Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1204 insertions, 0 deletions

diff --git a/drivers/nubus/Makefile b/drivers/nubus/Makefile
new file mode 100644
index 000000000..0f03032d2
--- /dev/null
+++ b/drivers/nubus/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the nubus specific drivers.
+#
+
+obj-y := nubus.o bus.o
+
+obj-$(CONFIG_PROC_FS) += proc.o
diff --git a/drivers/nubus/bus.c b/drivers/nubus/bus.c
new file mode 100644
index 000000000..17fad6600
--- /dev/null
+++ b/drivers/nubus/bus.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Bus implementation for the NuBus subsystem.
+//
+// Copyright (C) 2017 Finn Thain
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/nubus.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+
+#define to_nubus_board(d)       container_of(d, struct nubus_board, dev)
+#define to_nubus_driver(d)      container_of(d, struct nubus_driver, driver)
+
+static int nubus_bus_match(struct device *dev, struct device_driver *driver)
+{
+	return 1;
+}
+
+static int nubus_device_probe(struct device *dev)
+{
+	struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
+	int err = -ENODEV;
+
+	if (ndrv->probe)
+		err = ndrv->probe(to_nubus_board(dev));
+	return err;
+}
+
+static void nubus_device_remove(struct device *dev)
+{
+	struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
+
+	if (ndrv->remove)
+		ndrv->remove(to_nubus_board(dev));
+}
+
+struct bus_type nubus_bus_type = {
+	.name		= "nubus",
+	.match		= nubus_bus_match,
+	.probe		= nubus_device_probe,
+	.remove		= nubus_device_remove,
+};
+EXPORT_SYMBOL(nubus_bus_type);
+
+int nubus_driver_register(struct nubus_driver *ndrv)
+{
+	ndrv->driver.bus = &nubus_bus_type;
+	return driver_register(&ndrv->driver);
+}
+EXPORT_SYMBOL(nubus_driver_register);
+
+void nubus_driver_unregister(struct nubus_driver *ndrv)
+{
+	driver_unregister(&ndrv->driver);
+}
+EXPORT_SYMBOL(nubus_driver_unregister);
+
+static struct device nubus_parent = {
+	.init_name	= "nubus",
+};
+
+static int __init nubus_bus_register(void)
+{
+	return bus_register(&nubus_bus_type);
+}
+postcore_initcall(nubus_bus_register);
+
+int __init nubus_parent_device_register(void)
+{
+	return device_register(&nubus_parent);
+}
+
+static void nubus_device_release(struct device *dev)
+{
+	struct nubus_board *board = to_nubus_board(dev);
+	struct nubus_rsrc *fres, *tmp;
+
+	list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list)
+		if (fres->board == board) {
+			list_del(&fres->list);
+			kfree(fres);
+		}
+	kfree(board);
+}
+
+int nubus_device_register(struct nubus_board *board)
+{
+	board->dev.parent = &nubus_parent;
+	board->dev.release = nubus_device_release;
+	board->dev.bus = &nubus_bus_type;
+	dev_set_name(&board->dev, "slot.%X", board->slot);
+	board->dev.dma_mask = &board->dev.coherent_dma_mask;
+	dma_set_mask(&board->dev, DMA_BIT_MASK(32));
+	return device_register(&board->dev);
+}
+
+static int nubus_print_device_name_fn(struct device *dev, void *data)
+{
+	struct nubus_board *board = to_nubus_board(dev);
+	struct seq_file *m = data;
+
+	seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
+	return 0;
+}
+
+int nubus_proc_show(struct seq_file *m, void *data)
+{
+	return bus_for_each_dev(&nubus_bus_type, NULL, m,
+				nubus_print_device_name_fn);
+}
diff --git a/drivers/nubus/nubus.c b/drivers/nubus/nubus.c
new file mode 100644
index 000000000..f70ba58db
--- /dev/null
+++ b/drivers/nubus/nubus.c
@@ -0,0 +1,885 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	Macintosh Nubus Interface Code
+ *
+ *      Originally by Alan Cox
+ *
+ *      Mostly rewritten by David Huggins-Daines, C. Scott Ananian,
+ *      and others.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/nubus.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <asm/setup.h>
+#include <asm/page.h>
+#include <asm/hwtest.h>
+
+/* Constants */
+
+/* This is, of course, the size in bytelanes, rather than the size in
+   actual bytes */
+#define FORMAT_BLOCK_SIZE 20
+#define ROM_DIR_OFFSET 0x24
+
+#define NUBUS_TEST_PATTERN 0x5A932BC7
+
+/* Globals */
+
+LIST_HEAD(nubus_func_rsrcs);
+
+/* Meaning of "bytelanes":
+
+   The card ROM may appear on any or all bytes of each long word in
+   NuBus memory.  The low 4 bits of the "map" value found in the
+   format block (at the top of the slot address space, as well as at
+   the top of the MacOS ROM) tells us which bytelanes, i.e. which byte
+   offsets within each longword, are valid.  Thus:
+
+   A map of 0x0f, as found in the MacOS ROM, means that all bytelanes
+   are valid.
