Adding upstream version 6.1.76.upstream/6.1.76upstream

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

9 files changed, 1558 insertions, 0 deletions

diff --git a/arch/xtensa/platforms/iss/Makefile b/arch/xtensa/platforms/iss/Makefile
new file mode 100644
index 000000000..f3dd5e72a
--- /dev/null
+++ b/arch/xtensa/platforms/iss/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# $Id: Makefile,v 1.1.1.1 2002/08/28 16:10:14 aroll Exp $
+#
+# Makefile for the Xtensa Instruction Set Simulator (ISS)
+# "prom monitor" library routines under Linux.
+#
+
+obj-y			= setup.o
+obj-$(CONFIG_TTY)	+= console.o
+obj-$(CONFIG_NET)	+= network.o
+obj-$(CONFIG_BLK_DEV_SIMDISK) += simdisk.o
diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
new file mode 100644
index 000000000..10b79d3c7
--- /dev/null
+++ b/arch/xtensa/platforms/iss/console.c
@@ -0,0 +1,224 @@
+/*
+ * arch/xtensa/platforms/iss/console.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001-2005 Tensilica Inc.
+ *   Authors	Christian Zankel, Joe Taylor
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/major.h>
+#include <linux/param.h>
+#include <linux/seq_file.h>
+#include <linux/serial.h>
+
+#include <linux/uaccess.h>
+#include <asm/irq.h>
+
+#include <platform/simcall.h>
+
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#define SERIAL_MAX_NUM_LINES 1
+#define SERIAL_TIMER_VALUE (HZ / 10)
+
+static void rs_poll(struct timer_list *);
+
+static struct tty_driver *serial_driver;
+static struct tty_port serial_port;
+static DEFINE_TIMER(serial_timer, rs_poll);
+
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+	if (tty->count == 1)
+		mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
+
+	return 0;
+}
+
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+	if (tty->count == 1)
+		del_timer_sync(&serial_timer);
+}
+
+
+static int rs_write(struct tty_struct * tty,
+		    const unsigned char *buf, int count)
+{
+	/* see drivers/char/serialX.c to reference original version */
+
+	simc_write(1, buf, count);
+	return count;
+}
+
+static void rs_poll(struct timer_list *unused)
+{
+	struct tty_port *port = &serial_port;
+	int i = 0;
+	int rd = 1;
+	unsigned char c;
+
+	while (simc_poll(0)) {
+		rd = simc_read(0, &c, 1);
+		if (rd <= 0)
+			break;
+		tty_insert_flip_char(port, c, TTY_NORMAL);
+		i++;
+	}
+
+	if (i)
+		tty_flip_buffer_push(port);
+	if (rd)
+		mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
+}
+
+
+static int rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	return rs_write(tty, &ch, 1);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+}
+
+static unsigned int rs_write_room(struct tty_struct *tty)
+{
+	/* Let's say iss can always accept 2K characters.. */
+	return 2 * 1024;
+}
+
+static void rs_hangup(struct tty_struct *tty)
+{
+	/* Stub, once again.. */
+}
+
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+	/* Stub, once again.. */
+}
+
+static int rs_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "serinfo:1.0 driver:0.1\n");
+	return 0;
+}
+
+static const struct tty_operations serial_ops = {
+	.open = rs_open,
+	.close = rs_close,
+	.write = rs_write,
+	.put_char = rs_put_char,
+	.flush_chars = rs_flush_chars,
+	.write_room = rs_write_room,
+	.hangup = rs_hangup,
+	.wait_until_sent = rs_wait_until_sent,
+	.proc_show = rs_proc_show,
+};
+
+static int __init rs_init(void)
+{
+	struct tty_driver *driver;
+	int ret;
+
+	driver = tty_alloc_driver(SERIAL_MAX_NUM_LINES, TTY_DRIVER_REAL_RAW);
+	if (IS_ERR(driver))
+		return PTR_ERR(driver);
+
+	tty_port_init(&serial_port);
+
+	/* Initialize the tty_driver structure */
+
+	driver->driver_name = "iss_serial";
+	driver->name = "ttyS";
+	driver->major = TTY_MAJOR;
+	driver->minor_start = 64;
+	driver->type = TTY_DRIVER_TYPE_SERIAL;
+	driver->subtype = SERIAL_TYPE_NORMAL;
+	driver->init_termios = tty_std_termios;
+	driver->init_termios.c_cflag =
+		B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+
+	tty_set_operations(driver, &serial_ops);
+	tty_port_link_device(&serial_port, driver, 0);
+
+	ret = tty_register_driver(driver);
+	if (ret) {
+		pr_err("Couldn't register serial driver\n");
+		tty_driver_kref_put(driver);
+		tty_port_destroy(&serial_port);
+
+		return ret;
+	}
+
+	serial_driver = driver;
+
+	return 0;
+}
+
+
+static __exit void rs_exit(void)
+{
+	tty_unregister_driver(serial_driver);
+	tty_driver_kref_put(serial_driver);
+	tty_port_destroy(&serial_port);
+}
+
+
+/* We use `late_initcall' instead of just `__initcall' as a workaround for
+ * the fact that (1) simcons_tty_init can't be called before tty_init,
+ * (2) tty_init is called via `module_init', (3) if statically linked,
+ * module_init == device_init, and (4) there's no ordering of init lists.
+ * We can do this easily because simcons is always statically linked, but
+ * other tty drivers that depend on tty_init and which must use
+ * `module_init' to declare their init routines are likely to be broken.
