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-rw-r--r--drivers/sbus/char/openprom.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/drivers/sbus/char/openprom.c b/drivers/sbus/char/openprom.c
new file mode 100644
index 000000000..30b9751aa
--- /dev/null
+++ b/drivers/sbus/char/openprom.c
@@ -0,0 +1,726 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Linux/SPARC PROM Configuration Driver
+ * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
+ * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
+ *
+ * This character device driver allows user programs to access the
+ * PROM device tree. It is compatible with the SunOS /dev/openprom
+ * driver and the NetBSD /dev/openprom driver. The SunOS eeprom
+ * utility works without any modifications.
+ *
+ * The driver uses a minor number under the misc device major. The
+ * file read/write mode determines the type of access to the PROM.
+ * Interrupts are disabled whenever the driver calls into the PROM for
+ * sanity's sake.
+ */
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/string.h>
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <asm/oplib.h>
+#include <asm/prom.h>
+#include <linux/uaccess.h>
+#include <asm/openpromio.h>
+#ifdef CONFIG_PCI
+#include <linux/pci.h>
+#endif
+
+MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost (ecd@skynet.be)");
+MODULE_DESCRIPTION("OPENPROM Configuration Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+MODULE_ALIAS_MISCDEV(SUN_OPENPROM_MINOR);
+
+/* Private data kept by the driver for each descriptor. */
+typedef struct openprom_private_data
+{
+ struct device_node *current_node; /* Current node for SunOS ioctls. */
+ struct device_node *lastnode; /* Last valid node used by BSD ioctls. */
+} DATA;
+
+/* ID of the PROM node containing all of the EEPROM options. */
+static DEFINE_MUTEX(openprom_mutex);
+static struct device_node *options_node;
+
+/*
+ * Copy an openpromio structure into kernel space from user space.
+ * This routine does error checking to make sure that all memory
+ * accesses are within bounds. A pointer to the allocated openpromio
+ * structure will be placed in "*opp_p". Return value is the length
+ * of the user supplied buffer.
+ */
+static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
+{
+ unsigned int bufsize;
+
+ if (!info || !opp_p)
+ return -EFAULT;
+
+ if (get_user(bufsize, &info->oprom_size))
+ return -EFAULT;
+
+ if (bufsize == 0)
+ return -EINVAL;
+
+ /* If the bufsize is too large, just limit it.
+ * Fix from Jason Rappleye.
+ */
+ if (bufsize > OPROMMAXPARAM)
+ bufsize = OPROMMAXPARAM;
+
+ if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
+ return -ENOMEM;
+
+ if (copy_from_user(&(*opp_p)->oprom_array,
+ &info->oprom_array, bufsize)) {
+ kfree(*opp_p);
+ return -EFAULT;
+ }
+ return bufsize;
+}
+
+static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
+{
+ int n, bufsize;
+ char c;
+
+ if (!info || !opp_p)
+ return -EFAULT;
+
+ if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
+ return -ENOMEM;
+
+ (*opp_p)->oprom_size = 0;
+
+ n = bufsize = 0;
+ while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
+ if (get_user(c, &info->oprom_array[bufsize])) {
+ kfree(*opp_p);
+ return -EFAULT;
+ }
+ if (c == '\0')
+ n++;
+ (*opp_p)->oprom_array[bufsize++] = c;
+ }
+ if (!n) {
+ kfree(*opp_p);
+ return -EINVAL;
+ }
+ return bufsize;
+}
+
+/*
+ * Copy an openpromio structure in kernel space back to user space.
