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/* -*- c-basic-offset: 8 -*-
*
* fw-iso.c - Isochronous IO
* Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"
static int
setup_iso_buffer(struct fw_iso_context *ctx, size_t size,
enum dma_data_direction direction)
{
struct page *page;
int i, j;
void *p;
ctx->buffer_size = PAGE_ALIGN(size);
if (size == 0)
return 0;
ctx->buffer = vmalloc_32_user(ctx->buffer_size);
if (ctx->buffer == NULL)
goto fail_buffer_alloc;
ctx->page_count = ctx->buffer_size >> PAGE_SHIFT;
ctx->pages =
kzalloc(ctx->page_count * sizeof(ctx->pages[0]), GFP_KERNEL);
if (ctx->pages == NULL)
goto fail_pages_alloc;
p = ctx->buffer;
for (i = 0; i < ctx->page_count; i++, p += PAGE_SIZE) {
page = vmalloc_to_page(p);
ctx->pages[i] = dma_map_page(ctx->card->device,
page, 0, PAGE_SIZE, direction);
if (dma_mapping_error(ctx->pages[i]))
goto fail_mapping;
}
return 0;
fail_mapping:
for (j = 0; j < i; j++)
dma_unmap_page(ctx->card->device, ctx->pages[j],
PAGE_SIZE, DMA_TO_DEVICE);
fail_pages_alloc:
vfree(ctx->buffer);
fail_buffer_alloc:
return -ENOMEM;
}
static void destroy_iso_buffer(struct fw_iso_context *ctx)
{
int i;
for (i = 0; i < ctx->page_count; i++)
dma_unmap_page(ctx->card->device, ctx->pages[i],
PAGE_SIZE, DMA_TO_DEVICE);
kfree(ctx->pages);
vfree(ctx->buffer);
}
struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
size_t buffer_size,
fw_iso_callback_t callback,
void *callback_data)
{
struct fw_iso_context *ctx;
int retval;
ctx = card->driver->allocate_iso_context(card, type);
if (IS_ERR(ctx))
return ctx;
ctx->card = card;
ctx->type = type;
ctx->callback = callback;
ctx->callback_data = callback_data;
retval = setup_iso_buffer(ctx, buffer_size, DMA_TO_DEVICE);
if (retval < 0) {
card->driver->free_iso_context(ctx);
return ERR_PTR(retval);
}
return ctx;
}
EXPORT_SYMBOL(fw_iso_context_create);
void fw_iso_context_destroy(struct fw_iso_context *ctx)
{
struct fw_card *card = ctx->card;
destroy_iso_buffer(ctx);
card->driver->free_iso_context(ctx);
}
EXPORT_SYMBOL(fw_iso_context_destroy);
int
fw_iso_context_send(struct fw_iso_context *ctx,
int channel, int speed, int cycle)
{
ctx->channel = channel;
ctx->speed = speed;
return ctx->card->driver->send_iso(ctx, cycle);
}
EXPORT_SYMBOL(fw_iso_context_send);
int
fw_iso_context_queue(struct fw_iso_context *ctx,
struct fw_iso_packet *packet, void *payload)
{
struct fw_card *card = ctx->card;
return card->driver->queue_iso(ctx, packet, payload);
}
EXPORT_SYMBOL(fw_iso_context_queue);
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