[mirror_ubuntu-bionic-kernel.git] / drivers / tty / hvc / hvc_opal.c

/*
 * opal driver interface to hvc_console.c
 *
 * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
 *
 * 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
 *
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/export.h>
#include <linux/interrupt.h>

#include <asm/hvconsole.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/hvsi.h>
#include <asm/udbg.h>
#include <asm/opal.h>

#include "hvc_console.h"

static const char hvc_opal_name[] = "hvc_opal";

static const struct of_device_id hvc_opal_match[] = {
	{ .name = "serial", .compatible = "ibm,opal-console-raw" },
	{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
	{ },
};

typedef enum hv_protocol {
	HV_PROTOCOL_RAW,
	HV_PROTOCOL_HVSI
} hv_protocol_t;

struct hvc_opal_priv {
	hv_protocol_t		proto;	/* Raw data or HVSI packets */
	struct hvsi_priv	hvsi;	/* HVSI specific data */
};
static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];

/* For early boot console */
static struct hvc_opal_priv hvc_opal_boot_priv;
static u32 hvc_opal_boot_termno;

static const struct hv_ops hvc_opal_raw_ops = {
	.get_chars = opal_get_chars,
	.put_chars = opal_put_chars,
	.notifier_add = notifier_add_irq,
	.notifier_del = notifier_del_irq,
	.notifier_hangup = notifier_hangup_irq,
};

static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];

	if (WARN_ON(!pv))
		return -ENODEV;

	return hvsilib_get_chars(&pv->hvsi, buf, count);
}

static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];

	if (WARN_ON(!pv))
		return -ENODEV;

	return hvsilib_put_chars(&pv->hvsi, buf, count);
}

static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
	int rc;

	pr_devel("HVSI@%x: do open !\n", hp->vtermno);

	rc = notifier_add_irq(hp, data);
	if (rc)
		return rc;

	return hvsilib_open(&pv->hvsi, hp);
}

static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];

	pr_devel("HVSI@%x: do close !\n", hp->vtermno);

	hvsilib_close(&pv->hvsi, hp);

	notifier_del_irq(hp, data);
}

void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];

	pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);

	hvsilib_close(&pv->hvsi, hp);

	notifier_hangup_irq(hp, data);
}

static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];

	if (!pv)
		return -EINVAL;
	return pv->hvsi.mctrl;
}

static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
				unsigned int clear)
{
	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];

	pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
		 hp->vtermno, set, clear);

	if (set & TIOCM_DTR)
		hvsilib_write_mctrl(&pv->hvsi, 1);
	else if (clear & TIOCM_DTR)
		hvsilib_write_mctrl(&pv->hvsi, 0);

	return 0;
}

static const struct hv_ops hvc_opal_hvsi_ops = {
	.get_chars = hvc_opal_hvsi_get_chars,
	.put_chars = hvc_opal_hvsi_put_chars,
	.notifier_add = hvc_opal_hvsi_open,
	.notifier_del = hvc_opal_hvsi_close,
	.notifier_hangup = hvc_opal_hvsi_hangup,
	.tiocmget = hvc_opal_hvsi_tiocmget,
	.tiocmset = hvc_opal_hvsi_tiocmset,
};

static int hvc_opal_probe(struct platform_device *dev)
{
	const struct hv_ops *ops;
	struct hvc_struct *hp;
	struct hvc_opal_priv *pv;
	hv_protocol_t proto;
	unsigned int termno, irq, boot = 0;
	const __be32 *reg;

	if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
		proto = HV_PROTOCOL_RAW;
		ops = &hvc_opal_raw_ops;
	} else if (of_device_is_compatible(dev->dev.of_node,
					   "ibm,opal-console-hvsi")) {
		proto = HV_PROTOCOL_HVSI;
		ops = &hvc_opal_hvsi_ops;
	} else {
		pr_err("hvc_opal: Unknown protocol for %s\n",
		       dev->dev.of_node->full_name);
		return -ENXIO;
	}

	reg = of_get_property(dev->dev.of_node, "reg", NULL);
	termno = reg ? be32_to_cpup(reg) : 0;

	/* Is it our boot one ? */
	if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
		pv = hvc_opal_privs[termno];
		boot = 1;
	} else if (hvc_opal_privs[termno] == NULL) {
		pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
		if (!pv)
			return -ENOMEM;
		pv->proto = proto;
		hvc_opal_privs[termno] = pv;
		if (proto == HV_PROTOCOL_HVSI)
			hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
				     termno, 0);

