[deliverable/linux.git] / drivers / s390 / cio / device_ops.c

/*
 *  drivers/s390/cio/device_ops.c
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 *               Cornelia Huck (cornelia.huck@de.ibm.com)
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/delay.h>

#include <asm/ccwdev.h>
#include <asm/idals.h>

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc.h"
#include "device.h"

int
ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
{
       /*
	* The flag usage is mutal exclusive ...
	*/
	if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
	    (flags & CCWDEV_REPORT_ALL))
		return -EINVAL;
	cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
	cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
	cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
	cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
	return 0;
}

int
ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
{
	struct subchannel *sch;
	int ret;

	if (!cdev)
		return -ENODEV;
	if (cdev->private->state == DEV_STATE_NOT_OPER)
		return -ENODEV;
	if (cdev->private->state != DEV_STATE_ONLINE &&
	    cdev->private->state != DEV_STATE_WAIT4IO &&
	    cdev->private->state != DEV_STATE_W4SENSE)
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);
	if (!sch)
		return -ENODEV;
	ret = cio_clear(sch);
	if (ret == 0)
		cdev->private->intparm = intparm;
	return ret;
}

int
ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
		     unsigned long intparm, __u8 lpm, __u8 key,
		     unsigned long flags)
{
	struct subchannel *sch;
	int ret;

	if (!cdev)
		return -ENODEV;
	sch = to_subchannel(cdev->dev.parent);
	if (!sch)
		return -ENODEV;
	if (cdev->private->state == DEV_STATE_NOT_OPER)
		return -ENODEV;
	if (cdev->private->state == DEV_STATE_VERIFY ||
	    cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
		/* Remember to fake irb when finished. */
		if (!cdev->private->flags.fake_irb) {
			cdev->private->flags.fake_irb = 1;
			cdev->private->intparm = intparm;
			return 0;
		} else
			/* There's already a fake I/O around. */
			return -EBUSY;
	}
	if (cdev->private->state != DEV_STATE_ONLINE ||
	    ((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
	     !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
	    cdev->private->flags.doverify)
		return -EBUSY;
	ret = cio_set_options (sch, flags);
	if (ret)
		return ret;
	ret = cio_start_key (sch, cpa, lpm, key);
	if (ret == 0)
		cdev->private->intparm = intparm;
	return ret;
}


int
ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
			     unsigned long intparm, __u8 lpm, __u8 key,
			     unsigned long flags, int expires)
{
	int ret;

	if (!cdev)
		return -ENODEV;
	ccw_device_set_timeout(cdev, expires);
	ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
	if (ret != 0)
		ccw_device_set_timeout(cdev, 0);
	return ret;
}

int
ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
		 unsigned long intparm, __u8 lpm, unsigned long flags)
{
	return ccw_device_start_key(cdev, cpa, intparm, lpm,
				    PAGE_DEFAULT_KEY, flags);
}

int
ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
			 unsigned long intparm, __u8 lpm, unsigned long flags,
			 int expires)
{
	return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
					    PAGE_DEFAULT_KEY, flags,
					    expires);
}


int
ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
{
	struct subchannel *sch;
	int ret;

	if (!cdev)
		return -ENODEV;
	if (cdev->private->state == DEV_STATE_NOT_OPER)
		return -ENODEV;
	if (cdev->private->state != DEV_STATE_ONLINE &&
	    cdev->private->state != DEV_STATE_WAIT4IO &&
	    cdev->private->state != DEV_STATE_W4SENSE)
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);
	if (!sch)
		return -ENODEV;
	ret = cio_halt(sch);
	if (ret == 0)
		cdev->private->intparm = intparm;
	return ret;
}

int
ccw_device_resume(struct ccw_device *cdev)
{
	struct subchannel *sch;

	if (!cdev)
		return -ENODEV;
	sch = to_subchannel(cdev->dev.parent);
	if (!sch)
		return -ENODEV;
	if (cdev->private->state == DEV_STATE_NOT_OPER)
		return -ENODEV;
	if (cdev->private->state != DEV_STATE_ONLINE ||
	    !(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
		return -EINVAL;
	return cio_resume(sch);
}

/*
 * Pass interrupt to device driver.
 */
int
ccw_device_call_handler(struct ccw_device *cdev)
{
	struct subchannel *sch;
	unsigned int stctl;
	int ending_status;

	sch = to_subchannel(cdev->dev.parent);

