| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 secunet Security Networks AG |
| * |
| * 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; version 2 of |
| * the License. |
| * |
| * 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. |
| */ |
| |
| #include <types.h> |
| #include <arch/io.h> |
| #include <device/pci_ops.h> |
| #include <halt.h> |
| #include "gm45.h" |
| |
| void gm45_early_reset(void/*const timings_t *const timings*/) |
| { |
| int ch, r; |
| |
| /* Reset DRAM power-up settings in CLKCFG (they are not |
| affected by system reset but may disrupt raminit). */ |
| MCHBAR32(CLKCFG_MCHBAR) = |
| (MCHBAR32(CLKCFG_MCHBAR) & ~(3 << 21)) | (1 << 3); |
| |
| /*\ Next settings are the real purpose of this function: |
| If these steps are not performed, reset results in power off. \*/ |
| |
| /* Initialize some DRAM settings to 1 populated rank of 128MB. */ |
| FOR_EACH_CHANNEL(ch) { |
| /* Configure DRAM control mode. */ |
| MCHBAR32(CxDRC0_MCHBAR(ch)) = |
| (MCHBAR32(CxDRC0_MCHBAR(ch)) & ~CxDRC0_RANKEN_MASK) | |
| (ch ? 0 : CxDRC0_RANKEN(0)); |
| MCHBAR32(CxDRC1_MCHBAR(ch)) = |
| (MCHBAR32(CxDRC1_MCHBAR(ch)) | CxDRC1_NOTPOP_MASK) & |
| ~(ch ? 0 : CxDRC1_NOTPOP(0)); |
| MCHBAR32(CxDRC2_MCHBAR(ch)) = |
| (MCHBAR32(CxDRC2_MCHBAR(ch)) | CxDRC2_NOTPOP_MASK) & |
| ~(ch ? 0 : CxDRC2_NOTPOP(0)); |
| /*if (timings && (timings->mem_clock == MEM_CLOCK_1067MT)) |
| MCHBAR32(CxDRC2_MCHBAR(ch)) |= CxDRC2_CLK1067MT;*/ |
| |
| /* Program rank boundaries (CxDRBy). */ |
| for (r = 0; r < RANKS_PER_CHANNEL; r += 2) |
| MCHBAR32(CxDRBy_MCHBAR(ch, r)) = |
| CxDRBy_BOUND_MB(r, 128) | |
| CxDRBy_BOUND_MB(r+1, 128); |
| } |
| /* Set DCC mode to no operation and do magic 0xf0 thing. */ |
| MCHBAR32(DCC_MCHBAR) = |
| (MCHBAR32(DCC_MCHBAR) & ~DCC_CMD_MASK) | DCC_CMD_NOP; |
| u8 reg8 = pci_read_config8(PCI_DEV(0, 0, 0), 0xf0); |
| pci_write_config8(PCI_DEV(0, 0, 0), 0xf0, reg8 & ~(1 << 2)); |
| reg8 = pci_read_config8(PCI_DEV(0, 0, 0), 0xf0); |
| pci_write_config8(PCI_DEV(0, 0, 0), 0xf0, reg8 | (1 << 2)); |
| /* Normally, we would set this after successful raminit. */ |
| MCHBAR32(DCC_MCHBAR) |= (1 << 19); |
| |
| /* Perform system reset through CF9 interface. */ |
| outb(0x02, 0xcf9); /* Set system reset bit. */ |
| outb(0x06, 0xcf9); /* Set CPU reset bit, too. */ |
| halt(); |
| } |