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

// SPDX-License-Identifier: GPL-2.0+
/*
 * opal driver interface to hvc_console.c
 *
 * Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
 */

#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 %pOF\n",
		       dev->dev.of_node);
		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 %pOF has duplicate terminal number #%d\n",
		       dev->dev.of_node, termno);
		return -ENXIO;
	}

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

	irq = irq_of_parse_and_map(dev->dev.of_node, 0);
	if (!irq) {
		pr_info("hvc%d: No interrupts property, using OPAL event\n",
				termno);
		irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
	}

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

	hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
	if (IS_ERR(hp))
		return PTR_ERR(hp);

	/* hvc consoles on powernv may need to share a single irq */
	hp->flags = IRQF_SHARED;
	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;
}

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
e3b3d0f5	1	// SPDX-License-Identifier: GPL-2.0+
daea1175 BH	2	/*
	3	* opal driver interface to hvc_console.c
	4	*
	5	* Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
daea1175 BH	6	*/
	7
	8	#undef DEBUG
	9
	10	#include <linux/types.h>
	11	#include <linux/init.h>
	12	#include <linux/delay.h>
	13	#include <linux/slab.h>
	14	#include <linux/console.h>
	15	#include <linux/of.h>
	16	#include <linux/of_platform.h>
0084e475	17	#include <linux/export.h>
2def86a7	18	#include <linux/interrupt.h>
daea1175 BH	19
	20	#include <asm/hvconsole.h>
	21	#include <asm/prom.h>
	22	#include <asm/firmware.h>
	23	#include <asm/hvsi.h>
	24	#include <asm/udbg.h>
	25	#include <asm/opal.h>
	26
	27	#include "hvc_console.h"
	28
	29	static const char hvc_opal_name[] = "hvc_opal";
	30
37ff5252	31	static const struct of_device_id hvc_opal_match[] = {
daea1175 BH	32	{ .name = "serial", .compatible = "ibm,opal-console-raw" },
	33	{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
	34	{ },
	35	};
	36
	37	typedef enum hv_protocol {
	38	HV_PROTOCOL_RAW,
	39	HV_PROTOCOL_HVSI
	40	} hv_protocol_t;
	41
	42	struct hvc_opal_priv {
	43	hv_protocol_t proto; /* Raw data or HVSI packets */
	44	struct hvsi_priv hvsi; /* HVSI specific data */
	45	};
	46	static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
	47
	48	/* For early boot console */
	49	static struct hvc_opal_priv hvc_opal_boot_priv;
	50	static u32 hvc_opal_boot_termno;
	51
	52	static const struct hv_ops hvc_opal_raw_ops = {
	53	.get_chars = opal_get_chars,
	54	.put_chars = opal_put_chars,
	55	.notifier_add = notifier_add_irq,
	56	.notifier_del = notifier_del_irq,
	57	.notifier_hangup = notifier_hangup_irq,
	58	};
	59
	60	static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
	61	{
	62	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
	63
	64	if (WARN_ON(!pv))
	65	return -ENODEV;
	66
	67	return hvsilib_get_chars(&pv->hvsi, buf, count);
	68	}
	69
	70	static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
	71	{
	72	struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
	73
	74	if (WARN_ON(!pv))
	75	return -ENODEV;
	76
	77	return hvsilib_put_chars(&pv->hvsi, buf, count);
	78	}
	79
	80	static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
	81	{
	82	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
	83	int rc;
	84
	85	pr_devel("HVSI@%x: do open !\n", hp->vtermno);
	86
	87	rc = notifier_add_irq(hp, data);
	88	if (rc)
	89	return rc;
	90
	91	return hvsilib_open(&pv->hvsi, hp);
	92	}
	93
	94	static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
	95	{
96	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
97
98	pr_devel("HVSI@%x: do close !\n", hp->vtermno);
99
100	hvsilib_close(&pv->hvsi, hp);
101
102	notifier_del_irq(hp, data);
103	}
104
105	void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
106	{
107	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
108
109	pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
110
111	hvsilib_close(&pv->hvsi, hp);
112
113	notifier_hangup_irq(hp, data);
114	}
115
116	static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
117	{
118	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
119
120	if (!pv)
121	return -EINVAL;
122	return pv->hvsi.mctrl;
123	}
124
125	static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
