drivers/net/enic/vnic_intr.h

   1 /*
   2  * Copyright 2008 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_MAX             0xffff
  28
  29 #define VNIC_INTR_TIMER_TYPE_ABS        0
  30 #define VNIC_INTR_TIMER_TYPE_QUIET      1
  31
  32 /* Interrupt control */
  33 struct vnic_intr_ctrl {
  34         u32 coalescing_timer;           /* 0x00 */
  35         u32 pad0;
  36         u32 coalescing_value;           /* 0x08 */
  37         u32 pad1;
  38         u32 coalescing_type;            /* 0x10 */
  39         u32 pad2;
  40         u32 mask_on_assertion;          /* 0x18 */
  41         u32 pad3;
  42         u32 mask;                       /* 0x20 */
  43         u32 pad4;
  44         u32 int_credits;                /* 0x28 */
  45         u32 pad5;
  46         u32 int_credit_return;          /* 0x30 */
  47         u32 pad6;
  48 };
  49
  50 struct vnic_intr {
  51         unsigned int index;
  52         struct vnic_dev *vdev;
  53         struct vnic_intr_ctrl __iomem *ctrl;            /* memory-mapped */
  54 };
  55
  56 static inline void vnic_intr_unmask(struct vnic_intr *intr)
  57 {
  58         iowrite32(0, &intr->ctrl->mask);
  59 }
  60
  61 static inline void vnic_intr_mask(struct vnic_intr *intr)
  62 {
  63         iowrite32(1, &intr->ctrl->mask);
  64 }
  65
  66 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
  67         unsigned int credits, int unmask, int reset_timer)
  68 {
  69 #define VNIC_INTR_UNMASK_SHIFT          16
  70 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  71
  72         u32 int_credit_return = (credits & 0xffff) |
  73                 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  74                 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  75
  76         iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  77 }
  78
  79 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
  80 {
  81         return ioread32(&intr->ctrl->int_credits);
  82 }
  83
  84 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
  85 {
  86         unsigned int credits = vnic_intr_credits(intr);
  87         int unmask = 1;
  88         int reset_timer = 1;
  89
  90         vnic_intr_return_credits(intr, credits, unmask, reset_timer);
  91 }
  92
  93 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
  94 {
  95         /* read PBA without clearing */
  96         return ioread32(legacy_pba);
  97 }
  98
  99 void vnic_intr_free(struct vnic_intr *intr);
 100 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
 101         unsigned int index);
 102 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
 103         unsigned int coalescing_type, unsigned int mask_on_assertion);
 104 void vnic_intr_clean(struct vnic_intr *intr);
 105
 106 #endif /* _VNIC_INTR_H_ */