arch/ia64/uv/kernel/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * SGI UV Core Functions
   7  *
   8  * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
   9  */
  10
  11 #include <linux/acpi.h>
  12 #include <linux/efi.h>
  13 #include <linux/module.h>
  14 #include <linux/percpu.h>
  15 #include <asm/uv/uv.h>
  16 #include <asm/uv/uv_mmrs.h>
  17 #include <asm/uv/uv_hub.h>
  18
  19 bool ia64_is_uv;
  20 EXPORT_SYMBOL_GPL(ia64_is_uv);
  21
  22 DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
  23 EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
  24
  25 struct redir_addr {
  26         unsigned long redirect;
  27         unsigned long alias;
  28 };
  29
  30 #define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT
  31
  32 static __initdata struct redir_addr redir_addrs[] = {
  33         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR, UVH_SI_ALIAS0_OVERLAY_CONFIG},
  34         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_1_MMR, UVH_SI_ALIAS1_OVERLAY_CONFIG},
  35         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_SI_ALIAS2_OVERLAY_CONFIG},
  36 };
  37
  38 static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
  39 {
  40         union uvh_si_alias0_overlay_config_u alias;
  41         union uvh_rh_gam_alias210_redirect_config_2_mmr_u redirect;
  42         int i;
  43
  44         for (i = 0; i < ARRAY_SIZE(redir_addrs); i++) {
  45                 alias.v = uv_read_local_mmr(redir_addrs[i].alias);
  46                 if (alias.s.base == 0) {
  47                         *size = (1UL << alias.s.m_alias);
  48                         redirect.v = uv_read_local_mmr(redir_addrs[i].redirect);
  49                         *base = (unsigned long)redirect.s.dest_base << DEST_SHIFT;
  50                         return;
  51                 }
  52         }
  53         BUG();
  54 }
  55
  56 void __init uv_probe_system_type(void)
  57 {
  58         struct acpi_table_rsdp *rsdp;
  59         struct acpi_table_xsdt *xsdt;
  60
  61         if (efi.acpi20 == EFI_INVALID_TABLE_ADDR) {
  62                 pr_err("ACPI 2.0 RSDP not found.\n");
  63                 return;
  64         }
  65
  66         rsdp = (struct acpi_table_rsdp *)__va(efi.acpi20);
  67         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  68                 pr_err("ACPI 2.0 RSDP signature incorrect.\n");
  69                 return;
  70         }
  71
  72         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
  73         if (strncmp(xsdt->header.signature, ACPI_SIG_XSDT,
  74                         sizeof(ACPI_SIG_XSDT) - 1)) {
  75                 pr_err("ACPI 2.0 XSDT signature incorrect.\n");
  76                 return;
  77         }
  78
  79         if (!strcmp(xsdt->header.oem_id, "SGI") &&
  80             !strcmp(xsdt->header.oem_table_id + 4, "UV"))
  81                 ia64_is_uv = true;
  82 }
  83
  84 void __init uv_setup(char **cmdline_p)
  85 {
  86         union uvh_si_addr_map_config_u m_n_config;
  87         union uvh_node_id_u node_id;
  88         unsigned long gnode_upper;
  89         int nid, cpu, m_val, n_val;
  90         unsigned long mmr_base, lowmem_redir_base, lowmem_redir_size;
  91
  92         get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
  93         node_id.v = uv_read_local_mmr(UVH_NODE_ID);
  94         m_n_config.v = uv_read_local_mmr(UVH_SI_ADDR_MAP_CONFIG);
  95         mmr_base = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
  96                         ~UV_MMR_ENABLE;
  97
  98         m_val = m_n_config.s.m_skt;
  99         n_val = m_n_config.s.n_skt;
 100         printk(KERN_DEBUG "UV: global MMR base 0x%lx\n", mmr_base);
 101
 102         gnode_upper = (((unsigned long)node_id.s.node_id) &
 103                        ~((1 << n_val) - 1)) << m_val;
 104
 105         for_each_present_cpu(cpu) {
 106                 nid = cpu_to_node(cpu);
 107                 uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
 108                 uv_cpu_hub_info(cpu)->lowmem_remap_top =
 109                         lowmem_redir_base + lowmem_redir_size;
 110                 uv_cpu_hub_info(cpu)->m_val = m_val;
 111                 uv_cpu_hub_info(cpu)->n_val = n_val;
 112                 uv_cpu_hub_info(cpu)->pnode_mask = (1 << n_val) -1;
 113                 uv_cpu_hub_info(cpu)->gpa_mask = (1 << (m_val + n_val)) - 1;
 114                 uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
 115                 uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
 116                 uv_cpu_hub_info(cpu)->coherency_domain_number = 0;/* ZZZ */
 117                 printk(KERN_DEBUG "UV cpu %d, nid %d\n", cpu, nid);
 118         }
 119 }
 120