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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <arch/io.h>
#include <delay.h>
#include <types.h>
#include "ec.h"
#define EC_POLL_DELAY_US 10
#define EC_SEND_TIMEOUT_US 20000 // 20ms
#define EC_RECV_TIMEOUT_US 320000 // 320ms
static u16 ec_cmd_reg = EC_SC;
static u16 ec_data_reg = EC_DATA;
/*
* Poll the EC status/command register for a specified
* state until the given timeout elapses.
*/
static int wait_ec_sc(int timeout_us, u8 mask, u8 state)
{
while (timeout_us > 0 && (inb(ec_cmd_reg) & mask) != state) {
udelay(EC_POLL_DELAY_US);
timeout_us -= EC_POLL_DELAY_US;
}
return timeout_us > 0 ? 0 : -1;
}
bool ec_ready_send(int timeout_us)
{
return wait_ec_sc(timeout_us, EC_IBF, 0) == 0;
}
bool ec_ready_recv(int timeout_us)
{
return wait_ec_sc(timeout_us, EC_OBF, EC_OBF) == 0;
}
int send_ec_command(u8 command)
{
return send_ec_command_timeout(command, EC_SEND_TIMEOUT_US);
}
int send_ec_command_timeout(u8 command, int timeout_us)
{
if (!ec_ready_send(timeout_us)) {
printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n",
command);
return -1;
}
outb(command, ec_cmd_reg);
return 0;
}
int send_ec_data(u8 data)
{
return send_ec_data_timeout(data, EC_SEND_TIMEOUT_US);
}
int send_ec_data_timeout(u8 data, int timeout_us)
{
if (!ec_ready_send(timeout_us)) {
printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n",
data);
return -1;
}
outb(data, ec_data_reg);
return 0;
}
int recv_ec_data(void)
{
return recv_ec_data_timeout(EC_RECV_TIMEOUT_US);
}
int recv_ec_data_timeout(int timeout_us)
{
u8 data;
if (!ec_ready_recv(timeout_us)) {
printk(BIOS_DEBUG, "Timeout while receiving data from EC!\n");
return -1;
}
data = inb(ec_data_reg);
printk(BIOS_SPEW, "Data from EC: 0x%02x\n", data);
return data;
}
void ec_clear_out_queue(void)
{
int timeout = EC_RECV_TIMEOUT_US;
printk(BIOS_SPEW, "Clearing EC output queue...\n");
while (timeout > 0 && inb(ec_cmd_reg) & EC_OBF) {
u8 data = inb(ec_data_reg);
printk(BIOS_SPEW, "Discarding a garbage byte: 0x%02x\n", data);
udelay(EC_POLL_DELAY_US);
timeout -= EC_POLL_DELAY_US;
}
if (timeout <= 0)
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(RD_EC);
send_ec_data(addr);
return recv_ec_data();
}
int ec_write(u8 addr, u8 data)
{
send_ec_command(WR_EC);
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(QR_EC);
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)
{
ec_cmd_reg = cmd_reg;
ec_data_reg = data_reg;
}
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