Adding upstream version 5.10.209.upstream/5.10.209

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

5 files changed, 1243 insertions, 0 deletions

diff --git a/drivers/pnp/isapnp/Kconfig b/drivers/pnp/isapnp/Kconfig
new file mode 100644
index 000000000..d0479a563
--- /dev/null
+++ b/drivers/pnp/isapnp/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# ISA Plug and Play configuration
+#
+config ISAPNP
+	bool "ISA Plug and Play support"
+	depends on ISA || COMPILE_TEST
+	help
+	  Say Y here if you would like support for ISA Plug and Play devices.
+	  Some information is in <file:Documentation/driver-api/isapnp.rst>.
+
+	  If unsure, say Y.
diff --git a/drivers/pnp/isapnp/Makefile b/drivers/pnp/isapnp/Makefile
new file mode 100644
index 000000000..a0e0c0aec
--- /dev/null
+++ b/drivers/pnp/isapnp/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the kernel ISAPNP driver.
+#
+obj-y			+= pnp.o
+pnp-y			:= core.o compat.o
+
+pnp-$(CONFIG_PROC_FS)	+= proc.o
diff --git a/drivers/pnp/isapnp/compat.c b/drivers/pnp/isapnp/compat.c
new file mode 100644
index 000000000..035e95092
--- /dev/null
+++ b/drivers/pnp/isapnp/compat.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * compat.c - A series of functions to make it easier to convert drivers that use
+ *            the old isapnp APIs. If possible use the new APIs instead.
+ *
+ * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
+ */
+
+#include <linux/module.h>
+#include <linux/isapnp.h>
+#include <linux/string.h>
+
+static void pnp_convert_id(char *buf, unsigned short vendor,
+			   unsigned short device)
+{
+	sprintf(buf, "%c%c%c%x%x%x%x",
+		'A' + ((vendor >> 2) & 0x3f) - 1,
+		'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
+		'A' + ((vendor >> 8) & 0x1f) - 1,
+		(device >> 4) & 0x0f, device & 0x0f,
+		(device >> 12) & 0x0f, (device >> 8) & 0x0f);
+}
+
+struct pnp_dev *pnp_find_dev(struct pnp_card *card, unsigned short vendor,
+			     unsigned short function, struct pnp_dev *from)
+{
+	char id[8];
+	char any[8];
+
+	pnp_convert_id(id, vendor, function);
+	pnp_convert_id(any, ISAPNP_ANY_ID, ISAPNP_ANY_ID);
+	if (card == NULL) {	/* look for a logical device from all cards */
+		struct list_head *list;
+
+		list = pnp_global.next;
+		if (from)
+			list = from->global_list.next;
+
+		while (list != &pnp_global) {
+			struct pnp_dev *dev = global_to_pnp_dev(list);
+
+			if (compare_pnp_id(dev->id, id) ||
+			    (memcmp(id, any, 7) == 0))
+				return dev;
+			list = list->next;
+		}
+	} else {
+		struct list_head *list;
+
+		list = card->devices.next;
+		if (from) {
+			list = from->card_list.next;
+			if (from->card != card)	/* something is wrong */
+				return NULL;
+		}
+		while (list != &card->devices) {
+			struct pnp_dev *dev = card_to_pnp_dev(list);
+
+			if (compare_pnp_id(dev->id, id))
+				return dev;
+			list = list->next;
+		}
+	}
+	return NULL;
+}
+
+EXPORT_SYMBOL(pnp_find_dev);
diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
new file mode 100644
index 000000000..c43d8ad02
--- /dev/null
+++ b/drivers/pnp/isapnp/core.c
@@ -0,0 +1,1069 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  ISA Plug & Play support
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ *  Changelog:
+ *  2000-01-01	Added quirks handling for buggy hardware
+ *		Peter Denison <peterd@pnd-pc.demon.co.uk>
+ *  2000-06-14	Added isapnp_probe_devs() and isapnp_activate_dev()
+ *		Christoph Hellwig <hch@infradead.org>
+ *  2001-06-03  Added release_region calls to correspond with
+ *		request_region calls when a failure occurs.  Also
+ *		added KERN_* constants to printk() calls.
