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Subject[PATCH 02/21] soc/fsl/bman: map FBPR area in the iommu
Date
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>

Add a one-to-one iommu mapping for bman private data memory (FBPR).
This is required for BMAN to work without faults behind an iommu.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
---
drivers/soc/fsl/qbman/bman_ccsr.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/soc/fsl/qbman/bman_ccsr.c b/drivers/soc/fsl/qbman/bman_ccsr.c
index 05c42235dd41..680f67f04fb4 100644
--- a/drivers/soc/fsl/qbman/bman_ccsr.c
+++ b/drivers/soc/fsl/qbman/bman_ccsr.c
@@ -29,6 +29,7 @@
*/

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

u16 bman_ip_rev;
EXPORT_SYMBOL(bman_ip_rev);
@@ -171,6 +172,7 @@ static int fsl_bman_probe(struct platform_device *pdev)
int ret, err_irq;
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
+ struct iommu_domain *domain;
struct resource *res;
u16 id, bm_pool_cnt;
u8 major, minor;
@@ -216,6 +218,16 @@ static int fsl_bman_probe(struct platform_device *pdev)

dev_dbg(dev, "Allocated FBPR 0x%llx 0x%zx\n", fbpr_a, fbpr_sz);

+ /* Create an 1-to-1 iommu mapping for FBPR area */
+ domain = iommu_get_domain_for_dev(dev);
+ if (domain) {
+ ret = iommu_map(iommu_get_domain_for_dev(dev),
+ fbpr_a, fbpr_a, fbpr_sz,
+ IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
+ if (ret)
+ dev_warn(dev, "failed to iommu_map() %d\n", ret);
+ }
+
bm_set_memory(fbpr_a, fbpr_sz);

err_irq = platform_get_irq(pdev, 0);
--
2.17.1
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