+++ /dev/null
-/*
- * dv1394.c - 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.c - video driver for OHCI 1394 boards
- * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
- *
- * 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.
- */
-
-/*
- OVERVIEW
-
- I designed dv1394 as a "pipe" that you can use to shoot DV onto a
- FireWire bus. In transmission mode, dv1394 does the following:
-
- 1. accepts contiguous frames of DV data from user-space, via write()
- or mmap() (see dv1394.h for the complete API)
- 2. wraps IEC 61883 packets around the DV data, inserting
- empty synchronization packets as necessary
- 3. assigns accurate SYT timestamps to the outgoing packets
- 4. shoots them out using the OHCI card's IT DMA engine
-
- Thanks to Dan Dennedy, we now have a receive mode that does the following:
-
- 1. accepts raw IEC 61883 packets from the OHCI card
- 2. re-assembles the DV data payloads into contiguous frames,
- discarding empty packets
- 3. sends the DV data to user-space via read() or mmap()
-*/
-
-/*
- TODO:
-
- - tunable frame-drop behavior: either loop last frame, or halt transmission
-
- - use a scatter/gather buffer for DMA programs (f->descriptor_pool)
- so that we don't rely on allocating 64KB of contiguous kernel memory
- via pci_alloc_consistent()
-
- DONE:
- - during reception, better handling of dropped frames and continuity errors
- - during reception, prevent DMA from bypassing the irq tasklets
- - reduce irq rate during reception (1/250 packets).
- - add many more internal buffers during reception with scatter/gather dma.
- - add dbc (continuity) checking on receive, increment status.dropped_frames
- if not continuous.
- - restart IT DMA after a bus reset
- - safely obtain and release ISO Tx channels in cooperation with OHCI driver
- - map received DIF blocks to their proper location in DV frame (ensure
- recovery if dropped packet)
- - handle bus resets gracefully (OHCI card seems to take care of this itself(!))
- - do not allow resizing the user_buf once allocated; eliminate nuke_buffer_mappings
- - eliminated #ifdef DV1394_DEBUG_LEVEL by inventing macros debug_printk and irq_printk
- - added wmb() and mb() to places where PCI read/write ordering needs to be enforced
- - set video->id correctly
- - store video_cards in an array indexed by OHCI card ID, rather than a list
- - implement DMA context allocation to cooperate with other users of the OHCI
- - fix all XXX showstoppers
- - disable IR/IT DMA interrupts on shutdown
- - flush pci writes to the card by issuing a read
- - character device dispatching
- - switch over to the new kernel DMA API (pci_map_*()) (* needs testing on platforms with IOMMU!)
- - keep all video_cards in a list (for open() via chardev), set file->private_data = video
- - dv1394_poll should indicate POLLIN when receiving buffers are available
- - add proc fs interface to set cip_n, cip_d, syt_offset, and video signal
- - expose xmit and recv as separate devices (not exclusive)
- - expose NTSC and PAL as separate devices (can be overridden)
-
-*/
-
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/wait.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/mutex.h>
-#include <linux/bitops.h>
-#include <asm/byteorder.h>
-#include <asm/atomic.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <linux/delay.h>
-#include <asm/pgtable.h>
-#include <asm/page.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/vmalloc.h>
-#include <linux/string.h>
-#include <linux/compat.h>
-#include <linux/cdev.h>
-
-#include "dv1394.h"
-#include "dv1394-private.h"
-#include "highlevel.h"
-#include "hosts.h"
-#include "ieee1394.h"
-#include "ieee1394_core.h"
-#include "ieee1394_hotplug.h"
-#include "ieee1394_types.h"
-#include "nodemgr.h"
-#include "ohci1394.h"
-
-/* DEBUG LEVELS:
- 0 - no debugging messages
- 1 - some debugging messages, but none during DMA frame transmission
- 2 - lots of messages, including during DMA frame transmission
- (will cause underflows if your machine is too slow!)
-*/
-
-#define DV1394_DEBUG_LEVEL 0
-
-/* for debugging use ONLY: allow more than one open() of the device */
-/* #define DV1394_ALLOW_MORE_THAN_ONE_OPEN 1 */
-
-#if DV1394_DEBUG_LEVEL >= 2
-#define irq_printk( args... ) printk( args )
-#else
-#define irq_printk( args... ) do {} while (0)
-#endif
-
-#if DV1394_DEBUG_LEVEL >= 1
-#define debug_printk( args... ) printk( args)
-#else
-#define debug_printk( args... ) do {} while (0)
-#endif
-
-/* issue a dummy PCI read to force the preceding write
- to be posted to the PCI bus immediately */
-
-static inline void flush_pci_write(struct ti_ohci *ohci)
-{
- mb();
- reg_read(ohci, OHCI1394_IsochronousCycleTimer);
-}
-
-static void it_tasklet_func(unsigned long data);
-static void ir_tasklet_func(unsigned long data);
-
-#ifdef CONFIG_COMPAT
-static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg);
-#endif
-
-/* GLOBAL DATA */
-
-/* list of all video_cards */
-static LIST_HEAD(dv1394_cards);
-static DEFINE_SPINLOCK(dv1394_cards_lock);
-
-/* translate from a struct file* to the corresponding struct video_card* */
-
-static inline struct video_card* file_to_video_card(struct file *file)
-{
- return file->private_data;
-}
-
-/*** FRAME METHODS *********************************************************/
-
-static void frame_reset(struct frame *f)
-{
- f->state = FRAME_CLEAR;
- f->done = 0;
- f->n_packets = 0;
- f->frame_begin_timestamp = NULL;
- f->assigned_timestamp = 0;
- f->cip_syt1 = NULL;
- f->cip_syt2 = NULL;
- f->mid_frame_timestamp = NULL;
- f->frame_end_timestamp = NULL;
- f->frame_end_branch = NULL;
-}
-
-static struct frame* frame_new(unsigned int frame_num, struct video_card *video)
-{
- struct frame *f = kmalloc(sizeof(*f), GFP_KERNEL);
- if (!f)
- return NULL;
-
- f->video = video;
- f->frame_num = frame_num;
-
- f->header_pool = pci_alloc_consistent(f->video->ohci->dev, PAGE_SIZE, &f->header_pool_dma);
- if (!f->header_pool) {
- printk(KERN_ERR "dv1394: failed to allocate CIP header pool\n");
- kfree(f);
- return NULL;
- }
-
- debug_printk("dv1394: frame_new: allocated CIP header pool at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
- (unsigned long) f->header_pool, (unsigned long) f->header_pool_dma, PAGE_SIZE);
-
- f->descriptor_pool_size = MAX_PACKETS * sizeof(struct DMA_descriptor_block);
- /* make it an even # of pages */
- f->descriptor_pool_size += PAGE_SIZE - (f->descriptor_pool_size%PAGE_SIZE);
-
- f->descriptor_pool = pci_alloc_consistent(f->video->ohci->dev,
- f->descriptor_pool_size,
- &f->descriptor_pool_dma);
- if (!f->descriptor_pool) {
- pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
- kfree(f);
- return NULL;
- }
-
- debug_printk("dv1394: frame_new: allocated DMA program memory at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
- (unsigned long) f->descriptor_pool, (unsigned long) f->descriptor_pool_dma, f->descriptor_pool_size);
-
- f->data = 0;
- frame_reset(f);
-
- return f;
-}
-
-static void frame_delete(struct frame *f)
-{
- pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
- pci_free_consistent(f->video->ohci->dev, f->descriptor_pool_size, f->descriptor_pool, f->descriptor_pool_dma);
- kfree(f);
-}
-
-
-
-
-/*
- frame_prepare() - build the DMA program for transmitting
-
- Frame_prepare() must be called OUTSIDE the video->spinlock.
- However, frame_prepare() must still be serialized, so
- it should be called WITH the video->mtx taken.
