diff options
Diffstat (limited to 'src/northbridge/intel/fsp_sandybridge/udelay.c')
| -rw-r--r-- | src/northbridge/intel/fsp_sandybridge/udelay.c | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/src/northbridge/intel/fsp_sandybridge/udelay.c b/src/northbridge/intel/fsp_sandybridge/udelay.c deleted file mode 100644 index e6dcbf180e..0000000000 --- a/src/northbridge/intel/fsp_sandybridge/udelay.c +++ /dev/null @@ -1,55 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2007-2008 coresystems GmbH - * - * 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. - */ - -#include <delay.h> -#include <stdint.h> -#include <cpu/x86/tsc.h> -#include <cpu/x86/msr.h> - -/** - * Intel SandyBridge/IvyBridge CPUs always run the TSC at BCLK=100MHz - */ - -void udelay(u32 us) -{ - u32 dword; - tsc_t tsc, tsc1, tscd; - msr_t msr; - u32 fsb = 100, divisor; - u32 d; /* ticks per us */ - - msr = rdmsr(0xce); - divisor = (msr.lo >> 8) & 0xff; - - d = fsb * divisor; /* On Core/Core2 this is divided by 4 */ - multiply_to_tsc(&tscd, us, d); - - tsc1 = rdtsc(); - dword = tsc1.lo + tscd.lo; - if ((dword < tsc1.lo) || (dword < tscd.lo)) { - tsc1.hi++; - } - tsc1.lo = dword; - tsc1.hi += tscd.hi; - - do { - tsc = rdtsc(); - } while ((tsc.hi < tsc1.hi) - || ((tsc.hi == tsc1.hi) && (tsc.lo <= tsc1.lo))); -} |