1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
/* elan-104nc.c -- MTD map driver for Arcom Control Systems ELAN-104NC
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Copyright (C) 2000 Arcom Control System Ltd
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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$Id: elan-104nc.c,v 1.25 2004/11/28 09:40:39 dwmw2 Exp $
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The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16
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mode. This drivers uses the CFI probe and Intel Extended Command Set drivers.
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The flash is accessed as follows:
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32 kbyte memory window at 0xb0000-0xb7fff
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16 bit I/O port (0x22) for some sort of paging.
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The single flash device is divided into 3 partition which appear as separate
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MTD devices.
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Linux thinks that the I/O port is used by the PIC and hence check_region() will
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always fail. So we don't do it. I just hope it doesn't break anything.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#define WINDOW_START 0xb0000
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/* Number of bits in offset. */
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#define WINDOW_SHIFT 15
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#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
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/* The bits for the offset into the window. */
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#define WINDOW_MASK (WINDOW_LENGTH-1)
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#define PAGE_IO 0x22
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#define PAGE_IO_SIZE 2
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static volatile int page_in_window = -1; // Current page in window.
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static void __iomem *iomapadr;
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static DEFINE_SPINLOCK(elan_104nc_spin);
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/* partition_info gives details on the logical partitions that the split the
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* single flash device into. If the size if zero we use up to the end of the
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* device. */
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static struct mtd_partition partition_info[]={
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{ .name = "ELAN-104NC flash boot partition",
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.offset = 0,
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.size = 640*1024 },
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{ .name = "ELAN-104NC flash partition 1",
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.offset = 640*1024,
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.size = 896*1024 },
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{ .name = "ELAN-104NC flash partition 2",
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.offset = (640+896)*1024 }
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};
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#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
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/*
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* If no idea what is going on here. This is taken from the FlashFX stuff.
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*/
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#define ROMCS 1
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static inline void elan_104nc_setup(void)
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{
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u16 t;
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outw( 0x0023 + ROMCS*2, PAGE_IO );
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t=inb( PAGE_IO+1 );
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t=(t & 0xf9) | 0x04;
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outw( ((0x0023 + ROMCS*2) | (t << 8)), PAGE_IO );
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}
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static inline void elan_104nc_page(struct map_info *map, unsigned long ofs)
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{
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unsigned long page = ofs >> WINDOW_SHIFT;
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if( page!=page_in_window ) {
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int cmd1;
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int cmd2;
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cmd1=(page & 0x700) + 0x0833 + ROMCS*0x4000;
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cmd2=((page & 0xff) << 8) + 0x0032;
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outw( cmd1, PAGE_IO );
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outw( cmd2, PAGE_IO );
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page_in_window = page;
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}
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}
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static map_word elan_104nc_read16(struct map_info *map, unsigned long ofs)
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{
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map_word ret;
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spin_lock(&elan_104nc_spin);
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elan_104nc_page(map, ofs);
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ret.x[0] = readw(iomapadr + (ofs & WINDOW_MASK));
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spin_unlock(&elan_104nc_spin);
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return ret;
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}
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static void elan_104nc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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while (len) {
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unsigned long thislen = len;
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if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
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thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
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spin_lock(&elan_104nc_spin);
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elan_104nc_page(map, from);
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memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
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spin_unlock(&elan_104nc_spin);
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to += thislen;
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from += thislen;
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len -= thislen;
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}
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}
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static void elan_104nc_write16(struct map_info *map, map_word d, unsigned long adr)
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{
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spin_lock(&elan_104nc_spin);
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elan_104nc_page(map, adr);
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writew(d.x[0], iomapadr + (adr & WINDOW_MASK));
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spin_unlock(&elan_104nc_spin);
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}
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static void elan_104nc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
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{
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while(len) {
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unsigned long thislen = len;
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if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
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thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
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spin_lock(&elan_104nc_spin);
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elan_104nc_page(map, to);
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memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
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spin_unlock(&elan_104nc_spin);
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to += thislen;
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from += thislen;
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len -= thislen;
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}
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}
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static struct map_info elan_104nc_map = {
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.name = "ELAN-104NC flash",
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.phys = NO_XIP,
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.size = 8*1024*1024, /* this must be set to a maximum possible amount
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of flash so the cfi probe routines find all
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the chips */
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.bankwidth = 2,
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.read = elan_104nc_read16,
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.copy_from = elan_104nc_copy_from,
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.write = elan_104nc_write16,
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.copy_to = elan_104nc_copy_to
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};
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/* MTD device for all of the flash. */
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static struct mtd_info *all_mtd;
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static void cleanup_elan_104nc(void)
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{
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if( all_mtd ) {
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del_mtd_partitions( all_mtd );
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map_destroy( all_mtd );
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}
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iounmap(iomapadr);
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}
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static int __init init_elan_104nc(void)
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{
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/* Urg! We use I/O port 0x22 without request_region()ing it,
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because it's already allocated to the PIC. */
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iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
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if (!iomapadr) {
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printk( KERN_ERR"%s: failed to ioremap memory region\n",
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elan_104nc_map.name );
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return -EIO;
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}
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printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
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elan_104nc_map.name,
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PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
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WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
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elan_104nc_setup();
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/* Probe for chip. */
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all_mtd = do_map_probe("cfi_probe", &elan_104nc_map );
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if( !all_mtd ) {
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cleanup_elan_104nc();
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return -ENXIO;
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}
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all_mtd->owner = THIS_MODULE;
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/* Create MTD devices for each partition. */
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add_mtd_partitions( all_mtd, partition_info, NUM_PARTITIONS );
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return 0;
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}
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module_init(init_elan_104nc);
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module_exit(cleanup_elan_104nc);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arcom Control Systems Ltd.");
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MODULE_DESCRIPTION("MTD map driver for Arcom Control Systems ELAN-104NC");
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