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 1.1.1.1 2008/10/15 03:26:35 james26_jang 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 (__u8*)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