drivers/nubus/proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* drivers/nubus/proc.c: Proc FS interface for NuBus.
   3
   4    By David Huggins-Daines <dhd@debian.org>
   5
   6    Much code and many ideas from drivers/pci/proc.c:
   7    Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   8
   9    This is initially based on the Zorro and PCI interfaces.  However,
  10    it works somewhat differently.  The intent is to provide a
  11    structure in /proc analogous to the structure of the NuBus ROM
  12    resources.
  13
  14    Therefore each board function gets a directory, which may in turn
  15    contain subdirectories.  Each slot resource is a file.  Unrecognized
  16    resources are empty files, since every resource ID requires a special
  17    case (e.g. if the resource ID implies a directory or block, then its
  18    value has to be interpreted as a slot ROM pointer etc.).
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/nubus.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/uaccess.h>
  30 #include <asm/byteorder.h>
  31
  32 /*
  33  * /proc/bus/nubus/devices stuff
  34  */
  35
  36 static int
  37 nubus_devices_proc_show(struct seq_file *m, void *v)
  38 {
  39         struct nubus_rsrc *fres;
  40
  41         for_each_func_rsrc(fres)
  42                 seq_printf(m, "%x\t%04x %04x %04x %04x\t%08lx\n",
  43                            fres->board->slot, fres->category, fres->type,
  44                            fres->dr_sw, fres->dr_hw, fres->board->slot_addr);
  45         return 0;
  46 }
  47
  48 static struct proc_dir_entry *proc_bus_nubus_dir;
  49
  50 /*
  51  * /proc/bus/nubus/x/ stuff
  52  */
  53
  54 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
  55 {
  56         char name[2];
  57
  58         if (!proc_bus_nubus_dir)
  59                 return NULL;
  60         snprintf(name, sizeof(name), "%x", board->slot);
  61         return proc_mkdir(name, proc_bus_nubus_dir);
  62 }
  63
  64 /* The PDE private data for any directory under /proc/bus/nubus/x/
  65  * is the bytelanes value for the board in slot x.
  66  */
  67
  68 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
  69                                                const struct nubus_dirent *ent,
  70                                                struct nubus_board *board)
  71 {
  72         char name[9];
  73         int lanes = board->lanes;
  74
  75         if (!procdir)
  76                 return NULL;
  77         snprintf(name, sizeof(name), "%x", ent->type);
  78         return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
  79 }
  80
  81 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to
  82  * an instance of the following structure, which gives the location and size
  83  * of the resource data in the slot ROM. For slot resources which hold only a
  84  * small integer, this integer value is stored directly and size is set to 0.
  85  * A NULL private data pointer indicates an unrecognized resource.
  86  */
  87
  88 struct nubus_proc_pde_data {
  89         unsigned char *res_ptr;
  90         unsigned int res_size;
  91 };
  92
  93 static struct nubus_proc_pde_data *
  94 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
  95 {
  96         struct nubus_proc_pde_data *pde_data;
  97
  98         pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
  99         if (!pde_data)
 100                 return NULL;
 101
 102         pde_data->res_ptr = ptr;
 103         pde_data->res_size = size;
 104         return pde_data;
 105 }
 106
 107 static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
 108 {
 109         struct inode *inode = m->private;
 110         struct nubus_proc_pde_data *pde_data;
 111
 112         pde_data = PDE_DATA(inode);
 113         if (!pde_data)
 114                 return 0;
 115
 116         if (pde_data->res_size > m->size)
 117                 return -EFBIG;
 118
 119         if (pde_data->res_size) {
 120                 int lanes = (int)proc_get_parent_data(inode);
 121                 struct nubus_dirent ent;
 122
 123                 if (!lanes)
 124                         return 0;
 125
 126                 ent.mask = lanes;
 127                 ent.base = pde_data->res_ptr;
 128                 ent.data = 0;
 129                 nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
 130         } else {
 131                 unsigned int data = (unsigned int)pde_data->res_ptr;
 132
 133                 seq_putc(m, data >> 16);
 134                 seq_putc(m, data >> 8);
 135                 seq_putc(m, data >> 0);
 136         }
 137         return 0;
 138 }
 139
 140 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
 141                              const struct nubus_dirent *ent,
 142                              unsigned int size)
 143 {
 144         char name[9];
 145         struct nubus_proc_pde_data *pde_data;
 146
 147         if (!procdir)
 148                 return;
 149
 150         snprintf(name, sizeof(name), "%x", ent->type);
 151         if (size)
 152                 pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
 153         else
 154                 pde_data = NULL;
 155         proc_create_single_data(name, S_IFREG | 0444, procdir,
 156                         nubus_proc_rsrc_show, pde_data);
 157 }
 158
 159 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
 160                          const struct nubus_dirent *ent)
 161 {
 162         char name[9];
 163         unsigned char *data = (unsigned char *)ent->data;
 164
 165         if (!procdir)
 166                 return;
 167
 168         snprintf(name, sizeof(name), "%x", ent->type);
 169         proc_create_single_data(name, S_IFREG | 0444, procdir,
 170                         nubus_proc_rsrc_show,
 171                         nubus_proc_alloc_pde_data(data, 0));
 172 }
 173
 174 /*
 175  * /proc/nubus stuff
 176  */
 177
 178 void __init nubus_proc_init(void)
 179 {
 180         proc_create_single("nubus", 0, NULL, nubus_proc_show);
 181         proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
 182         if (!proc_bus_nubus_dir)
 183                 return;
 184         proc_create_single("devices", 0, proc_bus_nubus_dir,
 185                         nubus_devices_proc_show);
 186 }