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authorAlexandre Bounine <alexandre.bounine@idt.com>2012-10-04 17:15:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-06 03:05:21 +0900
commitda1589f07393e88e917c317ea0c85ea37918a1cf (patch)
tree8ddfa8af4b15b463fb9f7f14f3e49b7f7d62248a /drivers/rapidio
parent18f6287f538858135c2c7ed4f76d4441e28b5714 (diff)
downloadlinux-da1589f07393e88e917c317ea0c85ea37918a1cf.tar.bz2
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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio')
-rw-r--r--drivers/rapidio/rio.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index c40665a4fa33..d7b68cc2d843 100644
--- 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
@@ -398,6 +399,49 @@ 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.
* @port: Master port to issue transaction