src/northbridge/intel/pineview/raminit.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015  Damien Zammit <damien@zamaudio.com>
 *
 * 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.
 */

#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <delay.h>
#include <halt.h>
#include <lib.h>
#include "pineview.h"
#include "raminit.h"
#include <pc80/mc146818rtc.h>
#include <spd.h>
#include <string.h>

/* Debugging macros. */
#if CONFIG_DEBUG_RAM_SETUP
#define PRINTK_DEBUG(x...)	printk(BIOS_DEBUG, x)
#else
#define PRINTK_DEBUG(x...)
#endif

#define MAX_TCLK_667	0x30
#define MAX_TCLK_800	0x25
#define MAX_TAC_667	0x45
#define MAX_TAC_800	0x40

#define NOP_CMD		(1 << 1)
#define PRE_CHARGE_CMD	(1 << 2)
#define MRS_CMD		((1 << 2) | (1 << 1))
#define EMRS_CMD	(1 << 3)
#define EMRS1_CMD	(EMRS_CMD | (1 << 4))
#define EMRS2_CMD	(EMRS_CMD | (1 << 5))
#define EMRS3_CMD	(EMRS_CMD | (1 << 5) | (1 << 4))
#define ZQCAL_CMD	((1 << 3) | (1 << 1))
#define CBR_CMD		((1 << 3) | (1 << 2))
#define NORMAL_OP_CMD	((1 << 3) | (1 << 2) | (1 << 1))

#define UBDIMM 1
#define SODIMM 2

#define TOTAL_CHANNELS 1
#define TOTAL_DIMMS 2

#define DIMM_IS_POPULATED(dimms, idx) (dimms[idx].card_type != 0)
#define IF_DIMM_POPULATED(dimms, idx) if (dimms[idx].card_type != 0)
#define ONLY_DIMMA_IS_POPULATED(dimms, ch) ( \
	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2) && \
	!DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3)))
#define ONLY_DIMMB_IS_POPULATED(dimms, ch) ( \
	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3) && \
	!DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2)))
#define BOTH_DIMMS_ARE_POPULATED(dimms, ch) ( \
	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2) && \
	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3))))
#define FOR_EACH_DIMM(idx) \
	for (idx = 0; idx < TOTAL_DIMMS; ++idx)
#define FOR_EACH_POPULATED_DIMM(dimms, idx) \
	FOR_EACH_DIMM(idx) IF_DIMM_POPULATED(dimms, idx)
#define CHANNEL_IS_POPULATED(dimms, idx) ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
#define CHANNEL_IS_CARDF(dimms, idx) ((dimms[idx<<1].card_type == 0xf) || (dimms[(idx<<1) + 1].card_type == 0xf))
#define IF_CHANNEL_POPULATED(dimms, idx) if ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
#define FOR_EACH_CHANNEL(idx) \
	for (idx = 0; idx < TOTAL_CHANNELS; ++idx)
#define FOR_EACH_POPULATED_CHANNEL(dimms, idx) \
	FOR_EACH_CHANNEL(idx) IF_CHANNEL_POPULATED(dimms, idx)

#define RANKS_PER_CHANNEL 4

#define FOR_EACH_RANK_IN_CHANNEL(r) \
	for (r = 0; r < RANKS_PER_CHANNEL; ++r)
#define FOR_EACH_POPULATED_RANK_IN_CHANNEL(dimms, ch, r) \
	FOR_EACH_RANK_IN_CHANNEL(r) if (rank_is_populated(dimms, ch, r))
#define FOR_EACH_RANK(ch, r) \
	FOR_EACH_CHANNEL(ch) FOR_EACH_RANK_IN_CHANNEL(r)
#define FOR_EACH_POPULATED_RANK(dimms, ch, r) \
	FOR_EACH_RANK(ch, r) if (rank_is_populated(dimms, ch, r))

static bool rank_is_populated(struct dimminfo dimms[], u8 ch, u8 r)
{
	return ((dimms[ch<<1].card_type && ((r) < dimms[ch<<1].ranks))
		|| (dimms[(ch<<1) + 1].card_type
			&& ((r) >= 2)
			&& ((r) < (dimms[(ch<<1) + 1].ranks + 2))));
}

static inline void barrier(void)
{
	 __asm__ __volatile__("": : :"memory");
}

static inline int spd_read_byte(unsigned device, unsigned address)
{
	return smbus_read_byte(device, address);
}

static int decode_spd(struct dimminfo *d, int i)
{
	d->type = 0;
	if (d->spd_data[20] == 0x2) {
		d->type = UBDIMM;
	} else if (d->spd_data[20] == 0x4) {
		d->type = SODIMM;
	}
	d->sides = (d->spd_data[5] & 0x7) + 1;
	d->banks = (d->spd_data[17] >> 2) - 1;
	d->chip_capacity = d->banks;
	d->rows = d->spd_data[3];// - 12;
	d->cols = d->spd_data[4];// - 9;
	d->cas_latencies = 0x78;
	d->cas_latencies &= d->spd_data[18];
	if (d->cas_latencies == 0)
		d->cas_latencies = 7;
	d->tAAmin = d->spd_data[26];
	d->tCKmin = d->spd_data[25];
	d->width = (d->spd_data[13] >> 3) - 1;
	d->page_size = (d->width+1) * (1 << d->cols); // Bytes
	d->tRAS = d->spd_data[30];
	d->tRP = d->spd_data[27];
	d->tRCD = d->spd_data[29];
	d->tWR = d->spd_data[36];
	d->ranks = d->sides; // XXX
#if CONFIG_DEBUG_RAM_SETUP
	const char *ubso[2] = { "UB", "SO" };
#endif
	PRINTK_DEBUG("%s-DIMM %d\n", &ubso[d->type][0], i);
	PRINTK_DEBUG("  Sides     : %d\n", d->sides);
	PRINTK_DEBUG("  Banks     : %d\n", d->banks);
	PRINTK_DEBUG("  Ranks     : %d\n", d->ranks);
	PRINTK_DEBUG("  Rows      : %d\n", d->rows);
	PRINTK_DEBUG("  Cols      : %d\n", d->cols);
	PRINTK_DEBUG("  Page size : %d\n", d->page_size);
	PRINTK_DEBUG("  Width     : %d\n", (d->width + 1) * 8);

	return 0;
}

/* Ram Config:    DIMMB-DIMMA
 *		0 EMPTY-EMPTY
 *		1 EMPTY-x16SS
 *		2 EMPTY-x16DS
 *		3 x16SS-x16SS
 *		4 x16DS-x16DS
 *		5 EMPTY- x8DS
 *		6 x8DS - x8DS
 */
static void find_ramconfig(struct sysinfo *s, u32 chan)
{
	if (s->dimms[chan>>1].sides == 0) {
		// NC
		if (s->dimms[(chan>>1) + 1].sides == 0) {
			// NC/NC
			s->dimm_config[chan] = 0;
		} else if (s->dimms[(chan>>1) + 1].sides == 1) {
			// NC/SS
			if (s->dimms[(chan>>1) + 1].width == 0) {
				// NC/8SS
				s->dimm_config[chan] = 1;
			} else {
				// NC/16SS
				s->dimm_config[chan] = 1;
			}
		} else {
			// NC/DS
			if (s->dimms[(chan>>1) + 1].width == 0) {
				// NC/8DS
				s->dimm_config[chan] = 5;
			} else {
				// NC/16DS
				s->dimm_config[chan] = 2;
			}
		}
	} else if (s->dimms[chan>>1].sides == 1) {
		// SS
		if (s->dimms[(chan>>1) + 1].sides == 0) {
			// SS/NC
			if (s->dimms[chan>>1].width == 0) {
				// 8SS/NC
				s->dimm_config[chan] = 1;
			} else {
				// 16SS/NC
				s->dimm_config[chan] = 1;
			}
		} else if (s->dimms[(chan>>1) + 1].sides == 1) {
			// SS/SS
			if (s->dimms[chan>>1].width == 0) {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					// 8SS/8SS
					s->dimm_config[chan] = 3;
				} else {
					// 8SS/16SS
					die("Mixed Not supported\n");
				}
			} else {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					// 16SS/8SS
					die("Mixed Not supported\n");
				} else {
					// 16SS/16SS
					s->dimm_config[chan] = 3;
				}
			}
		} else {
			// SS/DS
			if (s->dimms[chan>>1].width == 0) {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					// 8SS/8DS
					die("Mixed Not supported\n");
				} else {
					die("Mixed Not supported\n");
				}
			} else {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					// 16SS/8DS
					die("Mixed Not supported\n");
				} else {
					die("Mixed Not supported\n");
				}
			}
		}
	} else {
		// DS
		if (s->dimms[(chan>>1) + 1].sides == 0) {
			// DS/NC
			if (s->dimms[chan>>1].width == 0) {
				// 8DS/NC
				s->dimm_config[chan] = 5;
			} else {
				s->dimm_config[chan] = 4;
			}
		} else if (s->dimms[(chan>>1) + 1].sides == 1) {
			// DS/SS
			if (s->dimms[chan>>1].width == 0) {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					// 8DS/8SS
					die("Mixed Not supported\n");
				} else {
					// 8DS/16SS
					die("Mixed Not supported\n");
				}
			} else {
				if (s->dimms[(chan>>1) + 1].width == 0) {
					die("Mixed Not supported\n");
				} else {
					// 16DS/16DS
					s->dimm_config[chan] = 4;
				}
			}
		} else {
			// DS/DS
			if (s->dimms[chan>>1].width == 0 && s->dimms[(chan>>1)+1].width == 0) {
				// 8DS/8DS
				s->dimm_config[chan] = 6;
			}
		}
	}
}

static void sdram_read_spds(struct sysinfo *s)
{
	u8 i, j, chan;
	int status = 0;
	s->dt0mode = 0;
	FOR_EACH_DIMM(i) {
		for (j = 0; j < 64; j++) {
			status = spd_read_byte(s->spd_map[i], j);
			if (status < 0) {
				s->dimms[i].card_type = 0;
				break;
			}
			s->dimms[i].spd_data[j] = (u8) status;
			if (j == 62)
				s->dimms[i].card_type = ((u8) status) & 0x1f;
		}
		hexdump(s->dimms[i].spd_data, 64);
	}

	s->spd_type = 0;
	FOR_EACH_POPULATED_DIMM(s->dimms, i) {
		switch (s->dimms[i].spd_data[2]) {
			case 0x8:
				s->spd_type = DDR2;
				break;
			case 0xb:
			default:
				die("DIMM type mismatch\n");
				break;
		}
	}

	int err = 1;
	FOR_EACH_POPULATED_DIMM(s->dimms, i) {
		err = decode_spd(&s->dimms[i], i);
		s->dt0mode |= (s->dimms[i].spd_data[49] & 0x2) >> 1;
	}
	if (err) {
		die("No memory dimms, halt\n");
	}

	FOR_EACH_POPULATED_CHANNEL(s->dimms, chan) {
		find_ramconfig(s, chan);
		PRINTK_DEBUG("  Config[CH%d] : %d\n",
			chan, s->dimm_config[chan]);
	}
}

#if CONFIG_DEBUG_RAM_SETUP
static u32 fsb_reg_to_mhz(u32 speed)
{
	return (speed * 133) + 667;
}

static u32 ddr_reg_to_mhz(u32 speed)
{
	u32 mhz;
	mhz = (speed == 0) ? 667 :
		(speed == 1) ? 800 :
		0;
	return mhz;
}
#endif

static u8 lsbpos(u8 val) //Forward
{
	u8 i;
	for (i = 0; (i < 8) && ((val & (1 << i)) == 0); i++);
	return i;
}

static u8 msbpos(u8 val) //Reverse
{
	u8 i;
	for (i = 7; (i >= 0) && ((val & (1 << i)) == 0); i--);
	return i;
}

static void sdram_detect_smallest_params(struct sysinfo *s)
{
	u16 mult[6] = {
		3000, // 667
		2500, // 800
	};

	u8 i;
	u32 tmp;
	u32 maxtras = 0;
	u32 maxtrp = 0;
	u32 maxtrcd = 0;
	u32 maxtwr = 0;
	u32 maxtrfc = 0;
	u32 maxtwtr = 0;
	u32 maxtrrd = 0;
	u32 maxtrtp = 0;

	FOR_EACH_POPULATED_DIMM(s->dimms, i) {
		maxtras = max(maxtras, s->dimms[i].spd_data[30] * 1000);
		maxtrp = max(maxtrp, (s->dimms[i].spd_data[27] * 1000) >> 2);
		maxtrcd = max(maxtrcd, (s->dimms[i].spd_data[29] * 1000) >> 2);
		maxtwr = max(maxtwr, (s->dimms[i].spd_data[36] * 1000) >> 2);
		maxtrfc = max(maxtrfc, s->dimms[i].spd_data[42] * 1000 +
				(s->dimms[i].spd_data[40] & 0xf));
		maxtwtr = max(maxtwtr, (s->dimms[i].spd_data[37] * 1000) >> 2);
		maxtrrd = max(maxtrrd, (s->dimms[i].spd_data[28] * 1000) >> 2);
		maxtrtp = max(maxtrtp, (s->dimms[i].spd_data[38] * 1000) >> 2);
	}
	for (i = 9; i < 24; i++) { // 16
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtras) {
			s->selected_timings.tRAS = i;
			break;
		}
	}
	for (i = 3; i < 10; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtrp) {
			s->selected_timings.tRP = i;
			break;
		}
	}
	for (i = 3; i < 10; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtrcd) {
			s->selected_timings.tRCD = i;
			break;
		}
	}
	for (i = 3; i < 15; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtwr) {
			s->selected_timings.tWR = i;
			break;
		}
	}
	for (i = 15; i < 78; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtrfc) {
			s->selected_timings.tRFC = ((i + 16) & 0xfe) - 15;
			break;
		}
	}
	for (i = 4; i < 15; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtwtr) {
			s->selected_timings.tWTR = i;
			break;
		}
	}
	for (i = 2; i < 15; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtrrd) {
			s->selected_timings.tRRD = i;
			break;
		}
	}
	for (i = 4; i < 15; i++) {
		tmp = mult[s->selected_timings.mem_clock] * i;
		if (tmp >= maxtrtp) {
			s->selected_timings.tRTP = i;
			break;
		}
	}

