Commit-ID: a0c173bd8a3fd0541be8e4ef962170e48d8811c7
Gitweb: http://git.kernel.org/tip/a0c173bd8a3fd0541be8e4ef962170e48d8811c7
Author: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 19 May 2010 12:01:24 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Wed, 19 May 2010 13:32:29 -0700
x86, mrst: add cpu type detection
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@xxxxxxxxxxxxxxx>
LKML-Reference: <1274295685-6774-3-git-send-email-jacob.jun.pan@xxxxxxxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/mrst.h | 19 +++++++++++++++++++
arch/x86/kernel/mrst.c | 26 ++++++++++++++++++++++++++
2 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index 451d30e..dc5c850 100644
--- a/arch/x86/include/asm/mrst.h
+++ b/arch/x86/include/asm/mrst.h
@@ -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
diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
index e796448..ceaebeb 100644
--- a/arch/x86/kernel/mrst.c
+++ b/arch/x86/kernel/mrst.c
@@ -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;
--
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