+
+   A map of 0xf0 means that no bytelanes are valid (We pray that we
+   will never encounter this, but stranger things have happened)
+
+   A map of 0xe1 means that only the MSB of each long word is actually
+   part of the card ROM.  (We hope to never encounter NuBus on a
+   little-endian machine.  Again, stranger things have happened)
+
+   A map of 0x78 means that only the LSB of each long word is valid.
+
+   Etcetera, etcetera.  Hopefully this clears up some confusion over
+   what the following code actually does.  */
+
+static inline int not_useful(void *p, int map)
+{
+	unsigned long pv = (unsigned long)p;
+
+	pv &= 3;
+	if (map & (1 << pv))
+		return 0;
+	return 1;
+}
+
+static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map)
+{
+	/* This will hold the result */
+	unsigned long v = 0;
+	unsigned char *p = *ptr;
+
+	while (len) {
+		v <<= 8;
+		while (not_useful(p, map))
+			p++;
+		v |= *p++;
+		len--;
+	}
+	*ptr = p;
+	return v;
+}
+
+static void nubus_rewind(unsigned char **ptr, int len, int map)
+{
+	unsigned char *p = *ptr;
+
+	while (len) {
+		do {
+			p--;
+		} while (not_useful(p, map));
+		len--;
+	}
+	*ptr = p;
+}
+
+static void nubus_advance(unsigned char **ptr, int len, int map)
+{
+	unsigned char *p = *ptr;
+
+	while (len) {
+		while (not_useful(p, map))
+			p++;
+		p++;
+		len--;
+	}
+	*ptr = p;
+}
+
+static void nubus_move(unsigned char **ptr, int len, int map)
+{
+	unsigned long slot_space = (unsigned long)*ptr & 0xFF000000;
+
+	if (len > 0)
+		nubus_advance(ptr, len, map);
+	else if (len < 0)
+		nubus_rewind(ptr, -len, map);
+
+	if (((unsigned long)*ptr & 0xFF000000) != slot_space)
+		pr_err("%s: moved out of slot address space!\n", __func__);
+}
+
+/* Now, functions to read the sResource tree */
+
+/* Each sResource entry consists of a 1-byte ID and a 3-byte data
+   field.  If that data field contains an offset, then obviously we
+   have to expand it from a 24-bit signed number to a 32-bit signed
+   number. */
+
+static inline long nubus_expand32(long foo)
+{
+	if (foo & 0x00800000)	/* 24bit negative */
+		foo |= 0xFF000000;
+	return foo;
+}
+
+static inline void *nubus_rom_addr(int slot)
+{
+	/*
+	 *	Returns the first byte after the card. We then walk
+	 *	backwards to get the lane register and the config
+	 */
+	return (void *)(0xF1000000 + (slot << 24));
+}
+
+unsigned char *nubus_dirptr(const struct nubus_dirent *nd)
+{
+	unsigned char *p = nd->base;
+
+	/* Essentially, just step over the bytelanes using whatever
+	   offset we might have found */
+	nubus_move(&p, nubus_expand32(nd->data), nd->mask);
+	/* And return the value */
+	return p;
+}
+
+/* These two are for pulling resource data blocks (i.e. stuff that's
+   pointed to with offsets) out of the card ROM. */
+
+void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent *dirent,
+			unsigned int len)
+{
+	unsigned char *t = dest;
+	unsigned char *p = nubus_dirptr(dirent);
+
+	while (len) {
+		*t++ = nubus_get_rom(&p, 1, dirent->mask);
+		len--;
+	}
+}
+EXPORT_SYMBOL(nubus_get_rsrc_mem);
+
+unsigned int nubus_get_rsrc_str(char *dest, const struct nubus_dirent *dirent,
+				unsigned int len)
+{
+	char *t = dest;
+	unsigned char *p = nubus_dirptr(dirent);
+
+	while (len > 1) {
+		unsigned char c = nubus_get_rom(&p, 1, dirent->mask);
