LXR linux/drivers/net/ethernet/cisco/enic/vnic

   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#ifndef _VNIC_INTR_H_
  21#define _VNIC_INTR_H_
  22
  23#include <linux/pci.h>
  24
  25#include "vnic_dev.h"
  26
  27#define VNIC_INTR_TIMER_TYPE_ABS        0
  28#define VNIC_INTR_TIMER_TYPE_QUIET      1
  29
  30/* Interrupt control */
  31struct vnic_intr_ctrl {
  32        u32 coalescing_timer;           /* 0x00 */
  33        u32 pad0;
  34        u32 coalescing_value;           /* 0x08 */
  35        u32 pad1;
  36        u32 coalescing_type;            /* 0x10 */
  37        u32 pad2;
  38        u32 mask_on_assertion;          /* 0x18 */
  39        u32 pad3;
  40        u32 mask;                       /* 0x20 */
  41        u32 pad4;
  42        u32 int_credits;                /* 0x28 */
  43        u32 pad5;
  44        u32 int_credit_return;          /* 0x30 */
  45        u32 pad6;
  46};
  47
  48struct vnic_intr {
  49        unsigned int index;
  50        struct vnic_dev *vdev;
  51        struct vnic_intr_ctrl __iomem *ctrl;            /* memory-mapped */
  52};
  53
  54static inline void vnic_intr_unmask(struct vnic_intr *intr)
  55{
  56        iowrite32(0, &intr->ctrl->mask);
  57}
  58
  59static inline void vnic_intr_mask(struct vnic_intr *intr)
  60{
  61        iowrite32(1, &intr->ctrl->mask);
  62}
  63
  64static inline int vnic_intr_masked(struct vnic_intr *intr)
  65{
  66        return ioread32(&intr->ctrl->mask);
  67}
  68
  69static inline void vnic_intr_return_credits(struct vnic_intr *intr,
  70        unsigned int credits, int unmask, int reset_timer)
  71{
  72#define VNIC_INTR_UNMASK_SHIFT          16
  73#define VNIC_INTR_RESET_TIMER_SHIFT     17
  74
  75        u32 int_credit_return = (credits & 0xffff) |
  76                (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  77                (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  78
  79        iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  80}
  81
  82static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
  83{
  84        return ioread32(&intr->ctrl->int_credits);
  85}
  86
  87static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
  88{
  89        unsigned int credits = vnic_intr_credits(intr);
  90        int unmask = 1;
  91        int reset_timer = 1;
  92
  93        vnic_intr_return_credits(intr, credits, unmask, reset_timer);
  94}
  95
  96static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
  97{
  98        /* read PBA without clearing */
  99        return ioread32(legacy_pba);
 100}
 101
 102void vnic_intr_free(struct vnic_intr *intr);
 103int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
 104        unsigned int index);
 105void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
 106        unsigned int coalescing_type, unsigned int mask_on_assertion);
 107void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
 108        u32 coalescing_timer);
 109void vnic_intr_clean(struct vnic_intr *intr);
 110
 111#endif /* _VNIC_INTR_H_ */
 112