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