Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1527 insertions, 0 deletions

diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
new file mode 100644
index 000000000000..4bedf7113f40
--- /dev/null
+++ b/drivers/ieee1394/video1394.c
@@ -0,0 +1,1527 @@
+/*
+ * video1394.c - video driver for OHCI 1394 boards
+ * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
+ *                        Peter Schlaile <udbz@rz.uni-karlsruhe.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * NOTES:
+ *
+ * jds -- add private data to file to keep track of iso contexts associated
+ * with each open -- so release won't kill all iso transfers.
+ * 
+ * Damien Douxchamps: Fix failure when the number of DMA pages per frame is
+ * one.
+ * 
+ * ioctl return codes:
+ * EFAULT is only for invalid address for the argp
+ * EINVAL for out of range values
+ * EBUSY when trying to use an already used resource
+ * ESRCH when trying to free/stop a not used resource
+ * EAGAIN for resource allocation failure that could perhaps succeed later
+ * ENOTTY for unsupported ioctl request
+ *
+ */
+
+#include <linux/config.h>
+#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/smp_lock.h>
+#include <linux/delay.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+#include <linux/timex.h>
+#include <linux/mm.h>
+#include <linux/ioctl32.h>
+#include <linux/compat.h>
+#include <linux/cdev.h>
+
+#include "ieee1394.h"
+#include "ieee1394_types.h"
+#include "hosts.h"
+#include "ieee1394_core.h"
+#include "highlevel.h"
+#include "video1394.h"
+#include "nodemgr.h"
+#include "dma.h"
+
+#include "ohci1394.h"
+
+#define ISO_CHANNELS 64
+
+#ifndef virt_to_page
+#define virt_to_page(x) MAP_NR(x)
+#endif
+
+#ifndef vmalloc_32
+#define vmalloc_32(x) vmalloc(x)
+#endif
+
+struct it_dma_prg {
+	struct dma_cmd begin;
+	quadlet_t data[4];
+	struct dma_cmd end;
+	quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
+};
+
+struct dma_iso_ctx {
+	struct ti_ohci *ohci;
+	int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
+	struct ohci1394_iso_tasklet iso_tasklet;
+	int channel;
+	int ctx;
+	int last_buffer;
+	int * next_buffer;  /* For ISO Transmit of video packets
+			       to write the correct SYT field
+			       into the next block */
+	unsigned int num_desc;
+	unsigned int buf_size;
+	unsigned int frame_size;
+	unsigned int packet_size;
+	unsigned int left_size;
+	unsigned int nb_cmd;
+
+	struct dma_region dma;
+
+	struct dma_prog_region *prg_reg;
+
+        struct dma_cmd **ir_prg;
+	struct it_dma_prg **it_prg;
+
+	unsigned int *buffer_status;
+        struct timeval *buffer_time; /* time when the buffer was received */
+	unsigned int *last_used_cmd; /* For ISO Transmit with
+					variable sized packets only ! */
+	int ctrlClear;
+	int ctrlSet;
+	int cmdPtr;
+	int ctxMatch;
+	wait_queue_head_t waitq;
+	spinlock_t lock;
+	unsigned int syt_offset;
+	int flags;
+
+	struct list_head link;
+};
+
+
+struct file_ctx {
+	struct ti_ohci *ohci;
+	struct list_head context_list;
+	struct dma_iso_ctx *current_ctx;
+};
+
+#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
+#define VIDEO1394_DEBUG
+#endif
+
+#ifdef DBGMSG
+#undef DBGMSG
+#endif
+
+#ifdef VIDEO1394_DEBUG
+#define DBGMSG(card, fmt, args...) \
+printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
+#else
+#define DBGMSG(card, fmt, args...)
+#endif
+
+/* print general (card independent) information */
+#define PRINT_G(level, fmt, args...) \
+printk(level "video1394: " fmt "\n" , ## args)
+
+/* print card specific information */
+#define PRINT(level, card, fmt, args...) \
+printk(level "video1394_%d: " fmt "\n" , card , ## args)
+
+static void wakeup_dma_ir_ctx(unsigned long l);
+static void wakeup_dma_it_ctx(unsigned long l);
+
+static struct hpsb_highlevel video1394_highlevel;
+
+static int free_dma_iso_ctx(struct dma_iso_ctx *d)
+{
+	int i;
+
+	DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
+
+	ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
+	if (d->iso_tasklet.link.next != NULL)
+		ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
+
+	dma_region_free(&d->dma);
+
+	if (d->prg_reg) {
+		for (i = 0; i < d->num_desc; i++)
+			dma_prog_region_free(&d->prg_reg[i]);
+		kfree(d->prg_reg);
+	}
+
+	if (d->ir_prg)
+		kfree(d->ir_prg);
+
+	if (d->it_prg)
+		kfree(d->it_prg);
+
+	if (d->buffer_status)
+		kfree(d->buffer_status);
+	if (d->buffer_time)
+		kfree(d->buffer_time);
+	if (d->last_used_cmd)
+		kfree(d->last_used_cmd);
+	if (d->next_buffer)
+		kfree(d->next_buffer);
+
+	list_del(&d->link);
+
+	kfree(d);
+
+	return 0;
+}
+
+static struct dma_iso_ctx *
+alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
+		  int buf_size, int channel, unsigned int packet_size)
+{
+	struct dma_iso_ctx *d;
+	int i;
+
+	d = kmalloc(sizeof(struct dma_iso_ctx), GFP_KERNEL);
+	if (d == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
+		return NULL;
+	}
+
+	memset(d, 0, sizeof *d);
+
+	d->ohci = ohci;
+	d->type = type;
+	d->channel = channel;
+	d->num_desc = num_desc;
+	d->frame_size = buf_size;
+	d->buf_size = PAGE_ALIGN(buf_size);
+	d->last_buffer = -1;
+	INIT_LIST_HEAD(&d->link);
+	init_waitqueue_head(&d->waitq);
+
+	/* Init the regions for easy cleanup */
+	dma_region_init(&d->dma);
+
+	if (dma_region_alloc(&d->dma, d->num_desc * d->buf_size, ohci->dev,
