1 /* 2 ** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space 3 ** as a block device, to be used as a RAM disk or swap space 4 ** 5 ** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de) 6 ** 7 ** ++Geert: support for zorro_unused_z2ram, better range checking 8 ** ++roman: translate accesses via an array 9 ** ++Milan: support for ChipRAM usage 10 ** ++yambo: converted to 2.0 kernel 11 ** ++yambo: modularized and support added for 3 minor devices including: 12 ** MAJOR MINOR DESCRIPTION 13 ** ----- ----- ---------------------------------------------- 14 ** 37 0 Use Zorro II and Chip ram 15 ** 37 1 Use only Zorro II ram 16 ** 37 2 Use only Chip ram 17 ** 37 4-7 Use memory list entry 1-4 (first is 0) 18 ** ++jskov: support for 1-4th memory list entry. 19 ** 20 ** Permission to use, copy, modify, and distribute this software and its 21 ** documentation for any purpose and without fee is hereby granted, provided 22 ** that the above copyright notice appear in all copies and that both that 23 ** copyright notice and this permission notice appear in supporting 24 ** documentation. This software is provided "as is" without express or 25 ** implied warranty. 26 */ 27 28 #define DEVICE_NAME "Z2RAM" 29 30 #include <linux/major.h> 31 #include <linux/vmalloc.h> 32 #include <linux/init.h> 33 #include <linux/module.h> 34 #include <linux/blkdev.h> 35 #include <linux/bitops.h> 36 37 #include <asm/setup.h> 38 #include <asm/amigahw.h> 39 #include <asm/pgtable.h> 40 41 #include <linux/zorro.h> 42 43 44 extern int m68k_realnum_memory; 45 extern struct mem_info m68k_memory[NUM_MEMINFO]; 46 47 #define Z2MINOR_COMBINED (0) 48 #define Z2MINOR_Z2ONLY (1) 49 #define Z2MINOR_CHIPONLY (2) 50 #define Z2MINOR_MEMLIST1 (4) 51 #define Z2MINOR_MEMLIST2 (5) 52 #define Z2MINOR_MEMLIST3 (6) 53 #define Z2MINOR_MEMLIST4 (7) 54 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */ 55 56 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) 57 58 static u_long *z2ram_map = NULL; 59 static u_long z2ram_size = 0; 60 static int z2_count = 0; 61 static int chip_count = 0; 62 static int list_count = 0; 63 static int current_device = -1; 64 65 static DEFINE_SPINLOCK(z2ram_lock); 66 67 static struct block_device_operations z2_fops; 68 static struct gendisk *z2ram_gendisk; 69 70 static void do_z2_request(struct request_queue *q) 71 { 72 struct request *req; 73 while ((req = elv_next_request(q)) != NULL) { 74 unsigned long start = req->sector << 9; 75 unsigned long len = req->current_nr_sectors << 9; 76 77 if (start + len > z2ram_size) { 78 printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", 79 req->sector, req->current_nr_sectors); 80 end_request(req, 0); 81 continue; 82 } 83 while (len) { 84 unsigned long addr = start & Z2RAM_CHUNKMASK; 85 unsigned long size = Z2RAM_CHUNKSIZE - addr; 86 if (len < size) 87 size = len; 88 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; 89 if (rq_data_dir(req) == READ) 90 memcpy(req->buffer, (char *)addr, size); 91 else 92 memcpy((char *)addr, req->buffer, size); 93 start += size; 94 len -= size; 95 } 96 end_request(req, 1); 97 } 98 } 99 100 static void 101 get_z2ram( void ) 102 { 103 int i; 104 105 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) 106 { 107 if ( test_bit( i, zorro_unused_z2ram ) ) 108 { 109 z2_count++; 110 z2ram_map[ z2ram_size++ ] = 111 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT ); 112 clear_bit( i, zorro_unused_z2ram ); 113 } 114 } 115 116 return; 117 } 118 119 static void 120 get_chipram( void ) 121 { 122 123 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) 124 { 125 chip_count++; 126 z2ram_map[ z2ram_size ] = 127 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); 128 129 if ( z2ram_map[ z2ram_size ] == 0 ) 130 { 131 break; 132 } 133 134 z2ram_size++; 135 } 136 137 return; 138 } 139 140 static int 141 z2_open( struct inode *inode, struct file *filp ) 142 { 143 int device; 144 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * 145 sizeof( z2ram_map[0] ); 146 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * 147 sizeof( z2ram_map[0] ); 148 int rc = -ENOMEM; 149 150 device = iminor(inode); 151 152 if ( current_device != -1 && current_device != device ) 153 { 154 rc = -EBUSY; 155 goto err_out; 156 } 157 158 if ( current_device == -1 ) 159 { 160 z2_count = 0; 161 chip_count = 0; 162 list_count = 0; 163 z2ram_size = 0; 164 165 /* Use a specific list entry. */ 166 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 167 int index = device - Z2MINOR_MEMLIST1 + 1; 168 unsigned long size, paddr, vaddr; 169 170 if (index >= m68k_realnum_memory) { 171 printk( KERN_ERR DEVICE_NAME 172 ": no such entry in z2ram_map\n" ); 173 goto err_out; 174 } 175 176 paddr = m68k_memory[index].addr; 177 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); 