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 #define Z2MINOR_COMBINED (0) 46 #define Z2MINOR_Z2ONLY (1) 47 #define Z2MINOR_CHIPONLY (2) 48 #define Z2MINOR_MEMLIST1 (4) 49 #define Z2MINOR_MEMLIST2 (5) 50 #define Z2MINOR_MEMLIST3 (6) 51 #define Z2MINOR_MEMLIST4 (7) 52 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */ 53 54 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) 55 56 static DEFINE_MUTEX(z2ram_mutex); 57 static u_long *z2ram_map = NULL; 58 static u_long z2ram_size = 0; 59 static int z2_count = 0; 60 static int chip_count = 0; 61 static int list_count = 0; 62 static int current_device = -1; 63 64 static DEFINE_SPINLOCK(z2ram_lock); 65 66 static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT]; 67 68 static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx, 69 const struct blk_mq_queue_data *bd) 70 { 71 struct request *req = bd->rq; 72 unsigned long start = blk_rq_pos(req) << 9; 73 unsigned long len = blk_rq_cur_bytes(req); 74 75 blk_mq_start_request(req); 76 77 if (start + len > z2ram_size) { 78 pr_err(DEVICE_NAME ": bad access: block=%llu, " 79 "count=%u\n", 80 (unsigned long long)blk_rq_pos(req), 81 blk_rq_cur_sectors(req)); 82 return BLK_STS_IOERR; 83 } 84 85 spin_lock_irq(&z2ram_lock); 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 } 102 103 spin_unlock_irq(&z2ram_lock); 104 blk_mq_end_request(req, BLK_STS_OK); 105 return BLK_STS_OK; 106 } 107 108 static void get_z2ram(void) 109 { 110 int i; 111 112 for (i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++) { 113 if (test_bit(i, zorro_unused_z2ram)) { 114 z2_count++; 115 z2ram_map[z2ram_size++] = 116 (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 get_chipram(void) 126 { 127 128 while (amiga_chip_avail() > (Z2RAM_CHUNKSIZE * 4)) { 129 chip_count++; 130 z2ram_map[z2ram_size] = 131 (u_long) amiga_chip_alloc(Z2RAM_CHUNKSIZE, "z2ram"); 132 133 if (z2ram_map[z2ram_size] == 0) { 134 break; 135 } 136 137 z2ram_size++; 138 } 139 140 return; 141 } 142 143 static int z2_open(struct block_device *bdev, fmode_t mode) 144 { 145 int device; 146 int max_z2_map = (Z2RAM_SIZE / Z2RAM_CHUNKSIZE) * sizeof(z2ram_map[0]); 147 int max_chip_map = (amiga_chip_size / Z2RAM_CHUNKSIZE) * 148 sizeof(z2ram_map[0]); 149 int rc = -ENOMEM; 150 151 device = MINOR(bdev->bd_dev); 152 153 mutex_lock(&z2ram_mutex); 154 if (current_device != -1 && current_device != device) { 155 rc = -EBUSY; 156 goto err_out; 157 } 158 159 if (current_device == -1) { 160 z2_count = 0; 161 chip_count = 0; 162 list_count = 0; 163 z2ram_size = 0; 164 165 /* Use a specific list entry. */ 166 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 167 int index = device - Z2MINOR_MEMLIST1 + 1; 168 unsigned long size, paddr, vaddr; 169 170 if (index >= m68k_realnum_memory) { 171 printk(KERN_ERR DEVICE_NAME 172 ": no such entry in z2ram_map\n"); 173 goto err_out; 174 } 175 176 paddr = m68k_memory[index].addr; 177 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1); 178 179 #ifdef __powerpc__ 180 /* FIXME: ioremap doesn't build correct memory tables. */ 181 { 182 vfree(vmalloc(size)); 183 } 184 185 vaddr = (unsigned long)ioremap_wt(paddr, size); 186 187 #else 188 vaddr = 189 (unsigned long)z_remap_nocache_nonser(paddr, size); 190 #endif 191 z2ram_map = 192 kmalloc_array(size / Z2RAM_CHUNKSIZE, 193 sizeof(z2ram_map[0]), GFP_KERNEL); 194 if (z2ram_map == NULL) { 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 switch (device) { 213 case Z2MINOR_COMBINED: 214 215 z2ram_map = 216 kmalloc(max_z2_map + max_chip_map, 217 GFP_KERNEL); 218 if (z2ram_map == NULL) { 219 printk(KERN_ERR DEVICE_NAME 220 ": cannot get mem for z2ram_map\n"); 221 goto err_out; 222 } 223 224 get_z2ram(); 225 get_chipram(); 226 227 if (z2ram_size != 0) 228 printk(KERN_INFO DEVICE_NAME 229 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 230 z2_count * Z2RAM_CHUNK1024, 231 chip_count * Z2RAM_CHUNK1024, 232 (z2_count + 233 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 printk(KERN_ERR DEVICE_NAME 241 ": cannot get mem for z2ram_map\n"); 242 goto err_out; 243 } 244 245 get_z2ram(); 246 247 if (z2ram_size != 0) 248 printk(KERN_INFO DEVICE_NAME 249 ": using %iK of Zorro II RAM\n", 250 z2_count * Z2RAM_CHUNK1024); 251 252 break; 253 254 case Z2MINOR_CHIPONLY: 255 z2ram_map = kmalloc(max_chip_map, GFP_KERNEL); 256 if (z2ram_map == NULL) { 257 printk(KERN_ERR DEVICE_NAME 258 ": cannot get mem for z2ram_map\n"); 259 goto err_out; 260 } 261 262 get_chipram(); 263 264 if (z2ram_size != 0) 265 printk(KERN_INFO DEVICE_NAME 266 ": using %iK Chip RAM\n", 267 chip_count * Z2RAM_CHUNK1024); 268 269 break; 270 271 default: 272 rc = -ENODEV; 273 goto err_out; 274 275 break; 276 } 277 278 if (z2ram_size == 0) { 279 printk(KERN_NOTICE DEVICE_NAME 280 ": no unused ZII/Chip RAM found\n"); 281 goto err_out_kfree; 282 } 283 284 current_device = device; 285 z2ram_size <<= Z2RAM_CHUNKSHIFT; 286 set_capacity(z2ram_gendisk[device], z2ram_size >> 9); 287 } 288 289 mutex_unlock(&z2ram_mutex); 290 return 0; 291 292 err_out_kfree: 293 kfree(z2ram_map); 294 err_out: 295 mutex_unlock(&z2ram_mutex); 296 return rc; 297 } 298 299 static void z2_release(struct gendisk *disk, fmode_t mode) 300 { 301 mutex_lock(&z2ram_mutex); 302 if (current_device == -1) { 303 mutex_unlock(&z2ram_mutex); 304 return; 305 } 306 mutex_unlock(&z2ram_mutex); 307 /* 308 * FIXME: unmap memory 309 */ 310 } 311 312 static const struct block_device_operations z2_fops = { 313 .owner = THIS_MODULE, 314 .open = z2_open, 315 .release = z2_release, 316 }; 317 318 static struct blk_mq_tag_set tag_set; 319 320 static const struct blk_mq_ops z2_mq_ops = { 321 .queue_rq = z2_queue_rq, 322 }; 323 324 static int z2ram_register_disk(int minor) 325 { 326 struct request_queue *q; 327 struct gendisk *disk; 328 329 disk = alloc_disk(1); 330 if (!disk) 331 return -ENOMEM; 332 333 q = blk_mq_init_queue(&tag_set); 334 if (IS_ERR(q)) { 335 put_disk(disk); 336 return PTR_ERR(q); 337 } 338 339 disk->major = Z2RAM_MAJOR; 340 disk->first_minor = minor; 341 disk->fops = &z2_fops; 342 if (minor) 343 sprintf(disk->disk_name, "z2ram%d", minor); 344 else 345 sprintf(disk->disk_name, "z2ram"); 346 disk->queue = q; 347 348 z2ram_gendisk[minor] = disk; 349 add_disk(disk); 350 return 0; 351 } 352 353 static int __init z2_init(void) 354 { 355 int ret, i; 356 357 if (!MACH_IS_AMIGA) 358 return -ENODEV; 359 360 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 361 return -EBUSY; 362 363 tag_set.ops = &z2_mq_ops; 364 tag_set.nr_hw_queues = 1; 365 tag_set.nr_maps = 1; 366 tag_set.queue_depth = 16; 367 tag_set.numa_node = NUMA_NO_NODE; 368 tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 369 ret = blk_mq_alloc_tag_set(&tag_set); 370 if (ret) 371 goto out_unregister_blkdev; 372 373 for (i = 0; i < Z2MINOR_COUNT; i++) { 374 ret = z2ram_register_disk(i); 375 if (ret && i == 0) 376 goto out_free_tagset; 377 } 378 379 return 0; 380 381 out_free_tagset: 382 blk_mq_free_tag_set(&tag_set); 383 out_unregister_blkdev: 384 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 385 return ret; 386 } 387 388 static void __exit z2_exit(void) 389 { 390 int i, j; 391 392 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 393 394 for (i = 0; i < Z2MINOR_COUNT; i++) { 395 del_gendisk(z2ram_gendisk[i]); 396 blk_cleanup_queue(z2ram_gendisk[i]->queue); 397 put_disk(z2ram_gendisk[i]); 398 } 399 blk_mq_free_tag_set(&tag_set); 400 401 if (current_device != -1) { 402 i = 0; 403 404 for (j = 0; j < z2_count; j++) { 405 set_bit(i++, zorro_unused_z2ram); 406 } 407 408 for (j = 0; j < chip_count; j++) { 409 if (z2ram_map[i]) { 410 amiga_chip_free((void *)z2ram_map[i++]); 411 } 412 } 413 414 if (z2ram_map != NULL) { 415 kfree(z2ram_map); 416 } 417 } 418 419 return; 420 } 421 422 module_init(z2_init); 423 module_exit(z2_exit); 424 MODULE_LICENSE("GPL"); 425