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_MAX 0xffff 28 29#define VNIC_INTR_TIMER_TYPE_ABS 0 30#define VNIC_INTR_TIMER_TYPE_QUIET 1 31 32/* Interrupt control */ 33struct vnic_intr_ctrl { 34 u32 coalescing_timer; /* 0x00 */ 35 u32 pad0; 36 u32 coalescing_value; /* 0x08 */ 37 u32 pad1; 38 u32 coalescing_type; /* 0x10 */ 39 u32 pad2; 40 u32 mask_on_assertion; /* 0x18 */ 41 u32 pad3; 42 u32 mask; /* 0x20 */ 43 u32 pad4; 44 u32 int_credits; /* 0x28 */ 45 u32 pad5; 46 u32 int_credit_return; /* 0x30 */ 47 u32 pad6; 48}; 49 50struct vnic_intr { 51 unsigned int index; 52 struct vnic_dev *vdev; 53 struct vnic_intr_ctrl __iomem *ctrl; /* memory-mapped */ 54}; 55 56static inline void vnic_intr_unmask(struct vnic_intr *intr) 57{ 58 iowrite32(0, &intr->ctrl->mask); 59} 60 61static inline void vnic_intr_mask(struct vnic_intr *intr) 62{ 63 iowrite32(1, &intr->ctrl->mask); 64} 65 66static inline int vnic_intr_masked(struct vnic_intr *intr) 67{ 68 return ioread32(&intr->ctrl->mask); 69} 70 71static inline void vnic_intr_return_credits(struct vnic_intr *intr, 72 unsigned int credits, int unmask, int reset_timer) 73{ 74#define VNIC_INTR_UNMASK_SHIFT 16 75#define VNIC_INTR_RESET_TIMER_SHIFT 17 76 77 u32 int_credit_return = (credits & 0xffff) | 78 (unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) | 79 (reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0); 80 81 iowrite32(int_credit_return, &intr->ctrl->int_credit_return); 82} 83 84static inline unsigned int vnic_intr_credits(struct vnic_intr *intr) 85{ 86 return ioread32(&intr->ctrl->int_credits); 87} 88 89static inline void vnic_intr_return_all_credits(struct vnic_intr *intr) 90{ 91 unsigned int credits = vnic_intr_credits(intr); 92 int unmask = 1; 93 int reset_timer = 1; 94 95 vnic_intr_return_credits(intr, credits, unmask, reset_timer); 96} 97 98static inline u32 vnic_intr_legacy_pba(u32 __iomem *legacy_pba) 99{ 100 /* read PBA without clearing */ 101 return ioread32(legacy_pba); 102} 103 104void vnic_intr_free(struct vnic_intr *intr); 105int vnic_intr_alloc(struct vnic_dev *vdev, struct vnic_intr *intr, 106 unsigned int index); 107void vnic_intr_init(struct vnic_intr *intr, unsigned int coalescing_timer, 108 unsigned int coalescing_type, unsigned int mask_on_assertion); 109void vnic_intr_coalescing_timer_set(struct vnic_intr *intr, 110 unsigned int coalescing_timer); 111void vnic_intr_clean(struct vnic_intr *intr); 112 113#endif /* _VNIC_INTR_H_ */ 114