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Stefan Roese887e2ec2006-09-07 11:51:23 +02001/*
2 *
3 * See file CREDITS for list of people who contributed to this
4 * project.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
19 * MA 02111-1307 USA
20 */
21
22#include <ppc_asm.tmpl>
23#include <config.h>
24
25/* General */
26#define TLB_VALID 0x00000200
27#define _256M 0x10000000
28
29/* Supported page sizes */
30
31#define SZ_1K 0x00000000
32#define SZ_4K 0x00000010
33#define SZ_16K 0x00000020
34#define SZ_64K 0x00000030
35#define SZ_256K 0x00000040
36#define SZ_1M 0x00000050
37#define SZ_8M 0x00000060
38#define SZ_16M 0x00000070
39#define SZ_256M 0x00000090
40
41/* Storage attributes */
42#define SA_W 0x00000800 /* Write-through */
43#define SA_I 0x00000400 /* Caching inhibited */
44#define SA_M 0x00000200 /* Memory coherence */
45#define SA_G 0x00000100 /* Guarded */
46#define SA_E 0x00000080 /* Endian */
47
48/* Access control */
49#define AC_X 0x00000024 /* Execute */
50#define AC_W 0x00000012 /* Write */
51#define AC_R 0x00000009 /* Read */
52
53/* Some handy macros */
54
55#define EPN(e) ((e) & 0xfffffc00)
56#define TLB0(epn,sz) ( (EPN((epn)) | (sz) | TLB_VALID ) )
57#define TLB1(rpn,erpn) ( ((rpn)&0xfffffc00) | (erpn) )
58#define TLB2(a) ( (a)&0x00000fbf )
59
60#define tlbtab_start\
61 mflr r1 ;\
62 bl 0f ;
63
64#define tlbtab_end\
65 .long 0, 0, 0 ; \
660: mflr r0 ; \
67 mtlr r1 ; \
68 blr ;
69
70#define tlbentry(epn,sz,rpn,erpn,attr)\
71 .long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr)
72
73
74/**************************************************************************
75 * TLB TABLE
76 *
77 * This table is used by the cpu boot code to setup the initial tlb
78 * entries. Rather than make broad assumptions in the cpu source tree,
79 * this table lets each board set things up however they like.
80 *
81 * Pointer to the table is returned in r1
82 *
83 *************************************************************************/
84 .section .bootpg,"ax"
85 .globl tlbtab
86
87tlbtab:
88 tlbtab_start
89
90 /*
91 * BOOT_CS (FLASH) must be first. Before relocation SA_I can be off to use the
92 * speed up boot process. It is patched after relocation to enable SA_I
93 */
94#ifndef CONFIG_NAND_SPL
95 tlbentry( CFG_BOOT_BASE_ADDR, SZ_256M, CFG_BOOT_BASE_ADDR, 1, AC_R|AC_W|AC_X|SA_G )
96#else
97 tlbentry( CFG_NAND_BOOT_SPL_SRC, SZ_4K, CFG_NAND_BOOT_SPL_SRC, 1, AC_R|AC_W|AC_X|SA_G )
98#endif
99
100 /* TLB-entry for DDR SDRAM (Up to 2GB) */
101 tlbentry( CFG_SDRAM_BASE, SZ_256M, CFG_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
102
103#ifdef CFG_INIT_RAM_DCACHE
104 /* TLB-entry for init-ram in dcache (SA_I must be turned off!) */
105 tlbentry( CFG_INIT_RAM_ADDR, SZ_64K, CFG_INIT_RAM_ADDR, 0, AC_R|AC_W|AC_X|SA_G )
106#endif
107
108 /* TLB-entry for PCI Memory */
109 tlbentry( CFG_PCI_MEMBASE, SZ_256M, CFG_PCI_MEMBASE, 1, AC_R|AC_W|SA_G|SA_I )
110 tlbentry( CFG_PCI_MEMBASE1, SZ_256M, CFG_PCI_MEMBASE1, 1, AC_R|AC_W|SA_G|SA_I )
111 tlbentry( CFG_PCI_MEMBASE2, SZ_256M, CFG_PCI_MEMBASE2, 1, AC_R|AC_W|SA_G|SA_I )
112 tlbentry( CFG_PCI_MEMBASE3, SZ_256M, CFG_PCI_MEMBASE3, 1, AC_R|AC_W|SA_G|SA_I )
113
114 /* TLB-entry for EBC */
115 tlbentry( CFG_BCSR_BASE, SZ_1K, CFG_BCSR_BASE, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
116
117 /* TLB-entry for NAND */
118 tlbentry( CFG_NAND_ADDR, SZ_1K, CFG_NAND_ADDR, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
119
120 /* TLB-entry for Internal Registers & OCM */
121 tlbentry( 0xe0000000, SZ_16M, 0xe0000000, 0, AC_R|AC_W|AC_X|SA_I )
122
123 /*TLB-entry PCI registers*/
124 tlbentry( 0xEEC00000, SZ_1K, 0xEEC00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I )
125
126 /* TLB-entry for peripherals */
127 tlbentry( 0xEF000000, SZ_16M, 0xEF000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
128
129 tlbtab_end
130
131#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
132 /*
133 * For NAND booting the first TLB has to be reconfigured to full size
134 * and with caching disabled after running from RAM!
135 */
136#define TLB00 TLB0(CFG_BOOT_BASE_ADDR, SZ_256M)
137#define TLB01 TLB1(CFG_BOOT_BASE_ADDR, 1)
138#define TLB02 TLB2(AC_R|AC_W|AC_X|SA_G|SA_I)
139
140 .globl reconfig_tlb0
141reconfig_tlb0:
142 sync
143 isync
144 addi r4,r0,0x0000 /* TLB entry #0 */
145 lis r5,TLB00@h
146 ori r5,r5,TLB00@l
147 tlbwe r5,r4,0x0000 /* Save it out */
148 lis r5,TLB01@h
149 ori r5,r5,TLB01@l
150 tlbwe r5,r4,0x0001 /* Save it out */
151 lis r5,TLB02@h
152 ori r5,r5,TLB02@l
153 tlbwe r5,r4,0x0002 /* Save it out */
154 sync
155 isync
156 blr
157#endif