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 z2_open(struct block_device *bdev, fmode_t mode) 141 { 142 int device; 143 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * 144 sizeof( z2ram_map[0] ); 145 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * 146 sizeof( z2ram_map[0] ); 147 int rc = -ENOMEM; 148 149 device = MINOR(bdev->bd_dev); 150 151 if ( current_device != -1 && current_device != device ) 152 { 153 rc = -EBUSY; 154 goto err_out; 155 } 156 157 if ( current_device == -1 ) 158 { 159 z2_count = 0; 160 chip_count = 0; 161 list_count = 0; 162 z2ram_size = 0; 163 164 /* Use a specific list entry. */ 165 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 166 int index = device - Z2MINOR_MEMLIST1 + 1; 167 unsigned long size, paddr, vaddr; 168 169 if (index >= m68k_realnum_memory) { 170 printk( KERN_ERR DEVICE_NAME 171 ": no such entry in z2ram_map\n" ); 172 goto err_out; 173 } 174 175 paddr = m68k_memory[index].addr; 176 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); 177 178 #ifdef __powerpc__ 179 /* FIXME: ioremap doesn't build correct memory tables. */ 180 { 181 vfree(vmalloc (size)); 182 } 183 184 vaddr = (unsigned long) __ioremap (paddr, size, 185 _PAGE_WRITETHRU); 186 187 #else 188 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); 189 #endif 190 z2ram_map = 191 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), 192 GFP_KERNEL); 193 if ( z2ram_map == NULL ) 194 { 195 printk( KERN_ERR DEVICE_NAME 196 ": cannot get mem for z2ram_map\n" ); 197 goto err_out; 198 } 199 200 while (size) { 201 z2ram_map[ z2ram_size++ ] = vaddr; 202 size -= Z2RAM_CHUNKSIZE; 203 vaddr += Z2RAM_CHUNKSIZE; 204 list_count++; 205 } 206 207 if ( z2ram_size != 0 ) 208 printk( KERN_INFO DEVICE_NAME 209 ": using %iK List Entry %d Memory\n", 210 list_count * Z2RAM_CHUNK1024, index ); 211 } else 212 213 switch ( device ) 214 { 215 case Z2MINOR_COMBINED: 216 217 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); 218 if ( z2ram_map == NULL ) 219 { 220 printk( KERN_ERR DEVICE_NAME 221 ": cannot get mem for z2ram_map\n" ); 222 goto err_out; 223 } 224 225 get_z2ram(); 226 get_chipram(); 227 228 if ( z2ram_size != 0 ) 229 printk( KERN_INFO DEVICE_NAME 230 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 231 z2_count * Z2RAM_CHUNK1024, 232 chip_count * Z2RAM_CHUNK1024, 233 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); 234 235 break; 236 237 case Z2MINOR_Z2ONLY: 238 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); 239 if ( z2ram_map == NULL ) 240 { 241 printk( KERN_ERR DEVICE_NAME 242 ": cannot get mem for z2ram_map\n" ); 243 goto err_out; 244 } 245 246 get_z2ram(); 247 248 if ( z2ram_size != 0 ) 249 printk( KERN_INFO DEVICE_NAME 250 ": using %iK of Zorro II RAM\n", 251 z2_count * Z2RAM_CHUNK1024 ); 252 253 break; 254 255 case Z2MINOR_CHIPONLY: 256 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); 257 if ( z2ram_map == NULL ) 258 { 259 printk( KERN_ERR DEVICE_NAME 260 ": cannot get mem for z2ram_map\n" ); 261 goto err_out; 262 } 263 264 get_chipram(); 265 266 if ( z2ram_size != 0 ) 267 printk( KERN_INFO DEVICE_NAME 268 ": using %iK Chip RAM\n", 269 chip_count * Z2RAM_CHUNK1024 ); 270 271 break; 272 273 default: 274 rc = -ENODEV; 275 goto err_out; 276 277 break; 278 } 279 280 if ( z2ram_size == 0 ) 281 { 282 printk( KERN_NOTICE DEVICE_NAME 283 ": no unused ZII/Chip RAM found\n" ); 284 goto err_out_kfree; 285 } 286 287 current_device = device; 288 z2ram_size <<= Z2RAM_CHUNKSHIFT; 289 set_capacity(z2ram_gendisk, z2ram_size >> 9); 290 } 291 292 return 0; 293 294 err_out_kfree: 295 kfree(z2ram_map); 296 err_out: 297 return rc; 298 } 299 300 static int 301 z2_release(struct gendisk *disk, fmode_t mode) 302 { 303 if ( current_device == -1 ) 304 return 0; 305 306 /* 307 * FIXME: unmap memory 308 */ 309 310 return 0; 311 } 312 313 static struct block_device_operations z2_fops = 314 { 315 .owner = THIS_MODULE, 316 .open = z2_open, 317 .release = z2_release, 318 }; 319 320 static struct kobject *z2_find(dev_t dev, int *part, void *data) 321 { 322 *part = 0; 323 return get_disk(z2ram_gendisk); 324 } 325 326 static struct request_queue *z2_queue; 327 328 static int __init 329 z2_init(void) 330 { 331 int ret; 332 333 if (!MACH_IS_AMIGA) 334 return -ENODEV; 335 336 ret = -EBUSY; 337 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 338 goto err; 339 340 ret = -ENOMEM; 341 z2ram_gendisk = alloc_disk(1); 342 if (!z2ram_gendisk) 343 goto out_disk; 344 345 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock); 346 if (!z2_queue) 347 goto out_queue; 348 349 z2ram_gendisk->major = Z2RAM_MAJOR; 350 z2ram_gendisk->first_minor = 0; 351 z2ram_gendisk->fops = &z2_fops; 352 sprintf(z2ram_gendisk->disk_name, "z2ram"); 353 354 z2ram_gendisk->queue = z2_queue; 355 add_disk(z2ram_gendisk); 356 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, 357 z2_find, NULL, NULL); 358 359 return 0; 360 361 out_queue: 362 put_disk(z2ram_gendisk); 363 out_disk: 364 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 365 err: 366 return ret; 367 } 368 369 static void __exit z2_exit(void) 370 { 371 int i, j; 372 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256); 373 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 374 del_gendisk(z2ram_gendisk); 375 put_disk(z2ram_gendisk); 376 blk_cleanup_queue(z2_queue); 377 378 if ( current_device != -1 ) 379 { 380 i = 0; 381 382 for ( j = 0 ; j < z2_count; j++ ) 383 { 384 set_bit( i++, zorro_unused_z2ram ); 385 } 386 387 for ( j = 0 ; j < chip_count; j++ ) 388 { 389 if ( z2ram_map[ i ] ) 390 { 391 amiga_chip_free( (void *) z2ram_map[ i++ ] ); 392 } 393 } 394 395 if ( z2ram_map != NULL ) 396 { 397 kfree( z2ram_map ); 398 } 399 } 400 401 return; 402 } 403 404 module_init(z2_init); 405 module_exit(z2_exit); 406 MODULE_LICENSE("GPL"); 407