229 lines
6.1 KiB
C
229 lines
6.1 KiB
C
/* 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 1.25 2004/11/28 09:40:39 dwmw2 Exp $
|
|
|
|
The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16
|
|
mode. 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 separate
|
|
MTD devices.
|
|
|
|
Linux thinks that the I/O port is used by the PIC and hence check_region() will
|
|
always 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 2
|
|
|
|
static volatile int page_in_window = -1; // Current page in window.
|
|
static void __iomem *iomapadr;
|
|
static DEFINE_SPINLOCK(elan_104nc_spin);
|
|
|
|
/* 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 1
|
|
|
|
static 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(iomapadr);
|
|
}
|
|
|
|
static 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 = 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");
|