	PRINTK_DEBUG("Selected timings:\n");
	PRINTK_DEBUG("\tFSB:  %dMHz\n", fsb_reg_to_mhz(s->selected_timings.fsb_clock));
	PRINTK_DEBUG("\tDDR:  %dMHz\n", ddr_reg_to_mhz(s->selected_timings.mem_clock));

	PRINTK_DEBUG("\tCAS:  %d\n", s->selected_timings.CAS);
	PRINTK_DEBUG("\ttRAS: %d\n", s->selected_timings.tRAS);
	PRINTK_DEBUG("\ttRP:  %d\n", s->selected_timings.tRP);
	PRINTK_DEBUG("\ttRCD: %d\n", s->selected_timings.tRCD);
	PRINTK_DEBUG("\ttWR:  %d\n", s->selected_timings.tWR);
	PRINTK_DEBUG("\ttRFC: %d\n", s->selected_timings.tRFC);
	PRINTK_DEBUG("\ttWTR: %d\n", s->selected_timings.tWTR);
	PRINTK_DEBUG("\ttRRD: %d\n", s->selected_timings.tRRD);
	PRINTK_DEBUG("\ttRTP: %d\n", s->selected_timings.tRTP);
}

static void sdram_detect_ram_speed(struct sysinfo *s)
{
	u8 cas, reg8;
	u32 reg32;
	u32 freq = 0;
	u32 fsb = 0;
	u8 i;
	u8 commoncas = 0;
	u8 highcas = 0;
	u8 lowcas = 0;

	// Core frequency
	fsb = (pci_read_config8(PCI_DEV(0,0,0), 0xe3) & 0x70) >> 4;
	if (fsb) {
		fsb = 5 - fsb;
	} else {
		fsb = FSB_CLOCK_800MHz;
	}

	// DDR frequency
	freq = (pci_read_config8(PCI_DEV(0,0,0), 0xe3) & 0x80) >> 7;
	freq |= (pci_read_config8(PCI_DEV(0,0,0), 0xe4) & 0x3) << 1;
	if (freq) {
		freq = 6 - freq;
	} else {
		freq = MEM_CLOCK_800MHz;
	}

	// Detect a common CAS latency
	commoncas = 0xff;
	FOR_EACH_POPULATED_DIMM(s->dimms, i) {
		commoncas &= s->dimms[i].spd_data[18];
	}
	if (commoncas == 0) {
		die("No common CAS among dimms\n");
	}

	// Start with fastest common CAS
	cas = 0;
	highcas = msbpos(commoncas);
	lowcas = max(lsbpos(commoncas), 5);

	while (cas == 0 && highcas >= lowcas) {
		FOR_EACH_POPULATED_DIMM(s->dimms, i) {
			switch (freq) {
			case MEM_CLOCK_800MHz:
				if ((s->dimms[i].spd_data[9] > 0x25) ||
				    (s->dimms[i].spd_data[10] > 0x40)) {
					// CAS too fast, lower it
					highcas--;
					break;
				} else {
					cas = highcas;
				}
				break;
			case MEM_CLOCK_667MHz:
			default:
				if ((s->dimms[i].spd_data[9] > 0x30) ||
				    (s->dimms[i].spd_data[10] > 0x45)) {
					// CAS too fast, lower it
					highcas--;
					break;
				} else {
					cas = highcas;
				}
				break;
			}
		}
	}
	if (highcas < lowcas) {
		// Timings not supported by MCH, lower the frequency
		if (freq == MEM_CLOCK_800MHz) {
			freq--;
			PRINTK_DEBUG("Run DDR clock speed reduced due to timings\n");
		} else {
			die("Timings not supported by MCH\n");
		}
		cas = 0;
		highcas = msbpos(commoncas);
		lowcas = lsbpos(commoncas);
		while (cas == 0 && highcas >= lowcas) {
			FOR_EACH_POPULATED_DIMM(s->dimms, i) {
				switch (freq) {
				case MEM_CLOCK_800MHz:
					if ((s->dimms[i].spd_data[9] > 0x25) ||
					    (s->dimms[i].spd_data[10] > 0x40)) {
						// CAS too fast, lower it
						highcas--;
						break;
					} else {
						cas = highcas;
					}
					break;
				case MEM_CLOCK_667MHz:
				default:
					if ((s->dimms[i].spd_data[9] > 0x30) ||
					    (s->dimms[i].spd_data[10] > 0x45)) {
						// CAS too fast, lower it
						highcas--;
						break;
					} else {
						cas = highcas;
					}
					break;
				}
			}
		}
		if (cas == 0) {
			die("Unsupported dimms\n");
		}
	}

	s->selected_timings.CAS = cas;
	s->selected_timings.mem_clock = freq;
	s->selected_timings.fsb_clock = fsb;

	PRINTK_DEBUG("Drive Memory at %dMHz with CAS = %d clocks\n", ddr_reg_to_mhz(s->selected_timings.mem_clock), s->selected_timings.CAS);

	// Set memory frequency
	if (s->boot_path == BOOT_PATH_RESET)
		return;
	MCHBAR32(0xf14) = MCHBAR32(0xf14) | 0x1;
	reg32 = (MCHBAR32(0xc00) & (~0x70)) | (1 << 10);
	if (s->selected_timings.mem_clock == MEM_CLOCK_800MHz) {
		reg8 = 3;
	} else {
		reg8 = 2;
	}
	reg32 |= reg8 << 4;
	MCHBAR32(0xc00) = reg32;
	s->selected_timings.mem_clock = ((MCHBAR32(0xc00) >> 4) & 0x7) - 2;
	if (s->selected_timings.mem_clock == MEM_CLOCK_800MHz) {
		PRINTK_DEBUG("MCH validated at 800MHz\n");
		s->nodll = 0;
		s->maxpi = 63;
		s->pioffset = 0;
	} else if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		PRINTK_DEBUG("MCH validated at 667MHz\n");
		s->nodll = 1;
		s->maxpi = 15;
		s->pioffset = 1;
	} else {
		PRINTK_DEBUG("MCH set to unknown (%02x)\n",
			(uint8_t) s->selected_timings.mem_clock & 0xff);
	}
}

#define HPET_BASE 0xfed00000
#define HPET32(x) *((volatile u32 *)(HPET_BASE + x))
static void enable_hpet(void)
{
	u32 reg32;
	reg32 = RCBA32(0x3404);
	reg32 &= ~0x3;
	reg32 |= (1 << 7);
	RCBA32(0x3404) = reg32;
	HPET32(0x10) = HPET32(0x10) | 1;
}

static void sdram_clk_crossing(struct sysinfo *s)
{
	u8 clk_idx, fsb_idx;
	const u32 clkcross[2][2][4] = {
	{
		{0xFFFFFFFF, 0x05030305, 0x0000FFFF, 0x00000000},  //667  667
		{0x1F1F1F1F, 0x2A1F1FA5, 0x00000000, 0x05000002},  //667  800
	},
	{
		{0x1F1F1F1F, 0x0D07070B, 0x00000000, 0x00000000},  //800  667
		{0xFFFFFFFF, 0x05030305, 0x0000FFFF, 0x00000000},  //800  800
	}
	};
	clk_idx = s->selected_timings.mem_clock;
	fsb_idx = s->selected_timings.fsb_clock;

	MCHBAR32(0xc04) = clkcross[fsb_idx][clk_idx][0];
	MCHBAR32(0xc50) = clkcross[fsb_idx][clk_idx][1];
	MCHBAR32(0xc54) = clkcross[fsb_idx][clk_idx][2];
	MCHBAR32(0xc28) = 0;
	MCHBAR32(0xc2c) = clkcross[fsb_idx][clk_idx][3];
	MCHBAR32(0xc08) = MCHBAR32(0xc08) | (1 << 7);

	if ((fsb_idx == 0) && (clk_idx == 1)) {
		MCHBAR8(0x6d4) = 0;
		MCHBAR32(0x700) = 0;
		MCHBAR32(0x704) = 0;
	}

	const u32 clkcross2[2][2][8] = {
	{
		{  0,  0x08010204,  0,  0x08010204, 0, 0,  0,  0x04080102},  //  667  667
		{  0x04080000,  0x10010002,  0x10000000,  0x20010208,  0, 0x00000004,  0x02040000,  0x08100102},  //  667  800
	},
	{
		{  0x10000000,  0x20010208,  0x04080000,  0x10010002,  0, 0,  0x08000000,  0x10200204},  //  800  667
		{  0x00000000,  0x08010204,  0,  0x08010204,  0, 0,  0,  0x04080102},  //  800  800
	}
	};

	MCHBAR32(0x6d8) = clkcross2[fsb_idx][clk_idx][0];
	MCHBAR32(0x6e0) = clkcross2[fsb_idx][clk_idx][0];
	MCHBAR32(0x6e8) = clkcross2[fsb_idx][clk_idx][0];
	MCHBAR32(0x6d8+4) = clkcross2[fsb_idx][clk_idx][1];
	MCHBAR32(0x6e0+4) = clkcross2[fsb_idx][clk_idx][1];
	MCHBAR32(0x6e8+4) = clkcross2[fsb_idx][clk_idx][1];
	MCHBAR32(0x6f0) = clkcross2[fsb_idx][clk_idx][2];
	MCHBAR32(0x6f4) = clkcross2[fsb_idx][clk_idx][3];
	MCHBAR32(0x6f8) = clkcross2[fsb_idx][clk_idx][4];
	MCHBAR32(0x6fc) = clkcross2[fsb_idx][clk_idx][5];
	MCHBAR32(0x708) = clkcross2[fsb_idx][clk_idx][6];
	MCHBAR32(0x70c) = clkcross2[fsb_idx][clk_idx][7];
}

static void sdram_clkmode(struct sysinfo *s)
{
	u8 reg8;
	u16 reg16;

	MCHBAR16(0x1b6) = MCHBAR16(0x1b6) & ~(1 << 8);
	MCHBAR8(0x1b6) = MCHBAR8(0x1b6) & ~0x3f;

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		reg8 = 0;
		reg16 = 1;
	} else {
		reg8 = 1;
		reg16 = (1 << 8) | (1 << 5);
	}
	if (s->boot_path != BOOT_PATH_RESET)
		MCHBAR16(0x1c0) = (MCHBAR16(0x1c0) & ~(0x033f)) | reg16;

	MCHBAR32(0x220) = 0x58001117;
	MCHBAR32(0x248) = (MCHBAR32(0x248) | (1 << 23));

	const u32 cas_to_reg[2][4] = {
		{0x00000000, 0x00030100, 0x0C240201, 0x00000000}, // 667
		{0x00000000, 0x00030100, 0x0C240201, 0x10450302}  // 800
	};

	MCHBAR32(0x224) = cas_to_reg[reg8][s->selected_timings.CAS - 3];
}

static void sdram_timings(struct sysinfo *s)
{
	u8 i, j, ch, r, ta1, ta2, ta3, ta4, trp, bank, page, flag;
	u8 reg8, wl;
	u16 reg16;
	u32 reg32, reg2;
	u8 pagetab[2][2] = {{0xe, 0x12}, {0x10, 0x14}};

	// Only consider DDR2
	wl = s->selected_timings.CAS - 1;
	ta1 = ta2 = 6;
	ta3 = s->selected_timings.CAS;
	ta4 = 8;
	s->selected_timings.tRFC = (s->selected_timings.tRFC + 1) & 0xfe;
	trp = 0;
	bank = 1;
	page = 0;

	MCHBAR8(0x240) = ((wl - 3) << 4) | (s->selected_timings.CAS - 3);

	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
		i = ch << 1;
		if (s->dimms[i].banks == 1) {
			trp = 1;
			bank = 0;
		}
		if (s->dimms[i].page_size == 2048) {
			page = 1;
		}
	}
	PRINTK_DEBUG("trp=%d bank=%d page=%d\n",trp, bank, page);

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		flag = 0;
	} else {
		flag = 1;
	}

	MCHBAR8(0x26f) = MCHBAR8(0x26f) | 0x3;
	MCHBAR16(0x250) = ((wl + 4 + s->selected_timings.tWR) << 6) |
				((2 + MAX(s->selected_timings.tRTP, 2)) << 2) | 1;
	reg32 = (bank << 21) | (s->selected_timings.tRRD << 17) |
		(s->selected_timings.tRP << 13) |
		((s->selected_timings.tRP + trp) << 9) |
		s->selected_timings.tRFC;
	if (bank == 0) {
		reg32 |= (pagetab[flag][page] << 22);
	}
	MCHBAR16(0x252) = (u16) reg32;
	MCHBAR16(0x254) = (u16) (reg32 >> 16);

	reg16 = (MCHBAR16(0x254) & 0xfc0) >> 6;
	MCHBAR16(0x62c) = (MCHBAR16(0x62c) & ~0x1f80) | (reg16 << 7);

	reg16 = (s->selected_timings.tRCD << 12) | (4 << 8) | (ta2 << 4) | ta4;
	MCHBAR16(0x256) = reg16;

	reg32 = (s->selected_timings.tRCD << 17) |
		((wl + 4 + s->selected_timings.tWTR) << 12) |
		(ta3 << 8) | (4 << 4) | ta1;
	MCHBAR32(0x258) = reg32;

	reg16 = ((s->selected_timings.tRP + trp) << 9) |
		s->selected_timings.tRFC;
	MCHBAR8(0x25b) = (u8) reg16;
	MCHBAR8(0x25c) = (u8) (reg16 >> 8);

	MCHBAR16(0x260) = (MCHBAR16(0x260) & ~0x3fe) | (100 << 1);
	MCHBAR8(0x25d) = (MCHBAR8(0x25d) & ~0x3f) | s->selected_timings.tRAS;
	MCHBAR16(0x244) = 0x2310;

	MCHBAR8(0x246) = (MCHBAR8(0x246) & ~0x1f) | 1;

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		reg32 = 3000;
	} else {
		reg32 = 2500;
	}
	if (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) {
		reg2 = 6000;
	} else {
		reg2 = 5000;
	}
	reg16 = (u16)((((s->selected_timings.CAS + 7)*(reg32)) / reg2) << 8);
	MCHBAR16(0x248) = (MCHBAR16(0x248) & ~0x1f00) | reg16;

	flag = 0;
	if (wl > 2) {
		flag = 1;
	}
	reg16 = (u8) (wl - 1 - flag);
	reg16 |= reg16 << 4;
	reg16 |= flag << 8;
	MCHBAR16(0x24d) = (MCHBAR16(0x24d) & ~0x1ff) | reg16;

