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Staging: dt3155v4l: remove private memory allocator 

This patch removes the private memory allocator
and all conjugated functions. Now the driver uses
videobuf-dma-contig module for allocations.
Added reserving 4MB coherent memory for private
per device allocations at probe time.

Signed-off-by: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marin Mitov 2010-05-18 13:05:29 +03:00 committed by Greg Kroah-Hartman
parent abfc768d9e
commit a57941c2e7
6 changed files with 107 additions and 851 deletions
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2
drivers/staging/dt3155v4l/Kconfig
View File

@ -9,7 +9,7 @@ config VIDEO_DT3155
In doubt, say N.
To compile this driver as a module, choose M here: the
module will be called dt3155_v4l.
module will be called dt3155v4l.
config DT3155_CCIR
bool "Selects CCIR/50Hz vertical refresh"

5
drivers/staging/dt3155v4l/Makefile
View File

@ -1,4 +1 @@
obj-$(CONFIG_VIDEO_DT3155) += dt3155_v4l.o
dt3155_v4l-objs := \
dt3155-bufs.o \
dt3155v4l.o
obj-$(CONFIG_VIDEO_DT3155) += dt3155v4l.o

256
drivers/staging/dt3155v4l/dt3155-bufs.c
View File

@ -1,256 +0,0 @@
/***************************************************************************
* Copyright (C) 2006-2010 by Marin Mitov *
* mitov@issp.bas.bg *
* *
* 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. *
***************************************************************************/
#include "dt3155-bufs.h"
/**
* dt3155_init_chunks_buf - creates a chunk buffer and allocates memory for it
*
* returns: a pointer to the struct dt3155_buf or NULL if failed
*
* Creates a struct dt3155_buf, then allocates a chunk of memory of
* size DT3155_CHUNK_SIZE and sets all the pages in it as Reserved.
* This is done to be able to use remap_pfn_range() on these buffers
* (which do not work on normal memory if Reserved bit is not set)
*/
struct dt3155_buf *
dt3155_init_chunks_buf(void)
{ /* could sleep */
struct dt3155_buf *buf;
int i;
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
return NULL;
buf->cpu = (void *)__get_free_pages(DT3155_CHUNK_FLAGS,
get_order(DT3155_CHUNK_SIZE));
if (!buf->cpu) {
kfree(buf);
return NULL;
}
for (i = 0; i < DT3155_CHUNK_SIZE; i += PAGE_SIZE)
SetPageReserved(virt_to_page(buf->cpu + i));
return buf; /* success */
}
/**
* dt3155_free_chunks_buf - destroys the specified buffer
*
* @buf: the buffer to be freed
*
* Clears Reserved bit of all pages in the chunk, frees the chunk memory
* and destroys struct dt3155_buf.
*/
void
dt3155_free_chunks_buf(struct dt3155_buf *buf)
{
int i;
for (i = 0; i < DT3155_CHUNK_SIZE; i += PAGE_SIZE)
ClearPageReserved(virt_to_page(buf->cpu + i));
free_pages((unsigned long)buf->cpu, get_order(DT3155_CHUNK_SIZE));
kfree(buf);
}
/**
* dt3155_init_fifo - creates and initializes a fifo
*
* returns: a pointer to the crated and initialized struct dt3155_fifo
* or NULL if failed
*/
struct dt3155_fifo *
dt3155_init_fifo(void)
{ /* could sleep */
struct dt3155_fifo *fifo = kzalloc(sizeof(*fifo), GFP_KERNEL);
if (fifo)
spin_lock_init(&fifo->lock);
return fifo;
}
/* dt3155_free_fifo(x) defined as macro in dt3155.h */
/**
* dt3155_get_buf - gets a buffer from the fifo
*
* @fifo: the fifo to get a buffer from
*
* returns: a pointer to the buffer or NULL if failed
*
* dt3155_get_buf gets the fifo's spin_lock and returns the
* buffer pointed by the head. Could be used in any context.
*/
struct dt3155_buf *
dt3155_get_buf(struct dt3155_fifo *fifo)
{
unsigned long flags;
struct dt3155_buf *tmp_buf;
spin_lock_irqsave(&fifo->lock, flags);
tmp_buf = fifo->head;
if (fifo->head)
fifo->head = fifo->head->next;
if (!fifo->head)
fifo->tail = NULL;
spin_unlock_irqrestore(&fifo->lock, flags);
return tmp_buf;
}
/**
* dt3155_put_buf - puts a buffer into a fifo
*
* @buf: the buffer to put
* @fifo: the fifo to put the buffer in
*
* dt3155_put_buf gets the fifo's spin_lock and puts the buf
* at the tail of the fifo. Could be used in any context.
