+++ /dev/null
-/*
- * 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 {
- struct output_more om; /* data payload */
- struct output_last ol; /* data payload */
- } cross;
- } u;
-
- } full;
- } u;
- } out;
-
- struct {
- struct input_last il;
- } in;
-
- } u;
-
- /* ensure that PAGE_SIZE % sizeof(struct DMA_descriptor_block) == 0
- by padding out to 128 bytes */
- u32 __pad__[12];
-};
-
-
-/* struct frame contains all data associated with one frame in the
- ringbuffer these are allocated when the DMA context is initialized
- do_dv1394_init(). They are re-used after the card finishes
- transmitting the frame. */
-
-struct video_card; /* forward declaration */
-
-struct frame {
-
- /* points to the struct video_card that owns this frame */
- struct video_card *video;
-
- /* index of this frame in video_card->frames[] */
- unsigned int frame_num;
-
- /* FRAME_CLEAR - DMA program not set up, waiting for data
- FRAME_READY - DMA program written, ready to transmit
-
- Changes to these should be locked against the interrupt
- */
- enum {
- FRAME_CLEAR = 0,
- FRAME_READY
- } state;
-
- /* whether this frame has been DMA'ed already; used only from
- the IRQ handler to determine whether the frame can be reset */
- int done;
-
-
- /* kernel virtual pointer to the start of this frame's data in
- the user ringbuffer. Use only for CPU access; to get the DMA
- bus address you must go through the video->user_dma mapping */
- unsigned long data;
-
- /* Max # of packets per frame */
-#define MAX_PACKETS 500
-
-
- /* a PAGE_SIZE memory pool for allocating CIP headers
- !header_pool must be aligned to PAGE_SIZE! */
- struct CIP_header *header_pool;
- dma_addr_t header_pool_dma;
-
-
- /* a physically contiguous memory pool for allocating DMA
- descriptor blocks; usually around 64KB in size
- !descriptor_pool must be aligned to PAGE_SIZE! */
- struct DMA_descriptor_block *descriptor_pool;
- dma_addr_t descriptor_pool_dma;
- unsigned long descriptor_pool_size;
-
-
- /* # of packets allocated for this frame */
- unsigned int n_packets;
-
-
- /* below are several pointers (kernel virtual addresses, not
- DMA bus addresses) to parts of the DMA program. These are
- set each time the DMA program is written in
- frame_prepare(). They are used later on, e.g. from the
- interrupt handler, to check the status of the frame */
-
- /* points to status/timestamp field of first DMA packet */
- /* (we'll check it later to monitor timestamp accuracy) */
- __le32 *frame_begin_timestamp;
-
- /* the timestamp we assigned to the first packet in the frame */
- u32 assigned_timestamp;
-
- /* pointer to the first packet's CIP header (where the timestamp goes) */
- struct CIP_header *cip_syt1;
-
- /* pointer to the second packet's CIP header
- (only set if the first packet was empty) */
- struct CIP_header *cip_syt2;
-
- /* in order to figure out what caused an interrupt,
- store pointers to the status fields of the two packets
- that can cause interrupts. We'll check these from the
- interrupt handler.
- */
- __le32 *mid_frame_timestamp;
- __le32 *frame_end_timestamp;
-
- /* branch address field of final packet. This is effectively
- the "tail" in the chain of DMA descriptor blocks.
- We will fill it with the address of the first DMA descriptor
- block in the subsequent frame, once it is ready.
- */
- __le32 *frame_end_branch;
-
- /* the number of descriptors in the first descriptor block
- of the frame. Needed to start DMA */
- int first_n_descriptors;
-};
-
-
-struct packet {
- __le16 timestamp;
- u16 invalid;
- u16 iso_header;
- __le16 data_length;
- u32 cip_h1;
- u32 cip_h2;
- unsigned char data[480];
- unsigned char padding[16]; /* force struct size =512 for page alignment */
-};
-
-
-/* allocate/free a frame */
-static struct frame* frame_new(unsigned int frame_num, struct video_card *video);
-static void frame_delete(struct frame *f);
-
-/* reset f so that it can be used again */
-static void frame_reset(struct frame *f);
-
-/* struct video_card contains all data associated with one instance
- of the dv1394 driver
-*/
-enum modes {
- MODE_RECEIVE,
- MODE_TRANSMIT
-};
-
-struct video_card {
-
- /* ohci card to which this instance corresponds */
- struct ti_ohci *ohci;
-
- /* OHCI card id; the link between the VFS inode and a specific video_card
- (essentially the device minor number) */
- int id;
-
- /* entry in dv1394_cards */
- struct list_head list;
-
- /* OHCI card IT DMA context number, -1 if not in use */
- int ohci_it_ctx;
- struct ohci1394_iso_tasklet it_tasklet;
-
- /* register offsets for current IT DMA context, 0 if not in use */
- u32 ohci_IsoXmitContextControlSet;
- u32 ohci_IsoXmitContextControlClear;
- u32 ohci_IsoXmitCommandPtr;
-
- /* OHCI card IR DMA context number, -1 if not in use */
- struct ohci1394_iso_tasklet ir_tasklet;
- int ohci_ir_ctx;
-
- /* register offsets for current IR DMA context, 0 if not in use */
- u32 ohci_IsoRcvContextControlSet;
- u32 ohci_IsoRcvContextControlClear;
- u32 ohci_IsoRcvCommandPtr;
- u32 ohci_IsoRcvContextMatch;
-
-
- /* CONCURRENCY CONTROL */
-
- /* there are THREE levels of locking associated with video_card. */
-
- /*
- 1) the 'open' flag - this prevents more than one process from
- opening the device. (the driver currently assumes only one opener).
