1a8387eaba
It is desireable to not have printk() inside a function body that can be used for udelay(). This avoids potential infinite recursion. Change-Id: Ie67fc2a8da8351f22794e4d36c55b887c298e8ca Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/31338 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <cpu/cpu.h>
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#include <cpu/x86/msr.h>
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#include <cpu/intel/speedstep.h>
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#include <cpu/intel/fsb.h>
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#include <console/console.h>
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#include <commonlib/helpers.h>
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static int get_fsb(void)
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{
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struct cpuinfo_x86 c;
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static const short core_fsb[8] = { -1, 133, -1, 166, -1, 100, -1, -1 };
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static const short core2_fsb[8] = { 266, 133, 200, 166, 333, 100, 400, -1 };
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static const short f2x_fsb[8] = { 100, 133, 200, 166, 333, -1, -1, -1 };
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msr_t msr;
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int ret = -2;
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get_fms(&c, cpuid_eax(1));
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switch (c.x86) {
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case 0x6:
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switch (c.x86_model) {
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case 0xe: /* Core Solo/Duo */
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case 0x1c: /* Atom */
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ret = core_fsb[rdmsr(MSR_FSB_FREQ).lo & 7];
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break;
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case 0xf: /* Core 2 or Xeon */
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case 0x17: /* Enhanced Core */
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ret = core2_fsb[rdmsr(MSR_FSB_FREQ).lo & 7];
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break;
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case 0x2a: /* SandyBridge BCLK fixed at 100MHz*/
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case 0x3a: /* IvyBridge BCLK fixed at 100MHz*/
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case 0x3c: /* Haswell BCLK fixed at 100MHz */
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case 0x45: /* Haswell-ULT BCLK fixed at 100MHz */
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ret = 100;
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break;
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}
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break;
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case 0xf: /* Netburst */
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msr = rdmsr(MSR_EBC_FREQUENCY_ID);
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switch (c.x86_model) {
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case 0x2:
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ret = f2x_fsb[(msr.lo >> 16) & 7];
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break;
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case 0x3:
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case 0x4:
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case 0x6:
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ret = core2_fsb[(msr.lo >> 16) & 7];
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break;
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}
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}
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return ret;
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}
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int get_ia32_fsb(void)
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{
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int ret;
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ret = get_fsb();
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if (ret == -1)
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printk(BIOS_ERR, "FSB not found\n");
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if (ret == -2)
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printk(BIOS_ERR, "CPU not supported\n");
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return ret;
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}
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/**
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* @brief Returns three times the FSB clock in MHz
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*
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* The result of calculations with the returned value shall be divided by 3.
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* This helps to avoid rounding errors.
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*/
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int get_ia32_fsb_x3(void)
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{
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const int fsb = get_ia32_fsb();
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if (fsb > 0)
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return 100 * DIV_ROUND_CLOSEST(3 * fsb, 100);
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printk(BIOS_ERR, "FSB not supported or not found\n");
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return -1;
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}
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