The point of the patch is to make it easier to understand the raminit

[coreboot.git] / src / northbridge / amd / amdk8 / raminit_f.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2002 Linux Networx
 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
 * Copyright (C) 2004 YingHai Lu
 * Copyright (C) 2008 Advanced Micro Devices, Inc.
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
*/

#include <cpu/x86/mem.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/tsc.h>

#include <stdlib.h>
#include "raminit.h"
#include "amdk8_f.h"
#include <spd_ddr2.h>

#ifndef QRANK_DIMM_SUPPORT
#define QRANK_DIMM_SUPPORT 0
#endif

#if CONFIG_USE_PRINTK_IN_CAR
#else
#error This file needs CONFIG_USE_PRINTK_IN_CAR
#endif

#define RAM_TIMING_DEBUG 0

#if RAM_TIMING_DEBUG == 1
#define printk_raminit printk_debug
#else
#define printk_raminit(fmt, arg...)
#endif


#if (CONFIG_LB_MEM_TOPK & (CONFIG_LB_MEM_TOPK -1)) != 0
# error "CONFIG_LB_MEM_TOPK must be a power of 2"
#endif

#include "amdk8_f_pci.c"


        /* for PCI_ADDR(0, 0x18, 2, 0x98) index,
         and PCI_ADDR(0x, 0x18, 2, 0x9c) data */
        /*
                index:
                [29: 0] DctOffset (Dram Controller Offset)
                [30:30] DctAccessWrite (Dram Controller Read/Write Select)
                        0 = read access
                        1 = write access
                [31:31] DctAccessDone (Dram Controller Access Done)
                        0 = Access in progress
                        1 = No access is progress

                Data:
                [31: 0] DctOffsetData (Dram Controller Offset Data)

                Read:
                        - Write the register num to DctOffset with
                          DctAccessWrite = 0
                        - poll the DctAccessDone until it = 1
                        - Read the data from DctOffsetData
                Write:
                        - Write the data to DctOffsetData
                        - Write register num to DctOffset with DctAccessWrite = 1
                        - poll the DctAccessDone untio it = 1
        */


static void setup_resource_map(const unsigned int *register_values, int max)
{
        int i;
        for (i = 0; i < max; i += 3) {
                device_t dev;
                unsigned where;
                unsigned long reg;
                dev = register_values[i] & ~0xff;
                where = register_values[i] & 0xff;
                reg = pci_read_config32(dev, where);
                reg &= register_values[i+1];
                reg |= register_values[i+2];
                pci_write_config32(dev, where, reg);
        }
}

static int controller_present(const struct mem_controller *ctrl)
{
        return pci_read_config32(ctrl->f0, 0) == 0x11001022;
}

static void sdram_set_registers(const struct mem_controller *ctrl, struct sys_info *sysinfo)
{
        static const unsigned int register_values[] = {

        /* Careful set limit registers before base registers which
           contain the enables */
        /* DRAM Limit i Registers
         * F1:0x44 i = 0
         * F1:0x4C i = 1
         * F1:0x54 i = 2
         * F1:0x5C i = 3
         * F1:0x64 i = 4
         * F1:0x6C i = 5
         * F1:0x74 i = 6
         * F1:0x7C i = 7
         * [ 2: 0] Destination Node ID
         *         000 = Node 0
         *         001 = Node 1
         *         010 = Node 2
         *         011 = Node 3
         *         100 = Node 4
         *         101 = Node 5
         *         110 = Node 6
         *         111 = Node 7
         * [ 7: 3] Reserved
         * [10: 8] Interleave select
         *         specifies the values of A[14:12] to use with interleave enable.
         * [15:11] Reserved
         * [31:16] DRAM Limit Address i Bits 39-24
         *         This field defines the upper address bits of a 40 bit  address
         *         that define the end of the DRAM region.
         */
        PCI_ADDR(0, 0x18, 1, 0x44), 0x0000f8f8, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x4C), 0x0000f8f8, 0x00000001,
        PCI_ADDR(0, 0x18, 1, 0x54), 0x0000f8f8, 0x00000002,
        PCI_ADDR(0, 0x18, 1, 0x5C), 0x0000f8f8, 0x00000003,
        PCI_ADDR(0, 0x18, 1, 0x64), 0x0000f8f8, 0x00000004,
        PCI_ADDR(0, 0x18, 1, 0x6C), 0x0000f8f8, 0x00000005,
        PCI_ADDR(0, 0x18, 1, 0x74), 0x0000f8f8, 0x00000006,
        PCI_ADDR(0, 0x18, 1, 0x7C), 0x0000f8f8, 0x00000007,
        /* DRAM Base i Registers
         * F1:0x40 i = 0
         * F1:0x48 i = 1
         * F1:0x50 i = 2
         * F1:0x58 i = 3
         * F1:0x60 i = 4
         * F1:0x68 i = 5
         * F1:0x70 i = 6
         * F1:0x78 i = 7
         * [ 0: 0] Read Enable
         *         0 = Reads Disabled
         *         1 = Reads Enabled
         * [ 1: 1] Write Enable
         *         0 = Writes Disabled
         *         1 = Writes Enabled
         * [ 7: 2] Reserved
         * [10: 8] Interleave Enable
         *         000 = No interleave
         *         001 = Interleave on A[12] (2 nodes)
         *         010 = reserved
         *         011 = Interleave on A[12] and A[14] (4 nodes)
         *         100 = reserved
         *         101 = reserved
         *         110 = reserved
         *         111 = Interleve on A[12] and A[13] and A[14] (8 nodes)
         * [15:11] Reserved
         * [13:16] DRAM Base Address i Bits 39-24
         *         This field defines the upper address bits of a 40-bit address
         *         that define the start of the DRAM region.
         */
        PCI_ADDR(0, 0x18, 1, 0x40), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x48), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x50), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x58), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x60), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x68), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x70), 0x0000f8fc, 0x00000000,
        PCI_ADDR(0, 0x18, 1, 0x78), 0x0000f8fc, 0x00000000,

        /* DRAM CS Base Address i Registers
         * F2:0x40 i = 0
         * F2:0x44 i = 1
         * F2:0x48 i = 2
         * F2:0x4C i = 3
         * F2:0x50 i = 4
         * F2:0x54 i = 5
         * F2:0x58 i = 6
         * F2:0x5C i = 7
         * [ 0: 0] Chip-Select Bank Enable
         *         0 = Bank Disabled
         *         1 = Bank Enabled
         * [ 1: 1] Spare Rank
         * [ 2: 2] Memory Test Failed
         * [ 4: 3] Reserved
         * [13: 5] Base Address (21-13)
         *         An optimization used when all DIMM are the same size...
         * [18:14] Reserved
         * [28:19] Base Address (36-27)
         *         This field defines the top 11 addresses bit of a 40-bit
         *         address that define the memory address space.  These
         *         bits decode 32-MByte blocks of memory.
         * [31:29] Reserved
         */
        PCI_ADDR(0, 0x18, 2, 0x40), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x44), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x48), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x4C), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x50), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x54), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x58), 0xe007c018, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x5C), 0xe007c018, 0x00000000,
        /* DRAM CS Mask Address i Registers
         * F2:0x60 i = 0,1
         * F2:0x64 i = 2,3
         * F2:0x68 i = 4,5
         * F2:0x6C i = 6,7
         * Select bits to exclude from comparison with the DRAM Base address register.
         * [ 4: 0] Reserved
         * [13: 5] Address Mask (21-13)
         *         Address to be excluded from the optimized case
         * [18:14] Reserved
         * [28:19] Address Mask (36-27)
         *         The bits with an address mask of 1 are excluded from address comparison
         * [31:29] Reserved
         *
         */
        PCI_ADDR(0, 0x18, 2, 0x60), 0xe007c01f, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x64), 0xe007c01f, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x68), 0xe007c01f, 0x00000000,
        PCI_ADDR(0, 0x18, 2, 0x6C), 0xe007c01f, 0x00000000,

        /* DRAM Control Register
         * F2:0x78
         * [ 3: 0] RdPtrInit ( Read Pointer Initial Value)
         *      0x03-0x00: reserved
         * [ 6: 4] RdPadRcvFifoDly (Read Delay from Pad Receive FIFO)
         *      000 = reserved
         *      001 = reserved
         *      010 = 1.5 Memory Clocks
         *      011 = 2 Memory Clocks
         *      100 = 2.5 Memory Clocks
         *      101 = 3 Memory Clocks
         *      110 = 3.5 Memory Clocks
         *      111 = Reseved
         * [15: 7] Reserved
         * [16:16] AltVidC3MemClkTriEn (AltVID Memory Clock Tristate Enable)
         *      Enables the DDR memory clocks to be tristated when alternate VID
         *      mode is enabled. This bit has no effect if the DisNbClkRamp bit
         *      (F3, 0x88) is set
         * [17:17] DllTempAdjTime (DLL Temperature Adjust Cycle Time)
         *      0 = 5 ms
         *      1 = 1 ms
         * [18:18] DqsRcvEnTrain (DQS Receiver Enable Training Mode)
         *      0 = Normal DQS Receiver enable operation
         *      1 = DQS receiver enable training mode
          * [31:19] reverved
         */
        PCI_ADDR(0, 0x18, 2, 0x78), 0xfff80000, (6<<4)|(6<<0),

        /* DRAM Initialization Register
         * F2:0x7C
         * [15: 0] MrsAddress (Address for MRS/EMRS Commands)
         *      this field specifies the dsata driven on the DRAM address pins
         *      15-0 for MRS and EMRS commands
         * [18:16] MrsBank (Bank Address for MRS/EMRS Commands)
         *      this files specifies the data driven on the DRAM bank pins for
         *      the MRS and EMRS commands
         * [23:19] reverved
         * [24:24] SendPchgAll (Send Precharge All Command)
         *      Setting this bit causes the DRAM controller to send a precharge
         *      all command. This bit is cleared by the hardware after the
         *      command completes
         * [25:25] SendAutoRefresh (Send Auto Refresh Command)
         *      Setting this bit causes the DRAM controller to send an auto
         *      refresh command. This bit is cleared by the hardware after the
         *      command completes
         * [26:26] SendMrsCmd (Send MRS/EMRS Command)
         *      Setting this bit causes the DRAM controller to send the MRS or
         *      EMRS command defined by the MrsAddress and MrsBank fields. This
         *      bit is cleared by the hardware adter the commmand completes
         * [27:27] DeassertMemRstX (De-assert Memory Reset)
         *      Setting this bit causes the DRAM controller to de-assert the
         *      memory reset pin. This bit cannot be used to assert the memory
         *      reset pin
         * [28:28] AssertCke (Assert CKE)
         *      setting this bit causes the DRAM controller to assert the CKE
         *      pins. This bit cannot be used to de-assert the CKE pins
         * [30:29] reverved
         * [31:31] EnDramInit (Enable DRAM Initialization)
         *      Setting this bit puts the DRAM controller in a BIOS controlled
         *      DRAM initialization mode. BIOS must clear this bit aster DRAM
         *      initialization is complete.
         */
//      PCI_ADDR(0, 0x18, 2, 0x7C), 0x60f80000, 0,


