firewire: Add core firewire stack.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-iso.c b/drivers/firewire/fw-iso.c
new file mode 100644
index 0000000..61548c4
--- /dev/null
+++ b/drivers/firewire/fw-iso.c
@@ -0,0 +1,136 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-iso.c - Isochronous IO
+ * 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"
+
+static int
+setup_iso_buffer(struct fw_iso_context *ctx, size_t size,
+ enum dma_data_direction direction)
+{
+ struct page *page;
+ int i;
+ void *p;
+
+ ctx->buffer_size = PAGE_ALIGN(size);
+ if (size == 0)
+ return 0;
+
+ ctx->buffer = vmalloc_32_user(ctx->buffer_size);
+ if (ctx->buffer == NULL)
+ return -ENOMEM;
+
+ ctx->page_count = ctx->buffer_size >> PAGE_SHIFT;
+ ctx->pages =
+ kzalloc(ctx->page_count * sizeof(ctx->pages[0]), GFP_KERNEL);
+ if (ctx->pages == NULL) {
+ vfree(ctx->buffer);
+ return -ENOMEM;
+ }
+
+ p = ctx->buffer;
+ for (i = 0; i < ctx->page_count; i++, p += PAGE_SIZE) {
+ page = vmalloc_to_page(p);
+ ctx->pages[i] = dma_map_page(ctx->card->device,
+ page, 0, PAGE_SIZE, direction);
+ }
+
+ return 0;
+}
+
+static void destroy_iso_buffer(struct fw_iso_context *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->page_count; i++)
+ dma_unmap_page(ctx->card->device, ctx->pages[i],
+ PAGE_SIZE, DMA_TO_DEVICE);
+
+ kfree(ctx->pages);
+ vfree(ctx->buffer);
+}
+
+struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
+ size_t buffer_size,
+ fw_iso_callback_t callback,
+ void *callback_data)
+{
+ struct fw_iso_context *ctx;
+ int retval;
+
+ ctx = card->driver->allocate_iso_context(card, type);
+ if (IS_ERR(ctx))
+ return ctx;
+
+ ctx->card = card;
+ ctx->type = type;
+ ctx->callback = callback;
+ ctx->callback_data = callback_data;
+
+ retval = setup_iso_buffer(ctx, buffer_size, DMA_TO_DEVICE);
+ if (retval < 0) {
+ card->driver->free_iso_context(ctx);
+ return ERR_PTR(retval);
+ }
+
+ return ctx;
+}
+
+EXPORT_SYMBOL(fw_iso_context_create);
+
+void fw_iso_context_destroy(struct fw_iso_context *ctx)
+{
+ struct fw_card *card = ctx->card;
+
+ destroy_iso_buffer(ctx);
+
+ card->driver->free_iso_context(ctx);
+}
+
+EXPORT_SYMBOL(fw_iso_context_destroy);
+
+int
+fw_iso_context_send(struct fw_iso_context *ctx,
+ int channel, int speed, int cycle)
+{
+ ctx->channel = channel;
+ ctx->speed = speed;
+
+ return ctx->card->driver->send_iso(ctx, cycle);
+}
+
+EXPORT_SYMBOL(fw_iso_context_send);
+
+int
+fw_iso_context_queue(struct fw_iso_context *ctx,
+ struct fw_iso_packet *packet, void *payload)
+{
+ struct fw_card *card = ctx->card;
+
+ return card->driver->queue_iso(ctx, packet, payload);
+}
+
+EXPORT_SYMBOL(fw_iso_context_queue);
