| 1 | /* |
| 2 | ** PARISC 1.1 Dynamic DMA mapping support. |
| 3 | ** This implementation is for PA-RISC platforms that do not support |
| 4 | ** I/O TLBs (aka DMA address translation hardware). |
| 5 | ** See Documentation/DMA-API-HOWTO.txt for interface definitions. |
| 6 | ** |
| 7 | ** (c) Copyright 1999,2000 Hewlett-Packard Company |
| 8 | ** (c) Copyright 2000 Grant Grundler |
| 9 | ** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org> |
| 10 | ** (c) Copyright 2000 John Marvin |
| 11 | ** |
| 12 | ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c. |
| 13 | ** (I assume it's from David Mosberger-Tang but there was no Copyright) |
| 14 | ** |
| 15 | ** AFAIK, all PA7100LC and PA7300LC platforms can use this code. |
| 16 | ** |
| 17 | ** - ggg |
| 18 | */ |
| 19 | |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/gfp.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/pci.h> |
| 24 | #include <linux/proc_fs.h> |
| 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/scatterlist.h> |
| 29 | #include <linux/export.h> |
| 30 | |
| 31 | #include <asm/cacheflush.h> |
| 32 | #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ |
| 33 | #include <asm/io.h> |
| 34 | #include <asm/page.h> /* get_order */ |
| 35 | #include <asm/pgalloc.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | #include <asm/tlbflush.h> /* for purge_tlb_*() macros */ |
| 38 | |
| 39 | static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; |
| 40 | static unsigned long pcxl_used_bytes __read_mostly = 0; |
| 41 | static unsigned long pcxl_used_pages __read_mostly = 0; |
| 42 | |
| 43 | extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ |
| 44 | static spinlock_t pcxl_res_lock; |
| 45 | static char *pcxl_res_map; |
| 46 | static int pcxl_res_hint; |
| 47 | static int pcxl_res_size; |
| 48 | |
| 49 | #ifdef DEBUG_PCXL_RESOURCE |
| 50 | #define DBG_RES(x...) printk(x) |
| 51 | #else |
| 52 | #define DBG_RES(x...) |
| 53 | #endif |
| 54 | |
| 55 | |
| 56 | /* |
| 57 | ** Dump a hex representation of the resource map. |
| 58 | */ |
| 59 | |
| 60 | #ifdef DUMP_RESMAP |
| 61 | static |
| 62 | void dump_resmap(void) |
| 63 | { |
| 64 | u_long *res_ptr = (unsigned long *)pcxl_res_map; |
| 65 | u_long i = 0; |
| 66 | |
| 67 | printk("res_map: "); |
| 68 | for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr) |
| 69 | printk("%08lx ", *res_ptr); |
| 70 | |
| 71 | printk("\n"); |
| 72 | } |
| 73 | #else |
| 74 | static inline void dump_resmap(void) {;} |
| 75 | #endif |
| 76 | |
| 77 | static int pa11_dma_supported( struct device *dev, u64 mask) |
| 78 | { |
| 79 | return 1; |
| 80 | } |
| 81 | |
| 82 | static inline int map_pte_uncached(pte_t * pte, |
| 83 | unsigned long vaddr, |
| 84 | unsigned long size, unsigned long *paddr_ptr) |
| 85 | { |
| 86 | unsigned long end; |
| 87 | unsigned long orig_vaddr = vaddr; |
| 88 | |
| 89 | vaddr &= ~PMD_MASK; |
| 90 | end = vaddr + size; |
| 91 | if (end > PMD_SIZE) |
| 92 | end = PMD_SIZE; |
| 93 | do { |
| 94 | unsigned long flags; |
| 95 | |
| 96 | if (!pte_none(*pte)) |
| 97 | printk(KERN_ERR "map_pte_uncached: page already exists\n"); |
| 98 | set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); |
| 99 | purge_tlb_start(flags); |
| 100 | pdtlb_kernel(orig_vaddr); |
