P-STATE: Add SFI p-state driver for Intel SoC

Forklifted from PSI Jellybean tree.

Signed-off-by: Fei Yang <fei.yang@intel.com>
[Ignore the changes of ondemand Governor for 3.10 kernel]
Signed-off-by: Srinidhi Kasagar <srinidhi.kasagar@intel.com>

4 files changed, 82 insertions, 1 deletions

diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 6bd63d63d35..2a9d25e893e 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -58,6 +58,21 @@ config X86_ACPI_CPUFREQ_CPB
 	  By enabling this option the acpi_cpufreq driver provides the old
 	  entry in addition to the new boost ones, for compatibility reasons.
 
+config X86_SFI_CPUFREQ
+	tristate "SFI Processor P-States driver"
+	select CPU_FREQ_TABLE
+	depends on SFI
+	help
+	  This driver adds a CPUFreq driver which utilizes the SFI
+	  Processor Performance States enumeration.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sfi-cpufreq.
+
+	  For details, take a look at <file:Documentation/cpu-freq/>.
+
+	  If in doubt, say N.
+
 config ELAN_CPUFREQ
 	tristate "AMD Elan SC400 and SC410"
 	select CPU_FREQ_TABLE
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 315b9231feb..b1c516f84e0 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_GENERIC_CPUFREQ_CPU0)	+= cpufreq-cpu0.o
 
 obj-$(CONFIG_X86_ACPI_CPUFREQ)		+= acpi-cpufreq.o mperf.o
 obj-$(CONFIG_X86_POWERNOW_K8)		+= powernow-k8.o
+obj-$(CONFIG_X86_SFI_CPUFREQ)		+= sfi-cpufreq.o mperf.o
 obj-$(CONFIG_X86_PCC_CPUFREQ)		+= pcc-cpufreq.o
 obj-$(CONFIG_X86_POWERNOW_K6)		+= powernow-k6.o
 obj-$(CONFIG_X86_POWERNOW_K7)		+= powernow-k7.o
diff --git a/drivers/cpufreq/sfi-cpufreq.c b/drivers/cpufreq/sfi-cpufreq.c
index fde419df9fa..2f9f9a2d2c7 100644
--- a/drivers/cpufreq/sfi-cpufreq.c
+++ b/drivers/cpufreq/sfi-cpufreq.c
@@ -1,7 +1,7 @@
 /*
  * sfi_cpufreq.c - sfi Processor P-States Driver
  *
- *
+ * (C) 2010-2011 Intel Corporation
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
diff --git a/drivers/cpufreq/sfi-cpufreq.h b/drivers/cpufreq/sfi-cpufreq.h
new file mode 100644
index 00000000000..7e01c1e73dc
--- /dev/null
+++ b/drivers/cpufreq/sfi-cpufreq.h
@@ -0,0 +1,65 @@
+/*
+ * sfi_processor.h
+ * Copyright (c) 2010, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef __SFI_PROCESSOR_H__
+#define __SFI_PROCESSOR_H__
+
+#include <linux/sfi.h>
+#include <linux/cpuidle.h>
+
+struct sfi_processor_power {
+	struct cpuidle_device dev;
+	u32 default_state;
+	int count;
+	struct cpuidle_state *states;
+	struct sfi_cstate_table_entry *sfi_cstates;
+};
+
+struct sfi_processor_flags {
+	u8 valid;
+	u8 power;
+};
+
+struct sfi_processor {
+	u32 id;
+	struct sfi_processor_flags flags;
+	struct sfi_processor_power power;
+	struct sfi_processor_performance *performance;
+};
+
+/* Performance management */
+struct sfi_processor_px {
+	u32 core_frequency;	/* megahertz */
+	u32 transition_latency;	/* microseconds */
+	u32 control;	/* control value */
+};
+
+struct sfi_processor_performance {
+	unsigned int state;
+	unsigned int state_count;
+	struct sfi_processor_px *states;
+};
+
+/* for communication between multiple parts of the processor kernel module */
+DECLARE_PER_CPU(struct sfi_processor *, sfi_processors);
+
+int sfi_processor_power_init(struct sfi_processor *pr);
+int sfi_processor_power_exit(struct sfi_processor *pr);
+
+#endif /*__SFI_PROCESSOR_H__*/