Merge branch 'linus' into cpus4096
[linux-2.6] / drivers / firewire / fw-iso.c
1 /*
2  * Isochronous IO functionality
3  *
4  * Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/vmalloc.h>
25 #include <linux/mm.h>
26
27 #include "fw-transaction.h"
28 #include "fw-topology.h"
29 #include "fw-device.h"
30
31 int
32 fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
33                    int page_count, enum dma_data_direction direction)
34 {
35         int i, j, retval = -ENOMEM;
36         dma_addr_t address;
37
38         buffer->page_count = page_count;
39         buffer->direction = direction;
40
41         buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
42                                 GFP_KERNEL);
43         if (buffer->pages == NULL)
44                 goto out;
45
46         for (i = 0; i < buffer->page_count; i++) {
47                 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
48                 if (buffer->pages[i] == NULL)
49                         goto out_pages;
50
51                 address = dma_map_page(card->device, buffer->pages[i],
52                                        0, PAGE_SIZE, direction);
53                 if (dma_mapping_error(address)) {
54                         __free_page(buffer->pages[i]);
55                         goto out_pages;
56                 }
57                 set_page_private(buffer->pages[i], address);
58         }
59
60         return 0;
61
62  out_pages:
63         for (j = 0; j < i; j++) {
64                 address = page_private(buffer->pages[j]);
65                 dma_unmap_page(card->device, address,
66                                PAGE_SIZE, DMA_TO_DEVICE);
67                 __free_page(buffer->pages[j]);
68         }
69         kfree(buffer->pages);
70  out:
71         buffer->pages = NULL;
72         return retval;
73 }
74
75 int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
76 {
77         unsigned long uaddr;
78         int i, retval;
79
80         uaddr = vma->vm_start;
81         for (i = 0; i < buffer->page_count; i++) {
82                 retval = vm_insert_page(vma, uaddr, buffer->pages[i]);
83                 if (retval)
84                         return retval;
85                 uaddr += PAGE_SIZE;
86         }
87
88         return 0;
89 }
90
91 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
92                            struct fw_card *card)
93 {
94         int i;
95         dma_addr_t address;
96
97         for (i = 0; i < buffer->page_count; i++) {
98                 address = page_private(buffer->pages[i]);
99                 dma_unmap_page(card->device, address,
100                                PAGE_SIZE, DMA_TO_DEVICE);
101                 __free_page(buffer->pages[i]);
102         }
103
104         kfree(buffer->pages);
105         buffer->pages = NULL;
106 }
107
108 struct fw_iso_context *
109 fw_iso_context_create(struct fw_card *card, int type,
110                       int channel, int speed, size_t header_size,
111                       fw_iso_callback_t callback, void *callback_data)
112 {
113         struct fw_iso_context *ctx;
114
115         ctx = card->driver->allocate_iso_context(card, type, header_size);
116         if (IS_ERR(ctx))
117                 return ctx;
118
119         ctx->card = card;
120         ctx->type = type;
121         ctx->channel = channel;
122         ctx->speed = speed;
123         ctx->header_size = header_size;
124         ctx->callback = callback;
125         ctx->callback_data = callback_data;
126
127         return ctx;
128 }
129
130 void fw_iso_context_destroy(struct fw_iso_context *ctx)
131 {
132         struct fw_card *card = ctx->card;
133
134         card->driver->free_iso_context(ctx);
135 }
136
137 int
138 fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags)
139 {
140         return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
141 }
142
143 int
144 fw_iso_context_queue(struct fw_iso_context *ctx,
145                      struct fw_iso_packet *packet,
146                      struct fw_iso_buffer *buffer,
147                      unsigned long payload)
148 {
149         struct fw_card *card = ctx->card;
150
151         return card->driver->queue_iso(ctx, packet, buffer, payload);
152 }
153
154 int
155 fw_iso_context_stop(struct fw_iso_context *ctx)
156 {
157         return ctx->card->driver->stop_iso(ctx);
158 }