+ *  2001-11-07  Added isapnp_{,un}register_driver calls along the lines
+ *              of the pci driver interface
+ *              Kai Germaschewski <kai.germaschewski@gmx.de>
+ *  2002-06-06  Made the use of dma channel 0 configurable
+ *              Gerald Teschl <gerald.teschl@univie.ac.at>
+ *  2002-10-06  Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com>
+ *  2003-08-11	Resource Management Updates - Adam Belay <ambx1@neo.rr.com>
+ */
+
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/isapnp.h>
+#include <linux/mutex.h>
+#include <asm/io.h>
+
+#include "../base.h"
+
+#if 0
+#define ISAPNP_REGION_OK
+#endif
+
+int isapnp_disable;		/* Disable ISA PnP */
+static int isapnp_rdp;		/* Read Data Port */
+static int isapnp_reset = 1;	/* reset all PnP cards (deactivate) */
+static int isapnp_verbose = 1;	/* verbose mode */
+
+module_param(isapnp_disable, int, 0);
+MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
+module_param(isapnp_rdp, int, 0);
+MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
+module_param(isapnp_reset, int, 0);
+MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
+module_param(isapnp_verbose, int, 0);
+MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
+
+#define _PIDXR		0x279
+#define _PNPWRP		0xa79
+
+/* short tags */
+#define _STAG_PNPVERNO		0x01
+#define _STAG_LOGDEVID		0x02
+#define _STAG_COMPATDEVID	0x03
+#define _STAG_IRQ		0x04
+#define _STAG_DMA		0x05
+#define _STAG_STARTDEP		0x06
+#define _STAG_ENDDEP		0x07
+#define _STAG_IOPORT		0x08
+#define _STAG_FIXEDIO		0x09
+#define _STAG_VENDOR		0x0e
+#define _STAG_END		0x0f
+/* long tags */
+#define _LTAG_MEMRANGE		0x81
+#define _LTAG_ANSISTR		0x82
+#define _LTAG_UNICODESTR	0x83
+#define _LTAG_VENDOR		0x84
+#define _LTAG_MEM32RANGE	0x85
+#define _LTAG_FIXEDMEM32RANGE	0x86
+
+/* Logical device control and configuration registers */
+
+#define ISAPNP_CFG_ACTIVATE	0x30	/* byte */
+#define ISAPNP_CFG_MEM		0x40	/* 4 * dword */
+#define ISAPNP_CFG_PORT		0x60	/* 8 * word */
+#define ISAPNP_CFG_IRQ		0x70	/* 2 * word */
+#define ISAPNP_CFG_DMA		0x74	/* 2 * byte */
+
+/*
+ * Sizes of ISAPNP logical device configuration register sets.
+ * See PNP-ISA-v1.0a.pdf, Appendix A.
+ */
+#define ISAPNP_MAX_MEM		4
+#define ISAPNP_MAX_PORT		8
+#define ISAPNP_MAX_IRQ		2
+#define ISAPNP_MAX_DMA		2
+
+static unsigned char isapnp_checksum_value;
+static DEFINE_MUTEX(isapnp_cfg_mutex);
+static int isapnp_csn_count;
+
+/* some prototypes */
+
+static inline void write_data(unsigned char x)
+{
+	outb(x, _PNPWRP);
+}
+
+static inline void write_address(unsigned char x)
+{
+	outb(x, _PIDXR);
+	udelay(20);
+}
+
+static inline unsigned char read_data(void)
+{
+	unsigned char val = inb(isapnp_rdp);
+	return val;
+}
+
+unsigned char isapnp_read_byte(unsigned char idx)
+{
+	write_address(idx);
+	return read_data();
+}
+
+static unsigned short isapnp_read_word(unsigned char idx)
+{
+	unsigned short val;
+
+	val = isapnp_read_byte(idx);
+	val = (val << 8) + isapnp_read_byte(idx + 1);
+	return val;
+}
+
+void isapnp_write_byte(unsigned char idx, unsigned char val)
+{
+	write_address(idx);
+	write_data(val);
+}
+
+static void isapnp_write_word(unsigned char idx, unsigned short val)
+{
+	isapnp_write_byte(idx, val >> 8);
+	isapnp_write_byte(idx + 1, val);
+}
+
+static void isapnp_key(void)
+{
+	unsigned char code = 0x6a, msb;
+	int i;
+
+	mdelay(1);
+	write_address(0x00);
+	write_address(0x00);
+
+	write_address(code);
+
+	for (i = 1; i < 32; i++) {
+		msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
+		code = (code >> 1) | msb;
+		write_address(code);
+	}
+}
+
+/* place all pnp cards in wait-for-key state */
+static void isapnp_wait(void)
+{
+	isapnp_write_byte(0x02, 0x02);
+}
+
+static void isapnp_wake(unsigned char csn)
+{
+	isapnp_write_byte(0x03, csn);
+}
+
+static void isapnp_device(unsigned char logdev)
+{
+	isapnp_write_byte(0x07, logdev);
+}
+
+static void isapnp_activate(unsigned char logdev)
+{
+	isapnp_device(logdev);
+	isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
+	udelay(250);
+}
+
+static void isapnp_deactivate(unsigned char logdev)
+{
+	isapnp_device(logdev);
+	isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
+	udelay(500);
+}
+
+static void __init isapnp_peek(unsigned char *data, int bytes)
+{
+	int i, j;
+	unsigned char d = 0;
+
+	for (i = 1; i <= bytes; i++) {
+		for (j = 0; j < 20; j++) {
+			d = isapnp_read_byte(0x05);
+			if (d & 1)
+				break;
+			udelay(100);
+		}
+		if (!(d & 1)) {
+			if (data != NULL)
+				*data++ = 0xff;
+			continue;
+		}
+		d = isapnp_read_byte(0x04);	/* PRESDI */
+		isapnp_checksum_value += d;
+		if (data != NULL)
+			*data++ = d;
+	}
+}
+
+#define RDP_STEP	32	/* minimum is 4 */
+
+static int isapnp_next_rdp(void)
+{
+	int rdp = isapnp_rdp;
+	static int old_rdp = 0;
+
+	if (old_rdp) {
+		release_region(old_rdp, 1);
+		old_rdp = 0;
+	}
+	while (rdp <= 0x3ff) {
+		/*
+		 *      We cannot use NE2000 probe spaces for ISAPnP or we
+		 *      will lock up machines.
