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/pgtable.h>
19 #include <asm/io.h>
20 #include <asm/sun3mmu.h>
21
22 #undef SUN3_KMAP_DEBUG
23
24 #ifdef SUN3_KMAP_DEBUG
25 extern void print_pte_vaddr(unsigned long vaddr);
26 #endif
27
28 extern void mmu_emu_map_pmeg (int context, int vaddr);
29
do_page_mapin(unsigned long phys,unsigned long virt,unsigned long type)30 static inline void do_page_mapin(unsigned long phys, unsigned long virt,
31 unsigned long type)
32 {
33 unsigned long pte;
34 pte_t ptep;
35
36 ptep = pfn_pte(phys >> PAGE_SHIFT, PAGE_KERNEL);
37 pte = pte_val(ptep);
38 pte |= type;
39
40 sun3_put_pte(virt, pte);
41
42 #ifdef SUN3_KMAP_DEBUG
43 print_pte_vaddr(virt);
44 #endif
45
46 }
47
do_pmeg_mapin(unsigned long phys,unsigned long virt,unsigned long type,int pages)48 static inline void do_pmeg_mapin(unsigned long phys, unsigned long virt,
49 unsigned long type, int pages)
50 {
51
52 if(sun3_get_segmap(virt & ~SUN3_PMEG_MASK) == SUN3_INVALID_PMEG)
53 mmu_emu_map_pmeg(sun3_get_context(), virt);
54
55 while(pages) {
56 do_page_mapin(phys, virt, type);
57 phys += PAGE_SIZE;
58 virt += PAGE_SIZE;
59 pages--;
60 }
61 }
62
sun3_ioremap(unsigned long phys,unsigned long size,unsigned long type)63 void __iomem *sun3_ioremap(unsigned long phys, unsigned long size,
64 unsigned long type)
65 {
66 struct vm_struct *area;
67 unsigned long offset, virt, ret;
68 int pages;
69
70 if(!size)
71 return NULL;
72
73 /* page align */
74 offset = phys & (PAGE_SIZE-1);
75 phys &= ~(PAGE_SIZE-1);
76
77 size += offset;
78 size = PAGE_ALIGN(size);
79 if((area = get_vm_area(size, VM_IOREMAP)) == NULL)
80 return NULL;
81
82 #ifdef SUN3_KMAP_DEBUG
83 printk("ioremap: got virt %p size %lx(%lx)\n",
84 area->addr, size, area->size);
85 #endif
86
87 pages = size / PAGE_SIZE;
88 virt = (unsigned long)area->addr;
89 ret = virt + offset;
90
91 while(pages) {
92 int seg_pages;
93
94 seg_pages = (SUN3_PMEG_SIZE - (virt & SUN3_PMEG_MASK)) / PAGE_SIZE;
95 if(seg_pages > pages)
96 seg_pages = pages;
97
98 do_pmeg_mapin(phys, virt, type, seg_pages);
99
100 pages -= seg_pages;
101 phys += seg_pages * PAGE_SIZE;
102 virt += seg_pages * PAGE_SIZE;
103 }
104
105 return (void __iomem *)ret;
106
107 }
108 EXPORT_SYMBOL(sun3_ioremap);
109
110
__ioremap(unsigned long phys,unsigned long size,int cache)111 void __iomem *__ioremap(unsigned long phys, unsigned long size, int cache)
112 {
113
114 return sun3_ioremap(phys, size, SUN3_PAGE_TYPE_IO);
115
116 }
117 EXPORT_SYMBOL(__ioremap);
118
iounmap(void __iomem * addr)119 void iounmap(void __iomem *addr)
120 {
121 vfree((void *)(PAGE_MASK & (unsigned long)addr));
122 }
123 EXPORT_SYMBOL(iounmap);
124
125 /* sun3_map_test(addr, val) -- Reads a byte from addr, storing to val,
126 * trapping the potential read fault. Returns 0 if the access faulted,
127 * 1 on success.
128 *
129 * This function is primarily used to check addresses on the VME bus.
130 *
131 * Mucking with the page fault handler seems a little hackish to me, but
132 * SunOS, NetBSD, and Mach all implemented this check in such a manner,
133 * so I figure we're allowed.
134 */
sun3_map_test(unsigned long addr,char * val)135 int sun3_map_test(unsigned long addr, char *val)
136 {
137 int ret = 0;
138
139 __asm__ __volatile__
140 (".globl _sun3_map_test_start\n"
141 "_sun3_map_test_start:\n"
142 "1: moveb (%2), (%0)\n"
143 " moveq #1, %1\n"
144 "2:\n"
145 ".section .fixup,\"ax\"\n"
146 ".even\n"
147 "3: moveq #0, %1\n"
148 " jmp 2b\n"
149 ".previous\n"
150 ".section __ex_table,\"a\"\n"
151 ".align 4\n"
152 ".long 1b,3b\n"
153 ".previous\n"
154 ".globl _sun3_map_test_end\n"
155 "_sun3_map_test_end:\n"
156 : "=a"(val), "=r"(ret)
157 : "a"(addr));
158
159 return ret;
160 }
161 EXPORT_SYMBOL(sun3_map_test);
162