11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds ** PARISC 1.1 Dynamic DMA mapping support. 31da177e4SLinus Torvalds ** This implementation is for PA-RISC platforms that do not support 41da177e4SLinus Torvalds ** I/O TLBs (aka DMA address translation hardware). 51da177e4SLinus Torvalds ** See Documentation/DMA-mapping.txt for interface definitions. 61da177e4SLinus Torvalds ** 71da177e4SLinus Torvalds ** (c) Copyright 1999,2000 Hewlett-Packard Company 81da177e4SLinus Torvalds ** (c) Copyright 2000 Grant Grundler 91da177e4SLinus Torvalds ** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org> 101da177e4SLinus Torvalds ** (c) Copyright 2000 John Marvin 111da177e4SLinus Torvalds ** 121da177e4SLinus Torvalds ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c. 131da177e4SLinus Torvalds ** (I assume it's from David Mosberger-Tang but there was no Copyright) 141da177e4SLinus Torvalds ** 151da177e4SLinus Torvalds ** AFAIK, all PA7100LC and PA7300LC platforms can use this code. 161da177e4SLinus Torvalds ** 171da177e4SLinus Torvalds ** - ggg 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #include <linux/init.h> 211da177e4SLinus Torvalds #include <linux/mm.h> 221da177e4SLinus Torvalds #include <linux/pci.h> 231da177e4SLinus Torvalds #include <linux/proc_fs.h> 241da177e4SLinus Torvalds #include <linux/slab.h> 251da177e4SLinus Torvalds #include <linux/string.h> 261da177e4SLinus Torvalds #include <linux/types.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include <asm/cacheflush.h> 291da177e4SLinus Torvalds #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ 301da177e4SLinus Torvalds #include <asm/io.h> 311da177e4SLinus Torvalds #include <asm/page.h> /* get_order */ 321da177e4SLinus Torvalds #include <asm/pgalloc.h> 331da177e4SLinus Torvalds #include <asm/uaccess.h> 34b8db8002SGrant Grundler #include <asm/tlbflush.h> /* for purge_tlb_*() macros */ 351da177e4SLinus Torvalds 368039de10SHelge Deller static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; 371da177e4SLinus Torvalds static int pcxl_proc_info(char *buffer, char **start, off_t offset, int length); 388039de10SHelge Deller static unsigned long pcxl_used_bytes __read_mostly = 0; 398039de10SHelge Deller static unsigned long pcxl_used_pages __read_mostly = 0; 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ 421da177e4SLinus Torvalds static spinlock_t pcxl_res_lock; 431da177e4SLinus Torvalds static char *pcxl_res_map; 441da177e4SLinus Torvalds static int pcxl_res_hint; 451da177e4SLinus Torvalds static int pcxl_res_size; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #ifdef DEBUG_PCXL_RESOURCE 481da177e4SLinus Torvalds #define DBG_RES(x...) printk(x) 491da177e4SLinus Torvalds #else 501da177e4SLinus Torvalds #define DBG_RES(x...) 511da177e4SLinus Torvalds #endif 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds /* 551da177e4SLinus Torvalds ** Dump a hex representation of the resource map. 561da177e4SLinus Torvalds */ 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds #ifdef DUMP_RESMAP 591da177e4SLinus Torvalds static 601da177e4SLinus Torvalds void dump_resmap(void) 611da177e4SLinus Torvalds { 621da177e4SLinus Torvalds u_long *res_ptr = (unsigned long *)pcxl_res_map; 631da177e4SLinus Torvalds u_long i = 0; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds printk("res_map: "); 661da177e4SLinus Torvalds for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr) 671da177e4SLinus Torvalds printk("%08lx ", *res_ptr); 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds printk("\n"); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds #else 721da177e4SLinus Torvalds static inline void dump_resmap(void) {;} 731da177e4SLinus Torvalds #endif 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static int pa11_dma_supported( struct