1// SPDX-License-Identifier: GPL-2.0
2/* ICSSG Buffer queue helpers
3 *
4 * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com
5 */
6
7#include <linux/regmap.h>
8#include "icssg_prueth.h"
9
10#define ICSSG_QUEUES_MAX 64
11#define ICSSG_QUEUE_OFFSET 0xd00
12#define ICSSG_QUEUE_PEEK_OFFSET 0xe00
13#define ICSSG_QUEUE_CNT_OFFSET 0xe40
14#define ICSSG_QUEUE_RESET_OFFSET 0xf40
15
16int icssg_queue_pop(struct prueth *prueth, u8 queue)
17{
18 u32 val, cnt;
19
20 if (queue >= ICSSG_QUEUES_MAX)
21 return -EINVAL;
22
23 regmap_read(map: prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, val: &cnt);
24 if (!cnt)
25 return -EINVAL;
26
27 regmap_read(map: prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, val: &val);
28
29 return val;
30}
31
32void icssg_queue_push(struct prueth *prueth, int queue, u16 addr)
33{
34 if (queue >= ICSSG_QUEUES_MAX)
35 return;
36
37 regmap_write(map: prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, val: addr);
38}
39
40u32 icssg_queue_level(struct prueth *prueth, int queue)
41{
42 u32 reg;
43
44 if (queue >= ICSSG_QUEUES_MAX)
45 return 0;
46
47 regmap_read(map: prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, val: &reg);
48
49 return reg;
50}
51

source code of linux/drivers/net/ethernet/ti/icssg/icssg_queues.c