| 101 | purge_tlb_end(flags); |
| 102 | vaddr += PAGE_SIZE; |
| 103 | orig_vaddr += PAGE_SIZE; |
| 104 | (*paddr_ptr) += PAGE_SIZE; |
| 105 | pte++; |
| 106 | } while (vaddr < end); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr, |
| 111 | unsigned long size, unsigned long *paddr_ptr) |
| 112 | { |
| 113 | unsigned long end; |
| 114 | unsigned long orig_vaddr = vaddr; |
| 115 | |
| 116 | vaddr &= ~PGDIR_MASK; |
| 117 | end = vaddr + size; |
| 118 | if (end > PGDIR_SIZE) |
| 119 | end = PGDIR_SIZE; |
| 120 | do { |
| 121 | pte_t * pte = pte_alloc_kernel(pmd, vaddr); |
| 122 | if (!pte) |
| 123 | return -ENOMEM; |
| 124 | if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr)) |
| 125 | return -ENOMEM; |
| 126 | vaddr = (vaddr + PMD_SIZE) & PMD_MASK; |
| 127 | orig_vaddr += PMD_SIZE; |
| 128 | pmd++; |
| 129 | } while (vaddr < end); |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, |
| 134 | unsigned long paddr) |
| 135 | { |
| 136 | pgd_t * dir; |
| 137 | unsigned long end = vaddr + size; |
| 138 | |
| 139 | dir = pgd_offset_k(vaddr); |
| 140 | do { |
| 141 | pmd_t *pmd; |
| 142 | |
| 143 | pmd = pmd_alloc(NULL, dir, vaddr); |
| 144 | if (!pmd) |
| 145 | return -ENOMEM; |
| 146 | if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) |
| 147 | return -ENOMEM; |
| 148 | vaddr = vaddr + PGDIR_SIZE; |
| 149 | dir++; |
| 150 | } while (vaddr && (vaddr < end)); |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, |
| 155 | unsigned long size) |
| 156 | { |
| 157 | pte_t * pte; |
| 158 | unsigned long end; |
| 159 | unsigned long orig_vaddr = vaddr; |
| 160 | |
| 161 | if (pmd_none(*pmd)) |
| 162 | return; |
| 163 | if (pmd_bad(*pmd)) { |
| 164 | pmd_ERROR(*pmd); |
| 165 | pmd_clear(pmd); |
| 166 | return; |
| 167 | } |
| 168 | pte = pte_offset_map(pmd, vaddr); |
| 169 | vaddr &= ~PMD_MASK; |
| 170 | end = vaddr + size; |
| 171 | if (end > PMD_SIZE) |
| 172 | end = PMD_SIZE; |
| 173 | do { |
| 174 | unsigned long flags; |
| 175 | pte_t page = *pte; |
| 176 | |
| 177 | pte_clear(&init_mm, vaddr, pte); |
| 178 | purge_tlb_start(flags); |
| 179 | pdtlb_kernel(orig_vaddr); |
| 180 | purge_tlb_end(flags); |
| 181 | vaddr += PAGE_SIZE; |
| 182 | orig_vaddr += PAGE_SIZE; |
| 183 | pte++; |
| 184 | if (pte_none(page) || pte_present(page)) |
| 185 | continue; |
| 186 | printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); |
| 187 | } while (vaddr < end); |
| 188 | } |
| 189 | |
| 190 | static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, |
| 191 | unsigned long size) |
| 192 | { |
| 193 | pmd_t * pmd; |
| 194 | unsigned long end; |
| 195 | unsigned long orig_vaddr = vaddr; |
| 196 | |
| 197 | if (pgd_none(*dir)) |
| 198 | return; |
| 199 | if (pgd_bad(*dir)) { |
| 200 | pgd_ERROR(*dir); |
| 201 | pgd_clear(dir); |
| 202 | return; |
| 203 | } |
| 204 | pmd = pmd_offset(dir, vaddr); |
| 205 | vaddr &= ~PGDIR_MASK; |
| 206 | end = vaddr + size; |
| 207 | if (end > PGDIR_SIZE) |
| 208 | end = PGDIR_SIZE; |
| 209 | do { |
| 210 | unmap_uncached_pte(pmd, orig_vaddr, end - vaddr); |
| 211 | vaddr = (vaddr + PMD_SIZE) & PMD_MASK; |
| 212 | orig_vaddr += PMD_SIZE; |
| 213 | pmd++; |
| 214 | } while (vaddr < end); |
| 215 | } |
| 216 | |
| 217 | static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) |
