/* elan-104nc.c -- MTD map driver for Arcom Control Systems ELAN-104NC    Copyright (C) 2000 Arcom Control System 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   $Id: elan-104nc.c,v 1.2 2007/09/21 03:09:24 quy Exp $The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16mode.  This drivers uses the CFI probe and Intel Extended Command Set drivers.The flash is accessed as follows:   32 kbyte memory window at 0xb0000-0xb7fff      16 bit I/O port (0x22) for some sort of paging.The single flash device is divided into 3 partition which appear as separateMTD devices.Linux thinks that the I/O port is used by the PIC and hence check_region() willalways fail.  So we don't do it.  I just hope it doesn't break anything.*/#include <linux/module.h>#include <linux/slab.h>#include <linux/ioport.h>#include <linux/init.h>#include <asm/io.h>#include <linux/mtd/map.h>#include <linux/mtd/mtd.h>#include <linux/mtd/partitions.h>#define WINDOW_START 0xb0000/* Number of bits in offset. */#define WINDOW_SHIFT 15#define WINDOW_LENGTH (1 << WINDOW_SHIFT)/* The bits for the offset into the window. */#define WINDOW_MASK (WINDOW_LENGTH-1)#define PAGE_IO 0x22#define PAGE_IO_SIZE 2static volatile int page_in_window = -1; // Current page in window.static unsigned long iomapadr;static spinlock_t elan_104nc_spin = SPIN_LOCK_UNLOCKED;/* partition_info gives details on the logical partitions that the split the  * single flash device into. If the size if zero we use up to the end of the * device. */static struct mtd_partition partition_info[]={    { .name = "ELAN-104NC flash boot partition",       .offset = 0,       .size = 640*1024 },    { .name = "ELAN-104NC flash partition 1",       .offset = 640*1024,       .size = 896*1024 },    { .name = "ELAN-104NC flash partition 2",       .offset = (640+896)*1024 }};#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))/* * If no idea what is going on here.  This is taken from the FlashFX stuff. */#define ROMCS 1static inline void elan_104nc_setup(void){    u16 t;    outw( 0x0023 + ROMCS*2, PAGE_IO );    t=inb( PAGE_IO+1 );    t=(t & 0xf9) | 0x04;    outw( ((0x0023 + ROMCS*2) | (t << 8)), PAGE_IO );}static inline void elan_104nc_page(struct map_info *map, unsigned long ofs){	unsigned long page = ofs >> WINDOW_SHIFT;       	if( page!=page_in_window ) {		int cmd1;		int cmd2;		cmd1=(page & 0x700) + 0x0833 + ROMCS*0x4000;		cmd2=((page & 0xff) << 8) + 0x0032;		outw( cmd1, PAGE_IO );		outw( cmd2, PAGE_IO );		page_in_window = page;	}}static map_word elan_104nc_read16(struct map_info *map, unsigned long ofs){	map_word ret;	spin_lock(&elan_104nc_spin);	elan_104nc_page(map, ofs);	ret.x[0] = readw(iomapadr + (ofs & WINDOW_MASK));	spin_unlock(&elan_104nc_spin);	return ret;}static void elan_104nc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len){	while (len) {		unsigned long thislen = len;		if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))			thislen = WINDOW_LENGTH-(from & WINDOW_MASK);				spin_lock(&elan_104nc_spin);		elan_104nc_page(map, from);		memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);		spin_unlock(&elan_104nc_spin);		to += thislen;		from += thislen;		len -= thislen;	}}static void elan_104nc_write16(struct map_info *map, map_word d, unsigned long adr){	spin_lock(&elan_104nc_spin);	elan_104nc_page(map, adr);	writew(d.x[0], iomapadr + (adr & WINDOW_MASK));	spin_unlock(&elan_104nc_spin);}static void elan_104nc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len){		while(len) {		unsigned long thislen = len;		if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))			thislen = WINDOW_LENGTH-(to & WINDOW_MASK);				spin_lock(&elan_104nc_spin);		elan_104nc_page(map, to);		memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);		spin_unlock(&elan_104nc_spin);		to += thislen;		from += thislen;		len -= thislen;	}}static struct map_info elan_104nc_map = {	.name = "ELAN-104NC flash",	.phys = NO_XIP,	.size = 8*1024*1024, /* this must be set to a maximum possible amount			of flash so the cfi probe routines find all			the chips */	.bankwidth = 2,	.read = elan_104nc_read16,	.copy_from = elan_104nc_copy_from,	.write = elan_104nc_write16,	.copy_to = elan_104nc_copy_to};/* MTD device for all of the flash. */static struct mtd_info *all_mtd;static void cleanup_elan_104nc(void){	if( all_mtd ) {		del_mtd_partitions( all_mtd );		map_destroy( all_mtd );	}	iounmap((void *)iomapadr);}int __init init_elan_104nc(void){	/* Urg! We use I/O port 0x22 without request_region()ing it,	   because it's already allocated to the PIC. */  	iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);	if (!iomapadr) {		printk( KERN_ERR"%s: failed to ioremap memory region\n",			elan_104nc_map.name );		return -EIO;	}	printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",		elan_104nc_map.name,		PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,		WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );	elan_104nc_setup();	/* Probe for chip. */	all_mtd = do_map_probe("cfi_probe",  &elan_104nc_map );	if( !all_mtd ) {		cleanup_elan_104nc();		return -ENXIO;	}		all_mtd->owner = THIS_MODULE;	/* Create MTD devices for each partition. */	add_mtd_partitions( all_mtd, partition_info, NUM_PARTITIONS );	return 0;}module_init(init_elan_104nc);module_exit(cleanup_elan_104nc);MODULE_LICENSE("GPL");MODULE_AUTHOR("Arcom Control Systems Ltd.");MODULE_DESCRIPTION("MTD map driver for Arcom Control Systems ELAN-104NC");