src/soc/intel/common/block/acpi/lpit.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <acpi/acpi.h>
   4 #include <cpu/intel/msr.h>
   5 #include <soc/iomap.h>
   6 #include <soc/pmc.h>
   7 #include <stdint.h>
   8
   9 unsigned long acpi_fill_lpit(unsigned long current)
  10 {
  11         uint16_t uid = 0;
  12         acpi_lpi_desc_ncst_t *pkg_counter;
  13         acpi_lpi_desc_ncst_t *sys_counter;
  14
  15         /*
  16          * Package C10 (PC10) residency counter
  17          */
  18         pkg_counter = (void *)current;
  19         current += acpi_create_lpi_desc_ncst((void *)current, uid++);
  20
  21         /* MWAIT LPI state entry trigger */
  22         pkg_counter->entry_trigger.addrl                = 0x60; /* MWAIT(6,0) / HW C10 */
  23         pkg_counter->entry_trigger.bit_offset           = ACPI_FFIXEDHW_CLASS_MWAIT;
  24         pkg_counter->entry_trigger.bit_width            = ACPI_FFIXEDHW_VENDOR_INTEL;
  25         pkg_counter->entry_trigger.space_id             = ACPI_ADDRESS_SPACE_FIXED;
  26         pkg_counter->entry_trigger.access_size          = ACPI_ACCESS_SIZE_UNDEFINED;
  27
  28         /* PC10 residency counter */
  29         pkg_counter->residency_counter.addrl            = MSR_PKG_C10_RESIDENCY;
  30         pkg_counter->residency_counter.bit_offset       =  0;
  31         pkg_counter->residency_counter.bit_width        = 64;
  32         pkg_counter->residency_counter.space_id         = ACPI_ADDRESS_SPACE_FIXED;
  33         pkg_counter->residency_counter.access_size      = ACPI_ACCESS_SIZE_UNDEFINED;
  34         pkg_counter->counter_frequency                  = ACPI_LPIT_CTR_FREQ_TSC;
  35
  36         /* Min. residency and worst-case latency (from FSP and vendor dumps) */
  37         pkg_counter->min_residency                      = 30000; /* break-even: 30 ms */
  38         pkg_counter->max_latency                        =  3000; /* worst-case latency: 3 ms */
  39
  40         /*
  41          * System (Slp_S0) residency counter
  42          */
  43         sys_counter = (void *)current;
  44         current += acpi_create_lpi_desc_ncst((void *)current, uid++);
  45
  46         /* MWAIT LPI state entry trigger */
  47         sys_counter->entry_trigger.addrl                = 0x60; /* MWAIT(6,0) / HW C10 */
  48         sys_counter->entry_trigger.bit_offset           = ACPI_FFIXEDHW_CLASS_MWAIT;
  49         sys_counter->entry_trigger.bit_width            = ACPI_FFIXEDHW_VENDOR_INTEL;
  50         sys_counter->entry_trigger.space_id             = ACPI_ADDRESS_SPACE_FIXED;
  51         sys_counter->entry_trigger.access_size          = ACPI_ACCESS_SIZE_UNDEFINED;
  52
  53         /* slp_s0 residency counter */
  54         sys_counter->residency_counter.addrl            = PCH_PWRM_BASE_ADDRESS + SLP_S0_RES;
  55         sys_counter->residency_counter.bit_offset       =  0;
  56         sys_counter->residency_counter.bit_width        = 32;
  57         sys_counter->residency_counter.space_id         = ACPI_ADDRESS_SPACE_MEMORY;
  58         sys_counter->residency_counter.access_size      = ACPI_ACCESS_SIZE_DWORD_ACCESS;
  59         sys_counter->counter_frequency                  =
  60                 CONFIG_SOC_INTEL_COMMON_BLOCK_ACPI_SLP_S0_FREQ_HZ;
  61
  62         /* Min. residency and worst-case latency (from FSP and vendor dumps) */
  63         sys_counter->min_residency                      = 30000; /* break-even: 30 ms */
  64         sys_counter->max_latency                        =  3000; /* worst-case latency: 3 ms */
  65
  66         return current;
  67 }