+			     PCI_DMA_BIDIRECTIONAL)) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+
+	if (type == OHCI_ISO_RECEIVE)
+		ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
+					  wakeup_dma_ir_ctx,
+					  (unsigned long) d);
+	else
+		ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
+					  wakeup_dma_it_ctx,
+					  (unsigned long) d);
+
+	if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
+		PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
+		      type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	d->ctx = d->iso_tasklet.context;
+
+	d->prg_reg = kmalloc(d->num_desc * sizeof(struct dma_prog_region),
+			GFP_KERNEL);
+	if (d->prg_reg == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	/* Makes for easier cleanup */
+	for (i = 0; i < d->num_desc; i++)
+		dma_prog_region_init(&d->prg_reg[i]);
+
+	if (type == OHCI_ISO_RECEIVE) {
+		d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
+		d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
+		d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
+		d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
+
+		d->ir_prg = kmalloc(d->num_desc * sizeof(struct dma_cmd *),
+				    GFP_KERNEL);
+
+		if (d->ir_prg == NULL) {
+			PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
+			free_dma_iso_ctx(d);
+			return NULL;
+		}
+		memset(d->ir_prg, 0, d->num_desc * sizeof(struct dma_cmd *));
+
+		d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
+		d->left_size = (d->frame_size % PAGE_SIZE) ?
+			d->frame_size % PAGE_SIZE : PAGE_SIZE;
+
+		for (i = 0;i < d->num_desc; i++) {
+			if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
+						  sizeof(struct dma_cmd), ohci->dev)) {
+				PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
+				free_dma_iso_ctx(d);
+				return NULL;
+			}
+			d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
+		}
+
+	} else {  /* OHCI_ISO_TRANSMIT */
+		d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
+		d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
+		d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
+
+		d->it_prg = kmalloc(d->num_desc * sizeof(struct it_dma_prg *),
+				    GFP_KERNEL);
+
+		if (d->it_prg == NULL) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Failed to allocate dma it prg");
+			free_dma_iso_ctx(d);
+			return NULL;
+		}
+		memset(d->it_prg, 0, d->num_desc*sizeof(struct it_dma_prg *));
+
+		d->packet_size = packet_size;
+
+		if (PAGE_SIZE % packet_size || packet_size>4096) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Packet size %d (page_size: %ld) "
+			      "not yet supported\n",
+			      packet_size, PAGE_SIZE);
+			free_dma_iso_ctx(d);
+			return NULL;
+		}
+
+		d->nb_cmd = d->frame_size / d->packet_size;
+		if (d->frame_size % d->packet_size) {
+			d->nb_cmd++;
+			d->left_size = d->frame_size % d->packet_size;
+		} else
+			d->left_size = d->packet_size;
+
+		for (i = 0; i < d->num_desc; i++) {
+			if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
+						sizeof(struct it_dma_prg), ohci->dev)) {
+				PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
+				free_dma_iso_ctx(d);
+				return NULL;
+			}
+			d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
+		}
+	}
+
+	d->buffer_status = kmalloc(d->num_desc * sizeof(unsigned int),
+				   GFP_KERNEL);
+	d->buffer_time = kmalloc(d->num_desc * sizeof(struct timeval),
+				   GFP_KERNEL);
+	d->last_used_cmd = kmalloc(d->num_desc * sizeof(unsigned int),
+				   GFP_KERNEL);
+	d->next_buffer = kmalloc(d->num_desc * sizeof(int),
+				 GFP_KERNEL);
+
+	if (d->buffer_status == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate buffer_status");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	if (d->buffer_time == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate buffer_time");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	if (d->last_used_cmd == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate last_used_cmd");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	if (d->next_buffer == NULL) {
+		PRINT(KERN_ERR, ohci->host->id, "Failed to allocate next_buffer");
+		free_dma_iso_ctx(d);
+		return NULL;
+	}
+	memset(d->buffer_status, 0, d->num_desc * sizeof(unsigned int));
+	memset(d->buffer_time, 0, d->num_desc * sizeof(struct timeval));
+	memset(d->last_used_cmd, 0, d->num_desc * sizeof(unsigned int));
+	memset(d->next_buffer, -1, d->num_desc * sizeof(int));
+
+        spin_lock_init(&d->lock);
+
+	PRINT(KERN_INFO, ohci->host->id, "Iso %s DMA: %d buffers "
+	      "of size %d allocated for a frame size %d, each with %d prgs",
+	      (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
+	      d->num_desc, d->buf_size, d->frame_size, d->nb_cmd);
+
+	return d;
+}
+
+static void reset_ir_status(struct dma_iso_ctx *d, int n)
+{
+	int i;
+	d->ir_prg[n][0].status = cpu_to_le32(4);
+	d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
+	for (i = 2; i < d->nb_cmd - 1; i++)
+		d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
+	d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
+}
+
+static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
+{
+	struct dma_cmd *ir_prg = d->ir_prg[n];
+	struct dma_prog_region *ir_reg = &d->prg_reg[n];
+	unsigned long buf = (unsigned long)d->dma.kvirt + n * d->buf_size;
+	int i;
+
+	/* the first descriptor will read only 4 bytes */