*/
void
dt3155_put_buf(struct dt3155_buf *buf, struct dt3155_fifo *fifo)
{
unsigned long flags;
spin_lock_irqsave(&fifo->lock, flags);
buf->next = NULL;
if (fifo->tail)
fifo->tail->next = buf;
fifo->tail = buf;
if (!fifo->head)
fifo->head = buf;
spin_unlock_irqrestore(&fifo->lock, flags);
}
/**
* dt3155_init_chunks_fifo - creates and fills a chunks_fifo
*
* returns: a pointer to the fifo or NULL if failed
*
* dt3155_init_chunks_fifo creates and fills the fifo with
* a number of chunks <= DT3155_CHUNK_NUM. The returned fifo
* contains at least one chunk.
*/
struct dt3155_fifo *
dt3155_init_chunks_fifo(void)
{ /* could sleep */
int i;
struct dt3155_fifo *chunks;
struct dt3155_buf *tmp_buf;
chunks = dt3155_init_fifo();
if (!chunks)
return NULL;
tmp_buf = dt3155_init_chunks_buf();
if (!tmp_buf) {
dt3155_free_fifo(chunks);
return NULL;
}
dt3155_put_buf(tmp_buf, chunks);
for (i = 1; i < DT3155_CHUNK_NUM; i++) {
tmp_buf = dt3155_init_chunks_buf();
if (!tmp_buf)
break;
dt3155_put_buf(tmp_buf, chunks);
}
return chunks;
}
/**
* dt3155_free_chunks_fifo - empties and destroys the chunks_fifo
*
* @chunks: the chunks_fifo to be freed
*
* dt3155_free_chunks_fifo deallocates all chunks in the fifo and
* destroys it.
*/
void
dt3155_free_chunks_fifo(struct dt3155_fifo *chunks)
{
int buf_count = 0;
struct dt3155_buf *buf;
while ((buf = dt3155_get_buf(chunks))) {
dt3155_free_chunks_buf(buf);
buf_count++;
}
dt3155_free_fifo(chunks);
printk(KERN_INFO "dt3155: %i chunks freed\n", buf_count);
}
/**
* dt3155_init_ibufs_fifo - creates and fills an image buffer fifo
*
* @chunks: chunks_fifo to take memory from
* @buf_size: the size of image buffers
*
* returns: a pointer to the fifo filled with image buffers
*
* dt3155_init_ibufs_fifo takes chunks from chunks_fifo, chops them
* into pieces of size buf_size and fills image fifo with them.
*/
struct dt3155_fifo *
dt3155_init_ibufs_fifo(struct dt3155_fifo *chunks, int buf_size)
{ /* could sleep */
int i, buf_count = 0;
struct dt3155_buf *tmp_ibuf, *chunks_buf, *last_chunk;
struct dt3155_fifo *tmp_fifo;
tmp_fifo = dt3155_init_fifo();
if (!tmp_fifo)
return NULL;
last_chunk = chunks->tail;
do {
chunks_buf = dt3155_get_buf(chunks);
dt3155_put_buf(chunks_buf, chunks);
for (i = 0; i < DT3155_CHUNK_SIZE / buf_size; i++) {
tmp_ibuf = kzalloc(sizeof(*tmp_ibuf), GFP_KERNEL);
if (tmp_ibuf) {
tmp_ibuf->cpu =
chunks_buf->cpu + DT3155_BUF_SIZE * i;
dt3155_put_buf(tmp_ibuf, tmp_fifo);
buf_count++;
} else {
if (buf_count) {
goto print_num_bufs;
} else {
dt3155_free_fifo(tmp_fifo);
return NULL;
}
}
}
} while (chunks_buf != last_chunk);
print_num_bufs:
printk(KERN_INFO "dt3155: %i image buffers available\n", buf_count);
return tmp_fifo;
}
/**
* dt3155_free_ibufs_fifo - empties and destroys an image fifo
*
* @fifo: the fifo to free
*/
void
dt3155_free_ibufs_fifo(struct dt3155_fifo *fifo)
{
struct dt3155_buf *tmp_ibuf;
while ((tmp_ibuf = dt3155_get_buf(fifo)))
kfree(tmp_ibuf);
kfree(fifo);
}

88
drivers/staging/dt3155v4l/dt3155-bufs.h
View File

@ -1,88 +0,0 @@
/***************************************************************************
* Copyright (C) 2006-2010 by Marin Mitov *
* mitov@issp.bas.bg *
* *
* 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. *
***************************************************************************/
#ifndef _DT3155_BUFS_H_
#define _DT3155_BUFS_H_
#include <linux/pci.h>
/* 4 chunks of 4MB, 9 buffers each = 36 buffers (> VIDEO_MAX_FRAME) */
#define DT3155_CHUNK_NUM 4
/* DT3155_CHUNK_SIZE should be 4M (2^22) or less, but more than image size */
#define DT3155_CHUNK_SIZE (1U << 22)
#define DT3155_CHUNK_FLAGS (GFP_KERNEL | GFP_DMA32 | __GFP_COLD | __GFP_NOWARN)
