From da1589f07393e88e917c317ea0c85ea37918a1cf Mon Sep 17 00:00:00 2001 From: Alexandre Bounine Date: Thu, 4 Oct 2012 17:15:57 -0700 Subject: 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 (https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-April/071210.html) Signed-off-by: Alexandre Bounine Cc: Matt Porter Cc: Li Yang Cc: Kumar Gala Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rapidio/rio.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) (limited to 'drivers/rapidio') diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index c40665a4fa3..d7b68cc2d84 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 @@ -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. -- cgit v1.2.3-70-g09d2