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/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
*
* 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/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/i2c.h>
#include <device/device.h>
#include <device/path.h>
#include <gpio.h>
#include <stdint.h>
#include <string.h>
#include "chip.h"
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
static void i2c_generic_add_power_res(struct drivers_i2c_generic_config *config)
{
const char *power_res_dev_states[] = { "_PR0", "_PR3" };
unsigned reset_gpio = config->reset_gpio.pins[0];
unsigned enable_gpio = config->enable_gpio.pins[0];
if (!config->has_power_resource)
return;
if (!reset_gpio && !enable_gpio)
return;
/* PowerResource (PRIC, 0, 0) */
acpigen_write_power_res("PRIC", 0, 0, power_res_dev_states,
ARRAY_SIZE(power_res_dev_states));
/* Method (_STA, 0, NotSerialized) { Return (0x1) } */
acpigen_write_STA(0x1);
/* Method (_ON, 0, Serialized) */
acpigen_write_method_serialized("_ON", 0);
if (reset_gpio)
acpigen_soc_set_tx_gpio(reset_gpio);
if (enable_gpio) {
acpigen_soc_set_tx_gpio(enable_gpio);
acpigen_write_sleep(config->enable_delay_ms);
}
if (reset_gpio) {
acpigen_soc_clear_tx_gpio(reset_gpio);
acpigen_write_sleep(config->reset_delay_ms);
}
acpigen_pop_len(); /* _ON method */
/* Method (_OFF, 0, Serialized) */
acpigen_write_method_serialized("_OFF", 0);
if (reset_gpio)
acpigen_soc_set_tx_gpio(reset_gpio);
if (enable_gpio)
acpigen_soc_clear_tx_gpio(enable_gpio);
acpigen_pop_len(); /* _OFF method */
acpigen_pop_len(); /* PowerResource PRIC */
}
static bool i2c_generic_add_gpios_to_crs(struct drivers_i2c_generic_config *cfg)
{
/*
* Return false if:
* 1. Request to explicitly disable export of GPIOs in CRS, or
* 2. Both reset and enable GPIOs are not provided.
*/
if (cfg->disable_gpio_export_in_crs ||
((cfg->reset_gpio.pin_count == 0) &&
(cfg->enable_gpio.pin_count == 0)))
return false;
return true;
}
static int i2c_generic_write_gpio(struct acpi_gpio *gpio, int *curr_index)
{
int ret = -1;
if (gpio->pin_count == 0)
return ret;
acpi_device_write_gpio(gpio);
ret = *curr_index;
(*curr_index)++;
return ret;
}
void i2c_generic_fill_ssdt(struct device *dev,
void (*callback)(struct device *dev),
struct drivers_i2c_generic_config *config)
{
const char *scope = acpi_device_scope(dev);
struct acpi_i2c i2c = {
.address = dev->path.i2c.device,
.mode_10bit = dev->path.i2c.mode_10bit,
.speed = config->speed ? : I2C_SPEED_FAST,
.resource = scope,
};
struct acpi_dp *dsd = NULL;
int curr_index = 0;
int reset_gpio_index = -1, enable_gpio_index = -1;
const char *path = acpi_device_path(dev);
if (!dev->enabled || !scope)
return;
if (!config->hid) {
printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev));
return;
}
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", config->hid);
if (config->cid)
acpigen_write_name_string("_CID", config->cid);
acpigen_write_name_integer("_UID", config->uid);
acpigen_write_name_string("_DDN", config->desc);
acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_i2c(&i2c);
acpi_device_write_interrupt(&config->irq);
if (i2c_generic_add_gpios_to_crs(config) == true) {
reset_gpio_index = i2c_generic_write_gpio(&config->reset_gpio,
&curr_index);
enable_gpio_index = i2c_generic_write_gpio(&config->enable_gpio,
&curr_index);
}
acpigen_write_resourcetemplate_footer();
/* Wake capabilities */
if (config->wake) {
acpigen_write_name_integer("_S0W", 4);
acpigen_write_PRW(config->wake, 3);
}
/* DSD */
if (config->probed || (reset_gpio_index != -1) ||
(enable_gpio_index != -1)) {
dsd = acpi_dp_new_table("_DSD");
if (config->probed)
acpi_dp_add_integer(dsd, "linux,probed", 1);
if (reset_gpio_index != -1)
acpi_dp_add_gpio(dsd, "reset-gpios", path,
reset_gpio_index, 0,
config->reset_gpio.polarity);
if (enable_gpio_index != -1)
acpi_dp_add_gpio(dsd, "enable-gpios", path,
enable_gpio_index, 0,
config->enable_gpio.polarity);
acpi_dp_write(dsd);
}
/* Power Resource */
i2c_generic_add_power_res(config);
/* Callback if any. */
if (callback)
callback(dev);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", path,
config->desc ? : dev->chip_ops->name, dev_path(dev));
}
static void i2c_generic_fill_ssdt_generator(struct device *dev)
{
i2c_generic_fill_ssdt(dev, NULL, dev->chip_info);
}
/* Use name specified in config or build one from I2C address */
static const char *i2c_generic_acpi_name(struct device *dev)
{
struct drivers_i2c_generic_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
name[4] = '\0';
return name;
}
#endif
static struct device_operations i2c_generic_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
.acpi_name = &i2c_generic_acpi_name,
.acpi_fill_ssdt_generator = &i2c_generic_fill_ssdt_generator,
#endif
};
static void i2c_generic_enable(struct device *dev)
{
struct drivers_i2c_generic_config *config = dev->chip_info;
/* Check if device is present by reading GPIO */
if (config->device_present_gpio) {
int present = gpio_get(config->device_present_gpio);
present ^= config->device_present_gpio_invert;
printk(BIOS_INFO, "%s is %spresent\n",
dev->chip_ops->name, present ? "" : "not ");
if (!present) {
dev->enabled = 0;
return;
}
}
dev->ops = &i2c_generic_ops;
}
struct chip_operations drivers_i2c_generic_ops = {
CHIP_NAME("I2C Device")
.enable_dev = &i2c_generic_enable
};
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