| 218 | { |
| 219 | pgd_t * dir; |
| 220 | unsigned long end = vaddr + size; |
| 221 | |
| 222 | dir = pgd_offset_k(vaddr); |
| 223 | do { |
| 224 | unmap_uncached_pmd(dir, vaddr, end - vaddr); |
| 225 | vaddr = vaddr + PGDIR_SIZE; |
| 226 | dir++; |
| 227 | } while (vaddr && (vaddr < end)); |
| 228 | } |
| 229 | |
| 230 | #define PCXL_SEARCH_LOOP(idx, mask, size) \ |
| 231 | for(; res_ptr < res_end; ++res_ptr) \ |
| 232 | { \ |
| 233 | if(0 == ((*res_ptr) & mask)) { \ |
| 234 | *res_ptr |= mask; \ |
| 235 | idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \ |
| 236 | pcxl_res_hint = idx + (size >> 3); \ |
| 237 | goto resource_found; \ |
| 238 | } \ |
| 239 | } |
| 240 | |
| 241 | #define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \ |
| 242 | u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \ |
| 243 | u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \ |
| 244 | PCXL_SEARCH_LOOP(idx, mask, size); \ |
| 245 | res_ptr = (u##size *)&pcxl_res_map[0]; \ |
| 246 | PCXL_SEARCH_LOOP(idx, mask, size); \ |
| 247 | } |
| 248 | |
| 249 | unsigned long |
| 250 | pcxl_alloc_range(size_t size) |
| 251 | { |
| 252 | int res_idx; |
| 253 | u_long mask, flags; |
| 254 | unsigned int pages_needed = size >> PAGE_SHIFT; |
| 255 | |
| 256 | mask = (u_long) -1L; |
| 257 | mask >>= BITS_PER_LONG - pages_needed; |
| 258 | |
| 259 | DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", |
| 260 | size, pages_needed, mask); |
| 261 | |
| 262 | spin_lock_irqsave(&pcxl_res_lock, flags); |
| 263 | |
| 264 | if(pages_needed <= 8) { |
| 265 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 8); |
| 266 | } else if(pages_needed <= 16) { |
| 267 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 16); |
| 268 | } else if(pages_needed <= 32) { |
| 269 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 32); |
| 270 | } else { |
| 271 | panic("%s: pcxl_alloc_range() Too many pages to map.\n", |
| 272 | __FILE__); |
| 273 | } |
| 274 | |
| 275 | dump_resmap(); |
| 276 | panic("%s: pcxl_alloc_range() out of dma mapping resources\n", |
| 277 | __FILE__); |
| 278 | |
| 279 | resource_found: |
| 280 | |
| 281 | DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n", |
| 282 | res_idx, mask, pcxl_res_hint); |
| 283 | |
| 284 | pcxl_used_pages += pages_needed; |
| 285 | pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1); |
| 286 | |
| 287 | spin_unlock_irqrestore(&pcxl_res_lock, flags); |
| 288 | |
| 289 | dump_resmap(); |
| 290 | |
| 291 | /* |
| 292 | ** return the corresponding vaddr in the pcxl dma map |
| 293 | */ |
| 294 | return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3))); |
| 295 | } |
| 296 | |
| 297 | #define PCXL_FREE_MAPPINGS(idx, m, size) \ |
| 298 | u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \ |
| 299 | /* BUG_ON((*res_ptr & m) != m); */ \ |
| 300 | *res_ptr &= ~m; |
| 301 | |
| 302 | /* |
| 303 | ** clear bits in the pcxl resource map |
| 304 | */ |
| 305 | static void |
| 306 | pcxl_free_range(unsigned long vaddr, size_t size) |
| 307 | { |
| 308 | u_long mask, flags; |
| 309 | unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3); |
| 310 | unsigned int pages_mapped = size >> PAGE_SHIFT; |
| 311 | |
| 312 | mask = (u_long) -1L; |