		/* Instanciate now to establish a mapping index==vtermno */
		hvc_instantiate(termno, termno, ops);
	} else {
		pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
		       dev->dev.of_node->full_name, termno);
		return -ENXIO;
	}

	pr_info("hvc%d: %s protocol on %s%s\n", termno,
		proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
		dev->dev.of_node->full_name,
		boot ? " (boot console)" : "");

	irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
	if (!irq) {
		pr_err("hvc_opal: Unable to map interrupt for device %s\n",
			dev->dev.of_node->full_name);
		return irq;
	}

	hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
	if (IS_ERR(hp))
		return PTR_ERR(hp);
	dev_set_drvdata(&dev->dev, hp);

	return 0;
}

static int hvc_opal_remove(struct platform_device *dev)
{
	struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
	int rc, termno;

	termno = hp->vtermno;
	rc = hvc_remove(hp);
	if (rc == 0) {
		if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
			kfree(hvc_opal_privs[termno]);
		hvc_opal_privs[termno] = NULL;
	}
	return rc;
}

static struct platform_driver hvc_opal_driver = {
	.probe		= hvc_opal_probe,
	.remove		= hvc_opal_remove,
	.driver		= {
		.name	= hvc_opal_name,
		.of_match_table	= hvc_opal_match,
	}
};

static int __init hvc_opal_init(void)
{
	if (!firmware_has_feature(FW_FEATURE_OPAL))
		return -ENODEV;

	/* Register as a vio device to receive callbacks */
	return platform_driver_register(&hvc_opal_driver);
}
device_initcall(hvc_opal_init);

static void udbg_opal_putc(char c)
{
	unsigned int termno = hvc_opal_boot_termno;
	int count = -1;

	if (c == '\n')
		udbg_opal_putc('\r');

	do {
		switch(hvc_opal_boot_priv.proto) {
		case HV_PROTOCOL_RAW:
			count = opal_put_chars(termno, &c, 1);
			break;
		case HV_PROTOCOL_HVSI:
			count = hvc_opal_hvsi_put_chars(termno, &c, 1);
			break;
		}
	} while(count == 0 || count == -EAGAIN);
}

static int udbg_opal_getc_poll(void)
{
	unsigned int termno = hvc_opal_boot_termno;
	int rc = 0;
	char c;

	switch(hvc_opal_boot_priv.proto) {
	case HV_PROTOCOL_RAW:
		rc = opal_get_chars(termno, &c, 1);
		break;
	case HV_PROTOCOL_HVSI:
		rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
		break;
	}
	if (!rc)
		return -1;
	return c;
}

static int udbg_opal_getc(void)
{
	int ch;
	for (;;) {
		ch = udbg_opal_getc_poll();
		if (ch == -1) {
			/* This shouldn't be needed...but... */
			volatile unsigned long delay;
			for (delay=0; delay < 2000000; delay++)
				;
		} else {
			return ch;
		}
	}
}

static void udbg_init_opal_common(void)
{
	udbg_putc = udbg_opal_putc;
	udbg_getc = udbg_opal_getc;
	udbg_getc_poll = udbg_opal_getc_poll;
	tb_ticks_per_usec = 0x200; /* Make udelay not suck */
}

void __init hvc_opal_init_early(void)
{
	struct device_node *stdout_node = of_node_get(of_stdout);
	const __be32 *termno;
	const struct hv_ops *ops;
	u32 index;

	/* If the console wasn't in /chosen, try /ibm,opal */
	if (!stdout_node) {
		struct device_node *opal, *np;

		/* Current OPAL takeover doesn't provide the stdout
		 * path, so we hard wire it
		 */
		opal = of_find_node_by_path("/ibm,opal/consoles");
		if (opal)
			pr_devel("hvc_opal: Found consoles in new location\n");
		if (!opal) {
			opal = of_find_node_by_path("/ibm,opal");
			if (opal)
				pr_devel("hvc_opal: "
					 "Found consoles in old location\n");
		}
		if (!opal)
			return;
		for_each_child_of_node(opal, np) {
			if (!strcmp(np->name, "serial")) {
				stdout_node = np;
				break;
			}
		}
		of_node_put(opal);
	}
	if (!stdout_node)
		return;
	termno = of_get_property(stdout_node, "reg", NULL);
	index = termno ? be32_to_cpup(termno) : 0;
	if (index >= MAX_NR_HVC_CONSOLES)
		return;
	hvc_opal_privs[index] = &hvc_opal_boot_priv;

