drivers/net/enic/base/vnic_intr.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  */
   5
   6 #ifndef _VNIC_INTR_H_
   7 #define _VNIC_INTR_H_
   8
   9
  10 #include "vnic_dev.h"
  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         uint32_t coalescing_timer;              /* 0x00 */
  18         uint32_t pad0;
  19         uint32_t coalescing_value;              /* 0x08 */
  20         uint32_t pad1;
  21         uint32_t coalescing_type;               /* 0x10 */
  22         uint32_t pad2;
  23         uint32_t mask_on_assertion;             /* 0x18 */
  24         uint32_t pad3;
  25         uint32_t mask;                          /* 0x20 */
  26         uint32_t pad4;
  27         uint32_t int_credits;                   /* 0x28 */
  28         uint32_t pad5;
  29         uint32_t int_credit_return;             /* 0x30 */
  30         uint32_t 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 vnic_intr_unmask(struct vnic_intr *intr)
  40 {
  41         iowrite32(0, &intr->ctrl->mask);
  42 }
  43
  44 static inline void vnic_intr_mask(struct vnic_intr *intr)
  45 {
  46         iowrite32(1, &intr->ctrl->mask);
  47 }
  48
  49 static inline int vnic_intr_masked(struct vnic_intr *intr)
  50 {
  51         return ioread32(&intr->ctrl->mask);
  52 }
  53
  54 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
  55         unsigned int credits, int unmask, int reset_timer)
  56 {
  57 #define VNIC_INTR_UNMASK_SHIFT          16
  58 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  59
  60         uint32_t 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 vnic_intr_credits(struct vnic_intr *intr)
  68 {
  69         return ioread32(&intr->ctrl->int_credits);
  70 }
  71
  72 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
  73 {
  74         unsigned int credits = vnic_intr_credits(intr);
  75         int unmask = 1;
  76         int reset_timer = 1;
  77
  78         vnic_intr_return_credits(intr, credits, unmask, reset_timer);
  79 }
  80
  81 static inline uint32_t vnic_intr_legacy_pba(uint32_t __iomem *legacy_pba)
  82 {
  83         /* read PBA without clearing */
  84         return ioread32(legacy_pba);
  85 }
  86
  87 void vnic_intr_free(struct vnic_intr *intr);
  88 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  89         unsigned int index);
  90 void vnic_intr_init(struct vnic_intr *intr, uint32_t coalescing_timer,
  91         unsigned int coalescing_type, unsigned int mask_on_assertion);
  92 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
  93         uint32_t coalescing_timer);
  94 void vnic_intr_clean(struct vnic_intr *intr);
  95
  96 #endif /* _VNIC_INTR_H_ */