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