| 1 | /* |
| 2 | * ioport.c: Simple io mapping allocator. |
| 3 | * |
| 4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| 5 | * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) |
| 6 | * |
| 7 | * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev. |
| 8 | * |
| 9 | * 2000/01/29 |
| 10 | * <rth> zait: as long as pci_alloc_consistent produces something addressable, |
| 11 | * things are ok. |
| 12 | * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a |
| 13 | * pointer into the big page mapping |
| 14 | * <rth> zait: so what? |
| 15 | * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page())) |
| 16 | * <zaitcev> Hmm |
| 17 | * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())). |
| 18 | * So far so good. |
| 19 | * <zaitcev> Now, driver calls pci_free_consistent(with result of |
| 20 | * remap_it_my_way()). |
| 21 | * <zaitcev> How do you find the address to pass to free_pages()? |
| 22 | * <rth> zait: walk the page tables? It's only two or three level after all. |
| 23 | * <rth> zait: you have to walk them anyway to remove the mapping. |
| 24 | * <zaitcev> Hmm |
| 25 | * <zaitcev> Sounds reasonable |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/ioport.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/pci.h> /* struct pci_dev */ |
| 37 | #include <linux/proc_fs.h> |
| 38 | #include <linux/scatterlist.h> |
| 39 | #include <linux/of_device.h> |
| 40 | |
| 41 | #include <asm/io.h> |
| 42 | #include <asm/vaddrs.h> |
| 43 | #include <asm/oplib.h> |
| 44 | #include <asm/prom.h> |
| 45 | #include <asm/page.h> |
| 46 | #include <asm/pgalloc.h> |
| 47 | #include <asm/dma.h> |
| 48 | #include <asm/iommu.h> |
| 49 | #include <asm/io-unit.h> |
| 50 | |
| 51 | #include "dma.h" |
| 52 | |
| 53 | #define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */ |
| 54 | |
| 55 | static struct resource *_sparc_find_resource(struct resource *r, |
| 56 | unsigned long); |
| 57 | |
| 58 | static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz); |
| 59 | static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, |
| 60 | unsigned long size, char *name); |
| 61 | static void _sparc_free_io(struct resource *res); |
| 62 | |
| 63 | static void register_proc_sparc_ioport(void); |
| 64 | |
| 65 | /* This points to the next to use virtual memory for DVMA mappings */ |
| 66 | static struct resource _sparc_dvma = { |
| 67 | .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1 |
| 68 | }; |
| 69 | /* This points to the start of I/O mappings, cluable from outside. */ |
| 70 | /*ext*/ struct resource sparc_iomap = { |
| 71 | .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1 |
| 72 | }; |
| 73 | |
| 74 | /* |
| 75 | * Our mini-allocator... |
| 76 | * Boy this is gross! We need it because we must map I/O for |
| 77 | * timers and interrupt controller before the kmalloc is available. |
| 78 | */ |
| 79 | |
| 80 | #define XNMLN 15 |
| 81 | #define XNRES 10 /* SS-10 uses 8 */ |
| 82 | |
| 83 | struct xresource { |
| 84 | struct resource xres; /* Must be first */ |
| 85 | int xflag; /* 1 == used */ |
| 86 | char xname[XNMLN+1]; |
| 87 | }; |
| 88 | |
| 89 | static struct xresource xresv[XNRES]; |
| 90 | |
| 91 | static struct xresource *xres_alloc(void) { |
| 92 | struct xresource *xrp; |
| 93 | int n; |
| 94 | |
| 95 | xrp = xresv; |
| 96 | for (n = 0; n < XNRES; n++) { |
| 97 | if (xrp->xflag == 0) { |
| 98 | xrp->xflag = 1; |
| 99 | return xrp; |
| 100 | } |
| 101 | xrp++; |
| 102 | } |