        /* DRAM Bank Address Mapping Register
         * F2:0x80
         * Specify the memory module size
         * [ 3: 0] CS1/0
         * [ 7: 4] CS3/2
         * [11: 8] CS5/4
         * [15:12] CS7/6
         * [31:16]
              row    col   bank
          0:  13     9      2    :128M
          1:  13     10     2    :256M
          2:  14     10     2    :512M
          3:  13     11     2    :512M
          4:  13     10     3    :512M
          5:  14     10     3    :1G
          6:  14     11     2    :1G
          7:  15     10     3    :2G
          8:  14     11     3    :2G
          9:  15     11     3    :4G
         10:  16     10     3    :4G
         11:  16     11     3    :8G
         */
        PCI_ADDR(0, 0x18, 2, 0x80), 0xffff0000, 0x00000000,
        /* DRAM Timing Low Register
         * F2:0x88
         * [ 2: 0] Tcl (Cas# Latency, Cas# to read-data-valid)
         *         000 = reserved
         *         001 = reserved
         *         010 = CL 3
         *         011 = CL 4
         *         100 = CL 5
         *         101 = CL 6
         *         110 = reserved
         *         111 = reserved
         * [ 3: 3] Reserved
         * [ 5: 4] Trcd (Ras#-active to Cas# read/write delay)
         *         00 = 3 clocks
         *         01 = 4 clocks
         *         10 = 5 clocks
         *         11 = 6 clocks
         * [ 7: 6] Reserved
         * [ 9: 8] Trp (Row Precharge Time, Precharge-to-Active or Auto-Refresh)
         *         00 = 3 clocks
         *         01 = 4 clocks
         *         10 = 5 clocks
         *         11 = 6 clocks
         * [10:10] Reserved
         * [11:11] Trtp (Read to Precharge Time, read Cas# to precharge time)
         *         0 = 2 clocks for Burst Length of 32 Bytes
         *             4 clocks for Burst Length of 64 Bytes
         *         1 = 3 clocks for Burst Length of 32 Bytes
         *             5 clocks for Burst Length of 64 Bytes
         * [15:12] Tras (Minimum Ras# Active Time)
         *         0000 = reserved
         *         0001 = reserved
         *         0010 = 5 bus clocks
         *         ...
         *         1111 = 18 bus clocks
         * [19:16] Trc (Row Cycle Time, Ras#-active to Ras#-active or auto
         * refresh of the same bank)
         *         0000 = 11 bus clocks
         *         0010 = 12 bus clocks
         *         ...
         *         1110 = 25 bus clocks
         *         1111 = 26 bus clocks
         * [21:20] Twr (Write Recovery Time, From the last data to precharge,
         * writes can go back-to-back)
         *         00 = 3 bus clocks
         *         01 = 4 bus clocks
         *         10 = 5 bus clocks
         *         11 = 6 bus clocks
         * [23:22] Trrd (Active-to-active(Ras#-to-Ras#) Delay of different banks)
         *         00 = 2 bus clocks
         *         01 = 3 bus clocks
         *         10 = 4 bus clocks
         *         11 = 5 bus clocks
         * [31:24] MemClkDis ( Disable the MEMCLK outputs for DRAM channel A,
         * BIOS should set it to reduce the power consumption)
         *        Bit           F(1207)         M2 Package      S1g1 Package
         *          0           N/A             MA1_CLK1        N/A
         *          1           N/A             MA0_CLK1        MA0_CLK1
         *          2           MA3_CLK         N/A             N/A
         *          3           MA2_CLK         N/A             N/A
         *          4           MA1_CLK         MA1_CLK0        N/A
         *          5           MA0_CLK         MA0_CLK0        MA0_CLK0
         *          6           N/A             MA1_CLK2        N/A
         *          7           N/A             MA0_CLK2        MA0_CLK2
         */
        PCI_ADDR(0, 0x18, 2, 0x88), 0x000004c8, 0xff000002 /* 0x03623125 */ ,
        /* DRAM Timing High Register
         * F2:0x8C
         * [ 3: 0] Reserved
         * [ 6: 4] TrwtTO (Read-to-Write Turnaround for Data, DQS Contention)
         *         000 = 2 bus clocks
         *         001 = 3 bus clocks
         *         010 = 4 bus clocks
         *         011 = 5 bus clocks
         *         100 = 6 bus clocks
         *         101 = 7 bus clocks
         *         110 = 8 bus clocks
         *         111 = 9 bus clocks
         * [ 7: 7] Reserved
         * [ 9: 8] Twtr (Internal DRAM Write-to-Read Command Delay, 
         * minium write-to-read delay when both access the same chip select)
         *         00 = Reserved
         *         01 = 1 bus clocks
         *         10 = 2 bus clocks
         *         11 = 3 bus clocks
         * [11:10] Twrrd (Write to Read DIMM Termination Turnaround, minimum
         * write-to-read delay when accessing two different DIMMs)
         *         00 = 0 bus clocks
         *         01 = 1 bus clocks
         *         10 = 2 bus clocks
         *         11 = 3 bus clocks
         * [13:12] Twrwr (Write to Write Timing)
         *         00 = 1 bus clocks ( 0 idle cycle on the bus)
         *         01 = 2 bus clocks ( 1 idle cycle on the bus)
         *         10 = 3 bus clocks ( 2 idle cycles on the bus)
         *         11 = Reserved
         * [15:14] Trdrd ( Read to Read Timing)
         *         00 = 2 bus clocks ( 1 idle cycle on the bus)
         *         01 = 3 bus clocks ( 2 idle cycles on the bus)
         *         10 = 4 bus clocks ( 3 idle cycles on the bus)
         *         11 = 5 bus clocks ( 4 idel cycles on the bus)
         * [17:16] Tref (Refresh Rate)
         *         00 = Undefined behavior
         *         01 = Reserved
         *         10 = Refresh interval of 7.8 microseconds
         *         11 = Refresh interval of 3.9 microseconds
         * [19:18] Reserved
         * [22:20] Trfc0 ( Auto-Refresh Row Cycle Time for the Logical DIMM0,
         *      based on DRAM density and speed)
         *         000 = 75 ns (all speeds, 256Mbit)
         *         001 = 105 ns (all speeds, 512Mbit)
         *         010 = 127.5 ns (all speeds, 1Gbit)
         *         011 = 195 ns (all speeds, 2Gbit)
         *         100 = 327.5 ns (all speeds, 4Gbit)
         *         101 = reserved
         *         110 = reserved
         *         111 = reserved
         * [25:23] Trfc1 ( Auto-Refresh Row Cycle Time for the Logical DIMM1,
         *      based on DRAM density and speed)
         * [28:26] Trfc2 ( Auto-Refresh Row Cycle Time for the Logical DIMM2,
         *      based on DRAM density and speed)
         * [31:29] Trfc3 ( Auto-Refresh Row Cycle Time for the Logical DIMM3,
         *      based on DRAM density and speed)
         */
        PCI_ADDR(0, 0x18, 2, 0x8c), 0x000c008f, (2 << 16)|(1 << 8),
        /* DRAM Config Low Register
         * F2:0x90
         * [ 0: 0] InitDram (Initialize DRAM)
         *         1 = write 1 cause DRAM controller to execute the DRAM
         *             initialization, when done it read to 0
         * [ 1: 1] ExitSelfRef ( Exit Self Refresh Command )
         *         1 = write 1 causes the DRAM controller to bring the DRAMs out
         *             for self refresh mode
         * [ 3: 2] Reserved
         * [ 5: 4] DramTerm (DRAM Termination)
         *         00 = On die termination disabled
         *         01 = 75 ohms
         *         10 = 150 ohms
         *         11 = 50 ohms
         * [ 6: 6] Reserved
         * [ 7: 7] DramDrvWeak ( DRAM Drivers Weak Mode)
         *         0 = Normal drive strength mode.
         *         1 = Weak drive strength mode
         * [ 8: 8] ParEn (Parity Enable)
         *         1 = Enable address parity computation output, PAR,
         *             and enables the parity error input, ERR
         * [ 9: 9] SelfRefRateEn (Faster Self Refresh Rate Enable)
         *        1 = Enable high temperature ( two times normal )
         *            self refresh rate
         * [10:10] BurstLength32 ( DRAM Burst Length Set for 32 Bytes)
         *         0 = 64-byte mode
         *         1 = 32-byte mode
         * [11:11] Width128 ( Width of DRAM interface)
         *         0 = the controller DRAM interface is 64-bits wide
         *         1 = the controller DRAM interface is 128-bits wide
         * [12:12] X4Dimm (DIMM 0 is x4)
         * [13:13] X4Dimm (DIMM 1 is x4)
         * [14:14] X4Dimm (DIMM 2 is x4)
         * [15:15] X4Dimm (DIMM 3 is x4)
         *         0 = DIMM is not x4
         *         1 = x4 DIMM present
         * [16:16] UnBuffDimm ( Unbuffered DIMMs)
         *         0 = Buffered DIMMs
         *         1 = Unbuffered DIMMs
         * [18:17] Reserved
         * [19:19] DimmEccEn ( DIMM ECC Enable )
         *         1 =  ECC checking is being enabled for all DIMMs on the DRAM
         *              controller ( Through F3 0x44[EccEn])
         * [31:20] Reserved
         */
        PCI_ADDR(0, 0x18, 2, 0x90), 0xfff6004c, 0x00000010,
        /* DRAM Config High Register
         * F2:0x94
         * [ 0: 2] MemClkFreq ( Memory Clock Frequency)
         *         000 = 200MHz
         *         001 = 266MHz
         *         010 = 333MHz
         *         011 = reserved
         *         1xx = reserved
         * [ 3: 3] MemClkFreqVal (Memory Clock Freqency Valid)
         *         1 = BIOS need to set the bit when setting up MemClkFreq to
         *             the proper value
         * [ 7: 4] MaxAsyncLat ( Maximum Asynchronous Latency)
         *         0000 = 0 ns
         *         ...
         *         1111 = 15 ns
         * [11: 8] Reserved
         * [12:12] RDqsEn ( Read DQS Enable) This bit is only be set if x8
         *         registered DIMMs are present in the system
         *         0 = DM pins function as data mask pins
         *         1 = DM pins function as read DQS pins
         * [13:13] Reserved
         * [14:14] DisDramInterface ( Disable the DRAM interface ) When this bit
         * is set, the DRAM controller is disabled, and interface in low power
         * state
         *         0 = Enabled (default)
         *         1 = Disabled
         * [15:15] PowerDownEn ( Power Down Mode Enable )
         *         0 = Disabled (default)
         *         1 = Enabled
         * [16:16] PowerDown ( Power Down Mode )
         *         0 = Channel CKE Control
         *         1 = Chip Select CKE Control
         * [17:17] FourRankSODimm (Four Rank SO-DIMM)
         *         1 = this bit is set by BIOS to indicate that a four rank
         *             SO-DIMM is present
         * [18:18] FourRankRDimm (Four Rank Registered DIMM)
         *         1 = this bit is set by BIOS to indicate that a four rank
         *             registered DIMM is present
         * [19:19] Reserved
         * [20:20] SlowAccessMode (Slow Access Mode (2T Mode))
         *         0 = DRAM address and control signals are driven for one 
         *             MEMCLK cycle
         *         1 = One additional MEMCLK of setup time is provided on all
         *             DRAM address and control signals except CS, CKE, and ODT;
         *             i.e., these signals are drivern for two MEMCLK cycles
         *             rather than one
         * [21:21] Reserved
         * [22:22] BankSwizzleMode ( Bank Swizzle Mode),
         *         0 = Disabled (default)
         *         1 = Enabled
         * [23:23] Reserved
         * [27:24] DcqBypassMax ( DRAM Controller Queue Bypass Maximum)
         *         0000 = No bypass; the oldest request is never bypassed
         *         0001 = The oldest request may be bypassed no more than 1 time
         *         ...
         *         1111 = The oldest request may be bypassed no more than 15\
         *                times
         * [31:28] FourActWindow ( Four Bank Activate Window) , not more than
         *         4 banks in a 8 bank device are activated
         *         0000 = No tFAW window restriction
         *         0001 = 8 MEMCLK cycles
         *         0010 = 9 MEMCLK cycles
         *         ...
         *         1101 = 20 MEMCLK cycles
         *         111x = reserved
         */
        PCI_ADDR(0, 0x18, 2, 0x94), 0x00a82f00,0x00008000,
        /* DRAM Delay Line Register
         * F2:0xa0
         * [ 0: 0] MemClrStatus (Memory Clear Status) : Readonly
         *         when set, this bit indicates that the memory clear function
         *         is complete. Only clear by reset. BIOS should not write or
         *         read the DRAM until this bit is set by hardware
         * [ 1: 1] DisableJitter ( Disable Jitter)
         *         When set the DDR compensation circuit will not change the
         *         values unless the change is more than one step from the
         *         current value
         * [ 3: 2] RdWrQByp ( Read/Write Queue Bypass Count)
         *         00 = 2
         *         01 = 4
         *         10 = 8
         *         11 = 16
         * [ 4: 4] Mode64BitMux (Mismatched DIMM Support Enable)
         *         1 When bit enables support for mismatched DIMMs when using
         *         128-bit DRAM interface, the Width128 no effect, only for
         *         AM2 and s1g1
         * [ 5: 5] DCC_EN ( Dynamica Idle Cycle Counter Enable)
         *         When set to 1, indicates that each entry in the page tables
         *         dynamically adjusts the idle cycle limit based on page
         *          Conflict/Page Miss (PC/PM) traffic
         * [ 8: 6] ILD_lmt ( Idle Cycle Limit)
         *         000 = 0 cycles
         *         001 = 4 cycles
         *         010 = 8 cycles
         *         011 = 16 cycles
         *         100 = 32 cycles
         *         101 = 64 cycles
         *         110 = 128 cycles
         *         111 = 256 cycles
         * [ 9: 9] DramEnabled ( DRAM Enabled)
         *         When Set, this bit indicates that the DRAM is enabled, this
         *         bit is set by hardware after DRAM initialization or on an exit
         *         from self refresh. The DRAM controller is intialized after the
         *         hardware-controlled initialization process ( initiated by the
         *         F2 0x90[DramInit]) completes or when the BIOS-controlled
         *         initialization process completes (F2 0x7c(EnDramInit] is
         *         written from 1 to 0)
         * [23:10] Reserved
         * [31:24] MemClkDis ( Disable the MEMCLK outputs for DRAM channel B,
         *         BIOS should set it to reduce the power consumption)
         *         Bit          F(1207)         M2 Package      S1g1 Package
         *          0           N/A             MA1_CLK1        N/A
         *          1           N/A             MA0_CLK1        MA0_CLK1
         *          2           MA3_CLK         N/A             N/A
         *          3           MA2_CLK         N/A             N/A
         *          4           MA1_CLK         MA1_CLK0        N/A
         *          5           MA0_CLK         MA0_CLK0        MA0_CLK0
         *          6           N/A             MA1_CLK2        N/A
         *          7           N/A             MA0_CLK2        MA0_CLK2
         */
        PCI_ADDR(0, 0x18, 2, 0xa0), 0x00fffc00, 0xff000000,

        /* DRAM Scrub Control Register
         * F3:0x58
         * [ 4: 0] DRAM Scrube Rate
         * [ 7: 5] reserved
         * [12: 8] L2 Scrub Rate
         * [15:13] reserved
         * [20:16] Dcache Scrub
         * [31:21] reserved
         *         Scrub Rates
         *         00000 = Do not scrub
         *         00001 =  40.00 ns
         *         00010 =  80.00 ns
         *         00011 = 160.00 ns
         *         00100 = 320.00 ns
         *         00101 = 640.00 ns
         *         00110 =   1.28 us
         *         00111 =   2.56 us
         *         01000 =   5.12 us
         *         01001 =  10.20 us
         *         01011 =  41.00 us
         *         01100 =  81.90 us
         *         01101 = 163.80 us
         *         01110 = 327.70 us
         *         01111 = 655.40 us
         *         10000 =   1.31 ms
         *         10001 =   2.62 ms
         *         10010 =   5.24 ms
         *         10011 =  10.49 ms
         *         10100 =  20.97 ms
         *         10101 =  42.00 ms
         *         10110 =  84.00 ms
         *         All Others = Reserved
         */
        PCI_ADDR(0, 0x18, 3, 0x58), 0xffe0e0e0, 0x00000000,
        /* DRAM Scrub Address Low Register
         * F3:0x5C
         * [ 0: 0] DRAM Scrubber Redirect Enable
         *         0 = Do nothing
         *         1 = Scrubber Corrects errors found in normal operation
         * [ 5: 1] Reserved
         * [31: 6] DRAM Scrub Address 31-6
         */
        PCI_ADDR(0, 0x18, 3, 0x5C), 0x0000003e, 0x00000000,
        /* DRAM Scrub Address High Register
         * F3:0x60
         * [ 7: 0] DRAM Scrubb Address 39-32
         * [31: 8] Reserved
         */
        PCI_ADDR(0, 0x18, 3, 0x60), 0xffffff00, 0x00000000,
        };
        /* for PCI_ADDR(0, 0x18, 2, 0x98) index,
         and PCI_ADDR(0x, 0x18, 2, 0x9c) data */
        /*
                index:
                [29: 0] DctOffset (Dram Controller Offset)
                [30:30] DctAccessWrite (Dram Controller Read/Write Select)
                        0 = read access
                        1 = write access
                [31:31] DctAccessDone (Dram Controller Access Done)
                        0 = Access in progress
                        1 = No access is progress

                Data:
                [31: 0] DctOffsetData (Dram Controller Offset Data)

                Read:
                        - Write the register num to DctOffset with DctAccessWrite = 0
                        - poll the DctAccessDone until it = 1
                        - Read the data from DctOffsetData
                Write:
                        - Write the data to DctOffsetData
                        - Write register num to DctOffset with DctAccessWrite = 1
                        - poll the DctAccessDone untio it = 1

