2 * Linux/SPARC PROM Configuration Driver
3 * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * This character device driver allows user programs to access the
7 * PROM device tree. It is compatible with the SunOS /dev/openprom
8 * driver and the NetBSD /dev/openprom driver. The SunOS eeprom
9 * utility works without any modifications.
11 * The driver uses a minor number under the misc device major. The
12 * file read/write mode determines the type of access to the PROM.
13 * Interrupts are disabled whenever the driver calls into the PROM for
17 /* This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2 of the
20 * License, or (at your option) any later version.
22 * This program is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <linux/module.h>
33 #include <linux/kernel.h>
34 #include <linux/sched.h>
35 #include <linux/errno.h>
36 #include <linux/slab.h>
37 #include <linux/string.h>
38 #include <linux/miscdevice.h>
39 #include <linux/init.h>
41 #include <asm/oplib.h>
43 #include <asm/system.h>
44 #include <asm/uaccess.h>
45 #include <asm/openpromio.h>
47 #include <linux/pci.h>
51 MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost (ecd@skynet.be)");
52 MODULE_DESCRIPTION("OPENPROM Configuration Driver");
53 MODULE_LICENSE("GPL");
54 MODULE_VERSION("1.0");
56 /* Private data kept by the driver for each descriptor. */
57 typedef struct openprom_private_data
59 struct device_node *current_node; /* Current node for SunOS ioctls. */
60 struct device_node *lastnode; /* Last valid node used by BSD ioctls. */
63 /* ID of the PROM node containing all of the EEPROM options. */
64 static struct device_node *options_node;
67 * Copy an openpromio structure into kernel space from user space.
68 * This routine does error checking to make sure that all memory
69 * accesses are within bounds. A pointer to the allocated openpromio
70 * structure will be placed in "*opp_p". Return value is the length
71 * of the user supplied buffer.
73 static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
80 if (get_user(bufsize, &info->oprom_size))
86 /* If the bufsize is too large, just limit it.
87 * Fix from Jason Rappleye.
89 if (bufsize > OPROMMAXPARAM)
90 bufsize = OPROMMAXPARAM;
92 if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
95 if (copy_from_user(&(*opp_p)->oprom_array,
96 &info->oprom_array, bufsize)) {
103 static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
111 if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
114 (*opp_p)->oprom_size = 0;
117 while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
118 if (get_user(c, &info->oprom_array[bufsize])) {
124 (*opp_p)->oprom_array[bufsize++] = c;
134 * Copy an openpromio structure in kernel space back to user space.
136 static int copyout(void __user *info, struct openpromio *opp, int len)
138 if (copy_to_user(info, opp, len))
143 static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
149 !(pval = of_get_property(dp, op->oprom_array, &len)) ||
150 len <= 0 || len > bufsize)
151 return copyout(argp, op, sizeof(int));
153 memcpy(op->oprom_array, pval, len);
154 op->oprom_array[len] = '\0';
155 op->oprom_size = len;
157 return copyout(argp, op, sizeof(int) + bufsize);
160 static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
162 struct property *prop;
166 return copyout(argp, op, sizeof(int));
167 if (op->oprom_array[0] == '\0') {
168 prop = dp->properties;
