cpwatchdog: Move to drivers/watchdog/cpwd.c

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 0 insertions, 696 deletions

diff --git a/drivers/sbus/char/Makefile b/drivers/sbus/char/Makefile
index b29c186b695..d83212ec541 100644
--- a/drivers/sbus/char/Makefile
+++ b/drivers/sbus/char/Makefile
@@ -11,7 +11,6 @@ bbc-objs := bbc_i2c.o bbc_envctrl.o
 
 obj-$(CONFIG_ENVCTRL)			+= envctrl.o
 obj-$(CONFIG_DISPLAY7SEG)		+= display7seg.o
-obj-$(CONFIG_WATCHDOG_CP1XXX)		+= cpwatchdog.o
 obj-$(CONFIG_OBP_FLASH)			+= flash.o
 obj-$(CONFIG_SUN_OPENPROMIO)		+= openprom.o
 obj-$(CONFIG_SUN_MOSTEK_RTC)		+= rtc.o
diff --git a/drivers/sbus/char/cpwatchdog.c b/drivers/sbus/char/cpwatchdog.c
deleted file mode 100644
index c88df62e705..00000000000
--- a/drivers/sbus/char/cpwatchdog.c
+++ /dev/null
@@ -1,695 +0,0 @@
-/* cpwatchdog.c - driver implementation for hardware watchdog
- * timers found on Sun Microsystems CP1400 and CP1500 boards.
- *
- * This device supports both the generic Linux watchdog 
- * interface and Solaris-compatible ioctls as best it is
- * able.
- *
- * NOTE: 	CP1400 systems appear to have a defective intr_mask
- * 			register on the PLD, preventing the disabling of
- * 			timer interrupts.  We use a timer to periodically 
- * 			reset 'stopped' watchdogs on affected platforms.
- *
- * Copyright (c) 2000 Eric Brower (ebrower@usa.net)
- * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/errno.h>
-#include <linux/major.h>
-#include <linux/init.h>
-#include <linux/miscdevice.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/timer.h>
-#include <linux/smp_lock.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-
-#include <asm/watchdog.h>
-
-#define DRIVER_NAME	"cpwd"
-#define PFX		DRIVER_NAME ": "
-
-#define WD_OBPNAME	"watchdog"
-#define WD_BADMODEL	"SUNW,501-5336"
-#define WD_BTIMEOUT	(jiffies + (HZ * 1000))
-#define WD_BLIMIT	0xFFFF
-
-#define WD0_MINOR	212
-#define WD1_MINOR	213	
-#define WD2_MINOR	214	
-
-/* Internal driver definitions.  */
-#define WD0_ID			0
-#define WD1_ID			1
-#define WD2_ID			2
-#define WD_NUMDEVS		3
-
-#define WD_INTR_OFF		0
-#define WD_INTR_ON		1
-
-#define WD_STAT_INIT	0x01	/* Watchdog timer is initialized	*/
-#define WD_STAT_BSTOP	0x02	/* Watchdog timer is brokenstopped	*/
-#define WD_STAT_SVCD	0x04	/* Watchdog interrupt occurred		*/
-
-/* Register value definitions
- */
-#define WD0_INTR_MASK	0x01	/* Watchdog device interrupt masks	*/
-#define WD1_INTR_MASK	0x02
-#define WD2_INTR_MASK	0x04
-
-#define WD_S_RUNNING	0x01	/* Watchdog device status running	*/
-#define WD_S_EXPIRED	0x02	/* Watchdog device status expired	*/
-
-struct cpwd {
-	void __iomem	*regs;
-	spinlock_t	lock;
-
-	unsigned int	irq;
-
-	unsigned long	timeout;
-	bool		enabled;
-	bool		reboot;
-	bool		broken;
-	bool		initialized;
-
-	struct {
-		struct miscdevice	misc;
-		void __iomem		*regs;
-		u8			intr_mask;
-		u8			runstatus;
-		u16			timeout;
-	} devs[WD_NUMDEVS];
-};
-
-static struct cpwd *cpwd_device;
-
-/* Sun uses Altera PLD EPF8820ATC144-4 
- * providing three hardware watchdogs:
- *
- * 	1) RIC - sends an interrupt when triggered
- * 	2) XIR - asserts XIR_B_RESET when triggered, resets CPU
- * 	3) POR - asserts POR_B_RESET when triggered, resets CPU, backplane, board
- *
- *** Timer register block definition (struct wd_timer_regblk)
- *
- * dcntr and limit registers (halfword access):      
- * -------------------
- * | 15 | ...| 1 | 0 |
- * -------------------
- * |-  counter val  -|
- * -------------------
- * dcntr - 	Current 16-bit downcounter value.