+ */
+
+late_initcall(rs_init);
+
+
+#ifdef CONFIG_SERIAL_CONSOLE
+
+static void iss_console_write(struct console *co, const char *s, unsigned count)
+{
+	if (s && *s != 0) {
+		int len = strlen(s);
+		simc_write(1, s, count < len ? count : len);
+	}
+}
+
+static struct tty_driver* iss_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return serial_driver;
+}
+
+
+static struct console sercons = {
+	.name = "ttyS",
+	.write = iss_console_write,
+	.device = iss_console_device,
+	.flags = CON_PRINTBUFFER,
+	.index = -1
+};
+
+static int __init iss_console_init(void)
+{
+	register_console(&sercons);
+	return 0;
+}
+
+console_initcall(iss_console_init);
+
+#endif /* CONFIG_SERIAL_CONSOLE */
+
diff --git a/arch/xtensa/platforms/iss/include/platform/serial.h b/arch/xtensa/platforms/iss/include/platform/serial.h
new file mode 100644
index 000000000..16aec542d
--- /dev/null
+++ b/arch/xtensa/platforms/iss/include/platform/serial.h
@@ -0,0 +1,15 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 Tensilica Inc.
+ */
+
+#ifndef __ASM_XTENSA_ISS_SERIAL_H
+#define __ASM_XTENSA_ISS_SERIAL_H
+
+/* Have no meaning on ISS, but needed for 8250_early.c */
+#define BASE_BAUD 0
+
+#endif /* __ASM_XTENSA_ISS_SERIAL_H */
diff --git a/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h b/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h
new file mode 100644
index 000000000..e642860e2
--- /dev/null
+++ b/arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Cadence Design Systems Inc. */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
+
+/*
+ *  System call like services offered by the GDBIO host.
+ */
+
+#define SYS_open	-2
+#define SYS_close	-3
+#define SYS_read	-4
+#define SYS_write	-5
+#define SYS_lseek	-6
+
+static int errno;
+
+static inline int __simc(int a, int b, int c, int d)
+{
+	register int a1 asm("a2") = a;
+	register int b1 asm("a6") = b;
+	register int c1 asm("a3") = c;
+	register int d1 asm("a4") = d;
+	__asm__ __volatile__ (
+			"break 1, 14\n"
+			: "+r"(a1), "+r"(c1)
+			: "r"(b1), "r"(d1)
+			: "memory");
+	errno = c1;
+	return a1;
+}
+
+#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H */
diff --git a/arch/xtensa/platforms/iss/include/platform/simcall-iss.h b/arch/xtensa/platforms/iss/include/platform/simcall-iss.h
new file mode 100644
index 000000000..5a1e7a1f1
--- /dev/null
+++ b/arch/xtensa/platforms/iss/include/platform/simcall-iss.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2021 Cadence Design Systems Inc. */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
+
+/*
+ *  System call like services offered by the simulator host.
+ */
+
+#define SYS_nop		0	/* unused */
+#define SYS_exit	1	/*x*/
+#define SYS_fork	2
+#define SYS_read	3	/*x*/
+#define SYS_write	4	/*x*/
+#define SYS_open	5	/*x*/
+#define SYS_close	6	/*x*/
+#define SYS_rename	7	/*x 38 - waitpid */
+#define SYS_creat	8	/*x*/
+#define SYS_link	9	/*x (not implemented on WIN32) */
+#define SYS_unlink	10	/*x*/
+#define SYS_execv	11	/* n/a - execve */
+#define SYS_execve	12	/* 11 - chdir */
+#define SYS_pipe	13	/* 42 - time */
+#define SYS_stat	14	/* 106 - mknod */
+#define SYS_chmod	15
+#define SYS_chown	16	/* 202 - lchown */
+#define SYS_utime	17	/* 30 - break */
+#define SYS_wait	18	/* n/a - oldstat */
+#define SYS_lseek	19	/*x*/
+#define SYS_getpid	20
+#define SYS_isatty	21	/* n/a - mount */
+#define SYS_fstat	22	/* 108 - oldumount */
+#define SYS_time	23	/* 13 - setuid */
+#define SYS_gettimeofday 24	/*x 78 - getuid (not implemented on WIN32) */
+#define SYS_times	25	/*X 43 - stime (Xtensa-specific implementation) */
+#define SYS_socket      26
+#define SYS_sendto      27
+#define SYS_recvfrom    28
+#define SYS_select_one  29      /* not compatible select, one file descriptor at the time */
+#define SYS_bind        30
+#define SYS_ioctl	31
+
+#define SYS_iss_argc	1000	/* returns value of argc */
+#define SYS_iss_argv_size 1001	/* bytes needed for argv & arg strings */
+#define SYS_iss_set_argv 1002	/* saves argv & arg strings at given addr */
+
+/*
+ * SYS_select_one specifiers
+ */
+
+#define  XTISS_SELECT_ONE_READ    1
+#define  XTISS_SELECT_ONE_WRITE   2
+#define  XTISS_SELECT_ONE_EXCEPT  3
+
+static int errno;
+
+static inline int __simc(int a, int b, int c, int d)
+{
+	register int a1 asm("a2") = a;
+	register int b1 asm("a3") = b;
+	register int c1 asm("a4") = c;
+	register int d1 asm("a5") = d;
+	__asm__ __volatile__ (
+			"simcall\n"
+			: "+r"(a1), "+r"(b1)
+			: "r"(c1), "r"(d1)
+			: "memory");
+	errno = b1;
+	return a1;
+}
+
+#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H */
diff --git a/arch/xtensa/platforms/iss/include/platform/simcall.h b/arch/xtensa/platforms/iss/include/platform/simcall.h
new file mode 100644
index 000000000..e1ec50ce3
--- /dev/null
+++ b/arch/xtensa/platforms/iss/include/platform/simcall.h
@@ -0,0 +1,110 @@
+/*
+ * include/asm-xtensa/platform-iss/simcall.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 Tensilica Inc.
+ * Copyright (C) 2017 - 2021 Cadence Design Systems Inc.
