1/*
2 * Copyright 2008 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#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/pci.h>
22#include <linux/delay.h>
23#include <linux/slab.h>
24#include "vnic_dev.h"
25#include "vnic_wq.h"
26
27static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
28{
29	struct vnic_wq_buf *buf;
30	struct vnic_dev *vdev;
31	unsigned int i, j, count = wq->ring.desc_count;
32	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
33
34	vdev = wq->vdev;
35
36	for (i = 0; i < blks; i++) {
37		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
38		if (!wq->bufs[i]) {
39			printk(KERN_ERR "Failed to alloc wq_bufs\n");
40			return -ENOMEM;
41		}
42	}
43
44	for (i = 0; i < blks; i++) {
45		buf = wq->bufs[i];
46		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
47			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
48			buf->desc = (u8 *)wq->ring.descs +
49				wq->ring.desc_size * buf->index;
50			if (buf->index + 1 == count) {
51				buf->next = wq->bufs[0];
52				break;
53			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
54				buf->next = wq->bufs[i + 1];
55			} else {
56				buf->next = buf + 1;
57				buf++;
58			}
59		}
60	}
61
62	wq->to_use = wq->to_clean = wq->bufs[0];
63
64	return 0;
65}
66
67void vnic_wq_free(struct vnic_wq *wq)
68{
69	struct vnic_dev *vdev;
70	unsigned int i;
71
72	vdev = wq->vdev;
73
74	vnic_dev_free_desc_ring(vdev, &wq->ring);
75
76	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
77		kfree(wq->bufs[i]);
78		wq->bufs[i] = NULL;
79	}
80
81	wq->ctrl = NULL;
82
83}
84
85int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
86	unsigned int desc_count, unsigned int desc_size)
87{
88	int err;
89
90	wq->index = index;
91	wq->vdev = vdev;
92
93	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
94	if (!wq->ctrl) {
95		printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
96		return -EINVAL;
97	}
98
99	vnic_wq_disable(wq);
100
101	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
102	if (err)
103		return err;
104
105	err = vnic_wq_alloc_bufs(wq);
106	if (err) {
107		vnic_wq_free(wq);
108		return err;
109	}
110
111	return 0;
112}
113
114void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
115	unsigned int error_interrupt_enable,
116	unsigned int error_interrupt_offset)
117{
118	u64 paddr;
119
120	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
121	writeq(paddr, &wq->ctrl->ring_base);
122	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
123	iowrite32(0, &wq->ctrl->fetch_index);
124	iowrite32(0, &wq->ctrl->posted_index);
125	iowrite32(cq_index, &wq->ctrl->cq_index);
126	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
127	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
128	iowrite32(0, &wq->ctrl->error_status);
129}
130
131unsigned int vnic_wq_error_status(struct vnic_wq *wq)
132{
133	return ioread32(&wq->ctrl->error_status);
134}
135
136void vnic_wq_enable(struct vnic_wq *wq)
137{
138	iowrite32(1, &wq->ctrl->enable);
139}
140
141int vnic_wq_disable(struct vnic_wq *wq)
142{
143	unsigned int wait;
144
145	iowrite32(0, &wq->ctrl->enable);
146
147	/* Wait for HW to ACK disable request */
148	for (wait = 0; wait < 100; wait++) {
149		if (!(ioread32(&wq->ctrl->running)))
150			return 0;
151		udelay(1);
152	}
153
154	printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
155
156	return -ETIMEDOUT;
157}
158
159void vnic_wq_clean(struct vnic_wq *wq,
160	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
161{
162	struct vnic_wq_buf *buf;
163
164	BUG_ON(ioread32(&wq->ctrl->enable));
165
166	buf = wq->to_clean;
167
168	while (vnic_wq_desc_used(wq) > 0) {
169
170		(*buf_clean)(wq, buf);
171
172		buf = wq->to_clean = buf->next;
173		wq->ring.desc_avail++;
174	}
175
176	wq->to_use = wq->to_clean = wq->bufs[0];
177
178	iowrite32(0, &wq->ctrl->fetch_index);
179	iowrite32(0, &wq->ctrl->posted_index);
180	iowrite32(0, &wq->ctrl->error_status);
181
182	vnic_dev_clear_desc_ring(&wq->ring);
183}
184