+	ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
+		DMA_CTL_BRANCH | 4);
+
+	/* set the sync flag */
+	if (flags & VIDEO1394_SYNC_FRAMES)
+		ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
+
+	ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
+				(unsigned long)d->dma.kvirt));
+	ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
+					1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
+
+	/* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
+	if (d->nb_cmd > 2) {
+		/* The second descriptor will read PAGE_SIZE-4 bytes */
+		ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
+						DMA_CTL_BRANCH | (PAGE_SIZE-4));
+		ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
+						(unsigned long)d->dma.kvirt));
+		ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
+						      2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
+
+		for (i = 2; i < d->nb_cmd - 1; i++) {
+			ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
+							DMA_CTL_BRANCH | PAGE_SIZE);
+			ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
+							(buf+(i-1)*PAGE_SIZE) -
+							(unsigned long)d->dma.kvirt));
+
+			ir_prg[i].branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
+					    (i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
+		}
+
+		/* The last descriptor will generate an interrupt */
+		ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
+						DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
+		ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
+						(buf+(i-1)*PAGE_SIZE) -
+						(unsigned long)d->dma.kvirt));
+	} else {
+		/* Only one DMA page is used. Read d->left_size immediately and */
+		/* generate an interrupt as this is also the last page. */
+		ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
+						DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
+		ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
+						(buf + 4) - (unsigned long)d->dma.kvirt));
+	}
+}
+
+static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
+{
+	struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
+	int i;
+
+	d->flags = flags;
+
+	ohci1394_stop_context(ohci, d->ctrlClear, NULL);
+
+	for (i=0;i<d->num_desc;i++) {
+		initialize_dma_ir_prg(d, i, flags);
+		reset_ir_status(d, i);
+	}
+
+	/* reset the ctrl register */
+	reg_write(ohci, d->ctrlClear, 0xf0000000);
+
+	/* Set bufferFill */
+	reg_write(ohci, d->ctrlSet, 0x80000000);
+
+	/* Set isoch header */
+	if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
+		reg_write(ohci, d->ctrlSet, 0x40000000);
+
+	/* Set the context match register to match on all tags,
+	   sync for sync tag, and listen to d->channel */
+	reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
+
+	/* Set up isoRecvIntMask to generate interrupts */
+	reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
+}
+
+/* find which context is listening to this channel */
+static struct dma_iso_ctx *
+find_ctx(struct list_head *list, int type, int channel)
+{
+	struct dma_iso_ctx *ctx;
+
+	list_for_each_entry(ctx, list, link) {
+		if (ctx->type == type && ctx->channel == channel)
+			return ctx;
+	}
+
+	return NULL;
+}
+
+static void wakeup_dma_ir_ctx(unsigned long l)
+{
+	struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
+	int i;
+
+	spin_lock(&d->lock);
+
+	for (i = 0; i < d->num_desc; i++) {
+		if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
+			reset_ir_status(d, i);
+			d->buffer_status[i] = VIDEO1394_BUFFER_READY;
+			do_gettimeofday(&d->buffer_time[i]);
+		}
+	}
+
+	spin_unlock(&d->lock);
+
+	if (waitqueue_active(&d->waitq))
+		wake_up_interruptible(&d->waitq);
+}
+
+static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
+				 int n)
+{
+	unsigned char* buf = d->dma.kvirt + n * d->buf_size;
+	u32 cycleTimer;
+	u32 timeStamp;
+
+	if (n == -1) {
+	  return;
+	}
+
+	cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+
+	timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
+	timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
+		+ (cycleTimer & 0xf000)) & 0xffff;
+
+	buf[6] = timeStamp >> 8;
+	buf[7] = timeStamp & 0xff;
+
+    /* if first packet is empty packet, then put timestamp into the next full one too */
+    if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
+   	    buf += d->packet_size;
+    	buf[6] = timeStamp >> 8;
+	    buf[7] = timeStamp & 0xff;
+	}
+
+    /* do the next buffer frame too in case of irq latency */
+	n = d->next_buffer[n];
+	if (n == -1) {
+	  return;
+	}
+	buf = d->dma.kvirt + n * d->buf_size;
+
+	timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
+
+	buf[6] = timeStamp >> 8;
+	buf[7] = timeStamp & 0xff;
+
+    /* if first packet is empty packet, then put timestamp into the next full one too */
+    if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
+   	    buf += d->packet_size;
+    	buf[6] = timeStamp >> 8;
+	    buf[7] = timeStamp & 0xff;
+	}
+
+#if 0
+	printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
+	       curr, n, cycleTimer, timeStamp);
+#endif
+}
+
+static void wakeup_dma_it_ctx(unsigned long l)
+{
+	struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
+	struct ti_ohci *ohci = d->ohci;
+	int i;
+
+	spin_lock(&d->lock);
+
+	for (i = 0; i < d->num_desc; i++) {
+		if (d->it_prg[i][d->last_used_cmd[i]].end.status &
+		    cpu_to_le32(0xFFFF0000)) {
