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
vnic_wq_copy_enable(struct vnic_wq_copy * wq)13 void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
14 {
15 iowrite32(1, &wq->ctrl->enable);
16 }
17
vnic_wq_copy_disable(struct vnic_wq_copy * wq)18 int 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
vnic_wq_copy_clean(struct vnic_wq_copy * wq,void (* q_clean)(struct vnic_wq_copy * wq,struct fcpio_host_req * wq_desc))39 void 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, -1, 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(&wq->ring);
55 }
56
vnic_wq_copy_free(struct vnic_wq_copy * wq)57 void 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, &wq->ring);
63 wq->ctrl = NULL;
64 }
65
vnic_wq_copy_alloc(struct vnic_dev * vdev,struct vnic_wq_copy * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)66 int 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, 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, &wq->ring, desc_count, desc_size);
82 }
83
vnic_wq_copy_init(struct vnic_wq_copy * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)84 void 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(paddr, &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