+ */
+
+#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_H
+#define _XTENSA_PLATFORM_ISS_SIMCALL_H
+
+#include <linux/bug.h>
+
+#ifdef CONFIG_XTENSA_SIMCALL_ISS
+#include <platform/simcall-iss.h>
+#endif
+#ifdef CONFIG_XTENSA_SIMCALL_GDBIO
+#include <platform/simcall-gdbio.h>
+#endif
+
+static inline int simc_exit(int exit_code)
+{
+#ifdef SYS_exit
+	return __simc(SYS_exit, exit_code, 0, 0);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+	return -1;
+#endif
+}
+
+static inline int simc_open(const char *file, int flags, int mode)
+{
+	return __simc(SYS_open, (int) file, flags, mode);
+}
+
+static inline int simc_close(int fd)
+{
+	return __simc(SYS_close, fd, 0, 0);
+}
+
+static inline int simc_ioctl(int fd, int request, void *arg)
+{
+#ifdef SYS_ioctl
+	return __simc(SYS_ioctl, fd, request, (int) arg);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+	return -1;
+#endif
+}
+
+static inline int simc_read(int fd, void *buf, size_t count)
+{
+	return __simc(SYS_read, fd, (int) buf, count);
+}
+
+static inline int simc_write(int fd, const void *buf, size_t count)
+{
+	return __simc(SYS_write, fd, (int) buf, count);
+}
+
+static inline int simc_poll(int fd)
+{
+#ifdef SYS_select_one
+	long timeval[2] = { 0, 0 };
+
+	return __simc(SYS_select_one, fd, XTISS_SELECT_ONE_READ, (int)&timeval);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+	return -1;
+#endif
+}
+
+static inline int simc_lseek(int fd, uint32_t off, int whence)
+{
+	return __simc(SYS_lseek, fd, off, whence);
+}
+
+static inline int simc_argc(void)
+{
+#ifdef SYS_iss_argc
+	return __simc(SYS_iss_argc, 0, 0, 0);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+	return 0;
+#endif
+}
+
+static inline int simc_argv_size(void)
+{
+#ifdef SYS_iss_argv_size
+	return __simc(SYS_iss_argv_size, 0, 0, 0);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+	return 0;
+#endif
+}
+
+static inline void simc_argv(void *buf)
+{
+#ifdef SYS_iss_set_argv
+	__simc(SYS_iss_set_argv, (int)buf, 0, 0);
+#else
+	WARN_ONCE(1, "%s: not implemented\n", __func__);
+#endif
+}
+
+#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_H */
diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
new file mode 100644
index 000000000..bea539f90
--- /dev/null
+++ b/arch/xtensa/platforms/iss/network.c
@@ -0,0 +1,640 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * arch/xtensa/platforms/iss/network.c
+ *
+ * Platform specific initialization.
+ *
+ * Authors: Chris Zankel <chris@zankel.net>
+ * Based on work form the UML team.
+ *
+ * Copyright 2005 Tensilica Inc.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/list.h>
+#include <linux/irq.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/if_ether.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/if_tun.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+#include <linux/memblock.h>
+#include <linux/ethtool.h>
+#include <linux/rtnetlink.h>
+#include <linux/platform_device.h>
+
+#include <platform/simcall.h>
+
+#define DRIVER_NAME "iss-netdev"
+#define ETH_MAX_PACKET 1500
+#define ETH_HEADER_OTHER 14
+#define ISS_NET_TIMER_VALUE (HZ / 10)
+
+/* ------------------------------------------------------------------------- */
+
+/* We currently only support the TUNTAP transport protocol. */
+
+#define TRANSPORT_TUNTAP_NAME "tuntap"
+#define TRANSPORT_TUNTAP_MTU ETH_MAX_PACKET
+
+struct tuntap_info {
+	char dev_name[IFNAMSIZ];
+	int fd;
+};
+
+/* ------------------------------------------------------------------------- */
+
+
+struct iss_net_private;
+
+struct iss_net_ops {
+	int (*open)(struct iss_net_private *lp);
+	void (*close)(struct iss_net_private *lp);
+	int (*read)(struct iss_net_private *lp, struct sk_buff **skb);
+	int (*write)(struct iss_net_private *lp, struct sk_buff **skb);
+	unsigned short (*protocol)(struct sk_buff *skb);
+	int (*poll)(struct iss_net_private *lp);
+};
+
+/* This structure contains out private information for the driver. */
+
+struct iss_net_private {
+	spinlock_t lock;
+	struct net_device *dev;
+	struct platform_device pdev;
+	struct timer_list tl;
+	struct rtnl_link_stats64 stats;
+
+	struct timer_list timer;
+	unsigned int timer_val;
+
+	int index;
+	int mtu;
+
+	struct {
+		union {
+			struct tuntap_info tuntap;
+		} info;
+
+		const struct iss_net_ops *net_ops;
+	} tp;
+
+};
+
+/* ================================ HELPERS ================================ */
+
+
+static char *split_if_spec(char *str, ...)
