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 struct proc_dir_entry *proc_bus_nubus_dir;
51 * /proc/bus/nubus/x/ stuff
54 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
58 if (!proc_bus_nubus_dir)
60 snprintf(name, sizeof(name), "%x", board->slot);
61 return proc_mkdir(name, proc_bus_nubus_dir);
64 /* The PDE private data for any directory under /proc/bus/nubus/x/
65 * is the bytelanes value for the board in slot x.
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)
73 int lanes = board->lanes;
77 snprintf(name, sizeof(name), "%x", ent->type);
78 return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
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.
88 struct nubus_proc_pde_data {
89 unsigned char *res_ptr;
90 unsigned int res_size;
93 static struct nubus_proc_pde_data *
94 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
96 struct nubus_proc_pde_data *pde_data;
98 pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
102 pde_data->res_ptr = ptr;
103 pde_data->res_size = size;
107 static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
109 struct inode *inode = m->private;
110 struct nubus_proc_pde_data *pde_data;
112 pde_data = PDE_DATA(inode);
116 if (pde_data->res_size > m->size)
119 if (pde_data->res_size) {
120 int lanes = (int)proc_get_parent_data(inode);
121 struct nubus_dirent ent;
127 ent.base = pde_data->res_ptr;
129 nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
131 unsigned int data = (unsigned int)pde_data->res_ptr;
133 seq_putc(m, data >> 16);
134 seq_putc(m, data >> 8);
135 seq_putc(m, data >> 0);
140 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
141 const struct nubus_dirent *ent,
145 struct nubus_proc_pde_data *pde_data;
150 snprintf(name, sizeof(name), "%x", ent->type);
152 pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
155 proc_create_single_data(name, S_IFREG | 0444, procdir,
156 nubus_proc_rsrc_show, pde_data);
159 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
160 const struct nubus_dirent *ent)
163 unsigned char *data = (unsigned char *)ent->data;
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));
178 void __init nubus_proc_init(void)
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)
184 proc_create_single("devices", 0, proc_bus_nubus_dir,
185 nubus_devices_proc_show);