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 gendisk *disk, blk_mode_t mode) 144 { 145 int device = disk->first_minor; 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 mutex_lock(&z2ram_mutex); 152 if (current_device != -1 && current_device != device) { 153 rc = -EBUSY; 154 goto err_out; 155 } 156 157 if (current_device == -1) { 158 z2_count = 0; 159 chip_count = 0; 160 list_count = 0; 161 z2ram_size = 0; 162 163 /* Use a specific list entry. */ 164 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 165 int index = device - Z2MINOR_MEMLIST1 + 1; 166 unsigned long size, paddr, vaddr; 167 168 if (index >= m68k_realnum_memory) { 169 printk(KERN_ERR DEVICE_NAME 170 ": no such entry in z2ram_map\n"); 171 goto err_out; 172 } 173 174 paddr = m68k_memory[index].addr; 175 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1); 176 177 #ifdef __powerpc__ 178 /* FIXME: ioremap doesn't build correct memory tables. */ 179 { 180 vfree(vmalloc(size)); 181 } 182 183 vaddr = (unsigned long)ioremap_wt(paddr, size); 184 185 #else 186 vaddr = 187 (unsigned long)z_remap_nocache_nonser(paddr, size); 188 #endif 189 z2ram_map = 190 kmalloc_array(size / Z2RAM_CHUNKSIZE, 191 sizeof(z2ram_map[0]), GFP_KERNEL); 192 if (z2ram_map == NULL) { 193 printk(KERN_ERR DEVICE_NAME 194 ": cannot get mem for z2ram_map\n"); 195 goto err_out; 196 } 197 198 while (size) { 199 z2ram_map[z2ram_size++] = vaddr; 200 size -= Z2RAM_CHUNKSIZE; 201 vaddr += Z2RAM_CHUNKSIZE; 202 list_count++; 203 } 204 205 if (z2ram_size != 0) 206 printk(KERN_INFO DEVICE_NAME 207 ": using %iK List Entry %d Memory\n", 208 list_count * Z2RAM_CHUNK1024, index); 209 } else 210 switch (device) { 211 case Z2MINOR_COMBINED: 212 213 z2ram_map = 214 kmalloc(max_z2_map + max_chip_map, 215 GFP_KERNEL); 216 if (z2ram_map == NULL) { 217 printk(KERN_ERR DEVICE_NAME 218 ": cannot get mem for z2ram_map\n"); 219 goto err_out; 220 } 221 222 get_z2ram(); 223 get_chipram(); 224 225 if (z2ram_size != 0) 226 printk(KERN_INFO DEVICE_NAME 227 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 228 z2_count * Z2RAM_CHUNK1024, 229 chip_count * Z2RAM_CHUNK1024, 230 (z2_count + 231 chip_count) * Z2RAM_CHUNK1024); 232 233 break; 234 235 case Z2MINOR_Z2ONLY: 236 z2ram_map = kmalloc(max_z2_map, GFP_KERNEL); 237 if (!z2ram_map) 238 goto err_out; 239 240 get_z2ram(); 241 242 if (z2ram_size != 0) 243 printk(KERN_INFO DEVICE_NAME 244 ": using %iK of Zorro II RAM\n", 245 z2_count * Z2RAM_CHUNK1024); 246 247 break; 248 249 case Z2MINOR_CHIPONLY: 250 z2ram_map = kmalloc(max_chip_map, GFP_KERNEL); 251 if (!z2ram_map) 252 goto err_out; 253 254 get_chipram(); 255 256 if (z2ram_size != 0) 257 printk(KERN_INFO DEVICE_NAME 258 ": using %iK Chip RAM\n", 259 chip_count * Z2RAM_CHUNK1024); 260 261 break; 262 263 default: 264 rc = -ENODEV; 265 goto err_out; 266 267 break; 268 } 269 270 if (z2ram_size == 0) { 271 printk(KERN_NOTICE DEVICE_NAME 272 ": no unused ZII/Chip RAM found\n"); 273 