ieee1394: remove the old IEEE 1394 driver stack

The drivers
  - ohci1394 (controller driver)
  - ieee1394 (core)
  - dv1394, raw1394, video1394 (userspace ABI)
  - eth1394, sbp2 (protocol drivers)
are replaced by
  - firewire-ohci (controller driver)
  - firewire-core (core and userspace ABI)
  - firewire-net, firewire-sbp2 (protocol drivers)
which are more featureful, better performing, and more secure than the older
drivers; all with a smaller and more modern code base.

The driver firedtv in drivers/media/dvb/firewire/ contains backends to both
ieee1394 and firewire-core.  Its ieee1394 backend code can be removed in an
independent commit; firedtv as-is builds and works fine without ieee1394.

The driver pcilynx (an incomplete controller driver) is deleted without
replacement since PCILynx cards are extremely rare.  Owners of these cards
use them with the stand-alone bus sniffer driver nosy instead.

The drivers nosy and init_ohci1394_dma which do not interact with either of
the two IEEE 1394 stacks are not affected by the ieee1394 subsystem removal.

There are still some issues with the newer firewire subsystem compared to
the older one:
  - The rare and quirky controllers ALi M52xx, Apple UniNorth v1, NVIDIA
    NForce2 are even less well supported by firewire-ohci than by ohci1394.
    I am looking into the M52xx issue.
  - The experimental firewire-net is reportedly less stable than its
    experimental cousin eth1394.
  - Audio playback of a certain group of audio devices (ones based on DICE
    chipset with EAP; supported by prerelease FFADO code) does not work yet.
    This issue is still under investigation.
  - There were some ieee1394 based out-of-the-mainline drivers.  Of them,
    only lisight, an audio driver for iSight webcams, seems still useful.
    Work is underway to reimplement it on top of firewire-core.

All these remainig issues are minor; they should not stand in the way of
overall better user experience of IEEE 1394 on Linux, together with a
reduction in support efforts and maintenance burden.  The coexistence of two
IEEE 1394 kernel driver stacks in the mainline since 2.6.22 shall end now,
as announced earlier this year.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 0 insertions, 568 deletions

diff --git a/drivers/ieee1394/iso.c b/drivers/ieee1394/iso.c
deleted file mode 100644
index 1cf6487b65b..00000000000
--- a/drivers/ieee1394/iso.c
+++ /dev/null
@@ -1,568 +0,0 @@
-/*
- * IEEE 1394 for Linux
- *
- * kernel ISO transmission/reception
- *
- * Copyright (C) 2002 Maas Digital LLC
- *
- * This code is licensed under the GPL.  See the file COPYING in the root
- * directory of the kernel sources for details.
- */
-
-#include <linux/pci.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-
-#include "hosts.h"
-#include "iso.h"
-
-/**
- * hpsb_iso_stop - stop DMA
- */
-void hpsb_iso_stop(struct hpsb_iso *iso)
-{
-	if (!(iso->flags & HPSB_ISO_DRIVER_STARTED))
-		return;
-
-	iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ?
-				  XMIT_STOP : RECV_STOP, 0);
-	iso->flags &= ~HPSB_ISO_DRIVER_STARTED;
-}
-
-/**
- * hpsb_iso_shutdown - deallocate buffer and DMA context
- */
-void hpsb_iso_shutdown(struct hpsb_iso *iso)
-{
-	if (iso->flags & HPSB_ISO_DRIVER_INIT) {
-		hpsb_iso_stop(iso);
-		iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ?
-					  XMIT_SHUTDOWN : RECV_SHUTDOWN, 0);
-		iso->flags &= ~HPSB_ISO_DRIVER_INIT;
-	}
-
-	dma_region_free(&iso->data_buf);
-	kfree(iso);
-}
-
-static struct hpsb_iso *hpsb_iso_common_init(struct hpsb_host *host,
-					     enum hpsb_iso_type type,
-					     unsigned int data_buf_size,
-					     unsigned int buf_packets,
-					     int channel, int dma_mode,
-					     int irq_interval,
-					     void (*callback) (struct hpsb_iso
-							       *))
-{
-	struct hpsb_iso *iso;
-	int dma_direction;
-
-	/* make sure driver supports the ISO API */
-	if (!host->driver->isoctl) {
-		printk(KERN_INFO
-		       "ieee1394: host driver '%s' does not support the rawiso API\n",
-		       host->driver->name);
-		return NULL;
-	}
-
-	/* sanitize parameters */
-
-	if (buf_packets < 2)
-		buf_packets = 2;
-
-	if ((dma_mode < HPSB_ISO_DMA_DEFAULT)
-	    || (dma_mode > HPSB_ISO_DMA_PACKET_PER_BUFFER))
-		dma_mode = HPSB_ISO_DMA_DEFAULT;
-
-	if ((irq_interval < 0) || (irq_interval > buf_packets / 4))
-		irq_interval = buf_packets / 4;
-	if (irq_interval == 0)	/* really interrupt for each packet */
-		irq_interval = 1;
-
-	if (channel < -1 || channel >= 64)
-		return NULL;
-
-	/* channel = -1 is OK for multi-channel recv but not for xmit */
-	if (type == HPSB_ISO_XMIT && channel < 0)
-		return NULL;
-
-	/* allocate and write the struct hpsb_iso */
-
-	iso =
-	    kmalloc(sizeof(*iso) +
-		    buf_packets * sizeof(struct hpsb_iso_packet_info),
-		    GFP_KERNEL);
-	if (!iso)
-		return NULL;
-
-	iso->infos = (struct hpsb_iso_packet_info *)(iso + 1);
-
-	iso->type = type;
-	iso->host = host;
-	iso->hostdata = NULL;
-	iso->callback = callback;
-	init_waitqueue_head(&iso->waitq);
-	iso->channel = channel;
-	iso->irq_interval = irq_interval;
-	iso->dma_mode = dma_mode;
-	dma_region_init(&iso->data_buf);
-	iso->buf_size = PAGE_ALIGN(data_buf_size);
-	iso->buf_packets = buf_packets;
-	iso->pkt_dma = 0;
-	iso->first_packet = 0;
-	spin_lock_init(&iso->lock);
-
-	if (iso->type == HPSB_ISO_XMIT) {
-		iso->n_ready_packets = iso->buf_packets;
-		dma_direction = PCI_DMA_TODEVICE;
-	} else {
-		iso->n_ready_packets = 0;
-		dma_direction = PCI_DMA_FROMDEVICE;
-	}
-
-	atomic_set(&iso->overflows, 0);
-	iso->bytes_discarded = 0;
-	iso->flags = 0;
-	iso->prebuffer = 0;
-
-	/* allocate the packet buffer */
-	if (dma_region_alloc
-	    (&iso->data_buf, iso->buf_size, host->pdev, dma_direction))
-		goto err;
-
-	return iso;
-
-      err:
-	hpsb_iso_shutdown(iso);
-	return NULL;
-}
-
-/**
- * hpsb_iso_n_ready - returns number of packets ready to send or receive
- */
-int hpsb_iso_n_ready(struct hpsb_iso *iso)
-{
-	unsigned long flags;
-	int val;
-
-	spin_lock_irqsave(&iso->lock, flags);
-	val = iso->n_ready_packets;
-	spin_unlock_irqrestore(&iso->lock, flags);
-
-	return val;
-}
-
-/**
- * hpsb_iso_xmit_init - allocate the buffer and DMA context
- */
-struct hpsb_iso *hpsb_iso_xmit_init(struct hpsb_host *host,
-				    unsigned int data_buf_size,
-				    unsigned int buf_packets,
-				    int channel,
-				    int speed,
-				    int irq_interval,
-				    void (*callback) (struct hpsb_iso *))
-{
-	struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_XMIT,
-						    data_buf_size, buf_packets,
-						    channel,
-						    HPSB_ISO_DMA_DEFAULT,
-						    irq_interval, callback);
-	if (!iso)
-		return NULL;
-
-	iso->speed = speed;
-
-	/* tell the driver to start working */
-	if (host->driver->isoctl(iso, XMIT_INIT, 0))
-		goto err;
-
-	iso->flags |= HPSB_ISO_DRIVER_INIT;
-	return iso;
-
-      err:
-	hpsb_iso_shutdown(iso);
-	return NULL;
-}
-
-/**
- * hpsb_iso_recv_init - allocate the buffer and DMA context
- *
- * Note, if channel = -1, multi-channel receive is enabled.
