| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpigen.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) |
| { |
| 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, 0, 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 %lu, reg %lu\n", i, j); |
| free(reg); |
| return; |
| } |
| |
| uint32_t *ptr = reg + i * lpm->num_req_regs + j; |
| *ptr = res.buf[0]; |
| } |
| } |
| |
| if (info) { |
| info->addr = (uint8_t *)reg; |
| info->buffer_size = register_count * sizeof(uint32_t); |
| } |
| } |
| |
| /* |
| * For now there is only one disabled non-existent device, because Windows |
| * expects at least one device and crashes without it with a bluescreen |
| * (`INTERNAL_POWER_ERROR`). Returning an empty package does not work. |
| */ |
| static void lpi_get_constraints(void *unused) |
| { |
| /* |
| * Return (Package() { |
| * Package() { "\NULL", 0, |
| * Package() { 0, |
| * Package() { 0xff, 0 }}}}) |
| */ |
| acpigen_emit_byte(RETURN_OP); |
| acpigen_write_package(1); |
| { |
| acpigen_write_package(3); |
| { |
| acpigen_emit_namestring("\\NULL"); |
| 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); |
| } |