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-mapping.txt for interface definitions.
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
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)
15 ** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
20 #include <linux/init.h>
22 #include <linux/pci.h>
23 #include <linux/proc_fs.h>
24 #include <linux/slab.h>
25 #include <linux/string.h>
26 #include <linux/types.h>
28 #include <asm/cacheflush.h>
29 #include <asm/dma.h> /* for DMA_CHUNK_SIZE */
31 #include <asm/page.h> /* get_order */
32 #include <asm/pgalloc.h>
33 #include <asm/uaccess.h>
35 static struct proc_dir_entry * proc_gsc_root = NULL;
36 static int pcxl_proc_info(char *buffer, char **start, off_t offset, int length);
37 static unsigned long pcxl_used_bytes = 0;
38 static unsigned long pcxl_used_pages = 0;
40 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
41 static spinlock_t pcxl_res_lock;
42 static char *pcxl_res_map;
43 static int pcxl_res_hint;
44 static int pcxl_res_size;
46 #ifdef DEBUG_PCXL_RESOURCE
47 #define DBG_RES(x...) printk(x)
54 ** Dump a hex representation of the resource map.
59 void dump_resmap(void)
61 u_long *res_ptr = (unsigned long *)pcxl_res_map;
65 for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
66 printk("%08lx ", *res_ptr);
71 static inline void dump_resmap(void) {;}
74 static int pa11_dma_supported( struct device *dev, u64 mask)
79 static inline int map_pte_uncached(pte_t * pte,
81 unsigned long size, unsigned long *paddr_ptr)
84 unsigned long orig_vaddr = vaddr;
92 printk(KERN_ERR "map_pte_uncached: page already exists\n");
93 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
94 pdtlb_kernel(orig_vaddr);
96 orig_vaddr += PAGE_SIZE;
97 (*paddr_ptr) += PAGE_SIZE;
99 } while (vaddr < end);
103 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
104 unsigned long size, unsigned long *paddr_ptr)
107 unsigned long orig_vaddr = vaddr;
109 vaddr &= ~PGDIR_MASK;
111 if (end > PGDIR_SIZE)
114 pte_t * pte = pte_alloc_kernel(&init_mm, pmd, vaddr);
117 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
119 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
120 orig_vaddr += PMD_SIZE;
122 } while (vaddr < end);
126 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
130 unsigned long end = vaddr + size;
132 dir = pgd_offset_k(vaddr);
136 pmd = pmd_alloc(NULL, dir, vaddr);
139 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
141 vaddr = vaddr + PGDIR_SIZE;
143 } while (vaddr && (vaddr < end));
147 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
152 unsigned long orig_vaddr = vaddr;
161 pte = pte_offset_map(pmd, vaddr);
169 pdtlb_kernel(orig_vaddr);
171 orig_vaddr += PAGE_SIZE;
173 if (pte_none(page) || pte_present(page))
175 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
176 } while (vaddr < end);
179 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
184 unsigned long orig_vaddr = vaddr;
193 pmd = pmd_offset(dir, vaddr);
194 vaddr &= ~PGDIR_MASK;
196 if (end > PGDIR_SIZE)
199 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
200 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
201 orig_vaddr += PMD_SIZE;
203 } while (vaddr < end);
206 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
209 unsigned long end = vaddr + size;
211 dir = pgd_offset_k(vaddr);
213 unmap_uncached_pmd(dir, vaddr, end - vaddr);
214 vaddr = vaddr + PGDIR_SIZE;
216 } while (vaddr && (vaddr < end));
219 #define PCXL_SEARCH_LOOP(idx, mask, size) \
220 for(; res_ptr < res_end; ++res_ptr) \
222 if(0 == ((*res_ptr) & mask)) { \
224 idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
225 pcxl_res_hint = idx + (size >> 3); \
226 goto resource_found; \
230 #define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
231 u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
232 u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
233 PCXL_SEARCH_LOOP(idx, mask, size); \
234 res_ptr = (u##size *)&pcxl_res_map[0]; \
235 PCXL_SEARCH_LOOP(idx, mask, size); \
239 pcxl_alloc_range(size_t size)
243 unsigned int pages_needed = size >> PAGE_SHIFT;
245 ASSERT(pages_needed);
246 ASSERT((pages_needed * PAGE_SIZE) < DMA_CHUNK_SIZE);
