include/linux/nubus.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3   nubus.h: various definitions and prototypes for NuBus drivers to use.
   4
   5   Originally written by Alan Cox.
   6
   7   Hacked to death by C. Scott Ananian and David Huggins-Daines.
   8 */
   9
  10 #ifndef LINUX_NUBUS_H
  11 #define LINUX_NUBUS_H
  12
  13 #include <linux/device.h>
  14 #include <asm/nubus.h>
  15 #include <uapi/linux/nubus.h>
  16
  17 struct proc_dir_entry;
  18 struct seq_file;
  19
  20 struct nubus_dir {
  21         unsigned char *base;
  22         unsigned char *ptr;
  23         int done;
  24         int mask;
  25         struct proc_dir_entry *procdir;
  26 };
  27
  28 struct nubus_dirent {
  29         unsigned char *base;
  30         unsigned char type;
  31         __u32 data;     /* Actually 24 bits used */
  32         int mask;
  33 };
  34
  35 struct nubus_board {
  36         struct device dev;
  37
  38         /* Only 9-E actually exist, though 0-8 are also theoretically
  39            possible, and 0 is a special case which represents the
  40            motherboard and onboard peripherals (Ethernet, video) */
  41         int slot;
  42         /* For slot 0, this is bogus. */
  43         char name[64];
  44
  45         /* Format block */
  46         unsigned char *fblock;
  47         /* Root directory (does *not* always equal fblock + doffset!) */
  48         unsigned char *directory;
  49
  50         unsigned long slot_addr;
  51         /* Offset to root directory (sometimes) */
  52         unsigned long doffset;
  53         /* Length over which to compute the crc */
  54         unsigned long rom_length;
  55         /* Completely useless most of the time */
  56         unsigned long crc;
  57         unsigned char rev;
  58         unsigned char format;
  59         unsigned char lanes;
  60
  61         /* Directory entry in /proc/bus/nubus */
  62         struct proc_dir_entry *procdir;
  63 };
  64
  65 struct nubus_rsrc {
  66         struct list_head list;
  67
  68         /* The functional resource ID */
  69         unsigned char resid;
  70         /* These are mostly here for convenience; we could always read
  71            them from the ROMs if we wanted to */
  72         unsigned short category;
  73         unsigned short type;
  74         unsigned short dr_sw;
  75         unsigned short dr_hw;
  76
  77         /* Functional directory */
  78         unsigned char *directory;
  79         /* Much of our info comes from here */
  80         struct nubus_board *board;
  81 };
  82
  83 /* This is all NuBus functional resources (used to find devices later on) */
  84 extern struct list_head nubus_func_rsrcs;
  85
  86 struct nubus_driver {
  87         struct device_driver driver;
  88         int (*probe)(struct nubus_board *board);
  89         int (*remove)(struct nubus_board *board);
  90 };
  91
  92 extern struct bus_type nubus_bus_type;
  93
  94 /* Generic NuBus interface functions, modelled after the PCI interface */
  95 #ifdef CONFIG_PROC_FS
  96 void nubus_proc_init(void);
  97 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board);
  98 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
  99                                                const struct nubus_dirent *ent,
 100                                                struct nubus_board *board);
 101 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
 102                              const struct nubus_dirent *ent,
 103                              unsigned int size);
 104 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
 105                          const struct nubus_dirent *ent);
 106 #else
 107 static inline void nubus_proc_init(void) {}
 108 static inline
 109 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
 110 { return NULL; }
 111 static inline
 112 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
 113                                                const struct nubus_dirent *ent,
 114                                                struct nubus_board *board)
 115 { return NULL; }
 116 static inline void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
 117                                            const struct nubus_dirent *ent,
 118                                            unsigned int size) {}
 119 static inline void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
 120                                        const struct nubus_dirent *ent) {}
 121 #endif
 122
 123 struct nubus_rsrc *nubus_first_rsrc_or_null(void);
 124 struct nubus_rsrc *nubus_next_rsrc_or_null(struct nubus_rsrc *from);
 125
 126 #define for_each_func_rsrc(f) \
 127         for (f = nubus_first_rsrc_or_null(); f; f = nubus_next_rsrc_or_null(f))
 128
 129 #define for_each_board_func_rsrc(b, f) \
 130         for_each_func_rsrc(f) if (f->board != b) {} else
 131
 132 /* These are somewhat more NuBus-specific.  They all return 0 for
 133    success and -1 for failure, as you'd expect. */
 134
 135 /* The root directory which contains the board and functional
 136    directories */
 137 int nubus_get_root_dir(const struct nubus_board *board,
 138                        struct nubus_dir *dir);
 139 /* The board directory */
 140 int nubus_get_board_dir(const struct nubus_board *board,
 141                         struct nubus_dir *dir);
 142 /* The functional directory */
 143 int nubus_get_func_dir(const struct nubus_rsrc *fres, struct nubus_dir *dir);
 144
 145 /* These work on any directory gotten via the above */
 146 int nubus_readdir(struct nubus_dir *dir,
 147                   struct nubus_dirent *ent);
 148 int nubus_find_rsrc(struct nubus_dir *dir,
 149                     unsigned char rsrc_type,
 150                     struct nubus_dirent *ent);
 151 int nubus_rewinddir(struct nubus_dir *dir);
 152
 153 /* Things to do with directory entries */
 154 int nubus_get_subdir(const struct nubus_dirent *ent,
 155                      struct nubus_dir *dir);
 156 void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent *dirent,
 157                         unsigned int len);
 158 unsigned int nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
 159                                 unsigned int len);
 160 void nubus_seq_write_rsrc_mem(struct seq_file *m,
 161                               const struct nubus_dirent *dirent,
 162                               unsigned int len);
 163 unsigned char *nubus_dirptr(const struct nubus_dirent *nd);
 164
 165 /* Declarations relating to driver model objects */
 166 int nubus_parent_device_register(void);
 167 int nubus_device_register(struct nubus_board *board);
 168 int nubus_driver_register(struct nubus_driver *ndrv);
 169 void nubus_driver_unregister(struct nubus_driver *ndrv);
 170 int nubus_proc_show(struct seq_file *m, void *data);
 171
 172 static inline void nubus_set_drvdata(struct nubus_board *board, void *data)
 173 {
 174         dev_set_drvdata(&board->dev, data);
 175 }
 176
 177 static inline void *nubus_get_drvdata(struct nubus_board *board)
 178 {
 179         return dev_get_drvdata(&board->dev);
 180 }
 181
 182 /* Returns a pointer to the "standard" slot space. */
 183 static inline void *nubus_slot_addr(int slot)
 184 {
 185         return (void *)(0xF0000000 | (slot << 24));
 186 }
 187
 188 #endif /* LINUX_NUBUS_H */