arch/i386/mach-es7000/es7000plat.c

   1 /*
   2  * Written by: Garry Forsgren, Unisys Corporation
   3  *             Natalie Protasevich, Unisys Corporation
   4  * This file contains the code to configure and interface
   5  * with Unisys ES7000 series hardware system manager.
   6  *
   7  * Copyright (c) 2003 Unisys Corporation.  All Rights Reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it would be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write the Free Software Foundation, Inc., 59
  19  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  20  *
  21  * Contact information: Unisys Corporation, Township Line & Union Meeting
  22  * Roads-A, Unisys Way, Blue Bell, Pennsylvania, 19424, or:
  23  *
  24  * http://www.unisys.com
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/smp.h>
  31 #include <linux/string.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/errno.h>
  34 #include <linux/notifier.h>
  35 #include <linux/reboot.h>
  36 #include <linux/init.h>
  37 #include <linux/acpi.h>
  38 #include <asm/io.h>
  39 #include <asm/nmi.h>
  40 #include <asm/smp.h>
  41 #include <asm/apicdef.h>
  42 #include "es7000.h"
  43
  44 /*
  45  * ES7000 Globals
  46  */
  47
  48 volatile unsigned long  *psai = NULL;
  49 struct mip_reg          *mip_reg;
  50 struct mip_reg          *host_reg;
  51 int                     mip_port;
  52 unsigned long           mip_addr, host_addr;
  53
  54 #if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_ACPI_BOOT))
  55
  56 /*
  57  * GSI override for ES7000 platforms.
  58  */
  59
  60 static unsigned int base;
  61
  62 static int
  63 es7000_rename_gsi(int ioapic, int gsi)
  64 {
  65         if (!base) {
  66                 int i;
  67                 for (i = 0; i < nr_ioapics; i++)
  68                         base += nr_ioapic_registers[i];
  69         }
  70
  71         if (!ioapic && (gsi < 16))
  72                 gsi += base;
  73         return gsi;
  74 }
  75
  76 #endif // (CONFIG_X86_IO_APIC) && (CONFIG_ACPI_INTERPRETER || CONFIG_ACPI_BOOT)
  77
  78 void __init
  79 setup_unisys ()
  80 {
  81         /*
  82          * Determine the generation of the ES7000 currently running.
  83          *
  84          * es7000_plat = 1 if the machine is a 5xx ES7000 box
  85          * es7000_plat = 2 if the machine is a x86_64 ES7000 box
  86          *
  87          */
  88         if (!(boot_cpu_data.x86 <= 15 && boot_cpu_data.x86_model <= 2))
  89                 es7000_plat = 2;
  90         else
  91                 es7000_plat = 1;
  92         ioapic_renumber_irq = es7000_rename_gsi;
  93 }
  94
  95 /*
  96  * Parse the OEM Table
  97  */
  98
  99 int __init
 100 parse_unisys_oem (char *oemptr)
 101 {
 102         int                     i;
 103         int                     success = 0;
 104         unsigned char           type, size;
 105         unsigned long           val;
 106         char                    *tp = NULL;
 107         struct psai             *psaip = NULL;
 108         struct mip_reg_info     *mi;
 109         struct mip_reg          *host, *mip;
 110
 111         tp = oemptr;
 112
 113         tp += 8;
 114
 115         for (i=0; i <= 6; i++) {
 116                 type = *tp++;
 117                 size = *tp++;
 118                 tp -= 2;
 119                 switch (type) {
 120                 case MIP_REG:
 121                         mi = (struct mip_reg_info *)tp;
 122                         val = MIP_RD_LO(mi->host_reg);
 123                         host_addr = val;
 124                         host = (struct mip_reg *)val;
 125                         host_reg = __va(host);
 126                         val = MIP_RD_LO(mi->mip_reg);
 127                         mip_port = MIP_PORT(mi->mip_info);
 128                         mip_addr = val;
 129                         mip = (struct mip_reg *)val;
 130                         mip_reg = __va(mip);
 131                         Dprintk("es7000_mipcfg: host_reg = 0x%lx \n",
 132                                 (unsigned long)host_reg);
 133                         Dprintk("es7000_mipcfg: mip_reg = 0x%lx \n",
 134                                 (unsigned long)mip_reg);
 135                         success++;
 136                         break;
 137                 case MIP_PSAI_REG:
 138                         psaip = (struct psai *)tp;
 139                         if (tp != NULL) {
 140                                 if (psaip->addr)
 141                                         psai = __va(psaip->addr);
 142                                 else
 143                                         psai = NULL;
 144                                 success++;
 145                         }
 146                         break;
 147                 default:
 148                         break;
 149                 }
 150                 tp += size;
 151         }
 152
 153         if (success < 2) {
 154                 es7000_plat = 0;
 155         } else
 156                 setup_unisys();
 157         return es7000_plat;
 158 }
 159
 160 int __init
 161 find_unisys_acpi_oem_table(unsigned long *oem_addr)
 162 {
 163         struct acpi_table_rsdp          *rsdp = NULL;
 164         unsigned long                   rsdp_phys = 0;
