1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds ** PARISC 1.1 Dynamic DMA mapping support. 41da177e4SLinus Torvalds ** This implementation is for PA-RISC platforms that do not support 51da177e4SLinus Torvalds ** I/O TLBs (aka DMA address translation hardware). 6985098a0SMauro Carvalho Chehab ** See Documentation/core-api/dma-api-howto.rst for interface definitions. 71da177e4SLinus Torvalds ** 81da177e4SLinus Torvalds ** (c) Copyright 1999,2000 Hewlett-Packard Company 91da177e4SLinus Torvalds ** (c) Copyright 2000 Grant Grundler 101da177e4SLinus Torvalds ** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org> 111da177e4SLinus Torvalds ** (c) Copyright 2000 John Marvin 121da177e4SLinus Torvalds ** 131da177e4SLinus Torvalds ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c. 141da177e4SLinus Torvalds ** (I assume it's from David Mosberger-Tang but there was no Copyright) 151da177e4SLinus Torvalds ** 161da177e4SLinus Torvalds ** AFAIK, all PA7100LC and PA7300LC platforms can use this code. 171da177e4SLinus Torvalds ** 181da177e4SLinus Torvalds ** - ggg 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <linux/init.h> 225a0e3ad6STejun Heo #include <linux/gfp.h> 231da177e4SLinus Torvalds #include <linux/mm.h> 241da177e4SLinus Torvalds #include <linux/proc_fs.h> 2527f282b9SAlexey Dobriyan #include <linux/seq_file.h> 261da177e4SLinus Torvalds #include <linux/string.h> 271da177e4SLinus Torvalds #include <linux/types.h> 28c1f59375SChristoph Hellwig #include <linux/dma-direct.h> 29c1f59375SChristoph Hellwig #include <linux/dma-noncoherent.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/cacheflush.h> 321da177e4SLinus Torvalds #include <asm/dma.h> /* for DMA_CHUNK_SIZE */ 331da177e4SLinus Torvalds #include <asm/io.h> 341da177e4SLinus Torvalds #include <asm/page.h> /* get_order */ 351da177e4SLinus Torvalds #include <asm/pgalloc.h> 367c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 37b8db8002SGrant Grundler #include <asm/tlbflush.h> /* for purge_tlb_*() macros */ 381da177e4SLinus Torvalds 398039de10SHelge Deller static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; 408039de10SHelge Deller static unsigned long pcxl_used_bytes __read_mostly = 0; 418039de10SHelge Deller static unsigned long pcxl_used_pages __read_mostly = 0; 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ 448b5bdd85SHelge Deller static DEFINE_SPINLOCK(pcxl_res_lock); 451da177e4SLinus Torvalds static char *pcxl_res_map; 461da177e4SLinus Torvalds static int pcxl_res_hint; 471da177e4SLinus Torvalds static int pcxl_res_size; 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #ifdef DEBUG_PCXL_RESOURCE 501da177e4SLinus Torvalds #define DBG_RES(x...) printk(x) 511da177e4SLinus Torvalds #else 521da177e4SLinus Torvalds #define DBG_RES(x...) 531da177e4SLinus Torvalds #endif 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds /* 571da177e4SLinus Torvalds ** Dump a hex representation of the resource map. 581da177e4SLinus Torvalds */ 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #ifdef DUMP_RESMAP 611da177e4SLinus Torvalds static 621da177e4SLinus Torvalds void dump_resmap(void) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds u_long *res_ptr = (unsigned long *)pcxl_res_map; 651da177e4SLinus Torvalds u_long i = 0; 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds printk("res_map: "); 681da177e4SLinus Torvalds for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr) 691da177e4SLinus Torvalds printk("%08lx ", *res_ptr); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds printk("\n"); 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds #else 741da177e4SLinus Torvalds static inline void