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, -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
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, &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, 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
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(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