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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/io.h>
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <device/pnp.h>
#include <pc80/keyboard.h>
#include "ec.h"
#include "chip.h"
/* helper functions from drivers/pc80/keyboard.c */
static int input_buffer_empty(u16 status_reg)
{
u32 timeout;
for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(status_reg) & KBD_IBF);
timeout--) {
udelay(1000);
}
if (!timeout) {
printk(BIOS_WARNING, "EC-IT8518 Unexpected input buffer full\n");
printk(BIOS_WARNING, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg));
}
return !!timeout;
}
static int output_buffer_full(u16 status_reg)
{
u32 timeout;
for (timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(status_reg)
& KBD_OBF) == 0); timeout--) {
udelay(1000);
}
if (!timeout) {
printk(BIOS_INFO, "EC-IT8518 output buffer result timeout\n");
printk(BIOS_INFO, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg));
}
return !!timeout;
}
/* The IT8518 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 nor
*/
u8 ec_kbc_read_ob(void)
{
if (!output_buffer_full(KBD_STATUS)) return 0;
return inb(KBD_DATA);
}
void ec_kbc_write_cmd(u8 cmd)
{
if (!input_buffer_empty(KBD_STATUS)) return;
outb(cmd, KBD_COMMAND);
}
void ec_kbc_write_ib(u8 data)
{
if (!input_buffer_empty(KBD_STATUS)) return;
outb(data, KBD_DATA);
}
/*
* These functions are for accessing the IT8518 device RAM space via 0x66/0x68
*/
u8 ec_read_ob(void)
{
if (!output_buffer_full(EC_SC)) return 0;
return inb(EC_DATA);
}
void ec_write_cmd(u8 cmd)
{
if (!input_buffer_empty(EC_SC)) return;
outb(cmd, EC_SC);
}
void ec_write_ib(u8 data)
{
if (!input_buffer_empty(EC_SC)) return;
outb(data, EC_DATA);
}
u8 ec_read(u16 addr)
{
ec_write_cmd(RD_EC);
ec_write_ib(addr);
return ec_read_ob();
}
void ec_write(u16 addr, u8 data)
{
ec_write_cmd(WR_EC);
ec_write_ib(addr);
ec_write_ib(data);
}
u8 ec_it8518_get_event(void)
{
u8 cmd = 0;
u8 status = inb(EC_SC);
if (status & SCI_EVT) {
ec_write_cmd(QR_EC);
cmd = ec_read_ob();
} else if (status & SMI_EVT) {
ec_kbc_write_cmd(EC_KBD_SMI_EVENT);
cmd = ec_kbc_read_ob();
}
return cmd;
}
void ec_it8518_enable_wake_events(void)
{
/*
* Set the bit in ECRAM that will enable the Lid switch as a wake source
*/
u8 reg8 = ec_read(EC_WAKE_SRC_ENABLE);
ec_write(EC_WAKE_SRC_ENABLE, reg8 | EC_LID_WAKE_ENABLE);
}
static void it8518_init(struct device *dev)
{
if (!dev->enabled)
return;
printk(BIOS_DEBUG, "Quanta IT8518: Initializing keyboard.\n");
pc_keyboard_init(NO_AUX_DEVICE);
}
static struct device_operations ops = {
.init = it8518_init,
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
};
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_it8518_ops = {
CHIP_NAME("QUANTA IT8518 EC")
.enable_dev = enable_dev
};
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