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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file is part of the coreboot project. */
#include <stdlib.h>
#include <console/console.h>
#include <device/pnp.h>
#include <device/device.h>
#include <superio/conf_mode.h>
#include "nct5104d.h"
#include "chip.h"
static void set_irq_trigger_type(struct device *dev, bool trig_level)
{
u8 reg10, reg11, reg26;
//Before accessing CR10 OR CR11 Bit 4 in CR26 must be set to 1
reg26 = pnp_read_config(dev, GLOBAL_OPTION_CR26);
reg26 |= CR26_LOCK_REG;
pnp_write_config(dev, GLOBAL_OPTION_CR26, reg26);
switch (dev->path.pnp.device) {
//SP1 (UARTA) IRQ type selection (1:level,0:edge) is controlled by CR 10, bit 5
case NCT5104D_SP1:
reg10 = pnp_read_config(dev, IRQ_TYPE_SEL_CR10);
if (trig_level)
reg10 |= (1 << 5);
else
reg10 &= ~(1 << 5);
pnp_write_config(dev, IRQ_TYPE_SEL_CR10, reg10);
break;
//SP2 (UARTB) IRQ type selection (1:level,0:edge) is controlled by CR 10, bit 4
case NCT5104D_SP2:
reg10 = pnp_read_config(dev, IRQ_TYPE_SEL_CR10);
if (trig_level)
reg10 |= (1 << 4);
else
reg10 &= ~(1 << 4);
pnp_write_config(dev, IRQ_TYPE_SEL_CR10, reg10);
break;
//SP3 (UARTC) IRQ type selection (1:level,0:edge) is controlled by CR 11, bit 5
case NCT5104D_SP3:
reg11 = pnp_read_config(dev,IRQ_TYPE_SEL_CR11);
if (trig_level)
reg11 |= (1 << 5);
else
reg11 &= ~(1 << 5);
pnp_write_config(dev, IRQ_TYPE_SEL_CR11, reg11);
break;
//SP4 (UARTD) IRQ type selection (1:level,0:edge) is controlled by CR 11, bit 4
case NCT5104D_SP4:
reg11 = pnp_read_config(dev,IRQ_TYPE_SEL_CR11);
if (trig_level)
reg11 |= (1 << 4);
else
reg11 &= ~(1 << 4);
pnp_write_config(dev, IRQ_TYPE_SEL_CR11, reg11);
break;
default:
break;
}
//Clear access control register
reg26 = pnp_read_config(dev, GLOBAL_OPTION_CR26);
reg26 &= ~CR26_LOCK_REG;
pnp_write_config(dev, GLOBAL_OPTION_CR26, reg26);
}
static void route_pins_to_uart(struct device *dev, bool to_uart)
{
u8 reg;
reg = pnp_read_config(dev, 0x1c);
switch (dev->path.pnp.device) {
case NCT5104D_SP3:
case NCT5104D_GPIO0:
/* Route pins 33 - 40. */
if (to_uart)
reg |= (1 << 3);
else
reg &= ~(1 << 3);
break;
case NCT5104D_SP4:
case NCT5104D_GPIO1:
/* Route pins 41 - 48. */
if (to_uart)
reg |= (1 << 2);
else
reg &= ~(1 << 2);
break;
default:
break;
}
pnp_write_config(dev, 0x1c, reg);
}
static void reset_gpio_default_in(struct device *dev)
{
pnp_set_logical_device(dev);
/*
* Soft reset GPIOs to default state: IN.
* The main GPIO LDN holds registers that configure the pins as output
* or input. These registers are located at offset 0xE0 plus the GPIO
* bank number multiplied by 4: 0xE0 for GPIO0, 0xE4 for GPIO1 and
* 0xF8 for GPIO6.
*/
pnp_write_config(dev, NCT5104D_GPIO0_IO + (dev->path.pnp.device >> 8) * 4, 0xFF);
}
static void reset_gpio_default_od(struct device *dev)
{
struct device *gpio0, *gpio1, *gpio6;
pnp_set_logical_device(dev);
gpio0 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO0);
gpio1 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO1);
gpio6 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO6);
/*
* Soft reset GPIOs to default state: Open-drain.