| 313 | mask >>= BITS_PER_LONG - pages_mapped; |
| 314 | |
| 315 | DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", |
| 316 | res_idx, size, pages_mapped, mask); |
| 317 | |
| 318 | spin_lock_irqsave(&pcxl_res_lock, flags); |
| 319 | |
| 320 | if(pages_mapped <= 8) { |
| 321 | PCXL_FREE_MAPPINGS(res_idx, mask, 8); |
| 322 | } else if(pages_mapped <= 16) { |
| 323 | PCXL_FREE_MAPPINGS(res_idx, mask, 16); |
| 324 | } else if(pages_mapped <= 32) { |
| 325 | PCXL_FREE_MAPPINGS(res_idx, mask, 32); |
| 326 | } else { |
| 327 | panic("%s: pcxl_free_range() Too many pages to unmap.\n", |
| 328 | __FILE__); |
| 329 | } |
| 330 | |
| 331 | pcxl_used_pages -= (pages_mapped ? pages_mapped : 1); |
| 332 | pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1); |
| 333 | |
| 334 | spin_unlock_irqrestore(&pcxl_res_lock, flags); |
| 335 | |
| 336 | dump_resmap(); |
| 337 | } |
| 338 | |
| 339 | static int proc_pcxl_dma_show(struct seq_file *m, void *v) |
| 340 | { |
| 341 | #if 0 |
| 342 | u_long i = 0; |
| 343 | unsigned long *res_ptr = (u_long *)pcxl_res_map; |
| 344 | #endif |
| 345 | unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */ |
| 346 | |
| 347 | seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n", |
| 348 | PCXL_DMA_MAP_SIZE, total_pages); |
| 349 | |
| 350 | seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size); |
| 351 | |
| 352 | seq_puts(m, " total: free: used: % used:\n"); |
| 353 | seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size, |
| 354 | pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes, |
| 355 | (pcxl_used_bytes * 100) / pcxl_res_size); |
| 356 | |
| 357 | seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages, |
| 358 | total_pages - pcxl_used_pages, pcxl_used_pages, |
| 359 | (pcxl_used_pages * 100 / total_pages)); |
| 360 | |
| 361 | #if 0 |
| 362 | seq_puts(m, "\nResource bitmap:"); |
| 363 | |
| 364 | for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) { |
| 365 | if ((i & 7) == 0) |
| 366 | seq_puts(m,"\n "); |
| 367 | seq_printf(m, "%s %08lx", buf, *res_ptr); |
| 368 | } |
| 369 | #endif |
| 370 | seq_putc(m, '\n'); |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static int proc_pcxl_dma_open(struct inode *inode, struct file *file) |
| 375 | { |
| 376 | return single_open(file, proc_pcxl_dma_show, NULL); |
| 377 | } |
| 378 | |
| 379 | static const struct file_operations proc_pcxl_dma_ops = { |
| 380 | .owner = THIS_MODULE, |
| 381 | .open = proc_pcxl_dma_open, |
| 382 | .read = seq_read, |
| 383 | .llseek = seq_lseek, |
| 384 | .release = single_release, |
| 385 | }; |
| 386 | |
| 387 | static int __init |
| 388 | pcxl_dma_init(void) |
| 389 | { |
| 390 | if (pcxl_dma_start == 0) |
| 391 | return 0; |
| 392 | |
| 393 | spin_lock_init(&pcxl_res_lock); |
| 394 | pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); |
| 395 | pcxl_res_hint = 0; |
| 396 | pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, |
| 397 | get_order(pcxl_res_size)); |
| 398 | memset(pcxl_res_map, 0, pcxl_res_size); |
| 399 | proc_gsc_root = proc_mkdir("gsc", NULL); |
| 400 | if (!proc_gsc_root) |
| 401 | printk(KERN_WARNING |
| 402 | "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); |
| 403 | else { |
| 404 | struct proc_dir_entry* ent; |