dump_resmap(void) {;} 751da177e4SLinus Torvalds #endif 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds static inline int map_pte_uncached(pte_t * pte, 781da177e4SLinus Torvalds unsigned long vaddr, 791da177e4SLinus Torvalds unsigned long size, unsigned long *paddr_ptr) 801da177e4SLinus Torvalds { 811da177e4SLinus Torvalds unsigned long end; 821da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds vaddr &= ~PMD_MASK; 851da177e4SLinus Torvalds end = vaddr + size; 861da177e4SLinus Torvalds if (end > PMD_SIZE) 871da177e4SLinus Torvalds end = PMD_SIZE; 881da177e4SLinus Torvalds do { 89e82a3b75SHelge Deller unsigned long flags; 90e82a3b75SHelge Deller 911da177e4SLinus Torvalds if (!pte_none(*pte)) 921da177e4SLinus Torvalds printk(KERN_ERR "map_pte_uncached: page already exists\n"); 93e82a3b75SHelge Deller purge_tlb_start(flags); 94c0452fb9SJohn David Anglin set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); 951da177e4SLinus Torvalds pdtlb_kernel(orig_vaddr); 96e82a3b75SHelge Deller purge_tlb_end(flags); 971da177e4SLinus Torvalds vaddr += PAGE_SIZE; 981da177e4SLinus Torvalds orig_vaddr += PAGE_SIZE; 991da177e4SLinus Torvalds (*paddr_ptr) += PAGE_SIZE; 1001da177e4SLinus Torvalds pte++; 1011da177e4SLinus Torvalds } while (vaddr < end); 1021da177e4SLinus Torvalds return 0; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr, 1061da177e4SLinus Torvalds unsigned long size, unsigned long *paddr_ptr) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds unsigned long end; 1091da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds vaddr &= ~PGDIR_MASK; 1121da177e4SLinus Torvalds end = vaddr + size; 1131da177e4SLinus Torvalds if (end > PGDIR_SIZE) 1141da177e4SLinus Torvalds end = PGDIR_SIZE; 1151da177e4SLinus Torvalds do { 116872fec16SHugh Dickins pte_t * pte = pte_alloc_kernel(pmd, vaddr); 1171da177e4SLinus Torvalds if (!pte) 1181da177e4SLinus Torvalds return -ENOMEM; 1191da177e4SLinus Torvalds if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr)) 1201da177e4SLinus Torvalds return -ENOMEM; 1211da177e4SLinus Torvalds vaddr = (vaddr + PMD_SIZE) & PMD_MASK; 1221da177e4SLinus Torvalds orig_vaddr += PMD_SIZE; 1231da177e4SLinus Torvalds pmd++; 1241da177e4SLinus Torvalds } while (vaddr < end); 1251da177e4SLinus Torvalds return 0; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, 1291da177e4SLinus Torvalds unsigned long paddr) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds pgd_t * dir; 1321da177e4SLinus Torvalds unsigned long end = vaddr + size; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds dir = pgd_offset_k(vaddr); 1351da177e4SLinus Torvalds do { 136d96885e2SMike Rapoport p4d_t *p4d; 137d96885e2SMike Rapoport pud_t *pud; 1381da177e4SLinus Torvalds pmd_t *pmd; 1391da177e4SLinus Torvalds 140d96885e2SMike Rapoport p4d = p4d_offset(dir, vaddr); 141d96885e2SMike Rapoport pud = pud_offset(p4d, vaddr); 142d96885e2SMike Rapoport pmd = pmd_alloc(NULL, pud, vaddr); 143d96885e2SMike Rapoport 1441da177e4SLinus Torvalds if (!pmd) 1451da177e4SLinus Torvalds return -ENOMEM; 1461da177e4SLinus Torvalds if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) 1471da177e4SLinus Torvalds return -ENOMEM; 1481da177e4SLinus Torvalds vaddr = vaddr + PGDIR_SIZE; 1491da177e4SLinus Torvalds dir++; 1501da177e4SLinus Torvalds } while (vaddr && (vaddr < end)); 1511da177e4SLinus Torvalds return 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, 1551da177e4SLinus Torvalds unsigned long size) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds pte_t * pte; 1581da177e4SLinus Torvalds unsigned long end; 1591da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds if (pmd_none(*pmd)) 1621da177e4SLinus Torvalds return; 