diff options
| -rw-r--r-- | src/cpu/intel/common/Makefile.inc | 4 | ||||
| -rw-r--r-- | src/cpu/intel/common/fsb.c | 85 | ||||
| -rw-r--r-- | src/cpu/x86/lapic/apic_timer.c | 53 | ||||
| -rw-r--r-- | src/include/cpu/intel/fsb.h | 30 |
4 files changed, 126 insertions, 46 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; +} diff --git a/src/cpu/x86/lapic/apic_timer.c b/src/cpu/x86/lapic/apic_timer.c index e6a12ce387..b3ddeac17e 100644 --- a/src/cpu/x86/lapic/apic_timer.c +++ b/src/cpu/x86/lapic/apic_timer.c @@ -21,6 +21,7 @@ #include <arch/io.h> #include <arch/cpu.h> #include <arch/early_variables.h> +#include <cpu/intel/fsb.h> #include <cpu/x86/msr.h> #include <cpu/x86/lapic.h> #include <cpu/intel/speedstep.h> @@ -44,53 +45,13 @@ static u32 g_timer_fsb CAR_GLOBAL; static int set_timer_fsb(void) { - struct cpuinfo_x86 c; - int core_fsb[8] = { -1, 133, -1, 166, -1, 100, -1, -1 }; - int core2_fsb[8] = { 266, 133, 200, 166, 333, 100, -1, -1 }; - int f2x_fsb[8] = { 100, 133, 200, 166, -1, -1, -1, -1 }; - msr_t msr; - - get_fms(&c, cpuid_eax(1)); - switch (c.x86) { - case 0x6: - switch (c.x86_model) { - case 0xe: /* Core Solo/Duo */ - case 0x1c: /* Atom */ - car_set_var(g_timer_fsb, - core_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]); - return 0; - case 0xf: /* Core 2 or Xeon */ - case 0x17: /* Enhanced Core */ - car_set_var(g_timer_fsb, - core2_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]); - return 0; - 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 */ - car_set_var(g_timer_fsb, 100); - return 0; - default: - car_set_var(g_timer_fsb, 200); - return 0; - } - case 0xf: /* Netburst */ - msr = rdmsr(MSR_EBC_FREQUENCY_ID); - switch (c.x86_model) { - case 0x2: - car_set_var(g_timer_fsb, - f2x_fsb[(msr.lo >> 16) & 7]); - return 0; - case 0x3: - case 0x4: - case 0x6: - car_set_var(g_timer_fsb, - core2_fsb[(msr.lo >> 16) & 7]); - return 0; - } /* default: fallthrough */ - default: - return -1; + int ia32_fsb = get_ia32_fsb(); + + if (ia32_fsb > 0) { + car_set_var(g_timer_fsb, ia32_fsb); + return 0; } + return -1; } static inline u32 get_timer_fsb(void) diff --git a/src/include/cpu/intel/fsb.h b/src/include/cpu/intel/fsb.h new file mode 100644 index 0000000000..49f3b17aae --- /dev/null +++ b/src/include/cpu/intel/fsb.h @@ -0,0 +1,30 @@ +/* + * 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. + */ + +#ifndef CPU_INTEL_FSB_H +#define CPU_INTEL_FSB_H + +/* + * This function returns: + * the system bus speed value in MHz + * -1 if FSB is not found + * -2 if the CPU is not supported + */ +int get_ia32_fsb(void); + +/* + * This function returns round up 3 * get_ia32_fsb() + */ +int get_ia32_fsb_x3(void); + +#endif /* CPU_INTEL_FSB_H */ |