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authorElyes HAOUAS <ehaouas@noos.fr>2018-12-07 14:49:20 +0100
committerNico Huber <nico.h@gmx.de>2019-01-27 12:13:09 +0000
commitd731a24ff1b9f148609fa5052449caaab129e260 (patch)
tree3d830326ba066e14a6cc2df9d0f7330fa35af842 /src/cpu/intel
parentb58e99dfa56e1cf02e5bc0720872836bf8bded93 (diff)
downloadcoreboot-d731a24ff1b9f148609fa5052449caaab129e260.tar.xz
src/cpu/intel: Set get_ia32_fsb function common
Add get_ia32_fsb returns FSB values in MHz of intel's CPUs. Also add get_ia32_fsb_x3 function. It returns round up 3 * get_ia32_fsb. Change-Id: I232bf88de7ebba6ac5865db046ce79e9b2f3ed28 Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/30103 Reviewed-by: Nico Huber <nico.h@gmx.de> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu/intel')
-rw-r--r--src/cpu/intel/common/Makefile.inc4
-rw-r--r--src/cpu/intel/common/fsb.c85
2 files changed, 89 insertions, 0 deletions
diff --git a/src/cpu/intel/common/Makefile.inc b/src/cpu/intel/common/Makefile.inc
index 1e94ec92e4..b67ca85f0e 100644
--- a/src/cpu/intel/common/Makefile.inc
+++ b/src/cpu/intel/common/Makefile.inc
@@ -1 +1,5 @@
ramstage-y += common_init.c
+romstage-$(CONFIG_UDELAY_LAPIC) += fsb.c
+ramstage-$(CONFIG_UDELAY_LAPIC) += fsb.c
+postcar-$(CONFIG_UDELAY_LAPIC) += fsb.c
+smm-$(CONFIG_HAVE_SMI_HANDLER) += fsb.c
diff --git a/src/cpu/intel/common/fsb.c b/src/cpu/intel/common/fsb.c
new file mode 100644
index 0000000000..1f7c391a8f
--- /dev/null
+++ b/src/cpu/intel/common/fsb.c
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ */
+
+#include <cpu/cpu.h>
+#include <cpu/x86/msr.h>
+#include <cpu/intel/speedstep.h>
+#include <cpu/intel/fsb.h>
+#include <console/console.h>
+#include <commonlib/helpers.h>
+
+int get_ia32_fsb(void)
+{
+ struct cpuinfo_x86 c;
+ static const short core_fsb[8] = { -1, 133, -1, 166, -1, 100, -1, -1 };
+ static const short core2_fsb[8] = { 266, 133, 200, 166, 333, 100, 400, -1 };
+ static const short f2x_fsb[8] = { 100, 133, 200, 166, 333, -1, -1, -1 };
+ msr_t msr;
+ int ret = -2;
+
+ get_fms(&c, cpuid_eax(1));
+ switch (c.x86) {
+ case 0x6:
+ switch (c.x86_model) {
+ case 0xe: /* Core Solo/Duo */
+ case 0x1c: /* Atom */
+ ret = core_fsb[rdmsr(MSR_FSB_FREQ).lo & 7];
+ break;
+ case 0xf: /* Core 2 or Xeon */
+ case 0x17: /* Enhanced Core */
+ ret = core2_fsb[rdmsr(MSR_FSB_FREQ).lo & 7];
+ break;
+ case 0x2a: /* SandyBridge BCLK fixed at 100MHz*/
+ case 0x3a: /* IvyBridge BCLK fixed at 100MHz*/
+ case 0x3c: /* Haswell BCLK fixed at 100MHz */
+ case 0x45: /* Haswell-ULT BCLK fixed at 100MHz */
+ ret = 100;
+ break;
+ }
+ break;
+ case 0xf: /* Netburst */
+ msr = rdmsr(MSR_EBC_FREQUENCY_ID);
+ switch (c.x86_model) {
+ case 0x2:
+ ret = f2x_fsb[(msr.lo >> 16) & 7];
+ break;
+ case 0x3:
+ case 0x4:
+ case 0x6:
+ ret = core2_fsb[(msr.lo >> 16) & 7];
+ break;
+ }
+ }
+ if (ret == -1)
+ printk(BIOS_ERR, "FSB not found\n");
+ if (ret == -2)
+ printk(BIOS_ERR, "CPU not supported\n");
+ return ret;
+}
+
+/**
+ * @brief Returns three times the FSB clock in MHz
+ *
+ * The result of calculations with the returned value shall be divided by 3.
+ * This helps to avoid rounding errors.
+ */
+int get_ia32_fsb_x3(void)
+{
+ const int fsb = get_ia32_fsb();
+
+ if (fsb > 0)
+ return 100 * DIV_ROUND_CLOSEST(3 * fsb, 100);
+
+ printk(BIOS_ERR, "FSB not supported or not found\n");
+ return -1;
+}