+			int next = d->next_buffer[i];
+			put_timestamp(ohci, d, next);
+			d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
+			d->buffer_status[i] = VIDEO1394_BUFFER_READY;
+		}
+	}
+
+	spin_unlock(&d->lock);
+
+	if (waitqueue_active(&d->waitq))
+		wake_up_interruptible(&d->waitq);
+}
+
+static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
+{
+	struct it_dma_prg *it_prg = d->it_prg[n];
+	struct dma_prog_region *it_reg = &d->prg_reg[n];
+	unsigned long buf = (unsigned long)d->dma.kvirt + n * d->buf_size;
+	int i;
+	d->last_used_cmd[n] = d->nb_cmd - 1;
+	for (i=0;i<d->nb_cmd;i++) {
+
+		it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
+			DMA_CTL_IMMEDIATE | 8) ;
+		it_prg[i].begin.address = 0;
+
+		it_prg[i].begin.status = 0;
+
+		it_prg[i].data[0] = cpu_to_le32(
+			(IEEE1394_SPEED_100 << 16)
+			| (/* tag */ 1 << 14)
+			| (d->channel << 8)
+			| (TCODE_ISO_DATA << 4));
+		if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
+		it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
+		it_prg[i].data[2] = 0;
+		it_prg[i].data[3] = 0;
+
+		it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
+			    	    	     DMA_CTL_BRANCH);
+		it_prg[i].end.address =
+			cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
+						(unsigned long)d->dma.kvirt));
+
+		if (i<d->nb_cmd-1) {
+			it_prg[i].end.control |= cpu_to_le32(d->packet_size);
+			it_prg[i].begin.branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
+					sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
+			it_prg[i].end.branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
+					sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
+		} else {
+			/* the last prg generates an interrupt */
+			it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
+				DMA_CTL_IRQ | d->left_size);
+			/* the last prg doesn't branch */
+			it_prg[i].begin.branchAddress = 0;
+			it_prg[i].end.branchAddress = 0;
+		}
+		it_prg[i].end.status = 0;
+	}
+}
+
+static void initialize_dma_it_prg_var_packet_queue(
+	struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
+	struct ti_ohci *ohci)
+{
+	struct it_dma_prg *it_prg = d->it_prg[n];
+	struct dma_prog_region *it_reg = &d->prg_reg[n];
+	int i;
+
+#if 0
+	if (n != -1) {
+		put_timestamp(ohci, d, n);
+	}
+#endif
+	d->last_used_cmd[n] = d->nb_cmd - 1;
+
+	for (i = 0; i < d->nb_cmd; i++) {
+		unsigned int size;
+		if (packet_sizes[i] > d->packet_size) {
+			size = d->packet_size;
+		} else {
+			size = packet_sizes[i];
+		}
+		it_prg[i].data[1] = cpu_to_le32(size << 16);
+		it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
+
+		if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
+			it_prg[i].end.control |= cpu_to_le32(size);
+			it_prg[i].begin.branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
+					sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
+			it_prg[i].end.branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
+					sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
+		} else {
+			/* the last prg generates an interrupt */
+			it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
+				DMA_CTL_IRQ | size);
+			/* the last prg doesn't branch */
+			it_prg[i].begin.branchAddress = 0;
+			it_prg[i].end.branchAddress = 0;
+			d->last_used_cmd[n] = i;
+			break;
+		}
+	}
+}
+
+static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
+				  unsigned int syt_offset, int flags)
+{
+	struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
+	int i;
+
+	d->flags = flags;
+	d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
+
+	ohci1394_stop_context(ohci, d->ctrlClear, NULL);
+
+	for (i=0;i<d->num_desc;i++)
+		initialize_dma_it_prg(d, i, sync_tag);
+
+	/* Set up isoRecvIntMask to generate interrupts */
+	reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
+}
+
+static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
+					      unsigned int buffer)
+{
+	unsigned long flags;
+	unsigned int ret;
+	spin_lock_irqsave(&d->lock, flags);
+	ret = d->buffer_status[buffer];
+	spin_unlock_irqrestore(&d->lock, flags);
+	return ret;
+}
+
+static int __video1394_ioctl(struct file *file,
+			     unsigned int cmd, unsigned long arg)
+{
+	struct file_ctx *ctx = (struct file_ctx *)file->private_data;
+	struct ti_ohci *ohci = ctx->ohci;
+	unsigned long flags;
+	void __user *argp = (void __user *)arg;
+
+	switch(cmd)
+	{
+	case VIDEO1394_IOC_LISTEN_CHANNEL:
+	case VIDEO1394_IOC_TALK_CHANNEL:
+	{
+		struct video1394_mmap v;
+		u64 mask;
+		struct dma_iso_ctx *d;
+		int i;
+
+		if (copy_from_user(&v, argp, sizeof(v)))
+			return -EFAULT;
+
+		/* if channel < 0, find lowest available one */
+		if (v.channel < 0) {
+		    mask = (u64)0x1;
+		    for (i=0; ; i++) {
+			if (i == ISO_CHANNELS) {
+			    PRINT(KERN_ERR, ohci->host->id, 
+				  "No free channel found");
+			    return EAGAIN;
+			}
+			if (!(ohci->ISO_channel_usage & mask)) {
+			    v.channel = i;
+			    PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
+			    break;
+			}
+			mask = mask << 1;
+		    }
+		} else if (v.channel >= ISO_CHANNELS) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Iso channel %d out of bounds", v.channel);
+			return -EINVAL;
+		} else {
+			mask = (u64)0x1<<v.channel;
+		}
+		PRINT(KERN_INFO, ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