+		 */
+		if ((rdp < 0x280 || rdp > 0x380)
+		    && request_region(rdp, 1, "ISAPnP")) {
+			isapnp_rdp = rdp;
+			old_rdp = rdp;
+			return 0;
+		}
+		rdp += RDP_STEP;
+	}
+	return -1;
+}
+
+/* Set read port address */
+static inline void isapnp_set_rdp(void)
+{
+	isapnp_write_byte(0x00, isapnp_rdp >> 2);
+	udelay(100);
+}
+
+/*
+ *	Perform an isolation. The port selection code now tries to avoid
+ *	"dangerous to read" ports.
+ */
+static int __init isapnp_isolate_rdp_select(void)
+{
+	isapnp_wait();
+	isapnp_key();
+
+	/* Control: reset CSN and conditionally everything else too */
+	isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
+	mdelay(2);
+
+	isapnp_wait();
+	isapnp_key();
+	isapnp_wake(0x00);
+
+	if (isapnp_next_rdp() < 0) {
+		isapnp_wait();
+		return -1;
+	}
+
+	isapnp_set_rdp();
+	udelay(1000);
+	write_address(0x01);
+	udelay(1000);
+	return 0;
+}
+
+/*
+ *  Isolate (assign uniqued CSN) to all ISA PnP devices.
+ */
+static int __init isapnp_isolate(void)
+{
+	unsigned char checksum = 0x6a;
+	unsigned char chksum = 0x00;
+	unsigned char bit = 0x00;
+	int data;
+	int csn = 0;
+	int i;
+	int iteration = 1;
+
+	isapnp_rdp = 0x213;
+	if (isapnp_isolate_rdp_select() < 0)
+		return -1;
+
+	while (1) {
+		for (i = 1; i <= 64; i++) {
+			data = read_data() << 8;
+			udelay(250);
+			data = data | read_data();
+			udelay(250);
+			if (data == 0x55aa)
+				bit = 0x01;
+			checksum =
+			    ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
+			    | (checksum >> 1);
+			bit = 0x00;
+		}
+		for (i = 65; i <= 72; i++) {
+			data = read_data() << 8;
+			udelay(250);
+			data = data | read_data();
+			udelay(250);
+			if (data == 0x55aa)
+				chksum |= (1 << (i - 65));
+		}
+		if (checksum != 0x00 && checksum == chksum) {
+			csn++;
+
+			isapnp_write_byte(0x06, csn);
+			udelay(250);
+			iteration++;
+			isapnp_wake(0x00);
+			isapnp_set_rdp();
+			udelay(1000);
+			write_address(0x01);
+			udelay(1000);
+			goto __next;
+		}
+		if (iteration == 1) {
+			isapnp_rdp += RDP_STEP;
+			if (isapnp_isolate_rdp_select() < 0)
+				return -1;
+		} else if (iteration > 1) {
+			break;
+		}
+__next:
+		if (csn == 255)
+			break;
+		checksum = 0x6a;
+		chksum = 0x00;
+		bit = 0x00;
+	}
+	isapnp_wait();
+	isapnp_csn_count = csn;
+	return csn;
+}
+
+/*
+ *  Read one tag from stream.
+ */
+static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
+{
+	unsigned char tag, tmp[2];
+
+	isapnp_peek(&tag, 1);
+	if (tag == 0)		/* invalid tag */
+		return -1;
+	if (tag & 0x80) {	/* large item */
+		*type = tag;
+		isapnp_peek(tmp, 2);
+		*size = (tmp[1] << 8) | tmp[0];
+	} else {
+		*type = (tag >> 3) & 0x0f;
+		*size = tag & 0x07;
+	}
+	if (*type == 0xff && *size == 0xffff)	/* probably invalid data */
+		return -1;
+	return 0;
+}
+
+/*
+ *  Skip specified number of bytes from stream.
