[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / platforms / powernv / opal.c

/*
 * PowerNV OPAL high level interfaces
 *
 * Copyright 2011 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.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <asm/opal.h>
#include <asm/firmware.h>

#include "powernv.h"

struct opal {
	u64 base;
	u64 entry;
} opal;

static struct device_node *opal_node;
static DEFINE_SPINLOCK(opal_write_lock);
extern u64 opal_mc_secondary_handler[];
static unsigned int *opal_irqs;
static unsigned int opal_irq_count;

int __init early_init_dt_scan_opal(unsigned long node,
				   const char *uname, int depth, void *data)
{
	const void *basep, *entryp;
	unsigned long basesz, entrysz;

	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
		return 0;

	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);

	if (!basep || !entryp)
		return 1;

	opal.base = of_read_number(basep, basesz/4);
	opal.entry = of_read_number(entryp, entrysz/4);

	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%ld)\n",
		 opal.base, basep, basesz);
	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
		 opal.entry, entryp, entrysz);

	powerpc_firmware_features |= FW_FEATURE_OPAL;
	if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		powerpc_firmware_features |= FW_FEATURE_OPALv3;
		printk("OPAL V3 detected !\n");
	} else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		printk("OPAL V2 detected !\n");
	} else {
		printk("OPAL V1 detected !\n");
	}

	return 1;
}

static int __init opal_register_exception_handlers(void)
{
	u64 glue;

	if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
		return -ENODEV;

	/* Hookup some exception handlers. We use the fwnmi area at 0x7000
	 * to provide the glue space to OPAL
	 */
	glue = 0x7000;
	opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
					__pa(opal_mc_secondary_handler[0]),
					glue);
	glue += 128;
	opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
					0, glue);
	glue += 128;
	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);

	return 0;
}

early_initcall(opal_register_exception_handlers);

int opal_get_chars(uint32_t vtermno, char *buf, int count)
{
	s64 len, rc;
	u64 evt;

	if (!opal.entry)
		return -ENODEV;
	opal_poll_events(&evt);
	if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
		return 0;
	len = count;
	rc = opal_console_read(vtermno, &len, buf);
	if (rc == OPAL_SUCCESS)
		return len;
	return 0;
}

int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
{
	int written = 0;
	s64 len, rc;
	unsigned long flags;
	u64 evt;

	if (!opal.entry)
		return -ENODEV;

	/* We want put_chars to be atomic to avoid mangling of hvsi
	 * packets. To do that, we first test for room and return
	 * -EAGAIN if there isn't enough.
	 *
	 * Unfortunately, opal_console_write_buffer_space() doesn't
	 * appear to work on opal v1, so we just assume there is
	 * enough room and be done with it
	 */
	spin_lock_irqsave(&opal_write_lock, flags);
	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
		rc = opal_console_write_buffer_space(vtermno, &len);
		if (rc || len < total_len) {
			spin_unlock_irqrestore(&opal_write_lock, flags);
			/* Closed -> drop characters */
			if (rc)
				return total_len;
			opal_poll_events(&evt);
			return -EAGAIN;
		}
	}

	/* We still try to handle partial completions, though they
	 * should no longer happen.
	 */
	rc = OPAL_BUSY;
	while(total_len > 0 && (rc == OPAL_BUSY ||
				rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
		len = total_len;
		rc = opal_console_write(vtermno, &len, data);

		/* Closed or other error drop */
		if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
		    rc != OPAL_BUSY_EVENT) {
			written = total_len;
			break;
		}
		if (rc == OPAL_SUCCESS) {
			total_len -= len;
			data += len;
			written += len;
		}
		/* This is a bit nasty but we need that for the console to
		 * flush when there aren't any interrupts. We will clean
		 * things a bit later to limit that to synchronous path
		 * such as the kernel console and xmon/udbg
		 */
		do
			opal_poll_events(&evt);
		while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
	}
	spin_unlock_irqrestore(&opal_write_lock, flags);
	return written;
}

int opal_machine_check(struct pt_regs *regs)
{
	struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
	struct opal_machine_check_event evt;
	const char *level, *sevstr, *subtype;
	static const char *opal_mc_ue_types[] = {
		"Indeterminate",
		"Instruction fetch",
		"Page table walk ifetch",
		"Load/Store",
		"Page table walk Load/Store",
	};
	static const char *opal_mc_slb_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};
	static const char *opal_mc_erat_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};
	static const char *opal_mc_tlb_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};