- * 			When downcounter reaches '0' watchdog expires.
- * 			Reading this register resets downcounter with 'limit' value.
- * limit - 	16-bit countdown value in 1/10th second increments.
- * 			Writing this register begins countdown with input value.
- * 			Reading from this register does not affect counter.
- * NOTES:	After watchdog reset, dcntr and limit contain '1'
- *
- * status register (byte access):
- * ---------------------------
- * | 7 | ... | 2 |  1  |  0  |
- * --------------+------------
- * |-   UNUSED  -| EXP | RUN |
- * ---------------------------
- * status-	Bit 0 - Watchdog is running
- * 			Bit 1 - Watchdog has expired
- *
- *** PLD register block definition (struct wd_pld_regblk)
- *
- * intr_mask register (byte access):
- * ---------------------------------
- * | 7 | ... | 3 |  2  |  1  |  0  |
- * +-------------+------------------
- * |-   UNUSED  -| WD3 | WD2 | WD1 |
- * ---------------------------------
- * WD3 -  1 == Interrupt disabled for watchdog 3
- * WD2 -  1 == Interrupt disabled for watchdog 2
- * WD1 -  1 == Interrupt disabled for watchdog 1
- *
- * pld_status register (byte access):
- * UNKNOWN, MAGICAL MYSTERY REGISTER
- *
- */
-#define WD_TIMER_REGSZ	16
-#define WD0_OFF		0
-#define WD1_OFF		(WD_TIMER_REGSZ * 1)
-#define WD2_OFF		(WD_TIMER_REGSZ * 2)
-#define PLD_OFF		(WD_TIMER_REGSZ * 3)
-
-#define WD_DCNTR	0x00
-#define WD_LIMIT	0x04
-#define WD_STATUS	0x08
-
-#define PLD_IMASK	(PLD_OFF + 0x00)
-#define PLD_STATUS	(PLD_OFF + 0x04)
-
-static struct timer_list cpwd_timer;
-
-static int wd0_timeout = 0;
-static int wd1_timeout = 0;
-static int wd2_timeout = 0;
-
-module_param	(wd0_timeout, int, 0);
-MODULE_PARM_DESC(wd0_timeout, "Default watchdog0 timeout in 1/10secs");
-module_param 	(wd1_timeout, int, 0);
-MODULE_PARM_DESC(wd1_timeout, "Default watchdog1 timeout in 1/10secs");
-module_param 	(wd2_timeout, int, 0);
-MODULE_PARM_DESC(wd2_timeout, "Default watchdog2 timeout in 1/10secs");
-
-MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
-MODULE_DESCRIPTION("Hardware watchdog driver for Sun Microsystems CP1400/1500");
-MODULE_LICENSE("GPL");
-MODULE_SUPPORTED_DEVICE("watchdog");
-
-static void cpwd_writew(u16 val, void __iomem *addr)
-{
-	writew(cpu_to_le16(val), addr);
-}
-static u16 cpwd_readw(void __iomem *addr)
-{
-	u16 val = readw(addr);
-
-	return le16_to_cpu(val);
-}
-
-static void cpwd_writeb(u8 val, void __iomem *addr)
-{
-	writeb(val, addr);
-}
-
-static u8 cpwd_readb(void __iomem *addr)
-{
-	return readb(addr);
-}
-
-/* Enable or disable watchdog interrupts
- * Because of the CP1400 defect this should only be
- * called during initialzation or by wd_[start|stop]timer()
- *
- * index 	- sub-device index, or -1 for 'all'
- * enable	- non-zero to enable interrupts, zero to disable
- */
-static void cpwd_toggleintr(struct cpwd *p, int index, int enable)
-{
-	unsigned char curregs = cpwd_readb(p->regs + PLD_IMASK);
-	unsigned char setregs = 
-		(index == -1) ? 