	/* Check the protocol */
	if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
		hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
		ops = &hvc_opal_raw_ops;
		pr_devel("hvc_opal: Found RAW console\n");
	}
	else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
		hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
		ops = &hvc_opal_hvsi_ops;
		hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
			     opal_put_chars, index, 1);
		/* HVSI, perform the handshake now */
		hvsilib_establish(&hvc_opal_boot_priv.hvsi);
		pr_devel("hvc_opal: Found HVSI console\n");
	} else
		goto out;
	hvc_opal_boot_termno = index;
	udbg_init_opal_common();
	add_preferred_console("hvc", index, NULL);
	hvc_instantiate(index, index, ops);
out:
	of_node_put(stdout_node);
}

#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
void __init udbg_init_debug_opal_raw(void)
{
	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
	hvc_opal_boot_termno = index;
	udbg_init_opal_common();
}
#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */

#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
void __init udbg_init_debug_opal_hvsi(void)
{
	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	hvc_opal_boot_termno = index;
	udbg_init_opal_common();
	hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
		     index, 1);
	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
}
#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */
Commit	Line	Data
daea1175 BH	1	/*
	2	* opal driver interface to hvc_console.c
	3	*
	4	* Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	#undef DEBUG
	23
	24	#include <linux/types.h>
	25	#include <linux/init.h>
	26	#include <linux/delay.h>
	27	#include <linux/slab.h>
	28	#include <linux/console.h>
	29	#include <linux/of.h>
	30	#include <linux/of_platform.h>
0084e475	31	#include <linux/export.h>
2def86a7	32	#include <linux/interrupt.h>
daea1175 BH	33
	34	#include <asm/hvconsole.h>
	35	#include <asm/prom.h>
	36	#include <asm/firmware.h>
	37	#include <asm/hvsi.h>
	38	#include <asm/udbg.h>
	39	#include <asm/opal.h>
	40
	41	#include "hvc_console.h"
	42
	43	static const char hvc_opal_name[] = "hvc_opal";
	44
37ff5252	45	static const struct of_device_id hvc_opal_match[] = {
daea1175 BH	46	{ .name = "serial", .compatible = "ibm,opal-console-raw" },
	47	{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
	48	{ },
	49	};
	50
	51	typedef enum hv_protocol {
	52	HV_PROTOCOL_RAW,
	53	HV_PROTOCOL_HVSI
	54	} hv_protocol_t;
	55
	56	struct hvc_opal_priv {
	57	hv_protocol_t proto; /* Raw data or HVSI packets */
	58	struct hvsi_priv hvsi; /* HVSI specific data */
	59	};
	60	static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
	61
	62	/* For early boot console */
	63	static struct hvc_opal_priv hvc_opal_boot_priv;
	64	static u32 hvc_opal_boot_termno;
	65
	66	static const struct hv_ops hvc_opal_raw_ops = {
	67	.get_chars = opal_get_chars,
	68	.put_chars = opal_put_chars,
	69	.notifier_add = notifier_add_irq,
	70	.notifier_del = notifier_del_irq,
	71	.notifier_hangup = notifier_hangup_irq,
	72	};
	73
	74	static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
	75	{
	76	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
	77
	78	if (WARN_ON(!pv))
	79	return -ENODEV;
	80
	81	return hvsilib_get_chars(&pv->hvsi, buf, count);
	82	}
	83
	84	static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
	85	{
	86	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
	87
	88	if (WARN_ON(!pv))
	89	return -ENODEV;
	90
	91	return hvsilib_put_chars(&pv->hvsi, buf, count);
	92	}
	93
	94	static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
	95	{
	96	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
	97	int rc;
	98
	99	pr_devel("HVSI@%x: do open !\n", hp->vtermno);
	100
	101	rc = notifier_add_irq(hp, data);
	102	if (rc)
	103	return rc;
	104
	105	return hvsilib_open(&pv->hvsi, hp);
	106	}
	107
	108	static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
	109	{
110	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
111
112	pr_devel("HVSI@%x: do close !\n", hp->vtermno);
113
114	hvsilib_close(&pv->hvsi, hp);
115
116	notifier_del_irq(hp, data);
117	}
118
119	void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
120	{
121	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
122
123	pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