	/*
	 * we allow for the device action handler if .
	 *  - we received ending status
	 *  - the action handler requested to see all interrupts
	 *  - we received an intermediate status
	 *  - fast notification was requested (primary status)
	 *  - unsolicited interrupts
	 */
	stctl = cdev->private->irb.scsw.stctl;
	ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
		(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
		(stctl == SCSW_STCTL_STATUS_PEND);
	if (!ending_status &&
	    !cdev->private->options.repall &&
	    !(stctl & SCSW_STCTL_INTER_STATUS) &&
	    !(cdev->private->options.fast &&
	      (stctl & SCSW_STCTL_PRIM_STATUS)))
		return 0;

	/*
	 * Now we are ready to call the device driver interrupt handler.
	 */
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      &cdev->private->irb);

	/*
	 * Clear the old and now useless interrupt response block.
	 */
	memset(&cdev->private->irb, 0, sizeof(struct irb));

	return 1;
}

/*
 * Search for CIW command in extended sense data.
 */
struct ciw *
ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
{
	int ciw_cnt;

	if (cdev->private->flags.esid == 0)
		return NULL;
	for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
		if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
			return cdev->private->senseid.ciw + ciw_cnt;
	return NULL;
}

__u8
ccw_device_get_path_mask(struct ccw_device *cdev)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	if (!sch)
		return 0;
	else
		return sch->vpm;
}

static void
ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
{
	if (!ip)
		/* unsolicited interrupt */
		return;

	/* Abuse intparm for error reporting. */
	if (IS_ERR(irb))
		cdev->private->intparm = -EIO;
	else if (irb->scsw.cc == 1)
		/* Retry for deferred condition code. */
		cdev->private->intparm = -EAGAIN;
	else if ((irb->scsw.dstat !=
		  (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
		 (irb->scsw.cstat != 0)) {
		/*
		 * We didn't get channel end / device end. Check if path
		 * verification has been started; we can retry after it has
		 * finished. We also retry unit checks except for command reject
		 * or intervention required. Also check for long busy
		 * conditions.
		 */
		 if (cdev->private->flags.doverify ||
			 cdev->private->state == DEV_STATE_VERIFY)
			 cdev->private->intparm = -EAGAIN;
		 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
		     !(irb->ecw[0] &
		       (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
			 cdev->private->intparm = -EAGAIN;
		else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
			 (irb->scsw.dstat & DEV_STAT_DEV_END) &&
			 (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
			cdev->private->intparm = -EAGAIN;
		 else
			 cdev->private->intparm = -EIO;
			 
	} else
		cdev->private->intparm = 0;
	wake_up(&cdev->private->wait_q);
}

static inline int
__ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
{
	int ret;
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	do {
		ret = cio_start (sch, ccw, lpm);
		if ((ret == -EBUSY) || (ret == -EACCES)) {
			/* Try again later. */
			spin_unlock_irq(&sch->lock);
			msleep(10);
			spin_lock_irq(&sch->lock);
			continue;
		}
		if (ret != 0)
			/* Non-retryable error. */
			break;
		/* Wait for end of request. */
		cdev->private->intparm = magic;
		spin_unlock_irq(&sch->lock);
		wait_event(cdev->private->wait_q,
			   (cdev->private->intparm == -EIO) ||
			   (cdev->private->intparm == -EAGAIN) ||
			   (cdev->private->intparm == 0));
		spin_lock_irq(&sch->lock);
		/* Check at least for channel end / device end */
		if (cdev->private->intparm == -EIO) {
			/* Non-retryable error. */
			ret = -EIO;
			break;
		}
		if (cdev->private->intparm == 0)
			/* Success. */
			break;
		/* Try again later. */
		spin_unlock_irq(&sch->lock);
		msleep(10);
		spin_lock_irq(&sch->lock);
	} while (1);

	return ret;
}

/**
 * read_dev_chars() - read device characteristics
 * @param cdev   target ccw device
 * @param buffer pointer to buffer for rdc data
 * @param length size of rdc data
 * @returns 0 for success, negative error value on failure
 *
 * Context:
 *   called for online device, lock not held
 **/
int
read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
{
	void (*handler)(struct ccw_device *, unsigned long, struct irb *);
	struct subchannel *sch;
	int ret;
	struct ccw1 *rdc_ccw;

	if (!cdev)
		return -ENODEV;
	if (!buffer || !length)
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);

	CIO_TRACE_EVENT (4, "rddevch");
	CIO_TRACE_EVENT (4, sch->dev.bus_id);

	rdc_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
	if (!rdc_ccw)
		return -ENOMEM;
	rdc_ccw->cmd_code = CCW_CMD_RDC;
	rdc_ccw->count = length;
	rdc_ccw->flags = CCW_FLAG_SLI;
	ret = set_normalized_cda (rdc_ccw, (*buffer));
	if (ret != 0) {
		kfree(rdc_ccw);
		return ret;
	}

	spin_lock_irq(&sch->lock);
	/* Save interrupt handler. */
	handler = cdev->handler;
	/* Temporarily install own handler. */
	cdev->handler = ccw_device_wake_up;
	if (cdev->private->state != DEV_STATE_ONLINE)
		ret = -ENODEV;
	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
		  !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
		 cdev->private->flags.doverify)
		ret = -EBUSY;
	else
		/* 0x00D9C4C3 == ebcdic "RDC" */
		ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);

