/*
 * mpc8xxx_wdt.c - MPC8xx/MPC83xx/MPC86xx watchdog userspace interface
 *
 * Authors: Dave Updegraff <dave@cray.org>
 *	    Kumar Gala <galak@kernel.crashing.org>
 *		Attribution: from 83xx_wst: Florian Schirmer <jolt@tuxbox.org>
 *				..and from sc520_wdt
 * Copyright (c) 2008  MontaVista Software, Inc.
 *                     Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * Note: it appears that you can only actually ENABLE or DISABLE the thing
 * once after POR. Once enabled, you cannot disable, and vice versa.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <sysdev/fsl_soc.h>

struct mpc8xxx_wdt {
	__be32 res0;
	__be32 swcrr; /* System watchdog control register */
#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */
#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */
#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/
#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */
	__be32 swcnr; /* System watchdog count register */
	u8 res1[2];
	__be16 swsrr; /* System watchdog service register */
	u8 res2[0xF0];
};

struct mpc8xxx_wdt_type {
	int prescaler;
	bool hw_enabled;
};

struct mpc8xxx_wdt_ddata {
	struct mpc8xxx_wdt __iomem *base;
	struct watchdog_device wdd;
	struct timer_list timer;
	spinlock_t lock;
};

static u16 timeout = 0xffff;
module_param(timeout, ushort, 0);
MODULE_PARM_DESC(timeout,
	"Watchdog timeout in ticks. (0<timeout<65536, default=65535)");

static bool reset = 1;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset,
	"Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset");

static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
		 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static void mpc8xxx_wdt_keepalive(struct mpc8xxx_wdt_ddata *ddata)
{
	/* Ping the WDT */
	spin_lock(&ddata->lock);
	out_be16(&ddata->base->swsrr, 0x556c);
	out_be16(&ddata->base->swsrr, 0xaa39);
	spin_unlock(&ddata->lock);
}

static void mpc8xxx_wdt_timer_ping(unsigned long arg)
{
	struct mpc8xxx_wdt_ddata *ddata = (void *)arg;

	mpc8xxx_wdt_keepalive(ddata);
	/* We're pinging it twice faster than needed, just to be sure. */
	mod_timer(&ddata->timer, jiffies + HZ * ddata->wdd.timeout / 2);
}

static int mpc8xxx_wdt_start(struct watchdog_device *w)
{
	struct mpc8xxx_wdt_ddata *ddata =
		container_of(w, struct mpc8xxx_wdt_ddata, wdd);

	u32 tmp = SWCRR_SWEN | SWCRR_SWPR;

	/* Good, fire up the show */
	if (reset)
		tmp |= SWCRR_SWRI;

	tmp |= timeout << 16;

	out_be32(&ddata->base->swcrr, tmp);

	del_timer_sync(&ddata->timer);

	return 0;
}

static int mpc8xxx_wdt_ping(struct watchdog_device *w)
{
	struct mpc8xxx_wdt_ddata *ddata =
		container_of(w, struct mpc8xxx_wdt_ddata, wdd);

	mpc8xxx_wdt_keepalive(ddata);
	return 0;
}

static int mpc8xxx_wdt_stop(struct watchdog_device *w)
{
	struct mpc8xxx_wdt_ddata *ddata =
		container_of(w, struct mpc8xxx_wdt_ddata, wdd);

	mod_timer(&ddata->timer, jiffies);
	return 0;
}

static struct watchdog_info mpc8xxx_wdt_info = {
	.options = WDIOF_KEEPALIVEPING,
	.firmware_version = 1,
	.identity = "MPC8xxx",
};

static struct watchdog_ops mpc8xxx_wdt_ops = {
	.owner = THIS_MODULE,
	.start = mpc8xxx_wdt_start,
	.ping = mpc8xxx_wdt_ping,
	.stop = mpc8xxx_wdt_stop,
};

static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
{
	int ret;
	struct resource *res;
	const struct mpc8xxx_wdt_type *wdt_type;
	struct mpc8xxx_wdt_ddata *ddata;
	u32 freq = fsl_get_sys_freq();
	bool enabled;
	unsigned int timeout_sec;

	wdt_type = of_device_get_match_data(&ofdev->dev);
	if (!wdt_type)
		return -EINVAL;

	if (!freq || freq == -1)
		return -EINVAL;

