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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <acpi/acpigen.h>
#include <assert.h>
#include <console/console.h>
#include <intelblocks/acpi.h>
#include <intelblocks/pmc_ipc.h>
#include <stdlib.h>
#include <types.h>
#define LPI_S0_HELPER_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
#define PEP_S0IX_UUID "57a6512e-3979-4e9d-9708-ff13b2508972"
#define SYSTEM_POWER_MANAGEMENT_HID "INT33A1"
#define SYSTEM_POWER_MANAGEMENT_CID "PNP0D80"
#define EC_S0IX_HOOK "\\_SB.PCI0.LPCB.EC0.S0IX"
#define MAINBOARD_HOOK "\\_SB.MS0X"
#define ENABLE_PM_BITS_HOOK "\\_SB.PCI0.EGPM"
#define RESTORE_PM_BITS_HOOK "\\_SB.PCI0.RGPM"
#define LPI_STATES_ALL 0xff
#define MIN_DEVICE_STATE ACPI_DEVICE_SLEEP_D0
#define PEPD_SCOPE "\\_SB.PCI0"
struct reg_info {
uint8_t *addr;
size_t buffer_size;
};
static void read_pmc_lpm_requirements(const struct soc_pmc_lpm *lpm,
struct reg_info *info)
{
assert(info);
if (!CONFIG(SOC_INTEL_COMMON_BLOCK_ACPI_PEP_LPM_REQ) || !lpm) {
memset(info, 0, sizeof(*info));
return;
}
const size_t register_count = lpm->num_substates * lpm->num_req_regs;
uint32_t *reg = calloc(register_count, sizeof(uint32_t));
/* Read the various LPM state requirement registers from the PMC */
for (size_t i = 0; i < lpm->num_substates; i++) {
if (!(lpm->lpm_enable_mask & BIT(i)))
continue;
for (size_t j = 0; j < lpm->num_req_regs; j++) {
const uint32_t offset = lpm->lpm_ipc_offset +
i * lpm->req_reg_stride +
j * sizeof(uint32_t);
const uint32_t cmd_reg = pmc_make_ipc_cmd(PMC_IPC_CMD_RD_PMC_REG,
PMC_IPC_CMD_SUBCMD_RD_PMC_REG, 0);
struct pmc_ipc_buffer req = {.buf[0] = offset};
struct pmc_ipc_buffer res = {};
enum cb_err result = pmc_send_ipc_cmd(cmd_reg, &req, &res);
if (result != CB_SUCCESS) {
printk(BIOS_ERR, "Failed to retrieve LPM substate registers"
"from LPM, substate %zu, reg %zu\n", i, j);
}
uint32_t *ptr = reg + i * lpm->num_req_regs + j;
*ptr = res.buf[0];
}
}
info->addr = (uint8_t *)reg;
info->buffer_size = register_count * sizeof(uint32_t);
}
/*
* Windows expects a non-empty package for this subfunction, otherwise it
* results in a bluescreen (`INTERNAL_POWER_ERROR`); returning an empty package
* does not work. To workaround this, return a package describing a single
* device, one that is known to exist, i.e. ACPI_CPU_STRING. expects at least
* one device and crashes without it with a bluescreen.
