linux-imx

/*

 * mm.c - Micro Memory(tm) PCI memory board block device driver - v2.3

 *

 * (C) 2001 San Mehat <nettwerk@valinux.com>

 * (C) 2001 Johannes Erdfelt <jerdfelt@valinux.com>

 * (C) 2001 NeilBrown <neilb@cse.unsw.edu.au>

 *

 * This driver for the Micro Memory PCI Memory Module with Battery Backup

 * is Copyright Micro Memory Inc 2001-2002.  All rights reserved.

 *

 * This driver is released to the public under the terms of the

 *  GNU GENERAL PUBLIC LICENSE version 2

 * See the file COPYING for details.

 *

 * This driver provides a standard block device interface for Micro Memory(tm)

 * PCI based RAM boards.

 * 10/05/01: Phap Nguyen - Rebuilt the driver

 * 10/22/01: Phap Nguyen - v2.1 Added disk partitioning

 * 29oct2001:NeilBrown   - Use make_request_fn instead of request_fn

 *                       - use stand disk partitioning (so fdisk works).

 * 08nov2001:NeilBrown   - change driver name from "mm" to "umem"

 *           - incorporate into main kernel

 * 08apr2002:NeilBrown   - Move some of interrupt handle to tasklet

 *           - use spin_lock_bh instead of _irq

 *           - Never block on make_request.  queue

 *             bh's instead.

 *           - unregister umem from devfs at mod unload

 *           - Change version to 2.3

 * 07Nov2001:Phap Nguyen - Select pci read command: 06, 12, 15 (Decimal)

 * 07Jan2002: P. Nguyen  - Used PCI Memory Write & Invalidate for DMA

 * 15May2002:NeilBrown   - convert to bio for 2.5

 * 17May2002:NeilBrown   - remove init_mem initialisation.  Instead detect

 *           - a sequence of writes that cover the card, and

 *           - set initialised bit then.

 */

​

#undef DEBUG    /* #define DEBUG if you want debugging info (pr_debug) */

#include <linux/fs.h>

#include <linux/bio.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/mman.h>

#include <linux/gfp.h>

#include <linux/ioctl.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/timer.h>

#include <linux/pci.h>

#include <linux/dma-mapping.h>

​

#include <linux/fcntl.h>        /* O_ACCMODE */

#include <linux/hdreg.h>  /* HDIO_GETGEO */

​

#include "umem.h"

​

#include <linux/uaccess.h>

#include <asm/io.h>

​

#define MM_MAXCARDS 4

#define MM_RAHEAD 2      /* two sectors */

#define MM_BLKSIZE 1024  /* 1k blocks */

#define MM_HARDSECT 512  /* 512-byte hardware sectors */