/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */

#ifndef _VNIC_INTR_H_
#define _VNIC_INTR_H_

#include <linux/pci.h>
#include "vnic_dev.h"

#define VNIC_INTR_TIMER_MAX             0xffff

#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
svnic_intr_unmask(struct vnic_intr *intr)
{
        iowrite32(0, &intr->ctrl->mask);
}

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

static inline void
svnic_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
svnic_intr_credits(struct vnic_intr *intr)
{
        return ioread32(&intr->ctrl->int_credits);
}

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

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

void svnic_intr_free(struct vnic_intr *);
int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
void svnic_intr_init(struct vnic_intr *intr,
                     unsigned int coalescing_timer,
                     unsigned int coalescing_type,
                     unsigned int mask_on_assertion);
void svnic_intr_clean(struct vnic_intr *);

#endif /* _VNIC_INTR_H_ */