| 103 | return NULL; |
| 104 | } |
| 105 | |
| 106 | static void xres_free(struct xresource *xrp) { |
| 107 | xrp->xflag = 0; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * These are typically used in PCI drivers |
| 112 | * which are trying to be cross-platform. |
| 113 | * |
| 114 | * Bus type is always zero on IIep. |
| 115 | */ |
| 116 | void __iomem *ioremap(unsigned long offset, unsigned long size) |
| 117 | { |
| 118 | char name[14]; |
| 119 | |
| 120 | sprintf(name, "phys_%08x", (u32)offset); |
| 121 | return _sparc_alloc_io(0, offset, size, name); |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Comlimentary to ioremap(). |
| 126 | */ |
| 127 | void iounmap(volatile void __iomem *virtual) |
| 128 | { |
| 129 | unsigned long vaddr = (unsigned long) virtual & PAGE_MASK; |
| 130 | struct resource *res; |
| 131 | |
| 132 | if ((res = _sparc_find_resource(&sparc_iomap, vaddr)) == NULL) { |
| 133 | printk("free_io/iounmap: cannot free %lx\n", vaddr); |
| 134 | return; |
| 135 | } |
| 136 | _sparc_free_io(res); |
| 137 | |
| 138 | if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) { |
| 139 | xres_free((struct xresource *)res); |
| 140 | } else { |
| 141 | kfree(res); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | void __iomem *of_ioremap(struct resource *res, unsigned long offset, |
| 146 | unsigned long size, char *name) |
| 147 | { |
| 148 | return _sparc_alloc_io(res->flags & 0xF, |
| 149 | res->start + offset, |
| 150 | size, name); |
| 151 | } |
| 152 | EXPORT_SYMBOL(of_ioremap); |
| 153 | |
| 154 | void of_iounmap(struct resource *res, void __iomem *base, unsigned long size) |
| 155 | { |
| 156 | iounmap(base); |
| 157 | } |
| 158 | EXPORT_SYMBOL(of_iounmap); |
| 159 | |
| 160 | /* |
| 161 | * Meat of mapping |
| 162 | */ |
| 163 | static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, |
| 164 | unsigned long size, char *name) |
| 165 | { |
| 166 | static int printed_full; |
| 167 | struct xresource *xres; |
| 168 | struct resource *res; |
| 169 | char *tack; |
| 170 | int tlen; |
| 171 | void __iomem *va; /* P3 diag */ |
| 172 | |
| 173 | if (name == NULL) name = "???"; |
| 174 | |
| 175 | if ((xres = xres_alloc()) != 0) { |
| 176 | tack = xres->xname; |
| 177 | res = &xres->xres; |
| 178 | } else { |
| 179 | if (!printed_full) { |
| 180 | printk("ioremap: done with statics, switching to malloc\n"); |
| 181 | printed_full = 1; |
| 182 | } |
| 183 | tlen = strlen(name); |
| 184 | tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL); |
| 185 | if (tack == NULL) return NULL; |
| 186 | memset(tack, 0, sizeof(struct resource)); |
| 187 | res = (struct resource *) tack; |
| 188 | tack += sizeof (struct resource); |
| 189 | } |
| 190 | |
| 191 | strlcpy(tack, name, XNMLN+1); |
| 192 | res->name = tack; |
| 193 | |
| 194 | va = _sparc_ioremap(res, busno, phys, size); |
| 195 | /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */ |
| 196 | return va; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | */ |
| 201 | static void __iomem * |
| 202 | _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz) |
| 203 | { |
| 204 | unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK); |
| 205 | |
| 206 | if (allocate_resource(&sparc_iomap, res, |
| 207 | (offset + sz + PAGE_SIZE-1) & PAGE_MASK, |
| 208 | sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) { |
| 209 | /* Usually we cannot see printks in this case. */ |
| 210 | prom_printf("alloc_io_res(%s): cannot occupy\n", |
