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 #include <linux/mutex.h> 37 #include <linux/slab.h> 38 39 #include <asm/setup.h> 40 #include <asm/amigahw.h> 41 #include <asm/pgtable.h> 42 43 #include <linux/zorro.h> 44 45 46 extern int m68k_realnum_memory; 47 extern struct mem_info m68k_memory[NUM_MEMINFO]; 48 49 #define Z2MINOR_COMBINED (0) 50 #define Z2MINOR_Z2ONLY (1) 51 #define Z2MINOR_CHIPONLY (2) 52 #define Z2MINOR_MEMLIST1 (4) 53 #define Z2MINOR_MEMLIST2 (5) 54 #define Z2MINOR_MEMLIST3 (6) 55 #define Z2MINOR_MEMLIST4 (7) 56 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */ 57 58 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) 59 60 static DEFINE_MUTEX(z2ram_mutex); 61 static u_long *z2ram_map = NULL; 62 static u_long z2ram_size = 0; 63 static int z2_count = 0; 64 static int chip_count = 0; 65 static int list_count = 0; 66 static int current_device = -1; 67 68 static DEFINE_SPINLOCK(z2ram_lock); 69 70 static struct gendisk *z2ram_gendisk; 71 72 static void do_z2_request(struct request_queue *q) 73 { 74 struct request *req; 75 76 req = blk_fetch_request(q); 77 while (req) { 78 unsigned long start = blk_rq_pos(req) << 9; 79 unsigned long len = blk_rq_cur_bytes(req); 80 int err = 0; 81 82 if (start + len > z2ram_size) { 83 printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", 84 blk_rq_pos(req), blk_rq_cur_sectors(req)); 85 err = -EIO; 86 goto done; 87 } 88 while (len) { 89 unsigned long addr = start & Z2RAM_CHUNKMASK; 90 unsigned long size = Z2RAM_CHUNKSIZE - addr; 91 if (len < size) 92 size = len; 93 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; 94 if (rq_data_dir(req) == READ) 95 memcpy(req->buffer, (char *)addr, size); 96 else 97 memcpy((char *)addr, req->buffer, size); 98 start += size; 99 len -= size; 100 } 101 done: 102 if (!__blk_end_request_cur(req, err)) 103 req = blk_fetch_request(q); 104 } 105 } 106 107 static void 108 get_z2ram( void ) 109 { 110 int i; 111 112 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) 113 { 114 if ( test_bit( i, zorro_unused_z2ram ) ) 115 { 116 z2_count++; 117 z2ram_map[ z2ram_size++ ] = 118 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT ); 119 clear_bit( i, zorro_unused_z2ram ); 120 } 121 } 122 123 return; 124 } 125 126 static void 127 get_chipram( void ) 128 { 129 130 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) 131 { 132 chip_count++; 133 z2ram_map[ z2ram_size ] = 134 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); 135 136 if ( z2ram_map[ z2ram_size ] == 0 ) 137 { 138 break; 139 } 140 141 z2ram_size++; 142 } 143 144 return; 145 } 146 147 static int z2_open(struct block_device *bdev, fmode_t mode) 148 { 149 int device; 150 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * 151 sizeof( z2ram_map[0] ); 152 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * 153 sizeof( z2ram_map[0] ); 154 int rc = -ENOMEM; 155 156 device = MINOR(bdev->bd_dev); 157 158 mutex_lock(&z2ram_mutex); 159 if ( current_device != -1 && current_device != device ) 160 { 161 rc = -EBUSY; 162 goto err_out; 163 } 164 165 if ( current_device == -1 ) 166 { 167 z2_count = 0; 168 chip_count = 0; 169 list_count = 0; 170 z2ram_size = 0; 171 172 /* Use a specific list entry. */ 173 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 174 int index = device - Z2MINOR_MEMLIST1 + 1; 175 unsigned long size, paddr, vaddr; 176 177 if (index >= m68k_realnum_memory) { 178 printk( KERN_ERR DEVICE_NAME 179 ": no such entry in z2ram_map\n" ); 180 goto err_out; 181 } 182 183 paddr = m68k_memory[index].addr; 184 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); 185 186 #ifdef __powerpc__ 187 /* FIXME: ioremap doesn't build correct memory tables. */ 188 { 189 vfree(vmalloc (size)); 190 } 191 192 vaddr = (unsigned long) __ioremap (paddr, size, 193 _PAGE_WRITETHRU); 194 195 #else 196 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); 197 #endif 198 z2ram_map = 199 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), 200 GFP_KERNEL); 201 if ( z2ram_map == NULL ) 202 { 203 printk( KERN_ERR DEVICE_NAME 204 ": cannot get mem for z2ram_map\n" ); 205 goto err_out; 206 } 207 208 while (size) { 209 z2ram_map[ z2ram_size++ ] = vaddr; 210 size -= Z2RAM_CHUNKSIZE; 211 vaddr += Z2RAM_CHUNKSIZE; 212 list_count++; 213 } 214 215 if ( z2ram_size != 0 ) 216 printk( KERN_INFO DEVICE_NAME 217 ": using %iK List Entry %d Memory\n", 218 list_count * Z2RAM_CHUNK1024, index ); 219 } else 220 221 switch ( device ) 222 { 223 case Z2MINOR_COMBINED: 224 225 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); 226 if ( z2ram_map == NULL ) 227 { 228 printk( KERN_ERR DEVICE_NAME 229 ": cannot get mem for z2ram_map\n" ); 230 goto err_out; 231 } 232 233 get_z2ram(); 234 get_chipram(); 235 236 if ( z2ram_size != 0 ) 237 printk( KERN_INFO DEVICE_NAME 238 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 239 z2_count * Z2RAM_CHUNK1024, 240 chip_count * Z2RAM_CHUNK1024, 241 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); 242 243 break; 244 245 case Z2MINOR_Z2ONLY: 246 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); 247 if ( z2ram_map == NULL ) 248 { 249 printk( KERN_ERR DEVICE_NAME 250 ": cannot get mem for z2ram_map\n" ); 251 goto err_out; 252 } 253 254 get_z2ram(); 255 256 if ( z2ram_size != 0 ) 257 printk( KERN_INFO DEVICE_NAME 258 ": using %iK of Zorro II RAM\n", 259 z2_count * Z2RAM_CHUNK1024 ); 260 261 break; 262 263 case Z2MINOR_CHIPONLY: 264 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); 265 if ( z2ram_map == NULL ) 266 { 267 printk( KERN_ERR DEVICE_NAME 268 ": cannot get mem for z2ram_map\n" ); 269 goto err_out; 270 } 271 272 get_chipram(); 273 274 if ( z2ram_size != 0 ) 275 printk( KERN_INFO DEVICE_NAME 276 ": using %iK Chip RAM\n", 277 chip_count * Z2RAM_CHUNK1024 ); 278 279 break; 280 281 default: 282 rc = -ENODEV; 283 goto err_out; 284 285 break; 286 } 287 288 if ( z2ram_size == 0 ) 289 { 290 printk( KERN_NOTICE DEVICE_NAME 291 ": no unused ZII/Chip RAM found\n" ); 292 goto err_out_kfree; 293 } 294 295 current_device = device; 296 z2ram_size <<= Z2RAM_CHUNKSHIFT; 297 set_capacity(z2ram_gendisk, z2ram_size >> 9); 298 } 299 300 mutex_unlock(&z2ram_mutex); 301 return 0; 302 303 err_out_kfree: 304 kfree(z2ram_map); 305 err_out: 306 mutex_unlock(&z2ram_mutex); 307 return rc; 308 } 309 310 static int 311 z2_release(struct gendisk *disk, fmode_t mode) 312 { 313 mutex_lock(&z2ram_mutex); 314 if ( current_device == -1 ) { 315 mutex_unlock(&z2ram_mutex); 316 return 0; 317 } 318 mutex_unlock(&z2ram_mutex); 319 /* 320 * FIXME: unmap memory 321 */ 322 323 return 0; 324 } 325 326 static const struct block_device_operations z2_fops = 327 { 328 .owner = THIS_MODULE, 329 .open = z2_open, 330 .release = z2_release, 331 }; 332 333 static struct kobject *z2_find(dev_t dev, int *part, void *data) 334 { 335 *part = 0; 336 return get_disk(z2ram_gendisk); 337 } 338 339 static struct request_queue *z2_queue; 340 341 static int __init 342 z2_init(void) 343 { 344 int ret; 345 346 if (!MACH_IS_AMIGA) 347 return -ENODEV; 348 349 ret = -EBUSY; 350 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 351 goto err; 352 353 ret = -ENOMEM; 354 z2ram_gendisk = alloc_disk(1); 355 if (!z2ram_gendisk) 356 goto out_disk; 357 358 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock); 359 if (!z2_queue) 360 goto out_queue; 361 362 z2ram_gendisk->major = Z2RAM_MAJOR; 363 z2ram_gendisk->first_minor = 0; 364 z2ram_gendisk->fops = &z2_fops; 365 sprintf(z2ram_gendisk->disk_name, "z2ram"); 366 367 z2ram_gendisk->queue = z2_queue; 368 add_disk(z2ram_gendisk); 369 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, 370 z2_find, NULL, NULL); 371 372 return 0; 373 374 out_queue: 375 put_disk(z2ram_gendisk); 376 out_disk: 377 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 378 err: 379 return ret; 380 } 381 382 static void __exit z2_exit(void) 383 { 384 int i, j; 385 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT); 386 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 387 del_gendisk(z2ram_gendisk); 388 put_disk(z2ram_gendisk); 389 blk_cleanup_queue(z2_queue); 390 391 if ( current_device != -1 ) 392 { 393 i = 0; 394 395 for ( j = 0 ; j < z2_count; j++ ) 396 { 397 set_bit( i++, zorro_unused_z2ram ); 398 } 399 400 for ( j = 0 ; j < chip_count; j++ ) 401 { 402 if ( z2ram_map[ i ] ) 403 { 404 amiga_chip_free( (void *) z2ram_map[ i++ ] ); 405 } 406 } 407 408 if ( z2ram_map != NULL ) 409 { 410 kfree( z2ram_map ); 411 } 412 } 413 414 return; 415 } 416 417 module_init(z2_init); 418 module_exit(z2_exit); 419 MODULE_LICENSE("GPL"); 420