1631da177e4SLinus Torvalds if (pmd_bad(*pmd)) { 1641da177e4SLinus Torvalds pmd_ERROR(*pmd); 1651da177e4SLinus Torvalds pmd_clear(pmd); 1661da177e4SLinus Torvalds return; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds pte = pte_offset_map(pmd, vaddr); 1691da177e4SLinus Torvalds vaddr &= ~PMD_MASK; 1701da177e4SLinus Torvalds end = vaddr + size; 1711da177e4SLinus Torvalds if (end > PMD_SIZE) 1721da177e4SLinus Torvalds end = PMD_SIZE; 1731da177e4SLinus Torvalds do { 174e82a3b75SHelge Deller unsigned long flags; 1751da177e4SLinus Torvalds pte_t page = *pte; 176e82a3b75SHelge Deller 1771da177e4SLinus Torvalds pte_clear(&init_mm, vaddr, pte); 178e82a3b75SHelge Deller purge_tlb_start(flags); 1791da177e4SLinus Torvalds pdtlb_kernel(orig_vaddr); 180e82a3b75SHelge Deller purge_tlb_end(flags); 1811da177e4SLinus Torvalds vaddr += PAGE_SIZE; 1821da177e4SLinus Torvalds orig_vaddr += PAGE_SIZE; 1831da177e4SLinus Torvalds pte++; 1841da177e4SLinus Torvalds if (pte_none(page) || pte_present(page)) 1851da177e4SLinus Torvalds continue; 1861da177e4SLinus Torvalds printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); 1871da177e4SLinus Torvalds } while (vaddr < end); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, 1911da177e4SLinus Torvalds unsigned long size) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds pmd_t * pmd; 1941da177e4SLinus Torvalds unsigned long end; 1951da177e4SLinus Torvalds unsigned long orig_vaddr = vaddr; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds if (pgd_none(*dir)) 1981da177e4SLinus Torvalds return; 1991da177e4SLinus Torvalds if (pgd_bad(*dir)) { 2001da177e4SLinus Torvalds pgd_ERROR(*dir); 2011da177e4SLinus Torvalds pgd_clear(dir); 2021da177e4SLinus Torvalds return; 2031da177e4SLinus Torvalds } 204974b9b2cSMike Rapoport pmd = pmd_offset(pud_offset(p4d_offset(dir, vaddr), vaddr), vaddr); 2051da177e4SLinus Torvalds vaddr &= ~PGDIR_MASK; 2061da177e4SLinus Torvalds end = vaddr + size; 2071da177e4SLinus Torvalds if (end > PGDIR_SIZE) 2081da177e4SLinus Torvalds end = PGDIR_SIZE; 2091da177e4SLinus Torvalds do { 2101da177e4SLinus Torvalds unmap_uncached_pte(pmd, orig_vaddr, end - vaddr); 2111da177e4SLinus Torvalds vaddr = (vaddr + PMD_SIZE) & PMD_MASK; 2121da177e4SLinus Torvalds orig_vaddr += PMD_SIZE; 2131da177e4SLinus Torvalds pmd++; 2141da177e4SLinus Torvalds } while (vaddr < end); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds pgd_t * dir; 2201da177e4SLinus Torvalds unsigned long end = vaddr + size; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds dir = pgd_offset_k(vaddr); 2231da177e4SLinus Torvalds do { 2241da177e4SLinus Torvalds unmap_uncached_pmd(dir, vaddr, end - vaddr); 2251da177e4SLinus Torvalds vaddr = vaddr + PGDIR_SIZE; 2261da177e4SLinus Torvalds dir++; 2271da177e4SLinus Torvalds } while (vaddr && (vaddr < end)); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds #define PCXL_SEARCH_LOOP(idx, mask, size) \ 2311da177e4SLinus Torvalds for(; res_ptr < res_end; ++res_ptr) \ 2321da177e4SLinus Torvalds { \ 2331da177e4SLinus Torvalds if(0 == ((*res_ptr) & mask)) { \ 2341da177e4SLinus Torvalds *res_ptr |= mask; \ 2351da177e4SLinus Torvalds idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \ 2361da177e4SLinus Torvalds pcxl_res_hint = idx + (size >> 3); \ 2371da177e4SLinus Torvalds goto resource_found; \ 2381da177e4SLinus Torvalds } \ 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds #define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \ 2421da177e4SLinus Torvalds u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \ 2431da177e4SLinus Torvalds u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \ 2441da177e4SLinus Torvalds