+ */
+static void __init isapnp_skip_bytes(int count)
+{
+	isapnp_peek(NULL, count);
+}
+
+/*
+ *  Parse logical device tag.
+ */
+static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
+						  int size, int number)
+{
+	unsigned char tmp[6];
+	struct pnp_dev *dev;
+	u32 eisa_id;
+	char id[8];
+
+	isapnp_peek(tmp, size);
+	eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24;
+	pnp_eisa_id_to_string(eisa_id, id);
+
+	dev = pnp_alloc_dev(&isapnp_protocol, number, id);
+	if (!dev)
+		return NULL;
+
+	dev->card = card;
+	dev->capabilities |= PNP_CONFIGURABLE;
+	dev->capabilities |= PNP_READ;
+	dev->capabilities |= PNP_WRITE;
+	dev->capabilities |= PNP_DISABLE;
+	pnp_init_resources(dev);
+	return dev;
+}
+
+/*
+ *  Add IRQ resource to resources list.
+ */
+static void __init isapnp_parse_irq_resource(struct pnp_dev *dev,
+					     unsigned int option_flags,
+					     int size)
+{
+	unsigned char tmp[3];
+	unsigned long bits;
+	pnp_irq_mask_t map;
+	unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
+
+	isapnp_peek(tmp, size);
+	bits = (tmp[1] << 8) | tmp[0];
+
+	bitmap_zero(map.bits, PNP_IRQ_NR);
+	bitmap_copy(map.bits, &bits, 16);
+
+	if (size > 2)
+		flags = tmp[2];
+
+	pnp_register_irq_resource(dev, option_flags, &map, flags);
+}
+
+/*
+ *  Add DMA resource to resources list.
+ */
+static void __init isapnp_parse_dma_resource(struct pnp_dev *dev,
+					     unsigned int option_flags,
+					     int size)
+{
+	unsigned char tmp[2];
+
+	isapnp_peek(tmp, size);
+	pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]);
+}
+
+/*
+ *  Add port resource to resources list.
+ */
+static void __init isapnp_parse_port_resource(struct pnp_dev *dev,
+					      unsigned int option_flags,
+					      int size)
+{
+	unsigned char tmp[7];
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	isapnp_peek(tmp, size);
+	min = (tmp[2] << 8) | tmp[1];
+	max = (tmp[4] << 8) | tmp[3];
+	align = tmp[5];
+	len = tmp[6];
+	flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0;
+	pnp_register_port_resource(dev, option_flags,
+				   min, max, align, len, flags);
+}
+
+/*
+ *  Add fixed port resource to resources list.
+ */
+static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev,
+						    unsigned int option_flags,
+						    int size)
+{
+	unsigned char tmp[3];
+	resource_size_t base, len;
+
+	isapnp_peek(tmp, size);
+	base = (tmp[1] << 8) | tmp[0];
+	len = tmp[2];
+	pnp_register_port_resource(dev, option_flags, base, base, 0, len,
+				   IORESOURCE_IO_FIXED);
+}
+
+/*
+ *  Add memory resource to resources list.
+ */
+static void __init isapnp_parse_mem_resource(struct pnp_dev *dev,
+					     unsigned int option_flags,
+					     int size)
+{
+	unsigned char tmp[9];
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	isapnp_peek(tmp, size);
+	min = ((tmp[2] << 8) | tmp[1]) << 8;
+	max = ((tmp[4] << 8) | tmp[3]) << 8;
+	align = (tmp[6] << 8) | tmp[5];
+	len = ((tmp[8] << 8) | tmp[7]) << 8;
+	flags = tmp[0];
+	pnp_register_mem_resource(dev, option_flags,
+				  min, max, align, len, flags);
+}
+
+/*
+ *  Add 32-bit memory resource to resources list.
+ */
+static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev,
+					       unsigned int option_flags,
+					       int size)
+{
+	unsigned char tmp[17];
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	isapnp_peek(tmp, size);
+	min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
+	max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
+	align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
+	len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
+	flags = tmp[0];
+	pnp_register_mem_resource(dev, option_flags,
+				  min, max, align, len, flags);
+}
+
+/*
+ *  Add 32-bit fixed memory resource to resources list.
+ */
+static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev,
+						     unsigned int option_flags,
+						     int size)
+{
+	unsigned char tmp[9];
+	resource_size_t base, len;
+	unsigned char flags;
+
+	isapnp_peek(tmp, size);
+	base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
+	len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
+	flags = tmp[0];
+	pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
+}
+
+/*
+ *  Parse card name for ISA PnP device.