+
+		if (!c)
+			break;
+		*t++ = c;
+		len--;
+	}
+	if (len > 0)
+		*t = '\0';
+	return t - dest;
+}
+EXPORT_SYMBOL(nubus_get_rsrc_str);
+
+void nubus_seq_write_rsrc_mem(struct seq_file *m,
+			      const struct nubus_dirent *dirent,
+			      unsigned int len)
+{
+	unsigned long buf[32];
+	unsigned int buf_size = sizeof(buf);
+	unsigned char *p = nubus_dirptr(dirent);
+
+	/* If possible, write out full buffers */
+	while (len >= buf_size) {
+		unsigned int i;
+
+		for (i = 0; i < ARRAY_SIZE(buf); i++)
+			buf[i] = nubus_get_rom(&p, sizeof(buf[0]),
+					       dirent->mask);
+		seq_write(m, buf, buf_size);
+		len -= buf_size;
+	}
+	/* If not, write out individual bytes */
+	while (len--)
+		seq_putc(m, nubus_get_rom(&p, 1, dirent->mask));
+}
+
+int nubus_get_root_dir(const struct nubus_board *board,
+		       struct nubus_dir *dir)
+{
+	dir->ptr = dir->base = board->directory;
+	dir->done = 0;
+	dir->mask = board->lanes;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_get_root_dir);
+
+/* This is a slyly renamed version of the above */
+int nubus_get_func_dir(const struct nubus_rsrc *fres, struct nubus_dir *dir)
+{
+	dir->ptr = dir->base = fres->directory;
+	dir->done = 0;
+	dir->mask = fres->board->lanes;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_get_func_dir);
+
+int nubus_get_board_dir(const struct nubus_board *board,
+			struct nubus_dir *dir)
+{
+	struct nubus_dirent ent;
+
+	dir->ptr = dir->base = board->directory;
+	dir->done = 0;
+	dir->mask = board->lanes;
+
+	/* Now dereference it (the first directory is always the board
+	   directory) */
+	if (nubus_readdir(dir, &ent) == -1)
+		return -1;
+	if (nubus_get_subdir(&ent, dir) == -1)
+		return -1;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_get_board_dir);
+
+int nubus_get_subdir(const struct nubus_dirent *ent,
+		     struct nubus_dir *dir)
+{
+	dir->ptr = dir->base = nubus_dirptr(ent);
+	dir->done = 0;
+	dir->mask = ent->mask;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_get_subdir);
+
+int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent)
+{
+	u32 resid;
+
+	if (nd->done)
+		return -1;
+
+	/* Do this first, otherwise nubus_rewind & co are off by 4 */
+	ent->base = nd->ptr;
+
+	/* This moves nd->ptr forward */
+	resid = nubus_get_rom(&nd->ptr, 4, nd->mask);
+
+	/* EOL marker, as per the Apple docs */
+	if ((resid & 0xff000000) == 0xff000000) {
+		/* Mark it as done */
+		nd->done = 1;
+		return -1;
+	}
+
+	/* First byte is the resource ID */
+	ent->type = resid >> 24;
+	/* Low 3 bytes might contain data (or might not) */
+	ent->data = resid & 0xffffff;
+	ent->mask = nd->mask;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_readdir);
+
+int nubus_rewinddir(struct nubus_dir *dir)
+{
+	dir->ptr = dir->base;
+	dir->done = 0;
+	return 0;
+}
+EXPORT_SYMBOL(nubus_rewinddir);
+
+/* Driver interface functions, more or less like in pci.c */
+
+struct nubus_rsrc *nubus_first_rsrc_or_null(void)
+{
+	return list_first_entry_or_null(&nubus_func_rsrcs, struct nubus_rsrc,
+					list);
+}
+EXPORT_SYMBOL(nubus_first_rsrc_or_null);
+
+struct nubus_rsrc *nubus_next_rsrc_or_null(struct nubus_rsrc *from)
+{
+	if (list_is_last(&from->list, &nubus_func_rsrcs))
+		return NULL;
+	return list_next_entry(from, list);