	/* Copy the event structure and release the original */
	evt = *opal_evt;
	opal_evt->in_use = 0;

	/* Print things out */
	if (evt.version != OpalMCE_V1) {
		pr_err("Machine Check Exception, Unknown event version %d !\n",
		       evt.version);
		return 0;
	}
	switch(evt.severity) {
	case OpalMCE_SEV_NO_ERROR:
		level = KERN_INFO;
		sevstr = "Harmless";
		break;
	case OpalMCE_SEV_WARNING:
		level = KERN_WARNING;
		sevstr = "";
		break;
	case OpalMCE_SEV_ERROR_SYNC:
		level = KERN_ERR;
		sevstr = "Severe";
		break;
	case OpalMCE_SEV_FATAL:
	default:
		level = KERN_ERR;
		sevstr = "Fatal";
		break;
	}

	printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
	       evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
	       "Recovered" : "[Not recovered");
	printk("%s  Initiator: %s\n", level,
	       evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
	switch(evt.error_type) {
	case OpalMCE_ERROR_TYPE_UE:
		subtype = evt.u.ue_error.ue_error_type <
			ARRAY_SIZE(opal_mc_ue_types) ?
			opal_mc_ue_types[evt.u.ue_error.ue_error_type]
			: "Unknown";
		printk("%s  Error type: UE [%s]\n", level, subtype);
		if (evt.u.ue_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.ue_error.effective_address);
		if (evt.u.ue_error.physical_address_provided)
			printk("%s      Physial address: %016llx\n",
			       level, evt.u.ue_error.physical_address);
		break;
	case OpalMCE_ERROR_TYPE_SLB:
		subtype = evt.u.slb_error.slb_error_type <
			ARRAY_SIZE(opal_mc_slb_types) ?
			opal_mc_slb_types[evt.u.slb_error.slb_error_type]
			: "Unknown";
		printk("%s  Error type: SLB [%s]\n", level, subtype);
		if (evt.u.slb_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.slb_error.effective_address);
		break;
	case OpalMCE_ERROR_TYPE_ERAT:
		subtype = evt.u.erat_error.erat_error_type <
			ARRAY_SIZE(opal_mc_erat_types) ?
			opal_mc_erat_types[evt.u.erat_error.erat_error_type]
			: "Unknown";
		printk("%s  Error type: ERAT [%s]\n", level, subtype);
		if (evt.u.erat_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.erat_error.effective_address);
		break;
	case OpalMCE_ERROR_TYPE_TLB:
		subtype = evt.u.tlb_error.tlb_error_type <
			ARRAY_SIZE(opal_mc_tlb_types) ?
			opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
			: "Unknown";
		printk("%s  Error type: TLB [%s]\n", level, subtype);
		if (evt.u.tlb_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.tlb_error.effective_address);
		break;
	default:
	case OpalMCE_ERROR_TYPE_UNKNOWN:
		printk("%s  Error type: Unknown\n", level);
		break;
	}
	return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
}

static irqreturn_t opal_interrupt(int irq, void *data)
{
	uint64_t events;

	opal_handle_interrupt(virq_to_hw(irq), &events);

	/* XXX TODO: Do something with the events */

	return IRQ_HANDLED;
}

static int __init opal_init(void)
{
	struct device_node *np, *consoles;
	const u32 *irqs;
	int rc, i, irqlen;

	opal_node = of_find_node_by_path("/ibm,opal");
	if (!opal_node) {
		pr_warn("opal: Node not found\n");
		return -ENODEV;
	}
	if (firmware_has_feature(FW_FEATURE_OPALv2))
		consoles = of_find_node_by_path("/ibm,opal/consoles");
	else
		consoles = of_node_get(opal_node);

	/* Register serial ports */
	for_each_child_of_node(consoles, np) {
		if (strcmp(np->name, "serial"))
			continue;
		of_platform_device_create(np, NULL, NULL);
	}
	of_node_put(consoles);

