[RFC PATCH 1/2] RapidIO: Add DMA Engine support for RIO data transfers

[Alexandre Bounine]

Adds DMA Engine framework support into RapidIO subsystem.
Uses DMA Engine DMA_SLAVE interface to generate data transfers to/from remote
RapidIO target devices. Uses scatterlist to describe local data buffer and
dma_chan.private member to pass target specific information. Supports flat
data buffer only for a remote side.

Signed-off-by: Alexandre Bounine <alexandre.bounine@xxxxxxx>
Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
Cc: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
Cc: Li Yang <leoli@xxxxxxxxxxxxx>
---
 drivers/dma/dmaengine.c   |    4 ++
 drivers/rapidio/Kconfig   |    6 +++
 drivers/rapidio/rio.c     |   79 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/dmaengine.h |    1 +
 include/linux/rio.h       |   47 ++++++++++++++++++++++++++
 include/linux/rio_drv.h   |    9 +++++
 6 files changed, 146 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index b48967b..11fdc2c 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -699,6 +699,10 @@ int dma_async_device_register(struct dma_device *device)
 		!device->device_prep_dma_cyclic);
 	BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
 		!device->device_control);
+	BUG_ON(dma_has_cap(DMA_RAPIDIO, device->cap_mask) &&
+		!device->device_prep_slave_sg);
+	BUG_ON(dma_has_cap(DMA_RAPIDIO, device->cap_mask) &&
+		!device->device_control);
 
 	BUG_ON(!device->device_alloc_chan_resources);
 	BUG_ON(!device->device_free_chan_resources);
diff --git a/drivers/rapidio/Kconfig b/drivers/rapidio/Kconfig
index bc87192..c4aa279 100644
--- a/drivers/rapidio/Kconfig
+++ b/drivers/rapidio/Kconfig
@@ -34,3 +34,9 @@ config RAPIDIO_DEBUG
 	  If you are unsure about this, say N here.
 
 source "drivers/rapidio/switches/Kconfig"
+
+# This option to be turned on by a device selection
+config RAPIDIO_DMA_ENGINE
+	bool
+	select DMADEVICES
+	select DMA_ENGINE
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 86c9a09..e5905fc 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1121,6 +1121,85 @@ int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
 	return 0;
 }
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+
+#include <linux/dmaengine.h>
+
+static bool rio_chan_filter(struct dma_chan *chan, void *arg)
+{
+	struct rio_dev *rdev = arg;
+
+	/* Check that DMA device belongs to the right MPORT */
+	return (rdev->net->hport ==
+		container_of(chan->device, struct rio_mport, dma));
+}
+
+/**
+ * rio_request_dma - request RapidIO capable DMA channel that supports
+ *   specified target RapidIO device.
+ * @rdev: RIO device control structure
+ *
+ * Returns pointer to allocated DMA channel or NULL if failed.
+ */
+struct dma_chan *rio_request_dma(struct rio_dev *rdev)
+{
+	dma_cap_mask_t mask;
+	struct dma_chan *dchan;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_RAPIDIO, mask);
+	dchan = dma_request_channel(mask, rio_chan_filter, rdev);
+
+	return dchan;
+}
+EXPORT_SYMBOL_GPL(rio_request_dma);
+
+/**
+ * rio_release_dma - release specified DMA channel
+ * @dchan: DMA channel to release
+ */
+void rio_release_dma(struct dma_chan *dchan)
+{
+	dma_release_channel(dchan);
+}
+EXPORT_SYMBOL_GPL(rio_release_dma);
+
+/**
+ * rio_dma_prep_slave_sg - RapidIO specific wrapper
+ *   for device_prep_slave_sg callback defined by DMAENGINE.
+ * @rdev: RIO device control structure
+ * @dchan: DMA channel to configure
+ * @data: RIO specific data descriptor
+ * @direction: DMA data transfer direction (TO or FROM the device)
+ * @flags: dmaengine defined flags
+ *
+ * Initializes RapidIO capable DMA channel for the specified data transfer.
+ * Uses DMA channel private extension to pass information related to remote
+ * target RIO device.
+ * Returns pointer to DMA transaction descriptor or NULL if failed.
+ */
+struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
+	struct dma_chan *dchan, struct rio_dma_data *data,
+	enum dma_data_direction direction, unsigned long flags)
+{
+	struct dma_async_tx_descriptor *txd = NULL;
+	struct rio_dma_ext rio_ext;
+
+	rio_ext.destid = rdev->destid;
+	rio_ext.rio_addr_u = data->rio_addr_u;
+	rio_ext.rio_addr = data->rio_addr;
+	rio_ext.wr_type = data->wr_type;
+	dchan->private = &rio_ext;
+
+	txd = dchan->device->device_prep_slave_sg(dchan, data->sg, data->sg_len,
+						  direction, flags);
+
+	return txd;
+}
+EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
+
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
 static void rio_fixup_device(struct rio_dev *dev)
 {
 }
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 8fbf40e..867b685 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -70,6 +70,7 @@ enum dma_transaction_type {
 	DMA_PRIVATE,
 	DMA_ASYNC_TX,
 	DMA_SLAVE,
+	DMA_RAPIDIO,
 	DMA_CYCLIC,
 };
 