| 405 | ent = proc_create("pcxl_dma", 0, proc_gsc_root, |
| 406 | &proc_pcxl_dma_ops); |
| 407 | if (!ent) |
| 408 | printk(KERN_WARNING |
| 409 | "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); |
| 410 | } |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | __initcall(pcxl_dma_init); |
| 415 | |
| 416 | static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) |
| 417 | { |
| 418 | unsigned long vaddr; |
| 419 | unsigned long paddr; |
| 420 | int order; |
| 421 | |
| 422 | order = get_order(size); |
| 423 | size = 1 << (order + PAGE_SHIFT); |
| 424 | vaddr = pcxl_alloc_range(size); |
| 425 | paddr = __get_free_pages(flag, order); |
| 426 | flush_kernel_dcache_range(paddr, size); |
| 427 | paddr = __pa(paddr); |
| 428 | map_uncached_pages(vaddr, size, paddr); |
| 429 | *dma_handle = (dma_addr_t) paddr; |
| 430 | |
| 431 | #if 0 |
| 432 | /* This probably isn't needed to support EISA cards. |
| 433 | ** ISA cards will certainly only support 24-bit DMA addressing. |
| 434 | ** Not clear if we can, want, or need to support ISA. |
| 435 | */ |
| 436 | if (!dev || *dev->coherent_dma_mask < 0xffffffff) |
| 437 | gfp |= GFP_DMA; |
| 438 | #endif |
| 439 | return (void *)vaddr; |
| 440 | } |
| 441 | |
| 442 | static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) |
| 443 | { |
| 444 | int order; |
| 445 | |
| 446 | order = get_order(size); |
| 447 | size = 1 << (order + PAGE_SHIFT); |
| 448 | unmap_uncached_pages((unsigned long)vaddr, size); |
| 449 | pcxl_free_range((unsigned long)vaddr, size); |
| 450 | free_pages((unsigned long)__va(dma_handle), order); |
| 451 | } |
| 452 | |
| 453 | static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction) |
| 454 | { |
| 455 | BUG_ON(direction == DMA_NONE); |
| 456 | |
| 457 | flush_kernel_dcache_range((unsigned long) addr, size); |
| 458 | return virt_to_phys(addr); |
| 459 | } |
| 460 | |
| 461 | static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) |
| 462 | { |
| 463 | BUG_ON(direction == DMA_NONE); |
| 464 | |
| 465 | if (direction == DMA_TO_DEVICE) |
| 466 | return; |
| 467 | |
| 468 | /* |
| 469 | * For PCI_DMA_FROMDEVICE this flush is not necessary for the |
| 470 | * simple map/unmap case. However, it IS necessary if if |
| 471 | * pci_dma_sync_single_* has been called and the buffer reused. |
| 472 | */ |
| 473 | |
| 474 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 479 | { |
| 480 | int i; |
| 481 | |
| 482 | BUG_ON(direction == DMA_NONE); |
| 483 | |
| 484 | for (i = 0; i < nents; i++, sglist++ ) { |
| 485 | unsigned long vaddr = sg_virt_addr(sglist); |
| 486 | sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); |
| 487 | sg_dma_len(sglist) = sglist->length; |
| 488 | flush_kernel_dcache_range(vaddr, sglist->length); |
| 489 | } |
| 490 | return nents; |
| 491 | } |
| 492 | |
| 493 | static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 494 | { |
| 495 | int i; |
| 496 | |
| 497 | BUG_ON(direction == DMA_NONE); |
| 498 | |
| 499 | if (direction == DMA_TO_DEVICE) |
| 500 | return; |
| 501 | |
| 502 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 503 | |
| 504 | for (i = 0; i < nents; i++, sglist++ ) |
| 505 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 506 | return; |
| 507 | } |
| 508 | |