device *dev, u64 mask) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds return 1; 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds static inline int map_pte_uncached(pte_t * pte, 811da177e4SLinus Torvalds unsigned long vaddr, 821da177e4SLinus Torvalds unsigned long size, unsigned long *paddr_ptr) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds unsigned long end; 851da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds vaddr &= ~PMD_MASK; 881da177e4SLinus Torvalds end = vaddr + size; 891da177e4SLinus Torvalds if (end > PMD_SIZE) 901da177e4SLinus Torvalds end = PMD_SIZE; 911da177e4SLinus Torvalds do { 921da177e4SLinus Torvalds if (!pte_none(*pte)) 931da177e4SLinus Torvalds printk(KERN_ERR "map_pte_uncached: page already exists\n"); 941da177e4SLinus Torvalds set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); 951da177e4SLinus Torvalds purge_tlb_start(); 961da177e4SLinus Torvalds pdtlb_kernel(orig_vaddr); 971da177e4SLinus Torvalds purge_tlb_end(); 981da177e4SLinus Torvalds vaddr += PAGE_SIZE; 991da177e4SLinus Torvalds orig_vaddr += PAGE_SIZE; 1001da177e4SLinus Torvalds (*paddr_ptr) += PAGE_SIZE; 1011da177e4SLinus Torvalds pte++; 1021da177e4SLinus Torvalds } while (vaddr < end); 1031da177e4SLinus Torvalds return 0; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr, 1071da177e4SLinus Torvalds unsigned long size, unsigned long *paddr_ptr) 1081da177e4SLinus Torvalds { 1091da177e4SLinus Torvalds unsigned long end; 1101da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds vaddr &= ~PGDIR_MASK; 1131da177e4SLinus Torvalds end = vaddr + size; 1141da177e4SLinus Torvalds if (end > PGDIR_SIZE) 1151da177e4SLinus Torvalds end = PGDIR_SIZE; 1161da177e4SLinus Torvalds do { 117872fec16SHugh Dickins pte_t * pte = pte_alloc_kernel(pmd, vaddr); 1181da177e4SLinus Torvalds if (!pte) 1191da177e4SLinus Torvalds return -ENOMEM; 1201da177e4SLinus Torvalds if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr)) 1211da177e4SLinus Torvalds return -ENOMEM; 1221da177e4SLinus Torvalds vaddr = (vaddr + PMD_SIZE) & PMD_MASK; 1231da177e4SLinus Torvalds orig_vaddr += PMD_SIZE; 1241da177e4SLinus Torvalds pmd++; 1251da177e4SLinus Torvalds } while (vaddr < end); 1261da177e4SLinus Torvalds return 0; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, 1301da177e4SLinus Torvalds unsigned long paddr) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds pgd_t * dir; 1331da177e4SLinus Torvalds unsigned long end = vaddr + size; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds dir = pgd_offset_k(vaddr); 1361da177e4SLinus Torvalds do { 1371da177e4SLinus Torvalds pmd_t *pmd; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds pmd = pmd_alloc(NULL, dir, vaddr); 1401da177e4SLinus Torvalds if (!pmd) 1411da177e4SLinus Torvalds return -ENOMEM; 1421da177e4SLinus Torvalds if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) 1431da177e4SLinus Torvalds return -ENOMEM; 1441da177e4SLinus Torvalds vaddr = vaddr + PGDIR_SIZE; 1451da177e4SLinus Torvalds dir++; 1461da177e4SLinus Torvalds } while (vaddr && (vaddr < end)); 1471da177e4SLinus Torvalds return 0; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, 1511da177e4SLinus Torvalds unsigned long size) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds pte_t * pte; 1541da177e4SLinus Torvalds unsigned long end; 1551da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds if (pmd_none(*pmd)) 1581da177e4SLinus Torvalds return; 1591da177e4SLinus Torvalds if (pmd_bad(*pmd)) { 1601da177e4SLinus Torvalds pmd_ERROR(*pmd); 1611da177e4SLinus Torvalds pmd_clear(pmd); 1621da177e4SLinus Torvalds return; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds pte = pte_offset_map(pmd, vaddr); 1651da177e4SLinus Torvalds vaddr &= ~PMD_MASK; 1661da177e4SLinus Torvalds end = vaddr + size; 1671da177e4SLinus Torvalds if (end > PMD_SIZE) 1681da177e4SLinus Torvalds end = PMD_SIZE; 1691da177e4SLinus Torvalds do { 1701da177e4SLinus Torvalds pte_t page = *pte; 1711da177e4SLinus Torvalds pte_clear(&init_mm, vaddr, pte); 1721da177e4SLinus Torvalds purge_tlb_start(); 1731da177e4SLinus Torvalds pdtlb_kernel(orig_vaddr); 1741da177e4SLinus Torvalds purge_tlb_end(); 1751da177e4SLinus Torvalds vaddr += PAGE_SIZE; 1761da177e4SLinus Torvalds orig_vaddr += PAGE_SIZE; 1771da177e4SLinus Torvalds pte++; 1781da177e4SLinus Torvalds if (pte_none(page) || pte_present(page)) 1791da177e4SLinus Torvalds continue; 1801da177e4SLinus Torvalds printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); 1811da177e4SLinus Torvalds } while (vaddr < end); 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, 1851da177e4SLinus Torvalds unsigned long size) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds pmd_t * pmd; 1881da177e4SLinus Torvalds unsigned long end; 1891da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds if (pgd_none(*dir)) 1921da177e4SLinus Torvalds return; 1931da177e4SLinus Torvalds if (pgd_bad(*dir)) { 1941da177e4SLinus Torvalds pgd_ERROR(*dir); 1951da177e4SLinus Torvalds pgd_clear(dir); 1961da177e4SLinus Torvalds return; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds pmd = pmd_offset(dir, vaddr); 1991da177e4SLinus Torvalds vaddr &= ~PGDIR_MASK; 2001da177e4SLinus Torvalds end = vaddr + size; 2011da177e4SLinus Torvalds if (end > PGDIR_SIZE) 2021da177e4SLinus Torvalds end = PGDIR_SIZE; 2031da177e4SLinus Torvalds do { 2041da177e4SLinus Torvalds unmap_uncached_pte(pmd, orig_vaddr, end - vaddr); 2051da177e4SLinus Torvalds vaddr = (vaddr + PMD_SIZE) & PMD_MASK; 2061da177e4SLinus Torvalds orig_vaddr += PMD_SIZE; 2071da177e4SLinus Torvalds pmd++; 2081da177e4SLinus Torvalds } while (vaddr < end); 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds pgd_t * dir; 2141da177e4SLinus Torvalds unsigned long end = vaddr + size; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds dir = pgd_offset_k(vaddr); 2171da177e4SLinus Torvalds do { 2181da177e4SLinus Torvalds unmap_uncached_pmd(dir, vaddr, end - vaddr); 2191da177e4SLinus Torvalds vaddr = vaddr + PGDIR_SIZE; 2201da177e4SLinus Torvalds dir++; 2211da177e4SLinus Torvalds } while (vaddr && (vaddr < end)); 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds #define PCXL_SEARCH_LOOP(idx, mask, size) \ 2251da177e4SLinus Torvalds for(; res_ptr < res_end; ++res_ptr) \ 2261da177e4SLinus Torvalds { \ 2271da177e4SLinus Torvalds if(0 == ((*res_ptr) & mask)) { \ 2281da177e4SLinus Torvalds *res_ptr |= mask; \ 2291da177e4SLinus Torvalds idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \ 2301da177e4SLinus Torvalds pcxl_res_hint = idx + (size >> 3); \ 2311da177e4SLinus Torvalds goto resource_found; \ 2321da177e4SLinus Torvalds } \ 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds #define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \ 2361da177e4SLinus Torvalds u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \ 2371da177e4SLinus Torvalds u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \ 2381da177e4SLinus Torvalds PCXL_SEARCH_LOOP(idx, mask, size); \ 2391da177e4SLinus Torvalds res_ptr = (u##size *)&pcxl_res_map[0]; \ 2401da177e4SLinus Torvalds PCXL_SEARCH_LOOP(idx, mask, size); \ 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds unsigned long 2441da177e4SLinus Torvalds pcxl_alloc_range(size_t size) 2451da177e4SLinus Torvalds { 2461da177e4SLinus Torvalds int res_idx; 2471da177e4SLinus Torvalds u_long mask, flags; 2481da177e4SLinus Torvalds unsigned int pages_needed = size >> PAGE_SHIFT; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds mask = (u_long) -1L; 2511da177e4SLinus Torvalds mask >>= BITS_PER_LONG - pages_needed; 