- This is a regular int, but use test_and_set_bit() (on bit zero)
- for atomicity.
- */
- unsigned long open;
-
- /*
- 2) the spinlock - this provides mutual exclusion between the interrupt
- handler and process-context operations. Generally you must take the
- spinlock under the following conditions:
- 1) DMA (and hence the interrupt handler) may be running
- AND
- 2) you need to operate on the video_card, especially active_frame
-
- It is OK to play with video_card without taking the spinlock if
- you are certain that DMA is not running. Even if DMA is running,
- it is OK to *read* active_frame with the lock, then drop it
- immediately. This is safe because the interrupt handler will never
- advance active_frame onto a frame that is not READY (and the spinlock
- must be held while marking a frame READY).
-
- spinlock is also used to protect ohci_it_ctx and ohci_ir_ctx,
- which can be accessed from both process and interrupt context
- */
- spinlock_t spinlock;
-
- /* flag to prevent spurious interrupts (which OHCI seems to
- generate a lot :) from accessing the struct */
- int dma_running;
-
- /*
- 3) the sleeping mutex 'mtx' - this is used from process context only,
- to serialize various operations on the video_card. Even though only one
- open() is allowed, we still need to prevent multiple threads of execution
- from entering calls like read, write, ioctl, etc.
-
- I honestly can't think of a good reason to use dv1394 from several threads
- at once, but we need to serialize anyway to prevent oopses =).
-
- NOTE: if you need both spinlock and mtx, take mtx first to avoid deadlock!
- */
- struct mutex mtx;
-
- /* people waiting for buffer space, please form a line here... */
- wait_queue_head_t waitq;
-
- /* support asynchronous I/O signals (SIGIO) */
- struct fasync_struct *fasync;
-
- /* the large, non-contiguous (rvmalloc()) ringbuffer for DV
- data, exposed to user-space via mmap() */
- unsigned long dv_buf_size;
- struct dma_region dv_buf;
-
- /* next byte in the ringbuffer that a write() call will fill */
- size_t write_off;
-
- struct frame *frames[DV1394_MAX_FRAMES];
-
- /* n_frames also serves as an indicator that this struct video_card is
- initialized and ready to run DMA buffers */
-
- int n_frames;
-
- /* this is the frame that is currently "owned" by the OHCI DMA controller
- (set to -1 iff DMA is not running)
-
- ! must lock against the interrupt handler when accessing it !
-
- RULES:
-
- Only the interrupt handler may change active_frame if DMA
- is running; if not, process may change it
-
- If the next frame is READY, the interrupt handler will advance
- active_frame when the current frame is finished.
-
- If the next frame is CLEAR, the interrupt handler will re-transmit
- the current frame, and the dropped_frames counter will be incremented.
-
- The interrupt handler will NEVER advance active_frame to a
- frame that is not READY.
- */
- int active_frame;
- int first_run;
-
- /* the same locking rules apply to these three fields also: */
-
- /* altered ONLY from process context. Must check first_clear_frame->state;
- if it's READY, that means the ringbuffer is full with READY frames;
- if it's CLEAR, that means one or more ringbuffer frames are CLEAR */
- unsigned int first_clear_frame;
-
- /* altered both by process and interrupt */
- unsigned int n_clear_frames;
-
- /* only altered by the interrupt */
- unsigned int dropped_frames;
-
-
-
- /* the CIP accumulator and continuity counter are properties
- of the DMA stream as a whole (not a single frame), so they
- are stored here in the video_card */
-
- unsigned long cip_accum;
- unsigned long cip_n, cip_d;
- unsigned int syt_offset;
- unsigned int continuity_counter;
-
- enum pal_or_ntsc pal_or_ntsc;
-
- /* redundant, but simplifies the code somewhat */
- unsigned int frame_size; /* in bytes */
-
- /* the isochronous channel to use, -1 if video card is inactive */
- int channel;
-
-
- /* physically contiguous packet ringbuffer for receive */
- struct dma_region packet_buf;
- unsigned long packet_buf_size;
-
- unsigned int current_packet;
- int first_frame; /* received first start frame marker? */
- enum modes mode;
-};
-
-/*
- if the video_card is not initialized, then the ONLY fields that are valid are:
- ohci
- open
- n_frames
-*/
-
-static inline int video_card_initialized(struct video_card *v)
-{
- return v->n_frames > 0;
-}
-
-static int do_dv1394_init(struct video_card *video, struct dv1394_init *init);
-static int do_dv1394_init_default(struct video_card *video);
-static void do_dv1394_shutdown(struct video_card *video, int free_user_buf);
-
-
-/* NTSC empty packet rate accurate to within 0.01%,
- calibrated against a Sony DSR-40 DVCAM deck */
-
-#define CIP_N_NTSC 68000000
-#define CIP_D_NTSC 1068000000
-
-#define CIP_N_PAL 1
-#define CIP_D_PAL 16
-
-#endif /* _DV_1394_PRIVATE_H */
-
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