| /* |
| * 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 |
| }; |