arch/i386/mach-es7000/es7000.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 /*
  55  * Parse the OEM Table
  56  */
  57
  58 void __init
  59 parse_unisys_oem (char *oemptr, int oem_entries)
  60 {
  61         int                     i;
  62         int                     success = 0;
  63         unsigned char           type, size;
  64         unsigned long           val;
  65         char                    *tp = NULL;
  66         struct psai             *psaip = NULL;
  67         struct mip_reg_info     *mi;
  68         struct mip_reg          *host, *mip;
  69
  70         tp = oemptr;
  71
  72         tp += 8;
  73
  74         for (i=0; i <= oem_entries; i++) {
  75                 type = *tp++;
  76                 size = *tp++;
  77                 tp -= 2;
  78                 switch (type) {
  79                 case MIP_REG:
  80                         mi = (struct mip_reg_info *)tp;
  81                         val = MIP_RD_LO(mi->host_reg);
  82                         host_addr = val;
  83                         host = (struct mip_reg *)val;
  84                         host_reg = __va(host);
  85                         val = MIP_RD_LO(mi->mip_reg);
  86                         mip_addr = val;
  87                         mip = (struct mip_reg *)val;
  88                         mip_reg = __va(mip);
  89                         Dprintk("es7000_mipcfg: host_reg = 0x%lx \n",
  90                                 (unsigned long)host_reg);
  91                         Dprintk("es7000_mipcfg: mip_reg = 0x%lx \n",
  92                                 (unsigned long)mip_reg);
  93                         success++;
  94                         break;
  95                 case MIP_PSAI_REG:
  96                         psaip = (struct psai *)tp;
  97                         if (tp != NULL) {
  98                                 if (psaip->addr)
  99                                         psai = __va(psaip->addr);
 100                                 else
 101                                         psai = NULL;
 102                                 success++;
 103                         }
 104                         break;
 105                 default:
 106                         break;
 107                 }
 108                 if (i == 6) break;
 109                 tp += size;
 110         }
 111
 112         if (success < 2) {
 113                 printk("\nNo ES7000 found.\n");
 114                 es7000_plat = 0;
 115         } else {
 116                 printk("\nEnabling ES7000 specific features...\n");
 117                 es7000_plat = 1;
 118         }
 119         return;
 120 }
 121
 122 int __init
 123 find_unisys_acpi_oem_table(unsigned long *oem_addr, int *length)
 124 {
 125         struct acpi_table_rsdp          *rsdp = NULL;
 126         unsigned long                   rsdp_phys = 0;
 127         struct acpi_table_header        *header = NULL;
 128         int                             i;
 129         struct acpi_table_sdt           sdt;
 130
 131         rsdp_phys = acpi_find_rsdp();
 132         rsdp = __va(rsdp_phys);
 133         if (rsdp->rsdt_address) {
 134                 struct acpi_table_rsdt  *mapped_rsdt = NULL;
 135                 sdt.pa = rsdp->rsdt_address;
 136
 137                 header = (struct acpi_table_header *)
 138                         __acpi_map_table(sdt.pa, sizeof(struct acpi_table_header));
 139                 if (!header)
 140                         return -ENODEV;
 141
 142                 sdt.count = (header->length - sizeof(struct acpi_table_header)) >> 3;
 143                 mapped_rsdt = (struct acpi_table_rsdt *)
 144                         __acpi_map_table(sdt.pa, header->length);
 145                 if (!mapped_rsdt)
 146                         return -ENODEV;
 147
 148                 header = &mapped_rsdt->header;
 149
 150                 for (i = 0; i < sdt.count; i++)
 151                         sdt.entry[i].pa = (unsigned long) mapped_rsdt->entry[i];
 152         };
 153         for (i = 0; i < sdt.count; i++) {
 154
 155                 header = (struct acpi_table_header *)
 156                         __acpi_map_table(sdt.entry[i].pa,
 157                                 sizeof(struct acpi_table_header));
 158                 if (!header)
 159                         continue;
 160                 if (!strncmp((char *) &header->signature, "OEM1", 4)) {
 161                         if (!strncmp((char *) &header->oem_id, "UNISYS", 6)) {
 162                                 void *addr;
 163                                 struct oem_table *t;
 164                                 acpi_table_print(header, sdt.entry[i].pa);
 165                                 t = (struct oem_table *) __acpi_map_table(sdt.entry[i].pa, header->length);
 166                                 addr = (void *) __acpi_map_table(t->OEMTableAddr, t->OEMTableSize);
 167                                 *length = header->length;
 168                                 *oem_addr = (unsigned long) addr;
 169                                 return 0;
 170                         }
 171                 }
 172         }
 173         printk("ES7000: did not find Unisys ACPI OEM table!\n");
 174         return -1;
 175 }
 176
 177 static void
 178 es7000_spin(int n)
 179 {
 180         int i = 0;
 181
 182         while (i++ < n)
 183                 rep_nop();
 184 }
 185
 186 static int __init
 187 es7000_mip_write(struct mip_reg *mip_reg)
 188 {
 189         int                     status = 0;
 190         int                     spin;
 191
 192         spin = MIP_SPIN;
 193         while (((unsigned long long)host_reg->off_38 &
 194                 (unsigned long long)MIP_VALID) != 0) {
 195                         if (--spin <= 0) {
 196                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 197                                 return -1;
 198                         }
 199                 es7000_spin(MIP_SPIN);
 200         }
 201
 202         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 203         outb(1, mip_port);
 204
 205         spin = MIP_SPIN;
 206
 207         while (((unsigned long long)mip_reg->off_38 &
 208                 (unsigned long long)MIP_VALID) == 0) {
 209                 if (--spin <= 0) {
 210                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 211                         return -1;
 212                 }
 213                 es7000_spin(MIP_SPIN);
 214         }
 215
 216         status = ((unsigned long long)mip_reg->off_0 &
 217                 (unsigned long long)0xffff0000000000) >> 48;
 218         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 219                 (unsigned long long)~MIP_VALID);
 220         return status;
 221 }
 222
 223 int
 224 es7000_start_cpu(int cpu, unsigned long eip)
 225 {
 226         unsigned long vect = 0, psaival = 0;
 227
 228         if (psai == NULL)
 229                 return -1;
 230
 231         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 232         psaival = (0x1000000 | vect | cpu);
 233
 234         while (*psai & 0x1000000)
 235                 ;
 236
 237         *psai = psaival;
 238
 239         return 0;
 240
 241 }
 242
 243 int
 244 es7000_stop_cpu(int cpu)
 245 {
 246         int startup;
 247
 248         if (psai == NULL)
 249                 return -1;
 250
 251         startup= (0x1000000 | cpu);
 252
 253         while ((*psai & 0xff00ffff) != startup)
 254                 ;
 255
 256         startup = (*psai & 0xff0000) >> 16;
 257         *psai &= 0xffffff;
 258
 259         return 0;
 260
 261 }
 262
 263 void __init
 264 es7000_sw_apic()
 265 {
 266         if (es7000_plat) {
 267                 int mip_status;
 268                 struct mip_reg es7000_mip_reg;
 269
 270                 printk("ES7000: Enabling APIC mode.\n");
 271                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 272                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 273                 es7000_mip_reg.off_38 = (MIP_VALID);
 274                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 275                         printk("es7000_sw_apic: command failed, status = %x\n",
 276                                 mip_status);
 277                 return;
 278         }
 279 }