+ */
+static int copyout(void __user *info, struct openpromio *opp, int len)
+{
+ if (copy_to_user(info, opp, len))
+ return -EFAULT;
+ return 0;
+}
+
+static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
+{
+ const void *pval;
+ int len;
+
+ if (!dp ||
+ !(pval = of_get_property(dp, op->oprom_array, &len)) ||
+ len <= 0 || len > bufsize)
+ return copyout(argp, op, sizeof(int));
+
+ memcpy(op->oprom_array, pval, len);
+ op->oprom_array[len] = '\0';
+ op->oprom_size = len;
+
+ return copyout(argp, op, sizeof(int) + bufsize);
+}
+
+static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
+{
+ struct property *prop;
+ int len;
+
+ if (!dp)
+ return copyout(argp, op, sizeof(int));
+ if (op->oprom_array[0] == '\0') {
+ prop = dp->properties;
+ if (!prop)
+ return copyout(argp, op, sizeof(int));
+ len = strlen(prop->name);
+ } else {
+ prop = of_find_property(dp, op->oprom_array, NULL);
+
+ if (!prop ||
+ !prop->next ||
+ (len = strlen(prop->next->name)) + 1 > bufsize)
+ return copyout(argp, op, sizeof(int));
+
+ prop = prop->next;
+ }
+
+ memcpy(op->oprom_array, prop->name, len);
+ op->oprom_array[len] = '\0';
+ op->oprom_size = ++len;
+
+ return copyout(argp, op, sizeof(int) + bufsize);
+}
+
+static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
+{
+ char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
+ int len = op->oprom_array + bufsize - buf;
+
+ return of_set_property(options_node, op->oprom_array, buf, len);
+}
+
+static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
+{
+ phandle ph;
+
+ BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
+
+ if (bufsize < sizeof(phandle))
+ return -EINVAL;
+
+ ph = *((int *) op->oprom_array);
+ if (ph) {
+ dp = of_find_node_by_phandle(ph);
+ if (!dp)
+ return -EINVAL;
+
+ switch (cmd) {
+ case OPROMNEXT:
+ dp = dp->sibling;
+ break;
+
+ case OPROMCHILD:
+ dp = dp->child;
+ break;
+
+ case OPROMSETCUR:
+ default:
+ break;
+ }
+ } else {
+ /* Sibling of node zero is the root node. */
+ if (cmd != OPROMNEXT)
+ return -EINVAL;
+
+ dp = of_find_node_by_path("/");
+ }
+
+ ph = 0;
+ if (dp)
+ ph = dp->phandle;
+
+ data->current_node = dp;
+ *((int *) op->oprom_array) = ph;
+ op->oprom_size = sizeof(phandle);
+
+ return copyout(argp, op, bufsize + sizeof(int));
+}
+
+static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
+{
+ int err = -EINVAL;
+
+ if (bufsize >= 2*sizeof(int)) {
+#ifdef CONFIG_PCI
+ struct pci_dev *pdev;
+ struct device_node *dp;
+
+ pdev = pci_get_domain_bus_and_slot(0,
+ ((int *) op->oprom_array)[0],
+ ((int *) op->oprom_array)[1]);
+
+ dp = pci_device_to_OF_node(pdev);
+ data->current_node = dp;
+ *((int *)op->oprom_array) = dp->phandle;
+ op->oprom_size = sizeof(int);
+ err = copyout(argp, op, bufsize + sizeof(int));
+
+ pci_dev_put(pdev);
+#endif
+ }
+
+ return err;
+}
+
+static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
+{
+ phandle ph = 0;
+
+ dp = of_find_node_by_path(op->oprom_array);
+ if (dp)
+ ph = dp->phandle;
+ data->current_node = dp;
+ *((int *)op->oprom_array) = ph;
+ op->oprom_size = sizeof(int);
+
+ return copyout(argp, op, bufsize + sizeof(int));
+}
+
+static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
+{
+ char *buf = saved_command_line;
+ int len = strlen(buf);
+
+ if (len > bufsize)
+ return -EINVAL;
+
+ strcpy(op->oprom_array, buf);
+ op->oprom_size = len;
+
+ return copyout(argp, op, bufsize + sizeof(int));
+}
+
+/*
+ * SunOS and Solaris /dev/openprom ioctl calls.