- */
-struct hpsb_iso *hpsb_iso_recv_init(struct hpsb_host *host,
-				    unsigned int data_buf_size,
-				    unsigned int buf_packets,
-				    int channel,
-				    int dma_mode,
-				    int irq_interval,
-				    void (*callback) (struct hpsb_iso *))
-{
-	struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_RECV,
-						    data_buf_size, buf_packets,
-						    channel, dma_mode,
-						    irq_interval, callback);
-	if (!iso)
-		return NULL;
-
-	/* tell the driver to start working */
-	if (host->driver->isoctl(iso, RECV_INIT, 0))
-		goto err;
-
-	iso->flags |= HPSB_ISO_DRIVER_INIT;
-	return iso;
-
-      err:
-	hpsb_iso_shutdown(iso);
-	return NULL;
-}
-
-/**
- * hpsb_iso_recv_listen_channel
- *
- * multi-channel only
- */
-int hpsb_iso_recv_listen_channel(struct hpsb_iso *iso, unsigned char channel)
-{
-	if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64)
-		return -EINVAL;
-	return iso->host->driver->isoctl(iso, RECV_LISTEN_CHANNEL, channel);
-}
-
-/**
- * hpsb_iso_recv_unlisten_channel
- *
- * multi-channel only
- */
-int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel)
-{
-	if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64)
-		return -EINVAL;
-	return iso->host->driver->isoctl(iso, RECV_UNLISTEN_CHANNEL, channel);
-}
-
-/**
- * hpsb_iso_recv_set_channel_mask
- *
- * multi-channel only
- */
-int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask)
-{
-	if (iso->type != HPSB_ISO_RECV || iso->channel != -1)
-		return -EINVAL;
-	return iso->host->driver->isoctl(iso, RECV_SET_CHANNEL_MASK,
-					 (unsigned long)&mask);
-}
-
-/**
- * hpsb_iso_recv_flush - check for arrival of new packets
- *
- * check for arrival of new packets immediately (even if irq_interval
- * has not yet been reached)
- */
-int hpsb_iso_recv_flush(struct hpsb_iso *iso)
-{
-	if (iso->type != HPSB_ISO_RECV)
-		return -EINVAL;
-	return iso->host->driver->isoctl(iso, RECV_FLUSH, 0);
-}
-
-static int do_iso_xmit_start(struct hpsb_iso *iso, int cycle)
-{
-	int retval = iso->host->driver->isoctl(iso, XMIT_START, cycle);
-	if (retval)
-		return retval;
-
-	iso->flags |= HPSB_ISO_DRIVER_STARTED;
-	return retval;
-}
-
-/**
- * hpsb_iso_xmit_start - start DMA
- */
-int hpsb_iso_xmit_start(struct hpsb_iso *iso, int cycle, int prebuffer)
-{
-	if (iso->type != HPSB_ISO_XMIT)
-		return -1;
-
-	if (iso->flags & HPSB_ISO_DRIVER_STARTED)
-		return 0;
-
-	if (cycle < -1)
-		cycle = -1;
-	else if (cycle >= 8000)
-		cycle %= 8000;
-
-	iso->xmit_cycle = cycle;
-
-	if (prebuffer < 0)
-		prebuffer = iso->buf_packets - 1;
-	else if (prebuffer == 0)
-		prebuffer = 1;
-
-	if (prebuffer >= iso->buf_packets)
-		prebuffer = iso->buf_packets - 1;
-
-	iso->prebuffer = prebuffer;
-
-	/* remember the starting cycle; DMA will commence from xmit_queue_packets()
-	   once enough packets have been buffered */
-	iso->start_cycle = cycle;
-
-	return 0;
-}
-
-/**
- * hpsb_iso_recv_start - start DMA
- */
-int hpsb_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync)
