tty: powerpc: remove hvc_iseries

	depends on HVC_CONSOLE

	default n

config HVC_ISERIES

	bool "iSeries Hypervisor Virtual Console support"

	depends on PPC_ISERIES

	default y

	select HVC_DRIVER

	select HVC_IRQ

	select VIOPATH

	help

	  iSeries machines support a hypervisor virtual console.

config HVC_OPAL

	bool "OPAL Console support"

	depends on PPC_POWERNV

obj-$(CONFIG_HVC_CONSOLE)	+= hvc_vio.o hvsi_lib.o

obj-$(CONFIG_HVC_OPAL)		+= hvc_opal.o hvsi_lib.o

obj-$(CONFIG_HVC_OLD_HVSI)	+= hvsi.o

obj-$(CONFIG_HVC_ISERIES)	+= hvc_iseries.o

obj-$(CONFIG_HVC_RTAS)		+= hvc_rtas.o

obj-$(CONFIG_HVC_TILE)		+= hvc_tile.o

obj-$(CONFIG_HVC_DCC)		+= hvc_dcc.o

/*

 * iSeries vio driver interface to hvc_console.c

 *

 * This code is based heavily on hvc_vio.c and viocons.c

 *

 * Copyright (C) 2006 Stephen Rothwell, IBM Corporation

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

 */

#include <stdarg.h>

#include <linux/types.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/spinlock.h>

#include <linux/console.h>

#include <asm/hvconsole.h>

#include <asm/vio.h>

#include <asm/prom.h>

#include <asm/firmware.h>

#include <asm/iseries/vio.h>

#include <asm/iseries/hv_call.h>

#include <asm/iseries/hv_lp_config.h>

#include <asm/iseries/hv_lp_event.h>

#include "hvc_console.h"

#define VTTY_PORTS 10

static DEFINE_SPINLOCK(consolelock);

static DEFINE_SPINLOCK(consoleloglock);

static const char hvc_driver_name[] = "hvc_console";

#define IN_BUF_SIZE	200

/*

 * Our port information.

 */

static struct port_info {

	HvLpIndex lp;

	u64 seq;	/* sequence number of last HV send */

	u64 ack;	/* last ack from HV */

	struct hvc_struct *hp;

	int in_start;

	int in_end;

	unsigned char in_buf[IN_BUF_SIZE];

} port_info[VTTY_PORTS] = {

	[ 0 ... VTTY_PORTS - 1 ] = {

		.lp = HvLpIndexInvalid

	}

};

#define viochar_is_console(pi)	((pi) == &port_info[0])

static struct vio_device_id hvc_driver_table[] __devinitdata = {

	{"serial", "IBM,iSeries-vty"},

	{ "", "" }

};

MODULE_DEVICE_TABLE(vio, hvc_driver_table);

static void hvlog(char *fmt, ...)

{

	int i;

	unsigned long flags;

	va_list args;

	static char buf[256];

	spin_lock_irqsave(&consoleloglock, flags);

	va_start(args, fmt);

	i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);

	va_end(args);

	buf[i++] = '\r';

	HvCall_writeLogBuffer(buf, i);

	spin_unlock_irqrestore(&consoleloglock, flags);

}

/*

 * Initialize the common fields in a charLpEvent

 */

static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp)

{

	struct HvLpEvent *hev = &viochar->event;

	memset(viochar, 0, sizeof(struct viocharlpevent));

	hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |

		HV_LP_EVENT_INT;

	hev->xType = HvLpEvent_Type_VirtualIo;

	hev->xSubtype = viomajorsubtype_chario | viochardata;

	hev->xSourceLp = HvLpConfig_getLpIndex();

	hev->xTargetLp = lp;

	hev->xSizeMinus1 = sizeof(struct viocharlpevent);

	hev->xSourceInstanceId = viopath_sourceinst(lp);

	hev->xTargetInstanceId = viopath_targetinst(lp);

}

static int get_chars(uint32_t vtermno, char *buf, int count)

{

	struct port_info *pi;

	int n = 0;

	unsigned long flags;

	if (vtermno >= VTTY_PORTS)

		return -EINVAL;

	if (count == 0)

		return 0;

	pi = &port_info[vtermno];

	spin_lock_irqsave(&consolelock, flags);

	if (pi->in_end == 0)

		goto done;

	n = pi->in_end - pi->in_start;

	if (n > count)

		n = count;

	memcpy(buf, &pi->in_buf[pi->in_start], n);

	pi->in_start += n;

	if (pi->in_start == pi->in_end) {

		pi->in_start = 0;

		pi->in_end = 0;

