bnxt_en: Get PTP hardware capability from firmware

Store PTP hardware info in a structure if hardware and firmware support PTP.

Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -49,6 +49,8 @@
 #include <linux/log2.h>
 #include <linux/aer.h>
 #include <linux/bitmap.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/timecounter.h>
 #include <linux/cpu_rmap.h>
 #include <linux/cpumask.h>
 #include <net/pkt_cls.h>
@@ -63,6 +65,7 @@
 #include "bnxt_ethtool.h"
 #include "bnxt_dcb.h"
 #include "bnxt_xdp.h"
+#include "bnxt_ptp.h"
 #include "bnxt_vfr.h"
 #include "bnxt_tc.h"
 #include "bnxt_devlink.h"
@@ -7391,6 +7394,56 @@ int bnxt_hwrm_func_resc_qcaps(struct bnxt *bp, bool all)
 	return rc;
 }
 
+/* bp->hwrm_cmd_lock already held. */
+static int __bnxt_hwrm_ptp_qcfg(struct bnxt *bp)
+{
+	struct hwrm_port_mac_ptp_qcfg_output *resp = bp->hwrm_cmd_resp_addr;
+	struct hwrm_port_mac_ptp_qcfg_input req = {0};
+	struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+	u8 flags;
+	int rc;
+
+	if (bp->hwrm_spec_code < 0x10801) {
+		rc = -ENODEV;
+		goto no_ptp;
+	}
+
+	req.port_id = cpu_to_le16(bp->pf.port_id);
+	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_MAC_PTP_QCFG, -1, -1);
+	rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+	if (rc)
+		goto no_ptp;
+
+	flags = resp->flags;
+	if (!(flags & PORT_MAC_PTP_QCFG_RESP_FLAGS_HWRM_ACCESS)) {
+		rc = -ENODEV;
+		goto no_ptp;
+	}
+	if (!ptp) {
+		ptp = kzalloc(sizeof(*ptp), GFP_KERNEL);
+		if (!ptp)
+			return -ENOMEM;
+		ptp->bp = bp;
+		bp->ptp_cfg = ptp;
+	}
+	if (flags & PORT_MAC_PTP_QCFG_RESP_FLAGS_PARTIAL_DIRECT_ACCESS_REF_CLOCK) {
+		ptp->refclk_regs[0] = le32_to_cpu(resp->ts_ref_clock_reg_lower);
+		ptp->refclk_regs[1] = le32_to_cpu(resp->ts_ref_clock_reg_upper);
+	} else if (bp->flags & BNXT_FLAG_CHIP_P5) {
+		ptp->refclk_regs[0] = BNXT_TS_REG_TIMESYNC_TS0_LOWER;
+		ptp->refclk_regs[1] = BNXT_TS_REG_TIMESYNC_TS0_UPPER;
+	} else {
+		rc = -ENODEV;
+		goto no_ptp;
+	}
+	return 0;
+
+no_ptp:
+	kfree(ptp);
+	bp->ptp_cfg = NULL;
+	return rc;
+}
+
 static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 {
 	int rc = 0;
@@ -7462,6 +7515,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->flags &= ~BNXT_FLAG_WOL_CAP;
 		if (flags & FUNC_QCAPS_RESP_FLAGS_WOL_MAGICPKT_SUPPORTED)
 			bp->flags |= BNXT_FLAG_WOL_CAP;
+		if (flags & FUNC_QCAPS_RESP_FLAGS_PTP_SUPPORTED)
+			__bnxt_hwrm_ptp_qcfg(bp);
 	} else {
 #ifdef CONFIG_BNXT_SRIOV
 		struct bnxt_vf_info *vf = &bp->vf;
@@ -12571,6 +12626,8 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 	bnxt_dcb_free(bp);
 	kfree(bp->edev);
 	bp->edev = NULL;
+	kfree(bp->ptp_cfg);
+	bp->ptp_cfg = NULL;
 	kfree(bp->fw_health);
 	bp->fw_health = NULL;
 	bnxt_cleanup_pci(bp);
@@ -13161,6 +13218,8 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	bnxt_free_hwrm_short_cmd_req(bp);
 	bnxt_free_hwrm_resources(bp);
 	bnxt_ethtool_free(bp);
+	kfree(bp->ptp_cfg);
+	bp->ptp_cfg = NULL;
 	kfree(bp->fw_health);
 	bp->fw_health = NULL;
 	bnxt_cleanup_pci(bp);

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1362,6 +1362,9 @@ struct bnxt_test_info {
 #define BNXT_GRC_REG_CHIP_NUM			0x48
 #define BNXT_GRC_REG_BASE			0x260000
 
+#define BNXT_TS_REG_TIMESYNC_TS0_LOWER		0x640180c
+#define BNXT_TS_REG_TIMESYNC_TS0_UPPER		0x6401810
+
 #define BNXT_GRC_BASE_MASK			0xfffff000
 #define BNXT_GRC_OFFSET_MASK			0x00000ffc
 
@@ -2042,6 +2045,8 @@ struct bnxt {
 
 	struct bpf_prog		*xdp_prog;
 
+	struct bnxt_ptp_cfg	*ptp_cfg;
+
 	/* devlink interface and vf-rep structs */
 	struct devlink		*dl;
 	struct devlink_port	dl_port;

drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h

@@ -0,0 +1,49 @@
+/* Broadcom NetXtreme-C/E network driver.
+ *
+ * Copyright (c) 2021 Broadcom Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef BNXT_PTP_H
+#define BNXT_PTP_H
+
+struct bnxt_ptp_cfg {
+	struct ptp_clock_info	ptp_info;
+	struct ptp_clock	*ptp_clock;
+	struct cyclecounter	cc;
+	struct timecounter	tc;
+	/* serialize timecounter access */
+	spinlock_t		ptp_lock;
+	struct sk_buff		*tx_skb;
+	u64			current_time;
+	u64			old_time;
+	unsigned long		next_period;
+	u16			tx_seqid;
+	struct bnxt		*bp;
+	atomic_t		tx_avail;
+#define BNXT_MAX_TX_TS	1
+	u16			rxctl;
+#define BNXT_PTP_MSG_SYNC			(1 << 0)
+#define BNXT_PTP_MSG_DELAY_REQ			(1 << 1)
+#define BNXT_PTP_MSG_PDELAY_REQ			(1 << 2)
+#define BNXT_PTP_MSG_PDELAY_RESP		(1 << 3)
+#define BNXT_PTP_MSG_FOLLOW_UP			(1 << 8)
+#define BNXT_PTP_MSG_DELAY_RESP			(1 << 9)
+#define BNXT_PTP_MSG_PDELAY_RESP_FOLLOW_UP	(1 << 10)
+#define BNXT_PTP_MSG_ANNOUNCE			(1 << 11)
+#define BNXT_PTP_MSG_SIGNALING			(1 << 12)
+#define BNXT_PTP_MSG_MANAGEMENT			(1 << 13)
+#define BNXT_PTP_MSG_EVENTS		(BNXT_PTP_MSG_SYNC |		\
+					 BNXT_PTP_MSG_DELAY_REQ |	\
+					 BNXT_PTP_MSG_PDELAY_REQ |	\
+					 BNXT_PTP_MSG_PDELAY_RESP)
+	u8			tx_tstamp_en:1;
+	int			rx_filter;
+
+	u32			refclk_regs[2];
+	u32			refclk_mapped_regs[2];
+};
+#endif