+ */
+static void __init
+isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
+{
+	if (name[0] == '\0') {
+		unsigned short size1 =
+		    *size >= name_max ? (name_max - 1) : *size;
+		isapnp_peek(name, size1);
+		name[size1] = '\0';
+		*size -= size1;
+
+		/* clean whitespace from end of string */
+		while (size1 > 0 && name[--size1] == ' ')
+			name[size1] = '\0';
+	}
+}
+
+/*
+ *  Parse resource map for logical device.
+ */
+static int __init isapnp_create_device(struct pnp_card *card,
+				       unsigned short size)
+{
+	int number = 0, skip = 0, priority, compat = 0;
+	unsigned char type, tmp[17];
+	unsigned int option_flags;
+	struct pnp_dev *dev;
+	u32 eisa_id;
+	char id[8];
+
+	if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
+		return 1;
+	option_flags = 0;
+	pnp_add_card_device(card, dev);
+
+	while (1) {
+		if (isapnp_read_tag(&type, &size) < 0)
+			return 1;
+		if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
+			goto __skip;
+		switch (type) {
+		case _STAG_LOGDEVID:
+			if (size >= 5 && size <= 6) {
+				if ((dev =
+				     isapnp_parse_device(card, size,
+							 number++)) == NULL)
+					return 1;
+				size = 0;
+				skip = 0;
+				option_flags = 0;
+				pnp_add_card_device(card, dev);
+			} else {
+				skip = 1;
+			}
+			compat = 0;
+			break;
+		case _STAG_COMPATDEVID:
+			if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
+				isapnp_peek(tmp, 4);
+				eisa_id = tmp[0] | tmp[1] << 8 |
+					  tmp[2] << 16 | tmp[3] << 24;
+				pnp_eisa_id_to_string(eisa_id, id);
+				pnp_add_id(dev, id);
+				compat++;
+				size = 0;
+			}
+			break;
+		case _STAG_IRQ:
+			if (size < 2 || size > 3)
+				goto __skip;
+			isapnp_parse_irq_resource(dev, option_flags, size);
+			size = 0;
+			break;
+		case _STAG_DMA:
+			if (size != 2)
+				goto __skip;
+			isapnp_parse_dma_resource(dev, option_flags, size);
+			size = 0;
+			break;
+		case _STAG_STARTDEP:
+			if (size > 1)
+				goto __skip;
+			priority = PNP_RES_PRIORITY_ACCEPTABLE;
+			if (size > 0) {
+				isapnp_peek(tmp, size);
+				priority = tmp[0];
+				size = 0;
+			}
+			option_flags = pnp_new_dependent_set(dev, priority);
+			break;
+		case _STAG_ENDDEP:
+			if (size != 0)
+				goto __skip;
+			option_flags = 0;
+			break;
+		case _STAG_IOPORT:
+			if (size != 7)
+				goto __skip;
+			isapnp_parse_port_resource(dev, option_flags, size);
+			size = 0;
+			break;
+		case _STAG_FIXEDIO:
+			if (size != 3)
+				goto __skip;
+			isapnp_parse_fixed_port_resource(dev, option_flags,
+							 size);
+			size = 0;
+			break;
+		case _STAG_VENDOR:
+			break;
+		case _LTAG_MEMRANGE:
+			if (size != 9)
+				goto __skip;
+			isapnp_parse_mem_resource(dev, option_flags, size);
+			size = 0;
+			break;
+		case _LTAG_ANSISTR:
+			isapnp_parse_name(dev->name, sizeof(dev->name), &size);
+			break;
+		case _LTAG_UNICODESTR:
+			/* silently ignore */
+			/* who use unicode for hardware identification? */
+			break;
+		case _LTAG_VENDOR:
+			break;
+		case _LTAG_MEM32RANGE:
+			if (size != 17)
+				goto __skip;
+			isapnp_parse_mem32_resource(dev, option_flags, size);
+			size = 0;
+			break;
+		case _LTAG_FIXEDMEM32RANGE:
+			if (size != 9)
+				goto __skip;
+			isapnp_parse_fixed_mem32_resource(dev, option_flags,
+							  size);
+			size = 0;
+			break;
+		case _STAG_END:
+			if (size > 0)
+				isapnp_skip_bytes(size);
+			return 1;
+		default:
+			dev_err(&dev->dev, "unknown tag %#x (card %i), "
+				"ignored\n", type, card->number);
+		}
+__skip:
+		if (size > 0)
+			isapnp_skip_bytes(size);
+	}
+	return 0;
+}
+
+/*
+ *  Parse resource map for ISA PnP card.
+ */
+static void __init isapnp_parse_resource_map(struct pnp_card *card)
+{
+	unsigned char type, tmp[17];
+	unsigned short size;
+
+	while (1) {
+		if (isapnp_read_tag(&type, &size) < 0)
+			return;
+		switch (type) {
+		case _STAG_PNPVERNO:
+			if (size != 2)
+				goto __skip;
+			isapnp_peek(tmp, 2);
+			card->pnpver = tmp[0];
+			card->productver = tmp[1];
+			size = 0;
+			break;
+		case _STAG_LOGDEVID:
+			if (size >= 5 && size <= 6) {
+				if (isapnp_create_device(card, size) == 1)
+					return;
+				size = 0;
+			}
+			break;
+		case _STAG_VENDOR:
+			break;
+		case _LTAG_ANSISTR:
+			isapnp_parse_name(card->name, sizeof(card->name),
+					  &size);
+			break;
+		case _LTAG_UNICODESTR:
+			/* silently ignore */
+			/* who use unicode for hardware identification? */
+			break;
+		case _LTAG_VENDOR:
+			break;
+		case _STAG_END:
+			if (size > 0)
+				isapnp_skip_bytes(size);
+			return;
+		default:
+			dev_err(&card->dev, "unknown tag %#x, ignored\n",
+			       type);
+		}
+__skip:
+		if (size > 0)
+			isapnp_skip_bytes(size);
+	}
+}
+
+/*
+ *  Build device list for all present ISA PnP devices.
+ */
+static int __init isapnp_build_device_list(void)
+{
+	int csn;
+	unsigned char header[9];
+	struct pnp_card *card;
+	u32 eisa_id;
+	char id[8];
+
+	isapnp_wait();
+	isapnp_key();
+	for (csn = 1; csn <= isapnp_csn_count; csn++) {
+		isapnp_wake(csn);
+		isapnp_peek(header, 9);
+		eisa_id = header[0] | header[1] << 8 |
+			  header[2] << 16 | header[3] << 24;
+		pnp_eisa_id_to_string(eisa_id, id);
+		card = pnp_alloc_card(&isapnp_protocol, csn, id);
+		if (!card)
+			continue;
+
+		INIT_LIST_HEAD(&card->devices);
+		card->serial =
+		    (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
+		    header[4];
+		isapnp_checksum_value = 0x00;
+		isapnp_parse_resource_map(card);
+		if (isapnp_checksum_value != 0x00)
+			dev_err(&card->dev, "invalid checksum %#x\n",
+				isapnp_checksum_value);
+		card->checksum = isapnp_checksum_value;
+
+		pnp_add_card(card);
+	}
+	isapnp_wait();
+	return 0;
+}
+
+/*
+ *  Basic configuration routines.
+ */
+
+int isapnp_present(void)
+{
+	struct pnp_card *card;
+
+	pnp_for_each_card(card) {
+		if (card->protocol == &isapnp_protocol)
+			return 1;
+	}
+	return 0;
+}
+
+int isapnp_cfg_begin(int csn, int logdev)
+{
+	if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
+		return -EINVAL;
+	mutex_lock(&isapnp_cfg_mutex);
+	isapnp_wait();
+	isapnp_key();
+	isapnp_wake(csn);
+#if 0
+	/* to avoid malfunction when the isapnptools package is used */
+	/* we must set RDP to our value again */
+	/* it is possible to set RDP only in the isolation phase */
+	/*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
+	isapnp_write_byte(0x02, 0x04);	/* clear CSN of card */
+	mdelay(2);		/* is this necessary? */
+	isapnp_wake(csn);	/* bring card into sleep state */
+	isapnp_wake(0);		/* bring card into isolation state */
+	isapnp_set_rdp();	/* reset the RDP port */
+	udelay(1000);		/* delay 1000us */
+	isapnp_write_byte(0x06, csn);	/* reset CSN to previous value */
+	udelay(250);		/* is this necessary? */
+#endif
+	if (logdev >= 0)
+		isapnp_device(logdev);
+	return 0;
+}
+
+int isapnp_cfg_end(void)
+{
+	isapnp_wait();
+	mutex_unlock(&isapnp_cfg_mutex);
+	return 0;
+}
+
+/*
+ *  Initialization.
