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
fw_iso_buffer_init(struct fw_iso_buffer * buffer,struct fw_card * card,int page_count,enum dma_data_direction direction)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(card->device, 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
fw_iso_buffer_map(struct fw_iso_buffer * buffer,struct vm_area_struct * vma)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
fw_iso_buffer_destroy(struct fw_iso_buffer * buffer,struct fw_card * card)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 *
fw_iso_context_create(struct fw_card * card,int type,int channel,int speed,size_t header_size,fw_iso_callback_t callback,void * callback_data)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
fw_iso_context_destroy(struct fw_iso_context * ctx)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
fw_iso_context_start(struct fw_iso_context * ctx,int cycle,int sync,int tags)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
fw_iso_context_queue(struct fw_iso_context * ctx,struct fw_iso_packet * packet,struct fw_iso_buffer * buffer,unsigned long payload)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
fw_iso_context_stop(struct fw_iso_context * ctx)155 fw_iso_context_stop(struct fw_iso_context *ctx)
156 {
157 return ctx->card->driver->stop_iso(ctx);
158 }
159