mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
4c5cdb1e1f
* master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Fix up whitespace in conservative governor. [CPUFREQ] Make cpufreq_conservative handle out-of-sync events properly [CPUFREQ] architectural pstate driver for powernow-k8
225 lines
7.7 KiB
C
225 lines
7.7 KiB
C
/*
|
|
* (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 */
|
|
u32 max_hw_pstate; /* maximum legal hardware pstate */
|
|
|
|
/* 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, currfid, currpstate;
|
|
|
|
/* 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
|
|
/* we need to keep track of associated cores, but let cpufreq
|
|
* handle hotplug events - so just point at cpufreq pol->cpus
|
|
* structure */
|
|
cpumask_t *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 0x00080000
|
|
#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
|
|
|
|
|
|
/* Hardware Pstate _PSS and MSR definitions */
|
|
#define USE_HW_PSTATE 0x00000080
|
|
#define HW_PSTATE_MASK 0x00000007
|
|
#define HW_PSTATE_VALID_MASK 0x80000000
|
|
#define HW_PSTATE_MAX_MASK 0x000000f0
|
|
#define HW_PSTATE_MAX_SHIFT 4
|
|
#define MSR_PSTATE_DEF_BASE 0xc0010064 /* base of Pstate MSRs */
|
|
#define MSR_PSTATE_STATUS 0xc0010063 /* Pstate Status MSR */
|
|
#define MSR_PSTATE_CTRL 0xc0010062 /* Pstate control MSR */
|
|
#define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
|
|
|
|
/* define the two driver architectures */
|
|
#define CPU_OPTERON 0
|
|
#define CPU_HW_PSTATE 1
|
|
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
|
|
#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);
|
|
|
|
#ifdef CONFIG_X86_POWERNOW_K8_ACPI
|
|
static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
|
|
static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
|
|
{
|
|
}
|
|
#else
|
|
static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
|
|
{
|
|
cpu_set(0, cpu_sharedcore_mask[0]);
|
|
}
|
|
#endif
|