1 /* 2 * linux/arch/m68k/mm/sun3kmap.c 3 * 4 * Copyright (C) 2002 Sam Creasey <sammy@sammy.net> 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/vmalloc.h> 16 17 #include <asm/page.h> 18 #include <asm/io.h> 19 #include <asm/sun3mmu.h> 20 21 #include "../sun3/sun3.h" 22 23 #undef SUN3_KMAP_DEBUG 24 25 extern void mmu_emu_map_pmeg (int context, int vaddr); 26 27 static inline void do_page_mapin(unsigned long phys, unsigned long virt, 28 unsigned long type) 29 { 30 unsigned long pte; 31 pte_t ptep; 32 33 ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL); 34 pte = pte_val(ptep); 35 pte |= type; 36 37 sun3_put_pte(virt, pte); 38 39 #ifdef SUN3_KMAP_DEBUG 40 pr_info("mapin:"); 41 print_pte_vaddr(virt); 42 #endif 43 44 } 45 46 static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt, 47 unsigned long type, int pages) 48 { 49 50 if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG) 51 mmu_emu_map_pmeg(sun3_get_context(), virt); 52 53 while(pages) { 54 do_page_mapin(phys, virt, type); 55 phys += PAGE_SIZE; 56 virt += PAGE_SIZE; 57 pages--; 58 } 59 } 60 61 void __iomem *sun3_ioremap(unsigned long phys, unsigned long size, 62 unsigned long type) 63 { 64 struct vm_struct *area; 65 unsigned long offset, virt, ret; 66 int pages; 67 68 if(!size) 69 return NULL; 70 71 /* page align */ 72 offset = phys & (PAGE_SIZE-1); 73 phys &= ~(PAGE_SIZE-1); 74 75 size += offset; 76 size = PAGE_ALIGN(size); 77 if((area = get_vm_area(size, VM_IOREMAP)) == NULL) 78 return NULL; 79 80 #ifdef SUN3_KMAP_DEBUG 81 pr_info("ioremap: got virt %p size %lx(%lx)\n", area->addr, size, 82 area->size); 83 #endif 84 85 pages = size / PAGE_SIZE; 86 virt = (unsigned long)area->addr; 87 ret = virt + offset; 88 89 while(pages) { 90 int seg_pages; 91 92 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE; 93 if(seg_pages > pages) 94 seg_pages = pages; 95 96 do_pmeg_mapin(phys, virt, type, seg_pages); 97 98 pages -= seg_pages; 99 phys += seg_pages * PAGE_SIZE; 100 virt += seg_pages * PAGE_SIZE; 101 } 102 103 return (void __iomem *)ret; 104 105 } 106 EXPORT_SYMBOL(sun3_ioremap); 107 108 109 void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache) 110 { 111 112 return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO); 113 114 } 115 EXPORT_SYMBOL(__ioremap); 116 117 void iounmap(void __iomem *addr) 118 { 119 vfree((void *)(PAGE_MASK & (unsigned long)addr)); 120 } 121 EXPORT_SYMBOL(iounmap); 122 123 /* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val, 124 * trapping the potential read fault. Returns 0 if the access faulted, 125 * 1 on success. 126 * 127 * This function is primarily used to check addresses on the VME bus. 128 * 129 * Mucking with the page fault handler seems a little hackish to me, but 130 * SunOS, NetBSD, and Mach all implemented this check in such a manner, 131 * so I figure we're allowed. 132 */ 133 int sun3_map_test(unsigned long addr, char *val) 134 { 135 int ret = 0; 136 137 __asm__ __volatile__ 138 (".globl _sun3_map_test_start\n" 139 "_sun3_map_test_start:\n" 140 "1: moveb (%2), (%0)\n" 141 " moveq #1, %1\n" 142 "2:\n" 143 ".section .fixup,\"ax\"\n" 144 ".even\n" 145 "3: moveq #0, %1\n" 146 " jmp 2b\n" 147 ".previous\n" 148 ".section __ex_table,\"a\"\n" 149 ".align 4\n" 150 ".long 1b,3b\n" 151 ".previous\n" 152 ".globl _sun3_map_test_end\n" 153 "_sun3_map_test_end:\n" 154 : "=a"(val), "=r"(ret) 155 : "a"(addr)); 156 157 return ret; 158 } 159 EXPORT_SYMBOL(sun3_map_test); 160