*/
static void lpi_get_constraints(void *unused)
{
char path[16];
/*
* Return (Package() {
* Package() { "\_SB.CP00", 0,
* Package() { 0,
* Package() { 0xff, 0 }}}})
*/
acpigen_emit_byte(RETURN_OP);
acpigen_write_package(1);
{
acpigen_write_package(3);
{
snprintf(path, sizeof(path), CONFIG_ACPI_CPU_STRING, 0);
acpigen_emit_namestring(path);
acpigen_write_integer(0); /* device disabled */
acpigen_write_package(2);
{
acpigen_write_integer(0); /* revision */
acpigen_write_package(2);
{
acpigen_write_integer(LPI_STATES_ALL);
acpigen_write_integer(MIN_DEVICE_STATE);
}
acpigen_write_package_end();
}
acpigen_write_package_end();
}
acpigen_write_package_end();
}
acpigen_write_package_end();
}
static void lpi_s0ix_entry(void *unused)
{
/* Inform the EC */
acpigen_write_if_cond_ref_of(EC_S0IX_HOOK);
acpigen_emit_namestring(EC_S0IX_HOOK);
acpigen_write_integer(1);
acpigen_write_if_end();
/* Provide a board level S0ix hook */
acpigen_write_if_cond_ref_of(MAINBOARD_HOOK);
acpigen_emit_namestring(MAINBOARD_HOOK);
acpigen_write_integer(1);
acpigen_write_if_end();
/* Save the current PM bits then enable GPIO PM with
MISCCFG_GPIO_PM_CONFIG_BITS */
acpigen_write_if_cond_ref_of(ENABLE_PM_BITS_HOOK);
acpigen_emit_namestring(ENABLE_PM_BITS_HOOK);
acpigen_write_if_end();
}
static void lpi_s0ix_exit(void *unused)
{
/* Inform the EC */
acpigen_write_if_cond_ref_of(EC_S0IX_HOOK);
acpigen_emit_namestring(EC_S0IX_HOOK);
acpigen_write_integer(0);
acpigen_write_if_end();
/* Provide a board level S0ix hook */
acpigen_write_if_cond_ref_of(MAINBOARD_HOOK);
acpigen_emit_namestring(MAINBOARD_HOOK);
acpigen_write_integer(0);
acpigen_write_if_end();
/* Restore GPIO all Community PM */
acpigen_write_if_cond_ref_of(RESTORE_PM_BITS_HOOK);
acpigen_emit_namestring(RESTORE_PM_BITS_HOOK);
acpigen_write_if_end();
}
static void (*lpi_s0_helpers[])(void *) = {
NULL, /* enumerate functions (autogenerated) */
lpi_get_constraints, /* get device constraints */
NULL, /* get crash dump device */
NULL, /* display off notify */
NULL, /* display on notify */
lpi_s0ix_entry, /* s0ix entry */
lpi_s0ix_exit, /* s0ix exit */
};
static void pep_s0ix_return_lpm_requirements(void *arg)
{
if (!CONFIG(SOC_INTEL_COMMON_BLOCK_ACPI_PEP_LPM_REQ)) {
acpigen_write_return_singleton_buffer(0x0);
return;
}
struct reg_info *info = (struct reg_info *)arg;
acpigen_write_return_byte_buffer(info->addr, info->buffer_size);
}
static void (*pep_s0ix[])(void *) = {
NULL, /* enumerate functions (autogenerated) */
pep_s0ix_return_lpm_requirements, /* Return LPM requirements */
};
void generate_acpi_power_engine_with_lpm(const struct soc_pmc_lpm *lpm)
{
struct reg_info info;
size_t uuid_count = 1;
struct dsm_uuid ids[] = {
DSM_UUID(LPI_S0_HELPER_UUID, lpi_s0_helpers, ARRAY_SIZE(lpi_s0_helpers), NULL),
DSM_UUID(PEP_S0IX_UUID, pep_s0ix, ARRAY_SIZE(pep_s0ix), &info),
};
acpigen_write_scope(PEPD_SCOPE);
acpigen_write_device("PEPD");
acpigen_write_name_string("_HID", SYSTEM_POWER_MANAGEMENT_HID);
acpigen_write_name("_CID");
acpigen_emit_eisaid(SYSTEM_POWER_MANAGEMENT_CID);
read_pmc_lpm_requirements(lpm, &info);
if (info.buffer_size)
uuid_count++;
acpigen_write_dsm_uuid_arr(ids, uuid_count);
acpigen_write_device_end();
acpigen_write_scope_end();
free(info.addr);
printk(BIOS_INFO, PEPD_SCOPE ".PEPD: Intel Power Engine Plug-in\n");
}
void generate_acpi_power_engine(void)
{
generate_acpi_power_engine_with_lpm(NULL);
}
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