src/northbridge/amd/amdmct/mct/mctmtr_d.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16
  17 #include "mct_d.h"
  18 #include <cpu/amd/mtrr.h>
  19
  20 static void SetMTRRrangeWB_D(u32 Base, u32 *pLimit, u32 *pMtrrAddr);
  21 static void SetMTRRrange_D(u32 Base, u32 *pLimit, u32 *pMtrrAddr, u16 MtrrType);
  22
  23 void CPUMemTyping_D(struct MCTStatStruc *pMCTstat,
  24                          struct DCTStatStruc *pDCTstatA)
  25 {
  26         /* BSP only.  Set the fixed MTRRs for common legacy ranges.
  27          * Set TOP_MEM and TOM2.
  28          * Set some variable MTRRs with WB Uncacheable type.
  29          */
  30
  31         u32 Bottom32bIO, Bottom40bIO, Cache32bTOP;
  32         u32 val;
  33         u32 addr;
  34         u32 lo, hi;
  35
  36         /* Set temporary top of memory from Node structure data.
  37          * Adjust temp top of memory down to accommodate 32-bit IO space.
  38          * Bottom40bIO=top of memory, right justified 8 bits
  39          *      (defines dram versus IO space type)
  40          * Bottom32bIO=sub 4GB top of memory, right justified 8 bits
  41          *      (defines dram versus IO space type)
  42          * Cache32bTOP=sub 4GB top of WB cacheable memory,
  43          *      right justified 8 bits
  44          */
  45
  46         val = mctGet_NVbits(NV_BottomIO);
  47         if(val == 0)
  48                 val++;
  49
  50         Bottom32bIO = val << (24-8);
  51
  52         val = pMCTstat->SysLimit + 1;
  53         if(val <= _4GB_RJ8) {
  54                 Bottom40bIO = 0;
  55                 if(Bottom32bIO >= val)
  56                         Bottom32bIO = val;
  57         } else {
  58                 Bottom40bIO = val;
  59         }
  60
  61         Cache32bTOP = Bottom32bIO;
  62
  63         /*======================================================================
  64          Set default values for CPU registers
  65         ======================================================================*/
  66
  67         /* NOTE : For coreboot, we don't need to set mtrr enables here because
  68         they are still enable from cache_as_ram.inc */
  69
  70         addr = 0x250;
  71         lo = 0x1E1E1E1E;
  72         hi = lo;
  73         _WRMSR(addr, lo, hi);           /* 0 - 512K = WB Mem */
  74         addr = 0x258;
  75         _WRMSR(addr, lo, hi);           /* 512K - 640K = WB Mem */
  76
  77         /*======================================================================
  78           Set variable MTRR values
  79          ======================================================================*/
  80         /* NOTE: for coreboot change from 0x200 to 0x204: coreboot is using
  81                 0x200, 0x201 for [1M, CONFIG_TOP_MEM)
  82                 0x202, 0x203 for ROM Caching
  83                  */
  84         addr = 0x204;   /* MTRR phys base 2*/
  85                         /* use TOP_MEM as limit*/
  86                         /* Limit=TOP_MEM|TOM2*/
  87                         /* Base=0*/
  88         print_tx("\t CPUMemTyping: Cache32bTOP:", Cache32bTOP);
  89         SetMTRRrangeWB_D(0, &Cache32bTOP, &addr);
  90                                 /* Base */
  91                                 /* Limit */
  92                                 /* MtrrAddr */
  93         if(addr == -1)          /* ran out of MTRRs?*/
  94                 pMCTstat->GStatus |= 1<<GSB_MTRRshort;
  95
  96         pMCTstat->Sub4GCacheTop = Cache32bTOP<<8;
  97
  98         /*======================================================================
  99          Set TOP_MEM and TOM2 CPU registers
 100         ======================================================================*/
 101         addr = TOP_MEM;
 102         lo = Bottom32bIO<<8;
 103         hi = Bottom32bIO>>24;
 104         _WRMSR(addr, lo, hi);
 105         print_tx("\t CPUMemTyping: Bottom32bIO:", Bottom32bIO);
 106         print_tx("\t CPUMemTyping: Bottom40bIO:", Bottom40bIO);
 107         if(Bottom40bIO) {
 108                 hi = Bottom40bIO >> 24;
 109                 lo = Bottom40bIO << 8;
 110                 if (mctSetNodeBoundary_D())
 111                         lo &= 0xC0000000;
 112                 addr += 3;              /* TOM2 */
 113                 _WRMSR(addr, lo, hi);
 114         }
 115         addr = 0xC0010010;              /* SYS_CFG */
 116         _RDMSR(addr, &lo, &hi);
 117         if(Bottom40bIO) {
 118                 lo |= (1<<21);          /* MtrrTom2En=1 */
 119                 lo |= (1<<22);          /* Tom2ForceMemTypeWB */
 120         } else {
 121                 lo &= ~(1<<21);         /* MtrrTom2En=0 */
 122                 lo &= ~(1<<22);         /* Tom2ForceMemTypeWB */
 123         }
 124         _WRMSR(addr, lo, hi);
 125 }
 126
 127
 128 static void SetMTRRrangeWB_D(u32 Base, u32 *pLimit, u32 *pMtrrAddr)
 129 {
 130         /*set WB type*/
 131         SetMTRRrange_D(Base, pLimit, pMtrrAddr, 6);
 132 }
 133
 134
 135 static void SetMTRRrange_D(u32 Base, u32 *pLimit, u32 *pMtrrAddr, u16 MtrrType)
 136 {
 137         /* Program MTRRs to describe given range as given cache type.