	MCHBAR16(0x25e) = 0x1585;
	MCHBAR8(0x265) = MCHBAR8(0x265) & ~0x1f;
	MCHBAR16(0x265) = (MCHBAR16(0x265) & ~0x3f00) |
		((s->selected_timings.CAS + 9) << 8);

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		reg16 = 0x514;
		reg32 = 0xa28;
	} else {
		reg16 = 0x618;
		reg32 = 0xc30;
	}
	MCHBAR32(0x268) = (MCHBAR32(0x268) & ~0xfffff00) |
		(0x3f << 22) | (reg32 << 8);
	MCHBAR8(0x26c) = 0x00;
	MCHBAR16(0x2b8) = (MCHBAR16(0x2b8) & 0xc000) | reg16;
	MCHBAR8(0x274) = MCHBAR8(0x274) | 1;

	MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0x7f000000) | (0xb << 25);
	i = s->selected_timings.mem_clock;
	j = s->selected_timings.fsb_clock;
	if (i > j) {
		MCHBAR32(0x248) = MCHBAR32(0x248) | (1 << 24);
	}

	MCHBAR8(0x24c) = MCHBAR8(0x24c) & ~0x3;
	MCHBAR16(0x24d) = (MCHBAR16(0x24d) & ~0x7c00) | ((wl + 10) << 10);
	MCHBAR32(0x260) = (MCHBAR32(0x260) & ~0x70e0000) | (3 << 24) | (3 << 17);
	reg16 = 0x15 << 6;
	reg16 |= 0x1f;
	reg16 |= (0x6 << 12);
	MCHBAR16(0x26d) = (MCHBAR16(0x26d) & ~0x7fff) | reg16;

	reg32 = (0x6 << 27) | (1 << 25);
	MCHBAR32(0x268) = (MCHBAR32(0x268) & ~0x30000000) | ((u32)(reg32 << 8));
	MCHBAR8(0x26c) = (MCHBAR8(0x26c) & ~0xfa) | ((u8)(reg32 >> 24));
	MCHBAR8(0x271) = MCHBAR8(0x271) & ~(1 << 7);
	MCHBAR8(0x274) = MCHBAR8(0x274) & ~0x6;
	reg32 = (u32) (((6 & 0x03) << 30) | (4 << 25) | (1 << 20) | (8 << 15) |
			(6 << 10) | (4 << 5) | 1);
	MCHBAR32(0x278) = reg32;

	MCHBAR16(0x27c) = (MCHBAR16(0x27c) & ~0x1ff) | (8 << 3) | (6 >> 2);
	MCHBAR16(0x125) = MCHBAR16(0x125) | 0x1c00 | (0x1f << 5);
	MCHBAR8(0x127) = (MCHBAR8(0x127) & ~0xff) | 0x40;
	MCHBAR8(0x128) = (MCHBAR8(0x128) & ~0x7) | 0x5;
	MCHBAR8(0x129) = MCHBAR8(0x129) | 0x1f;
	reg8 = 3 << 6;
	reg8 |= (s->dt0mode << 4);
	reg8 |= 0x0c;
	MCHBAR8(0x12f) = (MCHBAR8(0x12f) & ~0xdf) | reg8;
	MCHBAR8(0x18c) = MCHBAR8(0x18c) & ~0x2;
	MCHBAR8(0x228) = (MCHBAR8(0x228) & ~0x7) | 0x2;
	MCHBAR16(0x241) = (MCHBAR16(0x241) & ~0x3fc) | (4 << 2);
	reg32 = (2 << 29) | (1 << 28) | (1 << 23);
	MCHBAR32(0x120) = (MCHBAR32(0x120) & ~0xffb00000) | reg32;

	reg8 = (u8) ((MCHBAR16(0x252) & 0xe000) >> 13);
	reg8 |= (u8) ((MCHBAR16(0x254) & 1) << 3);
	MCHBAR8(0x12d) = (MCHBAR8(0x12d) & ~0xf0) | (reg8 << 4);
	reg8 = (u8) ((MCHBAR32(0x258) & 0xf0000) >> 17);
	MCHBAR8(0x12d) = (MCHBAR8(0x12d) & ~0xf) | reg8;
	MCHBAR8(0x12e) = MCHBAR8(0x12e) & ~0xfc;
	MCHBAR8(0x12e) = MCHBAR8(0x12e) & ~0x3;
	MCHBAR8(0x12f) = MCHBAR8(0x12f) & ~0x3;
	MCHBAR8(0x241) = MCHBAR8(0x241) | 1;
	MCHBAR16(0x1b6) = MCHBAR16(0x1b6) | (1 << 9);
	for (i = 0; i < 8; i++) {
		MCHBAR32(0x540 + i*4) = (MCHBAR32(0x540 + i*4) & ~0x3f3f3f3f) |
			0x0c0c0c0c;
	}
	MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000) |
		((s->selected_timings.CAS + 1) << 16);
	for (i = 0; i < 8; i++) {
		MCHBAR8(0x560 + i*4) = MCHBAR8(0x560 + i*4) & ~0x3f;
		MCHBAR16(0x58c) = MCHBAR16(0x58c) & ((u16) (~(3 << (i*2))));
		MCHBAR16(0x588) = MCHBAR16(0x588) & ((u16) (~(3 << (i*2))));
		MCHBAR16(0x5fa) = MCHBAR16(0x5fa) & ((u16) (~(3 << (i*2))));
	}
	MCHBAR8(0x5f0) = MCHBAR8(0x5f0) & ~0x1;
	MCHBAR8(0x5f0) = MCHBAR8(0x5f0) | 0x2;
	MCHBAR8(0x5f0) = MCHBAR8(0x5f0) | 0x4;
	MCHBAR32(0x2c0) = MCHBAR32(0x2c0) | 0xc0400;
	MCHBAR32(0x594) = MCHBAR32(0x594) | (1 << 31);
}

static void sdram_p_clkset0(struct pllparam *pll, u8 f, u8 i)
{
	MCHBAR16(0x5a0) = (MCHBAR16(0x5a0) & ~0xc440) |
			(pll->clkdelay[f][i] << 14) |
			(pll->dben[f][i] << 10) |
			(pll->dbsel[f][i] << 6);
	MCHBAR8(0x581) = (MCHBAR8(0x581) & ~0x3f) | pll->pi[f][i];
}

static void sdram_p_clkset1(struct pllparam *pll, u8 f, u8 i)
{
	MCHBAR16(0x5a0) = (MCHBAR16(0x5a0) & ~0x30880) |
			(pll->clkdelay[f][i] << 16) |
			(pll->dben[f][i] << 11) |
			(pll->dbsel[f][i] << 7);
	MCHBAR8(0x582) = (MCHBAR8(0x582) & ~0x3f) | pll->pi[f][i];
}

static void sdram_p_cmd(struct pllparam *pll, u8 f, u8 i)
{
	u8 reg8;
	reg8 = pll->dbsel[f][i] << 5;
	reg8 |= pll->dben[f][i] << 6;
	MCHBAR8(0x594) = (MCHBAR8(0x594) & ~0x60) | reg8;

	reg8 = pll->clkdelay[f][i] << 4;
	MCHBAR8(0x598) = (MCHBAR8(0x598) & ~0x30) | reg8;

	reg8 = pll->pi[f][i];
	MCHBAR8(0x580) = (MCHBAR8(0x580) & ~0x3f) | reg8;
	MCHBAR8(0x583) = (MCHBAR8(0x583) & ~0x3f) | reg8;
}

static void sdram_p_ctrl(struct pllparam *pll, u8 f, u8 i)
{
	u8 reg8;
	u32 reg32;
	reg32 = ((u32) pll->dbsel[f][i]) << 20;
	reg32 |= ((u32) pll->dben[f][i]) << 21;
	reg32 |= ((u32) pll->dbsel[f][i]) << 22;
	reg32 |= ((u32) pll->dben[f][i]) << 23;
	reg32 |= ((u32) pll->clkdelay[f][i]) << 24;
	reg32 |= ((u32) pll->clkdelay[f][i]) << 27;
	MCHBAR32(0x59c) = (MCHBAR32(0x59c) & ~0x1bf0000) | reg32;

	reg8 = pll->pi[f][i];
	MCHBAR8(0x584) = (MCHBAR8(0x584) & ~0x3f) | reg8;
	MCHBAR8(0x585) = (MCHBAR8(0x585) & ~0x3f) | reg8;

	reg32 = ((u32) pll->dbsel[f][i]) << 12;
	reg32 |= ((u32) pll->dben[f][i]) << 13;
	reg32 |= ((u32) pll->dbsel[f][i]) << 8;
	reg32 |= ((u32) pll->dben[f][i]) << 9;
	reg32 |= ((u32) pll->clkdelay[f][i]) << 14;
	reg32 |= ((u32) pll->clkdelay[f][i]) << 10;
	MCHBAR32(0x598) = (MCHBAR32(0x598) & ~0xff00) | reg32;

	reg8 = pll->pi[f][i];
	MCHBAR8(0x586) = (MCHBAR8(0x586) & ~0x3f) | reg8;
	MCHBAR8(0x587) = (MCHBAR8(0x587) & ~0x3f) | reg8;
}

static void sdram_p_dqs(struct pllparam *pll, u8 f, u8 clk)
{
	u8 rank, dqs, reg8, j;
	u32 reg32;

	j = clk - 40;
	reg8 = 0;
	reg32 = 0;
	rank = j % 4;
	dqs = j / 4;

	reg32 |= ((u32) pll->dben[f][clk]) << (dqs + 9);
	reg32 |= ((u32) pll->dbsel[f][clk]) << dqs;
	MCHBAR32(0x5b4+rank*4) = (MCHBAR32(0x5b4+rank*4) &
		~( (1 << (dqs+9))|(1 << dqs) )) | reg32;

	reg32 = ((u32) pll->clkdelay[f][clk]) << ((dqs*2) + 16);
	MCHBAR32(0x5c8+rank*4) = (MCHBAR32(0x5c8+rank*4) &
		~( (1 << (dqs*2 + 17))|(1 << (dqs*2 + 16)) )) | reg32;

	reg8 = pll->pi[f][clk];
	MCHBAR8(0x520+j) = (MCHBAR8(0x520+j) & ~0x3f) | reg8;
}


static void sdram_p_dq(struct pllparam *pll, u8 f, u8 clk)
{
	u8 rank, dq, reg8, j;
	u32 reg32;

	j = clk - 8;
	reg8 = 0;
	reg32 = 0;
	rank = j % 4;
	dq = j / 4;

	reg32 |= ((u32) pll->dben[f][clk]) << (dq + 9);
	reg32 |= ((u32) pll->dbsel[f][clk]) << dq;
	MCHBAR32(0x5a4+rank*4) = (MCHBAR32(0x5a4+rank*4) &
		~( (1 << (dq+9))|(1 << dq) )) | reg32;

	reg32 = ((u32) pll->clkdelay[f][clk]) << (dq*2);
	MCHBAR32(0x5c8+rank*4) = (MCHBAR32(0x5c8+rank*4) &
		~( (1 << (dq*2 + 1))|(1 << (dq*2)) )) | reg32;

	reg8 = pll->pi[f][clk];
	MCHBAR8(0x500+j) = (MCHBAR8(0x500+j) & ~0x3f) | reg8;
}

static void sdram_calibratepll(struct sysinfo *s, u8 pidelay)
{
	struct pllparam pll = {
		.pi = {
		{	// 667
			3, 3, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
			7, 7, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4,
			4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5,
			7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 1, 1, 1, 1, 3, 3, 3, 3
		},
		{	// 800
			53, 53, 10, 10, 5,  5,  5,  5,  27, 27, 27, 27,
			34, 34, 34, 34, 34, 34, 34, 34, 39, 39, 39, 39,
			47, 47, 47, 47, 44, 44, 44, 44, 47, 47, 47, 47,
			47, 47, 47, 47, 59, 59, 59, 59, 2,  2,  2,  2,
			2,  2,  2,  2,  7,  7,  7,  7,  15, 15, 15, 15,
			12, 12, 12, 12, 15, 15, 15, 15, 15, 15, 15, 15
		}},

		.dben = {
		{	// 667
			0,0,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			1,1,1,1,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0
		},
		{	// 800
			1,1,1,1,1,1,1,1,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,1,1,1,1,1,1,1,1,
			1,1,1,1,1,1,1,1,0,0,0,0,
			1,1,1,1,0,0,0,0,0,0,0,0
		}},

		.dbsel = {
		{	// 667
			0,0,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			1,1,1,1,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0
		},
		{	// 800
			0,0,1,1,1,1,1,1,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,1,1,1,1,
			1,1,1,1,1,1,1,1,0,0,0,0,
			1,1,1,1,0,0,0,0,0,0,0,0
		}},

		.clkdelay = {
		{	// 667
			0,0,1,1,0,0,0,0,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0,
			0,0,0,0,0,0,0,0,0,0,0,0
		},
		{	// 800
			0,0,0,0,0,0,0,0,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,0,0,0,0,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1,
			1,1,1,1,1,1,1,1,1,1,1,1
		}}
	};

	u8 i, f;
	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		f = 0;
	} else {
		f = 1;
	}
	for (i = 0; i < 72; i++) {
		pll.pi[f][i] += pidelay;
	}

	MCHBAR8(0x1a4) = MCHBAR8(0x1a4) & ~(1 << 7);
	MCHBAR16(0x190) = (MCHBAR16(0x190) & (u16) ~(0x3fff)) | 0x1fff;

	sdram_p_clkset0(&pll, f, 0);
	sdram_p_clkset1(&pll, f, 1);
	sdram_p_cmd(&pll, f, 2);
	sdram_p_ctrl(&pll, f, 4);
	for (i = 0; i < 32; i++) {
		sdram_p_dqs(&pll, f, i+40);
	}
	for (i = 0; i < 32; i++) {
		sdram_p_dq(&pll, f, i+8);
	}
}

static void sdram_calibratehwpll(struct sysinfo *s)
{
	u8 reg8;

	s->async = 0;
	reg8 = 0;
	MCHBAR16(0x180) = MCHBAR16(0x180) | (1 << 15);
	MCHBAR8(0x180) = MCHBAR8(0x180) & ~(1 << 7);
	MCHBAR8(0x180) = MCHBAR8(0x180) | (1 << 3);
	MCHBAR8(0x180) = MCHBAR8(0x180) | (1 << 2);

