Commit da1589f0 authored by Alexandre Bounine's avatar Alexandre Bounine Committed by Linus Torvalds
Browse files

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: default avatarAlexandre 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 18f6287f

drivers/rapidio/rio.c

+44 −0
Original line number Diff line number Diff line
@@ -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.

include/linux/rio.h

+5 −0
Original line number Diff line number Diff line
@@ -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

include/linux/rio_drv.h

+5 −0
Original line number Diff line number Diff line
@@ -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));

CRA Git | Maintained and supported by SUSTech CRA and CCSE