/* DT3155_BUF_SIZE = 108 * PAGE_SIZE, so each buf is PAGE_SIZE alligned */
#define DT3155_BUF_SIZE (768 * 576)
/**
* struct dt3155_buf - image buffer structure
*
* @cpu: virtual kernel address of the buffer
* @dma: dma (bus) address of the buffer
* @next: pointer to the next buffer in the fifo
* @tv: time value when the image has been acquired
*/
struct dt3155_buf {
void *cpu;
dma_addr_t dma;
struct dt3155_buf *next;
struct timeval tv;
};
/**
* struct dt3155_fifo - fifo structure
*
* @head: pointer to the head of the fifo
* @tail: pionter to the tail of the fifo
* @lock: spin_lock to protect the fifo
*/
struct dt3155_fifo {
struct dt3155_buf *head;
struct dt3155_buf *tail;
spinlock_t lock;
};
struct dt3155_buf * __must_check
dt3155_init_chunks_buf(void);
void
dt3155_free_chunks_buf(struct dt3155_buf *buf);
struct dt3155_fifo * __must_check
dt3155_init_fifo(void);
#define dt3155_free_fifo(x) kfree(x)
struct dt3155_buf * __must_check
dt3155_get_buf(struct dt3155_fifo *fifo);
void
dt3155_put_buf(struct dt3155_buf *buf, struct dt3155_fifo *fifo);
struct dt3155_fifo * __must_check
dt3155_init_chunks_fifo(void);
void
dt3155_free_chunks_fifo(struct dt3155_fifo *chunks);
struct dt3155_fifo * __must_check
dt3155_init_ibufs_fifo(struct dt3155_fifo *chunks, int buf_size);
void
dt3155_free_ibufs_fifo(struct dt3155_fifo *fifo);
#endif /* _DT3155_BUFS_H_ */

603
drivers/staging/dt3155v4l/dt3155v4l.c
View File

@ -18,22 +18,26 @@
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <media/v4l2-dev.h>
#include <media/videobuf-core.h>
#include <media/v4l2-ioctl.h>
#include <linux/pci.h>
#include <linux/version.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <media/videobuf-dma-contig.h>
#include <linux/kthread.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf-dma-contig.h>
#include "dt3155v4l.h"
#include "dt3155-bufs.h"
#define DT3155_VENDOR_ID 0x8086
#define DT3155_DEVICE_ID 0x1223
/* DT3155_CHUNK_SIZE is 4M (2^22) 8 full size buffers */
#define DT3155_CHUNK_SIZE (1U << 22)
#define DT3155_COH_FLAGS (GFP_KERNEL | GFP_DMA32 | __GFP_COLD | __GFP_NOWARN)
#define DT3155_BUF_SIZE (768 * 576)
/* global initializers (for all boards) */
#ifdef CONFIG_DT3155_CCIR
static const u8 csr2_init = VT_50HZ;
@ -190,441 +194,6 @@ static int wait_i2c_reg(void __iomem *addr)
return 0;
}
/*
* global pointers to a list of 4MB chunks reserved at driver
* load, broken down to contiguous buffers of 768 * 576 bytes
* each to form a pool of buffers for allocations
* FIXME: add spinlock to protect moves between alloc/free lists
*/
static struct dt3155_fifo *dt3155_chunks; /* list of 4MB chuncks */
static struct dt3155_fifo *dt3155_free_bufs; /* list of free buffers */
static struct dt3155_fifo *dt3155_alloc_bufs; /* list of allocated buffers */
/* same as in <drivers/media/video/videobuf-dma-contig.c> */
struct videobuf_dma_contig_memory {
u32 magic;
void *vaddr;
dma_addr_t dma_handle;
unsigned long size;
int is_userptr;
};
#define MAGIC_DC_MEM 0x0733ac61
#define MAGIC_CHECK(is, should) \
if (unlikely((is) != (should))) { \
pr_err("magic mismatch: %x expected %x\n", (is), (should)); \
BUG(); \
}
/* helper functions to allocate/free buffers from the pool */
static void *
dt3155_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
struct dt3155_buf *buf;
if (size > DT3155_BUF_SIZE)
return NULL;
size = DT3155_BUF_SIZE; /* same for CCIR & RS-170 */
buf = dt3155_get_buf(dt3155_free_bufs);
if (!buf)
return NULL;
buf->dma = dma_map_single(dev, buf->cpu, size, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, buf->dma)) {
dt3155_put_buf(buf, dt3155_free_bufs);
return NULL;
}