| 211 | (res->name != NULL)? res->name: "???"); |
| 212 | prom_halt(); |
| 213 | } |
| 214 | |
| 215 | pa &= PAGE_MASK; |
| 216 | sparc_mapiorange(bus, pa, res->start, res->end - res->start + 1); |
| 217 | |
| 218 | return (void __iomem *)(unsigned long)(res->start + offset); |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Comlimentary to _sparc_ioremap(). |
| 223 | */ |
| 224 | static void _sparc_free_io(struct resource *res) |
| 225 | { |
| 226 | unsigned long plen; |
| 227 | |
| 228 | plen = res->end - res->start + 1; |
| 229 | BUG_ON((plen & (PAGE_SIZE-1)) != 0); |
| 230 | sparc_unmapiorange(res->start, plen); |
| 231 | release_resource(res); |
| 232 | } |
| 233 | |
| 234 | #ifdef CONFIG_SBUS |
| 235 | |
| 236 | void sbus_set_sbus64(struct device *dev, int x) |
| 237 | { |
| 238 | printk("sbus_set_sbus64: unsupported\n"); |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * Allocate a chunk of memory suitable for DMA. |
| 243 | * Typically devices use them for control blocks. |
| 244 | * CPU may access them without any explicit flushing. |
| 245 | */ |
| 246 | void *sbus_alloc_consistent(struct device *dev, long len, u32 *dma_addrp) |
| 247 | { |
| 248 | struct of_device *op = to_of_device(dev); |
| 249 | unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; |
| 250 | unsigned long va; |
| 251 | struct resource *res; |
| 252 | int order; |
| 253 | |
| 254 | /* XXX why are some lengths signed, others unsigned? */ |
| 255 | if (len <= 0) { |
| 256 | return NULL; |
| 257 | } |
| 258 | /* XXX So what is maxphys for us and how do drivers know it? */ |
| 259 | if (len > 256*1024) { /* __get_free_pages() limit */ |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | order = get_order(len_total); |
| 264 | if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0) |
| 265 | goto err_nopages; |
| 266 | |
| 267 | if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) |
| 268 | goto err_nomem; |
| 269 | |
| 270 | if (allocate_resource(&_sparc_dvma, res, len_total, |
| 271 | _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { |
| 272 | printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total); |
| 273 | goto err_nova; |
| 274 | } |
| 275 | mmu_inval_dma_area(va, len_total); |
| 276 | // XXX The mmu_map_dma_area does this for us below, see comments. |
| 277 | // sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); |
| 278 | /* |
| 279 | * XXX That's where sdev would be used. Currently we load |
| 280 | * all iommu tables with the same translations. |
| 281 | */ |
| 282 | if (mmu_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0) |
| 283 | goto err_noiommu; |
| 284 | |
| 285 | res->name = op->node->name; |
| 286 | |
| 287 | return (void *)(unsigned long)res->start; |
| 288 | |
| 289 | err_noiommu: |
| 290 | release_resource(res); |
| 291 | err_nova: |
| 292 | free_pages(va, order); |
| 293 | err_nomem: |
| 294 | kfree(res); |
| 295 | err_nopages: |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | void sbus_free_consistent(struct device *dev, long n, void *p, u32 ba) |
| 300 | { |
| 301 | struct resource *res; |
| 302 | struct page *pgv; |
| 303 | |
| 304 | if ((res = _sparc_find_resource(&_sparc_dvma, |
| 305 | (unsigned long)p)) == NULL) { |
| 306 | printk("sbus_free_consistent: cannot free %p\n", p); |
| 307 | return; |
| 308 | } |
| 309 | |
| 310 | if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { |
| 311 | printk("sbus_free_consistent: unaligned va %p\n", p); |
| 312 | return; |