	/* Restore interrupt handler. */
	cdev->handler = handler;
	spin_unlock_irq(&sch->lock);

	clear_normalized_cda (rdc_ccw);
	kfree(rdc_ccw);

	return ret;
}

/*
 *  Read Configuration data using path mask
 */
int
read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm)
{
	void (*handler)(struct ccw_device *, unsigned long, struct irb *);
	struct subchannel *sch;
	struct ciw *ciw;
	char *rcd_buf;
	int ret;
	struct ccw1 *rcd_ccw;

	if (!cdev)
		return -ENODEV;
	if (!buffer || !length)
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);

	CIO_TRACE_EVENT (4, "rdconf");
	CIO_TRACE_EVENT (4, sch->dev.bus_id);

	/*
	 * scan for RCD command in extended SenseID data
	 */
	ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
	if (!ciw || ciw->cmd == 0)
		return -EOPNOTSUPP;

	rcd_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
	if (!rcd_ccw)
		return -ENOMEM;
	rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 	if (!rcd_buf) {
		kfree(rcd_ccw);
		return -ENOMEM;
	}
	rcd_ccw->cmd_code = ciw->cmd;
	rcd_ccw->cda = (__u32) __pa (rcd_buf);
	rcd_ccw->count = ciw->count;
	rcd_ccw->flags = CCW_FLAG_SLI;

	spin_lock_irq(&sch->lock);
	/* Save interrupt handler. */
	handler = cdev->handler;
	/* Temporarily install own handler. */
	cdev->handler = ccw_device_wake_up;
	if (cdev->private->state != DEV_STATE_ONLINE)
		ret = -ENODEV;
	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
		  !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
		 cdev->private->flags.doverify)
		ret = -EBUSY;
	else
		/* 0x00D9C3C4 == ebcdic "RCD" */
		ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);

	/* Restore interrupt handler. */
	cdev->handler = handler;
	spin_unlock_irq(&sch->lock);

 	/*
 	 * on success we update the user input parms
 	 */
 	if (ret) {
 		kfree (rcd_buf);
 		*buffer = NULL;
 		*length = 0;
 	} else {
		*length = ciw->count;
		*buffer = rcd_buf;
	}
	kfree(rcd_ccw);

	return ret;
}

/*
 *  Read Configuration data
 */
int
read_conf_data (struct ccw_device *cdev, void **buffer, int *length)
{
	return read_conf_data_lpm (cdev, buffer, length, 0);
}

/*
 * Try to break the lock on a boxed device.
 */
int
ccw_device_stlck(struct ccw_device *cdev)
{
	void *buf, *buf2;
	unsigned long flags;
	struct subchannel *sch;
	int ret;

	if (!cdev)
		return -ENODEV;

	if (cdev->drv && !cdev->private->options.force)
		return -EINVAL;

	sch = to_subchannel(cdev->dev.parent);
	
	CIO_TRACE_EVENT(2, "stl lock");
	CIO_TRACE_EVENT(2, cdev->dev.bus_id);

	buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
	if (!buf2) {
		kfree(buf);
		return -ENOMEM;
	}
	spin_lock_irqsave(&sch->lock, flags);
	ret = cio_enable_subchannel(sch, 3);
	if (ret)
		goto out_unlock;
	/*
	 * Setup ccw. We chain an unconditional reserve and a release so we
	 * only break the lock.
	 */
	cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
	cdev->private->iccws[0].cda = (__u32) __pa(buf);
	cdev->private->iccws[0].count = 32;
	cdev->private->iccws[0].flags = CCW_FLAG_CC;
	cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
	cdev->private->iccws[1].cda = (__u32) __pa(buf2);
	cdev->private->iccws[1].count = 32;
	cdev->private->iccws[1].flags = 0;
	ret = cio_start(sch, cdev->private->iccws, 0);
	if (ret) {
		cio_disable_subchannel(sch); //FIXME: return code?
		goto out_unlock;
	}
	cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
	spin_unlock_irqrestore(&sch->lock, flags);
	wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
	spin_lock_irqsave(&sch->lock, flags);
	cio_disable_subchannel(sch); //FIXME: return code?
	if ((cdev->private->irb.scsw.dstat !=
	     (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
	    (cdev->private->irb.scsw.cstat != 0))
		ret = -EIO;
	/* Clear irb. */
	memset(&cdev->private->irb, 0, sizeof(struct irb));
out_unlock:
	kfree(buf);
	kfree(buf2);
	spin_unlock_irqrestore(&sch->lock, flags);
	return ret;
}

void *
ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	return chsc_get_chp_desc(sch, chp_no);
}

