164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/*
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* Isochronous IO functionality
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*
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* Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include "fw-transaction.h"
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#include "fw-topology.h"
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#include "fw-device.h"
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int
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fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
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int page_count, enum dma_data_direction direction)
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{
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int i, j, retval = -ENOMEM;
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dma_addr_t address;
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buffer->page_count = page_count;
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buffer->direction = direction;
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buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
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GFP_KERNEL);
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if (buffer->pages == NULL)
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goto out;
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for (i = 0; i < buffer->page_count; i++) {
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buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
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if (buffer->pages[i] == NULL)
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goto out_pages;
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address = dma_map_page(card->device, buffer->pages[i],
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0, PAGE_SIZE, direction);
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if (dma_mapping_error(address)) {
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__free_page(buffer->pages[i]);
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goto out_pages;
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}
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set_page_private(buffer->pages[i], address);
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}
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return 0;
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out_pages:
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for (j = 0; j < i; j++) {
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address = page_private(buffer->pages[j]);
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dma_unmap_page(card->device, address,
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PAGE_SIZE, DMA_TO_DEVICE);
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__free_page(buffer->pages[j]);
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}
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kfree(buffer->pages);
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out:
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buffer->pages = NULL;
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return retval;
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}
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int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
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{
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unsigned long uaddr;
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int i, retval;
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uaddr = vma->vm_start;
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for (i = 0; i < buffer->page_count; i++) {
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retval = vm_insert_page(vma, uaddr, buffer->pages[i]);
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if (retval)
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return retval;
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uaddr += PAGE_SIZE;
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}
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return 0;
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}
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void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
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struct fw_card *card)
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{
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int i;
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dma_addr_t address;
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for (i = 0; i < buffer->page_count; i++) {
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address = page_private(buffer->pages[i]);
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dma_unmap_page(card->device, address,
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PAGE_SIZE, DMA_TO_DEVICE);
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__free_page(buffer->pages[i]);
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}
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kfree(buffer->pages);
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buffer->pages = NULL;
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}
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struct fw_iso_context *
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fw_iso_context_create(struct fw_card *card, int type,
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int channel, int speed, size_t header_size,
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fw_iso_callback_t callback, void *callback_data)
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{
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struct fw_iso_context *ctx;
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ctx = card->driver->allocate_iso_context(card, type, header_size);
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if (IS_ERR(ctx))
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return ctx;
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ctx->card = card;
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ctx->type = type;
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ctx->channel = channel;
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ctx->speed = speed;
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ctx->header_size = header_size;
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ctx->callback = callback;
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ctx->callback_data = callback_data;
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return ctx;
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}
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EXPORT_SYMBOL(fw_iso_context_create);
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void fw_iso_context_destroy(struct fw_iso_context *ctx)
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{
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struct fw_card *card = ctx->card;
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card->driver->free_iso_context(ctx);
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}
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EXPORT_SYMBOL(fw_iso_context_destroy);
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int
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fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags)
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{
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return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
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}
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EXPORT_SYMBOL(fw_iso_context_start);
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int
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fw_iso_context_queue(struct fw_iso_context *ctx,
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struct fw_iso_packet *packet,
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struct fw_iso_buffer *buffer,
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unsigned long payload)
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{
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struct fw_card *card = ctx->card;
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return card->driver->queue_iso(ctx, packet, buffer, payload);
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}
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EXPORT_SYMBOL(fw_iso_context_queue);
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int
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fw_iso_context_stop(struct fw_iso_context *ctx)
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{
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return ctx->card->driver->stop_iso(ctx);
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}
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EXPORT_SYMBOL(fw_iso_context_stop);
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