linux-old/drivers/mtd/maps/elan-104nc.c
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   1/* elan-104nc.c -- MTD map driver for Arcom Control Systems ELAN-104NC
   2 
   3   Copyright (C) 2000 Arcom Control System Ltd
   4 
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9 
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14 
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  18
  19   $Id: elan-104nc.c,v 1.13 2002/02/13 15:30:20 dwmw2 Exp $
  20
  21The ELAN-104NC has up to 8 Mibyte of Intel StrataFlash (28F320/28F640) in x16
  22mode.  This drivers uses the CFI probe and Intel Extended Command Set drivers.
  23
  24The flash is accessed as follows:
  25
  26   32 kbyte memory window at 0xb0000-0xb7fff
  27   
  28   16 bit I/O port (0x22) for some sort of paging.
  29
  30The single flash device is divided into 3 partition which appear as seperate
  31MTD devices.
  32
  33Linux thinks that the I/O port is used by the PIC and hence check_region() will
  34always fail.  So we don't do it.  I just hope it doesn't break anything.
  35*/
  36#include <linux/module.h>
  37#include <linux/slab.h>
  38#include <linux/ioport.h>
  39#include <linux/init.h>
  40#include <asm/io.h>
  41
  42#include <linux/mtd/map.h>
  43#include <linux/mtd/partitions.h>
  44
  45#define WINDOW_START 0xb0000
  46/* Number of bits in offset. */
  47#define WINDOW_SHIFT 15
  48#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
  49/* The bits for the offset into the window. */
  50#define WINDOW_MASK (WINDOW_LENGTH-1)
  51#define PAGE_IO 0x22
  52#define PAGE_IO_SIZE 2
  53
  54static volatile int page_in_window = -1; // Current page in window.
  55static unsigned long iomapadr;
  56static spinlock_t elan_104nc_spin = SPIN_LOCK_UNLOCKED;
  57
  58/* partition_info gives details on the logical partitions that the split the 
  59 * single flash device into. If the size if zero we use up to the end of the
  60 * device. */
  61static struct mtd_partition partition_info[]={
  62    { name: "ELAN-104NC flash boot partition", 
  63      offset: 0, 
  64      size: 640*1024 },
  65    { name: "ELAN-104NC flash partition 1", 
  66      offset: 640*1024, 
  67      size: 896*1024 },
  68    { name: "ELAN-104NC flash partition 2", 
  69      offset: (640+896)*1024 }
  70};
  71#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
  72
  73/*
  74 * If no idea what is going on here.  This is taken from the FlashFX stuff.
  75 */
  76#define ROMCS 1
  77
  78static inline void elan_104nc_setup(void)
  79{
  80    u16 t;
  81
  82    outw( 0x0023 + ROMCS*2, PAGE_IO );
  83    t=inb( PAGE_IO+1 );
  84
  85    t=(t & 0xf9) | 0x04;
  86
  87    outw( ((0x0023 + ROMCS*2) | (t << 8)), PAGE_IO );
  88}
  89
  90static inline void elan_104nc_page(struct map_info *map, unsigned long ofs)
  91{
  92        unsigned long page = ofs >> WINDOW_SHIFT;
  93       
  94        if( page!=page_in_window ) {
  95                int cmd1;
  96                int cmd2;
  97
  98                cmd1=(page & 0x700) + 0x0833 + ROMCS*0x4000;
  99                cmd2=((page & 0xff) << 8) + 0x0032;
 100
 101                outw( cmd1, PAGE_IO );
 102                outw( cmd2, PAGE_IO );
 103
 104                page_in_window = page;
 105        }
 106}
 107
 108
 109static __u8 elan_104nc_read8(struct map_info *map, unsigned long ofs)
 110{
 111        __u8 ret;
 112        spin_lock(&elan_104nc_spin);
 113        elan_104nc_page(map, ofs);
 114        ret = readb(iomapadr + (ofs & WINDOW_MASK));
 115        spin_unlock(&elan_104nc_spin);
 116        return ret;
 117}
 118
 119static __u16 elan_104nc_read16(struct map_info *map, unsigned long ofs)
 120{
 121        __u16 ret;
 122        spin_lock(&elan_104nc_spin);
 123        elan_104nc_page(map, ofs);
 124        ret = readw(iomapadr + (ofs & WINDOW_MASK));
 125        spin_unlock(&elan_104nc_spin);
 126        return ret;
 127}
 128
 129static __u32 elan_104nc_read32(struct map_info *map, unsigned long ofs)
 130{
 131        __u32 ret;
 132        spin_lock(&elan_104nc_spin);
 133        elan_104nc_page(map, ofs);
 134        ret = readl(iomapadr + (ofs & WINDOW_MASK));
 135        spin_unlock(&elan_104nc_spin);
 136        return ret;
 137}
 138
 139static void elan_104nc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 140{
 141        while(len) {
 142                unsigned long thislen = len;
 143                if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
 144                        thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
 145                
 146                spin_lock(&elan_104nc_spin);
 147                elan_104nc_page(map, from);