124
125	hvsilib_close(&pv->hvsi, hp);
126
127	notifier_hangup_irq(hp, data);
128	}
129
130	static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
131	{
132	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
133
134	if (!pv)
135	return -EINVAL;
136	return pv->hvsi.mctrl;
137	}
138
139	static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
140	unsigned int clear)
141	{
142	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
143
144	pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
145	hp->vtermno, set, clear);
146
147	if (set & TIOCM_DTR)
148	hvsilib_write_mctrl(&pv->hvsi, 1);
149	else if (clear & TIOCM_DTR)
150	hvsilib_write_mctrl(&pv->hvsi, 0);
151
152	return 0;
153	}
154
155	static const struct hv_ops hvc_opal_hvsi_ops = {
156	.get_chars = hvc_opal_hvsi_get_chars,
157	.put_chars = hvc_opal_hvsi_put_chars,
158	.notifier_add = hvc_opal_hvsi_open,
159	.notifier_del = hvc_opal_hvsi_close,
160	.notifier_hangup = hvc_opal_hvsi_hangup,
161	.tiocmget = hvc_opal_hvsi_tiocmget,
162	.tiocmset = hvc_opal_hvsi_tiocmset,
163	};
164
9671f099	165	static int hvc_opal_probe(struct platform_device *dev)
daea1175 BH	166	{
	167	const struct hv_ops *ops;
	168	struct hvc_struct *hp;
	169	struct hvc_opal_priv *pv;
	170	hv_protocol_t proto;
2def86a7	171	unsigned int termno, irq, boot = 0;
daea1175 BH	172	const __be32 *reg;
	173
	174	if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
	175	proto = HV_PROTOCOL_RAW;
	176	ops = &hvc_opal_raw_ops;
	177	} else if (of_device_is_compatible(dev->dev.of_node,
	178	"ibm,opal-console-hvsi")) {
	179	proto = HV_PROTOCOL_HVSI;
	180	ops = &hvc_opal_hvsi_ops;
	181	} else {
46e99c4a	182	pr_err("hvc_opal: Unknown protocol for %s\n",
daea1175 BH	183	dev->dev.of_node->full_name);
	184	return -ENXIO;
	185	}
	186
	187	reg = of_get_property(dev->dev.of_node, "reg", NULL);
	188	termno = reg ? be32_to_cpup(reg) : 0;
	189
	190	/* Is it our boot one ? */
	191	if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
	192	pv = hvc_opal_privs[termno];
	193	boot = 1;
	194	} else if (hvc_opal_privs[termno] == NULL) {
	195	pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
	196	if (!pv)
	197	return -ENOMEM;
	198	pv->proto = proto;
	199	hvc_opal_privs[termno] = pv;
	200	if (proto == HV_PROTOCOL_HVSI)
	201	hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
	202	termno, 0);
	203
	204	/* Instanciate now to establish a mapping index==vtermno */
	205	hvc_instantiate(termno, termno, ops);
	206	} else {
	207	pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
	208	dev->dev.of_node->full_name, termno);
	209	return -ENXIO;
	210	}
	211
	212	pr_info("hvc%d: %s protocol on %s%s\n", termno,
	213	proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
	214	dev->dev.of_node->full_name,
	215	boot ? " (boot console)" : "");
	216
2def86a7 AP	217	irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
	218	if (!irq) {
	219	pr_err("hvc_opal: Unable to map interrupt for device %s\n",
	220	dev->dev.of_node->full_name);
	221	return irq;
	222	}
	223
	224	hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
daea1175 BH	225	if (IS_ERR(hp))
	226	return PTR_ERR(hp);
	227	dev_set_drvdata(&dev->dev, hp);
	228
	229	return 0;
	230	}
	231
ae8d8a14	232	static int hvc_opal_remove(struct platform_device *dev)
daea1175 BH	233	{
	234	struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
	235	int rc, termno;
	236
	237	termno = hp->vtermno;
	238	rc = hvc_remove(hp);
	239	if (rc == 0) {
	240	if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
	241	kfree(hvc_opal_privs[termno]);
	242	hvc_opal_privs[termno] = NULL;
	243	}
	244	return rc;
	245	}
	246
	247	static struct platform_driver hvc_opal_driver = {
	248	.probe = hvc_opal_probe,
91116cba	249	.remove = hvc_opal_remove,
daea1175 BH	250	.driver = {
daea1175 BH	251	.name = hvc_opal_name,
daea1175 BH	252	.of_match_table = hvc_opal_match,
	253	}
	254	};
	255
	256	static int __init hvc_opal_init(void)
	257	{
	258	if (!firmware_has_feature(FW_FEATURE_OPAL))
	259	return -ENODEV;
	260
	261	/* Register as a vio device to receive callbacks */
	262	return platform_driver_register(&hvc_opal_driver);
	263	}
4fedd0bf	264	device_initcall(hvc_opal_init);
daea1175 BH	265
	266	static void udbg_opal_putc(char c)
	267	{
	268	unsigned int termno = hvc_opal_boot_termno;
	269	int count = -1;
	270
	271	if (c == '\n')