+ */
+
+EXPORT_SYMBOL(isapnp_protocol);
+EXPORT_SYMBOL(isapnp_present);
+EXPORT_SYMBOL(isapnp_cfg_begin);
+EXPORT_SYMBOL(isapnp_cfg_end);
+EXPORT_SYMBOL(isapnp_write_byte);
+
+static int isapnp_get_resources(struct pnp_dev *dev)
+{
+	int i, ret;
+
+	pnp_dbg(&dev->dev, "get resources\n");
+	pnp_init_resources(dev);
+	isapnp_cfg_begin(dev->card->number, dev->number);
+	dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
+	if (!dev->active)
+		goto __end;
+
+	for (i = 0; i < ISAPNP_MAX_PORT; i++) {
+		ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1));
+		pnp_add_io_resource(dev, ret, ret,
+				    ret == 0 ? IORESOURCE_DISABLED : 0);
+	}
+	for (i = 0; i < ISAPNP_MAX_MEM; i++) {
+		ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8;
+		pnp_add_mem_resource(dev, ret, ret,
+				     ret == 0 ? IORESOURCE_DISABLED : 0);
+	}
+	for (i = 0; i < ISAPNP_MAX_IRQ; i++) {
+		ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8;
+		pnp_add_irq_resource(dev, ret,
+				     ret == 0 ? IORESOURCE_DISABLED : 0);
+	}
+	for (i = 0; i < ISAPNP_MAX_DMA; i++) {
+		ret = isapnp_read_byte(ISAPNP_CFG_DMA + i);
+		pnp_add_dma_resource(dev, ret,
+				     ret == 4 ? IORESOURCE_DISABLED : 0);
+	}
+
+__end:
+	isapnp_cfg_end();
+	return 0;
+}
+
+static int isapnp_set_resources(struct pnp_dev *dev)
+{
+	struct resource *res;
+	int tmp;
+
+	pnp_dbg(&dev->dev, "set resources\n");
+	isapnp_cfg_begin(dev->card->number, dev->number);
+	dev->active = 1;
+	for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
+		res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
+		if (pnp_resource_enabled(res)) {
+			pnp_dbg(&dev->dev, "  set io  %d to %#llx\n",
+				tmp, (unsigned long long) res->start);
+			isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
+					  res->start);
+		}
+	}
+	for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
+		res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
+		if (pnp_resource_enabled(res)) {
+			int irq = res->start;
+			if (irq == 2)
+				irq = 9;
+			pnp_dbg(&dev->dev, "  set irq %d to %d\n", tmp, irq);
+			isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
+		}
+	}
+	for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
+		res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
+		if (pnp_resource_enabled(res)) {
+			pnp_dbg(&dev->dev, "  set dma %d to %lld\n",
+				tmp, (unsigned long long) res->start);
+			isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start);
+		}
+	}
+	for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
+		res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
+		if (pnp_resource_enabled(res)) {
+			pnp_dbg(&dev->dev, "  set mem %d to %#llx\n",
+				tmp, (unsigned long long) res->start);
+			isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
+					  (res->start >> 8) & 0xffff);
+		}
+	}
+	/* FIXME: We aren't handling 32bit mems properly here */
+	isapnp_activate(dev->number);
+	isapnp_cfg_end();
+	return 0;
+}
+
+static int isapnp_disable_resources(struct pnp_dev *dev)
+{
+	if (!dev->active)
+		return -EINVAL;
+	isapnp_cfg_begin(dev->card->number, dev->number);
+	isapnp_deactivate(dev->number);
+	dev->active = 0;
+	isapnp_cfg_end();
+	return 0;
+}
+
+struct pnp_protocol isapnp_protocol = {
+	.name = "ISA Plug and Play",
+	.get = isapnp_get_resources,
+	.set = isapnp_set_resources,
+	.disable = isapnp_disable_resources,
+};
+
+static int __init isapnp_init(void)
+{
+	int cards;
+	struct pnp_card *card;
+	struct pnp_dev *dev;
+
+	if (isapnp_disable) {
+		printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
+		return 0;
+	}
+#ifdef CONFIG_PPC
+	if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
+		return -EINVAL;
+#endif
+#ifdef ISAPNP_REGION_OK
+	if (!request_region(_PIDXR, 1, "isapnp index")) {
+		printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
+		       _PIDXR);
+		return -EBUSY;
+	}
+#endif
+	if (!request_region(_PNPWRP, 1, "isapnp write")) {
+		printk(KERN_ERR
+		       "isapnp: Write Data Register 0x%x already used\n",
+		       _PNPWRP);
+#ifdef ISAPNP_REGION_OK
+		release_region(_PIDXR, 1);
+#endif
+		return -EBUSY;
+	}
+
+	if (pnp_register_protocol(&isapnp_protocol) < 0)
+		return -EBUSY;
+
+	/*
+	 *      Print a message. The existing ISAPnP code is hanging machines
+	 *      so let the user know where.
