1/* 2 * (c) 2003-2006 Advanced Micro Devices, Inc. 3 * Your use of this code is subject to the terms and conditions of the 4 * GNU general public license version 2. See "COPYING" or 5 * http://www.gnu.org/licenses/gpl.html 6 */ 7 8struct powernow_k8_data { 9 unsigned int cpu; 10 11 u32 numps; /* number of p-states */ 12 u32 batps; /* number of p-states supported on battery */ 13 14 /* these values are constant when the PSB is used to determine 15 * vid/fid pairings, but are modified during the ->target() call 16 * when ACPI is used */ 17 u32 rvo; /* ramp voltage offset */ 18 u32 irt; /* isochronous relief time */ 19 u32 vidmvs; /* usable value calculated from mvs */ 20 u32 vstable; /* voltage stabilization time, units 20 us */ 21 u32 plllock; /* pll lock time, units 1 us */ 22 u32 exttype; /* extended interface = 1 */ 23 24 /* keep track of the current fid / vid or pstate */ 25 u32 currvid; 26 u32 currfid; 27 28 /* the powernow_table includes all frequency and vid/fid pairings: 29 * fid are the lower 8 bits of the index, vid are the upper 8 bits. 30 * frequency is in kHz */ 31 struct cpufreq_frequency_table *powernow_table; 32 33 /* the acpi table needs to be kept. it's only available if ACPI was 34 * used to determine valid frequency/vid/fid states */ 35 struct acpi_processor_performance acpi_data; 36 37 /* we need to keep track of associated cores, but let cpufreq 38 * handle hotplug events - so just point at cpufreq pol->cpus 39 * structure */ 40 struct cpumask *available_cores; 41}; 42 43/* processor's cpuid instruction support */ 44#define CPUID_PROCESSOR_SIGNATURE 1 /* function 1 */ 45#define CPUID_XFAM 0x0ff00000 /* extended family */ 46#define CPUID_XFAM_K8 0 47#define CPUID_XMOD 0x000f0000 /* extended model */ 48#define CPUID_XMOD_REV_MASK 0x000c0000 49#define CPUID_XFAM_10H 0x00100000 /* family 0x10 */ 50#define CPUID_USE_XFAM_XMOD 0x00000f00 51#define CPUID_GET_MAX_CAPABILITIES 0x80000000 52#define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007 53#define P_STATE_TRANSITION_CAPABLE 6 54 55/* Model Specific Registers for p-state transitions. MSRs are 64-bit. For */ 56/* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and */ 57/* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */ 58/* the register number is placed in ecx, and the data is returned in edx:eax. */ 59 60#define MSR_FIDVID_CTL 0xc0010041 61#define MSR_FIDVID_STATUS 0xc0010042 62 63/* Field definitions within the FID VID Low Control MSR : */ 64#define MSR_C_LO_INIT_FID_VID 0x00010000 65#define MSR_C_LO_NEW_VID 0x00003f00 66#define MSR_C_LO_NEW_FID 0x0000003f 67#define MSR_C_LO_VID_SHIFT 8 68 69/* Field definitions within the FID VID High Control MSR : */ 70#define MSR_C_HI_STP_GNT_TO 0x000fffff 71 72/* Field definitions within the FID VID Low Status MSR : */ 73#define MSR_S_LO_CHANGE_PENDING 0x80000000 /* cleared when completed */ 74#define MSR_S_LO_MAX_RAMP_VID 0x3f000000 75#define MSR_S_LO_MAX_FID 0x003f0000 76#define MSR_S_LO_START_FID 0x00003f00 77#define MSR_S_LO_CURRENT_FID 0x0000003f 78 79/* Field definitions within the FID VID High Status MSR : */ 80#define MSR_S_HI_MIN_WORKING_VID 0x3f000000 81#define MSR_S_HI_MAX_WORKING_VID 0x003f0000 82#define MSR_S_HI_START_VID 0x00003f00 83#define MSR_S_HI_CURRENT_VID 0x0000003f 84#define MSR_C_HI_STP_GNT_BENIGN 0x00000001 85 86/* 87 * There are restrictions frequencies have to follow: 88 * - only 1 entry in the low fid table ( <=1.4GHz ) 89 * - lowest entry in the high fid table must be >= 2 * the entry in the 90 * low fid table 91 * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry 92 * in the low fid table 93 * - the parts can only step at <= 200 MHz intervals, odd fid values are 94 * supported in revision G and later revisions. 