-		(WD0_INTR_MASK | WD1_INTR_MASK | WD2_INTR_MASK) : 
-		(p->devs[index].intr_mask);
-
-	if (enable == WD_INTR_ON)
-		curregs &= ~setregs;
-	else
-		curregs |= setregs;
-
-	cpwd_writeb(curregs, p->regs + PLD_IMASK);
-}
-
-/* Restarts timer with maximum limit value and
- * does not unset 'brokenstop' value.
- */
-static void cpwd_resetbrokentimer(struct cpwd *p, int index)
-{
-	cpwd_toggleintr(p, index, WD_INTR_ON);
-	cpwd_writew(WD_BLIMIT, p->devs[index].regs + WD_LIMIT);
-}
-
-/* Timer method called to reset stopped watchdogs--
- * because of the PLD bug on CP1400, we cannot mask
- * interrupts within the PLD so me must continually
- * reset the timers ad infinitum.
- */
-static void cpwd_brokentimer(unsigned long data)
-{
-	struct cpwd *p = (struct cpwd *) data;
-	int id, tripped = 0;
-
-	/* kill a running timer instance, in case we
-	 * were called directly instead of by kernel timer
-	 */
-	if (timer_pending(&cpwd_timer))
-		del_timer(&cpwd_timer);
-
-	for (id = 0; id < WD_NUMDEVS; id++) {
-		if (p->devs[id].runstatus & WD_STAT_BSTOP) {
-			++tripped;
-			cpwd_resetbrokentimer(p, id);
-		}
-	}
-
-	if (tripped) {
-		/* there is at least one timer brokenstopped-- reschedule */
-		cpwd_timer.expires = WD_BTIMEOUT;
-		add_timer(&cpwd_timer);
-	}
-}
-
-/* Reset countdown timer with 'limit' value and continue countdown.
- * This will not start a stopped timer.
- */
-static void cpwd_pingtimer(struct cpwd *p, int index)
-{
-	if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING)
-		cpwd_readw(p->devs[index].regs + WD_DCNTR);
-}
-
-/* Stop a running watchdog timer-- the timer actually keeps
- * running, but the interrupt is masked so that no action is
- * taken upon expiration.
- */
-static void cpwd_stoptimer(struct cpwd *p, int index)
-{
-	if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING) {
-		cpwd_toggleintr(p, index, WD_INTR_OFF);
-
-		if (p->broken) {
-			p->devs[index].runstatus |= WD_STAT_BSTOP;
-			cpwd_brokentimer((unsigned long) p);
-		}
-	}
-}
-
-/* Start a watchdog timer with the specified limit value
- * If the watchdog is running, it will be restarted with
- * the provided limit value.
- *
- * This function will enable interrupts on the specified
- * watchdog.