+{
+	char **arg, *end;
+	va_list ap;
+
+	va_start(ap, str);
+	while ((arg = va_arg(ap, char**)) != NULL) {
+		if (*str == '\0') {
+			va_end(ap);
+			return NULL;
+		}
+		end = strchr(str, ',');
+		if (end != str)
+			*arg = str;
+		if (end == NULL) {
+			va_end(ap);
+			return NULL;
+		}
+		*end++ = '\0';
+		str = end;
+	}
+	va_end(ap);
+	return str;
+}
+
+/* Set Ethernet address of the specified device. */
+
+static void setup_etheraddr(struct net_device *dev, char *str)
+{
+	u8 addr[ETH_ALEN];
+
+	if (str == NULL)
+		goto random;
+
+	if (!mac_pton(str, addr)) {
+		pr_err("%s: failed to parse '%s' as an ethernet address\n",
+		       dev->name, str);
+		goto random;
+	}
+	if (is_multicast_ether_addr(addr)) {
+		pr_err("%s: attempt to assign a multicast ethernet address\n",
+		       dev->name);
+		goto random;
+	}
+	if (!is_valid_ether_addr(addr)) {
+		pr_err("%s: attempt to assign an invalid ethernet address\n",
+		       dev->name);
+		goto random;
+	}
+	if (!is_local_ether_addr(addr))
+		pr_warn("%s: assigning a globally valid ethernet address\n",
+			dev->name);
+	eth_hw_addr_set(dev, addr);
+	return;
+
+random:
+	pr_info("%s: choosing a random ethernet address\n",
+		dev->name);
+	eth_hw_addr_random(dev);
+}
+
+/* ======================= TUNTAP TRANSPORT INTERFACE ====================== */
+
+static int tuntap_open(struct iss_net_private *lp)
+{
+	struct ifreq ifr;
+	char *dev_name = lp->tp.info.tuntap.dev_name;
+	int err = -EINVAL;
+	int fd;
+
+	fd = simc_open("/dev/net/tun", 02, 0); /* O_RDWR */
+	if (fd < 0) {
+		pr_err("%s: failed to open /dev/net/tun, returned %d (errno = %d)\n",
+		       lp->dev->name, fd, errno);
+		return fd;
+	}
+
+	memset(&ifr, 0, sizeof(ifr));
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+	strscpy(ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
+
+	err = simc_ioctl(fd, TUNSETIFF, &ifr);
+	if (err < 0) {
+		pr_err("%s: failed to set interface %s, returned %d (errno = %d)\n",
+		       lp->dev->name, dev_name, err, errno);
+		simc_close(fd);
+		return err;
+	}
+
+	lp->tp.info.tuntap.fd = fd;
+	return err;
+}
+
+static void tuntap_close(struct iss_net_private *lp)
+{
+	simc_close(lp->tp.info.tuntap.fd);
+	lp->tp.info.tuntap.fd = -1;
+}
+
+static int tuntap_read(struct iss_net_private *lp, struct sk_buff **skb)
+{
+	return simc_read(lp->tp.info.tuntap.fd,
+			(*skb)->data, (*skb)->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int tuntap_write(struct iss_net_private *lp, struct sk_buff **skb)
+{
+	return simc_write(lp->tp.info.tuntap.fd, (*skb)->data, (*skb)->len);
+}
+
+static unsigned short tuntap_protocol(struct sk_buff *skb)
+{
+	return eth_type_trans(skb, skb->dev);
+}
+
+static int tuntap_poll(struct iss_net_private *lp)
+{
+	return simc_poll(lp->tp.info.tuntap.fd);
+}
+
+static const struct iss_net_ops tuntap_ops = {
+	.open		= tuntap_open,
+	.close		= tuntap_close,
+	.read		= tuntap_read,
+	.write		= tuntap_write,
+	.protocol	= tuntap_protocol,
+	.poll		= tuntap_poll,
+};
+
+/*
+ * ethX=tuntap,[mac address],device name
+ */
+
+static int tuntap_probe(struct iss_net_private *lp, int index, char *init)
+{
+	struct net_device *dev = lp->dev;
+	char *dev_name = NULL, *mac_str = NULL, *rem = NULL;
+
+	/* Transport should be 'tuntap': ethX=tuntap,mac,dev_name */
+
+	if (strncmp(init, TRANSPORT_TUNTAP_NAME,
+		    sizeof(TRANSPORT_TUNTAP_NAME) - 1))
+		return 0;
+
+	init += sizeof(TRANSPORT_TUNTAP_NAME) - 1;
+	if (*init == ',') {
+		rem = split_if_spec(init + 1, &mac_str, &dev_name, NULL);
+		if (rem != NULL) {
+			pr_err("%s: extra garbage on specification : '%s'\n",
+			       dev->name, rem);
+			return 0;
+		}
+	} else if (*init != '\0') {
+		pr_err("%s: invalid argument: %s. Skipping device!\n",
+		       dev->name, init);
+		return 0;
+	}
+
+	if (!dev_name) {
+		pr_err("%s: missing tuntap device name\n", dev->name);
+		return 0;
+	}
+
+	strscpy(lp->tp.info.tuntap.dev_name, dev_name,
+		sizeof(lp->tp.info.tuntap.dev_name));
+
+	setup_etheraddr(dev, mac_str);
+
+	lp->mtu = TRANSPORT_TUNTAP_MTU;
+
+	lp->tp.info.tuntap.fd = -1;
+	lp->tp.net_ops = &tuntap_ops;
+
+	return 1;
+}
+
+/* ================================ ISS NET ================================ */
+
+static int iss_net_rx(struct net_device *dev)
+{
+	struct iss_net_private *lp = netdev_priv(dev);
+	int pkt_len;
+	struct sk_buff *skb;
+
+	/* Check if there is any new data. */
+
+	if (lp->tp.net_ops->poll(lp) == 0)
+		return 0;
+
+	/* Try to allocate memory, if it fails, try again next round. */
+
+	skb = dev_alloc_skb(dev->mtu + 2 + ETH_HEADER_OTHER);
+	if (skb == NULL) {
+		spin_lock_bh(&lp->lock);
+		lp->stats.rx_dropped++;
+		spin_unlock_bh(&lp->lock);
+		return 0;
+	}
+
+	skb_reserve(skb, 2);
+
+	/* Setup skb */
+
+	skb->dev = dev;
+	skb_reset_mac_header(skb);
+	pkt_len = lp->tp.net_ops->read(lp, &skb);
+	skb_put(skb, pkt_len);
+
+	if (pkt_len > 0) {
+		skb_trim(skb, pkt_len);
+		skb->protocol = lp->tp.net_ops->protocol(skb);
+
+		spin_lock_bh(&lp->lock);
+		lp->stats.rx_bytes += skb->len;
+		lp->stats.rx_packets++;
+		spin_unlock_bh(&lp->lock);
+		netif_rx(skb);
+		return pkt_len;
+	}
+	kfree_skb(skb);
+	return pkt_len;
+}
+
+static int iss_net_poll(struct iss_net_private *lp)
+{
+	int err, ret = 0;
+
+	if (!netif_running(lp->dev))
+		return 0;
+
+	while ((err = iss_net_rx(lp->dev)) > 0)
+		ret++;
+
+	if (err < 0) {
+		pr_err("Device '%s' read returned %d, shutting it down\n",
+		       lp->dev->name, err);
+		dev_close(lp->dev);
+	} else {
+		/* FIXME reactivate_fd(lp->fd, ISS_ETH_IRQ); */
+	}
+
+	return ret;
+}
+
+
+static void iss_net_timer(struct timer_list *t)
+{
+	struct iss_net_private *lp = from_timer(lp, t, timer);
+
+	iss_net_poll(lp);
+	mod_timer(&lp->timer, jiffies + lp->timer_val);
+}
+
+
+static int iss_net_open(struct net_device *dev)
+{
+	struct iss_net_private *lp = netdev_priv(dev);
+	int err;
+
+	err = lp->tp.net_ops->open(lp);
+	if (err < 0)
+		return err;
+
+	netif_start_queue(dev);
+
+	/* clear buffer - it can happen that the host side of the interface
+	 * is full when we get here. In this case, new data is never queued,
+	 * SIGIOs never arrive, and the net never works.
