LXR linux/drivers/net/ethernet/cisco/enic/vnic

   1/*
   2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4 *
   5 * This program is free software; you may redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; version 2 of the License.
   8 *
   9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16 * SOFTWARE.
  17 *
  18 */
  19
  20#include <linux/kernel.h>
  21#include <linux/errno.h>
  22#include <linux/types.h>
  23#include <linux/pci.h>
  24
  25#include "vnic_dev.h"
  26#include "vnic_cq.h"
  27
  28void vnic_cq_free(struct vnic_cq *cq)
  29{
  30        vnic_dev_free_desc_ring(cq->vdev, &cq->ring);
  31
  32        cq->ctrl = NULL;
  33}
  34
  35int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
  36        unsigned int desc_count, unsigned int desc_size)
  37{
  38        int err;
  39
  40        cq->index = index;
  41        cq->vdev = vdev;
  42
  43        cq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_CQ, index);
  44        if (!cq->ctrl) {
  45                pr_err("Failed to hook CQ[%d] resource\n", index);
  46                return -EINVAL;
  47        }
  48
  49        err = vnic_dev_alloc_desc_ring(vdev, &cq->ring, desc_count, desc_size);
  50        if (err)
  51                return err;
  52
  53        return 0;
  54}
  55
  56void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
  57        unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
  58        unsigned int cq_tail_color, unsigned int interrupt_enable,
  59        unsigned int cq_entry_enable, unsigned int cq_message_enable,
  60        unsigned int interrupt_offset, u64 cq_message_addr)
  61{
  62        u64 paddr;
  63
  64        paddr = (u64)cq->ring.base_addr | VNIC_PADDR_TARGET;
  65        writeq(paddr, &cq->ctrl->ring_base);
  66        iowrite32(cq->ring.desc_count, &cq->ctrl->ring_size);
  67        iowrite32(flow_control_enable, &cq->ctrl->flow_control_enable);
  68        iowrite32(color_enable, &cq->ctrl->color_enable);
  69        iowrite32(cq_head, &cq->ctrl->cq_head);
  70        iowrite32(cq_tail, &cq->ctrl->cq_tail);
  71        iowrite32(cq_tail_color, &cq->ctrl->cq_tail_color);
  72        iowrite32(interrupt_enable, &cq->ctrl->interrupt_enable);
  73        iowrite32(cq_entry_enable, &cq->ctrl->cq_entry_enable);
  74        iowrite32(cq_message_enable, &cq->ctrl->cq_message_enable);
  75        iowrite32(interrupt_offset, &cq->ctrl->interrupt_offset);
  76        writeq(cq_message_addr, &cq->ctrl->cq_message_addr);
  77
  78        cq->interrupt_offset = interrupt_offset;
  79}
  80
  81void vnic_cq_clean(struct vnic_cq *cq)
  82{
  83        cq->to_clean = 0;
  84        cq->last_color = 0;
  85
  86        iowrite32(0, &cq->ctrl->cq_head);
  87        iowrite32(0, &cq->ctrl->cq_tail);
  88        iowrite32(1, &cq->ctrl->cq_tail_color);
  89
  90        vnic_dev_clear_desc_ring(&cq->ring);
  91}
  92