- */
-
-static void frame_prepare(struct video_card *video, unsigned int this_frame)
-{
- struct frame *f = video->frames[this_frame];
- int last_frame;
-
- struct DMA_descriptor_block *block;
- dma_addr_t block_dma;
- struct CIP_header *cip;
- dma_addr_t cip_dma;
-
- unsigned int n_descriptors, full_packets, packets_per_frame, payload_size;
-
- /* these flags denote packets that need special attention */
- int empty_packet, first_packet, last_packet, mid_packet;
-
- __le32 *branch_address, *last_branch_address = NULL;
- unsigned long data_p;
- int first_packet_empty = 0;
- u32 cycleTimer, ct_sec, ct_cyc, ct_off;
- unsigned long irq_flags;
-
- irq_printk("frame_prepare( %d ) ---------------------\n", this_frame);
-
- full_packets = 0;
-
-
-
- if (video->pal_or_ntsc == DV1394_PAL)
- packets_per_frame = DV1394_PAL_PACKETS_PER_FRAME;
- else
- packets_per_frame = DV1394_NTSC_PACKETS_PER_FRAME;
-
- while ( full_packets < packets_per_frame ) {
- empty_packet = first_packet = last_packet = mid_packet = 0;
-
- data_p = f->data + full_packets * 480;
-
- /************************************************/
- /* allocate a descriptor block and a CIP header */
- /************************************************/
-
- /* note: these should NOT cross a page boundary (DMA restriction) */
-
- if (f->n_packets >= MAX_PACKETS) {
- printk(KERN_ERR "dv1394: FATAL ERROR: max packet count exceeded\n");
- return;
- }
-
- /* the block surely won't cross a page boundary,
- since an even number of descriptor_blocks fit on a page */
- block = &(f->descriptor_pool[f->n_packets]);
-
- /* DMA address of the block = offset of block relative
- to the kernel base address of the descriptor pool
- + DMA base address of the descriptor pool */
- block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
-
-
- /* the whole CIP pool fits on one page, so no worries about boundaries */
- if ( ((unsigned long) &(f->header_pool[f->n_packets]) - (unsigned long) f->header_pool)
- > PAGE_SIZE) {
- printk(KERN_ERR "dv1394: FATAL ERROR: no room to allocate CIP header\n");
- return;
- }
-
- cip = &(f->header_pool[f->n_packets]);
-
- /* DMA address of the CIP header = offset of cip
- relative to kernel base address of the header pool
- + DMA base address of the header pool */
- cip_dma = (unsigned long) cip % PAGE_SIZE + f->header_pool_dma;
-
- /* is this an empty packet? */
-
- if (video->cip_accum > (video->cip_d - video->cip_n)) {
- empty_packet = 1;
- payload_size = 8;
- video->cip_accum -= (video->cip_d - video->cip_n);
- } else {
- payload_size = 488;
- video->cip_accum += video->cip_n;
- }
-
- /* there are three important packets each frame:
-
- the first packet in the frame - we ask the card to record the timestamp when
- this packet is actually sent, so we can monitor
- how accurate our timestamps are. Also, the first
- packet serves as a semaphore to let us know that
- it's OK to free the *previous* frame's DMA buffer
-
- the last packet in the frame - this packet is used to detect buffer underflows.
- if this is the last ready frame, the last DMA block
- will have a branch back to the beginning of the frame
- (so that the card will re-send the frame on underflow).
- if this branch gets taken, we know that at least one
- frame has been dropped. When the next frame is ready,
- the branch is pointed to its first packet, and the
- semaphore is disabled.
-
- a "mid" packet slightly before the end of the frame - this packet should trigger
- an interrupt so we can go and assign a timestamp to the first packet
- in the next frame. We don't use the very last packet in the frame
- for this purpose, because that would leave very little time to set
- the timestamp before DMA starts on the next frame.
- */
-
- if (f->n_packets == 0) {
- first_packet = 1;
- } else if ( full_packets == (packets_per_frame-1) ) {
- last_packet = 1;
- } else if (f->n_packets == packets_per_frame) {
- mid_packet = 1;
- }
-
-
- /********************/
- /* setup CIP header */
- /********************/
-
- /* the timestamp will be written later from the
- mid-frame interrupt handler. For now we just
- store the address of the CIP header(s) that
- need a timestamp. */
-
- /* first packet in the frame needs a timestamp */
- if (first_packet) {
- f->cip_syt1 = cip;
- if (empty_packet)
- first_packet_empty = 1;
-
- } else if (first_packet_empty && (f->n_packets == 1) ) {
- /* if the first packet was empty, the second
- packet's CIP header also needs a timestamp */
- f->cip_syt2 = cip;
- }
-
- fill_cip_header(cip,
- /* the node ID number of the OHCI card */
- reg_read(video->ohci, OHCI1394_NodeID) & 0x3F,
- video->continuity_counter,
- video->pal_or_ntsc,
- 0xFFFF /* the timestamp is filled in later */);
-
- /* advance counter, only for full packets */
- if ( ! empty_packet )
- video->continuity_counter++;
-
- /******************************/
- /* setup DMA descriptor block */
- /******************************/
-
- /* first descriptor - OUTPUT_MORE_IMMEDIATE, for the controller's IT header */
- fill_output_more_immediate( &(block->u.out.omi), 1, video->channel, 0, payload_size);
-
- if (empty_packet) {
- /* second descriptor - OUTPUT_LAST for CIP header */
- fill_output_last( &(block->u.out.u.empty.ol),
-
- /* want completion status on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- /* want interrupts on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- sizeof(struct CIP_header), /* data size */
- cip_dma);
-
- if (first_packet)
- f->frame_begin_timestamp = &(block->u.out.u.empty.ol.q[3]);
- else if (mid_packet)
- f->mid_frame_timestamp = &(block->u.out.u.empty.ol.q[3]);
- else if (last_packet) {
- f->frame_end_timestamp = &(block->u.out.u.empty.ol.q[3]);
- f->frame_end_branch = &(block->u.out.u.empty.ol.q[2]);
- }
-
- branch_address = &(block->u.out.u.empty.ol.q[2]);
- n_descriptors = 3;
- if (first_packet)
- f->first_n_descriptors = n_descriptors;
-
- } else { /* full packet */
-
- /* second descriptor - OUTPUT_MORE for CIP header */
- fill_output_more( &(block->u.out.u.full.om),
- sizeof(struct CIP_header), /* data size */
- cip_dma);
-
-
- /* third (and possibly fourth) descriptor - for DV data */
- /* the 480-byte payload can cross a page boundary; if so,
- we need to split it into two DMA descriptors */
-
- /* does the 480-byte data payload cross a page boundary? */
- if ( (PAGE_SIZE- ((unsigned long)data_p % PAGE_SIZE) ) < 480 ) {
-
- /* page boundary crossed */
-
- fill_output_more( &(block->u.out.u.full.u.cross.om),
- /* data size - how much of data_p fits on the first page */
- PAGE_SIZE - (data_p % PAGE_SIZE),
-
- /* DMA address of data_p */
- dma_region_offset_to_bus(&video->dv_buf,
- data_p - (unsigned long) video->dv_buf.kvirt));
-
- fill_output_last( &(block->u.out.u.full.u.cross.ol),
-
- /* want completion status on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- /* want interrupt on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- /* data size - remaining portion of data_p */
- 480 - (PAGE_SIZE - (data_p % PAGE_SIZE)),
-
- /* DMA address of data_p + PAGE_SIZE - (data_p % PAGE_SIZE) */
- dma_region_offset_to_bus(&video->dv_buf,
- data_p + PAGE_SIZE - (data_p % PAGE_SIZE) - (unsigned long) video->dv_buf.kvirt));
-
- if (first_packet)
- f->frame_begin_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
- else if (mid_packet)
- f->mid_frame_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
- else if (last_packet) {
- f->frame_end_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
- f->frame_end_branch = &(block->u.out.u.full.u.cross.ol.q[2]);
- }
-
- branch_address = &(block->u.out.u.full.u.cross.ol.q[2]);
-
- n_descriptors = 5;
- if (first_packet)
- f->first_n_descriptors = n_descriptors;
-
- full_packets++;
-
- } else {
- /* fits on one page */
-
- fill_output_last( &(block->u.out.u.full.u.nocross.ol),
-
- /* want completion status on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- /* want interrupt on all interesting packets */
- (first_packet || mid_packet || last_packet) ? 1 : 0,
-
- 480, /* data size (480 bytes of DV data) */
-
-
- /* DMA address of data_p */
- dma_region_offset_to_bus(&video->dv_buf,
- data_p - (unsigned long) video->dv_buf.kvirt));
-
- if (first_packet)
- f->frame_begin_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
- else if (mid_packet)
- f->mid_frame_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
- else if (last_packet) {
- f->frame_end_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
- f->frame_end_branch = &(block->u.out.u.full.u.nocross.ol.q[2]);
- }
-
- branch_address = &(block->u.out.u.full.u.nocross.ol.q[2]);
-
- n_descriptors = 4;
- if (first_packet)
- f->first_n_descriptors = n_descriptors;
-
- full_packets++;
- }
- }
-
- /* link this descriptor block into the DMA program by filling in
- the branch address of the previous block */
-
- /* note: we are not linked into the active DMA chain yet */
-
- if (last_branch_address) {
- *(last_branch_address) = cpu_to_le32(block_dma | n_descriptors);
- }
-
- last_branch_address = branch_address;
-
-
- f->n_packets++;
-
- }
-
- /* when we first assemble a new frame, set the final branch
- to loop back up to the top */
- *(f->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
-
- /* make the latest version of this frame visible to the PCI card */
- dma_region_sync_for_device(&video->dv_buf, f->data - (unsigned long) video->dv_buf.kvirt, video->frame_size);
-
- /* lock against DMA interrupt */
- spin_lock_irqsave(&video->spinlock, irq_flags);
-
- f->state = FRAME_READY;
-
- video->n_clear_frames--;
-
- last_frame = video->first_clear_frame - 1;
- if (last_frame == -1)
- last_frame = video->n_frames-1;
-
- video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
-
- irq_printk(" frame %d prepared, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n last=%d\n",
- this_frame, video->active_frame, video->n_clear_frames, video->first_clear_frame, last_frame);
-
- irq_printk(" begin_ts %08lx mid_ts %08lx end_ts %08lx end_br %08lx\n",
- (unsigned long) f->frame_begin_timestamp,
- (unsigned long) f->mid_frame_timestamp,
- (unsigned long) f->frame_end_timestamp,
- (unsigned long) f->frame_end_branch);
-
- if (video->active_frame != -1) {
-
- /* if DMA is already active, we are almost done */
- /* just link us onto the active DMA chain */
- if (video->frames[last_frame]->frame_end_branch) {
- u32 temp;
-
- /* point the previous frame's tail to this frame's head */
- *(video->frames[last_frame]->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
-
- /* this write MUST precede the next one, or we could silently drop frames */
- wmb();
-
- /* disable the want_status semaphore on the last packet */
- temp = le32_to_cpu(*(video->frames[last_frame]->frame_end_branch - 2));
- temp &= 0xF7CFFFFF;
- *(video->frames[last_frame]->frame_end_branch - 2) = cpu_to_le32(temp);
-
- /* flush these writes to memory ASAP */
- flush_pci_write(video->ohci);
-
- /* NOTE:
- ideally the writes should be "atomic": if
- the OHCI card reads the want_status flag in
- between them, we'll falsely report a
- dropped frame. Hopefully this window is too
- small to really matter, and the consequence
- is rather harmless. */
-
-
- irq_printk(" new frame %d linked onto DMA chain\n", this_frame);
-
- } else {
- printk(KERN_ERR "dv1394: last frame not ready???\n");
- }
-
- } else {
-
- u32 transmit_sec, transmit_cyc;
- u32 ts_cyc;
-
- /* DMA is stopped, so this is the very first frame */
- video->active_frame = this_frame;
-
- /* set CommandPtr to address and size of first descriptor block */
- reg_write(video->ohci, video->ohci_IsoXmitCommandPtr,
- video->frames[video->active_frame]->descriptor_pool_dma |
- f->first_n_descriptors);
-
- /* assign a timestamp based on the current cycle time...
