arch/x86/kernel/es7000_32.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 <mach_mpparse.h>
  43
  44 /*
  45  * ES7000 chipsets
  46  */
  47
  48 #define NON_UNISYS              0
  49 #define ES7000_CLASSIC          1
  50 #define ES7000_ZORRO            2
  51
  52
  53 #define MIP_REG                 1
  54 #define MIP_PSAI_REG            4
  55
  56 #define MIP_BUSY                1
  57 #define MIP_SPIN                0xf0000
  58 #define MIP_VALID               0x0100000000000000ULL
  59 #define MIP_PORT(VALUE) ((VALUE >> 32) & 0xffff)
  60
  61 #define MIP_RD_LO(VALUE)        (VALUE & 0xffffffff)
  62
  63 struct mip_reg_info {
  64         unsigned long long mip_info;
  65         unsigned long long delivery_info;
  66         unsigned long long host_reg;
  67         unsigned long long mip_reg;
  68 };
  69
  70 struct part_info {
  71         unsigned char type;
  72         unsigned char length;
  73         unsigned char part_id;
  74         unsigned char apic_mode;
  75         unsigned long snum;
  76         char ptype[16];
  77         char sname[64];
  78         char pname[64];
  79 };
  80
  81 struct psai {
  82         unsigned long long entry_type;
  83         unsigned long long addr;
  84         unsigned long long bep_addr;
  85 };
  86
  87 struct es7000_mem_info {
  88         unsigned char type;
  89         unsigned char length;
  90         unsigned char resv[6];
  91         unsigned long long  start;
  92         unsigned long long  size;
  93 };
  94
  95 struct es7000_oem_table {
  96         unsigned long long hdr;
  97         struct mip_reg_info mip;
  98         struct part_info pif;
  99         struct es7000_mem_info shm;
 100         struct psai psai;
 101 };
 102
 103 #ifdef CONFIG_ACPI
 104
 105 struct oem_table {
 106         struct acpi_table_header Header;
 107         u32 OEMTableAddr;
 108         u32 OEMTableSize;
 109 };
 110
 111 extern int find_unisys_acpi_oem_table(unsigned long *oem_addr);
 112 #endif
 113
 114 struct mip_reg {
 115         unsigned long long off_0;
 116         unsigned long long off_8;
 117         unsigned long long off_10;
 118         unsigned long long off_18;
 119         unsigned long long off_20;
 120         unsigned long long off_28;
 121         unsigned long long off_30;
 122         unsigned long long off_38;
 123 };
 124
 125 #define MIP_SW_APIC             0x1020b
 126 #define MIP_FUNC(VALUE)         (VALUE & 0xff)
 127
 128 /*
 129  * ES7000 Globals
 130  */
 131
 132 static volatile unsigned long   *psai = NULL;
 133 static struct mip_reg           *mip_reg;
 134 static struct mip_reg           *host_reg;
 135 static int                      mip_port;
 136 static unsigned long            mip_addr, host_addr;
 137
 138 int es7000_plat;
 139
 140 /*
 141  * GSI override for ES7000 platforms.
 142  */
 143
 144 static unsigned int base;
 145
 146 static int
 147 es7000_rename_gsi(int ioapic, int gsi)
 148 {
 149         if (es7000_plat == ES7000_ZORRO)
 150                 return gsi;
 151
 152         if (!base) {
 153                 int i;
 154                 for (i = 0; i < nr_ioapics; i++)
 155                         base += nr_ioapic_registers[i];
 156         }
 157
 158         if (!ioapic && (gsi < 16))
 159                 gsi += base;
 160         return gsi;
 161 }
 162
 163 void __init
 164 setup_unisys(void)
 165 {
 166         /*
 167          * Determine the generation of the ES7000 currently running.
