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14cf11af | 1 | /* |
4c8d3d99 | 2 | * Modifications by Kumar Gala (galak@kernel.crashing.org) to support |
14cf11af PM |
3 | * E500 Book E processors. |
4 | * | |
5 | * Copyright 2004 Freescale Semiconductor, Inc | |
6 | * | |
7 | * This file contains the routines for initializing the MMU | |
8 | * on the 4xx series of chips. | |
9 | * -- paulus | |
10 | * | |
11 | * Derived from arch/ppc/mm/init.c: | |
12 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
13 | * | |
14 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
15 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
16 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
17 | * |
18 | * Derived from "arch/i386/mm/init.c" | |
19 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
20 | * | |
21 | * This program is free software; you can redistribute it and/or | |
22 | * modify it under the terms of the GNU General Public License | |
23 | * as published by the Free Software Foundation; either version | |
24 | * 2 of the License, or (at your option) any later version. | |
25 | * | |
26 | */ | |
27 | ||
14cf11af PM |
28 | #include <linux/signal.h> |
29 | #include <linux/sched.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/types.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/mman.h> | |
36 | #include <linux/mm.h> | |
37 | #include <linux/swap.h> | |
38 | #include <linux/stddef.h> | |
39 | #include <linux/vmalloc.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/highmem.h> | |
43 | ||
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/prom.h> | |
46 | #include <asm/io.h> | |
47 | #include <asm/mmu_context.h> | |
48 | #include <asm/pgtable.h> | |
49 | #include <asm/mmu.h> | |
50 | #include <asm/uaccess.h> | |
51 | #include <asm/smp.h> | |
14cf11af PM |
52 | #include <asm/machdep.h> |
53 | #include <asm/setup.h> | |
54 | ||
99c62dd7 KG |
55 | #include "mmu_decl.h" |
56 | ||
14cf11af PM |
57 | extern void loadcam_entry(unsigned int index); |
58 | unsigned int tlbcam_index; | |
59 | unsigned int num_tlbcam_entries; | |
60 | static unsigned long __cam0, __cam1, __cam2; | |
14cf11af PM |
61 | |
62 | #define NUM_TLBCAMS (16) | |
63 | ||
64 | struct tlbcam { | |
65 | u32 MAS0; | |
66 | u32 MAS1; | |
67 | u32 MAS2; | |
68 | u32 MAS3; | |
69 | u32 MAS7; | |
70 | } TLBCAM[NUM_TLBCAMS]; | |
71 | ||
72 | struct tlbcamrange { | |
73 | unsigned long start; | |
74 | unsigned long limit; | |
75 | phys_addr_t phys; | |
76 | } tlbcam_addrs[NUM_TLBCAMS]; | |
77 | ||
78 | extern unsigned int tlbcam_index; | |
79 | ||
80 | /* | |
81 | * Return PA for this VA if it is mapped by a CAM, or 0 | |
82 | */ | |
83 | unsigned long v_mapped_by_tlbcam(unsigned long va) | |
84 | { | |
85 | int b; | |
86 | for (b = 0; b < tlbcam_index; ++b) | |
87 | if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit) | |
88 | return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /* | |
93 | * Return VA for a given PA or 0 if not mapped | |
94 | */ | |
95 | unsigned long p_mapped_by_tlbcam(unsigned long pa) | |
96 | { | |
97 | int b; | |
98 | for (b = 0; b < tlbcam_index; ++b) | |
99 | if (pa >= tlbcam_addrs[b].phys | |
100 | && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start) | |
101 | +tlbcam_addrs[b].phys) | |
102 | return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Set up one of the I/D BAT (block address translation) register pairs. | |
108 | * The parameters are not checked; in particular size must be a power | |
109 | * of 4 between 4k and 256M. | |
110 | */ | |
111 | void settlbcam(int index, unsigned long virt, phys_addr_t phys, | |
112 | unsigned int size, int flags, unsigned int pid) | |
113 | { | |
114 | unsigned int tsize, lz; | |
115 | ||
116 | asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size)); | |
117 | tsize = (21 - lz) / 2; | |
118 | ||
119 | #ifdef CONFIG_SMP | |
120 | if ((flags & _PAGE_NO_CACHE) == 0) | |
121 | flags |= _PAGE_COHERENT; | |
122 | #endif | |
123 | ||
124 | TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1); | |
