| Zachary P. Landau | 552d314 | 2006-01-26 17:37:59 -0500 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000-2003 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <common.h> |
| 25 | #include <asm/m5271.h> |
| 26 | #include <asm/immap_5271.h> |
| 27 | |
| 28 | |
| 29 | int checkboard (void) { |
| 30 | puts ("Board: R5200 Ethernet Module\n"); |
| 31 | return 0; |
| 32 | }; |
| 33 | |
| 34 | long int initdram (int board_type) { |
| 35 | int i; |
| 36 | |
| 37 | /* |
| 38 | * Set CS2 pin to be SD_CS0 |
| 39 | */ |
| 40 | mbar_writeByte(MCF_GPIO_PAR_CS, mbar_readByte(MCF_GPIO_PAR_CS) |
| 41 | | MCF_GPIO_PAR_CS_PAR_CS2); |
| 42 | |
| 43 | mbar_writeByte(MCF_GPIO_PAR_SDRAM, mbar_readByte(MCF_GPIO_PAR_SDRAM) |
| 44 | | MCF_GPIO_PAR_SDRAM_PAR_CSSDCS(0x01)); |
| 45 | |
| 46 | /* |
| 47 | * Check to see if the SDRAM has already been initialized |
| 48 | * by a run control tool |
| 49 | */ |
| 50 | if (!(mbar_readLong(MCF_SDRAMC_DACR0) & MCF_SDRAMC_DACRn_RE)) |
| 51 | { |
| 52 | /* |
| 53 | * Initialize DRAM Control Register: DCR |
| 54 | */ |
| 55 | mbar_writeShort(MCF_SDRAMC_DCR, MCF_SDRAMC_DCR_RTIM(0x01) |
| 56 | | MCF_SDRAMC_DCR_RC(0x30)); |
| 57 | |
| 58 | /* |
| 59 | * Initialize DACR0 |
| 60 | */ |
| 61 | mbar_writeLong(MCF_SDRAMC_DACR0, |
| 62 | MCF_SDRAMC_DACRn_BA(CFG_SDRAM_BASE>>18) |
| 63 | | MCF_SDRAMC_DACRn_CASL(0) |
| 64 | | MCF_SDRAMC_DACRn_CBM(3) |
| 65 | | MCF_SDRAMC_DACRn_PS(2)); |
| 66 | |
| 67 | /* |
| 68 | * Initialize DMR0 |
| 69 | */ |
| 70 | mbar_writeLong(MCF_SDRAMC_DMR0, |
| 71 | MCF_SDRAMC_DMRn_BAM_8M |
| 72 | | MCF_SDRAMC_DMRn_V); |
| 73 | |
| 74 | /* |
| 75 | * Set IP bit in DACR |
| 76 | */ |
| 77 | mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) |
| 78 | | MCF_SDRAMC_DACRn_IP); |
| 79 | |
| 80 | /* |
| 81 | * Wait at least 20ns to allow banks to precharge |
| 82 | */ |
| 83 | for (i = 0; i < 5; i++) |
| 84 | asm(" nop"); |
| 85 | |
| 86 | /* |
| 87 | * Write to this block to initiate precharge |
| 88 | */ |
| 89 | *(u16 *)(CFG_SDRAM_BASE) = 0x9696; |
| 90 | |
| 91 | /* |
| 92 | * Set RE bit in DACR |
| 93 | */ |
| 94 | mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) |
| 95 | | MCF_SDRAMC_DACRn_RE); |
| 96 | |
| 97 | |
| 98 | /* |
| 99 | * Wait for at least 8 auto refresh cycles to occur |
| 100 | */ |
| 101 | for (i = 0; i < 2000; i++) |
| 102 | asm(" nop"); |
| 103 | |
| 104 | /* |
| 105 | * Finish the configuration by issuing the MRS. |
| 106 | */ |
| 107 | mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0) |
| 108 | | MCF_SDRAMC_DACRn_MRS); |
| 109 | |
| 110 | |
| 111 | /* |
| 112 | * Write to the SDRAM Mode Register |
| 113 | */ |
| 114 | *(u16 *)(CFG_SDRAM_BASE + 0x1000) = 0x9696; |
| 115 | } |
| 116 | |
| 117 | return CFG_SDRAM_SIZE * 1024 * 1024; |
| 118 | }; |
| 119 | |
| 120 | int testdram (void) { |
| 121 | /* TODO: XXX XXX XXX */ |
| 122 | printf ("DRAM test not implemented!\n"); |
| 123 | |
| 124 | return (0); |
| 125 | } |