        */
        int i;
        int max;

        if (!controller_present(ctrl)) {
                sysinfo->ctrl_present[ctrl->node_id] = 0;
                return;
        }
        sysinfo->ctrl_present[ctrl->node_id] = 1;

        printk_spew("setting up CPU %02x northbridge registers\n", ctrl->node_id);
        max = ARRAY_SIZE(register_values);
        for (i = 0; i < max; i += 3) {
                device_t dev;
                unsigned where;
                unsigned long reg;
                dev = (register_values[i] & ~0xff) - PCI_DEV(0, 0x18, 0) + ctrl->f0;
                where = register_values[i] & 0xff;
                reg = pci_read_config32(dev, where);
                reg &= register_values[i+1];
                reg |= register_values[i+2];
                pci_write_config32(dev, where, reg);
        }
        printk_spew("done.\n");
}

static int is_dual_channel(const struct mem_controller *ctrl)
{
        uint32_t dcl;
        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        return dcl & DCL_Width128;
}

static int is_opteron(const struct mem_controller *ctrl)
{
        /* Test to see if I am an Opteron.
         * FIXME Testing dual channel capability is correct for now
         * but a better test is probably required.
         * m2 and s1g1 support dual channel too. but only support unbuffered dimm
         */
#warning "FIXME implement a better test for opterons"
        uint32_t nbcap;
        nbcap = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
        return !!(nbcap & NBCAP_128Bit);
}

static int is_registered(const struct mem_controller *ctrl)
{
        /* Test to see if we are dealing with registered SDRAM.
         * If we are not registered we are unbuffered.
         * This function must be called after spd_handle_unbuffered_dimms.
         */
        uint32_t dcl;
        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        return !(dcl & DCL_UnBuffDimm);
}


static void spd_get_dimm_size(unsigned device, struct dimm_size *sz)
{
        /* Calculate the log base 2 size of a DIMM in bits */
        int value;
        sz->per_rank = 0;
        sz->rows = 0;
        sz->col = 0;
        sz->rank = 0;

        value = spd_read_byte(device, SPD_ROW_NUM);     /* rows */
        if (value < 0) goto hw_err;
        if ((value & 0xff) == 0) goto val_err; /* max is 16 ? */
        sz->per_rank += value & 0xff;
        sz->rows = value & 0xff;

        value = spd_read_byte(device, SPD_COL_NUM);     /* columns */
        if (value < 0) goto hw_err;
        if ((value & 0xff) == 0) goto val_err;  /* max is 11 */
        sz->per_rank += value & 0xff;
        sz->col = value & 0xff;

        value = spd_read_byte(device, SPD_BANK_NUM);    /* banks */
        if (value < 0) goto hw_err;
        if ((value & 0xff) == 0) goto val_err;
        sz->bank = log2(value & 0xff);  // convert 4 to 2, and 8 to 3
        sz->per_rank += sz->bank;

        /* Get the module data width and convert it to a power of two */
        value = spd_read_byte(device, SPD_DATA_WIDTH);
        if (value < 0) goto hw_err;
        value &= 0xff;
        if ((value != 72) && (value != 64)) goto val_err;
        sz->per_rank += log2(value) - 3; //64 bit So another 3 lines

        /* How many ranks? */
        /* number of physical banks */
        value = spd_read_byte(device, SPD_MOD_ATTRIB_RANK);
        if (value < 0) goto hw_err;
/*      value >>= SPD_MOD_ATTRIB_RANK_NUM_SHIFT; */
        value &= SPD_MOD_ATTRIB_RANK_NUM_MASK;
        value += SPD_MOD_ATTRIB_RANK_NUM_BASE; // 0-->1, 1-->2, 3-->4
        /*
          rank == 1 only one rank or say one side
          rank == 2 two side , and two ranks
          rank == 4 two side , and four ranks total
          Some one side two ranks, because of stacked
        */
        if ((value != 1) && (value != 2) && (value != 4 )) {
                goto val_err;
        }
        sz->rank = value;

        /* verify if per_rank is equal byte 31
          it has the DIMM size as a multiple of 128MB.
          */
        value = spd_read_byte(device, SPD_RANK_SIZE);
        if (value < 0) goto hw_err;
        value &= 0xff;
        value = log2(value);
        if (value <=4 ) value += 8; // add back to 1G to high
        value += (27-5); // make 128MB to the real lines
        if ( value != (sz->per_rank)) {
                printk_err("Bad RANK Size --\n");
                goto val_err;
        }

        goto out;

 val_err:
        die("Bad SPD value\n");
        /* If an hw_error occurs report that I have no memory */
 hw_err:
        sz->per_rank = 0;
        sz->rows = 0;
        sz->col = 0;
        sz->bank = 0;
        sz->rank = 0;
 out:
        return;
}


static void set_dimm_size(const struct mem_controller *ctrl,
                          struct dimm_size *sz, unsigned index,
                          struct mem_info *meminfo)
{
        uint32_t base0, base1;

        /* For each base register.
         * Place the dimm size in 32 MB quantities in the bits 31 - 21.
         * The initialize dimm size is in bits.
         * Set the base enable bit0.
         */

        base0 = base1 = 0;

        /* Make certain side1 of the dimm is at least 128MB */
        if (sz->per_rank >= 27) {
                base0 = (1 << ((sz->per_rank - 27 ) + 19)) | 1;
        }

        /* Make certain side2 of the dimm is at least 128MB */
        if (sz->rank > 1) { // 2 ranks or 4 ranks
                base1 = (1 << ((sz->per_rank - 27 ) + 19)) | 1;
        }

        /* Double the size if we are using dual channel memory */
        if (meminfo->is_Width128) {
                base0 = (base0 << 1) | (base0 & 1);
                base1 = (base1 << 1) | (base1 & 1);
        }

        /* Clear the reserved bits */
        base0 &= ~0xe007fffe;
        base1 &= ~0xe007fffe;

        if (!(meminfo->dimm_mask & 0x0F) && (meminfo->dimm_mask & 0xF0)) { /* channelB only? */
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 4) << 2), base0);
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 5) << 2), base1);
        } else {
                /* Set the appropriate DIMM base address register */
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 0) << 2), base0);
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 1) << 2), base1);
#if QRANK_DIMM_SUPPORT == 1
                if (sz->rank == 4) {
                        pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 4) << 2), base0);
                        pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 5) << 2), base1);
                }
#endif
        }

        /* Enable the memory clocks for this DIMM by Clear the MemClkDis bit*/
        if (base0) {
                uint32_t dword;
                uint32_t ClkDis0;
#if CPU_SOCKET_TYPE == 0x10 /* L1 */
                ClkDis0 = DTL_MemClkDis0;
#elif CPU_SOCKET_TYPE == 0x11 /* AM2 */
                ClkDis0 = DTL_MemClkDis0_AM2;
#elif CPU_SOCKET_TYPE == 0x12   /* S1G1 */
                ClkDis0 = DTL_MemClkDis0_S1g1;
#endif

                if (!(meminfo->dimm_mask & 0x0F) && (meminfo->dimm_mask & 0xF0)) { /* channelB only? */
                        dword = pci_read_config32(ctrl->f2, DRAM_CTRL_MISC);
                        dword &= ~(ClkDis0 >> index);
                        pci_write_config32(ctrl->f2, DRAM_CTRL_MISC, dword);

                } else {
                        dword = pci_read_config32(ctrl->f2, DRAM_TIMING_LOW); //Channel A
                        dword &= ~(ClkDis0 >> index);
#if QRANK_DIMM_SUPPORT == 1
                        if (sz->rank == 4) {
                                dword &= ~(ClkDis0 >> (index+2));
                        }
#endif
                        pci_write_config32(ctrl->f2, DRAM_TIMING_LOW, dword);

                        if (meminfo->is_Width128) { // ChannelA+B
                                dword = pci_read_config32(ctrl->f2, DRAM_CTRL_MISC);
                                dword &= ~(ClkDis0 >> index);
#if QRANK_DIMM_SUPPORT == 1
                                if (sz->rank == 4) {
                                        dword &= ~(ClkDis0 >> (index+2));
                                }
#endif
                                pci_write_config32(ctrl->f2, DRAM_CTRL_MISC, dword);
                        }
                }

        }
}

/*    row    col   bank  for 64 bit
  0:  13     9      2    :128M
  1:  13     10     2    :256M
  2:  14     10     2    :512M
  3:  13     11     2    :512M
  4:  13     10     3    :512M
  5:  14     10     3    :1G
  6:  14     11     2    :1G
  7:  15     10     3    :2G
  8:  14     11     3    :2G
  9:  15     11     3    :4G
 10:  16     10     3    :4G
 11:  16     11     3    :8G
*/


static void set_dimm_cs_map(const struct mem_controller *ctrl,
                             struct dimm_size *sz, unsigned index,
                             struct mem_info *meminfo)
{
        static const uint8_t cs_map_aaa[24] = {
                /* (bank=2, row=13, col=9)(3, 16, 11) ---> (0, 0, 0) (1, 3, 2) */
        //Bank2
                0, 1, 3,
                0, 2, 6,
                0, 0, 0,
                0, 0, 0,
        //Bank3
                0, 4, 0,
                0, 5, 8,
                0, 7, 9,
                0,10,11,
        };

        uint32_t map;

        if (!(meminfo->dimm_mask & 0x0F) && (meminfo->dimm_mask & 0xF0)) { /* channelB only? */
                index += 2;
        }
        map = pci_read_config32(ctrl->f2, DRAM_BANK_ADDR_MAP);
        map &= ~(0xf << (index * 4));
#if QRANK_DIMM_SUPPORT == 1
        if (sz->rank == 4) {
                map &= ~(0xf << ( (index + 2) * 4));
        }
#endif

        /* Make certain side1 of the dimm is at least 128MB */
        if (sz->per_rank >= 27) {
                unsigned temp_map;
                temp_map = cs_map_aaa[(sz->bank-2)*3*4 + (sz->rows - 13)*3 + (sz->col - 9) ];
                map |= temp_map << (index*4);
#if QRANK_DIMM_SUPPORT == 1
                if (sz->rank == 4) {
                        map |=  temp_map << ( (index + 2) * 4);
                }
#endif
        }

        pci_write_config32(ctrl->f2, DRAM_BANK_ADDR_MAP, map);

}


static long spd_set_ram_size(const struct mem_controller *ctrl,
                              struct mem_info *meminfo)
{
        int i;

        for (i = 0; i < DIMM_SOCKETS; i++) {
                struct dimm_size *sz = &(meminfo->sz[i]);
                u32 spd_device = ctrl->channel0[i];

                if (!(meminfo->dimm_mask & (1 << i))) {
                        if (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) { /* channelB only? */
                                spd_device = ctrl->channel1[i];
                        } else {
                                continue;
                        }
                }

                spd_get_dimm_size(spd_device, sz);
                if (sz->per_rank == 0) {
                        return -1; /* Report SPD error */
                }
                set_dimm_size(ctrl, sz, i, meminfo);
                set_dimm_cs_map(ctrl, sz, i, meminfo);
        }
        return meminfo->dimm_mask;
}

static void route_dram_accesses(const struct mem_controller *ctrl,
                                unsigned long base_k, unsigned long limit_k)
{
        /* Route the addresses to the controller node */
        unsigned node_id;
        unsigned limit;
        unsigned base;
        unsigned index;
        unsigned limit_reg, base_reg;
        device_t device;

        node_id = ctrl->node_id;
        index = (node_id << 3);
        limit = (limit_k << 2);
        limit &= 0xffff0000;
        limit -= 0x00010000;
        limit |= ( 0 << 8) | (node_id << 0);
        base = (base_k << 2);
        base &= 0xffff0000;
        base |= (0 << 8) | (1<<1) | (1<<0);

        limit_reg = 0x44 + index;
        base_reg = 0x40 + index;
        for (device = PCI_DEV(0, 0x18, 1); device <= PCI_DEV(0, 0x1f, 1);
             device += PCI_DEV(0, 1, 0)) {
                pci_write_config32(device, limit_reg, limit);
                pci_write_config32(device, base_reg, base);
        }
}

static void set_top_mem(unsigned tom_k, unsigned hole_startk)
{
        /* Error if I don't have memory */
        if (!tom_k) {
                die("No memory?");
        }

        /* Report the amount of memory. */
        printk_debug("RAM: 0x%08x kB\n", tom_k);

        /* Now set top of memory */
        msr_t msr;
        if (tom_k > (4*1024*1024)) {
                msr.lo = (tom_k & 0x003fffff) << 10;
                msr.hi = (tom_k & 0xffc00000) >> 22;
                wrmsr(TOP_MEM2, msr);
        }

        /* Leave a 64M hole between TOP_MEM and TOP_MEM2
         * so I can see my rom chip and other I/O devices.
         */
        if (tom_k >= 0x003f0000) {
#if HW_MEM_HOLE_SIZEK != 0
                if (hole_startk != 0) {
                        tom_k = hole_startk;
                } else
#endif
                tom_k = 0x3f0000;
        }
        msr.lo = (tom_k & 0x003fffff) << 10;
        msr.hi = (tom_k & 0xffc00000) >> 22;
        wrmsr(TOP_MEM, msr);
}

static unsigned long interleave_chip_selects(const struct mem_controller *ctrl, int is_Width128)
{
        /* 35 - 27 */

        static const uint8_t csbase_low_f0_shift[] = {
         /* 128MB */       (14 - (13-5)),
         /* 256MB */       (15 - (13-5)),
         /* 512MB */       (15 - (13-5)),
         /* 512MB */       (16 - (13-5)),
         /* 512MB */       (16 - (13-5)),
         /* 1GB   */       (16 - (13-5)),
         /* 1GB   */       (16 - (13-5)),
         /* 2GB   */       (16 - (13-5)),
         /* 2GB   */       (17 - (13-5)),
         /* 4GB   */       (17 - (13-5)),
         /* 4GB   */       (16 - (13-5)),
         /* 8GB   */       (17 - (13-5)),
        };

        /* cs_base_high is not changed */

        uint32_t csbase_inc;
        int chip_selects, index;
        int bits;
        unsigned common_size;
        unsigned common_cs_mode;
        uint32_t csbase, csmask;

        /* See if all of the memory chip selects are the same size
         * and if so count them.
         */
        chip_selects = 0;
        common_size = 0;
        common_cs_mode = 0xff;
        for (index = 0; index < 8; index++) {
                unsigned size;
                unsigned cs_mode;
                uint32_t value;

                value = pci_read_config32(ctrl->f2, DRAM_CSBASE + (index << 2));

                /* Is it enabled? */
                if (!(value & 1)) {
                        continue;
                }
                chip_selects++;
                size = (value >> 19) & 0x3ff;
                if (common_size == 0) {
                        common_size = size;
                }
                /* The size differed fail */
                if (common_size != size) {
                        return 0;
                }

                value = pci_read_config32(ctrl->f2, DRAM_BANK_ADDR_MAP);
                cs_mode =( value >> ((index>>1)*4)) & 0xf;
                if (common_cs_mode == 0xff) {
                        common_cs_mode = cs_mode;
                }
                /* The cs_mode differed fail */
                if (common_cs_mode != cs_mode) {
                        return 0;
                }
        }

        /* Chip selects can only be interleaved when there is
         * more than one and their is a power of two of them.
         */
        bits = log2(chip_selects);
        if (((1 << bits) != chip_selects) || (bits < 1) || (bits > 3)) {
                //chip_selects max = 8
                return 0;
        }

        /* Find the bits of csbase that we need to interleave on */
        csbase_inc = 1 << (csbase_low_f0_shift[common_cs_mode]);
        if (is_Width128) {
                csbase_inc <<=1;
        }

        /* Compute the initial values for csbase and csbask.
         * In csbase just set the enable bit and the base to zero.
         * In csmask set the mask bits for the size and page level interleave.
         */
        csbase = 0 | 1;
        csmask = (((common_size  << bits) - 1) << 19);
        csmask |= 0x3fe0 & ~((csbase_inc << bits) - csbase_inc);
        for (index = 0; index < 8; index++) {
                uint32_t value;

                value = pci_read_config32(ctrl->f2, DRAM_CSBASE + (index << 2));
                /* Is it enabled? */
                if (!(value & 1)) {
                        continue;
                }
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (index << 2), csbase);
                if ((index & 1) == 0) {  //only have 4 CSMASK
                        pci_write_config32(ctrl->f2, DRAM_CSMASK + ((index>>1) << 2), csmask);
                }
                csbase += csbase_inc;
        }

        printk_debug("Interleaved\n");