dt3155_put_buf(buf, dt3155_alloc_bufs);
*dma_handle = buf->dma;
return buf->cpu;
}
static void
dt3155_free_buffer(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)
{
struct dt3155_buf *buf, *last;
int found = 0;
if (!cpu_addr) /* to free NULL is OK */
return;
last = dt3155_get_buf(dt3155_alloc_bufs);
if (!last) {
printk(KERN_ERR "dt3155: %s(): no alloc buffers\n", __func__);
return;
}
dt3155_put_buf(last, dt3155_alloc_bufs);
do {
buf = dt3155_get_buf(dt3155_alloc_bufs);
if (buf->cpu == cpu_addr && buf->dma == dma_handle) {
found = 1;
break;
}
dt3155_put_buf(buf, dt3155_alloc_bufs);
} while (buf != last);
if (!found) {
printk(KERN_ERR "dt3155: %s(): buffer not found\n", __func__);
return;
}
size = DT3155_BUF_SIZE; /* same for CCIR & RS-170 */
dma_unmap_single(dev, dma_handle, size, DMA_FROM_DEVICE);
dt3155_put_buf(buf, dt3155_free_bufs);
}
/* same as videobuf_dma_contig_user_get() */
static int
dt3155_dma_contig_user_get(struct videobuf_dma_contig_memory *mem,
struct videobuf_buffer *vb)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
unsigned long prev_pfn, this_pfn;
unsigned long pages_done, user_address;
unsigned int offset;
int ret;
offset = vb->baddr & ~PAGE_MASK;
mem->size = PAGE_ALIGN(vb->size + offset);
mem->is_userptr = 0;
ret = -EINVAL;
down_read(&mm->mmap_sem);
vma = find_vma(mm, vb->baddr);
if (!vma)
goto out_up;
if ((vb->baddr + mem->size) > vma->vm_end)
goto out_up;
pages_done = 0;
prev_pfn = 0; /* kill warning */
user_address = vb->baddr;
while (pages_done < (mem->size >> PAGE_SHIFT)) {
ret = follow_pfn(vma, user_address, &this_pfn);
if (ret)
break;
if (pages_done == 0)
mem->dma_handle = (this_pfn << PAGE_SHIFT) + offset;
else if (this_pfn != (prev_pfn + 1))
ret = -EFAULT;
if (ret)
break;
prev_pfn = this_pfn;
user_address += PAGE_SIZE;
pages_done++;
}
if (!ret)
mem->is_userptr = 1;
out_up:
up_read(&current->mm->mmap_sem);
return ret;
}
/* same as videobuf_dma_contig_user_put() */
static void
dt3155_dma_contig_user_put(struct videobuf_dma_contig_memory *mem)
{
mem->is_userptr = 0;
mem->dma_handle = 0;
mem->size = 0;
}
/* same as videobuf_iolock() but uses allocations from the pool */
static int
dt3155_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
struct v4l2_framebuffer *fbuf)
{
struct videobuf_dma_contig_memory *mem = vb->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
switch (vb->memory) {
case V4L2_MEMORY_MMAP:
dev_dbg(q->dev, "%s memory method MMAP\n", __func__);
/* All handling should be done by __videobuf_mmap_mapper() */
if (!mem->vaddr) {
dev_err(q->dev, "memory is not alloced/mmapped.\n");
return -EINVAL;
}
break;
case V4L2_MEMORY_USERPTR:
dev_dbg(q->dev, "%s memory method USERPTR\n", __func__);
/* handle pointer from user space */
if (vb->baddr)
return dt3155_dma_contig_user_get(mem, vb);
/* allocate memory for the read() method */
mem->size = PAGE_ALIGN(vb->size);
mem->vaddr = dt3155_alloc_buffer(q->dev, mem->size,
&mem->dma_handle, GFP_KERNEL);
if (!mem->vaddr) {
dev_err(q->dev, "dma_alloc_coherent %ld failed\n",
mem->size);
return -ENOMEM;
}
dev_dbg(q->dev, "dma_alloc_coherent data is at %p (%ld)\n",
mem->vaddr, mem->size);
break;
case V4L2_MEMORY_OVERLAY:
default:
dev_dbg(q->dev, "%s memory method OVERLAY/unknown\n",
__func__);
return -EINVAL;
}
return 0;
}
/* same as videobuf_dma_contig_free() but uses the pool */
void
dt3155_dma_contig_free(struct videobuf_queue *q, struct videobuf_buffer *buf)
{
struct videobuf_dma_contig_memory *mem = buf->priv;
/* mmapped memory can't be freed here, otherwise mmapped region
would be released, while still needed. In this case, the memory
release should happen inside videobuf_vm_close().