	/* Find all OPAL interrupts and request them */
	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
		 irqs ? (irqlen / 4) : 0);
	opal_irq_count = irqlen / 4;
	opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
		unsigned int hwirq = be32_to_cpup(irqs);
		unsigned int irq = irq_create_mapping(NULL, hwirq);
		if (irq == NO_IRQ) {
			pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
			continue;
		}
		rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
		if (rc)
			pr_warning("opal: Error %d requesting irq %d"
				   " (0x%x)\n", rc, irq, hwirq);
		opal_irqs[i] = irq;
	}
	return 0;
}
subsys_initcall(opal_init);

void opal_shutdown(void)
{
	unsigned int i;

	for (i = 0; i < opal_irq_count; i++) {
		if (opal_irqs[i])
			free_irq(opal_irqs[i], 0);
		opal_irqs[i] = 0;
	}
}
Commit	Line	Data
14a43e69 BH	1	/*
	2	* PowerNV OPAL high level interfaces
	3	*
	4	* Copyright 2011 IBM Corp.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#undef DEBUG
	13
	14	#include <linux/types.h>
	15	#include <linux/of.h>
	16	#include <linux/of_platform.h>
a125e092	17	#include <linux/interrupt.h>
73ed148a	18	#include <linux/slab.h>
14a43e69 BH	19	#include <asm/opal.h>
	20	#include <asm/firmware.h>
	21
	22	#include "powernv.h"
	23
	24	struct opal {
	25	u64 base;
	26	u64 entry;
	27	} opal;
	28
	29	static struct device_node *opal_node;
	30	static DEFINE_SPINLOCK(opal_write_lock);
ed79ba9e	31	extern u64 opal_mc_secondary_handler[];
73ed148a BH	32	static unsigned int *opal_irqs;
73ed148a BH	33	static unsigned int opal_irq_count;
14a43e69 BH	34
	35	int __init early_init_dt_scan_opal(unsigned long node,
	36	const char uname, int depth, void data)
	37	{
	38	const void basep, entryp;
	39	unsigned long basesz, entrysz;
	40
	41	if (depth != 1 \|\| strcmp(uname, "ibm,opal") != 0)
	42	return 0;
	43
	44	basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	45	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
	46
	47	if (!basep \|\| !entryp)
	48	return 1;
	49
	50	opal.base = of_read_number(basep, basesz/4);
	51	opal.entry = of_read_number(entryp, entrysz/4);
	52
	53	pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n",
	54	opal.base, basep, basesz);
	55	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
	56	opal.entry, entryp, entrysz);
	57
	58	powerpc_firmware_features \|= FW_FEATURE_OPAL;
75b93da4 BH	59	if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
	60	powerpc_firmware_features \|= FW_FEATURE_OPALv2;
	61	powerpc_firmware_features \|= FW_FEATURE_OPALv3;
	62	printk("OPAL V3 detected !\n");
	63	} else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
14a43e69 BH	64	powerpc_firmware_features \|= FW_FEATURE_OPALv2;
	65	printk("OPAL V2 detected !\n");
	66	} else {
	67	printk("OPAL V1 detected !\n");
	68	}
	69
c4463b37 JK	70	return 1;
	71	}
	72
	73	static int __init opal_register_exception_handlers(void)
	74	{
	75	u64 glue;
	76
	77	if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
	78	return -ENODEV;
	79
ed79ba9e BH	80	/* Hookup some exception handlers. We use the fwnmi area at 0x7000
	81	* to provide the glue space to OPAL
	82	*/
	83	glue = 0x7000;
	84	opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
	85	__pa(opal_mc_secondary_handler[0]),
	86	glue);
	87	glue += 128;
	88	opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
	89	0, glue);
	90	glue += 128;
	91	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
	92
c4463b37	93	return 0;
14a43e69 BH	94	}
14a43e69 BH	95
c4463b37 JK	96	early_initcall(opal_register_exception_handlers);
c4463b37 JK	97
14a43e69 BH	98	int opal_get_chars(uint32_t vtermno, char *buf, int count)
	99	{
	100	s64 len, rc;
	101	u64 evt;
	102
	103	if (!opal.entry)
daea1175	104	return -ENODEV;
14a43e69 BH	105	opal_poll_events(&evt);
	106	if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
	107	return 0;
	108	len = count;
	109	rc = opal_console_read(vtermno, &len, buf);
	110	if (rc == OPAL_SUCCESS)
	111	return len;
