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/atomic.h>
  42 #include <asm/apicdef.h>
  43 #include <mach_mpparse.h>
  44 #include <asm/genapic.h>
  45 #include <asm/setup.h>
  46
  47 /*
  48  * ES7000 chipsets
  49  */
  50
  51 #define NON_UNISYS              0
  52 #define ES7000_CLASSIC          1
  53 #define ES7000_ZORRO            2
  54
  55
  56 #define MIP_REG                 1
  57 #define MIP_PSAI_REG            4
  58
  59 #define MIP_BUSY                1
  60 #define MIP_SPIN                0xf0000
  61 #define MIP_VALID               0x0100000000000000ULL
  62 #define MIP_PORT(VALUE) ((VALUE >> 32) & 0xffff)
  63
  64 #define MIP_RD_LO(VALUE)        (VALUE & 0xffffffff)
  65
  66 struct mip_reg_info {
  67         unsigned long long mip_info;
  68         unsigned long long delivery_info;
  69         unsigned long long host_reg;
  70         unsigned long long mip_reg;
  71 };
  72
  73 struct part_info {
  74         unsigned char type;
  75         unsigned char length;
  76         unsigned char part_id;
  77         unsigned char apic_mode;
  78         unsigned long snum;
  79         char ptype[16];
  80         char sname[64];
  81         char pname[64];
  82 };
  83
  84 struct psai {
  85         unsigned long long entry_type;
  86         unsigned long long addr;
  87         unsigned long long bep_addr;
  88 };
  89
  90 struct es7000_mem_info {
  91         unsigned char type;
  92         unsigned char length;
  93         unsigned char resv[6];
  94         unsigned long long  start;
  95         unsigned long long  size;
  96 };
  97
  98 struct es7000_oem_table {
  99         unsigned long long hdr;
 100         struct mip_reg_info mip;
 101         struct part_info pif;
 102         struct es7000_mem_info shm;
 103         struct psai psai;
 104 };
 105
 106 #ifdef CONFIG_ACPI
 107
 108 struct oem_table {
 109         struct acpi_table_header Header;
 110         u32 OEMTableAddr;
 111         u32 OEMTableSize;
 112 };
 113
 114 extern int find_unisys_acpi_oem_table(unsigned long *oem_addr);
 115 extern void unmap_unisys_acpi_oem_table(unsigned long oem_addr);
 116 #endif
 117
 118 struct mip_reg {
 119         unsigned long long off_0;
 120         unsigned long long off_8;
 121         unsigned long long off_10;
 122         unsigned long long off_18;
 123         unsigned long long off_20;
 124         unsigned long long off_28;
 125         unsigned long long off_30;
 126         unsigned long long off_38;
 127 };
 128
 129 #define MIP_SW_APIC             0x1020b
 130 #define MIP_FUNC(VALUE)         (VALUE & 0xff)
 131
 132 /*
 133  * ES7000 Globals
 134  */
 135
 136 static volatile unsigned long   *psai = NULL;
 137 static struct mip_reg           *mip_reg;
 138 static struct mip_reg           *host_reg;
 139 static int                      mip_port;
 140 static unsigned long            mip_addr, host_addr;
 141
 142 int es7000_plat;
 143
 144 /*
 145  * GSI override for ES7000 platforms.
 146  */
 147
 148 static unsigned int base;
 149
 150 static int
 151 es7000_rename_gsi(int ioapic, int gsi)
 152 {
 153         if (es7000_plat == ES7000_ZORRO)
 154                 return gsi;
 155
 156         if (!base) {
 157                 int i;
 158                 for (i = 0; i < nr_ioapics; i++)
 159                         base += nr_ioapic_registers[i];
 160         }
 161
 162         if (!ioapic && (gsi < 16))
 163                 gsi += base;
 164         return gsi;
 165 }
 166
 167 static int wakeup_secondary_cpu_via_mip(int cpu, unsigned long eip)
 168 {
 169         unsigned long vect = 0, psaival = 0;
 170
 171         if (psai == NULL)
 172                 return -1;
 173
 174         vect = ((unsigned long)__pa(eip)/0x1000) << 16;
 175         psaival = (0x1000000 | vect | cpu);
 176
 177         while (*psai & 0x1000000)
 178                 ;
 179
 180         *psai = psaival;
 181
 182         return 0;
 183 }
 184
 185 static void noop_wait_for_deassert(atomic_t *deassert_not_used)
 186 {
 187 }
 188
 189 static int __init es7000_update_genapic(void)
 190 {
 191         genapic->wakeup_cpu = wakeup_secondary_cpu_via_mip;
 192
 193         /* MPENTIUMIII */
 194         if (boot_cpu_data.x86 == 6 &&
 195             (boot_cpu_data.x86_model >= 7 || boot_cpu_data.x86_model <= 11)) {
 196                 es7000_update_genapic_to_cluster();
 197                 genapic->wait_for_init_deassert = noop_wait_for_deassert;
 198                 genapic->wakeup_cpu = wakeup_secondary_cpu_via_mip;
 199         }
 200
 201         return 0;
 202 }
 203
 204 void __init
 205 setup_unisys(void)
 206 {
 207         /*
 208          * Determine the generation of the ES7000 currently running.