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", 2541da177e4SLinus Torvalds size, pages_needed, mask); 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds spin_lock_irqsave(&pcxl_res_lock, flags); 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds if(pages_needed <= 8) { 2591da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 8); 2601da177e4SLinus Torvalds } else if(pages_needed <= 16) { 2611da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 16); 2621da177e4SLinus Torvalds } else if(pages_needed <= 32) { 2631da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 32); 2641da177e4SLinus Torvalds } else { 2651da177e4SLinus Torvalds panic("%s: pcxl_alloc_range() Too many pages to map.\n", 2661da177e4SLinus Torvalds __FILE__); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds dump_resmap(); 2701da177e4SLinus Torvalds panic("%s: pcxl_alloc_range() out of dma mapping resources\n", 2711da177e4SLinus Torvalds __FILE__); 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds resource_found: 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n", 2761da177e4SLinus Torvalds res_idx, mask, pcxl_res_hint); 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds pcxl_used_pages += pages_needed; 2791da177e4SLinus Torvalds pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1); 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds spin_unlock_irqrestore(&pcxl_res_lock, flags); 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds dump_resmap(); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* 2861da177e4SLinus Torvalds ** return the corresponding vaddr in the pcxl dma map 2871da177e4SLinus Torvalds */ 2881da177e4SLinus Torvalds return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3))); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds #define PCXL_FREE_MAPPINGS(idx, m, size) \ 2921da177e4SLinus Torvalds u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \ 2931da177e4SLinus Torvalds /* BUG_ON((*res_ptr & m) != m); */ \ 2941da177e4SLinus Torvalds *res_ptr &= ~m; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* 2971da177e4SLinus Torvalds ** clear bits in the pcxl resource map 2981da177e4SLinus Torvalds */ 2991da177e4SLinus Torvalds static void 3001da177e4SLinus Torvalds pcxl_free_range(unsigned long vaddr, size_t size) 3011da177e4SLinus Torvalds { 3021da177e4SLinus Torvalds u_long mask, flags; 3031da177e4SLinus Torvalds unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3); 3041da177e4SLinus Torvalds unsigned int pages_mapped = size >> PAGE_SHIFT; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds mask = (u_long) -1L; 3071da177e4SLinus Torvalds mask >>= BITS_PER_LONG - pages_mapped; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", 3101da177e4SLinus Torvalds res_idx, size, pages_mapped, mask); 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds spin_lock_irqsave(&pcxl_res_lock, flags); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds if(pages_mapped <= 8) { 3151da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 8); 3161da177e4SLinus Torvalds } else if(pages_mapped <= 16) { 3171da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 16); 3181da177e4SLinus Torvalds } else if(pages_mapped <= 32) { 3191da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 32); 3201da177e4SLinus Torvalds } else { 3211da177e4SLinus Torvalds panic("%s: pcxl_free_range() Too many pages to unmap.