1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved. 4 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 5 */ 6 7 #ifndef _VNIC_INTR_H_ 8 #define _VNIC_INTR_H_ 9 10 #include <linux/pci.h> 11 12 #include "vnic_dev.h" 13 14 #define VNIC_INTR_TIMER_TYPE_ABS 0 15 #define VNIC_INTR_TIMER_TYPE_QUIET 1 16 17 /* Interrupt control */ 18 struct vnic_intr_ctrl { 19 u32 coalescing_timer; /* 0x00 */ 20 u32 pad0; 21 u32 coalescing_value; /* 0x08 */ 22 u32 pad1; 23 u32 coalescing_type; /* 0x10 */ 24 u32 pad2; 25 u32 mask_on_assertion; /* 0x18 */ 26 u32 pad3; 27 u32 mask; /* 0x20 */ 28 u32 pad4; 29 u32 int_credits; /* 0x28 */ 30 u32 pad5; 31 u32 int_credit_return; /* 0x30 */ 32 u32 pad6; 33 }; 34 35 struct vnic_intr { 36 unsigned int index; 37 struct vnic_dev *vdev; 38 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */ 39 }; 40 41 static inline void vnic_intr_unmask(struct vnic_intr *intr) 42 { 43 iowrite32(0, &intr->ctrl->mask); 44 } 45 46 static inline void vnic_intr_mask(struct vnic_intr *intr) 47 { 48 iowrite32(1, &intr->ctrl->mask); 49 } 50 51 static inline int vnic_intr_masked(struct vnic_intr *intr) 52 { 53 return ioread32(&intr->ctrl->mask); 54 } 55 56 static inline void vnic_intr_return_credits(struct vnic_intr *intr, 57 unsigned int credits, int unmask, int reset_timer) 58 { 59 #define VNIC_INTR_UNMASK_SHIFT 16 60 #define VNIC_INTR_RESET_TIMER_SHIFT 17 61 62 u32 int_credit_return = (credits & 0xffff) | 63 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) | 64 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0); 65 66 iowrite32(int_credit_return, &intr->ctrl->int_credit_return); 67 } 68 69 static inline unsigned int vnic_intr_credits(struct vnic_intr *intr) 70 { 71 return ioread32(&intr->ctrl->int_credits); 72 } 73 74 static inline void vnic_intr_return_all_credits(struct vnic_intr *intr) 75 { 76 unsigned int credits = vnic_intr_credits(intr); 77 int unmask = 1; 78 int reset_timer = 1; 79 80 vnic_intr_return_credits(intr, credits, unmask, reset_timer); 81 } 82 83 static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba) 84 { 85 /* read PBA without clearing */ 86 return ioread32(legacy_pba); 87 } 88 89 void vnic_intr_free(struct vnic_intr *intr); 90 int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr, 91 unsigned int index); 92 void vnic_intr_init(struct vnic_intr *intr, u32 coalescing_timer, 93 unsigned int coalescing_type, unsigned int mask_on_assertion); 94 void vnic_intr_coalescing_timer_set(struct vnic_intr *intr, 95 u32 coalescing_timer); 96 void vnic_intr_clean(struct vnic_intr *intr); 97 98 #endif /* _VNIC_INTR_H_ */ 99