| 509 | static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) |
| 510 | { |
| 511 | BUG_ON(direction == DMA_NONE); |
| 512 | |
| 513 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); |
| 514 | } |
| 515 | |
| 516 | static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) |
| 517 | { |
| 518 | BUG_ON(direction == DMA_NONE); |
| 519 | |
| 520 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); |
| 521 | } |
| 522 | |
| 523 | static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 524 | { |
| 525 | int i; |
| 526 | |
| 527 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 528 | |
| 529 | for (i = 0; i < nents; i++, sglist++ ) |
| 530 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 531 | } |
| 532 | |
| 533 | static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 534 | { |
| 535 | int i; |
| 536 | |
| 537 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 538 | |
| 539 | for (i = 0; i < nents; i++, sglist++ ) |
| 540 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 541 | } |
| 542 | |
| 543 | struct hppa_dma_ops pcxl_dma_ops = { |
| 544 | .dma_supported = pa11_dma_supported, |
| 545 | .alloc_consistent = pa11_dma_alloc_consistent, |
| 546 | .alloc_noncoherent = pa11_dma_alloc_consistent, |
| 547 | .free_consistent = pa11_dma_free_consistent, |
| 548 | .map_single = pa11_dma_map_single, |
| 549 | .unmap_single = pa11_dma_unmap_single, |
| 550 | .map_sg = pa11_dma_map_sg, |
| 551 | .unmap_sg = pa11_dma_unmap_sg, |
| 552 | .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, |
| 553 | .dma_sync_single_for_device = pa11_dma_sync_single_for_device, |
| 554 | .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, |
| 555 | .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, |
| 556 | }; |
| 557 | |
| 558 | static void *fail_alloc_consistent(struct device *dev, size_t size, |
| 559 | dma_addr_t *dma_handle, gfp_t flag) |
| 560 | { |
| 561 | return NULL; |
| 562 | } |
| 563 | |
| 564 | static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size, |
| 565 | dma_addr_t *dma_handle, gfp_t flag) |
| 566 | { |
| 567 | void *addr; |
| 568 | |
| 569 | addr = (void *)__get_free_pages(flag, get_order(size)); |
| 570 | if (addr) |
| 571 | *dma_handle = (dma_addr_t)virt_to_phys(addr); |
| 572 | |
| 573 | return addr; |
| 574 | } |
| 575 | |
| 576 | static void pa11_dma_free_noncoherent(struct device *dev, size_t size, |
| 577 | void *vaddr, dma_addr_t iova) |
| 578 | { |
| 579 | free_pages((unsigned long)vaddr, get_order(size)); |
| 580 | return; |
| 581 | } |
| 582 | |
| 583 | struct hppa_dma_ops pcx_dma_ops = { |
| 584 | .dma_supported = pa11_dma_supported, |
| 585 | .alloc_consistent = fail_alloc_consistent, |
| 586 | .alloc_noncoherent = pa11_dma_alloc_noncoherent, |
| 587 | .free_consistent = pa11_dma_free_noncoherent, |
| 588 | .map_single = pa11_dma_map_single, |
| 589 | .unmap_single = pa11_dma_unmap_single, |
| 590 | .map_sg = pa11_dma_map_sg, |
| 591 | .unmap_sg = pa11_dma_unmap_sg, |
| 592 | .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, |
| 593 | .dma_sync_single_for_device = pa11_dma_sync_single_for_device, |
| 594 | .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, |
| 595 | .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, |
| 596 | }; |