1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 */
6
7#include <linux/errno.h>
8#include <linux/types.h>
9#include <linux/pci.h>
10#include <linux/delay.h>
11#include "vnic_wq_copy.h"
12
13void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
14{
15 iowrite32(1, &wq->ctrl->enable);
16}
17
18int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
19{
20 unsigned int wait;
21
22 iowrite32(0, &wq->ctrl->enable);
23
24 /* Wait for HW to ACK disable request */
25 for (wait = 0; wait < 100; wait++) {
26 if (!(ioread32(&wq->ctrl->running)))
27 return 0;
28 udelay(1);
29 }
30
31 printk(KERN_ERR "Failed to disable Copy WQ[%d],"
32 " fetch index=%d, posted_index=%d\n",
33 wq->index, ioread32(&wq->ctrl->fetch_index),
34 ioread32(&wq->ctrl->posted_index));
35
36 return -ENODEV;
37}
38
39void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
40 void (*q_clean)(struct vnic_wq_copy *wq,
41 struct fcpio_host_req *wq_desc))
42{
43 BUG_ON(ioread32(&wq->ctrl->enable));
44
45 if (vnic_wq_copy_desc_in_use(wq))
46 vnic_wq_copy_service(wq, completed_index: -1, q_service: q_clean);
47
48 wq->to_use_index = wq->to_clean_index = 0;
49
50 iowrite32(0, &wq->ctrl->fetch_index);
51 iowrite32(0, &wq->ctrl->posted_index);
52 iowrite32(0, &wq->ctrl->error_status);
53
54 vnic_dev_clear_desc_ring(ring: &wq->ring);
55}
56
57void vnic_wq_copy_free(struct vnic_wq_copy *wq)
58{
59 struct vnic_dev *vdev;
60
61 vdev = wq->vdev;
62 vnic_dev_free_desc_ring(vdev, ring: &wq->ring);
63 wq->ctrl = NULL;
64}
65
66int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
67 unsigned int index, unsigned int desc_count,
68 unsigned int desc_size)
69{
70 wq->index = index;
71 wq->vdev = vdev;
72 wq->to_use_index = wq->to_clean_index = 0;
73 wq->ctrl = vnic_dev_get_res(vdev, type: RES_TYPE_WQ, index);
74 if (!wq->ctrl) {
75 printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
76 return -EINVAL;
77 }
78
79 vnic_wq_copy_disable(wq);
80
81 return vnic_dev_alloc_desc_ring(vdev, ring: &wq->ring, desc_count, desc_size);
82}
83
84void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
85 unsigned int error_interrupt_enable,
86 unsigned int error_interrupt_offset)
87{
88 u64 paddr;
89
90 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
91 writeq(val: paddr, addr: &wq->ctrl->ring_base);
92 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
93 iowrite32(0, &wq->ctrl->fetch_index);
94 iowrite32(0, &wq->ctrl->posted_index);
95 iowrite32(cq_index, &wq->ctrl->cq_index);
96 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
97 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
98}
99

source code of linux/drivers/scsi/fnic/vnic_wq_copy.c