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
nubus_devices_proc_show(struct seq_file * m,void * v)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
nubus_proc_add_board(struct nubus_board * board)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 || !nubus_populate_procfs)
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
nubus_proc_add_rsrc_dir(struct proc_dir_entry * procdir,const struct nubus_dirent * ent,struct nubus_board * board)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 || !nubus_populate_procfs)
76 return NULL;
77 snprintf(name, sizeof(name), "%x", ent->type);
78 remove_proc_subtree(name, procdir);
79 return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
80 }
81
82 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to
83 * an instance of the following structure, which gives the location and size
84 * of the resource data in the slot ROM. For slot resources which hold only a
85 * small integer, this integer value is stored directly and size is set to 0.
86 * A NULL private data pointer indicates an unrecognized resource.
87 */
88
89 struct nubus_proc_pde_data {
90 unsigned char *res_ptr;
91 unsigned int res_size;
92 };
93
94 static struct nubus_proc_pde_data *
nubus_proc_alloc_pde_data(unsigned char * ptr,unsigned int size)95 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
96 {
97 struct nubus_proc_pde_data *pded;
98
99 pded = kmalloc(sizeof(*pded), GFP_KERNEL);
100 if (!pded)
101 return NULL;
102
103 pded->res_ptr = ptr;
104 pded->res_size = size;
105 return pded;
106 }
107
nubus_proc_rsrc_show(struct seq_file * m,void * v)108 static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
109 {
110 struct inode *inode = m->private;
111 struct nubus_proc_pde_data *pded;
112
113 pded = pde_data(inode);
114 if (!pded)
115 return 0;
116
117 if (pded->res_size > m->size)
118 return -EFBIG;
119
120 if (pded->res_size) {
121 int lanes = (int)proc_get_parent_data(inode);
122 struct nubus_dirent ent;
123
124 if (!lanes)
125 return 0;
126
127 ent.mask = lanes;
128 ent.base = pded->res_ptr;
129 ent.data = 0;
130 nubus_seq_write_rsrc_mem(m, &ent, pded->res_size);
131 } else {
132 unsigned int data = (unsigned int)pded->res_ptr;
133
134 seq_putc(m, data >> 16);
135 seq_putc(m, data >> 8);
136 seq_putc(m, data >> 0);
137 }
138 return 0;
139 }
140
nubus_rsrc_proc_open(struct inode * inode,struct file * file)141 static int nubus_rsrc_proc_open(struct inode *inode, struct file *file)
142 {
143 return single_open(file, nubus_proc_rsrc_show, inode);
144 }
145
146 static const struct proc_ops nubus_rsrc_proc_ops = {
147 .proc_open = nubus_rsrc_proc_open,
148 .proc_read = seq_read,
149 .proc_lseek = seq_lseek,
150 .proc_release = single_release,
151 };
152
nubus_proc_add_rsrc_mem(struct proc_dir_entry * procdir,const struct nubus_dirent * ent,unsigned int size)153 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
154 const struct nubus_dirent *ent,
155 unsigned int size)
156 {
157 char name[9];
158 struct nubus_proc_pde_data *pded;
159
160 if (!procdir || !nubus_populate_procfs)
161 return;
162
163 snprintf(name, sizeof(name), "%x", ent->type);
164 if (size)
165 pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
166 else
167 pded = NULL;
168 remove_proc_subtree(name, procdir);
169 proc_create_data(name, S_IFREG | 0444, procdir,
170 &nubus_rsrc_proc_ops, pded);
171 }
172
nubus_proc_add_rsrc(struct proc_dir_entry * procdir,const struct nubus_dirent * ent)173 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
174 const struct nubus_dirent *ent)
175 {
176 char name[9];
177 unsigned char *data = (unsigned char *)ent->data;
178
179 if (!procdir || !nubus_populate_procfs)
180 return;
181
182 snprintf(name, sizeof(name), "%x", ent->type);
183 remove_proc_subtree(name, procdir);
184 proc_create_data(name, S_IFREG | 0444, procdir,
185 &nubus_rsrc_proc_ops,
186 nubus_proc_alloc_pde_data(data, 0));
187 }
188
189 /*
190 * /proc/nubus stuff
191 */
192
nubus_proc_init(void)193 void __init nubus_proc_init(void)
194 {
195 proc_create_single("nubus", 0, NULL, nubus_proc_show);
196 proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
197 if (!proc_bus_nubus_dir)
198 return;
199 proc_create_single("devices", 0, proc_bus_nubus_dir,
200 nubus_devices_proc_show);
201 }
202