	112	return 0;
	113	}
	114
	115	int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
	116	{
	117	int written = 0;
daea1175	118	s64 len, rc;
14a43e69 BH	119	unsigned long flags;
	120	u64 evt;
	121
	122	if (!opal.entry)
daea1175	123	return -ENODEV;
14a43e69 BH	124
	125	/* We want put_chars to be atomic to avoid mangling of hvsi
	126	* packets. To do that, we first test for room and return
daea1175 BH	127	* -EAGAIN if there isn't enough.
	128	*
	129	* Unfortunately, opal_console_write_buffer_space() doesn't
	130	* appear to work on opal v1, so we just assume there is
	131	* enough room and be done with it
14a43e69 BH	132	*/
14a43e69 BH	133	spin_lock_irqsave(&opal_write_lock, flags);
daea1175 BH	134	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
	135	rc = opal_console_write_buffer_space(vtermno, &len);
	136	if (rc \|\| len < total_len) {
	137	spin_unlock_irqrestore(&opal_write_lock, flags);
	138	/* Closed -> drop characters */
	139	if (rc)
	140	return total_len;
	141	opal_poll_events(&evt);
	142	return -EAGAIN;
	143	}
14a43e69 BH	144	}
	145
	146	/* We still try to handle partial completions, though they
	147	* should no longer happen.
	148	*/
daea1175	149	rc = OPAL_BUSY;
14a43e69 BH	150	while(total_len > 0 && (rc == OPAL_BUSY \|\|
	151	rc == OPAL_BUSY_EVENT \|\| rc == OPAL_SUCCESS)) {
	152	len = total_len;
	153	rc = opal_console_write(vtermno, &len, data);
1de1455f BH	154
	155	/* Closed or other error drop */
	156	if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
	157	rc != OPAL_BUSY_EVENT) {
	158	written = total_len;
	159	break;
	160	}
14a43e69 BH	161	if (rc == OPAL_SUCCESS) {
	162	total_len -= len;
	163	data += len;
	164	written += len;
	165	}
	166	/* This is a bit nasty but we need that for the console to
	167	* flush when there aren't any interrupts. We will clean
	168	* things a bit later to limit that to synchronous path
	169	* such as the kernel console and xmon/udbg
	170	*/
	171	do
	172	opal_poll_events(&evt);
	173	while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
	174	}
	175	spin_unlock_irqrestore(&opal_write_lock, flags);
	176	return written;
	177	}
	178
ed79ba9e BH	179	int opal_machine_check(struct pt_regs *regs)
	180	{
	181	struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
	182	struct opal_machine_check_event evt;
	183	const char level, sevstr, *subtype;
	184	static const char *opal_mc_ue_types[] = {
	185	"Indeterminate",
	186	"Instruction fetch",
	187	"Page table walk ifetch",
	188	"Load/Store",
	189	"Page table walk Load/Store",
	190	};
	191	static const char *opal_mc_slb_types[] = {
	192	"Indeterminate",
	193	"Parity",
	194	"Multihit",
	195	};
	196	static const char *opal_mc_erat_types[] = {
	197	"Indeterminate",
	198	"Parity",
	199	"Multihit",
	200	};
	201	static const char *opal_mc_tlb_types[] = {
	202	"Indeterminate",
	203	"Parity",
	204	"Multihit",
	205	};
	206
	207	/* Copy the event structure and release the original */
	208	evt = *opal_evt;
	209	opal_evt->in_use = 0;
	210
	211	/* Print things out */
	212	if (evt.version != OpalMCE_V1) {
	213	pr_err("Machine Check Exception, Unknown event version %d !\n",
	214	evt.version);
	215	return 0;
	216	}
	217	switch(evt.severity) {
	218	case OpalMCE_SEV_NO_ERROR:
	219	level = KERN_INFO;
	220	sevstr = "Harmless";
	221	break;
	222	case OpalMCE_SEV_WARNING:
	223	level = KERN_WARNING;
	224	sevstr = "";
	225	break;
	226	case OpalMCE_SEV_ERROR_SYNC:
	227	level = KERN_ERR;
	228	sevstr = "Severe";
	229	break;
	230	case OpalMCE_SEV_FATAL:
	231	default:
	232	level = KERN_ERR;
	233	sevstr = "Fatal";
	234	break;
	235	}
	236
	237	printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
	238	evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
	239	"Recovered" : "[Not recovered");
	240	printk("%s Initiator: %s\n", level,
	241	evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
	242	switch(evt.error_type) {
243	case OpalMCE_ERROR_TYPE_UE:
244	subtype = evt.u.ue_error.ue_error_type <
