linux-imx

​

/* drivers/atm/firestream.c - FireStream 155 (MB86697) and

 *                            FireStream  50 (MB86695) device driver 

 */

/* Written & (C) 2000 by R.E.Wolff@BitWizard.nl 

 * Copied snippets from zatm.c by Werner Almesberger, EPFL LRC/ICA 

 * and ambassador.c Copyright (C) 1995-1999  Madge Networks Ltd 

 */

​

/*

  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

​

  The GNU GPL is contained in /usr/doc/copyright/GPL on a Debian

  system and in the file COPYING in the Linux kernel source.

*/

​

​

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/pci.h>

#include <linux/poison.h>

#include <linux/errno.h>

#include <linux/atm.h>

#include <linux/atmdev.h>

#include <linux/sonet.h>

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/delay.h>

#include <linux/ioport.h> /* for request_region */

#include <linux/uio.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/capability.h>

#include <linux/bitops.h>

#include <linux/slab.h>

#include <asm/byteorder.h>

#include <asm/string.h>

#include <asm/io.h>

#include <linux/atomic.h>

#include <linux/uaccess.h>

#include <linux/wait.h>

​

#include "firestream.h"

​

static int loopback = 0;

static int num=0x5a;

​

/* According to measurements (but they look suspicious to me!) done in

 * '97, 37% of the packets are one cell in size. So it pays to have

 * buffers allocated at that size. A large jump in percentage of

 * packets occurs at packets around 536 bytes in length. So it also

 * pays to have those pre-allocated. Unfortunately, we can't fully

 * take advantage of this as the majority of the packets is likely to

 * be TCP/IP (As where obviously the measurement comes from) There the

 * link would be opened with say a 1500 byte MTU, and we can't handle

 * smaller buffers more efficiently than the larger ones. -- REW

 */

​

/* Due to the way Linux memory management works, specifying "576" as

 * an allocation size here isn't going to help. They are allocated

 * from 1024-byte regions anyway. With the size of the sk_buffs (quite

 * large), it doesn't pay to allocate the smallest size (64) -- REW */

​

/* This is all guesswork. Hard numbers to back this up or disprove this, 

 * are appreciated. -- REW */

​

/* The last entry should be about 64k. However, the "buffer size" is

 * passed to the chip in a 16 bit field. I don't know how "65536"

 * would be interpreted. -- REW */

​

#define NP FS_NR_FREE_POOLS

static int rx_buf_sizes[NP]  = {128,  256,  512, 1024, 2048, 4096, 16384, 65520};

/* log2:                 7     8     9    10    11    12    14     16 */

​

#if 0

static int rx_pool_sizes[NP] = {1024, 1024, 512, 256,  128,  64,   32,    32};

#else