Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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). |
Randy Dunlap | 5872fb9 | 2009-01-29 16:28:02 -0800 | [diff] [blame] | 5 | ** See Documentation/PCI/PCI-DMA-mapping.txt for interface definitions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/mm.h> |
| 22 | #include <linux/pci.h> |
| 23 | #include <linux/proc_fs.h> |
Alexey Dobriyan | 27f282b | 2007-03-17 19:28:27 +0300 | [diff] [blame] | 24 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/slab.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/types.h> |
FUJITA Tomonori | b61e8f4 | 2007-10-23 09:30:28 +0200 | [diff] [blame] | 28 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | #include <asm/cacheflush.h> |
| 31 | #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ |
| 32 | #include <asm/io.h> |
| 33 | #include <asm/page.h> /* get_order */ |
| 34 | #include <asm/pgalloc.h> |
| 35 | #include <asm/uaccess.h> |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 36 | #include <asm/tlbflush.h> /* for purge_tlb_*() macros */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Helge Deller | 8039de1 | 2006-01-10 20:35:03 -0500 | [diff] [blame] | 38 | static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; |
Helge Deller | 8039de1 | 2006-01-10 20:35:03 -0500 | [diff] [blame] | 39 | static unsigned long pcxl_used_bytes __read_mostly = 0; |
| 40 | static unsigned long pcxl_used_pages __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ |
| 43 | static spinlock_t pcxl_res_lock; |
| 44 | static char *pcxl_res_map; |
| 45 | static int pcxl_res_hint; |
| 46 | static int pcxl_res_size; |
| 47 | |
| 48 | #ifdef DEBUG_PCXL_RESOURCE |
| 49 | #define DBG_RES(x...) printk(x) |
| 50 | #else |
| 51 | #define DBG_RES(x...) |
| 52 | #endif |
| 53 | |
| 54 | |
| 55 | /* |
| 56 | ** Dump a hex representation of the resource map. |
| 57 | */ |
| 58 | |
| 59 | #ifdef DUMP_RESMAP |
| 60 | static |
| 61 | void dump_resmap(void) |
| 62 | { |
| 63 | u_long *res_ptr = (unsigned long *)pcxl_res_map; |
| 64 | u_long i = 0; |
| 65 | |
| 66 | printk("res_map: "); |
| 67 | for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr) |
| 68 | printk("%08lx ", *res_ptr); |
| 69 | |
| 70 | printk("\n"); |
| 71 | } |
| 72 | #else |
| 73 | static inline void dump_resmap(void) {;} |
| 74 | #endif |
| 75 | |
| 76 | static int pa11_dma_supported( struct device *dev, u64 mask) |
| 77 | { |
| 78 | return 1; |
| 79 | } |
| 80 | |
| 81 | static inline int map_pte_uncached(pte_t * pte, |
| 82 | unsigned long vaddr, |
| 83 | unsigned long size, unsigned long *paddr_ptr) |
| 84 | { |
| 85 | unsigned long end; |
| 86 | unsigned long orig_vaddr = vaddr; |
| 87 | |
| 88 | vaddr &= ~PMD_MASK; |
| 89 | end = vaddr + size; |
| 90 | if (end > PMD_SIZE) |
| 91 | end = PMD_SIZE; |
| 92 | do { |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 93 | unsigned long flags; |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | if (!pte_none(*pte)) |
| 96 | printk(KERN_ERR "map_pte_uncached: page already exists\n"); |
| 97 | set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 98 | purge_tlb_start(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | pdtlb_kernel(orig_vaddr); |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 100 | purge_tlb_end(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | vaddr += PAGE_SIZE; |
| 102 | orig_vaddr += PAGE_SIZE; |
| 103 | (*paddr_ptr) += PAGE_SIZE; |
| 104 | pte++; |
| 105 | } while (vaddr < end); |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr, |