125 | TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid); | |
126 | TLBCAM[index].MAS2 = virt & PAGE_MASK; | |
127 | ||
128 | TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0; | |
129 | TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0; | |
130 | TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0; | |
131 | TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0; | |
132 | TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0; | |
133 | ||
134 | TLBCAM[index].MAS3 = (phys & PAGE_MASK) | MAS3_SX | MAS3_SR; | |
135 | TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0); | |
136 | ||
137 | #ifndef CONFIG_KGDB /* want user access for breakpoints */ | |
138 | if (flags & _PAGE_USER) { | |
139 | TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR; | |
140 | TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0); | |
141 | } | |
142 | #else | |
143 | TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR; | |
144 | TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0); | |
145 | #endif | |
146 | ||
147 | tlbcam_addrs[index].start = virt; | |
148 | tlbcam_addrs[index].limit = virt + size - 1; | |
149 | tlbcam_addrs[index].phys = phys; | |
150 | ||
151 | loadcam_entry(index); | |
152 | } | |
153 | ||
154 | void invalidate_tlbcam_entry(int index) | |
155 | { | |
156 | TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index); | |
157 | TLBCAM[index].MAS1 = ~MAS1_VALID; | |
158 | ||
159 | loadcam_entry(index); | |
160 | } | |
161 | ||
162 | void __init cam_mapin_ram(unsigned long cam0, unsigned long cam1, | |
163 | unsigned long cam2) | |
164 | { | |
99c62dd7 | 165 | settlbcam(0, PAGE_OFFSET, memstart_addr, cam0, _PAGE_KERNEL, 0); |
14cf11af PM |
166 | tlbcam_index++; |
167 | if (cam1) { | |
168 | tlbcam_index++; | |
99c62dd7 | 169 | settlbcam(1, PAGE_OFFSET+cam0, memstart_addr+cam0, cam1, _PAGE_KERNEL, 0); |
14cf11af PM |
170 | } |
171 | if (cam2) { | |
172 | tlbcam_index++; | |
99c62dd7 | 173 | settlbcam(2, PAGE_OFFSET+cam0+cam1, memstart_addr+cam0+cam1, cam2, _PAGE_KERNEL, 0); |
14cf11af PM |
174 | } |
175 | } | |
176 | ||
177 | /* | |
178 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. | |
179 | */ | |
180 | void __init MMU_init_hw(void) | |
181 | { | |
182 | flush_instruction_cache(); | |
183 | } | |
184 | ||
185 | unsigned long __init mmu_mapin_ram(void) | |
186 | { | |
187 | cam_mapin_ram(__cam0, __cam1, __cam2); | |
188 | ||
189 | return __cam0 + __cam1 + __cam2; | |
190 | } | |
191 | ||
192 | ||
193 | void __init | |
194 | adjust_total_lowmem(void) | |
195 | { | |
0aef996b KG |
196 | phys_addr_t max_lowmem_size = __max_low_memory; |
197 | phys_addr_t cam_max_size = 0x10000000; | |
198 | phys_addr_t ram; | |
14cf11af | 199 | |
0aef996b KG |
200 | /* adjust CAM size to max_lowmem_size */ |
201 | if (max_lowmem_size < cam_max_size) | |
202 | cam_max_size = max_lowmem_size; | |
14cf11af | 203 | |
0aef996b KG |
204 | /* adjust lowmem size to max_lowmem_size */ |
205 | ram = min(max_lowmem_size, total_lowmem); | |
14cf11af PM |
206 | |
207 | /* Calculate CAM values */ | |
208 | __cam0 = 1UL << 2 * (__ilog2(ram) / 2); | |
0aef996b KG |
209 | if (__cam0 > cam_max_size) |
210 | __cam0 = cam_max_size; | |
14cf11af PM |
211 | ram -= __cam0; |
212 | if (ram) { | |
213 | __cam1 = 1UL << 2 * (__ilog2(ram) / 2); | |
0aef996b KG |
214 | if (__cam1 > cam_max_size) |
215 | __cam1 = cam_max_size; | |
14cf11af PM |
216 | ram -= __cam1; |
217 | } | |
218 | if (ram) { | |
219 | __cam2 = 1UL << 2 * (__ilog2(ram) / 2); | |
0aef996b KG |
220 | if (__cam2 > cam_max_size) |
221 | __cam2 = cam_max_size; | |
14cf11af PM |
222 | ram -= __cam2; |
223 | } | |
224 | ||
225 | printk(KERN_INFO "Memory CAM mapping: CAM0=%ldMb, CAM1=%ldMb," | |
226 | " CAM2=%ldMb residual: %ldMb\n", | |
227 | __cam0 >> 20, __cam1 >> 20, __cam2 >> 20, | |
228 | (total_lowmem - __cam0 - __cam1 - __cam2) >> 20); | |
0aef996b KG |
229 | __max_low_memory = __cam0 + __cam1 + __cam2; |
230 | __initial_memory_limit = memstart_addr + __max_low_memory; | |
14cf11af | 231 | } |