icssg_queues.c

 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(prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, &cnt);
24	if (!cnt)
25		return -EINVAL;
26
27	regmap_read(prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, &val);
28
29	return val;
30}
31EXPORT_SYMBOL_GPL(icssg_queue_pop);
32
33void icssg_queue_push(struct prueth *prueth, int queue, u16 addr)
34{
35	if (queue >= ICSSG_QUEUES_MAX)
36		return;
37
38	regmap_write(prueth->miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue, addr);
39}
40EXPORT_SYMBOL_GPL(icssg_queue_push);
41
42u32 icssg_queue_level(struct prueth *prueth, int queue)
43{
44	u32 reg;
45
46	if (queue >= ICSSG_QUEUES_MAX)
47		return 0;
48
49	regmap_read(prueth->miig_rt, ICSSG_QUEUE_CNT_OFFSET + 4 * queue, &reg);
50
51	return reg;
52}