178 179 #ifdef __powerpc__ 180 /* FIXME: ioremap doesn't build correct memory tables. */ 181 { 182 vfree(vmalloc (size)); 183 } 184 185 vaddr = (unsigned long) __ioremap (paddr, size, 186 _PAGE_WRITETHRU); 187 188 #else 189 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); 190 #endif 191 z2ram_map = 192 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), 193 GFP_KERNEL); 194 if ( z2ram_map == NULL ) 195 { 196 printk( KERN_ERR DEVICE_NAME 197 ": cannot get mem for z2ram_map\n" ); 198 goto err_out; 199 } 200 201 while (size) { 202 z2ram_map[ z2ram_size++ ] = vaddr; 203 size -= Z2RAM_CHUNKSIZE; 204 vaddr += Z2RAM_CHUNKSIZE; 205 list_count++; 206 } 207 208 if ( z2ram_size != 0 ) 209 printk( KERN_INFO DEVICE_NAME 210 ": using %iK List Entry %d Memory\n", 211 list_count * Z2RAM_CHUNK1024, index ); 212 } else 213 214 switch ( device ) 215 { 216 case Z2MINOR_COMBINED: 217 218 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); 219 if ( z2ram_map == NULL ) 220 { 221 printk( KERN_ERR DEVICE_NAME 222 ": cannot get mem for z2ram_map\n" ); 223 goto err_out; 224 } 225 226 get_z2ram(); 227 get_chipram(); 228 229 if ( z2ram_size != 0 ) 230 printk( KERN_INFO DEVICE_NAME 231 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 232 z2_count * Z2RAM_CHUNK1024, 233 chip_count * Z2RAM_CHUNK1024, 234 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); 235 236 break; 237 238 case Z2MINOR_Z2ONLY: 239 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); 240 if ( z2ram_map == NULL ) 241 { 242 printk( KERN_ERR DEVICE_NAME 243 ": cannot get mem for z2ram_map\n" ); 244 goto err_out; 245 } 246 247 get_z2ram(); 248 249 if ( z2ram_size != 0 ) 250 printk( KERN_INFO DEVICE_NAME 251 ": using %iK of Zorro II RAM\n", 252 z2_count * Z2RAM_CHUNK1024 ); 253 254 break; 255 256 case Z2MINOR_CHIPONLY: 257 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); 258 if ( z2ram_map == NULL ) 259 { 260 printk( KERN_ERR DEVICE_NAME 261 ": cannot get mem for z2ram_map\n" ); 262 goto err_out; 263 } 264 265 get_chipram(); 266 267 if ( z2ram_size != 0 ) 268 printk( KERN_INFO DEVICE_NAME 269 ": using %iK Chip RAM\n", 270 chip_count * Z2RAM_CHUNK1024 ); 271 272 break; 273 274 default: 275 rc = -ENODEV; 276 goto err_out; 277 278 break; 279 } 280 281 if ( z2ram_size == 0 ) 282 { 283 printk( KERN_NOTICE DEVICE_NAME 284 ": no unused ZII/Chip RAM found\n" ); 285 goto err_out_kfree; 286 } 287 288 current_device = device; 289 z2ram_size <<= Z2RAM_CHUNKSHIFT; 290 set_capacity(z2ram_gendisk, z2ram_size >> 9); 291 } 292 293 return 0; 294 295 err_out_kfree: 296 kfree(z2ram_map); 297 err_out: 298 return rc; 299 } 300 301 static int 302 z2_release( struct inode *inode, struct file *filp ) 303 { 304 if ( current_device == -1 ) 305 return 0; 306 307 /* 308 * FIXME: unmap memory 309 */ 310 311 return 0; 312 } 313 314 static struct block_device_operations z2_fops = 315 { 316 .owner = THIS_MODULE, 317 .open = z2_open, 318 .release = z2_release, 319 }; 320 321 static struct kobject *z2_find(dev_t dev, int *part, void *data) 322 { 323 *part = 0; 324 return get_disk(z2ram_gendisk); 325 } 326 327 static struct request_queue *z2_queue; 328 329 static int __init 330 z2_init(void) 331 { 332 int ret; 333 334 if (!MACH_IS_AMIGA) 335 return -ENODEV; 336 337 ret = -EBUSY; 338 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 339 goto err; 340 341 ret = -ENOMEM; 342 z2ram_gendisk = alloc_disk(1); 343 if (!z2ram_gendisk) 344 goto out_disk; 345 346 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock); 347 if (!z2_queue) 348 goto out_queue; 349 350 z2ram_gendisk->major = Z2RAM_MAJOR; 351 z2ram_gendisk->first_minor = 0; 352 z2ram_gendisk->fops = &z2_fops; 353 sprintf(z2ram_gendisk->disk_name, "z2ram"); 354 355 z2ram_gendisk->queue = z2_queue; 356 add_disk(z2ram_gendisk); 357 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, 358 z2_find, NULL, NULL); 359 360 return 0; 361 362 out_queue: 363 put_disk(z2ram_gendisk); 364 out_disk: 365 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 366 err: 367 return ret; 368 } 369 370 static void __exit z2_exit(void) 371 { 372 int i, j; 373 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256); 374 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 375 del_gendisk(z2ram_gendisk); 376 put_disk(z2ram_gendisk); 377 blk_cleanup_queue(z2_queue); 378 379 if ( current_device != -1 ) 380 { 381 i = 0; 382 383 for ( j = 0 ; j < z2_count; j++ ) 384 { 385 set_bit( i++, zorro_unused_z2ram ); 386 } 387 388 for ( j = 0 ; j < chip_count; j++ ) 389 { 390 if ( z2ram_map[ i ] ) 391 { 392 amiga_chip_free( (void *) z2ram_map[ i++ ] ); 393 } 394 } 395 396 if ( z2ram_map != NULL ) 397 { 398 kfree( z2ram_map ); 399 } 400 } 401 402 return; 403 } 404 405 module_init(z2_init); 406 module_exit(z2_exit); 407 MODULE_LICENSE("GPL"); 408