	MCHBAR8(0x180) = MCHBAR8(0x180) | (1 << 7);
	while ((MCHBAR8(0x180) & (1 << 2)) == 0);

	reg8 = (MCHBAR8(0x180) & (1 << 3)) >> 3;
	if (reg8 != 0) {
		s->async = 1;
	}
}

static void sdram_dlltiming(struct sysinfo *s)
{
	u8 reg8, i, pipost;
	u16 reg16;
	u32 reg32;

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		reg32 = 0x8014227;
	} else {
		reg32 = 0x14221;
	}
	MCHBAR32(0x19c) = (MCHBAR32(0x19c) & ~0xfffffff) | reg32;
	MCHBAR32(0x19c) = MCHBAR32(0x19c) | (1 << 23);
	MCHBAR32(0x19c) = MCHBAR32(0x19c) | (1 << 15);
	MCHBAR32(0x19c) = MCHBAR32(0x19c) & ~(1 << 15);

	if (s->nodll) {
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 0);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 2);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 4);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 8);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 10);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 12);
		MCHBAR16(0x198) = MCHBAR16(0x198) | (1 << 14);
	} else {
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 0);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 2);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 4);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 8);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 10);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 12);
		MCHBAR16(0x198) = MCHBAR16(0x198) & ~(1 << 14);
	}

	if (s->nodll) {
		MCHBAR8(0x1c8) = (MCHBAR8(0x1c8) & ~0x3f) | 0x7;
	} else {
		MCHBAR8(0x1c8) = (MCHBAR8(0x1c8) & ~0x3f);
	}

	sdram_calibratepll(s, 0); // XXX check

	MCHBAR16(0x5f0) = MCHBAR16(0x5f0) | (1 << 11);
	MCHBAR16(0x5f0) = MCHBAR16(0x5f0) | (1 << 12);

	for (i = 0; i < 8; i++) {
		MCHBAR16(0x5f0) = MCHBAR16(0x5f0) | ((1 << 10) >> i);
	}
	MCHBAR8(0x2c14) = MCHBAR8(0x2c14) | 1;
	MCHBAR16(0x182) = 0x5005;
	MCHBAR16(0x18a) = (MCHBAR16(0x18a) & ~0x1f1f) | 0x51a;
	MCHBAR16(0x2c00) = (MCHBAR16(0x2c00) & ~0xbf3f) | 0x9010;

	if (s->nodll) {
		MCHBAR8(0x18e) = (MCHBAR8(0x18e) & ~0x7f) | 0x6b;
	} else {
		MCHBAR8(0x18e) = (MCHBAR8(0x18e) & ~0x7f) | 0x55;
		sdram_calibratehwpll(s);
	}
	pipost = 0x34;

	MCHBAR32(0x248) = MCHBAR32(0x248) & ~(1 << 22);
	MCHBAR8(0x5d9) = MCHBAR8(0x5d9) & ~0x2;
	MCHBAR8(0x189) = MCHBAR8(0x189) | 0xc0;
	MCHBAR8(0x189) = MCHBAR8(0x189) & ~(1 << 5);
	MCHBAR8(0x189) = (MCHBAR8(0x189) & ~0xc0) | (1 << 6);
	MCHBAR8(0x188) = (MCHBAR8(0x188) & ~0x3f) | 0x1a;
	MCHBAR8(0x188) = MCHBAR8(0x188) | 1;

	MCHBAR8(0x1a8) = MCHBAR8(0x1a8) | 1;
	MCHBAR32(0x1a0) = 0x551803;
	if (ONLY_DIMMA_IS_POPULATED(s->dimms, 0)) {
		reg8 = 0x3c;
	} else if (ONLY_DIMMB_IS_POPULATED(s->dimms, 0)) {
		reg8 = 0x27;
	} else if (BOTH_DIMMS_ARE_POPULATED(s->dimms, 0)) {
		reg8 = 0x24;
	} else {
		// None
		reg8 = 0x3f;
	}
	reg8 = 0x00; //switch all clocks on anyway

	MCHBAR32(0x5a0) = (MCHBAR32(0x5a0) & ~0x3f000000) | (reg8 << 24);
	MCHBAR8(0x594) = MCHBAR8(0x594) & ~1;
	reg16 = 0;
	if (!rank_is_populated(s->dimms, 0, 0)) {
		reg16 |= (1 << 8) | (1 << 4) | (1 << 0);
	}
	if (!rank_is_populated(s->dimms, 0, 1)) {
		reg16 |= (1 << 9) | (1 << 5) | (1 << 1);
	}
	if (!rank_is_populated(s->dimms, 0, 2)) {
		reg16 |= (1 << 10) | (1 << 6) | (1 << 2);
	}
	if (!rank_is_populated(s->dimms, 0, 3)) {
		reg16 |= (1 << 11) | (1 << 7) | (1 << 3);
	}
	MCHBAR16(0x59c) = MCHBAR16(0x59c) | reg16;
}

static void sdram_rcomp(struct sysinfo *s)
{
	u8 i, j, reg8, f, rcompp, rcompn, srup, srun;
	u16 reg16;
	u32 reg32, rcomp1, rcomp2;

	u8 rcompupdate[7] = { 0, 0, 0, 1, 1, 0, 0 };
	u8 rcompslew = 0xa;
	u8 rcompstr[7] = { 0x66, 0, 0xaa, 0x55, 0x55, 0x77, 0x77 };
	u16 rcompscomp[7] = { 0xa22a, 0, 0xe22e, 0xe22e, 0xe22e, 0xa22a, 0xa22a };
	u8 rcompdelay[7] = { 1, 0, 0, 0, 0, 1, 1 };
	u16 rcompctl[7] = { 0x31c, 0, 0x374, 0x3a2, 0x3d0, 0x3fe, 0x42c };
	u16 rcompf[7] = { 0x1114, 0, 0x0505, 0x0909, 0x0909, 0x0a0a, 0x0a0a };

	//                   NC-NC   x16SS   x16DS  x16SS2  x16DS2 x8DS, x8DS2
	u8 rcompstr2[7]    = {   0x00,   0x55,   0x55,   0xaa,   0xaa , 0x55,   0xaa};
	u16 rcompscomp2[7] = { 0x0000, 0xe22e, 0xe22e, 0xe22e, 0x8228 , 0xe22e, 0x8228 };
	u8 rcompdelay2[7]  = {      0,      0,      0,      0,      2 , 0,      2};

	u8 rcomplut[64][12] = {
		{ 9, 9,11,11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 9, 9,11, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 10,9,12, 11, 2, 2, 5,5, 6, 6,5, 5},
		{ 10,9,12, 11, 2, 2, 6,5, 7, 6,6, 5},
		{ 10,10,12, 12, 2, 2, 6,5, 7, 6,6, 5},
		{ 10,10,12, 12, 2, 2, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 2, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 2, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 2, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 10,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 11,10,12, 12, 3, 3, 6,6, 7, 7,6, 6},
		{ 11,10,14, 13, 3, 3, 6,6, 7, 7,6, 6},
		{ 12,10,14, 13, 3, 3, 6,6, 7, 7,6, 6},
		{ 12,12,14, 13, 3, 3, 7,6, 7, 7,7, 6},
		{ 13,12,16, 15, 3, 3, 7,6, 8, 7,7, 6},
		{ 13,14,16, 15, 4, 3, 7,7, 8, 8,7, 7},
		{ 14,14,16, 17, 4, 3, 7,7, 8, 8,7, 7},
		{ 14,16,18, 17, 4, 4, 8,7, 8, 8,8, 7},
		{ 15,16,18, 19, 4, 4, 8,7, 9, 8,8, 7},
		{ 15,18,18, 19, 4, 4, 8,8, 9, 9,8, 8},
		{ 16,18,20, 21, 4, 4, 8,8, 9, 9,8, 8},
		{ 16,19,20, 21, 5, 4, 9,8, 10, 9,9, 8},
		{ 16,19,20, 23, 5, 5, 9,9, 10, 10,9, 9},
		{ 17,19,22, 23, 5, 5, 9,9, 10, 10,9, 9},
		{ 17,20,22, 25, 5, 5, 9,9, 10, 10,9, 9},
		{ 17,20,22, 25, 5, 5, 9,9, 10, 10,9, 9},
		{ 18,20,22, 25, 5, 5, 9,9, 10, 10,9, 9},
		{ 18,21,24, 25, 5, 5, 9,9, 11, 10,9, 9},
		{ 19,21,24, 27, 5, 5, 9, 9, 11, 11,9, 9},
		{ 19,22,24, 27, 5, 5, 10,9, 11, 11,10, 9},
		{ 20,22,24, 27, 6, 5, 10,10, 11, 11,10, 10},
		{ 20,23,26, 27, 6, 6, 10,10, 12, 12,10, 10},
		{ 20,23,26, 29, 6, 6, 10,10, 12, 12,10, 10},
		{ 21,24,26, 29, 6, 6, 10,10, 12, 12,10, 10},
		{ 21,24,26, 29, 6, 6, 11,10, 12, 13,11, 10},
		{ 22,25,28, 29, 6, 6, 11,11, 13, 13,11, 11},
		{ 22,25,28, 31, 6, 6, 11,11, 13, 13,11, 11},
		{ 22,26,28, 31, 6, 6, 11,11, 13, 14,11, 11},
		{ 23,26,30, 31, 7, 6, 12,11, 14, 14,12, 11},
		{ 23,27,30, 33, 7, 7, 12,12, 14, 14,12, 12},
		{ 23,27,30, 33, 7, 7, 12,12, 14, 15,12, 12},
		{ 24,28,32, 33, 7, 7, 12,12, 15, 15,12, 12},
		{ 24,28,32, 33, 7, 7, 12,12, 15, 16,12, 12},
		{ 24,29,32, 35, 7, 7, 12,12, 15, 16,12, 12},
		{ 25,29,32, 35, 7, 7, 12,12, 15, 17,12, 12},
		{ 25,30,32, 35, 7, 7, 12,12, 15, 17,12, 12},
		{ 25,30,32, 35, 7, 7, 12,12, 15, 17,12, 12},
	};

	srup = 0;
	srun = 0;

	if (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) {
		f = 0;
		rcomp1 = 0x00050431;
	} else {
		f = 1;
		rcomp1 = 0x00050542;
	}
	if (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) {
		rcomp2 = 0x14C42827;
	} else {
		rcomp2 = 0x19042827;
	}

	for (i = 0; i < 7; i++) {
		if (i == 1)
			continue;
		reg8 = rcompupdate[i];
		MCHBAR8(rcompctl[i]) = (MCHBAR8(rcompctl[i]) & ~0x1) | reg8;
		MCHBAR8(rcompctl[i]) = MCHBAR8(rcompctl[i]) & ~0x2;
		reg16 = (u16) rcompslew;
		MCHBAR16(rcompctl[i]) = (MCHBAR16(rcompctl[i]) & ~0xf000) |
				(reg16 << 12);
		MCHBAR8(rcompctl[i]+4) = rcompstr[i];
		MCHBAR16(rcompctl[i]+0xe) = rcompscomp[i];
		MCHBAR8(rcompctl[i]+0x14) = (MCHBAR8(rcompctl[i]+0x14) & ~0x3) |
				rcompdelay[i];
		if (i == 2) {
			reg16 = (u16) rcompslew;
			MCHBAR16(rcompctl[i]) = (MCHBAR16(rcompctl[i]) &
					~0xf000) | (reg16 << 12);
			MCHBAR8(rcompctl[i]+4) = rcompstr2[s->dimm_config[0]];
			MCHBAR16(rcompctl[i]+0xe) = rcompscomp2[s->dimm_config[0]];
			MCHBAR8(rcompctl[i]+0x14) = (MCHBAR8(rcompctl[i]+0x14) &
					~0x3) | rcompdelay2[s->dimm_config[0]];
		}

		MCHBAR16(rcompctl[i]+0x16) = MCHBAR16(rcompctl[i]+0x16) & ~0x7f7f;
		MCHBAR16(rcompctl[i]+0x18) = MCHBAR16(rcompctl[i]+0x18) & ~0x3f3f;
		MCHBAR16(rcompctl[i]+0x1a) = MCHBAR16(rcompctl[i]+0x1a) & ~0x3f3f;
		MCHBAR16(rcompctl[i]+0x1c) = MCHBAR16(rcompctl[i]+0x1c) & ~0x3f3f;
		MCHBAR16(rcompctl[i]+0x1e) = MCHBAR16(rcompctl[i]+0x1e) & ~0x3f3f;
	}

	MCHBAR8(0x45a) = (MCHBAR8(0x45a) & ~0x3f) | 0x36;
	MCHBAR8(0x462) = (MCHBAR8(0x462) & ~0x3f) | 0x36;

	for (i = 0; i < 7; i++) {
		if (i == 1)
			continue;
		MCHBAR8(rcompctl[i]) = MCHBAR8(rcompctl[i]) & ~0x60;
		MCHBAR16(rcompctl[i]+2) = MCHBAR16(rcompctl[i]+2) & ~0x706;
		MCHBAR16(rcompctl[i]+0xa) = MCHBAR16(rcompctl[i]+0xa) & ~0x7f7f;
		MCHBAR16(rcompctl[i]+0x12) = MCHBAR16(rcompctl[i]+0x12) & ~0x3f3f;
		MCHBAR16(rcompctl[i]+0x24) = MCHBAR16(rcompctl[i]+0x24) & ~0x1f1f;
		MCHBAR8(rcompctl[i]+0x26) = MCHBAR8(rcompctl[i]+0x26) & ~0x1f;
	}

	MCHBAR16(0x45a) = MCHBAR16(0x45a) & ~0xffc0;
	MCHBAR16(0x45c) = MCHBAR16(0x45c) & ~0xf;
	MCHBAR16(0x462) = MCHBAR16(0x462) & ~0xffc0;
	MCHBAR16(0x464) = MCHBAR16(0x464) & ~0xf;

	for (i = 0; i < 7; i++) {
		if (i == 1)
			continue;
		MCHBAR16(rcompctl[i]+0x10) = rcompf[i];
		MCHBAR16(rcompctl[i]+0x20) = 0x1219;
		MCHBAR16(rcompctl[i]+0x22) = 0x000C;
	}

