linux/drivers/cpufreq/powernow-k8.h
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   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
   8enum pstate {
   9        HW_PSTATE_INVALID = 0xff,
  10        HW_PSTATE_0 = 0,
  11        HW_PSTATE_1 = 1,
  12        HW_PSTATE_2 = 2,
  13        HW_PSTATE_3 = 3,
  14        HW_PSTATE_4 = 4,
  15        HW_PSTATE_5 = 5,
  16        HW_PSTATE_6 = 6,
  17        HW_PSTATE_7 = 7,
  18};
  19
  20struct powernow_k8_data {
  21        unsigned int cpu;
  22
  23        u32 numps;  /* number of p-states */
  24        u32 batps;  /* number of p-states supported on battery */
  25        u32 max_hw_pstate; /* maximum legal hardware pstate */
  26
  27        /* these values are constant when the PSB is used to determine
  28         * vid/fid pairings, but are modified during the ->target() call
  29         * when ACPI is used */
  30        u32 rvo;     /* ramp voltage offset */
  31        u32 irt;     /* isochronous relief time */
  32        u32 vidmvs;  /* usable value calculated from mvs */
  33        u32 vstable; /* voltage stabilization time, units 20 us */
  34        u32 plllock; /* pll lock time, units 1 us */
  35        u32 exttype; /* extended interface = 1 */
  36
  37        /* keep track of the current fid / vid or pstate */
  38        u32 currvid;
  39        u32 currfid;
  40        enum pstate currpstate;
  41
  42        /* the powernow_table includes all frequency and vid/fid pairings:
  43         * fid are the lower 8 bits of the index, vid are the upper 8 bits.
  44         * frequency is in kHz */
  45        struct cpufreq_frequency_table  *powernow_table;
  46
  47        /* the acpi table needs to be kept. it's only available if ACPI was
  48         * used to determine valid frequency/vid/fid states */
  49        struct acpi_processor_performance acpi_data;
  50
  51        /* we need to keep track of associated cores, but let cpufreq
  52         * handle hotplug events - so just point at cpufreq pol->cpus
  53         * structure */
  54        struct cpumask *available_cores;
  55};
  56
  57/* processor's cpuid instruction support */
  58#define CPUID_PROCESSOR_SIGNATURE       1       /* function 1 */
  59#define CPUID_XFAM                      0x0ff00000      /* extended family */
  60#define CPUID_XFAM_K8                   0
  61#define CPUID_XMOD                      0x000f0000      /* extended model */
  62#define CPUID_XMOD_REV_MASK             0x000c0000
  63#define CPUID_XFAM_10H                  0x00100000      /* family 0x10 */
  64#define CPUID_USE_XFAM_XMOD             0x00000f00
  65#define CPUID_GET_MAX_CAPABILITIES      0x80000000
  66#define CPUID_FREQ_VOLT_CAPABILITIES    0x80000007
  67#define P_STATE_TRANSITION_CAPABLE      6
  68
  69/* Model Specific Registers for p-state transitions. MSRs are 64-bit. For     */
  70/* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and   */
  71/* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */
  72/* the register number is placed in ecx, and the data is returned in edx:eax. */
  73
  74#define MSR_FIDVID_CTL      0xc0010041
  75#define MSR_FIDVID_STATUS   0xc0010042
  76
  77/* Field definitions within the FID VID Low Control MSR : */
  78#define MSR_C_LO_INIT_FID_VID     0x00010000
  79#define MSR_C_LO_NEW_VID          0x00003f00
  80#define MSR_C_LO_NEW_FID          0x0000003f
  81#define MSR_C_LO_VID_SHIFT        8
  82
  83/* Field definitions within the FID VID High Control MSR : */
  84#define MSR_C_HI_STP_GNT_TO       0x000fffff
  85
  86/* Field definitions within the FID VID Low Status MSR : */
  87#define MSR_S_LO_CHANGE_PENDING   0x80000000   /* cleared when completed */
  88#define MSR_S_LO_MAX_RAMP_VID     0x3f000000
  89#define MSR_S_LO_MAX_FID          0x003f0000
  90#define MSR_S_LO_START_FID        0x00003f00
  91#define MSR_S_LO_CURRENT_FID      0x0000003f
  92
  93/* Field definitions within the FID VID High Status MSR : */
  94#define MSR_S_HI_MIN_WORKING_VID  0x3f000000
  95#define MSR_S_HI_MAX_WORKING_VID  0x003f0000
  96#define MSR_S_HI_START_VID        0x00003f00
  97#define MSR_S_HI_CURRENT_VID      0x0000003f
  98#define MSR_C_HI_STP_GNT_BENIGN   0x00000001
  99
 100
 101/* Hardware Pstate _PSS and MSR definitions */
 102#define USE_HW_PSTATE           0x00000080
 103#define HW_PSTATE_MASK          0x00000007
 104#define HW_PSTATE_VALID_MASK    0x80000000
 105#define HW_PSTATE_MAX_MASK      0x000000f0
 106#define HW_PSTATE_MAX_SHIFT     4
 107#define MSR_PSTATE_DEF_BASE     0xc0010064 /* base of Pstate MSRs */
 108#define MSR_PSTATE_STATUS       0xc0010063 /* Pstate Status MSR */
 109#define MSR_PSTATE_CTRL         0xc0010062 /* Pstate control MSR */
 110#define MSR_PSTATE_CUR_LIMIT    0xc0010061 /* pstate current limit MSR */
 111
 112/* define the two driver architectures */
 113#define CPU_OPTERON 0
 114#define CPU_HW_PSTATE 1
 115
 116
 117/*
 118 * There are restrictions frequencies have to follow:
 119 * - only 1 entry in the low fid table ( <=1.4GHz )
 120 * - lowest entry in the high fid table must be >= 2 * the entry in the
 121 *   low fid table
 122 * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
 123 *   in the low fid table
 124 * - the parts can only step at <= 200 MHz intervals, odd fid values are
 125 *   supported in revision G and later revisions.
