arch/x86/kernel/cpu/cpufreq/powernow-k8.h

   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
   8 struct 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         u32 max_hw_pstate; /* maximum legal hardware pstate */
  14
  15         /* these values are constant when the PSB is used to determine
  16          * vid/fid pairings, but are modified during the ->target() call
  17          * when ACPI is used */
  18         u32 rvo;     /* ramp voltage offset */
  19         u32 irt;     /* isochronous relief time */
  20         u32 vidmvs;  /* usable value calculated from mvs */
  21         u32 vstable; /* voltage stabilization time, units 20 us */
  22         u32 plllock; /* pll lock time, units 1 us */
  23         u32 exttype; /* extended interface = 1 */
  24
  25         /* keep track of the current fid / vid or pstate */
  26         u32 currvid, currfid, currpstate;
  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 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
  34         /* the acpi table needs to be kept. it's only available if ACPI was
  35          * used to determine valid frequency/vid/fid states */
  36         struct acpi_processor_performance *acpi_data;
  37 #endif
  38         /* we need to keep track of associated cores, but let cpufreq
  39          * handle hotplug events - so just point at cpufreq pol->cpus
  40          * structure */
  41         cpumask_t *available_cores;
  42         cpumask_t starting_core_affinity;
  43 };
  44
  45
  46 /* processor's cpuid instruction support */
  47 #define CPUID_PROCESSOR_SIGNATURE       1       /* function 1 */
  48 #define CPUID_XFAM                      0x0ff00000      /* extended family */
  49 #define CPUID_XFAM_K8                   0
  50 #define CPUID_XMOD                      0x000f0000      /* extended model */
  51 #define CPUID_XMOD_REV_MASK             0x000c0000
  52 #define CPUID_XFAM_10H                  0x00100000      /* family 0x10 */
  53 #define CPUID_USE_XFAM_XMOD             0x00000f00
  54 #define CPUID_GET_MAX_CAPABILITIES      0x80000000
  55 #define CPUID_FREQ_VOLT_CAPABILITIES    0x80000007
  56 #define P_STATE_TRANSITION_CAPABLE      6
  57
  58 /* Model Specific Registers for p-state transitions. MSRs are 64-bit. For     */
  59 /* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and   */
  60 /* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */
  61 /* the register number is placed in ecx, and the data is returned in edx:eax. */
  62
  63 #define MSR_FIDVID_CTL      0xc0010041
  64 #define MSR_FIDVID_STATUS   0xc0010042
  65
  66 /* Field definitions within the FID VID Low Control MSR : */
  67 #define MSR_C_LO_INIT_FID_VID     0x00010000
  68 #define MSR_C_LO_NEW_VID          0x00003f00
  69 #define MSR_C_LO_NEW_FID          0x0000003f
  70 #define MSR_C_LO_VID_SHIFT        8
  71
  72 /* Field definitions within the FID VID High Control MSR : */
  73 #define MSR_C_HI_STP_GNT_TO       0x000fffff
  74
  75 /* Field definitions within the FID VID Low Status MSR : */
  76 #define MSR_S_LO_CHANGE_PENDING   0x80000000   /* cleared when completed */
  77 #define MSR_S_LO_MAX_RAMP_VID     0x3f000000
  78 #define MSR_S_LO_MAX_FID          0x003f0000
  79 #define MSR_S_LO_START_FID        0x00003f00
  80 #define MSR_S_LO_CURRENT_FID      0x0000003f
  81
  82 /* Field definitions within the FID VID High Status MSR : */
  83 #define MSR_S_HI_MIN_WORKING_VID  0x3f000000
  84 #define MSR_S_HI_MAX_WORKING_VID  0x003f0000
  85 #define MSR_S_HI_START_VID        0x00003f00
  86 #define MSR_S_HI_CURRENT_VID      0x0000003f
  87 #define MSR_C_HI_STP_GNT_BENIGN   0x00000001
  88
  89
  90 /* Hardware Pstate _PSS and MSR definitions */
  91 #define USE_HW_PSTATE           0x00000080
  92 #define HW_PSTATE_MASK          0x00000007
  93 #define HW_PSTATE_VALID_MASK    0x80000000
  94 #define HW_PSTATE_MAX_MASK      0x000000f0
  95 #define HW_PSTATE_MAX_SHIFT     4
  96 #define MSR_PSTATE_DEF_BASE     0xc0010064 /* base of Pstate MSRs */
  97 #define MSR_PSTATE_STATUS       0xc0010063 /* Pstate Status MSR */
  98 #define MSR_PSTATE_CTRL         0xc0010062 /* Pstate control MSR */
  99 #define MSR_PSTATE_CUR_LIMIT    0xc0010061 /* pstate current limit MSR */
 100
 101 /* define the two driver architectures */
 102 #define CPU_OPTERON 0
 103 #define CPU_HW_PSTATE 1
 104
 105
 106 /*
 107  * There are restrictions frequencies have to follow:
 108  * - only 1 entry in the low fid table ( <=1.4GHz )
 109  * - lowest entry in the high fid table must be >= 2 * the entry in the
 110  *   low fid table
 111  * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
 112  *   in the low fid table
 113  * - the parts can only step at <= 200 MHz intervals, odd fid values are
 114  *   supported in revision G and later revisions.