	MCHBAR32(0x164) = (MCHBAR32(0x164) & ~0x1f1f1f) | 0x0c1219;
	MCHBAR16(0x4b0) = (MCHBAR16(0x4b0) & ~0x1f00) | 0x1200;
	MCHBAR8(0x4b0) = (MCHBAR8(0x4b0) & ~0x1f) | 0x12;
	MCHBAR32(0x138) = 0x007C9007;
	MCHBAR32(0x16c) = rcomp1;
	MCHBAR16(0x17a) = 0x1f7f;
	MCHBAR32(0x134) = rcomp2;
	MCHBAR16(0x170) = (MCHBAR16(0x170) & ~0xf) | 1;
	MCHBAR16(0x178) = 0x134;
	MCHBAR32(0x130) = 0x4C293600;
	MCHBAR8(0x133) = (MCHBAR8(0x133) & ~0x44) | (1 << 6) | (1 << 2);
	MCHBAR16(0x4b0) = MCHBAR16(0x4b0) & ~(1 << 13);
	MCHBAR8(0x4b0) = MCHBAR8(0x4b0) & ~(1 << 5);

	for (i = 0; i < 7; i++) {
		if (i == 1)
			continue;
		MCHBAR8(rcompctl[i]+2) = MCHBAR8(rcompctl[i]) & ~0x71;
	}

	if ((MCHBAR32(0x130) & (1 << 30)) == 0) {
		MCHBAR8(0x130) = MCHBAR8(0x130) | 0x1;
		while ((MCHBAR8(0x130) & 0x1) != 0);

		reg32 = MCHBAR32(0x13c);
		rcompp = (u8) ((reg32 & ~(1 << 31)) >> 24);
		rcompn = (u8) ((reg32 & ~(0xff800000)) >> 16);

		for (i = 0; i < 7; i++) {
			if (i == 1)
				continue;
			srup = (MCHBAR8(rcompctl[i]+1) & 0xc0) >> 6;
			srun = (MCHBAR8(rcompctl[i]+1) & 0x30) >> 4;
			reg16 = (u16)(rcompp - (1 << (srup + 1))) << 8;
			MCHBAR16(rcompctl[i]+0x16) = (MCHBAR16(rcompctl[i]+0x16)
							& ~0x7f00) | reg16;
			reg16 = (u16)(rcompn - (1 << (srun + 1)));
			MCHBAR8(rcompctl[i]+0x16) = (MCHBAR8(rcompctl[i]+0x16) &
							~0x7f) | (u8)reg16;
		}

		reg8 = rcompp - (1 << (srup + 1));
		for (i = 0, j = reg8; i < 4; i++, j += (1 << srup)) {
			MCHBAR8(rcompctl[0]+0x18+i) =
					(MCHBAR8(rcompctl[0]+0x18+i) & ~0x3f) |
					rcomplut[j][0];
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srup)) {
			if (s->dimm_config[0] < 3 || s->dimm_config[0] == 5) {
				MCHBAR8(rcompctl[2]+0x18+i) =
					(MCHBAR8(rcompctl[2]+0x18+i) & ~0x3f) |
					rcomplut[j][10];
			}
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srup)) {
			MCHBAR8(rcompctl[3]+0x18+i) =
					(MCHBAR8(rcompctl[3]+0x18+i) & ~0x3f) |
					rcomplut[j][6];
			MCHBAR8(rcompctl[4]+0x18+i) =
					(MCHBAR8(rcompctl[4]+0x18+i) & ~0x3f) |
					rcomplut[j][6];
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srup)) {
			MCHBAR8(rcompctl[5]+0x18+i) =
					(MCHBAR8(rcompctl[5]+0x18+i) & ~0x3f) |
					rcomplut[j][8];
			MCHBAR8(rcompctl[6]+0x18+i) =
					(MCHBAR8(rcompctl[6]+0x18+i) & ~0x3f) |
					rcomplut[j][8];
		}

		reg8 = rcompn - (1 << (srun + 1));
		for (i = 0, j = reg8; i < 4; i++, j += (1 << srun)) {
			MCHBAR8(rcompctl[0]+0x1c+i) =
					(MCHBAR8(rcompctl[0]+0x1c+i) & ~0x3f) |
					rcomplut[j][1];
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srun)) {
			if (s->dimm_config[0] < 3 || s->dimm_config[0] == 5) {
				MCHBAR8(rcompctl[2]+0x1c+i) =
					(MCHBAR8(rcompctl[2]+0x1c+i) & ~0x3f) |
					rcomplut[j][11];
			}
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srun)) {
			MCHBAR8(rcompctl[3]+0x1c+i) =
					(MCHBAR8(rcompctl[3]+0x1c+i) & ~0x3f) |
					rcomplut[j][7];
			MCHBAR8(rcompctl[4]+0x1c+i) =
					(MCHBAR8(rcompctl[4]+0x1c+i) & ~0x3f) |
					rcomplut[j][7];
		}

		for (i = 0, j = reg8; i < 4; i++, j += (1 << srun)) {
			MCHBAR8(rcompctl[5]+0x1c+i) =
					(MCHBAR8(rcompctl[5]+0x1c+i) & ~0x3f) |
					rcomplut[j][9];
			MCHBAR8(rcompctl[6]+0x1c+i) =
					(MCHBAR8(rcompctl[6]+0x1c+i) & ~0x3f) |
					rcomplut[j][9];
		}
	}
	MCHBAR8(0x130) = MCHBAR8(0x130) | 1;
}

static void sdram_odt(struct sysinfo *s)
{
	u8 rankindex = 0;

	u16 odt294[16] = {
			0x0000, 0x0000, 0x0000, 0x0000,
			0x0044, 0x1111, 0x0000, 0x1111,
			0x0000, 0x0000, 0x0000, 0x0000,
			0x0044, 0x1111, 0x0000, 0x1111
			};
	u16 odt298[16] = {
			0x0000, 0x0011, 0x0000, 0x0011,
			0x0000, 0x4444, 0x0000, 0x4444,
			0x0000, 0x0000, 0x0000, 0x0000,
			0x0000, 0x4444, 0x0000, 0x4444
			};

	switch (s->dimms[0].ranks) {
	case 0:
		if (s->dimms[1].ranks == 0) {
			rankindex = 0;
		} else if (s->dimms[1].ranks == 1) {
			rankindex = 4;
		} else if (s->dimms[1].ranks == 2) {
			rankindex = 12;
		}
		break;
	case 1:
		if (s->dimms[1].ranks == 0) {
			rankindex = 1;
		} else if (s->dimms[1].ranks == 1) {
			rankindex = 5;
		} else if (s->dimms[1].ranks == 2) {
			rankindex = 13;
		}
		break;
	case 2:
		if (s->dimms[1].ranks == 0) {
			rankindex = 3;
		} else if (s->dimms[1].ranks == 1) {
			rankindex = 7;
		} else if (s->dimms[1].ranks == 2) {
			rankindex = 15;
		}
		break;
	}

	MCHBAR16(0x298) = odt298[rankindex];
	MCHBAR16(0x294) = odt294[rankindex];
}

static void sdram_mmap(struct sysinfo *s)
{
	u32 w260[7] = {0, 0x400001, 0xc00001, 0x500000, 0xf00000, 0xc00001, 0xf00000};
	u32 w208[7] = {0, 0x10000, 0x1010000, 0x10001, 0x1010101, 0x1010000, 0x1010101};
	u32 w200[7] = {0, 0, 0, 0x20002, 0x40002, 0, 0x40002};
	u32 w204[7] = {0, 0x20002, 0x40002, 0x40004, 0x80006, 0x40002, 0x80006};

	u16 tolud[7] = {0x800, 0x800, 0x1000, 0x1000, 0x2000, 0x1000, 0x2000};
	u16 tom[7] = {0x2, 0x2, 0x4, 0x4, 0x8, 0x4, 0x8};
	u16 touud[7] = {0x80, 0x80, 0x100, 0x100, 0x200, 0x100, 0x200};
	u32 gbsm[7] = {0x8000000, 0x8000000, 0x10000000, 0x8000000, 0x20000000, 0x10000000, 0x20000000};
	u32 bgsm[7] = {0x8000000, 0x8000000, 0x10000000, 0x8000000, 0x20000000, 0x10000000, 0x20000000};
	u32 tsegmb[7] = {0x8000000, 0x8000000, 0x10000000, 0x8000000, 0x20000000, 0x10000000, 0x20000000};

	if ((s->dimm_config[0] < 3) && rank_is_populated(s->dimms, 0, 0)) {
		if (s->dimms[0].sides > 1) {
			// 2R/NC
			MCHBAR32(0x260) = (MCHBAR32(0x260) & ~0x1) | 0x300001;
			MCHBAR32(0x208) = 0x101;
			MCHBAR32(0x200) = 0x40002;
			MCHBAR32(0x204) = w204[s->dimm_config[0]];
		} else {
			// 1R/NC
			MCHBAR32(0x260) = (MCHBAR32(0x260) & ~0x1) | 0x100001;
			MCHBAR32(0x208) = 0x1;
			MCHBAR32(0x200) = 0x20002;
			MCHBAR32(0x204) = w204[s->dimm_config[0]];
		}
	} else if ((s->dimm_config[0] == 5) && rank_is_populated(s->dimms, 0, 0)) {

		MCHBAR32(0x260) = (MCHBAR32(0x260) & ~0x1) | 0x300001;
		MCHBAR32(0x208) = 0x101;
		MCHBAR32(0x200) = 0x40002;
		MCHBAR32(0x204) = 0x40004;
	} else {
		MCHBAR32(0x260) = (MCHBAR32(0x260) & ~0x1) | w260[s->dimm_config[0]];
		MCHBAR32(0x208) = w208[s->dimm_config[0]];
		MCHBAR32(0x200) = w200[s->dimm_config[0]];
		MCHBAR32(0x204) = w204[s->dimm_config[0]];
	}
	pci_write_config16(PCI_DEV(0, 0, 0), 0xb0, tolud[s->dimm_config[0]]);
	pci_write_config16(PCI_DEV(0, 0, 0), 0xa0, tom[s->dimm_config[0]]);
	pci_write_config16(PCI_DEV(0, 0, 0), 0xa2, touud[s->dimm_config[0]]);
	pci_write_config32(PCI_DEV(0, 0, 0), 0xa4, gbsm[s->dimm_config[0]]);
	pci_write_config32(PCI_DEV(0, 0, 0), 0xa8, bgsm[s->dimm_config[0]]);
	pci_write_config32(PCI_DEV(0, 0, 0), 0xac, tsegmb[s->dimm_config[0]]);
}

#if 1
static void hpet_udelay(u32 del)
{
	u32 start, finish, now;

	del *= 15; /* now in usec */

	start = HPET32(0xf0);
	finish = start + del;
	while (1) {
		now = HPET32(0xf0);
		if (finish > start) {
			if (now >= finish)
				break;
		} else {
			if ((now < start) && (now >= finish)) {
				break;
			}
		}
	}
}
#endif

static u8 sdram_checkrcompoverride(void)
{
	u32 xcomp;
	u8 aa, bb, a, b, c, d;

	xcomp = MCHBAR32(0x13c);
	a = (u8)((xcomp & 0x7f000000) >> 24);
	b = (u8)((xcomp & 0x7f0000) >> 16);
	c = (u8)((xcomp & 0x3f00) >> 8);
	d = (u8)(xcomp & 0x3f);

	if (a > b) {
		aa = a - b;
	} else {
		aa = b - a;
	}
	if (c > d) {
		bb = c - d;
	} else {
		bb = d - c;
	}
	if ((aa > 18) || (bb > 7) ||
			(a <= 5) || (b <= 5) || (c <= 5) || (d <= 5) ||
			(a >= 0x7a) || (b >= 0x7a) || (c >= 0x3a) || (d >= 0x3a)) {
		MCHBAR32(0x140) = 0x9718a729;
		return 1;
	}
	return 0;
}

static void sdram_rcompupdate(struct sysinfo *s)
{
	u8 i, ok;
	u32 reg32a, reg32b;

	ok = 0;
	MCHBAR8(0x170) = MCHBAR8(0x170) & ~(1 << 3);
	MCHBAR8(0x130) = MCHBAR8(0x130) & ~(1 << 7);
	for (i = 0; i < 3; i++) {
		MCHBAR8(0x130) = MCHBAR8(0x130) | 1;
		hpet_udelay(1000);
		while ((MCHBAR8(0x130) & 0x1) != 0);
		ok |= sdram_checkrcompoverride();
	}
	if (!ok) {
		reg32a = MCHBAR32(0x13c);
		reg32b = (reg32a >> 16) & 0x0000ffff;
		reg32a = ((reg32a << 16) & 0xffff0000) | reg32b;
		reg32a |= (1 << 31) | (1 << 15);
		MCHBAR32(0x140) = reg32a;
	}
	MCHBAR8(0x130) = MCHBAR8(0x130) | 1;
	hpet_udelay(1000);
	while ((MCHBAR8(0x130) & 0x1) != 0);
}

static void __attribute__((noinline))
sdram_jedec(struct sysinfo *s, u8 rank, u8 jmode, u16 jval)
{
	u32 reg32;

	reg32 = jval << 3;
	reg32 |= rank * 0x8000000;
	MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0x3e) | jmode;
	read32((void *)reg32);
	barrier();
	hpet_udelay(1); // 1us
}

static void sdram_zqcl(struct sysinfo *s)
{
	if (s->boot_path == BOOT_PATH_RESUME) {
		MCHBAR32(0x260) = MCHBAR32(0x260) | (1 << 27);
		MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0xe) | NORMAL_OP_CMD;
		MCHBAR8(0x271) = MCHBAR8(0x271) & ~0x30;
		MCHBAR32(0x268) = (MCHBAR32(0x268) & ~((1 << 30) | (1 << 31))) |
				(1 << 30) | (1 << 31);
	}
}

static void sdram_jedecinit(struct sysinfo *s)
{
	u8 r, i, ch;
	u16 reg16, mrs, rttnom;
	struct jedeclist {
		char debug[15];
		u8 cmd;
		u16 val;
	};

