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Subject[PATCH 03/21] soc/fsl/qman: map FQD and PFDR areas in the iommu
Date
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>

Add a one-to-one iommu mapping for qman private data memory areas
(FQD and PFDR). This is required for QMAN to work without faults
behind an iommu.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
---
drivers/soc/fsl/qbman/qman_ccsr.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/soc/fsl/qbman/qman_ccsr.c b/drivers/soc/fsl/qbman/qman_ccsr.c
index 619e22030460..7163f7511ce1 100644
--- a/drivers/soc/fsl/qbman/qman_ccsr.c
+++ b/drivers/soc/fsl/qbman/qman_ccsr.c
@@ -29,6 +29,7 @@
*/

#include "qman_priv.h"
+#include <linux/iommu.h>

u16 qman_ip_rev;
EXPORT_SYMBOL(qman_ip_rev);
@@ -692,6 +693,7 @@ static int fsl_qman_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
+ struct iommu_domain *domain;
struct resource *res;
int ret, err_irq;
u16 id;
@@ -769,6 +771,21 @@ static int fsl_qman_probe(struct platform_device *pdev)
}
dev_dbg(dev, "Allocated PFDR 0x%llx 0x%zx\n", pfdr_a, pfdr_sz);

+ /* Create an 1-to-1 iommu mapping for fqd and pfdr areas */
+ domain = iommu_get_domain_for_dev(dev);
+ if (domain) {
+ ret = iommu_map(domain,
+ fqd_a, fqd_a, fqd_sz,
+ IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
+ if (ret)
+ dev_warn(dev, "iommu_map(fqd) failed %d\n", ret);
+ ret = iommu_map(domain,
+ pfdr_a, pfdr_a, pfdr_sz,
+ IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
+ if (ret)
+ dev_warn(dev, "iommu_map(pfdr) failed %d\n", ret);
+ }
+
ret = qman_init_ccsr(dev);
if (ret) {
dev_err(dev, "CCSR setup failed\n");
--
2.17.1
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