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- /*
- * Header for Microchannel Architecture Bus
- * Written by Martin Kolinek, February 1996
- */
-
- #ifndef _LINUX_MCA_H
- #define _LINUX_MCA_H
-
- /* The detection of MCA bus is done in the real mode (using BIOS).
- * The information is exported to the protected code, where this
- * variable is set to one in case MCA bus was detected.
- */
- extern int MCA_bus;
-
- /* maximal number of MCA slots - actually, some machines have less, but
- they all have sufficient number of POS registers to cover 8. */
- #define MCA_MAX_SLOT_NR 8
-
- /* MCA_NOTFOUND is an error condition. The other two indicate
- motherboard POS registers contain the adapter. They might be
- returned by the mca_find_adapter() function, and can be used as
- arguments to mca_read_stored_pos(). I'm not going to allow direct
- access to the motherboard registers until we run across an adapter
- that requires it. We don't know enough about them to know if it's
- safe.
-
- See Documentation/mca.txt or one of the existing drivers for
- more information.
- */
- #define MCA_NOTFOUND (-1)
- #define MCA_INTEGSCSI (MCA_MAX_SLOT_NR)
- #define MCA_INTEGVIDEO (MCA_MAX_SLOT_NR+1)
-
- /* max number of adapters, including both slots and various integrated
- things. */
- #define MCA_NUMADAPTERS (MCA_MAX_SLOT_NR+2)
-
- /* returns the slot of the first enabled adapter matching id. User can
- specify a starting slot beyond zero, to deal with detecting multiple
- devices. Returns MCA_NOTFOUND if id not found. Also checks the
- integrated adapters. */
- extern int mca_find_adapter(int id, int start);
- extern int mca_find_unused_adapter(int id, int start);
-
- /* adapter state info - returns 0 if no */
- extern int mca_isadapter(int slot);
- extern int mca_isenabled(int slot);
-
- extern int mca_is_adapter_used(int slot);
- extern int mca_mark_as_used(int slot);
- extern void mca_mark_as_unused(int slot);
-
- /* gets a byte out of POS register (stored in memory) */
- extern unsigned char mca_read_stored_pos(int slot, int reg);
-
- /*
- This can be expanded later. Right now, it gives us a way of
- getting meaningful information into the MCA_info structure,
- so we can have a more interesting /proc/mca.
- */
- extern void mca_set_adapter_name(int slot, char* name);
- extern char* mca_get_adapter_name(int slot);
-
- /*
- This sets up an information callback for /proc/mca/slot?. The
- function is called with the buffer, slot, and device pointer (or
- some equally informative context information, or nothing, if you
- prefer), and is expected to put useful information into the
- buffer. The adapter name, id, and POS registers get printed
- before this is called though, so don't do it again.
-
- This should be called with a NULL procfn when a module
- unregisters, thus preventing kernel crashes and other such
- nastiness.
- */
- typedef int (*MCA_ProcFn)(char* buf, int slot, void* dev);
- extern void mca_set_adapter_procfn(int slot, MCA_ProcFn, void* dev);
-
- /* These routines actually mess with the hardware POS registers. They
- temporarily disable the device (and interrupts), so make sure you know
- what you're doing if you use them. Furthermore, writing to a POS may
- result in two devices trying to share a resource, which in turn can
- result in multiple devices sharing memory spaces, IRQs, or even trashing
- hardware. YOU HAVE BEEN WARNED.
-
- You can only access slots with this. Motherboard registers are off
- limits.
- */
-
- /* read a byte from the specified POS register. */
- extern unsigned char mca_read_pos(int slot, int reg);
-
- /* write a byte to the specified POS register. */
- extern void mca_write_pos(int slot, int reg, unsigned char byte);
-
- /* Should only be called by the NMI interrupt handler, this will do some
- fancy stuff to figure out what might have generated a NMI. */
- extern void mca_handle_nmi(void);
-
- #endif /* _LINUX_MCA_H */
-