+	 */
+	while ((err = iss_net_rx(dev)) > 0)
+		;
+
+	timer_setup(&lp->timer, iss_net_timer, 0);
+	lp->timer_val = ISS_NET_TIMER_VALUE;
+	mod_timer(&lp->timer, jiffies + lp->timer_val);
+
+	return err;
+}
+
+static int iss_net_close(struct net_device *dev)
+{
+	struct iss_net_private *lp = netdev_priv(dev);
+
+	netif_stop_queue(dev);
+	del_timer_sync(&lp->timer);
+	lp->tp.net_ops->close(lp);
+
+	return 0;
+}
+
+static int iss_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct iss_net_private *lp = netdev_priv(dev);
+	int len;
+
+	netif_stop_queue(dev);
+
+	len = lp->tp.net_ops->write(lp, &skb);
+
+	if (len == skb->len) {
+		spin_lock_bh(&lp->lock);
+		lp->stats.tx_packets++;
+		lp->stats.tx_bytes += skb->len;
+		spin_unlock_bh(&lp->lock);
+		netif_trans_update(dev);
+		netif_start_queue(dev);
+
+		/* this is normally done in the interrupt when tx finishes */
+		netif_wake_queue(dev);
+
+	} else if (len == 0) {
+		netif_start_queue(dev);
+		spin_lock_bh(&lp->lock);
+		lp->stats.tx_dropped++;
+		spin_unlock_bh(&lp->lock);
+
+	} else {
+		netif_start_queue(dev);
+		pr_err("%s: %s failed(%d)\n", dev->name, __func__, len);
+	}
+
+
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+
+static void iss_net_get_stats64(struct net_device *dev,
+				struct rtnl_link_stats64 *stats)
+{
+	struct iss_net_private *lp = netdev_priv(dev);
+
+	spin_lock_bh(&lp->lock);
+	*stats = lp->stats;
+	spin_unlock_bh(&lp->lock);
+}
+
+static void iss_net_set_multicast_list(struct net_device *dev)
+{
+}
+
+static void iss_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+}
+
+static int iss_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+	return -EINVAL;
+}
+
+static void iss_net_user_timer_expire(struct timer_list *unused)
+{
+}
+
+
+static struct platform_driver iss_net_driver = {
+	.driver = {
+		.name  = DRIVER_NAME,
+	},
+};
+
+static int driver_registered;
+
+static const struct net_device_ops iss_netdev_ops = {
+	.ndo_open		= iss_net_open,
+	.ndo_stop		= iss_net_close,
+	.ndo_get_stats64	= iss_net_get_stats64,
+	.ndo_start_xmit		= iss_net_start_xmit,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_change_mtu		= iss_net_change_mtu,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_tx_timeout		= iss_net_tx_timeout,
+	.ndo_set_rx_mode	= iss_net_set_multicast_list,
+};
+
+static void iss_net_pdev_release(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iss_net_private *lp =
+		container_of(pdev, struct iss_net_private, pdev);
+
+	free_netdev(lp->dev);
+}
+
+static void iss_net_configure(int index, char *init)
+{
+	struct net_device *dev;
+	struct iss_net_private *lp;
+
+	dev = alloc_etherdev(sizeof(*lp));
+	if (dev == NULL) {
+		pr_err("eth_configure: failed to allocate device\n");
+		return;
+	}
+
+	/* Initialize private element. */
+
+	lp = netdev_priv(dev);
+	*lp = (struct iss_net_private) {
+		.dev			= dev,
+		.index			= index,
+	};
+
+	spin_lock_init(&lp->lock);
+	/*
+	 * If this name ends up conflicting with an existing registered
+	 * netdevice, that is OK, register_netdev{,ice}() will notice this
+	 * and fail.
+	 */
+	snprintf(dev->name, sizeof(dev->name), "eth%d", index);
+
+	/*
+	 * Try all transport protocols.
+	 * Note: more protocols can be added by adding '&& !X_init(lp, eth)'.
+	 */
+
+	if (!tuntap_probe(lp, index, init)) {
+		pr_err("%s: invalid arguments. Skipping device!\n",
+		       dev->name);
+		goto err_free_netdev;
+	}
+
+	pr_info("Netdevice %d (%pM)\n", index, dev->dev_addr);
+
+	/* sysfs register */
+
+	if (!driver_registered) {
+		if (platform_driver_register(&iss_net_driver))
+			goto err_free_netdev;
+		driver_registered = 1;
+	}
+
+	lp->pdev.id = index;
+	lp->pdev.name = DRIVER_NAME;
+	lp->pdev.dev.release = iss_net_pdev_release;
+	if (platform_device_register(&lp->pdev))
+		goto err_free_netdev;
+	SET_NETDEV_DEV(dev, &lp->pdev.dev);
+
+	dev->netdev_ops = &iss_netdev_ops;
+	dev->mtu = lp->mtu;
+	dev->watchdog_timeo = (HZ >> 1);
+	dev->irq = -1;
+
+	rtnl_lock();
+	if (register_netdevice(dev)) {
+		rtnl_unlock();
+		pr_err("%s: error registering net device!\n", dev->name);
+		platform_device_unregister(&lp->pdev);
+		return;
+	}
+	rtnl_unlock();
+
+	timer_setup(&lp->tl, iss_net_user_timer_expire, 0);
+
+	return;
+
+err_free_netdev:
+	free_netdev(dev);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* Filled in during early boot */
+
+struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
+
+struct iss_net_init {
+	struct list_head list;
+	char *init;		/* init string */
+	int index;
+};
+
+/*
+ * Parse the command line and look for 'ethX=...' fields, and register all
+ * those fields. They will be later initialized in iss_net_init.
+ */
+
+static int __init iss_net_setup(char *str)
+{
+	struct iss_net_init *device = NULL;
+	struct iss_net_init *new;
+	struct list_head *ele;
+	char *end;
+	int rc;
+	unsigned n;
+
+	end = strchr(str, '=');
+	if (!end) {
+		pr_err("Expected '=' after device number\n");
+		return 1;
+	}
+	*end = 0;
+	rc = kstrtouint(str, 0, &n);
+	*end = '=';
+	if (rc < 0) {
+		pr_err("Failed to parse '%s'\n", str);
+		return 1;
+	}
+	str = end;
+
+	list_for_each(ele, &eth_cmd_line) {
+		device = list_entry(ele, struct iss_net_init, list);
+		if (device->index == n)
+			break;
+	}
+
+	if (device && device->index == n) {
+		pr_err("Device %u already configured\n", n);
+		return 1;
+	}
+
+	new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
+	if (new == NULL) {
+		pr_err("Alloc_bootmem failed\n");
+		return 1;
+	}
+
+	INIT_LIST_HEAD(&new->list);
+	new->index = n;
+	new->init = str + 1;
+
+	list_add_tail(&new->list, &eth_cmd_line);
+	return 1;
+}
+
+__setup("eth", iss_net_setup);
+
+/*
+ * Initialize all ISS Ethernet devices previously registered in iss_net_setup.
+ */
+
+static int iss_net_init(void)
+{
+	struct list_head *ele, *next;
+
+	/* Walk through all Ethernet devices specified in the command line. */
+
+	list_for_each_safe(ele, next, &eth_cmd_line) {
+		struct iss_net_init *eth;
+		eth = list_entry(ele, struct iss_net_init, list);
+		iss_net_configure(eth->index, eth->init);
+	}
+
+	return 1;
+}
+device_initcall(iss_net_init);
diff --git a/arch/xtensa/platforms/iss/setup.c b/arch/xtensa/platforms/iss/setup.c
new file mode 100644
index 000000000..d3433e1bb
--- /dev/null
+++ b/arch/xtensa/platforms/iss/setup.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * arch/xtensa/platform-iss/setup.c
+ *
+ * Platform specific initialization.
+ *
+ * Authors: Chris Zankel <chris@zankel.net>
+ *          Joe Taylor <joe@tensilica.com>
+ *
+ * Copyright 2001 - 2005 Tensilica Inc.
+ * Copyright 2017 Cadence Design Systems Inc.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/panic_notifier.h>
+#include <linux/printk.h>
+#include <linux/string.h>
+
+#include <asm/platform.h>
+#include <asm/setup.h>
+
+#include <platform/simcall.h>
+
+
+void platform_halt(void)
+{
+	pr_info(" ** Called platform_halt() **\n");
+	simc_exit(0);
+}
+
+void platform_power_off(void)
+{
+	pr_info(" ** Called platform_power_off() **\n");
+	simc_exit(0);
+}
+
+void platform_restart(void)
+{
+	/* Flush and reset the mmu, simulate a processor reset, and
+	 * jump to the reset vector. */
+	cpu_reset();
+	/* control never gets here */
+}
+
+static int
+iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	simc_exit(1);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block iss_panic_block = {
+	.notifier_call = iss_panic_event,
+};
+
+void __init platform_setup(char **p_cmdline)
+{
+	static void *argv[COMMAND_LINE_SIZE / sizeof(void *)] __initdata;
+	static char cmdline[COMMAND_LINE_SIZE] __initdata;
+	int argc = simc_argc();
+	int argv_size = simc_argv_size();
+
+	if (argc > 1) {
+		if (argv_size > sizeof(argv)) {
+			pr_err("%s: command line too long: argv_size = %d\n",
+			       __func__, argv_size);
+		} else {
+			int i;
+
+			cmdline[0] = 0;
+			simc_argv((void *)argv);
+
+			for (i = 1; i < argc; ++i) {
+				if (i > 1)
+					strcat(cmdline, " ");
+				strcat(cmdline, argv[i]);
+			}
+			*p_cmdline = cmdline;
+		}
+	}
+
+	atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
+}
diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c
new file mode 100644
index 000000000..f50caaa1c
--- /dev/null
+++ b/arch/xtensa/platforms/iss/simdisk.c
@@ -0,0 +1,366 @@
+/*
+ * arch/xtensa/platforms/iss/simdisk.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001-2013 Tensilica Inc.
