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d58b0c39e3
The hotplug mediabay has tendrils deep into drivers/ide code which makes a libata port reather difficult. In addition it's ugly and could be done better. This reworks the interface between the mediabay and the rest of the world so that: - Any macio_driver can now have a mediabay_event callback which will be called when that driver sits on a mediabay and it's been either plugged or unplugged. The device type is passed as an argument. We can now move all the IDE cruft into the IDE driver itself - A check_media_bay() function can be used to take a peek at the type of device currently in the bay if any, a cleaner variant of the previous function with the same name. - A pair of lock/unlock functions are exposed to allow the IDE driver to block the hotplug callbacks during the initial setup and probing of the bay in order to avoid nasty race conditions. - The mediabay code no longer needs to spin on the status register of the IDE interface when it detects an IDE device, this is done just fine by the IDE code itself Overall, less code, simpler, and allows for another driver than our old drivers/ide based one. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
#ifndef __MACIO_ASIC_H__
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#define __MACIO_ASIC_H__
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#ifdef __KERNEL__
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#include <linux/of_device.h>
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extern struct bus_type macio_bus_type;
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/* MacIO device driver is defined later */
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struct macio_driver;
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struct macio_chip;
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#define MACIO_DEV_COUNT_RESOURCES 8
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#define MACIO_DEV_COUNT_IRQS 8
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/*
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* the macio_bus structure is used to describe a "virtual" bus
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* within a MacIO ASIC. It's typically provided by a macio_pci_asic
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* PCI device, but could be provided differently as well (nubus
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* machines using a fake OF tree).
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*
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* The pdev field can be NULL on non-PCI machines
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*/
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struct macio_bus
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{
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struct macio_chip *chip; /* macio_chip (private use) */
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int index; /* macio chip index in system */
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#ifdef CONFIG_PCI
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struct pci_dev *pdev; /* PCI device hosting this bus */
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#endif
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};
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/*
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* the macio_dev structure is used to describe a device
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* within an Apple MacIO ASIC.
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*/
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struct macio_dev
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{
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struct macio_bus *bus; /* macio bus this device is on */
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struct macio_dev *media_bay; /* Device is part of a media bay */
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struct of_device ofdev;
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struct device_dma_parameters dma_parms; /* ide needs that */
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int n_resources;
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struct resource resource[MACIO_DEV_COUNT_RESOURCES];
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int n_interrupts;
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struct resource interrupt[MACIO_DEV_COUNT_IRQS];
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};
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#define to_macio_device(d) container_of(d, struct macio_dev, ofdev.dev)
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#define of_to_macio_device(d) container_of(d, struct macio_dev, ofdev)
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extern struct macio_dev *macio_dev_get(struct macio_dev *dev);
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extern void macio_dev_put(struct macio_dev *dev);
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/*
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* Accessors to resources & interrupts and other device
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* fields
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*/
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static inline int macio_resource_count(struct macio_dev *dev)
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{
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return dev->n_resources;
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}
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static inline unsigned long macio_resource_start(struct macio_dev *dev, int resource_no)
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{
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return dev->resource[resource_no].start;
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}
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static inline unsigned long macio_resource_end(struct macio_dev *dev, int resource_no)
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{
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return dev->resource[resource_no].end;
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}
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static inline unsigned long macio_resource_len(struct macio_dev *dev, int resource_no)
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{
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struct resource *res = &dev->resource[resource_no];
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if (res->start == 0 || res->end == 0 || res->end < res->start)
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return 0;
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return res->end - res->start + 1;
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}
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extern int macio_enable_devres(struct macio_dev *dev);
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extern int macio_request_resource(struct macio_dev *dev, int resource_no, const char *name);
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extern void macio_release_resource(struct macio_dev *dev, int resource_no);
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extern int macio_request_resources(struct macio_dev *dev, const char *name);
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extern void macio_release_resources(struct macio_dev *dev);
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static inline int macio_irq_count(struct macio_dev *dev)
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{
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return dev->n_interrupts;
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}
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static inline int macio_irq(struct macio_dev *dev, int irq_no)
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{
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return dev->interrupt[irq_no].start;
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}
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static inline void macio_set_drvdata(struct macio_dev *dev, void *data)
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{
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dev_set_drvdata(&dev->ofdev.dev, data);
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}
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static inline void* macio_get_drvdata(struct macio_dev *dev)
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{
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return dev_get_drvdata(&dev->ofdev.dev);
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}
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static inline struct device_node *macio_get_of_node(struct macio_dev *mdev)
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{
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return mdev->ofdev.node;
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}
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#ifdef CONFIG_PCI
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static inline struct pci_dev *macio_get_pci_dev(struct macio_dev *mdev)
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{
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return mdev->bus->pdev;
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}
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#endif
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/*
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* A driver for a mac-io chip based device
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*/
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struct macio_driver
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{
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char *name;
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struct of_device_id *match_table;
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struct module *owner;
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int (*probe)(struct macio_dev* dev, const struct of_device_id *match);
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int (*remove)(struct macio_dev* dev);
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int (*suspend)(struct macio_dev* dev, pm_message_t state);
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int (*resume)(struct macio_dev* dev);
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int (*shutdown)(struct macio_dev* dev);
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#ifdef CONFIG_PMAC_MEDIABAY
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void (*mediabay_event)(struct macio_dev* dev, int mb_state);
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#endif
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struct device_driver driver;
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};
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#define to_macio_driver(drv) container_of(drv,struct macio_driver, driver)
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extern int macio_register_driver(struct macio_driver *);
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extern void macio_unregister_driver(struct macio_driver *);
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#endif /* __KERNEL__ */
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#endif /* __MACIO_ASIC_H__ */
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