- */
-static void cpwd_starttimer(struct cpwd *p, int index)
-{
-	if (p->broken)
-		p->devs[index].runstatus &= ~WD_STAT_BSTOP;
-
-	p->devs[index].runstatus &= ~WD_STAT_SVCD;
-
-	cpwd_writew(p->devs[index].timeout, p->devs[index].regs + WD_LIMIT);
-	cpwd_toggleintr(p, index, WD_INTR_ON);
-}
-
-static int cpwd_getstatus(struct cpwd *p, int index)
-{
-	unsigned char stat = cpwd_readb(p->devs[index].regs + WD_STATUS);
-	unsigned char intr = cpwd_readb(p->devs[index].regs + PLD_IMASK);
-	unsigned char ret  = WD_STOPPED;
-
-	/* determine STOPPED */
-	if (!stat) 
-		return ret;
-
-	/* determine EXPIRED vs FREERUN vs RUNNING */
-	else if (WD_S_EXPIRED & stat) {
-		ret = WD_EXPIRED;
-	} else if(WD_S_RUNNING & stat) {
-		if (intr & p->devs[index].intr_mask) {
-			ret = WD_FREERUN;
-		} else {
-			/* Fudge WD_EXPIRED status for defective CP1400--
-			 * IF timer is running 
-			 * 	AND brokenstop is set 
-			 * 	AND an interrupt has been serviced
-			 * we are WD_EXPIRED.
-			 *
-			 * IF timer is running 
-			 * 	AND brokenstop is set 
-			 * 	AND no interrupt has been serviced
-			 * we are WD_FREERUN.
-			 */
-			if (p->broken &&
-			    (p->devs[index].runstatus & WD_STAT_BSTOP)) {
-				if (p->devs[index].runstatus & WD_STAT_SVCD) {
-					ret = WD_EXPIRED;
-				} else {
-					/* we could as well pretend we are expired */
-					ret = WD_FREERUN;
-				}
-			} else {
-				ret = WD_RUNNING;
-			}
-		}
-	}
-
-	/* determine SERVICED */
-	if (p->devs[index].runstatus & WD_STAT_SVCD)
-		ret |= WD_SERVICED;
-
-	return(ret);
-}
-
-static irqreturn_t cpwd_interrupt(int irq, void *dev_id)
-{
-	struct cpwd *p = dev_id;
-
-	/* Only WD0 will interrupt-- others are NMI and we won't
-	 * see them here....
-	 */
-	spin_lock_irq(&p->lock);
-
-	cpwd_stoptimer(p, WD0_ID);
-	p->devs[WD0_ID].runstatus |=  WD_STAT_SVCD;
-
-	spin_unlock_irq(&p->lock);
-
-	return IRQ_HANDLED;
-}
-
-static int cpwd_open(struct inode *inode, struct file *f)
-{
-	struct cpwd *p = cpwd_device;
-
-	lock_kernel();
-	switch(iminor(inode)) {
-		case WD0_MINOR:
-		case WD1_MINOR:
-		case WD2_MINOR:
-			break;
-
-		default:
-			unlock_kernel();
-			return -ENODEV;
-	}
-
-	/* Register IRQ on first open of device */
-	if (!p->initialized) {
-		if (request_irq(p->irq, &cpwd_interrupt, 
-				IRQF_SHARED, DRIVER_NAME, p)) {
-			printk(KERN_ERR PFX "Cannot register IRQ %d\n", 
-				p->irq);
-			unlock_kernel();
-			return -EBUSY;
-		}
-		p->initialized = true;
-	}
-
-	unlock_kernel();
-
-	return nonseekable_open(inode, f);
-}
-
-static int cpwd_release(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static int cpwd_ioctl(struct inode *inode, struct file *file, 
-		      unsigned int cmd, unsigned long arg)
-{
-	static struct watchdog_info info = {
-		.options		= WDIOF_SETTIMEOUT,
-		.firmware_version	= 1,
-		.identity		= DRIVER_NAME,
-	};
-	void __user *argp = (void __user *)arg;
-	int index = iminor(inode) - WD0_MINOR;
-	struct cpwd *p = cpwd_device;
-	int setopt = 0;
-
-	switch (cmd) {
-	/* Generic Linux IOCTLs */
-	case WDIOC_GETSUPPORT:
-		if (copy_to_user(argp, &info, sizeof(struct watchdog_info)))
-			return -EFAULT;
-		break;
-
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		if (put_user(0, (int __user *)argp))
