| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <console/uart.h> |
| #include <cpu/x86/smm.h> |
| #include <device/pci.h> |
| #include <drivers/uart/uart8250reg.h> |
| #include <intelblocks/smihandler.h> |
| #include <soc/pci_devs.h> |
| #include <soc/pm.h> |
| |
| struct uart8250_state { |
| uint8_t IER, IIR, MCR, LCR, DLL, DLM; |
| }; |
| |
| static struct uart8250_state s_uart8250_state; |
| |
| static void uart8250_store(unsigned int base_port) |
| { |
| /* Save previous state for restoring later. */ |
| s_uart8250_state.IER = inb(base_port + UART8250_IER); |
| s_uart8250_state.IIR = inb(base_port + UART8250_FCR); |
| s_uart8250_state.MCR = inb(base_port + UART8250_MCR); |
| s_uart8250_state.LCR = inb(base_port + UART8250_LCR); |
| s_uart8250_state.DLL = inb(base_port + UART8250_DLL); |
| s_uart8250_state.DLM = inb(base_port + UART8250_DLM); |
| } |
| |
| void smm_soc_early_init(void) |
| { |
| if (CONFIG(DRIVERS_UART_8250IO) && CONFIG(DEBUG_SMI)) |
| uart8250_store(uart_platform_base(CONFIG_UART_FOR_CONSOLE)); |
| } |
| |
| static void uart8250_restore(unsigned int base_port) |
| { |
| outb(s_uart8250_state.DLL, base_port + UART8250_DLL); |
| outb(s_uart8250_state.DLM, base_port + UART8250_DLM); |
| outb(s_uart8250_state.MCR, base_port + UART8250_MCR); |
| outb(s_uart8250_state.LCR, base_port + UART8250_LCR); |
| if ((s_uart8250_state.IIR & UART8250_IIR_FIFO_EN) == UART8250_IIR_FIFO_EN) |
| outb(UART8250_FCR_FIFO_EN, base_port + UART8250_FCR); |
| outb(s_uart8250_state.IER, base_port + UART8250_IER); |
| } |
| |
| void smm_soc_exit(void) |
| { |
| if (CONFIG(DRIVERS_UART_8250IO) && CONFIG(DEBUG_SMI)) |
| uart8250_restore(uart_platform_base(CONFIG_UART_FOR_CONSOLE)); |
| } |
| |
| /* |
| * Specific SOC SMI handler during ramstage finalize phase |
| */ |
| void smihandler_soc_at_finalize(void) |
| { |
| /* SMM_FEATURE_CONTROL can only be written within SMM. */ |
| printk(BIOS_DEBUG, "Lock SMM_FEATURE_CONTROL\n"); |
| pci_devfn_t pcie_offset = soc_get_ubox_pmon_dev(); |
| if (!pcie_offset) { |
| printk(BIOS_ERR, "UBOX PMON is not found, cannot lock SMM_FEATURE_CONTROL!\n"); |
| return; |
| } |
| |
| u32 val; |
| val = pci_s_read_config32(pcie_offset, SMM_FEATURE_CONTROL); |
| val |= (SMM_CODE_CHK_EN | SMM_FEATURE_CONTROL_LOCK); |
| pci_s_write_config32(pcie_offset, SMM_FEATURE_CONTROL, val); |
| } |
| |
| /* |
| * This is the generic entry for SOC SMIs |
| */ |
| void cpu_smi_handler(void) |
| { |
| |
| } |
| |
| /* This is needed by common SMM code */ |
| const smi_handler_t southbridge_smi[SMI_STS_BITS] = { |
| [APM_STS_BIT] = smihandler_southbridge_apmc, |
| [PM1_STS_BIT] = smihandler_southbridge_pm1, |
| #if CONFIG(SOC_INTEL_COMMON_BLOCK_SMM_TCO_ENABLE) |
| [TCO_STS_BIT] = smihandler_southbridge_tco, |
| #endif |
| }; |