126	unsigned int clear)
127	{
128	struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
129
130	pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
131	hp->vtermno, set, clear);
132
133	if (set & TIOCM_DTR)
134	hvsilib_write_mctrl(&pv->hvsi, 1);
135	else if (clear & TIOCM_DTR)
136	hvsilib_write_mctrl(&pv->hvsi, 0);
137
138	return 0;
139	}
140
141	static const struct hv_ops hvc_opal_hvsi_ops = {
142	.get_chars = hvc_opal_hvsi_get_chars,
143	.put_chars = hvc_opal_hvsi_put_chars,
144	.notifier_add = hvc_opal_hvsi_open,
145	.notifier_del = hvc_opal_hvsi_close,
146	.notifier_hangup = hvc_opal_hvsi_hangup,
147	.tiocmget = hvc_opal_hvsi_tiocmget,
148	.tiocmset = hvc_opal_hvsi_tiocmset,
149	};
150
9671f099	151	static int hvc_opal_probe(struct platform_device *dev)
daea1175 BH	152	{
	153	const struct hv_ops *ops;
	154	struct hvc_struct *hp;
	155	struct hvc_opal_priv *pv;
	156	hv_protocol_t proto;
2def86a7	157	unsigned int termno, irq, boot = 0;
daea1175 BH	158	const __be32 *reg;
	159
	160	if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
	161	proto = HV_PROTOCOL_RAW;
	162	ops = &hvc_opal_raw_ops;
	163	} else if (of_device_is_compatible(dev->dev.of_node,
	164	"ibm,opal-console-hvsi")) {
	165	proto = HV_PROTOCOL_HVSI;
	166	ops = &hvc_opal_hvsi_ops;
	167	} else {
a73ee843 RH	168	pr_err("hvc_opal: Unknown protocol for %pOF\n",
a73ee843 RH	169	dev->dev.of_node);
daea1175 BH	170	return -ENXIO;
	171	}
	172
	173	reg = of_get_property(dev->dev.of_node, "reg", NULL);
	174	termno = reg ? be32_to_cpup(reg) : 0;
	175
	176	/* Is it our boot one ? */
	177	if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
	178	pv = hvc_opal_privs[termno];
	179	boot = 1;
	180	} else if (hvc_opal_privs[termno] == NULL) {
	181	pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
	182	if (!pv)
	183	return -ENOMEM;
	184	pv->proto = proto;
	185	hvc_opal_privs[termno] = pv;
	186	if (proto == HV_PROTOCOL_HVSI)
	187	hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
	188	termno, 0);
	189
	190	/* Instanciate now to establish a mapping index==vtermno */
	191	hvc_instantiate(termno, termno, ops);
	192	} else {
a73ee843 RH	193	pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
a73ee843 RH	194	dev->dev.of_node, termno);
daea1175 BH	195	return -ENXIO;
	196	}
	197
a73ee843	198	pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
daea1175	199	proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
a73ee843	200	dev->dev.of_node,
daea1175 BH	201	boot ? " (boot console)" : "");
daea1175 BH	202
00dab818 SMJ	203	irq = irq_of_parse_and_map(dev->dev.of_node, 0);
	204	if (!irq) {
	205	pr_info("hvc%d: No interrupts property, using OPAL event\n",
	206	termno);
	207	irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
	208	}
	209
2def86a7	210	if (!irq) {
a73ee843 RH	211	pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
a73ee843 RH	212	dev->dev.of_node);
2def86a7 AP	213	return irq;
	214	}
	215
	216	hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
daea1175 BH	217	if (IS_ERR(hp))
daea1175 BH	218	return PTR_ERR(hp);
bbc3dfe8 SMJ	219
	220	/* hvc consoles on powernv may need to share a single irq */
	221	hp->flags = IRQF_SHARED;
daea1175 BH	222	dev_set_drvdata(&dev->dev, hp);
	223
	224	return 0;
	225	}
	226
ae8d8a14	227	static int hvc_opal_remove(struct platform_device *dev)
daea1175 BH	228	{
	229	struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
	230	int rc, termno;
	231
	232	termno = hp->vtermno;
	233	rc = hvc_remove(hp);
	234	if (rc == 0) {
	235	if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
	236	kfree(hvc_opal_privs[termno]);
	237	hvc_opal_privs[termno] = NULL;
	238	}
	239	return rc;
	240	}
	241
	242	static struct platform_driver hvc_opal_driver = {
	243	.probe = hvc_opal_probe,
91116cba	244	.remove = hvc_opal_remove,
daea1175 BH	245	.driver = {
daea1175 BH	246	.name = hvc_opal_name,
daea1175 BH	247	.of_match_table = hvc_opal_match,
	248	}
	249	};
	250
	251	static int __init hvc_opal_init(void)
	252	{
	253	if (!firmware_has_feature(FW_FEATURE_OPAL))
	254	return -ENODEV;
	255
	256	/* Register as a vio device to receive callbacks */
	257	return platform_driver_register(&hvc_opal_driver);
	258	}
4fedd0bf	259	device_initcall(hvc_opal_init);
daea1175 BH	260
	261	static void udbg_opal_putc(char c)
	262	{
	263	unsigned int termno = hvc_opal_boot_termno;