-{
-	int retval = 0;
-	int isoctl_args[3];
-
-	if (iso->type != HPSB_ISO_RECV)
-		return -1;
-
-	if (iso->flags & HPSB_ISO_DRIVER_STARTED)
-		return 0;
-
-	if (cycle < -1)
-		cycle = -1;
-	else if (cycle >= 8000)
-		cycle %= 8000;
-
-	isoctl_args[0] = cycle;
-
-	if (tag_mask < 0)
-		/* match all tags */
-		tag_mask = 0xF;
-	isoctl_args[1] = tag_mask;
-
-	isoctl_args[2] = sync;
-
-	retval =
-	    iso->host->driver->isoctl(iso, RECV_START,
-				      (unsigned long)&isoctl_args[0]);
-	if (retval)
-		return retval;
-
-	iso->flags |= HPSB_ISO_DRIVER_STARTED;
-	return retval;
-}
-
-/* check to make sure the user has not supplied bogus values of offset/len
- * that would cause the kernel to access memory outside the buffer */
-static int hpsb_iso_check_offset_len(struct hpsb_iso *iso,
-				     unsigned int offset, unsigned short len,
-				     unsigned int *out_offset,
-				     unsigned short *out_len)
-{
-	if (offset >= iso->buf_size)
-		return -EFAULT;
-
-	/* make sure the packet does not go beyond the end of the buffer */
-	if (offset + len > iso->buf_size)
-		return -EFAULT;
-
-	/* check for wrap-around */
-	if (offset + len < offset)
-		return -EFAULT;
-
-	/* now we can trust 'offset' and 'length' */
-	*out_offset = offset;
-	*out_len = len;
-
-	return 0;
-}
-
-/**
- * hpsb_iso_xmit_queue_packet - queue a packet for transmission.
- *
- * @offset is relative to the beginning of the DMA buffer, where the packet's
- * data payload should already have been placed.
- */
-int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len,
-			       u8 tag, u8 sy)
-{
-	struct hpsb_iso_packet_info *info;
-	unsigned long flags;
-	int rv;
-
-	if (iso->type != HPSB_ISO_XMIT)
-		return -EINVAL;
-
-	/* is there space in the buffer? */
-	if (iso->n_ready_packets <= 0) {
-		return -EBUSY;
-	}
-
-	info = &iso->infos[iso->first_packet];
-
-	/* check for bogus offset/length */
-	if (hpsb_iso_check_offset_len
-	    (iso, offset, len, &info->offset, &info->len))
-		return -EFAULT;
-
-	info->tag = tag;
-	info->sy = sy;
-
-	spin_lock_irqsave(&iso->lock, flags);
-
-	rv = iso->host->driver->isoctl(iso, XMIT_QUEUE, (unsigned long)info);
-	if (rv)
-		goto out;
-
-	/* increment cursors */
-	iso->first_packet = (iso->first_packet + 1) % iso->buf_packets;
-	iso->xmit_cycle = (iso->xmit_cycle + 1) % 8000;
-	iso->n_ready_packets--;
-
-	if (iso->prebuffer != 0) {
-		iso->prebuffer--;
-		if (iso->prebuffer <= 0) {
-			iso->prebuffer = 0;
-			rv = do_iso_xmit_start(iso, iso->start_cycle);
-		}
-	}
-
-      out:
-	spin_unlock_irqrestore(&iso->lock, flags);
-	return rv;
-}
-
-/**
- * hpsb_iso_xmit_sync - wait until all queued packets have been transmitted
- */
-int hpsb_iso_xmit_sync(struct hpsb_iso *iso)
-{
-	if (iso->type != HPSB_ISO_XMIT)
-		return -EINVAL;
-
-	return wait_event_interruptible(iso->waitq,
-					hpsb_iso_n_ready(iso) ==
-					iso->buf_packets);
-}
-
-/**
- * hpsb_iso_packet_sent
- *
- * Available to low-level drivers.
