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)
148 pval = of_get_property(dp, op->oprom_array, &len);
149 if (!pval || len <= 0 || len > bufsize)
150 return copyout(argp, op, sizeof(int));
152 memcpy(op->oprom_array, pval, len);
153 op->oprom_array[len] = '\0';
154 op->oprom_size = len;
156 return copyout(argp, op, sizeof(int) + bufsize);
159 static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
161 struct property *prop;
164 if (op->oprom_array[0] == '\0') {
165 prop = dp->properties;
167 return copyout(argp, op, sizeof(int));
168 len = strlen(prop->name);
170 prop = of_find_property(dp, op->oprom_array, NULL);
174 (len = strlen(prop->next->name)) + 1 > bufsize)
175 return copyout(argp, op, sizeof(int));
180 memcpy(op->oprom_array, prop->name, len);
181 op->oprom_array[len] = '\0';
182 op->oprom_size = ++len;
184 return copyout(argp, op, sizeof(int) + bufsize);
187 static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
189 char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
190 int len = op->oprom_array + bufsize - buf;
192 return of_set_property(options_node, op->oprom_array, buf, len);
195 static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
199 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
201 if (bufsize < sizeof(phandle))
204 ph = *((int *) op->oprom_array);
206 dp = of_find_node_by_phandle(ph);
224 /* Sibling of node zero is the root node. */
225 if (cmd != OPROMNEXT)
228 dp = of_find_node_by_path("/");
235 data->current_node = dp;
236 *((int *) op->oprom_array) = ph;
237 op->oprom_size = sizeof(phandle);
239 return copyout(argp, op, bufsize + sizeof(int));
242 static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
246 if (bufsize >= 2*sizeof(int)) {
248 struct pci_dev *pdev;
249 struct pcidev_cookie *pcp;
250 pdev = pci_find_slot (((int *) op->oprom_array)[0],
251 ((int *) op->oprom_array)[1]);
256 data->current_node = dp;
257 *((int *)op->oprom_array) = dp->node;
258 op->oprom_size = sizeof(int);
259 err = copyout(argp, op, bufsize + sizeof(int));
267 static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
269 dp = of_find_node_by_path(op->oprom_array);
270 data->current_node = dp;
271 *((int *)op->oprom_array) = dp->node;
272 op->oprom_size = sizeof(int);
274 return copyout(argp, op, bufsize + sizeof(int));
277 static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
279 char *buf = saved_command_line;
280 int len = strlen(buf);
285 strcpy(op->oprom_array, buf);
286 op->oprom_size = len;
288 return copyout(argp, op, bufsize + sizeof(int));
292 * SunOS and Solaris /dev/openprom ioctl calls.
294 static int openprom_sunos_ioctl(struct inode * inode, struct file * file,
295 unsigned int cmd, unsigned long arg,
296 struct device_node *dp)
298 DATA *data = file->private_data;
299 struct openpromio *opp;
300 int bufsize, error = 0;
302 void __user *argp = (void __user *)arg;
304 if (cmd == OPROMSETOPT)
305 bufsize = getstrings(argp, &opp);
307 bufsize = copyin(argp, &opp);
315 error = opromgetprop(argp, dp, opp, bufsize);
320 error = opromnxtprop(argp, dp, opp, bufsize);
325 error = opromsetopt(dp, opp, bufsize);
331 error = opromnext(argp, cmd, dp, opp, bufsize, data);
335 error = oprompci2node(argp, dp, opp, bufsize, data);
339 error = oprompath2node(argp, dp, opp, bufsize, data);
342 case OPROMGETBOOTARGS:
343 error = opromgetbootargs(argp, opp, bufsize);
350 printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
355 printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
364 static struct device_node *get_node(phandle n, DATA *data)
366 struct device_node *dp = of_find_node_by_phandle(n);
374 /* Copy in a whole string from userspace into kernelspace. */
375 static int copyin_string(char __user *user, size_t len, char **ptr)
379 if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
382 tmp = kmalloc(len + 1, GFP_KERNEL);
386 if (copy_from_user(tmp, user, len)) {
399 * NetBSD /dev/openprom ioctl calls.