	struct jedeclist jedec[12] = {
			{ "   NOP        ", NOP_CMD, 0 },
			{ "   PRE CHARGE ", PRE_CHARGE_CMD, 0 },
			{ "   EMRS2      ", EMRS2_CMD, 0 },
			{ "   EMRS3      ", EMRS3_CMD, 0 },
			{ "   EMRS1      ", EMRS1_CMD, 0 },
			{ "   DLL RESET  ", MRS_CMD, (1 << 8) },
			{ "   PRE CHARGE ", PRE_CHARGE_CMD, 0 },
			{ "   AUTOREFRESH", CBR_CMD, 0 },
			{ "   AUTOREFRESH", CBR_CMD, 0 },
			{ "   INITIALISE ", MRS_CMD, 0 },
			{ "   EMRS1 OCD  ", EMRS1_CMD, (1 << 9) | (1 << 8) | (1 << 7) },
			{ "   EMRS1 EXIT ", EMRS1_CMD, 0 }
	};

	mrs = (s->selected_timings.CAS << 4) |
		((s->selected_timings.tWR - 1) << 9) | (1 << 3) | (1 << 1) | 1;
	rttnom = (1 << 2);
	if (rank_is_populated(s->dimms, 0, 0) && rank_is_populated(s->dimms, 0, 2)) {
		rttnom |= (1 << 6);
	}

	hpet_udelay(200); // 200us
	reg16 = 0;
	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
		for (i = 0; i < 12; i++) {
			PRINTK_DEBUG("Rank:%d Jedec:%14s...", r, jedec[i].debug);
			reg16 = jedec[i].val;
			switch (jedec[i].cmd) {
			case EMRS1_CMD:
				reg16 |= rttnom;
				break;
			case MRS_CMD:
				reg16 |= mrs;
				break;
			default:
				break;
			}
			sdram_jedec(s, r, jedec[i].cmd, reg16);
			PRINTK_DEBUG("done\n");
		}
	}
}

static void sdram_misc(struct sysinfo *s)
{
	u32 reg32;

	reg32 = 0;
	reg32 |= (0x4 << 13);
	reg32 |= (0x6 << 8);
	MCHBAR32(0x274) = (MCHBAR32(0x274) & ~0x3ff00) | reg32;
	MCHBAR8(0x274) = MCHBAR8(0x274) & ~(1 << 7);
	MCHBAR8(0x26c) = MCHBAR8(0x26c) | 1;
	if (s->boot_path != BOOT_PATH_RESUME) {
		MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0xe) | NORMAL_OP_CMD;
		MCHBAR8(0x271) = MCHBAR8(0x271) & ~0x30;
	} else {
		sdram_zqcl(s);
	}
}

static void sdram_checkreset(void)
{
	u8 pmcon2, pmcon3, reset;

	pmcon2 = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xa2);
	pmcon3 = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xa4);
	pmcon3 &= ~0x2;
	if (pmcon2 & 0x80) {
		pmcon2 &= ~0x80;
		reset = 1;
	} else {
		pmcon2 |= 0x80;
		reset = 0;
	}
	if (pmcon2 & 0x4) {
		pmcon2 |= 0x4;
		pmcon3 = (pmcon3 & ~0x30) | 0x30;
		pmcon3 |= (1 << 3);
	}
	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa2, pmcon2);
	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa4, pmcon3);
	if (reset) {
		printk(BIOS_DEBUG, "Power cycle reset...\n");
		outb(0xe, 0xcf9);
	}
}

static void sdram_dradrb(struct sysinfo *s)
{
	u8 i, reg8, ch, r;
	u32 reg32, ind, c0dra, c0drb, dra;
	u16 addr;
	i = 0;
	u8 dratab[2][2][2][4] =
	{{
		{
		 {0xff, 0xff, 0xff, 0xff},
		 {0xff, 0x00, 0x02, 0xff}
		},
		{
		 {0xff, 0x01, 0xff, 0xff},
		 {0xff, 0x03, 0xff, 0x06}
		}
	},
	{
		{
		 {0xff, 0xff, 0xff, 0xff},
		 {0xff, 0x04, 0x06, 0x08}
		},
		{
		 {0xff, 0xff, 0xff, 0xff},
		 {0x05, 0x07, 0x09, 0xff}
		}
	}};

	u8 dradrb[10][6]  =  {
		//Row   Col   Bank  Width         DRB
		{0x01,  0x01,  0x00,  0x08,  0,  0x04},
		{0x01,  0x00,  0x00,  0x10,  0,  0x02},
		{0x02,  0x01,  0x00,  0x08,  1,  0x08},
		{0x01,  0x01,  0x00,  0x10,  1,  0x04},
		{0x01,  0x01,  0x01,  0x08,  1,  0x08},
		{0x00,  0x01,  0x01,  0x10,  1,  0x04},
		{0x02,  0x01,  0x01,  0x08,  2,  0x10},
		{0x01,  0x01,  0x01,  0x10,  2,  0x08},
		{0x03,  0x01,  0x01,  0x08,  3,  0x20},
		{0x02,  0x01,  0x01,  0x10,  3,  0x10},
	};

	reg32 = 0;
	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
		i = r / 2;
		PRINTK_DEBUG("RANK %d PRESENT\n", r);
		dra = dratab[s->dimms[i].banks]
			[s->dimms[i].width]
			[s->dimms[i].cols - 9]
			[s->dimms[i].rows - 12];

		if (s->dimms[i].banks == 1) {
			dra |= (1 << 7);
		}
		reg32 |= (dra << (r*8));
	}
	MCHBAR32(0x208) = reg32;
	c0dra = reg32;
	PRINTK_DEBUG("C0DRA = 0x%08x\n", c0dra);

	reg32 = 0;
	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
		reg32 |= (1 << r);
	}
	reg8 = (u8)(reg32 << 4) & 0xf0;
	MCHBAR8(0x262) = (MCHBAR8(0x262) & ~0xf0) | reg8;
	if (ONLY_DIMMA_IS_POPULATED(s->dimms, 0) ||
			ONLY_DIMMB_IS_POPULATED(s->dimms, 0)) {
		MCHBAR8(0x260) = MCHBAR8(0x260) | 1;
	}

	addr = 0x200;
	c0drb = 0;
	FOR_EACH_RANK(ch, r) {
		if (rank_is_populated(s->dimms, ch, r)) {
			ind = (c0dra >> (8*r)) & 0x7f;
			c0drb = (u16)(c0drb + dradrb[ind][5]);
			s->channel_capacity[0] += dradrb[ind][5] << 6;
		}
		MCHBAR16(addr) = c0drb;
		addr += 2;
	}
	printk(BIOS_DEBUG, "Total memory = %dMB\n", s->channel_capacity[0]);
}

static u8 sampledqs(u32 dqshighaddr, u32 strobeaddr, u8 highlow, u8 count)
{
	volatile u32 strobedata;
	u8 dqsmatches = 1;
	while (count--) {
		MCHBAR8(0x5d8) = MCHBAR8(0x5d8) & ~0x2;
		hpet_udelay(1);
		MCHBAR8(0x5d8) = MCHBAR8(0x5d8) | 0x2;
		hpet_udelay(1);
		barrier();
		strobedata = read32((void*)strobeaddr);
		barrier();
		hpet_udelay(1);

		if (((MCHBAR8(dqshighaddr) & 0x40) >> 6) != highlow) {
			dqsmatches = 0;
		}
	}

	return dqsmatches;
}

static void rcvenclock(u8 *coarse, u8 *medium, u8 bytelane)
{
	if (*medium < 3) {
		(*medium)++;
		MCHBAR16(0x58c) = (MCHBAR16(0x58c) & (u16)(~(0x3 << (bytelane*2))))
					| (*medium << (bytelane*2));
	} else {
		*medium = 0;
		(*coarse)++;
		MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000) | (*coarse << 16);
		MCHBAR16(0x58c) = (MCHBAR16(0x58c) & (u16)(~0x3 << (bytelane*2)))
					| (*medium << (bytelane*2));
	}
}

static void sdram_rcven(struct sysinfo *s)
{
	u8 curcoarse, savecoarse;
	u8 curmedium, savemedium;
	u8 pi, savepi;
	u8 bytelane;
	u8 bytelanecoarse[8] = { 0 };
	u8 minbytelanecoarse = 0xff;
	u8 bytelaneoffset;
	u8 maxbytelane = 8;
	u32 strobeaddr = (rank_is_populated(s->dimms, 0, 0)) ? 0 : 2*128*1024*1024;
	u32 dqshighaddr;

	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) & ~0xc;
	MCHBAR8(0x5dc) = MCHBAR8(0x5dc) & ~0x80;

	PRINTK_DEBUG("rcven 0\n");
	for (bytelane = 0; bytelane < maxbytelane; bytelane++) {
		PRINTK_DEBUG("rcven bytelane %d\n", bytelane);
//trylaneagain:
		dqshighaddr = 0x561 + (bytelane << 2);

		curcoarse = s->selected_timings.CAS + 1;
		pi = 0;
		curmedium = 0;

		MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000) | (curcoarse << 16);
		MCHBAR16(0x58c) = (MCHBAR16(0x58c) & (u16)(~(0x3 << (bytelane*2))))
						| (curmedium << (bytelane*2));
		MCHBAR8(0x560+bytelane*4) = MCHBAR8(0x560+bytelane*4) & ~0x3f;

		savecoarse = curcoarse;
		savemedium = curmedium;
		savepi = pi;

		PRINTK_DEBUG("rcven 0.1\n");

		//MCHBAR16(0x588) = (MCHBAR16(0x588) & (u16)~(0x3 << (bytelane*2))) | (1 << (bytelane*2)); // XXX comment out

		while (sampledqs(dqshighaddr, strobeaddr, 0, 3) == 0) {
			//printk(BIOS_DEBUG, "coarse=%d medium=%d\n", curcoarse, curmedium);
			rcvenclock(&curcoarse, &curmedium, bytelane);
			if (curcoarse > 0xf) {
				PRINTK_DEBUG("Error: coarse > 0xf\n");
				//goto trylaneagain;
				break;
			}
		}
		PRINTK_DEBUG("rcven 0.2\n");

		savecoarse = curcoarse;
		savemedium = curmedium;
		rcvenclock(&curcoarse, &curmedium, bytelane);

		while (sampledqs(dqshighaddr, strobeaddr, 1, 3) == 0) {
			savecoarse = curcoarse;
			savemedium = curmedium;
			rcvenclock(&curcoarse, &curmedium, bytelane);
			if (curcoarse > 0xf) {
				PRINTK_DEBUG("Error: coarse > 0xf\n");
				//goto trylaneagain;
				break;
			}
		}

		PRINTK_DEBUG("rcven 0.3\n");
		curcoarse = savecoarse;
		curmedium = savemedium;
		MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000) | (curcoarse << 16);
		MCHBAR16(0x58c) = (MCHBAR16(0x58c) & (u16)(~(0x3 << bytelane*2)))
						| (curmedium << (bytelane*2));

		while (sampledqs(dqshighaddr, strobeaddr, 1, 3) == 0) {
			savepi = pi;
			pi++;
			if (pi > s->maxpi) {
				//if (s->nodll) {
					pi = savepi = s->maxpi;
					break;
				//}
			}
			MCHBAR8(0x560 + bytelane*4) = (MCHBAR8(0x560 + bytelane*4)
					& ~0x3f) | (pi << s->pioffset);
		}
		PRINTK_DEBUG("rcven 0.4\n");

		pi = savepi;
		MCHBAR8(0x560 + bytelane*4) = (MCHBAR8(0x560 + bytelane*4) & ~0x3f)
						| (pi << s->pioffset);
		rcvenclock(&curcoarse, &curmedium, bytelane);
		if (sampledqs(dqshighaddr, strobeaddr, 1, 1) == 0) {
			PRINTK_DEBUG("Error: DQS not high\n");
			//goto trylaneagain;
		}
		PRINTK_DEBUG("rcven 0.5\n");
		while (sampledqs(dqshighaddr, strobeaddr, 0, 3) == 0) {
			curcoarse--;
			MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000)
						| (curcoarse << 16);
			if (curcoarse == 0) {
				PRINTK_DEBUG("Error: DQS didnt hit 0\n");
				break;
			}
		}

		PRINTK_DEBUG("rcven 0.6\n");
		rcvenclock(&curcoarse, &curmedium, bytelane);
		s->pi[bytelane] = pi;
		bytelanecoarse[bytelane] = curcoarse;
	}

	PRINTK_DEBUG("rcven 1\n");

	bytelane = maxbytelane;
	do {
		bytelane--;
		if (minbytelanecoarse > bytelanecoarse[bytelane]) {
			minbytelanecoarse = bytelanecoarse[bytelane];
		}
	} while (bytelane != 0);

	bytelane = maxbytelane;
	do {
		bytelane--;
		bytelaneoffset = bytelanecoarse[bytelane] - minbytelanecoarse;
		MCHBAR16(0x5fa) = (MCHBAR16(0x5fa) & (u16)(~(0x3 << (bytelane*2))))
					| (bytelaneoffset << (bytelane*2));
	} while (bytelane != 0);

	MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0xf0000) | (minbytelanecoarse << 16);

	s->coarsectrl = minbytelanecoarse;
	s->coarsedelay = MCHBAR16(0x5fa);
	s->mediumphase = MCHBAR16(0x58c);
	s->readptrdelay = MCHBAR16(0x588);

	PRINTK_DEBUG("rcven 2\n");
	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) & ~0xe;
	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) | 0x2;
	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) | 0x4;
	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) | 0x8;