	272	udbg_opal_putc('\r');
	273
	274	do {
	275	switch(hvc_opal_boot_priv.proto) {
	276	case HV_PROTOCOL_RAW:
	277	count = opal_put_chars(termno, &c, 1);
	278	break;
	279	case HV_PROTOCOL_HVSI:
	280	count = hvc_opal_hvsi_put_chars(termno, &c, 1);
	281	break;
	282	}
	283	} while(count == 0 \|\| count == -EAGAIN);
	284	}
	285
	286	static int udbg_opal_getc_poll(void)
	287	{
	288	unsigned int termno = hvc_opal_boot_termno;
	289	int rc = 0;
	290	char c;
	291
	292	switch(hvc_opal_boot_priv.proto) {
	293	case HV_PROTOCOL_RAW:
	294	rc = opal_get_chars(termno, &c, 1);
	295	break;
	296	case HV_PROTOCOL_HVSI:
	297	rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
	298	break;
	299	}
	300	if (!rc)
	301	return -1;
	302	return c;
	303	}
	304
	305	static int udbg_opal_getc(void)
	306	{
	307	int ch;
	308	for (;;) {
	309	ch = udbg_opal_getc_poll();
	310	if (ch == -1) {
	311	/* This shouldn't be needed...but... */
	312	volatile unsigned long delay;
	313	for (delay=0; delay < 2000000; delay++)
	314	;
	315	} else {
	316	return ch;
	317	}
	318	}
	319	}
	320
	321	static void udbg_init_opal_common(void)
	322	{
	323	udbg_putc = udbg_opal_putc;
	324	udbg_getc = udbg_opal_getc;
	325	udbg_getc_poll = udbg_opal_getc_poll;
	326	tb_ticks_per_usec = 0x200; /* Make udelay not suck */
	327	}
	328
329	void __init hvc_opal_init_early(void)
330	{
a752ee56	331	struct device_node *stdout_node = of_node_get(of_stdout);
5c94913c	332	const __be32 *termno;
daea1175 BH	333	const struct hv_ops *ops;
	334	u32 index;
	335
a752ee56 GL	336	/* If the console wasn't in /chosen, try /ibm,opal */
a752ee56 GL	337	if (!stdout_node) {
daea1175 BH	338	struct device_node opal, np;
	339
	340	/* Current OPAL takeover doesn't provide the stdout
	341	* path, so we hard wire it
	342	*/
	343	opal = of_find_node_by_path("/ibm,opal/consoles");
	344	if (opal)
	345	pr_devel("hvc_opal: Found consoles in new location\n");
	346	if (!opal) {
	347	opal = of_find_node_by_path("/ibm,opal");
	348	if (opal)
	349	pr_devel("hvc_opal: "
	350	"Found consoles in old location\n");
	351	}
	352	if (!opal)
	353	return;
	354	for_each_child_of_node(opal, np) {
	355	if (!strcmp(np->name, "serial")) {
	356	stdout_node = np;
	357	break;
	358	}
	359	}
	360	of_node_put(opal);
	361	}
	362	if (!stdout_node)
	363	return;
	364	termno = of_get_property(stdout_node, "reg", NULL);
5c94913c	365	index = termno ? be32_to_cpup(termno) : 0;
daea1175 BH	366	if (index >= MAX_NR_HVC_CONSOLES)
	367	return;
	368	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	369
	370	/* Check the protocol */
	371	if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
	372	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
	373	ops = &hvc_opal_raw_ops;
	374	pr_devel("hvc_opal: Found RAW console\n");
	375	}
	376	else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
	377	hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
	378	ops = &hvc_opal_hvsi_ops;
	379	hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
	380	opal_put_chars, index, 1);
	381	/* HVSI, perform the handshake now */
	382	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
	383	pr_devel("hvc_opal: Found HVSI console\n");
	384	} else
	385	goto out;
	386	hvc_opal_boot_termno = index;
	387	udbg_init_opal_common();
	388	add_preferred_console("hvc", index, NULL);
	389	hvc_instantiate(index, index, ops);
	390	out:
	391	of_node_put(stdout_node);
	392	}
	393
	394	#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
50fb31cf	395	void __init udbg_init_debug_opal_raw(void)
daea1175 BH	396	{
	397	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	398	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	399	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
	400	hvc_opal_boot_termno = index;
	401	udbg_init_opal_common();
	402	}
	403	#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
	404
	405	#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
	406	void __init udbg_init_debug_opal_hvsi(void)
	407	{
	408	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	409	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	410	hvc_opal_boot_termno = index;
	411	udbg_init_opal_common();
	412	hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
	413	index, 1);
	414	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
	415	}
	416	#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */