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@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>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
index e796448f0eb5..ceaebeb5866f 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;