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 /*
  79  * Parse the OEM Table
  80  */
  81
  82 int __init
  83 parse_unisys_oem (char *oemptr, int oem_entries)
  84 {
  85         int                     i;
  86         int                     success = 0;
  87         unsigned char           type, size;
  88         unsigned long           val;
  89         char                    *tp = NULL;
  90         struct psai             *psaip = NULL;
  91         struct mip_reg_info     *mi;
  92         struct mip_reg          *host, *mip;
  93
  94         tp = oemptr;
  95
  96         tp += 8;
  97
  98         for (i=0; i <= oem_entries; i++) {
  99                 type = *tp++;
 100                 size = *tp++;
 101                 tp -= 2;
 102                 switch (type) {
 103                 case MIP_REG:
 104                         mi = (struct mip_reg_info *)tp;
 105                         val = MIP_RD_LO(mi->host_reg);
 106                         host_addr = val;
 107                         host = (struct mip_reg *)val;
 108                         host_reg = __va(host);
 109                         val = MIP_RD_LO(mi->mip_reg);
 110                         mip_port = MIP_PORT(mi->mip_info);
 111                         mip_addr = val;
 112                         mip = (struct mip_reg *)val;
 113                         mip_reg = __va(mip);
 114                         Dprintk("es7000_mipcfg: host_reg = 0x%lx \n",
 115                                 (unsigned long)host_reg);
 116                         Dprintk("es7000_mipcfg: mip_reg = 0x%lx \n",
 117                                 (unsigned long)mip_reg);
 118                         success++;
 119                         break;
 120                 case MIP_PSAI_REG:
 121                         psaip = (struct psai *)tp;
 122                         if (tp != NULL) {
 123                                 if (psaip->addr)
 124                                         psai = __va(psaip->addr);
 125                                 else
 126                                         psai = NULL;
 127                                 success++;
 128                         }
 129                         break;
 130                 default:
 131                         break;
 132                 }
 133                 if (i == 6) break;
 134                 tp += size;
 135         }
 136
 137         if (success < 2) {
 138                 es7000_plat = 0;
 139         } else {
 140                 printk("\nEnabling ES7000 specific features...\n");
 141                 /*
 142                  * Determine the generation of the ES7000 currently running.
 143                  *
 144                  * es7000_plat = 0 if the machine is NOT a Unisys ES7000 box
 145                  * es7000_plat = 1 if the machine is a 5xx ES7000 box
 146                  * es7000_plat = 2 if the machine is a x86_64 ES7000 box
 147                  *
 148                  */
 149                 if (!(boot_cpu_data.x86 <= 15 && boot_cpu_data.x86_model <= 2))
 150                         es7000_plat = 2;
 151                 else
 152                         es7000_plat = 1;
 153
 154                 ioapic_renumber_irq = es7000_rename_gsi;
 155         }
 156         return es7000_plat;
 157 }
 158
 159 int __init
 160 find_unisys_acpi_oem_table(unsigned long *oem_addr, int *length)
 161 {
 162         struct acpi_table_rsdp          *rsdp = NULL;
 163         unsigned long                   rsdp_phys = 0;
 164         struct acpi_table_header        *header = NULL;
 165         int                             i;
 166         struct acpi_table_sdt           sdt;
 167
 168         rsdp_phys = acpi_find_rsdp();
 169         rsdp = __va(rsdp_phys);
 170         if (rsdp->rsdt_address) {
 171                 struct acpi_table_rsdt  *mapped_rsdt = NULL;
 172                 sdt.pa = rsdp->rsdt_address;
 173
 174                 header = (struct acpi_table_header *)
 175                         __acpi_map_table(sdt.pa, sizeof(struct acpi_table_header));
 176                 if (!header)
 177                         return -ENODEV;
 178
 179                 sdt.count = (header->length - sizeof(struct acpi_table_header)) >> 3;
 180                 mapped_rsdt = (struct acpi_table_rsdt *)
 181                         __acpi_map_table(sdt.pa, header->length);
 182                 if (!mapped_rsdt)
 183                         return -ENODEV;
 184
