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#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/pci.h>
24#include <linux/delay.h>
25#include <linux/slab.h>
26
27#include "vnic_dev.h"
28#include "vnic_wq.h"
29
30static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
31{
32	struct vnic_wq_buf *buf;
33	struct vnic_dev *vdev;
34	unsigned int i, j, count = wq->ring.desc_count;
35	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
36
37	vdev = wq->vdev;
38
39	for (i = 0; i < blks; i++) {
40		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
41		if (!wq->bufs[i])
42			return -ENOMEM;
43	}
44
45	for (i = 0; i < blks; i++) {
46		buf = wq->bufs[i];
47		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
48			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
49			buf->desc = (u8 *)wq->ring.descs +
50				wq->ring.desc_size * buf->index;
51			if (buf->index + 1 == count) {
52				buf->next = wq->bufs[0];
53				break;
54			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
55				buf->next = wq->bufs[i + 1];
56			} else {
57				buf->next = buf + 1;
58				buf++;
59			}
60		}
61	}
62
63	wq->to_use = wq->to_clean = wq->bufs[0];
64
65	return 0;
66}
67
68void vnic_wq_free(struct vnic_wq *wq)
69{
70	struct vnic_dev *vdev;
71	unsigned int i;
72
73	vdev = wq->vdev;
74
75	vnic_dev_free_desc_ring(vdev, &wq->ring);
76
77	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
78		if (wq->bufs[i]) {
79			kfree(wq->bufs[i]);
80			wq->bufs[i] = NULL;
81		}
82	}
83
84	wq->ctrl = NULL;
85}
86
87int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
88	unsigned int desc_count, unsigned int desc_size)
89{
90	int err;
91
92	wq->index = index;
93	wq->vdev = vdev;
94
95	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
96	if (!wq->ctrl) {
97		pr_err("Failed to hook WQ[%d] resource\n", index);
98		return -EINVAL;
99	}
100
101	vnic_wq_disable(wq);
102
103	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
104	if (err)
105		return err;
106
107	err = vnic_wq_alloc_bufs(wq);
108	if (err) {
109		vnic_wq_free(wq);
110		return err;
111	}
112
113	return 0;
114}
115
116static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
117	unsigned int fetch_index, unsigned int posted_index,
118	unsigned int error_interrupt_enable,
119	unsigned int error_interrupt_offset)
120{
121	u64 paddr;
122	unsigned int count = wq->ring.desc_count;
123
124	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
125	writeq(paddr, &wq->ctrl->ring_base);
126	iowrite32(count, &wq->ctrl->ring_size);
127	iowrite32(fetch_index, &wq->ctrl->fetch_index);
128	iowrite32(posted_index, &wq->ctrl->posted_index);
129	iowrite32(cq_index, &wq->ctrl->cq_index);
130	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
131	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
132	iowrite32(0, &wq->ctrl->error_status);
133
134	wq->to_use = wq->to_clean =
135		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
136			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
137}
138
139void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
140	unsigned int error_interrupt_enable,
141	unsigned int error_interrupt_offset)
142{
143	vnic_wq_init_start(wq, cq_index, 0, 0,
144		error_interrupt_enable,
145		error_interrupt_offset);
146}
147
148unsigned int vnic_wq_error_status(struct vnic_wq *wq)
149{
150	return ioread32(&wq->ctrl->error_status);
151}
152
153void vnic_wq_enable(struct vnic_wq *wq)
154{
155	iowrite32(1, &wq->ctrl->enable);
156}
157
158int vnic_wq_disable(struct vnic_wq *wq)
159{
160	unsigned int wait;
161
162	iowrite32(0, &wq->ctrl->enable);
163
164	/* Wait for HW to ACK disable request */
165	for (wait = 0; wait < 1000; wait++) {
166		if (!(ioread32(&wq->ctrl->running)))
167			return 0;
168		udelay(10);
169	}
170
171	pr_err("Failed to disable WQ[%d]\n", wq->index);
172
173	return -ETIMEDOUT;
174}
175
176void vnic_wq_clean(struct vnic_wq *wq,
177	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
178{
179	struct vnic_wq_buf *buf;
180
181	buf = wq->to_clean;
182
183	while (vnic_wq_desc_used(wq) > 0) {
184
185		(*buf_clean)(wq, buf);
186
187		buf = wq->to_clean = buf->next;
188		wq->ring.desc_avail++;
189	}
190
191	wq->to_use = wq->to_clean = wq->bufs[0];
192
193	iowrite32(0, &wq->ctrl->fetch_index);
194	iowrite32(0, &wq->ctrl->posted_index);
195	iowrite32(0, &wq->ctrl->error_status);
196
197	vnic_dev_clear_desc_ring(&wq->ring);
198}
199