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