	MCHBAR8(0x5dc) = MCHBAR8(0x5dc) | 0x80;
	MCHBAR8(0x5dc) = MCHBAR8(0x5dc) & ~0x80;
	MCHBAR8(0x5dc) = MCHBAR8(0x5dc) | 0x80;
	PRINTK_DEBUG("rcven 3\n");
}

static void sdram_mmap_regs(struct sysinfo *s)
{
	bool reclaim;
	u32 tsegsize;
	u32 mmiosize;
	u32 tom, tolud, touud, reclaimbase, reclaimlimit;
	u32 gfxbase, gfxsize, gttbase, gttsize, tsegbase;
	u16 ggc;
	u16 ggc_to_uma[10] = { 0, 1, 4, 8, 16, 32, 48, 64, 128, 256 };
	u8 ggc_to_gtt[4] = { 0, 1, 0, 0 };

	reclaimbase = 0;
	reclaimlimit = 0;
	ggc = pci_read_config16(PCI_DEV(0,0,0), GGC);
	printk(BIOS_DEBUG, "GGC = 0x%04x\n", ggc);
	gfxsize = ggc_to_uma[(ggc & 0xf0) >> 4];
	gttsize = ggc_to_gtt[(ggc & 0x300) >> 8];
	tom = s->channel_capacity[0];

	tsegsize = 0x1; // 1MB
	mmiosize = 0x400; // 1GB

	reclaim = false;
	tolud = MIN(0x1000 - mmiosize, tom);
	if ((tom - tolud) > 0x40) {
	//	reclaim = true;
	}
	if (reclaim) {
		tolud = tolud & ~0x3f;
		tom = tom & ~0x3f;
		reclaimbase = MAX(0x1000, tom);
		reclaimlimit = reclaimbase + (MIN(0x1000, tom) - tolud) - 0x40;
	}
	touud = tom;
	if (reclaim) {
		touud = reclaimlimit + 0x40;
	}

	gfxbase = tolud - gfxsize;
	gttbase = gfxbase - gttsize;
	tsegbase = gttbase - tsegsize;

	/* Program the regs */
	pci_write_config16(PCI_DEV(0,0,0), TOLUD, (u16)(tolud << 4));
	pci_write_config16(PCI_DEV(0,0,0), TOM, (u16)(tom >> 6));
	if (reclaim) {
		pci_write_config16(PCI_DEV(0,0,0), 0x98, (u16)(reclaimbase >> 6));
		pci_write_config16(PCI_DEV(0,0,0), 0x9a, (u16)(reclaimlimit >> 6));
	}
	pci_write_config16(PCI_DEV(0,0,0), TOUUD, (u16)(touud));
	pci_write_config32(PCI_DEV(0,0,0), GBSM, gfxbase << 20);
	pci_write_config32(PCI_DEV(0,0,0), BGSM, gttbase << 20);
	pci_write_config32(PCI_DEV(0,0,0), TSEG, tsegbase << 20);

	printk(BIOS_DEBUG, "GBSM (igd) = verified %08x (written %08x)\n",
		pci_read_config32(PCI_DEV(0,0,0), GBSM), gfxbase << 20);
	printk(BIOS_DEBUG, "BGSM (gtt) = verified %08x (written %08x)\n",
		pci_read_config32(PCI_DEV(0,0,0), BGSM), gttbase << 20);
	printk(BIOS_DEBUG, "TSEG (smm) = verified %08x (written %08x)\n",
		pci_read_config32(PCI_DEV(0,0,0), TSEG), tsegbase << 20);
}

static void sdram_enhancedmode(struct sysinfo *s)
{
	u8 reg8, ch, r, j, i;
	u32 mask32, reg32;
	MCHBAR8(0x246) = MCHBAR8(0x246) | 1;
	MCHBAR8(0x269 + 3) = MCHBAR8(0x269 + 3) | 1;
	mask32 = (0x1f << 15) | (0x1f << 10) | (0x1f << 5) | 0x1f;
	reg32 = (0x1e << 15) | (0x10 << 10) | (0x1e << 5) | 0x10;
	MCHBAR32(0x120) = (MCHBAR32(0x120) & ~mask32) | reg32;
	MCHBAR8(0x288 + 1) = 0x2;
	MCHBAR16(0x288 + 2) = 0x0804;
	MCHBAR16(0x288 + 4) = 0x2010;
	MCHBAR8(0x288 + 6) = 0x40;
	MCHBAR16(0x288 + 8) = 0x091c;
	MCHBAR8(0x288 + 10) = 0xf2;
	MCHBAR8(0x241) = MCHBAR8(0x241) | 1;
	MCHBAR8(0x243) = MCHBAR8(0x243) | 1;
	MCHBAR16(0x272) = MCHBAR16(0x272) | 0x100;

	reg8 = pci_read_config8(PCI_DEV(0,0,0), 0xf0);
	pci_write_config8(PCI_DEV(0,0,0), 0xf0, reg8 | 1);
	MCHBAR32(0xfa0) = 0x00000002;
	MCHBAR32(0xfa4) = 0x20310002;
	MCHBAR32(0x24) = 0x02020302;
	MCHBAR32(0x30) = 0x001f1806;
	MCHBAR32(0x34) = 0x01102800;
	MCHBAR32(0x38) = 0x07000000;
	MCHBAR32(0x3c) = 0x01014010;
	MCHBAR32(0x40) = 0x0f038000;
	reg8 = pci_read_config8(PCI_DEV(0,0,0), 0xf0);
	pci_write_config8(PCI_DEV(0,0,0), 0xf0, reg8 & ~1);

	u32 nranks, curranksize, maxranksize, maxdra, dra;
	u8 rankmismatch, dramismatch;
	u8 drbtab[10] = { 0x4, 0x2, 0x8, 0x4, 0x8, 0x4, 0x10, 0x8, 0x20, 0x10 };

	nranks = 0;
	curranksize = 0;
	maxranksize = 0;
	maxdra = 0;
	rankmismatch = 0;
	dramismatch = 0;
	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
		nranks++;
		dra = (u8) ((MCHBAR32(0x208) >> (8*r)) & 0x7f);
		curranksize = drbtab[dra];
		if (maxranksize == 0) {
			maxranksize = curranksize;
			maxdra = dra;
		}
		if (curranksize != maxranksize) {
			rankmismatch = 1;
		}
		if (dra != maxdra) {
			dramismatch = 1;
		}
	}

	reg8 = 0;
	switch (nranks) {
	case 4:
		if (rankmismatch) {
			reg8 = 0x64;
		} else {
			reg8 = 0xa4;
		}
		break;
	case 1:
	case 3:
		reg8 = 0x64;
		break;
	case 2:
		if (rankmismatch) {
			reg8 = 0x64;
		} else {
			reg8 = 0x24;
		}
		break;
	default:
		die("Invalid number of ranks found, halt\n");
		break;
	}
	MCHBAR8(0x111) = (MCHBAR8(0x111) & ~0xfc) | (reg8 & 0xfc);
	MCHBAR32(0xd0) = MCHBAR32(0xd0) & ~0x80000000;

	MCHBAR32(0x28) = 0xf;
	MCHBAR8(0x2c4) = MCHBAR8(0x2c4) | 1;

	MCHBAR32(0x3c) = MCHBAR32(0x3c) & ~0xe000000;
	MCHBAR32(0x40) = (MCHBAR32(0x40) & ~0xc0000) | 0x40000;
	u32 clkcx[2][2][3] = {
				{
					{0, 0x0c080302, 0x08010204},	// 667
					{0x02040000, 0x08100102, 0}
				},
				{
					{0x18000000, 0x3021060c, 0x20010208},
					{0, 0x0c090306, 0}		// 800
				}
			};
	j = s->selected_timings.fsb_clock;
	i = s->selected_timings.mem_clock;

	MCHBAR32(0x708) = clkcx[j][i][0];
	MCHBAR32(0x70c) = clkcx[j][i][1];
	MCHBAR32(0x6dc) = clkcx[j][i][2];
	MCHBAR8(0x40) = MCHBAR8(0x40) & ~0x2;
}

static void sdram_periodic_rcomp(void)
{
	MCHBAR8(0x130) = MCHBAR8(0x130) & ~0x2;
	while ((MCHBAR32(0x130) & 0x80000000) > 0) {
		;
	}
	MCHBAR16(0x1b4) = (MCHBAR16(0x1b4) & ~0x3000);

	MCHBAR8(0x5dc) = MCHBAR8(0x5dc) | 0x80;
	MCHBAR16(0x170) = (MCHBAR16(0x170) & ~0xf) | 0x9;

	MCHBAR8(0x130) = MCHBAR8(0x130) | 0x82;
}

static void sdram_new_trd(struct sysinfo *s)
{
	u8 pidelay, i, j, k, cc, trd_perphase[5];
	u8 bypass, freqgb, trd, reg8, txfifo, cas;
	u32 reg32, datadelay, tio, rcvendelay, maxrcvendelay;
	u16 tmclk, thclk, buffertocore, postcalib;
	u8 txfifo_lut[8] = { 0, 7, 6, 5, 2, 1, 4, 3 };
	u16 trd_adjust[2][2][5] = {
			{
				{3000, 3000, 0,0,0},
				{1000,2000,3000,1500,2500}
			},
			{
				{2000,1000,3000,0,0},
				{2500, 2500, 0,0,0}
			}};

	freqgb = 110;
	buffertocore = 5000;
	cas = s->selected_timings.CAS;
	postcalib = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 1250 : 500;
	tmclk = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 3000 : 2500;
	tmclk = tmclk * 100 / freqgb;
	thclk = (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) ? 6000 : 5000;
	switch (s->selected_timings.mem_clock) {
	case MEM_CLOCK_667MHz:
		if (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) {
			cc = 2;
		} else {
			cc = 3;
		}
		break;
	default:
	case MEM_CLOCK_800MHz:
		if (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) {
			cc = 5;
		} else {
			cc = 2;
		}
		break;
	}
	tio = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 2700 : 3240;
	maxrcvendelay = 0;
	pidelay = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 24 : 20;

	for (i = 0; i < 8; i++) {
		rcvendelay = ((u32)((s->coarsedelay >> (i << 1)) & 0x3) * (u32)(tmclk));
		rcvendelay += ((u32)((s->readptrdelay >> (i << 1)) & 0x3) * (u32)(tmclk) / 2);
		rcvendelay += ((u32)((s->mediumphase >> (i << 1)) & 0x3) * (u32)(tmclk) / 4);
		rcvendelay += (u32)(pidelay * s->pi[i]);
		maxrcvendelay = MAX(maxrcvendelay, rcvendelay);
	}

	if ((MCHBAR8(0xc54+3) == 0xff) && (MCHBAR8(0xc08) & 0x80)) {
		bypass = 1;
	} else {
		bypass = 0;
	}

	txfifo = 0;
	reg8 = (MCHBAR8(0x188) & 0xe) >> 1;
	txfifo = txfifo_lut[reg8] & 0x7;

	datadelay = tmclk * (2*txfifo + 4*s->coarsectrl + 4*(bypass-1) + 13) / 4
			+ tio + maxrcvendelay + pidelay + buffertocore + postcalib;
	if (s->async) {
		datadelay += tmclk / 2;
	}

	j = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 0 : 1;
	k = (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) ? 0 : 1;

	if (j == 0 && k == 0) {
		datadelay -= 3084;
	}

	trd = 0;
	for (i = 0; i < cc; i++) {
		reg32 = datadelay - (trd_adjust[k][j][i] * 100 / freqgb);
		trd_perphase[i] = (u8)(reg32 / thclk) - 2;
		trd_perphase[i] += 1;
		if (trd_perphase[i] > trd) {
			trd = trd_perphase[i];
		}
	}

	MCHBAR16(0x248) = (MCHBAR16(0x248) & ~0x1f00) | (trd << 8);
}

static void sdram_powersettings(struct sysinfo *s)
{
	u8 j;
	u32 reg32;

	/* Thermal sensor */
	MCHBAR8(0x3808) = 0x9b;
	MCHBAR32(0x380c) = (MCHBAR32(0x380c) & ~0x00ffffff) | 0x1d00;
	MCHBAR8(0x3814) = 0x08;
	MCHBAR8(0x3824) = 0x00;
	MCHBAR8(0x3809) = (MCHBAR8(0x3809) & ~0xf) | 0x4;
	MCHBAR8(0x3814) = (MCHBAR8(0x3814) & ~1) | 1;
	MCHBAR8(0x3812) = (MCHBAR8(0x3812) & ~0x80) | 0x80;

	/* Clock gating */
	MCHBAR32(0xf18) = MCHBAR32(0xf18) & ~0x00040001;
	MCHBAR8(0xfac+3) = MCHBAR8(0xfac+3) & ~0x80;
	MCHBAR8(0xff8+3) = MCHBAR8(0xff8+3) & ~0x80;
	MCHBAR16(0xff0) = MCHBAR16(0xff0) & ~0x1fff;
	MCHBAR32(0xfb0) = MCHBAR32(0xfb0) & ~0x0001ffff;
	MCHBAR16(0x48) = (MCHBAR16(0x48) & ~0x03ff) & 0x6;
	MCHBAR32(0x20) = (MCHBAR32(0x20) & ~0xffffffff) | 0x20;
	MCHBAR8(0xd14) = MCHBAR8(0xd14) & ~1;
	MCHBAR8(0x239) = s->selected_timings.CAS - 1 + 0x15;
	MCHBAR16(0x2d1) = (MCHBAR16(0x2d1) & ~0x07fc) | 0x40;
	MCHBAR16(0x6d1) = (MCHBAR16(0x6d1) & ~0x0fff) | 0xd00;
	MCHBAR16(0x210) = MCHBAR16(0x210) & ~0x0d80;
	MCHBAR16(0xf6c+2) = 0xffff;

	/* Sequencing */
	MCHBAR32(0x14) = (MCHBAR32(0x14) & ~0x1fffffff) | 0x1f643fff;
	MCHBAR32(0x18) = (MCHBAR32(0x18) & ~0xffffff7f) | 0x02010000;
	MCHBAR16(0x1c) = (MCHBAR16(0x1c) & ~0x7000) | (0x3 << 12);

	/* Power */
	MCHBAR32(0x1104) = (MCHBAR32(0x1104) & ~0xffff0003) | 0x10100000;
	MCHBAR32(0x1108) = (MCHBAR32(0x1108) & ~0x0001bff7) | 0x00000078;
	if (s->selected_timings.fsb_clock == FSB_CLOCK_667MHz) {
		MCHBAR16(0x110c) = (MCHBAR16(0x110c) & ~0x03ff) | 0xc8;
	} else {
		MCHBAR16(0x110c) = (MCHBAR16(0x110c) & ~0x03ff) | 0x100;
	}
	j = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 0 : 1;