+			(u32)(mask>>32),(u32)(mask&0xffffffff),
+			(u32)(ohci->ISO_channel_usage>>32),
+			(u32)(ohci->ISO_channel_usage&0xffffffff));
+		if (ohci->ISO_channel_usage & mask) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Channel %d is already taken", v.channel);
+			return -EBUSY;
+		}
+
+		if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Invalid %d length buffer requested",v.buf_size);
+			return -EINVAL;
+		}
+
+		if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Invalid %d buffers requested",v.nb_buffers);
+			return -EINVAL;
+		}
+
+		if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "%d buffers of size %d bytes is too big",
+			      v.nb_buffers, v.buf_size);
+			return -EINVAL;
+		}
+
+		if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
+			d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
+					      v.nb_buffers, v.buf_size,
+					      v.channel, 0);
+
+			if (d == NULL) {
+				PRINT(KERN_ERR, ohci->host->id,
+				      "Couldn't allocate ir context");
+				return -EAGAIN;
+			}
+			initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
+
+			ctx->current_ctx = d;
+
+			v.buf_size = d->buf_size;
+			list_add_tail(&d->link, &ctx->context_list);
+
+			PRINT(KERN_INFO, ohci->host->id,
+			      "iso context %d listen on channel %d",
+			      d->ctx, v.channel);
+		}
+		else {
+			d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
+					      v.nb_buffers, v.buf_size,
+					      v.channel, v.packet_size);
+
+			if (d == NULL) {
+				PRINT(KERN_ERR, ohci->host->id,
+				      "Couldn't allocate it context");
+				return -EAGAIN;
+			}
+			initialize_dma_it_ctx(d, v.sync_tag,
+					      v.syt_offset, v.flags);
+
+			ctx->current_ctx = d;
+
+			v.buf_size = d->buf_size;
+
+			list_add_tail(&d->link, &ctx->context_list);
+
+			PRINT(KERN_INFO, ohci->host->id,
+			      "Iso context %d talk on channel %d", d->ctx,
+			      v.channel);
+		}
+
+		if (copy_to_user((void *)arg, &v, sizeof(v))) {
+			/* FIXME : free allocated dma resources */
+			return -EFAULT;
+		}
+		
+		ohci->ISO_channel_usage |= mask;
+
+		return 0;
+	}
+	case VIDEO1394_IOC_UNLISTEN_CHANNEL:
+	case VIDEO1394_IOC_UNTALK_CHANNEL:
+	{
+		int channel;
+		u64 mask;
+		struct dma_iso_ctx *d;
+
+		if (copy_from_user(&channel, argp, sizeof(int)))
+			return -EFAULT;
+
+		if (channel < 0 || channel >= ISO_CHANNELS) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Iso channel %d out of bound", channel);
+			return -EINVAL;
+		}
+		mask = (u64)0x1<<channel;
+		if (!(ohci->ISO_channel_usage & mask)) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Channel %d is not being used", channel);
+			return -ESRCH;
+		}
+
+		/* Mark this channel as unused */
+		ohci->ISO_channel_usage &= ~mask;
+
+		if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
+			d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
+		else
+			d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
+
+		if (d == NULL) return -ESRCH;
+		PRINT(KERN_INFO, ohci->host->id, "Iso context %d "
+		      "stop talking on channel %d", d->ctx, channel);
+		free_dma_iso_ctx(d);
+
+		return 0;
+	}
+	case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
+	{
+		struct video1394_wait v;
+		struct dma_iso_ctx *d;
+
+		if (copy_from_user(&v, argp, sizeof(v)))
+			return -EFAULT;
+
+		d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
+		if (d == NULL) return -EFAULT;
+
+		if ((v.buffer<0) || (v.buffer>d->num_desc)) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d out of range",v.buffer);
+			return -EINVAL;
+		}
+
+		spin_lock_irqsave(&d->lock,flags);
+
+		if (d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d is already used",v.buffer);
+			spin_unlock_irqrestore(&d->lock,flags);
+			return -EBUSY;
+		}
+
+		d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
+
+		if (d->last_buffer>=0)
+			d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
+				cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0)
+					& 0xfffffff0) | 0x1);
+
+		d->last_buffer = v.buffer;
+
+		d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress = 0;
+
+		spin_unlock_irqrestore(&d->lock,flags);
+
+		if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
+		{
+			DBGMSG(ohci->host->id, "Starting iso DMA ctx=%d",d->ctx);
+
+			/* Tell the controller where the first program is */
+			reg_write(ohci, d->cmdPtr,
+				dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0) | 0x1);
+
+			/* Run IR context */
+			reg_write(ohci, d->ctrlSet, 0x8000);
+		}
+		else {
+			/* Wake up dma context if necessary */
+			if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
+				PRINT(KERN_INFO, ohci->host->id,
+				      "Waking up iso dma ctx=%d", d->ctx);
+				reg_write(ohci, d->ctrlSet, 0x1000);
+			}
+		}
+		return 0;
+
+	}
+	case VIDEO1394_IOC_LISTEN_WAIT_BUFFER:
+	case VIDEO1394_IOC_LISTEN_POLL_BUFFER:
+	{
+		struct video1394_wait v;
+		struct dma_iso_ctx *d;
+		int i;
+
+		if (copy_from_user(&v, argp, sizeof(v)))
+			return -EFAULT;
+
+		d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
+		if (d == NULL) return -EFAULT;
+
+		if ((v.buffer<0) || (v.buffer>d->num_desc)) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d out of range",v.buffer);
+			return -EINVAL;
+		}
+
+		/*
+		 * I change the way it works so that it returns
+		 * the last received frame.