So, it should free memory only if the memory were allocated for
read() operation.
*/
if (buf->memory != V4L2_MEMORY_USERPTR)
return;
if (!mem)
return;
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
/* handle user space pointer case */
if (buf->baddr) {
dt3155_dma_contig_user_put(mem);
return;
}
/* read() method */
dt3155_free_buffer(q->dev, mem->size, mem->vaddr, mem->dma_handle);
mem->vaddr = NULL;
}
/* same as videobuf_vm_open() */
static void
dt3155_vm_open(struct vm_area_struct *vma)
{
struct videobuf_mapping *map = vma->vm_private_data;
dev_dbg(map->q->dev, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
map, map->count, vma->vm_start, vma->vm_end);
map->count++;
}
/* same as videobuf_vm_close(), but free to the pool */
static void
dt3155_vm_close(struct vm_area_struct *vma)
{
struct videobuf_mapping *map = vma->vm_private_data;
struct videobuf_queue *q = map->q;
int i;
dev_dbg(q->dev, "vm_close %p [count=%u,vma=%08lx-%08lx]\n",
map, map->count, vma->vm_start, vma->vm_end);
map->count--;
if (0 == map->count) {
struct videobuf_dma_contig_memory *mem;
dev_dbg(q->dev, "munmap %p q=%p\n", map, q);
mutex_lock(&q->vb_lock);
/* We need first to cancel streams, before unmapping */
if (q->streaming)
videobuf_queue_cancel(q);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
if (q->bufs[i]->map != map)
continue;
mem = q->bufs[i]->priv;
if (mem) {
/* This callback is called only if kernel has
allocated memory and this memory is mmapped.
In this case, memory should be freed,
in order to do memory unmap.
*/
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
/* vfree is not atomic - can't be
called with IRQ's disabled
*/
dev_dbg(q->dev, "buf[%d] freeing %p\n",
i, mem->vaddr);
dt3155_free_buffer(q->dev, mem->size,
mem->vaddr, mem->dma_handle);
mem->vaddr = NULL;
}
q->bufs[i]->map = NULL;
q->bufs[i]->baddr = 0;
}
kfree(map);
mutex_unlock(&q->vb_lock);
}
}
static const struct vm_operations_struct dt3155_vm_ops = {
.open = dt3155_vm_open,
.close = dt3155_vm_close,
};
/* same as videobuf_mmap_mapper(), but allocates from the pool */
static int
dt3155_mmap_mapper(struct videobuf_queue *q, struct videobuf_buffer *buf,
struct vm_area_struct *vma)
{
struct videobuf_dma_contig_memory *mem;
struct videobuf_mapping *map;
int retval;
unsigned long size;
dev_dbg(q->dev, "%s\n", __func__);
/* create mapping + update buffer list */
map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
if (!map)
return -ENOMEM;
buf->map = map;
map->start = vma->vm_start;
map->end = vma->vm_end;
map->q = q;
buf->baddr = vma->vm_start;
mem = buf->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
mem->size = PAGE_ALIGN(buf->bsize);
mem->vaddr = dt3155_alloc_buffer(q->dev, mem->size,
&mem->dma_handle, GFP_KERNEL);
if (!mem->vaddr) {
dev_err(q->dev, "dma_alloc_coherent size %ld failed\n",
mem->size);
goto error;
}
dev_dbg(q->dev, "dma_alloc_coherent data is at addr %p (size %ld)\n",
mem->vaddr, mem->size);
/* Try to remap memory */
size = vma->vm_end - vma->vm_start;
size = (size < mem->size) ? size : mem->size;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
retval = remap_pfn_range(vma, vma->vm_start,
mem->dma_handle >> PAGE_SHIFT,
size, vma->vm_page_prot);
if (retval) {
dev_err(q->dev, "mmap: remap failed with error %d. ", retval);
dt3155_free_buffer(q->dev, mem->size,