        /* Return the memory size in K */
        return common_size << ((27-10) + bits);
}

static unsigned long order_chip_selects(const struct mem_controller *ctrl)
{
        unsigned long tom;

        /* Remember which registers we have used in the high 8 bits of tom */
        tom = 0;
        for (;;) {
                /* Find the largest remaining canidate */
                unsigned index, canidate;
                uint32_t csbase, csmask;
                unsigned size;
                csbase = 0;
                canidate = 0;
                for (index = 0; index < 8; index++) {
                        uint32_t value;
                        value = pci_read_config32(ctrl->f2, DRAM_CSBASE + (index << 2));

                        /* Is it enabled? */
                        if (!(value & 1)) {
                                continue;
                        }

                        /* Is it greater? */
                        if (value <= csbase) {
                                continue;
                        }

                        /* Has it already been selected */
                        if (tom & (1 << (index + 24))) {
                                continue;
                        }
                        /* I have a new canidate */
                        csbase = value;
                        canidate = index;
                }
                
                /* See if I have found a new canidate */
                if (csbase == 0) {
                        break;
                }

                /* Remember the dimm size */
                size = csbase >> 19;

                /* Remember I have used this register */
                tom |= (1 << (canidate + 24));

                /* Recompute the cs base register value */
                csbase = (tom << 19) | 1;

                /* Increment the top of memory */
                tom += size;

                /* Compute the memory mask */
                csmask = ((size -1) << 19);
                csmask |= 0x3fe0;               /* For now don't optimize */

                /* Write the new base register */
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (canidate << 2), csbase);
                /* Write the new mask register */
                if ((canidate & 1) == 0) {  //only have 4 CSMASK
                        pci_write_config32(ctrl->f2, DRAM_CSMASK + ((canidate >> 1) << 2), csmask);
                }

        }
        /* Return the memory size in K */
        return (tom & ~0xff000000) << (27-10);
}

unsigned long memory_end_k(const struct mem_controller *ctrl, int max_node_id)
{
        unsigned node_id;
        unsigned end_k;
        /* Find the last memory address used */
        end_k = 0;
        for (node_id = 0; node_id < max_node_id; node_id++) {
                uint32_t limit, base;
                unsigned index;
                index = node_id << 3;
                base = pci_read_config32(ctrl->f1, 0x40 + index);
                /* Only look at the limit if the base is enabled */
                if ((base & 3) == 3) {
                        limit = pci_read_config32(ctrl->f1, 0x44 + index);
                        end_k = ((limit + 0x00010000) & 0xffff0000) >> 2;
                }
        }
        return end_k;
}

static void order_dimms(const struct mem_controller *ctrl,
                         struct mem_info *meminfo)
{
        unsigned long tom_k, base_k;

        if (read_option(CMOS_VSTART_interleave_chip_selects,
            CMOS_VLEN_interleave_chip_selects, 1) != 0) {
                tom_k = interleave_chip_selects(ctrl, meminfo->is_Width128);
        } else {
                printk_debug("Interleaving disabled\n");
                tom_k = 0;
        }

        if (!tom_k) {
                tom_k = order_chip_selects(ctrl);
        }

        /* Compute the memory base address */
        base_k = memory_end_k(ctrl, ctrl->node_id);
        tom_k += base_k;
        route_dram_accesses(ctrl, base_k, tom_k);
        set_top_mem(tom_k, 0);
}

static long disable_dimm(const struct mem_controller *ctrl, unsigned index,
                          struct mem_info *meminfo)
{
        printk_debug("disabling dimm %02x\n", index);
        if (!(meminfo->dimm_mask & 0x0F) && (meminfo->dimm_mask & 0xF0)) { /* channelB only? */
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 4) << 2), 0);
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 5) << 2), 0);
        } else {
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 0) << 2), 0);
                pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 1) << 2), 0);
#if QRANK_DIMM_SUPPORT == 1
                if (meminfo->sz[index].rank == 4) {
                        pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 4) << 2), 0);
                        pci_write_config32(ctrl->f2, DRAM_CSBASE + (((index << 1) + 5) << 2), 0);
                }
#endif
        }

        meminfo->dimm_mask &= ~(1 << index);
        return meminfo->dimm_mask;
}

static long spd_handle_unbuffered_dimms(const struct mem_controller *ctrl,
                                         struct mem_info *meminfo)
{
        int i;
        uint32_t registered;
        uint32_t dcl;
        registered = 0;
        for (i = 0; (i < DIMM_SOCKETS); i++) {
                int value;
                u32 spd_device = ctrl->channel0[i];
                if (!(meminfo->dimm_mask & (1 << i))) {
                        if (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) { /* channelB only? */
                                spd_device = ctrl->channel1[i];
                        } else {
                                continue;
                        }
                }
                value = spd_read_byte(spd_device, SPD_DIMM_TYPE);
                if (value < 0) {
                        return -1;
                }

                /* Registered dimm ? */
                value &= 0x3f;
                if ((value == SPD_DIMM_TYPE_RDIMM) || (value == SPD_DIMM_TYPE_mRDIMM)) {
                        //check SPD_MOD_ATTRIB to verify it is SPD_MOD_ATTRIB_REGADC (0x11)?
                        registered |= (1<<i);
                }
        }

        if (is_opteron(ctrl)) {
#if 0
                if ( registered != (meminfo->dimm_mask & ((1<<DIMM_SOCKETS)-1)) ) {
                        meminfo->dimm_mask &= (registered | (registered << DIMM_SOCKETS) ); //disable unbuffed dimm
//                      die("Mixed buffered and registered dimms not supported");
                }
                //By yhlu for debug M2, s1g1 can do dual channel, but it use unbuffer DIMM
                if (!registered) {
                        die("Unbuffered Dimms not supported on Opteron");
                }
#endif
        }


        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        dcl &= ~DCL_UnBuffDimm;
        meminfo->is_registered = 1;
        if (!registered) {
                dcl |= DCL_UnBuffDimm;
                meminfo->is_registered = 0;
        }
        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);

        if (meminfo->is_registered) {
                printk_spew("Registered\n");
        } else {
                printk_spew("Unbuffered\n");
        }
        return meminfo->dimm_mask;
}

static unsigned int spd_detect_dimms(const struct mem_controller *ctrl)
{
        unsigned dimm_mask;
        int i;
        dimm_mask = 0;
        for (i = 0; i < DIMM_SOCKETS; i++) {
                int byte;
                unsigned device;
                device = ctrl->channel0[i];
                printk_raminit("DIMM socket %i, channel 0 SPD device is 0x%02x\n", i, device);
                if (device) {
                        byte = spd_read_byte(ctrl->channel0[i], SPD_MEM_TYPE);  /* Type */
                        if (byte == SPD_MEM_TYPE_SDRAM_DDR2) {
                                dimm_mask |= (1 << i);
                        }
                }
                device = ctrl->channel1[i];
                printk_raminit("DIMM socket %i, channel 1 SPD device is 0x%02x\n", i, device);
                if (device) {
                        byte = spd_read_byte(ctrl->channel1[i], SPD_MEM_TYPE);
                        if (byte == SPD_MEM_TYPE_SDRAM_DDR2) {
                                dimm_mask |= (1 << (i + DIMM_SOCKETS));
                        }
                }
        }
        return dimm_mask;
}

static long spd_enable_2channels(const struct mem_controller *ctrl, struct mem_info *meminfo)
{
        int i;
        uint32_t nbcap;
        /* SPD addresses to verify are identical */
        static const uint8_t addresses[] = {
                2,      /* Type should be DDR2 SDRAM */
                3,      /* *Row addresses */
                4,      /* *Column addresses */
                5,      /* *Number of DIMM Ranks */
                6,      /* *Module Data Width*/
                11,     /* *DIMM Conf Type */
                13,     /* *Pri SDRAM Width */
                17,     /* *Logical Banks */
                20,     /* *DIMM Type Info */
                21,     /* *SDRAM Module Attributes */
                27,     /* *tRP Row precharge time */
                28,     /* *Minimum Row Active to Row Active Delay (tRRD) */
                29,     /* *tRCD RAS to CAS */
                30,     /* *tRAS Activate to Precharge */
                36,     /* *Write recovery time (tWR) */
                37,     /* *Internal write to read command delay (tRDP) */
                38,     /* *Internal read to precharge command delay (tRTP) */
                40,     /* *Extension of Byte 41 tRC and Byte 42 tRFC */
                41,     /* *Minimum Active to Active/Auto Refresh Time(Trc) */
                42,     /* *Minimum Auto Refresh Command Time(Trfc) */
                /* The SPD addresses 18, 9, 23, 26 need special treatment like
                 * in spd_set_memclk. Right now they cause many false negatives.
                 * Keep them at the end to see other mismatches (if any).
                 */
                18,     /* *Supported CAS Latencies */
                9,      /* *Cycle time at highest CAS Latency CL=X */
                23,     /* *Cycle time at CAS Latency (CLX - 1) */
                26,     /* *Cycle time at CAS Latency (CLX - 2) */
        };
        u32 dcl, dcm;
        u8 common_cl;

/* S1G1 and AM2 sockets are Mod64BitMux capable. */
#if CPU_SOCKET_TYPE == 0x11 || CPU_SOCKET_TYPE == 0x12
        u8 mux_cap = 1;
#else
        u8 mux_cap = 0;
#endif

        /* If the dimms are not in pairs do not do dual channels */
        if ((meminfo->dimm_mask & ((1 << DIMM_SOCKETS) - 1)) !=
                ((meminfo->dimm_mask >> DIMM_SOCKETS) & ((1 << DIMM_SOCKETS) - 1))) {
                goto single_channel;
        }
        /* If the cpu is not capable of doing dual channels don't do dual channels */
        nbcap = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
        if (!(nbcap & NBCAP_128Bit)) {
                goto single_channel;
        }
        for (i = 0; (i < 4) && (ctrl->channel0[i]); i++) {
                unsigned device0, device1;
                int value0, value1;
                int j;
                /* If I don't have a dimm skip this one */
                if (!(meminfo->dimm_mask & (1 << i))) {
                        continue;
                }
                device0 = ctrl->channel0[i];
                device1 = ctrl->channel1[i];
                /* Abort if the chips don't support a common CAS latency. */
                common_cl = spd_read_byte(device0, 18) & spd_read_byte(device1, 18);
                if (!common_cl) {
                        printk_debug("No common CAS latency supported\n");
                        goto single_channel;
                } else {
                        printk_raminit("Common CAS latency bitfield: 0x%02x\n", common_cl);
                }
                for (j = 0; j < ARRAY_SIZE(addresses); j++) {
                        unsigned addr;
                        addr = addresses[j];
                        value0 = spd_read_byte(device0, addr);
                        if (value0 < 0) {
                                return -1;
                        }
                        value1 = spd_read_byte(device1, addr);
                        if (value1 < 0) {
                                return -1;
                        }
                        if (value0 != value1) {
                                printk_raminit("SPD values differ between channel 0/1 for byte %i\n", addr);
                                goto single_channel;
                        }
                }
        }
        printk_spew("Enabling dual channel memory\n");
        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        dcl &= ~DCL_BurstLength32;  /*  32byte mode may be preferred in platforms that include graphics controllers that generate a lot of 32-bytes system memory accesses
                                        32byte mode is not supported when the DRAM interface is 128 bits wides, even 32byte mode is set, system still use 64 byte mode  */
        dcl |= DCL_Width128;
        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
        meminfo->is_Width128 = 1;
        return meminfo->dimm_mask;

 single_channel:
        meminfo->is_Width128 = 0;
        meminfo->is_64MuxMode = 0;

        /* single dimm */
        if ((meminfo->dimm_mask & ((1 << DIMM_SOCKETS) - 1)) !=
           ((meminfo->dimm_mask >> DIMM_SOCKETS) & ((1 << DIMM_SOCKETS) - 1))) {
                if (((meminfo->dimm_mask >> DIMM_SOCKETS) & ((1 << DIMM_SOCKETS) - 1))) {
                        /* mux capable and single dimm in channelB */
                        if (mux_cap) {
                                printk_spew("Enable 64MuxMode & BurstLength32\n");
                                dcm = pci_read_config32(ctrl->f2, DRAM_CTRL_MISC);
                                dcm |= DCM_Mode64BitMux;
                                pci_write_config32(ctrl->f2, DRAM_CTRL_MISC, dcm);
                                dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
                                //dcl |= DCL_BurstLength32; /* 32byte mode for channelB only */
                                pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
                                meminfo->is_64MuxMode = 1;
                        } else {
                                meminfo->dimm_mask &= ~((1 << (DIMM_SOCKETS * 2)) - (1 << DIMM_SOCKETS));
                        }
                }
        } else { /* unmatched dual dimms ? */
                /* unmatched dual dimms not supported by meminit code. Use single channelA dimm. */
                meminfo->dimm_mask &= ~((1 << (DIMM_SOCKETS * 2)) - (1 << DIMM_SOCKETS));
                printk_spew("Unmatched dual dimms. Use single channelA dimm.\n");
        }
        return meminfo->dimm_mask;
}

struct mem_param {
        uint16_t cycle_time;
        uint8_t divisor; /* In 1/40 ns increments */
        uint8_t TrwtTO;
        uint8_t Twrrd;
        uint8_t Twrwr;
        uint8_t Trdrd;
        uint8_t DcqByPassMax;
        uint32_t dch_memclk;
        char name[9];
};

        static const struct mem_param speed[] = {
                {
                        .name       = "200MHz",
                        .cycle_time = 0x500,
                        .divisor    = 200, // how many 1/40ns per clock
                        .dch_memclk = DCH_MemClkFreq_200MHz, //0
                        .TrwtTO     = 7,
                        .Twrrd      = 2,
                        .Twrwr      = 2,
                        .Trdrd      = 3,
                        .DcqByPassMax = 4,

                },
                {
                        .name       = "266MHz",
                        .cycle_time = 0x375,
                        .divisor    = 150, //????
                        .dch_memclk = DCH_MemClkFreq_266MHz, //1
                        .TrwtTO     = 7,
                        .Twrrd      = 2,
                        .Twrwr      = 2,
                        .Trdrd      = 3,
                        .DcqByPassMax = 4,
                },
                 {
                        .name       = "333MHz",
                        .cycle_time = 0x300,
                        .divisor    = 120,
                        .dch_memclk = DCH_MemClkFreq_333MHz, //2
                        .TrwtTO     = 7,
                        .Twrrd      = 2,
                        .Twrwr      = 2,
                        .Trdrd      = 3,
                        .DcqByPassMax = 4,

