firewire: Add core firewire stack.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 136 insertions, 0 deletions

diff --git a/drivers/firewire/fw-iso.c b/drivers/firewire/fw-iso.c
new file mode 100644
index 000000000000..61548c4d18ec
--- /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);