- We'll tell the card to begin DMA 100 cycles from now,
- and assign a timestamp 103 cycles from now */
-
- cycleTimer = reg_read(video->ohci, OHCI1394_IsochronousCycleTimer);
-
- ct_sec = cycleTimer >> 25;
- ct_cyc = (cycleTimer >> 12) & 0x1FFF;
- ct_off = cycleTimer & 0xFFF;
-
- transmit_sec = ct_sec;
- transmit_cyc = ct_cyc + 100;
-
- transmit_sec += transmit_cyc/8000;
- transmit_cyc %= 8000;
-
- ts_cyc = transmit_cyc + 3;
- ts_cyc %= 8000;
-
- f->assigned_timestamp = (ts_cyc&0xF) << 12;
-
- /* now actually write the timestamp into the appropriate CIP headers */
- if (f->cip_syt1) {
- f->cip_syt1->b[6] = f->assigned_timestamp >> 8;
- f->cip_syt1->b[7] = f->assigned_timestamp & 0xFF;
- }
- if (f->cip_syt2) {
- f->cip_syt2->b[6] = f->assigned_timestamp >> 8;
- f->cip_syt2->b[7] = f->assigned_timestamp & 0xFF;
- }
-
- /* --- start DMA --- */
-
- /* clear all bits in ContextControl register */
-
- reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, 0xFFFFFFFF);
- wmb();
-
- /* the OHCI card has the ability to start ISO transmission on a
- particular cycle (start-on-cycle). This way we can ensure that
- the first DV frame will have an accurate timestamp.
-
- However, start-on-cycle only appears to work if the OHCI card
- is cycle master! Since the consequences of messing up the first
- timestamp are minimal*, just disable start-on-cycle for now.
-
- * my DV deck drops the first few frames before it "locks in;"
- so the first frame having an incorrect timestamp is inconsequential.
- */
-
-#if 0
- reg_write(video->ohci, video->ohci_IsoXmitContextControlSet,
- (1 << 31) /* enable start-on-cycle */
- | ( (transmit_sec & 0x3) << 29)
- | (transmit_cyc << 16));
- wmb();
-#endif
-
- video->dma_running = 1;
-
- /* set the 'run' bit */
- reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, 0x8000);
- flush_pci_write(video->ohci);
-
- /* --- DMA should be running now --- */
-
- debug_printk(" Cycle = %4u ContextControl = %08x CmdPtr = %08x\n",
- (reg_read(video->ohci, OHCI1394_IsochronousCycleTimer) >> 12) & 0x1FFF,
- reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
- reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
-
- debug_printk(" DMA start - current cycle %4u, transmit cycle %4u (%2u), assigning ts cycle %2u\n",
- ct_cyc, transmit_cyc, transmit_cyc & 0xF, ts_cyc & 0xF);
-
-#if DV1394_DEBUG_LEVEL >= 2
- {
- /* check if DMA is really running */
- int i = 0;
- while (i < 20) {
- mb();
- mdelay(1);
- if (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) {
- printk("DMA ACTIVE after %d msec\n", i);
- break;
- }
- i++;
- }
-
- printk("set = %08x, cmdPtr = %08x\n",
- reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
- reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
- );
-
- if ( ! (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
- printk("DMA did NOT go active after 20ms, event = %x\n",
- reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & 0x1F);
- } else
- printk("DMA is RUNNING!\n");
- }
-#endif
-
- }
-
-
- spin_unlock_irqrestore(&video->spinlock, irq_flags);
-}
-
-
-
-/*** RECEIVE FUNCTIONS *****************************************************/
-
-/*
- frame method put_packet
-
- map and copy the packet data to its location in the frame
- based upon DIF section and sequence
-*/
-
-static void inline
-frame_put_packet (struct frame *f, struct packet *p)
-{
- int section_type = p->data[0] >> 5; /* section type is in bits 5 - 7 */
- int dif_sequence = p->data[1] >> 4; /* dif sequence number is in bits 4 - 7 */
- int dif_block = p->data[2];
-
- /* sanity check */
- if (dif_sequence > 11 || dif_block > 149) return;
-
- switch (section_type) {
- case 0: /* 1 Header block */
- memcpy( (void *) f->data + dif_sequence * 150 * 80, p->data, 480);
- break;
-
- case 1: /* 2 Subcode blocks */
- memcpy( (void *) f->data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p->data, 480);
- break;
-
- case 2: /* 3 VAUX blocks */
- memcpy( (void *) f->data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p->data, 480);
- break;
-
- case 3: /* 9 Audio blocks interleaved with video */
- memcpy( (void *) f->data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p->data, 480);
- break;
-
- case 4: /* 135 Video blocks interleaved with audio */
- memcpy( (void *) f->data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) + dif_block) * 80, p->data, 480);
- break;
-
- default: /* we can not handle any other data */
- break;
- }
-}
-
-
-static void start_dma_receive(struct video_card *video)
-{
- if (video->first_run == 1) {
- video->first_run = 0;
-
- /* start DMA once all of the frames are READY */
- video->n_clear_frames = 0;
- video->first_clear_frame = -1;
- video->current_packet = 0;
- video->active_frame = 0;
-
- /* reset iso recv control register */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, 0xFFFFFFFF);
- wmb();
-
- /* clear bufferFill, set isochHeader and speed (0=100) */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x40000000);
-
- /* match on all tags, listen on channel */
- reg_write(video->ohci, video->ohci_IsoRcvContextMatch, 0xf0000000 | video->channel);
-
- /* address and first descriptor block + Z=1 */
- reg_write(video->ohci, video->ohci_IsoRcvCommandPtr,
- video->frames[0]->descriptor_pool_dma | 1); /* Z=1 */
- wmb();
-
- video->dma_running = 1;
-
- /* run */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x8000);
- flush_pci_write(video->ohci);
-
- debug_printk("dv1394: DMA started\n");
-
-#if DV1394_DEBUG_LEVEL >= 2
- {
- int i;
-
- for (i = 0; i < 1000; ++i) {
- mdelay(1);
- if (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) {
- printk("DMA ACTIVE after %d msec\n", i);
- break;
- }
- }
- if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
- printk("DEAD, event = %x\n",
- reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
- } else
- printk("RUNNING!\n");
- }
-#endif
- } else if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
- debug_printk("DEAD, event = %x\n",
- reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
-
- /* wake */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
- }
-}
-
-
-/*
- receive_packets() - build the DMA program for receiving
-*/
-
-static void receive_packets(struct video_card *video)
-{
- struct DMA_descriptor_block *block = NULL;
- dma_addr_t block_dma = 0;
- struct packet *data = NULL;
- dma_addr_t data_dma = 0;
- __le32 *last_branch_address = NULL;
- unsigned long irq_flags;
- int want_interrupt = 0;
- struct frame *f = NULL;
- int i, j;
-
- spin_lock_irqsave(&video->spinlock, irq_flags);
-
- for (j = 0; j < video->n_frames; j++) {
-
- /* connect frames */
- if (j > 0 && f != NULL && f->frame_end_branch != NULL)
- *(f->frame_end_branch) = cpu_to_le32(video->frames[j]->descriptor_pool_dma | 1); /* set Z=1 */
-
- f = video->frames[j];
-
- for (i = 0; i < MAX_PACKETS; i++) {
- /* locate a descriptor block and packet from the buffer */
- block = &(f->descriptor_pool[i]);
- block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
-
- data = ((struct packet*)video->packet_buf.kvirt) + f->frame_num * MAX_PACKETS + i;
- data_dma = dma_region_offset_to_bus( &video->packet_buf,
- ((unsigned long) data - (unsigned long) video->packet_buf.kvirt) );
-
- /* setup DMA descriptor block */
- want_interrupt = ((i % (MAX_PACKETS/2)) == 0 || i == (MAX_PACKETS-1));
- fill_input_last( &(block->u.in.il), want_interrupt, 512, data_dma);
-
- /* link descriptors */
- last_branch_address = f->frame_end_branch;
-
- if (last_branch_address != NULL)
- *(last_branch_address) = cpu_to_le32(block_dma | 1); /* set Z=1 */
-
- f->frame_end_branch = &(block->u.in.il.q[2]);
- }
-
- } /* next j */
-
- spin_unlock_irqrestore(&video->spinlock, irq_flags);
-
-}
-
-
-
-/*** MANAGEMENT FUNCTIONS **************************************************/
-
-static int do_dv1394_init(struct video_card *video, struct dv1394_init *init)
-{
- unsigned long flags, new_buf_size;
- int i;
- u64 chan_mask;
- int retval = -EINVAL;
-
- debug_printk("dv1394: initialising %d\n", video->id);
- if (init->api_version != DV1394_API_VERSION)
- return -EINVAL;
-
- /* first sanitize all the parameters */
- if ( (init->n_frames < 2) || (init->n_frames > DV1394_MAX_FRAMES) )
- return -EINVAL;
-
- if ( (init->format != DV1394_NTSC) && (init->format != DV1394_PAL) )
- return -EINVAL;
-
- if ( (init->syt_offset == 0) || (init->syt_offset > 50) )
- /* default SYT offset is 3 cycles */
- init->syt_offset = 3;
-
- if (init->channel > 63)
- init->channel = 63;
-
- chan_mask = (u64)1 << init->channel;
-
- /* calculate what size DMA buffer is needed */
- if (init->format == DV1394_NTSC)
- new_buf_size = DV1394_NTSC_FRAME_SIZE * init->n_frames;
- else
- new_buf_size = DV1394_PAL_FRAME_SIZE * init->n_frames;
-
- /* round up to PAGE_SIZE */
- if (new_buf_size % PAGE_SIZE) new_buf_size += PAGE_SIZE - (new_buf_size % PAGE_SIZE);