                 },
                {
                        .name       = "400MHz",
                        .cycle_time = 0x250,
                        .divisor    = 100,
                        .dch_memclk = DCH_MemClkFreq_400MHz,//3
                        .TrwtTO     = 7,
                        .Twrrd      = 2,
                        .Twrwr      = 2,
                        .Trdrd      = 3,
                        .DcqByPassMax = 4,
                },
                {
                        .cycle_time = 0x000,
                },
        };

static const struct mem_param *get_mem_param(unsigned min_cycle_time)
{

        const struct mem_param *param;
        for (param = &speed[0]; param->cycle_time ; param++) {
                if (min_cycle_time > (param+1)->cycle_time) {
                        break;
                }
        }
        if (!param->cycle_time) {
                die("min_cycle_time to low");
        }
        printk_spew("%s\n", param->name);
        return param;
}

static uint8_t get_exact_divisor(int i, uint8_t divisor)
{
        //input divisor could be 200(200), 150(266), 120(333), 100 (400)
        static const uint8_t dv_a[] = {
               /* 200  266  333  400 */
         /*4 */   250, 250, 250, 250,
         /*5 */   200, 200, 200, 100,
         /*6 */   200, 166, 166, 100,
         /*7 */   200, 171, 142, 100,

          /*8 */   200, 150, 125, 100,
          /*9 */   200, 156, 133, 100,
          /*10*/   200, 160, 120, 100,
          /*11*/   200, 163, 127, 100,

          /*12*/   200, 150, 133, 100,
          /*13*/   200, 153, 123, 100,
          /*14*/   200, 157, 128, 100,
          /*15*/   200, 160, 120, 100,
        };

        
        int index;
        msr_t msr;

        /* Check for FID control support */
        struct cpuid_result cpuid1;
        cpuid1 = cpuid(0x80000007);
        if( cpuid1.edx & 0x02 ) {
                /* Use current FID */
                unsigned fid_cur;
                msr = rdmsr(0xc0010042);
                fid_cur = msr.lo & 0x3f;

                index = fid_cur>>1;
        } else {
                /* Use startup FID */
                unsigned fid_start;
                msr = rdmsr(0xc0010015);
                fid_start = (msr.lo & (0x3f << 24));
                
                index = fid_start>>25;
        }

        if (index>12) return divisor;

        if (i>3) return divisor;

        return dv_a[index * 4+i];

}


struct spd_set_memclk_result {
        const struct mem_param *param;
        long dimm_mask;
};


static unsigned convert_to_linear(unsigned value)
{
        static const unsigned fraction[] = { 0x25, 0x33, 0x66, 0x75 };
        unsigned valuex;

        /* We need to convert value to more readable */
        if ((value & 0xf) < 10) { //no .25, .33, .66, .75
                value <<= 4;
        } else {
                valuex = ((value & 0xf0) << 4) | fraction [(value & 0xf)-10];
                value = valuex;
        }
        return value;
}

static const uint8_t latency_indicies[] = { 25, 23, 9 };

int find_optimum_spd_latency(u32 spd_device, unsigned *min_latency, unsigned *min_cycle_time)
{
        int new_cycle_time, new_latency;
        int index;
        int latencies;
        int latency;

        /* First find the supported CAS latencies
         * Byte 18 for DDR SDRAM is interpreted:
         * bit 3 == CAS Latency = 3
         * bit 4 == CAS Latency = 4
         * bit 5 == CAS Latency = 5
         * bit 6 == CAS Latency = 6
         */
        new_cycle_time = 0x500;
        new_latency = 6;

        latencies = spd_read_byte(spd_device, SPD_CAS_LAT);
        if (latencies <= 0)
                return 1;

        printk_raminit("\tlatencies: %08x\n", latencies);
        /* Compute the lowest cas latency which can be expressed in this
         * particular SPD EEPROM. You can store at most settings for 3
         * contiguous CAS latencies, so by taking the highest CAS
         * latency maked as supported in the SPD and subtracting 2 you
         * get the lowest expressable CAS latency. That latency is not
         * necessarily supported, but a (maybe invalid) entry exists
         * for it.
         */
        latency = log2(latencies) - 2;

        /* Loop through and find a fast clock with a low latency */
        for (index = 0; index < 3; index++, latency++) {
                int value;
                if ((latency < 3) || (latency > 6) ||
                        (!(latencies & (1 << latency)))) {
                        continue;
                }
                value = spd_read_byte(spd_device, latency_indicies[index]);
                if (value < 0) {
                        return -1;
                }

                printk_raminit("\tindex: %08x\n", index);
                printk_raminit("\t\tlatency: %08x\n", latency);
                printk_raminit("\t\tvalue1: %08x\n", value);

                value = convert_to_linear(value);

                printk_raminit("\t\tvalue2: %08x\n", value);

                /* Only increase the latency if we decrease the clock */
                if (value >= *min_cycle_time ) {
                        if (value < new_cycle_time) {
                                new_cycle_time = value;
                                new_latency = latency;
                        } else if (value == new_cycle_time) {
                                if (new_latency > latency) {
                                        new_latency = latency;
                                }
                        }
                }
                printk_raminit("\t\tnew_cycle_time: %08x\n", new_cycle_time);
                printk_raminit("\t\tnew_latency: %08x\n", new_latency);

        }

        if (new_latency > 6){
                return 1;
        }

        /* Does min_latency need to be increased? */
        if (new_cycle_time > *min_cycle_time) {
                *min_cycle_time = new_cycle_time;
        }

        /* Does min_cycle_time need to be increased? */
        if (new_latency > *min_latency) {
                *min_latency = new_latency;
        }

        printk_raminit("2 min_cycle_time: %08x\n", *min_cycle_time);
        printk_raminit("2 min_latency: %08x\n", *min_latency);

        return 0;
}

static struct spd_set_memclk_result spd_set_memclk(const struct mem_controller *ctrl, struct mem_info *meminfo)
{
        /* Compute the minimum cycle time for these dimms */
        struct spd_set_memclk_result result;
        unsigned min_cycle_time, min_latency, bios_cycle_time;
        int i;
        uint32_t value;

        static const uint16_t min_cycle_times[] = { // use full speed to compare
                [NBCAP_MEMCLK_NOLIMIT] = 0x250, /*2.5ns */
                [NBCAP_MEMCLK_333MHZ] = 0x300, /* 3.0ns */
                [NBCAP_MEMCLK_266MHZ] = 0x375, /* 3.75ns */
                [NBCAP_MEMCLK_200MHZ] = 0x500, /* 5.0s */
        };


        value = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
        min_cycle_time = min_cycle_times[(value >> NBCAP_MEMCLK_SHIFT) & NBCAP_MEMCLK_MASK];
        bios_cycle_time = min_cycle_times[
                read_option(CMOS_VSTART_max_mem_clock, CMOS_VLEN_max_mem_clock, 0)];
        if (bios_cycle_time > min_cycle_time) {
                min_cycle_time = bios_cycle_time;
        }
        min_latency = 3;

        printk_raminit("1 min_cycle_time: %08x\n", min_cycle_time);

        /* Compute the least latency with the fastest clock supported
         * by both the memory controller and the dimms.
         */
        for (i = 0; i < DIMM_SOCKETS; i++) {
                u32 spd_device;

                printk_raminit("1.1 dimm_mask: %08x\n", meminfo->dimm_mask);
                printk_raminit("i: %08x\n",i);

                if (meminfo->dimm_mask & (1 << i)) {
                        spd_device = ctrl->channel0[i];
                        printk_raminit("Channel 0 settings:\n");

                        switch (find_optimum_spd_latency(spd_device, &min_latency, &min_cycle_time)) {
                        case -1:
                                goto hw_error;
                                break;
                        case 1:
                                continue;
                        }
                }
                if (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) {
                        spd_device = ctrl->channel1[i];
                        printk_raminit("Channel 1 settings:\n");

                        switch (find_optimum_spd_latency(spd_device, &min_latency, &min_cycle_time)) {
                        case -1:
                                goto hw_error;
                                break;
                        case 1:
                                continue;
                        }
                }
                
        }
        /* Make a second pass through the dimms and disable
         * any that cannot support the selected memclk and cas latency.
         */

        printk_raminit("3 min_cycle_time: %08x\n", min_cycle_time);
        printk_raminit("3 min_latency: %08x\n", min_latency);

        for (i = 0; (i < DIMM_SOCKETS); i++) {
                int latencies;
                int latency;
                int index;
                int value;
                u32 spd_device = ctrl->channel0[i];

                if (!(meminfo->dimm_mask & (1 << i))) {
                        if (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) { /* channelB only? */
                                spd_device = ctrl->channel1[i];
                        } else {
                                continue;
                        }
                }

                latencies = spd_read_byte(spd_device, SPD_CAS_LAT);
                if (latencies < 0) goto hw_error;
                if (latencies == 0) {
                        continue;
                }

                /* Compute the lowest cas latency supported */
                latency = log2(latencies) -2;

                /* Walk through searching for the selected latency */
                for (index = 0; index < 3; index++, latency++) {
                        if (!(latencies & (1 << latency))) {
                                continue;
                        }
                        if (latency == min_latency)
                                break;
                }
                /* If I can't find the latency or my index is bad error */
                if ((latency != min_latency) || (index >= 3)) {
                        goto dimm_err;
                }

                /* Read the min_cycle_time for this latency */
                value = spd_read_byte(spd_device, latency_indicies[index]);
                if (value < 0) goto hw_error;

                value = convert_to_linear(value);
                /* All is good if the selected clock speed
                 * is what I need or slower.
                 */
                if (value <= min_cycle_time) {
                        continue;
                }
                /* Otherwise I have an error, disable the dimm */
        dimm_err:
                meminfo->dimm_mask = disable_dimm(ctrl, i, meminfo);
        }

        printk_raminit("4 min_cycle_time: %08x\n", min_cycle_time);

        /* Now that I know the minimum cycle time lookup the memory parameters */
        result.param = get_mem_param(min_cycle_time);

        /* Update DRAM Config High with our selected memory speed */
        value = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);
        value &= ~(DCH_MemClkFreq_MASK << DCH_MemClkFreq_SHIFT);

        value |= result.param->dch_memclk << DCH_MemClkFreq_SHIFT;
        pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, value);

        printk_debug("%s\n", result.param->name);

        /* Update DRAM Timing Low with our selected cas latency */
        value = pci_read_config32(ctrl->f2, DRAM_TIMING_LOW);
        value &= ~(DTL_TCL_MASK << DTL_TCL_SHIFT);
        value |= (min_latency - DTL_TCL_BASE)  << DTL_TCL_SHIFT;
        pci_write_config32(ctrl->f2, DRAM_TIMING_LOW, value);

        result.dimm_mask = meminfo->dimm_mask;
        return result;
 hw_error:
        result.param = (const struct mem_param *)0;
        result.dimm_mask = -1;
        return result;
}

static unsigned convert_to_1_4(unsigned value)
{
        static const uint8_t fraction[] = { 0, 1, 2, 2, 3, 3, 0 };
        unsigned valuex;

        /* We need to convert value to more readable */
        valuex =  fraction [value & 0x7];
        return valuex;
}

int get_dimm_Trc_clocks(u32 spd_device, const struct mem_param *param)
{
        int value;
        int value2;
        int clocks;
        value = spd_read_byte(spd_device, SPD_TRC);
        if (value < 0)
                return -1;
        printk_raminit("update_dimm_Trc: tRC (41) = %08x\n", value);

        value2 = spd_read_byte(spd_device, SPD_TRC -1);
        value <<= 2;
        value += convert_to_1_4(value2>>4);

        value *= 10;
        printk_raminit("update_dimm_Trc: tRC final value = %i\n", value);

        clocks = (value + param->divisor - 1)/param->divisor;
        printk_raminit("update_dimm_Trc: clocks = %i\n", clocks);

        if (clocks < DTL_TRC_MIN) {
#warning We should die here or at least disable this bank.
                printk_notice("update_dimm_Trc: can't refresh fast enough, "
                        "want %i clocks, can %i clocks\n", clocks, DTL_TRC_MIN);
                clocks = DTL_TRC_MIN;
        }
        return clocks;
}

static int update_dimm_Trc(const struct mem_controller *ctrl,
                            const struct mem_param *param,
                            int i, long dimm_mask)
{
        int clocks, old_clocks;
        uint32_t dtl;
        u32 spd_device = ctrl->channel0[i];

        if (!(dimm_mask & (1 << i)) && (dimm_mask & (1 << (DIMM_SOCKETS + i)))) { /* channelB only? */
                spd_device = ctrl->channel1[i];
        }

        clocks = get_dimm_Trc_clocks(spd_device, param);
        if (clocks == -1)
                return clocks;
        if (clocks > DTL_TRC_MAX) {
                return 0;
        }
        printk_raminit("update_dimm_Trc: clocks after adjustment = %i\n", clocks);

        dtl = pci_read_config32(ctrl->f2, DRAM_TIMING_LOW);
        old_clocks = ((dtl >> DTL_TRC_SHIFT) & DTL_TRC_MASK) + DTL_TRC_BASE;
        if (old_clocks >= clocks) {  //?? someone did it
                // clocks = old_clocks;
                return 1;
        }
        dtl &= ~(DTL_TRC_MASK << DTL_TRC_SHIFT);
        dtl |=  ((clocks - DTL_TRC_BASE) << DTL_TRC_SHIFT);
        pci_write_config32(ctrl->f2, DRAM_TIMING_LOW, dtl);
        return 1;
}

static int update_dimm_Trfc(const struct mem_controller *ctrl, const struct mem_param *param, int i, struct mem_info *meminfo)
{
        unsigned clocks, old_clocks;
        uint32_t dth;
        int value;
        u8 ch_b = 0;
        u32 spd_device = ctrl->channel0[i];

        if (!(meminfo->dimm_mask & (1 << i)) && (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i)))) { /* channelB only? */
                spd_device = ctrl->channel1[i];
                ch_b = 2; /* offset to channelB trfc setting */
        }