+}
+EXPORT_SYMBOL(nubus_next_rsrc_or_null);
+
+int
+nubus_find_rsrc(struct nubus_dir *dir, unsigned char rsrc_type,
+		struct nubus_dirent *ent)
+{
+	while (nubus_readdir(dir, ent) != -1) {
+		if (ent->type == rsrc_type)
+			return 0;
+	}
+	return -1;
+}
+EXPORT_SYMBOL(nubus_find_rsrc);
+
+/* Initialization functions - decide which slots contain stuff worth
+   looking at, and print out lots and lots of information from the
+   resource blocks. */
+
+static int __init nubus_get_block_rsrc_dir(struct nubus_board *board,
+					   struct proc_dir_entry *procdir,
+					   const struct nubus_dirent *parent)
+{
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+
+	nubus_get_subdir(parent, &dir);
+	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		u32 size;
+
+		nubus_get_rsrc_mem(&size, &ent, 4);
+		pr_debug("        block (0x%x), size %d\n", ent.type, size);
+		nubus_proc_add_rsrc_mem(dir.procdir, &ent, size);
+	}
+	return 0;
+}
+
+static int __init nubus_get_display_vidmode(struct nubus_board *board,
+					    struct proc_dir_entry *procdir,
+					    const struct nubus_dirent *parent)
+{
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+
+	nubus_get_subdir(parent, &dir);
+	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		switch (ent.type) {
+		case 1: /* mVidParams */
+		case 2: /* mTable */
+		{
+			u32 size;
+
+			nubus_get_rsrc_mem(&size, &ent, 4);
+			pr_debug("        block (0x%x), size %d\n", ent.type,
+				size);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, size);
+			break;
+		}
+		default:
+			pr_debug("        unknown resource 0x%02x, data 0x%06x\n",
+				ent.type, ent.data);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 0);
+		}
+	}
+	return 0;
+}
+
+static int __init nubus_get_display_resource(struct nubus_rsrc *fres,
+					     struct proc_dir_entry *procdir,
+					     const struct nubus_dirent *ent)
+{
+	switch (ent->type) {
+	case NUBUS_RESID_GAMMADIR:
+		pr_debug("    gamma directory offset: 0x%06x\n", ent->data);
+		nubus_get_block_rsrc_dir(fres->board, procdir, ent);
+		break;
+	case 0x0080 ... 0x0085:
+		pr_debug("    mode 0x%02x info offset: 0x%06x\n",
+			ent->type, ent->data);
+		nubus_get_display_vidmode(fres->board, procdir, ent);
+		break;
+	default:
+		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
+			ent->type, ent->data);
+		nubus_proc_add_rsrc_mem(procdir, ent, 0);
+	}
+	return 0;
+}
+
+static int __init nubus_get_network_resource(struct nubus_rsrc *fres,
+					     struct proc_dir_entry *procdir,
+					     const struct nubus_dirent *ent)
+{
+	switch (ent->type) {
+	case NUBUS_RESID_MAC_ADDRESS:
+	{
+		char addr[6];
+
+		nubus_get_rsrc_mem(addr, ent, 6);
+		pr_debug("    MAC address: %pM\n", addr);
+		nubus_proc_add_rsrc_mem(procdir, ent, 6);
+		break;
+	}
+	default:
+		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
+			ent->type, ent->data);
+		nubus_proc_add_rsrc_mem(procdir, ent, 0);
+	}
+	return 0;
+}
+
+static int __init nubus_get_cpu_resource(struct nubus_rsrc *fres,
+					 struct proc_dir_entry *procdir,
+					 const struct nubus_dirent *ent)
+{
+	switch (ent->type) {
+	case NUBUS_RESID_MEMINFO:
+	{
+		unsigned long meminfo[2];
+
+		nubus_get_rsrc_mem(&meminfo, ent, 8);
+		pr_debug("    memory: [ 0x%08lx 0x%08lx ]\n",
