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Diffstat (limited to 'board/incaip/memsetup.S')
| -rw-r--r-- | board/incaip/memsetup.S | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/board/incaip/memsetup.S b/board/incaip/memsetup.S new file mode 100644 index 0000000..4faf627 --- /dev/null +++ b/board/incaip/memsetup.S @@ -0,0 +1,151 @@ +/* + * Memory sub-system initialization code for INCA-IP development board. + * + * Copyright (c) 2003 Wolfgang Denk <wd@denx.de> + * + * 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 <config.h> +#include <version.h> +#include <asm/regdef.h> + + +#define EBU_MODUL_BASE 0xB8000200 +#define EBU_CLC(value) 0x0000(value) +#define EBU_CON(value) 0x0010(value) +#define EBU_ADDSEL0(value) 0x0020(value) +#define EBU_ADDSEL1(value) 0x0024(value) +#define EBU_ADDSEL2(value) 0x0028(value) +#define EBU_BUSCON0(value) 0x0060(value) +#define EBU_BUSCON1(value) 0x0064(value) +#define EBU_BUSCON2(value) 0x0068(value) + +#define MC_MODUL_BASE 0xBF800000 +#define MC_ERRCAUSE(value) 0x0100(value) +#define MC_ERRADDR(value) 0x0108(value) +#define MC_IOGP(value) 0x0800(value) +#define MC_SELFRFSH(value) 0x0A00(value) +#define MC_CTRLENA(value) 0x1000(value) +#define MC_MRSCODE(value) 0x1008(value) +#define MC_CFGDW(value) 0x1010(value) +#define MC_CFGPB0(value) 0x1018(value) +#define MC_LATENCY(value) 0x1038(value) +#define MC_TREFRESH(value) 0x1040(value) + +#if CPU_CLOCK_RATE==150000000 /* 150 MHz clock for the MIPS core */ +#define CGU_MODUL_BASE 0xBF107000 +#define CGU_PLL1CR(value) 0x0008(value) +#define CGU_DIVCR(value) 0x0010(value) +#define CGU_MUXCR(value) 0x0014(value) +#define CGU_PLL1SR(value) 0x000C(value) +#endif + + .globl memsetup +memsetup: + + /* EBU Initialization for the Flash CS0 and CS2. + */ + li t0, EBU_MODUL_BASE + + li t1, 0xA0000041 + sw t1, EBU_ADDSEL0(t0) + +#if CPU_CLOCK_RATE==150000000 /* 150 MHz clock for the MIPS core */ + li t1, 0xE841417E + sw t1, EBU_BUSCON0(t0) /* value set up by magic flash word */ + sw t1, EBU_BUSCON2(t0) +#else /* 100 MHz */ + lw t1, EBU_BUSCON0(t0) /* value set up by magic flash word */ + sw t1, EBU_BUSCON2(t0) +#endif + + li t1, 0xA0800041 + sw t1, EBU_ADDSEL2(t0) + + /* Need to initialize CS1 too, so as to to prevent overlapping with + * Flash bank 1. + */ + li t1, 0xBE0000F1 + sw t1, EBU_ADDSEL1(t0) + +#if CPU_CLOCK_RATE==150000000 /* 150 MHz clock for the MIPS core */ + li t1, 0x684143FD +#else /* 100 MHz */ + li t1, 0x684142BD +#endif + sw t1, EBU_BUSCON1(t0) + +#if CPU_CLOCK_RATE==150000000 /* 150 MHz clock for the MIPS core */ + li t0, CGU_MODUL_BASE + li t1, 0x80000017 + sw t1, CGU_DIVCR(t0) + li t1, 0xC00B0001 + sw t1, CGU_PLL1CR(t0) + lui t2, 0x8000 +b1: + lw t1, CGU_PLL1SR(t0) + and t1, t1, t2 + beq t1, zero, b1 + li t1, 0x80000001 + sw t1, CGU_MUXCR(t0) +#endif + + /* SDRAM Initialization. + */ + li t0, MC_MODUL_BASE + + /* Clear Error log registers */ + sw zero, MC_ERRCAUSE(t0) + sw zero, MC_ERRADDR(t0) + + /* Set clock ratio to 1:1 */ + li t1, 0x03 /* clkrat=1:1, rddel=3 */ + sw t1, MC_IOGP(t0) + + /* Clear Power-down registers */ + sw zero, MC_SELFRFSH(t0) + + /* Set CAS Latency */ + li t1, 0x00000020 /* CL = 2 */ + sw t1, MC_MRSCODE(t0) + + /* Set word width to 16 bit */ + li t1, 0x2 + sw t1, MC_CFGDW(t0) + + /* Set CS0 to SDRAM parameters */ + li t1, 0x000014C9 + sw t1, MC_CFGPB0(t0) + + /* Set SDRAM latency parameters */ + li t1, 0x00026325 /* BC PC100 */ + sw t1, MC_LATENCY(t0) + + /* Set SDRAM refresh rate */ + li t1, 0x00000C30 /* 4K/64ms @ 100MHz */ + sw t1, MC_TREFRESH(t0) + + /* Finally enable the controller */ + li t1, 1 + sw t1, MC_CTRLENA(t0) + + j ra + nop + |