osfmk/ppc/pmsCPU.c

   1 /*
   2  * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 #include <ppc/machine_routines.h>
  31 #include <ppc/machine_cpu.h>
  32 #include <ppc/exception.h>
  33 #include <ppc/misc_protos.h>
  34 #include <ppc/Firmware.h>
  35 #include <ppc/pmap.h>
  36 #include <ppc/asm.h>
  37 #include <ppc/proc_reg.h>
  38 #include <kern/pms.h>
  39 #include <ppc/savearea.h>
  40 #include <ppc/Diagnostics.h>
  41 #include <kern/processor.h>
  42
  43
  44 static void pmsCPURemote(uint32_t nstep);
  45
  46
  47 pmsDef pmsDefault[] = {
  48         {
  49                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  50                 .pmsStepID = pmsIdle,                                                   /* Unique identifier to this step */
  51                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  52                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  53                 .pmsDown = pmsIdle,                                                             /* We stay here */
  54                 .pmsNext = pmsNorm                                                              /* Next step */
  55         },
  56         {
  57                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  58                 .pmsStepID = pmsNorm,                                                   /* Unique identifier to this step */
  59                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  60                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  61                 .pmsDown = pmsIdle,                                                             /* Down to idle */
  62                 .pmsNext = pmsNorm                                                              /* Next step */
  63         },
  64         {
  65                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  66                 .pmsStepID = pmsNormHigh,                                               /* Unique identifier to this step */
  67                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  68                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  69                 .pmsDown = pmsIdle,                                                             /* Down to idle */
  70                 .pmsNext = pmsNormHigh                                                  /* Next step */
  71         },
  72         {
  73                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  74                 .pmsStepID = pmsBoost,                                                  /* Unique identifier to this step */
  75                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  76                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  77                 .pmsDown = pmsIdle,                                                             /* Step down */
  78                 .pmsNext = pmsBoost                                                             /* Next step */
  79         },
  80         {
  81                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  82                 .pmsStepID = pmsLow,                                                    /* Unique identifier to this step */
  83                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  84                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  85                 .pmsDown = pmsLow,                                                              /* We always stay here */
  86                 .pmsNext = pmsLow                                                               /* We always stay here */
  87         },
  88         {
  89                 .pmsLimit = century,                                                    /* We can normally stay here for 100 years */
  90                 .pmsStepID = pmsHigh,                                                   /* Unique identifier to this step */
  91                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
  92                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
  93                 .pmsDown = pmsHigh,                                                             /* We always stay here */
  94                 .pmsNext = pmsHigh                                                              /* We always stay here */
  95         },
  96         {
  97                 .pmsLimit = 0,                                                                  /* Time doesn't matter for a prepare for change */
  98                 .pmsStepID = pmsPrepCng,                                                /* Unique identifier to this step */
  99                 .pmsSetCmd = pmsParkIt,                                                 /* Force us to be parked */
 100                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
 101                 .pmsDown = pmsPrepCng,                                                  /* We always stay here */
 102                 .pmsNext = pmsPrepCng                                                   /* We always stay here */
 103         },
 104         {
 105                 .pmsLimit = 0,                                                                  /* Time doesn't matter for a prepare for sleep */
 106                 .pmsStepID = pmsPrepSleep,                                              /* Unique identifier to this step */
 107                 .pmsSetCmd = pmsParkIt,                                                 /* Force us to be parked */
 108                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
 109                 .pmsDown = pmsPrepSleep,                                                /* We always stay here */
 110                 .pmsNext = pmsPrepSleep                                                 /* We always stay here */
 111         },
 112         {
 113                 .pmsLimit = 0,                                                                  /* Time doesn't matter for a prepare for sleep */
 114                 .pmsStepID = pmsOverTemp,                                               /* Unique identifier to this step */
 115                 .pmsSetCmd = 0,                                                                 /* Dummy platform power level */
 116                 .sf.pmsSetFuncInd = 0,                                                  /* Dummy platform set function */
 117                 .pmsDown = pmsOverTemp,                                                 /* We always stay here */
 118                 .pmsNext = pmsOverTemp                                                  /* We always stay here */
 119         }
 120 };
 121
 122
 123
 124 /*
 125  *      This is where the CPU part of the stepper code lives.
 126  *
 127  *      It also contains the "hacked kext" experimental code.  This is/was used for
 128  *      experimentation and bringup.  It should neither live long nor prosper.
 129  *
 130  */
 131
 132 /*
 133  *      Set the processor frequency and stuff
 134  */
 135
 136 void pmsCPUSet(uint32_t sel) {
 137         int nvoltage, nfreq;
 138         uint32_t oldaack;
 139         struct per_proc_info *pp;
 140
 141         pp = getPerProc();                                                                      /* Get our per_proc */
 142
 143         if(!((sel ^ pp->pms.pmsCSetCmd) & pmsCPU)) return;      /* If there aren't any changes, bail now... */
 144
 145         nfreq = (sel & pmsCPU) >> 16;                                           /* Isolate the new frequency */
 146
 147         switch(pp->pf.pfPowerModes & pmType) {                          /* Figure out what type to do */
 148
 149                 case pmDFS:                                                                             /* This is a DFS machine */
 150                         ml_set_processor_speed_dfs(nfreq);                      /* Yes, set it */
 151                         break;
 152
 153                 case pmDualPLL:
 154                         ml_set_processor_speed_dpll(nfreq);                     /* THIS IS COMPLETELY UNTESTED!!! */
 155                         break;
 156
 157                 case pmPowerTune:                                                               /* This is a PowerTune machine */
 158                         ml_set_processor_speed_powertune(nfreq);        /* Diddle the deal */
 159                         break;
 160
 161                 default:                                                                                /* Not this time dolt!!! */
 162                         panic("pmsCPUSet: unsupported power manager type: %08X\n", pp->pf.pfPowerModes);
 163                         break;
 164
 165         }
 166
 167 }
 168
 169 /*
 170  *      This code configures the initial step tables.  It should be called after the timebase frequency is initialized.
