arch/x86/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 #include <mach_mpparse.h>
  44
  45 /*
  46  * ES7000 Globals
  47  */
  48
  49 static volatile unsigned long   *psai = NULL;
  50 static struct mip_reg           *mip_reg;
  51 static struct mip_reg           *host_reg;
  52 static int                      mip_port;
  53 static unsigned long            mip_addr, host_addr;
  54
  55 /*
  56  * GSI override for ES7000 platforms.
  57  */
  58
  59 static unsigned int base;
  60
  61 static int
  62 es7000_rename_gsi(int ioapic, int gsi)
  63 {
  64         if (es7000_plat == ES7000_ZORRO)
  65                 return gsi;
  66
  67         if (!base) {
  68                 int i;
  69                 for (i = 0; i < nr_ioapics; i++)
  70                         base += nr_ioapic_registers[i];
  71         }
  72
  73         if (!ioapic && (gsi < 16))
  74                 gsi += base;
  75         return gsi;
  76 }
  77
  78 void __init
  79 setup_unisys(void)
  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 = ES7000_ZORRO;
  90         else
  91                 es7000_plat = ES7000_CLASSIC;
  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 = NON_UNISYS;
 155         } else
 156                 setup_unisys();
 157         return es7000_plat;
 158 }
 159
 160 #ifdef CONFIG_ACPI
 161 int __init
 162 find_unisys_acpi_oem_table(unsigned long *oem_addr)
 163 {
 164         struct acpi_table_header *header = NULL;
 165         int i = 0;
 166         while (ACPI_SUCCESS(acpi_get_table("OEM1", i++, &header))) {
 167                 if (!memcmp((char *) &header->oem_id, "UNISYS", 6)) {
 168                         struct oem_table *t = (struct oem_table *)header;
 169                         *oem_addr = (unsigned long)__acpi_map_table(t->OEMTableAddr,
 170                                                                     t->OEMTableSize);
 171                         return 0;
 172                 }
 173         }
 174         return -1;
 175 }
 176 #endif
 177
 178 /*
 179  * This file also gets compiled if CONFIG_X86_GENERICARCH is set. Generic
 180  * arch already has got following function definitions (asm-generic/es7000.c)
 181  * hence no need to define these for that case.
 182  */
 183 #ifndef CONFIG_X86_GENERICARCH
 184 void es7000_sw_apic(void);
 185 void __init enable_apic_mode(void)
 186 {
 187         es7000_sw_apic();
 188         return;
 189 }
 190
 191 __init int mps_oem_check(struct mp_config_table *mpc, char *oem,
 192                 char *productid)
 193 {
 194         if (mpc->mpc_oemptr) {
 195                 struct mp_config_oemtable *oem_table =
 196                         (struct mp_config_oemtable *)mpc->mpc_oemptr;
 197                 if (!strncmp(oem, "UNISYS", 6))
 198                         return parse_unisys_oem((char *)oem_table);
 199         }
 200         return 0;
 201 }
 202 #ifdef CONFIG_ACPI
 203 /* Hook from generic ACPI tables.c */
 204 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 205 {
 206         unsigned long oem_addr;
 207         if (!find_unisys_acpi_oem_table(&oem_addr)) {
 208                 if (es7000_check_dsdt())
 209                         return parse_unisys_oem((char *)oem_addr);
 210                 else {
 211                         setup_unisys();
 212                         return 1;
 213                 }
 214         }
 215         return 0;
 216 }
 217 #else
 218 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 219 {
 220         return 0;
 221 }
 222 #endif
 223 #endif /* COFIG_X86_GENERICARCH */
 224
 225 static void
 226 es7000_spin(int n)
 227 {
 228         int i = 0;
 229
 230         while (i++ < n)
 231                 rep_nop();
 232 }
 233
 234 static int __init
 235 es7000_mip_write(struct mip_reg *mip_reg)
 236 {
 237         int                     status = 0;
 238         int                     spin;
 239
 240         spin = MIP_SPIN;
 241         while (((unsigned long long)host_reg->off_38 &
 242                 (unsigned long long)MIP_VALID) != 0) {
 243                         if (--spin <= 0) {
 244                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 245                                 return -1;
 246                         }
 247                 es7000_spin(MIP_SPIN);
 248         }
 249
 250         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 251         outb(1, mip_port);
 252
 253         spin = MIP_SPIN;
 254
 255         while (((unsigned long long)mip_reg->off_38 &
 256                 (unsigned long long)MIP_VALID) == 0) {
 257                 if (--spin <= 0) {
 258                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 259                         return -1;
 260                 }
 261                 es7000_spin(MIP_SPIN);
 262         }
 263
 264         status = ((unsigned long long)mip_reg->off_0 &
 265                 (unsigned long long)0xffff0000000000ULL) >> 48;
 266         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 267                 (unsigned long long)~MIP_VALID);
 268         return status;
 269 }
 270
 271 int
 272 es7000_start_cpu(int cpu, unsigned long eip)
 273 {
 274         unsigned long vect = 0, psaival = 0;
 275
 276         if (psai == NULL)
 277                 return -1;
 278
 279         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 280         psaival = (0x1000000 | vect | cpu);
 281
 282         while (*psai & 0x1000000)
 283                 ;
 284
 285         *psai = psaival;
 286
 287         return 0;
 288
 289 }
 290
 291 void __init
 292 es7000_sw_apic(void)
 293 {
 294         if (es7000_plat) {
 295                 int mip_status;
 296                 struct mip_reg es7000_mip_reg;
 297
 298                 printk("ES7000: Enabling APIC mode.\n");
 299                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 300                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 301                 es7000_mip_reg.off_38 = (MIP_VALID);
 302                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 303                         printk("es7000_sw_apic: command failed, status = %x\n",
 304                                 mip_status);
 305                 return;
 306         }
 307 }