+		 */
+		spin_lock_irqsave(&d->lock, flags);
+		switch(d->buffer_status[v.buffer]) {
+		case VIDEO1394_BUFFER_READY:
+			d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
+			break;
+		case VIDEO1394_BUFFER_QUEUED:
+			if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
+			    /* for polling, return error code EINTR */
+			    spin_unlock_irqrestore(&d->lock, flags);
+			    return -EINTR;
+			}
+
+			spin_unlock_irqrestore(&d->lock, flags);
+			wait_event_interruptible(d->waitq,
+					video1394_buffer_state(d, v.buffer) ==
+					 VIDEO1394_BUFFER_READY);
+			if (signal_pending(current))
+                                return -EINTR;
+			spin_lock_irqsave(&d->lock, flags);
+			d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
+			break;
+		default:
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d is not queued",v.buffer);
+			spin_unlock_irqrestore(&d->lock, flags);
+			return -ESRCH;
+		}
+
+		/* set time of buffer */
+		v.filltime = d->buffer_time[v.buffer];
+//		printk("Buffer %d time %d\n", v.buffer, (d->buffer_time[v.buffer]).tv_usec);
+
+		/*
+		 * Look ahead to see how many more buffers have been received
+		 */
+		i=0;
+		while (d->buffer_status[(v.buffer+1)%d->num_desc]==
+		       VIDEO1394_BUFFER_READY) {
+			v.buffer=(v.buffer+1)%d->num_desc;
+			i++;
+		}
+		spin_unlock_irqrestore(&d->lock, flags);
+
+		v.buffer=i;
+		if (copy_to_user(argp, &v, sizeof(v)))
+			return -EFAULT;
+
+		return 0;
+	}
+	case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
+	{
+		struct video1394_wait v;
+		unsigned int *psizes = NULL;
+		struct dma_iso_ctx *d;
+
+		if (copy_from_user(&v, argp, sizeof(v)))
+			return -EFAULT;
+
+		d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
+		if (d == NULL) return -EFAULT;
+
+		if ((v.buffer<0) || (v.buffer>d->num_desc)) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d out of range",v.buffer);
+			return -EINVAL;
+		}
+
+		if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
+			int buf_size = d->nb_cmd * sizeof(unsigned int);
+			struct video1394_queue_variable __user *p = argp;
+			unsigned int __user *qv;
+
+			if (get_user(qv, &p->packet_sizes))
+				return -EFAULT;
+
+			psizes = kmalloc(buf_size, GFP_KERNEL);
+			if (!psizes)
+				return -ENOMEM;
+
+			if (copy_from_user(psizes, qv, buf_size)) {
+				kfree(psizes);
+				return -EFAULT;
+			}
+		}
+
+		spin_lock_irqsave(&d->lock,flags);
+
+		if (d->buffer_status[v.buffer]!=VIDEO1394_BUFFER_FREE) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d is already used",v.buffer);
+			spin_unlock_irqrestore(&d->lock,flags);
+			if (psizes)
+				kfree(psizes);
+			return -EBUSY;
+		}
+
+		if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
+			initialize_dma_it_prg_var_packet_queue(
+				d, v.buffer, psizes,
+				ohci);
+		}
+
+		d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
+
+		if (d->last_buffer >= 0) {
+			d->it_prg[d->last_buffer]
+				[ d->last_used_cmd[d->last_buffer] ].end.branchAddress =
+					cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer],
+						0) & 0xfffffff0) | 0x3);
+
+			d->it_prg[d->last_buffer]
+				[ d->last_used_cmd[d->last_buffer] ].begin.branchAddress =
+					cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer],
+						0) & 0xfffffff0) | 0x3);
+			d->next_buffer[d->last_buffer] = v.buffer;
+		}
+		d->last_buffer = v.buffer;
+		d->next_buffer[d->last_buffer] = -1;
+
+		d->it_prg[d->last_buffer][d->last_used_cmd[d->last_buffer]].end.branchAddress = 0;
+
+		spin_unlock_irqrestore(&d->lock,flags);
+
+		if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
+		{
+			DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
+			       d->ctx);
+			put_timestamp(ohci, d, d->last_buffer);
+
+			/* Tell the controller where the first program is */
+			reg_write(ohci, d->cmdPtr,
+				dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0) | 0x3);
+
+			/* Run IT context */
+			reg_write(ohci, d->ctrlSet, 0x8000);
+		}
+		else {
+			/* Wake up dma context if necessary */
+			if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
+				PRINT(KERN_INFO, ohci->host->id,
+				      "Waking up iso transmit dma ctx=%d",
+				      d->ctx);
+				put_timestamp(ohci, d, d->last_buffer);
+				reg_write(ohci, d->ctrlSet, 0x1000);
+			}
+		}
+
+		if (psizes)
+			kfree(psizes);
+
+		return 0;
+
+	}
+	case VIDEO1394_IOC_TALK_WAIT_BUFFER:
+	{
+		struct video1394_wait v;
+		struct dma_iso_ctx *d;
+
+		if (copy_from_user(&v, argp, sizeof(v)))
+			return -EFAULT;
+
+		d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
+		if (d == NULL) return -EFAULT;
+
+		if ((v.buffer<0) || (v.buffer>d->num_desc)) {
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d out of range",v.buffer);
+			return -EINVAL;
+		}
+
+		switch(d->buffer_status[v.buffer]) {
+		case VIDEO1394_BUFFER_READY:
+			d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
+			return 0;
+		case VIDEO1394_BUFFER_QUEUED:
+			wait_event_interruptible(d->waitq,
+					(d->buffer_status[v.buffer] == VIDEO1394_BUFFER_READY));
+			if (signal_pending(current))
+				return -EINTR;
+			d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
+			return 0;
+		default:
+			PRINT(KERN_ERR, ohci->host->id,
+			      "Buffer %d is not queued",v.buffer);
+			return -ESRCH;
+		}
+	}
+	default:
+		return -ENOTTY;
+	}
+}
+
+static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int err;
+	lock_kernel();
+	err = __video1394_ioctl(file, cmd, arg);
+	unlock_kernel();
+	return err;
+}
+
+/*
+ *	This maps the vmalloced and reserved buffer to user space.
+ *
+ *  FIXME:
+ *  - PAGE_READONLY should suffice!?
+ *  - remap_pfn_range is kind of inefficient for page by page remapping.