 115  * - lowest frequency must be >= interprocessor hypertransport link speed
 116  *   (only applies to MP systems obviously)
 117  */
 118
 119 /* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
 120 #define LO_FID_TABLE_TOP     7  /* fid values marking the boundary    */
 121 #define HI_FID_TABLE_BOTTOM  8  /* between the low and high tables    */
 122
 123 #define LO_VCOFREQ_TABLE_TOP    1400    /* corresponding vco frequency values */
 124 #define HI_VCOFREQ_TABLE_BOTTOM 1600
 125
 126 #define MIN_FREQ_RESOLUTION  200 /* fids jump by 2 matching freq jumps by 200 */
 127
 128 #define MAX_FID 0x2a    /* Spec only gives FID values as far as 5 GHz */
 129 #define LEAST_VID 0x3e  /* Lowest (numerically highest) useful vid value */
 130
 131 #define MIN_FREQ 800    /* Min and max freqs, per spec */
 132 #define MAX_FREQ 5000
 133
 134 #define INVALID_FID_MASK 0xffffffc0  /* not a valid fid if these bits are set */
 135 #define INVALID_VID_MASK 0xffffffc0  /* not a valid vid if these bits are set */
 136
 137 #define VID_OFF 0x3f
 138
 139 #define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */
 140
 141 #define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */
 142
 143 #define MAXIMUM_VID_STEPS 1  /* Current cpus only allow a single step of 25mV */
 144 #define VST_UNITS_20US 20   /* Voltage Stabilization Time is in units of 20us */
 145
 146 /*
 147  * Most values of interest are encoded in a single field of the _PSS
 148  * entries: the "control" value.
 149  */
 150
 151 #define IRT_SHIFT      30
 152 #define RVO_SHIFT      28
 153 #define EXT_TYPE_SHIFT 27
 154 #define PLL_L_SHIFT    20
 155 #define MVS_SHIFT      18
 156 #define VST_SHIFT      11
 157 #define VID_SHIFT       6
 158 #define IRT_MASK        3
 159 #define RVO_MASK        3
 160 #define EXT_TYPE_MASK   1
 161 #define PLL_L_MASK   0x7f
 162 #define MVS_MASK        3
 163 #define VST_MASK     0x7f
 164 #define VID_MASK     0x1f
 165 #define FID_MASK     0x1f
 166 #define EXT_VID_MASK 0x3f
 167 #define EXT_FID_MASK 0x3f
 168
 169
 170 /*
 171  * Version 1.4 of the PSB table. This table is constructed by BIOS and is
 172  * to tell the OS's power management driver which VIDs and FIDs are
 173  * supported by this particular processor.
 174  * If the data in the PSB / PST is wrong, then this driver will program the
 175  * wrong values into hardware, which is very likely to lead to a crash.
 176  */
 177
 178 #define PSB_ID_STRING      "AMDK7PNOW!"
 179 #define PSB_ID_STRING_LEN  10
 180
 181 #define PSB_VERSION_1_4  0x14
 182
 183 struct psb_s {
 184         u8 signature[10];
 185         u8 tableversion;
 186         u8 flags1;
 187         u16 vstable;
 188         u8 flags2;
 189         u8 num_tables;
 190         u32 cpuid;
 191         u8 plllocktime;
 192         u8 maxfid;
 193         u8 maxvid;
 194         u8 numps;
 195 };
 196
 197 /* Pairs of fid/vid values are appended to the version 1.4 PSB table. */
 198 struct pst_s {
 199         u8 fid;
 200         u8 vid;
 201 };
 202
 203 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg)
 204
 205 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid);
 206 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
 207 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
 208
 209 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
 210
 211 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
 212 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
 213 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
 214 #endif
 215
 216 #ifdef CONFIG_SMP
 217 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
 218 {
 219 }
 220 #else
 221 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
 222 {
 223         cpu_set(0, cpu_sharedcore_mask[0]);
 224 }
 225 #endif