/* * Memory sub-system initialization code for INCA-IP development board. * * Copyright (c) 2003 Wolfgang Denk * * 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 #include #include #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) #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) .set noreorder /* * void ebu_init(long) * * a0 has the clock value we are going to run at */ .globl ebu_init .ent ebu_init ebu_init: li t1, EBU_MODUL_BASE li t2, 0xA0000041 sw t2, EBU_ADDSEL0(t1) li t2, 0xA0800041 sw t2, EBU_ADDSEL2(t1) li t2, 0xBE0000F1 sw t2, EBU_ADDSEL1(t1) li t3, 100000000 beq a0, t3, 1f nop li t3, 133000000 beq a0, t3, 2f nop li t3, 150000000 beq a0, t3, 2f nop b 3f nop /* 100 MHz */ 1: li t2, 0x8841417D sw t2, EBU_BUSCON0(t1) sw t2, EBU_BUSCON2(t1) li t2, 0x684142BD b 3f sw t2, EBU_BUSCON1(t1) /* delay slot */ /* 133 or 150 MHz */ 2: li t2, 0x8841417E sw t2, EBU_BUSCON0(t1) sw t2, EBU_BUSCON2(t1) li t2, 0x684143FD sw t2, EBU_BUSCON1(t1) 3: j ra nop .end ebu_init /* * void cgu_init(long) * * a0 has the clock value */ .globl cgu_init .ent cgu_init cgu_init: li t1, CGU_MODUL_BASE li t3, 100000000 beq a0, t3, 1f nop li t3, 133000000 beq a0, t3, 2f nop li t3, 150000000 beq a0, t3, 3f nop b 5f nop /* 100 MHz clock */ 1: li t2, 0x80000014 sw t2, CGU_DIVCR(t1) li t2, 0x80000000 sw t2, CGU_MUXCR(t1) li t2, 0x800B0001 b 5f sw t2, CGU_PLL1CR(t1) /* delay slot */ /* 133 MHz clock */ 2: li t2, 0x80000054 sw t2, CGU_DIVCR(t1) li t2, 0x80000000 sw t2, CGU_MUXCR(t1) li t2, 0x800B0001 b 5f sw t2, CGU_PLL1CR(t1) /* delay slot */ /* 150 MHz clock */ 3: li t2, 0x80000017 sw t2, CGU_DIVCR(t1) li t2, 0xC00B0001 sw t2, CGU_PLL1CR(t1) li t3, 0x80000000 4: lw t2, CGU_PLL1SR(t1) and t2, t2, t3 beq t2, zero, 4b nop li t2, 0x80000001 sw t2, CGU_MUXCR(t1) 5: j ra nop .end cgu_init .globl memsetup .ent memsetup memsetup: /* EBU and CGU Initialization. */ li a0, CPU_CLOCK_RATE move t0, ra /* We rely on the fact that neither ebu_init() nor cgu_init() * modify t0 and a0. */ bal ebu_init nop bal cgu_init nop move ra, t0 /* 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 .end memsetup