	MCHBAR32(0x1110) = (MCHBAR32(0x1110) & ~0x1fff37f) | 0x10810700;
	MCHBAR8(0x1114) = (MCHBAR8(0x1114) & ~0x07) | 1;
	MCHBAR8(0x1124) = MCHBAR8(0x1124) & ~0x02;

	u16 ddr2lut[2][4][2] = {{
					{0x0000,  0x0000},
					{0x019A,  0x0039},
					{0x0099,  0x1049},
					{0x0000,  0x0000}
				},
				{
					{0x0000,  0x0000},
					{0x019A,  0x0039},
					{0x0099,  0x1049},
					{0x0099,  0x2159}
				}};

	MCHBAR16(0x23c) = 0x7a89;
	MCHBAR8(0x117) = 0xaa;
	MCHBAR16(0x118) = ddr2lut[j][s->selected_timings.CAS - 3][1];
	MCHBAR16(0x115) = (MCHBAR16(0x115) & ~0x7fff) | ddr2lut[j]
		[s->selected_timings.CAS - 3][0];
	MCHBAR16(0x210) = (MCHBAR16(0x210) & ~0xf000) | 0xf000;
	MCHBAR8(0x2c02) = (MCHBAR8(0x2c02) & ~0x77) | (4 << 4 | 4);
	if (s->nodll) {
		reg32 = 0x30000000;
	} else {
		reg32 = 0;
	}
	MCHBAR32(0x2c0) = (MCHBAR32(0x2c0) & ~0x0f000000) | 0x20000000 | reg32;
	MCHBAR32(0x2d1) = (MCHBAR32(0x2d1) & ~0x00f00000) | 0x00f00000;
	MCHBAR32(0x6d0) = (MCHBAR32(0x6d0) & ~0x001ff000) | (0xbf << 20);
	MCHBAR16(0x610) = (MCHBAR16(0x610) & ~0x1f7f) | (0xb << 8) | (7 << 4) | 0xb;
	MCHBAR16(0x612) = 0x3264;
	MCHBAR16(0x614) = (MCHBAR16(0x614) & ~0x3f3f) | (0x14 << 8) | 0xa;

	MCHBAR32(0x6c0) = MCHBAR32(0x6c0) | 0x80002000;
}

static void sdram_programddr(void)
{
	MCHBAR16(0x6d1) = (MCHBAR16(0x6d1) & ~0x03ff) | 0x100;
	MCHBAR16(0x210) = (MCHBAR16(0x210) & ~0x003f) | 0x10;
	MCHBAR16(0x2d1) = (MCHBAR16(0x2d1) & ~0x7000) | 0x2000;
	MCHBAR8(0x180) = MCHBAR8(0x180) & ~0xe;
	MCHBAR8(0x18c) = MCHBAR8(0x18c) & ~0xc;
	MCHBAR8(0x561) = MCHBAR8(0x561) & ~0xe;
	MCHBAR8(0x565) = MCHBAR8(0x565) & ~0xe;
	MCHBAR8(0x569) = MCHBAR8(0x569) & ~0xe;
	MCHBAR8(0x56d) = MCHBAR8(0x56d) & ~0xe;
	MCHBAR8(0x571) = MCHBAR8(0x571) & ~0xe;
	MCHBAR8(0x575) = MCHBAR8(0x575) & ~0xe;
	MCHBAR8(0x579) = MCHBAR8(0x579) & ~0xe;
	MCHBAR8(0x57d) = MCHBAR8(0x57d) & ~0xe;
	MCHBAR8(0x18c) = MCHBAR8(0x18c) & ~0x2;
	MCHBAR16(0x1b4) = MCHBAR16(0x1b4) & ~0x400;
	MCHBAR16(0x210) = MCHBAR16(0x210) & ~0xdc0;
	MCHBAR8(0x239) = MCHBAR8(0x239) & ~0x80;
	MCHBAR32(0x2c0) = MCHBAR32(0x2c0) & ~(1 << 22);
	MCHBAR16(0x2d1) = MCHBAR16(0x2d1) & ~0x80fc;
	MCHBAR16(0x6d1) = MCHBAR16(0x6d1) & ~0xc00;
	MCHBAR8(0x180) = MCHBAR8(0x180) & ~0xd;
	MCHBAR8(0x561) = MCHBAR8(0x561) & ~1;
	MCHBAR8(0x565) = MCHBAR8(0x565) & ~1;
	MCHBAR8(0x569) = MCHBAR8(0x569) & ~1;
	MCHBAR8(0x56d) = MCHBAR8(0x56d) & ~1;
	MCHBAR8(0x571) = MCHBAR8(0x571) & ~1;
	MCHBAR8(0x575) = MCHBAR8(0x575) & ~1;
	MCHBAR8(0x579) = MCHBAR8(0x579) & ~1;
	MCHBAR8(0x57d) = MCHBAR8(0x57d) & ~1;
	MCHBAR32(0x248) = (MCHBAR32(0x248) & ~0x700000) | (0x3 << 20);
	MCHBAR32(0x2c0) = MCHBAR32(0x2c0) & ~0x100000;
	MCHBAR8(0x592) = MCHBAR8(0x592) | 0x1e;
	MCHBAR8(0x2c15) = MCHBAR8(0x2c15) | 0x3;
	MCHBAR32(0x62c) = (MCHBAR32(0x62c) & ~0xc000000) | 0x4000000;
	MCHBAR16(0x248) = MCHBAR16(0x248) | 0x6000;
	MCHBAR32(0x260) = MCHBAR32(0x260) | 0x10000;
	MCHBAR8(0x2c0) = MCHBAR8(0x2c0) | 0x10;
	MCHBAR32(0x2d0) = MCHBAR32(0x2d0) | (0xf << 24);
	MCHBAR8(0x189) = MCHBAR8(0x189) | 0x7;
	MCHBAR8(0x592) = MCHBAR8(0x592) | 0xc0;
	MCHBAR8(0x124) = MCHBAR8(0x124) | 0x7;
	MCHBAR16(0x12a) = (MCHBAR16(0x12a) & ~0xffff) | 0x0080;
	MCHBAR8(0x12c) = (MCHBAR8(0x12c) & ~0xff) | 0x10;
	MCHBAR16(0x2c0) = MCHBAR16(0x2c0) | 0x1e0;
	MCHBAR8(0x189) = MCHBAR8(0x189) | 0x18;
	MCHBAR8(0x193) = MCHBAR8(0x193) | 0xd;
	MCHBAR16(0x212) = MCHBAR16(0x212) | 0xa3f;
	MCHBAR8(0x248) = MCHBAR8(0x248) | 0x3;
	MCHBAR8(0x268) = (MCHBAR8(0x268) & ~0xff) | 0x4a;
	MCHBAR8(0x2c4) = MCHBAR8(0x2c4) & ~0x60;
	MCHBAR16(0x592) = MCHBAR16(0x592) | 0x321;
}

static void sdram_programdqdqs(struct sysinfo *s)
{
	u16 mdclk, tpi, refclk, dqdqs_out, dqdqs_outdelay, dqdqs_delay;
	u32 coretomcp, txdelay, tmaxunmask, tmaxpi;
	u8 repeat, halfclk, feature, reg8, push;
	u16 cwb, pimdclk;
	u32 reg32;
	u8 txfifotab[8] = { 0, 7, 6, 5, 2, 1, 4, 3 };

	tpi = 3000;
	dqdqs_out = 4382;
	dqdqs_outdelay = 5083;
	dqdqs_delay = 4692;
	coretomcp = 0;
	txdelay = 0;
	halfclk = 0;
	tmaxunmask = 0;
	tmaxpi = 0;
	repeat = 2;
	feature = 0;
	cwb = 0;
	pimdclk = 0;
	reg32 = 0;
	push = 0;
	reg8 = 0;

	mdclk = (s->selected_timings.mem_clock == MEM_CLOCK_667MHz) ? 3000 : 2500;
	refclk = 3000 - mdclk;

	coretomcp = ((MCHBAR8(0x246) >> 2) & 0x3) + 1;
	coretomcp *= mdclk;

	reg8 = (MCHBAR8(0x188) & 0xe) >> 1;

	while (repeat) {
		txdelay = mdclk * (
				((MCHBAR16(0x220) >> 8) & 0x7) +
				(MCHBAR8(0x24d) & 0xf) +
				(MCHBAR8(0x24e) & 0x1)
				) +
				txfifotab[reg8]*(mdclk/2) +
				coretomcp +
				refclk +
				cwb;
		halfclk = (MCHBAR8(0x5d9) >> 1) & 0x1;
		if (halfclk) {
			txdelay -= mdclk / 2;
			reg32 = dqdqs_outdelay + coretomcp - mdclk / 2;
		} else {
			reg32 = dqdqs_outdelay + coretomcp;
		}

		tmaxunmask = txdelay - mdclk - dqdqs_out;
		tmaxpi = tmaxunmask - tpi;

		if ((tmaxunmask >= reg32) && tmaxpi >= dqdqs_delay) {
			if (repeat == 2) {
				MCHBAR32(0x2c0) = MCHBAR32(0x2c0) & ~(1 << 23);
			}
			feature = 1;
			repeat = 0;
		} else {
			repeat--;
			MCHBAR32(0x2c0) = MCHBAR32(0x2c0) | (1 << 23);
			cwb = 2 * mdclk;
		}
	}

	if (!feature) {
		MCHBAR8(0x2d1) = MCHBAR8(0x2d1) & ~0x3;
		return;
	}
	MCHBAR8(0x2d1) = MCHBAR8(0x2d1) | 0x3;
	MCHBAR16(0x210) = (MCHBAR16(0x210) & ~0xf000) | (pimdclk << 12);
	MCHBAR8(0x2c02) = (MCHBAR8(0x2c02) & ~0x77) | (push << 4) | push;
	MCHBAR32(0x2c0) = (MCHBAR32(0x2c0) & ~0xf000000) | 0x3000000;
}

/**
 * @param boot_path: 0 = normal, 1 = reset, 2 = resume from s3
 */
void sdram_initialize(int boot_path, const u8 *spd_addresses)
{
	struct sysinfo si;
	u8 reg8;
	const char *boot_str[] = { "Normal", "Reset", "Resume"};

	PRINTK_DEBUG("Setting up RAM controller.\n");

	memset(&si, 0, sizeof(si));

	si.boot_path = boot_path;
	printk(BIOS_DEBUG, "Boot path: %s\n", boot_str[boot_path]);
	si.spd_map[0] = spd_addresses[0];
	si.spd_map[1] = spd_addresses[1];
	si.spd_map[2] = spd_addresses[2];
	si.spd_map[3] = spd_addresses[3];

	sdram_read_spds(&si);

	/* Choose Common Frequency */
	sdram_detect_ram_speed(&si);

	/* Determine smallest common tRAS, tRP, tRCD, etc */
	sdram_detect_smallest_params(&si);

	/* Enable HPET */
	enable_hpet();
	hpet_udelay(300000);

	MCHBAR16(0xc1c) = MCHBAR16(0xc1c) | (1 << 15);

	hpet_udelay(100000);

	sdram_clk_crossing(&si);

	sdram_checkreset();
	PRINTK_DEBUG("Done checkreset\n");

	sdram_clkmode(&si);
	PRINTK_DEBUG("Done clkmode\n");

	sdram_timings(&si);
	PRINTK_DEBUG("Done timings (dqs dll enabled)\n");

	if (si.boot_path != BOOT_PATH_RESET) {
		sdram_dlltiming(&si);
		PRINTK_DEBUG("Done dlltiming\n");
	}

	hpet_udelay(200000);

	if (si.boot_path != BOOT_PATH_RESET) {
		sdram_rcomp(&si);
		PRINTK_DEBUG("Done RCOMP\n");
	}

	sdram_odt(&si);
	PRINTK_DEBUG("Done odt\n");

	if (si.boot_path != BOOT_PATH_RESET) {
		while ((MCHBAR8(0x130) & 0x1) != 0)
			;
	}

	sdram_mmap(&si);
	PRINTK_DEBUG("Done mmap\n");

	// Enable DDR IO buffer
	MCHBAR8(0x5dd) = (MCHBAR8(0x5dd) & ~0x3f) | 0x8;
	MCHBAR8(0x5d8) = MCHBAR8(0x5d8) | 0x1;

	sdram_rcompupdate(&si);
	PRINTK_DEBUG("Done RCOMP update\n");

	MCHBAR8(0x40) = MCHBAR8(0x40) | 0x2;

	if (si.boot_path != BOOT_PATH_RESUME) {
		MCHBAR32(0x260) = MCHBAR32(0x260) | (1 << 27);

		sdram_jedecinit(&si);
		PRINTK_DEBUG("Done MRS\n");
	}

	sdram_misc(&si);
	PRINTK_DEBUG("Done misc\n");

	sdram_zqcl(&si);
	PRINTK_DEBUG("Done zqcl\n");

	if (si.boot_path != BOOT_PATH_RESUME) {
		MCHBAR32(0x268) = MCHBAR32(0x268) | 0xc0000000;
	}

	sdram_dradrb(&si);
	PRINTK_DEBUG("Done dradrb\n");

	sdram_rcven(&si);
	PRINTK_DEBUG("Done rcven\n");

	sdram_new_trd(&si);
	PRINTK_DEBUG("Done tRD\n");

	sdram_mmap_regs(&si);
	PRINTK_DEBUG("Done mmap regs\n");

	sdram_enhancedmode(&si);
	PRINTK_DEBUG("Done enhanced mode\n");

	sdram_powersettings(&si);
	PRINTK_DEBUG("Done power settings\n");

	sdram_programddr();
	PRINTK_DEBUG("Done programming ddr\n");

	sdram_programdqdqs(&si);
	PRINTK_DEBUG("Done programming dqdqs\n");

	sdram_periodic_rcomp();
	PRINTK_DEBUG("Done periodic RCOMP\n");

	/* Set init done */
	MCHBAR32(0x268) = MCHBAR32(0x268) | 0x40000000;

	/* Tell ICH7 that we're done */
	reg8 = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xa2);
	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xa2, reg8 & ~0x80);

	/* Tell northbridge we're done */
	reg8 = pci_read_config8(PCI_DEV(0,0,0), 0xf4);
	pci_write_config8(PCI_DEV(0,0,0), 0xf4, reg8 | 1);

	printk(BIOS_DEBUG, "RAM initialization finished.\n");
}