sys/platform/pc32/acpica/acpi_cstate_machdep.c

   1 /*
   2  * Copyright (c) 2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Sepherosa Ziehau <sepherosa@gmail.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/kernel.h>
  37 #include <sys/systm.h>
  38 #include <sys/globaldata.h>
  39
  40 #include <machine/md_var.h>
  41 #include <machine/cpufunc.h>
  42 #include <machine/cpufreq.h>
  43 #include <machine/cputypes.h>
  44 #include <machine/specialreg.h>
  45
  46 #include "acpi.h"
  47 #include "acpi_cpu_cstate.h"
  48
  49 int
  50 acpi_cst_md_cx_setup(struct acpi_cst_cx *cx)
  51 {
  52         if (cpu_vendor_id != CPU_VENDOR_INTEL) {
  53                 /*
  54                  * No optimization for non-Intel CPUs so far.
  55                  *
  56                  * Hardware fixed resouce is not supported for
  57                  * C1+ state yet.
  58                  */
  59                 if (cx->type == ACPI_STATE_C1 &&
  60                     cx->gas.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE)
  61                         return 0;
  62                 if (cx->gas.SpaceId != ACPI_ADR_SPACE_SYSTEM_IO &&
  63                     cx->gas.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
  64                         kprintf("C%d: invalid SpaceId %d\n", cx->type,
  65                             cx->gas.SpaceId);
  66                         return EINVAL;
  67                 }
  68                 return 0;
  69         }
  70
  71         if (cx->type == ACPI_STATE_C1 &&
  72             cx->gas.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE) {
  73                 /* TODO: filter C1 I/O then halt */
  74                 return 0;
  75         }
  76
  77         /* TODO: We don't support fixed hardware yet */
  78         if (cx->gas.SpaceId != ACPI_ADR_SPACE_SYSTEM_IO &&
  79             cx->gas.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
  80                 if (cx->gas.SpaceId != ACPI_ADR_SPACE_FIXED_HARDWARE) {
  81                         kprintf("C%d: invalid SpaceId %d\n", cx->type,
  82                             cx->gas.SpaceId);
  83                 }
  84                 return EINVAL;
  85         }
  86
  87         if (cx->type >= ACPI_STATE_C3) {
  88                 if (CPUID_TO_FAMILY(cpu_id) > 0xf ||
  89                     (CPUID_TO_FAMILY(cpu_id) == 0x6 &&
  90                      CPUID_TO_MODEL(cpu_id) >= 0xf)) {
  91                         /*
  92                          * Pentium dual-core, Core 2 and beyond do not
  93                          * need any additional activities to enter C3(+).
  94                          */
  95                         cx->preamble = ACPI_CST_CX_PREAMBLE_NONE;
  96                 } else if ((acpi_cst_quirks & ACPI_CST_QUIRK_NO_BM) == 0) {
  97                         /*
  98                          * Intel CPUs support bus master operation for
  99                          * entering C3(+) even on MP system.
 100                          */
 101                         cx->preamble = ACPI_CST_CX_PREAMBLE_BM_ARB;
 102                 }
 103         }
 104         return 0;
 105 }