LXR linux/drivers/scsi/fnic/vnic

   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 */
  45struct 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
  62struct vnic_intr {
  63        unsigned int index;
  64        struct vnic_dev *vdev;
  65        struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
  66};
  67
  68static inline void vnic_intr_unmask(struct vnic_intr *intr)
  69{
  70        iowrite32(0, &intr->ctrl->mask);
  71}
  72
  73static inline void vnic_intr_mask(struct vnic_intr *intr)
  74{
  75        iowrite32(1, &intr->ctrl->mask);
  76}
  77
  78static 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
  91static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
  92{
  93        return ioread32(&intr->ctrl->int_credits);
  94}
  95
  96static 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
 105static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
 106{
 107        /* read PBA without clearing */
 108        return ioread32(legacy_pba);
 109}
 110
 111void vnic_intr_free(struct vnic_intr *intr);
 112int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
 113        unsigned int index);
 114void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer,
 115        unsigned int coalescing_type, unsigned int mask_on_assertion);
 116void vnic_intr_clean(struct vnic_intr *intr);
 117
 118#endif /* _VNIC_INTR_H_ */
 119