| 313 | } |
| 314 | |
| 315 | n = (n + PAGE_SIZE-1) & PAGE_MASK; |
| 316 | if ((res->end-res->start)+1 != n) { |
| 317 | printk("sbus_free_consistent: region 0x%lx asked 0x%lx\n", |
| 318 | (long)((res->end-res->start)+1), n); |
| 319 | return; |
| 320 | } |
| 321 | |
| 322 | release_resource(res); |
| 323 | kfree(res); |
| 324 | |
| 325 | /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */ |
| 326 | pgv = virt_to_page(p); |
| 327 | mmu_unmap_dma_area(dev, ba, n); |
| 328 | |
| 329 | __free_pages(pgv, get_order(n)); |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Map a chunk of memory so that devices can see it. |
| 334 | * CPU view of this memory may be inconsistent with |
| 335 | * a device view and explicit flushing is necessary. |
| 336 | */ |
| 337 | dma_addr_t sbus_map_single(struct device *dev, void *va, size_t len, int direction) |
| 338 | { |
| 339 | /* XXX why are some lengths signed, others unsigned? */ |
| 340 | if (len <= 0) { |
| 341 | return 0; |
| 342 | } |
| 343 | /* XXX So what is maxphys for us and how do drivers know it? */ |
| 344 | if (len > 256*1024) { /* __get_free_pages() limit */ |
| 345 | return 0; |
| 346 | } |
| 347 | return mmu_get_scsi_one(dev, va, len); |
| 348 | } |
| 349 | |
| 350 | void sbus_unmap_single(struct device *dev, dma_addr_t ba, size_t n, int direction) |
| 351 | { |
| 352 | mmu_release_scsi_one(dev, ba, n); |
| 353 | } |
| 354 | |
| 355 | int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n, int direction) |
| 356 | { |
| 357 | mmu_get_scsi_sgl(dev, sg, n); |
| 358 | |
| 359 | /* |
| 360 | * XXX sparc64 can return a partial length here. sun4c should do this |
| 361 | * but it currently panics if it can't fulfill the request - Anton |
| 362 | */ |
| 363 | return n; |
| 364 | } |
| 365 | |
| 366 | void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n, int direction) |
| 367 | { |
| 368 | mmu_release_scsi_sgl(dev, sg, n); |
| 369 | } |
| 370 | |
| 371 | void sbus_dma_sync_single_for_cpu(struct device *dev, dma_addr_t ba, size_t size, int direction) |
| 372 | { |
| 373 | } |
| 374 | |
| 375 | void sbus_dma_sync_single_for_device(struct device *dev, dma_addr_t ba, size_t size, int direction) |
| 376 | { |
| 377 | } |
| 378 | |
| 379 | static int __init sparc_register_ioport(void) |
| 380 | { |
| 381 | register_proc_sparc_ioport(); |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | arch_initcall(sparc_register_ioport); |
| 387 | |
| 388 | #endif /* CONFIG_SBUS */ |
| 389 | |
| 390 | #ifdef CONFIG_PCI |
| 391 | |
| 392 | /* Allocate and map kernel buffer using consistent mode DMA for a device. |
| 393 | * hwdev should be valid struct pci_dev pointer for PCI devices. |
| 394 | */ |
| 395 | void *pci_alloc_consistent(struct pci_dev *pdev, size_t len, dma_addr_t *pba) |
| 396 | { |
| 397 | unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK; |
| 398 | unsigned long va; |
| 399 | struct resource *res; |
| 400 | int order; |
| 401 | |
| 402 | if (len == 0) { |
| 403 | return NULL; |
| 404 | } |
| 405 | if (len > 256*1024) { /* __get_free_pages() limit */ |
| 406 | return NULL; |
| 407 | } |
| 408 | |
| 409 | order = get_order(len_total); |
| 410 | va = __get_free_pages(GFP_KERNEL, order); |
| 411 | if (va == 0) { |
| 412 | printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT); |
| 413 | return NULL; |
| 414 | } |
| 415 | |
| 416 | if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) { |
| 417 | free_pages(va, order); |