| 110 | unsigned long size, unsigned long *paddr_ptr) |
| 111 | { |
| 112 | unsigned long end; |
| 113 | unsigned long orig_vaddr = vaddr; |
| 114 | |
| 115 | vaddr &= ~PGDIR_MASK; |
| 116 | end = vaddr + size; |
| 117 | if (end > PGDIR_SIZE) |
| 118 | end = PGDIR_SIZE; |
| 119 | do { |
Hugh Dickins | 872fec1 | 2005-10-29 18:16:21 -0700 | [diff] [blame] | 120 | pte_t * pte = pte_alloc_kernel(pmd, vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | if (!pte) |
| 122 | return -ENOMEM; |
| 123 | if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr)) |
| 124 | return -ENOMEM; |
| 125 | vaddr = (vaddr + PMD_SIZE) & PMD_MASK; |
| 126 | orig_vaddr += PMD_SIZE; |
| 127 | pmd++; |
| 128 | } while (vaddr < end); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, |
| 133 | unsigned long paddr) |
| 134 | { |
| 135 | pgd_t * dir; |
| 136 | unsigned long end = vaddr + size; |
| 137 | |
| 138 | dir = pgd_offset_k(vaddr); |
| 139 | do { |
| 140 | pmd_t *pmd; |
| 141 | |
| 142 | pmd = pmd_alloc(NULL, dir, vaddr); |
| 143 | if (!pmd) |
| 144 | return -ENOMEM; |
| 145 | if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) |
| 146 | return -ENOMEM; |
| 147 | vaddr = vaddr + PGDIR_SIZE; |
| 148 | dir++; |
| 149 | } while (vaddr && (vaddr < end)); |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, |
| 154 | unsigned long size) |
| 155 | { |
| 156 | pte_t * pte; |
| 157 | unsigned long end; |
| 158 | unsigned long orig_vaddr = vaddr; |
| 159 | |
| 160 | if (pmd_none(*pmd)) |
| 161 | return; |
| 162 | if (pmd_bad(*pmd)) { |
| 163 | pmd_ERROR(*pmd); |
| 164 | pmd_clear(pmd); |
| 165 | return; |
| 166 | } |
| 167 | pte = pte_offset_map(pmd, vaddr); |
| 168 | vaddr &= ~PMD_MASK; |
| 169 | end = vaddr + size; |
| 170 | if (end > PMD_SIZE) |
| 171 | end = PMD_SIZE; |
| 172 | do { |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 173 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | pte_t page = *pte; |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | pte_clear(&init_mm, vaddr, pte); |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 177 | purge_tlb_start(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | pdtlb_kernel(orig_vaddr); |
Helge Deller | e82a3b7 | 2009-06-16 20:51:48 +0000 | [diff] [blame] | 179 | purge_tlb_end(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | vaddr += PAGE_SIZE; |
| 181 | orig_vaddr += PAGE_SIZE; |
| 182 | pte++; |
| 183 | if (pte_none(page) || pte_present(page)) |
| 184 | continue; |
| 185 | printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); |
| 186 | } while (vaddr < end); |
| 187 | } |
| 188 | |
| 189 | static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, |
| 190 | unsigned long size) |
| 191 | { |
| 192 | pmd_t * pmd; |
| 193 | unsigned long end; |
| 194 | unsigned long orig_vaddr = vaddr; |
| 195 | |
| 196 | if (pgd_none(*dir)) |
| 197 | return; |
| 198 | if (pgd_bad(*dir)) { |
| 199 | pgd_ERROR(*dir); |
| 200 | pgd_clear(dir); |
| 201 | return; |
| 202 | } |
| 203 | pmd = pmd_offset(dir, vaddr); |
| 204 | vaddr &= ~PGDIR_MASK; |
| 205 | end = vaddr + size; |
| 206 | if (end > PGDIR_SIZE) |
| 207 | end = PGDIR_SIZE; |
| 208 | do { |
| 209 | unmap_uncached_pte(pmd, orig_vaddr, end - vaddr); |
| 210 | vaddr = (vaddr + PMD_SIZE) & PMD_MASK; |
| 211 | orig_vaddr += PMD_SIZE; |
| 212 | pmd++; |
| 213 | } while (vaddr < end); |
| 214 | } |
| 215 | |
| 216 | static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) |
| 217 | { |
| 218 | pgd_t * dir; |
| 219 | unsigned long end = vaddr + size; |
| 220 | |
| 221 | dir = pgd_offset_k(vaddr); |