 126 * - lowest frequency must be >= interprocessor hypertransport link speed
 127 *   (only applies to MP systems obviously)
 128 */
 129
 130/* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
 131#define LO_FID_TABLE_TOP     7  /* fid values marking the boundary    */
 132#define HI_FID_TABLE_BOTTOM  8  /* between the low and high tables    */
 133
 134#define LO_VCOFREQ_TABLE_TOP    1400    /* corresponding vco frequency values */
 135#define HI_VCOFREQ_TABLE_BOTTOM 1600
 136
 137#define MIN_FREQ_RESOLUTION  200 /* fids jump by 2 matching freq jumps by 200 */
 138
 139#define MAX_FID 0x2a    /* Spec only gives FID values as far as 5 GHz */
 140#define LEAST_VID 0x3e  /* Lowest (numerically highest) useful vid value */
 141
 142#define MIN_FREQ 800    /* Min and max freqs, per spec */
 143#define MAX_FREQ 5000
 144
 145#define INVALID_FID_MASK 0xffffffc0  /* not a valid fid if these bits are set */
 146#define INVALID_VID_MASK 0xffffffc0  /* not a valid vid if these bits are set */
 147
 148#define VID_OFF 0x3f
 149
 150#define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */
 151
 152#define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */
 153
 154#define MAXIMUM_VID_STEPS 1  /* Current cpus only allow a single step of 25mV */
 155#define VST_UNITS_20US 20   /* Voltage Stabilization Time is in units of 20us */
 156
 157/*
 158 * Most values of interest are encoded in a single field of the _PSS
 159 * entries: the "control" value.
 160 */
 161
 162#define IRT_SHIFT      30
 163#define RVO_SHIFT      28
 164#define EXT_TYPE_SHIFT 27
 165#define PLL_L_SHIFT    20
 166#define MVS_SHIFT      18
 167#define VST_SHIFT      11
 168#define VID_SHIFT       6
 169#define IRT_MASK        3
 170#define RVO_MASK        3
 171#define EXT_TYPE_MASK   1
 172#define PLL_L_MASK   0x7f
 173#define MVS_MASK        3
 174#define VST_MASK     0x7f
 175#define VID_MASK     0x1f
 176#define FID_MASK     0x1f
 177#define EXT_VID_MASK 0x3f
 178#define EXT_FID_MASK 0x3f
 179
 180
 181/*
 182 * Version 1.4 of the PSB table. This table is constructed by BIOS and is
 183 * to tell the OS's power management driver which VIDs and FIDs are
 184 * supported by this particular processor.
 185 * If the data in the PSB / PST is wrong, then this driver will program the
 186 * wrong values into hardware, which is very likely to lead to a crash.
 187 */
 188
 189#define PSB_ID_STRING      "AMDK7PNOW!"
 190#define PSB_ID_STRING_LEN  10
 191
 192#define PSB_VERSION_1_4  0x14
 193
 194struct psb_s {
 195        u8 signature[10];
 196        u8 tableversion;
 197        u8 flags1;
 198        u16 vstable;
 199        u8 flags2;
 200        u8 num_tables;
 201        u32 cpuid;
 202        u8 plllocktime;
 203        u8 maxfid;
 204        u8 maxvid;
 205        u8 numps;
 206};
 207
 208/* Pairs of fid/vid values are appended to the version 1.4 PSB table. */
 209struct pst_s {
 210        u8 fid;
 211        u8 vid;
 212};
 213
 214static int core_voltage_pre_transition(struct powernow_k8_data *data,
 215        u32 reqvid, u32 regfid);
 216static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
 217static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
 218
 219static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
 220
 221static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
 222static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
 223
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