-
- /* don't allow the user to allocate the DMA buffer more than once */
- if (video->dv_buf.kvirt && video->dv_buf_size != new_buf_size) {
- printk("dv1394: re-sizing the DMA buffer is not allowed\n");
- return -EINVAL;
- }
-
- /* shutdown the card if it's currently active */
- /* (the card should not be reset if the parameters are screwy) */
-
- do_dv1394_shutdown(video, 0);
-
- /* try to claim the ISO channel */
- spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
- if (video->ohci->ISO_channel_usage & chan_mask) {
- spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
- retval = -EBUSY;
- goto err;
- }
- video->ohci->ISO_channel_usage |= chan_mask;
- spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
-
- video->channel = init->channel;
-
- /* initialize misc. fields of video */
- video->n_frames = init->n_frames;
- video->pal_or_ntsc = init->format;
-
- video->cip_accum = 0;
- video->continuity_counter = 0;
-
- video->active_frame = -1;
- video->first_clear_frame = 0;
- video->n_clear_frames = video->n_frames;
- video->dropped_frames = 0;
-
- video->write_off = 0;
-
- video->first_run = 1;
- video->current_packet = -1;
- video->first_frame = 0;
-
- if (video->pal_or_ntsc == DV1394_NTSC) {
- video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_NTSC;
- video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_NTSC;
- video->frame_size = DV1394_NTSC_FRAME_SIZE;
- } else {
- video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_PAL;
- video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_PAL;
- video->frame_size = DV1394_PAL_FRAME_SIZE;
- }
-
- video->syt_offset = init->syt_offset;
-
- /* find and claim DMA contexts on the OHCI card */
-
- if (video->ohci_it_ctx == -1) {
- ohci1394_init_iso_tasklet(&video->it_tasklet, OHCI_ISO_TRANSMIT,
- it_tasklet_func, (unsigned long) video);
-
- if (ohci1394_register_iso_tasklet(video->ohci, &video->it_tasklet) < 0) {
- printk(KERN_ERR "dv1394: could not find an available IT DMA context\n");
- retval = -EBUSY;
- goto err;
- }
-
- video->ohci_it_ctx = video->it_tasklet.context;
- debug_printk("dv1394: claimed IT DMA context %d\n", video->ohci_it_ctx);
- }
-
- if (video->ohci_ir_ctx == -1) {
- ohci1394_init_iso_tasklet(&video->ir_tasklet, OHCI_ISO_RECEIVE,
- ir_tasklet_func, (unsigned long) video);
-
- if (ohci1394_register_iso_tasklet(video->ohci, &video->ir_tasklet) < 0) {
- printk(KERN_ERR "dv1394: could not find an available IR DMA context\n");
- retval = -EBUSY;
- goto err;
- }
- video->ohci_ir_ctx = video->ir_tasklet.context;
- debug_printk("dv1394: claimed IR DMA context %d\n", video->ohci_ir_ctx);
- }
-
- /* allocate struct frames */
- for (i = 0; i < init->n_frames; i++) {
- video->frames[i] = frame_new(i, video);
-
- if (!video->frames[i]) {
- printk(KERN_ERR "dv1394: Cannot allocate frame structs\n");
- retval = -ENOMEM;
- goto err;
- }
- }
-
- if (!video->dv_buf.kvirt) {
- /* allocate the ringbuffer */
- retval = dma_region_alloc(&video->dv_buf, new_buf_size, video->ohci->dev, PCI_DMA_TODEVICE);
- if (retval)
- goto err;
-
- video->dv_buf_size = new_buf_size;
-
- debug_printk("dv1394: Allocated %d frame buffers, total %u pages (%u DMA pages), %lu bytes\n",
- video->n_frames, video->dv_buf.n_pages,
- video->dv_buf.n_dma_pages, video->dv_buf_size);
- }
-
- /* set up the frame->data pointers */
- for (i = 0; i < video->n_frames; i++)
- video->frames[i]->data = (unsigned long) video->dv_buf.kvirt + i * video->frame_size;
-
- if (!video->packet_buf.kvirt) {
- /* allocate packet buffer */
- video->packet_buf_size = sizeof(struct packet) * video->n_frames * MAX_PACKETS;
- if (video->packet_buf_size % PAGE_SIZE)
- video->packet_buf_size += PAGE_SIZE - (video->packet_buf_size % PAGE_SIZE);
-
- retval = dma_region_alloc(&video->packet_buf, video->packet_buf_size,
- video->ohci->dev, PCI_DMA_FROMDEVICE);
- if (retval)
- goto err;
-
- debug_printk("dv1394: Allocated %d packets in buffer, total %u pages (%u DMA pages), %lu bytes\n",
- video->n_frames*MAX_PACKETS, video->packet_buf.n_pages,
- video->packet_buf.n_dma_pages, video->packet_buf_size);
- }
-
- /* set up register offsets for IT context */
- /* IT DMA context registers are spaced 16 bytes apart */
- video->ohci_IsoXmitContextControlSet = OHCI1394_IsoXmitContextControlSet+16*video->ohci_it_ctx;
- video->ohci_IsoXmitContextControlClear = OHCI1394_IsoXmitContextControlClear+16*video->ohci_it_ctx;
- video->ohci_IsoXmitCommandPtr = OHCI1394_IsoXmitCommandPtr+16*video->ohci_it_ctx;
-
- /* enable interrupts for IT context */
- reg_write(video->ohci, OHCI1394_IsoXmitIntMaskSet, (1 << video->ohci_it_ctx));
- debug_printk("dv1394: interrupts enabled for IT context %d\n", video->ohci_it_ctx);
-
- /* set up register offsets for IR context */
- /* IR DMA context registers are spaced 32 bytes apart */
- video->ohci_IsoRcvContextControlSet = OHCI1394_IsoRcvContextControlSet+32*video->ohci_ir_ctx;
- video->ohci_IsoRcvContextControlClear = OHCI1394_IsoRcvContextControlClear+32*video->ohci_ir_ctx;
- video->ohci_IsoRcvCommandPtr = OHCI1394_IsoRcvCommandPtr+32*video->ohci_ir_ctx;
- video->ohci_IsoRcvContextMatch = OHCI1394_IsoRcvContextMatch+32*video->ohci_ir_ctx;
-
- /* enable interrupts for IR context */
- reg_write(video->ohci, OHCI1394_IsoRecvIntMaskSet, (1 << video->ohci_ir_ctx) );
- debug_printk("dv1394: interrupts enabled for IR context %d\n", video->ohci_ir_ctx);
-
- return 0;
-
-err:
- do_dv1394_shutdown(video, 1);
- return retval;
-}
-
-/* if the user doesn't bother to call ioctl(INIT) before starting
- mmap() or read()/write(), just give him some default values */
-
-static int do_dv1394_init_default(struct video_card *video)
-{
- struct dv1394_init init;
-
- init.api_version = DV1394_API_VERSION;
- init.n_frames = DV1394_MAX_FRAMES / 4;
- init.channel = video->channel;
- init.format = video->pal_or_ntsc;
- init.cip_n = video->cip_n;
- init.cip_d = video->cip_d;
- init.syt_offset = video->syt_offset;
-
- return do_dv1394_init(video, &init);
-}
-
-/* do NOT call from interrupt context */
-static void stop_dma(struct video_card *video)
-{
- unsigned long flags;
- int i;
-
- /* no interrupts */
- spin_lock_irqsave(&video->spinlock, flags);
-
- video->dma_running = 0;
-
- if ( (video->ohci_it_ctx == -1) && (video->ohci_ir_ctx == -1) )
- goto out;
-
- /* stop DMA if in progress */
- if ( (video->active_frame != -1) ||
- (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
- (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
-
- /* clear the .run bits */
- reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
- reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
- flush_pci_write(video->ohci);
-
- video->active_frame = -1;
- video->first_run = 1;
-
- /* wait until DMA really stops */
- i = 0;
- while (i < 1000) {
-
- /* wait 0.1 millisecond */
- udelay(100);
-
- if ( (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
- (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
- /* still active */
- debug_printk("dv1394: stop_dma: DMA not stopped yet\n" );
- mb();
- } else {
- debug_printk("dv1394: stop_dma: DMA stopped safely after %d ms\n", i/10);
- break;
- }
-
- i++;
- }
-
- if (i == 1000) {
- printk(KERN_ERR "dv1394: stop_dma: DMA still going after %d ms!\n", i/10);
- }
- }
- else
- debug_printk("dv1394: stop_dma: already stopped.\n");
-
-out:
- spin_unlock_irqrestore(&video->spinlock, flags);
-}
-
-
-
-static void do_dv1394_shutdown(struct video_card *video, int free_dv_buf)
-{
- int i;
-
- debug_printk("dv1394: shutdown...\n");
-
- /* stop DMA if in progress */
- stop_dma(video);
-
- /* release the DMA contexts */
- if (video->ohci_it_ctx != -1) {
- video->ohci_IsoXmitContextControlSet = 0;
- video->ohci_IsoXmitContextControlClear = 0;
- video->ohci_IsoXmitCommandPtr = 0;
-
- /* disable interrupts for IT context */
- reg_write(video->ohci, OHCI1394_IsoXmitIntMaskClear, (1 << video->ohci_it_ctx));
-
- /* remove tasklet */
- ohci1394_unregister_iso_tasklet(video->ohci, &video->it_tasklet);
- debug_printk("dv1394: IT context %d released\n", video->ohci_it_ctx);
- video->ohci_it_ctx = -1;
- }
-
- if (video->ohci_ir_ctx != -1) {
- video->ohci_IsoRcvContextControlSet = 0;
- video->ohci_IsoRcvContextControlClear = 0;
- video->ohci_IsoRcvCommandPtr = 0;
- video->ohci_IsoRcvContextMatch = 0;
-
- /* disable interrupts for IR context */
- reg_write(video->ohci, OHCI1394_IsoRecvIntMaskClear, (1 << video->ohci_ir_ctx));
-
- /* remove tasklet */
- ohci1394_unregister_iso_tasklet(video->ohci, &video->ir_tasklet);
- debug_printk("dv1394: IR context %d released\n", video->ohci_ir_ctx);
- video->ohci_ir_ctx = -1;
- }
-
- /* release the ISO channel */
- if (video->channel != -1) {
- u64 chan_mask;
- unsigned long flags;
-
- chan_mask = (u64)1 << video->channel;
-
- spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
- video->ohci->ISO_channel_usage &= ~(chan_mask);
- spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
-
- video->channel = -1;
- }
-
- /* free the frame structs */
- for (i = 0; i < DV1394_MAX_FRAMES; i++) {
- if (video->frames[i])
- frame_delete(video->frames[i]);
- video->frames[i] = NULL;
- }
-
- video->n_frames = 0;
-
- /* we can't free the DMA buffer unless it is guaranteed that
- no more user-space mappings exist */
-
- if (free_dv_buf) {
- dma_region_free(&video->dv_buf);
- video->dv_buf_size = 0;
- }
-
- /* free packet buffer */
- dma_region_free(&video->packet_buf);
- video->packet_buf_size = 0;
-
- debug_printk("dv1394: shutdown OK\n");
-}
-
-/*
- **********************************
- *** MMAP() THEORY OF OPERATION ***
- **********************************
-
- The ringbuffer cannot be re-allocated or freed while
- a user program maintains a mapping of it. (note that a mapping
- can persist even after the device fd is closed!)
-
- So, only let the user process allocate the DMA buffer once.
- To resize or deallocate it, you must close the device file
- and open it again.
-
- Previously Dan M. hacked out a scheme that allowed the DMA
- buffer to change by forcefully unmapping it from the user's
- address space. It was prone to error because it's very hard to
- track all the places the buffer could have been mapped (we
- would have had to walk the vma list of every process in the
- system to be sure we found all the mappings!). Instead, we
- force the user to choose one buffer size and stick with
- it. This small sacrifice is worth the huge reduction in
- error-prone code in dv1394.
-*/
-
-static int dv1394_mmap(struct file *file, struct vm_area_struct *vma)
-{
- struct video_card *video = file_to_video_card(file);
- int retval = -EINVAL;
-
- /*
- * We cannot use the blocking variant mutex_lock here because .mmap
- * is called with mmap_sem held, while .ioctl, .read, .write acquire
- * video->mtx and subsequently call copy_to/from_user which will
- * grab mmap_sem in case of a page fault.
- */
- if (!mutex_trylock(&video->mtx))
- return -EAGAIN;
-
- if ( ! video_card_initialized(video) ) {
- retval = do_dv1394_init_default(video);
- if (retval)
- goto out;
- }
-
- retval = dma_region_mmap(&video->dv_buf, file, vma);
-out:
- mutex_unlock(&video->mtx);
- return retval;
-}
-
-/*** DEVICE FILE INTERFACE *************************************************/
-
-/* no need to serialize, multiple threads OK */
-static unsigned int dv1394_poll(struct file *file, struct poll_table_struct *wait)
-{
- struct video_card *video = file_to_video_card(file);
- unsigned int mask = 0;
- unsigned long flags;
-
- poll_wait(file, &video->waitq, wait);
-
- spin_lock_irqsave(&video->spinlock, flags);
- if ( video->n_frames == 0 ) {
-
- } else if ( video->active_frame == -1 ) {
- /* nothing going on */
- mask |= POLLOUT;
- } else {
- /* any clear/ready buffers? */
- if (video->n_clear_frames >0)
- mask |= POLLOUT | POLLIN;
- }
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- return mask;
-}
-
-static int dv1394_fasync(int fd, struct file *file, int on)
-{
- /* I just copied this code verbatim from Alan Cox's mouse driver example
- (Documentation/DocBook/) */
-
- struct video_card *video = file_to_video_card(file);
-
- return fasync_helper(fd, file, on, &video->fasync);
-}
-
-static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
-{
- struct video_card *video = file_to_video_card(file);
- DECLARE_WAITQUEUE(wait, current);
- ssize_t ret;
- size_t cnt;
- unsigned long flags;
- int target_frame;
-
- /* serialize this to prevent multi-threaded mayhem */
- if (file->f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&video->mtx))
- return -EAGAIN;
- } else {
- if (mutex_lock_interruptible(&video->mtx))
- return -ERESTARTSYS;
- }
-
- if ( !video_card_initialized(video) ) {
- ret = do_dv1394_init_default(video);
- if (ret) {
- mutex_unlock(&video->mtx);
- return ret;
- }
- }
-
- ret = 0;
- add_wait_queue(&video->waitq, &wait);
-
- while (count > 0) {
-
- /* must set TASK_INTERRUPTIBLE *before* checking for free
- buffers; otherwise we could miss a wakeup if the interrupt
- fires between the check and the schedule() */
-
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- target_frame = video->first_clear_frame;
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- if (video->frames[target_frame]->state == FRAME_CLEAR) {
-
- /* how much room is left in the target frame buffer */
- cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
-
- } else {
- /* buffer is already used */
- cnt = 0;
- }
-
- if (cnt > count)
- cnt = count;
-
- if (cnt <= 0) {
- /* no room left, gotta wait */
- if (file->f_flags & O_NONBLOCK) {
- if (!ret)
- ret = -EAGAIN;
- break;
- }
- if (signal_pending(current)) {
- if (!ret)
- ret = -ERESTARTSYS;
- break;
- }
-
- schedule();
-
- continue; /* start over from 'while(count > 0)...' */
- }
-
- if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) {
- if (!ret)
- ret = -EFAULT;
- break;
- }
-
- video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
-
- count -= cnt;
- buffer += cnt;
- ret += cnt;
-
- if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames))
- frame_prepare(video, target_frame);
- }
-
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
- mutex_unlock(&video->mtx);
- return ret;
-}
-
-
-static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
- struct video_card *video = file_to_video_card(file);
- DECLARE_WAITQUEUE(wait, current);
- ssize_t ret;
- size_t cnt;
- unsigned long flags;
- int target_frame;
-
- /* serialize this to prevent multi-threaded mayhem */
- if (file->f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&video->mtx))
- return -EAGAIN;
- } else {
- if (mutex_lock_interruptible(&video->mtx))
- return -ERESTARTSYS;
- }
-
- if ( !video_card_initialized(video) ) {
- ret = do_dv1394_init_default(video);
- if (ret) {
- mutex_unlock(&video->mtx);
- return ret;
- }
- video->continuity_counter = -1;
-
- receive_packets(video);
-
- start_dma_receive(video);
- }
-
- ret = 0;
- add_wait_queue(&video->waitq, &wait);
-
- while (count > 0) {
-
- /* must set TASK_INTERRUPTIBLE *before* checking for free
- buffers; otherwise we could miss a wakeup if the interrupt
- fires between the check and the schedule() */
-
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- target_frame = video->first_clear_frame;
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- if (target_frame >= 0 &&
- video->n_clear_frames > 0 &&
- video->frames[target_frame]->state == FRAME_CLEAR) {
-
- /* how much room is left in the target frame buffer */
- cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
-
- } else {
- /* buffer is already used */
- cnt = 0;
- }
-
- if (cnt > count)
- cnt = count;
-
- if (cnt <= 0) {
- /* no room left, gotta wait */
- if (file->f_flags & O_NONBLOCK) {
- if (!ret)
- ret = -EAGAIN;
- break;
- }
- if (signal_pending(current)) {
- if (!ret)
- ret = -ERESTARTSYS;
- break;
- }
-
- schedule();
-
- continue; /* start over from 'while(count > 0)...' */
- }
-
- if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) {
- if (!ret)
- ret = -EFAULT;
- break;
- }
-
- video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
-
- count -= cnt;
- buffer += cnt;
- ret += cnt;
-
- if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) {
- spin_lock_irqsave(&video->spinlock, flags);
- video->n_clear_frames--;
- video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
- spin_unlock_irqrestore(&video->spinlock, flags);
- }
- }
-
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
- mutex_unlock(&video->mtx);
- return ret;
-}
-
-
-/*** DEVICE IOCTL INTERFACE ************************************************/
-
-static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct video_card *video = file_to_video_card(file);
- unsigned long flags;
- int ret = -EINVAL;
- void __user *argp = (void __user *)arg;
-
- DECLARE_WAITQUEUE(wait, current);
-
- /* serialize this to prevent multi-threaded mayhem */
- if (file->f_flags & O_NONBLOCK) {
- if (!mutex_trylock(&video->mtx))
- return -EAGAIN;
- } else {
- if (mutex_lock_interruptible(&video->mtx))
- return -ERESTARTSYS;
- }
-
- switch(cmd)
- {
- case DV1394_IOC_SUBMIT_FRAMES: {
- unsigned int n_submit;
-
- if ( !video_card_initialized(video) ) {
- ret = do_dv1394_init_default(video);
- if (ret)
- goto out;
- }
-
- n_submit = (unsigned int) arg;
-
- if (n_submit > video->n_frames) {
- ret = -EINVAL;
- goto out;
- }
-
- while (n_submit > 0) {
-
- add_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- /* wait until video->first_clear_frame is really CLEAR */
- while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) {
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- if (signal_pending(current)) {
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
- ret = -EINTR;
- goto out;
- }
-
