arch/powerpc/platforms/pseries/setup.c

   1 /*
   2  *  64-bit pSeries and RS/6000 setup code.
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Adapted from 'alpha' version by Gary Thomas
   6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   7  *  Modified by PPC64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  * bootup setup stuff..
  17  */
  18
  19 #undef DEBUG
  20
  21 #include <linux/config.h>
  22 #include <linux/cpu.h>
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/stddef.h>
  28 #include <linux/unistd.h>
  29 #include <linux/slab.h>
  30 #include <linux/user.h>
  31 #include <linux/a.out.h>
  32 #include <linux/tty.h>
  33 #include <linux/major.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/reboot.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/console.h>
  39 #include <linux/pci.h>
  40 #include <linux/utsname.h>
  41 #include <linux/adb.h>
  42 #include <linux/module.h>
  43 #include <linux/delay.h>
  44 #include <linux/irq.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/root_dev.h>
  47
  48 #include <asm/mmu.h>
  49 #include <asm/processor.h>
  50 #include <asm/io.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/prom.h>
  53 #include <asm/rtas.h>
  54 #include <asm/pci-bridge.h>
  55 #include <asm/iommu.h>
  56 #include <asm/dma.h>
  57 #include <asm/machdep.h>
  58 #include <asm/irq.h>
  59 #include <asm/time.h>
  60 #include <asm/nvram.h>
  61 #include <asm/plpar_wrappers.h>
  62 #include "xics.h"
  63 #include <asm/firmware.h>
  64 #include <asm/pmc.h>
  65 #include <asm/mpic.h>
  66 #include <asm/ppc-pci.h>
  67 #include <asm/i8259.h>
  68 #include <asm/udbg.h>
  69
  70 #ifdef DEBUG
  71 #define DBG(fmt...) udbg_printf(fmt)
  72 #else
  73 #define DBG(fmt...)
  74 #endif
  75
  76 extern void find_udbg_vterm(void);
  77 extern void system_reset_fwnmi(void);   /* from head.S */
  78 extern void machine_check_fwnmi(void);  /* from head.S */
  79 extern void generic_find_legacy_serial_ports(u64 *physport,
  80                 unsigned int *default_speed);
  81
  82 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  83
  84 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  85 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  86
  87 static void pseries_shared_idle(void);
  88 static void pseries_dedicated_idle(void);
  89
  90 struct mpic *pSeries_mpic;
  91
  92 void pSeries_show_cpuinfo(struct seq_file *m)
  93 {
  94         struct device_node *root;
  95         const char *model = "";
  96
  97         root = of_find_node_by_path("/");
  98         if (root)
  99                 model = get_property(root, "model", NULL);
 100         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 101         of_node_put(root);
 102 }
 103
 104 /* Initialize firmware assisted non-maskable interrupts if
 105  * the firmware supports this feature.
 106  *
 107  */
 108 static void __init fwnmi_init(void)
 109 {
 110         int ret;
 111         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 112         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 113                 return;
 114         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 115                         __pa((unsigned long)system_reset_fwnmi),
 116                         __pa((unsigned long)machine_check_fwnmi));
 117         if (ret == 0)
 118                 fwnmi_active = 1;
 119 }
 120
 121 static void __init pSeries_init_mpic(void)
 122 {
 123         unsigned int *addrp;
 124         struct device_node *np;
 125         unsigned long intack = 0;
 126
 127         /* All ISUs are setup, complete initialization */
 128         mpic_init(pSeries_mpic);
 129
 130         /* Check what kind of cascade ACK we have */
 131         if (!(np = of_find_node_by_name(NULL, "pci"))
 132             || !(addrp = (unsigned int *)
 133                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 134                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 135         else
 136                 intack = addrp[prom_n_addr_cells(np)-1];
 137         of_node_put(np);
 138
 139         /* Setup the legacy interrupts & controller */
 140         i8259_init(intack, 0);
 141
 142         /* Hook cascade to mpic */
 143         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 144 }
 145
 146 static void __init pSeries_setup_mpic(void)
 147 {
 148         unsigned int *opprop;
 149         unsigned long openpic_addr = 0;
 150         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 151         struct device_node *root;
 152         int irq_count;
 153
 154         /* Find the Open PIC if present */
