| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2008-2009 coresystems GmbH |
| * Copyright 2013 Google Inc. |
| * |
| * 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 <delay.h> |
| #include <types.h> |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <cpu/x86/cache.h> |
| #include <device/pci_def.h> |
| #include <cpu/x86/smm.h> |
| #include <elog.h> |
| #include <halt.h> |
| #include <pc80/mc146818rtc.h> |
| #include "pch.h" |
| |
| #include "nvs.h" |
| |
| |
| static u8 smm_initialized = 0; |
| |
| /* GNVS needs to be updated by an 0xEA PM Trap (B2) after it has been located |
| * by coreboot. |
| */ |
| static global_nvs_t *gnvs; |
| global_nvs_t *smm_get_gnvs(void) |
| { |
| return gnvs; |
| } |
| |
| 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; |
| } |
| |
| /** |
| * @brief Set the EOS bit |
| */ |
| void southbridge_smi_set_eos(void) |
| { |
| enable_smi(EOS); |
| } |
| |
| 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; |
| 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 */ |
| reg32 = pci_read_config32(dev, PCI_COMMAND); |
| reg32 &= ~PCI_COMMAND_MASTER; |
| pci_write_config32(dev, PCI_COMMAND, reg32); |
| |
| /* 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 southbridge_smi_sleep(void) |
| { |
| u8 reg8; |
| u32 reg32; |
| u8 slp_typ; |
| u8 s5pwr = CONFIG_MAINBOARD_POWER_ON_AFTER_POWER_FAIL; |
| u16 pmbase = get_pmbase(); |
| |
| // save and recover RTC port values |
| u8 tmp70, tmp72; |
| tmp70 = inb(0x70); |
| tmp72 = inb(0x72); |
| get_option(&s5pwr, "power_on_after_fail"); |
| outb(tmp70, 0x70); |
| outb(tmp72, 0x72); |
| |
| /* 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); |
| |
| /* USB sleep preparations */ |
| #if !IS_ENABLED(CONFIG_FINALIZE_USB_ROUTE_XHCI) |
| usb_ehci_sleep_prepare(PCH_EHCI1_DEV, slp_typ); |
| usb_ehci_sleep_prepare(PCH_EHCI2_DEV, slp_typ); |
| #endif |
| usb_xhci_sleep_prepare(PCH_XHCI_DEV, slp_typ); |
| |
| #if IS_ENABLED(CONFIG_ELOG_GSMI) |
| /* Log S3, S4, and S5 entry */ |
| if (slp_typ >= ACPI_S3) |
| elog_add_event_byte(ELOG_TYPE_ACPI_ENTER, slp_typ); |
| #endif |
| |
| /* 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(); |
| |
| /* Always set the flag in case CMOS was changed on runtime. For |
| * "KEEP", switch to "OFF" - KEEP is software emulated |
| */ |
| reg8 = pci_read_config8(PCI_DEV(0, 0x1f, 0), GEN_PMCON_3); |
| if (s5pwr == MAINBOARD_POWER_ON) { |
| reg8 &= ~1; |
| } else { |
| reg8 |= 1; |
| } |
| pci_write_config8(PCI_DEV(0, 0x1f, 0), GEN_PMCON_3, reg8); |
| |
| /* 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; |
| } |
| |
| /* 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) |
| halt(); |
| |
| /* 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 em64t101_smm_state_save_area_t *smi_apmc_find_state_save(u8 cmd) |
| { |
| em64t101_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; |
| } |
| |
| #if IS_ENABLED(CONFIG_ELOG_GSMI) |
| static void southbridge_smi_gsmi(void) |
| { |
| u32 *ret, *param; |
| u8 sub_command; |
| em64t101_smm_state_save_area_t *io_smi = |
| smi_apmc_find_state_save(ELOG_GSMI_APM_CNT); |
| |
| if (!io_smi) |
| return; |
| |
| /* Command and return value in EAX */ |
| ret = (u32*)&io_smi->rax; |
| sub_command = (u8)(*ret >> 8); |
| |
| /* Parameter buffer in EBX */ |
| param = (u32*)&io_smi->rbx; |
| |
| /* drivers/elog/gsmi.c */ |
| *ret = gsmi_exec(sub_command, param); |
| } |
| #endif |
| |
| static void southbridge_smi_apmc(void) |
| { |
| u8 reg8; |
| em64t101_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 *)((u32)state->rbx); |
| smm_initialized = 1; |
| printk(BIOS_DEBUG, "SMI#: Setting GNVS to %p\n", gnvs); |
| } |
| break; |
| case 0xca: |
| usb_xhci_route_all(); |
| break; |
| #if IS_ENABLED(CONFIG_ELOG_GSMI) |
| case ELOG_GSMI_APM_CNT: |
| southbridge_smi_gsmi(); |
| break; |
| #endif |
| } |
| |
| mainboard_smi_apmc(reg8); |
| } |
| |
| static void southbridge_smi_pm1(void) |
| { |
| u16 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); |
| #endif |
| disable_pm1_control(-1UL); |
| enable_pm1_control(SLP_EN | (SLP_TYP_S5 << 10)); |
| } |
| } |
| |
| static void southbridge_smi_gpe0(void) |
| { |
| clear_gpe_status(); |
