From: Codrin Ciubotariu <codrin.ciubotariu@nxp.com>
To: <iommu@lists.linux-foundation.org>
Cc: <scottwood@freescale.com>, <Varun.Sethi@freescale.com>,
<linuxppc-dev@lists.ozlabs.org>,
Codrin Ciubotariu <codrin.ciubotariu@nxp.com>
Subject: [PATCH 3/7] iommu/fsl: Enable OMT cache, before invalidating PAACT and SPAACT cache
Date: Mon, 7 Mar 2016 17:34:19 +0200 [thread overview]
Message-ID: <1457364863-18004-4-git-send-email-codrin.ciubotariu@nxp.com> (raw)
In-Reply-To: <1457364863-18004-1-git-send-email-codrin.ciubotariu@nxp.com>
From: Varun Sethi <Varun.Sethi@freescale.com>
Enable OMT cache, before invalidating PAACT and SPAACT cache. This
is a PAMU hardware errata work around.
Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@nxp.com>
---
drivers/iommu/fsl_pamu.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
index a00c473..ce25084 100644
--- a/drivers/iommu/fsl_pamu.c
+++ b/drivers/iommu/fsl_pamu.c
@@ -731,6 +731,16 @@ static int setup_one_pamu(unsigned long pamu_reg_base,
pamu_regs = (struct pamu_mmap_regs *)
(pamu_reg_base + PAMU_MMAP_REGS_BASE);
+ /*
+ * As per PAMU errata A-005982, writing the PAACT and SPAACT
+ * base address registers wouldn't invalidate the corresponding
+ * caches if the OMT cache is disabled. The workaround is to
+ * enable the OMT cache before setting the base registers.
+ * This can be done without actually enabling PAMU.
+ */
+
+ out_be32(pc, PAMU_PC_OCE);
+
/* set up pointers to corenet control blocks */
out_be32(&pamu_regs->ppbah, upper_32_bits(ppaact_phys));
--
1.9.3
next prev parent reply other threads:[~2016-03-07 15:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-07 15:34 [PATCH 0/7] PAMU driver update Codrin Ciubotariu
2016-03-07 15:34 ` [PATCH 1/7] iommu/fsl: Fix most checkpatch warnings and typos Codrin Ciubotariu
2016-03-07 15:34 ` [PATCH 2/7] iommu/fsl: Work around erratum A-007907 Codrin Ciubotariu
2016-03-07 15:34 ` Codrin Ciubotariu [this message]
2016-03-07 15:34 ` [PATCH 4/7] iommu/fsl: Factor out PCI specific code Codrin Ciubotariu
2016-03-07 15:34 ` [PATCH 5/7] iommu/fsl: Enable default DMA window for PCIe devices once detached from domain Codrin Ciubotariu
2016-03-07 15:34 ` [PATCH 6/7] iommu/fsl: PAMU power management support Codrin Ciubotariu
2016-03-07 15:34 ` [PATCH 7/7] iommu/fsl: Added cache controller compatible strings for SOCs Codrin Ciubotariu
2016-03-22 13:59 ` [PATCH 0/7] PAMU driver update Codrin Constantin Ciubotariu
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