 155         root = of_find_node_by_path("/");
 156         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 157         if (opprop != 0) {
 158                 int n = prom_n_addr_cells(root);
 159
 160                 for (openpic_addr = 0; n > 0; --n)
 161                         openpic_addr = (openpic_addr << 32) + *opprop++;
 162                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 163         }
 164         of_node_put(root);
 165
 166         BUG_ON(openpic_addr == 0);
 167
 168         /* Get the sense values from OF */
 169         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 170
 171         /* Setup the openpic driver */
 172         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 173         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 174                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 175                                   NR_IRQS - 4, /* ipi offset */
 176                                   senses, irq_count, /* sense & sense size */
 177                                   " MPIC     ");
 178 }
 179
 180 static void pseries_lpar_enable_pmcs(void)
 181 {
 182         unsigned long set, reset;
 183
 184         power4_enable_pmcs();
 185
 186         set = 1UL << 63;
 187         reset = 0;
 188         plpar_hcall_norets(H_PERFMON, set, reset);
 189
 190         /* instruct hypervisor to maintain PMCs */
 191         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 192                 get_paca()->lppaca.pmcregs_in_use = 1;
 193 }
 194
 195 static void __init pSeries_setup_arch(void)
 196 {
 197         /* Fixup ppc_md depending on the type of interrupt controller */
 198         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 199                 ppc_md.init_IRQ       = pSeries_init_mpic;
 200                 ppc_md.get_irq        = mpic_get_irq;
 201                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
 202                 /* Allocate the mpic now, so that find_and_init_phbs() can
 203                  * fill the ISUs */
 204                 pSeries_setup_mpic();
 205         } else {
 206                 ppc_md.init_IRQ       = xics_init_IRQ;
 207                 ppc_md.get_irq        = xics_get_irq;
 208                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
 209         }
 210
 211 #ifdef CONFIG_SMP
 212         smp_init_pSeries();
 213 #endif
 214         /* openpic global configuration register (64-bit format). */
 215         /* openpic Interrupt Source Unit pointer (64-bit format). */
 216         /* python0 facility area (mmio) (64-bit format) REAL address. */
 217
 218         /* init to some ~sane value until calibrate_delay() runs */
 219         loops_per_jiffy = 50000000;
 220
 221         if (ROOT_DEV == 0) {
 222                 printk("No ramdisk, default root is /dev/sda2\n");
 223                 ROOT_DEV = Root_SDA2;
 224         }
 225
 226         fwnmi_init();
 227
 228         /* Find and initialize PCI host bridges */
 229         init_pci_config_tokens();
 230         find_and_init_phbs();
 231         eeh_init();
 232
 233         pSeries_nvram_init();
 234
 235         /* Choose an idle loop */
 236         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 237                 vpa_init(boot_cpuid);
 238                 if (get_paca()->lppaca.shared_proc) {
 239                         printk(KERN_INFO "Using shared processor idle loop\n");
 240                         ppc_md.idle_loop = pseries_shared_idle;
 241                 } else {
 242                         printk(KERN_INFO "Using dedicated idle loop\n");
 243                         ppc_md.idle_loop = pseries_dedicated_idle;
 244                 }
 245         } else {
 246                 printk(KERN_INFO "Using default idle loop\n");
 247                 ppc_md.idle_loop = default_idle;
 248         }
 249
 250         if (systemcfg->platform & PLATFORM_LPAR)
 251                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 252         else
 253                 ppc_md.enable_pmcs = power4_enable_pmcs;
 254 }
 255
 256 static int __init pSeries_init_panel(void)
 257 {
 258         /* Manually leave the kernel version on the panel. */
 259         ppc_md.progress("Linux ppc64\n", 0);
 260         ppc_md.progress(system_utsname.version, 0);
 261
 262         return 0;
 263 }
 264 arch_initcall(pSeries_init_panel);
 265
 266
 267 /* Build up the ppc64_firmware_features bitmask field
 268  * using contents of device-tree/ibm,hypertas-functions.
 269  * Ultimately this functionality may be moved into prom.c prom_init().
