1/*
  2 * Copyright 2008-2010 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 */
 19
 20#ifndef _VNIC_INTR_H_
 21#define _VNIC_INTR_H_
 22
 23#include <linux/pci.h>
 24
 25#include "vnic_dev.h"
 26
 27#define VNIC_INTR_TIMER_TYPE_ABS	0
 28#define VNIC_INTR_TIMER_TYPE_QUIET	1
 29
 30/* Interrupt control */
 31struct vnic_intr_ctrl {
 32	u32 coalescing_timer;		/* 0x00 */
 33	u32 pad0;
 34	u32 coalescing_value;		/* 0x08 */
 35	u32 pad1;
 36	u32 coalescing_type;		/* 0x10 */
 37	u32 pad2;
 38	u32 mask_on_assertion;		/* 0x18 */
 39	u32 pad3;
 40	u32 mask;			/* 0x20 */
 41	u32 pad4;
 42	u32 int_credits;		/* 0x28 */
 43	u32 pad5;
 44	u32 int_credit_return;		/* 0x30 */
 45	u32 pad6;
 46};
 47
 48struct vnic_intr {
 49	unsigned int index;
 50	struct vnic_dev *vdev;
 51	struct vnic_intr_ctrl __iomem *ctrl;		/* memory-mapped */
 52};
 53
 54static inline void vnic_intr_unmask(struct vnic_intr *intr)
 55{
 56	iowrite32(0, &intr->ctrl->mask);
 57}
 58
 59static inline void vnic_intr_mask(struct vnic_intr *intr)
 60{
 61	iowrite32(1, &intr->ctrl->mask);
 62}
 63
 64static inline int vnic_intr_masked(struct vnic_intr *intr)
 65{
 66	return ioread32(&intr->ctrl->mask);
 67}
 68
 69static inline void vnic_intr_return_credits(struct vnic_intr *intr,
 70	unsigned int credits, int unmask, int reset_timer)
 71{
 72#define VNIC_INTR_UNMASK_SHIFT		16
 73#define VNIC_INTR_RESET_TIMER_SHIFT	17
 74
 75	u32 int_credit_return = (credits & 0xffff) |
 76		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
 77		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
 78
 79	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
 80}
 81
 82static inline unsigned int vnic_intr_credits(struct vnic_intr *intr)
 83{
 84	return ioread32(&intr->ctrl->int_credits);
 85}
 86
 87static inline void vnic_intr_return_all_credits(struct vnic_intr *intr)
 88{
 89	unsigned int credits = vnic_intr_credits(intr);
 90	int unmask = 1;
 91	int reset_timer = 1;
 92
 93	vnic_intr_return_credits(intr, credits, unmask, reset_timer);
 94}
 95
 96static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba)
 97{
 98	/* read PBA without clearing */
 99	return ioread32(legacy_pba);
100}
101
102void vnic_intr_free(struct vnic_intr *intr);
103int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr,
104	unsigned int index);
105void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer,
106	unsigned int coalescing_type, unsigned int mask_on_assertion);
107void vnic_intr_coalescing_timer_set(struct vnic_intr *intr,
108	u32 coalescing_timer);
109void vnic_intr_clean(struct vnic_intr *intr);
110
111#endif /* _VNIC_INTR_H_ */