1/*
2 * sfi.c - x86 architecture SFI support.
3 *
4 * Copyright (c) 2009, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 */
20
21#define KMSG_COMPONENT "SFI"
22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24#include <linux/acpi.h>
25#include <linux/init.h>
26#include <linux/sfi.h>
27#include <linux/io.h>
28#include <linux/irqdomain.h>
29
30#include <asm/io_apic.h>
31#include <asm/mpspec.h>
32#include <asm/setup.h>
33#include <asm/apic.h>
34
35#ifdef CONFIG_X86_LOCAL_APIC
36static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
37
38/* All CPUs enumerated by SFI must be present and enabled */
39static void __init mp_sfi_register_lapic(u8 id)
40{
41	if (MAX_LOCAL_APIC - id <= 0) {
42		pr_warning("Processor #%d invalid (max %d)\n",
43			id, MAX_LOCAL_APIC);
44		return;
45	}
46
47	pr_info("registering lapic[%d]\n", id);
48
49	generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
50}
51
52static int __init sfi_parse_cpus(struct sfi_table_header *table)
53{
54	struct sfi_table_simple *sb;
55	struct sfi_cpu_table_entry *pentry;
56	int i;
57	int cpu_num;
58
59	sb = (struct sfi_table_simple *)table;
60	cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
61	pentry = (struct sfi_cpu_table_entry *)sb->pentry;
62
63	for (i = 0; i < cpu_num; i++) {
64		mp_sfi_register_lapic(pentry->apic_id);
65		pentry++;
66	}
67
68	smp_found_config = 1;
69	return 0;
70}
71#endif /* CONFIG_X86_LOCAL_APIC */
72
73#ifdef CONFIG_X86_IO_APIC
74static struct irq_domain_ops sfi_ioapic_irqdomain_ops = {
75	.map = mp_irqdomain_map,
76};
77
78static int __init sfi_parse_ioapic(struct sfi_table_header *table)
79{
80	struct sfi_table_simple *sb;
81	struct sfi_apic_table_entry *pentry;
82	int i, num;
83	struct ioapic_domain_cfg cfg = {
84		.type = IOAPIC_DOMAIN_STRICT,
85		.ops = &sfi_ioapic_irqdomain_ops,
86	};
87
88	sb = (struct sfi_table_simple *)table;
89	num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
90	pentry = (struct sfi_apic_table_entry *)sb->pentry;
91
92	for (i = 0; i < num; i++) {
93		mp_register_ioapic(i, pentry->phys_addr, gsi_top, &cfg);
94		pentry++;
95	}
96
97	WARN(pic_mode, KERN_WARNING
98		"SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
99	pic_mode = 0;
100	return 0;
101}
102#endif /* CONFIG_X86_IO_APIC */
103
104/*
105 * sfi_platform_init(): register lapics & io-apics
106 */
107int __init sfi_platform_init(void)
108{
109#ifdef CONFIG_X86_LOCAL_APIC
110	register_lapic_address(sfi_lapic_addr);
111	sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
112#endif
113#ifdef CONFIG_X86_IO_APIC
114	sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
115#endif
116	return 0;
117}
118