| 222 | do { |
| 223 | unmap_uncached_pmd(dir, vaddr, end - vaddr); |
| 224 | vaddr = vaddr + PGDIR_SIZE; |
| 225 | dir++; |
| 226 | } while (vaddr && (vaddr < end)); |
| 227 | } |
| 228 | |
| 229 | #define PCXL_SEARCH_LOOP(idx, mask, size) \ |
| 230 | for(; res_ptr < res_end; ++res_ptr) \ |
| 231 | { \ |
| 232 | if(0 == ((*res_ptr) & mask)) { \ |
| 233 | *res_ptr |= mask; \ |
| 234 | idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \ |
| 235 | pcxl_res_hint = idx + (size >> 3); \ |
| 236 | goto resource_found; \ |
| 237 | } \ |
| 238 | } |
| 239 | |
| 240 | #define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \ |
| 241 | u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \ |
| 242 | u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \ |
| 243 | PCXL_SEARCH_LOOP(idx, mask, size); \ |
| 244 | res_ptr = (u##size *)&pcxl_res_map[0]; \ |
| 245 | PCXL_SEARCH_LOOP(idx, mask, size); \ |
| 246 | } |
| 247 | |
| 248 | unsigned long |
| 249 | pcxl_alloc_range(size_t size) |
| 250 | { |
| 251 | int res_idx; |
| 252 | u_long mask, flags; |
| 253 | unsigned int pages_needed = size >> PAGE_SHIFT; |
| 254 | |
| 255 | mask = (u_long) -1L; |
| 256 | mask >>= BITS_PER_LONG - pages_needed; |
| 257 | |
| 258 | DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", |
| 259 | size, pages_needed, mask); |
| 260 | |
| 261 | spin_lock_irqsave(&pcxl_res_lock, flags); |
| 262 | |
| 263 | if(pages_needed <= 8) { |
| 264 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 8); |
| 265 | } else if(pages_needed <= 16) { |
| 266 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 16); |
| 267 | } else if(pages_needed <= 32) { |
| 268 | PCXL_FIND_FREE_MAPPING(res_idx, mask, 32); |
| 269 | } else { |
| 270 | panic("%s: pcxl_alloc_range() Too many pages to map.\n", |
| 271 | __FILE__); |
| 272 | } |
| 273 | |
| 274 | dump_resmap(); |
| 275 | panic("%s: pcxl_alloc_range() out of dma mapping resources\n", |
| 276 | __FILE__); |
| 277 | |
| 278 | resource_found: |
| 279 | |
| 280 | DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n", |
| 281 | res_idx, mask, pcxl_res_hint); |
| 282 | |
| 283 | pcxl_used_pages += pages_needed; |
| 284 | pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1); |
| 285 | |
| 286 | spin_unlock_irqrestore(&pcxl_res_lock, flags); |
| 287 | |
| 288 | dump_resmap(); |
| 289 | |
| 290 | /* |
| 291 | ** return the corresponding vaddr in the pcxl dma map |
| 292 | */ |
| 293 | return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3))); |
| 294 | } |
| 295 | |
| 296 | #define PCXL_FREE_MAPPINGS(idx, m, size) \ |
| 297 | u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \ |
| 298 | /* BUG_ON((*res_ptr & m) != m); */ \ |
| 299 | *res_ptr &= ~m; |
| 300 | |
| 301 | /* |
| 302 | ** clear bits in the pcxl resource map |
| 303 | */ |
| 304 | static void |
| 305 | pcxl_free_range(unsigned long vaddr, size_t size) |
| 306 | { |
| 307 | u_long mask, flags; |
| 308 | unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3); |
| 309 | unsigned int pages_mapped = size >> PAGE_SHIFT; |
| 310 | |
| 311 | mask = (u_long) -1L; |
| 312 | mask >>= BITS_PER_LONG - pages_mapped; |
| 313 | |
| 314 | DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", |
| 315 | res_idx, size, pages_mapped, mask); |
| 316 | |
| 317 | spin_lock_irqsave(&pcxl_res_lock, flags); |
| 318 | |
| 319 | if(pages_mapped <= 8) { |
| 320 | PCXL_FREE_MAPPINGS(res_idx, mask, 8); |
| 321 | } else if(pages_mapped <= 16) { |
| 322 | PCXL_FREE_MAPPINGS(res_idx, mask, 16); |
| 323 | } else if(pages_mapped <= 32) { |