\n", 3221da177e4SLinus Torvalds __FILE__); 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds pcxl_used_pages -= (pages_mapped ? pages_mapped : 1); 3261da177e4SLinus Torvalds pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds spin_unlock_irqrestore(&pcxl_res_lock, flags); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds dump_resmap(); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds static int __init 3341da177e4SLinus Torvalds pcxl_dma_init(void) 3351da177e4SLinus Torvalds { 3361da177e4SLinus Torvalds if (pcxl_dma_start == 0) 3371da177e4SLinus Torvalds return 0; 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds spin_lock_init(&pcxl_res_lock); 3401da177e4SLinus Torvalds pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); 3411da177e4SLinus Torvalds pcxl_res_hint = 0; 3421da177e4SLinus Torvalds pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, 3431da177e4SLinus Torvalds get_order(pcxl_res_size)); 3441da177e4SLinus Torvalds memset(pcxl_res_map, 0, pcxl_res_size); 345e51ec241SMatthew Wilcox proc_gsc_root = proc_mkdir("gsc", NULL); 346b8db8002SGrant Grundler if (!proc_gsc_root) 347b8db8002SGrant Grundler printk(KERN_WARNING 348b8db8002SGrant Grundler "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); 349b8db8002SGrant Grundler else { 350b8db8002SGrant Grundler struct proc_dir_entry* ent; 351b8db8002SGrant Grundler ent = create_proc_info_entry("pcxl_dma", 0, 352b8db8002SGrant Grundler proc_gsc_root, pcxl_proc_info); 353b8db8002SGrant Grundler if (!ent) 354b8db8002SGrant Grundler printk(KERN_WARNING 355b8db8002SGrant Grundler "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); 356b8db8002SGrant Grundler } 3571da177e4SLinus Torvalds return 0; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds __initcall(pcxl_dma_init); 3611da177e4SLinus Torvalds 3625c1fb41fSAl Viro static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) 3631da177e4SLinus Torvalds { 3641da177e4SLinus Torvalds unsigned long vaddr; 3651da177e4SLinus Torvalds unsigned long paddr; 3661da177e4SLinus Torvalds int order; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds order = get_order(size); 3691da177e4SLinus Torvalds size = 1 << (order + PAGE_SHIFT); 3701da177e4SLinus Torvalds vaddr = pcxl_alloc_range(size); 3711da177e4SLinus Torvalds paddr = __get_free_pages(flag, order); 3721da177e4SLinus Torvalds flush_kernel_dcache_range(paddr, size); 3731da177e4SLinus Torvalds paddr = __pa(paddr); 3741da177e4SLinus Torvalds map_uncached_pages(vaddr, size, paddr); 3751da177e4SLinus Torvalds *dma_handle = (dma_addr_t) paddr; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds #if 0 3781da177e4SLinus Torvalds /* This probably isn't needed to support EISA cards. 3791da177e4SLinus Torvalds ** ISA cards will certainly only support 24-bit DMA addressing. 3801da177e4SLinus Torvalds ** Not clear if we can, want, or need to support ISA. 3811da177e4SLinus Torvalds */ 3821da177e4SLinus Torvalds if (!dev || *dev->coherent_dma_mask < 0xffffffff) 3831da177e4SLinus Torvalds gfp |= GFP_DMA; 3841da177e4SLinus Torvalds #endif 3851da177e4SLinus Torvalds return (void *)vaddr; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds int order; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds order = get_order(size); 3931da177e4SLinus Torvalds size = 1 << (order + PAGE_SHIFT); 3941da177e4SLinus Torvalds unmap_uncached_pages((unsigned long)vaddr, size); 3951da177e4SLinus Torvalds pcxl_free_range((unsigned long)vaddr, size); 3961da177e4SLinus Torvalds free_pages((unsigned long)__va(dma_handle), order); 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction) 4001da177e4SLinus Torvalds { 4011da177e4SLinus Torvalds if (direction == DMA_NONE) { 4021da177e4SLinus Torvalds printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0)); 4031da177e4SLinus Torvalds BUG(); 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds flush_kernel_dcache_range((unsigned long) addr, size); 4071da177e4SLinus Torvalds return virt_to_phys(addr); 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds if (direction == DMA_NONE) { 4131da177e4SLinus Torvalds printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0)); 4141da177e4SLinus Torvalds BUG(); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if (direction == DMA_TO_DEVICE) 4181da177e4SLinus Torvalds return; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* 4211da177e4SLinus Torvalds * For PCI_DMA_FROMDEVICE this flush is not necessary for the 4221da177e4SLinus Torvalds * simple map/unmap case. However, it IS necessary if if 4231da177e4SLinus Torvalds * pci_dma_sync_single_* has been called and the buffer reused. 