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, 289 deletions

diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
deleted file mode 100644
index d178699..0000000
--- a/drivers/ieee1394/dma.c
+++ /dev/null
@@ -1,289 +0,0 @@
-/*
- * DMA region bookkeeping routines
- *
- * 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/mm.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/vmalloc.h>
-#include <linux/scatterlist.h>
-
-#include "dma.h"
-
-/* dma_prog_region */
-
-void dma_prog_region_init(struct dma_prog_region *prog)
-{
-	prog->kvirt = NULL;
-	prog->dev = NULL;
-	prog->n_pages = 0;
-	prog->bus_addr = 0;
-}
-
-int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
-			  struct pci_dev *dev)
-{
-	/* round up to page size */
-	n_bytes = PAGE_ALIGN(n_bytes);
-
-	prog->n_pages = n_bytes >> PAGE_SHIFT;
-
-	prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr);
-	if (!prog->kvirt) {
-		printk(KERN_ERR
-		       "dma_prog_region_alloc: pci_alloc_consistent() failed\n");
-		dma_prog_region_free(prog);
-		return -ENOMEM;
-	}
-
-	prog->dev = dev;
-
-	return 0;
-}
-
-void dma_prog_region_free(struct dma_prog_region *prog)
-{
-	if (prog->kvirt) {
-		pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT,
-				    prog->kvirt, prog->bus_addr);
-	}
-
-	prog->kvirt = NULL;
-	prog->dev = NULL;
-	prog->n_pages = 0;
-	prog->bus_addr = 0;
-}
-
-/* dma_region */
-
-/**
- * dma_region_init - clear out all fields but do not allocate anything
- */
-void dma_region_init(struct dma_region *dma)
-{
-	dma->kvirt = NULL;
-	dma->dev = NULL;
-	dma->n_pages = 0;
-	dma->n_dma_pages = 0;
-	dma->sglist = NULL;
-}
-
-/**
- * dma_region_alloc - allocate the buffer and map it to the IOMMU
- */
-int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
-		     struct pci_dev *dev, int direction)
-{
-	unsigned int i;
-
-	/* round up to page size */
-	n_bytes = PAGE_ALIGN(n_bytes);
-
-	dma->n_pages = n_bytes >> PAGE_SHIFT;
-
-	dma->kvirt = vmalloc_32(n_bytes);
-	if (!dma->kvirt) {
-		printk(KERN_ERR "dma_region_alloc: vmalloc_32() failed\n");
-		goto err;
-	}
-
-	/* Clear the ram out, no junk to the user */
-	memset(dma->kvirt, 0, n_bytes);
-
-	/* allocate scatter/gather list */
-	dma->sglist = vmalloc(dma->n_pages * sizeof(*dma->sglist));
-	if (!dma->sglist) {
-		printk(KERN_ERR "dma_region_alloc: vmalloc(sglist) failed\n");
-		goto err;
-	}
-
-	sg_init_table(dma->sglist, dma->n_pages);
-
-	/* fill scatter/gather list with pages */
-	for (i = 0; i < dma->n_pages; i++) {
-		unsigned long va =
-		    (unsigned long)dma->kvirt + (i << PAGE_SHIFT);
-
-		sg_set_page(&dma->sglist[i], vmalloc_to_page((void *)va),
-				PAGE_SIZE, 0);
-	}
-
-	/* map sglist to the IOMMU */
-	dma->n_dma_pages =
-	    pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
-
-	if (dma->n_dma_pages == 0) {
-		printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n");
-		goto err;
-	}
-
-	dma->dev = dev;
-	dma->direction = direction;
-
-	return 0;
-
-      err:
-	dma_region_free(dma);
-	return -ENOMEM;
-}
-
-/**
- * dma_region_free - unmap and free the buffer
- */
-void dma_region_free(struct dma_region *dma)
-{
-	if (dma->n_dma_pages) {
-		pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages,
-			     dma->direction);
-		dma->n_dma_pages = 0;
-		dma->dev = NULL;
-	}
-
-	vfree(dma->sglist);
-	dma->sglist = NULL;
-
-	vfree(dma->kvirt);
-	dma->kvirt = NULL;
-	dma->n_pages = 0;
-}
-
-/* find the scatterlist index and remaining offset corresponding to a
-   given offset from the beginning of the buffer */
-static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
-				  unsigned int start, unsigned long *rem)
-{
-	int i;
-	unsigned long off = offset;
-
-	for (i = start; i < dma->n_dma_pages; i++) {
-		if (off < sg_dma_len(&dma->sglist[i])) {
-			*rem = off;
-			break;
-		}
-
-		off -= sg_dma_len(&dma->sglist[i]);
-	}
-
-	BUG_ON(i >= dma->n_dma_pages);
-
-	return i;
-}
-
-/**
- * dma_region_offset_to_bus - get bus address of an offset within a DMA region
- *
- * Returns the DMA bus address of the byte with the given @offset relative to
- * the beginning of the @dma.
