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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
/* Pre-RAM driver for SMSC LPC47N227 Super I/O chip. */
#include <arch/io.h>
#include <assert.h>
#include <device/pnp_ops.h>
#include "lpc47n227.h"
void pnp_enter_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(0x55, port);
}
void pnp_exit_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(0xaa, port);
}
/**
* Program the base I/O port for the specified logical device.
*
* @param dev High 8 bits = Super I/O port, low 8 bits = logical device number.
* @param iobase Base I/O port for the logical device.
*/
static void lpc47n227_pnp_set_iobase(pnp_devfn_t dev, u16 iobase)
{
/* LPC47N227 requires base ports to be a multiple of 4. */
/* it's not very useful to do an ASSERT here: if it trips,
* there's no console to report it.
ASSERT(!(iobase & 0x3));
*/
switch (dev & 0xFF) {
case LPC47N227_PP:
pnp_write_config(dev, 0x23, (iobase >> 2) & 0xff);
break;
case LPC47N227_SP1:
pnp_write_config(dev, 0x24, (iobase >> 2) & 0xff);
break;
case LPC47N227_SP2:
pnp_write_config(dev, 0x25, (iobase >> 2) & 0xff);
break;
default:
break;
}
}
/**
* Enable or disable the specified logical device.
*
* Technically, a full disable requires setting the device's base I/O port
* below 0x100. We don't do that here, because we don't have access to a data
* structure that specifies what the 'real' base port is (when asked to enable
* the device). Also the function is used only to disable the device while its
* true base port is programmed (see lpc47n227_enable_serial() below).
*
* @param dev High 8 bits = Super I/O port, low 8 bits = logical device number.
* @param enable 0 to disable, anything else to enable.
*/
static void lpc47n227_pnp_set_enable(pnp_devfn_t dev, int enable)
{
u8 power_register = 0, power_mask = 0, current_power, new_power;
switch (dev & 0xFF) {
case LPC47N227_PP:
power_register = 0x01;
power_mask = 0x04;
break;
case LPC47N227_SP1:
power_register = 0x02;
power_mask = 0x08;
break;
case LPC47N227_SP2:
power_register = 0x02;
power_mask = 0x80;
break;
default:
return;
}
current_power = pnp_read_config(dev, power_register);
new_power = current_power & ~power_mask; /* Disable by default. */
if (enable)
new_power |= power_mask; /* Enable. */
pnp_write_config(dev, power_register, new_power);
}
/**
* Configure the base I/O port of the specified serial device and enable the
* serial device.
*
* @param dev High 8 bits = Super I/O port, low 8 bits = logical device number.
* @param iobase Processor I/O port address to assign to this serial device.
*/
void lpc47n227_enable_serial(pnp_devfn_t dev, u16 iobase)
{
/*
* NOTE: Cannot use pnp_set_XXX() here because they assume chip
* support for logical devices, which the LPC47N227 doesn't have.
*/
pnp_enter_conf_state(dev);
lpc47n227_pnp_set_enable(dev, 0);
lpc47n227_pnp_set_iobase(dev, iobase);
lpc47n227_pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}
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