drivers/scsi/fnic/vnic_intr.c

   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/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/types.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include "vnic_dev.h"
  25 #include "vnic_intr.h"
  26
  27 void vnic_intr_free(struct vnic_intr *intr)
  28 {
  29         intr->ctrl = NULL;
  30 }
  31
  32 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  33         unsigned int index)
  34 {
  35         intr->index = index;
  36         intr->vdev = vdev;
  37
  38         intr->ctrl = vnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
  39         if (!intr->ctrl) {
  40                 printk(KERN_ERR "Failed to hook INTR[%d].ctrl resource\n",
  41                         index);
  42                 return -EINVAL;
  43         }
  44
  45         return 0;
  46 }
  47
  48 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
  49         unsigned int coalescing_type, unsigned int mask_on_assertion)
  50 {
  51         iowrite32(coalescing_timer, &intr->ctrl->coalescing_timer);
  52         iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
  53         iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
  54         iowrite32(0, &intr->ctrl->int_credits);
  55 }
  56
  57 void vnic_intr_clean(struct vnic_intr *intr)
  58 {
  59         iowrite32(0, &intr->ctrl->int_credits);
  60 }