+ */
+static long openprom_sunos_ioctl(struct file * file,
+ unsigned int cmd, unsigned long arg,
+ struct device_node *dp)
+{
+ DATA *data = file->private_data;
+ struct openpromio *opp = NULL;
+ int bufsize, error = 0;
+ static int cnt;
+ void __user *argp = (void __user *)arg;
+
+ if (cmd == OPROMSETOPT)
+ bufsize = getstrings(argp, &opp);
+ else
+ bufsize = copyin(argp, &opp);
+
+ if (bufsize < 0)
+ return bufsize;
+
+ mutex_lock(&openprom_mutex);
+
+ switch (cmd) {
+ case OPROMGETOPT:
+ case OPROMGETPROP:
+ error = opromgetprop(argp, dp, opp, bufsize);
+ break;
+
+ case OPROMNXTOPT:
+ case OPROMNXTPROP:
+ error = opromnxtprop(argp, dp, opp, bufsize);
+ break;
+
+ case OPROMSETOPT:
+ case OPROMSETOPT2:
+ error = opromsetopt(dp, opp, bufsize);
+ break;
+
+ case OPROMNEXT:
+ case OPROMCHILD:
+ case OPROMSETCUR:
+ error = opromnext(argp, cmd, dp, opp, bufsize, data);
+ break;
+
+ case OPROMPCI2NODE:
+ error = oprompci2node(argp, dp, opp, bufsize, data);
+ break;
+
+ case OPROMPATH2NODE:
+ error = oprompath2node(argp, dp, opp, bufsize, data);
+ break;
+
+ case OPROMGETBOOTARGS:
+ error = opromgetbootargs(argp, opp, bufsize);
+ break;
+
+ case OPROMU2P:
+ case OPROMGETCONS:
+ case OPROMGETFBNAME:
+ if (cnt++ < 10)
+ printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
+ error = -EINVAL;
+ break;
+ default:
+ if (cnt++ < 10)
+ printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
+ error = -EINVAL;
+ break;
+ }
+
+ kfree(opp);
+ mutex_unlock(&openprom_mutex);
+
+ return error;
+}
+
+static struct device_node *get_node(phandle n, DATA *data)
+{
+ struct device_node *dp = of_find_node_by_phandle(n);
+
+ if (dp)
+ data->lastnode = dp;
+
+ return dp;
+}
+
+/* Copy in a whole string from userspace into kernelspace. */
+static char * copyin_string(char __user *user, size_t len)
+{
+ if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
+ return ERR_PTR(-EINVAL);
+
+ return memdup_user_nul(user, len);
+}
+
+/*
+ * NetBSD /dev/openprom ioctl calls.
+ */
+static int opiocget(void __user *argp, DATA *data)
+{
+ struct opiocdesc op;
+ struct device_node *dp;
+ char *str;
+ const void *pval;
+ int err, len;
+
+ if (copy_from_user(&op, argp, sizeof(op)))
+ return -EFAULT;
+
+ dp = get_node(op.op_nodeid, data);
+
+ str = copyin_string(op.op_name, op.op_namelen);
+ if (IS_ERR(str))
+ return PTR_ERR(str);
+
+ pval = of_get_property(dp, str, &len);
+ err = 0;
+ if (!pval || len > op.op_buflen) {
+ err = -EINVAL;
+ } else {
+ op.op_buflen = len;
+ if (copy_to_user(argp, &op, sizeof(op)) ||
+ copy_to_user(op.op_buf, pval, len))
+ err = -EFAULT;
+ }
+ kfree(str);
+
+ return err;
+}
+
+static int opiocnextprop(void __user *argp, DATA *data)
+{
+ struct opiocdesc op;
+ struct device_node *dp;
