[PATCH 2/2] soundwire: bus: Allow SoundWire peripherals to register IRQ handlers

[Charles Keepax]

From: Lucas Tanure <tanureal at opensource.cirrus.com>

Allow SoundWire peripherals to register a normal IRQ handler to receive
SoundWire alerts. This allows sharing the IRQ code between I2C/SPI which
typically use a normal IRQ handler, and SoundWire which historically
used a callback.

Signed-off-by: Lucas Tanure <tanureal at opensource.cirrus.com>
Signed-off-by: Charles Keepax <ckeepax at opensource.cirrus.com>
---
 drivers/soundwire/bus.c       | 39 +++++++++++++++++++++++++++++++++++
 include/linux/soundwire/sdw.h |  9 ++++++++
 2 files changed, 48 insertions(+)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index daee2cca94a4d..49087e0ca3c3c 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -3,6 +3,7 @@
 
 #include <linux/acpi.h>
 #include <linux/delay.h>
+#include <linux/irq.h>
 #include <linux/mod_devicetable.h>
 #include <linux/pm_runtime.h>
 #include <linux/soundwire/sdw_registers.h>
@@ -25,6 +26,23 @@ static int sdw_get_id(struct sdw_bus *bus)
 	return 0;
 }
 
+static int sdw_irq_map(struct irq_domain *h, unsigned int virq,
+		       irq_hw_number_t hw)
+{
+	struct sdw_bus *bus = h->host_data;
+
+	irq_set_chip_data(virq, bus);
+	irq_set_chip(virq, &bus->irq_chip);
+	irq_set_nested_thread(virq, 1);
+	irq_set_noprobe(virq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops sdw_domain_ops = {
+	.map	= sdw_irq_map,
+};
+
 /**
  * sdw_bus_master_add() - add a bus Master instance
  * @bus: bus instance
@@ -142,6 +160,13 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
 	bus->params.curr_bank = SDW_BANK0;
 	bus->params.next_bank = SDW_BANK1;
 
+	bus->irq_chip.name = dev_name(bus->dev);
+	bus->domain = irq_domain_add_linear(NULL, SDW_MAX_DEVICES, &sdw_domain_ops, bus);
+	if (!bus->domain) {
+		dev_err(bus->dev, "Failed to add IRQ domain\n");
+		return -EINVAL;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL(sdw_bus_master_add);
@@ -158,6 +183,8 @@ static int sdw_delete_slave(struct device *dev, void *data)
 	mutex_lock(&bus->bus_lock);
 
 	if (slave->dev_num) { /* clear dev_num if assigned */
+		irq_dispose_mapping(irq_find_mapping(bus->domain, slave->dev_num));
+
 		clear_bit(slave->dev_num, bus->assigned);
 		if (bus->dev_num_ida_min)
 			ida_free(&sdw_peripheral_ida, slave->dev_num);
@@ -178,6 +205,9 @@ static int sdw_delete_slave(struct device *dev, void *data)
 void sdw_bus_master_delete(struct sdw_bus *bus)
 {
 	device_for_each_child(bus->dev, NULL, sdw_delete_slave);
+
+	irq_domain_remove(bus->domain);
+
 	sdw_master_device_del(bus);
 
 	sdw_bus_debugfs_exit(bus);
@@ -717,6 +747,12 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
 			slave->dev_num = dev_num;
 			slave->dev_num_sticky = dev_num;
 			new_device = true;
+
+			slave->irq = irq_create_mapping(bus->domain, dev_num);
+			if (!slave->irq) {
+				dev_err(bus->dev, "Failed to map IRQ\n");
+				return -EINVAL;
+			}
 		} else {
 			slave->dev_num = slave->dev_num_sticky;
 		}
@@ -1682,6 +1718,9 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
 				struct device *dev = &slave->dev;
 				struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 
+				if (slave->prop.irq && slave->irq)
+					handle_nested_irq(slave->irq);
+
 				if (drv->ops && drv->ops->interrupt_callback) {
 					slave_intr.sdca_cascade = sdca_cascade;
 					slave_intr.control_port = clear;
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 3cd2a761911ff..7627c459ab20f 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -5,6 +5,8 @@
 #define __SOUNDWIRE_H
 
 #include <linux/bug.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/mod_devicetable.h>
 #include <linux/bitfield.h>
 
@@ -369,6 +371,7 @@ struct sdw_dpn_prop {
  * @clock_reg_supported: the Peripheral implements the clock base and scale
  * registers introduced with the SoundWire 1.2 specification. SDCA devices
  * do not need to set this boolean property as the registers are required.
+ * @irq: call actual IRQ handler on slave, as well as callback
  */
 struct sdw_slave_prop {
 	u32 mipi_revision;
@@ -393,6 +396,7 @@ struct sdw_slave_prop {
 	u8 scp_int1_mask;
 	u32 quirks;
 	bool clock_reg_supported;
+	bool irq;
 };
 
 #define SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY	BIT(0)
@@ -638,6 +642,7 @@ struct sdw_slave_ops {
  * struct sdw_slave - SoundWire Slave
  * @id: MIPI device ID
  * @dev: Linux device
+ * @irq: IRQ number
  * @status: Status reported by the Slave
  * @bus: Bus handle
  * @prop: Slave properties
@@ -667,6 +672,7 @@ struct sdw_slave_ops {
 struct sdw_slave {
 	struct sdw_slave_id id;
 	struct device dev;
+	int irq;
 	enum sdw_slave_status status;
 	struct sdw_bus *bus;
 	struct sdw_slave_prop prop;
@@ -884,6 +890,7 @@ struct sdw_master_ops {
  * is used to compute and program bus bandwidth, clock, frame shape,
  * transport and port parameters
  * @debugfs: Bus debugfs
+ * @domain: IRQ domain
  * @defer_msg: Defer message
  * @clk_stop_timeout: Clock stop timeout computed
  * @bank_switch_timeout: Bank switch timeout computed
@@ -917,6 +924,8 @@ struct sdw_bus {
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
 #endif
+	struct irq_chip irq_chip;
+	struct irq_domain *domain;
 	struct sdw_defer defer_msg;
 	unsigned int clk_stop_timeout;
 	u32 bank_switch_timeout;
-- 
2.30.2