goto err_out_kfree; 274 } 275 276 current_device = device; 277 z2ram_size <<= Z2RAM_CHUNKSHIFT; 278 set_capacity(z2ram_gendisk[device], z2ram_size >> 9); 279 } 280 281 mutex_unlock(&z2ram_mutex); 282 return 0; 283 284 err_out_kfree: 285 kfree(z2ram_map); 286 err_out: 287 mutex_unlock(&z2ram_mutex); 288 return rc; 289 } 290 291 static void z2_release(struct gendisk *disk) 292 { 293 mutex_lock(&z2ram_mutex); 294 if (current_device == -1) { 295 mutex_unlock(&z2ram_mutex); 296 return; 297 } 298 mutex_unlock(&z2ram_mutex); 299 /* 300 * FIXME: unmap memory 301 */ 302 } 303 304 static const struct block_device_operations z2_fops = { 305 .owner = THIS_MODULE, 306 .open = z2_open, 307 .release = z2_release, 308 }; 309 310 static struct blk_mq_tag_set tag_set; 311 312 static const struct blk_mq_ops z2_mq_ops = { 313 .queue_rq = z2_queue_rq, 314 }; 315 316 static int z2ram_register_disk(int minor) 317 { 318 struct gendisk *disk; 319 int err; 320 321 disk = blk_mq_alloc_disk(&tag_set, NULL); 322 if (IS_ERR(disk)) 323 return PTR_ERR(disk); 324 325 disk->major = Z2RAM_MAJOR; 326 disk->first_minor = minor; 327 disk->minors = 1; 328 disk->flags |= GENHD_FL_NO_PART; 329 disk->fops = &z2_fops; 330 if (minor) 331 sprintf(disk->disk_name, "z2ram%d", minor); 332 else 333 sprintf(disk->disk_name, "z2ram"); 334 335 z2ram_gendisk[minor] = disk; 336 err = add_disk(disk); 337 if (err) 338 put_disk(disk); 339 return err; 340 } 341 342 static int __init z2_init(void) 343 { 344 int ret, i; 345 346 if (!MACH_IS_AMIGA) 347 return -ENODEV; 348 349 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 350 return -EBUSY; 351 352 tag_set.ops = &z2_mq_ops; 353 tag_set.nr_hw_queues = 1; 354 tag_set.nr_maps = 1; 355 tag_set.queue_depth = 16; 356 tag_set.numa_node = NUMA_NO_NODE; 357 tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 358 ret = blk_mq_alloc_tag_set(&tag_set); 359 if (ret) 360 goto out_unregister_blkdev; 361 362 for (i = 0; i < Z2MINOR_COUNT; i++) { 363 ret = z2ram_register_disk(i); 364 if (ret && i == 0) 365 goto out_free_tagset; 366 } 367 368 return 0; 369 370 out_free_tagset: 371 blk_mq_free_tag_set(&tag_set); 372 out_unregister_blkdev: 373 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 374 return ret; 375 } 376 377 static void __exit z2_exit(void) 378 { 379 int i, j; 380 381 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 382 383 for (i = 0; i < Z2MINOR_COUNT; i++) { 384 del_gendisk(z2ram_gendisk[i]); 385 put_disk(z2ram_gendisk[i]); 386 } 387 blk_mq_free_tag_set(&tag_set); 388 389 if (current_device != -1) { 390 i = 0; 391 392 for (j = 0; j < z2_count; j++) { 393 set_bit(i++, zorro_unused_z2ram); 394 } 395 396 for (j = 0; j < chip_count; j++) { 397 if (z2ram_map[i]) { 398 amiga_chip_free((void *)z2ram_map[i++]); 399 } 400 } 401 402 if (z2ram_map != NULL) { 403 kfree(z2ram_map); 404 } 405 } 406 407 return; 408 } 409 410 module_init(z2_init); 411 module_exit(z2_exit); 412 MODULE_LICENSE("GPL"); 413