401 static int opiocget(void __user *argp, DATA *data)
404 struct device_node *dp;
409 if (copy_from_user(&op, argp, sizeof(op)))
412 dp = get_node(op.op_nodeid, data);
414 err = copyin_string(op.op_name, op.op_namelen, &str);
418 pval = of_get_property(dp, str, &len);
420 if (!pval || len > op.op_buflen) {
424 if (copy_to_user(argp, &op, sizeof(op)) ||
425 copy_to_user(op.op_buf, pval, len))
433 static int opiocnextprop(void __user *argp, DATA *data)
436 struct device_node *dp;
437 struct property *prop;
441 if (copy_from_user(&op, argp, sizeof(op)))
444 dp = get_node(op.op_nodeid, data);
448 err = copyin_string(op.op_name, op.op_namelen, &str);
452 if (str[0] == '\0') {
453 prop = dp->properties;
455 prop = of_find_property(dp, str, NULL);
466 if (len > op.op_buflen)
469 if (copy_to_user(argp, &op, sizeof(op)))
473 copy_to_user(op.op_buf, prop->value, len))
479 static int opiocset(void __user *argp, DATA *data)
482 struct device_node *dp;
486 if (copy_from_user(&op, argp, sizeof(op)))
489 dp = get_node(op.op_nodeid, data);
493 err = copyin_string(op.op_name, op.op_namelen, &str);
497 err = copyin_string(op.op_buf, op.op_buflen, &tmp);
503 err = of_set_property(dp, str, tmp, op.op_buflen);
511 static int opiocgetnext(unsigned int cmd, void __user *argp)
513 struct device_node *dp;
516 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
518 if (copy_from_user(&nd, argp, sizeof(phandle)))
522 if (cmd != OPIOCGETNEXT)
524 dp = of_find_node_by_path("/");
526 dp = of_find_node_by_phandle(nd);
529 if (cmd == OPIOCGETNEXT)
537 if (copy_to_user(argp, &nd, sizeof(phandle)))
543 static int openprom_bsd_ioctl(struct inode * inode, struct file * file,
544 unsigned int cmd, unsigned long arg)
546 DATA *data = (DATA *) file->private_data;
547 void __user *argp = (void __user *)arg;
552 err = opiocget(argp, data);
556 err = opiocnextprop(argp, data);
560 err = opiocset(argp, data);
563 case OPIOCGETOPTNODE:
564 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
566 if (copy_to_user(argp, &options_node->node, sizeof(phandle)))
573 err = opiocgetnext(cmd, argp);
586 * Handoff control to the correct ioctl handler.
588 static int openprom_ioctl(struct inode * inode, struct file * file,
589 unsigned int cmd, unsigned long arg)
591 DATA *data = (DATA *) file->private_data;
596 if ((file->f_mode & FMODE_READ) == 0)
598 return openprom_sunos_ioctl(inode, file, cmd, arg,
603 if ((file->f_mode & FMODE_WRITE) == 0)
605 return openprom_sunos_ioctl(inode, file, cmd, arg,
612 if ((file->f_mode & FMODE_READ) == 0)
614 return openprom_sunos_ioctl(inode, file, cmd, arg,
620 case OPROMGETBOOTARGS:
624 if ((file->f_mode & FMODE_READ) == 0)
626 return openprom_sunos_ioctl(inode, file, cmd, arg, 0);
630 case OPIOCGETOPTNODE:
633 if ((file->f_mode & FMODE_READ) == 0)
635 return openprom_bsd_ioctl(inode,file,cmd,arg);
638 if ((file->f_mode & FMODE_WRITE) == 0)
640 return openprom_bsd_ioctl(inode,file,cmd,arg);
647 static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
653 * SunOS/Solaris only, the NetBSD one's have embedded pointers in
654 * the arg which we'd need to clean up...
668 case OPROMGETBOOTARGS:
672 rval = openprom_ioctl(file->f_dentry->d_inode, file, cmd, arg);
679 static int openprom_open(struct inode * inode, struct file * file)
683 data = kmalloc(sizeof(DATA), GFP_KERNEL);
687 data->current_node = of_find_node_by_path("/");
688 data->lastnode = data->current_node;
689 file->private_data = (void *) data;
694 static int openprom_release(struct inode * inode, struct file * file)
696 kfree(file->private_data);
700 static struct file_operations openprom_fops = {
701 .owner = THIS_MODULE,
703 .ioctl = openprom_ioctl,
704 .compat_ioctl = openprom_compat_ioctl,
705 .open = openprom_open,
706 .release = openprom_release,
709 static struct miscdevice openprom_dev = {
710 .minor = SUN_OPENPROM_MINOR,
712 .fops = &openprom_fops,
715 static int __init openprom_init(void)
717 struct device_node *dp;
720 err = misc_register(&openprom_dev);
724 dp = of_find_node_by_path("/");
727 if (!strcmp(dp->name, "options"))
734 misc_deregister(&openprom_dev);
741 static void __exit openprom_cleanup(void)
743 misc_deregister(&openprom_dev);
746 module_init(openprom_init);
747 module_exit(openprom_cleanup);