7b07cbefb6
Failures to look up an IOMMU when parsing the DT iommus property need to be handled separately from the .of_xlate() failures to support deferred probing. The lack of a registered IOMMU can be caused by the lack of a driver for the IOMMU, the IOMMU device probe not having been performed yet, having been deferred, or having failed. The first case occurs when the device tree describes the bus master and IOMMU topology correctly but no device driver exists for the IOMMU yet or the device driver has not been compiled in. Return NULL, the caller will configure the device without an IOMMU. The second and third cases are handled by deferring the probe of the bus master device which will eventually get reprobed after the IOMMU. The last case is currently handled by deferring the probe of the bus master device as well. A mechanism to either configure the bus master device without an IOMMU or to fail the bus master device probe depending on whether the IOMMU is optional or mandatory would be a good enhancement. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
117 lines
3 KiB
C
117 lines
3 KiB
C
#ifndef _LINUX_OF_DEVICE_H
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#define _LINUX_OF_DEVICE_H
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#include <linux/cpu.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h> /* temporary until merge */
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#include <linux/of.h>
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#include <linux/mod_devicetable.h>
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struct device;
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#ifdef CONFIG_OF
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extern const struct of_device_id *of_match_device(
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const struct of_device_id *matches, const struct device *dev);
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/**
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* of_driver_match_device - Tell if a driver's of_match_table matches a device.
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* @drv: the device_driver structure to test
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* @dev: the device structure to match against
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*/
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static inline int of_driver_match_device(struct device *dev,
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const struct device_driver *drv)
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{
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return of_match_device(drv->of_match_table, dev) != NULL;
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}
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extern struct platform_device *of_dev_get(struct platform_device *dev);
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extern void of_dev_put(struct platform_device *dev);
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extern int of_device_add(struct platform_device *pdev);
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extern int of_device_register(struct platform_device *ofdev);
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extern void of_device_unregister(struct platform_device *ofdev);
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extern const void *of_device_get_match_data(const struct device *dev);
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extern ssize_t of_device_get_modalias(struct device *dev,
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char *str, ssize_t len);
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extern int of_device_request_module(struct device *dev);
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extern void of_device_uevent(struct device *dev, struct kobj_uevent_env *env);
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extern int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env);
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static inline void of_device_node_put(struct device *dev)
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{
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of_node_put(dev->of_node);
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}
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static inline struct device_node *of_cpu_device_node_get(int cpu)
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{
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struct device *cpu_dev;
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev)
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return NULL;
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return of_node_get(cpu_dev->of_node);
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}
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int of_dma_configure(struct device *dev, struct device_node *np);
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void of_dma_deconfigure(struct device *dev);
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#else /* CONFIG_OF */
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static inline int of_driver_match_device(struct device *dev,
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const struct device_driver *drv)
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{
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return 0;
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}
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static inline void of_device_uevent(struct device *dev,
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struct kobj_uevent_env *env) { }
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static inline const void *of_device_get_match_data(const struct device *dev)
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{
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return NULL;
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}
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static inline int of_device_get_modalias(struct device *dev,
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char *str, ssize_t len)
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{
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return -ENODEV;
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}
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static inline int of_device_request_module(struct device *dev)
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{
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return -ENODEV;
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}
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static inline int of_device_uevent_modalias(struct device *dev,
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struct kobj_uevent_env *env)
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{
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return -ENODEV;
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}
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static inline void of_device_node_put(struct device *dev) { }
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static inline const struct of_device_id *__of_match_device(
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const struct of_device_id *matches, const struct device *dev)
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{
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return NULL;
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}
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#define of_match_device(matches, dev) \
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__of_match_device(of_match_ptr(matches), (dev))
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static inline struct device_node *of_cpu_device_node_get(int cpu)
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{
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return NULL;
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}
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static inline int of_dma_configure(struct device *dev, struct device_node *np)
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{
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return 0;
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}
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static inline void of_dma_deconfigure(struct device *dev)
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{}
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#endif /* CONFIG_OF */
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#endif /* _LINUX_OF_DEVICE_H */
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