+ struct property *prop;
+ char *str;
+ int len;
+
+ if (copy_from_user(&op, argp, sizeof(op)))
+ return -EFAULT;
+
+ dp = get_node(op.op_nodeid, data);
+ if (!dp)
+ return -EINVAL;
+
+ str = copyin_string(op.op_name, op.op_namelen);
+ if (IS_ERR(str))
+ return PTR_ERR(str);
+
+ if (str[0] == '\0') {
+ prop = dp->properties;
+ } else {
+ prop = of_find_property(dp, str, NULL);
+ if (prop)
+ prop = prop->next;
+ }
+ kfree(str);
+
+ if (!prop)
+ len = 0;
+ else
+ len = prop->length;
+
+ if (len > op.op_buflen)
+ len = op.op_buflen;
+
+ if (copy_to_user(argp, &op, sizeof(op)))
+ return -EFAULT;
+
+ if (len &&
+ copy_to_user(op.op_buf, prop->value, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int opiocset(void __user *argp, DATA *data)
+{
+ struct opiocdesc op;
+ struct device_node *dp;
+ char *str, *tmp;
+ int err;
+
+ if (copy_from_user(&op, argp, sizeof(op)))
+ return -EFAULT;
+
+ dp = get_node(op.op_nodeid, data);
+ if (!dp)
+ return -EINVAL;
+
+ str = copyin_string(op.op_name, op.op_namelen);
+ if (IS_ERR(str))
+ return PTR_ERR(str);
+
+ tmp = copyin_string(op.op_buf, op.op_buflen);
+ if (IS_ERR(tmp)) {
+ kfree(str);
+ return PTR_ERR(tmp);
+ }
+
+ err = of_set_property(dp, str, tmp, op.op_buflen);
+
+ kfree(str);
+ kfree(tmp);
+
+ return err;
+}
+
+static int opiocgetnext(unsigned int cmd, void __user *argp)
+{
+ struct device_node *dp;
+ phandle nd;
+
+ BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
+
+ if (copy_from_user(&nd, argp, sizeof(phandle)))
+ return -EFAULT;
+
+ if (nd == 0) {
+ if (cmd != OPIOCGETNEXT)
+ return -EINVAL;
+ dp = of_find_node_by_path("/");
+ } else {
+ dp = of_find_node_by_phandle(nd);
+ nd = 0;
+ if (dp) {
+ if (cmd == OPIOCGETNEXT)
+ dp = dp->sibling;
+ else
+ dp = dp->child;
+ }
+ }
+ if (dp)
+ nd = dp->phandle;
+ if (copy_to_user(argp, &nd, sizeof(phandle)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int openprom_bsd_ioctl(struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ DATA *data = file->private_data;
+ void __user *argp = (void __user *)arg;
+ int err;
+
+ mutex_lock(&openprom_mutex);
+ switch (cmd) {
+ case OPIOCGET:
+ err = opiocget(argp, data);
+ break;
+
+ case OPIOCNEXTPROP:
+ err = opiocnextprop(argp, data);
+ break;
+
+ case OPIOCSET:
+ err = opiocset(argp, data);
+ break;
+
+ case OPIOCGETOPTNODE:
+ BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
+
+ err = 0;
+ if (copy_to_user(argp, &options_node->phandle, sizeof(phandle)))
+ err = -EFAULT;
+ break;
+
+ case OPIOCGETNEXT:
+ case OPIOCGETCHILD:
+ err = opiocgetnext(cmd, argp);
+ break;
+
+ default:
+ err = -EINVAL;
+ break;
+ }
+ mutex_unlock(&openprom_mutex);
+
+ return err;
+}
+
+
+/*
+ * Handoff control to the correct ioctl handler.