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
- }
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
-
- frame_prepare(video, video->first_clear_frame);
-
- n_submit--;
- }
-
- ret = 0;
- break;
- }
-
- case DV1394_IOC_WAIT_FRAMES: {
- unsigned int n_wait;
-
- if ( !video_card_initialized(video) ) {
- ret = -EINVAL;
- goto out;
- }
-
- n_wait = (unsigned int) arg;
-
- /* since we re-run the last frame on underflow, we will
- never actually have n_frames clear frames; at most only
- n_frames - 1 */
-
- if (n_wait > (video->n_frames-1) ) {
- ret = -EINVAL;
- goto out;
- }
-
- add_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- while (video->n_clear_frames < n_wait) {
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- if (signal_pending(current)) {
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
- ret = -EINTR;
- goto out;
- }
-
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_irqsave(&video->spinlock, flags);
- }
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- remove_wait_queue(&video->waitq, &wait);
- set_current_state(TASK_RUNNING);
- ret = 0;
- break;
- }
-
- case DV1394_IOC_RECEIVE_FRAMES: {
- unsigned int n_recv;
-
- if ( !video_card_initialized(video) ) {
- ret = -EINVAL;
- goto out;
- }
-
- n_recv = (unsigned int) arg;
-
- /* at least one frame must be active */
- if (n_recv > (video->n_frames-1) ) {
- ret = -EINVAL;
- goto out;
- }
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- /* release the clear frames */
- video->n_clear_frames -= n_recv;
-
- /* advance the clear frame cursor */
- video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames;
-
- /* reset dropped_frames */
- video->dropped_frames = 0;
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- ret = 0;
- break;
- }
-
- case DV1394_IOC_START_RECEIVE: {
- if ( !video_card_initialized(video) ) {
- ret = do_dv1394_init_default(video);
- if (ret)
- goto out;
- }
-
- video->continuity_counter = -1;
-
- receive_packets(video);
-
- start_dma_receive(video);
-
- ret = 0;
- break;
- }
-
- case DV1394_IOC_INIT: {
- struct dv1394_init init;
- if (!argp) {
- ret = do_dv1394_init_default(video);
- } else {
- if (copy_from_user(&init, argp, sizeof(init))) {
- ret = -EFAULT;
- goto out;
- }
- ret = do_dv1394_init(video, &init);
- }
- break;
- }
-
- case DV1394_IOC_SHUTDOWN:
- do_dv1394_shutdown(video, 0);
- ret = 0;
- break;
-
-
- case DV1394_IOC_GET_STATUS: {
- struct dv1394_status status;
-
- if ( !video_card_initialized(video) ) {
- ret = -EINVAL;
- goto out;
- }
-
- status.init.api_version = DV1394_API_VERSION;
- status.init.channel = video->channel;
- status.init.n_frames = video->n_frames;
- status.init.format = video->pal_or_ntsc;
- status.init.cip_n = video->cip_n;
- status.init.cip_d = video->cip_d;
- status.init.syt_offset = video->syt_offset;
-
- status.first_clear_frame = video->first_clear_frame;
-
- /* the rest of the fields need to be locked against the interrupt */
- spin_lock_irqsave(&video->spinlock, flags);
-
- status.active_frame = video->active_frame;
- status.n_clear_frames = video->n_clear_frames;
-
- status.dropped_frames = video->dropped_frames;
-
- /* reset dropped_frames */
- video->dropped_frames = 0;
-
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- if (copy_to_user(argp, &status, sizeof(status))) {
- ret = -EFAULT;
- goto out;
- }
-
- ret = 0;
- break;
- }
-
- default:
- break;
- }
-
- out:
- mutex_unlock(&video->mtx);
- return ret;
-}
-
-/*** DEVICE FILE INTERFACE CONTINUED ***************************************/
-
-static int dv1394_open(struct inode *inode, struct file *file)
-{
- struct video_card *video = NULL;
-
- if (file->private_data) {
- video = file->private_data;
-
- } else {
- /* look up the card by ID */
- unsigned long flags;
- int idx = ieee1394_file_to_instance(file);
-
- spin_lock_irqsave(&dv1394_cards_lock, flags);
- if (!list_empty(&dv1394_cards)) {
- struct video_card *p;
- list_for_each_entry(p, &dv1394_cards, list) {
- if ((p->id) == idx) {
- video = p;
- break;
- }
- }
- }
- spin_unlock_irqrestore(&dv1394_cards_lock, flags);
-
- if (!video) {
- debug_printk("dv1394: OHCI card %d not found", idx);
- return -ENODEV;
- }
-
- file->private_data = (void*) video;
- }
-
-#ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN
-
- if ( test_and_set_bit(0, &video->open) ) {
- /* video is already open by someone else */
- return -EBUSY;
- }
-
-#endif
-
- printk(KERN_INFO "%s: NOTE, the dv1394 interface is unsupported "
- "and will not be available in the new firewire driver stack. "
- "Try libraw1394 based programs instead.\n", current->comm);
-
- return nonseekable_open(inode, file);
-}
-
-
-static int dv1394_release(struct inode *inode, struct file *file)
-{
- struct video_card *video = file_to_video_card(file);
-
- /* OK to free the DMA buffer, no more mappings can exist */
- do_dv1394_shutdown(video, 1);
-
- /* give someone else a turn */
- clear_bit(0, &video->open);
-
- return 0;
-}
-
-
-/*** DEVICE DRIVER HANDLERS ************************************************/
-
-static void it_tasklet_func(unsigned long data)
-{
- int wake = 0;
- struct video_card *video = (struct video_card*) data;
-
- spin_lock(&video->spinlock);
-
- if (!video->dma_running)
- goto out;
-
- irq_printk("ContextControl = %08x, CommandPtr = %08x\n",
- reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
- reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
- );
-
-
- if ( (video->ohci_it_ctx != -1) &&
- (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
-
- struct frame *f;
- unsigned int frame, i;
-
-
- if (video->active_frame == -1)
- frame = 0;
- else
- frame = video->active_frame;
-
- /* check all the DMA-able frames */
- for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) {
-
- irq_printk("IRQ checking frame %d...", frame);
- f = video->frames[frame];
- if (f->state != FRAME_READY) {
- irq_printk("clear, skipping\n");
- /* we don't own this frame */
- continue;
- }
-
- irq_printk("DMA\n");
-
- /* check the frame begin semaphore to see if we can free the previous frame */
- if ( *(f->frame_begin_timestamp) ) {
- int prev_frame;
- struct frame *prev_f;
-
-
-
- /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */
- irq_printk(" BEGIN\n");
-
- prev_frame = frame - 1;
- if (prev_frame == -1)
- prev_frame += video->n_frames;
- prev_f = video->frames[prev_frame];
-
- /* make sure we can actually garbage collect
- this frame */
- if ( (prev_f->state == FRAME_READY) &&
- prev_f->done && (!f->done) )
- {
- frame_reset(prev_f);
- video->n_clear_frames++;
- wake = 1;
- video->active_frame = frame;
-
- irq_printk(" BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame);
- } else {
- irq_printk(" BEGIN - can't free yet\n");
- }
-
- f->done = 1;
- }
-
-
- /* see if we need to set the timestamp for the next frame */
- if ( *(f->mid_frame_timestamp) ) {
- struct frame *next_frame;
- u32 begin_ts, ts_cyc, ts_off;
-
- *(f->mid_frame_timestamp) = 0;
-
- begin_ts = le32_to_cpu(*(f->frame_begin_timestamp));
-
- irq_printk(" MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n",
- begin_ts & 0x1FFF, begin_ts & 0xF,
- f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF);
-
- /* prepare next frame and assign timestamp */
- next_frame = video->frames[ (frame+1) % video->n_frames ];
-
- if (next_frame->state == FRAME_READY) {
- irq_printk(" MIDDLE - next frame is ready, good\n");
- } else {
- debug_printk("dv1394: Underflow! At least one frame has been dropped.\n");
- next_frame = f;
- }
-
- /* set the timestamp to the timestamp of the last frame sent,
- plus the length of the last frame sent, plus the syt latency */
- ts_cyc = begin_ts & 0xF;
- /* advance one frame, plus syt latency (typically 2-3) */
- ts_cyc += f->n_packets + video->syt_offset ;
-
- ts_off = 0;
-
- ts_cyc += ts_off/3072;
- ts_off %= 3072;
-
- next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off;
- if (next_frame->cip_syt1) {
- next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8;
- next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF;
- }
- if (next_frame->cip_syt2) {
- next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8;
- next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF;
- }
-
- }
-
- /* see if the frame looped */
- if ( *(f->frame_end_timestamp) ) {
-
- *(f->frame_end_timestamp) = 0;
-
- debug_printk(" END - the frame looped at least once\n");
-
- video->dropped_frames++;
- }
-
- } /* for (each frame) */
- }
-
- if (wake) {
- kill_fasync(&video->fasync, SIGIO, POLL_OUT);
-
- /* wake readers/writers/ioctl'ers */
- wake_up_interruptible(&video->waitq);
- }
-
-out:
- spin_unlock(&video->spinlock);
-}
-
-static void ir_tasklet_func(unsigned long data)
-{
- int wake = 0;
- struct video_card *video = (struct video_card*) data;
-
- spin_lock(&video->spinlock);
-
- if (!video->dma_running)
- goto out;
-
