1 // SPDX-License-Identifier: GPL-2.0
2 /* drivers/nubus/proc.c: Proc FS interface for NuBus.
4 By David Huggins-Daines <dhd@debian.org>
6 Much code and many ideas from drivers/pci/proc.c:
7 Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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
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.).
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>
33 * /proc/bus/nubus/devices stuff
37 nubus_devices_proc_show(struct seq_file *m, void *v)
39 struct nubus_rsrc *fres;
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);
48 static int nubus_devices_proc_open(struct inode *inode, struct file *file)
50 return single_open(file, nubus_devices_proc_show, NULL);
53 static const struct file_operations nubus_devices_proc_fops = {
54 .open = nubus_devices_proc_open,
57 .release = single_release,
60 static struct proc_dir_entry *proc_bus_nubus_dir;
63 * /proc/bus/nubus/x/ stuff
66 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
70 if (!proc_bus_nubus_dir)
72 snprintf(name, sizeof(name), "%x", board->slot);
73 return proc_mkdir(name, proc_bus_nubus_dir);
76 /* The PDE private data for any directory under /proc/bus/nubus/x/
77 * is the bytelanes value for the board in slot x.
80 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
81 const struct nubus_dirent *ent,
82 struct nubus_board *board)
85 int lanes = board->lanes;
89 snprintf(name, sizeof(name), "%x", ent->type);
90 return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
93 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to
94 * an instance of the following structure, which gives the location and size
95 * of the resource data in the slot ROM. For slot resources which hold only a
96 * small integer, this integer value is stored directly and size is set to 0.
97 * A NULL private data pointer indicates an unrecognized resource.
100 struct nubus_proc_pde_data {
101 unsigned char *res_ptr;
102 unsigned int res_size;
105 static struct nubus_proc_pde_data *
106 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
108 struct nubus_proc_pde_data *pde_data;
110 pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
114 pde_data->res_ptr = ptr;
115 pde_data->res_size = size;
119 static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
121 struct inode *inode = m->private;
122 struct nubus_proc_pde_data *pde_data;
124 pde_data = PDE_DATA(inode);
128 if (pde_data->res_size > m->size)
131 if (pde_data->res_size) {
132 int lanes = (int)proc_get_parent_data(inode);
133 struct nubus_dirent ent;
139 ent.base = pde_data->res_ptr;
141 nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
143 unsigned int data = (unsigned int)pde_data->res_ptr;
145 seq_putc(m, data >> 16);
146 seq_putc(m, data >> 8);
147 seq_putc(m, data >> 0);
152 static int nubus_proc_rsrc_open(struct inode *inode, struct file *file)
154 return single_open(file, nubus_proc_rsrc_show, inode);
157 static const struct file_operations nubus_proc_rsrc_fops = {
158 .open = nubus_proc_rsrc_open,
161 .release = single_release,
164 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
165 const struct nubus_dirent *ent,
169 struct nubus_proc_pde_data *pde_data;
174 snprintf(name, sizeof(name), "%x", ent->type);
176 pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
179 proc_create_data(name, S_IFREG | 0444, procdir,
180 &nubus_proc_rsrc_fops, pde_data);
183 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
184 const struct nubus_dirent *ent)
187 unsigned char *data = (unsigned char *)ent->data;
192 snprintf(name, sizeof(name), "%x", ent->type);
193 proc_create_data(name, S_IFREG | 0444, procdir,
194 &nubus_proc_rsrc_fops,
195 nubus_proc_alloc_pde_data(data, 0));
202 static int nubus_proc_open(struct inode *inode, struct file *file)
204 return single_open(file, nubus_proc_show, NULL);
207 static const struct file_operations nubus_proc_fops = {
208 .open = nubus_proc_open,
211 .release = single_release,
214 void __init nubus_proc_init(void)
216 proc_create("nubus", 0, NULL, &nubus_proc_fops);
217 proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
218 if (!proc_bus_nubus_dir)
220 proc_create("devices", 0, proc_bus_nubus_dir, &nubus_devices_proc_fops);