// FIXME: these have to go:

int
_ccw_device_get_subchannel_number(struct ccw_device *cdev)
{
	return cdev->private->sch_no;
}

int
_ccw_device_get_device_number(struct ccw_device *cdev)
{
	return cdev->private->devno;
}


MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_options);
EXPORT_SYMBOL(ccw_device_clear);
EXPORT_SYMBOL(ccw_device_halt);
EXPORT_SYMBOL(ccw_device_resume);
EXPORT_SYMBOL(ccw_device_start_timeout);
EXPORT_SYMBOL(ccw_device_start);
EXPORT_SYMBOL(ccw_device_start_timeout_key);
EXPORT_SYMBOL(ccw_device_start_key);
EXPORT_SYMBOL(ccw_device_get_ciw);
EXPORT_SYMBOL(ccw_device_get_path_mask);
EXPORT_SYMBOL(read_conf_data);
EXPORT_SYMBOL(read_dev_chars);
EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
EXPORT_SYMBOL(_ccw_device_get_device_number);
EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
EXPORT_SYMBOL_GPL(read_conf_data_lpm);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/s390/cio/device_ops.c
	3	*
1da177e4 LT	4	* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
	5	* IBM Corporation
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
4ce3b30c	7	* Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4	8	*/
1da177e4 LT	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/errno.h>
	12	#include <linux/slab.h>
	13	#include <linux/list.h>
	14	#include <linux/device.h>
	15	#include <linux/delay.h>
	16
	17	#include <asm/ccwdev.h>
	18	#include <asm/idals.h>
1da177e4 LT	19
	20	#include "cio.h"
	21	#include "cio_debug.h"
	22	#include "css.h"
	23	#include "chsc.h"
	24	#include "device.h"
1da177e4 LT	25
	26	int
	27	ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
	28	{
	29	/*
	30	* The flag usage is mutal exclusive ...
	31	*/
	32	if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
	33	(flags & CCWDEV_REPORT_ALL))
	34	return -EINVAL;
	35	cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
	36	cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
	37	cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
	38	cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
	39	return 0;
	40	}
	41
	42	int
	43	ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
	44	{
	45	struct subchannel *sch;
	46	int ret;
	47
	48	if (!cdev)
	49	return -ENODEV;
	50	if (cdev->private->state == DEV_STATE_NOT_OPER)
	51	return -ENODEV;
	52	if (cdev->private->state != DEV_STATE_ONLINE &&
	53	cdev->private->state != DEV_STATE_WAIT4IO &&
	54	cdev->private->state != DEV_STATE_W4SENSE)
	55	return -EINVAL;
	56	sch = to_subchannel(cdev->dev.parent);
	57	if (!sch)
	58	return -ENODEV;
	59	ret = cio_clear(sch);
	60	if (ret == 0)
	61	cdev->private->intparm = intparm;
	62	return ret;
	63	}
	64
	65	int
	66	ccw_device_start_key(struct ccw_device cdev, struct ccw1 cpa,
	67	unsigned long intparm, __u8 lpm, __u8 key,
	68	unsigned long flags)
	69	{
	70	struct subchannel *sch;
	71	int ret;
	72
	73	if (!cdev)
	74	return -ENODEV;
	75	sch = to_subchannel(cdev->dev.parent);
	76	if (!sch)
	77	return -ENODEV;
	78	if (cdev->private->state == DEV_STATE_NOT_OPER)
	79	return -ENODEV;
b4f7b1ee CH	80	if (cdev->private->state == DEV_STATE_VERIFY \|\|
b4f7b1ee CH	81	cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
1da177e4 LT	82	/* Remember to fake irb when finished. */
	83	if (!cdev->private->flags.fake_irb) {
	84	cdev->private->flags.fake_irb = 1;
	85	cdev->private->intparm = intparm;
	86	return 0;
	87	} else
	88	/* There's already a fake I/O around. */
	89	return -EBUSY;
	90	}
	91	if (cdev->private->state != DEV_STATE_ONLINE \|\|
	92	((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
	93	!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) \|\|
	94	cdev->private->flags.doverify)
