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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
Kumar Gala4c8d3d92005-11-13 16:06:30 -08002 * Modifications by Kumar Gala (galak@kernel.crashing.org) to support
Paul Mackerras14cf11a2005-09-26 16:04:21 +10003 * 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
Paul Mackerras14cf11a2005-09-26 16:04:21 +100017 *
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
Paul Mackerras14cf11a2005-09-26 16:04:21 +100028#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>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100052#include <asm/machdep.h>
53#include <asm/setup.h>
54
Kumar Gala99c62dd2008-04-16 05:52:21 +100055#include "mmu_decl.h"
56
Paul Mackerras14cf11a2005-09-26 16:04:21 +100057extern void loadcam_entry(unsigned int index);
58unsigned int tlbcam_index;
Trent Piepho96051462008-12-08 19:34:58 -080059static unsigned long cam[CONFIG_LOWMEM_CAM_NUM];
Paul Mackerras14cf11a2005-09-26 16:04:21 +100060
61#define NUM_TLBCAMS (16)
62
Trent Piepho96051462008-12-08 19:34:58 -080063#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
64#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
65#endif
66
Trent Piepho19f54652008-12-08 19:34:55 -080067struct tlbcam TLBCAM[NUM_TLBCAMS];
Paul Mackerras14cf11a2005-09-26 16:04:21 +100068
69struct tlbcamrange {
70 unsigned long start;
71 unsigned long limit;
72 phys_addr_t phys;
73} tlbcam_addrs[NUM_TLBCAMS];
74
75extern unsigned int tlbcam_index;
76
77/*
78 * Return PA for this VA if it is mapped by a CAM, or 0
79 */
Kumar Gala6c24b172009-02-09 21:08:07 -060080phys_addr_t v_mapped_by_tlbcam(unsigned long va)
Paul Mackerras14cf11a2005-09-26 16:04:21 +100081{
82 int b;
83 for (b = 0; b < tlbcam_index; ++b)
84 if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
85 return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
86 return 0;
87}
88
89/*
90 * Return VA for a given PA or 0 if not mapped
91 */
Kumar Gala6c24b172009-02-09 21:08:07 -060092unsigned long p_mapped_by_tlbcam(phys_addr_t pa)
Paul Mackerras14cf11a2005-09-26 16:04:21 +100093{
94 int b;
95 for (b = 0; b < tlbcam_index; ++b)
96 if (pa >= tlbcam_addrs[b].phys
97 && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
98 +tlbcam_addrs[b].phys)
99 return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
100 return 0;
101}
102
103/*
104 * Set up one of the I/D BAT (block address translation) register pairs.
105 * The parameters are not checked; in particular size must be a power
106 * of 4 between 4k and 256M.
107 */
108void settlbcam(int index, unsigned long virt, phys_addr_t phys,
109 unsigned int size, int flags, unsigned int pid)
110{
111 unsigned int tsize, lz;
112
113 asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
Kumar Galad66c82e2009-02-10 18:10:50 -0600114 tsize = 21 - lz;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000115
116#ifdef CONFIG_SMP
117 if ((flags & _PAGE_NO_CACHE) == 0)
118 flags |= _PAGE_COHERENT;
119#endif
120
121 TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
122 TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
123 TLBCAM[index].MAS2 = virt & PAGE_MASK;
124
125 TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
126 TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
127 TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
128 TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
129 TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
130
131 TLBCAM[index].MAS3 = (phys & PAGE_MASK) | MAS3_SX | MAS3_SR;
132 TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
133
134#ifndef CONFIG_KGDB /* want user access for breakpoints */
135 if (flags & _PAGE_USER) {
136 TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
137 TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
138 }
139#else
