tape_3590.c

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		return;
	}
	PRINT_WARN("(%s): Device Message(%x)\n",
		   device->cdev->dev.bus_id, sense->mc);
}

static int tape_3590_crypt_error(struct tape_device *device,
				 struct tape_request *request, struct irb *irb)
{
	u8 cu_rc, ekm_rc1;
	u16 ekm_rc2;
	u32 drv_rc;
	char *bus_id, *sense;

	sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
	bus_id = device->cdev->dev.bus_id;
	cu_rc = sense[0];
	drv_rc = *((u32*) &sense[5]) & 0xffffff;
	ekm_rc1 = sense[9];
	ekm_rc2 = *((u16*) &sense[10]);
	if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
		/* key not defined on EKM */
		return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
	if ((cu_rc == 1) || (cu_rc == 2))
		/* No connection to EKM */
		return tape_3590_erp_basic(device, request, irb, -ENOTCONN);

	PRINT_ERR("(%s): Unable to get encryption key from EKM\n", bus_id);
	PRINT_ERR("(%s): CU=%02X DRIVE=%06X EKM=%02X:%04X\n", bus_id, cu_rc,
		drv_rc, ekm_rc1, ekm_rc2);

	return tape_3590_erp_basic(device, request, irb, -ENOKEY);
}

/*
 *  3590 error Recovery routine:
 *  If possible, it tries to recover from the error. If this is not possible,
 *  inform the user about the problem.
 */
static int
tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
		     struct irb *irb)
{
	struct tape_3590_sense *sense;
	int rc;

#ifdef CONFIG_S390_TAPE_BLOCK
	if (request->op == TO_BLOCK) {
		/*
		 * Recovery for block device requests. Set the block_position
		 * to something invalid and retry.
		 */
		device->blk_data.block_position = -1;
		if (request->retries-- <= 0)
			return tape_3590_erp_failed(device, request, irb, -EIO);
		else
			return tape_3590_erp_retry(device, request, irb);
	}
#endif

	sense = (struct tape_3590_sense *) irb->ecw;

	DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);

	/*
	 * First check all RC-QRCs where we want to do something special
	 *   - "break":     basic error recovery is done
	 *   - "goto out:": just print error message if available
	 */
	rc = -EIO;
	switch (sense->rc_rqc) {

	case 0x1110:
		tape_3590_print_era_msg(device, irb);
		return tape_3590_erp_read_buf_log(device, request, irb);

	case 0x2011:
		tape_3590_print_era_msg(device, irb);
		return tape_3590_erp_read_alternate(device, request, irb);

	case 0x2230:
	case 0x2231:
		tape_3590_print_era_msg(device, irb);
		return tape_3590_erp_special_interrupt(device, request, irb);
	case 0x2240:
		return tape_3590_crypt_error(device, request, irb);

	case 0x3010:
		DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
			  device->cdev_id);
		return tape_3590_erp_basic(device, request, irb, -ENOSPC);
	case 0x3012:
		DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
			  device->cdev_id);
		return tape_3590_erp_basic(device, request, irb, -ENOSPC);
	case 0x3020:
		DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
		return tape_3590_erp_basic(device, request, irb, -ENOSPC);

	case 0x3122:
		DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
			  device->cdev_id);
		return tape_3590_erp_basic(device, request, irb, -EIO);
	case 0x3123:
		DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
			  device->cdev_id);
		tape_med_state_set(device, MS_UNLOADED);
		tape_3590_schedule_work(device, TO_CRYPT_OFF);
		return tape_3590_erp_basic(device, request, irb, 0);

	case 0x4010:
		/*
		 * print additional msg since default msg
		 * "device intervention" is not very meaningfull
		 */
		PRINT_WARN("(%s): Tape operation when medium not loaded\n",
			   device->cdev->dev.bus_id);
		tape_med_state_set(device, MS_UNLOADED);
		tape_3590_schedule_work(device, TO_CRYPT_OFF);
		return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
	case 0x4012:		/* Device Long Busy */
		/* XXX: Also use long busy handling here? */
		DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
		tape_3590_print_era_msg(device, irb);
		return tape_3590_erp_basic(device, request, irb, -EBUSY);
	case 0x4014:
		DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
		return tape_3590_erp_long_busy(device, request, irb);