+ *    But e.g. pte_alloc() does not work in modules ... :-(
+ */
+
+static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct file_ctx *ctx = (struct file_ctx *)file->private_data;
+	int res = -EINVAL;
+
+	lock_kernel();
+	if (ctx->current_ctx == NULL) {
+		PRINT(KERN_ERR, ctx->ohci->host->id, "Current iso context not set");
+	} else
+		res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
+	unlock_kernel();
+
+	return res;
+}
+
+static int video1394_open(struct inode *inode, struct file *file)
+{
+	int i = ieee1394_file_to_instance(file);
+	struct ti_ohci *ohci;
+	struct file_ctx *ctx;
+
+	ohci = hpsb_get_hostinfo_bykey(&video1394_highlevel, i);
+        if (ohci == NULL)
+                return -EIO;
+
+	ctx = kmalloc(sizeof(struct file_ctx), GFP_KERNEL);
+	if (ctx == NULL)  {
+		PRINT(KERN_ERR, ohci->host->id, "Cannot malloc file_ctx");
+		return -ENOMEM;
+	}
+
+	memset(ctx, 0, sizeof(struct file_ctx));
+	ctx->ohci = ohci;
+	INIT_LIST_HEAD(&ctx->context_list);
+	ctx->current_ctx = NULL;
+	file->private_data = ctx;
+
+	return 0;
+}
+
+static int video1394_release(struct inode *inode, struct file *file)
+{
+	struct file_ctx *ctx = (struct file_ctx *)file->private_data;
+	struct ti_ohci *ohci = ctx->ohci;
+	struct list_head *lh, *next;
+	u64 mask;
+
+	lock_kernel();
+	list_for_each_safe(lh, next, &ctx->context_list) {
+		struct dma_iso_ctx *d;
+		d = list_entry(lh, struct dma_iso_ctx, link);
+		mask = (u64) 1 << d->channel;
+
+		if (!(ohci->ISO_channel_usage & mask))
+			PRINT(KERN_ERR, ohci->host->id, "On release: Channel %d "
+			      "is not being used", d->channel);
+		else
+			ohci->ISO_channel_usage &= ~mask;
+		PRINT(KERN_INFO, ohci->host->id, "On release: Iso %s context "
+		      "%d stop listening on channel %d",
+		      d->type == OHCI_ISO_RECEIVE ? "receive" : "transmit",
+		      d->ctx, d->channel);
+		free_dma_iso_ctx(d);
+	}
+
+	kfree(ctx);
+	file->private_data = NULL;
+
+	unlock_kernel();
+	return 0;
+}
+
+#ifdef CONFIG_COMPAT
+static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
+#endif
+
+static struct cdev video1394_cdev;
+static struct file_operations video1394_fops=
+{
+	.owner =	THIS_MODULE,
+	.unlocked_ioctl = video1394_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = video1394_compat_ioctl,
+#endif
+	.mmap =		video1394_mmap,
+	.open =		video1394_open,
+	.release =	video1394_release
+};
+
+/*** HOTPLUG STUFF **********************************************************/
+/*
+ * Export information about protocols/devices supported by this driver.
+ */
+static struct ieee1394_device_id video1394_id_table[] = {
+	{
+		.match_flags	= IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
+		.specifier_id	= CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
+		.version	= CAMERA_SW_VERSION_ENTRY & 0xffffff
+	},
+        {
+                .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
+                .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
+                .version        = (CAMERA_SW_VERSION_ENTRY + 1) & 0xffffff
+        },
+        {
+                .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
+                .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
+                .version        = (CAMERA_SW_VERSION_ENTRY + 2) & 0xffffff
+        },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(ieee1394, video1394_id_table);
+
+static struct hpsb_protocol_driver video1394_driver = {
+	.name		= "1394 Digital Camera Driver",
+	.id_table	= video1394_id_table,
+	.driver		= {
+		.name	= VIDEO1394_DRIVER_NAME,
+		.bus	= &ieee1394_bus_type,
+	},
+};
+
+
+static void video1394_add_host (struct hpsb_host *host)
+{
+	struct ti_ohci *ohci;
+	int minor;
+
+	/* We only work with the OHCI-1394 driver */
+	if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
+		return;
+
+	ohci = (struct ti_ohci *)host->hostdata;
+
+	if (!hpsb_create_hostinfo(&video1394_highlevel, host, 0)) {
+		PRINT(KERN_ERR, ohci->host->id, "Cannot allocate hostinfo");
+		return;
+	}
+
+	hpsb_set_hostinfo(&video1394_highlevel, host, ohci);
+	hpsb_set_hostinfo_key(&video1394_highlevel, host, ohci->host->id);
+
+	minor = IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id;
+	class_simple_device_add(hpsb_protocol_class, MKDEV(
+		IEEE1394_MAJOR,	minor), 
+		NULL, "%s-%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
+	devfs_mk_cdev(MKDEV(IEEE1394_MAJOR, minor),
+		       S_IFCHR | S_IRUSR | S_IWUSR,
+		       "%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
+}
+
+
+static void video1394_remove_host (struct hpsb_host *host)
+{
+	struct ti_ohci *ohci = hpsb_get_hostinfo(&video1394_highlevel, host);
+
+	if (ohci) {
+		class_simple_device_remove(MKDEV(IEEE1394_MAJOR, 
+			IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id));
+		devfs_remove("%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
+	}
+	
+	return;
+}
+
+
+static struct hpsb_highlevel video1394_highlevel = {
+	.name =		VIDEO1394_DRIVER_NAME,
+	.add_host =	video1394_add_host,
+	.remove_host =	video1394_remove_host,
+};
+
+MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
+MODULE_DESCRIPTION("driver for digital video on OHCI board");
+MODULE_SUPPORTED_DEVICE(VIDEO1394_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_COMPAT
+
+#define VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER     \
+	_IOW ('#', 0x12, struct video1394_wait32)
+#define VIDEO1394_IOC32_LISTEN_WAIT_BUFFER      \
+	_IOWR('#', 0x13, struct video1394_wait32)
+#define VIDEO1394_IOC32_TALK_WAIT_BUFFER        \
+	_IOW ('#', 0x17, struct video1394_wait32)
+#define VIDEO1394_IOC32_LISTEN_POLL_BUFFER      \
+	_IOWR('#', 0x18, struct video1394_wait32)
+
+struct video1394_wait32 {
+	u32 channel;
+	u32 buffer;
+	struct compat_timeval filltime;
+};
+
+static int video1394_wr_wait32(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct video1394_wait32 __user *argp = (void __user *)arg;
+        struct video1394_wait32 wait32;
+        struct video1394_wait wait;
+        mm_segment_t old_fs;
+        int ret;
+
+        if (copy_from_user(&wait32, argp, sizeof(wait32)))
+                return -EFAULT;
+
+        wait.channel = wait32.channel;
+        wait.buffer = wait32.buffer;
+        wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
+        wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
+
+        old_fs = get_fs();
+        set_fs(KERNEL_DS);
+        if (cmd == VIDEO1394_IOC32_LISTEN_WAIT_BUFFER)
+		ret = video1394_ioctl(file,
+				      VIDEO1394_IOC_LISTEN_WAIT_BUFFER,
+				      (unsigned long) &wait);
+        else
+		ret = video1394_ioctl(file,
+				      VIDEO1394_IOC_LISTEN_POLL_BUFFER,
+				      (unsigned long) &wait);
+        set_fs(old_fs);
+
+        if (!ret) {
+                wait32.channel = wait.channel;
+                wait32.buffer = wait.buffer;
+                wait32.filltime.tv_sec = (int)wait.filltime.tv_sec;
+                wait32.filltime.tv_usec = (int)wait.filltime.tv_usec;
+
+                if (copy_to_user(argp, &wait32, sizeof(wait32)))
+                        ret = -EFAULT;
+        }
+
+        return ret;
+}
+
+static int video1394_w_wait32(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct video1394_wait32 wait32;
+        struct video1394_wait wait;
+        mm_segment_t old_fs;
+        int ret;
+
+        if (copy_from_user(&wait32, (void __user *)arg, sizeof(wait32)))
+                return -EFAULT;
+
+        wait.channel = wait32.channel;
+        wait.buffer = wait32.buffer;
+        wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
+        wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
+
+        old_fs = get_fs();
+        set_fs(KERNEL_DS);
+        if (cmd == VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER)
+		ret = video1394_ioctl(file,
+				      VIDEO1394_IOC_LISTEN_QUEUE_BUFFER,
+				      (unsigned long) &wait);
+        else
+		ret = video1394_ioctl(file,
+				      VIDEO1394_IOC_TALK_WAIT_BUFFER,
+				      (unsigned long) &wait);
+        set_fs(old_fs);
+
+        return ret;
+}
+
+static int video1394_queue_buf32(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        return -EFAULT;   /* ??? was there before. */
+
+	return video1394_ioctl(file,
+				VIDEO1394_IOC_TALK_QUEUE_BUFFER, arg);
+}
+
+static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case VIDEO1394_IOC_LISTEN_CHANNEL:
+	case VIDEO1394_IOC_UNLISTEN_CHANNEL:
+	case VIDEO1394_IOC_TALK_CHANNEL:
+	case VIDEO1394_IOC_UNTALK_CHANNEL:
+		return video1394_ioctl(f, cmd, arg);
+
+	case VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER:
+		return video1394_w_wait32(f, cmd, arg);
+	case VIDEO1394_IOC32_LISTEN_WAIT_BUFFER:
+		return video1394_wr_wait32(f, cmd, arg);
+	case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
+		return video1394_queue_buf32(f, cmd, arg);
+	case VIDEO1394_IOC32_TALK_WAIT_BUFFER:
+		return video1394_w_wait32(f, cmd, arg);
+	case VIDEO1394_IOC32_LISTEN_POLL_BUFFER:
+		return video1394_wr_wait32(f, cmd, arg);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+#endif /* CONFIG_COMPAT */
+
+static void __exit video1394_exit_module (void)
+{
+	hpsb_unregister_protocol(&video1394_driver);
+
+	hpsb_unregister_highlevel(&video1394_highlevel);
+
+	devfs_remove(VIDEO1394_DRIVER_NAME);
+	cdev_del(&video1394_cdev);
+
+	PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
+}
+
+static int __init video1394_init_module (void)
+{
+	int ret;
+
+	cdev_init(&video1394_cdev, &video1394_fops);
+	video1394_cdev.owner = THIS_MODULE;
+	kobject_set_name(&video1394_cdev.kobj, VIDEO1394_DRIVER_NAME);
+	ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);
+	if (ret) {
+		PRINT_G(KERN_ERR, "video1394: unable to get minor device block");
+		return ret;
+        }
+
+	devfs_mk_dir(VIDEO1394_DRIVER_NAME);
+
+	hpsb_register_highlevel(&video1394_highlevel);
+
+	ret = hpsb_register_protocol(&video1394_driver);
+	if (ret) {
+		PRINT_G(KERN_ERR, "video1394: failed to register protocol");
+		hpsb_unregister_highlevel(&video1394_highlevel);
+		devfs_remove(VIDEO1394_DRIVER_NAME);
+		cdev_del(&video1394_cdev);
+		return ret;
+	}
+
+	PRINT_G(KERN_INFO, "Installed " VIDEO1394_DRIVER_NAME " module");
+	return 0;
+}
+
+
+module_init(video1394_init_module);
+module_exit(video1394_exit_module);
+MODULE_ALIAS_CHARDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_VIDEO1394 * 16);