55 lines
1.6 KiB
Diff
55 lines
1.6 KiB
Diff
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From 488b62aa444440690708e5ea823bb0d54c296c4f Mon Sep 17 00:00:00 2001
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From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
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Date: Tue, 3 Apr 2018 18:18:30 +0300
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Subject: [PATCH] soc/fsl/qman-portal: map CENA area in the iommu
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Add a one-to-one iommu mapping for qman portal CENA register area.
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This is required for QMAN stashing to work without faults behind
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an iommu.
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Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
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---
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drivers/soc/fsl/qbman/qman_portal.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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--- a/drivers/soc/fsl/qbman/qman_portal.c
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+++ b/drivers/soc/fsl/qbman/qman_portal.c
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@@ -29,6 +29,7 @@
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*/
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#include "qman_priv.h"
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+#include <linux/iommu.h>
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struct qman_portal *qman_dma_portal;
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EXPORT_SYMBOL(qman_dma_portal);
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@@ -231,6 +232,7 @@ static int qman_portal_probe(struct plat
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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+ struct iommu_domain *domain;
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struct qm_portal_config *pcfg;
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struct resource *addr_phys[2];
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int irq, cpu, err, i;
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@@ -294,6 +296,21 @@ static int qman_portal_probe(struct plat
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goto err_ioremap2;
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}
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+ /* Create an 1-to-1 iommu mapping for cena portal area */
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+ domain = iommu_get_domain_for_dev(dev);
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+ if (domain) {
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+ /*
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+ * Note: not mapping this as cacheable triggers the infamous
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+ * QMan CIDE error.
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+ */
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+ err = iommu_map(domain,
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+ addr_phys[0]->start, addr_phys[0]->start,
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+ resource_size(addr_phys[0]),
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+ IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
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+ if (err)
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+ dev_warn(dev, "failed to iommu_map() %d\n", err);
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+ }
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+
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pcfg->pools = qm_get_pools_sdqcr();
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spin_lock(&qman_lock);
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