| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <arch/io.h> |
| #include <delay.h> |
| #include <stdint.h> |
| #include "ec.h" |
| |
| static u16 ec_cmd_reg = EC_SC; |
| static u16 ec_data_reg = EC_DATA; |
| |
| int send_ec_command(u8 command) |
| { |
| int timeout; |
| |
| timeout = 0x7ff; |
| while ((inb(ec_cmd_reg) & EC_IBF) && --timeout) { |
| udelay(10); |
| if ((timeout & 0xff) == 0) |
| printk(BIOS_SPEW, "."); |
| } |
| if (!timeout) { |
| printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n", |
| command); |
| // return -1; |
| } |
| |
| udelay(10); |
| |
| outb(command, ec_cmd_reg); |
| return 0; |
| } |
| |
| int send_ec_data(u8 data) |
| { |
| int timeout; |
| |
| timeout = 0x7ff; |
| while ((inb(ec_cmd_reg) & EC_IBF) && --timeout) { // wait for IBF = 0 |
| udelay(10); |
| if ((timeout & 0xff) == 0) |
| printk(BIOS_SPEW, "."); |
| } |
| if (!timeout) { |
| printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n", |
| data); |
| // return -1; |
| } |
| |
| udelay(10); |
| |
| outb(data, ec_data_reg); |
| |
| return 0; |
| } |
| |
| int send_ec_data_nowait(u8 data) |
| { |
| outb(data, ec_data_reg); |
| |
| return 0; |
| } |
| |
| u8 recv_ec_data(void) |
| { |
| int timeout; |
| u8 data; |
| |
| timeout = 0x7fff; |
| while (--timeout) { // Wait for OBF = 1 |
| if (inb(ec_cmd_reg) & EC_OBF) { |
| break; |
| } |
| udelay(10); |
| if ((timeout & 0xff) == 0) |
| printk(BIOS_SPEW, "."); |
| } |
| if (!timeout) { |
| printk(BIOS_DEBUG, "\nTimeout while receiving data from EC!\n"); |
| // return -1; |
| } |
| |
| udelay(10); |
| |
| data = inb(ec_data_reg); |
| printk(BIOS_SPEW, "recv_ec_data: 0x%02x\n", data); |
| |
| return data; |
| } |
| |
| void ec_clear_out_queue(void) |
| { |
| int timeout = 0x7fff; |
| printk(BIOS_SPEW, "Clearing EC output queue...\n"); |
| while (--timeout && (inb(ec_cmd_reg) & EC_OBF)) { |
| u8 data = inb(ec_data_reg); |
| printk(BIOS_SPEW, "Discarding a garbage byte: 0x%02x\n", data); |
| udelay(10); |
| } |
| if (!timeout) |
| printk(BIOS_ERR, "Timeout while clearing EC output queue!\n"); |
| else |
| printk(BIOS_SPEW, "EC output queue has been cleared.\n"); |
| } |
| |
| u8 ec_read(u8 addr) |
| { |
| send_ec_command(0x80); |
| send_ec_data(addr); |
| |
| return recv_ec_data(); |
| } |
| |
| int ec_write(u8 addr, u8 data) |
| { |
| send_ec_command(0x81); |
| send_ec_data(addr); |
| return send_ec_data(data); |
| } |
| |
| u8 ec_status(void) |
| { |
| return inb(ec_cmd_reg); |
| } |
| |
| u8 ec_query(void) |
| { |
| send_ec_command(0x84); |
| return recv_ec_data(); |
| } |
| |
| 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) |
| { |
| if (!ENV_STAGE_HAS_DATA_SECTION) |
| return; |
| |
| ec_cmd_reg = cmd_reg; |
| ec_data_reg = data_reg; |
| } |
| |
| struct chip_operations ec_acpi_ops = { |
| CHIP_NAME("ACPI Embedded Controller") |
| }; |