	}

done:

	spin_unlock_irqrestore(&consolelock, flags);

	return n;

}

static int put_chars(uint32_t vtermno, const char *buf, int count)

{

	struct viocharlpevent *viochar;

	struct port_info *pi;

	HvLpEvent_Rc hvrc;

	unsigned long flags;

	int sent = 0;

	if (vtermno >= VTTY_PORTS)

		return -EINVAL;

	pi = &port_info[vtermno];

	spin_lock_irqsave(&consolelock, flags);

	if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {

		HvCall_writeLogBuffer(buf, count);

		sent = count;

		goto done;

	}

	viochar = vio_get_event_buffer(viomajorsubtype_chario);

	if (viochar == NULL) {

		hvlog("\n\rviocons: Can't get viochar buffer.");

		goto done;

	}

	while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {

		int len;

		len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;

		if (viochar_is_console(pi))

			HvCall_writeLogBuffer(buf, len);

		init_data_event(viochar, pi->lp);

		viochar->len = len;

		viochar->event.xCorrelationToken = pi->seq++;

		viochar->event.xSizeMinus1 =

			offsetof(struct viocharlpevent, data) + len;

		memcpy(viochar->data, buf, len);

		hvrc = HvCallEvent_signalLpEvent(&viochar->event);

		if (hvrc)

			hvlog("\n\rerror sending event! return code %d\n\r",

				(int)hvrc);

		sent += len;

		count -= len;

		buf += len;

	}

	vio_free_event_buffer(viomajorsubtype_chario, viochar);

done:

	spin_unlock_irqrestore(&consolelock, flags);

	return sent;

}

static const struct hv_ops hvc_get_put_ops = {

	.get_chars = get_chars,

	.put_chars = put_chars,

	.notifier_add = notifier_add_irq,

	.notifier_del = notifier_del_irq,

	.notifier_hangup = notifier_hangup_irq,

};

static int __devinit hvc_vio_probe(struct vio_dev *vdev,

			const struct vio_device_id *id)

{

	struct hvc_struct *hp;

	struct port_info *pi;

	/* probed with invalid parameters. */

	if (!vdev || !id)

		return -EPERM;

	if (vdev->unit_address >= VTTY_PORTS)

		return -ENODEV;

	pi = &port_info[vdev->unit_address];

	hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,

			VIOCHAR_MAX_DATA);

	if (IS_ERR(hp))

		return PTR_ERR(hp);

	pi->hp = hp;

	dev_set_drvdata(&vdev->dev, pi);

	return 0;

}

static int __devexit hvc_vio_remove(struct vio_dev *vdev)

{

	struct port_info *pi = dev_get_drvdata(&vdev->dev);

	struct hvc_struct *hp = pi->hp;

	return hvc_remove(hp);

}

static struct vio_driver hvc_vio_driver = {

	.id_table	= hvc_driver_table,

	.probe		= hvc_vio_probe,

	.remove		= __devexit_p(hvc_vio_remove),

	.driver		= {

		.name	= hvc_driver_name,

		.owner	= THIS_MODULE,

	}

};

static void hvc_open_event(struct HvLpEvent *event)

{

	unsigned long flags;

	struct viocharlpevent *cevent = (struct viocharlpevent *)event;

	u8 port = cevent->virtual_device;

	struct port_info *pi;

	int reject = 0;

	if (hvlpevent_is_ack(event)) {

		if (port >= VTTY_PORTS)

			return;

		spin_lock_irqsave(&consolelock, flags);

		pi = &port_info[port];

		if (event->xRc == HvLpEvent_Rc_Good) {

			pi->seq = pi->ack = 0;

			/*

			 * This line allows connections from the primary

			 * partition but once one is connected from the

			 * primary partition nothing short of a reboot

			 * of linux will allow access from the hosting

			 * partition again without a required iSeries fix.

			 */

			pi->lp = event->xTargetLp;

		}

		spin_unlock_irqrestore(&consolelock, flags);

		if (event->xRc != HvLpEvent_Rc_Good)

			printk(KERN_WARNING

			       "hvc: handle_open_event: event->xRc == (%d).\n",

			       event->xRc);

		if (event->xCorrelationToken != 0) {

			atomic_t *aptr= (atomic_t *)event->xCorrelationToken;

			atomic_set(aptr, 1);

		} else

			printk(KERN_WARNING

			       "hvc: weird...got open ack without atomic\n");

		return;

	}

	/* This had better require an ack, otherwise complain */

	if (!hvlpevent_need_ack(event)) {

		printk(KERN_WARNING "hvc: viocharopen without ack bit!\n");

		return;

	}

	spin_lock_irqsave(&consolelock, flags);

	/* Make sure this is a good virtual tty */

	if (port >= VTTY_PORTS) {

		event->xRc = HvLpEvent_Rc_SubtypeError;

		cevent->subtype_result_code = viorc_openRejected;

		/*

		 * Flag state here since we can't printk while holding

		 * the consolelock spinlock.