* The NCT5104D_GPIO_PP_OD LDN holds registers (1 for each GPIO bank)
* that configure each GPIO pin to be open dain or push pull. System
* reset is known to not reset the values in this register. The
* registers are located at offsets begginign from 0xE0 plus GPIO bank
* number, i.e. 0xE0 for GPIO0, 0xE1 for GPIO1 and 0xE6 for GPIO6.
*/
if (gpio0 && gpio0->enabled)
pnp_write_config(dev,
(gpio0->path.pnp.device >> 8) + NCT5104D_GPIO0_PP_OD, 0xFF);
if (gpio1 && gpio1->enabled)
pnp_write_config(dev,
(gpio1->path.pnp.device >> 8) + NCT5104D_GPIO0_PP_OD, 0xFF);
if (gpio6 && gpio6->enabled)
pnp_write_config(dev,
(gpio6->path.pnp.device >> 8) + NCT5104D_GPIO0_PP_OD, 0xFF);
}
static void disable_gpio_io_port(struct device *dev)
{
struct device *gpio0, *gpio1, *gpio6;
/*
* Since UARTC and UARTD share pins with GPIO0 and GPIO1 and the
* GPIO/UART can be selected via Kconfig, check whether at least one of
* GPIOs is enabled and if yes keep the GPIO IO VLDN enabled. If no
* GPIOs are enabled, disable the VLDN in order to protect from invalid
* devicetree + Kconfig settings.
*/
gpio0 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO0);
gpio1 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO1);
gpio6 = dev_find_slot_pnp(dev->path.pnp.port, NCT5104D_GPIO6);
if (!((gpio0 && gpio0->enabled) || (gpio1 && gpio1->enabled) ||
(gpio6 && gpio6->enabled))) {
dev->enabled = 0;
printk(BIOS_WARNING, "WARNING: GPIO IO port configured,"
" but no GPIO enabled. Disabling...");
}
}
static void nct5104d_init(struct device *dev)
{
struct superio_nuvoton_nct5104d_config *conf = dev->chip_info;
if (!dev->enabled)
return;
pnp_enter_conf_mode(dev);
switch (dev->path.pnp.device) {
case NCT5104D_SP1:
case NCT5104D_SP2:
set_irq_trigger_type(dev, conf->irq_trigger_type != 0);
break;
case NCT5104D_SP3:
case NCT5104D_SP4:
route_pins_to_uart(dev, true);
set_irq_trigger_type(dev, conf->irq_trigger_type != 0);
break;
case NCT5104D_GPIO0:
case NCT5104D_GPIO1:
route_pins_to_uart(dev, false);
/* FALLTHROUGH */
case NCT5104D_GPIO6:
if (conf->reset_gpios)
reset_gpio_default_in(dev);
break;
case NCT5104D_GPIO_PP_OD:
if (conf->reset_gpios)
reset_gpio_default_od(dev);
break;
case NCT5104D_GPIO_IO:
disable_gpio_io_port(dev);
break;
default:
break;
}
pnp_exit_conf_mode(dev);
}
static struct device_operations ops = {
.read_resources = pnp_read_resources,
.set_resources = pnp_set_resources,
.enable_resources = pnp_enable_resources,
.enable = pnp_alt_enable,
.init = nct5104d_init,
.ops_pnp_mode = &pnp_conf_mode_8787_aa,
};
static struct pnp_info pnp_dev_info[] = {
{ NULL, NCT5104D_FDC, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, NCT5104D_SP1, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, NCT5104D_SP2, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, NCT5104D_SP3, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, NCT5104D_SP4, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, NCT5104D_GPIO_WDT},
{ NULL, NCT5104D_GPIO0},
{ NULL, NCT5104D_GPIO1},
{ NULL, NCT5104D_GPIO6},
{ NULL, NCT5104D_GPIO_PP_OD},
{ NULL, NCT5104D_GPIO_IO, PNP_IO0, 0x07f8, },
{ NULL, NCT5104D_PORT80},
};
static void enable_dev(struct device *dev)
{
pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
}
struct chip_operations superio_nuvoton_nct5104d_ops = {
CHIP_NAME("Nuvoton NCT5104D Super I/O")
.enable_dev = enable_dev,
};
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