1 /*
2 * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License
6 * as published by the Free Software Foundation.
7 */
8
9 #ifndef IXP4XX_QMGR_H
10 #define IXP4XX_QMGR_H
11
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14
15 #define HALF_QUEUES 32
16 #define QUEUES 64 /* only 32 lower queues currently supported */
17 #define MAX_QUEUE_LENGTH 4 /* in dwords */
18
19 #define QUEUE_STAT1_EMPTY 1 /* queue status bits */
20 #define QUEUE_STAT1_NEARLY_EMPTY 2
21 #define QUEUE_STAT1_NEARLY_FULL 4
22 #define QUEUE_STAT1_FULL 8
23 #define QUEUE_STAT2_UNDERFLOW 1
24 #define QUEUE_STAT2_OVERFLOW 2
25
26 #define QUEUE_WATERMARK_0_ENTRIES 0
27 #define QUEUE_WATERMARK_1_ENTRY 1
28 #define QUEUE_WATERMARK_2_ENTRIES 2
29 #define QUEUE_WATERMARK_4_ENTRIES 3
30 #define QUEUE_WATERMARK_8_ENTRIES 4
31 #define QUEUE_WATERMARK_16_ENTRIES 5
32 #define QUEUE_WATERMARK_32_ENTRIES 6
33 #define QUEUE_WATERMARK_64_ENTRIES 7
34
35 /* queue interrupt request conditions */
36 #define QUEUE_IRQ_SRC_EMPTY 0
37 #define QUEUE_IRQ_SRC_NEARLY_EMPTY 1
38 #define QUEUE_IRQ_SRC_NEARLY_FULL 2
39 #define QUEUE_IRQ_SRC_FULL 3
40 #define QUEUE_IRQ_SRC_NOT_EMPTY 4
41 #define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY 5
42 #define QUEUE_IRQ_SRC_NOT_NEARLY_FULL 6
43 #define QUEUE_IRQ_SRC_NOT_FULL 7
44
45 struct qmgr_regs {
46 u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
47 u32 stat1[4]; /* 0x400 - 0x40F */
48 u32 stat2[2]; /* 0x410 - 0x417 */
49 u32 statne_h; /* 0x418 - queue nearly empty */
50 u32 statf_h; /* 0x41C - queue full */
51 u32 irqsrc[4]; /* 0x420 - 0x42F IRC source */
52 u32 irqen[2]; /* 0x430 - 0x437 IRQ enabled */
53 u32 irqstat[2]; /* 0x438 - 0x43F - IRQ access only */
54 u32 reserved[1776];
55 u32 sram[2048]; /* 0x2000 - 0x3FFF - config and buffer */
56 };
57
58 void qmgr_set_irq(unsigned int queue, int src,
59 void (*handler)(void *pdev), void *pdev);
60 void qmgr_enable_irq(unsigned int queue);
61 void qmgr_disable_irq(unsigned int queue);
62
63 /* request_ and release_queue() must be called from non-IRQ context */
64 int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
65 unsigned int nearly_empty_watermark,
66 unsigned int nearly_full_watermark);
67 void qmgr_release_queue(unsigned int queue);
68
69
70 static inline void qmgr_put_entry(unsigned int queue, u32 val)
71 {
72 extern struct qmgr_regs __iomem *qmgr_regs;
73 __raw_writel(val, &qmgr_regs->acc[queue][0]);
74 }
75
76 static inline u32 qmgr_get_entry(unsigned int queue)
77 {
78 extern struct qmgr_regs __iomem *qmgr_regs;
79 return __raw_readl(&qmgr_regs->acc[queue][0]);
80 }
81
82 static inline int qmgr_get_stat1(unsigned int queue)
83 {
84 extern struct qmgr_regs __iomem *qmgr_regs;
85 return (__raw_readl(&qmgr_regs->stat1[queue >> 3])
86 >> ((queue & 7) << 2)) & 0xF;
87 }
88
89 static inline int qmgr_get_stat2(unsigned int queue)
90 {
91 extern struct qmgr_regs __iomem *qmgr_regs;
92 return (__raw_readl(&qmgr_regs->stat2[queue >> 4])
93 >> ((queue & 0xF) << 1)) & 0x3;
94 }
95
96 static inline int qmgr_stat_empty(unsigned int queue)
97 {
98 return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_EMPTY);
99 }
100
101 static inline int qmgr_stat_nearly_empty(unsigned int queue)
102 {
103 return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_EMPTY);
104 }
105
106 static inline int qmgr_stat_nearly_full(unsigned int queue)
107 {
108 return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_FULL);
109 }
110
111 static inline int qmgr_stat_full(unsigned int queue)
112 {
113 return !!(qmgr_get_stat1(queue) & QUEUE_STAT1_FULL);
114 }
115
116 static inline int qmgr_stat_underflow(unsigned int queue)
117 {
118 return !!(qmgr_get_stat2(queue) & QUEUE_STAT2_UNDERFLOW);
119 }
120
121 static inline int qmgr_stat_overflow(unsigned int queue)
122 {
123 return !!(qmgr_get_stat2(queue) & QUEUE_STAT2_OVERFLOW);
124 }
125
126 #endif
127
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