drivers/cpufreq/powernow-k8.h - arm/linux - Git at Google

 /*
  *  (c) 2003-2006 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 */
 	u32 exttype; /* extended interface = 1 */

 	/* keep track of the current fid / vid or pstate */
 	u32 currvid;
 	u32 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;

 	/* 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;

 	/* we need to keep track of associated cores, but let cpufreq
 	 * handle hotplug events - so just point at cpufreq pol->cpus
 	 * structure */
 	struct cpumask *available_cores;
 };

 /* 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_MASK		0x000c0000
 #define CPUID_XFAM_10H			0x00100000	/* family 0x10 */
 #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          0x00003f00
 #define MSR_C_LO_NEW_FID          0x0000003f
 #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     0x3f000000
 #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_MIN_WORKING_VID  0x3f000000
 #define MSR_S_HI_MAX_WORKING_VID  0x003f0000
 #define MSR_S_HI_START_VID        0x00003f00
 #define MSR_S_HI_CURRENT_VID      0x0000003f
 #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, odd fid values are
  *   supported in revision G and later revisions.
  * - 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     7	/* 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 0x3e	/* Lowest (numerically highest) useful vid value */

 #define MIN_FREQ 800	/* Min and max freqs, per spec */
 #define MAX_FREQ 5000

 #define INVALID_FID_MASK 0xffffffc0  /* not a valid fid if these bits are set */
 #define INVALID_VID_MASK 0xffffffc0  /* not a valid vid if these bits are set */

 #define VID_OFF 0x3f

 #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 Stabilization Time is in units of 20us */

 /*
  * Most values of interest are encoded in a single field of the _PSS
  * entries: the "control" value.
  */

 #define IRT_SHIFT      30
 #define RVO_SHIFT      28
 #define EXT_TYPE_SHIFT 27
 #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 EXT_TYPE_MASK   1
 #define PLL_L_MASK   0x7f
 #define MVS_MASK        3
 #define VST_MASK     0x7f
 #define VID_MASK     0x1f
 #define FID_MASK     0x1f
 #define EXT_VID_MASK 0x3f
 #define EXT_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;
 };

 static int core_voltage_pre_transition(struct powernow_k8_data *data,
 	u32 reqvid, u32 regfid);
 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);

 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
	/*
	* (c) 2003-2006 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 */
	u32 exttype; /* extended interface = 1 */

	/* keep track of the current fid / vid or pstate */
	u32 currvid;
	u32 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;

	/* 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;

	/* we need to keep track of associated cores, but let cpufreq
	* handle hotplug events - so just point at cpufreq pol->cpus
	* structure */
	struct cpumask *available_cores;
	};

	/* 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_MASK 0x000c0000
	#define CPUID_XFAM_10H 0x00100000 /* family 0x10 */
	#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 0x00003f00
	#define MSR_C_LO_NEW_FID 0x0000003f
	#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 0x3f000000
	#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_MIN_WORKING_VID 0x3f000000
	#define MSR_S_HI_MAX_WORKING_VID 0x003f0000
	#define MSR_S_HI_START_VID 0x00003f00
	#define MSR_S_HI_CURRENT_VID 0x0000003f
	#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, odd fid values are
	* supported in revision G and later revisions.
	* - 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 7 /* 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 0x3e /* Lowest (numerically highest) useful vid value */

	#define MIN_FREQ 800 /* Min and max freqs, per spec */
	#define MAX_FREQ 5000

	#define INVALID_FID_MASK 0xffffffc0 /* not a valid fid if these bits are set */
	#define INVALID_VID_MASK 0xffffffc0 /* not a valid vid if these bits are set */

	#define VID_OFF 0x3f

	#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 Stabilization Time is in units of 20us */

	/*
	* Most values of interest are encoded in a single field of the _PSS
	* entries: the "control" value.
	*/

	#define IRT_SHIFT 30
	#define RVO_SHIFT 28
	#define EXT_TYPE_SHIFT 27
	#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 EXT_TYPE_MASK 1
	#define PLL_L_MASK 0x7f
	#define MVS_MASK 3
	#define VST_MASK 0x7f
	#define VID_MASK 0x1f
	#define FID_MASK 0x1f
	#define EXT_VID_MASK 0x3f
	#define EXT_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;
	};

	static int core_voltage_pre_transition(struct powernow_k8_data *data,
	u32 reqvid, u32 regfid);
	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);

	static int fill_powernow_table_fidvid(struct powernow_k8_data data, struct cpufreq_frequency_table powernow_table);