 209          *
 210          * es7000_plat = 1 if the machine is a 5xx ES7000 box
 211          * es7000_plat = 2 if the machine is a x86_64 ES7000 box
 212          *
 213          */
 214         if (!(boot_cpu_data.x86 <= 15 && boot_cpu_data.x86_model <= 2))
 215                 es7000_plat = ES7000_ZORRO;
 216         else
 217                 es7000_plat = ES7000_CLASSIC;
 218         ioapic_renumber_irq = es7000_rename_gsi;
 219
 220         x86_quirks->update_genapic = es7000_update_genapic;
 221 }
 222
 223 /*
 224  * Parse the OEM Table
 225  */
 226
 227 int __init
 228 parse_unisys_oem (char *oemptr)
 229 {
 230         int                     i;
 231         int                     success = 0;
 232         unsigned char           type, size;
 233         unsigned long           val;
 234         char                    *tp = NULL;
 235         struct psai             *psaip = NULL;
 236         struct mip_reg_info     *mi;
 237         struct mip_reg          *host, *mip;
 238
 239         tp = oemptr;
 240
 241         tp += 8;
 242
 243         for (i=0; i <= 6; i++) {
 244                 type = *tp++;
 245                 size = *tp++;
 246                 tp -= 2;
 247                 switch (type) {
 248                 case MIP_REG:
 249                         mi = (struct mip_reg_info *)tp;
 250                         val = MIP_RD_LO(mi->host_reg);
 251                         host_addr = val;
 252                         host = (struct mip_reg *)val;
 253                         host_reg = __va(host);
 254                         val = MIP_RD_LO(mi->mip_reg);
 255                         mip_port = MIP_PORT(mi->mip_info);
 256                         mip_addr = val;
 257                         mip = (struct mip_reg *)val;
 258                         mip_reg = __va(mip);
 259                         pr_debug("es7000_mipcfg: host_reg = 0x%lx \n",
 260                                  (unsigned long)host_reg);
 261                         pr_debug("es7000_mipcfg: mip_reg = 0x%lx \n",
 262                                  (unsigned long)mip_reg);
 263                         success++;
 264                         break;
 265                 case MIP_PSAI_REG:
 266                         psaip = (struct psai *)tp;
 267                         if (tp != NULL) {
 268                                 if (psaip->addr)
 269                                         psai = __va(psaip->addr);
 270                                 else
 271                                         psai = NULL;
 272                                 success++;
 273                         }
 274                         break;
 275                 default:
 276                         break;
 277                 }
 278                 tp += size;
 279         }
 280
 281         if (success < 2) {
 282                 es7000_plat = NON_UNISYS;
 283         } else
 284                 setup_unisys();
 285         return es7000_plat;
 286 }
 287
 288 #ifdef CONFIG_ACPI
 289 static unsigned long oem_addrX;
 290 static unsigned long oem_size;
 291 int __init find_unisys_acpi_oem_table(unsigned long *oem_addr)
 292 {
 293         struct acpi_table_header *header = NULL;
 294         int i = 0;
 295
 296         while (ACPI_SUCCESS(acpi_get_table("OEM1", i++, &header))) {
 297                 if (!memcmp((char *) &header->oem_id, "UNISYS", 6)) {
 298                         struct oem_table *t = (struct oem_table *)header;
 299
 300                         oem_addrX = t->OEMTableAddr;
 301                         oem_size = t->OEMTableSize;
 302
 303                         *oem_addr = (unsigned long)__acpi_map_table(oem_addrX,
 304                                                                     oem_size);
 305                         return 0;
 306                 }
 307         }
 308         return -1;
 309 }
 310
 311 void __init unmap_unisys_acpi_oem_table(unsigned long oem_addr)
 312 {
 313 }
 314 #endif
 315
 316 static void
 317 es7000_spin(int n)
 318 {
 319         int i = 0;
 320
 321         while (i++ < n)
 322                 rep_nop();
 323 }
 324
 325 static int __init
 326 es7000_mip_write(struct mip_reg *mip_reg)
 327 {
 328         int                     status = 0;
 329         int                     spin;
 330
 331         spin = MIP_SPIN;
 332         while (((unsigned long long)host_reg->off_38 &
 333                 (unsigned long long)MIP_VALID) != 0) {
 334                         if (--spin <= 0) {
 335                                 printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
 336                                 return -1;
 337                         }
 338                 es7000_spin(MIP_SPIN);
 339         }
 340
 341         memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
 342         outb(1, mip_port);
 343
 344         spin = MIP_SPIN;
 345
 346         while (((unsigned long long)mip_reg->off_38 &
 347                 (unsigned long long)MIP_VALID) == 0) {
 348                 if (--spin <= 0) {
 349                         printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
 350                         return -1;
 351                 }
 352                 es7000_spin(MIP_SPIN);
 353         }
 354
 355         status = ((unsigned long long)mip_reg->off_0 &
 356                 (unsigned long long)0xffff0000000000ULL) >> 48;
 357         mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
 358                 (unsigned long long)~MIP_VALID);
 359         return status;
 360 }
 361
 362 void __init
 363 es7000_sw_apic(void)
 364 {
 365         if (es7000_plat) {
 366                 int mip_status;
 367                 struct mip_reg es7000_mip_reg;
 368
 369                 printk("ES7000: Enabling APIC mode.\n");
 370                 memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
 371                 es7000_mip_reg.off_0 = MIP_SW_APIC;
 372                 es7000_mip_reg.off_38 = (MIP_VALID);
 373                 while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
 374                         printk("es7000_sw_apic: command failed, status = %x\n",
 375                                 mip_status);
 376                 return;
 377         }
 378 }