rapidio: add inbound memory mapping interface

Add common inbound memory mapping/unmapping interface. This allows to make
local memory space accessible from the RapidIO side using hardware mapping
capabilities of RapidIO bridging devices. The new interface is intended to
enable data transfers between RapidIO devices in combination with DMA engine
support.

This patch is based on patch submitted by Li Yang <leoli@freescale.com>
(https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-April/071210.html)

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index c40665a4fa3347a8b9bdb1edd12c4b48eacb5d43..d7b68cc2d8433b2e08693258b63cbca37a17da98 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.

diff --git a/include/linux/rio.h b/include/linux/rio.h
index ba382f2b57ef1b6be5163e511b9a675f0542d092..4d1a104cd78decf04d8492353ff0ee20f12d9c4f 100644 (file)
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -301,6 +301,8 @@ struct rio_net {
  * @add_outb_message: Callback to add a message to an outbound mailbox queue.
  * @add_inb_buffer: Callback to        add a buffer to an inbound mailbox queue.
  * @get_inb_message: Callback to get a message from an inbound mailbox queue.
+ * @map_inb: Callback to map RapidIO address region into local memory space.
+ * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
  */
 struct rio_ops {
        int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
@@ -323,6 +325,9 @@ struct rio_ops {
                                 int mbox, void *buffer, size_t len);
        int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
        void *(*get_inb_message)(struct rio_mport *mport, int mbox);
+       int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
+                       u64 rstart, u32 size, u32 flags);
+       void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
 };
 
 #define RIO_RESOURCE_MEM       0x00000100

diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index 31ad146be3168bd127bdd083a0288f940f1b154b..b75c05920ab58f976cb73223ce7a7da97a4b146d 100644 (file)
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -365,6 +365,11 @@ void rio_release_regions(struct rio_dev *);
 int rio_request_region(struct rio_dev *, int, char *);
 void rio_release_region(struct rio_dev *, int);
 
+/* Memory mapping functions */
+extern int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
+                       u64 rbase, u32 size, u32 rflags);
+extern void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart);
+
 /* Port-Write management */
 extern int rio_request_inb_pwrite(struct rio_dev *,
                        int (*)(struct rio_dev *, union rio_pw_msg*, int));