Pileus Git - ~andy/linux/blob - drivers/firewire/fw-iso.c

   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
  31 int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
  32                        int page_count, enum dma_data_direction direction)
  33 {
  34         int i, j;
  35         dma_addr_t address;
  36
  37         buffer->page_count = page_count;
  38         buffer->direction = direction;
  39
  40         buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
  41                                 GFP_KERNEL);
  42         if (buffer->pages == NULL)
  43                 goto out;
  44
  45         for (i = 0; i < buffer->page_count; i++) {
  46                 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
  47                 if (buffer->pages[i] == NULL)
  48                         goto out_pages;
  49
  50                 address = dma_map_page(card->device, buffer->pages[i],
  51                                        0, PAGE_SIZE, direction);
  52                 if (dma_mapping_error(card->device, address)) {
  53                         __free_page(buffer->pages[i]);
  54                         goto out_pages;
  55                 }
  56                 set_page_private(buffer->pages[i], address);
  57         }
  58
  59         return 0;
  60
  61  out_pages:
  62         for (j = 0; j < i; j++) {
  63                 address = page_private(buffer->pages[j]);
  64                 dma_unmap_page(card->device, address,
  65                                PAGE_SIZE, DMA_TO_DEVICE);
  66                 __free_page(buffer->pages[j]);
  67         }
  68         kfree(buffer->pages);
  69  out:
  70         buffer->pages = NULL;
  71         return -ENOMEM;
  72 }
  73
  74 int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
  75 {
  76         unsigned long uaddr;
  77         int i, ret;
  78
  79         uaddr = vma->vm_start;
  80         for (i = 0; i < buffer->page_count; i++) {
  81                 ret = vm_insert_page(vma, uaddr, buffer->pages[i]);
  82                 if (ret)
  83                         return ret;
  84                 uaddr += PAGE_SIZE;
  85         }
  86
  87         return 0;
  88 }
  89
  90 void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
  91                            struct fw_card *card)
  92 {
  93         int i;
  94         dma_addr_t address;
  95
  96         for (i = 0; i < buffer->page_count; i++) {
  97                 address = page_private(buffer->pages[i]);
  98                 dma_unmap_page(card->device, address,
  99                                PAGE_SIZE, DMA_TO_DEVICE);
 100                 __free_page(buffer->pages[i]);
 101         }
 102
 103         kfree(buffer->pages);
 104         buffer->pages = NULL;
 105 }
 106
 107 struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
 108                 int type, int channel, int speed, size_t header_size,
 109                 fw_iso_callback_t callback, void *callback_data)
 110 {
 111         struct fw_iso_context *ctx;
 112
 113         ctx = card->driver->allocate_iso_context(card, type, header_size);
 114         if (IS_ERR(ctx))
 115                 return ctx;
 116
 117         ctx->card = card;
 118         ctx->type = type;
 119         ctx->channel = channel;
 120         ctx->speed = speed;
 121         ctx->header_size = header_size;
 122         ctx->callback = callback;
 123         ctx->callback_data = callback_data;
 124
 125         return ctx;
 126 }
 127
 128 void fw_iso_context_destroy(struct fw_iso_context *ctx)
 129 {
 130         struct fw_card *card = ctx->card;
 131
 132         card->driver->free_iso_context(ctx);
 133 }
 134
 135 int fw_iso_context_start(struct fw_iso_context *ctx,
 136                          int cycle, int sync, int tags)
 137 {
 138         return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
 139 }
 140
 141 int fw_iso_context_queue(struct fw_iso_context *ctx,
 142                          struct fw_iso_packet *packet,
 143                          struct fw_iso_buffer *buffer,
 144                          unsigned long payload)
 145 {
 146         struct fw_card *card = ctx->card;
 147
 148         return card->driver->queue_iso(ctx, packet, buffer, payload);
 149 }
 150
 151 int fw_iso_context_stop(struct fw_iso_context *ctx)
 152 {
 153         return ctx->card->driver->stop_iso(ctx);
 154 }