+			meminfo[0], meminfo[1]);
+		nubus_proc_add_rsrc_mem(procdir, ent, 8);
+		break;
+	}
+	case NUBUS_RESID_ROMINFO:
+	{
+		unsigned long rominfo[2];
+
+		nubus_get_rsrc_mem(&rominfo, ent, 8);
+		pr_debug("    ROM:    [ 0x%08lx 0x%08lx ]\n",
+			rominfo[0], rominfo[1]);
+		nubus_proc_add_rsrc_mem(procdir, ent, 8);
+		break;
+	}
+	default:
+		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
+			ent->type, ent->data);
+		nubus_proc_add_rsrc_mem(procdir, ent, 0);
+	}
+	return 0;
+}
+
+static int __init nubus_get_private_resource(struct nubus_rsrc *fres,
+					     struct proc_dir_entry *procdir,
+					     const struct nubus_dirent *ent)
+{
+	switch (fres->category) {
+	case NUBUS_CAT_DISPLAY:
+		nubus_get_display_resource(fres, procdir, ent);
+		break;
+	case NUBUS_CAT_NETWORK:
+		nubus_get_network_resource(fres, procdir, ent);
+		break;
+	case NUBUS_CAT_CPU:
+		nubus_get_cpu_resource(fres, procdir, ent);
+		break;
+	default:
+		pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
+			ent->type, ent->data);
+		nubus_proc_add_rsrc_mem(procdir, ent, 0);
+	}
+	return 0;
+}
+
+static struct nubus_rsrc * __init
+nubus_get_functional_resource(struct nubus_board *board, int slot,
+			      const struct nubus_dirent *parent)
+{
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+	struct nubus_rsrc *fres;
+
+	pr_debug("  Functional resource 0x%02x:\n", parent->type);
+	nubus_get_subdir(parent, &dir);
+	dir.procdir = nubus_proc_add_rsrc_dir(board->procdir, parent, board);
+
+	/* Actually we should probably panic if this fails */
+	fres = kzalloc(sizeof(*fres), GFP_ATOMIC);
+	if (!fres)
+		return NULL;
+	fres->resid = parent->type;
+	fres->directory = dir.base;
+	fres->board = board;
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		switch (ent.type) {
+		case NUBUS_RESID_TYPE:
+		{
+			unsigned short nbtdata[4];
+
+			nubus_get_rsrc_mem(nbtdata, &ent, 8);
+			fres->category = nbtdata[0];
+			fres->type     = nbtdata[1];
+			fres->dr_sw    = nbtdata[2];
+			fres->dr_hw    = nbtdata[3];
+			pr_debug("    type: [cat 0x%x type 0x%x sw 0x%x hw 0x%x]\n",
+				nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 8);
+			break;
+		}
+		case NUBUS_RESID_NAME:
+		{
+			char name[64];
+			unsigned int len;
+
+			len = nubus_get_rsrc_str(name, &ent, sizeof(name));
+			pr_debug("    name: %s\n", name);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
+			break;
+		}
+		case NUBUS_RESID_DRVRDIR:
+		{
+			/* MacOS driver.  If we were NetBSD we might
+			   use this :-) */
+			pr_debug("    driver directory offset: 0x%06x\n",
+				ent.data);
+			nubus_get_block_rsrc_dir(board, dir.procdir, &ent);
+			break;
+		}
+		case NUBUS_RESID_MINOR_BASEOS:
+		{
+			/* We will need this in order to support
+			   multiple framebuffers.  It might be handy
+			   for Ethernet as well */
+			u32 base_offset;
+
+			nubus_get_rsrc_mem(&base_offset, &ent, 4);
+			pr_debug("    memory offset: 0x%08x\n", base_offset);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 4);
+			break;
+		}
+		case NUBUS_RESID_MINOR_LENGTH:
+		{
+			/* Ditto */
+			u32 length;
+
+			nubus_get_rsrc_mem(&length, &ent, 4);
+			pr_debug("    memory length: 0x%08x\n", length);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 4);
+			break;
+		}
+		case NUBUS_RESID_FLAGS:
+			pr_debug("    flags: 0x%06x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_HWDEVID:
+			pr_debug("    hwdevid: 0x%06x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		default:
+			/* Local/Private resources have their own
+			   function */
+			nubus_get_private_resource(fres, dir.procdir, &ent);
+		}
+	}
+
+	return fres;
+}
+
+/* This is *really* cool. */
+static int __init nubus_get_icon(struct nubus_board *board,
+				 struct proc_dir_entry *procdir,
+				 const struct nubus_dirent *ent)
+{
+	/* Should be 32x32 if my memory serves me correctly */
+	u32 icon[32];
+	int i;
+
+	nubus_get_rsrc_mem(&icon, ent, 128);
+	pr_debug("    icon:\n");
+	for (i = 0; i < 8; i++)
+		pr_debug("        %08x %08x %08x %08x\n",
+			icon[i * 4 + 0], icon[i * 4 + 1],
+			icon[i * 4 + 2], icon[i * 4 + 3]);
+	nubus_proc_add_rsrc_mem(procdir, ent, 128);
+
+	return 0;
+}
+
+static int __init nubus_get_vendorinfo(struct nubus_board *board,
+				       struct proc_dir_entry *procdir,
+				       const struct nubus_dirent *parent)
+{
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+	static char *vendor_fields[6] = { "ID", "serial", "revision",
+	                                  "part", "date", "unknown field" };
+
+	pr_debug("    vendor info:\n");
+	nubus_get_subdir(parent, &dir);
+	dir.procdir = nubus_proc_add_rsrc_dir(procdir, parent, board);
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		char name[64];
+		unsigned int len;
+
+		/* These are all strings, we think */
+		len = nubus_get_rsrc_str(name, &ent, sizeof(name));
+		if (ent.type < 1 || ent.type > 5)
+			ent.type = 5;
+		pr_debug("    %s: %s\n", vendor_fields[ent.type - 1], name);
+		nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
+	}
+	return 0;
+}
+
+static int __init nubus_get_board_resource(struct nubus_board *board, int slot,
+					   const struct nubus_dirent *parent)
+{
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+
+	pr_debug("  Board resource 0x%02x:\n", parent->type);
+	nubus_get_subdir(parent, &dir);
+	dir.procdir = nubus_proc_add_rsrc_dir(board->procdir, parent, board);
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		switch (ent.type) {
+		case NUBUS_RESID_TYPE:
+		{
+			unsigned short nbtdata[4];
+			/* This type is always the same, and is not
+			   useful except insofar as it tells us that
+			   we really are looking at a board resource. */
+			nubus_get_rsrc_mem(nbtdata, &ent, 8);
+			pr_debug("    type: [cat 0x%x type 0x%x sw 0x%x hw 0x%x]\n",
+				nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
+			if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
+			    nbtdata[2] != 0 || nbtdata[3] != 0)
+				pr_err("Slot %X: sResource is not a board resource!\n",
+				       slot);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 8);
+			break;
+		}
+		case NUBUS_RESID_NAME:
+		{
+			unsigned int len;
+
+			len = nubus_get_rsrc_str(board->name, &ent,
+						 sizeof(board->name));
+			pr_debug("    name: %s\n", board->name);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, len + 1);
+			break;
+		}
+		case NUBUS_RESID_ICON:
+			nubus_get_icon(board, dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_BOARDID:
+			pr_debug("    board id: 0x%x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_PRIMARYINIT:
+			pr_debug("    primary init offset: 0x%06x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_VENDORINFO:
+			nubus_get_vendorinfo(board, dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_FLAGS:
+			pr_debug("    flags: 0x%06x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_HWDEVID:
+			pr_debug("    hwdevid: 0x%06x\n", ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		case NUBUS_RESID_SECONDINIT:
+			pr_debug("    secondary init offset: 0x%06x\n",
+				 ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+			/* WTF isn't this in the functional resources? */
+		case NUBUS_RESID_VIDNAMES:
+			pr_debug("    vidnames directory offset: 0x%06x\n",
+				ent.data);
+			nubus_get_block_rsrc_dir(board, dir.procdir, &ent);
+			break;
+			/* Same goes for this */
+		case NUBUS_RESID_VIDMODES:
+			pr_debug("    video mode parameter directory offset: 0x%06x\n",
+				ent.data);
+			nubus_proc_add_rsrc(dir.procdir, &ent);
+			break;
+		default:
+			pr_debug("    unknown resource 0x%02x, data 0x%06x\n",
+				ent.type, ent.data);
+			nubus_proc_add_rsrc_mem(dir.procdir, &ent, 0);
+		}
+	}
+	return 0;
+}
+
+static void __init nubus_add_board(int slot, int bytelanes)
+{
+	struct nubus_board *board;
+	unsigned char *rp;
+	unsigned long dpat;
+	struct nubus_dir dir;
+	struct nubus_dirent ent;
+	int prev_resid = -1;
+
+	/* Move to the start of the format block */
+	rp = nubus_rom_addr(slot);
+	nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes);
+
+	/* Actually we should probably panic if this fails */
+	if ((board = kzalloc(sizeof(*board), GFP_ATOMIC)) == NULL)
+		return;
+	board->fblock = rp;
+
+	/* Dump the format block for debugging purposes */
+	pr_debug("Slot %X, format block at 0x%p:\n", slot, rp);
+	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
+	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
+	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
+	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
+	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
+	pr_debug("%08lx\n", nubus_get_rom(&rp, 4, bytelanes));
+	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
+	pr_debug("%02lx\n", nubus_get_rom(&rp, 1, bytelanes));
+	rp = board->fblock;
+
+	board->slot = slot;
+	board->slot_addr = (unsigned long)nubus_slot_addr(slot);
+	board->doffset = nubus_get_rom(&rp, 4, bytelanes);
+	/* rom_length is *supposed* to be the total length of the
+	 * ROM.  In practice it is the "amount of ROM used to compute
+	 * the CRC."  So some jokers decide to set it to zero and
+	 * set the crc to zero so they don't have to do any math.
+	 * See the Performa 460 ROM, for example.  Those Apple "engineers".
+	 */
+	board->rom_length = nubus_get_rom(&rp, 4, bytelanes);
+	board->crc = nubus_get_rom(&rp, 4, bytelanes);
+	board->rev = nubus_get_rom(&rp, 1, bytelanes);
+	board->format = nubus_get_rom(&rp, 1, bytelanes);
+	board->lanes = bytelanes;
+
+	/* Directory offset should be small and negative... */
+	if (!(board->doffset & 0x00FF0000))
+		pr_warn("Slot %X: Dodgy doffset!\n", slot);
+	dpat = nubus_get_rom(&rp, 4, bytelanes);
+	if (dpat != NUBUS_TEST_PATTERN)
+		pr_warn("Slot %X: Wrong test pattern %08lx!\n", slot, dpat);
+
+	/*
+	 *	I wonder how the CRC is meant to work -
+	 *		any takers ?