| 418 | printk("pci_alloc_consistent: no core\n"); |
| 419 | return NULL; |
| 420 | } |
| 421 | |
| 422 | if (allocate_resource(&_sparc_dvma, res, len_total, |
| 423 | _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) { |
| 424 | printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total); |
| 425 | free_pages(va, order); |
| 426 | kfree(res); |
| 427 | return NULL; |
| 428 | } |
| 429 | mmu_inval_dma_area(va, len_total); |
| 430 | #if 0 |
| 431 | /* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n", |
| 432 | (long)va, (long)res->start, (long)virt_to_phys(va), len_total); |
| 433 | #endif |
| 434 | sparc_mapiorange(0, virt_to_phys(va), res->start, len_total); |
| 435 | |
| 436 | *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */ |
| 437 | return (void *) res->start; |
| 438 | } |
| 439 | |
| 440 | /* Free and unmap a consistent DMA buffer. |
| 441 | * cpu_addr is what was returned from pci_alloc_consistent, |
| 442 | * size must be the same as what as passed into pci_alloc_consistent, |
| 443 | * and likewise dma_addr must be the same as what *dma_addrp was set to. |
| 444 | * |
| 445 | * References to the memory and mappings associated with cpu_addr/dma_addr |
| 446 | * past this call are illegal. |
| 447 | */ |
| 448 | void pci_free_consistent(struct pci_dev *pdev, size_t n, void *p, dma_addr_t ba) |
| 449 | { |
| 450 | struct resource *res; |
| 451 | unsigned long pgp; |
| 452 | |
| 453 | if ((res = _sparc_find_resource(&_sparc_dvma, |
| 454 | (unsigned long)p)) == NULL) { |
| 455 | printk("pci_free_consistent: cannot free %p\n", p); |
| 456 | return; |
| 457 | } |
| 458 | |
| 459 | if (((unsigned long)p & (PAGE_SIZE-1)) != 0) { |
| 460 | printk("pci_free_consistent: unaligned va %p\n", p); |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | n = (n + PAGE_SIZE-1) & PAGE_MASK; |
| 465 | if ((res->end-res->start)+1 != n) { |
| 466 | printk("pci_free_consistent: region 0x%lx asked 0x%lx\n", |
| 467 | (long)((res->end-res->start)+1), (long)n); |
| 468 | return; |
| 469 | } |
| 470 | |
| 471 | pgp = (unsigned long) phys_to_virt(ba); /* bus_to_virt actually */ |
| 472 | mmu_inval_dma_area(pgp, n); |
| 473 | sparc_unmapiorange((unsigned long)p, n); |
| 474 | |
| 475 | release_resource(res); |
| 476 | kfree(res); |
| 477 | |
| 478 | free_pages(pgp, get_order(n)); |
| 479 | } |
| 480 | |
| 481 | /* Map a single buffer of the indicated size for DMA in streaming mode. |
| 482 | * The 32-bit bus address to use is returned. |
| 483 | * |
| 484 | * Once the device is given the dma address, the device owns this memory |
| 485 | * until either pci_unmap_single or pci_dma_sync_single_* is performed. |
| 486 | */ |
| 487 | dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, |
| 488 | int direction) |
| 489 | { |
| 490 | BUG_ON(direction == PCI_DMA_NONE); |
| 491 | /* IIep is write-through, not flushing. */ |
| 492 | return virt_to_phys(ptr); |
| 493 | } |
| 494 | |
| 495 | /* Unmap a single streaming mode DMA translation. The dma_addr and size |
| 496 | * must match what was provided for in a previous pci_map_single call. All |
| 497 | * other usages are undefined. |
| 498 | * |
| 499 | * After this call, reads by the cpu to the buffer are guaranteed to see |
| 500 | * whatever the device wrote there. |
| 501 | */ |
| 502 | void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t ba, size_t size, |
| 503 | int direction) |
| 504 | { |
| 505 | BUG_ON(direction == PCI_DMA_NONE); |
| 506 | if (direction != PCI_DMA_TODEVICE) { |