4241da177e4SLinus Torvalds */ 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); 4271da177e4SLinus Torvalds return; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) 4311da177e4SLinus Torvalds { 4321da177e4SLinus Torvalds int i; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds if (direction == DMA_NONE) 4351da177e4SLinus Torvalds BUG(); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds for (i = 0; i < nents; i++, sglist++ ) { 4381da177e4SLinus Torvalds unsigned long vaddr = sg_virt_addr(sglist); 4391da177e4SLinus Torvalds sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); 4401da177e4SLinus Torvalds sg_dma_len(sglist) = sglist->length; 4411da177e4SLinus Torvalds flush_kernel_dcache_range(vaddr, sglist->length); 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds return nents; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds int i; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds if (direction == DMA_NONE) 4511da177e4SLinus Torvalds BUG(); 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds if (direction == DMA_TO_DEVICE) 4541da177e4SLinus Torvalds return; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds for (i = 0; i < nents; i++, sglist++ ) 4591da177e4SLinus Torvalds flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); 4601da177e4SLinus Torvalds return; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds 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) 4641da177e4SLinus Torvalds { 4651da177e4SLinus Torvalds if (direction == DMA_NONE) 4661da177e4SLinus Torvalds BUG(); 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds 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) 4721da177e4SLinus Torvalds { 4731da177e4SLinus Torvalds if (direction == DMA_NONE) 4741da177e4SLinus Torvalds BUG(); 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds int i; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds for (i = 0; i < nents; i++, sglist++ ) 4861da177e4SLinus Torvalds flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) 4901da177e4SLinus Torvalds { 4911da177e4SLinus Torvalds int i; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds for (i = 0; i < nents; i++, sglist++ ) 4961da177e4SLinus Torvalds flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds struct hppa_dma_ops pcxl_dma_ops = { 5001da177e4SLinus Torvalds .dma_supported = pa11_dma_supported, 5011da177e4SLinus Torvalds .alloc_consistent = pa11_dma_alloc_consistent, 5021da177e4SLinus Torvalds .alloc_noncoherent = pa11_dma_alloc_consistent, 5031da177e4SLinus Torvalds .free_consistent = pa11_dma_free_consistent, 5041da177e4SLinus Torvalds .map_single = pa11_dma_map_single, 5051da177e4SLinus Torvalds .unmap_single = pa11_dma_unmap_single, 5061da177e4SLinus Torvalds .map_sg = pa11_dma_map_sg, 5071da177e4SLinus Torvalds .unmap_sg = pa11_dma_unmap_sg, 5081da177e4SLinus Torvalds .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, 5091da177e4SLinus Torvalds .dma_sync_single_for_device = pa11_dma_sync_single_for_device, 5101da177e4SLinus Torvalds .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, 5111da177e4SLinus Torvalds .