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/*
* This file is part of the coreboot project.
*
* Copyright 2017 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/device.h>
#include <device/path.h>
#include <device/spi.h>
#include <spi-generic.h>
#include <stdint.h>
#include <string.h>
#include "chip.h"
static int spi_acpi_get_bus(struct device *dev)
{
struct device *spi_dev;
struct device_operations *ops;
if (!dev->bus || !dev->bus->dev)
return -1;
spi_dev = dev->bus->dev;
ops = spi_dev->ops;
if (ops && ops->ops_spi_bus &&
ops->ops_spi_bus->dev_to_bus)
return ops->ops_spi_bus->dev_to_bus(spi_dev);
return -1;
}
static void spi_acpi_fill_ssdt_generator(struct device *dev)
{
struct drivers_spi_acpi_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
struct spi_cfg spi_cfg;
struct spi_slave slave;
int bus = -1, cs = dev->path.spi.cs;
struct acpi_spi spi = {
.device_select = cs,
.speed = config->speed ? : 1 * MHz,
.resource = scope,
};
if (!dev->enabled || !scope)
return;
bus = spi_acpi_get_bus(dev);
if (bus == -1) {
printk(BIOS_ERR, "%s: ERROR: Cannot get bus for device.\n",
dev_path(dev));
return;
}
if (!config->hid) {
printk(BIOS_ERR, "%s: ERROR: HID required.\n", dev_path(dev));
return;
}
if (spi_setup_slave(bus, cs, &slave)) {
printk(BIOS_ERR, "%s: ERROR: SPI setup failed.\n",
dev_path(dev));
return;
}
if (spi_get_config(&slave, &spi_cfg)) {
printk(BIOS_ERR, "%s: ERROR: SPI get config failed.\n",
dev_path(dev));
return;
}
spi.device_select_polarity = spi_cfg.cs_polarity;
spi.wire_mode = spi_cfg.wire_mode;
spi.data_bit_length = spi_cfg.data_bit_length;
spi.clock_phase = spi_cfg.clk_phase;
/* 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);
if (config->desc)
acpigen_write_name_string("_DDN", config->desc);
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_spi(&spi);
acpi_device_write_interrupt(&config->irq);
acpigen_write_resourcetemplate_footer();
if (config->compat_string) {
struct acpi_dp *dsd = acpi_dp_new_table("_DSD");
acpi_dp_add_string(dsd, "compatible", config->compat_string);
acpi_dp_write(dsd);
}
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *spi_acpi_name(struct device *dev)
{
struct drivers_spi_acpi_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "S%03.3X", spi_acpi_get_bus(dev));
name[4] = '\0';
return name;
}
static struct device_operations spi_acpi_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.acpi_name = &spi_acpi_name,
.acpi_fill_ssdt_generator = &spi_acpi_fill_ssdt_generator,
};
static void spi_acpi_enable(struct device *dev)
{
dev->ops = &spi_acpi_ops;
}
struct chip_operations drivers_spi_acpi_ops = {
CHIP_NAME("SPI Device")
.enable_dev = &spi_acpi_enable
};
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