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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6
   7 #ifndef _VNIC_INTR_H_
   8 #define _VNIC_INTR_H_
   9
  10 #include <linux/pci.h>
  11
  12 #include "vnic_dev.h"
  13
  14 #define VNIC_INTR_TIMER_TYPE_ABS        0
  15 #define VNIC_INTR_TIMER_TYPE_QUIET      1
  16
  17 /* Interrupt control */
  18 struct vnic_intr_ctrl {
  19         u32 coalescing_timer;           /* 0x00 */
  20         u32 pad0;
  21         u32 coalescing_value;           /* 0x08 */
  22         u32 pad1;
  23         u32 coalescing_type;            /* 0x10 */
  24         u32 pad2;
  25         u32 mask_on_assertion;          /* 0x18 */
  26         u32 pad3;
  27         u32 mask;                       /* 0x20 */
  28         u32 pad4;
  29         u32 int_credits;                /* 0x28 */
  30         u32 pad5;
  31         u32 int_credit_return;          /* 0x30 */
  32         u32 pad6;
  33 };
  34
  35 struct vnic_intr {
  36         unsigned int index;
  37         struct vnic_dev *vdev;
  38         struct vnic_intr_ctrl __iomem *ctrl;            /* memory-mapped */
  39 };
  40
  41 static inline void vnic_intr_unmask(struct vnic_intr *intr)
  42 {
  43         iowrite32(0, &intr->ctrl->mask);
  44 }
  45
  46 static inline void vnic_intr_mask(struct vnic_intr *intr)
  47 {
  48         iowrite32(1, &intr->ctrl->mask);
  49 }
  50
  51 static inline int vnic_intr_masked(struct vnic_intr *intr)
  52 {
  53         return ioread32(&intr->ctrl->mask);
  54 }
  55
  56 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
  57         unsigned int credits, int unmask, int reset_timer)
  58 {
  59 #define VNIC_INTR_UNMASK_SHIFT          16
  60 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  61
  62         u32 int_credit_return = (credits & 0xffff) |
  63                 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  64                 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  65
  66         iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  67 }
  68
  69 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
  70 {
  71         return ioread32(&intr->ctrl->int_credits);
  72 }
  73
  74 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
  75 {
  76         unsigned int credits = vnic_intr_credits(intr);
  77         int unmask = 1;
  78         int reset_timer = 1;
  79
  80         vnic_intr_return_credits(intr, credits, unmask, reset_timer);
  81 }
  82
  83 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
  84 {
  85         /* read PBA without clearing */
  86         return ioread32(legacy_pba);
  87 }
  88
  89 void vnic_intr_free(struct vnic_intr *intr);
  90 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
  91         unsigned int index);
  92 void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
  93         unsigned int coalescing_type, unsigned int mask_on_assertion);
  94 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
  95         u32 coalescing_timer);
  96 void vnic_intr_clean(struct vnic_intr *intr);
  97
  98 #endif /* _VNIC_INTR_H_ */