 148                memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
 149                spin_unlock(&elan_104nc_spin);
 150                to += thislen;
 151                from += thislen;
 152                len -= thislen;
 153        }
 154}
 155
 156static void elan_104nc_write8(struct map_info *map, __u8 d, unsigned long adr)
 157{
 158        spin_lock(&elan_104nc_spin);
 159        elan_104nc_page(map, adr);
 160        writeb(d, iomapadr + (adr & WINDOW_MASK));
 161        spin_unlock(&elan_104nc_spin);
 162}
 163
 164static void elan_104nc_write16(struct map_info *map, __u16 d, unsigned long adr)
 165{
 166        spin_lock(&elan_104nc_spin);
 167        elan_104nc_page(map, adr);
 168        writew(d, iomapadr + (adr & WINDOW_MASK));
 169        spin_unlock(&elan_104nc_spin);
 170}
 171
 172static void elan_104nc_write32(struct map_info *map, __u32 d, unsigned long adr)
 173{
 174        spin_lock(&elan_104nc_spin);
 175        elan_104nc_page(map, adr);
 176        writel(d, iomapadr + (adr & WINDOW_MASK));
 177        spin_unlock(&elan_104nc_spin);
 178}
 179
 180static void elan_104nc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 181{       
 182        while(len) {
 183                unsigned long thislen = len;
 184                if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
 185                        thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
 186                
 187                spin_lock(&elan_104nc_spin);
 188                elan_104nc_page(map, to);
 189                memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
 190                spin_unlock(&elan_104nc_spin);
 191                to += thislen;
 192                from += thislen;
 193                len -= thislen;
 194        }
 195}
 196
 197static struct map_info elan_104nc_map = {
 198        name: "ELAN-104NC flash",
 199        size: 8*1024*1024, /* this must be set to a maximum possible amount
 200                        of flash so the cfi probe routines find all
 201                        the chips */
 202        buswidth: 2,
 203        read8: elan_104nc_read8,
 204        read16: elan_104nc_read16,
 205        read32: elan_104nc_read32,
 206        copy_from: elan_104nc_copy_from,
 207        write8: elan_104nc_write8,
 208        write16: elan_104nc_write16,
 209        write32: elan_104nc_write32,
 210        copy_to: elan_104nc_copy_to
 211};
 212
 213/* MTD device for all of the flash. */
 214static struct mtd_info *all_mtd;
 215
 216static void cleanup_elan_104nc(void)
 217{
 218        if( all_mtd ) {
 219                del_mtd_partitions( all_mtd );
 220                map_destroy( all_mtd );
 221        }
 222
 223        iounmap((void *)iomapadr);
 224        release_region(PAGE_IO,PAGE_IO_SIZE);
 225}
 226
 227int __init init_elan_104nc(void)
 228{
 229        /* Urg! We use I/O port 0x22 without request_region()ing it */
 230        /*
 231        if (check_region(PAGE_IO,PAGE_IO_SIZE) != 0) {
 232                printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
 233                        elan_104nc_map.name,
 234                        PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
 235                return -EAGAIN;
 236        }
 237        */
 238        iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);
 239        if (!iomapadr) {
 240                printk( KERN_ERR"%s: failed to ioremap memory region\n",
 241                        elan_104nc_map.name );
 242                return -EIO;
 243        }
 244
 245        /*
 246        request_region( PAGE_IO, PAGE_IO_SIZE, "ELAN-104NC flash" );
 247        */
 248
 249        printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
 250                elan_104nc_map.name,
 251                PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
 252                WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
 253
 254        elan_104nc_setup();
 255
 256        /* Probe for chip. */
 257        all_mtd = do_map_probe("cfi_probe",  &elan_104nc_map );
 258        if( !all_mtd ) {
 259                cleanup_elan_104nc();
 260                return -ENXIO;
 261        }
 262        
 263        all_mtd->module=THIS_MODULE;
 264
 265        /* Create MTD devices for each partition. */
 266        add_mtd_partitions( all_mtd, partition_info, NUM_PARTITIONS );
 267
 268        return 0;
 269}
 270
 271module_init(init_elan_104nc);
 272module_exit(cleanup_elan_104nc);
 273
 274
 275MODULE_LICENSE("GPL");
 276MODULE_AUTHOR("Arcom Control Systems Ltd.");
 277MODULE_DESCRIPTION("MTD map driver for Arcom Control Systems ELAN-104NC");
 278