 168          *
 169          * es7000_plat = 1 if the machine is a 5xx ES7000 box
 170          * es7000_plat = 2 if the machine is a x86_64 ES7000 box
 171          *
 172          */
 173         if (!(boot_cpu_data.x86 <= 15 && boot_cpu_data.x86_model <= 2))
 174                 es7000_plat = ES7000_ZORRO;
 175         else
 176                 es7000_plat = ES7000_CLASSIC;
 177         ioapic_renumber_irq = es7000_rename_gsi;
 178 }
 179
 180 /*
 181  * Parse the OEM Table
 182  */
 183
 184 int __init
 185 parse_unisys_oem (char *oemptr)
 186 {
 187         int                     i;
 188         int                     success = 0;
 189         unsigned char           type, size;
 190         unsigned long           val;
 191         char                    *tp = NULL;
 192         struct psai             *psaip = NULL;
 193         struct mip_reg_info     *mi;
 194         struct mip_reg          *host, *mip;
 195
 196         tp = oemptr;
 197
 198         tp += 8;
 199
 200         for (i=0; i <= 6; i++) {
 201                 type = *tp++;
 202                 size = *tp++;
 203                 tp -= 2;
 204                 switch (type) {
 205                 case MIP_REG:
 206                         mi = (struct mip_reg_info *)tp;
 207                         val = MIP_RD_LO(mi->host_reg);
 208                         host_addr = val;
 209                         host = (struct mip_reg *)val;
 210                         host_reg = __va(host);
 211                         val = MIP_RD_LO(mi->mip_reg);
 212                         mip_port = MIP_PORT(mi->mip_info);
 213                         mip_addr = val;
 214                         mip = (struct mip_reg *)val;
 215                         mip_reg = __va(mip);
 216                         pr_debug("es7000_mipcfg: host_reg = 0x%lx \n",
 217                                  (unsigned long)host_reg);
 218                         pr_debug("es7000_mipcfg: mip_reg = 0x%lx \n",
 219                                  (unsigned long)mip_reg);
 220                         success++;
 221                         break;
 222                 case MIP_PSAI_REG:
 223                         psaip = (struct psai *)tp;
 224                         if (tp != NULL) {
 225                                 if (psaip->addr)
 226                                         psai = __va(psaip->addr);
 227                                 else
 228                                         psai = NULL;
 229                                 success++;
 230                         }
 231                         break;
 232                 default:
 233                         break;
 234                 }
 235                 tp += size;
 236         }
 237
 238         if (success < 2) {
 239                 es7000_plat = NON_UNISYS;
 240         } else
 241                 setup_unisys();
 242         return es7000_plat;
 243 }
 244
 245 #ifdef CONFIG_ACPI
 246 int __init
 247 find_unisys_acpi_oem_table(unsigned long *oem_addr)
 248 {
 249         struct acpi_table_header *header = NULL;
 250         int i = 0;
 251         while (ACPI_SUCCESS(acpi_get_table("OEM1", i++, &header))) {
 252                 if (!memcmp((char *) &header->oem_id, "UNISYS", 6)) {
 253                         struct oem_table *t = (struct oem_table *)header;
 254                         *oem_addr = (unsigned long)__acpi_map_table(t->OEMTableAddr,
 255                                                                     t->OEMTableSize);
 256                         return 0;
 257                 }
 258         }
 259         return -1;
 260 }
 261 #endif
 262
 263 static void
 264 es7000_spin(int n)
 265 {
 266         int i = 0;
 267
 268         while (i++ < n)
 269                 rep_nop();
 270 }
 271
 272 static int __init
 273 es7000_mip_write(struct mip_reg *mip_reg)
 274 {
 275         int                     status = 0;
 276         int                     spin;
 277
 278         spin = MIP_SPIN;
 279         while (((unsigned long long)host_reg->off_38 &
 280                 (unsigned long long)MIP_VALID) != 0) {
 281                         if (--spin <= 0) {
 282                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 283                                 return -1;
 284                         }
 285                 es7000_spin(MIP_SPIN);
 286         }
 287
 288         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 289         outb(1, mip_port);
 290
 291         spin = MIP_SPIN;
 292
 293         while (((unsigned long long)mip_reg->off_38 &
 294                 (unsigned long long)MIP_VALID) == 0) {
 295                 if (--spin <= 0) {
 296                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 297                         return -1;
 298                 }
 299                 es7000_spin(MIP_SPIN);
 300         }
 301
 302         status = ((unsigned long long)mip_reg->off_0 &
 303                 (unsigned long long)0xffff0000000000ULL) >> 48;
 304         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 305                 (unsigned long long)~MIP_VALID);
 306         return status;
 307 }
 308
 309 int
 310 es7000_start_cpu(int cpu, unsigned long eip)
 311 {
 312         unsigned long vect = 0, psaival = 0;
 313
 314         if (psai == NULL)
 315                 return -1;
 316
 317         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 318         psaival = (0x1000000 | vect | cpu);
 319
 320         while (*psai & 0x1000000)
 321                 ;
 322
 323         *psai = psaival;
 324
 325         return 0;
 326
 327 }
 328
 329 void __init
 330 es7000_sw_apic(void)
 331 {
 332         if (es7000_plat) {
 333                 int mip_status;
 334                 struct mip_reg es7000_mip_reg;
 335
 336                 printk("ES7000: Enabling APIC mode.\n");
 337                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 338                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 339                 es7000_mip_reg.off_38 = (MIP_VALID);
 340                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 341                         printk("es7000_sw_apic: command failed, status = %x\n",
 342                                 mip_status);
 343                 return;
 344         }
 345 }