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