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/blk-mq.h> 35 #include <linux/bitops.h> 36 #include <linux/mutex.h> 37 #include <linux/slab.h> 38 #include <linux/pgtable.h> 39 40 #include <asm/setup.h> 41 #include <asm/amigahw.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 blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx, 70 const struct blk_mq_queue_data *bd) 71 { 72 struct request *req = bd->rq; 73 unsigned long start = blk_rq_pos(req) << 9; 74 unsigned long len = blk_rq_cur_bytes(req); 75 76 blk_mq_start_request(req); 77 78 if (start + len > z2ram_size) { 79 pr_err(DEVICE_NAME ": bad access: block=%llu, " 80 "count=%u\n", 81 (unsigned long long)blk_rq_pos(req), 82 blk_rq_cur_sectors(req)); 83 return BLK_STS_IOERR; 84 } 85 86 spin_lock_irq(&z2ram_lock); 87 88 while (len) { 89 unsigned long addr = start & Z2RAM_CHUNKMASK; 90 unsigned long size = Z2RAM_CHUNKSIZE - addr; 91 void *buffer = bio_data(req->bio); 92 93 if (len < size) 94 size = len; 95 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; 96 if (rq_data_dir(req) == READ) 97 memcpy(buffer, (char *)addr, size); 98 else 99 memcpy((char *)addr, buffer, size); 100 start += size; 101 len -= size; 102 } 103 104 spin_unlock_irq(&z2ram_lock); 105 blk_mq_end_request(req, BLK_STS_OK); 106 return BLK_STS_OK; 107 } 108 109 static void 110 get_z2ram( void ) 111 { 112 int i; 113 114 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) 115 { 116 if ( test_bit( i, zorro_unused_z2ram ) ) 117 { 118 z2_count++; 119 z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) + 120 (i << Z2RAM_CHUNKSHIFT); 121 clear_bit( i, zorro_unused_z2ram ); 122 } 123 } 124 125 return; 126 } 127 128 static void 129 get_chipram( void ) 130 { 131 132 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) 133 { 134 chip_count++; 135 z2ram_map[ z2ram_size ] = 136 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); 137 138 if ( z2ram_map[ z2ram_size ] == 0 ) 139 { 140 break; 141 } 142 143 z2ram_size++; 144 } 145 146 return; 147 } 148 149 static int z2_open(struct block_device *bdev, fmode_t mode) 150 { 151 int device; 152 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * 153 sizeof( z2ram_map[0] ); 154 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * 155 sizeof( z2ram_map[0] ); 156 int rc = -ENOMEM; 157 158 device = MINOR(bdev->bd_dev); 159 160 mutex_lock(&z2ram_mutex); 161 if ( current_device != -1 && current_device != device ) 162 { 163 rc = -EBUSY; 164 goto err_out; 165 } 166 167 if ( current_device == -1 ) 168 { 169 z2_count = 0; 170 chip_count = 0; 171 list_count = 0; 172 z2ram_size = 0; 173 174 /* Use a specific list entry. */ 175 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 176 int index = device - Z2MINOR_MEMLIST1 + 1; 177 unsigned long size, paddr, vaddr; 178 179 if (index >= m68k_realnum_memory) { 180 printk( KERN_ERR DEVICE_NAME 181 ": no such entry in z2ram_map\n" ); 182 goto err_out; 183 } 184 185 paddr = m68k_memory[index].addr; 186 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); 187 188 #ifdef __powerpc__ 189 /* FIXME: ioremap doesn't build correct memory tables. */ 190 { 191 vfree(vmalloc (size)); 192 } 193 194 vaddr = (unsigned long)ioremap_wt(paddr, size); 195 196 #else 197 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); 198 #endif 199 z2ram_map = 200 kmalloc_array(size / Z2RAM_CHUNKSIZE, 201 sizeof(z2ram_map[0]), 202 GFP_KERNEL); 203 if ( z2ram_map == NULL ) 204 { 205 printk( KERN_ERR DEVICE_NAME 206 ": cannot get mem for z2ram_map\n" ); 207 goto err_out; 208 } 209 210 while (size) { 211 z2ram_map[ z2ram_size++ ] = vaddr; 212 size -= Z2RAM_CHUNKSIZE; 213 vaddr += Z2RAM_CHUNKSIZE; 214 list_count++; 215 } 216 217 if ( z2ram_size != 0 ) 218 printk( KERN_INFO DEVICE_NAME 219 ": using %iK List Entry %d Memory\n", 220 list_count * Z2RAM_CHUNK1024, index ); 221 } else 222 223 switch ( device ) 224 { 225 case Z2MINOR_COMBINED: 226 227 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); 228 if ( z2ram_map == NULL ) 229 { 230 