rapidio: add inbound memory mapping interface

[pandora-kernel.git] / drivers / rapidio / rio.c

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index c40665a..d7b68cc 100644 (file)
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -33,6 +33,7 @@
 
 static LIST_HEAD(rio_mports);
 static unsigned char next_portid;
+static DEFINE_SPINLOCK(rio_mmap_lock);
 
 /**
  * rio_local_get_device_id - Get the base/extended device id for a port
@@ -397,6 +398,49 @@ int rio_release_inb_pwrite(struct rio_dev *rdev)
 }
 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
 
+/**
+ * rio_map_inb_region -- Map inbound memory region.
+ * @mport: Master port.
+ * @lstart: physical address of memory region to be mapped
+ * @rbase: RIO base address assigned to this window
+ * @size: Size of the memory region
+ * @rflags: Flags for mapping.
+ *
+ * Return: 0 -- Success.
+ *
+ * This function will create the mapping from RIO space to local memory.
+ */
+int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
+                       u64 rbase, u32 size, u32 rflags)
+{
+       int rc = 0;
+       unsigned long flags;
+
+       if (!mport->ops->map_inb)
+               return -1;
+       spin_lock_irqsave(&rio_mmap_lock, flags);
+       rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
+       spin_unlock_irqrestore(&rio_mmap_lock, flags);
+       return rc;
+}
+EXPORT_SYMBOL_GPL(rio_map_inb_region);
+
+/**
+ * rio_unmap_inb_region -- Unmap the inbound memory region
+ * @mport: Master port
+ * @lstart: physical address of memory region to be unmapped
+ */
+void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
+{
+       unsigned long flags;
+       if (!mport->ops->unmap_inb)
+               return;
+       spin_lock_irqsave(&rio_mmap_lock, flags);
+       mport->ops->unmap_inb(mport, lstart);
+       spin_unlock_irqrestore(&rio_mmap_lock, flags);
+}
+EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
+
 /**
  * rio_mport_get_physefb - Helper function that returns register offset
  *                      for Physical Layer Extended Features Block.