path: root/drivers/ieee1394/dv1394-private.h

/*
 * dv1394-private.h - DV input/output over IEEE 1394 on OHCI chips
 *   Copyright (C)2001 Daniel Maas <dmaas@dcine.com>
 *     receive by Dan Dennedy <dan@dennedy.org>
 *
 * based on:
 *   video1394.h - driver for OHCI 1394 boards
 *   Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
 *                          Peter Schlaile <udbz@rz.uni-karlsruhe.de>
 *
 * 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.
 */

#ifndef _DV_1394_PRIVATE_H
#define _DV_1394_PRIVATE_H

#include "ieee1394.h"
#include "ohci1394.h"
#include "dma.h"

/* data structures private to the dv1394 driver */
/* none of this is exposed to user-space */


/*
   the 8-byte CIP (Common Isochronous Packet) header that precedes
   each packet of DV data.

   See the IEC 61883 standard.
*/

struct CIP_header { unsigned char b[8]; };

static inline void fill_cip_header(struct CIP_header *cip,
				   unsigned char source_node_id,
				   unsigned long counter,
				   enum pal_or_ntsc format,
				   unsigned long timestamp)
{
	cip->b[0] = source_node_id;
	cip->b[1] = 0x78; /* packet size in quadlets (480/4) - even for empty packets! */
	cip->b[2] = 0x00;
	cip->b[3] = counter;

	cip->b[4] = 0x80; /* const */

	switch(format) {
	case DV1394_PAL:
		cip->b[5] = 0x80;
		break;
	case DV1394_NTSC:
		cip->b[5] = 0x00;
		break;
	}

	cip->b[6] = timestamp >> 8;
	cip->b[7] = timestamp & 0xFF;
}



/*
   DMA commands used to program the OHCI's DMA engine

   See the Texas Instruments OHCI 1394 chipset documentation.
*/

struct output_more_immediate { __le32 q[8]; };
struct output_more { __le32 q[4]; };
struct output_last { __le32 q[4]; };
struct input_more { __le32 q[4]; };
struct input_last { __le32 q[4]; };

/* outputs */

static inline void fill_output_more_immediate(struct output_more_immediate *omi,
					      unsigned char tag,
					      unsigned char channel,
					      unsigned char sync_tag,
					      unsigned int  payload_size)
{
	omi->q[0] = cpu_to_le32(0x02000000 | 8); /* OUTPUT_MORE_IMMEDIATE; 8 is the size of the IT header */
	omi->q[1] = cpu_to_le32(0);
	omi->q[2] = cpu_to_le32(0);
	omi->q[3] = cpu_to_le32(0);

	/* IT packet header */
	omi->q[4] = cpu_to_le32(  (0x0 << 16)  /* IEEE1394_SPEED_100 */
				  | (tag << 14)
				  | (channel << 8)
				  | (TCODE_ISO_DATA << 4)
				  | (sync_tag) );

	/* reserved field; mimic behavior of my Sony DSR-40 */
	omi->q[5] = cpu_to_le32((payload_size << 16) | (0x7F << 8) | 0xA0);

	omi->q[6] = cpu_to_le32(0);
	omi->q[7] = cpu_to_le32(0);
}

static inline void fill_output_more(struct output_more *om,
				    unsigned int data_size,
				    unsigned long data_phys_addr)
{
	om->q[0] = cpu_to_le32(data_size);
	om->q[1] = cpu_to_le32(data_phys_addr);
	om->q[2] = cpu_to_le32(0);
	om->q[3] = cpu_to_le32(0);
}

static inline void fill_output_last(struct output_last *ol,
				    int want_timestamp,
				    int want_interrupt,
				    unsigned int data_size,
				    unsigned long data_phys_addr)
{
	u32 temp = 0;
	temp |= 1 << 28; /* OUTPUT_LAST */

	if (want_timestamp) /* controller will update timestamp at DMA time */
		temp |= 1 << 27;

	if (want_interrupt)
		temp |= 3 << 20;

	temp |= 3 << 18; /* must take branch */
	temp |= data_size;

	ol->q[0] = cpu_to_le32(temp);
	ol->q[1] = cpu_to_le32(data_phys_addr);
	ol->q[2] = cpu_to_le32(0);
	ol->q[3] = cpu_to_le32(0);
}