printk( KERN_ERR DEVICE_NAME 231 ": cannot get mem for z2ram_map\n" ); 232 goto err_out; 233 } 234 235 get_z2ram(); 236 get_chipram(); 237 238 if ( z2ram_size != 0 ) 239 printk( KERN_INFO DEVICE_NAME 240 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 241 z2_count * Z2RAM_CHUNK1024, 242 chip_count * Z2RAM_CHUNK1024, 243 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); 244 245 break; 246 247 case Z2MINOR_Z2ONLY: 248 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); 249 if ( z2ram_map == NULL ) 250 { 251 printk( KERN_ERR DEVICE_NAME 252 ": cannot get mem for z2ram_map\n" ); 253 goto err_out; 254 } 255 256 get_z2ram(); 257 258 if ( z2ram_size != 0 ) 259 printk( KERN_INFO DEVICE_NAME 260 ": using %iK of Zorro II RAM\n", 261 z2_count * Z2RAM_CHUNK1024 ); 262 263 break; 264 265 case Z2MINOR_CHIPONLY: 266 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); 267 if ( z2ram_map == NULL ) 268 { 269 printk( KERN_ERR DEVICE_NAME 270 ": cannot get mem for z2ram_map\n" ); 271 goto err_out; 272 } 273 274 get_chipram(); 275 276 if ( z2ram_size != 0 ) 277 printk( KERN_INFO DEVICE_NAME 278 ": using %iK Chip RAM\n", 279 chip_count * Z2RAM_CHUNK1024 ); 280 281 break; 282 283 default: 284 rc = -ENODEV; 285 goto err_out; 286 287 break; 288 } 289 290 if ( z2ram_size == 0 ) 291 { 292 printk( KERN_NOTICE DEVICE_NAME 293 ": no unused ZII/Chip RAM found\n" ); 294 goto err_out_kfree; 295 } 296 297 current_device = device; 298 z2ram_size <<= Z2RAM_CHUNKSHIFT; 299 set_capacity(z2ram_gendisk, z2ram_size >> 9); 300 } 301 302 mutex_unlock(&z2ram_mutex); 303 return 0; 304 305 err_out_kfree: 306 kfree(z2ram_map); 307 err_out: 308 mutex_unlock(&z2ram_mutex); 309 return rc; 310 } 311 312 static void 313 z2_release(struct gendisk *disk, fmode_t mode) 314 { 315 mutex_lock(&z2ram_mutex); 316 if ( current_device == -1 ) { 317 mutex_unlock(&z2ram_mutex); 318 return; 319 } 320 mutex_unlock(&z2ram_mutex); 321 /* 322 * FIXME: unmap memory 323 */ 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_and_module(z2ram_gendisk); 337 } 338 339 static struct request_queue *z2_queue; 340 static struct blk_mq_tag_set tag_set; 341 342 static const struct blk_mq_ops z2_mq_ops = { 343 .queue_rq = z2_queue_rq, 344 }; 345 346 static int __init 347 z2_init(void) 348 { 349 int ret; 350 351 if (!MACH_IS_AMIGA) 352 return -ENODEV; 353 354 ret = -EBUSY; 355 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 356 goto err; 357 358 ret = -ENOMEM; 359 z2ram_gendisk = alloc_disk(1); 360 if (!z2ram_gendisk) 361 goto out_disk; 362 363 z2_queue = blk_mq_init_sq_queue(&tag_set, &z2_mq_ops, 16, 364 BLK_MQ_F_SHOULD_MERGE); 365 if (IS_ERR(z2_queue)) { 366 ret = PTR_ERR(z2_queue); 367 z2_queue = NULL; 368 goto out_queue; 369 } 370 371 z2ram_gendisk->major = Z2RAM_MAJOR; 372 z2ram_gendisk->first_minor = 0; 373 z2ram_gendisk->fops = &z2_fops; 374 sprintf(z2ram_gendisk->disk_name, "z2ram"); 375 376 z2ram_gendisk->queue = z2_queue; 377 add_disk(z2ram_gendisk); 378 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, 379 z2_find, NULL, NULL); 380 381 return 0; 382 383 out_queue: 384 put_disk(z2ram_gendisk); 385 out_disk: 386 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 387 err: 388 return ret; 389 } 390 391 static void __exit z2_exit(void) 392 { 393 int i, j; 394 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT); 395 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 396 del_gendisk(z2ram_gendisk); 397 put_disk(z2ram_gendisk); 398 blk_cleanup_queue(z2_queue); 399 blk_mq_free_tag_set(&tag_set); 400 401 if ( current_device != -1 ) 402 { 403 i = 0; 404 405 for ( j = 0 ; j < z2_count; j++ ) 406 { 407 set_bit( i++, zorro_unused_z2ram ); 408 } 409 410 for ( j = 0 ; j < chip_count; j++ ) 411 { 412 if ( z2ram_map[ i ] ) 413 { 414 amiga_chip_free( (void *) z2ram_map[ i++ ] ); 415 } 416 } 417 418 if ( z2ram_map != NULL ) 419 { 420 kfree( z2ram_map ); 421 } 422 } 423 424 return; 425 } 426 427 module_init(z2_init); 428 module_exit(z2_exit); 429 MODULE_LICENSE("GPL"); 430