| } |
| |
| static void southbridge_smi_gpi(void) |
| { |
| mainboard_smi_gpi(clear_alt_smi_status()); |
| |
| /* Clear again after mainboard handler */ |
| clear_alt_smi_status(); |
| } |
| |
| static void southbridge_smi_mc(void) |
| { |
| u32 reg32; |
| |
| reg32 = inl(get_pmbase() + SMI_EN); |
| |
| /* Are microcontroller SMIs enabled? */ |
| if ((reg32 & MCSMI_EN) == 0) |
| return; |
| |
| printk(BIOS_DEBUG, "Microcontroller SMI.\n"); |
| } |
| |
| |
| |
| static void southbridge_smi_tco(void) |
| { |
| u32 tco_sts = clear_tco_status(); |
| |
| /* Any TCO event? */ |
| if (!tco_sts) |
| return; |
| |
| if (tco_sts & (1 << 8)) { // BIOSWR |
| u8 bios_cntl; |
| |
| bios_cntl = pci_read_config16(PCI_DEV(0, 0x1f, 0), 0xdc); |
| |
| if (bios_cntl & 1) { |
| /* BWE is RW, so the SMI was caused by a |
| * write to BWE, not by a write to the BIOS |
| */ |
| |
| /* This is the place where we notice someone |
| * is trying to tinker with the BIOS. We are |
| * trying to be nice and just ignore it. A more |
| * resolute answer would be to power down the |
| * box. |
| */ |
| printk(BIOS_DEBUG, "Switching back to RO\n"); |
| pci_write_config32(PCI_DEV(0, 0x1f, 0), 0xdc, |
| (bios_cntl & ~1)); |
| } /* No else for now? */ |
| } else if (tco_sts & (1 << 3)) { /* TIMEOUT */ |
| /* Handle TCO timeout */ |
| printk(BIOS_DEBUG, "TCO Timeout.\n"); |
| } |
| } |
| |
| static void southbridge_smi_periodic(void) |
| { |
| u32 reg32; |
| |
| reg32 = inl(get_pmbase() + SMI_EN); |
| |
| /* Are periodic SMIs enabled? */ |
| if ((reg32 & PERIODIC_EN) == 0) |
| return; |
| |
| printk(BIOS_DEBUG, "Periodic SMI.\n"); |
| } |
| |
| static void southbridge_smi_monitor(void) |
| { |
| #define IOTRAP(x) (trap_sts & (1 << x)) |
| u32 trap_sts, trap_cycle; |
| u32 data, mask = 0; |
| int i; |
| |
| trap_sts = RCBA32(0x1e00); // TRSR - Trap Status Register |
| RCBA32(0x1e00) = trap_sts; // Clear trap(s) in TRSR |
| |
| trap_cycle = RCBA32(0x1e10); |
| for (i=16; i<20; i++) { |
| if (trap_cycle & (1 << i)) |
| mask |= (0xff << ((i - 16) << 2)); |
| } |
| |
| |
| /* IOTRAP(3) SMI function call */ |
| if (IOTRAP(3)) { |
| if (gnvs && gnvs->smif) |
| io_trap_handler(gnvs->smif); // call function smif |
| return; |
| } |
| |
| /* IOTRAP(2) currently unused |
| * IOTRAP(1) currently unused */ |
| |
| /* IOTRAP(0) SMIC */ |
| if (IOTRAP(0)) { |
| if (!(trap_cycle & (1 << 24))) { // It's a write |
| printk(BIOS_DEBUG, "SMI1 command\n"); |
| data = RCBA32(0x1e18); |
| data &= mask; |
| // if (smi1) |
| // southbridge_smi_command(data); |
| // return; |
| } |
| // Fall through to debug |
| } |
| |
| printk(BIOS_DEBUG, " trapped io address = 0x%x\n", |
| trap_cycle & 0xfffc); |
| for (i=0; i < 4; i++) |
| if (IOTRAP(i)) printk(BIOS_DEBUG, " TRAP = %d\n", i); |
| printk(BIOS_DEBUG, " AHBE = %x\n", (trap_cycle >> 16) & 0xf); |
| printk(BIOS_DEBUG, " MASK = 0x%08x\n", mask); |
| printk(BIOS_DEBUG, " read/write: %s\n", |
| (trap_cycle & (1 << 24)) ? "read" : "write"); |
| |
| if (!(trap_cycle & (1 << 24))) { |
| /* Write Cycle */ |
| data = RCBA32(0x1e18); |
| printk(BIOS_DEBUG, " iotrap written data = 0x%08x\n", data); |
| } |
| #undef IOTRAP |
| } |
| |
| typedef void (*smi_handler_t)(void); |
| |
| static 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 |
| southbridge_smi_gpi, // [10] GPI_STS |
| southbridge_smi_mc, // [11] MCSMI_STS |
| NULL, // [12] DEVMON_STS |
| 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 |
| southbridge_smi_monitor, // [21] MONITOR_STS |
| NULL, // [22] reserved |
| NULL, // [23] reserved |
| NULL, // [24] reserved |
| NULL, // [25] EL_SMI_STS |
| NULL, // [26] SPI_STS |
| NULL, // [27] reserved |
| NULL, // [28] reserved |
| NULL, // [29] reserved |
| NULL, // [30] reserved |
| NULL // [31] reserved |
| }; |
| |
| /** |
| * @brief Interrupt handler for SMI# |
| */ |
| void southbridge_smi_handler(void) |
| { |
| int i; |
| u32 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 < 31; i++) { |
| if (smi_sts & (1 << i)) { |
| if (southbridge_smi[i]) { |
| southbridge_smi[i](); |
| } else { |
| printk(BIOS_DEBUG, |
| "SMI_STS[%d] occurred, but no " |
| "handler available.\n", i); |
| } |
| } |
| } |
| } |