diff --git a/include/linux/rio.h b/include/linux/rio.h
index 4d50611..a6d1054c 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -20,6 +20,9 @@
 #include <linux/errno.h>
 #include <linux/device.h>
 #include <linux/rio_regs.h>
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+#include <linux/dmaengine.h>
+#endif
 
 #define RIO_NO_HOPCOUNT		-1
 #define RIO_INVALID_DESTID	0xffff
@@ -254,6 +257,9 @@ struct rio_mport {
 	u32 phys_efptr;
 	unsigned char name[40];
 	void *priv;		/* Master port private data */
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+	struct dma_device	dma;
+#endif
 };
 
 /**
@@ -395,6 +401,47 @@ union rio_pw_msg {
 	u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
 };
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+
+/**
+ * enum rio_write_type - RIO write transaction types used in DMA transfers
+ *
+ * Note: RapidIO specification defines write (NWRITE) and
+ * write-with-response (NWRITE_R) data transfer operations.
+ * Existing DMA controllers that service RapidIO may use one of these operations
+ * for entire data transfer or their combination with only the last data packet
+ * requires response.
+ */
+enum rio_write_type {
+	RDW_DEFAULT,		/* default method used by DMA driver */
+	RDW_ALL_NWRITE,		/* all packets use NWRITE */
+	RDW_ALL_NWRITE_R,	/* all packets use NWRITE_R */
+	RDW_LAST_NWRITE_R,	/* last packet uses NWRITE_R, all other - NWRITE */
+};
+
+struct rio_dma_ext {
+	u16 destid;
+	u64 rio_addr;	/* low 64-bits of 66-bit RapidIO address */
+	u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
+	enum rio_write_type wr_type; /* preferred RIO write operation type */
+};
+
+struct rio_dma_data {
+	/* Local data (as scatterlist) */
+	struct scatterlist	*sg;	/* I/O scatter list */
+	unsigned int		sg_len;	/* size of scatter list */
+	/* Remote device address (flat buffer) */
+	u64 rio_addr;	/* low 64-bits of 66-bit RapidIO address */
+	u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
+	enum rio_write_type wr_type; /* preferred RIO write operation type */
+};
+
+static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
+{
+	return container_of(ddev, struct rio_mport, dma);
+}
+#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
+
 /* Architecture and hardware-specific functions */
 extern int rio_register_mport(struct rio_mport *);
 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index 229b3ca..d140996 100644
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -378,6 +378,15 @@ void rio_unregister_driver(struct rio_driver *);
 struct rio_dev *rio_dev_get(struct rio_dev *);
 void rio_dev_put(struct rio_dev *);
 
+#ifdef CONFIG_RAPIDIO_DMA_ENGINE
+extern struct dma_chan *rio_request_dma(struct rio_dev *rdev);
+extern void rio_release_dma(struct dma_chan *dchan);
+extern struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(
+		struct rio_dev *rdev, struct dma_chan *dchan,
+		struct rio_dma_data *data, enum dma_data_direction direction,
+		unsigned long flags);
+#endif
+
 /**
  * rio_name - Get the unique RIO device identifier
  * @rdev: RIO device
-- 
1.7.6

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