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Commit a57941c2 authored by Marin Mitov's avatar Marin Mitov Committed by Greg Kroah-Hartman
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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: default avatarMarin Mitov <mitov@issp.bas.bg>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent abfc768d
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Showing with 107 additions and 851 deletions
drivers/staging/dt3155v4l/Kconfig
View file @ a57941c2
......@@ -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"
......
drivers/staging/dt3155v4l/Makefile
View file @ a57941c2
obj-$(CONFIG_VIDEO_DT3155) += dt3155_v4l.o
dt3155_v4l-objs := \
dt3155-bufs.o \
dt3155v4l.o
obj-$(CONFIG_VIDEO_DT3155) += dt3155v4l.o
drivers/staging/dt3155v4l/dt3155-bufs.c deleted 100644 → 0
View file @ abfc768d
/***************************************************************************
* 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);
}
drivers/staging/dt3155v4l/dt3155-bufs.h deleted 100644 → 0
View file @ abfc768d
/***************************************************************************
* 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_ */
drivers/staging/dt3155v4l/dt3155v4l.c
View file @ a57941c2
This diff is collapsed.
drivers/staging/dt3155v4l/dt3155v4l.h
View file @ a57941c2
......@@ -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)
......
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