@@ -20,6 +20,7 @@
#include <linux/sizes.h>
#include <linux/limits.h>
#include <linux/clk/clk-conf.h>
+#include <linux/platform_device.h>
#include <asm/irq.h>
@@ -188,12 +189,15 @@ static int amba_pm_runtime_resume(struct device *dev)
/*
* Primecells are part of the Advanced Microcontroller Bus Architecture,
* so we call the bus "amba".
+ * DMA configuration for platform and AMBA bus is same. So here we reuse
+ * platform's DMA config routine.
*/
struct bus_type amba_bustype = {
.name = "amba",
.dev_groups = amba_dev_groups,
.match = amba_match,
.uevent = amba_uevent,
+ .dma_configure = platform_dma_configure,
.pm = &amba_pm,
.force_dma = true,
};
@@ -329,36 +329,13 @@ void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
#endif
/*
- * Common configuration to enable DMA API use for a device
+ * enables DMA API use for a device
*/
-#include <linux/pci.h>
-
int dma_configure(struct device *dev)
{
- struct device *bridge = NULL, *dma_dev = dev;
- enum dev_dma_attr attr;
- int ret = 0;
-
- if (dev_is_pci(dev)) {
- bridge = pci_get_host_bridge_device(to_pci_dev(dev));
- dma_dev = bridge;
- if (IS_ENABLED(CONFIG_OF) && dma_dev->parent &&
- dma_dev->parent->of_node)
- dma_dev = dma_dev->parent;
- }
-
- if (dma_dev->of_node) {
- ret = of_dma_configure(dev, dma_dev->of_node);
- } else if (has_acpi_companion(dma_dev)) {
- attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
- if (attr != DEV_DMA_NOT_SUPPORTED)
- ret = acpi_dma_configure(dev, attr);
- }
-
- if (bridge)
- pci_put_host_bridge_device(bridge);
-
- return ret;
+ if (dev->bus->dma_configure)
+ return dev->bus->dma_configure(dev);
+ return 0;
}
void dma_deconfigure(struct device *dev)
@@ -1130,6 +1130,22 @@ int platform_pm_restore(struct device *dev)
#endif /* CONFIG_HIBERNATE_CALLBACKS */
+int platform_dma_configure(struct device *dev)
+{
+ enum dev_dma_attr attr;
+ int ret = 0;
+
+ if (dev->of_node) {
+ ret = of_dma_configure(dev, dev->of_node);
+ } else if (has_acpi_companion(dev)) {
+ attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
+ if (attr != DEV_DMA_NOT_SUPPORTED)
+ ret = acpi_dma_configure(dev, attr);
+ }
+
+ return ret;
+}
+
static const struct dev_pm_ops platform_dev_pm_ops = {
.runtime_suspend = pm_generic_runtime_suspend,
.runtime_resume = pm_generic_runtime_resume,
@@ -1141,6 +1157,7 @@ struct bus_type platform_bus_type = {
.dev_groups = platform_dev_groups,
.match = platform_match,
.uevent = platform_uevent,
+ .dma_configure = platform_dma_configure,
.pm = &platform_dev_pm_ops,
.force_dma = true,
};
@@ -314,6 +314,13 @@ static int host1x_device_match(struct device *dev, struct device_driver *drv)
return strcmp(dev_name(dev), drv->name) == 0;
}
+static int host1x_dma_configure(struct device *dev)
+{
+ if (dev->of_node)
+ return of_dma_configure(dev, dev->of_node);
+ return 0;
+}
+
static const struct dev_pm_ops host1x_device_pm_ops = {
.suspend = pm_generic_suspend,
.resume = pm_generic_resume,
@@ -326,6 +333,7 @@ static int host1x_device_match(struct device *dev, struct device_driver *drv)
struct bus_type host1x_bus_type = {
.name = "host1x",
.match = host1x_device_match,
+ .dma_configure = host1x_dma_configure,
.pm = &host1x_device_pm_ops,
.force_dma = true,
};
@@ -16,6 +16,8 @@
#include <linux/pm_runtime.h>
#include <linux/suspend.h>
#include <linux/kexec.h>
+#include <linux/of_device.h>
+#include <linux/acpi.h>
#include "pci.h"
#include "pcie/portdrv.h"
@@ -1577,6 +1579,35 @@ static int pci_bus_num_vf(struct device *dev)
return pci_num_vf(to_pci_dev(dev));
}
+/**
+ * pci_dma_configure - Setup DMA configuration
+ * @dev: ptr to dev structure
+ *
+ * Function to update PCI devices's DMA configuration using the same
+ * info from the OF node or ACPI node of host bridge's parent (if any).
+ */
+static int pci_dma_configure(struct device *dev)
+{
+ struct device *bridge;
+ int ret = 0;
+
+ bridge = pci_get_host_bridge_device(to_pci_dev(dev));
+
+ if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
+ bridge->parent->of_node) {
+ ret = of_dma_configure(dev, bridge->parent->of_node);
+ } else if (has_acpi_companion(bridge)) {
+ struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
+ enum dev_dma_attr attr = acpi_get_dma_attr(adev);
+
+ if (attr != DEV_DMA_NOT_SUPPORTED)
+ ret = acpi_dma_configure(dev, attr);
+ }
+
+ pci_put_host_bridge_device(bridge);
+ return ret;
+}
+
struct bus_type pci_bus_type = {
.name = "pci",
.match = pci_bus_match,
@@ -1589,6 +1620,7 @@ struct bus_type pci_bus_type = {
.drv_groups = pci_drv_groups,
.pm = PCI_PM_OPS_PTR,
.num_vf = pci_bus_num_vf,
+ .dma_configure = pci_dma_configure,
.force_dma = true,
};
EXPORT_SYMBOL(pci_bus_type);
@@ -88,6 +88,8 @@ extern int __must_check bus_create_file(struct bus_type *,
* @resume: Called to bring a device on this bus out of sleep mode.
* @num_vf: Called to find out how many virtual functions a device on this
* bus supports.
+ * @dma_configure: Called to setup DMA configuration on a device on
+ this bus.
* @pm: Power management operations of this bus, callback the specific
* device driver's pm-ops.
* @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
@@ -130,6 +132,8 @@ struct bus_type {
int (*num_vf)(struct device *dev);
+ int (*dma_configure)(struct device *dev);
+
const struct dev_pm_ops *pm;
const struct iommu_ops *iommu_ops;
@@ -356,6 +356,8 @@ static inline char *early_platform_driver_setup_func(void) \
#define platform_pm_restore NULL
#endif
+extern int platform_dma_configure(struct device *dev);
+
#ifdef CONFIG_PM_SLEEP
#define USE_PLATFORM_PM_SLEEP_OPS \
.suspend = platform_pm_suspend, \