| 324 | PCXL_FREE_MAPPINGS(res_idx, mask, 32); |
| 325 | } else { |
| 326 | panic("%s: pcxl_free_range() Too many pages to unmap.\n", |
| 327 | __FILE__); |
| 328 | } |
| 329 | |
| 330 | pcxl_used_pages -= (pages_mapped ? pages_mapped : 1); |
| 331 | pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1); |
| 332 | |
| 333 | spin_unlock_irqrestore(&pcxl_res_lock, flags); |
| 334 | |
| 335 | dump_resmap(); |
| 336 | } |
| 337 | |
Alexey Dobriyan | 27f282b | 2007-03-17 19:28:27 +0300 | [diff] [blame] | 338 | static int proc_pcxl_dma_show(struct seq_file *m, void *v) |
| 339 | { |
| 340 | #if 0 |
| 341 | u_long i = 0; |
| 342 | unsigned long *res_ptr = (u_long *)pcxl_res_map; |
| 343 | #endif |
| 344 | unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */ |
| 345 | |
| 346 | seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n", |
| 347 | PCXL_DMA_MAP_SIZE, total_pages); |
| 348 | |
| 349 | seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size); |
| 350 | |
| 351 | seq_puts(m, " total: free: used: % used:\n"); |
| 352 | seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size, |
| 353 | pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes, |
| 354 | (pcxl_used_bytes * 100) / pcxl_res_size); |
| 355 | |
| 356 | seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages, |
| 357 | total_pages - pcxl_used_pages, pcxl_used_pages, |
| 358 | (pcxl_used_pages * 100 / total_pages)); |
| 359 | |
| 360 | #if 0 |
| 361 | seq_puts(m, "\nResource bitmap:"); |
| 362 | |
| 363 | for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) { |
| 364 | if ((i & 7) == 0) |
| 365 | seq_puts(m,"\n "); |
| 366 | seq_printf(m, "%s %08lx", buf, *res_ptr); |
| 367 | } |
| 368 | #endif |
| 369 | seq_putc(m, '\n'); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | static int proc_pcxl_dma_open(struct inode *inode, struct file *file) |
| 374 | { |
| 375 | return single_open(file, proc_pcxl_dma_show, NULL); |
| 376 | } |
| 377 | |
| 378 | static const struct file_operations proc_pcxl_dma_ops = { |
| 379 | .owner = THIS_MODULE, |
| 380 | .open = proc_pcxl_dma_open, |
| 381 | .read = seq_read, |
| 382 | .llseek = seq_lseek, |
| 383 | .release = single_release, |
| 384 | }; |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | static int __init |
| 387 | pcxl_dma_init(void) |
| 388 | { |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 389 | if (pcxl_dma_start == 0) |
| 390 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 392 | spin_lock_init(&pcxl_res_lock); |
| 393 | pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); |
| 394 | pcxl_res_hint = 0; |
| 395 | pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | get_order(pcxl_res_size)); |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 397 | memset(pcxl_res_map, 0, pcxl_res_size); |
Matthew Wilcox | e51ec24 | 2006-11-05 15:24:48 -0700 | [diff] [blame] | 398 | proc_gsc_root = proc_mkdir("gsc", NULL); |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 399 | if (!proc_gsc_root) |
| 400 | printk(KERN_WARNING |
| 401 | "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); |
| 402 | else { |
| 403 | struct proc_dir_entry* ent; |
Denis V. Lunev | 6f1c86e | 2008-04-29 01:02:25 -0700 | [diff] [blame] | 404 | ent = proc_create("pcxl_dma", 0, proc_gsc_root, |
| 405 | &proc_pcxl_dma_ops); |
| 406 | if (!ent) |
Grant Grundler | b8db800 | 2005-10-21 22:50:48 -0400 | [diff] [blame] | 407 | printk(KERN_WARNING |
| 408 | "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); |
| 409 | } |
| 410 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | __initcall(pcxl_dma_init); |