        //get the cs_size --> logic dimm size
        value = spd_read_byte(spd_device, SPD_PRI_WIDTH);
        if (value < 0) {
                return -1;
        }

        value = 6 - log2(value); //4-->4, 8-->3, 16-->2

        clocks = meminfo->sz[i].per_rank - 27 + 2 - value;

        dth = pci_read_config32(ctrl->f2, DRAM_TIMING_HIGH);

        old_clocks = ((dth >> (DTH_TRFC0_SHIFT + ((i + ch_b) * 3))) & DTH_TRFC_MASK);

        if (old_clocks >= clocks) { // some one did it?
                return 1;
        }
        dth &= ~(DTH_TRFC_MASK << (DTH_TRFC0_SHIFT + ((i + ch_b) * 3)));
        dth |= clocks  << (DTH_TRFC0_SHIFT + ((i + ch_b) * 3));
        pci_write_config32(ctrl->f2, DRAM_TIMING_HIGH, dth);
        return 1;
}

static int update_dimm_TT_1_4(const struct mem_controller *ctrl, const struct mem_param *param, int i, long dimm_mask,
                                        unsigned TT_REG,
                                        unsigned SPD_TT, unsigned TT_SHIFT, unsigned TT_MASK, unsigned TT_BASE, unsigned TT_MIN, unsigned TT_MAX )
{
        unsigned clocks, old_clocks;
        uint32_t dtl;
        int value;
        u32 spd_device = ctrl->channel0[i];

        if (!(dimm_mask & (1 << i)) && (dimm_mask & (1 << (DIMM_SOCKETS + i)))) { /* channelB only? */
                spd_device = ctrl->channel1[i];
        }

        value = spd_read_byte(spd_device, SPD_TT); //already in 1/4 ns
        if (value < 0) return -1;
        value *=10;
        clocks = (value + param->divisor -1)/param->divisor;
        if (clocks < TT_MIN) {
                clocks = TT_MIN;
        }
        
        if (clocks > TT_MAX) {
                printk_info("warning spd byte : %x = %x > TT_MAX: %x, setting TT_MAX", SPD_TT, value, TT_MAX);
                clocks = TT_MAX;
        }

        dtl = pci_read_config32(ctrl->f2, TT_REG);

        old_clocks = ((dtl >> TT_SHIFT) & TT_MASK) + TT_BASE;
        if (old_clocks >= clocks) { //some one did it?
//              clocks = old_clocks;
                return 1;
        }
        dtl &= ~(TT_MASK << TT_SHIFT);
        dtl |= ((clocks - TT_BASE) << TT_SHIFT);
        pci_write_config32(ctrl->f2, TT_REG, dtl);
        return 1;
}

static int update_dimm_Trcd(const struct mem_controller *ctrl,
                             const struct mem_param *param, int i, long dimm_mask)
{
        return update_dimm_TT_1_4(ctrl, param, i, dimm_mask, DRAM_TIMING_LOW, SPD_TRCD, DTL_TRCD_SHIFT, DTL_TRCD_MASK, DTL_TRCD_BASE, DTL_TRCD_MIN, DTL_TRCD_MAX);
}

static int update_dimm_Trrd(const struct mem_controller *ctrl, const struct mem_param *param, int i, long dimm_mask)
{
        return update_dimm_TT_1_4(ctrl, param, i, dimm_mask, DRAM_TIMING_LOW, SPD_TRRD, DTL_TRRD_SHIFT, DTL_TRRD_MASK, DTL_TRRD_BASE, DTL_TRRD_MIN, DTL_TRRD_MAX);
}

static int update_dimm_Tras(const struct mem_controller *ctrl, const struct mem_param *param, int i, long dimm_mask)
{
        unsigned clocks, old_clocks;
        uint32_t dtl;
        int value;
        u32 spd_device = ctrl->channel0[i];

        if (!(dimm_mask & (1 << i)) && (dimm_mask & (1 << (DIMM_SOCKETS + i)))) { /* channelB only? */
                spd_device = ctrl->channel1[i];
        }

        value = spd_read_byte(spd_device, SPD_TRAS); //in 1 ns
        if (value < 0) return -1;
        printk_raminit("update_dimm_Tras: 0 value= %08x\n", value);

        value <<= 2; //convert it to in 1/4ns

        value *= 10;
        printk_raminit("update_dimm_Tras:  1 value= %08x\n", value);

        clocks = (value  + param->divisor - 1)/param->divisor;
        printk_raminit("update_dimm_Tras: divisor= %08x\n", param->divisor);
        printk_raminit("update_dimm_Tras: clocks= %08x\n", clocks);
        if (clocks < DTL_TRAS_MIN) {
                clocks = DTL_TRAS_MIN;
        }
        if (clocks > DTL_TRAS_MAX) {
                return 0;
        }
        dtl = pci_read_config32(ctrl->f2, DRAM_TIMING_LOW);
        old_clocks = ((dtl >> DTL_TRAS_SHIFT) & DTL_TRAS_MASK) + DTL_TRAS_BASE;
        if (old_clocks >= clocks) { // someone did it?
                return 1;
        }
        dtl &= ~(DTL_TRAS_MASK << DTL_TRAS_SHIFT);
        dtl |= ((clocks - DTL_TRAS_BASE) << DTL_TRAS_SHIFT);
        pci_write_config32(ctrl->f2, DRAM_TIMING_LOW, dtl);
        return 1;
}

static int update_dimm_Trp(const struct mem_controller *ctrl,
                            const struct mem_param *param, int i, long dimm_mask)
{
        return update_dimm_TT_1_4(ctrl, param, i, dimm_mask, DRAM_TIMING_LOW, SPD_TRP, DTL_TRP_SHIFT, DTL_TRP_MASK, DTL_TRP_BASE, DTL_TRP_MIN, DTL_TRP_MAX);
}


static int update_dimm_Trtp(const struct mem_controller *ctrl,
                const struct mem_param *param, int i, struct mem_info *meminfo)
{
        /* need to figure if it is 32 byte burst or 64 bytes burst */
        int offset = 2;
        if (!meminfo->is_Width128) {
                uint32_t dword;
                dword = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
                if ((dword &  DCL_BurstLength32)) offset = 0;
        }
        return update_dimm_TT_1_4(ctrl, param, i, meminfo->dimm_mask, DRAM_TIMING_LOW, SPD_TRTP, DTL_TRTP_SHIFT, DTL_TRTP_MASK, DTL_TRTP_BASE+offset, DTL_TRTP_MIN+offset, DTL_TRTP_MAX+offset);
}


static int update_dimm_Twr(const struct mem_controller *ctrl, const struct mem_param *param, int i, long dimm_mask)
{
        return update_dimm_TT_1_4(ctrl, param, i, dimm_mask, DRAM_TIMING_LOW, SPD_TWR, DTL_TWR_SHIFT, DTL_TWR_MASK, DTL_TWR_BASE, DTL_TWR_MIN, DTL_TWR_MAX);
}


static int update_dimm_Tref(const struct mem_controller *ctrl,
                             const struct mem_param *param, int i, long dimm_mask)
{
        uint32_t dth, dth_old;
        int value;
        u32 spd_device = ctrl->channel0[i];

        if (!(dimm_mask & (1 << i)) && (dimm_mask & (1 << (DIMM_SOCKETS + i)))) { /* channelB only? */
                spd_device = ctrl->channel1[i];
        }

        value = spd_read_byte(spd_device, SPD_TREF); // 0: 15.625us, 1: 3.9us 2: 7.8 us....
        if (value < 0) return -1;

        if (value == 1 ) {
                value = 3;
        } else {
                value = 2;
        }

        dth = pci_read_config32(ctrl->f2, DRAM_TIMING_HIGH);

        dth_old = dth;
        dth &= ~(DTH_TREF_MASK << DTH_TREF_SHIFT);
        dth |= (value << DTH_TREF_SHIFT);
        if (dth_old != dth) {
                pci_write_config32(ctrl->f2, DRAM_TIMING_HIGH, dth);
        }
        return 1;
}

static void set_4RankRDimm(const struct mem_controller *ctrl,
                        const struct mem_param *param, struct mem_info *meminfo)
{
#if QRANK_DIMM_SUPPORT == 1
        int value;
        int i;
        long dimm_mask = meminfo->dimm_mask;


        if (!(meminfo->is_registered)) return;

        value = 0;

        for (i = 0; i < DIMM_SOCKETS; i++) {
                if (!(dimm_mask & (1 << i))) {
                        continue;
                }

                if (meminfo->sz[i].rank == 4) {
                        value = 1;
                        break;
                }
        }

        if (value == 1) {
                uint32_t dch;
                dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);
                dch |= DCH_FourRankRDimm;
                pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, dch);
        }
#endif
}

static uint32_t get_extra_dimm_mask(const struct mem_controller *ctrl,
                                     struct mem_info *meminfo)
{
        int i;

        uint32_t mask_x4;
        uint32_t mask_x16;
        uint32_t mask_single_rank;
        uint32_t mask_page_1k;
        int value;
#if QRANK_DIMM_SUPPORT == 1
        int rank;
#endif

        long dimm_mask = meminfo->dimm_mask;


        mask_x4 = 0;
        mask_x16 = 0;
        mask_single_rank = 0;
        mask_page_1k = 0;

        for (i = 0; i < DIMM_SOCKETS; i++) {
                u32 spd_device = ctrl->channel0[i];
                if (!(dimm_mask & (1 << i))) {
                        if (dimm_mask & (1 << (DIMM_SOCKETS + i))) { /* channelB only? */
                                spd_device = ctrl->channel1[i];
                        } else {
                                continue;
                        }
                }

                if (meminfo->sz[i].rank == 1) {
                        mask_single_rank |= 1<<i;
                }

                if (meminfo->sz[i].col==10) {
                        mask_page_1k |= 1<<i;
                }


                value = spd_read_byte(spd_device, SPD_PRI_WIDTH);

                #if QRANK_DIMM_SUPPORT == 1
                        rank = meminfo->sz[i].rank;
                #endif

                if (value==4) {
                        mask_x4 |= (1<<i);
                        #if QRANK_DIMM_SUPPORT == 1
                        if (rank==4) {
                                mask_x4 |= 1<<(i+2);
                        }
                        #endif
                } else if (value==16) {
                        mask_x16 |= (1<<i);
                        #if QRANK_DIMM_SUPPORT == 1
                         if (rank==4) {
                                 mask_x16 |= 1<<(i+2);
                         }
                        #endif
                }

        }

        meminfo->x4_mask= mask_x4;
        meminfo->x16_mask = mask_x16;

        meminfo->single_rank_mask = mask_single_rank;
        meminfo->page_1k_mask = mask_page_1k;

        return mask_x4;

}


static void set_dimm_x4(const struct mem_controller *ctrl, const struct mem_param *param, struct mem_info *meminfo)
{
        uint32_t dcl;
        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        dcl &= ~(DCL_X4Dimm_MASK<<DCL_X4Dimm_SHIFT);
        dcl |= ((meminfo->x4_mask) & 0xf) << (DCL_X4Dimm_SHIFT);
        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
}


static int count_ones(uint32_t dimm_mask)
{
        int dimms;
        unsigned index;
        dimms = 0;
        for (index = 0; index < (2 * DIMM_SOCKETS); index++, dimm_mask >>= 1) {
                if (dimm_mask & 1) {
                        dimms++;
                }
        }
        return dimms;
}


static void set_DramTerm(const struct mem_controller *ctrl,
                        const struct mem_param *param, struct mem_info *meminfo)
{
        uint32_t dcl;
        unsigned odt;
        odt = 1; // 75 ohms

        if (param->divisor == 100) { //DDR2 800
                if (meminfo->is_Width128) {
                        if (count_ones(meminfo->dimm_mask & 0x0f)==2) {
                                odt = 3;  //50 ohms
                        }
                }

        }


#if DIMM_SUPPORT == 0x0204
        odt = 0x2;              /* 150 ohms */
#endif

        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        dcl &= ~(DCL_DramTerm_MASK<<DCL_DramTerm_SHIFT);
        dcl |= (odt & DCL_DramTerm_MASK) << (DCL_DramTerm_SHIFT);
        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
}

static void set_ecc(const struct mem_controller *ctrl,
        const struct mem_param *param, struct mem_info *meminfo)
{
        int i;
        int value;

        uint32_t dcl, nbcap;
        nbcap = pci_read_config32(ctrl->f3, NORTHBRIDGE_CAP);
        dcl = pci_read_config32(ctrl->f2, DRAM_CONFIG_LOW);
        dcl &= ~DCL_DimmEccEn;
        if (nbcap & NBCAP_ECC) {
                dcl |= DCL_DimmEccEn;
        }
        if (read_option(CMOS_VSTART_ECC_memory, CMOS_VLEN_ECC_memory, 1) == 0) {
                dcl &= ~DCL_DimmEccEn;
        }
        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);

        meminfo->is_ecc = 1;
        if (!(dcl & DCL_DimmEccEn)) {
                meminfo->is_ecc = 0;
                return; // already disabled the ECC, so don't need to read SPD any more
        }

        for (i = 0; i < DIMM_SOCKETS; i++) {
                u32 spd_device = ctrl->channel0[i];
                if (!(meminfo->dimm_mask & (1 << i))) {
                        if (meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) { /* channelB only? */
                                spd_device = ctrl->channel1[i];
                                printk_debug("set_ecc spd_device: 0x%x\n", spd_device);
                        } else {
                                continue;
                        }
                }

                value = spd_read_byte(ctrl->channel0[i], SPD_DIMM_CONF_TYPE);

                if (!(value & SPD_DIMM_CONF_TYPE_ECC)) {
                        dcl &= ~DCL_DimmEccEn;
                        pci_write_config32(ctrl->f2, DRAM_CONFIG_LOW, dcl);
                        meminfo->is_ecc = 0;
                        return;
                }

        }
}


static int update_dimm_Twtr(const struct mem_controller *ctrl,
                             const struct mem_param *param, int i, long dimm_mask)
{
        return update_dimm_TT_1_4(ctrl, param, i, dimm_mask, DRAM_TIMING_HIGH, SPD_TWTR, DTH_TWTR_SHIFT, DTH_TWTR_MASK, DTH_TWTR_BASE, DTH_TWTR_MIN, DTH_TWTR_MAX);
}

static void set_TT(const struct mem_controller *ctrl,
        const struct mem_param *param, unsigned TT_REG, unsigned TT_SHIFT,
        unsigned TT_MASK, unsigned TT_BASE, unsigned TT_MIN, unsigned TT_MAX,
        unsigned val, const char *str)
{
        uint32_t reg;

        if ((val < TT_MIN) || (val > TT_MAX)) {
                printk_err(str);
                die(" Unknown\n");
        }

        reg = pci_read_config32(ctrl->f2, TT_REG);
        reg &= ~(TT_MASK << TT_SHIFT);
        reg |= ((val - TT_BASE) << TT_SHIFT);
        pci_write_config32(ctrl->f2, TT_REG, reg);
        return;
}


static void set_TrwtTO(const struct mem_controller *ctrl,
                        const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_TIMING_HIGH, DTH_TRWTTO_SHIFT, DTH_TRWTTO_MASK,DTH_TRWTTO_BASE, DTH_TRWTTO_MIN, DTH_TRWTTO_MAX, param->TrwtTO, "TrwtTO");
}


static void set_Twrrd(const struct mem_controller *ctrl, const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_TIMING_HIGH, DTH_TWRRD_SHIFT, DTH_TWRRD_MASK,DTH_TWRRD_BASE, DTH_TWRRD_MIN, DTH_TWRRD_MAX, param->Twrrd, "Twrrd");
}


static void set_Twrwr(const struct mem_controller *ctrl, const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_TIMING_HIGH, DTH_TWRWR_SHIFT, DTH_TWRWR_MASK,DTH_TWRWR_BASE, DTH_TWRWR_MIN, DTH_TWRWR_MAX, param->Twrwr, "Twrwr");
}

static void set_Trdrd(const struct mem_controller *ctrl, const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_TIMING_HIGH, DTH_TRDRD_SHIFT, DTH_TRDRD_MASK,DTH_TRDRD_BASE, DTH_TRDRD_MIN, DTH_TRDRD_MAX, param->Trdrd, "Trdrd");
}

static void set_DcqBypassMax(const struct mem_controller *ctrl, const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_CONFIG_HIGH, DCH_DcqBypassMax_SHIFT, DCH_DcqBypassMax_MASK,DCH_DcqBypassMax_BASE, DCH_DcqBypassMax_MIN, DCH_DcqBypassMax_MAX, param->DcqByPassMax, "DcqBypassMax"); // value need to be in CMOS
}

static void set_Tfaw(const struct mem_controller *ctrl, const struct mem_param *param, struct mem_info *meminfo)
{
        static const uint8_t faw_1k[] = {8, 10, 13, 14};
        static const uint8_t faw_2k[] = {10, 14, 17, 18};
        unsigned memclkfreq_index;
        unsigned faw;


        memclkfreq_index = param->dch_memclk;

        if (meminfo->page_1k_mask != 0) { //1k page
                faw = faw_1k[memclkfreq_index];
        } else {
                faw = faw_2k[memclkfreq_index];
        }

        set_TT(ctrl, param, DRAM_CONFIG_HIGH, DCH_FourActWindow_SHIFT, DCH_FourActWindow_MASK, DCH_FourActWindow_BASE, DCH_FourActWindow_MIN, DCH_FourActWindow_MAX, faw, "FourActWindow");
}

static void set_max_async_latency(const struct mem_controller *ctrl, const struct mem_param *param)
{
        uint32_t dch;
        unsigned async_lat;


        dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);
        dch &= ~(DCH_MaxAsyncLat_MASK << DCH_MaxAsyncLat_SHIFT);

