106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _VNIC_INTR_H_
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#define _VNIC_INTR_H_
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#include <linux/pci.h>
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#include "vnic_dev.h"
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#define VNIC_INTR_TIMER_MAX 0xffff
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#define VNIC_INTR_TIMER_TYPE_ABS 0
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#define VNIC_INTR_TIMER_TYPE_QUIET 1
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/* Interrupt control */
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struct vnic_intr_ctrl {
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u32 coalescing_timer; /* 0x00 */
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u32 pad0;
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u32 coalescing_value; /* 0x08 */
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u32 pad1;
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u32 coalescing_type; /* 0x10 */
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u32 pad2;
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u32 mask_on_assertion; /* 0x18 */
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u32 pad3;
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u32 mask; /* 0x20 */
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u32 pad4;
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u32 int_credits; /* 0x28 */
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u32 pad5;
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u32 int_credit_return; /* 0x30 */
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u32 pad6;
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};
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struct vnic_intr {
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unsigned int index;
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struct vnic_dev *vdev;
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struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */
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};
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static inline void
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svnic_intr_unmask(struct vnic_intr *intr)
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{
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iowrite32(0, &intr->ctrl->mask);
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}
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static inline void
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svnic_intr_mask(struct vnic_intr *intr)
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{
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iowrite32(1, &intr->ctrl->mask);
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}
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static inline void
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svnic_intr_return_credits(struct vnic_intr *intr,
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unsigned int credits,
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int unmask,
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int reset_timer)
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{
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#define VNIC_INTR_UNMASK_SHIFT 16
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#define VNIC_INTR_RESET_TIMER_SHIFT 17
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u32 int_credit_return = (credits & 0xffff) |
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(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
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(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
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iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
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}
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static inline unsigned int
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svnic_intr_credits(struct vnic_intr *intr)
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{
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return ioread32(&intr->ctrl->int_credits);
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}
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static inline void
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svnic_intr_return_all_credits(struct vnic_intr *intr)
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{
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unsigned int credits = svnic_intr_credits(intr);
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int unmask = 1;
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int reset_timer = 1;
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svnic_intr_return_credits(intr, credits, unmask, reset_timer);
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}
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void svnic_intr_free(struct vnic_intr *);
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int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
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void svnic_intr_init(struct vnic_intr *intr,
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unsigned int coalescing_timer,
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unsigned int coalescing_type,
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unsigned int mask_on_assertion);
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void svnic_intr_clean(struct vnic_intr *);
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#endif /* _VNIC_INTR_H_ */
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