357 lines
8.4 KiB
C
357 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <stdint.h>
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#include <arch/hlt.h>
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#include <arch/io.h>
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#include <device/pci_ops.h>
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#include <console/console.h>
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#include <cpu/x86/cache.h>
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#include <cpu/x86/smm.h>
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#include <cpu/intel/em64t100_save_state.h>
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#include <device/pci_def.h>
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#include <intelblocks/fast_spi.h>
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#include <spi-generic.h>
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#include <soc/iomap.h>
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#include <soc/soc_util.h>
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#include <soc/pm.h>
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#include <soc/nvs.h>
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static int smm_initialized;
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int southbridge_io_trap_handler(int smif)
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{
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switch (smif) {
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case 0x32:
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printk(BIOS_DEBUG, "OS Init\n");
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/* gnvs->smif:
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* On success, the IO Trap Handler returns 0
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* On failure, the IO Trap Handler returns a value != 0
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*/
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gnvs->smif = 0;
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return 1; /* IO trap handled */
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}
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/* Not handled */
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return 0;
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}
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void southbridge_smi_set_eos(void)
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{
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enable_smi(EOS);
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}
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static void busmaster_disable_on_bus(int bus)
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{
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int slot, func;
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unsigned int val;
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unsigned char hdr;
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for (slot = 0; slot < 0x20; slot++) {
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for (func = 0; func < 8; func++) {
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u16 reg16;
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pci_devfn_t dev = PCI_DEV(bus, slot, func);
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val = pci_read_config32(dev, PCI_VENDOR_ID);
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if (val == 0xffffffff || val == 0x00000000 ||
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val == 0x0000ffff || val == 0xffff0000)
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continue;
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/* Disable Bus Mastering for this one device */
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reg16 = pci_read_config16(dev, PCI_COMMAND);
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reg16 &= ~PCI_COMMAND_MASTER;
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pci_write_config16(dev, PCI_COMMAND, reg16);
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/* If this is a bridge, then follow it. */
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hdr = pci_read_config8(dev, PCI_HEADER_TYPE);
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hdr &= 0x7f;
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if (hdr == PCI_HEADER_TYPE_BRIDGE ||
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hdr == PCI_HEADER_TYPE_CARDBUS) {
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unsigned int buses;
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buses = pci_read_config32(dev, PCI_PRIMARY_BUS);
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busmaster_disable_on_bus((buses >> 8) & 0xff);
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}
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}
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}
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}
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static void southbridge_smi_sleep(void)
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{
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uint32_t reg32;
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uint8_t slp_typ;
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uint16_t pmbase = get_pmbase();
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/* First, disable further SMIs */
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disable_smi(SLP_SMI_EN);
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/* Figure out SLP_TYP */
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reg32 = inl((uint16_t)(pmbase + PM1_CNT));
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printk(BIOS_SPEW, "SMI#: SLP = 0x%08x\n", reg32);
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slp_typ = (reg32 >> 10) & 7;
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/* Do any mainboard sleep handling */
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mainboard_smi_sleep((uint8_t)(slp_typ - 2));
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/* Next, do the deed.
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*/
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switch (slp_typ) {
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case SLP_TYP_S0:
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printk(BIOS_DEBUG, "SMI#: Entering S0 (On)\n");
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break;
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case SLP_TYP_S1:
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printk(BIOS_DEBUG, "SMI#: Entering S1 (Assert STPCLK#)\n");
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break;
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case SLP_TYP_S3:
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printk(BIOS_DEBUG, "SMI#: Entering S3 (Suspend-To-RAM)\n");
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/* Invalidate the cache before going to S3 */
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wbinvd();
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break;
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case SLP_TYP_S4:
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printk(BIOS_DEBUG, "SMI#: Entering S4 (Suspend-To-Disk)\n");
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break;
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case SLP_TYP_S5:
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printk(BIOS_DEBUG, "SMI#: Entering S5 (Soft Power off)\n");
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/* Disable all GPE */
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disable_all_gpe();
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/* also iterates over all bridges on bus 0 */
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busmaster_disable_on_bus(0);
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break;
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default:
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printk(BIOS_DEBUG, "SMI#: ERROR: SLP_TYP reserved\n");
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break;
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}
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/* Write back to the SLP register to cause the originally intended
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* event again. We need to set BIT13 (SLP_EN) though to make the
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* sleep happen.
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*/
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enable_pm1_control(SLP_EN);
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/* Make sure to stop executing code here for S3/S4/S5 */
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if (slp_typ > 1)
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hlt();
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/* In most sleep states, the code flow of this function ends at
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* the line above. However, if we entered sleep state S1 and wake
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* up again, we will continue to execute code in this function.
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*/
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reg32 = inl((uint16_t)(pmbase + PM1_CNT));
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if (reg32 & SCI_EN) {
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/* The OS is not an ACPI OS, so we set the state to S0 */
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disable_pm1_control(SLP_EN | SLP_TYP);
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}
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}
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/*
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* Look for Synchronous IO SMI and use save state from that
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* core in case we are not running on the same core that
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* initiated the IO transaction.
