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3a4955111a
Several modern devices, such as PC/104 cards, are expected to run on modern systems via an ISA bus interface. Since ISA is a legacy interface for most modern architectures, ISA support should remain disabled in general. Support for ISA-style drivers should be enabled on a per driver basis. To allow ISA-style drivers on modern systems, this patch introduces the ISA_BUS_API and ISA_BUS Kconfig options. The ISA bus driver will now build conditionally on the ISA_BUS_API Kconfig option, which defaults to the legacy ISA Kconfig option. The ISA_BUS Kconfig option allows the ISA_BUS_API Kconfig option to be selected on architectures which do not enable ISA (e.g. X86_64). The ISA_BUS Kconfig option is currently only implemented for X86 architectures. Other architectures may have their own ISA_BUS Kconfig options added as required. Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
71 lines
2 KiB
C
71 lines
2 KiB
C
/*
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* ISA bus.
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*/
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#ifndef __LINUX_ISA_H
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#define __LINUX_ISA_H
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#include <linux/device.h>
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#include <linux/kernel.h>
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struct isa_driver {
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int (*match)(struct device *, unsigned int);
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int (*probe)(struct device *, unsigned int);
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int (*remove)(struct device *, unsigned int);
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void (*shutdown)(struct device *, unsigned int);
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int (*suspend)(struct device *, unsigned int, pm_message_t);
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int (*resume)(struct device *, unsigned int);
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struct device_driver driver;
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struct device *devices;
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};
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#define to_isa_driver(x) container_of((x), struct isa_driver, driver)
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#ifdef CONFIG_ISA_BUS_API
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int isa_register_driver(struct isa_driver *, unsigned int);
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void isa_unregister_driver(struct isa_driver *);
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#else
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static inline int isa_register_driver(struct isa_driver *d, unsigned int i)
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{
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return 0;
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}
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static inline void isa_unregister_driver(struct isa_driver *d)
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{
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}
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#endif
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/**
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* module_isa_driver() - Helper macro for registering a ISA driver
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* @__isa_driver: isa_driver struct
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* @__num_isa_dev: number of devices to register
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*
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* Helper macro for ISA drivers which do not do anything special in module
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* init/exit. This eliminates a lot of boilerplate code. Each module may only
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* use this macro once, and calling it replaces module_init and module_exit.
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*/
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#define module_isa_driver(__isa_driver, __num_isa_dev) \
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static int __init __isa_driver##_init(void) \
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{ \
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return isa_register_driver(&(__isa_driver), __num_isa_dev); \
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} \
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module_init(__isa_driver##_init); \
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static void __exit __isa_driver##_exit(void) \
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{ \
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isa_unregister_driver(&(__isa_driver)); \
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} \
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module_exit(__isa_driver##_exit);
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/**
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* max_num_isa_dev() - Maximum possible number registered of an ISA device
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* @__ida_dev_ext: ISA device address extent
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*
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* The highest base address possible for an ISA device is 0x3FF; this results in
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* 1024 possible base addresses. Dividing the number of possible base addresses
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* by the address extent taken by each device results in the maximum number of
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* devices on a system.
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*/
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#define max_num_isa_dev(__isa_dev_ext) (1024 / __isa_dev_ext)
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#endif /* __LINUX_ISA_H */
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