigned int x, u32 val)
+{
+	return (val & GENMASK(3, 0)) << PPS_MINIDX(x);
+}
+
+static u32 get_target_mode_sel(unsigned int x, u32 val)
+{
+	return (val & GENMASK(1, 0)) << (PPS_MAXIDX(x) - 2);
+}
+
+int xgbe_pps_config(struct xgbe_prv_data *pdata,
+		    struct xgbe_pps_config *cfg, int index, bool on)
+{
+	unsigned int ppscr = 0;
+	unsigned int tnsec;
+	u64 period;
+
+	/* Check if target time register is busy */
+	tnsec = XGMAC_IOREAD(pdata, MAC_PPSx_TTNSR(index));
+	if (XGMAC_GET_BITS(tnsec, MAC_PPSx_TTNSR, TRGTBUSY0))
+		return -EBUSY;
+
+	ppscr = XGMAC_IOREAD(pdata, MAC_PPSCR);
+	ppscr &= ~get_pps_mask(index);
+
+	if (!on) {
+		/* Disable PPS output */
+		ppscr |= get_pps_cmd(index, XGBE_PPSCMD_STOP);
+		ppscr |= PPSEN0;
+		XGMAC_IOWRITE(pdata, MAC_PPSCR, ppscr);
+
+		return 0;
+	}
+
+	/* Configure start time */
+	XGMAC_IOWRITE(pdata, MAC_PPSx_TTSR(index), cfg->start.tv_sec);
+	XGMAC_IOWRITE(pdata, MAC_PPSx_TTNSR(index), cfg->start.tv_nsec);
+
+	period = cfg->period.tv_sec * NSEC_PER_SEC + cfg->period.tv_nsec;
+	period = div_u64(period, XGBE_V2_TSTAMP_SSINC);
+
+	if (period < 4)
+		return -EINVAL;
+
+	/* Configure interval and pulse width (50% duty cycle) */
+	XGMAC_IOWRITE(pdata, MAC_PPSx_INTERVAL(index), period - 1);
+	XGMAC_IOWRITE(pdata, MAC_PPSx_WIDTH(index), (period >> 1) - 1);
+
+	/* Enable PPS with pulse train mode */
+	ppscr |= get_pps_cmd(index, XGBE_PPSCMD_START);
+	ppscr |= get_target_mode_sel(index, XGBE_PPSTARGET_PULSE);
+	ppscr |= PPSEN0;
+
+	XGMAC_IOWRITE(pdata, MAC_PPSCR, ppscr);
+
+	return 0;
+}