icssg_stats.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Texas Instruments ICSSG Ethernet driver
 3 *
 4 * Copyright (C) 2018-2021 Texas Instruments Incorporated - https://www.ti.com/
 5 *
 6 */
 7
 8#include "icssg_prueth.h"
 9#include "icssg_stats.h"
10#include <linux/regmap.h>
11
12#define ICSSG_TX_PACKET_OFFSET	0xA0
13#define ICSSG_TX_BYTE_OFFSET	0xEC
14
15static u32 stats_base[] = {	0x54c,	/* Slice 0 stats start */
16				0xb18,	/* Slice 1 stats start */
17};
18
19void emac_update_hardware_stats(struct prueth_emac *emac)
20{
21	struct prueth *prueth = emac->prueth;
22	int slice = prueth_emac_slice(emac);
23	u32 base = stats_base[slice];
24	u32 tx_pkt_cnt = 0;
25	u32 val, reg;
26	int i;
27
28	spin_lock(&prueth->stats_lock);
29
30	for (i = 0; i < ARRAY_SIZE(icssg_all_miig_stats); i++) {
31		/* In MII mode TX lines are swapped inside ICSSG, so read Tx stats
32		 * from slice1 for port0 and slice0 for port1 to get accurate Tx
33		 * stats for a given port
34		 */
35		if (emac->phy_if == PHY_INTERFACE_MODE_MII &&
36		    icssg_all_miig_stats[i].offset >= ICSSG_TX_PACKET_OFFSET &&
37		    icssg_all_miig_stats[i].offset <= ICSSG_TX_BYTE_OFFSET)
38			base = stats_base[slice ^ 1];
39		regmap_read(prueth->miig_rt,
40			    base + icssg_all_miig_stats[i].offset,
41			    &val);
42		regmap_write(prueth->miig_rt,
43			     base + icssg_all_miig_stats[i].offset,
44			     val);
45
46		if (icssg_all_miig_stats[i].offset == ICSSG_TX_PACKET_OFFSET)
47			tx_pkt_cnt = val;
48
49		emac->stats[i] += val;
50		if (icssg_all_miig_stats[i].offset == ICSSG_TX_BYTE_OFFSET)
51			emac->stats[i] -= tx_pkt_cnt * 8;
52	}
53
54	if (prueth->pa_stats) {
55		for (i = 0; i < ARRAY_SIZE(icssg_all_pa_stats); i++) {
56			reg = icssg_all_pa_stats[i].offset +
57			      slice * sizeof(u32);
58			regmap_read(prueth->pa_stats, reg, &val);
59			emac->pa_stats[i] += val;
60		}
61	}
62
63	spin_unlock(&prueth->stats_lock);
64}
65
66void icssg_stats_work_handler(struct work_struct *work)
67{
68	struct prueth_emac *emac = container_of(work, struct prueth_emac,
69						stats_work.work);
70	emac_update_hardware_stats(emac);
71
72	queue_delayed_work(system_long_wq, &emac->stats_work,
73			   msecs_to_jiffies((STATS_TIME_LIMIT_1G_MS * 1000) / emac->speed));
74}
75EXPORT_SYMBOL_GPL(icssg_stats_work_handler);
76
77int emac_get_stat_by_name(struct prueth_emac *emac, char *stat_name)
78{
79	int i;
80
81	for (i = 0; i < ARRAY_SIZE(icssg_all_miig_stats); i++) {
82		if (!strcmp(icssg_all_miig_stats[i].name, stat_name))
83			return emac->stats[icssg_all_miig_stats[i].offset / sizeof(u32)];
84	}
85
86	if (emac->prueth->pa_stats) {
87		for (i = 0; i < ARRAY_SIZE(icssg_all_pa_stats); i++) {
88			if (!strcmp(icssg_all_pa_stats[i].name, stat_name))
89				return emac->pa_stats[i];
90		}
91	}
92
93	netdev_err(emac->ndev, "Invalid stats %s\n", stat_name);
94	return -EINVAL;
95}