+ */
+static long openprom_ioctl(struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ DATA *data = file->private_data;
+
+ switch (cmd) {
+ case OPROMGETOPT:
+ case OPROMNXTOPT:
+ if ((file->f_mode & FMODE_READ) == 0)
+ return -EPERM;
+ return openprom_sunos_ioctl(file, cmd, arg,
+ options_node);
+
+ case OPROMSETOPT:
+ case OPROMSETOPT2:
+ if ((file->f_mode & FMODE_WRITE) == 0)
+ return -EPERM;
+ return openprom_sunos_ioctl(file, cmd, arg,
+ options_node);
+
+ case OPROMNEXT:
+ case OPROMCHILD:
+ case OPROMGETPROP:
+ case OPROMNXTPROP:
+ if ((file->f_mode & FMODE_READ) == 0)
+ return -EPERM;
+ return openprom_sunos_ioctl(file, cmd, arg,
+ data->current_node);
+
+ case OPROMU2P:
+ case OPROMGETCONS:
+ case OPROMGETFBNAME:
+ case OPROMGETBOOTARGS:
+ case OPROMSETCUR:
+ case OPROMPCI2NODE:
+ case OPROMPATH2NODE:
+ if ((file->f_mode & FMODE_READ) == 0)
+ return -EPERM;
+ return openprom_sunos_ioctl(file, cmd, arg, NULL);
+
+ case OPIOCGET:
+ case OPIOCNEXTPROP:
+ case OPIOCGETOPTNODE:
+ case OPIOCGETNEXT:
+ case OPIOCGETCHILD:
+ if ((file->f_mode & FMODE_READ) == 0)
+ return -EBADF;
+ return openprom_bsd_ioctl(file,cmd,arg);
+
+ case OPIOCSET:
+ if ((file->f_mode & FMODE_WRITE) == 0)
+ return -EBADF;
+ return openprom_bsd_ioctl(file,cmd,arg);
+
+ default:
+ return -EINVAL;
+ };
+}
+
+static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ long rval = -ENOTTY;
+
+ /*
+ * SunOS/Solaris only, the NetBSD one's have embedded pointers in
+ * the arg which we'd need to clean up...
+ */
+ switch (cmd) {
+ case OPROMGETOPT:
+ case OPROMSETOPT:
+ case OPROMNXTOPT:
+ case OPROMSETOPT2:
+ case OPROMNEXT:
+ case OPROMCHILD:
+ case OPROMGETPROP:
+ case OPROMNXTPROP:
+ case OPROMU2P:
+ case OPROMGETCONS:
+ case OPROMGETFBNAME:
+ case OPROMGETBOOTARGS:
+ case OPROMSETCUR:
+ case OPROMPCI2NODE:
+ case OPROMPATH2NODE:
+ rval = openprom_ioctl(file, cmd, arg);
+ break;
+ }
+
+ return rval;
+}
+
+static int openprom_open(struct inode * inode, struct file * file)
+{
+ DATA *data;
+
+ data = kmalloc(sizeof(DATA), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ mutex_lock(&openprom_mutex);
+ data->current_node = of_find_node_by_path("/");
+ data->lastnode = data->current_node;
+ file->private_data = (void *) data;
+ mutex_unlock(&openprom_mutex);
+
+ return 0;
+}
+
+static int openprom_release(struct inode * inode, struct file * file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static const struct file_operations openprom_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .unlocked_ioctl = openprom_ioctl,
+ .compat_ioctl = openprom_compat_ioctl,
+ .open = openprom_open,
+ .release = openprom_release,
+};
+
+static struct miscdevice openprom_dev = {
+ .minor = SUN_OPENPROM_MINOR,
+ .name = "openprom",
+ .fops = &openprom_fops,
+};
+
+static int __init openprom_init(void)
+{
+ int err;
+
+ err = misc_register(&openprom_dev);
+ if (err)
+ return err;
+
+ options_node = of_get_child_by_name(of_find_node_by_path("/"), "options");
+ if (!options_node) {
+ misc_deregister(&openprom_dev);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void __exit openprom_cleanup(void)
+{
+ misc_deregister(&openprom_dev);
+}
+
+module_init(openprom_init);
+module_exit(openprom_cleanup);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 11:40:07 +0000