diff options
Diffstat (limited to 'src/soc/intel/common/block/smm/smihandler.c')
| -rw-r--r-- | src/soc/intel/common/block/smm/smihandler.c | 501 |
1 files changed, 501 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/smm/smihandler.c b/src/soc/intel/common/block/smm/smihandler.c new file mode 100644 index 0000000000..b620ff9f1e --- /dev/null +++ b/src/soc/intel/common/block/smm/smihandler.c @@ -0,0 +1,501 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * Copyright (C) 2015-2016 Intel Corp. + * + * 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 <arch/hlt.h> +#include <arch/io.h> +#include <console/console.h> +#include <cpu/x86/cache.h> +#include <cpu/x86/smm.h> +#include <device/pci_def.h> +#include <elog.h> +#include <intelblocks/smihandler.h> +#include <soc/nvs.h> +#include <soc/pm.h> +#include <soc/gpio.h> +#include <soc/iomap.h> +#include <spi-generic.h> +#include <stdint.h> +#include <stdlib.h> + +/* GNVS needs to be set by coreboot initiating a software SMI. */ +static struct global_nvs_t *gnvs; + +__attribute__((weak)) int smihandler_disable_busmaster(device_t dev) +{ + return 1; +} + +static void *find_save_state(const struct smm_save_state_ops *save_state_ops, + int cmd) +{ + int node; + void *state = NULL; + uint32_t io_misc_info; + uint8_t reg_al; + + /* Check all nodes looking for the one that issued the IO */ + for (node = 0; node < CONFIG_MAX_CPUS; node++) { + state = smm_get_save_state(node); + + io_misc_info = save_state_ops->get_io_misc_info(state); + + /* Check for Synchronous IO (bit0==1) */ + if (!(io_misc_info & (1 << 0))) + continue; + /* Make sure it was a write (bit4==0) */ + if (io_misc_info & (1 << 4)) + continue; + /* Check for APMC IO port */ + if (((io_misc_info >> 16) & 0xff) != APM_CNT) + continue; + /* Check AL against the requested command */ + reg_al = save_state_ops->get_reg(state, RAX); + if (reg_al != cmd) + continue; + break; + } + return state; +} + +/* Inherited from cpu/x86/smm.h resulting in a different signature */ +void southbridge_smi_set_eos(void) +{ + enable_smi(EOS); +} + +struct global_nvs_t *smm_get_gnvs(void) +{ + return gnvs; +} + +static void busmaster_disable_on_bus(int bus) +{ + int slot, func; + unsigned int val; + unsigned char hdr; + + for (slot = 0; slot < 0x20; slot++) { + for (func = 0; func < 8; func++) { + u32 reg32; + device_t dev = PCI_DEV(bus, slot, func); + + if (!smihandler_disable_busmaster(dev)) + continue; + val = pci_read_config32(dev, PCI_VENDOR_ID); + + if (val == 0xffffffff || val == 0x00000000 || + val == 0x0000ffff || val == 0xffff0000) + continue; + + /* Disable Bus Mastering for this one device */ + reg32 = pci_read_config32(dev, PCI_COMMAND); + reg32 &= ~PCI_COMMAND_MASTER; + pci_write_config32(dev, PCI_COMMAND, reg32); + + /* If it's not a bridge, move on. */ + hdr = pci_read_config8(dev, PCI_HEADER_TYPE); + hdr &= 0x7f; + if (hdr != PCI_HEADER_TYPE_BRIDGE && + hdr != PCI_HEADER_TYPE_CARDBUS) + continue; + + /* + * If secondary bus is equal to current bus bypass + * the bridge because it's likely unconfigured and + * would cause infinite recursion. + */ + int secbus = pci_read_config8(dev, PCI_SECONDARY_BUS); + + if (secbus == bus) + continue; + + busmaster_disable_on_bus(secbus); + } + } +} + + +void smihandler_southbridge_sleep( + const struct smm_save_state_ops *save_state_ops) +{ + uint32_t reg32; + uint8_t slp_typ; + + /* First, disable further SMIs */ + disable_smi(SLP_SMI_EN); + /* Figure out SLP_TYP */ + reg32 = inl(ACPI_BASE_ADDRESS + PM1_CNT); + printk(BIOS_SPEW, "SMI#: SLP = 0x%08x\n", reg32); + slp_typ = acpi_sleep_from_pm1(reg32); + + /* Do any mainboard sleep handling */ + mainboard_smi_sleep(slp_typ); + + /* Log S3, S4, and S5 entry */ + if (slp_typ >= ACPI_S3 && IS_ENABLED(CONFIG_ELOG_GSMI)) + elog_add_event_byte(ELOG_TYPE_ACPI_ENTER, slp_typ); + + /* Clear pending GPE events */ + clear_gpe_status(); + + /* Next, do the deed. */ + + switch (slp_typ) { + case ACPI_S0: + printk(BIOS_DEBUG, "SMI#: Entering S0 (On)\n"); + break; + case ACPI_S3: + printk(BIOS_DEBUG, "SMI#: Entering S3 (Suspend-To-RAM)\n"); + + /* Invalidate the cache before going to S3 */ + wbinvd(); + break; + case ACPI_S4: + printk(BIOS_DEBUG, "SMI#: Entering S4 (Suspend-To-Disk)\n"); + break; + case ACPI_S5: + printk(BIOS_DEBUG, "SMI#: Entering S5 (Soft Power off)\n"); + + /* Disable all GPE */ + disable_all_gpe(); + /* also iterates over all bridges on bus 0 */ + busmaster_disable_on_bus(0); + break; + default: + printk(BIOS_DEBUG, "SMI#: ERROR: SLP_TYP reserved\n"); + break; + } + + /* Clear the gpio gpe0 status bits in ACPI registers */ + clear_gpi_gpe_sts(); + + /* Tri-state specific GPIOS to avoid leakage during S3/S5 */ + + /* + * Write back to the SLP register to cause the originally intended + * event again. We need to set BIT13 (SLP_EN) though to make the + * sleep happen. + */ + enable_pm1_control(SLP_EN); + + /* Make sure to stop executing code here for S3/S4/S5 */ + if (slp_typ >= ACPI_S3) + hlt(); + + /* + * In most sleep states, the code flow of this function ends at + * the line above. However, if we entered sleep state S1 and wake + * up again, we will continue to execute code in this function. + */ + reg32 = inl(ACPI_BASE_ADDRESS + PM1_CNT); + if (reg32 & SCI_EN) { + /* The OS is not an ACPI OS, so we set the state to S0 */ + disable_pm1_control(SLP_EN | SLP_TYP); + } +} + +static void southbridge_smi_gsmi( + const struct smm_save_state_ops *save_state_ops) +{ + u8 sub_command, ret; + void *io_smi = NULL; + uint32_t reg_ebx; + + io_smi = find_save_state(save_state_ops, ELOG_GSMI_APM_CNT); + if (!io_smi) + return; + /* Command and return value in EAX */ + sub_command = (save_state_ops->get_reg(io_smi, RAX) >> 8) + & 0xff; + + /* Parameter buffer in EBX */ + reg_ebx = save_state_ops->get_reg(io_smi, RBX); + + /* drivers/elog/gsmi.c */ + ret = gsmi_exec(sub_command, ®_ebx); + save_state_ops->set_reg(io_smi, RAX, ret); +} + +static void finalize(void) +{ + static int finalize_done; + + if (finalize_done) { + printk(BIOS_DEBUG, "SMM already finalized.\n"); + return; + } + finalize_done = 1; + +} + +void smihandler_southbridge_apmc( + const struct smm_save_state_ops *save_state_ops) +{ + uint8_t reg8; + void *state = NULL; + static int smm_initialized = 0; + + /* Emulate B2 register as the FADT / Linux expects it */ + + reg8 = inb(APM_CNT); + switch (reg8) { + case APM_CNT_CST_CONTROL: + /* + * Calling this function seems to cause + * some kind of race condition in Linux + * and causes a kernel oops + */ + printk(BIOS_DEBUG, "C-state control\n"); + break; + case APM_CNT_PST_CONTROL: + /* + * Calling this function seems to cause + * some kind of race condition in Linux + * and causes a kernel oops + */ + printk(BIOS_DEBUG, "P-state control\n"); + break; + case APM_CNT_ACPI_DISABLE: + disable_pm1_control(SCI_EN); + printk(BIOS_DEBUG, "SMI#: ACPI disabled.\n"); + break; + case APM_CNT_ACPI_ENABLE: + enable_pm1_control(SCI_EN); + printk(BIOS_DEBUG, "SMI#: ACPI enabled.\n"); + break; + case APM_CNT_GNVS_UPDATE: + if (smm_initialized) { + printk(BIOS_DEBUG, + "SMI#: SMM structures already initialized!\n"); + return; + } + state = find_save_state(save_state_ops, reg8); + if (state) { + /* EBX in the state save contains the GNVS pointer */ + uint32_t reg_ebx = save_state_ops->get_reg(state, RBX); + gnvs = (struct global_nvs_t *)(uintptr_t)reg_ebx; + smm_initialized = 1; + printk(BIOS_DEBUG, "SMI#: Setting GNVS to %p\n", gnvs); + } + break; + case ELOG_GSMI_APM_CNT: + if (IS_ENABLED(CONFIG_ELOG_GSMI)) + southbridge_smi_gsmi(save_state_ops); + break; + case APM_CNT_FINALIZE: + finalize(); + break; + } + + mainboard_smi_apmc(reg8); +} + +void smihandler_southbridge_pm1( + const struct smm_save_state_ops *save_state_ops) +{ + uint16_t pm1_sts = clear_pm1_status(); + + /* + * While OSPM is not active, poweroff immediately + * on a power