 270  */
 271 static void __init fw_feature_init(void)
 272 {
 273         struct device_node * dn;
 274         char * hypertas;
 275         unsigned int len;
 276
 277         DBG(" -> fw_feature_init()\n");
 278
 279         ppc64_firmware_features = 0;
 280         dn = of_find_node_by_path("/rtas");
 281         if (dn == NULL) {
 282                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 283                 goto no_rtas;
 284         }
 285
 286         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 287         if (hypertas) {
 288                 while (len > 0){
 289                         int i, hypertas_len;
 290                         /* check value against table of strings */
 291                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 292                                 if ((firmware_features_table[i].name) &&
 293                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 294                                         /* we have a match */
 295                                         ppc64_firmware_features |=
 296                                                 (firmware_features_table[i].val);
 297                                         break;
 298                                 }
 299                         }
 300                         hypertas_len = strlen(hypertas);
 301                         len -= hypertas_len +1;
 302                         hypertas+= hypertas_len +1;
 303                 }
 304         }
 305
 306         of_node_put(dn);
 307  no_rtas:
 308         printk(KERN_INFO "firmware_features = 0x%lx\n",
 309                ppc64_firmware_features);
 310
 311         DBG(" <- fw_feature_init()\n");
 312 }
 313
 314
 315 static  void __init pSeries_discover_pic(void)
 316 {
 317         struct device_node *np;
 318         char *typep;
 319
 320         /*
 321          * Setup interrupt mapping options that are needed for finish_device_tree
 322          * to properly parse the OF interrupt tree & do the virtual irq mapping
 323          */
 324         __irq_offset_value = NUM_ISA_INTERRUPTS;
 325         ppc64_interrupt_controller = IC_INVALID;
 326         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 327                 typep = (char *)get_property(np, "compatible", NULL);
 328                 if (strstr(typep, "open-pic"))
 329                         ppc64_interrupt_controller = IC_OPEN_PIC;
 330                 else if (strstr(typep, "ppc-xicp"))
 331                         ppc64_interrupt_controller = IC_PPC_XIC;
 332                 else
 333                         printk("pSeries_discover_pic: failed to recognize"
 334                                " interrupt-controller\n");
 335                 break;
 336         }
 337 }
 338
 339 static void pSeries_mach_cpu_die(void)
 340 {
 341         local_irq_disable();
 342         idle_task_exit();
 343         /* Some hardware requires clearing the CPPR, while other hardware does not
 344          * it is safe either way
 345          */
 346         pSeriesLP_cppr_info(0, 0);
 347         rtas_stop_self();
 348         /* Should never get here... */
 349         BUG();
 350         for(;;);
 351 }
 352
 353
 354 /*
 355  * Early initialization.  Relocation is on but do not reference unbolted pages
 356  */
 357 static void __init pSeries_init_early(void)
 358 {
 359         void *comport;
 360         int iommu_off = 0;
 361         unsigned int default_speed;
 362         u64 physport;
 363
 364         DBG(" -> pSeries_init_early()\n");
 365
 366         fw_feature_init();
 367
 368         if (systemcfg->platform & PLATFORM_LPAR)
 369                 hpte_init_lpar();
 370         else {
 371                 hpte_init_native();
 372                 iommu_off = (of_chosen &&
 373                              get_property(of_chosen, "linux,iommu-off", NULL));
 374         }
 375
 376         generic_find_legacy_serial_ports(&physport, &default_speed);
 377
 378         if (systemcfg->platform & PLATFORM_LPAR)
 379                 find_udbg_vterm();
 380         else if (physport) {
 381                 /* Map the uart for udbg. */
 382                 comport = (void *)ioremap(physport, 16);
 383                 udbg_init_uart(comport, default_speed);
 384
 385                 DBG("Hello World !\n");
 386         }
 387
 388
 389         iommu_init_early_pSeries();
 390
 391         pSeries_discover_pic();
 392
 393         DBG(" <- pSeries_init_early()\n");
 394 }
 395
 396
 397 static int pSeries_check_legacy_ioport(unsigned int baseport)
 398 {
 399         struct device_node *np;
 400
 401 #define I8042_DATA_REG  0x60
 402 #define FDC_BASE        0x3f0
 403
 404
 405         switch(baseport) {
 406         case I8042_DATA_REG:
 407                 np = of_find_node_by_type(NULL, "8042");
 408                 if (np == NULL)
 409                         return -ENODEV;
 410                 of_node_put(np);
 411                 break;
 412         case FDC_BASE:
 413                 np = of_find_node_by_type(NULL, "fdc");
 414                 if (np == NULL)
 415                         return -ENODEV;
 416                 of_node_put(np);
 417                 break;
 418         }
 419         return 0;
 420 }
 421
 422 /*
 423  * Called very early, MMU is off, device-tree isn't unflattened
 424  */
 425 extern struct machdep_calls pSeries_md;
 426
 427 static int __init pSeries_probe(int platform)
 428 {
 429         if (platform != PLATFORM_PSERIES &&
 430             platform != PLATFORM_PSERIES_LPAR)
 431                 return 0;
 432
 433         /* if we have some ppc_md fixups for LPAR to do, do
 434          * it here ...
 435          */
 436
 437         return 1;
 438 }
 439
 440 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 441
 442 static inline void dedicated_idle_sleep(unsigned int cpu)
 443 {
 444         struct paca_struct *ppaca = &paca[cpu ^ 1];
 445
 446         /* Only sleep if the other thread is not idle */
 447         if (!(ppaca->lppaca.idle)) {
 448                 local_irq_disable();
 449
 450                 /*
 451                  * We are about to sleep the thread and so wont be polling any
 452                  * more.
 453                  */
 454                 clear_thread_flag(TIF_POLLING_NRFLAG);
 455
 456                 /*
 457                  * SMT dynamic mode. Cede will result in this thread going
 458                  * dormant, if the partner thread is still doing work.  Thread
 459                  * wakes up if partner goes idle, an interrupt is presented, or
 460                  * a prod occurs.  Returning from the cede enables external
 461                  * interrupts.
