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// SPDX-License-Identifier: GPL-2.0
/* drivers/nubus/proc.c: Proc FS interface for NuBus.
By David Huggins-Daines <dhd@debian.org>
Much code and many ideas from drivers/pci/proc.c:
Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
This is initially based on the Zorro and PCI interfaces. However,
it works somewhat differently. The intent is to provide a
structure in /proc analogous to the structure of the NuBus ROM
resources.
Therefore each board function gets a directory, which may in turn
contain subdirectories. Each slot resource is a file. Unrecognized
resources are empty files, since every resource ID requires a special
case (e.g. if the resource ID implies a directory or block, then its
value has to be interpreted as a slot ROM pointer etc.).
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/nubus.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
/*
* /proc/bus/nubus/devices stuff
*/
static int
nubus_devices_proc_show(struct seq_file *m, void *v)
{
struct nubus_rsrc *fres;
for_each_func_rsrc(fres)
seq_printf(m, "%x\t%04x %04x %04x %04x\t%08lx\n",
fres->board->slot, fres->category, fres->type,
fres->dr_sw, fres->dr_hw, fres->board->slot_addr);
return 0;
}
static struct proc_dir_entry *proc_bus_nubus_dir;
/*
* /proc/bus/nubus/x/ stuff
*/
struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board)
{
char name[2];
if (!proc_bus_nubus_dir || !nubus_populate_procfs)
return NULL;
snprintf(name, sizeof(name), "%x", board->slot);
return proc_mkdir(name, proc_bus_nubus_dir);
}
/* The PDE private data for any directory under /proc/bus/nubus/x/
* is the bytelanes value for the board in slot x.
*/
struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
struct nubus_board *board)
{
char name[9];
int lanes = board->lanes;
if (!procdir || !nubus_populate_procfs)
return NULL;
snprintf(name, sizeof(name), "%x", ent->type);
remove_proc_subtree(name, procdir);
return proc_mkdir_data(name, 0555, procdir, (void *)lanes);
}
/* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to
* an instance of the following structure, which gives the location and size
* of the resource data in the slot ROM. For slot resources which hold only a
* small integer, this integer value is stored directly and size is set to 0.
* A NULL private data pointer indicates an unrecognized resource.
*/
struct nubus_proc_pde_data {
unsigned char *res_ptr;
unsigned int res_size;
};
static struct nubus_proc_pde_data *
nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
{
struct nubus_proc_pde_data *pded;
pded = kmalloc(sizeof(*pded), GFP_KERNEL);
if (!pded)
return NULL;
pded->res_ptr = ptr;
pded->res_size = size;
return pded;
}
static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
struct nubus_proc_pde_data *pded;
pded = pde_data(inode);
if (!pded)
return 0;
if (pded->res_size > m->size)
return -EFBIG;
if (pded->res_size) {
int lanes = (int)proc_get_parent_data(inode);
struct nubus_dirent ent;
if (!lanes)
return 0;
ent.mask = lanes;
ent.base = pded->res_ptr;
ent.data = 0;
nubus_seq_write_rsrc_mem(m, &ent, pded->res_size);
} else {
unsigned int data = (unsigned int)pded->res_ptr;
seq_putc(m, data >> 16);
seq_putc(m, data >> 8);
seq_putc(m, data >> 0);
}
return 0;
}
static int nubus_rsrc_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, nubus_proc_rsrc_show, inode);
}
static const struct proc_ops nubus_rsrc_proc_ops = {
.proc_open = nubus_rsrc_proc_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
};
void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent,
unsigned int size)
{
char name[9];
struct nubus_proc_pde_data *pded;
if (!procdir || !nubus_populate_procfs)
return;
snprintf(name, sizeof(name), "%x", ent->type);
if (size)
pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
else
pded = NULL;
remove_proc_subtree(name, procdir);
proc_create_data(name, S_IFREG | 0444, procdir,
&nubus_rsrc_proc_ops, pded);
}
void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
const struct nubus_dirent *ent)
{
char name[9];
unsigned char *data = (unsigned char *)ent->data;
if (!procdir || !nubus_populate_procfs)
return;
snprintf(name, sizeof(name), "%x", ent->type);
remove_proc_subtree(name, procdir);
proc_create_data(name, S_IFREG | 0444, procdir,
&nubus_rsrc_proc_ops,
nubus_proc_alloc_pde_data(data, 0));
}
/*
* /proc/nubus stuff
*/
void __init nubus_proc_init(void)
{
proc_create_single("nubus", 0, NULL, nubus_proc_show);
proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL);
if (!proc_bus_nubus_dir)
return;
proc_create_single("devices", 0, proc_bus_nubus_dir,
nubus_devices_proc_show);
}
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