LXR linux/drivers/infiniband/hw/amso1100/c2

   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
  40enum c2_shared_regs {
  41
  42        C2_SHARED_ARMED = 0x10,
  43        C2_SHARED_NOTIFY = 0x18,
  44        C2_SHARED_SHARED = 0x40,
  45};
  46
  47struct 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
  57enum 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  ' */
  67struct 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
  86static __inline__ int c2_mq_empty(struct c2_mq *q)
  87{
  88        return q->priv == be16_to_cpu(*q->shared);
  89}
  90
  91static __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
  96extern void c2_mq_lconsume(struct c2_mq *q, u32 wqe_count);
  97extern void *c2_mq_alloc(struct c2_mq *q);
  98extern void c2_mq_produce(struct c2_mq *q);
  99extern void *c2_mq_consume(struct c2_mq *q);
 100extern void c2_mq_free(struct c2_mq *q);
 101extern 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);
 103extern 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