159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
/*
|
|
* Isochronous IO functionality
|
|
*
|
|
* 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"
|
|
|
|
int
|
|
fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
|
|
int page_count, enum dma_data_direction direction)
|
|
{
|
|
int i, j, retval = -ENOMEM;
|
|
dma_addr_t address;
|
|
|
|
buffer->page_count = page_count;
|
|
buffer->direction = direction;
|
|
|
|
buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
|
|
GFP_KERNEL);
|
|
if (buffer->pages == NULL)
|
|
goto out;
|
|
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
|
|
if (buffer->pages[i] == NULL)
|
|
goto out_pages;
|
|
|
|
address = dma_map_page(card->device, buffer->pages[i],
|
|
0, PAGE_SIZE, direction);
|
|
if (dma_mapping_error(address)) {
|
|
__free_page(buffer->pages[i]);
|
|
goto out_pages;
|
|
}
|
|
set_page_private(buffer->pages[i], address);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_pages:
|
|
for (j = 0; j < i; j++) {
|
|
address = page_private(buffer->pages[j]);
|
|
dma_unmap_page(card->device, address,
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
__free_page(buffer->pages[j]);
|
|
}
|
|
kfree(buffer->pages);
|
|
out:
|
|
buffer->pages = NULL;
|
|
return retval;
|
|
}
|
|
|
|
int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
|
|
{
|
|
unsigned long uaddr;
|
|
int i, retval;
|
|
|
|
uaddr = vma->vm_start;
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
retval = vm_insert_page(vma, uaddr, buffer->pages[i]);
|
|
if (retval)
|
|
return retval;
|
|
uaddr += PAGE_SIZE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
|
|
struct fw_card *card)
|
|
{
|
|
int i;
|
|
dma_addr_t address;
|
|
|
|
for (i = 0; i < buffer->page_count; i++) {
|
|
address = page_private(buffer->pages[i]);
|
|
dma_unmap_page(card->device, address,
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
__free_page(buffer->pages[i]);
|
|
}
|
|
|
|
kfree(buffer->pages);
|
|
buffer->pages = NULL;
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct fw_iso_context *ctx;
|
|
|
|
ctx = card->driver->allocate_iso_context(card, type, header_size);
|
|
if (IS_ERR(ctx))
|
|
return ctx;
|
|
|
|
ctx->card = card;
|
|
ctx->type = type;
|
|
ctx->channel = channel;
|
|
ctx->speed = speed;
|
|
ctx->header_size = header_size;
|
|
ctx->callback = callback;
|
|
ctx->callback_data = callback_data;
|
|
|
|
return ctx;
|
|
}
|
|
|
|
void fw_iso_context_destroy(struct fw_iso_context *ctx)
|
|
{
|
|
struct fw_card *card = ctx->card;
|
|
|
|
card->driver->free_iso_context(ctx);
|
|
}
|
|
|
|
int
|
|
fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags)
|
|
{
|
|
return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
|
|
}
|
|
|
|
int
|
|
fw_iso_context_queue(struct fw_iso_context *ctx,
|
|
struct fw_iso_packet *packet,
|
|
struct fw_iso_buffer *buffer,
|
|
unsigned long payload)
|
|
{
|
|
struct fw_card *card = ctx->card;
|
|
|
|
return card->driver->queue_iso(ctx, packet, buffer, payload);
|
|
}
|
|
|
|
int
|
|
fw_iso_context_stop(struct fw_iso_context *ctx)
|
|
{
|
|
return ctx->card->driver->stop_iso(ctx);
|
|
}
|