245	ARRAY_SIZE(opal_mc_ue_types) ?
246	opal_mc_ue_types[evt.u.ue_error.ue_error_type]
247	: "Unknown";
248	printk("%s Error type: UE [%s]\n", level, subtype);
249	if (evt.u.ue_error.effective_address_provided)
250	printk("%s Effective address: %016llx\n",
251	level, evt.u.ue_error.effective_address);
252	if (evt.u.ue_error.physical_address_provided)
253	printk("%s Physial address: %016llx\n",
254	level, evt.u.ue_error.physical_address);
255	break;
256	case OpalMCE_ERROR_TYPE_SLB:
257	subtype = evt.u.slb_error.slb_error_type <
258	ARRAY_SIZE(opal_mc_slb_types) ?
259	opal_mc_slb_types[evt.u.slb_error.slb_error_type]
260	: "Unknown";
261	printk("%s Error type: SLB [%s]\n", level, subtype);
262	if (evt.u.slb_error.effective_address_provided)
263	printk("%s Effective address: %016llx\n",
264	level, evt.u.slb_error.effective_address);
265	break;
266	case OpalMCE_ERROR_TYPE_ERAT:
267	subtype = evt.u.erat_error.erat_error_type <
268	ARRAY_SIZE(opal_mc_erat_types) ?
269	opal_mc_erat_types[evt.u.erat_error.erat_error_type]
270	: "Unknown";
271	printk("%s Error type: ERAT [%s]\n", level, subtype);
272	if (evt.u.erat_error.effective_address_provided)
273	printk("%s Effective address: %016llx\n",
274	level, evt.u.erat_error.effective_address);
275	break;
276	case OpalMCE_ERROR_TYPE_TLB:
277	subtype = evt.u.tlb_error.tlb_error_type <
278	ARRAY_SIZE(opal_mc_tlb_types) ?
279	opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
280	: "Unknown";
281	printk("%s Error type: TLB [%s]\n", level, subtype);
282	if (evt.u.tlb_error.effective_address_provided)
283	printk("%s Effective address: %016llx\n",
284	level, evt.u.tlb_error.effective_address);
285	break;
286	default:
287	case OpalMCE_ERROR_TYPE_UNKNOWN:
288	printk("%s Error type: Unknown\n", level);
289	break;
290	}
291	return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
292	}
293
a125e092 BH	294	static irqreturn_t opal_interrupt(int irq, void *data)
	295	{
	296	uint64_t events;
	297
	298	opal_handle_interrupt(virq_to_hw(irq), &events);
	299
	300	/* XXX TODO: Do something with the events */
	301
	302	return IRQ_HANDLED;
	303	}
	304
14a43e69 BH	305	static int __init opal_init(void)
	306	{
	307	struct device_node np, consoles;
a125e092 BH	308	const u32 *irqs;
a125e092 BH	309	int rc, i, irqlen;
14a43e69 BH	310
	311	opal_node = of_find_node_by_path("/ibm,opal");
	312	if (!opal_node) {
	313	pr_warn("opal: Node not found\n");
	314	return -ENODEV;
	315	}
	316	if (firmware_has_feature(FW_FEATURE_OPALv2))
	317	consoles = of_find_node_by_path("/ibm,opal/consoles");
	318	else
	319	consoles = of_node_get(opal_node);
	320
	321	/* Register serial ports */
	322	for_each_child_of_node(consoles, np) {
	323	if (strcmp(np->name, "serial"))
	324	continue;
	325	of_platform_device_create(np, NULL, NULL);
	326	}
	327	of_node_put(consoles);
a125e092 BH	328
	329	/* Find all OPAL interrupts and request them */
	330	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
	331	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
	332	irqs ? (irqlen / 4) : 0);
73ed148a BH	333	opal_irq_count = irqlen / 4;
73ed148a BH	334	opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
a125e092 BH	335	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
	336	unsigned int hwirq = be32_to_cpup(irqs);
	337	unsigned int irq = irq_create_mapping(NULL, hwirq);
	338	if (irq == NO_IRQ) {
	339	pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
	340	continue;
	341	}
	342	rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
	343	if (rc)
	344	pr_warning("opal: Error %d requesting irq %d"
	345	" (0x%x)\n", rc, irq, hwirq);
73ed148a	346	opal_irqs[i] = irq;
a125e092	347	}
14a43e69 BH	348	return 0;
	349	}
	350	subsys_initcall(opal_init);
73ed148a BH	351
	352	void opal_shutdown(void)
	353	{
	354	unsigned int i;
	355
	356	for (i = 0; i < opal_irq_count; i++) {
	357	if (opal_irqs[i])
	358	free_irq(opal_irqs[i], 0);
	359	opal_irqs[i] = 0;
	360	}
	361	}