/* inputs */

static inline void fill_input_more(struct input_more *im,
				   int want_interrupt,
				   unsigned int data_size,
				   unsigned long data_phys_addr)
{
	u32 temp =  2 << 28; /* INPUT_MORE */
	temp |= 8 << 24; /* s = 1, update xferStatus and resCount */
	if (want_interrupt)
		temp |= 0 << 20; /* interrupts, i=0 in packet-per-buffer mode */
	temp |= 0x0 << 16; /* disable branch to address for packet-per-buffer mode */
	                       /* disable wait on sync field, not used in DV :-( */
       	temp |= data_size;

	im->q[0] = cpu_to_le32(temp);
	im->q[1] = cpu_to_le32(data_phys_addr);
	im->q[2] = cpu_to_le32(0); /* branchAddress and Z not use in packet-per-buffer mode */
	im->q[3] = cpu_to_le32(0); /* xferStatus & resCount, resCount must be initialize to data_size */
}
 
static inline void fill_input_last(struct input_last *il,
				    int want_interrupt,
				    unsigned int data_size,
				    unsigned long data_phys_addr)
{
	u32 temp =  3 << 28; /* INPUT_LAST */
	temp |= 8 << 24; /* s = 1, update xferStatus and resCount */
	if (want_interrupt)
		temp |= 3 << 20; /* enable interrupts */
	temp |= 0xC << 16; /* enable branch to address */
	                       /* disable wait on sync field, not used in DV :-( */
	temp |= data_size;

	il->q[0] = cpu_to_le32(temp);
	il->q[1] = cpu_to_le32(data_phys_addr);
	il->q[2] = cpu_to_le32(1); /* branchAddress (filled in later) and Z = 1 descriptor in next block */
	il->q[3] = cpu_to_le32(data_size); /* xferStatus & resCount, resCount must be initialize to data_size */
}



/*
   A "DMA descriptor block" consists of several contiguous DMA commands.
   struct DMA_descriptor_block encapsulates all of the commands necessary
   to send one packet of DV data.

   There are three different types of these blocks:

        1) command to send an empty packet (CIP header only, no DV data):

	    OUTPUT_MORE-Immediate <-- contains the iso header in-line
	    OUTPUT_LAST           <-- points to the CIP header

	2) command to send a full packet when the DV data payload does NOT
	   cross a page boundary:

	    OUTPUT_MORE-Immediate <-- contains the iso header in-line
	    OUTPUT_MORE           <-- points to the CIP header
	    OUTPUT_LAST           <-- points to entire DV data payload

	3) command to send a full packet when the DV payload DOES cross
	   a page boundary:

	    OUTPUT_MORE-Immediate <-- contains the iso header in-line
	    OUTPUT_MORE           <-- points to the CIP header
	    OUTPUT_MORE           <-- points to first part of DV data payload
	    OUTPUT_LAST           <-- points to second part of DV data payload

   This struct describes all three block types using unions.

   !!! It is vital that an even number of these descriptor blocks fit on one
   page of memory, since a block cannot cross a page boundary !!!

 */

struct DMA_descriptor_block {

	union {
		struct {
			/*  iso header, common to all output block types */
			struct output_more_immediate omi;

			union {
				/* empty packet */
				struct {
					struct output_last ol;  /* CIP header */
				} empty;

				/* full packet */
				struct {
					struct output_more om;  /* CIP header */

					union {
				               /* payload does not cross page boundary */
						struct {
							struct output_last ol;  /* data payload */
						} nocross;

				               /* payload crosses page boundary */
						struct<