button event. + */ + if (pm1_sts & PWRBTN_STS) { + /* power button pressed */ + if (IS_ENABLED(CONFIG_ELOG_GSMI)) + elog_add_event(ELOG_TYPE_POWER_BUTTON); + disable_pm1_control(-1UL); + enable_pm1_control(SLP_EN | (SLP_TYP_S5 << SLP_TYP_SHIFT)); + } +} + +void smihandler_southbridge_gpe0( + const struct smm_save_state_ops *save_state_ops) +{ + clear_gpe_status(); +} + +void smihandler_southbridge_tco( + const struct smm_save_state_ops *save_state_ops) +{ + uint32_t tco_sts = clear_tco_status(); + + /* Any TCO event? */ + if (!tco_sts) + return; + + if (tco_sts & TCO_TIMEOUT) { /* TIMEOUT */ + /* Handle TCO timeout */ + printk(BIOS_DEBUG, "TCO Timeout.\n"); + } +} + +void smihandler_southbridge_periodic( + const struct smm_save_state_ops *save_state_ops) +{ + uint32_t reg32; + + reg32 = get_smi_en(); + + /* Are periodic SMIs enabled? */ + if ((reg32 & PERIODIC_EN) == 0) + return; + printk(BIOS_DEBUG, "Periodic SMI.\n"); +} + +void southbridge_smi_handler(void) +{ + int i; + uint32_t smi_sts; + const struct smm_save_state_ops *save_state_ops; + + /* + * We need to clear the SMI status registers, or we won't see what's + * happening in the following calls. + */ + smi_sts = clear_smi_status(); + + save_state_ops = get_smm_save_state_ops(); + + /* Call SMI sub handler for each of the status bits */ + for (i = 0; i < ARRAY_SIZE(southbridge_smi); i++) { + if (!(smi_sts & (1 << i))) + continue; + + if (southbridge_smi[i] != NULL) { + southbridge_smi[i](save_state_ops); + } else { + printk(BIOS_DEBUG, + "SMI_STS[%d] occurred, but no " + "handler available.\n", i); + } + } +} + +static uint32_t em64t100_smm_save_state_get_io_misc_info(void *state) +{ + em64t100_smm_state_save_area_t *smm_state = state; + return smm_state->io_misc_info; +} + +static uint64_t em64t100_smm_save_state_get_reg(void *state, enum smm_reg reg) +{ + uintptr_t value = 0; + em64t100_smm_state_save_area_t *smm_state = state; + + switch (reg) { + case RAX: + value = smm_state->rax; + break; + case RBX: + value = smm_state->rbx; + break; + case RCX: + value = smm_state->rcx; + break; + case RDX: + value = smm_state->rdx; + break; + default: + break; + } + return value; +} + +static void em64t100_smm_save_state_set_reg(void *state, enum smm_reg reg, + uint64_t val) +{ + em64t100_smm_state_save_area_t *smm_state = state; + switch (reg) { + case RAX: + smm_state->rax = val; + break; + case RBX: + smm_state->rbx = val; + break; + case RCX: + smm_state->rcx = val; + break; + case RDX: + smm_state->rdx = val; + break; + default: + break; + } +} + +static uint32_t em64t101_smm_save_state_get_io_misc_info(void *state) +{ + em64t101_smm_state_save_area_t *smm_state = state; + return smm_state->io_misc_info; +} + +static uint64_t em64t101_smm_save_state_get_reg(void *state, enum smm_reg reg) +{ + uintptr_t value = 0; + em64t101_smm_state_save_area_t *smm_state = state; + + switch (reg) { + case RAX: + value = smm_state->rax; + break; + case RBX: + value = smm_state->rbx; + break; + case RCX: + value = smm_state->rcx; + break; + case RDX: + value = smm_state->rdx; + break; + default: + break; + } + return value; +} + +static void em64t101_smm_save_state_set_reg(void *state, enum smm_reg reg, + uint64_t val) +{ + em64t101_smm_state_save_area_t *smm_state = state; + switch (reg) { + case RAX: + smm_state->rax = val; + break; + case RBX: + smm_state->rbx = val; + break; + case RCX: + smm_state->rcx = val; + break; + case RDX: + smm_state->rdx = val; + break; + default: + break; + } +} + +const struct smm_save_state_ops em64t100_smm_ops = { + .get_io_misc_info = em64t100_smm_save_state_get_io_misc_info, + .get_reg = em64t100_smm_save_state_get_reg, + .set_reg = em64t100_smm_save_state_set_reg, +}; + +const struct smm_save_state_ops em64t101_smm_ops = { + .get_io_misc_info = em64t101_smm_save_state_get_io_misc_info, + .get_reg = em64t101_smm_save_state_get_reg, + .set_reg = em64t101_smm_save_state_set_reg, +}; |