140 TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
141 TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
142#endif
143
144 tlbcam_addrs[index].start = virt;
145 tlbcam_addrs[index].limit = virt + size - 1;
146 tlbcam_addrs[index].phys = phys;
147
148 loadcam_entry(index);
149}
150
151void invalidate_tlbcam_entry(int index)
152{
153 TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index);
154 TLBCAM[index].MAS1 = ~MAS1_VALID;
155
156 loadcam_entry(index);
157}
158
Trent Piephof88747e2008-12-08 19:34:57 -0800159unsigned long __init mmu_mapin_ram(void)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000160{
Trent Piephof88747e2008-12-08 19:34:57 -0800161 unsigned long virt = PAGE_OFFSET;
162 phys_addr_t phys = memstart_addr;
163
Roel Kluin8dcd0382009-08-06 16:00:37 -0700164 while (tlbcam_index < ARRAY_SIZE(cam) && cam[tlbcam_index]) {
Benjamin Herrenschmidt8d1cf342009-03-19 19:34:08 +0000165 settlbcam(tlbcam_index, virt, phys, cam[tlbcam_index], PAGE_KERNEL_X, 0);
Trent Piephof88747e2008-12-08 19:34:57 -0800166 virt += cam[tlbcam_index];
167 phys += cam[tlbcam_index];
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000168 tlbcam_index++;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000169 }
Trent Piephof88747e2008-12-08 19:34:57 -0800170
171 return virt - PAGE_OFFSET;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000172}
173
174/*
175 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
176 */
177void __init MMU_init_hw(void)
178{
179 flush_instruction_cache();
180}
181
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000182void __init
183adjust_total_lowmem(void)
184{
Kumar Gala0aef9962008-04-16 05:52:23 +1000185 phys_addr_t ram;
Trent Piephoc8f35702008-12-08 19:34:59 -0800186 unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xff;
Trent Piephof88747e2008-12-08 19:34:57 -0800187 char buf[ARRAY_SIZE(cam) * 5 + 1], *p = buf;
188 int i;
Trent Piephoc8f35702008-12-08 19:34:59 -0800189 unsigned long virt = PAGE_OFFSET & 0xffffffffUL;
190 unsigned long phys = memstart_addr & 0xffffffffUL;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000191
Trent Piephoc8f35702008-12-08 19:34:59 -0800192 /* Convert (4^max) kB to (2^max) bytes */
193 max_cam = max_cam * 2 + 10;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000194
Trent Piephof88747e2008-12-08 19:34:57 -0800195 /* adjust lowmem size to __max_low_memory */
196 ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000197
198 /* Calculate CAM values */
Trent Piephof88747e2008-12-08 19:34:57 -0800199 __max_low_memory = 0;
200 for (i = 0; ram && i < ARRAY_SIZE(cam); i++) {
201 unsigned int camsize = __ilog2(ram) & ~1U;
Trent Piephoc8f35702008-12-08 19:34:59 -0800202 unsigned int align = __ffs(virt | phys) & ~1U;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000203
Trent Piephoc8f35702008-12-08 19:34:59 -0800204 if (camsize > align)
205 camsize = align;
Trent Piephof88747e2008-12-08 19:34:57 -0800206 if (camsize > max_cam)
207 camsize = max_cam;
Trent Piephoc8f35702008-12-08 19:34:59 -0800208
Trent Piephof88747e2008-12-08 19:34:57 -0800209 cam[i] = 1UL << camsize;
210 ram -= cam[i];
211 __max_low_memory += cam[i];
Trent Piephoc8f35702008-12-08 19:34:59 -0800212 virt += cam[i];
213 phys += cam[i];
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000214
Trent Piephof88747e2008-12-08 19:34:57 -0800215 p += sprintf(p, "%lu/", cam[i] >> 20);
216 }
217 for (; i < ARRAY_SIZE(cam); i++)
218 p += sprintf(p, "0/");
219 p[-1] = '\0';
220
Kumar Gala96a8bac2009-02-12 09:39:23 -0600221 pr_info("Memory CAM mapping: %s Mb, residual: %dMb\n", buf,
222 (unsigned int)((total_lowmem - __max_low_memory) >> 20));
Kumar Gala09b5e632008-04-16 05:52:25 +1000223 __initial_memory_limit_addr = memstart_addr + __max_low_memory;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000224}