diff options
Diffstat (limited to 'src/drivers/spi/acpi/acpi.c')
-rw-r--r-- | src/drivers/spi/acpi/acpi.c | 85 |
1 files changed, 82 insertions, 3 deletions
diff --git a/src/drivers/spi/acpi/acpi.c b/src/drivers/spi/acpi/acpi.c index 0d7d2aa429..028a37c20d 100644 --- a/src/drivers/spi/acpi/acpi.c +++ b/src/drivers/spi/acpi/acpi.c @@ -42,10 +42,40 @@ static int spi_acpi_get_bus(struct device *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(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 spi_cfg spi_cfg; struct spi_slave slave; int bus = -1, cs = dev->path.spi.cs; @@ -54,6 +84,10 @@ static void spi_acpi_fill_ssdt_generator(struct device *dev) .speed = config->speed ? : 1 * MHz, .resource = scope, }; + int curr_index = 0; + int irq_gpio_index = -1; + int reset_gpio_index = -1; + int enable_gpio_index = -1; if (!dev->enabled || !scope) return; @@ -101,17 +135,62 @@ static void spi_acpi_fill_ssdt_generator(struct device *dev) acpigen_write_name("_CRS"); acpigen_write_resourcetemplate_header(); acpi_device_write_spi(&spi); - acpi_device_write_interrupt(&config->irq); + + /* 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(); - if (config->compat_string) { + /* Wake capabilities */ + if (config->wake) { + acpigen_write_name_integer("_S0W", 4); + 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"); - acpi_dp_add_string(dsd, "compatible", config->compat_string); + 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.polarity); + if (reset_gpio_index >= 0) + acpi_dp_add_gpio(dsd, "reset-gpios", path, + reset_gpio_index, 0, + config->reset_gpio.polarity); + if (enable_gpio_index >= 0) + acpi_dp_add_gpio(dsd, "enable-gpios", path, + enable_gpio_index, 0, + config->enable_gpio.polarity); acpi_dp_write(dsd); } + /* Power Resource */ + if (config->has_power_resource) + acpi_device_add_power_res( + &config->reset_gpio, config->reset_delay_ms, + &config->enable_gpio, config->enable_delay_ms); + 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(struct device *dev) |