| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpi.h> |
| #include <acpi/acpigen.h> |
| #include <assert.h> |
| #include <commonlib/bsd/helpers.h> |
| #include <console/console.h> |
| #include <intelblocks/acpi.h> |
| #include <intelblocks/pmc_ipc.h> |
| #include <stdlib.h> |
| #include <string.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 EC_DISPLAY_HOOK "\\_SB.PCI0.LPCB.EC0.EDSX" |
| #define MAINBOARD_HOOK "\\_SB.MS0X" |
| #define MAINBOARD_DISPLAY_HOOK "\\_SB.MDSX" |
| #define ENABLE_PM_BITS_HOOK "\\_SB.PCI0.EGPM" |
| #define RESTORE_PM_BITS_HOOK "\\_SB.PCI0.RGPM" |
| #define THUNDERBOLT_DEVICE "\\_SB.PCI0.TXHC" |
| #define THUNDERBOLT_IOM_DPOF "\\_SB.PCI0.DPOF" |
| #define PEPD_SCOPE "\\_SB.PCI0" |
| |
| #define MIN_DEVICE_STATE ACPI_DEVICE_SLEEP_D0 |
| #define LPI_STATES_ALL 0xff |
| |
| enum { |
| LPI_REVISION_0 = 0, |
| }; |
| |
| enum { |
| LPI_DISABLED = 0, |
| LPI_ENABLED = 1, |
| }; |
| |
| 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 acpi_gen_default_lpi_constraints(void) |
| { |
| char path[16]; |
| printk(BIOS_INFO, "Returning default LPI constraint package\n"); |
| |
| /* |
| * 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(); |
| } |
| |
| __weak struct min_sleep_state *soc_get_min_sleep_state_array(size_t *size) |
| { |
| printk(BIOS_DEBUG, "Empty min sleep state array returned\n"); |
| *size = 0; |
| return NULL; |
| } |
| |
| static enum acpi_device_sleep_states get_min_sleep_state( |
| const struct device *dev, struct min_sleep_state *states_arr, size_t size) |
| { |
| if (!is_dev_enabled(dev)) |
| return ACPI_DEVICE_SLEEP_NONE; |
| switch (dev->path.type) { |
| case DEVICE_PATH_APIC: |
| return MIN_DEVICE_STATE; |
| |
| case DEVICE_PATH_PCI: |
| /* skip external buses*/ |
| if ((dev->bus->secondary != 0) || (!states_arr)) |
| return ACPI_DEVICE_SLEEP_NONE; |
| for (size_t i = 0; i < size; i++) |
| if (states_arr[i].pci_dev == dev->path.pci.devfn) |
| return states_arr[i].min_sleep_state; |
| printk(BIOS_WARNING, "Unknown min d_state for %x\n", dev->path.pci.devfn); |
| return ACPI_DEVICE_SLEEP_NONE; |
| |
| default: |
| return ACPI_DEVICE_SLEEP_NONE; |
| } |
| } |
| |
| /* Generate the LPI constraint table */ |
| static void acpi_lpi_get_constraints(void *unused) |
| { |
| unsigned int num_entries = 0; |
| const struct device *dev; |
| enum acpi_device_sleep_states min_sleep_state; |
| size_t size; |
| struct min_sleep_state *states_arr = soc_get_min_sleep_state_array(&size); |
| |
| if (size && states_arr) { |
| for (dev = all_devices; dev; dev = dev->next) { |
| if (get_min_sleep_state(dev, states_arr, size) |
| != ACPI_DEVICE_SLEEP_NONE) |
| num_entries++; |
| } |
| } |
| if (!num_entries) { |
| acpi_gen_default_lpi_constraints(); |
| } else { |
| acpigen_emit_byte(RETURN_OP); |
| acpigen_write_package(num_entries); |
| |
| size_t cpu_index = 0; |
| for (dev = all_devices; dev; dev = dev->next) { |
| min_sleep_state = get_min_sleep_state(dev, states_arr, size); |
| if (min_sleep_state == ACPI_DEVICE_SLEEP_NONE) |
| continue; |
| |
| acpigen_write_package(3); |
| { |
| char path[32] = { 0 }; |
| /* Emit the device path */ |
| switch (dev->path.type) { |
| case DEVICE_PATH_PCI: |
| acpigen_emit_namestring(acpi_device_path(dev)); |
| break; |
| |
| case DEVICE_PATH_APIC: |
| snprintf(path, sizeof(path), CONFIG_ACPI_CPU_STRING, |
| cpu_index++); |
| acpigen_emit_namestring(path); |
| break; |
| |
| default: |
| /* Unhandled */ |
| printk(BIOS_WARNING, |
| "Unhandled device path type %d\n", |
| dev->path.type); |
| acpigen_emit_namestring(NULL); |
| break; |
| } |
| |
| acpigen_write_integer(LPI_ENABLED); |
| acpigen_write_package(2); |
| { |
| acpigen_write_integer(LPI_REVISION_0); |
| acpigen_write_package(2); /* no optional device info */ |
| { |
| /* Assume constraints apply to all entries */ |
| acpigen_write_integer(LPI_STATES_ALL); |
| /* min D-state */ |
| acpigen_write_integer(min_sleep_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(); |
| |
| /* Handle Thunderbolt displays */ |
| acpigen_write_if_cond_ref_of(THUNDERBOLT_DEVICE); |
| acpigen_write_store_int_to_namestr(1, THUNDERBOLT_IOM_DPOF); |
| 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(); |
| |
| /* Handle Thunderbolt displays */ |
| acpigen_write_if_cond_ref_of(THUNDERBOLT_DEVICE); |
| acpigen_write_store_int_to_namestr(0, THUNDERBOLT_IOM_DPOF); |
| acpigen_write_if_end(); |
| } |
| |
| static void lpi_display_on(void *unused) |
| { |
| /* Inform the EC */ |
| acpigen_write_if_cond_ref_of(EC_DISPLAY_HOOK); |
| acpigen_emit_namestring(EC_DISPLAY_HOOK); |
| acpigen_write_integer(1); |
| acpigen_write_if_end(); |
| |
| /* Provide a board level S0ix hook */ |
| acpigen_write_if_cond_ref_of(MAINBOARD_DISPLAY_HOOK); |
| acpigen_emit_namestring(MAINBOARD_DISPLAY_HOOK); |
| acpigen_write_integer(1); |
| acpigen_write_if_end(); |
| } |
| |
| static void lpi_display_off(void *unused) |
| { |
| /* Inform the EC */ |
| acpigen_write_if_cond_ref_of(EC_DISPLAY_HOOK); |
| acpigen_emit_namestring(EC_DISPLAY_HOOK); |
| acpigen_write_integer(0); |
| acpigen_write_if_end(); |
| |
| /* Provide a board level S0ix hook */ |
| acpigen_write_if_cond_ref_of(MAINBOARD_DISPLAY_HOOK); |
| acpigen_emit_namestring(MAINBOARD_DISPLAY_HOOK); |
| acpigen_write_integer(0); |
| acpigen_write_if_end(); |
| } |
| |
| static void (*lpi_s0_helpers[])(void *) = { |
| NULL, /* enumerate functions (autogenerated) */ |
| acpi_lpi_get_constraints,/* get device constraints */ |
| NULL, /* get crash dump device */ |
| lpi_display_off, /* display off notify */ |
| lpi_display_on, /* 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); |
| } |