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fw-iso.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;
}
EXPORT_SYMBOL(fw_iso_context_create);

void fw_iso_context_destroy(struct fw_iso_context *ctx)
{
      struct fw_card *card = ctx->card;

      card->driver->free_iso_context(ctx);
}
EXPORT_SYMBOL(fw_iso_context_destroy);

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);
}
EXPORT_SYMBOL(fw_iso_context_start);

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);
}
EXPORT_SYMBOL(fw_iso_context_queue);

int
fw_iso_context_stop(struct fw_iso_context *ctx)
{
      return ctx->card->driver->stop_iso(ctx);
}
EXPORT_SYMBOL(fw_iso_context_stop);

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