mem->vaddr, mem->dma_handle);
goto error;
}
vma->vm_ops = &dt3155_vm_ops;
vma->vm_flags |= VM_DONTEXPAND;
vma->vm_private_data = map;
dev_dbg(q->dev, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
map, q, vma->vm_start, vma->vm_end,
(long int)buf->bsize,
vma->vm_pgoff, buf->i);
dt3155_vm_open(vma);
return 0;
error:
kfree(map);
return -ENOMEM;
}
static int
dt3155_sync_for_cpu(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
struct dt3155_priv *pd = q->priv_data;
struct videobuf_dma_contig_memory *mem = vb->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
pci_dma_sync_single_for_cpu(pd->pdev, mem->dma_handle,
mem->size, PCI_DMA_FROMDEVICE);
return 0;
}
static int
dt3155_sync_for_device(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
struct dt3155_priv *pd = q->priv_data;
struct videobuf_dma_contig_memory *mem = vb->priv;
BUG_ON(!mem);
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
pci_dma_sync_single_for_device(pd->pdev, mem->dma_handle,
mem->size, PCI_DMA_FROMDEVICE);
return 0;
}
/*
* same as videobuf_queue_dma_contig_init(), but after
* initialisation overwrites videobuf_iolock() and
* videobuf_mmap_mapper() with our customized versions
* as well as adds sync() method
*/
static void
dt3155_queue_dma_contig_init(struct videobuf_queue *q,
struct videobuf_queue_ops *ops,
struct device *dev,
spinlock_t *irqlock,
enum v4l2_buf_type type,
enum v4l2_field field,
unsigned int msize,
void *priv)
{
struct dt3155_priv *pd = priv;
videobuf_queue_dma_contig_init(q, ops, dev, irqlock,
type, field, msize, priv);
/* replace with local copy */
pd->qt_ops = *q->int_ops;
q->int_ops = &pd->qt_ops;
/* and overwrite with our methods */
q->int_ops->iolock = dt3155_iolock;
q->int_ops->mmap_mapper = dt3155_mmap_mapper;
q->int_ops->sync = dt3155_sync_for_cpu;
}
static int
dt3155_start_acq(struct dt3155_priv *pd)
{
@ -699,7 +268,7 @@ dt3155_buf_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
if (ret) {
vb->state = VIDEOBUF_ERROR;
printk(KERN_ERR "ERROR: videobuf_iolock() failed\n");
videobuf_dma_contig_free(q, vb);
videobuf_dma_contig_free(q, vb); /* FIXME: needed? */
} else
vb->state = VIDEOBUF_PREPARED;
return ret;
@ -713,7 +282,6 @@ dt3155_buf_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
if (vb->state != VIDEOBUF_NEEDS_INIT) {
vb->state = VIDEOBUF_QUEUED;
dt3155_sync_for_device(q, vb);
list_add_tail(&vb->queue, &pd->dmaq);
wake_up_interruptible_sync(&pd->do_dma);
} else
@ -726,7 +294,7 @@ dt3155_buf_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
if (vb->state == VIDEOBUF_ACTIVE)
videobuf_waiton(vb, 0, 0); /* FIXME: cannot be interrupted */
dt3155_dma_contig_free(q, vb);
videobuf_dma_contig_free(q, vb);
vb->state = VIDEOBUF_NEEDS_INIT;
}
@ -869,7 +437,7 @@ dt3155_open(struct file *filp)
ret = -ENOMEM;
goto err_alloc_queue;
}
dt3155_queue_dma_contig_init(pd->vidq, &vbq_ops,
videobuf_queue_dma_contig_init(pd->vidq, &vbq_ops,
&pd->pdev->dev, &pd->lock,
V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
sizeof(struct videobuf_buffer), pd);
@ -1317,11 +885,13 @@ static const struct v4l2_ioctl_ops dt3155_ioctl_ops = {
static int __devinit
dt3155_init_board(struct pci_dev *dev)
{
struct dt3155_priv *pd = pci_get_drvdata(dev);
void *buf_cpu;
dma_addr_t buf_dma;
int i;
u8 tmp;
struct dt3155_buf *buf;
struct dt3155_priv *pd = pci_get_drvdata(dev);
pci_set_master(dev); /* dt3155 needs it */
pci_set_master(dev); /* dt3155 needs it */
/* resetting the adapter */
iowrite32(FLD_CRPT_ODD | FLD_CRPT_EVEN | FLD_DN_ODD | FLD_DN_EVEN,
@ -1381,22 +951,16 @@ dt3155_init_board(struct pci_dev *dev)
write_i2c_reg(pd->regs, AD_ADDR, AD_CMD_REG);
write_i2c_reg(pd->regs, AD_CMD, VIDEO_CNL_1 | SYNC_CNL_1 | SYNC_LVL_3);
/* allocate and pci_map memory, and initialize the DMA machine */
buf = dt3155_get_buf(dt3155_free_bufs);
if (!buf) {
printk(KERN_ERR "dt3155: dt3155_get_buf "
/* allocate memory, and initialize the DMA machine */
buf_cpu = dma_alloc_coherent(&dev->dev, DT3155_BUF_SIZE, &buf_dma,
GFP_KERNEL);
if (!buf_cpu) {
printk(KERN_ERR "dt3155: dma_alloc_coherent "
"(in dt3155_init_board) failed\n");
return -ENOMEM;
}
buf->dma = pci_map_single(dev, buf->cpu,
DT3155_BUF_SIZE, PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(dev, buf->dma)) {
printk(KERN_ERR "dt3155: pci_map_single failed\n");
dt3155_put_buf(buf, dt3155_free_bufs);
return -ENOMEM;
}
iowrite32(buf->dma, pd->regs + EVEN_DMA_START);
iowrite32(buf->dma, pd->regs + ODD_DMA_START);
iowrite32(buf_dma, pd->regs + EVEN_DMA_START);
iowrite32(buf_dma, pd->regs + ODD_DMA_START);
iowrite32(0, pd->regs + EVEN_DMA_STRIDE);
iowrite32(0, pd->regs + ODD_DMA_STRIDE);
@ -1413,9 +977,8 @@ dt3155_init_board(struct pci_dev *dev)
write_i2c_reg(pd->regs, CSR2, pd->csr2);
iowrite32(FIFO_EN | SRST | FLD_DN_EVEN | FLD_DN_ODD, pd->regs + CSR1);
/* pci_unmap and deallocate memory */
pci_unmap_single(dev, buf->dma, DT3155_BUF_SIZE, PCI_DMA_FROMDEVICE);
dt3155_put_buf(buf, dt3155_free_bufs);
/* deallocate memory */
dma_free_coherent(&dev->dev, DT3155_BUF_SIZE, buf_cpu, buf_dma);
if (tmp & BUSY_EVEN) {
printk(KERN_ERR "dt3155: BUSY_EVEN not cleared\n");
return -EIO;
@ -1433,17 +996,82 @@ static struct video_device dt3155_vdev = {
.current_norm = DT3155_CURRENT_NORM,
};
/* same as in drivers/base/dma-coherent.c */
struct dma_coherent_mem {
void *virt_base;
u32 device_base;
int size;
int flags;
unsigned long *bitmap;
};
static int __devinit
dt3155_alloc_coherent(struct device *dev, size_t size, int flags)
{
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
if ((flags & DMA_MEMORY_MAP) == 0)
goto out;
if (!size)
goto out;
if (dev->dma_mem)
goto out;
dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
if (!dev->dma_mem)
goto out;
dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!dev->dma_mem->bitmap)
goto err_bitmap;
dev->dma_mem->virt_base = dma_alloc_coherent(dev, size,
&dev->dma_mem->device_base, DT3155_COH_FLAGS);
if (!dev->dma_mem->virt_base)
goto err_coherent;
dev->dma_mem->size = pages;
dev->dma_mem->flags = flags;
return DMA_MEMORY_MAP;
err_coherent:
kfree(dev->dma_mem->bitmap);
err_bitmap:
kfree(dev->dma_mem);
out:
return 0;
}
static void __devexit
dt3155_free_coherent(struct device *dev)
{
struct dma_coherent_mem *mem = dev->dma_mem;
if (!mem)
return;
dev->dma_mem = NULL;
dma_free_coherent(dev, mem->size << PAGE_SHIFT,
mem->virt_base, mem->device_base);
kfree(mem->bitmap);
kfree(mem);
}
static int __devinit
dt3155_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err = -ENODEV;
int err;
struct dt3155_priv *pd;
printk(KERN_INFO "dt3155: probe()\n");
if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
err = dma_set_mask(&dev->dev, DMA_BIT_MASK(32));
