diff options
Diffstat (limited to 'drivers/amba/bus.c')
| -rw-r--r-- | drivers/amba/bus.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index 7e775ba6fdd9..3a2adeaef5ce 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -20,6 +20,10 @@ #include <linux/platform_device.h> #include <linux/reset.h> #include <linux/of_irq.h> +#include <linux/of_device.h> +#include <linux/acpi.h> +#include <linux/iommu.h> +#include <linux/dma-map-ops.h> #define to_amba_driver(d) container_of(d, struct amba_driver, drv) @@ -273,6 +277,36 @@ static void amba_shutdown(struct device *dev) drv->shutdown(to_amba_device(dev)); } +static int amba_dma_configure(struct device *dev) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + enum dev_dma_attr attr; + int ret = 0; + + if (dev->of_node) { + ret = of_dma_configure(dev, dev->of_node, true); + } else if (has_acpi_companion(dev)) { + attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode)); + ret = acpi_dma_configure(dev, attr); + } + + if (!ret && !drv->driver_managed_dma) { + ret = iommu_device_use_default_domain(dev); + if (ret) + arch_teardown_dma_ops(dev); + } + + return ret; +} + +static void amba_dma_cleanup(struct device *dev) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + + if (!drv->driver_managed_dma) + iommu_device_unuse_default_domain(dev); +} + #ifdef CONFIG_PM /* * Hooks to provide runtime PM of the pclk (bus clock). It is safe to @@ -341,7 +375,8 @@ struct bus_type amba_bustype = { .probe = amba_probe, .remove = amba_remove, .shutdown = amba_shutdown, - .dma_configure = platform_dma_configure, + .dma_configure = amba_dma_configure, + .dma_cleanup = amba_dma_cleanup, .pm = &amba_pm, }; EXPORT_SYMBOL_GPL(amba_bustype); |