	95	return -EBUSY;
	96	ret = cio_set_options (sch, flags);
	97	if (ret)
	98	return ret;
	99	ret = cio_start_key (sch, cpa, lpm, key);
	100	if (ret == 0)
	101	cdev->private->intparm = intparm;
	102	return ret;
	103	}
	104
	105
	106	int
	107	ccw_device_start_timeout_key(struct ccw_device cdev, struct ccw1 cpa,
	108	unsigned long intparm, __u8 lpm, __u8 key,
	109	unsigned long flags, int expires)
	110	{
	111	int ret;
	112
	113	if (!cdev)
	114	return -ENODEV;
	115	ccw_device_set_timeout(cdev, expires);
	116	ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
	117	if (ret != 0)
	118	ccw_device_set_timeout(cdev, 0);
	119	return ret;
	120	}
	121
	122	int
	123	ccw_device_start(struct ccw_device cdev, struct ccw1 cpa,
	124	unsigned long intparm, __u8 lpm, unsigned long flags)
	125	{
	126	return ccw_device_start_key(cdev, cpa, intparm, lpm,
0b642ede	127	PAGE_DEFAULT_KEY, flags);
1da177e4 LT	128	}
	129
	130	int
	131	ccw_device_start_timeout(struct ccw_device cdev, struct ccw1 cpa,
	132	unsigned long intparm, __u8 lpm, unsigned long flags,
	133	int expires)
	134	{
	135	return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
0b642ede	136	PAGE_DEFAULT_KEY, flags,
1da177e4 LT	137	expires);
	138	}
	139
	140
	141	int
	142	ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
	143	{
	144	struct subchannel *sch;
	145	int ret;
	146
	147	if (!cdev)
	148	return -ENODEV;
	149	if (cdev->private->state == DEV_STATE_NOT_OPER)
	150	return -ENODEV;
	151	if (cdev->private->state != DEV_STATE_ONLINE &&
	152	cdev->private->state != DEV_STATE_WAIT4IO &&
	153	cdev->private->state != DEV_STATE_W4SENSE)
	154	return -EINVAL;
	155	sch = to_subchannel(cdev->dev.parent);
	156	if (!sch)
	157	return -ENODEV;
	158	ret = cio_halt(sch);
	159	if (ret == 0)
	160	cdev->private->intparm = intparm;
	161	return ret;
	162	}
	163
	164	int
	165	ccw_device_resume(struct ccw_device *cdev)
	166	{
	167	struct subchannel *sch;
	168
	169	if (!cdev)
	170	return -ENODEV;
	171	sch = to_subchannel(cdev->dev.parent);
	172	if (!sch)
	173	return -ENODEV;
	174	if (cdev->private->state == DEV_STATE_NOT_OPER)
	175	return -ENODEV;
	176	if (cdev->private->state != DEV_STATE_ONLINE \|\|
	177	!(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
	178	return -EINVAL;
	179	return cio_resume(sch);
	180	}
	181
	182	/*
	183	* Pass interrupt to device driver.
	184	*/
	185	int
	186	ccw_device_call_handler(struct ccw_device *cdev)
	187	{
	188	struct subchannel *sch;
	189	unsigned int stctl;
	190	int ending_status;
	191
	192	sch = to_subchannel(cdev->dev.parent);
	193
	194	/*
	195	* we allow for the device action handler if .
	196	* - we received ending status
	197	* - the action handler requested to see all interrupts
	198	* - we received an intermediate status
	199	* - fast notification was requested (primary status)
	200	* - unsolicited interrupts
201	*/
202	stctl = cdev->private->irb.scsw.stctl;
203	ending_status = (stctl & SCSW_STCTL_SEC_STATUS) \|\|
204	(stctl == (SCSW_STCTL_ALERT_STATUS \| SCSW_STCTL_STATUS_PEND)) \|\|
205	(stctl == SCSW_STCTL_STATUS_PEND);
206	if (!ending_status &&
207	!cdev->private->options.repall &&
208	!(stctl & SCSW_STCTL_INTER_STATUS) &&
209	!(cdev->private->options.fast &&
210	(stctl & SCSW_STCTL_PRIM_STATUS)))
211	return 0;
212
213	/*
214	* Now we are ready to call the device driver interrupt handler.
215	*/
216	if (cdev->handler)
217	cdev->handler(cdev, cdev->private->intparm,
218	&cdev->private->irb);
219
220	/*
221	* Clear the old and now useless interrupt response block.
222	*/
223	memset(&cdev->private->irb, 0, sizeof(struct irb));
224
225	return 1;
226	}
227
228	/*
229	* Search for CIW command in extended sense data.
