LXR linux/drivers/scsi/snic/vnic

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#ifndef _VNIC_INTR_H_
  19#define _VNIC_INTR_H_
  20
  21#include <linux/pci.h>
  22#include "vnic_dev.h"
  23
  24#define VNIC_INTR_TIMER_MAX             0xffff
  25
  26#define VNIC_INTR_TIMER_TYPE_ABS        0
  27#define VNIC_INTR_TIMER_TYPE_QUIET      1
  28
  29/* Interrupt control */
  30struct vnic_intr_ctrl {
  31        u32 coalescing_timer;           /* 0x00 */
  32        u32 pad0;
  33        u32 coalescing_value;           /* 0x08 */
  34        u32 pad1;
  35        u32 coalescing_type;            /* 0x10 */
  36        u32 pad2;
  37        u32 mask_on_assertion;          /* 0x18 */
  38        u32 pad3;
  39        u32 mask;                       /* 0x20 */
  40        u32 pad4;
  41        u32 int_credits;                /* 0x28 */
  42        u32 pad5;
  43        u32 int_credit_return;          /* 0x30 */
  44        u32 pad6;
  45};
  46
  47struct vnic_intr {
  48        unsigned int index;
  49        struct vnic_dev *vdev;
  50        struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
  51};
  52
  53static inline void
  54svnic_intr_unmask(struct vnic_intr *intr)
  55{
  56        iowrite32(0, &intr->ctrl->mask);
  57}
  58
  59static inline void
  60svnic_intr_mask(struct vnic_intr *intr)
  61{
  62        iowrite32(1, &intr->ctrl->mask);
  63}
  64
  65static inline void
  66svnic_intr_return_credits(struct vnic_intr *intr,
  67                          unsigned int credits,
  68                          int unmask,
  69                          int reset_timer)
  70{
  71#define VNIC_INTR_UNMASK_SHIFT          16
  72#define VNIC_INTR_RESET_TIMER_SHIFT     17
  73
  74        u32 int_credit_return = (credits & 0xffff) |
  75                (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  76                (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  77
  78        iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  79}
  80
  81static inline unsigned int
  82svnic_intr_credits(struct vnic_intr *intr)
  83{
  84        return ioread32(&intr->ctrl->int_credits);
  85}
  86
  87static inline void
  88svnic_intr_return_all_credits(struct vnic_intr *intr)
  89{
  90        unsigned int credits = svnic_intr_credits(intr);
  91        int unmask = 1;
  92        int reset_timer = 1;
  93
  94        svnic_intr_return_credits(intr, credits, unmask, reset_timer);
  95}
  96
  97void svnic_intr_free(struct vnic_intr *);
  98int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
  99void svnic_intr_init(struct vnic_intr *intr,
 100                     unsigned int coalescing_timer,
 101                     unsigned int coalescing_type,
 102                     unsigned int mask_on_assertion);
 103void svnic_intr_clean(struct vnic_intr *);
 104
 105#endif /* _VNIC_INTR_H_ */
 106