From 180a43044faeaa9bfe0c604d472023a6446430b5 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Tue, 28 Mar 2006 19:57:34 -0500 Subject: [PATCH] ohci1394: clean up asynchronous and physical request filters programming Various cleanups of how ohci1394 programs AsynchronousRequestFilter, PhysicalRequestFilter, and physUpperBoundOffset. In particular, do not rewrite registers within the bus reset interrupt handler if bus resets do not affect the registers in the first place. Signed-off-by: Stefan Richter Signed-off-by: Jody McIntyre --- drivers/ieee1394/ohci1394.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) diff --git a/drivers/ieee1394/ohci1394.c b/drivers/ieee1394/ohci1394.c index eb329a875099..24d045c353e5 100644 --- a/drivers/ieee1394/ohci1394.c +++ b/drivers/ieee1394/ohci1394.c @@ -544,12 +544,19 @@ static void ohci_initialize(struct ti_ohci *ohci) /* Initialize IR Legacy DMA channel mask */ ohci->ir_legacy_channels = 0; - /* - * Accept AT requests from all nodes. This probably - * will have to be controlled from the subsystem - * on a per node basis. - */ - reg_write(ohci,OHCI1394_AsReqFilterHiSet, 0x80000000); + /* Accept AR requests from all nodes */ + reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000); + + /* Set the address range of the physical response unit. + * Most controllers do not implement it as a writable register though. + * They will keep a hardwired offset of 0x00010000 and show 0x0 as + * register content. + * To actually enable physical responses is the job of our interrupt + * handler which programs the physical request filter. */ + reg_write(ohci, OHCI1394_PhyUpperBound, 0xffff0000); + + DBGMSG("physUpperBoundOffset=%08x", + reg_read(ohci, OHCI1394_PhyUpperBound)); /* Specify AT retries */ reg_write(ohci, OHCI1394_ATRetries, @@ -2516,26 +2523,20 @@ static irqreturn_t ohci_irq_handler(int irq, void *dev_id, reg_write(ohci, OHCI1394_IntMaskSet, OHCI1394_busReset); spin_unlock_irqrestore(&ohci->event_lock, flags); - /* Accept Physical requests from all nodes. */ - reg_write(ohci,OHCI1394_AsReqFilterHiSet, 0xffffffff); - reg_write(ohci,OHCI1394_AsReqFilterLoSet, 0xffffffff); - /* Turn on phys dma reception. * * TODO: Enable some sort of filtering management. */ if (phys_dma) { - reg_write(ohci,OHCI1394_PhyReqFilterHiSet, 0xffffffff); - reg_write(ohci,OHCI1394_PhyReqFilterLoSet, 0xffffffff); - reg_write(ohci,OHCI1394_PhyUpperBound, 0xffff0000); - } else { - reg_write(ohci,OHCI1394_PhyReqFilterHiSet, 0x00000000); - reg_write(ohci,OHCI1394_PhyReqFilterLoSet, 0x00000000); + reg_write(ohci, OHCI1394_PhyReqFilterHiSet, + 0xffffffff); + reg_write(ohci, OHCI1394_PhyReqFilterLoSet, + 0xffffffff); } DBGMSG("PhyReqFilter=%08x%08x", - reg_read(ohci,OHCI1394_PhyReqFilterHiSet), - reg_read(ohci,OHCI1394_PhyReqFilterLoSet)); + reg_read(ohci, OHCI1394_PhyReqFilterHiSet), + reg_read(ohci, OHCI1394_PhyReqFilterLoSet)); hpsb_selfid_complete(host, phyid, isroot); } else -- 2.20.1