1 files changed, 176 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
new file mode 100644
index 000000000000..63ebc8470f52
--- /dev/null
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
@@ -0,0 +1,176 @@
+/*
+ *  (c) 2003, 2004 Advanced Micro Devices, Inc.
+ *  Your use of this code is subject to the terms and conditions of the
+ *  GNU general public license version 2. See "COPYING" or
+ *  http://www.gnu.org/licenses/gpl.html
+ */
+
+struct powernow_k8_data {
+        unsigned int cpu;
+
+        u32 numps;  /* number of p-states */
+        u32 batps;  /* number of p-states supported on battery */
+
+        /* these values are constant when the PSB is used to determine
+         * vid/fid pairings, but are modified during the ->target() call
+         * when ACPI is used */
+        u32 rvo;     /* ramp voltage offset */
+        u32 irt;     /* isochronous relief time */
+        u32 vidmvs;  /* usable value calculated from mvs */
+        u32 vstable; /* voltage stabilization time, units 20 us */
+        u32 plllock; /* pll lock time, units 1 us */
+
+        /* keep track of the current fid / vid */
+        u32 currvid, currfid;
+
+        /* the powernow_table includes all frequency and vid/fid pairings:
+         * fid are the lower 8 bits of the index, vid are the upper 8 bits.
+         * frequency is in kHz */
+        struct cpufreq_frequency_table  *powernow_table;
+
+#ifdef CONFIG_X86_POWERNOW_K8_ACPI
+        /* the acpi table needs to be kept. it's only available if ACPI was
+         * used to determine valid frequency/vid/fid states */
+        struct acpi_processor_performance acpi_data;
+#endif
+};
+
+
+/* processor's cpuid instruction support */
+#define CPUID_PROCESSOR_SIGNATURE       1       /* function 1 */
+#define CPUID_XFAM                      0x0ff00000      /* extended family */
+#define CPUID_XFAM_K8                   0
+#define CPUID_XMOD                      0x000f0000      /* extended model */
+#define CPUID_XMOD_REV_E                0x00020000
+#define CPUID_USE_XFAM_XMOD             0x00000f00
+#define CPUID_GET_MAX_CAPABILITIES      0x80000000
+#define CPUID_FREQ_VOLT_CAPABILITIES    0x80000007
+#define P_STATE_TRANSITION_CAPABLE      6
+
+/* Model Specific Registers for p-state transitions. MSRs are 64-bit. For     */
+/* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and   */
+/* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */
+/* the register number is placed in ecx, and the data is returned in edx:eax. */
+
+#define MSR_FIDVID_CTL      0xc0010041
+#define MSR_FIDVID_STATUS   0xc0010042
+
+/* Field definitions within the FID VID Low Control MSR : */
+#define MSR_C_LO_INIT_FID_VID     0x00010000
+#define MSR_C_LO_NEW_VID          0x00001f00
+#define MSR_C_LO_NEW_FID          0x0000002f
+#define MSR_C_LO_VID_SHIFT        8
+
+/* Field definitions within the FID VID High Control MSR : */
+#define MSR_C_HI_STP_GNT_TO       0x000fffff
+
+/* Field definitions within the FID VID Low Status MSR : */
+#define MSR_S_LO_CHANGE_PENDING   0x80000000    /* cleared when completed */
+#define MSR_S_LO_MAX_RAMP_VID     0x1f000000
+#define MSR_S_LO_MAX_FID          0x003f0000
+#define MSR_S_LO_START_FID        0x00003f00
+#define MSR_S_LO_CURRENT_FID      0x0000003f
+
+/* Field definitions within the FID VID High Status MSR : */
+#define MSR_S_HI_MAX_WORKING_VID  0x001f0000
+#define MSR_S_HI_START_VID        0x00001f00
+#define MSR_S_HI_CURRENT_VID      0x0000001f
+#define MSR_C_HI_STP_GNT_BENIGN   0x00000001
+
+/*
+ * There are restrictions frequencies have to follow:
+ * - only 1 entry in the low fid table ( <=1.4GHz )
+ * - lowest entry in the high fid table must be >= 2 * the entry in the
+ *   low fid table
+ * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
+ *   in the low fid table
+ * - the parts can only step at 200 MHz intervals, so 1.9 GHz is never valid
+ * - lowest frequency must be >= interprocessor hypertransport link speed
+ *   (only applies to MP systems obviously)
+ */
+
+/* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
+#define LO_FID_TABLE_TOP     6  /* fid values marking the boundary    */
+#define HI_FID_TABLE_BOTTOM  8  /* between the low and high tables    */
+
+#define LO_VCOFREQ_TABLE_TOP    1400    /* corresponding vco frequency values */
+#define HI_VCOFREQ_TABLE_BOTTOM 1600
+
+#define MIN_FREQ_RESOLUTION  200 /* fids jump by 2 matching freq jumps by 200 */
+
+#define MAX_FID 0x2a    /* Spec only gives FID values as far as 5 GHz */
+#define LEAST_VID 0x1e  /* Lowest (numerically highest) useful vid value */
+
+#define MIN_FREQ 800    /* Min and max freqs, per spec */
+#define MAX_FREQ 5000
+
+#define INVALID_FID_MASK 0xffffffc1  /* not a valid fid if these bits are set */
+#define INVALID_VID_MASK 0xffffffe0  /* not a valid vid if these bits are set */
+
+#define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */
+
+#define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */
+
+#define MAXIMUM_VID_STEPS 1  /* Current cpus only allow a single step of 25mV */
+#define VST_UNITS_20US 20   /* Voltage Stabalization Time is in units of 20us */
+
+/*
+ * Most values of interest are enocoded in a single field of the _PSS
+ * entries: the "control" value.
+ */
+                                                                                                    
+#define IRT_SHIFT      30
+#define RVO_SHIFT      28
+#define PLL_L_SHIFT    20
+#define MVS_SHIFT      18
+#define VST_SHIFT      11
+#define VID_SHIFT       6
+#define IRT_MASK        3
+#define RVO_MASK        3
+#define PLL_L_MASK   0x7f
+#define MVS_MASK        3
+#define VST_MASK     0x7f
+#define VID_MASK     0x1f
+#define FID_MASK     0x3f
+
+
+/*
+ * Version 1.4 of the PSB table. This table is constructed by BIOS and is
+ * to tell the OS's power management driver which VIDs and FIDs are
+ * supported by this particular processor.
+ * If the data in the PSB / PST is wrong, then this driver will program the
+ * wrong values into hardware, which is very likely to lead to a crash.
+ */
+
+#define PSB_ID_STRING      "AMDK7PNOW!"
+#define PSB_ID_STRING_LEN  10
+
+#define PSB_VERSION_1_4  0x14
+
+struct psb_s {
+        u8 signature[10];
+        u8 tableversion;
+        u8 flags1;
+        u16 vstable;
+        u8 flags2;
+        u8 num_tables;
+        u32 cpuid;
+        u8 plllocktime;
+        u8 maxfid;
+        u8 maxvid;
+        u8 numps;
+};
+
+/* Pairs of fid/vid values are appended to the version 1.4 PSB table. */
+struct pst_s {
+        u8 fid;
+        u8 vid;
+};
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg)
+
+static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid);
+static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
+static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
+
+static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);