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
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