239 lines
6.3 KiB
C
239 lines
6.3 KiB
C
/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
|
|
SBC-GXm and SBC-GX1 series boards.
|
|
|
|
Copyright (C) 2001 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: sbc_gxx.c,v 1.35 2005/11/07 11:14:28 gleixner Exp $
|
|
|
|
The SBC-MediaGX / SBC-GXx has up to 16 MiB of
|
|
Intel StrataFlash (28F320/28F640) in x8 mode.
|
|
|
|
This driver uses the CFI probe and Intel Extended Command Set drivers.
|
|
|
|
The flash is accessed as follows:
|
|
|
|
16 KiB memory window at 0xdc000-0xdffff
|
|
|
|
Two IO address locations for paging
|
|
|
|
0x258
|
|
bit 0-7: address bit 14-21
|
|
0x259
|
|
bit 0-1: address bit 22-23
|
|
bit 7: 0 - reset/powered down
|
|
1 - device enabled
|
|
|
|
The single flash device is divided into 3 partition which appear as
|
|
separate MTD devices.
|
|
|
|
25/04/2001 AJL (Arcom) Modified signon strings and partition sizes
|
|
(to support bzImages up to 638KiB-ish)
|
|
*/
|
|
|
|
// Includes
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/init.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
// Defines
|
|
|
|
// - Hardware specific
|
|
|
|
#define WINDOW_START 0xdc000
|
|
|
|
/* Number of bits in offset. */
|
|
#define WINDOW_SHIFT 14
|
|
#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
|
|
|
|
/* The bits for the offset into the window. */
|
|
#define WINDOW_MASK (WINDOW_LENGTH-1)
|
|
#define PAGE_IO 0x258
|
|
#define PAGE_IO_SIZE 2
|
|
|
|
/* bit 7 of 0x259 must be 1 to enable device. */
|
|
#define DEVICE_ENABLE 0x8000
|
|
|
|
// - Flash / Partition sizing
|
|
|
|
#define MAX_SIZE_KiB 16384
|
|
#define BOOT_PARTITION_SIZE_KiB 768
|
|
#define DATA_PARTITION_SIZE_KiB 1280
|
|
#define APP_PARTITION_SIZE_KiB 6144
|
|
|
|
// Globals
|
|
|
|
static volatile int page_in_window = -1; // Current page in window.
|
|
static void __iomem *iomapadr;
|
|
static DEFINE_SPINLOCK(sbc_gxx_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 = "SBC-GXx flash boot partition",
|
|
.offset = 0,
|
|
.size = BOOT_PARTITION_SIZE_KiB*1024 },
|
|
{ .name = "SBC-GXx flash data partition",
|
|
.offset = BOOT_PARTITION_SIZE_KiB*1024,
|
|
.size = (DATA_PARTITION_SIZE_KiB)*1024 },
|
|
{ .name = "SBC-GXx flash application partition",
|
|
.offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
|
|
};
|
|
|
|
#define NUM_PARTITIONS 3
|
|
|
|
static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
|
|
{
|
|
unsigned long page = ofs >> WINDOW_SHIFT;
|
|
|
|
if( page!=page_in_window ) {
|
|
outw( page | DEVICE_ENABLE, PAGE_IO );
|
|
page_in_window = page;
|
|
}
|
|
}
|
|
|
|
|
|
static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
|
|
{
|
|
map_word ret;
|
|
spin_lock(&sbc_gxx_spin);
|
|
sbc_gxx_page(map, ofs);
|
|
ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
|
|
spin_unlock(&sbc_gxx_spin);
|
|
return ret;
|
|
}
|
|
|
|
static void sbc_gxx_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(&sbc_gxx_spin);
|
|
sbc_gxx_page(map, from);
|
|
memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
|
|
spin_unlock(&sbc_gxx_spin);
|
|
to += thislen;
|
|
from += thislen;
|
|
len -= thislen;
|
|
}
|
|
}
|
|
|
|
static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
|
|
{
|
|
spin_lock(&sbc_gxx_spin);
|
|
sbc_gxx_page(map, adr);
|
|
writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
|
|
spin_unlock(&sbc_gxx_spin);
|
|
}
|
|
|
|
static void sbc_gxx_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(&sbc_gxx_spin);
|
|
sbc_gxx_page(map, to);
|
|
memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
|
|
spin_unlock(&sbc_gxx_spin);
|
|
to += thislen;
|
|
from += thislen;
|
|
len -= thislen;
|
|
}
|
|
}
|
|
|
|
static struct map_info sbc_gxx_map = {
|
|
.name = "SBC-GXx flash",
|
|
.phys = NO_XIP,
|
|
.size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
|
|
of flash so the cfi probe routines find all
|
|
the chips */
|
|
.bankwidth = 1,
|
|
.read = sbc_gxx_read8,
|
|
.copy_from = sbc_gxx_copy_from,
|
|
.write = sbc_gxx_write8,
|
|
.copy_to = sbc_gxx_copy_to
|
|
};
|
|
|
|
/* MTD device for all of the flash. */
|
|
static struct mtd_info *all_mtd;
|
|
|
|
static void cleanup_sbc_gxx(void)
|
|
{
|
|
if( all_mtd ) {
|
|
del_mtd_partitions( all_mtd );
|
|
map_destroy( all_mtd );
|
|
}
|
|
|
|
iounmap(iomapadr);
|
|
release_region(PAGE_IO,PAGE_IO_SIZE);
|
|
}
|
|
|
|
static int __init init_sbc_gxx(void)
|
|
{
|
|
iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
|
|
if (!iomapadr) {
|
|
printk( KERN_ERR"%s: failed to ioremap memory region\n",
|
|
sbc_gxx_map.name );
|
|
return -EIO;
|
|
}
|
|
|
|
if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
|
|
printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
|
|
sbc_gxx_map.name,
|
|
PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
|
|
iounmap(iomapadr);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
|
|
printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
|
|
sbc_gxx_map.name,
|
|
PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
|
|
WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
|
|
|
|
/* Probe for chip. */
|
|
all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
|
|
if( !all_mtd ) {
|
|
cleanup_sbc_gxx();
|
|
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_sbc_gxx);
|
|
module_exit(cleanup_sbc_gxx);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arcom Control Systems Ltd.");
|
|
MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");
|