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author | Stefan Roese <sr@denx.de> | 2005-08-01 14:49:12 (GMT) |
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committer | Stefan Roese <stefan@debian.(none)> | 2005-08-01 14:49:12 (GMT) |
commit | 8a316c9b6215266b8f5f7bbae5ee12e8b8afac83 (patch) | |
tree | 52477fa047556404d79d61c7cefd6ab3d79c0441 /board/amcc/bamboo/init.S | |
parent | c157d8e219694f5c3dea1ed3826668bdc67ca093 (diff) | |
download | u-boot-8a316c9b6215266b8f5f7bbae5ee12e8b8afac83.tar.xz |
Major cleanup for AMCC PPC4xx eval boards.
Patch by Stefan Roese, 01 Aug 2005
Diffstat (limited to 'board/amcc/bamboo/init.S')
-rw-r--r-- | board/amcc/bamboo/init.S | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/board/amcc/bamboo/init.S b/board/amcc/bamboo/init.S new file mode 100644 index 0000000..7ba43c7 --- /dev/null +++ b/board/amcc/bamboo/init.S @@ -0,0 +1,107 @@ +/* +* +* See file CREDITS for list of people who contributed to this +* project. +* +* This program is free software; you can redistribute it and/or +* modify it under the terms of the GNU General Public License as +* published by the Free Software Foundation; either version 2 of +* the License, or (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 59 Temple Place, Suite 330, Boston, +* MA 02111-1307 USA +*/ + +#include <ppc_asm.tmpl> +#include <config.h> + +/* General */ +#define TLB_VALID 0x00000200 + +/* Supported page sizes */ + +#define SZ_1K 0x00000000 +#define SZ_4K 0x00000010 +#define SZ_16K 0x00000020 +#define SZ_64K 0x00000030 +#define SZ_256K 0x00000040 +#define SZ_1M 0x00000050 +#define SZ_8M 0x00000060 +#define SZ_16M 0x00000070 +#define SZ_256M 0x00000090 + +/* Storage attributes */ +#define SA_W 0x00000800 /* Write-through */ +#define SA_I 0x00000400 /* Caching inhibited */ +#define SA_M 0x00000200 /* Memory coherence */ +#define SA_G 0x00000100 /* Guarded */ +#define SA_E 0x00000080 /* Endian */ + +/* Access control */ +#define AC_X 0x00000024 /* Execute */ +#define AC_W 0x00000012 /* Write */ +#define AC_R 0x00000009 /* Read */ + +/* Some handy macros */ + +#define EPN(e) ((e) & 0xfffffc00) +#define TLB0(epn,sz) ( (EPN((epn)) | (sz) | TLB_VALID ) ) +#define TLB1(rpn,erpn) ( ((rpn)&0xfffffc00) | (erpn) ) +#define TLB2(a) ( (a)&0x00000fbf ) + +#define tlbtab_start\ + mflr r1 ;\ + bl 0f ; + +#define tlbtab_end\ + .long 0, 0, 0 ; \ +0: mflr r0 ; \ + mtlr r1 ; \ + blr ; + +#define tlbentry(epn,sz,rpn,erpn,attr)\ + .long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr) + + +/************************************************************************** + * TLB TABLE + * + * This table is used by the cpu boot code to setup the initial tlb + * entries. Rather than make broad assumptions in the cpu source tree, + * this table lets each board set things up however they like. + * + * Pointer to the table is returned in r1 + * + *************************************************************************/ + + .section .bootpg,"ax" + .globl tlbtab + +tlbtab: + tlbtab_start + /* + 0xf0000000 must be first, before relocation SA_I must be off to use the + dcache as stack. It is patched after relocation to enable SA_I + */ + tlbentry( 0xf0000000, SZ_256M, 0xf0000000, 0, AC_R|AC_W|AC_X|SA_G/*|SA_I*/) + tlbentry( CFG_SDRAM_BASE, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) + tlbentry( CFG_PCI_BASE, SZ_256M, 0xE0000000, 0, AC_R|AC_W|SA_G|SA_I ) + tlbentry( CFG_NVRAM_BASE_ADDR, SZ_16K, 0x80000000, 0, AC_R|AC_W|AC_X|SA_W|SA_I ) + + /* PCI */ + tlbentry( CFG_PCI_MEMBASE, SZ_256M, CFG_PCI_MEMBASE, 0, AC_R|AC_W|SA_G|SA_I ) + tlbentry( CFG_PCI_MEMBASE1, SZ_256M, CFG_PCI_MEMBASE1, 0, AC_R|AC_W|SA_G|SA_I ) + tlbentry( CFG_PCI_MEMBASE2, SZ_256M, CFG_PCI_MEMBASE2, 0, AC_R|AC_W|SA_G|SA_I ) + tlbentry( CFG_PCI_MEMBASE3, SZ_256M, CFG_PCI_MEMBASE3, 0, AC_R|AC_W|SA_G|SA_I ) + + /* USB 2.0 Device */ + tlbentry( CFG_USB_DEVICE, SZ_1K, 0x50000000, 0, AC_R|AC_W|SA_G|SA_I ) + + tlbtab_end |