[deliverable/linux.git] / drivers / firewire / fw-iso.c

/*						-*- 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"
#include "fw-device.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);
Commit	Line	Data
3038e353 KH	1	/* -- c-basic-offset: 8 --
	2	*
	3	* fw-iso.c - Isochronous IO
	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"
19a15b93	29	#include "fw-device.h"
3038e353 KH	30
	31	static int
	32	setup_iso_buffer(struct fw_iso_context *ctx, size_t size,
	33	enum dma_data_direction direction)
	34	{
	35	struct page *page;
	36	int i;
	37	void *p;
	38
	39	ctx->buffer_size = PAGE_ALIGN(size);
	40	if (size == 0)
	41	return 0;
	42
	43	ctx->buffer = vmalloc_32_user(ctx->buffer_size);
	44	if (ctx->buffer == NULL)
	45	return -ENOMEM;
	46
	47	ctx->page_count = ctx->buffer_size >> PAGE_SHIFT;
	48	ctx->pages =
	49	kzalloc(ctx->page_count * sizeof(ctx->pages[0]), GFP_KERNEL);
	50	if (ctx->pages == NULL) {
	51	vfree(ctx->buffer);
	52	return -ENOMEM;
	53	}
	54
	55	p = ctx->buffer;
	56	for (i = 0; i < ctx->page_count; i++, p += PAGE_SIZE) {
	57	page = vmalloc_to_page(p);
	58	ctx->pages[i] = dma_map_page(ctx->card->device,
	59	page, 0, PAGE_SIZE, direction);
	60	}
	61
	62	return 0;
	63	}
	64
	65	static void destroy_iso_buffer(struct fw_iso_context *ctx)
	66	{
	67	int i;
	68
	69	for (i = 0; i < ctx->page_count; i++)
	70	dma_unmap_page(ctx->card->device, ctx->pages[i],
	71	PAGE_SIZE, DMA_TO_DEVICE);
	72
	73	kfree(ctx->pages);
	74	vfree(ctx->buffer);
	75	}
	76
	77	struct fw_iso_context fw_iso_context_create(struct fw_card card, int type,
	78	size_t buffer_size,
	79	fw_iso_callback_t callback,
	80	void *callback_data)
	81	{
	82	struct fw_iso_context *ctx;
	83	int retval;
	84
	85	ctx = card->driver->allocate_iso_context(card, type);
	86	if (IS_ERR(ctx))
	87	return ctx;
	88
	89	ctx->card = card;
	90	ctx->type = type;
	91	ctx->callback = callback;
	92	ctx->callback_data = callback_data;
	93
94	retval = setup_iso_buffer(ctx, buffer_size, DMA_TO_DEVICE);
95	if (retval < 0) {
96	card->driver->free_iso_context(ctx);
97	return ERR_PTR(retval);
98	}
99
100	return ctx;
101	}
3038e353 KH	102	EXPORT_SYMBOL(fw_iso_context_create);
	103
	104	void fw_iso_context_destroy(struct fw_iso_context *ctx)
	105	{
	106	struct fw_card *card = ctx->card;
	107
	108	destroy_iso_buffer(ctx);
	109
	110	card->driver->free_iso_context(ctx);
	111	}
3038e353 KH	112	EXPORT_SYMBOL(fw_iso_context_destroy);
	113
	114	int
	115	fw_iso_context_send(struct fw_iso_context *ctx,
	116	int channel, int speed, int cycle)
	117	{
	118	ctx->channel = channel;
	119	ctx->speed = speed;
	120
	121	return ctx->card->driver->send_iso(ctx, cycle);
	122	}
3038e353 KH	123	EXPORT_SYMBOL(fw_iso_context_send);
	124
	125	int
	126	fw_iso_context_queue(struct fw_iso_context *ctx,
	127	struct fw_iso_packet packet, void payload)
	128	{
	129	struct fw_card *card = ctx->card;
	130
	131	return card->driver->queue_iso(ctx, packet, payload);
	132	}
3038e353	133	EXPORT_SYMBOL(fw_iso_context_queue);