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2f7dd07eca
The /proc/bus/nubus/s/ directory tree for any slot s is missing a lot of information. The struct file_operations methods have long been left unimplemented (hence the familiar compile-time warning, "Need to set some I/O handlers here"). Slot resources have a complex structure which varies depending on board function. The logic for interpreting these ROM data structures is found in nubus.c. Let's not duplicate that logic in proc.c. Create the /proc/bus/nubus/s/ inodes while scanning slot s. During descent through slot resource subdirectories, call the new nubus_proc_add_foo() functions to create the procfs inodes. Also add a new function, nubus_seq_write_rsrc_mem(), to write the contents of a particular slot resource to a given seq_file. This is used by the procfs file_operations methods, to finally give userspace access to slot ROM information, such as the available video modes. Tested-by: Stan Johnson <userm57@yahoo.com> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
166 lines
5 KiB
C
166 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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nubus.h: various definitions and prototypes for NuBus drivers to use.
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Originally written by Alan Cox.
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Hacked to death by C. Scott Ananian and David Huggins-Daines.
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*/
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#ifndef LINUX_NUBUS_H
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#define LINUX_NUBUS_H
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#include <asm/nubus.h>
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#include <uapi/linux/nubus.h>
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struct proc_dir_entry;
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struct seq_file;
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struct nubus_dir {
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unsigned char *base;
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unsigned char *ptr;
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int done;
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int mask;
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struct proc_dir_entry *procdir;
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};
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struct nubus_dirent {
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unsigned char *base;
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unsigned char type;
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__u32 data; /* Actually 24 bits used */
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int mask;
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};
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struct nubus_board {
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struct nubus_board *next;
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struct nubus_dev *first_dev;
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/* Only 9-E actually exist, though 0-8 are also theoretically
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possible, and 0 is a special case which represents the
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motherboard and onboard peripherals (Ethernet, video) */
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int slot;
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/* For slot 0, this is bogus. */
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char name[64];
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/* Format block */
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unsigned char *fblock;
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/* Root directory (does *not* always equal fblock + doffset!) */
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unsigned char *directory;
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unsigned long slot_addr;
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/* Offset to root directory (sometimes) */
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unsigned long doffset;
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/* Length over which to compute the crc */
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unsigned long rom_length;
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/* Completely useless most of the time */
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unsigned long crc;
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unsigned char rev;
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unsigned char format;
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unsigned char lanes;
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/* Directory entry in /proc/bus/nubus */
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struct proc_dir_entry *procdir;
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};
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struct nubus_dev {
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/* Next link in device list */
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struct nubus_dev *next;
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/* The functional resource ID of this device */
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unsigned char resid;
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/* These are mostly here for convenience; we could always read
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them from the ROMs if we wanted to */
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unsigned short category;
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unsigned short type;
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unsigned short dr_sw;
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unsigned short dr_hw;
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/* Functional directory */
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unsigned char *directory;
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/* Much of our info comes from here */
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struct nubus_board *board;
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};
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/* This is all NuBus devices (used to find devices later on) */
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extern struct nubus_dev *nubus_devices;
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/* This is all NuBus cards */
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extern struct nubus_board *nubus_boards;
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/* Generic NuBus interface functions, modelled after the PCI interface */
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#ifdef CONFIG_PROC_FS
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void nubus_proc_init(void);
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struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board);
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struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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struct nubus_board *board);
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void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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unsigned int size);
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void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent);
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#else
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static inline void nubus_proc_init(void) {}
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static inline
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struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
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{ return NULL; }
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static inline
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struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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struct nubus_board *board)
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{ return NULL; }
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static inline void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent,
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unsigned int size) {}
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static inline void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
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const struct nubus_dirent *ent) {}
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#endif
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/* If we need more precision we can add some more of these */
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struct nubus_dev *nubus_find_type(unsigned short category,
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unsigned short type,
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const struct nubus_dev *from);
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/* Might have more than one device in a slot, you know... */
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struct nubus_dev *nubus_find_slot(unsigned int slot,
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const struct nubus_dev *from);
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/* These are somewhat more NuBus-specific. They all return 0 for
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success and -1 for failure, as you'd expect. */
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/* The root directory which contains the board and functional
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directories */
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int nubus_get_root_dir(const struct nubus_board *board,
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struct nubus_dir *dir);
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/* The board directory */
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int nubus_get_board_dir(const struct nubus_board *board,
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struct nubus_dir *dir);
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/* The functional directory */
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int nubus_get_func_dir(const struct nubus_dev *dev,
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struct nubus_dir *dir);
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/* These work on any directory gotten via the above */
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int nubus_readdir(struct nubus_dir *dir,
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struct nubus_dirent *ent);
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int nubus_find_rsrc(struct nubus_dir *dir,
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unsigned char rsrc_type,
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struct nubus_dirent *ent);
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int nubus_rewinddir(struct nubus_dir *dir);
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/* Things to do with directory entries */
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int nubus_get_subdir(const struct nubus_dirent *ent,
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struct nubus_dir *dir);
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void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent *dirent,
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unsigned int len);
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unsigned int nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
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unsigned int len);
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void nubus_seq_write_rsrc_mem(struct seq_file *m,
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const struct nubus_dirent *dirent,
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unsigned int len);
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unsigned char *nubus_dirptr(const struct nubus_dirent *nd);
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/* Returns a pointer to the "standard" slot space. */
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static inline void *nubus_slot_addr(int slot)
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{
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return (void *)(0xF0000000 | (slot << 24));
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}
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#endif /* LINUX_NUBUS_H */
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