230	*/
231	struct ciw *
232	ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
233	{
234	int ciw_cnt;
235
236	if (cdev->private->flags.esid == 0)
237	return NULL;
238	for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
239	if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
240	return cdev->private->senseid.ciw + ciw_cnt;
241	return NULL;
242	}
243
244	__u8
245	ccw_device_get_path_mask(struct ccw_device *cdev)
246	{
247	struct subchannel *sch;
248
249	sch = to_subchannel(cdev->dev.parent);
250	if (!sch)
251	return 0;
252	else
253	return sch->vpm;
254	}
255
256	static void
257	ccw_device_wake_up(struct ccw_device cdev, unsigned long ip, struct irb irb)
258	{
259	if (!ip)
260	/* unsolicited interrupt */
261	return;
262
263	/* Abuse intparm for error reporting. */
264	if (IS_ERR(irb))
265	cdev->private->intparm = -EIO;
4bc0c4f9 CH	266	else if (irb->scsw.cc == 1)
	267	/* Retry for deferred condition code. */
	268	cdev->private->intparm = -EAGAIN;
1da177e4 LT	269	else if ((irb->scsw.dstat !=
	270	(DEV_STAT_CHN_END\|DEV_STAT_DEV_END)) \|\|
	271	(irb->scsw.cstat != 0)) {
	272	/*
	273	* We didn't get channel end / device end. Check if path
	274	* verification has been started; we can retry after it has
	275	* finished. We also retry unit checks except for command reject
da039bd1 PO	276	* or intervention required. Also check for long busy
da039bd1 PO	277	* conditions.
1da177e4 LT	278	*/
	279	if (cdev->private->flags.doverify \|\|
	280	cdev->private->state == DEV_STATE_VERIFY)
	281	cdev->private->intparm = -EAGAIN;
	282	if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
	283	!(irb->ecw[0] &
	284	(SNS0_CMD_REJECT \| SNS0_INTERVENTION_REQ)))
	285	cdev->private->intparm = -EAGAIN;
da039bd1 PO	286	else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
	287	(irb->scsw.dstat & DEV_STAT_DEV_END) &&
	288	(irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
	289	cdev->private->intparm = -EAGAIN;
1da177e4 LT	290	else
	291	cdev->private->intparm = -EIO;
	292
	293	} else
	294	cdev->private->intparm = 0;
	295	wake_up(&cdev->private->wait_q);
	296	}
	297
	298	static inline int
	299	__ccw_device_retry_loop(struct ccw_device cdev, struct ccw1 ccw, long magic, __u8 lpm)
	300	{
	301	int ret;
	302	struct subchannel *sch;
	303
	304	sch = to_subchannel(cdev->dev.parent);
	305	do {
	306	ret = cio_start (sch, ccw, lpm);
	307	if ((ret == -EBUSY) \|\| (ret == -EACCES)) {
	308	/* Try again later. */
	309	spin_unlock_irq(&sch->lock);
	310	msleep(10);
	311	spin_lock_irq(&sch->lock);
	312	continue;
	313	}
	314	if (ret != 0)
	315	/* Non-retryable error. */
	316	break;
	317	/* Wait for end of request. */
	318	cdev->private->intparm = magic;
	319	spin_unlock_irq(&sch->lock);
	320	wait_event(cdev->private->wait_q,
	321	(cdev->private->intparm == -EIO) \|\|
	322	(cdev->private->intparm == -EAGAIN) \|\|
	323	(cdev->private->intparm == 0));
	324	spin_lock_irq(&sch->lock);
	325	/* Check at least for channel end / device end */
	326	if (cdev->private->intparm == -EIO) {
	327	/* Non-retryable error. */
	328	ret = -EIO;
	329	break;
	330	}
	331	if (cdev->private->intparm == 0)
	332	/* Success. */
	333	break;
	334	/* Try again later. */
	335	spin_unlock_irq(&sch->lock);
	336	msleep(10);
	337	spin_lock_irq(&sch->lock);
	338	} while (1);
	339
	340	return ret;
	341	}
	342
	343	/**
	344	* read_dev_chars() - read device characteristics
	345	* @param cdev target ccw device
	346	* @param buffer pointer to buffer for rdc data
	347	* @param length size of rdc data
	348	* @returns 0 for success, negative error value on failure
	349	*
	350	* Context:
	351	* called for online device, lock not held
