vnic_intr.h

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/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef _VNIC_INTR_H_
#define _VNIC_INTR_H_

#include <linux/pci.h>

#include "vnic_dev.h"

#define VNIC_INTR_TIMER_TYPE_ABS    0
#define VNIC_INTR_TIMER_TYPE_QUIET  1

/* Interrupt control */
struct vnic_intr_ctrl {
    u32 coalescing_timer;       /* 0x00 */
    u32 pad0;
    u32 coalescing_value;       /* 0x08 */
    u32 pad1;
    u32 coalescing_type;        /* 0x10 */
    u32 pad2;
    u32 mask_on_assertion;      /* 0x18 */
    u32 pad3;
    u32 mask;           /* 0x20 */
    u32 pad4;
    u32 int_credits;        /* 0x28 */
    u32 pad5;
    u32 int_credit_return;      /* 0x30 */
    u32 pad6;
};

struct vnic_intr {
    unsigned int index;
    struct vnic_dev *vdev;
    struct vnic_intr_ctrl __iomem *ctrl;        /* memory-mapped */
};

static inline void vnic_intr_unmask(struct vnic_intr *intr)
{
    iowrite32(0, &intr->ctrl->mask);
}

static inline void vnic_intr_mask(struct vnic_intr *intr)
{
    iowrite32(1, &intr->ctrl->mask);
}

static inline int vnic_intr_masked(struct vnic_intr *intr)
{
    return ioread32(&intr->ctrl->mask);
}

static inline void vnic_intr_return_credits(struct vnic_intr *intr,
    unsigned int credits, int unmask, int reset_timer)
{
#define VNIC_INTR_UNMASK_SHIFT      16
#define VNIC_INTR_RESET_TIMER_SHIFT 17

    u32 int_credit_return = (credits & 0xffff) |
        (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
        (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);

    iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
}

static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
{
    return ioread32(&intr->ctrl->int_credits);
}

static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
{
    unsigned int credits = vnic_intr_credits(intr);
    int unmask = 1;
    int reset_timer = 1;

    vnic_intr_return_credits(intr, credits, unmask, reset_timer);
}

static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
{
    /* read PBA without clearing */
    return ioread32(legacy_pba);
}

void vnic_intr_free(struct vnic_intr *intr);
int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
    unsigned int index);
void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
    unsigned int coalescing_type, unsigned int mask_on_assertion);
void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
    u32 coalescing_timer);
void vnic_intr_clean(struct vnic_intr *intr);

#endif /* _VNIC_INTR_H_ */