+	 * CSA: According to MAC docs, not all cards pass the CRC anyway,
+	 * since the initial Macintosh ROM releases skipped the check.
+	 */
+
+	/* Set up the directory pointer */
+	board->directory = board->fblock;
+	nubus_move(&board->directory, nubus_expand32(board->doffset),
+	           board->lanes);
+
+	nubus_get_root_dir(board, &dir);
+
+	/* We're ready to rock */
+	pr_debug("Slot %X resources:\n", slot);
+
+	/* Each slot should have one board resource and any number of
+	 * functional resources.  So we'll fill in some fields in the
+	 * struct nubus_board from the board resource, then walk down
+	 * the list of functional resources, spinning out a nubus_rsrc
+	 * for each of them.
+	 */
+	if (nubus_readdir(&dir, &ent) == -1) {
+		/* We can't have this! */
+		pr_err("Slot %X: Board resource not found!\n", slot);
+		kfree(board);
+		return;
+	}
+
+	if (ent.type < 1 || ent.type > 127)
+		pr_warn("Slot %X: Board resource ID is invalid!\n", slot);
+
+	board->procdir = nubus_proc_add_board(board);
+
+	nubus_get_board_resource(board, slot, &ent);
+
+	while (nubus_readdir(&dir, &ent) != -1) {
+		struct nubus_rsrc *fres;
+
+		fres = nubus_get_functional_resource(board, slot, &ent);
+		if (fres == NULL)
+			continue;
+
+		/* Resources should appear in ascending ID order. This sanity
+		 * check prevents duplicate resource IDs.
+		 */
+		if (fres->resid <= prev_resid) {
+			kfree(fres);
+			continue;
+		}
+		prev_resid = fres->resid;
+
+		list_add_tail(&fres->list, &nubus_func_rsrcs);
+	}
+
+	if (nubus_device_register(board))
+		put_device(&board->dev);
+}
+
+static void __init nubus_probe_slot(int slot)
+{
+	unsigned char dp;
+	unsigned char *rp;
+	int i;
+
+	rp = nubus_rom_addr(slot);
+	for (i = 4; i; i--) {
+		rp--;
+		if (!hwreg_present(rp))
+			continue;
+
+		dp = *rp;
+
+		/* The last byte of the format block consists of two
+		   nybbles which are "mirror images" of each other.
+		   These show us the valid bytelanes */
+		if ((((dp >> 4) ^ dp) & 0x0F) != 0x0F)
+			continue;
+		/* Check that this value is actually *on* one of the
+		   bytelanes it claims are valid! */
+		if (not_useful(rp, dp))
+			continue;
+
+		/* Looks promising.  Let's put it on the list. */
+		nubus_add_board(slot, dp);
+
+		return;
+	}
+}
+
+static void __init nubus_scan_bus(void)
+{
+	int slot;
+
+	pr_info("NuBus: Scanning NuBus slots.\n");
+	for (slot = 9; slot < 15; slot++) {
+		nubus_probe_slot(slot);
+	}
+}
+
+static int __init nubus_init(void)
+{
+	int err;
+
+	if (!MACH_IS_MAC)
+		return 0;
+
+	nubus_proc_init();
+	err = nubus_parent_device_register();
+	if (err)
+		return err;
+	nubus_scan_bus();
+	return 0;
+}
+
+subsys_initcall(nubus_init);
diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c
new file mode 100644
index 000000000..cd4bd06cf
--- /dev/null
+++ b/drivers/nubus/proc.c
@@ -0,0 +1,198 @@
+// 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)
+		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)
+		return NULL;
+	snprintf(name, sizeof(name), "%x", ent->type);
+	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)
+		return;
+
+	snprintf(name, sizeof(name), "%x", ent->type);
+	if (size)
+		pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
+	else
+		pded = NULL;
+	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)
+		return;
+
+	snprintf(name, sizeof(name), "%x", ent->type);
+	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);
+}