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/blkdev.h> 35#include <linux/bitops.h> 36#include <linux/smp_lock.h> 37#include <linux/slab.h> 38 39#include <asm/setup.h> 40#include <asm/amigahw.h> 41#include <asm/pgtable.h> 42 43#include <linux/zorro.h> 44 45 46extern int m68k_realnum_memory; 47extern struct mem_info m68k_memory[NUM_MEMINFO]; 48 49#define Z2MINOR_COMBINED (0) 50#define Z2MINOR_Z2ONLY (1) 51#define Z2MINOR_CHIPONLY (2) 52#define Z2MINOR_MEMLIST1 (4) 53#define Z2MINOR_MEMLIST2 (5) 54#define Z2MINOR_MEMLIST3 (6) 55#define Z2MINOR_MEMLIST4 (7) 56#define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */ 57 58#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 ) 59 60static u_long *z2ram_map = NULL; 61static u_long z2ram_size = 0; 62static int z2_count = 0; 63static int chip_count = 0; 64static int list_count = 0; 65static int current_device = -1; 66 67static DEFINE_SPINLOCK(z2ram_lock); 68 69static struct gendisk *z2ram_gendisk; 70 71static void do_z2_request(struct request_queue *q) 72{ 73 struct request *req; 74 75 req = blk_fetch_request(q); 76 while (req) { 77 unsigned long start = blk_rq_pos(req) << 9; 78 unsigned long len = blk_rq_cur_bytes(req); 79 int err = 0; 80 81 if (start + len > z2ram_size) { 82 printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n", 83 blk_rq_pos(req), blk_rq_cur_sectors(req)); 84 err = -EIO; 85 goto done; 86 } 87 while (len) { 88 unsigned long addr = start & Z2RAM_CHUNKMASK; 89 unsigned long size = Z2RAM_CHUNKSIZE - addr; 90 if (len < size) 91 size = len; 92 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ]; 93 if (rq_data_dir(req) == READ) 94 memcpy(req->buffer, (char *)addr, size); 95 else 96 memcpy((char *)addr, req->buffer, size); 97 start += size; 98 len -= size; 99 } 100 done: 101 if (!__blk_end_request_cur(req, err)) 102 req = blk_fetch_request(q); 103 } 104} 105 106static void 107get_z2ram( void ) 108{ 109 int i; 110 111 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ ) 112 { 113 if ( test_bit( i, zorro_unused_z2ram ) ) 114 { 115 z2_count++; 116 z2ram_map[ z2ram_size++ ] = 117 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT ); 118 clear_bit( i, zorro_unused_z2ram ); 119 } 120 } 121 122 return; 123} 124 125static void 126get_chipram( void ) 127{ 128 129 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) ) 130 { 131 chip_count++; 132 z2ram_map[ z2ram_size ] = 133 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" ); 134 135 if ( z2ram_map[ z2ram_size ] == 0 ) 136 { 137 break; 138 } 139 140 z2ram_size++; 141 } 142 143 return; 144} 145 146static int z2_open(struct block_device *bdev, fmode_t mode) 147{ 148 int device; 149 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) * 150 sizeof( z2ram_map[0] ); 151 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) * 152 sizeof( z2ram_map[0] ); 153 int rc = -ENOMEM; 154 155 device = MINOR(bdev->bd_dev); 156 157 lock_kernel(); 158 if ( current_device != -1 && current_device != device ) 159 { 160 rc = -EBUSY; 161 goto err_out; 162 } 163 164 if ( current_device == -1 ) 165 { 166 z2_count = 0; 167 chip_count = 0; 168 list_count = 0; 169 z2ram_size = 0; 170 171 /* Use a specific list entry. */ 172 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) { 173 int index = device - Z2MINOR_MEMLIST1 + 1; 174 unsigned long size, paddr, vaddr; 175 176 if (index >= m68k_realnum_memory) { 177 printk( KERN_ERR DEVICE_NAME 178 ": no such entry in z2ram_map\n" ); 179 goto err_out; 180 } 181 182 paddr = m68k_memory[index].addr; 183 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1); 184 185#ifdef __powerpc__ 186 { 187 vfree(vmalloc (size)); 188 } 189 190 vaddr = (unsigned long) __ioremap (paddr, size, 191 _PAGE_WRITETHRU); 192 193#else 194 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size); 195#endif 196 z2ram_map = 197 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]), 198 GFP_KERNEL); 199 if ( z2ram_map == NULL ) 200 { 201 printk( KERN_ERR DEVICE_NAME 202 ": cannot get mem for z2ram_map\n" ); 203 goto err_out; 204 } 205 206 while (size) { 207 z2ram_map[ z2ram_size++ ] = vaddr; 208 size -= Z2RAM_CHUNKSIZE; 209 vaddr += Z2RAM_CHUNKSIZE; 210 list_count++; 211 } 