 165         struct acpi_table_header        *header = NULL;
 166         int                             i;
 167         struct acpi_table_sdt           sdt;
 168
 169         rsdp_phys = acpi_find_rsdp();
 170         rsdp = __va(rsdp_phys);
 171         if (rsdp->rsdt_address) {
 172                 struct acpi_table_rsdt  *mapped_rsdt = NULL;
 173                 sdt.pa = rsdp->rsdt_address;
 174
 175                 header = (struct acpi_table_header *)
 176                         __acpi_map_table(sdt.pa, sizeof(struct acpi_table_header));
 177                 if (!header)
 178                         return -ENODEV;
 179
 180                 sdt.count = (header->length - sizeof(struct acpi_table_header)) >> 3;
 181                 mapped_rsdt = (struct acpi_table_rsdt *)
 182                         __acpi_map_table(sdt.pa, header->length);
 183                 if (!mapped_rsdt)
 184                         return -ENODEV;
 185
 186                 header = &mapped_rsdt->header;
 187
 188                 for (i = 0; i < sdt.count; i++)
 189                         sdt.entry[i].pa = (unsigned long) mapped_rsdt->entry[i];
 190         };
 191         for (i = 0; i < sdt.count; i++) {
 192
 193                 header = (struct acpi_table_header *)
 194                         __acpi_map_table(sdt.entry[i].pa,
 195                                 sizeof(struct acpi_table_header));
 196                 if (!header)
 197                         continue;
 198                 if (!strncmp((char *) &header->signature, "OEM1", 4)) {
 199                         if (!strncmp((char *) &header->oem_id, "UNISYS", 6)) {
 200                                 void *addr;
 201                                 struct oem_table *t;
 202                                 acpi_table_print(header, sdt.entry[i].pa);
 203                                 t = (struct oem_table *) __acpi_map_table(sdt.entry[i].pa, header->length);
 204                                 addr = (void *) __acpi_map_table(t->OEMTableAddr, t->OEMTableSize);
 205                                 *oem_addr = (unsigned long) addr;
 206                                 return 0;
 207                         }
 208                 }
 209         }
 210         return -1;
 211 }
 212
 213 static void
 214 es7000_spin(int n)
 215 {
 216         int i = 0;
 217
 218         while (i++ < n)
 219                 rep_nop();
 220 }
 221
 222 static int __init
 223 es7000_mip_write(struct mip_reg *mip_reg)
 224 {
 225         int                     status = 0;
 226         int                     spin;
 227
 228         spin = MIP_SPIN;
 229         while (((unsigned long long)host_reg->off_38 &
 230                 (unsigned long long)MIP_VALID) != 0) {
 231                         if (--spin <= 0) {
 232                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 233                                 return -1;
 234                         }
 235                 es7000_spin(MIP_SPIN);
 236         }
 237
 238         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 239         outb(1, mip_port);
 240
 241         spin = MIP_SPIN;
 242
 243         while (((unsigned long long)mip_reg->off_38 &
 244                 (unsigned long long)MIP_VALID) == 0) {
 245                 if (--spin <= 0) {
 246                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 247                         return -1;
 248                 }
 249                 es7000_spin(MIP_SPIN);
 250         }
 251
 252         status = ((unsigned long long)mip_reg->off_0 &
 253                 (unsigned long long)0xffff0000000000ULL) >> 48;
 254         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 255                 (unsigned long long)~MIP_VALID);
 256         return status;
 257 }
 258
 259 int
 260 es7000_start_cpu(int cpu, unsigned long eip)
 261 {
 262         unsigned long vect = 0, psaival = 0;
 263
 264         if (psai == NULL)
 265                 return -1;
 266
 267         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 268         psaival = (0x1000000 | vect | cpu);
 269
 270         while (*psai & 0x1000000)
 271                 ;
 272
 273         *psai = psaival;
 274
 275         return 0;
 276
 277 }
 278
 279 int
 280 es7000_stop_cpu(int cpu)
 281 {
 282         int startup;
 283
 284         if (psai == NULL)
 285                 return -1;
 286
 287         startup= (0x1000000 | cpu);
 288
 289         while ((*psai & 0xff00ffff) != startup)
 290                 ;
 291
 292         startup = (*psai & 0xff0000) >> 16;
 293         *psai &= 0xffffff;
 294
 295         return 0;
 296
 297 }
 298
 299 void __init
 300 es7000_sw_apic()
 301 {
 302         if (es7000_plat) {
 303                 int mip_status;
 304                 struct mip_reg es7000_mip_reg;
 305
 306                 printk("ES7000: Enabling APIC mode.\n");
 307                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 308                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 309                 es7000_mip_reg.off_38 = (MIP_VALID);
 310                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 311                         printk("es7000_sw_apic: command failed, status = %x\n",
 312                                 mip_status);
 313                 return;
 314         }
 315 }