170 return copyout(argp, op, sizeof(int));
171 len = strlen(prop->name);
173 prop = of_find_property(dp, op->oprom_array, NULL);
177 (len = strlen(prop->next->name)) + 1 > bufsize)
178 return copyout(argp, op, sizeof(int));
183 memcpy(op->oprom_array, prop->name, len);
184 op->oprom_array[len] = '\0';
185 op->oprom_size = ++len;
187 return copyout(argp, op, sizeof(int) + bufsize);
190 static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
192 char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
193 int len = op->oprom_array + bufsize - buf;
195 return of_set_property(options_node, op->oprom_array, buf, len);
198 static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
202 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
204 if (bufsize < sizeof(phandle))
207 ph = *((int *) op->oprom_array);
209 dp = of_find_node_by_phandle(ph);
227 /* Sibling of node zero is the root node. */
228 if (cmd != OPROMNEXT)
231 dp = of_find_node_by_path("/");
238 data->current_node = dp;
239 *((int *) op->oprom_array) = ph;
240 op->oprom_size = sizeof(phandle);
242 return copyout(argp, op, bufsize + sizeof(int));
245 static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
249 if (bufsize >= 2*sizeof(int)) {
251 struct pci_dev *pdev;
252 struct pcidev_cookie *pcp;
253 pdev = pci_find_slot (((int *) op->oprom_array)[0],
254 ((int *) op->oprom_array)[1]);
259 data->current_node = dp;
260 *((int *)op->oprom_array) = dp->node;
261 op->oprom_size = sizeof(int);
262 err = copyout(argp, op, bufsize + sizeof(int));
270 static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
274 dp = of_find_node_by_path(op->oprom_array);
277 data->current_node = dp;
278 *((int *)op->oprom_array) = ph;
279 op->oprom_size = sizeof(int);
281 return copyout(argp, op, bufsize + sizeof(int));
284 static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
286 char *buf = saved_command_line;
287 int len = strlen(buf);
292 strcpy(op->oprom_array, buf);
293 op->oprom_size = len;
295 return copyout(argp, op, bufsize + sizeof(int));
299 * SunOS and Solaris /dev/openprom ioctl calls.
301 static int openprom_sunos_ioctl(struct inode * inode, struct file * file,
302 unsigned int cmd, unsigned long arg,
303 struct device_node *dp)
305 DATA *data = file->private_data;
306 struct openpromio *opp;
307 int bufsize, error = 0;
309 void __user *argp = (void __user *)arg;
311 if (cmd == OPROMSETOPT)
312 bufsize = getstrings(argp, &opp);
314 bufsize = copyin(argp, &opp);
322 error = opromgetprop(argp, dp, opp, bufsize);
327 error = opromnxtprop(argp, dp, opp, bufsize);
332 error = opromsetopt(dp, opp, bufsize);
338 error = opromnext(argp, cmd, dp, opp, bufsize, data);
342 error = oprompci2node(argp, dp, opp, bufsize, data);
346 error = oprompath2node(argp, dp, opp, bufsize, data);
349 case OPROMGETBOOTARGS:
350 error = opromgetbootargs(argp, opp, bufsize);
357 printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
362 printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
371 static struct device_node *get_node(phandle n, DATA *data)
373 struct device_node *dp = of_find_node_by_phandle(n);
381 /* Copy in a whole string from userspace into kernelspace. */
382 static int copyin_string(char __user *user, size_t len, char **ptr)
386 if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
389 tmp = kmalloc(len + 1, GFP_KERNEL);
393 if (copy_from_user(tmp, user, len)) {
406 * NetBSD /dev/openprom ioctl calls.