| 507 | mmu_inval_dma_area((unsigned long)phys_to_virt(ba), |
| 508 | (size + PAGE_SIZE-1) & PAGE_MASK); |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Same as pci_map_single, but with pages. |
| 514 | */ |
| 515 | dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page, |
| 516 | unsigned long offset, size_t size, int direction) |
| 517 | { |
| 518 | BUG_ON(direction == PCI_DMA_NONE); |
| 519 | /* IIep is write-through, not flushing. */ |
| 520 | return page_to_phys(page) + offset; |
| 521 | } |
| 522 | |
| 523 | void pci_unmap_page(struct pci_dev *hwdev, |
| 524 | dma_addr_t dma_address, size_t size, int direction) |
| 525 | { |
| 526 | BUG_ON(direction == PCI_DMA_NONE); |
| 527 | /* mmu_inval_dma_area XXX */ |
| 528 | } |
| 529 | |
| 530 | /* Map a set of buffers described by scatterlist in streaming |
| 531 | * mode for DMA. This is the scather-gather version of the |
| 532 | * above pci_map_single interface. Here the scatter gather list |
| 533 | * elements are each tagged with the appropriate dma address |
| 534 | * and length. They are obtained via sg_dma_{address,length}(SG). |
| 535 | * |
| 536 | * NOTE: An implementation may be able to use a smaller number of |
| 537 | * DMA address/length pairs than there are SG table elements. |
| 538 | * (for example via virtual mapping capabilities) |
| 539 | * The routine returns the number of addr/length pairs actually |
| 540 | * used, at most nents. |
| 541 | * |
| 542 | * Device ownership issues as mentioned above for pci_map_single are |
| 543 | * the same here. |
| 544 | */ |
| 545 | int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, |
| 546 | int direction) |
| 547 | { |
| 548 | struct scatterlist *sg; |
| 549 | int n; |
| 550 | |
| 551 | BUG_ON(direction == PCI_DMA_NONE); |
| 552 | /* IIep is write-through, not flushing. */ |
| 553 | for_each_sg(sgl, sg, nents, n) { |
| 554 | BUG_ON(page_address(sg_page(sg)) == NULL); |
| 555 | sg->dvma_address = virt_to_phys(sg_virt(sg)); |
| 556 | sg->dvma_length = sg->length; |
| 557 | } |
| 558 | return nents; |
| 559 | } |
| 560 | |
| 561 | /* Unmap a set of streaming mode DMA translations. |
| 562 | * Again, cpu read rules concerning calls here are the same as for |
| 563 | * pci_unmap_single() above. |
| 564 | */ |
| 565 | void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, |
| 566 | int direction) |
| 567 | { |
| 568 | struct scatterlist *sg; |
| 569 | int n; |
| 570 | |
| 571 | BUG_ON(direction == PCI_DMA_NONE); |
| 572 | if (direction != PCI_DMA_TODEVICE) { |
| 573 | for_each_sg(sgl, sg, nents, n) { |
| 574 | BUG_ON(page_address(sg_page(sg)) == NULL); |
| 575 | mmu_inval_dma_area( |
| 576 | (unsigned long) page_address(sg_page(sg)), |
| 577 | (sg->length + PAGE_SIZE-1) & PAGE_MASK); |
| 578 | } |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* Make physical memory consistent for a single |
| 583 | * streaming mode DMA translation before or after a transfer. |
| 584 | * |
| 585 | * If you perform a pci_map_single() but wish to interrogate the |
| 586 | * buffer using the cpu, yet do not wish to teardown the PCI dma |
| 587 | * mapping, you must call this function before doing so. At the |
| 588 | * next point you give the PCI dma address back to the card, you |
| 589 | * must first perform a pci_dma_sync_for_device, and then the |
| 590 | * device again owns the buffer. |
| 591 | */ |
| 592 | void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) |
| 593 | { |
| 594 | BUG_ON(direction == PCI_DMA_NONE); |