		 */

		reject = 1;

	} else {

		pi = &port_info[port];

		if ((pi->lp != HvLpIndexInvalid) &&

				(pi->lp != event->xSourceLp)) {

			/*

			 * If this is tty is already connected to a different

			 * partition, fail.

			 */

			event->xRc = HvLpEvent_Rc_SubtypeError;

			cevent->subtype_result_code = viorc_openRejected;

			reject = 2;

		} else {

			pi->lp = event->xSourceLp;

			event->xRc = HvLpEvent_Rc_Good;

			cevent->subtype_result_code = viorc_good;

			pi->seq = pi->ack = 0;

		}

	}

	spin_unlock_irqrestore(&consolelock, flags);

	if (reject == 1)

		printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n");

	else if (reject == 2)

		printk(KERN_WARNING "hvc: open rejected: console in exclusive "

				"use by another partition.\n");

	/* Return the acknowledgement */

	HvCallEvent_ackLpEvent(event);

}

/*

 * Handle a close charLpEvent.  This should ONLY be an Interrupt because the

 * virtual console should never actually issue a close event to the hypervisor

 * because the virtual console never goes away.  A close event coming from the

 * hypervisor simply means that there are no client consoles connected to the

 * virtual console.

 */

static void hvc_close_event(struct HvLpEvent *event)

{

	unsigned long flags;

	struct viocharlpevent *cevent = (struct viocharlpevent *)event;

	u8 port = cevent->virtual_device;

	if (!hvlpevent_is_int(event)) {

		printk(KERN_WARNING

			"hvc: got unexpected close acknowledgement\n");

		return;

	}

	if (port >= VTTY_PORTS) {

		printk(KERN_WARNING

			"hvc: close message from invalid virtual device.\n");

		return;

	}

	/* For closes, just mark the console partition invalid */

	spin_lock_irqsave(&consolelock, flags);

	if (port_info[port].lp == event->xSourceLp)

		port_info[port].lp = HvLpIndexInvalid;

	spin_unlock_irqrestore(&consolelock, flags);

}

static void hvc_data_event(struct HvLpEvent *event)

{

	unsigned long flags;

	struct viocharlpevent *cevent = (struct viocharlpevent *)event;

	struct port_info *pi;

	int n;

	u8 port = cevent->virtual_device;

	if (port >= VTTY_PORTS) {

		printk(KERN_WARNING "hvc: data on invalid virtual device %d\n",

				port);

		return;

	}

	if (cevent->len == 0)

		return;

	/*

	 * Change 05/01/2003 - Ryan Arnold: If a partition other than

	 * the current exclusive partition tries to send us data

	 * events then just drop them on the floor because we don't

	 * want his stinking data.  He isn't authorized to receive

	 * data because he wasn't the first one to get the console,

	 * therefore he shouldn't be allowed to send data either.

	 * This will work without an iSeries fix.

	 */

	pi = &port_info[port];

	if (pi->lp != event->xSourceLp)

		return;

	spin_lock_irqsave(&consolelock, flags);

	n = IN_BUF_SIZE - pi->in_end;

	if (n > cevent->len)

		n = cevent->len;

	if (n > 0) {

		memcpy(&pi->in_buf[pi->in_end], cevent->data, n);

		pi->in_end += n;

	}

	spin_unlock_irqrestore(&consolelock, flags);

	if (n == 0)

		printk(KERN_WARNING "hvc: input buffer overflow\n");

}

static void hvc_ack_event(struct HvLpEvent *event)

{

	struct viocharlpevent *cevent = (struct viocharlpevent *)event;

	unsigned long flags;

	u8 port = cevent->virtual_device;

	if (port >= VTTY_PORTS) {

		printk(KERN_WARNING "hvc: data on invalid virtual device\n");

		return;

	}

	spin_lock_irqsave(&consolelock, flags);

	port_info[port].ack = event->xCorrelationToken;

	spin_unlock_irqrestore(&consolelock, flags);