        //FIXME: We need to use Max of DqsRcvEnDelay + 6ns here: After trainning and get that from index reg 0x10, 0x13, 0x16, 0x19, 0x30, 0x33, 0x36, 0x39
        async_lat = 6 + 6;


        dch |= ((async_lat - DCH_MaxAsyncLat_BASE) << DCH_MaxAsyncLat_SHIFT);
        pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, dch);
}

static void set_SlowAccessMode(const struct mem_controller *ctrl)
{
        uint32_t dch;

        dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);

        dch |= (1<<20);

        pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, dch);
}

/*
        DRAM_OUTPUT_DRV_COMP_CTRL 0, 0x20
        DRAM_ADDR_TIMING_CTRL 04, 0x24
*/
static void set_misc_timing(const struct mem_controller *ctrl, struct mem_info *meminfo)
{
        uint32_t dword;
        uint32_t dwordx;
        unsigned SlowAccessMode = 0;

        long dimm_mask = meminfo->dimm_mask & 0x0f;

#if DIMM_SUPPORT==0x0104   /* DDR2 and REG */
        /* for REG DIMM */
        dword = 0x00111222;
        dwordx = 0x002f0000;
        switch (meminfo->memclk_set) {
        case DCH_MemClkFreq_266MHz:
                if ( (dimm_mask == 0x03) || (dimm_mask == 0x02) || (dimm_mask == 0x01)) {
                        dwordx = 0x002f2700;
                }
                break;
        case DCH_MemClkFreq_333MHz:
                if ( (dimm_mask == 0x03) || (dimm_mask == 0x02) || (dimm_mask == 0x01)) {
                        if ((meminfo->single_rank_mask & 0x03)!=0x03) { //any double rank there?
                                dwordx = 0x002f2f00;
                        }
                }
                break;
        case DCH_MemClkFreq_400MHz:
                dwordx = 0x002f3300;
                break;
        }

#endif

#if DIMM_SUPPORT==0x0204        /* DDR2 and SO-DIMM, S1G1 */
        dword = 0x00111222;
        dwordx = 0x002F2F00;

        switch (meminfo->memclk_set) {
        case DCH_MemClkFreq_200MHz:     /* nothing to be set here */
                break;
        case DCH_MemClkFreq_266MHz:
                if ((meminfo->single_rank_mask == 0)
                    && (meminfo->x4_mask == 0) && (meminfo->x16_mask))
                        dwordx = 0x002C2C00;    /* Double rank x8 */
                /* else SRx16, SRx8, DRx16 == 0x002F2F00 */
                break;
        case DCH_MemClkFreq_333MHz:
                if ((meminfo->single_rank_mask == 1)
                   && (meminfo->x16_mask == 1)) /* SR x16 */
                        dwordx = 0x00272700;
                else if ((meminfo->x4_mask == 0) && (meminfo->x16_mask == 0)
                         && (meminfo->single_rank_mask == 0)) { /* DR x8 */
                        SlowAccessMode = 1;
                        dwordx = 0x00002800;
                } else {        /* SR x8, DR x16 */
                        dwordx = 0x002A2A00;
                }
                break;
        case DCH_MemClkFreq_400MHz:
                if ((meminfo->single_rank_mask == 1)
                   && (meminfo->x16_mask == 1)) /* SR x16 */
                        dwordx = 0x00292900;
                else if ((meminfo->x4_mask == 0) && (meminfo->x16_mask == 0)
                         && (meminfo->single_rank_mask == 0)) { /* DR x8 */
                        SlowAccessMode = 1;
                        dwordx = 0x00002A00;
                } else {        /* SR x8, DR x16 */
                        dwordx = 0x002A2A00;
                }
                break;
        }
#endif

#if DIMM_SUPPORT==0x0004  /* DDR2 and unbuffered */
        /* for UNBUF DIMM */
        dword = 0x00111222;
        dwordx = 0x002f2f00;
        switch (meminfo->memclk_set) {
        case DCH_MemClkFreq_200MHz:
                if (dimm_mask == 0x03) {
                        SlowAccessMode = 1;
                        dword = 0x00111322;
                }
                break;
        case DCH_MemClkFreq_266MHz:
                if (dimm_mask == 0x03) {
                        SlowAccessMode = 1;
                        dword = 0x00111322;
                        if ((meminfo->x4_mask == 0 ) && (meminfo->x16_mask == 0)) {
                                switch (meminfo->single_rank_mask) {
                                case 0x03:
                                        dwordx = 0x00002f00; //x8 single Rank
                                        break;
                                case 0x00:
                                        dwordx = 0x00342f00; //x8 double Rank
                                        break;
                                default:
                                        dwordx = 0x00372f00; //x8 single Rank and double Rank mixed
                                }
                        } else if ((meminfo->x4_mask == 0 ) && (meminfo->x16_mask == 0x01) && (meminfo->single_rank_mask == 0x01)) {
                                         dwordx = 0x00382f00; //x8 Double Rank and x16 single Rank mixed
                         } else if ((meminfo->x4_mask == 0 ) && (meminfo->x16_mask == 0x02) && (meminfo->single_rank_mask == 0x02)) {
                                         dwordx = 0x00382f00; //x16 single Rank and x8 double Rank mixed
                        }

                } else {
                        if ((meminfo->x4_mask == 0 ) && (meminfo->x16_mask == 0x00) && ((meminfo->single_rank_mask == 0x01)||(meminfo->single_rank_mask == 0x02)))  { //x8 single rank
                                dwordx = 0x002f2f00;
                        } else {
                                dwordx = 0x002b2f00;
                        }
                }
                break;
        case DCH_MemClkFreq_333MHz:
                dwordx = 0x00202220;
                if (dimm_mask == 0x03) {
                        SlowAccessMode = 1;
                        dword = 0x00111322;
                        if ((meminfo->x4_mask == 0 ) && (meminfo->x16_mask == 0)) {
                                switch (meminfo->single_rank_mask) {
                                case 0x03:
                                        dwordx = 0x00302220; //x8 single Rank
                                        break;
                                case 0x00:
                                        dwordx = 0x002b2220; //x8 double Rank
                                        break;
                                default:
                                        dwordx = 0x002a2220; //x8 single Rank and double Rank mixed
                                }
                        } else if ((meminfo->x4_mask == 0) && (meminfo->x16_mask == 0x01) && (meminfo->single_rank_mask == 0x01)) {
                                        dwordx = 0x002c2220; //x8 Double Rank and x16 single Rank mixed
                        } else if ((meminfo->x4_mask == 0) && (meminfo->x16_mask == 0x02) && (meminfo->single_rank_mask == 0x02)) {
                                        dwordx = 0x002c2220; //x16 single Rank and x8 double Rank mixed
                        }
                }
                break;
        case DCH_MemClkFreq_400MHz:
                dwordx = 0x00202520;
                SlowAccessMode = 1;
                if (dimm_mask == 0x03) {
                        dword = 0x00113322;
                } else {
                        dword = 0x00113222;
                }
                break;
        }

        printk_raminit("\tdimm_mask = %08x\n", meminfo->dimm_mask);
        printk_raminit("\tx4_mask = %08x\n", meminfo->x4_mask);
        printk_raminit("\tx16_mask = %08x\n", meminfo->x16_mask);
        printk_raminit("\tsingle_rank_mask = %08x\n", meminfo->single_rank_mask);
        printk_raminit("\tODC = %08x\n", dword);
        printk_raminit("\tAddr Timing= %08x\n", dwordx);
#endif

#if (DIMM_SUPPORT & 0x0100)==0x0000 /* 2T mode only used for unbuffered DIMM */
        if (SlowAccessMode) {
                set_SlowAccessMode(ctrl);
        }
#endif

        if (!(meminfo->dimm_mask & 0x0F) && (meminfo->dimm_mask & 0xF0)) { /* channelB only? */
                /* Program the Output Driver Compensation Control Registers (Function 2:Offset 0x9c, index 0, 0x20) */
                pci_write_config32_index_wait(ctrl->f2, 0x98, 0x20, dword);

                /* Program the Address Timing Control Registers (Function 2:Offset 0x9c, index 4, 0x24) */
                pci_write_config32_index_wait(ctrl->f2, 0x98, 0x24, dwordx);
        } else {
                /* Program the Output Driver Compensation Control Registers (Function 2:Offset 0x9c, index 0, 0x20) */
                pci_write_config32_index_wait(ctrl->f2, 0x98, 0, dword);
                if (meminfo->is_Width128) {
                        pci_write_config32_index_wait(ctrl->f2, 0x98, 0x20, dword);
                }

                /* Program the Address Timing Control Registers (Function 2:Offset 0x9c, index 4, 0x24) */
                pci_write_config32_index_wait(ctrl->f2, 0x98, 4, dwordx);
                if (meminfo->is_Width128) {
                        pci_write_config32_index_wait(ctrl->f2, 0x98, 0x24, dwordx);
                }
        }
}


static void set_RDqsEn(const struct mem_controller *ctrl,
                        const struct mem_param *param, struct mem_info *meminfo)
{
#if CPU_SOCKET_TYPE==0x10
        //only need to set for reg and x8
        uint32_t dch;

        dch = pci_read_config32(ctrl->f2, DRAM_CONFIG_HIGH);

        dch &= ~DCH_RDqsEn;
        if ((!meminfo->x4_mask) && (!meminfo->x16_mask)) {
                dch |= DCH_RDqsEn;
        }

        pci_write_config32(ctrl->f2, DRAM_CONFIG_HIGH, dch);
#endif
}

static void set_idle_cycle_limit(const struct mem_controller *ctrl,
                                  const struct mem_param *param)
{
        uint32_t dcm;
        /* AMD says to Hardcode this */
        dcm = pci_read_config32(ctrl->f2, DRAM_CTRL_MISC);
        dcm &= ~(DCM_ILD_lmt_MASK << DCM_ILD_lmt_SHIFT);
        dcm |= DCM_ILD_lmt_16 << DCM_ILD_lmt_SHIFT;
        dcm |= DCM_DCC_EN;
        pci_write_config32(ctrl->f2, DRAM_CTRL_MISC, dcm);
}

static void set_RdWrQByp(const struct mem_controller *ctrl,
                          const struct mem_param *param)
{
        set_TT(ctrl, param, DRAM_CTRL_MISC, DCM_RdWrQByp_SHIFT, DCM_RdWrQByp_MASK,0, 0, 3, 2, "RdWrQByp");
}

static long spd_set_dram_timing(const struct mem_controller *ctrl,
                                 const struct mem_param *param,
                                 struct mem_info *meminfo)
{
        int i;

        for (i = 0; i < DIMM_SOCKETS; i++) {
                int rc;
                if (!(meminfo->dimm_mask & (1 << i)) &&
                    !(meminfo->dimm_mask & (1 << (DIMM_SOCKETS + i))) ) {
                        continue;
                }
                printk_raminit("spd_set_dram_timing dimm socket:  %08x\n", i);
                /* DRAM Timing Low Register */
                printk_raminit("\ttrc\n");
                if ((rc = update_dimm_Trc (ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttrcd\n");
                if ((rc = update_dimm_Trcd(ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttrrd\n");
                if ((rc = update_dimm_Trrd(ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttras\n");
                if ((rc = update_dimm_Tras(ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttrp\n");
                if ((rc = update_dimm_Trp (ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttrtp\n");
                if ((rc = update_dimm_Trtp(ctrl, param, i, meminfo)) <= 0) goto dimm_err;

                printk_raminit("\ttwr\n");
                if ((rc = update_dimm_Twr (ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                /* DRAM Timing High Register */
                printk_raminit("\ttref\n");
                if ((rc = update_dimm_Tref(ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttwtr\n");
                if ((rc = update_dimm_Twtr(ctrl, param, i, meminfo->dimm_mask)) <= 0) goto dimm_err;

                printk_raminit("\ttrfc\n");
                if ((rc = update_dimm_Trfc(ctrl, param, i, meminfo)) <= 0) goto dimm_err;

                /* DRAM Config Low */

                continue;
        dimm_err:
                printk_debug("spd_set_dram_timing dimm_err!\n");
                if (rc < 0) {
                        return -1;
                }
                meminfo->dimm_mask = disable_dimm(ctrl, i, meminfo);
        }

        get_extra_dimm_mask(ctrl, meminfo); // will be used by RDqsEn and dimm_x4
        /* DRAM Timing Low Register */

        /* DRAM Timing High Register */
        set_TrwtTO(ctrl, param);
        set_Twrrd (ctrl, param);
        set_Twrwr (ctrl, param);
        set_Trdrd (ctrl, param);

        set_4RankRDimm(ctrl, param, meminfo);

        /* DRAM Config High */
        set_Tfaw(ctrl, param, meminfo);
        set_DcqBypassMax(ctrl, param);
        set_max_async_latency(ctrl, param);
        set_RDqsEn(ctrl, param, meminfo);

        /* DRAM Config Low */
        set_ecc(ctrl, param, meminfo);
        set_dimm_x4(ctrl, param, meminfo);
        set_DramTerm(ctrl, param, meminfo);