95 * - lowest frequency must be >= interprocessor hypertransport link speed 96 * (only applies to MP systems obviously) 97 */ 98 99/* fids (frequency identifiers) are arranged in 2 tables - lo and hi */ 100#define LO_FID_TABLE_TOP 7 /* fid values marking the boundary */ 101#define HI_FID_TABLE_BOTTOM 8 /* between the low and high tables */ 102 103#define LO_VCOFREQ_TABLE_TOP 1400 /* corresponding vco frequency values */ 104#define HI_VCOFREQ_TABLE_BOTTOM 1600 105 106#define MIN_FREQ_RESOLUTION 200 /* fids jump by 2 matching freq jumps by 200 */ 107 108#define MAX_FID 0x2a /* Spec only gives FID values as far as 5 GHz */ 109#define LEAST_VID 0x3e /* Lowest (numerically highest) useful vid value */ 110 111#define MIN_FREQ 800 /* Min and max freqs, per spec */ 112#define MAX_FREQ 5000 113 114#define INVALID_FID_MASK 0xffffffc0 /* not a valid fid if these bits are set */ 115#define INVALID_VID_MASK 0xffffffc0 /* not a valid vid if these bits are set */ 116 117#define VID_OFF 0x3f 118 119#define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */ 120 121#define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */ 122 123#define MAXIMUM_VID_STEPS 1 /* Current cpus only allow a single step of 25mV */ 124#define VST_UNITS_20US 20 /* Voltage Stabilization Time is in units of 20us */ 125 126/* 127 * Most values of interest are encoded in a single field of the _PSS 128 * entries: the "control" value. 129 */ 130 131#define IRT_SHIFT 30 132#define RVO_SHIFT 28 133#define EXT_TYPE_SHIFT 27 134#define PLL_L_SHIFT 20 135#define MVS_SHIFT 18 136#define VST_SHIFT 11 137#define VID_SHIFT 6 138#define IRT_MASK 3 139#define RVO_MASK 3 140#define EXT_TYPE_MASK 1 141#define PLL_L_MASK 0x7f 142#define MVS_MASK 3 143#define VST_MASK 0x7f 144#define VID_MASK 0x1f 145#define FID_MASK 0x1f 146#define EXT_VID_MASK 0x3f 147#define EXT_FID_MASK 0x3f 148 149 150/* 151 * Version 1.4 of the PSB table. This table is constructed by BIOS and is 152 * to tell the OS's power management driver which VIDs and FIDs are 153 * supported by this particular processor. 154 * If the data in the PSB / PST is wrong, then this driver will program the 155 * wrong values into hardware, which is very likely to lead to a crash. 156 */ 157 158#define PSB_ID_STRING "AMDK7PNOW!" 159#define PSB_ID_STRING_LEN 10 160 161#define PSB_VERSION_1_4 0x14 162 163struct psb_s { 164 u8 signature[10]; 165 u8 tableversion; 166 u8 flags1; 167 u16 vstable; 168 u8 flags2; 169 u8 num_tables; 170 u32 cpuid; 171 u8 plllocktime; 172 u8 maxfid; 173 u8 maxvid; 174 u8 numps; 175}; 176 177/* Pairs of fid/vid values are appended to the version 1.4 PSB table. */ 178struct pst_s { 179 u8 fid; 180 u8 vid; 181}; 182 183static int core_voltage_pre_transition(struct powernow_k8_data *data, 184 u32 reqvid, u32 regfid); 185static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid); 186static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid); 187 188static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index); 189 190static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table); 191