arch/x86/platform/sfi/sfi.c

   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
  36 static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  37
  38 /* All CPUs enumerated by SFI must be present and enabled */
  39 static 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
  52 static 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
  74 static struct irq_domain_ops sfi_ioapic_irqdomain_ops = {
  75         .map = mp_irqdomain_map,
  76 };
  77
  78 static 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  */
 107 int __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 }