/* SPDX-License-Identifier: GPL-2.0-only */ #include <acpi/acpi_device.h> #include <acpi/acpigen.h> #include <console/console.h> #include <device/device.h> #include <device/path.h> #include <device/spi.h> #include <spi-generic.h> #include <string.h> #include "chip.h" static int spi_acpi_get_bus(const 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 bool spi_acpi_add_gpios_to_crs(struct drivers_spi_acpi_config *config) { /* * Return false if: * 1. Request to explicitly disable export of GPIOs in CRS, or * 2. Both reset and enable GPIOs are not provided. */ if (config->disable_gpio_export_in_crs || ((config->reset_gpio.pin_count == 0) && (config->enable_gpio.pin_count == 0))) return false; return true; } static int spi_acpi_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; } static void spi_acpi_fill_ssdt_generator(const struct device *dev) { struct drivers_spi_acpi_config *config = dev->chip_info; const char *scope = acpi_device_scope(dev); const char *path = acpi_device_path(dev); struct acpi_spi spi = { .device_select = dev->path.spi.cs, .speed = config->speed ? : 1 * MHz, .resource = scope, .device_select_polarity = SPI_POLARITY_LOW, .wire_mode = SPI_4_WIRE_MODE, .data_bit_length = 8, .clock_phase = SPI_CLOCK_PHASE_FIRST, .clock_polarity = SPI_POLARITY_LOW, }; int curr_index = 0; int irq_gpio_index = -1; int reset_gpio_index = -1; int enable_gpio_index = -1; if (!scope) return; if (spi_acpi_get_bus(dev) == -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; } /* 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); acpigen_write_STA(acpi_device_status(dev)); /* Resources */ acpigen_write_name("_CRS"); acpigen_write_resourcetemplate_header(); acpi_device_write_spi(&spi); /* Use either Interrupt() or GpioInt() */ if (config->irq_gpio.pin_count) irq_gpio_index = spi_acpi_write_gpio(&config->irq_gpio, &curr_index); else acpi_device_write_interrupt(&config->irq); /* Add enable/reset GPIOs if needed */ if (spi_acpi_add_gpios_to_crs(config)) { reset_gpio_index = spi_acpi_write_gpio(&config->reset_gpio, &curr_index); enable_gpio_index = spi_acpi_write_gpio(&config->enable_gpio, &curr_index); } acpigen_write_resourcetemplate_footer(); /* Wake capabilities */ if (config->wake) { acpigen_write_name_integer("_S0W", ACPI_DEVICE_SLEEP_D3_HOT); acpigen_write_PRW(config->wake, 3); }; /* Write device properties if needed */ if (config->compat_string || irq_gpio_index >= 0 || reset_gpio_index >= 0 || enable_gpio_index >= 0) { struct acpi_dp *dsd = acpi_dp_new_table("_DSD"); if (config->compat_string) acpi_dp_add_string(dsd, "compatible", config->compat_string); if (irq_gpio_index >= 0) acpi_dp_add_gpio(dsd, "irq-gpios", path, irq_gpio_index, 0, config->irq_gpio.active_low); if (reset_gpio_index >= 0) acpi_dp_add_gpio(dsd, "reset-gpios", path, reset_gpio_index, 0, config->reset_gpio.active_low); if (enable_gpio_index >= 0) acpi_dp_add_gpio(dsd, "enable-gpios", path, enable_gpio_index, 0, config->enable_gpio.active_low); acpi_dp_write(dsd); } /* Power Resource */ if (config->has_power_resource) { const struct acpi_power_res_params power_res_params = { &config->reset_gpio, config->reset_delay_ms, config->reset_off_delay_ms, &config->enable_gpio, config->enable_delay_ms, config->enable_off_delay_ms, &config->stop_gpio, config->stop_delay_ms, config->stop_off_delay_ms }; acpi_device_add_power_res(&power_res_params); } 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 const char *spi_acpi_name(const 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 = noop_read_resources, .set_resources = noop_set_resources, .acpi_name = spi_acpi_name, .acpi_fill_ssdt = 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 };