scsi/snic/vnic_intr.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
0003
0004 #ifndef _VNIC_INTR_H_
0005 #define _VNIC_INTR_H_
0006
0007 #include <linux/pci.h>
0008 #include "vnic_dev.h"
0009
0010 #define VNIC_INTR_TIMER_MAX     0xffff
0011
0012 #define VNIC_INTR_TIMER_TYPE_ABS    0
0013 #define VNIC_INTR_TIMER_TYPE_QUIET  1
0014
0015 /* Interrupt control */
0016 struct vnic_intr_ctrl {
0017     u32 coalescing_timer;       /* 0x00 */
0018     u32 pad0;
0019     u32 coalescing_value;       /* 0x08 */
0020     u32 pad1;
0021     u32 coalescing_type;        /* 0x10 */
0022     u32 pad2;
0023     u32 mask_on_assertion;      /* 0x18 */
0024     u32 pad3;
0025     u32 mask;           /* 0x20 */
0026     u32 pad4;
0027     u32 int_credits;        /* 0x28 */
0028     u32 pad5;
0029     u32 int_credit_return;      /* 0x30 */
0030     u32 pad6;
0031 };
0032
0033 struct vnic_intr {
0034     unsigned int index;
0035     struct vnic_dev *vdev;
0036     struct vnic_intr_ctrl __iomem *ctrl;    /* memory-mapped */
0037 };
0038
0039 static inline void
0040 svnic_intr_unmask(struct vnic_intr *intr)
0041 {
0042     iowrite32(0, &intr->ctrl->mask);
0043 }
0044
0045 static inline void
0046 svnic_intr_mask(struct vnic_intr *intr)
0047 {
0048     iowrite32(1, &intr->ctrl->mask);
0049 }
0050
0051 static inline void
0052 svnic_intr_return_credits(struct vnic_intr *intr,
0053               unsigned int credits,
0054               int unmask,
0055               int reset_timer)
0056 {
0057 #define VNIC_INTR_UNMASK_SHIFT      16
0058 #define VNIC_INTR_RESET_TIMER_SHIFT 17
0059
0060     u32 int_credit_return = (credits & 0xffff) |
0061         (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
0062         (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);
0063
0064     iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
0065 }
0066
0067 static inline unsigned int
0068 svnic_intr_credits(struct vnic_intr *intr)
0069 {
0070     return ioread32(&intr->ctrl->int_credits);
0071 }
0072
0073 static inline void
0074 svnic_intr_return_all_credits(struct vnic_intr *intr)
0075 {
0076     unsigned int credits = svnic_intr_credits(intr);
0077     int unmask = 1;
0078     int reset_timer = 1;
0079
0080     svnic_intr_return_credits(intr, credits, unmask, reset_timer);
0081 }
0082
0083 void svnic_intr_free(struct vnic_intr *);
0084 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
0085 void svnic_intr_init(struct vnic_intr *intr,
0086              unsigned int coalescing_timer,
0087              unsigned int coalescing_type,
0088              unsigned int mask_on_assertion);
0089 void svnic_intr_clean(struct vnic_intr *);
0090
0091 #endif /* _VNIC_INTR_H_ */