path: root/drivers/fpga
diff options
authorMike Looijmans <mike.looijmans@topic.nl>2018-11-07 11:51:48 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-11 12:58:27 -0800
commit9e9a615103e5aa209a2dfdf214ad34b187935a99 (patch)
treef2cce0d35bf7ee972efa2a1db3f569fa148b4aaa /drivers/fpga
parent68f60538daa4bc3da5d0764d46f391916fba20fd (diff)
zynq-fpga: Only route PR via PCAP when required
The Xilinx Zynq FPGA driver takes ownership of the PR interface, making it impossible to use the ICAP interface for partial reconfiguration. This patch changes the driver to only activate PR over PCAP while the device is actively being accessed by the driver for programming. This allows both PCAP and ICAP interfaces to be used for PR. Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Reviewed-by: Moritz Fischer <mdf@kernel.org> Acked-by: Alan Tull <atull@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga')
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c
index bb82efeebb9d..57b0e6775958 100644
--- a/drivers/fpga/zynq-fpga.c
+++ b/drivers/fpga/zynq-fpga.c
@@ -501,6 +501,10 @@ static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr,
if (err)
return err;
+ /* Release 'PR' control back to the ICAP */
+ zynq_fpga_write(priv, CTRL_OFFSET,
+ zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK);
err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status,
intr_status & IXR_PCFG_DONE_MASK,