212 213 if ( z2ram_size != 0 ) 214 printk( KERN_INFO DEVICE_NAME 215 ": using %iK List Entry %d Memory\n", 216 list_count * Z2RAM_CHUNK1024, index ); 217 } else 218 219 switch ( device ) 220 { 221 case Z2MINOR_COMBINED: 222 223 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL ); 224 if ( z2ram_map == NULL ) 225 { 226 printk( KERN_ERR DEVICE_NAME 227 ": cannot get mem for z2ram_map\n" ); 228 goto err_out; 229 } 230 231 get_z2ram(); 232 get_chipram(); 233 234 if ( z2ram_size != 0 ) 235 printk( KERN_INFO DEVICE_NAME 236 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n", 237 z2_count * Z2RAM_CHUNK1024, 238 chip_count * Z2RAM_CHUNK1024, 239 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 ); 240 241 break; 242 243 case Z2MINOR_Z2ONLY: 244 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL ); 245 if ( z2ram_map == NULL ) 246 { 247 printk( KERN_ERR DEVICE_NAME 248 ": cannot get mem for z2ram_map\n" ); 249 goto err_out; 250 } 251 252 get_z2ram(); 253 254 if ( z2ram_size != 0 ) 255 printk( KERN_INFO DEVICE_NAME 256 ": using %iK of Zorro II RAM\n", 257 z2_count * Z2RAM_CHUNK1024 ); 258 259 break; 260 261 case Z2MINOR_CHIPONLY: 262 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL ); 263 if ( z2ram_map == NULL ) 264 { 265 printk( KERN_ERR DEVICE_NAME 266 ": cannot get mem for z2ram_map\n" ); 267 goto err_out; 268 } 269 270 get_chipram(); 271 272 if ( z2ram_size != 0 ) 273 printk( KERN_INFO DEVICE_NAME 274 ": using %iK Chip RAM\n", 275 chip_count * Z2RAM_CHUNK1024 ); 276 277 break; 278 279 default: 280 rc = -ENODEV; 281 goto err_out; 282 283 break; 284 } 285 286 if ( z2ram_size == 0 ) 287 { 288 printk( KERN_NOTICE DEVICE_NAME 289 ": no unused ZII/Chip RAM found\n" ); 290 goto err_out_kfree; 291 } 292 293 current_device = device; 294 z2ram_size <<= Z2RAM_CHUNKSHIFT; 295 set_capacity(z2ram_gendisk, z2ram_size >> 9); 296 } 297 298 unlock_kernel(); 299 return 0; 300 301err_out_kfree: 302 kfree(z2ram_map); 303err_out: 304 unlock_kernel(); 305 return rc; 306} 307 308static int 309z2_release(struct gendisk *disk, fmode_t mode) 310{ 311 lock_kernel(); 312 if ( current_device == -1 ) { 313 unlock_kernel(); 314 return 0; 315 } 316 unlock_kernel(); 317 318 return 0; 319} 320 321static const struct block_device_operations z2_fops = 322{ 323 .owner = THIS_MODULE, 324 .open = z2_open, 325 .release = z2_release, 326}; 327 328static struct kobject *z2_find(dev_t dev, int *part, void *data) 329{ 330 *part = 0; 331 return get_disk(z2ram_gendisk); 332} 333 334static struct request_queue *z2_queue; 335 336static int __init 337z2_init(void) 338{ 339 int ret; 340 341 if (!MACH_IS_AMIGA) 342 return -ENODEV; 343 344 ret = -EBUSY; 345 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME)) 346 goto err; 347 348 ret = -ENOMEM; 349 z2ram_gendisk = alloc_disk(1); 350 if (!z2ram_gendisk) 351 goto out_disk; 352 353 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock); 354 if (!z2_queue) 355 goto out_queue; 356 357 z2ram_gendisk->major = Z2RAM_MAJOR; 358 z2ram_gendisk->first_minor = 0; 359 z2ram_gendisk->fops = &z2_fops; 360 sprintf(z2ram_gendisk->disk_name, "z2ram"); 361 362 z2ram_gendisk->queue = z2_queue; 363 add_disk(z2ram_gendisk); 364 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE, 365 z2_find, NULL, NULL); 366 367 return 0; 368 369out_queue: 370 put_disk(z2ram_gendisk); 371out_disk: 372 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 373err: 374 return ret; 375} 376 377static void __exit z2_exit(void) 378{ 379 int i, j; 380 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT); 381 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME); 382 del_gendisk(z2ram_gendisk); 383 put_disk(z2ram_gendisk); 384 blk_cleanup_queue(z2_queue); 385 386 if ( current_device != -1 ) 387 { 388 i = 0; 389 390 for ( j = 0 ; j < z2_count; j++ ) 391 { 392 set_bit( i++, zorro_unused_z2ram ); 393 } 394 395 for ( j = 0 ; j < chip_count; j++ ) 396 { 397 if ( z2ram_map[ i ] ) 398 { 399 amiga_chip_free( (void *) z2ram_map[ i++ ] ); 400 } 401 } 402 403 if ( z2ram_map != NULL ) 404 { 405 kfree( z2ram_map ); 406 } 407 } 408 409 return; 410} 411 412module_init(z2_init); 413module_exit(z2_exit); 414MODULE_LICENSE("GPL"); 415