drivers/infiniband/hw/amso1100/c2_mq.h

   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
  86 static __inline__ int c2_mq_empty(struct c2_mq *q)
  87 {
  88         return q->priv == be16_to_cpu(*q->shared);
  89 }
  90
  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_ */