staging: fsl-mc: Added generic MSI support for FSL-MC devices

Created an MSI domain for the fsl-mc bus-- including functions
to create a domain, find a domain, alloc/free domain irqs, and
bus specific overrides for domain and irq_chip ops.

Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 35 insertions, 1 deletions

diff --git a/drivers/staging/fsl-mc/include/dprc.h b/drivers/staging/fsl-mc/include/dprc.h
index c3152f677ff1..94c492706315 100644
--- a/drivers/staging/fsl-mc/include/dprc.h
+++ b/drivers/staging/fsl-mc/include/dprc.h
@@ -176,7 +176,7 @@ int dprc_reset_container(struct fsl_mc_io *mc_io,
  * @user_irq_id: A user defined number associated with this IRQ
  */
 struct dprc_irq_cfg {
-	     u64		paddr;
+	     phys_addr_t	paddr;
 	     u32		val;
 	     int		user_irq_id;
 };
diff --git a/drivers/staging/fsl-mc/include/mc-private.h b/drivers/staging/fsl-mc/include/mc-private.h
index c706f778626e..36b418c23fd7 100644
--- a/drivers/staging/fsl-mc/include/mc-private.h
+++ b/drivers/staging/fsl-mc/include/mc-private.h
@@ -26,6 +26,9 @@
 	 strcmp(_obj_type, "dpmcp") == 0 || \
 	 strcmp(_obj_type, "dpcon") == 0)
 
+struct irq_domain;
+struct msi_domain_info;
+
 /**
  * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
  * @root_mc_bus_dev: MC object device representing the root DPRC
@@ -79,11 +82,13 @@ struct fsl_mc_resource_pool {
  * @resource_pools: array of resource pools (one pool per resource type)
  * for this MC bus. These resources represent allocatable entities
  * from the physical DPRC.
+ * @irq_resources: Pointer to array of IRQ objects for the IRQ pool
  * @scan_mutex: Serializes bus scanning
  */
 struct fsl_mc_bus {
 	struct fsl_mc_device mc_dev;
 	struct fsl_mc_resource_pool resource_pools[FSL_MC_NUM_POOL_TYPES];
+	struct fsl_mc_device_irq *irq_resources;
 	struct mutex scan_mutex;    /* serializes bus scanning */
 };
 
@@ -116,4 +121,16 @@ int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus,
 
 void fsl_mc_resource_free(struct fsl_mc_resource *resource);
 
+struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
+						struct msi_domain_info *info,
+						struct irq_domain *parent);
+
+int fsl_mc_find_msi_domain(struct device *mc_platform_dev,
+			   struct irq_domain **mc_msi_domain);
+
+int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
+				 unsigned int irq_count);
+
+void fsl_mc_msi_domain_free_irqs(struct device *dev);
+
 #endif /* _FSL_MC_PRIVATE_H_ */
diff --git a/drivers/staging/fsl-mc/include/mc.h b/drivers/staging/fsl-mc/include/mc.h
index a933291e400a..1c1d6ae64996 100644
--- a/drivers/staging/fsl-mc/include/mc.h
+++ b/drivers/staging/fsl-mc/include/mc.h
@@ -104,6 +104,23 @@ struct fsl_mc_resource {
 };
 
 /**
+ * struct fsl_mc_device_irq - MC object device message-based interrupt
+ * @msi_desc: pointer to MSI descriptor allocated by fsl_mc_msi_alloc_descs()
+ * @mc_dev: MC object device that owns this interrupt
+ * @dev_irq_index: device-relative IRQ index
+ * @resource: MC generic resource associated with the interrupt
+ */
+struct fsl_mc_device_irq {
+	struct msi_desc *msi_desc;
+	struct fsl_mc_device *mc_dev;
+	u8 dev_irq_index;
+	struct fsl_mc_resource resource;
+};
+
+#define to_fsl_mc_irq(_mc_resource) \
+	container_of(_mc_resource, struct fsl_mc_device_irq, resource)
+
+/**
  * Bit masks for a MC object device (struct fsl_mc_device) flags
  */
 #define FSL_MC_IS_DPRC	0x0001