PCXL_SEARCH_LOOP(idx, mask, size); \ 2451da177e4SLinus Torvalds res_ptr = (u##size *)&pcxl_res_map[0]; \ 2461da177e4SLinus Torvalds PCXL_SEARCH_LOOP(idx, mask, size); \ 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds unsigned long 2501da177e4SLinus Torvalds pcxl_alloc_range(size_t size) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds int res_idx; 2531da177e4SLinus Torvalds u_long mask, flags; 2541da177e4SLinus Torvalds unsigned int pages_needed = size >> PAGE_SHIFT; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds mask = (u_long) -1L; 2571da177e4SLinus Torvalds mask >>= BITS_PER_LONG - pages_needed; 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", 2601da177e4SLinus Torvalds size, pages_needed, mask); 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds spin_lock_irqsave(&pcxl_res_lock, flags); 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds if(pages_needed <= 8) { 2651da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 8); 2661da177e4SLinus Torvalds } else if(pages_needed <= 16) { 2671da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 16); 2681da177e4SLinus Torvalds } else if(pages_needed <= 32) { 2691da177e4SLinus Torvalds PCXL_FIND_FREE_MAPPING(res_idx, mask, 32); 2701da177e4SLinus Torvalds } else { 2711da177e4SLinus Torvalds panic("%s: pcxl_alloc_range() Too many pages to map.\n", 2721da177e4SLinus Torvalds __FILE__); 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds dump_resmap(); 2761da177e4SLinus Torvalds panic("%s: pcxl_alloc_range() out of dma mapping resources\n", 2771da177e4SLinus Torvalds __FILE__); 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds resource_found: 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n", 2821da177e4SLinus Torvalds res_idx, mask, pcxl_res_hint); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds pcxl_used_pages += pages_needed; 2851da177e4SLinus Torvalds pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds spin_unlock_irqrestore(&pcxl_res_lock, flags); 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds dump_resmap(); 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 2921da177e4SLinus Torvalds ** return the corresponding vaddr in the pcxl dma map 2931da177e4SLinus Torvalds */ 2941da177e4SLinus Torvalds return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3))); 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds #define PCXL_FREE_MAPPINGS(idx, m, size) \ 2981da177e4SLinus Torvalds u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \ 2991da177e4SLinus Torvalds /* BUG_ON((*res_ptr & m) != m); */ \ 3001da177e4SLinus Torvalds *res_ptr &= ~m; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds /* 3031da177e4SLinus Torvalds ** clear bits in the pcxl resource map 3041da177e4SLinus Torvalds */ 3051da177e4SLinus Torvalds static void 3061da177e4SLinus Torvalds pcxl_free_range(unsigned long vaddr, size_t size) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds u_long mask, flags; 3091da177e4SLinus Torvalds unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3); 3101da177e4SLinus Torvalds unsigned int pages_mapped = size >> PAGE_SHIFT; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds mask = (u_long) -1L; 3131da177e4SLinus Torvalds mask >>= BITS_PER_LONG - pages_mapped; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", 3161da177e4SLinus Torvalds res_idx, size, pages_mapped, mask); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds spin_lock_irqsave(&pcxl_res_lock, flags); 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds if(pages_mapped <= 8) { 3211da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 8); 3221da177e4SLinus Torvalds } else if(pages_mapped <= 16) { 3231da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 16); 3241da177e4SLinus Torvalds } else if(pages_mapped <= 32) { 3251da177e4SLinus Torvalds PCXL_FREE_MAPPINGS(res_idx, mask, 32); 3261da177e4SLinus Torvalds } else { 3271da177e4SLinus Torvalds panic("%s: pcxl_free_range() Too many pages to unmap.