- if ( (video->ohci_ir_ctx != -1) &&
- (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) {
-
- int sof=0; /* start-of-frame flag */
- struct frame *f;
- u16 packet_length;
- int i, dbc=0;
- struct DMA_descriptor_block *block = NULL;
- u16 xferstatus;
-
- int next_i, prev_i;
- struct DMA_descriptor_block *next = NULL;
- dma_addr_t next_dma = 0;
- struct DMA_descriptor_block *prev = NULL;
-
- /* loop over all descriptors in all frames */
- for (i = 0; i < video->n_frames*MAX_PACKETS; i++) {
- struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet);
-
- /* make sure we are seeing the latest changes to p */
- dma_region_sync_for_cpu(&video->packet_buf,
- (unsigned long) p - (unsigned long) video->packet_buf.kvirt,
- sizeof(struct packet));
-
- packet_length = le16_to_cpu(p->data_length);
-
- /* get the descriptor based on packet_buffer cursor */
- f = video->frames[video->current_packet / MAX_PACKETS];
- block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]);
- xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16;
- xferstatus &= 0x1F;
- irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) );
-
- /* get the current frame */
- f = video->frames[video->active_frame];
-
- /* exclude empty packet */
- if (packet_length > 8 && xferstatus == 0x11) {
- /* check for start of frame */
- /* DRD> Changed to check section type ([0]>>5==0)
- and dif sequence ([1]>>4==0) */
- sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0);
-
- dbc = (int) (p->cip_h1 >> 24);
- if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) )
- {
- printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" );
- video->dropped_frames += video->n_clear_frames + 1;
- video->first_frame = 0;
- video->n_clear_frames = 0;
- video->first_clear_frame = -1;
- }
- video->continuity_counter = dbc;
-
- if (!video->first_frame) {
- if (sof) {
- video->first_frame = 1;
- }
-
- } else if (sof) {
- /* close current frame */
- frame_reset(f); /* f->state = STATE_CLEAR */
- video->n_clear_frames++;
- if (video->n_clear_frames > video->n_frames) {
- video->dropped_frames++;
- printk(KERN_WARNING "dv1394: dropped a frame during reception\n" );
- video->n_clear_frames = video->n_frames-1;
- video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
- }
- if (video->first_clear_frame == -1)
- video->first_clear_frame = video->active_frame;
-
- /* get the next frame */
- video->active_frame = (video->active_frame + 1) % video->n_frames;
- f = video->frames[video->active_frame];
- irq_printk(" frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n",
- video->active_frame, video->n_clear_frames, video->first_clear_frame);
- }
- if (video->first_frame) {
- if (sof) {
- /* open next frame */
- f->state = FRAME_READY;
- }
-
- /* copy to buffer */
- if (f->n_packets > (video->frame_size / 480)) {
- printk(KERN_ERR "frame buffer overflow during receive\n");
- }
-
- frame_put_packet(f, p);
-
- } /* first_frame */
- }
-
- /* stop, end of ready packets */
- else if (xferstatus == 0) {
- break;
- }
-
- /* reset xferStatus & resCount */
- block->u.in.il.q[3] = cpu_to_le32(512);
-
- /* terminate dma chain at this (next) packet */
- next_i = video->current_packet;
- f = video->frames[next_i / MAX_PACKETS];
- next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
- next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
- next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
- next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */
-
- /* link previous to next */
- prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
- f = video->frames[prev_i / MAX_PACKETS];
- prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
- if (prev_i % (MAX_PACKETS/2)) {
- prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */
- } else {
- prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
- }
- prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
- wmb();
-
- /* wake up DMA in case it fell asleep */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
-
- /* advance packet_buffer cursor */
- video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames);
-
- } /* for all packets */
-
- wake = 1; /* why the hell not? */
-
- } /* receive interrupt */
-
- if (wake) {
- kill_fasync(&video->fasync, SIGIO, POLL_IN);
-
- /* wake readers/writers/ioctl'ers */
- wake_up_interruptible(&video->waitq);
- }
-
-out:
- spin_unlock(&video->spinlock);
-}
-
-static struct cdev dv1394_cdev;
-static const struct file_operations dv1394_fops=
-{
- .owner = THIS_MODULE,
- .poll = dv1394_poll,
- .unlocked_ioctl = dv1394_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = dv1394_compat_ioctl,
-#endif
- .mmap = dv1394_mmap,
- .open = dv1394_open,
- .write = dv1394_write,
- .read = dv1394_read,
- .release = dv1394_release,
- .fasync = dv1394_fasync,
- .llseek = no_llseek,
-};
-
-
-/*** HOTPLUG STUFF **********************************************************/
-/*
- * Export information about protocols/devices supported by this driver.
- */
-#ifdef MODULE
-static const struct ieee1394_device_id dv1394_id_table[] = {
- {
- .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
- .specifier_id = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff,
- .version = AVC_SW_VERSION_ENTRY & 0xffffff
- },
- { }
-};
-
-MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table);
-#endif /* MODULE */
-
-static struct hpsb_protocol_driver dv1394_driver = {
- .name = "dv1394",
-};
-
-
-/*** IEEE1394 HPSB CALLBACKS ***********************************************/
-
-static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode)
-{
- struct video_card *video;
- unsigned long flags;
- int i;
-
- video = kzalloc(sizeof(*video), GFP_KERNEL);
- if (!video) {
- printk(KERN_ERR "dv1394: cannot allocate video_card\n");
- return -1;
- }
-
- video->ohci = ohci;
- /* lower 2 bits of id indicate which of four "plugs"
- per host */
- video->id = ohci->host->id << 2;
- if (format == DV1394_NTSC)
- video->id |= mode;
- else
- video->id |= 2 + mode;
-
- video->ohci_it_ctx = -1;
- video->ohci_ir_ctx = -1;
-
- video->ohci_IsoXmitContextControlSet = 0;
- video->ohci_IsoXmitContextControlClear = 0;
- video->ohci_IsoXmitCommandPtr = 0;
-
- video->ohci_IsoRcvContextControlSet = 0;
- video->ohci_IsoRcvContextControlClear = 0;
- video->ohci_IsoRcvCommandPtr = 0;
- video->ohci_IsoRcvContextMatch = 0;
-
- video->n_frames = 0; /* flag that video is not initialized */
- video->channel = 63; /* default to broadcast channel */
- video->active_frame = -1;
-
- /* initialize the following */
- video->pal_or_ntsc = format;
- video->cip_n = 0; /* 0 = use builtin default */
- video->cip_d = 0;
- video->syt_offset = 0;
- video->mode = mode;
-
- for (i = 0; i < DV1394_MAX_FRAMES; i++)
- video->frames[i] = NULL;
-
- dma_region_init(&video->dv_buf);
- video->dv_buf_size = 0;
- dma_region_init(&video->packet_buf);
- video->packet_buf_size = 0;
-
- clear_bit(0, &video->open);
- spin_lock_init(&video->spinlock);
- video->dma_running = 0;
- mutex_init(&video->mtx);
- init_waitqueue_head(&video->waitq);
- video->fasync = NULL;
-
- spin_lock_irqsave(&dv1394_cards_lock, flags);
- INIT_LIST_HEAD(&video->list);
- list_add_tail(&video->list, &dv1394_cards);
- spin_unlock_irqrestore(&dv1394_cards_lock, flags);
-
- debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id);
- return 0;
-}
-
-static void dv1394_remove_host(struct hpsb_host *host)
-{
- struct video_card *video, *tmp_video;
- unsigned long flags;
- int found_ohci_card = 0;
-
- do {
- video = NULL;
- spin_lock_irqsave(&dv1394_cards_lock, flags);
- list_for_each_entry(tmp_video, &dv1394_cards, list) {
- if ((tmp_video->id >> 2) == host->id) {
- list_del(&tmp_video->list);
- video = tmp_video;
- found_ohci_card = 1;
- break;
- }
- }
- spin_unlock_irqrestore(&dv1394_cards_lock, flags);
-
- if (video) {
- do_dv1394_shutdown(video, 1);
- kfree(video);
- }
- } while (video);
-
- if (found_ohci_card)
- device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
- IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2)));
-}
-
-static void dv1394_add_host(struct hpsb_host *host)
-{
- struct ti_ohci *ohci;
- int id = host->id;
-
- /* We only work with the OHCI-1394 driver */
- if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
- return;
-
- ohci = (struct ti_ohci *)host->hostdata;
-
- device_create(hpsb_protocol_class, NULL,
- MKDEV(IEEE1394_MAJOR,
- IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)),
- NULL, "dv1394-%d", id);
-
- dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE);
- dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT);
- dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE);
- dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT);
-}
-
-
-/* Bus reset handler. In the event of a bus reset, we may need to
- re-start the DMA contexts - otherwise the user program would
- end up waiting forever.
