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 0000000000..30b9751aad
--- /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);