/* SPDX-License-Identifier: GPL-2.0-only */ #include <arch/io.h> #include <console/console.h> #include <device/device.h> #include <delay.h> #include "ec.h" #include "chip.h" static u16 ec_cmd_reg = 0; static u16 ec_data_reg = 0; static inline u8 __ec_read(u8 addr) { outb(addr, ec_cmd_reg); return inb(ec_data_reg); } static inline void __ec_write(u8 addr, u8 data) { outb(addr, ec_cmd_reg); outb(data, ec_data_reg); } static int ec_ready(void) { u16 timeout = EC_TIMEOUT; if (!ec_cmd_reg || !ec_data_reg) { printk(BIOS_DEBUG, "Invalid ports: cmd=0x%x data=0x%x\n", ec_cmd_reg, ec_data_reg); return -1; } while (__ec_read(EC_MAILBOX_COMMAND) != 0 && --timeout) { udelay(10); if ((timeout & 0xff) == 0) printk(BIOS_SPEW, "."); } if (!timeout) { printk(BIOS_DEBUG, "Timeout waiting for EC to be ready.\n"); return -1; } return 0; } int send_ec_command(u8 command) { if (ec_ready() < 0) return -1; __ec_write(EC_MAILBOX_COMMAND, command); return ec_ready(); } int send_ec_command_data(u8 command, u8 data) { if (ec_ready() < 0) return -1; __ec_write(EC_MAILBOX_DATA, data); __ec_write(EC_MAILBOX_COMMAND, command); return ec_ready(); } u8 read_ec_command_byte(u8 command) { send_ec_command(command); return __ec_read(EC_MAILBOX_DATA); } u8 ec_read(u8 addr) { if (send_ec_command_data(EC_RAM_READ, addr) < 0) return 0; return __ec_read(EC_MAILBOX_DATA); } int ec_write(u8 addr, u8 data) { if (ec_ready() < 0) return -1; __ec_write(EC_MAILBOX_DATA, addr); __ec_write(EC_MAILBOX_DATA_H, data); __ec_write(EC_MAILBOX_COMMAND, EC_RAM_WRITE); return ec_ready(); } void ec_set_bit(u8 addr, u8 bit) { ec_write(addr, ec_read(addr) | (1 << bit)); } void ec_clr_bit(u8 addr, u8 bit) { ec_write(addr, ec_read(addr) & ~(1 << bit)); } void ec_set_ports(u16 cmd_reg, u16 data_reg) { ec_cmd_reg = cmd_reg; ec_data_reg = data_reg; } static void mec1308_enable(struct device *dev) { DEVTREE_CONST struct ec_smsc_mec1308_config *conf = dev->chip_info; if (conf->mailbox_port) { ec_cmd_reg = conf->mailbox_port; ec_data_reg = conf->mailbox_port + 1; } } struct chip_operations ec_smsc_mec1308_ops = { CHIP_NAME("SMSC MEC1308 EC Mailbox Interface") .enable_dev = mec1308_enable };