 185                 header = &mapped_rsdt->header;
 186
 187                 for (i = 0; i < sdt.count; i++)
 188                         sdt.entry[i].pa = (unsigned long) mapped_rsdt->entry[i];
 189         };
 190         for (i = 0; i < sdt.count; i++) {
 191
 192                 header = (struct acpi_table_header *)
 193                         __acpi_map_table(sdt.entry[i].pa,
 194                                 sizeof(struct acpi_table_header));
 195                 if (!header)
 196                         continue;
 197                 if (!strncmp((char *) &header->signature, "OEM1", 4)) {
 198                         if (!strncmp((char *) &header->oem_id, "UNISYS", 6)) {
 199                                 void *addr;
 200                                 struct oem_table *t;
 201                                 acpi_table_print(header, sdt.entry[i].pa);
 202                                 t = (struct oem_table *) __acpi_map_table(sdt.entry[i].pa, header->length);
 203                                 addr = (void *) __acpi_map_table(t->OEMTableAddr, t->OEMTableSize);
 204                                 *length = header->length;
 205                                 *oem_addr = (unsigned long) addr;
 206                                 return 0;
 207                         }
 208                 }
 209         }
 210         Dprintk("ES7000: did not find Unisys ACPI OEM table!\n");
 211         return -1;
 212 }
 213
 214 static void
 215 es7000_spin(int n)
 216 {
 217         int i = 0;
 218
 219         while (i++ < n)
 220                 rep_nop();
 221 }
 222
 223 static int __init
 224 es7000_mip_write(struct mip_reg *mip_reg)
 225 {
 226         int                     status = 0;
 227         int                     spin;
 228
 229         spin = MIP_SPIN;
 230         while (((unsigned long long)host_reg->off_38 &
 231                 (unsigned long long)MIP_VALID) != 0) {
 232                         if (--spin <= 0) {
 233                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 234                                 return -1;
 235                         }
 236                 es7000_spin(MIP_SPIN);
 237         }
 238
 239         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 240         outb(1, mip_port);
 241
 242         spin = MIP_SPIN;
 243
 244         while (((unsigned long long)mip_reg->off_38 &
 245                 (unsigned long long)MIP_VALID) == 0) {
 246                 if (--spin <= 0) {
 247                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 248                         return -1;
 249                 }
 250                 es7000_spin(MIP_SPIN);
 251         }
 252
 253         status = ((unsigned long long)mip_reg->off_0 &
 254                 (unsigned long long)0xffff0000000000ULL) >> 48;
 255         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 256                 (unsigned long long)~MIP_VALID);
 257         return status;
 258 }
 259
 260 int
 261 es7000_start_cpu(int cpu, unsigned long eip)
 262 {
 263         unsigned long vect = 0, psaival = 0;
 264
 265         if (psai == NULL)
 266                 return -1;
 267
 268         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 269         psaival = (0x1000000 | vect | cpu);
 270
 271         while (*psai & 0x1000000)
 272                 ;
 273
 274         *psai = psaival;
 275
 276         return 0;
 277
 278 }
 279
 280 int
 281 es7000_stop_cpu(int cpu)
 282 {
 283         int startup;
 284
 285         if (psai == NULL)
 286                 return -1;
 287
 288         startup= (0x1000000 | cpu);
 289
 290         while ((*psai & 0xff00ffff) != startup)
 291                 ;
 292
 293         startup = (*psai & 0xff0000) >> 16;
 294         *psai &= 0xffffff;
 295
 296         return 0;
 297
 298 }
 299
 300 void __init
 301 es7000_sw_apic()
 302 {
 303         if (es7000_plat) {
 304                 int mip_status;
 305                 struct mip_reg es7000_mip_reg;
 306
 307                 printk("ES7000: Enabling APIC mode.\n");
 308                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 309                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 310                 es7000_mip_reg.off_38 = (MIP_VALID);
 311                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 312                         printk("es7000_sw_apic: command failed, status = %x\n",
 313                                 mip_status);
 314                 return;
 315         }
 316 }