if (err) {
printk(KERN_ERR "dt3155: cannot set dma_mask\n");
return -ENODEV;
}
err = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
if (err) {
printk(KERN_ERR "dt3155: cannot set dma_coherent_mask\n");
return -ENODEV;
}
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd) {
printk(KERN_ERR "dt3155: cannot allocate dt3155_priv\n");
@ -1451,12 +1079,12 @@ dt3155_probe(struct pci_dev *dev, const struct pci_device_id *id)
}
pd->vdev = video_device_alloc();
if (!pd->vdev) {
printk(KERN_ERR "dt3155: cannot allocate vdp structure\n");
printk(KERN_ERR "dt3155: cannot allocate vdev structure\n");
goto err_video_device_alloc;
}
*pd->vdev = dt3155_vdev;
pci_set_drvdata(dev, pd); /* for use in dt3155_remove() */
video_set_drvdata(pd->vdev, pd); /* for use in video_fops */
pci_set_drvdata(dev, pd); /* for use in dt3155_remove() */
video_set_drvdata(pd->vdev, pd); /* for use in video_fops */
pd->users = 0;
pd->acq_fp = NULL;
pd->pdev = dev;
@ -1489,6 +1117,10 @@ dt3155_probe(struct pci_dev *dev, const struct pci_device_id *id)
printk(KERN_ERR "dt3155: Cannot register video device\n");
goto err_init_board;
}
err = dt3155_alloc_coherent(&dev->dev, DT3155_CHUNK_SIZE,
DMA_MEMORY_MAP);
if (err)
printk(KERN_INFO "dt3155: preallocated 8 buffers\n");
printk(KERN_INFO "dt3155: /dev/video%i is ready\n", pd->vdev->minor);
return 0; /* success */
@ -1511,6 +1143,7 @@ dt3155_remove(struct pci_dev *dev)
struct dt3155_priv *pd = pci_get_drvdata(dev);
printk(KERN_INFO "dt3155: remove()\n");
dt3155_free_coherent(&dev->dev);
video_unregister_device(pd->vdev);
pci_iounmap(dev, pd->regs);
pci_release_region(pd->pdev, 0);
@ -1542,48 +1175,18 @@ dt3155_init_module(void)
printk(KERN_INFO "dt3155: ==================\n");
printk(KERN_INFO "dt3155: init()\n");
dt3155_chunks = dt3155_init_chunks_fifo();
if (!dt3155_chunks) {
err = -ENOMEM;
printk(KERN_ERR "dt3155: cannot init dt3155_chunks_fifo\n");
goto err_init_chunks_fifo;
}
dt3155_free_bufs = dt3155_init_ibufs_fifo(dt3155_chunks,
DT3155_BUF_SIZE);
if (!dt3155_free_bufs) {
err = -ENOMEM;
printk(KERN_ERR "dt3155: cannot dt3155_init_ibufs_fifo\n");
goto err_init_ibufs_fifo;
}
dt3155_alloc_bufs = dt3155_init_fifo();
if (!dt3155_alloc_bufs) {
err = -ENOMEM;
printk(KERN_ERR "dt3155: cannot dt3155_init_fifo\n");
goto err_init_fifo;
}
err = pci_register_driver(&pci_driver);
if (err) {
printk(KERN_ERR "dt3155: cannot register pci_driver\n");
goto err_register_driver;
return err;
}
return 0; /* succes */
err_register_driver:
dt3155_free_fifo(dt3155_alloc_bufs);
err_init_fifo:
dt3155_free_ibufs_fifo(dt3155_free_bufs);
err_init_ibufs_fifo:
dt3155_free_chunks_fifo(dt3155_chunks);
err_init_chunks_fifo:
return err;
}
static void __exit
dt3155_exit_module(void)
{
pci_unregister_driver(&pci_driver);
dt3155_free_fifo(dt3155_alloc_bufs);
dt3155_free_ibufs_fifo(dt3155_free_bufs);
dt3155_free_chunks_fifo(dt3155_chunks);
printk(KERN_INFO "dt3155: exit()\n");
printk(KERN_INFO "dt3155: ==================\n");
}

4
drivers/staging/dt3155v4l/dt3155v4l.h
View File

@ -29,8 +29,8 @@
#define DT3155_NAME "dt3155"
#define DT3155_VER_MAJ 1
#define DT3155_VER_MIN 0
#define DT3155_VER_EXT 3
#define DT3155_VER_MIN 1
#define DT3155_VER_EXT 0
#define DT3155_VERSION __stringify(DT3155_VER_MAJ) "." \
__stringify(DT3155_VER_MIN) "." \
__stringify(DT3155_VER_EXT)