Merge branch 'topic/asoc' into for-linus
[linux-2.6] / drivers / scsi / fnic / vnic_rq.c
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 "vnic_dev.h"
24 #include "vnic_rq.h"
25
26 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
27 {
28         struct vnic_rq_buf *buf;
29         struct vnic_dev *vdev;
30         unsigned int i, j, count = rq->ring.desc_count;
31         unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
32
33         vdev = rq->vdev;
34
35         for (i = 0; i < blks; i++) {
36                 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
37                 if (!rq->bufs[i]) {
38                         printk(KERN_ERR "Failed to alloc rq_bufs\n");
39                         return -ENOMEM;
40                 }
41         }
42
43         for (i = 0; i < blks; i++) {
44                 buf = rq->bufs[i];
45                 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
46                         buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
47                         buf->desc = (u8 *)rq->ring.descs +
48                                 rq->ring.desc_size * buf->index;
49                         if (buf->index + 1 == count) {
50                                 buf->next = rq->bufs[0];
51                                 break;
52                         } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
53                                 buf->next = rq->bufs[i + 1];
54                         } else {
55                                 buf->next = buf + 1;
56                                 buf++;
57                         }
58                 }
59         }
60
61         rq->to_use = rq->to_clean = rq->bufs[0];
62         rq->buf_index = 0;
63
64         return 0;
65 }
66
67 void vnic_rq_free(struct vnic_rq *rq)
68 {
69         struct vnic_dev *vdev;
70         unsigned int i;
71
72         vdev = rq->vdev;
73
74         vnic_dev_free_desc_ring(vdev, &rq->ring);
75
76         for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
77                 kfree(rq->bufs[i]);
78                 rq->bufs[i] = NULL;
79         }
80
81         rq->ctrl = NULL;
82 }
83
84 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
85         unsigned int desc_count, unsigned int desc_size)
86 {
87         int err;
88
89         rq->index = index;
90         rq->vdev = vdev;
91
92         rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
93         if (!rq->ctrl) {
94                 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
95                 return -EINVAL;
96         }
97
98         vnic_rq_disable(rq);
99
100         err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
101         if (err)
102                 return err;
103
104         err = vnic_rq_alloc_bufs(rq);
105         if (err) {
106                 vnic_rq_free(rq);
107                 return err;
108         }
109
110         return 0;
111 }
112
113 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
114         unsigned int error_interrupt_enable,
115         unsigned int error_interrupt_offset)
116 {
117         u64 paddr;
118         u32 fetch_index;
119
120         paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
121         writeq(paddr, &rq->ctrl->ring_base);
122         iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
123         iowrite32(cq_index, &rq->ctrl->cq_index);
124         iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
125         iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
126         iowrite32(0, &rq->ctrl->dropped_packet_count);
127         iowrite32(0, &rq->ctrl->error_status);
128
129         /* Use current fetch_index as the ring starting point */
130         fetch_index = ioread32(&rq->ctrl->fetch_index);
131         rq->to_use = rq->to_clean =
132                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
133                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
134         iowrite32(fetch_index, &rq->ctrl->posted_index);
135
136         rq->buf_index = 0;
137 }
138
139 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
140 {
141         return ioread32(&rq->ctrl->error_status);
142 }
143
144 void vnic_rq_enable(struct vnic_rq *rq)
145 {
146         iowrite32(1, &rq->ctrl->enable);
147 }
148
149 int vnic_rq_disable(struct vnic_rq *rq)
150 {
151         unsigned int wait;
152
153         iowrite32(0, &rq->ctrl->enable);
154
155         /* Wait for HW to ACK disable request */
156         for (wait = 0; wait < 100; wait++) {
157                 if (!(ioread32(&rq->ctrl->running)))
158                         return 0;
159                 udelay(1);
160         }
161
162         printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
163
164         return -ETIMEDOUT;
165 }
166
167 void vnic_rq_clean(struct vnic_rq *rq,
168         void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
169 {
170         struct vnic_rq_buf *buf;
171         u32 fetch_index;
172
173         BUG_ON(ioread32(&rq->ctrl->enable));
174
175         buf = rq->to_clean;
176
177         while (vnic_rq_desc_used(rq) > 0) {
178
179                 (*buf_clean)(rq, buf);
180
181                 buf = rq->to_clean = buf->next;
182                 rq->ring.desc_avail++;
183         }
184
185         /* Use current fetch_index as the ring starting point */
186         fetch_index = ioread32(&rq->ctrl->fetch_index);
187         rq->to_use = rq->to_clean =
188                 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
189                         [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
190         iowrite32(fetch_index, &rq->ctrl->posted_index);
191
192         rq->buf_index = 0;
193
194         vnic_dev_clear_desc_ring(&rq->ring);
195 }
196