	264	int count = -1;
	265
	266	if (c == '\n')
	267	udbg_opal_putc('\r');
	268
	269	do {
	270	switch(hvc_opal_boot_priv.proto) {
	271	case HV_PROTOCOL_RAW:
	272	count = opal_put_chars(termno, &c, 1);
	273	break;
	274	case HV_PROTOCOL_HVSI:
	275	count = hvc_opal_hvsi_put_chars(termno, &c, 1);
	276	break;
	277	}
	278	} while(count == 0 \|\| count == -EAGAIN);
	279	}
	280
	281	static int udbg_opal_getc_poll(void)
	282	{
	283	unsigned int termno = hvc_opal_boot_termno;
	284	int rc = 0;
	285	char c;
	286
	287	switch(hvc_opal_boot_priv.proto) {
	288	case HV_PROTOCOL_RAW:
	289	rc = opal_get_chars(termno, &c, 1);
	290	break;
	291	case HV_PROTOCOL_HVSI:
	292	rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
	293	break;
	294	}
	295	if (!rc)
	296	return -1;
	297	return c;
	298	}
	299
	300	static int udbg_opal_getc(void)
	301	{
	302	int ch;
	303	for (;;) {
	304	ch = udbg_opal_getc_poll();
	305	if (ch == -1) {
	306	/* This shouldn't be needed...but... */
	307	volatile unsigned long delay;
	308	for (delay=0; delay < 2000000; delay++)
	309	;
	310	} else {
	311	return ch;
	312	}
	313	}
	314	}
	315
	316	static void udbg_init_opal_common(void)
	317	{
	318	udbg_putc = udbg_opal_putc;
	319	udbg_getc = udbg_opal_getc;
	320	udbg_getc_poll = udbg_opal_getc_poll;
daea1175 BH	321	}
	322
	323	void __init hvc_opal_init_early(void)
	324	{
a752ee56	325	struct device_node *stdout_node = of_node_get(of_stdout);
5c94913c	326	const __be32 *termno;
daea1175 BH	327	const struct hv_ops *ops;
	328	u32 index;
	329
a752ee56 GL	330	/* If the console wasn't in /chosen, try /ibm,opal */
a752ee56 GL	331	if (!stdout_node) {
daea1175 BH	332	struct device_node opal, np;
	333
	334	/* Current OPAL takeover doesn't provide the stdout
	335	* path, so we hard wire it
	336	*/
	337	opal = of_find_node_by_path("/ibm,opal/consoles");
	338	if (opal)
	339	pr_devel("hvc_opal: Found consoles in new location\n");
	340	if (!opal) {
	341	opal = of_find_node_by_path("/ibm,opal");
	342	if (opal)
	343	pr_devel("hvc_opal: "
	344	"Found consoles in old location\n");
	345	}
	346	if (!opal)
	347	return;
	348	for_each_child_of_node(opal, np) {
	349	if (!strcmp(np->name, "serial")) {
	350	stdout_node = np;
	351	break;
	352	}
	353	}
	354	of_node_put(opal);
	355	}
	356	if (!stdout_node)
	357	return;
	358	termno = of_get_property(stdout_node, "reg", NULL);
5c94913c	359	index = termno ? be32_to_cpup(termno) : 0;
daea1175 BH	360	if (index >= MAX_NR_HVC_CONSOLES)
	361	return;
	362	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	363
	364	/* Check the protocol */
	365	if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
	366	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
	367	ops = &hvc_opal_raw_ops;
	368	pr_devel("hvc_opal: Found RAW console\n");
	369	}
	370	else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
	371	hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
	372	ops = &hvc_opal_hvsi_ops;
	373	hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
	374	opal_put_chars, index, 1);
	375	/* HVSI, perform the handshake now */
	376	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
	377	pr_devel("hvc_opal: Found HVSI console\n");
	378	} else
	379	goto out;
	380	hvc_opal_boot_termno = index;
	381	udbg_init_opal_common();
	382	add_preferred_console("hvc", index, NULL);
	383	hvc_instantiate(index, index, ops);
	384	out:
	385	of_node_put(stdout_node);
	386	}
	387
	388	#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
50fb31cf	389	void __init udbg_init_debug_opal_raw(void)
daea1175 BH	390	{
	391	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	392	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	393	hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
	394	hvc_opal_boot_termno = index;
	395	udbg_init_opal_common();
	396	}
	397	#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
	398
	399	#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
	400	void __init udbg_init_debug_opal_hvsi(void)
	401	{
	402	u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
	403	hvc_opal_privs[index] = &hvc_opal_boot_priv;
	404	hvc_opal_boot_termno = index;
	405	udbg_init_opal_common();
	406	hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
	407	index, 1);
	408	hvsilib_establish(&hvc_opal_boot_priv.hvsi);
	409	}
	410	#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */