1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright 2014 Cisco Systems, Inc. All rights reserved. */ 3 4 #ifndef _VNIC_INTR_H_ 5 #define _VNIC_INTR_H_ 6 7 #include <linux/pci.h> 8 #include "vnic_dev.h" 9 10 #define VNIC_INTR_TIMER_MAX 0xffff 11 12 #define VNIC_INTR_TIMER_TYPE_ABS 0 13 #define VNIC_INTR_TIMER_TYPE_QUIET 1 14 15 /* Interrupt control */ 16 struct vnic_intr_ctrl { 17 u32 coalescing_timer; /* 0x00 */ 18 u32 pad0; 19 u32 coalescing_value; /* 0x08 */ 20 u32 pad1; 21 u32 coalescing_type; /* 0x10 */ 22 u32 pad2; 23 u32 mask_on_assertion; /* 0x18 */ 24 u32 pad3; 25 u32 mask; /* 0x20 */ 26 u32 pad4; 27 u32 int_credits; /* 0x28 */ 28 u32 pad5; 29 u32 int_credit_return; /* 0x30 */ 30 u32 pad6; 31 }; 32 33 struct vnic_intr { 34 unsigned int index; 35 struct vnic_dev *vdev; 36 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */ 37 }; 38 39 static inline void 40 svnic_intr_unmask(struct vnic_intr *intr) 41 { 42 iowrite32(0, &intr->ctrl->mask); 43 } 44 45 static inline void 46 svnic_intr_mask(struct vnic_intr *intr) 47 { 48 iowrite32(1, &intr->ctrl->mask); 49 } 50 51 static inline void 52 svnic_intr_return_credits(struct vnic_intr *intr, 53 unsigned int credits, 54 int unmask, 55 int reset_timer) 56 { 57 #define VNIC_INTR_UNMASK_SHIFT 16 58 #define VNIC_INTR_RESET_TIMER_SHIFT 17 59 60 u32 int_credit_return = (credits & 0xffff) | 61 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) | 62 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0); 63 64 iowrite32(int_credit_return, &intr->ctrl->int_credit_return); 65 } 66 67 static inline unsigned int 68 svnic_intr_credits(struct vnic_intr *intr) 69 { 70 return ioread32(&intr->ctrl->int_credits); 71 } 72 73 static inline void 74 svnic_intr_return_all_credits(struct vnic_intr *intr) 75 { 76 unsigned int credits = svnic_intr_credits(intr); 77 int unmask = 1; 78 int reset_timer = 1; 79 80 svnic_intr_return_credits(intr, credits, unmask, reset_timer); 81 } 82 83 void svnic_intr_free(struct vnic_intr *); 84 int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int); 85 void svnic_intr_init(struct vnic_intr *intr, 86 unsigned int coalescing_timer, 87 unsigned int coalescing_type, 88 unsigned int mask_on_assertion); 89 void svnic_intr_clean(struct vnic_intr *); 90 91 #endif /* _VNIC_INTR_H_ */ 92