408 static int opiocget(void __user *argp, DATA *data)
411 struct device_node *dp;
416 if (copy_from_user(&op, argp, sizeof(op)))
419 dp = get_node(op.op_nodeid, data);
421 err = copyin_string(op.op_name, op.op_namelen, &str);
425 pval = of_get_property(dp, str, &len);
427 if (!pval || len > op.op_buflen) {
431 if (copy_to_user(argp, &op, sizeof(op)) ||
432 copy_to_user(op.op_buf, pval, len))
440 static int opiocnextprop(void __user *argp, DATA *data)
443 struct device_node *dp;
444 struct property *prop;
448 if (copy_from_user(&op, argp, sizeof(op)))
451 dp = get_node(op.op_nodeid, data);
455 err = copyin_string(op.op_name, op.op_namelen, &str);
459 if (str[0] == '\0') {
460 prop = dp->properties;
462 prop = of_find_property(dp, str, NULL);
473 if (len > op.op_buflen)
476 if (copy_to_user(argp, &op, sizeof(op)))
480 copy_to_user(op.op_buf, prop->value, len))
486 static int opiocset(void __user *argp, DATA *data)
489 struct device_node *dp;
493 if (copy_from_user(&op, argp, sizeof(op)))
496 dp = get_node(op.op_nodeid, data);
500 err = copyin_string(op.op_name, op.op_namelen, &str);
504 err = copyin_string(op.op_buf, op.op_buflen, &tmp);
510 err = of_set_property(dp, str, tmp, op.op_buflen);
518 static int opiocgetnext(unsigned int cmd, void __user *argp)
520 struct device_node *dp;
523 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
525 if (copy_from_user(&nd, argp, sizeof(phandle)))
529 if (cmd != OPIOCGETNEXT)
531 dp = of_find_node_by_path("/");
533 dp = of_find_node_by_phandle(nd);
536 if (cmd == OPIOCGETNEXT)
544 if (copy_to_user(argp, &nd, sizeof(phandle)))
550 static int openprom_bsd_ioctl(struct inode * inode, struct file * file,
551 unsigned int cmd, unsigned long arg)
553 DATA *data = (DATA *) file->private_data;
554 void __user *argp = (void __user *)arg;
559 err = opiocget(argp, data);
563 err = opiocnextprop(argp, data);
567 err = opiocset(argp, data);
570 case OPIOCGETOPTNODE:
571 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
573 if (copy_to_user(argp, &options_node->node, sizeof(phandle)))
580 err = opiocgetnext(cmd, argp);
593 * Handoff control to the correct ioctl handler.
595 static int openprom_ioctl(struct inode * inode, struct file * file,
596 unsigned int cmd, unsigned long arg)
598 DATA *data = (DATA *) file->private_data;
603 if ((file->f_mode & FMODE_READ) == 0)
605 return openprom_sunos_ioctl(inode, file, cmd, arg,
610 if ((file->f_mode & FMODE_WRITE) == 0)
612 return openprom_sunos_ioctl(inode, file, cmd, arg,
619 if ((file->f_mode & FMODE_READ) == 0)
621 return openprom_sunos_ioctl(inode, file, cmd, arg,
627 case OPROMGETBOOTARGS:
631 if ((file->f_mode & FMODE_READ) == 0)
633 return openprom_sunos_ioctl(inode, file, cmd, arg, NULL);
637 case OPIOCGETOPTNODE:
640 if ((file->f_mode & FMODE_READ) == 0)
642 return openprom_bsd_ioctl(inode,file,cmd,arg);
645 if ((file->f_mode & FMODE_WRITE) == 0)
647 return openprom_bsd_ioctl(inode,file,cmd,arg);
654 static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
660 * SunOS/Solaris only, the NetBSD one's have embedded pointers in
661 * the arg which we'd need to clean up...
675 case OPROMGETBOOTARGS:
679 rval = openprom_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
686 static int openprom_open(struct inode * inode, struct file * file)
690 data = kmalloc(sizeof(DATA), GFP_KERNEL);
694 data->current_node = of_find_node_by_path("/");
695 data->lastnode = data->current_node;
696 file->private_data = (void *) data;
701 static int openprom_release(struct inode * inode, struct file * file)
703 kfree(file->private_data);
707 static const struct file_operations openprom_fops = {
708 .owner = THIS_MODULE,
710 .ioctl = openprom_ioctl,
711 .compat_ioctl = openprom_compat_ioctl,
712 .open = openprom_open,
713 .release = openprom_release,
716 static struct miscdevice openprom_dev = {
717 .minor = SUN_OPENPROM_MINOR,
719 .fops = &openprom_fops,
722 static int __init openprom_init(void)
724 struct device_node *dp;
727 err = misc_register(&openprom_dev);
731 dp = of_find_node_by_path("/");
734 if (!strcmp(dp->name, "options"))
741 misc_deregister(&openprom_dev);
748 static void __exit openprom_cleanup(void)
750 misc_deregister(&openprom_dev);
753 module_init(openprom_init);
754 module_exit(openprom_cleanup);