- */
-dma_addr_t dma_region_offset_to_bus(struct dma_region * dma,
-				    unsigned long offset)
-{
-	unsigned long rem = 0;
-
-	struct scatterlist *sg =
-	    &dma->sglist[dma_region_find(dma, offset, 0, &rem)];
-	return sg_dma_address(sg) + rem;
-}
-
-/**
- * dma_region_sync_for_cpu - sync the CPU's view of the buffer
- */
-void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
-			     unsigned long len)
-{
-	int first, last;
-	unsigned long rem = 0;
-
-	if (!len)
-		len = 1;
-
-	first = dma_region_find(dma, offset, 0, &rem);
-	last = dma_region_find(dma, rem + len - 1, first, &rem);
-
-	pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1,
-				dma->direction);
-}
-
-/**
- * dma_region_sync_for_device - sync the IO bus' view of the buffer
- */
-void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
-				unsigned long len)
-{
-	int first, last;
-	unsigned long rem = 0;
-
-	if (!len)
-		len = 1;
-
-	first = dma_region_find(dma, offset, 0, &rem);
-	last = dma_region_find(dma, rem + len - 1, first, &rem);
-
-	pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first],
-				   last - first + 1, dma->direction);
-}
-
-#ifdef CONFIG_MMU
-
-static int dma_region_pagefault(struct vm_area_struct *vma,
-				struct vm_fault *vmf)
-{
-	struct dma_region *dma = (struct dma_region *)vma->vm_private_data;
-
-	if (!dma->kvirt)
-		return VM_FAULT_SIGBUS;
-
-	if (vmf->pgoff >= dma->n_pages)
-		return VM_FAULT_SIGBUS;
-
-	vmf->page = vmalloc_to_page(dma->kvirt + (vmf->pgoff << PAGE_SHIFT));
-	get_page(vmf->page);
-	return 0;
-}
-
-static const struct vm_operations_struct dma_region_vm_ops = {
-	.fault = dma_region_pagefault,
-};
-
-/**
- * dma_region_mmap - map the buffer into a user space process
- */
-int dma_region_mmap(struct dma_region *dma, struct file *file,
-		    struct vm_area_struct *vma)
-{
-	unsigned long size;
-
-	if (!dma->kvirt)
-		return -EINVAL;
-
-	/* must be page-aligned (XXX: comment is wrong, we could allow pgoff) */
-	if (vma->vm_pgoff != 0)
-		return -EINVAL;
-
-	/* check the length */
-	size = vma->vm_end - vma->vm_start;
-	if (size > (dma->n_pages << PAGE_SHIFT))
-		return -EINVAL;
-
-	vma->vm_ops = &dma_region_vm_ops;
-	vma->vm_private_data = dma;
-	vma->vm_file = file;
-	vma->vm_flags |= VM_RESERVED | VM_ALWAYSDUMP;
-
-	return 0;
-}
-
-#else				/* CONFIG_MMU */
-
-int dma_region_mmap(struct dma_region *dma, struct file *file,
-		    struct vm_area_struct *vma)
-{
-	return -EINVAL;
-}
-
-#endif				/* CONFIG_MMU */