	352	**/
	353	int
354	read_dev_chars (struct ccw_device cdev, void *buffer, int length)
355	{
356	void (handler)(struct ccw_device , unsigned long, struct irb *);
357	struct subchannel *sch;
358	int ret;
359	struct ccw1 *rdc_ccw;
360
361	if (!cdev)
362	return -ENODEV;
363	if (!buffer \|\| !length)
364	return -EINVAL;
365	sch = to_subchannel(cdev->dev.parent);
366
367	CIO_TRACE_EVENT (4, "rddevch");
368	CIO_TRACE_EVENT (4, sch->dev.bus_id);
369
88abaab4	370	rdc_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL \| GFP_DMA);
1da177e4 LT	371	if (!rdc_ccw)
1da177e4 LT	372	return -ENOMEM;
1da177e4 LT	373	rdc_ccw->cmd_code = CCW_CMD_RDC;
	374	rdc_ccw->count = length;
	375	rdc_ccw->flags = CCW_FLAG_SLI;
	376	ret = set_normalized_cda (rdc_ccw, (*buffer));
	377	if (ret != 0) {
	378	kfree(rdc_ccw);
	379	return ret;
	380	}
	381
	382	spin_lock_irq(&sch->lock);
	383	/* Save interrupt handler. */
	384	handler = cdev->handler;
	385	/* Temporarily install own handler. */
	386	cdev->handler = ccw_device_wake_up;
	387	if (cdev->private->state != DEV_STATE_ONLINE)
	388	ret = -ENODEV;
	389	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
	390	!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) \|\|
	391	cdev->private->flags.doverify)
	392	ret = -EBUSY;
	393	else
	394	/* 0x00D9C4C3 == ebcdic "RDC" */
	395	ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);
	396
	397	/* Restore interrupt handler. */
	398	cdev->handler = handler;
	399	spin_unlock_irq(&sch->lock);
	400
	401	clear_normalized_cda (rdc_ccw);
	402	kfree(rdc_ccw);
	403
	404	return ret;
	405	}
	406
	407	/*
	408	* Read Configuration data using path mask
	409	*/
	410	int
	411	read_conf_data_lpm (struct ccw_device cdev, void buffer, int length, __u8 lpm)
	412	{
	413	void (handler)(struct ccw_device , unsigned long, struct irb *);
	414	struct subchannel *sch;
	415	struct ciw *ciw;
	416	char *rcd_buf;
	417	int ret;
	418	struct ccw1 *rcd_ccw;
	419
	420	if (!cdev)
	421	return -ENODEV;
	422	if (!buffer \|\| !length)
	423	return -EINVAL;
	424	sch = to_subchannel(cdev->dev.parent);
	425
	426	CIO_TRACE_EVENT (4, "rdconf");
	427	CIO_TRACE_EVENT (4, sch->dev.bus_id);
	428
	429	/*
	430	* scan for RCD command in extended SenseID data
	431	*/
	432	ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
	433	if (!ciw \|\| ciw->cmd == 0)
	434	return -EOPNOTSUPP;
	435
88abaab4	436	rcd_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL \| GFP_DMA);
1da177e4 LT	437	if (!rcd_ccw)
1da177e4 LT	438	return -ENOMEM;
88abaab4	439	rcd_buf = kzalloc(ciw->count, GFP_KERNEL \| GFP_DMA);
1da177e4 LT	440	if (!rcd_buf) {
	441	kfree(rcd_ccw);
	442	return -ENOMEM;
	443	}
1da177e4 LT	444	rcd_ccw->cmd_code = ciw->cmd;
	445	rcd_ccw->cda = (__u32) __pa (rcd_buf);
	446	rcd_ccw->count = ciw->count;
	447	rcd_ccw->flags = CCW_FLAG_SLI;
	448
	449	spin_lock_irq(&sch->lock);
	450	/* Save interrupt handler. */
	451	handler = cdev->handler;
	452	/* Temporarily install own handler. */
	453	cdev->handler = ccw_device_wake_up;
	454	if (cdev->private->state != DEV_STATE_ONLINE)
	455	ret = -ENODEV;
	456	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
	457	!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) \|\|
	458	cdev->private->flags.doverify)
	459	ret = -EBUSY;
	460	else
	461	/* 0x00D9C3C4 == ebcdic "RCD" */
	462	ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);
	463
	464	/* Restore interrupt handler. */
	465	cdev->handler = handler;
	466	spin_unlock_irq(&sch->lock);
	467
	468	/*
	469	* on success we update the user input parms
	470	*/
	471	if (ret) {
	472	kfree (rcd_buf);
	473	*buffer = NULL;
	474	*length = 0;
	475	} else {
	476	*length = ciw->count;