-			return -EFAULT;
-		break;
-
-	case WDIOC_KEEPALIVE:
-		cpwd_pingtimer(p, index);
-		break;
-
-	case WDIOC_SETOPTIONS:
-		if (copy_from_user(&setopt, argp, sizeof(unsigned int)))
-			return -EFAULT;
-
-		if (setopt & WDIOS_DISABLECARD) {
-			if (p->enabled)
-				return -EINVAL;
-			cpwd_stoptimer(p, index);
-		} else if (setopt & WDIOS_ENABLECARD) {
-			cpwd_starttimer(p, index);
-		} else {
-			return -EINVAL;
-		}	
-		break;
-
-	/* Solaris-compatible IOCTLs */
-	case WIOCGSTAT:
-		setopt = cpwd_getstatus(p, index);
-		if (copy_to_user(argp, &setopt, sizeof(unsigned int)))
-			return -EFAULT;
-		break;
-
-	case WIOCSTART:
-		cpwd_starttimer(p, index);
-		break;
-
-	case WIOCSTOP:
-		if (p->enabled)
-			return(-EINVAL);
-
-		cpwd_stoptimer(p, index);
-		break;
-
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
-			      unsigned long arg)
-{
-	int rval = -ENOIOCTLCMD;
-
-	switch (cmd) {
-	/* solaris ioctls are specific to this driver */
-	case WIOCSTART:
-	case WIOCSTOP:
-	case WIOCGSTAT:
-		lock_kernel();
-		rval = cpwd_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
-		unlock_kernel();
-		break;
-
-	/* everything else is handled by the generic compat layer */
-	default:
-		break;
-	}
-
-	return rval;
-}
-
-static ssize_t cpwd_write(struct file *file, const char __user *buf, 
-			  size_t count, loff_t *ppos)
-{
-	struct inode *inode = file->f_path.dentry->d_inode;
-	struct cpwd *p = cpwd_device;
-	int index = iminor(inode);
-
-	if (count) {
-		cpwd_pingtimer(p, index);
-		return 1;
-	}
-
-	return 0;
-}
-
-static ssize_t cpwd_read(struct file * file, char __user *buffer,
-			 size_t count, loff_t *ppos)
-{
-	return -EINVAL;
-}
-
-static const struct file_operations cpwd_fops = {
-	.owner =	THIS_MODULE,
-	.ioctl =	cpwd_ioctl,
-	.compat_ioctl =	cpwd_compat_ioctl,
-	.open =		cpwd_open,
-	.write =	cpwd_write,
-	.read =		cpwd_read,
-	.release =	cpwd_release,
-};
-
-static int __devinit cpwd_probe(struct of_device *op,
-				const struct of_device_id *match)
-{
-	struct device_node *options;
-	const char *str_prop;
-	const void *prop_val;
-	int i, err = -EINVAL;
-	struct cpwd *p;
-
-	if (cpwd_device)
-		return -EINVAL;
-
-	p = kzalloc(sizeof(*p), GFP_KERNEL);
-	err = -ENOMEM;
-	if (!p) {
-		printk(KERN_ERR PFX "Unable to allocate struct cpwd.\n");
-		goto out;
-	}
-
-	p->irq = op->irqs[0];
-
-	spin_lock_init(&p->lock);
-
-	p->regs = of_ioremap(&op->resource[0], 0,
-			     4 * WD_TIMER_REGSZ, DRIVER_NAME);
-	if (!p->regs) {
-		printk(KERN_ERR PFX "Unable to map registers.\n");
-		goto out_free;
-	}
-
-	options = of_find_node_by_path("/options");
-	err = -ENODEV;
-	if (!options) {
-		printk(KERN_ERR PFX "Unable to find /options node.\n");
-		goto out_iounmap;
-	}
-
-	prop_val = of_get_property(options, "watchdog-enable?", NULL);
-	p->enabled = (prop_val ? true : false);
-
-	prop_val = of_get_property(options, "watchdog-reboot?", NULL);
-	p->reboot = (prop_val ? true : false);
-
-	str_prop = of_get_property(options, "watchdog-timeout", NULL);
-	if (str_prop)
-		p->timeout = simple_strtoul(str_prop, NULL, 10);
-
-	/* CP1400s seem to have broken PLD implementations-- the
-	 * interrupt_mask register cannot be written, so no timer
-	 * interrupts can be masked within the PLD.