        /* DRAM Control Misc */
        set_idle_cycle_limit(ctrl, param);
        set_RdWrQByp(ctrl, param);

        return meminfo->dimm_mask;
}

static void sdram_set_spd_registers(const struct mem_controller *ctrl,
                                     struct sys_info *sysinfo)
{
        struct spd_set_memclk_result result;
        const struct mem_param *param;
        struct mem_param paramx;
        struct mem_info *meminfo;
#if 1
        if (!sysinfo->ctrl_present[ctrl->node_id]) {
                return;
        }
#endif
        meminfo = &sysinfo->meminfo[ctrl->node_id];

        printk_debug("sdram_set_spd_registers: paramx :%p\n", &paramx);

        activate_spd_rom(ctrl);
        meminfo->dimm_mask = spd_detect_dimms(ctrl);

        printk_raminit("sdram_set_spd_registers: dimm_mask=0x%x\n", meminfo->dimm_mask);

        if (!(meminfo->dimm_mask & ((1 << 2*DIMM_SOCKETS) - 1)))
        {
                printk_debug("No memory for this cpu\n");
                return;
        }
        meminfo->dimm_mask = spd_enable_2channels(ctrl, meminfo);
        printk_raminit("spd_enable_2channels: dimm_mask=0x%x\n", meminfo->dimm_mask);
        if (meminfo->dimm_mask == -1)
                goto hw_spd_err;

        meminfo->dimm_mask = spd_set_ram_size(ctrl, meminfo);
        printk_raminit("spd_set_ram_size: dimm_mask=0x%x\n", meminfo->dimm_mask);
        if (meminfo->dimm_mask == -1)
                goto hw_spd_err;

        meminfo->dimm_mask = spd_handle_unbuffered_dimms(ctrl, meminfo);
        printk_raminit("spd_handle_unbuffered_dimms: dimm_mask=0x%x\n", meminfo->dimm_mask);
        if (meminfo->dimm_mask == -1)
                goto hw_spd_err;

        result = spd_set_memclk(ctrl, meminfo);
        param     = result.param;
        meminfo->dimm_mask = result.dimm_mask;
        printk_raminit("spd_set_memclk: dimm_mask=0x%x\n", meminfo->dimm_mask);
        if (meminfo->dimm_mask == -1)
                goto hw_spd_err;

        //store memclk set to sysinfo, incase we need rebuilt param again
        meminfo->memclk_set = param->dch_memclk;

        memcpy(&paramx, param, sizeof(paramx));

        paramx.divisor = get_exact_divisor(param->dch_memclk, paramx.divisor);

        meminfo->dimm_mask = spd_set_dram_timing(ctrl, &paramx, meminfo);
        printk_raminit("spd_set_dram_timing: dimm_mask=0x%x\n", meminfo->dimm_mask);
        if (meminfo->dimm_mask == -1)
                goto hw_spd_err;

        order_dimms(ctrl, meminfo);

        return;
 hw_spd_err:
        /* Unrecoverable error reading SPD data */
        die("Unrecoverable error reading SPD data. No qualified DIMMs?");
        return;
}

#define TIMEOUT_LOOPS 300000

#include "raminit_f_dqs.c"

#if HW_MEM_HOLE_SIZEK != 0
static uint32_t hoist_memory(int controllers, const struct mem_controller *ctrl,unsigned hole_startk, int i)
{
        int ii;
        uint32_t carry_over;
        device_t dev;
        uint32_t base, limit;
        uint32_t basek;
        uint32_t hoist;
        int j;

        carry_over = (4*1024*1024) - hole_startk;

        for (ii=controllers - 1;ii>i;ii--) {
                base  = pci_read_config32(ctrl[0].f1, 0x40 + (ii << 3));
                if ((base & ((1<<1)|(1<<0))) != ((1<<1)|(1<<0))) {
                        continue;
                }
                limit = pci_read_config32(ctrl[0].f1, 0x44 + (ii << 3));
                limit += (carry_over << 2 );
                base  += (carry_over << 2 );
                for (j = 0; j < controllers; j++) {
                        pci_write_config32(ctrl[j].f1, 0x44 + (ii << 3), limit);
                        pci_write_config32(ctrl[j].f1, 0x40 + (ii << 3), base );
                }
        }
        limit = pci_read_config32(ctrl[0].f1, 0x44 + (i << 3));
        limit += (carry_over << 2);
        for (j = 0; j < controllers; j++) {
                pci_write_config32(ctrl[j].f1, 0x44 + (i << 3), limit);
        }
        dev = ctrl[i].f1;
        base  = pci_read_config32(dev, 0x40 + (i << 3));
        basek  = (base & 0xffff0000) >> 2;
        if (basek == hole_startk) {
                //don't need set memhole here, because hole off set will be 0, overflow
                //so need to change base reg instead, new basek will be 4*1024*1024
                base &= 0x0000ffff;
                base |= (4*1024*1024)<<2;
                for (j = 0; j < controllers; j++) {
                        pci_write_config32(ctrl[j].f1, 0x40 + (i<<3), base);
                }
        }  else  {
                hoist = /* hole start address */
                        ((hole_startk << 10) & 0xff000000) +
                        /* hole address to memory controller address */
                        (((basek + carry_over) >> 6) & 0x0000ff00) +
                        /* enable */
                        1;
                pci_write_config32(dev, 0xf0, hoist);
        }

        return carry_over;
}

static void set_hw_mem_hole(int controllers, const struct mem_controller *ctrl)
{

        uint32_t hole_startk;
        int i;

        hole_startk = 4*1024*1024 - HW_MEM_HOLE_SIZEK;

#if HW_MEM_HOLE_SIZE_AUTO_INC == 1
        /* We need to double check if the hole_startk is valid, if it is equal
           to basek, we need to decrease it some */
        uint32_t basek_pri;
        for (i=0; i<controllers; i++) {
                        uint32_t base;
                        unsigned base_k;
                        base  = pci_read_config32(ctrl[0].f1, 0x40 + (i << 3));
                        if ((base & ((1<<1)|(1<<0))) != ((1<<1)|(1<<0))) {
                                continue;
                        }
                        base_k = (base & 0xffff0000) >> 2;
                        if (base_k == hole_startk) {
                                /* decrease mem hole startk to make sure it is
                                   on middle of previous node */
                                hole_startk -= (base_k - basek_pri) >> 1;
                                break; //only one hole
                        }
                        basek_pri = base_k;
        }
#endif
        /* find node index that need do set hole */
        for (i=0; i < controllers; i++) {
                uint32_t base, limit;
                unsigned base_k, limit_k;
                base  = pci_read_config32(ctrl[0].f1, 0x40 + (i << 3));
                if ((base & ((1 << 1) | (1 << 0))) != ((1 << 1) | (1 << 0))) {
                        continue;
                }
                limit = pci_read_config32(ctrl[0].f1, 0x44 + (i << 3));
                base_k = (base & 0xffff0000) >> 2;
                limit_k = ((limit + 0x00010000) & 0xffff0000) >> 2;
                if ((base_k <= hole_startk) && (limit_k > hole_startk)) {
                        unsigned end_k;
                        hoist_memory(controllers, ctrl, hole_startk, i);
                        end_k = memory_end_k(ctrl, controllers);
                        set_top_mem(end_k, hole_startk);
                        break; //only one hole
                }
        }

}
#endif

#include "exit_from_self.c"

static void sdram_enable(int controllers, const struct mem_controller *ctrl,
                          struct sys_info *sysinfo)
{
        int i;
#ifdef ACPI_IS_WAKEUP_EARLY
        int suspend = acpi_is_wakeup_early();
#else
        int suspend = 0;
#endif
 
#if K8_REV_F_SUPPORT_F0_F1_WORKAROUND == 1
         unsigned cpu_f0_f1[8];
        /* FIXME: How about 32 node machine later? */
        tsc_t tsc, tsc0[8];

        printk_debug("sdram_enable: tsc0[8]: %p", &tsc0[0]);
#endif
        uint32_t dword;

        /* Error if I don't have memory */
        if (memory_end_k(ctrl, controllers) == 0) {
                die("No memory\n");
        }

        /* Before enabling memory start the memory clocks */
        for (i = 0; i < controllers; i++) {
                uint32_t dtl, dch;
                if (!sysinfo->ctrl_present[ i ])
                        continue;
                dch = pci_read_config32(ctrl[i].f2, DRAM_CONFIG_HIGH);

                /* if no memory installed, disabled the interface */
                if (sysinfo->meminfo[i].dimm_mask==0x00){
                        dch |= DCH_DisDramInterface;
                        pci_write_config32(ctrl[i].f2, DRAM_CONFIG_HIGH, dch);

                } else {
                        dch |= DCH_MemClkFreqVal;
                        pci_write_config32(ctrl[i].f2, DRAM_CONFIG_HIGH, dch);
                        /* address timing and Output driver comp Control */
                        set_misc_timing(ctrl+i, sysinfo->meminfo+i );
                }
        }

        /* We need to wait a minimum of 20 MEMCLKS to enable the InitDram */
        memreset(controllers, ctrl);

        /* lets override the rest of the routine */
        if (suspend) {
                printk_debug("Wakeup!\n");
                exit_from_self(controllers, ctrl, sysinfo);
                printk_debug("Mem running !\n");
                return;
        }

        for (i = 0; i < controllers; i++) {
                uint32_t dcl, dch;
                if (!sysinfo->ctrl_present[ i ])
                        continue;
                /* Skip everything if I don't have any memory on this controller */
                dch = pci_read_config32(ctrl[i].f2, DRAM_CONFIG_HIGH);
                if (!(dch & DCH_MemClkFreqVal)) {
                        continue;
                }

                /* ChipKill */
                dcl = pci_read_config32(ctrl[i].f2, DRAM_CONFIG_LOW);
                if (dcl & DCL_DimmEccEn) {
                        uint32_t mnc;
                        printk_spew("ECC enabled\n");
                        mnc = pci_read_config32(ctrl[i].f3, MCA_NB_CONFIG);
                        mnc |= MNC_ECC_EN;
                        if (dcl & DCL_Width128) {
                                mnc |= MNC_CHIPKILL_EN;
                        }
                        pci_write_config32(ctrl[i].f3, MCA_NB_CONFIG, mnc);
                }

#if K8_REV_F_SUPPORT_F0_F1_WORKAROUND == 1
                cpu_f0_f1[i] = is_cpu_pre_f2_in_bsp(i);
                if (cpu_f0_f1[i]) {
                        //Rev F0/F1 workaround
#if 1
                                /* Set the DqsRcvEnTrain bit */
                        dword = pci_read_config32(ctrl[i].f2, DRAM_CTRL);
                        dword |= DC_DqsRcvEnTrain;
                        pci_write_config32(ctrl[i].f2, DRAM_CTRL, dword);
#endif
                        tsc0[i] = rdtsc();
                }
#endif

#if 0
                /* Set the DqsRcvEnTrain bit */
                dword = pci_read_config32(ctrl[i].f2, DRAM_CTRL);
                dword |= DC_DqsRcvEnTrain;
                pci_write_config32(ctrl[i].f2, DRAM_CTRL, dword);
#endif

                pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
                dcl |= DCL_InitDram;
                pci_write_config32(ctrl[i].f2, DRAM_CONFIG_LOW, dcl);
        }

        for (i = 0; i < controllers; i++) {
                uint32_t dcl, dch, dcm;
                if (!sysinfo->ctrl_present[ i ])
                        continue;
                /* Skip everything if I don't have any memory on this controller */
                if (sysinfo->meminfo[i].dimm_mask==0x00) continue;

                printk_debug("Initializing memory: ");
                int loops = 0;
                do {
                        dcl = pci_read_config32(ctrl[i].f2, DRAM_CONFIG_LOW);
                        loops++;
                        if ((loops & 1023) == 0) {
                                printk_debug(".");
                        }
                } while(((dcl & DCL_InitDram) != 0) && (loops < TIMEOUT_LOOPS));
                if (loops >= TIMEOUT_LOOPS) {
                        printk_debug(" failed\n");
                        continue;
                }

                /* Wait until it is safe to touch memory */
                do {
                        dcm = pci_read_config32(ctrl[i].f2, DRAM_CTRL_MISC);
                } while(((dcm & DCM_MemClrStatus) == 0) /* || ((dcm & DCM_DramEnabled) == 0)*/ );

#if K8_REV_F_SUPPORT_F0_F1_WORKAROUND == 1
                if (cpu_f0_f1[i]) {
                        tsc= rdtsc();

                        print_debug_dqs_tsc("\nbegin tsc0", i, tsc0[i].hi, tsc0[i].lo, 2);
                        print_debug_dqs_tsc("end   tsc ", i, tsc.hi, tsc.lo, 2);

                        if (tsc.lo<tsc0[i].lo) {
                                tsc.hi--;
                        }
                        tsc.lo -= tsc0[i].lo;
                        tsc.hi -= tsc0[i].hi;

                        tsc0[i].lo = tsc.lo;
                        tsc0[i].hi = tsc.hi;

                        print_debug_dqs_tsc("     dtsc0", i, tsc0[i].hi, tsc0[i].lo, 2);
                }
#endif
                printk_debug(" done\n");
        }

#if HW_MEM_HOLE_SIZEK != 0
        /* init hw mem hole here */
        /* DramHoleValid bit only can be set after MemClrStatus is set by Hardware */
        set_hw_mem_hole(controllers, ctrl);
#endif

        /* store tom to sysinfo, and it will be used by dqs_timing */
        {
                msr_t msr;
                //[1M, TOM)
                msr = rdmsr(TOP_MEM);
                sysinfo->tom_k = ((msr.hi<<24) | (msr.lo>>8))>>2;

                //[4G, TOM2)
                msr = rdmsr(TOP_MEM2);
                sysinfo->tom2_k = ((msr.hi<<24)| (msr.lo>>8))>>2;
        }

        for (i = 0; i < controllers; i++) {
                sysinfo->mem_trained[i] = 0;

                if (!sysinfo->ctrl_present[ i ])
                        continue;

                /* Skip everything if I don't have any memory on this controller */
                if (sysinfo->meminfo[i].dimm_mask==0x00)
                        continue;

                sysinfo->mem_trained[i] = 0x80; // mem need to be trained
        }


#if MEM_TRAIN_SEQ ==  0
   #if K8_REV_F_SUPPORT_F0_F1_WORKAROUND == 1
        dqs_timing(controllers, ctrl, tsc0, sysinfo);
   #else
        dqs_timing(controllers, ctrl, sysinfo);
   #endif
#else

#if MEM_TRAIN_SEQ == 2
        /* need to enable mtrr, so dqs training could access the test address  */
        setup_mtrr_dqs(sysinfo->tom_k, sysinfo->tom2_k);
#endif

        for (i = 0; i < controllers; i++) {
                /* Skip everything if I don't have any memory on this controller */
                if (sysinfo->mem_trained[i]!=0x80)
                        continue;

                dqs_timing(i, &ctrl[i], sysinfo, 1);

#if MEM_TRAIN_SEQ == 1
                break; // only train the first node with ram
#endif
        }

#if MEM_TRAIN_SEQ == 2
        clear_mtrr_dqs(sysinfo->tom2_k);
#endif

#endif

#if MEM_TRAIN_SEQ != 1
        wait_all_core0_mem_trained(sysinfo);
#endif

}

static void fill_mem_ctrl(int controllers, struct mem_controller *ctrl_a,
                          const uint16_t *spd_addr)
{
        int i;
        int j;
        struct mem_controller *ctrl;
        for (i=0;i<controllers; i++) {
                ctrl = &ctrl_a[i];
                ctrl->node_id = i;
                ctrl->f0 = PCI_DEV(0, 0x18+i, 0);
                ctrl->f1 = PCI_DEV(0, 0x18+i, 1);
                ctrl->f2 = PCI_DEV(0, 0x18+i, 2);
                ctrl->f3 = PCI_DEV(0, 0x18+i, 3);

                if (spd_addr == (void *)0) continue;

                for (j=0;j<DIMM_SOCKETS;j++) {
                        ctrl->channel0[j] = spd_addr[(i*2+0)*DIMM_SOCKETS + j];
                        ctrl->channel1[j] = spd_addr[(i*2+1)*DIMM_SOCKETS + j];
                }
        }
}