+	 */
+
+	printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
+	if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
+		isapnp_rdp |= 3;
+		if (!request_region(isapnp_rdp, 1, "isapnp read")) {
+			printk(KERN_ERR
+			       "isapnp: Read Data Register 0x%x already used\n",
+			       isapnp_rdp);
+#ifdef ISAPNP_REGION_OK
+			release_region(_PIDXR, 1);
+#endif
+			release_region(_PNPWRP, 1);
+			return -EBUSY;
+		}
+		isapnp_set_rdp();
+	}
+	if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
+		cards = isapnp_isolate();
+		if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
+#ifdef ISAPNP_REGION_OK
+			release_region(_PIDXR, 1);
+#endif
+			release_region(_PNPWRP, 1);
+			printk(KERN_INFO
+			       "isapnp: No Plug & Play device found\n");
+			return 0;
+		}
+		request_region(isapnp_rdp, 1, "isapnp read");
+	}
+	isapnp_build_device_list();
+	cards = 0;
+
+	protocol_for_each_card(&isapnp_protocol, card) {
+		cards++;
+		if (isapnp_verbose) {
+			dev_info(&card->dev, "card '%s'\n",
+			       card->name[0] ? card->name : "unknown");
+			if (isapnp_verbose < 2)
+				continue;
+			card_for_each_dev(card, dev) {
+				dev_info(&card->dev, "device '%s'\n",
+				       dev->name[0] ? dev->name : "unknown");
+			}
+		}
+	}
+	if (cards)
+		printk(KERN_INFO
+		       "isapnp: %i Plug & Play card%s detected total\n", cards,
+		       cards > 1 ? "s" : "");
+	else
+		printk(KERN_INFO "isapnp: No Plug & Play card found\n");
+
+	isapnp_proc_init();
+	return 0;
+}
+
+device_initcall(isapnp_init);
+
+/* format is: noisapnp */
+
+static int __init isapnp_setup_disable(char *str)
+{
+	isapnp_disable = 1;
+	return 1;
+}
+
+__setup("noisapnp", isapnp_setup_disable);
+
+/* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
+
+static int __init isapnp_setup_isapnp(char *str)
+{
+	(void)((get_option(&str, &isapnp_rdp) == 2) &&
+	       (get_option(&str, &isapnp_reset) == 2) &&
+	       (get_option(&str, &isapnp_verbose) == 2));
+	return 1;
+}
+
+__setup("isapnp=", isapnp_setup_isapnp);
diff --git a/drivers/pnp/isapnp/proc.c b/drivers/pnp/isapnp/proc.c
new file mode 100644
index 000000000..785a79643
--- /dev/null
+++ b/drivers/pnp/isapnp/proc.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  ISA Plug & Play support
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ */
+
+#include <linux/module.h>
+#include <linux/isapnp.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/uaccess.h>
+
+extern struct pnp_protocol isapnp_protocol;
+
+static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
+
+static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
+{
+	return fixed_size_llseek(file, off, whence, 256);
+}
+
+static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
+				    size_t nbytes, loff_t * ppos)
+{
+	struct pnp_dev *dev = PDE_DATA(file_inode(file));
+	int pos = *ppos;
+	int cnt, size = 256;
+
+	if (pos >= size)
+		return 0;
+	if (nbytes >= size)
+		nbytes = size;
+	if (pos + nbytes > size)
+		nbytes = size - pos;
+	cnt = nbytes;
+
+	if (!access_ok(buf, cnt))
+		return -EINVAL;
+
+	isapnp_cfg_begin(dev->card->number, dev->number);
+	for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
+		unsigned char val;
+		val = isapnp_read_byte(pos);
+		__put_user(val, buf);
+	}
+	isapnp_cfg_end();
+
+	*ppos = pos;
+	return nbytes;
+}
+
+static const struct proc_ops isapnp_proc_bus_proc_ops = {
+	.proc_lseek	= isapnp_proc_bus_lseek,
+	.proc_read	= isapnp_proc_bus_read,
+};
+
+static int isapnp_proc_attach_device(struct pnp_dev *dev)
+{
+	struct pnp_card *bus = dev->card;
+	struct proc_dir_entry *de, *e;
+	char name[16];
+
+	if (!(de = bus->procdir)) {
+		sprintf(name, "%02x", bus->number);
+		de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
+		if (!de)
+			return -ENOMEM;
+	}
+	sprintf(name, "%02x", dev->number);
+	e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
+					    &isapnp_proc_bus_proc_ops, dev);
+	if (!e)
+		return -ENOMEM;
+	proc_set_size(e, 256);
+	return 0;
+}
+
+int __init isapnp_proc_init(void)
+{
+	struct pnp_dev *dev;
+
+	isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
+	protocol_for_each_dev(&isapnp_protocol, dev) {
+		isapnp_proc_attach_device(dev);
+	}
+	return 0;
+}