247 ASSERT(pages_needed < (BITS_PER_LONG - PAGE_SHIFT));
250 mask >>= BITS_PER_LONG - pages_needed;
252 DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
253 size, pages_needed, mask);
255 spin_lock_irqsave(&pcxl_res_lock, flags);
257 if(pages_needed <= 8) {
258 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
259 } else if(pages_needed <= 16) {
260 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
261 } else if(pages_needed <= 32) {
262 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
264 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
269 panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
274 DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
275 res_idx, mask, pcxl_res_hint);
277 pcxl_used_pages += pages_needed;
278 pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
280 spin_unlock_irqrestore(&pcxl_res_lock, flags);
285 ** return the corresponding vaddr in the pcxl dma map
287 return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
290 #define PCXL_FREE_MAPPINGS(idx, m, size) \
291 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
292 ASSERT((*res_ptr & m) == m); \
296 ** clear bits in the pcxl resource map
299 pcxl_free_range(unsigned long vaddr, size_t size)
302 unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
303 unsigned int pages_mapped = size >> PAGE_SHIFT;
305 ASSERT(pages_mapped);
306 ASSERT((pages_mapped * PAGE_SIZE) < DMA_CHUNK_SIZE);
307 ASSERT(pages_mapped < (BITS_PER_LONG - PAGE_SHIFT));
310 mask >>= BITS_PER_LONG - pages_mapped;
312 DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
313 res_idx, size, pages_mapped, mask);
315 spin_lock_irqsave(&pcxl_res_lock, flags);
317 if(pages_mapped <= 8) {
318 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
319 } else if(pages_mapped <= 16) {
320 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
321 } else if(pages_mapped <= 32) {
322 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
324 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
328 pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
329 pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
331 spin_unlock_irqrestore(&pcxl_res_lock, flags);
339 if (pcxl_dma_start == 0)
342 spin_lock_init(&pcxl_res_lock);
343 pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
345 pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
346 get_order(pcxl_res_size));
347 memset(pcxl_res_map, 0, pcxl_res_size);
348 proc_gsc_root = proc_mkdir("gsc", 0);
349 create_proc_info_entry("dino", 0, proc_gsc_root, pcxl_proc_info);
353 __initcall(pcxl_dma_init);
355 static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, int flag)
361 order = get_order(size);
362 size = 1 << (order + PAGE_SHIFT);
363 vaddr = pcxl_alloc_range(size);
364 paddr = __get_free_pages(flag, order);
365 flush_kernel_dcache_range(paddr, size);
367 map_uncached_pages(vaddr, size, paddr);
368 *dma_handle = (dma_addr_t) paddr;
371 /* This probably isn't needed to support EISA cards.
372 ** ISA cards will certainly only support 24-bit DMA addressing.
373 ** Not clear if we can, want, or need to support ISA.
375 if (!dev || *dev->coherent_dma_mask < 0xffffffff)
378 return (void *)vaddr;
381 static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
385 order = get_order(size);
386 size = 1 << (order + PAGE_SHIFT);
387 unmap_uncached_pages((unsigned long)vaddr, size);
388 pcxl_free_range((unsigned long)vaddr, size);
389 free_pages((unsigned long)__va(dma_handle), order);
392 static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction)
394 if (direction == DMA_NONE) {
395 printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
399 flush_kernel_dcache_range((unsigned long) addr, size);
400 return virt_to_phys(addr);
403 static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
405 if (direction == DMA_NONE) {
406 printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
410 if (direction == DMA_TO_DEVICE)
414 * For PCI_DMA_FROMDEVICE this flush is not necessary for the
415 * simple map/unmap case. However, it IS necessary if if
416 * pci_dma_sync_single_* has been called and the buffer reused.