\n", 3281da177e4SLinus Torvalds __FILE__); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds pcxl_used_pages -= (pages_mapped ? pages_mapped : 1); 3321da177e4SLinus Torvalds pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1); 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds spin_unlock_irqrestore(&pcxl_res_lock, flags); 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds dump_resmap(); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 33927f282b9SAlexey Dobriyan static int proc_pcxl_dma_show(struct seq_file *m, void *v) 34027f282b9SAlexey Dobriyan { 34127f282b9SAlexey Dobriyan #if 0 34227f282b9SAlexey Dobriyan u_long i = 0; 34327f282b9SAlexey Dobriyan unsigned long *res_ptr = (u_long *)pcxl_res_map; 34427f282b9SAlexey Dobriyan #endif 34527f282b9SAlexey Dobriyan unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */ 34627f282b9SAlexey Dobriyan 34727f282b9SAlexey Dobriyan seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n", 34827f282b9SAlexey Dobriyan PCXL_DMA_MAP_SIZE, total_pages); 34927f282b9SAlexey Dobriyan 35027f282b9SAlexey Dobriyan seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size); 35127f282b9SAlexey Dobriyan 35227f282b9SAlexey Dobriyan seq_puts(m, " total: free: used: % used:\n"); 35327f282b9SAlexey Dobriyan seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size, 35427f282b9SAlexey Dobriyan pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes, 35527f282b9SAlexey Dobriyan (pcxl_used_bytes * 100) / pcxl_res_size); 35627f282b9SAlexey Dobriyan 35727f282b9SAlexey Dobriyan seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages, 35827f282b9SAlexey Dobriyan total_pages - pcxl_used_pages, pcxl_used_pages, 35927f282b9SAlexey Dobriyan (pcxl_used_pages * 100 / total_pages)); 36027f282b9SAlexey Dobriyan 36127f282b9SAlexey Dobriyan #if 0 36227f282b9SAlexey Dobriyan seq_puts(m, "\nResource bitmap:"); 36327f282b9SAlexey Dobriyan 36427f282b9SAlexey Dobriyan for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) { 36527f282b9SAlexey Dobriyan if ((i & 7) == 0) 36627f282b9SAlexey Dobriyan seq_puts(m,"\n "); 36727f282b9SAlexey Dobriyan seq_printf(m, "%s %08lx", buf, *res_ptr); 36827f282b9SAlexey Dobriyan } 36927f282b9SAlexey Dobriyan #endif 37027f282b9SAlexey Dobriyan seq_putc(m, '\n'); 37127f282b9SAlexey Dobriyan return 0; 37227f282b9SAlexey Dobriyan } 37327f282b9SAlexey Dobriyan 3741da177e4SLinus Torvalds static int __init 3751da177e4SLinus Torvalds pcxl_dma_init(void) 3761da177e4SLinus Torvalds { 3771da177e4SLinus Torvalds if (pcxl_dma_start == 0) 3781da177e4SLinus Torvalds return 0; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); 3811da177e4SLinus Torvalds pcxl_res_hint = 0; 3821da177e4SLinus Torvalds pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, 3831da177e4SLinus Torvalds get_order(pcxl_res_size)); 3841da177e4SLinus Torvalds memset(pcxl_res_map, 0, pcxl_res_size); 385e51ec241SMatthew Wilcox proc_gsc_root = proc_mkdir("gsc", NULL); 386b8db8002SGrant Grundler if (!proc_gsc_root) 387b8db8002SGrant Grundler printk(KERN_WARNING 388b8db8002SGrant Grundler "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); 389b8db8002SGrant Grundler else { 390b8db8002SGrant Grundler struct proc_dir_entry* ent; 3913f3942acSChristoph Hellwig ent = proc_create_single("pcxl_dma", 0, proc_gsc_root, 3923f3942acSChristoph Hellwig proc_pcxl_dma_show); 3936f1c86ecSDenis