drivers/scsi/snic/vnic_intr.h

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #ifndef _VNIC_INTR_H_
  19 #define _VNIC_INTR_H_
  20
  21 #include <linux/pci.h>
  22 #include "vnic_dev.h"
  23
  24 #define VNIC_INTR_TIMER_MAX             0xffff
  25
  26 #define VNIC_INTR_TIMER_TYPE_ABS        0
  27 #define VNIC_INTR_TIMER_TYPE_QUIET      1
  28
  29 /* Interrupt control */
  30 struct vnic_intr_ctrl {
  31         u32 coalescing_timer;           /* 0x00 */
  32         u32 pad0;
  33         u32 coalescing_value;           /* 0x08 */
  34         u32 pad1;
  35         u32 coalescing_type;            /* 0x10 */
  36         u32 pad2;
  37         u32 mask_on_assertion;          /* 0x18 */
  38         u32 pad3;
  39         u32 mask;                       /* 0x20 */
  40         u32 pad4;
  41         u32 int_credits;                /* 0x28 */
  42         u32 pad5;
  43         u32 int_credit_return;          /* 0x30 */
  44         u32 pad6;
  45 };
  46
  47 struct vnic_intr {
  48         unsigned int index;
  49         struct vnic_dev *vdev;
  50         struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
  51 };
  52
  53 static inline void
  54 svnic_intr_unmask(struct vnic_intr *intr)
  55 {
  56         iowrite32(0, &intr->ctrl->mask);
  57 }
  58
  59 static inline void
  60 svnic_intr_mask(struct vnic_intr *intr)
  61 {
  62         iowrite32(1, &intr->ctrl->mask);
  63 }
  64
  65 static inline void
  66 svnic_intr_return_credits(struct vnic_intr *intr,
  67                           unsigned int credits,
  68                           int unmask,
  69                           int reset_timer)
  70 {
  71 #define VNIC_INTR_UNMASK_SHIFT          16
  72 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  73
  74         u32 int_credit_return = (credits & 0xffff) |
  75                 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  76                 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  77
  78         iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  79 }
  80
  81 static inline unsigned int
  82 svnic_intr_credits(struct vnic_intr *intr)
  83 {
  84         return ioread32(&intr->ctrl->int_credits);
  85 }
  86
  87 static inline void
  88 svnic_intr_return_all_credits(struct vnic_intr *intr)
  89 {
  90         unsigned int credits = svnic_intr_credits(intr);
  91         int unmask = 1;
  92         int reset_timer = 1;
  93
  94         svnic_intr_return_credits(intr, credits, unmask, reset_timer);
  95 }
  96
  97 void svnic_intr_free(struct vnic_intr *);
  98 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
  99 void svnic_intr_init(struct vnic_intr *intr,
 100                      unsigned int coalescing_timer,
 101                      unsigned int coalescing_type,
 102                      unsigned int mask_on_assertion);
 103 void svnic_intr_clean(struct vnic_intr *);
 104
 105 #endif /* _VNIC_INTR_H_ */