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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file is part of the coreboot project. */
#include <arch/io.h>
#include <device/pnp_ops.h>
#include <device/pnp.h>
#include <stdint.h>
#include "ite.h"
/* Global configuration registers. */
#define ITE_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */
#define ITE_CONFIG_REG_LDN 0x07 /* Logical Device Number. */
#define ITE_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */
#define ITE_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */
#define ITE_CONFIG_REG_MFC 0x2a /* multi function pin */
#define ITE_CONFIG_REG_WATCHDOG 0x72 /* watchdog config */
/* Helper procedure */
static void ite_sio_write(pnp_devfn_t dev, u8 reg, u8 value)
{
pnp_set_logical_device(dev);
pnp_write_config(dev, reg, value);
}
/* Enable configuration */
void pnp_enter_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(0x87, port);
outb(0x01, port);
outb(0x55, port);
outb((port == 0x4e) ? 0xaa : 0x55, port);
}
/* Disable configuration */
void pnp_exit_conf_state(pnp_devfn_t dev)
{
ite_sio_write(dev, ITE_CONFIG_REG_CC, 0x02);
}
void ite_reg_write(pnp_devfn_t dev, u8 reg, u8 value)
{
pnp_enter_conf_state(dev);
ite_sio_write(dev, reg, value);
pnp_exit_conf_state(dev);
}
/*
* in romstage.c
* #define CLKIN_DEV PNP_DEV(0x2e, ITE_GPIO)
* and pass: CLKIN_DEV
* ITE_UART_CLK_PREDIVIDE_24
* ITE_UART_CLK_PREDIVIDE_48 (default)
*/
void ite_conf_clkin(pnp_devfn_t dev, u8 predivide)
{
ite_reg_write(dev, ITE_CONFIG_REG_CLOCKSEL, (0x1 & predivide));
}
/* Bring up early serial debugging output before the RAM is initialized. */
void ite_enable_serial(pnp_devfn_t dev, u16 iobase)
{
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 0);
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}
/*
*
* LDN 7, reg 0x2a - needed for S3, or memory power will be cut off
* this was documented only in IT8712F_V0.9.2!
*
* Enable 3VSBSW#. (For System Suspend-to-RAM)
* 0: 3VSBSW# will be always inactive.
* 1: 3VSBSW# enabled. It will be (NOT SUSB#) NAND SUSC#.
*
* in romstage.c
* #define GPIO_DEV PNP_DEV(0x2e, ITE_GPIO)
* and pass: GPIO_DEV
*/
void ite_enable_3vsbsw(pnp_devfn_t dev)
{
u8 tmp;
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
tmp = pnp_read_config(dev, ITE_CONFIG_REG_MFC);
tmp |= 0x80;
pnp_write_config(dev, ITE_CONFIG_REG_MFC, tmp);
pnp_exit_conf_state(dev);
}
/*
* in romstage.c
* #define GPIO_DEV PNP_DEV(0x2e, ITE_GPIO)
* and pass: GPIO_DEV
*/
void ite_kill_watchdog(pnp_devfn_t dev)
{
pnp_enter_conf_state(dev);
ite_sio_write(dev, ITE_CONFIG_REG_WATCHDOG, 0x00);
pnp_exit_conf_state(dev);
}
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