	ddata = devm_kzalloc(&ofdev->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
	ddata->base = devm_ioremap_resource(&ofdev->dev, res);
	if (IS_ERR(ddata->base))
		return PTR_ERR(ddata->base);

	enabled = in_be32(&ddata->base->swcrr) & SWCRR_SWEN;
	if (!enabled && wdt_type->hw_enabled) {
		pr_info("could not be enabled in software\n");
		return -ENODEV;
	}

	spin_lock_init(&ddata->lock);
	setup_timer(&ddata->timer, mpc8xxx_wdt_timer_ping,
		    (unsigned long)ddata);

	ddata->wdd.info = &mpc8xxx_wdt_info,
	ddata->wdd.ops = &mpc8xxx_wdt_ops,

	/* Calculate the timeout in seconds */
	timeout_sec = (timeout * wdt_type->prescaler) / freq;

	ddata->wdd.timeout = timeout_sec;

	watchdog_set_nowayout(&ddata->wdd, nowayout);

	ret = watchdog_register_device(&ddata->wdd);
	if (ret) {
		pr_err("cannot register watchdog device (err=%d)\n", ret);
		return ret;
	}

	pr_info("WDT driver for MPC8xxx initialized. mode:%s timeout=%d (%d seconds)\n",
		reset ? "reset" : "interrupt", timeout, timeout_sec);

	/*
	 * If the watchdog was previously enabled or we're running on
	 * MPC8xxx, we should ping the wdt from the kernel until the
	 * userspace handles it.
	 */
	if (enabled)
		mod_timer(&ddata->timer, jiffies);

	platform_set_drvdata(ofdev, ddata);
	return 0;
}

static int mpc8xxx_wdt_remove(struct platform_device *ofdev)
{
	struct mpc8xxx_wdt_ddata *ddata = platform_get_drvdata(ofdev);

	pr_crit("Watchdog removed, expect the %s soon!\n",
		reset ? "reset" : "machine check exception");
	del_timer_sync(&ddata->timer);
	watchdog_unregister_device(&ddata->wdd);

	return 0;
}

static const struct of_device_id mpc8xxx_wdt_match[] = {
	{
		.compatible = "mpc83xx_wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x10000,
		},
	},
	{
		.compatible = "fsl,mpc8610-wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x10000,
			.hw_enabled = true,
		},
	},
	{
		.compatible = "fsl,mpc823-wdt",
		.data = &(struct mpc8xxx_wdt_type) {
			.prescaler = 0x800,
			.hw_enabled = true,
		},
	},
	{},
};
MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match);

static struct platform_driver mpc8xxx_wdt_driver = {
	.probe		= mpc8xxx_wdt_probe,
	.remove		= mpc8xxx_wdt_remove,
	.driver = {
		.name = "mpc8xxx_wdt",
		.of_match_table = mpc8xxx_wdt_match,
	},
};

static int __init mpc8xxx_wdt_init(void)
{
	return platform_driver_register(&mpc8xxx_wdt_driver);
}
arch_initcall(mpc8xxx_wdt_init);

static void __exit mpc8xxx_wdt_exit(void)
{
	platform_driver_unregister(&mpc8xxx_wdt_driver);
}
module_exit(mpc8xxx_wdt_exit);

MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
MODULE_DESCRIPTION("Driver for watchdog timer in MPC8xx/MPC83xx/MPC86xx "
		   "uProcessors");
MODULE_LICENSE("GPL");
69a6a51b130ebaaf'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'>Pull networking fixes from David Miller:

 1) GTP fixes from Andreas Schultz (missing genl module alias, clear IP
    DF on transmit).

 2) Netfilter needs to reflect the fwmark when sending resets, from Pau
    Espin Pedrol.

 3) nftable dump OOPS fix from Liping Zhang.

 4) Fix erroneous setting of VIRTIO_NET_HDR_F_DATA_VALID on transmit,
    from Rolf Neugebauer.

 5) Fix build error of ipt_CLUSTERIP when procfs is disabled, from Arnd
    Bergmann.

 6) Fix regression in handling of NETIF_F_SG in harmonize_features(),
    from Eric Dumazet.

 7) Fix RTNL deadlock wrt. lwtunnel module loading, from David Ahern.

 8) tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'tools/perf/util/annotate.h')</div><table summary='diffstat' class='diffstat'>