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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <types.h>
#include <console/console.h>
#include <acpi/acpi.h>
#include <acpi/acpigen.h>
#include <arch/cpu.h>
#include <cpu/x86/msr.h>
#include <cpu/intel/fsb.h>
#include <cpu/intel/speedstep.h>
#include <device/device.h>
static int determine_total_number_of_cores(void)
{
struct device *cpu;
int count = 0;
for (cpu = all_devices; cpu; cpu = cpu->next) {
if ((cpu->path.type != DEVICE_PATH_APIC) ||
(cpu->bus->dev->path.type != DEVICE_PATH_CPU_CLUSTER)) {
continue;
}
if (!cpu->enabled)
continue;
count++;
}
return count;
}
static void gen_pstate_entries(const sst_table_t *const pstates,
const int cpuID, const int cores_per_package,
const uint8_t coordination)
{
int i;
int frequency;
acpigen_write_empty_PCT();
acpigen_write_PSD_package(
cpuID, cores_per_package, coordination);
acpigen_write_name("_PSS");
int fsb3 = get_ia32_fsb_x3();
if (fsb3 <= 0) {
printk(BIOS_ERR, "CPU or FSB not supported. Assuming 200MHz\n");
fsb3 = 600;
}
const int min_ratio2 = SPEEDSTEP_DOUBLE_RATIO(
pstates->states[pstates->num_states - 1]);
const int max_ratio2 = SPEEDSTEP_DOUBLE_RATIO(pstates->states[0]);
printk(BIOS_DEBUG, "clocks between %d and %d MHz.\n",
(min_ratio2 * fsb3)
/ (pstates->states[pstates->num_states - 1].is_slfm ? 12 : 6),
(max_ratio2 * fsb3) / 6);
printk(BIOS_DEBUG,
"adding %x P-States between busratio %x and %x, incl. P0\n",
pstates->num_states, min_ratio2 / 2, max_ratio2 / 2);
acpigen_write_package(pstates->num_states);
for (i = 0; i < pstates->num_states; ++i) {
const sst_state_t *const pstate = &pstates->states[i];
/* Report frequency of turbo mode as that of HFM + 1. */
if (pstate->is_turbo)
frequency = (SPEEDSTEP_DOUBLE_RATIO(
pstates->states[i + 1]) * fsb3) / 6 + 1;
/* Super-LFM runs at half frequency. */
else if (pstate->is_slfm)
frequency = (SPEEDSTEP_DOUBLE_RATIO(*pstate)*fsb3)/12;
else
frequency = (SPEEDSTEP_DOUBLE_RATIO(*pstate)*fsb3)/6;
acpigen_write_PSS_package(
frequency, pstate->power, 0, 0,
SPEEDSTEP_ENCODE_STATE(*pstate),
SPEEDSTEP_ENCODE_STATE(*pstate));
}
acpigen_pop_len();
acpigen_write_PPC(0);
}
/**
* @brief Generate ACPI entries for Speedstep for each cpu
*/
void generate_cpu_entries(const struct device *device)
{
int coreID, cpuID, pcontrol_blk = PMB0_BASE, plen = 6;
int totalcores = determine_total_number_of_cores();
int cores_per_package = (cpuid_ebx(1)>>16) & 0xff;
int numcpus = totalcores/cores_per_package; /* This assumes that all
CPUs share the same
layout. */
int num_cstates;
acpi_cstate_t *cstates;
sst_table_t pstates;
uint8_t coordination;
printk(BIOS_DEBUG, "Found %d CPU(s) with %d core(s) each.\n",
numcpus, cores_per_package);
num_cstates = get_cst_entries(&cstates);
speedstep_gen_pstates(&pstates);
if (((cpuid_eax(1) >> 4) & 0xffff) == 0x1067)
/* For Penryn use HW_ALL. */
coordination = HW_ALL;
else
/* Use SW_ANY as that was the default. */
coordination = SW_ANY;
for (cpuID = 0; cpuID < numcpus; ++cpuID) {
for (coreID = 1; coreID <= cores_per_package; coreID++) {
if (coreID > 1) {
pcontrol_blk = 0;
plen = 0;
}
/* Generate processor \_SB.CPUx. */
acpigen_write_processor(
cpuID * cores_per_package + coreID - 1,
pcontrol_blk, plen);
/* Generate p-state entries. */
gen_pstate_entries(&pstates, cpuID,
cores_per_package, coordination);
/* Generate c-state entries. */
if (num_cstates > 0)
acpigen_write_CST_package(
cstates, num_cstates);
acpigen_pop_len();
}
}
/* PPKG is usually used for thermal management
of the first and only package. */
acpigen_write_processor_package("PPKG", 0, cores_per_package);
acpigen_write_processor_cnot(cores_per_package);
}
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