-*/
-
-static void dv1394_host_reset(struct hpsb_host *host)
-{
- struct video_card *video = NULL, *tmp_vid;
- unsigned long flags;
-
- /* We only work with the OHCI-1394 driver */
- if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
- return;
-
- /* find the corresponding video_cards */
- spin_lock_irqsave(&dv1394_cards_lock, flags);
- list_for_each_entry(tmp_vid, &dv1394_cards, list) {
- if ((tmp_vid->id >> 2) == host->id) {
- video = tmp_vid;
- break;
- }
- }
- spin_unlock_irqrestore(&dv1394_cards_lock, flags);
-
- if (!video)
- return;
-
-
- spin_lock_irqsave(&video->spinlock, flags);
-
- if (!video->dma_running)
- goto out;
-
- /* check IT context */
- if (video->ohci_it_ctx != -1) {
- u32 ctx;
-
- ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet);
-
- /* if (RUN but not ACTIVE) */
- if ( (ctx & (1<<15)) &&
- !(ctx & (1<<10)) ) {
-
- debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n");
-
- /* to be safe, assume a frame has been dropped. User-space programs
- should handle this condition like an underflow. */
- video->dropped_frames++;
-
- /* for some reason you must clear, then re-set the RUN bit to restart DMA */
-
- /* clear RUN */
- reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
- flush_pci_write(video->ohci);
-
- /* set RUN */
- reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15));
- flush_pci_write(video->ohci);
-
- /* set the WAKE bit (just in case; this isn't strictly necessary) */
- reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12));
- flush_pci_write(video->ohci);
-
- irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n",
- reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
- reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
- }
- }
-
- /* check IR context */
- if (video->ohci_ir_ctx != -1) {
- u32 ctx;
-
- ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet);
-
- /* if (RUN but not ACTIVE) */
- if ( (ctx & (1<<15)) &&
- !(ctx & (1<<10)) ) {
-
- debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n");
-
- /* to be safe, assume a frame has been dropped. User-space programs
- should handle this condition like an overflow. */
- video->dropped_frames++;
-
- /* for some reason you must clear, then re-set the RUN bit to restart DMA */
- /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */
-
- /* clear RUN */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
- flush_pci_write(video->ohci);
-
- /* set RUN */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15));
- flush_pci_write(video->ohci);
-
- /* set the WAKE bit (just in case; this isn't strictly necessary) */
- reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
- flush_pci_write(video->ohci);
-
- irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n",
- reg_read(video->ohci, video->ohci_IsoRcvContextControlSet),
- reg_read(video->ohci, video->ohci_IsoRcvCommandPtr));
- }
- }
-
-out:
- spin_unlock_irqrestore(&video->spinlock, flags);
-
- /* wake readers/writers/ioctl'ers */
- wake_up_interruptible(&video->waitq);
-}
-
-static struct hpsb_highlevel dv1394_highlevel = {
- .name = "dv1394",
- .add_host = dv1394_add_host,
- .remove_host = dv1394_remove_host,
- .host_reset = dv1394_host_reset,
-};
-
-#ifdef CONFIG_COMPAT
-
-#define DV1394_IOC32_INIT _IOW('#', 0x06, struct dv1394_init32)
-#define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32)
-
-struct dv1394_init32 {
- u32 api_version;
- u32 channel;
- u32 n_frames;
- u32 format;
- u32 cip_n;
- u32 cip_d;
- u32 syt_offset;
-};
-
-struct dv1394_status32 {
- struct dv1394_init32 init;
- s32 active_frame;
- u32 first_clear_frame;
- u32 n_clear_frames;
- u32 dropped_frames;
-};
-
-/* RED-PEN: this should use compat_alloc_userspace instead */
-
-static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct dv1394_init32 dv32;
- struct dv1394_init dv;
- mm_segment_t old_fs;
- int ret;
-
- if (file->f_op->unlocked_ioctl != dv1394_ioctl)
- return -EFAULT;
-
- if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32)))
- return -EFAULT;
-
- dv.api_version = dv32.api_version;
- dv.channel = dv32.channel;
- dv.n_frames = dv32.n_frames;
- dv.format = dv32.format;
- dv.cip_n = (unsigned long)dv32.cip_n;
- dv.cip_d = (unsigned long)dv32.cip_d;
- dv.syt_offset = dv32.syt_offset;
-
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv);
- set_fs(old_fs);
-
- return ret;
-}
-
-static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct dv1394_status32 dv32;
- struct dv1394_status dv;
- mm_segment_t old_fs;
- int ret;
-
- if (file->f_op->unlocked_ioctl != dv1394_ioctl)
- return -EFAULT;
-
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv);
- set_fs(old_fs);
-
- if (!ret) {
- dv32.init.api_version = dv.init.api_version;
- dv32.init.channel = dv.init.channel;
- dv32.init.n_frames = dv.init.n_frames;
- dv32.init.format = dv.init.format;
- dv32.init.cip_n = (u32)dv.init.cip_n;
- dv32.init.cip_d = (u32)dv.init.cip_d;
- dv32.init.syt_offset = dv.init.syt_offset;
- dv32.active_frame = dv.active_frame;
- dv32.first_clear_frame = dv.first_clear_frame;
- dv32.n_clear_frames = dv.n_clear_frames;
- dv32.dropped_frames = dv.dropped_frames;
-
- if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32)))
- ret = -EFAULT;
- }
-
- return ret;
-}
-
-
-
-static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- switch (cmd) {
- case DV1394_IOC_SHUTDOWN:
- case DV1394_IOC_SUBMIT_FRAMES:
- case DV1394_IOC_WAIT_FRAMES:
- case DV1394_IOC_RECEIVE_FRAMES:
- case DV1394_IOC_START_RECEIVE:
- return dv1394_ioctl(file, cmd, arg);
-
- case DV1394_IOC32_INIT:
- return handle_dv1394_init(file, cmd, arg);
- case DV1394_IOC32_GET_STATUS:
- return handle_dv1394_get_status(file, cmd, arg);
- default:
- return -ENOIOCTLCMD;
- }
-}
-
-#endif /* CONFIG_COMPAT */
-
-
-/*** KERNEL MODULE HANDLERS ************************************************/
-
-MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>");
-MODULE_DESCRIPTION("driver for DV input/output on OHCI board");
-MODULE_SUPPORTED_DEVICE("dv1394");
-MODULE_LICENSE("GPL");
-
-static void __exit dv1394_exit_module(void)
-{
- hpsb_unregister_protocol(&dv1394_driver);
- hpsb_unregister_highlevel(&dv1394_highlevel);
- cdev_del(&dv1394_cdev);
-}
-
-static int __init dv1394_init_module(void)
-{
- int ret;
-
- cdev_init(&dv1394_cdev, &dv1394_fops);
- dv1394_cdev.owner = THIS_MODULE;
- ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16);
- if (ret) {
- printk(KERN_ERR "dv1394: unable to register character device\n");
- return ret;
- }
-
- hpsb_register_highlevel(&dv1394_highlevel);
-
- ret = hpsb_register_protocol(&dv1394_driver);
- if (ret) {
- printk(KERN_ERR "dv1394: failed to register protocol\n");
- hpsb_unregister_highlevel(&dv1394_highlevel);
- cdev_del(&dv1394_cdev);
- return ret;
- }
-
- return 0;
-}
-
-module_init(dv1394_init_module);
-module_exit(dv1394_exit_module);
projects / mv-sheeva.git / blobdiff