| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From 55705ace9136e1c24d92d7ab23e513439eb766e7 Mon Sep 17 00:00:00 2001 |
| 2 | From: Laurentiu Tudor <laurentiu.tudor@nxp.com> |
| 3 | Date: Tue, 3 Apr 2018 17:55:00 +0300 |
| 4 | Subject: [PATCH] soc/fsl/bman: map FBPR area in the iommu |
| 5 | |
| 6 | Add a one-to-one iommu mapping for bman private data memory (FBPR). |
| 7 | This is required for BMAN to work without faults behind an iommu. |
| 8 | |
| 9 | Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> |
| 10 | --- |
| 11 | drivers/soc/fsl/qbman/bman_ccsr.c | 11 +++++++++++ |
| 12 | 1 file changed, 11 insertions(+) |
| 13 | |
| 14 | --- a/drivers/soc/fsl/qbman/bman_ccsr.c |
| 15 | +++ b/drivers/soc/fsl/qbman/bman_ccsr.c |
| 16 | @@ -29,6 +29,7 @@ |
| 17 | */ |
| 18 | |
| 19 | #include "bman_priv.h" |
| 20 | +#include <linux/iommu.h> |
| 21 | |
| 22 | u16 bman_ip_rev; |
| 23 | EXPORT_SYMBOL(bman_ip_rev); |
| 24 | @@ -210,6 +211,7 @@ static int fsl_bman_probe(struct platfor |
| 25 | int ret, err_irq; |
| 26 | struct device *dev = &pdev->dev; |
| 27 | struct device_node *node = dev->of_node; |
| 28 | + struct iommu_domain *domain; |
| 29 | struct resource *res; |
| 30 | u16 id, bm_pool_cnt; |
| 31 | u8 major, minor; |
| 32 | @@ -257,6 +259,15 @@ static int fsl_bman_probe(struct platfor |
| 33 | |
| 34 | dev_dbg(dev, "Allocated FBPR 0x%llx 0x%zx\n", fbpr_a, fbpr_sz); |
| 35 | |
| 36 | + /* Create an 1-to-1 iommu mapping for FBPR area */ |
| 37 | + domain = iommu_get_domain_for_dev(dev); |
| 38 | + if (domain) { |
| 39 | + ret = iommu_map(domain, fbpr_a, fbpr_a, fbpr_sz, |
| 40 | + IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE); |
| 41 | + if (ret) |
| 42 | + dev_warn(dev, "failed to iommu_map() %d\n", ret); |
| 43 | + } |
| 44 | + |
| 45 | bm_set_memory(fbpr_a, fbpr_sz); |
| 46 | |
| 47 | err_irq = platform_get_irq(pdev, 0); |