On 09/06/2022 12:08, AngeloGioacchino Del Regno wrote:
On some SoCs (of which only MT8195 is supported at the time of writing),
the "R" and "W" (I/O) enable bits for the IOMMUs are in the pericfg_ao
register space and not in the IOMMU space: as it happened already with
infracfg, it is expected that this list will grow.
Instead of specifying pericfg compatibles on a per-SoC basis, following
what was done with infracfg, let's lookup the syscon by phandle instead.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
drivers/iommu/mtk_iommu.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 90685946fcbe..0ea0848581e9 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -138,6 +138,8 @@
/* PM and clock always on. e.g. infra iommu */
#define PM_CLK_AO BIT(15)
#define IFA_IOMMU_PCIE_SUPPORT BIT(16)
+/* IOMMU I/O (r/w) is enabled using PERICFG_IOMMU_1 register */
+#define HAS_PERI_IOMMU1_REG BIT(17)
From what I can see MTK_IOMMU_TYPE_INFRA is only set in MT8195 which uses
pericfg. So we don't need a new flag here. For me the flag name
MTK_IOMMU_TYPE_INFRA was confusing as it has nothing to do with the use of
infracfg. I'll hijack this patch to provide some feedback on the actual code,
please see below.
#define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask) \
((((pdata)->flags) & (mask)) == (_x))
@@ -187,7 +189,6 @@ struct mtk_iommu_plat_data {
u32 flags;
u32 inv_sel_reg;
- char *pericfg_comp_str;
struct list_head *hw_list;
unsigned int iova_region_nr;
const struct mtk_iommu_iova_region *iova_region;
@@ -1218,14 +1219,16 @@ static int mtk_iommu_probe(struct platform_device *pdev)
goto out_runtime_disable;
}
} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA) &&
- data->plat_data->pericfg_comp_str) {
Check for pericfg_comp_str is not needed, we only have one platform that uses
MTK_IOMMU_TYPE_INFRA.
- infracfg = syscon_regmap_lookup_by_compatible(data->plat_data->pericfg_comp_str);
We can do something like this to make the code clearer:
data->pericfg =
syscon_regmap_lookup_by_compatible(data->plat_data->pericfg_comp_str);
if (IS_ERR(data->pericfg)) {
Using infracfg variable here is confusing as it has nothing to do with infracfg
used with HAS_4GB_MODE flag.
Regards,
Matthias
- if (IS_ERR(infracfg)) {
- ret = PTR_ERR(infracfg);
- goto out_runtime_disable;
+ MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_PERI_IOMMU1_REG)) {
+ data->pericfg = syscon_regmap_lookup_by_phandle(dev->of_node, "mediatek,pericfg");
+ if (IS_ERR(data->pericfg)) {
+ p = "mediatek,mt8195-pericfg_ao";
+ data->pericfg = syscon_regmap_lookup_by_compatible(p);
+ if (IS_ERR(data->pericfg)) {
+ ret = PTR_ERR(data->pericfg);
+ goto out_runtime_disable;
+ }
}
-
- data->pericfg = infracfg;
}
platform_set_drvdata(pdev, data);
@@ -1484,8 +1487,8 @@ static const struct mtk_iommu_plat_data mt8192_data = {
static const struct mtk_iommu_plat_data mt8195_data_infra = {
.m4u_plat = M4U_MT8195,
.flags = WR_THROT_EN | DCM_DISABLE | STD_AXI_MODE | PM_CLK_AO |
- MTK_IOMMU_TYPE_INFRA | IFA_IOMMU_PCIE_SUPPORT,
- .pericfg_comp_str = "mediatek,mt8195-pericfg_ao",
+ HAS_PERI_IOMMU1_REG | MTK_IOMMU_TYPE_INFRA |
+ IFA_IOMMU_PCIE_SUPPORT,
.inv_sel_reg = REG_MMU_INV_SEL_GEN2,
.banks_num = 5,
.banks_enable = {true, false, false, false, true},