| 414 | |
Al Viro | 5c1fb41 | 2005-10-21 03:21:28 -0400 | [diff] [blame] | 415 | static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
| 417 | unsigned long vaddr; |
| 418 | unsigned long paddr; |
| 419 | int order; |
| 420 | |
| 421 | order = get_order(size); |
| 422 | size = 1 << (order + PAGE_SHIFT); |
| 423 | vaddr = pcxl_alloc_range(size); |
| 424 | paddr = __get_free_pages(flag, order); |
| 425 | flush_kernel_dcache_range(paddr, size); |
| 426 | paddr = __pa(paddr); |
| 427 | map_uncached_pages(vaddr, size, paddr); |
| 428 | *dma_handle = (dma_addr_t) paddr; |
| 429 | |
| 430 | #if 0 |
| 431 | /* This probably isn't needed to support EISA cards. |
| 432 | ** ISA cards will certainly only support 24-bit DMA addressing. |
| 433 | ** Not clear if we can, want, or need to support ISA. |
| 434 | */ |
| 435 | if (!dev || *dev->coherent_dma_mask < 0xffffffff) |
| 436 | gfp |= GFP_DMA; |
| 437 | #endif |
| 438 | return (void *)vaddr; |
| 439 | } |
| 440 | |
| 441 | static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) |
| 442 | { |
| 443 | int order; |
| 444 | |
| 445 | order = get_order(size); |
| 446 | size = 1 << (order + PAGE_SHIFT); |
| 447 | unmap_uncached_pages((unsigned long)vaddr, size); |
| 448 | pcxl_free_range((unsigned long)vaddr, size); |
| 449 | free_pages((unsigned long)__va(dma_handle), order); |
| 450 | } |
| 451 | |
| 452 | static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction) |
| 453 | { |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 454 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | flush_kernel_dcache_range((unsigned long) addr, size); |
| 457 | return virt_to_phys(addr); |
| 458 | } |
| 459 | |
| 460 | static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) |
| 461 | { |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 462 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | if (direction == DMA_TO_DEVICE) |
| 465 | return; |
| 466 | |
| 467 | /* |
| 468 | * For PCI_DMA_FROMDEVICE this flush is not necessary for the |
| 469 | * simple map/unmap case. However, it IS necessary if if |
| 470 | * pci_dma_sync_single_* has been called and the buffer reused. |
| 471 | */ |
| 472 | |
| 473 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 478 | { |
| 479 | int i; |
| 480 | |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 481 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | for (i = 0; i < nents; i++, sglist++ ) { |
| 484 | unsigned long vaddr = sg_virt_addr(sglist); |
| 485 | sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); |
| 486 | sg_dma_len(sglist) = sglist->length; |
| 487 | flush_kernel_dcache_range(vaddr, sglist->length); |
| 488 | } |
| 489 | return nents; |
| 490 | } |
| 491 | |
| 492 | static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 493 | { |
| 494 | int i; |
| 495 | |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 496 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
| 498 | if (direction == DMA_TO_DEVICE) |
| 499 | return; |
| 500 | |
| 501 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 502 | |
| 503 | for (i = 0; i < nents; i++, sglist++ ) |
| 504 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 505 | return; |
| 506 | } |
| 507 | |
| 508 | 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) |
| 509 | { |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 510 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); |
| 513 | } |
| 514 | |
| 515 | 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) |
| 516 | { |
