drivers/scsi/snic/vnic_intr.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
   3
   4 #ifndef _VNIC_INTR_H_
   5 #define _VNIC_INTR_H_
   6
   7 #include <linux/pci.h>
   8 #include "vnic_dev.h"
   9
  10 #define VNIC_INTR_TIMER_MAX             0xffff
  11
  12 #define VNIC_INTR_TIMER_TYPE_ABS        0
  13 #define VNIC_INTR_TIMER_TYPE_QUIET      1
  14
  15 /* Interrupt control */
  16 struct vnic_intr_ctrl {
  17         u32 coalescing_timer;           /* 0x00 */
  18         u32 pad0;
  19         u32 coalescing_value;           /* 0x08 */
  20         u32 pad1;
  21         u32 coalescing_type;            /* 0x10 */
  22         u32 pad2;
  23         u32 mask_on_assertion;          /* 0x18 */
  24         u32 pad3;
  25         u32 mask;                       /* 0x20 */
  26         u32 pad4;
  27         u32 int_credits;                /* 0x28 */
  28         u32 pad5;
  29         u32 int_credit_return;          /* 0x30 */
  30         u32 pad6;
  31 };
  32
  33 struct vnic_intr {
  34         unsigned int index;
  35         struct vnic_dev *vdev;
  36         struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
  37 };
  38
  39 static inline void
  40 svnic_intr_unmask(struct vnic_intr *intr)
  41 {
  42         iowrite32(0, &intr->ctrl->mask);
  43 }
  44
  45 static inline void
  46 svnic_intr_mask(struct vnic_intr *intr)
  47 {
  48         iowrite32(1, &intr->ctrl->mask);
  49 }
  50
  51 static inline void
  52 svnic_intr_return_credits(struct vnic_intr *intr,
  53                           unsigned int credits,
  54                           int unmask,
  55                           int reset_timer)
  56 {
  57 #define VNIC_INTR_UNMASK_SHIFT          16
  58 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  59
  60         u32 int_credit_return = (credits & 0xffff) |
  61                 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  62                 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  63
  64         iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  65 }
  66
  67 static inline unsigned int
  68 svnic_intr_credits(struct vnic_intr *intr)
  69 {
  70         return ioread32(&intr->ctrl->int_credits);
  71 }
  72
  73 static inline void
  74 svnic_intr_return_all_credits(struct vnic_intr *intr)
  75 {
  76         unsigned int credits = svnic_intr_credits(intr);
  77         int unmask = 1;
  78         int reset_timer = 1;
  79
  80         svnic_intr_return_credits(intr, credits, unmask, reset_timer);
  81 }
  82
  83 void svnic_intr_free(struct vnic_intr *);
  84 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
  85 void svnic_intr_init(struct vnic_intr *intr,
  86                      unsigned int coalescing_timer,
  87                      unsigned int coalescing_type,
  88                      unsigned int mask_on_assertion);
  89 void svnic_intr_clean(struct vnic_intr *);
  90
  91 #endif /* _VNIC_INTR_H_ */