drivers/net/ethernet/cisco/enic/vnic_intr.c

   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 #include <linux/delay.h>
  25
  26 #include "vnic_dev.h"
  27 #include "vnic_intr.h"
  28 #include "enic.h"
  29
  30 void vnic_intr_free(struct vnic_intr *intr)
  31 {
  32         intr->ctrl = NULL;
  33 }
  34
  35 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  36         unsigned int index)
  37 {
  38         intr->index = index;
  39         intr->vdev = vdev;
  40
  41         intr->ctrl = vnic_dev_get_res(vdev, RES_TYPE_INTR_CTRL, index);
  42         if (!intr->ctrl) {
  43                 vdev_err(vdev, "Failed to hook INTR[%d].ctrl resource\n",
  44                          index);
  45                 return -EINVAL;
  46         }
  47
  48         return 0;
  49 }
  50
  51 void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
  52         unsigned int coalescing_type, unsigned int mask_on_assertion)
  53 {
  54         vnic_intr_coalescing_timer_set(intr, coalescing_timer);
  55         iowrite32(coalescing_type, &intr->ctrl->coalescing_type);
  56         iowrite32(mask_on_assertion, &intr->ctrl->mask_on_assertion);
  57         iowrite32(0, &intr->ctrl->int_credits);
  58 }
  59
  60 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
  61         u32 coalescing_timer)
  62 {
  63         iowrite32(vnic_dev_intr_coal_timer_usec_to_hw(intr->vdev,
  64                 coalescing_timer), &intr->ctrl->coalescing_timer);
  65 }
  66
  67 void vnic_intr_clean(struct vnic_intr *intr)
  68 {
  69         iowrite32(0, &intr->ctrl->int_credits);
  70 }