| 595 | if (direction != PCI_DMA_TODEVICE) { |
| 596 | mmu_inval_dma_area((unsigned long)phys_to_virt(ba), |
| 597 | (size + PAGE_SIZE-1) & PAGE_MASK); |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t size, int direction) |
| 602 | { |
| 603 | BUG_ON(direction == PCI_DMA_NONE); |
| 604 | if (direction != PCI_DMA_TODEVICE) { |
| 605 | mmu_inval_dma_area((unsigned long)phys_to_virt(ba), |
| 606 | (size + PAGE_SIZE-1) & PAGE_MASK); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | /* Make physical memory consistent for a set of streaming |
| 611 | * mode DMA translations after a transfer. |
| 612 | * |
| 613 | * The same as pci_dma_sync_single_* but for a scatter-gather list, |
| 614 | * same rules and usage. |
| 615 | */ |
| 616 | void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction) |
| 617 | { |
| 618 | struct scatterlist *sg; |
| 619 | int n; |
| 620 | |
| 621 | BUG_ON(direction == PCI_DMA_NONE); |
| 622 | if (direction != PCI_DMA_TODEVICE) { |
| 623 | for_each_sg(sgl, sg, nents, n) { |
| 624 | BUG_ON(page_address(sg_page(sg)) == NULL); |
| 625 | mmu_inval_dma_area( |
| 626 | (unsigned long) page_address(sg_page(sg)), |
| 627 | (sg->length + PAGE_SIZE-1) & PAGE_MASK); |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction) |
| 633 | { |
| 634 | struct scatterlist *sg; |
| 635 | int n; |
| 636 | |
| 637 | BUG_ON(direction == PCI_DMA_NONE); |
| 638 | if (direction != PCI_DMA_TODEVICE) { |
| 639 | for_each_sg(sgl, sg, nents, n) { |
| 640 | BUG_ON(page_address(sg_page(sg)) == NULL); |
| 641 | mmu_inval_dma_area( |
| 642 | (unsigned long) page_address(sg_page(sg)), |
| 643 | (sg->length + PAGE_SIZE-1) & PAGE_MASK); |
| 644 | } |
| 645 | } |
| 646 | } |
| 647 | #endif /* CONFIG_PCI */ |
| 648 | |
| 649 | #ifdef CONFIG_PROC_FS |
| 650 | |
| 651 | static int |
| 652 | _sparc_io_get_info(char *buf, char **start, off_t fpos, int length, int *eof, |
| 653 | void *data) |
| 654 | { |
| 655 | char *p = buf, *e = buf + length; |
| 656 | struct resource *r; |
| 657 | const char *nm; |
| 658 | |
| 659 | for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) { |
| 660 | if (p + 32 >= e) /* Better than nothing */ |
| 661 | break; |
| 662 | if ((nm = r->name) == 0) nm = "???"; |
| 663 | p += sprintf(p, "%016llx-%016llx: %s\n", |
| 664 | (unsigned long long)r->start, |
| 665 | (unsigned long long)r->end, nm); |
| 666 | } |
| 667 | |
| 668 | return p-buf; |
| 669 | } |
| 670 | |
| 671 | #endif /* CONFIG_PROC_FS */ |
| 672 | |
| 673 | /* |
| 674 | * This is a version of find_resource and it belongs to kernel/resource.c. |
| 675 | * Until we have agreement with Linus and Martin, it lingers here. |
| 676 | * |
| 677 | * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case. |
| 678 | * This probably warrants some sort of hashing. |
| 679 | */ |
| 680 | static struct resource *_sparc_find_resource(struct resource *root, |
| 681 | unsigned long hit) |
| 682 | { |
| 683 | struct resource *tmp; |
| 684 | |
| 685 | for (tmp = root->child; tmp != 0; tmp = tmp->sibling) { |
| 686 | if (tmp->start <= hit && tmp->end >= hit) |
| 687 | return tmp; |
| 688 | } |
| 689 | return NULL; |
| 690 | } |
| 691 | |
| 692 | static void register_proc_sparc_ioport(void) |
| 693 | { |
| 694 | #ifdef CONFIG_PROC_FS |
| 695 | create_proc_read_entry("io_map",0,NULL,_sparc_io_get_info,&sparc_iomap); |
| 696 | create_proc_read_entry("dvma_map",0,NULL,_sparc_io_get_info,&_sparc_dvma); |
| 697 | #endif |
| 698 | } |