Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / platform / intel-mid / mfld.c

diff --git a/kernel/arch/x86/platform/intel-mid/mfld.c b/kernel/arch/x86/platform/intel-mid/mfld.c
new file mode 100644 (file)
index 0000000..23381d2
--- /dev/null
+++ b/kernel/arch/x86/platform/intel-mid/mfld.c
@@ -0,0 +1,75 @@
+/*
+ * mfld.c: Intel Medfield platform setup code
+ *
+ * (C) Copyright 2013 Intel Corporation
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+
+#include <asm/apic.h>
+#include <asm/intel-mid.h>
+#include <asm/intel_mid_vrtc.h>
+
+#include "intel_mid_weak_decls.h"
+
+static void penwell_arch_setup(void);
+/* penwell arch ops */
+static struct intel_mid_ops penwell_ops = {
+       .arch_setup = penwell_arch_setup,
+};
+
+static void mfld_power_off(void)
+{
+}
+
+static unsigned long __init mfld_calibrate_tsc(void)
+{
+       unsigned long fast_calibrate;
+       u32 lo, hi, ratio, fsb;
+
+       rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
+       pr_debug("IA32 perf status is 0x%x, 0x%0x\n", lo, hi);
+       ratio = (hi >> 8) & 0x1f;
+       pr_debug("ratio is %d\n", ratio);
+       if (!ratio) {
+               pr_err("read a zero ratio, should be incorrect!\n");
+               pr_err("force tsc ratio to 16 ...\n");
+               ratio = 16;
+       }
+       rdmsr(MSR_FSB_FREQ, lo, hi);
+       if ((lo & 0x7) == 0x7)
+               fsb = FSB_FREQ_83SKU;
+       else
+               fsb = FSB_FREQ_100SKU;
+       fast_calibrate = ratio * fsb;
+       pr_debug("read penwell tsc %lu khz\n", fast_calibrate);
+       lapic_timer_frequency = fsb * 1000 / HZ;
+       /* mark tsc clocksource as reliable */
+       set_cpu_cap(&boot_cpu_data, X86_FEATURE_TSC_RELIABLE);
+
+       if (fast_calibrate)
+               return fast_calibrate;
+
+       return 0;
+}
+
+static void __init penwell_arch_setup(void)
+{
+       x86_platform.calibrate_tsc = mfld_calibrate_tsc;
+       pm_power_off = mfld_power_off;
+}
+
+void *get_penwell_ops(void)
+{
+       return &penwell_ops;
+}
+
+void *get_cloverview_ops(void)
+{
+       return &penwell_ops;
+}