+ *   Authors	Victor Prupis
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <platform/simcall.h>
+
+#define SIMDISK_MAJOR 240
+#define SIMDISK_MINORS 1
+#define MAX_SIMDISK_COUNT 10
+
+struct simdisk {
+	const char *filename;
+	spinlock_t lock;
+	struct gendisk *gd;
+	struct proc_dir_entry *procfile;
+	int users;
+	unsigned long size;
+	int fd;
+};
+
+
+static int simdisk_count = CONFIG_BLK_DEV_SIMDISK_COUNT;
+module_param(simdisk_count, int, S_IRUGO);
+MODULE_PARM_DESC(simdisk_count, "Number of simdisk units.");
+
+static int n_files;
+static const char *filename[MAX_SIMDISK_COUNT] = {
+#ifdef CONFIG_SIMDISK0_FILENAME
+	CONFIG_SIMDISK0_FILENAME,
+#ifdef CONFIG_SIMDISK1_FILENAME
+	CONFIG_SIMDISK1_FILENAME,
+#endif
+#endif
+};
+
+static int simdisk_param_set_filename(const char *val,
+		const struct kernel_param *kp)
+{
+	if (n_files < ARRAY_SIZE(filename))
+		filename[n_files++] = val;
+	else
+		return -EINVAL;
+	return 0;
+}
+
+static const struct kernel_param_ops simdisk_param_ops_filename = {
+	.set = simdisk_param_set_filename,
+};
+module_param_cb(filename, &simdisk_param_ops_filename, &n_files, 0);
+MODULE_PARM_DESC(filename, "Backing storage filename.");
+
+static int simdisk_major = SIMDISK_MAJOR;
+
+static void simdisk_transfer(struct simdisk *dev, unsigned long sector,
+		unsigned long nsect, char *buffer, int write)
+{
+	unsigned long offset = sector << SECTOR_SHIFT;
+	unsigned long nbytes = nsect << SECTOR_SHIFT;
+
+	if (offset > dev->size || dev->size - offset < nbytes) {
+		pr_notice("Beyond-end %s (%ld %ld)\n",
+				write ? "write" : "read", offset, nbytes);
+		return;
+	}
+
+	spin_lock(&dev->lock);
+	while (nbytes > 0) {
+		unsigned long io;
+
+		simc_lseek(dev->fd, offset, SEEK_SET);
+		READ_ONCE(*buffer);
+		if (write)
+			io = simc_write(dev->fd, buffer, nbytes);
+		else
+			io = simc_read(dev->fd, buffer, nbytes);
+		if (io == -1) {
+			pr_err("SIMDISK: IO error %d\n", errno);
+			break;
+		}
+		buffer += io;
+		offset += io;
+		nbytes -= io;
+	}
+	spin_unlock(&dev->lock);
+}
+
+static void simdisk_submit_bio(struct bio *bio)
+{
+	struct simdisk *dev = bio->bi_bdev->bd_disk->private_data;
+	struct bio_vec bvec;
+	struct bvec_iter iter;
+	sector_t sector = bio->bi_iter.bi_sector;
+
+	bio_for_each_segment(bvec, bio, iter) {
+		char *buffer = bvec_kmap_local(&bvec);
+		unsigned len = bvec.bv_len >> SECTOR_SHIFT;
+
+		simdisk_transfer(dev, sector, len, buffer,
+				bio_data_dir(bio) == WRITE);
+		sector += len;
+		kunmap_local(buffer);
+	}
+
+	bio_endio(bio);
+}
+
+static int simdisk_open(struct block_device *bdev, fmode_t mode)
+{
+	struct simdisk *dev = bdev->bd_disk->private_data;
+
+	spin_lock(&dev->lock);
+	++dev->users;
+	spin_unlock(&dev->lock);
+	return 0;
+}
+
+static void simdisk_release(struct gendisk *disk, fmode_t mode)
+{
+	struct simdisk *dev = disk->private_data;
+	spin_lock(&dev->lock);
+	--dev->users;
+	spin_unlock(&dev->lock);
+}
+
+static const struct block_device_operations simdisk_ops = {
+	.owner		= THIS_MODULE,
+	.submit_bio	= simdisk_submit_bio,
+	.open		= simdisk_open,
+	.release	= simdisk_release,
+};
+
+static struct simdisk *sddev;
+static struct proc_dir_entry *simdisk_procdir;
+
+static int simdisk_attach(struct simdisk *dev, const char *filename)
+{
+	int err = 0;
+
+	filename = kstrdup(filename, GFP_KERNEL);
+	if (filename == NULL)
+		return -ENOMEM;
+
+	spin_lock(&dev->lock);
+
+	if (dev->fd != -1) {
+		err = -EBUSY;
+		goto out;
+	}
+	dev->fd = simc_open(filename, O_RDWR, 0);
+	if (dev->fd == -1) {
+		pr_err("SIMDISK: Can't open %s: %d\n", filename, errno);
+		err = -ENODEV;
+		goto out;
+	}
+	dev->size = simc_lseek(dev->fd, 0, SEEK_END);
+	set_capacity(dev->gd, dev->size >> SECTOR_SHIFT);
+	dev->filename = filename;
+	pr_info("SIMDISK: %s=%s\n", dev->gd->disk_name, dev->filename);
+out:
+	if (err)
+		kfree(filename);
+	spin_unlock(&dev->lock);
+
+	return err;
+}
+
+static int simdisk_detach(struct simdisk *dev)
+{
+	int err = 0;
+
+	spin_lock(&dev->lock);
+
+	if (dev->users != 0) {
+		err = -EBUSY;
