LXR linux/drivers/scsi/fnic/vnic_wq

   1/*
   2 * Copyright 2008 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#include <linux/errno.h>
  20#include <linux/types.h>
  21#include <linux/pci.h>
  22#include <linux/delay.h>
  23#include "vnic_wq_copy.h"
  24
  25void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
  26{
  27        iowrite32(1, &wq->ctrl->enable);
  28}
  29
  30int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
  31{
  32        unsigned int wait;
  33
  34        iowrite32(0, &wq->ctrl->enable);
  35
  36        /* Wait for HW to ACK disable request */
  37        for (wait = 0; wait < 100; wait++) {
  38                if (!(ioread32(&wq->ctrl->running)))
  39                        return 0;
  40                udelay(1);
  41        }
  42
  43        printk(KERN_ERR "Failed to disable Copy WQ[%d],"
  44               " fetch index=%d, posted_index=%d\n",
  45               wq->index, ioread32(&wq->ctrl->fetch_index),
  46               ioread32(&wq->ctrl->posted_index));
  47
  48        return -ENODEV;
  49}
  50
  51void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
  52        void (*q_clean)(struct vnic_wq_copy *wq,
  53        struct fcpio_host_req *wq_desc))
  54{
  55        BUG_ON(ioread32(&wq->ctrl->enable));
  56
  57        if (vnic_wq_copy_desc_in_use(wq))
  58                vnic_wq_copy_service(wq, -1, q_clean);
  59
  60        wq->to_use_index = wq->to_clean_index = 0;
  61
  62        iowrite32(0, &wq->ctrl->fetch_index);
  63        iowrite32(0, &wq->ctrl->posted_index);
  64        iowrite32(0, &wq->ctrl->error_status);
  65
  66        vnic_dev_clear_desc_ring(&wq->ring);
  67}
  68
  69void vnic_wq_copy_free(struct vnic_wq_copy *wq)
  70{
  71        struct vnic_dev *vdev;
  72
  73        vdev = wq->vdev;
  74        vnic_dev_free_desc_ring(vdev, &wq->ring);
  75        wq->ctrl = NULL;
  76}
  77
  78int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
  79                       unsigned int index, unsigned int desc_count,
  80                       unsigned int desc_size)
  81{
  82        int err;
  83
  84        wq->index = index;
  85        wq->vdev = vdev;
  86        wq->to_use_index = wq->to_clean_index = 0;
  87        wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
  88        if (!wq->ctrl) {
  89                printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
  90                return -EINVAL;
  91        }
  92
  93        vnic_wq_copy_disable(wq);
  94
  95        err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
  96        if (err)
  97                return err;
  98
  99        return 0;
 100}
 101
 102void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
 103        unsigned int error_interrupt_enable,
 104        unsigned int error_interrupt_offset)
 105{
 106        u64 paddr;
 107
 108        paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 109        writeq(paddr, &wq->ctrl->ring_base);
 110        iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
 111        iowrite32(0, &wq->ctrl->fetch_index);
 112        iowrite32(0, &wq->ctrl->posted_index);
 113        iowrite32(cq_index, &wq->ctrl->cq_index);
 114        iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 115        iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 116}
 117
 118