V. Lunev if (!ent) 394b8db8002SGrant Grundler printk(KERN_WARNING 395b8db8002SGrant Grundler "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); 396b8db8002SGrant Grundler } 3971da177e4SLinus Torvalds return 0; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds __initcall(pcxl_dma_init); 4011da177e4SLinus Torvalds 402c2f2124eSChristoph Hellwig void *arch_dma_alloc(struct device *dev, size_t size, 403c2f2124eSChristoph Hellwig dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) 4041da177e4SLinus Torvalds { 4051da177e4SLinus Torvalds unsigned long vaddr; 4061da177e4SLinus Torvalds unsigned long paddr; 4071da177e4SLinus Torvalds int order; 4081da177e4SLinus Torvalds 409c2f2124eSChristoph Hellwig if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl) 410c2f2124eSChristoph Hellwig return NULL; 411c2f2124eSChristoph Hellwig 4121da177e4SLinus Torvalds order = get_order(size); 4131da177e4SLinus Torvalds size = 1 << (order + PAGE_SHIFT); 4141da177e4SLinus Torvalds vaddr = pcxl_alloc_range(size); 415c2f2124eSChristoph Hellwig paddr = __get_free_pages(gfp | __GFP_ZERO, order); 4161da177e4SLinus Torvalds flush_kernel_dcache_range(paddr, size); 4171da177e4SLinus Torvalds paddr = __pa(paddr); 4181da177e4SLinus Torvalds map_uncached_pages(vaddr, size, paddr); 4191da177e4SLinus Torvalds *dma_handle = (dma_addr_t) paddr; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds #if 0 4221da177e4SLinus Torvalds /* This probably isn't needed to support EISA cards. 4231da177e4SLinus Torvalds ** ISA cards will certainly only support 24-bit DMA addressing. 4241da177e4SLinus Torvalds ** Not clear if we can, want, or need to support ISA. 4251da177e4SLinus Torvalds */ 4261da177e4SLinus Torvalds if (!dev || *dev->coherent_dma_mask < 0xffffffff) 4271da177e4SLinus Torvalds gfp |= GFP_DMA; 4281da177e4SLinus Torvalds #endif 4291da177e4SLinus Torvalds return (void *)vaddr; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 432c1f59375SChristoph Hellwig void arch_dma_free(struct device *dev, size_t size, void *vaddr, 43300085f1eSKrzysztof Kozlowski dma_addr_t dma_handle, unsigned long attrs) 4341da177e4SLinus Torvalds { 435a34a9b96SChristoph Hellwig int order = get_order(size); 4361da177e4SLinus Torvalds 437c2f2124eSChristoph Hellwig WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 && 438c2f2124eSChristoph Hellwig boot_cpu_data.cpu_type != pcxl); 439c2f2124eSChristoph Hellwig 4401da177e4SLinus Torvalds size = 1 << (order + PAGE_SHIFT); 4411da177e4SLinus Torvalds unmap_uncached_pages((unsigned long)vaddr, size); 4421da177e4SLinus Torvalds pcxl_free_range((unsigned long)vaddr, size); 443a34a9b96SChristoph Hellwig 444c2f2124eSChristoph Hellwig free_pages((unsigned long)__va(dma_handle), order); 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 44756e35f9cSChristoph Hellwig void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 44856e35f9cSChristoph Hellwig enum dma_data_direction dir) 4491da177e4SLinus Torvalds { 450c1f59375SChristoph Hellwig flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 45356e35f9cSChristoph Hellwig void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, 45456e35f9cSChristoph Hellwig enum dma_data_direction dir) 4551da177e4SLinus Torvalds { 456c1f59375SChristoph Hellwig flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size); 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 459c1f59375SChristoph Hellwig void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size, 460c9eb6172SChristoph Hellwig enum dma_data_direction direction) 461c9eb6172SChristoph Hellwig { 462c9eb6172SChristoph Hellwig flush_kernel_dcache_range((unsigned long)vaddr, size); 463c9eb6172SChristoph Hellwig } 464