+	} else if (dev->fd != -1) {
+		if (simc_close(dev->fd)) {
+			pr_err("SIMDISK: error closing %s: %d\n",
+					dev->filename, errno);
+			err = -EIO;
+		} else {
+			pr_info("SIMDISK: %s detached from %s\n",
+					dev->gd->disk_name, dev->filename);
+			dev->fd = -1;
+			kfree(dev->filename);
+			dev->filename = NULL;
+		}
+	}
+	spin_unlock(&dev->lock);
+	return err;
+}
+
+static ssize_t proc_read_simdisk(struct file *file, char __user *buf,
+			size_t size, loff_t *ppos)
+{
+	struct simdisk *dev = pde_data(file_inode(file));
+	const char *s = dev->filename;
+	if (s) {
+		ssize_t len = strlen(s);
+		char *temp = kmalloc(len + 2, GFP_KERNEL);
+
+		if (!temp)
+			return -ENOMEM;
+
+		len = scnprintf(temp, len + 2, "%s\n", s);
+		len = simple_read_from_buffer(buf, size, ppos,
+					      temp, len);
+
+		kfree(temp);
+		return len;
+	}
+	return simple_read_from_buffer(buf, size, ppos, "\n", 1);
+}
+
+static ssize_t proc_write_simdisk(struct file *file, const char __user *buf,
+			size_t count, loff_t *ppos)
+{
+	char *tmp = memdup_user_nul(buf, count);
+	struct simdisk *dev = pde_data(file_inode(file));
+	int err;
+
+	if (IS_ERR(tmp))
+		return PTR_ERR(tmp);
+
+	err = simdisk_detach(dev);
+	if (err != 0)
+		goto out_free;
+
+	if (count > 0 && tmp[count - 1] == '\n')
+		tmp[count - 1] = 0;
+
+	if (tmp[0])
+		err = simdisk_attach(dev, tmp);
+
+	if (err == 0)
+		err = count;
+out_free:
+	kfree(tmp);
+	return err;
+}
+
+static const struct proc_ops simdisk_proc_ops = {
+	.proc_read	= proc_read_simdisk,
+	.proc_write	= proc_write_simdisk,
+	.proc_lseek	= default_llseek,
+};
+
+static int __init simdisk_setup(struct simdisk *dev, int which,
+		struct proc_dir_entry *procdir)
+{
+	char tmp[2] = { '0' + which, 0 };
+	int err = -ENOMEM;
+
+	dev->fd = -1;
+	dev->filename = NULL;
+	spin_lock_init(&dev->lock);
+	dev->users = 0;
+
+	dev->gd = blk_alloc_disk(NUMA_NO_NODE);
+	if (!dev->gd)
+		goto out;
+	dev->gd->major = simdisk_major;
+	dev->gd->first_minor = which;
+	dev->gd->minors = SIMDISK_MINORS;
+	dev->gd->fops = &simdisk_ops;
+	dev->gd->private_data = dev;
+	snprintf(dev->gd->disk_name, 32, "simdisk%d", which);
+	set_capacity(dev->gd, 0);
+	err = add_disk(dev->gd);
+	if (err)
+		goto out_cleanup_disk;
+
+	dev->procfile = proc_create_data(tmp, 0644, procdir, &simdisk_proc_ops, dev);
+
+	return 0;
+
+out_cleanup_disk:
+	put_disk(dev->gd);
+out:
+	return err;
+}
+
+static int __init simdisk_init(void)
+{
+	int i;
+
+	if (register_blkdev(simdisk_major, "simdisk") < 0) {
+		pr_err("SIMDISK: register_blkdev: %d\n", simdisk_major);
+		return -EIO;
+	}
+	pr_info("SIMDISK: major: %d\n", simdisk_major);
+
+	if (n_files > simdisk_count)
+		simdisk_count = n_files;
+	if (simdisk_count > MAX_SIMDISK_COUNT)
+		simdisk_count = MAX_SIMDISK_COUNT;
+
+	sddev = kmalloc_array(simdisk_count, sizeof(*sddev), GFP_KERNEL);
+	if (sddev == NULL)
+		goto out_unregister;
+
+	simdisk_procdir = proc_mkdir("simdisk", 0);
+	if (simdisk_procdir == NULL)
+		goto out_free_unregister;
+
+	for (i = 0; i < simdisk_count; ++i) {
+		if (simdisk_setup(sddev + i, i, simdisk_procdir) == 0) {
+			if (filename[i] != NULL && filename[i][0] != 0 &&
+					(n_files == 0 || i < n_files))
+				simdisk_attach(sddev + i, filename[i]);
+		}
+	}
+
+	return 0;
+
+out_free_unregister:
+	kfree(sddev);
+out_unregister:
+	unregister_blkdev(simdisk_major, "simdisk");
+	return -ENOMEM;
+}
+module_init(simdisk_init);
+
+static void simdisk_teardown(struct simdisk *dev, int which,
+		struct proc_dir_entry *procdir)
+{
+	char tmp[2] = { '0' + which, 0 };
+
+	simdisk_detach(dev);
+	if (dev->gd) {
+		del_gendisk(dev->gd);
+		put_disk(dev->gd);
+	}
+	remove_proc_entry(tmp, procdir);
+}
+
+static void __exit simdisk_exit(void)
+{
+	int i;
+
+	for (i = 0; i < simdisk_count; ++i)
+		simdisk_teardown(sddev + i, i, simdisk_procdir);
+	remove_proc_entry("simdisk", 0);
+	kfree(sddev);
+	unregister_blkdev(simdisk_major, "simdisk");
+}
+module_exit(simdisk_exit);
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(SIMDISK_MAJOR);
+
+MODULE_LICENSE("GPL");