Helge Deller | 8980a7b | 2009-01-06 12:57:01 +0100 | [diff] [blame] | 517 | BUG_ON(direction == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); |
| 520 | } |
| 521 | |
| 522 | static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 523 | { |
| 524 | int i; |
| 525 | |
| 526 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 527 | |
| 528 | for (i = 0; i < nents; i++, sglist++ ) |
| 529 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 530 | } |
| 531 | |
| 532 | static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) |
| 533 | { |
| 534 | int i; |
| 535 | |
| 536 | /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ |
| 537 | |
| 538 | for (i = 0; i < nents; i++, sglist++ ) |
| 539 | flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); |
| 540 | } |
| 541 | |
| 542 | struct hppa_dma_ops pcxl_dma_ops = { |
| 543 | .dma_supported = pa11_dma_supported, |
| 544 | .alloc_consistent = pa11_dma_alloc_consistent, |
| 545 | .alloc_noncoherent = pa11_dma_alloc_consistent, |
| 546 | .free_consistent = pa11_dma_free_consistent, |
| 547 | .map_single = pa11_dma_map_single, |
| 548 | .unmap_single = pa11_dma_unmap_single, |
| 549 | .map_sg = pa11_dma_map_sg, |
| 550 | .unmap_sg = pa11_dma_unmap_sg, |
| 551 | .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, |
| 552 | .dma_sync_single_for_device = pa11_dma_sync_single_for_device, |
| 553 | .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, |
| 554 | .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, |
| 555 | }; |
| 556 | |
| 557 | static void *fail_alloc_consistent(struct device *dev, size_t size, |
Al Viro | 5c1fb41 | 2005-10-21 03:21:28 -0400 | [diff] [blame] | 558 | dma_addr_t *dma_handle, gfp_t flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
| 560 | return NULL; |
| 561 | } |
| 562 | |
| 563 | static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size, |
Al Viro | 5c1fb41 | 2005-10-21 03:21:28 -0400 | [diff] [blame] | 564 | dma_addr_t *dma_handle, gfp_t flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | { |
Christoph Lameter | 6f7d998 | 2007-10-16 14:24:58 -0700 | [diff] [blame] | 566 | void *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Christoph Lameter | 6f7d998 | 2007-10-16 14:24:58 -0700 | [diff] [blame] | 568 | addr = (void *)__get_free_pages(flag, get_order(size)); |
| 569 | if (addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | *dma_handle = (dma_addr_t)virt_to_phys(addr); |
| 571 | |
| 572 | return addr; |
| 573 | } |
| 574 | |
| 575 | static void pa11_dma_free_noncoherent(struct device *dev, size_t size, |
| 576 | void *vaddr, dma_addr_t iova) |
| 577 | { |
Christoph Lameter | 6f7d998 | 2007-10-16 14:24:58 -0700 | [diff] [blame] | 578 | free_pages((unsigned long)vaddr, get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return; |
| 580 | } |
| 581 | |
| 582 | struct hppa_dma_ops pcx_dma_ops = { |
| 583 | .dma_supported = pa11_dma_supported, |
| 584 | .alloc_consistent = fail_alloc_consistent, |
| 585 | .alloc_noncoherent = pa11_dma_alloc_noncoherent, |
| 586 | .free_consistent = pa11_dma_free_noncoherent, |
| 587 | .map_single = pa11_dma_map_single, |
| 588 | .unmap_single = pa11_dma_unmap_single, |
| 589 | .map_sg = pa11_dma_map_sg, |
| 590 | .unmap_sg = pa11_dma_unmap_sg, |
| 591 | .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, |
| 592 | .dma_sync_single_for_device = pa11_dma_sync_single_for_device, |
| 593 | .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, |
| 594 | .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, |
| 595 | }; |