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                 es7000_plat = 1;
 142                 ioapic_renumber_irq = es7000_rename_gsi;
 143         }
 144         return es7000_plat;
 145 }
 146
 147 int __init
 148 find_unisys_acpi_oem_table(unsigned long *oem_addr, int *length)
 149 {
 150         struct acpi_table_rsdp          *rsdp = NULL;
 151         unsigned long                   rsdp_phys = 0;
 152         struct acpi_table_header        *header = NULL;
 153         int                             i;
 154         struct acpi_table_sdt           sdt;
 155
 156         rsdp_phys = acpi_find_rsdp();
 157         rsdp = __va(rsdp_phys);
 158         if (rsdp->rsdt_address) {
 159                 struct acpi_table_rsdt  *mapped_rsdt = NULL;
 160                 sdt.pa = rsdp->rsdt_address;
 161
 162                 header = (struct acpi_table_header *)
 163                         __acpi_map_table(sdt.pa, sizeof(struct acpi_table_header));
 164                 if (!header)
 165                         return -ENODEV;
 166
 167                 sdt.count = (header->length - sizeof(struct acpi_table_header)) >> 3;
 168                 mapped_rsdt = (struct acpi_table_rsdt *)
 169                         __acpi_map_table(sdt.pa, header->length);
 170                 if (!mapped_rsdt)
 171                         return -ENODEV;
 172
 173                 header = &mapped_rsdt->header;
 174
 175                 for (i = 0; i < sdt.count; i++)
 176                         sdt.entry[i].pa = (unsigned long) mapped_rsdt->entry[i];
 177         };
 178         for (i = 0; i < sdt.count; i++) {
 179
 180                 header = (struct acpi_table_header *)
 181                         __acpi_map_table(sdt.entry[i].pa,
 182                                 sizeof(struct acpi_table_header));
 183                 if (!header)
 184                         continue;
 185                 if (!strncmp((char *) &header->signature, "OEM1", 4)) {
 186                         if (!strncmp((char *) &header->oem_id, "UNISYS", 6)) {
 187                                 void *addr;
 188                                 struct oem_table *t;
 189                                 acpi_table_print(header, sdt.entry[i].pa);
 190                                 t = (struct oem_table *) __acpi_map_table(sdt.entry[i].pa, header->length);
 191                                 addr = (void *) __acpi_map_table(t->OEMTableAddr, t->OEMTableSize);
 192                                 *length = header->length;
 193                                 *oem_addr = (unsigned long) addr;
 194                                 return 0;
 195                         }
 196                 }
 197         }
 198         Dprintk("ES7000: did not find Unisys ACPI OEM table!\n");
 199         return -1;
 200 }
 201
 202 static void
 203 es7000_spin(int n)
 204 {
 205         int i = 0;
 206
 207         while (i++ < n)
 208                 rep_nop();
 209 }
 210
 211 static int __init
 212 es7000_mip_write(struct mip_reg *mip_reg)
 213 {
 214         int                     status = 0;
 215         int                     spin;
 216
 217         spin = MIP_SPIN;
 218         while (((unsigned long long)host_reg->off_38 &
 219                 (unsigned long long)MIP_VALID) != 0) {
 220                         if (--spin <= 0) {
 221                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 222                                 return -1;
 223                         }
 224                 es7000_spin(MIP_SPIN);
 225         }
 226
 227         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 228         outb(1, mip_port);
 229
 230         spin = MIP_SPIN;
 231
 232         while (((unsigned long long)mip_reg->off_38 &
 233                 (unsigned long long)MIP_VALID) == 0) {
 234                 if (--spin <= 0) {
 235                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 236                         return -1;
 237                 }
 238                 es7000_spin(MIP_SPIN);
 239         }
 240
 241         status = ((unsigned long long)mip_reg->off_0 &
 242                 (unsigned long long)0xffff0000000000ULL) >> 48;
 243         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 244                 (unsigned long long)~MIP_VALID);
 245         return status;
 246 }
 247
 248 int
 249 es7000_start_cpu(int cpu, unsigned long eip)
 250 {
 251         unsigned long vect = 0, psaival = 0;
 252
 253         if (psai == NULL)
 254                 return -1;
 255
 256         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 257         psaival = (0x1000000 | vect | cpu);
 258
 259         while (*psai & 0x1000000)
 260                 ;
 261
 262         *psai = psaival;
 263
 264         return 0;
 265
 266 }
 267
 268 int
 269 es7000_stop_cpu(int cpu)
 270 {
 271         int startup;
 272
 273         if (psai == NULL)
 274                 return -1;
 275
 276         startup= (0x1000000 | cpu);
 277
 278         while ((*psai & 0xff00ffff) != startup)
 279                 ;
 280
 281         startup = (*psai & 0xff0000) >> 16;
 282         *psai &= 0xffffff;
 283
 284         return 0;
 285
 286 }
 287
 288 void __init
 289 es7000_sw_apic()
 290 {
 291         if (es7000_plat) {
 292                 int mip_status;
 293                 struct mip_reg es7000_mip_reg;
 294
 295                 printk("ES7000: Enabling APIC mode.\n");
 296                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 297                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 298                 es7000_mip_reg.off_38 = (MIP_VALID);
 299                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 300                         printk("es7000_sw_apic: command failed, status = %x\n",
 301                                 mip_status);
 302                 return;
 303         }
 304 }