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 c5a031b79d0..00000000000 --- 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) |