/* * 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(card->device, 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); }