path: root/drivers/s390/cio/chsc.c

/*
 *  drivers/s390/cio/chsc.c
 *   S/390 common I/O routines -- channel subsystem call
 *
 *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
 *			      IBM Corporation
 *    Author(s): Ingo Adlung (adlung@de.ibm.com)
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Arnd Bergmann (arndb@de.ibm.com)
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>

#include <asm/cio.h>

#include "css.h"
#include "cio.h"
#include "cio_debug.h"
#include "ioasm.h"
#include "chpid.h"
#include "chp.h"
#include "chsc.h"

static void *sei_page;

/* FIXME: this is _always_ called for every subchannel. shouldn't we
 *	  process more than one at a time? */
static int
chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
{
	int ccode, j;

	struct {
		struct chsc_header request;
		u16 reserved1a:10;
		u16 ssid:2;
		u16 reserved1b:4;
		u16 f_sch;	  /* first subchannel */
		u16 reserved2;
		u16 l_sch;	  /* last subchannel */
		u32 reserved3;
		struct chsc_header response;
		u32 reserved4;
		u8 sch_valid : 1;
		u8 dev_valid : 1;
		u8 st	     : 3; /* subchannel type */
		u8 zeroes    : 3;
		u8  unit_addr;	  /* unit address */
		u16 devno;	  /* device number */
		u8 path_mask;
		u8 fla_valid_mask;
		u16 sch;	  /* subchannel */
		u8 chpid[8];	  /* chpids 0-7 */
		u16 fla[8];	  /* full link addresses 0-7 */
	} __attribute__ ((packed)) *ssd_area;

	ssd_area = page;

	ssd_area->request.length = 0x0010;
	ssd_area->request.code = 0x0004;

	ssd_area->ssid = sch->schid.ssid;
	ssd_area->f_sch = sch->schid.sch_no;
	ssd_area->l_sch = sch->schid.sch_no;

	ccode = chsc(ssd_area);
	if (ccode > 0) {
		pr_debug("chsc returned with ccode = %d\n", ccode);
		return (ccode == 3) ? -ENODEV : -EBUSY;
	}

	switch (ssd_area->response.code) {
	case 0x0001: /* everything ok */
		break;
	case 0x0002:
		CIO_CRW_EVENT(2, "Invalid command!\n");
		return -EINVAL;
	case 0x0003:
		CIO_CRW_EVENT(2, "Error in chsc request block!\n");
		return -EINVAL;
	case 0x0004:
		CIO_CRW_EVENT(2, "Model does not provide ssd\n");
		return -EOPNOTSUPP;
	default:
		CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
			      ssd_area->response.code);
		return -EIO;
	}

	/*
	 * ssd_area->st stores the type of the detected
	 * subchannel, with the following definitions:
	 *
	 * 0: I/O subchannel:	  All fields have meaning
	 * 1: CHSC subchannel:	  Only sch_val, st and sch
	 *			  have meaning
	 * 2: Message subchannel: All fields except unit_addr
	 *			  have meaning
	 * 3: ADM subchannel:	  Only sch_val, st and sch
	 *			  have meaning
	 *
	 * Other types are currently undefined.
	 */
	if (ssd_area->st > 3) { /* uhm, that looks strange... */
		CIO_CRW_EVENT(0,