/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* GNVS needs to be set by coreboot initiating a software SMI. */ static global_nvs_t *gnvs; static int smm_initialized; int southbridge_io_trap_handler(int smif) { switch (smif) { case 0x32: printk(BIOS_DEBUG, "OS Init\n"); /* * gnvs->smif: * On success, the IO Trap Handler returns 0 * On failure, the IO Trap Handler returns a value != 0 */ gnvs->smif = 0; return 1; /* IO trap handled */ } /* Not handled */ return 0; } void southbridge_smi_set_eos(void) { enable_smi(EOS); } 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++) { u16 reg16; pci_devfn_t dev = PCI_DEV(bus, slot, func); 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 */ reg16 = pci_read_config16(dev, PCI_COMMAND); reg16 &= ~PCI_COMMAND_MASTER; pci_write_config16(dev, PCI_COMMAND, reg16); /* If this is a bridge, then follow it. */ hdr = pci_read_config8(dev, PCI_HEADER_TYPE); hdr &= 0x7f; if (hdr == PCI_HEADER_TYPE_BRIDGE || hdr == PCI_HEADER_TYPE_CARDBUS) { unsigned int buses; buses = pci_read_config32(dev, PCI_PRIMARY_BUS); busmaster_disable_on_bus((buses >> 8) & 0xff); } } } } static void tristate_gpios(uint32_t val) { /* Tri-state eMMC */ write32((void *)COMMUNITY_GPSOUTHEAST_BASE + SDMMC1_CMD_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + SDMMC1_D0_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + SDMMC1_D1_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + SDMMC1_D2_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + SDMMC1_D3_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + MMC1_D4_SD_WE_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + MMC1_D5_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + MMC1_D6_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + MMC1_D7_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHEAST_BASE + MMC1_RCLK_OFFSET, val); /* Tri-state HDMI */ write32((void *)COMMUNITY_GPNORTH_BASE + HV_DDI2_DDC_SDA_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPNORTH_BASE + HV_DDI2_DDC_SCL_MMIO_OFFSET, val); /* Tri-state CFIO 139 and 140 */ write32((void *)COMMUNITY_GPSOUTHWEST_BASE + CFIO_139_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPSOUTHWEST_BASE + CFIO_140_MMIO_OFFSET, val); } static void southbridge_smi_sleep(void) { uint32_t reg32; uint8_t slp_typ; uint16_t pmbase = get_pmbase(); /* First, disable further SMIs */ disable_smi(SLP_SMI_EN); /* Figure out SLP_TYP */ reg32 = inl(pmbase + 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) elog_gsmi_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_S1: printk(BIOS_DEBUG, "SMI#: Entering S1 (Assert STPCLK#)\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 pending wake status bit to avoid immediate wake */ write32((void *)(0xfed88000 + 0x0200), read32((void *)(0xfed88000 + 0x0200))); /* Tri-state specific GPIOS to avoid leakage during S3/S5 */ if ((slp_typ == ACPI_S3) || (slp_typ == ACPI_S5)) tristate_gpios(PAD_CONTROL_REG0_TRISTATE); /* * 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(pmbase + 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); } } /* * Look for Synchronous IO SMI and use save state from that core in case * we are not running on the same core that initiated the IO transaction. */ static em64t100_smm_state_save_area_t *smi_apmc_find_state_save(uint8_t cmd) { em64t100_smm_state_save_area_t *state; int node; /* 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); /* Check for Synchronous IO (bit0==1) */ if (!