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authorDave Jones <davej@redhat.com>2011-05-20 02:51:07 +0400
committerDave Jones <davej@redhat.com>2011-05-20 02:51:07 +0400
commitbb0a56ecc4ba2a3db1b6ea6949c309886e3447d3 (patch)
tree680b1307d7d9c1a188b7483875f7a3287d8b51a0 /drivers/cpufreq/speedstep-lib.h
parent1a8e1463a49aaa452da1cefe184a00d4df47f1ef (diff)
downloadlinux-bb0a56ecc4ba2a3db1b6ea6949c309886e3447d3.tar.xz
[CPUFREQ] Move x86 drivers to drivers/cpufreq/
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq/speedstep-lib.h')
-rw-r--r--drivers/cpufreq/speedstep-lib.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/cpufreq/speedstep-lib.h b/drivers/cpufreq/speedstep-lib.h
new file mode 100644
index 000000000000..70d9cea1219d
--- /dev/null
+++ b/drivers/cpufreq/speedstep-lib.h
@@ -0,0 +1,49 @@
+/*
+ * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
+ *
+ * Licensed under the terms of the GNU GPL License version 2.
+ *
+ * Library for common functions for Intel SpeedStep v.1 and v.2 support
+ *
+ * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
+ */
+
+
+
+/* processors */
+enum speedstep_processor {
+ SPEEDSTEP_CPU_PIII_C_EARLY = 0x00000001, /* Coppermine core */
+ SPEEDSTEP_CPU_PIII_C = 0x00000002, /* Coppermine core */
+ SPEEDSTEP_CPU_PIII_T = 0x00000003, /* Tualatin core */
+ SPEEDSTEP_CPU_P4M = 0x00000004, /* P4-M */
+/* the following processors are not speedstep-capable and are not auto-detected
+ * in speedstep_detect_processor(). However, their speed can be detected using
+ * the speedstep_get_frequency() call. */
+ SPEEDSTEP_CPU_PM = 0xFFFFFF03, /* Pentium M */
+ SPEEDSTEP_CPU_P4D = 0xFFFFFF04, /* desktop P4 */
+ SPEEDSTEP_CPU_PCORE = 0xFFFFFF05, /* Core */
+};
+
+/* speedstep states -- only two of them */
+
+#define SPEEDSTEP_HIGH 0x00000000
+#define SPEEDSTEP_LOW 0x00000001
+
+
+/* detect a speedstep-capable processor */
+extern enum speedstep_processor speedstep_detect_processor(void);
+
+/* detect the current speed (in khz) of the processor */
+extern unsigned int speedstep_get_frequency(enum speedstep_processor processor);
+
+
+/* detect the low and high speeds of the processor. The callback
+ * set_state"'s first argument is either SPEEDSTEP_HIGH or
+ * SPEEDSTEP_LOW; the second argument is zero so that no
+ * cpufreq_notify_transition calls are initiated.
+ */
+extern unsigned int speedstep_get_freqs(enum speedstep_processor processor,
+ unsigned int *low_speed,
+ unsigned int *high_speed,
+ unsigned int *transition_latency,
+ void (*set_state) (unsigned int state));