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) 240 goto err_out; 241 242 get_z2ram(); 243 244 if (z2ram_size != 0) 245 printk(KERN_INFO DEVICE_NAME 246 ": using %iK of Zorro II RAM\n", 247 z2_count * Z2RAM_CHUNK1024); 248 249 break; 250 251 case Z2MINOR_CHIPONLY: 252 z2ram_map = kmalloc(max_chip_map, GFP_KERNEL); 253 if (!z2ram_map) 254 goto err_out; 255 256 get_chipram(); 257 258 if (z2ram_size != 0) 259 printk(KERN_INFO DEVICE_NAME 260 ": using %iK Chip RAM\n", 261 chip_count * Z2RAM_CHUNK1024); 262 263 break; 264 265 default: 266 rc = -ENODEV; 267 goto err_out; 268 269 break; 270 } 271 272 if (z2ram_size == 0) { 273 printk(KERN_NOTICE DEVICE_NAME 274 ": no unused ZII/Chip RAM found\n"); 275 goto err_out_kfree; 276 } 277 278 current_device = device; 279 z2ram_size <<= Z2RAM_CHUNKSHIFT; 280 set_capacity(z2ram_gendisk[device], z2ram_size >> 9); 281 } 282 283 mutex_unlock(&z2ram_mutex); 284 return 0; 285 286 err_out_kfree: 287 kfree(z2ram_map); 288 err_out: 289 mutex_unlock(&z2ram_mutex); 290 return rc; 291 } 292 293 static void z2_release(struct gendisk *disk, fmode_t mode) 294 { 295 mutex_lock(&z2ram_mutex); 296 if (current_device == -1) { 297 mutex_unlock(&z2ram_mutex); 298 return; 299 } 300 mutex_unlock(&z2ram_mutex); 301 /* 302 * FIXME: unmap memory 303 */ 304 } 305 306 static const struct block_device_operations z2_fops = { 307 .owner = THIS_MODULE, 308 .open = z2_open, 309 .release = z2_release, 310 }; 311 312 static struct blk_mq_tag_set tag_set; 313 314 static const struct blk_mq_ops z2_mq_ops = { 315 .queue_rq = z2_queue_rq, 316 }; 317 318 static int z2ram_register_disk(int minor) 319 { 320 struct gendisk *disk; 321 int err; 322 323 disk = blk_mq_alloc_disk(&tag_set, NULL); 324 if (IS_ERR(disk)) 325 return PTR_ERR(disk); 326 327 disk->major = Z2RAM_MAJOR; 328 disk->first_minor = minor; 329 disk->minors = 1; 330 disk->flags |= GENHD_FL_NO_PART; 331 disk->fops = &z2_fops; 332 if (minor) 333 sprintf(disk->disk_name, "z2ram%d", minor); 334 else 335 sprintf(disk->disk_name, "z2ram"); 336 337 z2ram_gendisk[minor] = disk; 338 err = add_disk(disk); 339 if (err) 340 put_disk(disk); 341 return err; 342 } 343 344 static int __init z2_init(void) 345 { 346 int ret, i; 347 348 if (!MACH_IS_AMIGA) 349 return -ENODEV; 350 351 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 352 return -EBUSY; 353 354 tag_set.ops = &z2_mq_ops; 355 tag_set.nr_hw_queues = 1; 356 tag_set.nr_maps = 1; 357 tag_set.queue_depth = 16; 358 tag_set.numa_node = NUMA_NO_NODE; 359 tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 360 ret = blk_mq_alloc_tag_set(&tag_set); 361 if (ret) 362 goto out_unregister_blkdev; 363 364 for (i = 0; i < Z2MINOR_COUNT; i++) { 365 ret = z2ram_register_disk(i); 366 if (ret && i == 0) 367 goto out_free_tagset; 368 } 369 370 return 0; 371 372 out_free_tagset: 373 blk_mq_free_tag_set(&tag_set); 374 out_unregister_blkdev: 375 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 376 return ret; 377 } 378 379 static void __exit z2_exit(void) 380 { 381 int i, j; 382 383 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 384 385 for (i = 0; i < Z2MINOR_COUNT; i++) { 386 del_gendisk(z2ram_gendisk[i]); 387 put_disk(z2ram_gendisk[i]); 388 } 389 blk_mq_free_tag_set(&tag_set); 390 391 if (current_device != -1) { 392 i = 0; 393 394 for (j = 0; j < z2_count; j++) { 395 set_bit(i++, zorro_unused_z2ram); 396 } 397 398 for (j = 0; j < chip_count; j++) { 399 if (z2ram_map[i]) { 400 amiga_chip_free((void *)z2ram_map[i++]); 401 } 402 } 403 404 if (z2ram_map != NULL) { 405 kfree(z2ram_map); 406 } 407 } 408 409 return; 410 } 411 412 module_init(z2_init); 413 module_exit(z2_exit); 414 MODULE_LICENSE("GPL"); 415