diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 62 |
1 files changed, 37 insertions, 25 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 7eed55484ad6..e068c6f4d1d6 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1675,7 +1675,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu) unsigned long size; void __iomem *gr0_base = ARM_SMMU_GR0(smmu); u32 id; - bool cttw_dt, cttw_reg; + bool cttw_reg, cttw_fw = smmu->features & ARM_SMMU_FEAT_COHERENT_WALK; int i; dev_notice(smmu->dev, "probing hardware configuration...\n"); @@ -1720,20 +1720,17 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu) /* * In order for DMA API calls to work properly, we must defer to what - * the DT says about coherency, regardless of what the hardware claims. + * the FW says about coherency, regardless of what the hardware claims. * Fortunately, this also opens up a workaround for systems where the * ID register value has ended up configured incorrectly. */ - cttw_dt = of_dma_is_coherent(smmu->dev->of_node); cttw_reg = !!(id & ID0_CTTW); - if (cttw_dt) - smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK; - if (cttw_dt || cttw_reg) + if (cttw_fw || cttw_reg) dev_notice(smmu->dev, "\t%scoherent table walk\n", - cttw_dt ? "" : "non-"); - if (cttw_dt != cttw_reg) + cttw_fw ? "" : "non-"); + if (cttw_fw != cttw_reg) dev_notice(smmu->dev, - "\t(IDR0.CTTW overridden by dma-coherent property)\n"); + "\t(IDR0.CTTW overridden by FW configuration)\n"); /* Max. number of entries we have for stream matching/indexing */ size = 1 << ((id >> ID0_NUMSIDB_SHIFT) & ID0_NUMSIDB_MASK); @@ -1914,15 +1911,25 @@ static const struct of_device_id arm_smmu_of_match[] = { }; MODULE_DEVICE_TABLE(of, arm_smmu_of_match); -static int arm_smmu_device_dt_probe(struct platform_device *pdev) +static int arm_smmu_device_dt_probe(struct platform_device *pdev, + struct arm_smmu_device *smmu) { const struct arm_smmu_match_data *data; - struct resource *res; - struct arm_smmu_device *smmu; struct device *dev = &pdev->dev; - int num_irqs, i, err; bool legacy_binding; + if (of_property_read_u32(dev->of_node, "#global-interrupts", + &smmu->num_global_irqs)) { + dev_err(dev, "missing #global-interrupts property\n"); + return -ENODEV; + } + + data = of_device_get_match_data(dev); + smmu->version = data->version; + smmu->model = data->model; + + parse_driver_options(smmu); + legacy_binding = of_find_property(dev->of_node, "mmu-masters", NULL); if (legacy_binding && !using_generic_binding) { if (!using_legacy_binding) @@ -1935,6 +1942,19 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) return -ENODEV; } + if (of_dma_is_coherent(dev->of_node)) + smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK; + + return 0; +} + +static int arm_smmu_device_probe(struct platform_device *pdev) +{ + struct resource *res; + struct arm_smmu_device *smmu; + struct device *dev = &pdev->dev; + int num_irqs, i, err; + smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL); if (!smmu) { dev_err(dev, "failed to allocate arm_smmu_device\n"); @@ -1942,9 +1962,9 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) } smmu->dev = dev; - data = of_device_get_match_data(dev); - smmu->version = data->version; - smmu->model = data->model; + err = arm_smmu_device_dt_probe(pdev, smmu); + if (err) + return err; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); smmu->base = devm_ioremap_resource(dev, res); @@ -1952,12 +1972,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) return PTR_ERR(smmu->base); smmu->size = resource_size(res); - if (of_property_read_u32(dev->of_node, "#global-interrupts", - &smmu->num_global_irqs)) { - dev_err(dev, "missing #global-interrupts property\n"); - return -ENODEV; - } - num_irqs = 0; while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) { num_irqs++; @@ -1992,8 +2006,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) if (err) return err; - parse_driver_options(smmu); - if (smmu->version == ARM_SMMU_V2 && smmu->num_context_banks != smmu->num_context_irqs) { dev_err(dev, @@ -2055,7 +2067,7 @@ static struct platform_driver arm_smmu_driver = { .name = "arm-smmu", .of_match_table = of_match_ptr(arm_smmu_of_match), }, - .probe = arm_smmu_device_dt_probe, + .probe = arm_smmu_device_probe, .remove = arm_smmu_device_remove, }; |