1 /*
2 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
3 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #ifndef _C2_MQ_H_
35 #define _C2_MQ_H_
36 #include <linux/kernel.h>
37 #include <linux/dma-mapping.h>
38 #include "c2_wr.h"
39
40 enum c2_shared_regs {
41
42 C2_SHARED_ARMED = 0x10,
43 C2_SHARED_NOTIFY = 0x18,
44 C2_SHARED_SHARED = 0x40,
45 };
46
47 struct c2_mq_shared {
48 u16 unused1;
49 u8 armed;
50 u8 notification_type;
51 u32 unused2;
52 u16 shared;
53 /* Pad to 64 bytes. */
54 u8 pad[64 - sizeof(u16) - 2 * sizeof(u8) - sizeof(u32) - sizeof(u16)];
55 };
56
57 enum c2_mq_type {
58 C2_MQ_HOST_TARGET = 1,
59 C2_MQ_ADAPTER_TARGET = 2,
60 };
61
62 /*
63 * c2_mq_t is for kernel-mode MQs like the VQs Cand the AEQ.
64 * c2_user_mq_t (which is the same format) is for user-mode MQs...
65 */
66 #define C2_MQ_MAGIC 0x4d512020 /* 'MQ ' */
67 struct c2_mq {
68 u32 magic;
69 union {
70 u8 *host;
71 u8 __iomem *adapter;
72 } msg_pool;
73 dma_addr_t host_dma;
74 DEFINE_DMA_UNMAP_ADDR(mapping);
75 u16 hint_count;
76 u16 priv;
77 struct c2_mq_shared __iomem *peer;
78 __be16 *shared;
79 dma_addr_t shared_dma;
80 u32 q_size;
81 u32 msg_size;
82 u32 index;
83 enum c2_mq_type type;
84 };
85
c2_mq_empty(struct c2_mq * q)86 static __inline__ int c2_mq_empty(struct c2_mq *q)
87 {
88 return q->priv == be16_to_cpu(*q->shared);
89 }
90
c2_mq_full(struct c2_mq * q)91 static __inline__ int c2_mq_full(struct c2_mq *q)
92 {
93 return q->priv == (be16_to_cpu(*q->shared) + q->q_size - 1) % q->q_size;
94 }
95
96 extern void c2_mq_lconsume(struct c2_mq *q, u32 wqe_count);
97 extern void *c2_mq_alloc(struct c2_mq *q);
98 extern void c2_mq_produce(struct c2_mq *q);
99 extern void *c2_mq_consume(struct c2_mq *q);
100 extern void c2_mq_free(struct c2_mq *q);
101 extern void c2_mq_req_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
102 u8 __iomem *pool_start, u16 __iomem *peer, u32 type);
103 extern void c2_mq_rep_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
104 u8 *pool_start, u16 __iomem *peer, u32 type);
105
106 #endif /* _C2_MQ_H_ */
107