}

static void hvc_config_event(struct HvLpEvent *event)

{

	struct viocharlpevent *cevent = (struct viocharlpevent *)event;

	if (cevent->data[0] == 0x01)

		printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n",

		       cevent->data[1], cevent->data[2],

		       cevent->data[3], cevent->data[4]);

	else

		printk(KERN_WARNING "hvc: unknown config event\n");

}

static void hvc_handle_event(struct HvLpEvent *event)

{

	int charminor;

	if (event == NULL)

		return;

	charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;

	switch (charminor) {

	case viocharopen:

		hvc_open_event(event);

		break;

	case viocharclose:

		hvc_close_event(event);

		break;

	case viochardata:

		hvc_data_event(event);

		break;

	case viocharack:

		hvc_ack_event(event);

		break;

	case viocharconfig:

		hvc_config_event(event);

		break;

	default:

		if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {

			event->xRc = HvLpEvent_Rc_InvalidSubtype;

			HvCallEvent_ackLpEvent(event);

		}

	}

}

static int __init send_open(HvLpIndex remoteLp, void *sem)

{

	return HvCallEvent_signalLpEventFast(remoteLp,

			HvLpEvent_Type_VirtualIo,

			viomajorsubtype_chario | viocharopen,

			HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,

			viopath_sourceinst(remoteLp),

			viopath_targetinst(remoteLp),

			(u64)(unsigned long)sem, VIOVERSION << 16,

			0, 0, 0, 0);

}

static int __init hvc_vio_init(void)

{

	atomic_t wait_flag;

	int rc;

	if (!firmware_has_feature(FW_FEATURE_ISERIES))

		return -EIO;

	/* +2 for fudge */

	rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),

			viomajorsubtype_chario, VIOCHAR_WINDOW + 2);

	if (rc)

		printk(KERN_WARNING "hvc: error opening to primary %d\n", rc);

	if (viopath_hostLp == HvLpIndexInvalid)

		vio_set_hostlp();

	/*

	 * And if the primary is not the same as the hosting LP, open to the

	 * hosting lp

	 */

	if ((viopath_hostLp != HvLpIndexInvalid) &&

	    (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) {

		printk(KERN_INFO "hvc: open path to hosting (%d)\n",

				viopath_hostLp);

		rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,

				VIOCHAR_WINDOW + 2);	/* +2 for fudge */

		if (rc)

			printk(KERN_WARNING

				"error opening to partition %d: %d\n",

				viopath_hostLp, rc);

	}

	if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0)

		printk(KERN_WARNING

			"hvc: error seting handler for console events!\n");

	/*

	 * First, try to open the console to the hosting lp.

	 * Wait on a semaphore for the response.

	 */

	atomic_set(&wait_flag, 0);

	if ((viopath_isactive(viopath_hostLp)) &&

	    (send_open(viopath_hostLp, &wait_flag) == 0)) {

		printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp);

		while (atomic_read(&wait_flag) == 0)

			mb();

		atomic_set(&wait_flag, 0);

	}

	/*

	 * If we don't have an active console, try the primary

	 */

	if ((!viopath_isactive(port_info[0].lp)) &&

	    (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) &&

	    (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) {

		printk(KERN_INFO "hvc: opening console to primary partition\n");

		while (atomic_read(&wait_flag) == 0)

			mb();

	}

	/* Register as a vio device to receive callbacks */

	rc = vio_register_driver(&hvc_vio_driver);

	return rc;

}

module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */

static void __exit hvc_vio_exit(void)

{

	vio_unregister_driver(&hvc_vio_driver);

}

module_exit(hvc_vio_exit);

/* the device tree order defines our numbering */

static int __init hvc_find_vtys(void)

{

	struct device_node *vty;

	int num_found = 0;

	for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;

			vty = of_find_node_by_name(vty, "vty")) {

		const uint32_t *vtermno;

		/* We have statically defined space for only a certain number

		 * of console adapters.

		 */

		if ((num_found >= MAX_NR_HVC_CONSOLES) ||

				(num_found >= VTTY_PORTS)) {

			of_node_put(vty);

			break;

		}

		vtermno = of_get_property(vty, "reg", NULL);

		if (!vtermno)

			continue;

		if (!of_device_is_compatible(vty, "IBM,iSeries-vty"))

			continue;

		if (num_found == 0)

			add_preferred_console("hvc", 0, NULL);

		hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);

		++num_found;

	}

	return num_found;

}

console_initcall(hvc_find_vtys);