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*/
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static em64t100_smm_state_save_area_t *smi_apmc_find_state_save(uint8_t cmd)
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{
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em64t100_smm_state_save_area_t *state;
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int node;
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/* Check all nodes looking for the one that issued the IO */
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for (node = 0; node < CONFIG_MAX_CPUS; node++) {
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state = smm_get_save_state(node);
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/* Check for Synchronous IO (bit0==1) */
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if (!(state->io_misc_info & (1 << 0)))
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continue;
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/* Make sure it was a write (bit4==0) */
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if (state->io_misc_info & (1 << 4))
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continue;
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/* Check for APMC IO port */
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if (((state->io_misc_info >> 16) & 0xff) != APM_CNT)
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continue;
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/* Check AX against the requested command */
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if ((state->rax & 0xff) != cmd)
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continue;
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return state;
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}
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return NULL;
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}
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static void finalize(void)
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{
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static int finalize_done;
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if (finalize_done) {
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printk(BIOS_DEBUG, "SMM already finalized.\n");
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return;
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}
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finalize_done = 1;
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if (CONFIG(SPI_FLASH_SMM))
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/* Re-init SPI driver to handle locked BAR */
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fast_spi_init();
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}
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static void southbridge_smi_apmc(void)
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{
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uint8_t reg8;
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em64t100_smm_state_save_area_t *state;
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/* Emulate B2 register as the FADT / Linux expects it */
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reg8 = inb(APM_CNT);
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switch (reg8) {
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case APM_CNT_CST_CONTROL:
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/* Calling this function seems to cause
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* some kind of race condition in Linux
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* and causes a kernel oops
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*/
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printk(BIOS_DEBUG, "C-state control\n");
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break;
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case APM_CNT_PST_CONTROL:
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/* Calling this function seems to cause
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* some kind of race condition in Linux
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* and causes a kernel oops
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*/
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printk(BIOS_DEBUG, "P-state control\n");
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break;
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case APM_CNT_ACPI_DISABLE:
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disable_pm1_control(SCI_EN);
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printk(BIOS_DEBUG, "SMI#: ACPI disabled.\n");
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break;
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case APM_CNT_ACPI_ENABLE:
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enable_pm1_control(SCI_EN);
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printk(BIOS_DEBUG, "SMI#: ACPI enabled.\n");
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break;
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case APM_CNT_FINALIZE:
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finalize();
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break;
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case APM_CNT_GNVS_UPDATE:
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if (smm_initialized) {
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printk(BIOS_DEBUG,
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"SMI#: SMM structures already initialized!\n");
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return;
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}
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state = smi_apmc_find_state_save(reg8);
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if (state) {
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/* EBX in the state save contains the GNVS pointer */
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gnvs = (struct global_nvs *)((uint32_t)state->rbx);
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smm_initialized = 1;
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printk(BIOS_DEBUG, "SMI#: Setting GNVS to %p\n", gnvs);
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}
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break;
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}
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mainboard_smi_apmc(reg8);
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}
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static void southbridge_smi_pm1(void)
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{
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uint16_t pm1_sts = clear_pm1_status();
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/* While OSPM is not active, poweroff immediately
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* on a power button event.
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*/
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if (pm1_sts & PWRBTN_STS) {
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// power button pressed
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disable_pm1_control(-1UL);
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enable_pm1_control(SLP_EN | (SLP_TYP_S5 << SLP_TYP_SHIFT));
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}
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}
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static void southbridge_smi_gpe0(void) { clear_gpe_status(); }
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static void southbridge_smi_tco(void)
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{
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uint32_t tco_sts = clear_tco_status();
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/* Any TCO event? */
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if (!tco_sts)
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return;
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if (tco_sts & TCO1_STS_TIMEOUT) { /* TIMEOUT */
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/* Handle TCO timeout */
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printk(BIOS_DEBUG, "TCO Timeout.\n");
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}
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}
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static void southbridge_smi_periodic(void)
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{
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uint32_t reg32;
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reg32 = inl((uint16_t)(get_pmbase() + SMI_EN));
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/* Are periodic SMIs enabled? */
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if ((reg32 & PERIODIC_EN) == 0)
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return;
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printk(BIOS_DEBUG, "Periodic SMI.\n");
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}
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typedef void (*smi_handler_t)(void);
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static const smi_handler_t southbridge_smi[32] = {
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NULL, // [0] reserved
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NULL, // [1] reserved
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NULL, // [2] BIOS_STS
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NULL, // [3] LEGACY_USB_STS
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southbridge_smi_sleep, // [4] SLP_SMI_STS
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southbridge_smi_apmc, // [5] APM_STS
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NULL, // [6] SWSMI_TMR_STS
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NULL, // [7] reserved
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southbridge_smi_pm1, // [8] PM1_STS
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southbridge_smi_gpe0, // [9] GPE0_STS
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NULL, // [10] reserved
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NULL, // [11] reserved
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NULL, // [12] reserved
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southbridge_smi_tco, // [13] TCO_STS
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southbridge_smi_periodic, // [14] PERIODIC_STS
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NULL, // [15] SERIRQ_SMI_STS
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NULL, // [16] SMBUS_SMI_STS
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NULL, // [17] LEGACY_USB2_STS
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NULL, // [18] INTEL_USB2_STS
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NULL, // [19] reserved
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NULL, // [20] PCI_EXP_SMI_STS
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NULL, // [21] reserved
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NULL, // [22] reserved
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NULL, // [23] reserved
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NULL, // [24] reserved
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NULL, // [25] reserved
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NULL, // [26] SPI_STS
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NULL, // [27] reserved
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NULL, // [28] PUNIT
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NULL, // [29] GUNIT
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NULL, // [30] reserved
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NULL // [31] reserved
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};
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void southbridge_smi_handler(void)
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{
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int i;
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uint32_t smi_sts;
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/* We need to clear the SMI status registers, or we won't see what's
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* happening in the following calls.
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*/
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smi_sts = clear_smi_status();
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/* Call SMI sub handler for each of the status bits */
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for (i = 0; i < ARRAY_SIZE(southbridge_smi); i++) {
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if (!(smi_sts & (1 << i)))
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continue;
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if (southbridge_smi[i] != NULL) {
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southbridge_smi[i]();
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} else {
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printk(BIOS_DEBUG, "SMI_STS[%d] occurred, but no "
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"handler available.\n",
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i);
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}
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}
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}
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