	case 0x5010:
		if (sense->rac == 0xd0) {
			/* Swap */
			tape_3590_print_era_msg(device, irb);
			return tape_3590_erp_swap(device, request, irb);
		}
		if (sense->rac == 0x26) {
			/* Read Opposite */
			tape_3590_print_era_msg(device, irb);
			return tape_3590_erp_read_opposite(device, request,
							   irb);
		}
		return tape_3590_erp_basic(device, request, irb, -EIO);
	case 0x5020:
	case 0x5021:
	case 0x5022:
	case 0x5040:
	case 0x5041:
	case 0x5042:
		tape_3590_print_era_msg(device, irb);
		return tape_3590_erp_swap(device, request, irb);

	case 0x5110:
	case 0x5111:
		return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);

	case 0x5120:
	case 0x1120:
		tape_med_state_set(device, MS_UNLOADED);
		tape_3590_schedule_work(device, TO_CRYPT_OFF);
		return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);

	case 0x6020:
		PRINT_WARN("(%s): Cartridge of wrong type ?\n",
			   device->cdev->dev.bus_id);
		return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);

	case 0x8011:
		PRINT_WARN("(%s): Another host has reserved the tape device\n",
			   device->cdev->dev.bus_id);
		return tape_3590_erp_basic(device, request, irb, -EPERM);
	case 0x8013:
		PRINT_WARN("(%s): Another host has priviliged access to the "
			   "tape device\n", device->cdev->dev.bus_id);
		PRINT_WARN("(%s): To solve the problem unload the current "
			   "cartridge!\n", device->cdev->dev.bus_id);
		return tape_3590_erp_basic(device, request, irb, -EPERM);
	default:
		return tape_3590_erp_basic(device, request, irb, -EIO);
	}
}

/*
 * 3590 interrupt handler:
 */
static int
tape_3590_irq(struct tape_device *device, struct tape_request *request,
	      struct irb *irb)
{
	if (request == NULL)
		return tape_3590_unsolicited_irq(device, irb);

	if ((irb->scsw.dstat & DEV_STAT_UNIT_EXCEP) &&
	    (irb->scsw.dstat & DEV_STAT_DEV_END) && (request->op == TO_WRI)) {
		/* Write at end of volume */
		DBF_EVENT(2, "End of volume\n");
		return tape_3590_erp_failed(device, request, irb, -ENOSPC);
	}

	if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
		return tape_3590_unit_check(device, request, irb);

	if (irb->scsw.dstat & DEV_STAT_DEV_END) {
		if (irb->scsw.dstat == DEV_STAT_UNIT_EXCEP) {
			if (request->op == TO_FSB || request->op == TO_BSB)
				request->rescnt++;
			else
				DBF_EVENT(5, "Unit Exception!\n");
		}

		return tape_3590_done(device, request);
	}

	if (irb->scsw.dstat & DEV_STAT_CHN_END) {
		DBF_EVENT(2, "cannel end\n");
		return TAPE_IO_PENDING;
	}

	if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
		DBF_EVENT(2, "Unit Attention when busy..\n");
		return TAPE_IO_PENDING;
	}

	DBF_EVENT(6, "xunknownirq\n");
	PRINT_ERR("Unexpected interrupt.\n");
	PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
	tape_dump_sense(device, request, irb);
	return TAPE_IO_STOP;
}


static int tape_3590_read_dev_chars(struct tape_device *device,
				    struct tape_3590_rdc_data *rdc_data)
{
	int rc;
	struct tape_request *request;

	request = tape_alloc_request(1, sizeof(*rdc_data));
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_RDC;
	tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
		     request->cpdata);
	rc = tape_do_io(device, request);
	if (rc == 0)
		memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
	tape_free_request(request);
	return rc;
}

/*
 * Setup device function
 */
static int
tape_3590_setup_device(struct tape_device *device)
{
	int rc;
	struct tape_3590_disc_data *data;
	struct tape_3590_rdc_data *rdc_data;

	DBF_EVENT(6, "3590 device setup\n");
	data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
	if (data == NULL)
		return -ENOMEM;
	data->read_back_op = READ_PREVIOUS;
	device->discdata = data;

	rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
	if (!rdc_data) {
		rc = -ENOMEM;
		goto fail_kmalloc;
	}
	rc = tape_3590_read_dev_chars(device, rdc_data);
	if (rc) {
		DBF_LH(3, "Read device characteristics failed!\n");
		goto fail_kmalloc;
	}
	rc = tape_std_assign(device);
	if (rc)
		goto fail_rdc_data;
	if (rdc_data->data[31] == 0x13) {
		PRINT_INFO("Device has crypto support\n");
		data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
		tape_3592_disable_crypt(device);
	} else {
		DBF_EVENT(6, "Device has NO crypto support\n");
	}
	/* Try to find out if medium is loaded */
	rc = tape_3590_sense_medium(device);
	if (rc) {
		DBF_LH(3, "3590 medium sense returned %d\n", rc);
		goto fail_rdc_data;
	}
	return 0;