 138          * Use MTRR pairs starting with the given MTRRphys Base address,
 139          * and use as many as is required up to (excluding) MSR 020C, which
 140          * is reserved for OS.
 141          *
 142          * "Limit" in the context of this procedure is not the numerically
 143          * correct limit, but rather the Last address+1, for purposes of coding
 144          * efficiency and readability.  Size of a region is then Limit-Base.
 145          *
 146          * 1. Size of each range must be a power of two
 147          * 2. Each range must be naturally aligned (Base is same as size)
 148          *
 149          * There are two code paths: the ascending path and descending path
 150          * (analogous to bsf and bsr), where the next limit is a function of the
 151          * next set bit in a forward or backward sequence of bits (as a function
 152          * of the Limit). We start with the ascending path, to ensure that
 153          * regions are naturally aligned, then we switch to the descending path
 154          * to maximize MTRR usage efficiency. Base=0 is a special case where we
 155          * start with the descending path. Correct Mask for region is
 156          * 2comp(Size-1)-1, which is 2comp(Limit-Base-1)-1
 157          */
 158
 159         u32 curBase, curLimit, curSize;
 160         u32 val, valx;
 161         u32 addr;
 162
 163         val = curBase = Base;
 164         curLimit = *pLimit;
 165         addr = *pMtrrAddr;
 166         while((addr >= 0x200) && (addr < 0x20C) && (val < *pLimit)) {
 167                 /* start with "ascending" code path */
 168                 /* alignment (largest block size)*/
 169                 valx = 1 << bsf(curBase);
 170                 curSize = valx;
 171
 172                 /* largest legal limit, given current non-zero range Base*/
 173                 valx += curBase;
 174                 if((curBase == 0) || (*pLimit < valx)) {
 175                         /* flop direction to "descending" code path*/
 176                         valx = 1<<bsr(*pLimit - curBase);
 177                         curSize = valx;
 178                         valx += curBase;
 179                 }
 180                 curLimit = valx;                /*eax=curBase, edx=curLimit*/
 181                 valx = val>>24;
 182                 val <<= 8;
 183
 184                 /* now program the MTRR */
 185                 val |= MtrrType;                /* set cache type (UC or WB)*/
 186                 _WRMSR(addr, val, valx);        /* prog. MTRR with current region Base*/
 187                 val = ((~(curSize - 1))+1) - 1; /* Size-1*/ /*Mask=2comp(Size-1)-1*/
 188                 valx = (val >> 24) | (0xff00);  /* GH have 48 bits addr */
 189                 val <<= 8;
 190                 val |= ( 1 << 11);                      /* set MTRR valid*/
 191                 addr++;
 192                 _WRMSR(addr, val, valx);        /* prog. MTRR with current region Mask*/
 193                 val = curLimit;
 194                 curBase = val;                  /* next Base = current Limit (loop exit)*/
 195                 addr++;                         /* next MTRR pair addr */
 196         }
 197         if(val < *pLimit) {
 198                 *pLimit = val;
 199                 addr = -1;
 200         }
 201         *pMtrrAddr = addr;
 202 }
 203
 204 void UMAMemTyping_D(struct MCTStatStruc *pMCTstat, struct DCTStatStruc *pDCTstatA)
 205 {
 206 /* UMA memory size may need splitting the MTRR configuration into two
 207   Before training use NB_BottomIO or the physical memory size to set the MTRRs.
 208   After training, add UMAMemTyping function to reconfigure the MTRRs based on
 209   NV_BottomUMA (for UMA systems only).
 210   This two-step process allows all memory to be cached for training
 211 */
 212         u32 Bottom32bIO, Cache32bTOP;
 213         u32 val;
 214         u32 addr;
 215         u32 lo, hi;
 216
 217         /*======================================================================
 218          * Adjust temp top of memory down to accommodate UMA memory start
 219          *======================================================================*/
 220         /* Bottom32bIO=sub 4GB top of memory, right justified 8 bits
 221          * (defines dram versus IO space type)
 222          * Cache32bTOP=sub 4GB top of WB cacheable memory, right justified 8 bits */
 223
 224         Bottom32bIO = pMCTstat->Sub4GCacheTop >> 8;
 225
 226         val = mctGet_NVbits(NV_BottomUMA);
 227         if (val == 0)
 228                 val++;
 229
 230         val <<= (24-8);
 231         if (val < Bottom32bIO) {
 232                 Cache32bTOP = val;
 233                 pMCTstat->Sub4GCacheTop = val;
 234
 235         /*======================================================================
 236          * Clear variable MTRR values
 237          *======================================================================*/
 238                 addr = 0x200;
 239                 lo = 0;
 240                 hi = lo;
 241                 while( addr < 0x20C) {
 242                         _WRMSR(addr, lo, hi);           /* prog. MTRR with current region Mask */
 243                         addr++;                                         /* next MTRR pair addr */
 244                 }
 245
 246                 /*======================================================================
 247                  * Set variable MTRR values
 248                  *======================================================================*/
 249                 print_tx("\t UMAMemTyping_D: Cache32bTOP:", Cache32bTOP);
 250                 SetMTRRrangeWB_D(0, &Cache32bTOP, &addr);
 251                 if(addr == -1)          /* ran out of MTRRs?*/
 252                         pMCTstat->GStatus |= 1<<GSB_MTRRshort;
 253         }
 254 }