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 
15 static u32 stats_base[] = {	0x54c,	/* Slice 0 stats start */
16 				0xb18,	/* Slice 1 stats start */
17 };
18 
19 void 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;
26 	int i;
27 
28 	for (i = 0; i < ARRAY_SIZE(icssg_all_stats); i++) {
29 		regmap_read(prueth->miig_rt,
30 			    base + icssg_all_stats[i].offset,
31 			    &val);
32 		regmap_write(prueth->miig_rt,
33 			     base + icssg_all_stats[i].offset,
34 			     val);
35 
36 		if (icssg_all_stats[i].offset == ICSSG_TX_PACKET_OFFSET)
37 			tx_pkt_cnt = val;
38 
39 		emac->stats[i] += val;
40 		if (icssg_all_stats[i].offset == ICSSG_TX_BYTE_OFFSET)
41 			emac->stats[i] -= tx_pkt_cnt * 8;
42 	}
43 }
44 
45 void emac_stats_work_handler(struct work_struct *work)
46 {
47 	struct prueth_emac *emac = container_of(work, struct prueth_emac,
48 						stats_work.work);
49 	emac_update_hardware_stats(emac);
50 
51 	queue_delayed_work(system_long_wq, &emac->stats_work,
52 			   msecs_to_jiffies((STATS_TIME_LIMIT_1G_MS * 1000) / emac->speed));
53 }
54 
55 int emac_get_stat_by_name(struct prueth_emac *emac, char *stat_name)
56 {
57 	int i;
58 
59 	for (i = 0; i < ARRAY_SIZE(icssg_all_stats); i++) {
60 		if (!strcmp(icssg_all_stats[i].name, stat_name))
61 			return emac->stats[icssg_all_stats[i].offset / sizeof(u32)];
62 	}
63 
64 	netdev_err(emac->ndev, "Invalid stats %s\n", stat_name);
65 	return -EINVAL;
66 }
67