drivers/scsi/fnic/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 #ifndef _VNIC_INTR_H_
  19 #define _VNIC_INTR_H_
  20
  21 #include <linux/pci.h>
  22 #include "vnic_dev.h"
  23
  24 /*
  25  * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth
  26  * Driver) when both are built with CONFIG options =y
  27  */
  28 #define vnic_intr_unmask fnic_intr_unmask
  29 #define vnic_intr_mask fnic_intr_mask
  30 #define vnic_intr_return_credits fnic_intr_return_credits
  31 #define vnic_intr_credits fnic_intr_credits
  32 #define vnic_intr_return_all_credits fnic_intr_return_all_credits
  33 #define vnic_intr_legacy_pba fnic_intr_legacy_pba
  34 #define vnic_intr_free fnic_intr_free
  35 #define vnic_intr_alloc fnic_intr_alloc
  36 #define vnic_intr_init fnic_intr_init
  37 #define vnic_intr_clean fnic_intr_clean
  38
  39 #define VNIC_INTR_TIMER_MAX             0xffff
  40
  41 #define VNIC_INTR_TIMER_TYPE_ABS        0
  42 #define VNIC_INTR_TIMER_TYPE_QUIET      1
  43
  44 /* Interrupt control */
  45 struct vnic_intr_ctrl {
  46         u32 coalescing_timer;           /* 0x00 */
  47         u32 pad0;
  48         u32 coalescing_value;           /* 0x08 */
  49         u32 pad1;
  50         u32 coalescing_type;            /* 0x10 */
  51         u32 pad2;
  52         u32 mask_on_assertion;          /* 0x18 */
  53         u32 pad3;
  54         u32 mask;                       /* 0x20 */
  55         u32 pad4;
  56         u32 int_credits;                /* 0x28 */
  57         u32 pad5;
  58         u32 int_credit_return;          /* 0x30 */
  59         u32 pad6;
  60 };
  61
  62 struct vnic_intr {
  63         unsigned int index;
  64         struct vnic_dev *vdev;
  65         struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
  66 };
  67
  68 static inline void vnic_intr_unmask(struct vnic_intr *intr)
  69 {
  70         iowrite32(0, &intr->ctrl->mask);
  71 }
  72
  73 static inline void vnic_intr_mask(struct vnic_intr *intr)
  74 {
  75         iowrite32(1, &intr->ctrl->mask);
  76 }
  77
  78 static inline void vnic_intr_return_credits(struct vnic_intr *intr,
  79         unsigned int credits, int unmask, int reset_timer)
  80 {
  81 #define VNIC_INTR_UNMASK_SHIFT          16
  82 #define VNIC_INTR_RESET_TIMER_SHIFT     17
  83
  84         u32 int_credit_return = (credits & 0xffff) |
  85                 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
  86                 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
  87
  88         iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
  89 }
  90
  91 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
  92 {
  93         return ioread32(&intr->ctrl->int_credits);
  94 }
  95
  96 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
  97 {
  98         unsigned int credits = vnic_intr_credits(intr);
  99         int unmask = 1;
 100         int reset_timer = 1;
 101
 102         vnic_intr_return_credits(intr, credits, unmask, reset_timer);
 103 }
 104
 105 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
 106 {
 107         /* read PBA without clearing */
 108         return ioread32(legacy_pba);
 109 }
 110
 111 void vnic_intr_free(struct vnic_intr *intr);
 112 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
 113         unsigned int index);
 114 void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
 115         unsigned int coalescing_type, unsigned int mask_on_assertion);
 116 void vnic_intr_clean(struct vnic_intr *intr);
 117
 118 #endif /* _VNIC_INTR_H_ */