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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
* 2012 secunet Security Networks AG
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <types.h>
#include <console/console.h>
#include <arch/acpi.h>
#include <arch/acpigen.h>
#include <arch/cpu.h>
#include <cpu/x86/msr.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;
}
/**
* @brief Returns three times the FSB clock in MHz
*
* The result of calculations with the returned value shall be divided by 3.
* This helps to avoid rounding errors.
*/
static int get_fsb(void)
{
const u32 fsbcode = rdmsr(MSR_FSB_FREQ).lo & 7;
switch (fsbcode) {
case 0: return 800; /* / 3 == 266 */
case 1: return 400; /* / 3 == 133 */
case 2: return 600; /* / 3 == 200 */
case 3: return 500; /* / 3 == 166 */
case 4: return 1000; /* / 3 == 333 */
case 5: return 300; /* / 3 == 100 */
case 6: return 1200; /* / 3 == 400 */
}
printk(BIOS_WARNING,
"Warning: No supported FSB frequency. Assuming 200MHz\n");
return 600;
}
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");
const int fsb3 = get_fsb();
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(device_t 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 \_PR.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();
}
}
}
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