 171  */
 172
 173 void pmsCPUConf(void) {
 174
 175         int i;
 176         kern_return_t ret;
 177         pmsSetFunc_t pmsDfltFunc[pmsSetFuncMax];                        /* List of functions for the external power control to use */
 178
 179         for(i = 0; i < pmsSetFuncMax; i++) pmsDfltFunc[i] = 0;  /* Clear this */
 180
 181
 182         ret = pmsBuild((pmsDef *)&pmsDefault, sizeof(pmsDefault), pmsDfltFunc, 0, (pmsQueryFunc_t)0);   /* Configure the default stepper */
 183
 184 pCCfinish:
 185         if(ret != KERN_SUCCESS) {                                                       /* Some screw up? */
 186                 panic("pmsCPUConf: initial stepper table build failed, ret = %08X\n", ret);     /* Squeal */
 187         }
 188
 189         pmsSetStep(pmsHigh, 1);                                                         /* Slew to high speed */
 190         pmsPark();                                                                                      /* Then park */
 191         return;
 192 }
 193
 194 /*
 195  * Machine-dependent initialization
 196  */
 197 void
 198 pmsCPUMachineInit(void)
 199 {
 200         return;
 201 }
 202
 203 /*
 204  *      This function should be called once for each processor to force the
 205  *      processor to the correct voltage and frequency.
 206  */
 207
 208 void pmsCPUInit(void) {
 209
 210         int cpu;
 211
 212         cpu = cpu_number();                                                                     /* Who are we? */
 213
 214         kprintf("************ Initializing stepper hardware, cpu %d ******************\n", cpu);        /* (BRINGUP) */
 215
 216         pmsSetStep(pmsHigh, 1);                                                         /* Slew to high speed */
 217         pmsPark();                                                                                      /* Then park */
 218
 219         kprintf("************ Stepper hardware initialized, cpu %d ******************\n", cpu); /* (BRINGUP) */
 220
 221         return;
 222 }
 223
 224 uint32_t pmsCPUQuery(void) {
 225
 226         uint32_t result;
 227         struct per_proc_info *pp;
 228         uint64_t scdata;
 229
 230         pp = getPerProc();                                                                      /* Get our per_proc */
 231
 232         switch(pp->pf.pfPowerModes & pmType) {                          /* Figure out what type to do */
 233
 234                 case pmDFS:                                                                             /* This is a DFS machine */
 235                         result = hid1get();                                                     /* Get HID1 */
 236                         result = (result >> 6) & 0x00030000;            /* Isolate the DFS bits */
 237                         break;
 238
 239                 case pmPowerTune:                                                               /* This is a PowerTune machine */
 240                         (void)ml_scom_read(PowerTuneStatusReg, &scdata);        /* Get the current power level */
 241                         result = (scdata >> (32 + 8)) & 0x00030000;     /* Shift the data to align with the set command */
 242                         break;
 243
 244                 default:                                                                                /* Query not supported for this kind */
 245                         result = 0;                                                                     /* Return highest if not supported */
 246                         break;
 247
 248         }
 249
 250         return result;
 251 }
 252
 253 /*
 254  *      These are not implemented for PPC.
 255  */
 256 void pmsCPUYellowFlag(void) {
 257 }
 258
 259 void pmsCPUGreenFlag(void) {
 260 }
 261
 262 uint32_t pmsCPUPackageQuery(void)
 263 {
 264         /* multi-core CPUs are not supported. */
 265         return(~(uint32_t)0);
 266 }
 267
 268 /*
 269  *      Broadcast a change to all processors including ourselves.
 270  *      This must transition before broadcasting because we may block and end up on a different processor.
 271  *
 272  *      This will block until all processors have transitioned, so
 273  *      obviously, this can block.
 274  *
 275  *      Called with interruptions disabled.
 276  *
 277  */
 278
 279 void pmsCPURun(uint32_t nstep) {
 280
 281         pmsRunLocal(nstep);                                                             /* If we aren't parking (we are already parked), transition ourselves */
 282         (void)cpu_broadcast(&pmsBroadcastWait, pmsCPURemote, nstep);    /* Tell everyone else to do it too */
 283
 284         return;
 285
 286 }
 287
 288 /*
 289  *      Receive a broadcast and react.
 290  *      This is called from the interprocessor signal handler.
 291  *      We wake up the initiator after we are finished.
 292  *
 293  */
 294
 295 static void pmsCPURemote(uint32_t nstep) {
 296
 297         pmsRunLocal(nstep);                                                             /* Go set the step */
 298         if(!hw_atomic_sub(&pmsBroadcastWait, 1)) {              /* Drop the wait count */
 299                 thread_wakeup((event_t)&pmsBroadcastWait);      /* If we were the last, wake up the signaller */
 300         }
 301         return;
 302 }
 303
 304 /*
 305  *      Control the Power Management Stepper.
 306  *      Called from user state by the superuser via a ppc system call.
 307  *      Interruptions disabled.
 308  *
 309  */
 310 int pmsCntrl(struct savearea *save) {
 311         save->save_r3 = pmsControl(save->save_r3, (user_addr_t)(uintptr_t)save->save_r4, save->save_r5);
 312         return 1;
 313 }
 314
 315
 316