- *
- * Call after a packet has been transmitted to the bus (interrupt context is
- * OK).  @cycle is the _exact_ cycle the packet was sent on.  @error should be
- * non-zero if some sort of error occurred when sending the packet.
- */
-void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&iso->lock, flags);
-
-	/* predict the cycle of the next packet to be queued */
-
-	/* jump ahead by the number of packets that are already buffered */
-	cycle += iso->buf_packets - iso->n_ready_packets;
-	cycle %= 8000;
-
-	iso->xmit_cycle = cycle;
-	iso->n_ready_packets++;
-	iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets;
-
-	if (iso->n_ready_packets == iso->buf_packets || error != 0) {
-		/* the buffer has run empty! */
-		atomic_inc(&iso->overflows);
-	}
-
-	spin_unlock_irqrestore(&iso->lock, flags);
-}
-
-/**
- * hpsb_iso_packet_received
- *
- * Available to low-level drivers.
- *
- * Call after a packet has been received (interrupt context is OK).
- */
-void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len,
-			      u16 total_len, u16 cycle, u8 channel, u8 tag,
-			      u8 sy)
-{
-	unsigned long flags;
-	spin_lock_irqsave(&iso->lock, flags);
-
-	if (iso->n_ready_packets == iso->buf_packets) {
-		/* overflow! */
-		atomic_inc(&iso->overflows);
-		/* Record size of this discarded packet */
-		iso->bytes_discarded += total_len;
-	} else {
-		struct hpsb_iso_packet_info *info = &iso->infos[iso->pkt_dma];
-		info->offset = offset;
-		info->len = len;
-		info->total_len = total_len;
-		info->cycle = cycle;
-		info->channel = channel;
-		info->tag = tag;
-		info->sy = sy;
-
-		iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets;
-		iso->n_ready_packets++;
-	}
-
-	spin_unlock_irqrestore(&iso->lock, flags);
-}
-
-/**
- * hpsb_iso_recv_release_packets - release packets, reuse buffer
- *
- * @n_packets have been read out of the buffer, re-use the buffer space
- */
-int hpsb_iso_recv_release_packets(struct hpsb_iso *iso, unsigned int n_packets)
-{
-	unsigned long flags;
-	unsigned int i;
-	int rv = 0;
-
-	if (iso->type != HPSB_ISO_RECV)
-		return -1;
-
-	spin_lock_irqsave(&iso->lock, flags);
-	for (i = 0; i < n_packets; i++) {
-		rv = iso->host->driver->isoctl(iso, RECV_RELEASE,
-					       (unsigned long)&iso->infos[iso->
-									  first_packet]);
-		if (rv)
-			break;
-
-		iso->first_packet = (iso->first_packet + 1) % iso->buf_packets;
-		iso->n_ready_packets--;
-
-		/* release memory from packets discarded when queue was full  */
-		if (iso->n_ready_packets == 0) {	/* Release only after all prior packets handled */
-			if (iso->bytes_discarded != 0) {
-				struct hpsb_iso_packet_info inf;
-				inf.total_len = iso->bytes_discarded;
-				iso->host->driver->isoctl(iso, RECV_RELEASE,
-							  (unsigned long)&inf);
-				iso->bytes_discarded = 0;
-			}
-		}
-	}
-	spin_unlock_irqrestore(&iso->lock, flags);
-	return rv;
-}
-
-/**
- * hpsb_iso_wake
- *
- * Available to low-level drivers.
- *
- * Call to wake waiting processes after buffer space has opened up.
- */
-void hpsb_iso_wake(struct hpsb_iso *iso)
-{
-	wake_up_interruptible(&iso->waitq);
-
-	if (iso->callback)
-		iso->callback(iso);
-}