2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
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.
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
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>
30 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
32 struct vnic_wq_buf *buf;
33 unsigned int i, j, count = wq->ring.desc_count;
34 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
36 for (i = 0; i < blks; i++) {
37 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
42 for (i = 0; i < blks; i++) {
44 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
45 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
46 buf->desc = (u8 *)wq->ring.descs +
47 wq->ring.desc_size * buf->index;
48 if (buf->index + 1 == count) {
49 buf->next = wq->bufs[0];
51 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
52 buf->next = wq->bufs[i + 1];
60 wq->to_use = wq->to_clean = wq->bufs[0];
65 void vnic_wq_free(struct vnic_wq *wq)
67 struct vnic_dev *vdev;
72 vnic_dev_free_desc_ring(vdev, &wq->ring);
74 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
84 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
85 unsigned int desc_count, unsigned int desc_size)
92 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
94 pr_err("Failed to hook WQ[%d] resource\n", index);
100 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
104 err = vnic_wq_alloc_bufs(wq);
113 static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
114 unsigned int fetch_index, unsigned int posted_index,
115 unsigned int error_interrupt_enable,
116 unsigned int error_interrupt_offset)
119 unsigned int count = wq->ring.desc_count;
121 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
122 writeq(paddr, &wq->ctrl->ring_base);
123 iowrite32(count, &wq->ctrl->ring_size);
124 iowrite32(fetch_index, &wq->ctrl->fetch_index);
125 iowrite32(posted_index, &wq->ctrl->posted_index);
126 iowrite32(cq_index, &wq->ctrl->cq_index);
127 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
128 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
129 iowrite32(0, &wq->ctrl->error_status);
131 wq->to_use = wq->to_clean =
132 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
133 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
136 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
137 unsigned int error_interrupt_enable,
138 unsigned int error_interrupt_offset)
140 vnic_wq_init_start(wq, cq_index, 0, 0,
141 error_interrupt_enable,
142 error_interrupt_offset);
145 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
147 return ioread32(&wq->ctrl->error_status);
150 void vnic_wq_enable(struct vnic_wq *wq)
152 iowrite32(1, &wq->ctrl->enable);
155 int vnic_wq_disable(struct vnic_wq *wq)
159 iowrite32(0, &wq->ctrl->enable);
161 /* Wait for HW to ACK disable request */
162 for (wait = 0; wait < 1000; wait++) {
163 if (!(ioread32(&wq->ctrl->running)))
168 pr_err("Failed to disable WQ[%d]\n", wq->index);
173 void vnic_wq_clean(struct vnic_wq *wq,
174 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
176 struct vnic_wq_buf *buf;
180 while (vnic_wq_desc_used(wq) > 0) {
182 (*buf_clean)(wq, buf);
184 buf = wq->to_clean = buf->next;
185 wq->ring.desc_avail++;
188 wq->to_use = wq->to_clean = wq->bufs[0];
190 iowrite32(0, &wq->ctrl->fetch_index);
191 iowrite32(0, &wq->ctrl->posted_index);
192 iowrite32(0, &wq->ctrl->error_status);
194 vnic_dev_clear_desc_ring(&wq->ring);