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
31int
32fw_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
75int 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
91void 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
108struct fw_iso_context *
109fw_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}
129EXPORT_SYMBOL(fw_iso_context_create);
130
131void fw_iso_context_destroy(struct fw_iso_context *ctx)
132{
133	struct fw_card *card = ctx->card;
134
135	card->driver->free_iso_context(ctx);
136}
137EXPORT_SYMBOL(fw_iso_context_destroy);
138
139int
140fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags)
141{
142	return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
143}
144EXPORT_SYMBOL(fw_iso_context_start);
145
146int
147fw_iso_context_queue(struct fw_iso_context *ctx,
148		     struct fw_iso_packet *packet,
149		     struct fw_iso_buffer *buffer,
150		     unsigned long payload)
151{
152	struct fw_card *card = ctx->card;
153
154	return card->driver->queue_iso(ctx, packet, buffer, payload);
155}
156EXPORT_SYMBOL(fw_iso_context_queue);
157
158int
159fw_iso_context_stop(struct fw_iso_context *ctx)
160{
161	return ctx->card->driver->stop_iso(ctx);
162}
163EXPORT_SYMBOL(fw_iso_context_stop);
164