fail_rdc_data:
	kfree(rdc_data);
fail_kmalloc:
	kfree(data);
	return rc;
}

/*
 * Cleanup device function
 */
static void
tape_3590_cleanup_device(struct tape_device *device)
{
	flush_scheduled_work();
	tape_std_unassign(device);

	kfree(device->discdata);
	device->discdata = NULL;
}

/*
 * List of 3590 magnetic tape commands.
 */
static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
	[MTRESET]	 = tape_std_mtreset,
	[MTFSF]		 = tape_std_mtfsf,
	[MTBSF]		 = tape_std_mtbsf,
	[MTFSR]		 = tape_std_mtfsr,
	[MTBSR]		 = tape_std_mtbsr,
	[MTWEOF]	 = tape_std_mtweof,
	[MTREW]		 = tape_std_mtrew,
	[MTOFFL]	 = tape_std_mtoffl,
	[MTNOP]		 = tape_std_mtnop,
	[MTRETEN]	 = tape_std_mtreten,
	[MTBSFM]	 = tape_std_mtbsfm,
	[MTFSFM]	 = tape_std_mtfsfm,
	[MTEOM]		 = tape_std_mteom,
	[MTERASE]	 = tape_std_mterase,
	[MTRAS1]	 = NULL,
	[MTRAS2]	 = NULL,
	[MTRAS3]	 = NULL,
	[MTSETBLK]	 = tape_std_mtsetblk,
	[MTSETDENSITY]	 = NULL,
	[MTSEEK]	 = tape_3590_mtseek,
	[MTTELL]	 = tape_3590_mttell,
	[MTSETDRVBUFFER] = NULL,
	[MTFSS]		 = NULL,
	[MTBSS]		 = NULL,
	[MTWSM]		 = NULL,
	[MTLOCK]	 = NULL,
	[MTUNLOCK]	 = NULL,
	[MTLOAD]	 = tape_std_mtload,
	[MTUNLOAD]	 = tape_std_mtunload,
	[MTCOMPRESSION]	 = tape_std_mtcompression,
	[MTSETPART]	 = NULL,
	[MTMKPART]	 = NULL
};

/*
 * Tape discipline structure for 3590.
 */
static struct tape_discipline tape_discipline_3590 = {
	.owner = THIS_MODULE,
	.setup_device = tape_3590_setup_device,
	.cleanup_device = tape_3590_cleanup_device,
	.process_eov = tape_std_process_eov,
	.irq = tape_3590_irq,
	.read_block = tape_std_read_block,
	.write_block = tape_std_write_block,
#ifdef CONFIG_S390_TAPE_BLOCK
	.bread = tape_3590_bread,
	.free_bread = tape_3590_free_bread,
	.check_locate = tape_3590_check_locate,
#endif
	.ioctl_fn = tape_3590_ioctl,
	.mtop_array = tape_3590_mtop
};

static struct ccw_device_id tape_3590_ids[] = {
	{CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
	{CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
	{ /* end of list */ }
};

static int
tape_3590_online(struct ccw_device *cdev)
{
	return tape_generic_online(cdev->dev.driver_data,
				   &tape_discipline_3590);
}

static int
tape_3590_offline(struct ccw_device *cdev)
{
	return tape_generic_offline(cdev->dev.driver_data);
}

static struct ccw_driver tape_3590_driver = {
	.name = "tape_3590",
	.owner = THIS_MODULE,
	.ids = tape_3590_ids,
	.probe = tape_generic_probe,
	.remove = tape_generic_remove,
	.set_offline = tape_3590_offline,
	.set_online = tape_3590_online,
};

/*
 * Setup discipline structure.
 */
static int
tape_3590_init(void)
{
	int rc;

	TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
	debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
#ifdef DBF_LIKE_HELL
	debug_set_level(TAPE_DBF_AREA, 6);
#endif

	DBF_EVENT(3, "3590 init\n");
	/* Register driver for 3590 tapes. */
	rc = ccw_driver_register(&tape_3590_driver);
	if (rc)
		DBF_EVENT(3, "3590 init failed\n");
	else
		DBF_EVENT(3, "3590 registered\n");
	return rc;
}

static void
tape_3590_exit(void)
{
	ccw_driver_unregister(&tape_3590_driver);

	debug_unregister(TAPE_DBF_AREA);
}

MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
MODULE_LICENSE("GPL");

module_init(tape_3590_init);
module_exit(tape_3590_exit);