 462                  */
 463                 if (!need_resched())
 464                         cede_processor();
 465                 else
 466                         local_irq_enable();
 467         } else {
 468                 /*
 469                  * Give the HV an opportunity at the processor, since we are
 470                  * not doing any work.
 471                  */
 472                 poll_pending();
 473         }
 474 }
 475
 476 static void pseries_dedicated_idle(void)
 477 {
 478         long oldval;
 479         struct paca_struct *lpaca = get_paca();
 480         unsigned int cpu = smp_processor_id();
 481         unsigned long start_snooze;
 482         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 483
 484         while (1) {
 485                 /*
 486                  * Indicate to the HV that we are idle. Now would be
 487                  * a good time to find other work to dispatch.
 488                  */
 489                 lpaca->lppaca.idle = 1;
 490
 491                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 492                 if (!oldval) {
 493                         set_thread_flag(TIF_POLLING_NRFLAG);
 494
 495                         start_snooze = __get_tb() +
 496                                 *smt_snooze_delay * tb_ticks_per_usec;
 497
 498                         while (!need_resched() && !cpu_is_offline(cpu)) {
 499                                 ppc64_runlatch_off();
 500
 501                                 /*
 502                                  * Go into low thread priority and possibly
 503                                  * low power mode.
 504                                  */
 505                                 HMT_low();
 506                                 HMT_very_low();
 507
 508                                 if (*smt_snooze_delay != 0 &&
 509                                     __get_tb() > start_snooze) {
 510                                         HMT_medium();
 511                                         dedicated_idle_sleep(cpu);
 512                                 }
 513
 514                         }
 515
 516                         HMT_medium();
 517                         clear_thread_flag(TIF_POLLING_NRFLAG);
 518                 } else {
 519                         set_need_resched();
 520                 }
 521
 522                 lpaca->lppaca.idle = 0;
 523                 ppc64_runlatch_on();
 524
 525                 schedule();
 526
 527                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 528                         cpu_die();
 529         }
 530 }
 531
 532 static void pseries_shared_idle(void)
 533 {
 534         struct paca_struct *lpaca = get_paca();
 535         unsigned int cpu = smp_processor_id();
 536
 537         while (1) {
 538                 /*
 539                  * Indicate to the HV that we are idle. Now would be
 540                  * a good time to find other work to dispatch.
 541                  */
 542                 lpaca->lppaca.idle = 1;
 543
 544                 while (!need_resched() && !cpu_is_offline(cpu)) {
 545                         local_irq_disable();
 546                         ppc64_runlatch_off();
 547
 548                         /*
 549                          * Yield the processor to the hypervisor.  We return if
 550                          * an external interrupt occurs (which are driven prior
 551                          * to returning here) or if a prod occurs from another
 552                          * processor. When returning here, external interrupts
 553                          * are enabled.
 554                          *
 555                          * Check need_resched() again with interrupts disabled
 556                          * to avoid a race.
 557                          */
 558                         if (!need_resched())
 559                                 cede_processor();
 560                         else
 561                                 local_irq_enable();
 562
 563                         HMT_medium();
 564                 }
 565
 566                 lpaca->lppaca.idle = 0;
 567                 ppc64_runlatch_on();
 568
 569                 schedule();
 570
 571                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 572                         cpu_die();
 573         }
 574 }
 575
 576 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 577 {
 578         if (systemcfg->platform & PLATFORM_LPAR)
 579                 return PCI_PROBE_DEVTREE;
 580         return PCI_PROBE_NORMAL;
 581 }
 582
 583 struct machdep_calls __initdata pSeries_md = {
 584         .probe                  = pSeries_probe,
 585         .setup_arch             = pSeries_setup_arch,
 586         .init_early             = pSeries_init_early,
 587         .show_cpuinfo           = pSeries_show_cpuinfo,
 588         .log_error              = pSeries_log_error,
 589         .pcibios_fixup          = pSeries_final_fixup,
 590         .pci_probe_mode         = pSeries_pci_probe_mode,
 591         .irq_bus_setup          = pSeries_irq_bus_setup,
 592         .restart                = rtas_fw_restart,
 593         .power_off              = rtas_fw_power_off,
 594         .halt                   = rtas_fw_halt,
 595         .panic                  = rtas_os_term,
 596         .cpu_die                = pSeries_mach_cpu_die,
 597         .get_boot_time          = rtas_get_boot_time,
 598         .get_rtc_time           = rtas_get_rtc_time,
 599         .set_rtc_time           = rtas_set_rtc_time,
 600         .calibrate_decr         = generic_calibrate_decr,
 601         .progress               = rtas_progress,
 602         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 603         .system_reset_exception = pSeries_system_reset_exception,
 604         .machine_check_exception = pSeries_machine_check_exception,
 605 };