(state->io_misc_info & (1 << 0))) continue; /* Make sure it was a write (bit4==0) */ if (state->io_misc_info & (1 << 4)) continue; /* Check for APMC IO port */ if (((state->io_misc_info >> 16) & 0xff) != APM_CNT) continue; /* Check AX against the requested command */ if ((state->rax & 0xff) != cmd) continue; return state; } return NULL; } static void southbridge_smi_gsmi(void) { u32 *ret, *param; uint8_t sub_command; em64t100_smm_state_save_area_t *io_smi = smi_apmc_find_state_save(APM_CNT_ELOG_GSMI); if (!io_smi) return; /* Command and return value in EAX */ ret = (u32 *)&io_smi->rax; sub_command = (uint8_t)(*ret >> 8); /* Parameter buffer in EBX */ param = (u32 *)&io_smi->rbx; /* drivers/elog/gsmi.c */ *ret = gsmi_exec(sub_command, param); } static void southbridge_smi_store(void) { u8 sub_command, ret; em64t100_smm_state_save_area_t *io_smi = smi_apmc_find_state_save(APM_CNT_SMMSTORE); uint32_t reg_ebx; if (!io_smi) return; /* Command and return value in EAX */ sub_command = (io_smi->rax >> 8) & 0xff; /* Parameter buffer in EBX */ reg_ebx = io_smi->rbx; /* drivers/smmstore/smi.c */ ret = smmstore_exec(sub_command, (void *)reg_ebx); io_smi->rax = ret; } static void southbridge_smi_apmc(void) { uint8_t reg8; em64t100_smm_state_save_area_t *state; /* 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 = smi_apmc_find_state_save(reg8); if (state) { /* EBX in the state save contains the GNVS pointer */ gnvs = (global_nvs_t *)((uint32_t)state->rbx); smm_initialized = 1; printk(BIOS_DEBUG, "SMI#: Setting GNVS to %p\n", gnvs); } break; case APM_CNT_ELOG_GSMI: if (CONFIG(ELOG_GSMI)) southbridge_smi_gsmi(); break; case APM_CNT_SMMSTORE: if (CONFIG(SMMSTORE)) southbridge_smi_store(); break; } mainboard_smi_apmc(reg8); } static void southbridge_smi_pm1(void) { 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 */ elog_gsmi_add_event(ELOG_TYPE_POWER_BUTTON); disable_pm1_control(-1UL); enable_pm1_control(SLP_EN | (SLP_TYP_S5 << SLP_TYP_SHIFT)); } } static void southbridge_smi_gpe0(void) { clear_gpe_status(); } static void southbridge_smi_tco(void) { 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"); } } static void southbridge_smi_periodic(void) { uint32_t reg32; reg32 = inl(get_pmbase() + SMI_EN); /* Are periodic SMIs enabled? */ if ((reg32 & PERIODIC_EN) == 0) return; printk(BIOS_DEBUG, "Periodic SMI.\n"); } typedef void (*smi_handler_t)(void); static const smi_handler_t southbridge_smi[32] = { NULL, /* [0] reserved */ NULL, /* [1] reserved */ NULL, /* [2] BIOS_STS */ NULL, /* [3] LEGACY_USB_STS */ southbridge_smi_sleep, /* [4] SLP_SMI_STS */ southbridge_smi_apmc, /* [5] APM_STS */ NULL, /* [6] SWSMI_TMR_STS */ NULL, /* [7] reserved */ southbridge_smi_pm1, /* [8] PM1_STS */ southbridge_smi_gpe0, /* [9] GPE0_STS */ NULL, /* [10] reserved */ NULL, /* [11] reserved */ NULL, /* [12] reserved */ southbridge_smi_tco, /* [13] TCO_STS */ southbridge_smi_periodic, /* [14] PERIODIC_STS */ NULL, /* [15] SERIRQ_SMI_STS */ NULL, /* [16] SMBUS_SMI_STS */ NULL, /* [17] LEGACY_USB2_STS */ NULL, /* [18] INTEL_USB2_STS */ NULL, /* [19] reserved */ NULL, /* [20] PCI_EXP_SMI_STS */ NULL, /* [21] reserved */ NULL, /* [22] reserved */ NULL, /* [23] reserved */ NULL, /* [24] reserved */ NULL, /* [25] reserved */ NULL, /* [26] SPI_STS */ NULL, /* [27] reserved */ NULL, /* [28] PUNIT */ NULL, /* [29] GUNIT */ NULL, /* [30] reserved */ NULL /* [31] reserved */ }; void southbridge_smi_handler(void) { int i; uint32_t smi_sts; /* * 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(); /* 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](); } else { printk(BIOS_DEBUG, "SMI_STS[%d] occurred, but no handler available.\n", i); } } /* * The GPIO SMI events do not have a status bit in SMI_STS. Therefore, * these events need to be cleared and checked unconditionally. */ mainboard_smi_gpi(clear_alt_status()); }