linux-kernel - [PATCH 24/30] rapidio: add outbound window support

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Date:	Fri,  5 Feb 2016 18:19:40 -0500
From:	Alexandre Bounine <alexandre.bounine@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alexandre Bounine <alexandre.bounine@....com>,
	Matt Porter <mporter@...nel.crashing.org>,
	Li Yang <leoli@...escale.com>,
	Aurelien Jacquiot <a-jacquiot@...com>,
	Andre van Herk <andre.van.herk@...drive-technologies.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 24/30] rapidio: add outbound window support

Add RapidIO controller (mport) outbound window configuration operations.
This patch is a part of the original patch submitted by Li Yang
(https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-April/071210.html).
For some reason the original part was not applied to mainline code tree.
The inbound window mapping part has been applied later during tsi721 mport
driver submission. Now goes the second part with corresponding HW support. 

Signed-off-by: Alexandre Bounine <alexandre.bounine@....com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Li Yang <leoli@...escale.com>
Cc: Aurelien Jacquiot <a-jacquiot@...com>
Cc: Andre van Herk <andre.van.herk@...drive-technologies.com>
Cc: linux-kernel@...r.kernel.org
---
 drivers/rapidio/rio.c   |   50 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/rio.h     |    5 ++++
 include/linux/rio_drv.h |    4 +++
 3 files changed, 59 insertions(+), 0 deletions(-)

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index fd5f17d..d336921 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -700,6 +700,56 @@ void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
 EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
 
 /**
+ * rio_map_outb_region -- Map outbound memory region.
+ * @mport: Master port.
+ * @destid: destination id window points to
+ * @rbase: RIO base address window translates to
+ * @size: Size of the memory region
+ * @rflags: Flags for mapping.
+ * @local: physical address of memory region mapped
+ *
+ * Return: 0 -- Success.
+ *
+ * This function will create the mapping from RIO space to local memory.
+ */
+int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,
+			u32 size, u32 rflags, dma_addr_t *local)
+{
+	int rc = 0;
+	unsigned long flags;
+
+	if (!mport->ops->map_outb)
+		return -ENODEV;
+
+	spin_lock_irqsave(&rio_mmap_lock, flags);
+	rc = mport->ops->map_outb(mport, destid, rbase, size,
+		rflags, local);
+	spin_unlock_irqrestore(&rio_mmap_lock, flags);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(rio_map_outb_region);
+
+/**
+ * rio_unmap_inb_region -- Unmap the inbound memory region
+ * @mport: Master port
+ * @destid: destination id mapping points to
+ * @rstart: RIO base address window translates to
+ */
+void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart)
+{
+	unsigned long flags;
+
+	if (!mport->ops->unmap_outb)
+		return;
+
+	spin_lock_irqsave(&rio_mmap_lock, flags);
+	mport->ops->unmap_outb(mport, destid, rstart);
+	spin_unlock_irqrestore(&rio_mmap_lock, flags);
+}
+EXPORT_SYMBOL_GPL(rio_unmap_outb_region);
+
+/**
  * rio_mport_get_physefb - Helper function that returns register offset
  *                      for Physical Layer Extended Features Block.
  * @port: Master port to issue transaction
diff --git a/include/linux/rio.h b/include/linux/rio.h
index 5dc556f..eca09bf 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -399,6 +399,8 @@ struct rio_mport_attr {
  * @map_inb: Callback to map RapidIO address region into local memory space.
  * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
  * @query_mport: Callback to query mport device attributes.
+ * @map_outb: Callback to map outbound address region into local memory space.
+ * @unmap_outb: Callback to unmap outbound RapidIO address region.
  */
 struct rio_ops {
 	int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
@@ -426,6 +428,9 @@ struct rio_ops {
 	void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
 	int (*query_mport)(struct rio_mport *mport,
 			   struct rio_mport_attr *attr);
+	int (*map_outb)(struct rio_mport *mport, u16 destid, u64 rstart,
+			u32 size, u32 flags, dma_addr_t *laddr);
+	void (*unmap_outb)(struct rio_mport *mport, u16 destid, u64 rstart);
 };
 
 #define RIO_RESOURCE_MEM	0x00000100
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index 5dff9a4..0834264 100644
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -369,6 +369,10 @@ void rio_release_region(struct rio_dev *, int);
 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);
+extern int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,
+			u32 size, u32 rflags, dma_addr_t *local);
+extern void rio_unmap_outb_region(struct rio_mport *mport,
+				  u16 destid, u64 rstart);
 
 /* Port-Write management */
 extern int rio_request_inb_pwrite(struct rio_dev *,
-- 
1.7.8.4