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, fmt: "%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 || !nubus_populate_procfs) |
59 | return NULL; |
60 | snprintf(buf: name, size: sizeof(name), fmt: "%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 || !nubus_populate_procfs) |
76 | return NULL; |
77 | snprintf(buf: name, size: sizeof(name), fmt: "%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 * |
95 | nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) |
96 | { |
97 | struct nubus_proc_pde_data *pded; |
98 | |
99 | pded = kmalloc(size: 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 | |
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, dirent: &ent, len: pded->res_size); |
131 | } else { |
132 | unsigned int data = (unsigned int)pded->res_ptr; |
133 | |
134 | seq_putc(m, c: data >> 16); |
135 | seq_putc(m, c: data >> 8); |
136 | seq_putc(m, c: data >> 0); |
137 | } |
138 | return 0; |
139 | } |
140 | |
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 | |
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(buf: name, size: sizeof(name), fmt: "%x" , ent->type); |
164 | if (size) |
165 | pded = nubus_proc_alloc_pde_data(ptr: nubus_dirptr(nd: 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 | |
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(buf: name, size: sizeof(name), fmt: "%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(ptr: data, size: 0)); |
187 | } |
188 | |
189 | /* |
190 | * /proc/nubus stuff |
191 | */ |
192 | |
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 | |