diff options
Diffstat (limited to 'drivers/ieee1394/dv1394.c')
| -rw-r--r-- | drivers/ieee1394/dv1394.c | 2584 |
1 files changed, 0 insertions, 2584 deletions
diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c deleted file mode 100644 index c5a031b..0000000 --- a/drivers/ieee1394/dv1394.c +++ /dev/null @@ -1,2584 +0,0 @@ -/* - * 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); |