-	 */
-	str_prop = of_get_property(op->node, "model", NULL);
-	p->broken = (str_prop && !strcmp(str_prop, WD_BADMODEL));
-
-	if (!p->enabled)
-		cpwd_toggleintr(p, -1, WD_INTR_OFF);
-
-	for (i = 0; i < WD_NUMDEVS; i++) {
-		static const char *cpwd_names[] = { "RIC", "XIR", "POR" };
-		static int *parms[] = { &wd0_timeout,
-					&wd1_timeout,
-					&wd2_timeout };
-		struct miscdevice *mp = &p->devs[i].misc;
-
-		mp->minor = WD0_MINOR + i;
-		mp->name = cpwd_names[i];
-		mp->fops = &cpwd_fops;
-
-		p->devs[i].regs = p->regs + (i * WD_TIMER_REGSZ);
-		p->devs[i].intr_mask = (WD0_INTR_MASK << i);
-		p->devs[i].runstatus &= ~WD_STAT_BSTOP;
-		p->devs[i].runstatus |= WD_STAT_INIT;
-		p->devs[i].timeout = p->timeout;
-		if (*parms[i])
-			p->devs[i].timeout = *parms[i];
-
-		err = misc_register(&p->devs[i].misc);
-		if (err) {
-			printk(KERN_ERR "Could not register misc device for "
-			       "dev %d\n", i);
-			goto out_unregister;
-		}
-	}
-
-	if (p->broken) {
-		init_timer(&cpwd_timer);
-		cpwd_timer.function 	= cpwd_brokentimer;
-		cpwd_timer.data		= (unsigned long) p;
-		cpwd_timer.expires	= WD_BTIMEOUT;
-
-		printk(KERN_INFO PFX "PLD defect workaround enabled for "
-		       "model " WD_BADMODEL ".\n");
-	}
-
-	dev_set_drvdata(&op->dev, p);
-	cpwd_device = p;
-	err = 0;
-
-out:
-	return err;
-
-out_unregister:
-	for (i--; i >= 0; i--)
-		misc_deregister(&p->devs[i].misc);
-
-out_iounmap:
-	of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
-
-out_free:
-	kfree(p);
-	goto out;
-}
-
-static int __devexit cpwd_remove(struct of_device *op)
-{
-	struct cpwd *p = dev_get_drvdata(&op->dev);
-	int i;
-
-	for (i = 0; i < 4; i++) {
-		misc_deregister(&p->devs[i].misc);
-
-		if (!p->enabled) {
-			cpwd_stoptimer(p, i);
-			if (p->devs[i].runstatus & WD_STAT_BSTOP)
-				cpwd_resetbrokentimer(p, i);
-		}
-	}
-
-	if (p->broken)
-		del_timer_sync(&cpwd_timer);
-
-	if (p->initialized)
-		free_irq(p->irq, p);
-
-	of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
-	kfree(p);
-
-	cpwd_device = NULL;
-
-	return 0;
-}
-
-static struct of_device_id cpwd_match[] = {
-	{
-		.name = "watchdog",
-	},
-	{},
-};
-MODULE_DEVICE_TABLE(of, cpwd_match);
-
-static struct of_platform_driver cpwd_driver = {
-	.name		= DRIVER_NAME,
-	.match_table	= cpwd_match,
-	.probe		= cpwd_probe,
-	.remove		= __devexit_p(cpwd_remove),
-};
-
-static int __init cpwd_init(void)
-{
-	return of_register_driver(&cpwd_driver, &of_bus_type);
-}
-
-static void __exit cpwd_exit(void)
-{
-	of_unregister_driver(&cpwd_driver);
-}
-
-module_init(cpwd_init);
-module_exit(cpwd_exit);