419 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
423 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
427 if (direction == DMA_NONE)
430 for (i = 0; i < nents; i++, sglist++ ) {
431 unsigned long vaddr = sg_virt_addr(sglist);
432 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
433 sg_dma_len(sglist) = sglist->length;
434 flush_kernel_dcache_range(vaddr, sglist->length);
439 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
443 if (direction == DMA_NONE)
446 if (direction == DMA_TO_DEVICE)
449 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
451 for (i = 0; i < nents; i++, sglist++ )
452 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
456 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)
458 if (direction == DMA_NONE)
461 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
464 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)
466 if (direction == DMA_NONE)
469 flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
472 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
476 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
478 for (i = 0; i < nents; i++, sglist++ )
479 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
482 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
486 /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
488 for (i = 0; i < nents; i++, sglist++ )
489 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
492 struct hppa_dma_ops pcxl_dma_ops = {
493 .dma_supported = pa11_dma_supported,
494 .alloc_consistent = pa11_dma_alloc_consistent,
495 .alloc_noncoherent = pa11_dma_alloc_consistent,
496 .free_consistent = pa11_dma_free_consistent,
497 .map_single = pa11_dma_map_single,
498 .unmap_single = pa11_dma_unmap_single,
499 .map_sg = pa11_dma_map_sg,
500 .unmap_sg = pa11_dma_unmap_sg,
501 .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
502 .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
503 .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
504 .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
507 static void *fail_alloc_consistent(struct device *dev, size_t size,
508 dma_addr_t *dma_handle, int flag)
513 static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
514 dma_addr_t *dma_handle, int flag)
518 /* rely on kmalloc to be cacheline aligned */
519 addr = kmalloc(size, flag);
521 *dma_handle = (dma_addr_t)virt_to_phys(addr);
526 static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
527 void *vaddr, dma_addr_t iova)
533 struct hppa_dma_ops pcx_dma_ops = {
534 .dma_supported = pa11_dma_supported,
535 .alloc_consistent = fail_alloc_consistent,
536 .alloc_noncoherent = pa11_dma_alloc_noncoherent,
537 .free_consistent = pa11_dma_free_noncoherent,
538 .map_single = pa11_dma_map_single,
539 .unmap_single = pa11_dma_unmap_single,
540 .map_sg = pa11_dma_map_sg,
541 .unmap_sg = pa11_dma_unmap_sg,
542 .dma_sync_single_cpu = pa11_dma_sync_single_cpu,
543 .dma_sync_single_device = pa11_dma_sync_single_device,
544 .dma_sync_sg_cpu = pa11_dma_sync_sg_cpu,
545 .dma_sync_sg_device = pa11_dma_sync_sg_device,
549 static int pcxl_proc_info(char *buf, char **start, off_t offset, int len)
552 unsigned long *res_ptr = (u_long *)pcxl_res_map;
553 unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
555 sprintf(buf, "\nDMA Mapping Area size : %d bytes (%d pages)\n",
557 (pcxl_res_size << 3) ); /* 1 bit per page */
559 sprintf(buf, "%sResource bitmap : %d bytes (%d pages)\n",
560 buf, pcxl_res_size, pcxl_res_size << 3); /* 8 bits per byte */
562 strcat(buf, " total: free: used: % used:\n");
563 sprintf(buf, "%sblocks %8d %8ld %8ld %8ld%%\n", buf, pcxl_res_size,
564 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
565 (pcxl_used_bytes * 100) / pcxl_res_size);
567 sprintf(buf, "%spages %8ld %8ld %8ld %8ld%%\n", buf, total_pages,
568 total_pages - pcxl_used_pages, pcxl_used_pages,
569 (pcxl_used_pages * 100 / total_pages));
571 strcat(buf, "\nResource bitmap:");
573 for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
576 sprintf(buf, "%s %08lx", buf, *res_ptr);