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/* 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")
};
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