1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
4 */
5
6#ifndef IXP4XX_QMGR_H
7#define IXP4XX_QMGR_H
8
9#include <linux/io.h>
10#include <linux/kernel.h>
11
12#define DEBUG_QMGR 0
13
14#define HALF_QUEUES 32
15#define QUEUES 64
16#define MAX_QUEUE_LENGTH 4 /* in dwords */
17
18#define QUEUE_STAT1_EMPTY 1 /* queue status bits */
19#define QUEUE_STAT1_NEARLY_EMPTY 2
20#define QUEUE_STAT1_NEARLY_FULL 4
21#define QUEUE_STAT1_FULL 8
22#define QUEUE_STAT2_UNDERFLOW 1
23#define QUEUE_STAT2_OVERFLOW 2
24
25#define QUEUE_WATERMARK_0_ENTRIES 0
26#define QUEUE_WATERMARK_1_ENTRY 1
27#define QUEUE_WATERMARK_2_ENTRIES 2
28#define QUEUE_WATERMARK_4_ENTRIES 3
29#define QUEUE_WATERMARK_8_ENTRIES 4
30#define QUEUE_WATERMARK_16_ENTRIES 5
31#define QUEUE_WATERMARK_32_ENTRIES 6
32#define QUEUE_WATERMARK_64_ENTRIES 7
33
34/* queue interrupt request conditions */
35#define QUEUE_IRQ_SRC_EMPTY 0
36#define QUEUE_IRQ_SRC_NEARLY_EMPTY 1
37#define QUEUE_IRQ_SRC_NEARLY_FULL 2
38#define QUEUE_IRQ_SRC_FULL 3
39#define QUEUE_IRQ_SRC_NOT_EMPTY 4
40#define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY 5
41#define QUEUE_IRQ_SRC_NOT_NEARLY_FULL 6
42#define QUEUE_IRQ_SRC_NOT_FULL 7
43
44struct qmgr_regs {
45 u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
46 u32 stat1[4]; /* 0x400 - 0x40F */
47 u32 stat2[2]; /* 0x410 - 0x417 */
48 u32 statne_h; /* 0x418 - queue nearly empty */
49 u32 statf_h; /* 0x41C - queue full */
50 u32 irqsrc[4]; /* 0x420 - 0x42F IRC source */
51 u32 irqen[2]; /* 0x430 - 0x437 IRQ enabled */
52 u32 irqstat[2]; /* 0x438 - 0x43F - IRQ access only */
53 u32 reserved[1776];
54 u32 sram[2048]; /* 0x2000 - 0x3FFF - config and buffer */
55};
56
57void qmgr_put_entry(unsigned int queue, u32 val);
58u32 qmgr_get_entry(unsigned int queue);
59int qmgr_stat_empty(unsigned int queue);
60int qmgr_stat_below_low_watermark(unsigned int queue);
61int qmgr_stat_full(unsigned int queue);
62int qmgr_stat_overflow(unsigned int queue);
63void qmgr_release_queue(unsigned int queue);
64void qmgr_set_irq(unsigned int queue, int src,
65 void (*handler)(void *pdev), void *pdev);
66void qmgr_enable_irq(unsigned int queue);
67void qmgr_disable_irq(unsigned int queue);
68
69/* request_ and release_queue() must be called from non-IRQ context */
70
71#if DEBUG_QMGR
72extern char qmgr_queue_descs[QUEUES][32];
73
74int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
75 unsigned int nearly_empty_watermark,
76 unsigned int nearly_full_watermark,
77 const char *desc_format, const char* name);
78#else
79int __qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
80 unsigned int nearly_empty_watermark,
81 unsigned int nearly_full_watermark);
82#define qmgr_request_queue(queue, len, nearly_empty_watermark, \
83 nearly_full_watermark, desc_format, name) \
84 __qmgr_request_queue(queue, len, nearly_empty_watermark, \
85 nearly_full_watermark)
86#endif
87
88#endif
89

source code of linux/include/linux/soc/ixp4xx/qmgr.h