	477	*buffer = rcd_buf;
	478	}
	479	kfree(rcd_ccw);
	480
	481	return ret;
	482	}
	483
	484	/*
	485	* Read Configuration data
	486	*/
	487	int
	488	read_conf_data (struct ccw_device cdev, void buffer, int length)
	489	{
	490	return read_conf_data_lpm (cdev, buffer, length, 0);
	491	}
	492
	493	/*
	494	* Try to break the lock on a boxed device.
	495	*/
	496	int
	497	ccw_device_stlck(struct ccw_device *cdev)
	498	{
	499	void buf, buf2;
	500	unsigned long flags;
	501	struct subchannel *sch;
	502	int ret;
	503
	504	if (!cdev)
	505	return -ENODEV;
	506
	507	if (cdev->drv && !cdev->private->options.force)
508	return -EINVAL;
509
510	sch = to_subchannel(cdev->dev.parent);
511
512	CIO_TRACE_EVENT(2, "stl lock");
513	CIO_TRACE_EVENT(2, cdev->dev.bus_id);
514
515	buf = kmalloc(32*sizeof(char), GFP_DMA\|GFP_KERNEL);
516	if (!buf)
517	return -ENOMEM;
518	buf2 = kmalloc(32*sizeof(char), GFP_DMA\|GFP_KERNEL);
519	if (!buf2) {
520	kfree(buf);
521	return -ENOMEM;
522	}
523	spin_lock_irqsave(&sch->lock, flags);
524	ret = cio_enable_subchannel(sch, 3);
525	if (ret)
526	goto out_unlock;
527	/*
528	* Setup ccw. We chain an unconditional reserve and a release so we
529	* only break the lock.
530	*/
531	cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
532	cdev->private->iccws[0].cda = (__u32) __pa(buf);
533	cdev->private->iccws[0].count = 32;
534	cdev->private->iccws[0].flags = CCW_FLAG_CC;
535	cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
536	cdev->private->iccws[1].cda = (__u32) __pa(buf2);
537	cdev->private->iccws[1].count = 32;
538	cdev->private->iccws[1].flags = 0;
539	ret = cio_start(sch, cdev->private->iccws, 0);
540	if (ret) {
541	cio_disable_subchannel(sch); //FIXME: return code?
542	goto out_unlock;
543	}
544	cdev->private->irb.scsw.actl \|= SCSW_ACTL_START_PEND;
545	spin_unlock_irqrestore(&sch->lock, flags);
546	wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
547	spin_lock_irqsave(&sch->lock, flags);
548	cio_disable_subchannel(sch); //FIXME: return code?
549	if ((cdev->private->irb.scsw.dstat !=
550	(DEV_STAT_CHN_END\|DEV_STAT_DEV_END)) \|\|
551	(cdev->private->irb.scsw.cstat != 0))
552	ret = -EIO;
553	/* Clear irb. */
554	memset(&cdev->private->irb, 0, sizeof(struct irb));
555	out_unlock:
17fd682e JJ	556	kfree(buf);
17fd682e JJ	557	kfree(buf2);
1da177e4 LT	558	spin_unlock_irqrestore(&sch->lock, flags);
	559	return ret;
	560	}
	561
	562	void *
	563	ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
	564	{
	565	struct subchannel *sch;
	566
	567	sch = to_subchannel(cdev->dev.parent);
	568	return chsc_get_chp_desc(sch, chp_no);
	569	}
	570
	571	// FIXME: these have to go:
	572
	573	int
	574	_ccw_device_get_subchannel_number(struct ccw_device *cdev)
	575	{
a8237fc4	576	return cdev->private->sch_no;
1da177e4 LT	577	}
	578
	579	int
	580	_ccw_device_get_device_number(struct ccw_device *cdev)
	581	{
	582	return cdev->private->devno;
	583	}
	584
	585
	586	MODULE_LICENSE("GPL");
	587	EXPORT_SYMBOL(ccw_device_set_options);
	588	EXPORT_SYMBOL(ccw_device_clear);
	589	EXPORT_SYMBOL(ccw_device_halt);
	590	EXPORT_SYMBOL(ccw_device_resume);
	591	EXPORT_SYMBOL(ccw_device_start_timeout);
	592	EXPORT_SYMBOL(ccw_device_start);
	593	EXPORT_SYMBOL(ccw_device_start_timeout_key);
	594	EXPORT_SYMBOL(ccw_device_start_key);
	595	EXPORT_SYMBOL(ccw_device_get_ciw);
	596	EXPORT_SYMBOL(ccw_device_get_path_mask);
	597	EXPORT_SYMBOL(read_conf_data);
	598	EXPORT_SYMBOL(read_dev_chars);
	599	EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
	600	EXPORT_SYMBOL(_ccw_device_get_device_number);
	601	EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
	602	EXPORT_SYMBOL_GPL(read_conf_data_lpm);