2 files changed, 103 insertions, 4 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)
diff --git a/src/drivers/spi/acpi/chip.h b/src/drivers/spi/acpi/chip.h
index f0cc9417cb..6b54100536 100644
--- a/src/drivers/spi/acpi/chip.h
+++ b/src/drivers/spi/acpi/chip.h
@@ -24,9 +24,29 @@ struct drivers_spi_acpi_config {
 	const char *name;		/* ACPI Device Name */
 	const char *desc;		/* Device Description */
 	unsigned uid;			/* ACPI _UID */
-	unsigned speed;		/* Bus speed in Hz (default 1MHz) */
+	unsigned speed;			/* Bus speed in Hz (default 1MHz) */
 	const char *compat_string;	/* Compatible string for _HID=PRP0001 */
 	struct acpi_irq irq;		/* Interrupt */
+	unsigned wake;			/* Wake GPE */
+
+	/* Use GPIO based interrupt instead of PIRQ */
+	struct acpi_gpio irq_gpio;
+
+	/* Disable reset and enable GPIO export in _CRS */
+	bool disable_gpio_export_in_crs;
+
+	/* Does the device have a power resource? */
+	bool has_power_resource;
+
+	/* GPIO used to take device out of reset or to put it into reset. */
+	struct acpi_gpio reset_gpio;
+	/* Delay to be inserted after device is taken out of reset. */
+	unsigned reset_delay_ms;
+
+	/* GPIO used to enable device. */
+	struct acpi_gpio enable_gpio;
+	/* Delay to be inserted after device is enabled. */
+	unsigned enable_delay_ms;
 };
 
 #endif /* __SPI_ACPI_CHIP_H__ */