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, 5121da177e4SLinus Torvalds }; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds static void *fail_alloc_consistent(struct device *dev, size_t size, 5155c1fb41fSAl Viro dma_addr_t *dma_handle, gfp_t flag) 5161da177e4SLinus Torvalds { 5171da177e4SLinus Torvalds return NULL; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size, 5215c1fb41fSAl Viro dma_addr_t *dma_handle, gfp_t flag) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds void *addr = NULL; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* rely on kmalloc to be cacheline aligned */ 5261da177e4SLinus Torvalds addr = kmalloc(size, flag); 5271da177e4SLinus Torvalds if(addr) 5281da177e4SLinus Torvalds *dma_handle = (dma_addr_t)virt_to_phys(addr); 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds return addr; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds static void pa11_dma_free_noncoherent(struct device *dev, size_t size, 5341da177e4SLinus Torvalds void *vaddr, dma_addr_t iova) 5351da177e4SLinus Torvalds { 5361da177e4SLinus Torvalds kfree(vaddr); 5371da177e4SLinus Torvalds return; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds struct hppa_dma_ops pcx_dma_ops = { 5411da177e4SLinus Torvalds .dma_supported = pa11_dma_supported, 5421da177e4SLinus Torvalds .alloc_consistent = fail_alloc_consistent, 5431da177e4SLinus Torvalds .alloc_noncoherent = pa11_dma_alloc_noncoherent, 5441da177e4SLinus Torvalds .free_consistent = pa11_dma_free_noncoherent, 5451da177e4SLinus Torvalds .map_single = pa11_dma_map_single, 5461da177e4SLinus Torvalds .unmap_single = pa11_dma_unmap_single, 5471da177e4SLinus Torvalds .map_sg = pa11_dma_map_sg, 5481da177e4SLinus Torvalds .unmap_sg = pa11_dma_unmap_sg, 5491da177e4SLinus Torvalds .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, 5501da177e4SLinus Torvalds .dma_sync_single_for_device = pa11_dma_sync_single_for_device, 5511da177e4SLinus Torvalds .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, 5521da177e4SLinus Torvalds .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, 5531da177e4SLinus Torvalds }; 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds static int pcxl_proc_info(char *buf, char **start, off_t offset, int len) 5571da177e4SLinus Torvalds { 558b8db8002SGrant Grundler #if 0 5591da177e4SLinus Torvalds u_long i = 0; 5601da177e4SLinus Torvalds unsigned long *res_ptr = (u_long *)pcxl_res_map; 561b8db8002SGrant Grundler #endif 5621da177e4SLinus Torvalds unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */ 5631da177e4SLinus Torvalds 564b8db8002SGrant Grundler sprintf(buf, "\nDMA Mapping Area size : %d bytes (%ld pages)\n", 565b8db8002SGrant Grundler PCXL_DMA_MAP_SIZE, total_pages); 5661da177e4SLinus Torvalds 567b8db8002SGrant Grundler sprintf(buf, "%sResource bitmap : %d bytes\n", buf, pcxl_res_size); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds strcat(buf, " total: free: used: % used:\n"); 5701da177e4SLinus Torvalds sprintf(buf, "%sblocks %8d %8ld %8ld %8ld%%\n", buf, pcxl_res_size, 5711da177e4SLinus Torvalds pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes, 5721da177e4SLinus Torvalds (pcxl_used_bytes * 100) / pcxl_res_size); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds sprintf(buf, "%spages %8ld %8ld %8ld %8ld%%\n", buf, total_pages, 5751da177e4SLinus Torvalds total_pages - pcxl_used_pages, pcxl_used_pages, 5761da177e4SLinus Torvalds (pcxl_used_pages * 100 / total_pages)); 5771da177e4SLinus Torvalds 578b8db8002SGrant Grundler #if 0 5791da177e4SLinus Torvalds strcat(buf, "\nResource bitmap:"); 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) { 5821da177e4SLinus Torvalds if ((i & 7) == 0) 5831da177e4SLinus Torvalds strcat(buf,"\n "); 5841da177e4SLinus Torvalds sprintf(buf, "%s %08lx", buf, *res_ptr); 5851da177e4SLinus Torvalds } 586b8db8002SGrant Grundler #endif 5871da177e4SLinus Torvalds strcat(buf, "\n"); 5881da177e4SLinus Torvalds return strlen(buf); 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 591