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x86, mrst: add cpu type detection

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Medfield is the follow-up of Moorestown, it is treated under the same
HW sub-architecture. However, we do need to know the CPU type in order
for some of the driver to act accordingly.
We also have different optimal clock configuration for each CPU type.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1274295685-6774-3-git-send-email-jacob.jun.pan@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Jacob Pan 2010-05-19 12:01:24 -07:00 committed by H. Peter Anvin
parent 1dedefd1a0
commit a0c173bd8a
2 changed files with 45 additions and 0 deletions
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19
arch/x86/include/asm/mrst.h
View file

@ -11,8 +11,27 @@
#ifndef _ASM_X86_MRST_H
#define _ASM_X86_MRST_H
extern int pci_mrst_init(void);
extern int mrst_identify_cpu(void);
int __init sfi_parse_mrtc(struct sfi_table_header *table);
/*
* Medfield is the follow-up of Moorestown, it combines two chip solution into
* one. Other than that it also added always-on and constant tsc and lapic
* timers. Medfield is the platform name, and the chip name is called Penwell
* we treat Medfield/Penwell as a variant of Moorestown. Penwell can be
* identified via MSRs.
*/
enum mrst_cpu_type {
MRST_CPU_CHIP_LINCROFT = 1,
MRST_CPU_CHIP_PENWELL,
};
enum mrst_timer_options {
MRST_TIMER_DEFAULT,
MRST_TIMER_APBT_ONLY,
MRST_TIMER_LAPIC_APBT,
};
#define SFI_MTMR_MAX_NUM 8
#define SFI_MRTC_MAX 8

26
arch/x86/kernel/mrst.c
View file

@ -27,6 +27,8 @@
static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM];
static struct sfi_timer_table_entry sfi_mtimer_array[SFI_MTMR_MAX_NUM];
static int mrst_cpu_chip;
int sfi_mtimer_num;
struct sfi_rtc_table_entry sfi_mrtc_array[SFI_MRTC_MAX];
@ -216,6 +218,28 @@ static void __init mrst_setup_boot_clock(void)
setup_boot_APIC_clock();
};
int mrst_identify_cpu(void)
{
return mrst_cpu_chip;
}
EXPORT_SYMBOL_GPL(mrst_identify_cpu);
void __cpuinit mrst_arch_setup(void)
{
if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x27)
mrst_cpu_chip = MRST_CPU_CHIP_PENWELL;
else if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x26)
mrst_cpu_chip = MRST_CPU_CHIP_LINCROFT;
else {
pr_err("Unknown Moorestown CPU (%d:%d), default to Lincroft\n",
boot_cpu_data.x86, boot_cpu_data.x86_model);
mrst_cpu_chip = MRST_CPU_CHIP_LINCROFT;
}
pr_debug("Moorestown CPU %s identified\n",
(mrst_cpu_chip == MRST_CPU_CHIP_LINCROFT) ?
"Lincroft" : "Penwell");
}
/*
* Moorestown specific x86_init function overrides and early setup
* calls.
@ -230,6 +254,8 @@ void __init x86_mrst_early_setup(void)
x86_init.irqs.pre_vector_init = x86_init_noop;
x86_init.oem.arch_setup = mrst_arch_setup;
x86_cpuinit.setup_percpu_clockev = mrst_setup_secondary_clock;
x86_platform.calibrate_tsc = mrst_calibrate_tsc;