blob: 5de63360405587ed50a5a4d5a2c0370e311c8835 [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pnp.h>
#include <delay.h>
#include <elog.h>
#include <pc80/keyboard.h>
#include "ec.h"
#include "chip.h"
/* kbc helper functions from drivers/pc80/keyboard.c */
static int ec_input_buffer_empty(u8 status_port)
{
u32 timeout;
for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(status_port) & KBD_IBF);
timeout--) {
mdelay(1);
}
if (!timeout) {
printk(BIOS_WARNING, "Unexpected EC/KBD input buffer full\n");
}
return !!timeout;
}
static int ec_output_buffer_full(u8 status_port)
{
u32 timeout;
for (timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(status_port)
& KBD_OBF) == 0); timeout--) {
mdelay(1);
}
if (!timeout) {
printk(BIOS_INFO, "EC/KBD output buffer result timeout\n");
}
return !!timeout;
}
/* The ENE 60/64 EC registers are the same command/status IB/OB KBC pair.
* Check status from 64 port before each command.
*
* Ex. Get panel ID command C43/D77
* Check IBF empty. Then Write 0x43(CMD) to 0x64 Port
* Check IBF empty. Then Write 0x77(DATA) to 0x60 Port
* Check OBF set. Then Get Data(0x03:panel ID) from 0x60
* Different commands return may or may not respond and may have multiple
* bytes. Keep it simple for now
*/
u8 ec_kbc_read_ob(void)
{
if (!ec_output_buffer_full(KBD_STATUS)) return 0;
return inb(KBD_DATA);
}
void ec_kbc_write_cmd(u8 cmd)
{
if (!ec_input_buffer_empty(KBD_STATUS)) return;
outb(cmd, KBD_COMMAND);
}
void ec_kbc_write_ib(u8 data)
{
if (!ec_input_buffer_empty(KBD_STATUS)) return;
outb(data, KBD_DATA);
}
/* EC Host Control Protocol routines */
u8 ec_read_ob(void)
{
if (!ec_output_buffer_full(EC_SC)) return 0;
return inb(EC_DATA);
}
void ec_write_cmd(u8 cmd)
{
if (!ec_input_buffer_empty(EC_SC)) return;
outb(cmd, EC_COMMAND);
}
void ec_write_ib(u8 data)
{
if (!ec_input_buffer_empty(EC_SC)) return;
outb(data, EC_DATA);
}
/*
* These functions are for accessing the ENE932 device RAM space
*/
u8 ec_mem_read(u8 addr)
{
ec_write_cmd(EC_CMD_READ_RAM);
ec_write_ib(addr);
return ec_read_ob();
}
void ec_mem_write(u8 addr, u8 data)
{
ec_write_cmd(EC_CMD_WRITE_RAM);
ec_write_ib(addr);
ec_write_ib(data);
return;
}
static void ene_kb3940q_log_events(void)
{
if (CONFIG(ELOG)) {
u8 reason = ec_mem_read(EC_SHUTDOWN_REASON);
if (reason)
elog_add_event_byte(ELOG_TYPE_EC_SHUTDOWN, reason);
}
}
static void ene_kb3940q_init(struct device *dev)
{
if (!dev->enabled)
return;
printk(BIOS_DEBUG, "Quanta EnE KB3940Q: Initializing keyboard.\n");
pc_keyboard_init(NO_AUX_DEVICE);
ene_kb3940q_log_events();
}
static struct device_operations ops = {
.init = ene_kb3940q_init,
.read_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
};
static struct pnp_info pnp_dev_info[] = {
{ NULL, 0, 0, 0, }
};
static void enable_dev(struct device *dev)
{
pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
}
struct chip_operations ec_quanta_ene_kb3940q_ops = {
CHIP_NAME("QUANTA EnE KB3940Q EC")
.enable_dev = enable_dev
};