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   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 "xics.h"
  62 #include <asm/firmware.h>
  63 #include <asm/pmc.h>
  64 #include <asm/mpic.h>
  65 #include <asm/ppc-pci.h>
  66 #include <asm/i8259.h>
  67 #include <asm/udbg.h>
  68
  69 #include "plpar_wrappers.h"
  70
  71 #ifdef DEBUG
  72 #define DBG(fmt...) udbg_printf(fmt)
  73 #else
  74 #define DBG(fmt...)
  75 #endif
  76
  77 extern void find_udbg_vterm(void);
  78 extern void system_reset_fwnmi(void);   /* from head.S */
  79 extern void machine_check_fwnmi(void);  /* from head.S */
  80 extern void generic_find_legacy_serial_ports(u64 *physport,
  81                 unsigned int *default_speed);
  82
  83 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  84
  85 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  86 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  87
  88 static void pseries_shared_idle(void);
  89 static void pseries_dedicated_idle(void);
  90
  91 struct mpic *pSeries_mpic;
  92
  93 void pSeries_show_cpuinfo(struct seq_file *m)
  94 {
  95         struct device_node *root;
  96         const char *model = "";
  97
  98         root = of_find_node_by_path("/");
  99         if (root)
 100                 model = get_property(root, "model", NULL);
 101         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 102         of_node_put(root);
 103 }
 104
 105 /* Initialize firmware assisted non-maskable interrupts if
 106  * the firmware supports this feature.
 107  *
 108  */
 109 static void __init fwnmi_init(void)
 110 {
 111         int ret;
 112         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 113         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 114                 return;
 115         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 116                         __pa((unsigned long)system_reset_fwnmi),
 117                         __pa((unsigned long)machine_check_fwnmi));
 118         if (ret == 0)
 119                 fwnmi_active = 1;
 120 }
 121
 122 static void __init pSeries_init_mpic(void)
 123 {
 124         unsigned int *addrp;
 125         struct device_node *np;
 126         unsigned long intack = 0;
 127
 128         /* All ISUs are setup, complete initialization */
 129         mpic_init(pSeries_mpic);
 130
 131         /* Check what kind of cascade ACK we have */
 132         if (!(np = of_find_node_by_name(NULL, "pci"))
 133             || !(addrp = (unsigned int *)
 134                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 135                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 136         else
 137                 intack = addrp[prom_n_addr_cells(np)-1];
 138         of_node_put(np);
 139
 140         /* Setup the legacy interrupts & controller */
 141         i8259_init(intack, 0);
 142
 143         /* Hook cascade to mpic */
 144         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 145 }
 146
 147 static void __init pSeries_setup_mpic(void)
 148 {
 149         unsigned int *opprop;
 150         unsigned long openpic_addr = 0;
 151         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 152         struct device_node *root;
 153         int irq_count;
 154
 155         /* Find the Open PIC if present */
 156         root = of_find_node_by_path("/");
 157         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 158         if (opprop != 0) {
 159                 int n = prom_n_addr_cells(root);
 160
 161                 for (openpic_addr = 0; n > 0; --n)
 162                         openpic_addr = (openpic_addr << 32) + *opprop++;
 163                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 164         }
 165         of_node_put(root);
 166
 167         BUG_ON(openpic_addr == 0);
 168
 169         /* Get the sense values from OF */
 170         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 171
 172         /* Setup the openpic driver */
 173         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 174         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 175                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 176                                   NR_IRQS - 4, /* ipi offset */
 177                                   senses, irq_count, /* sense & sense size */
 178                                   " MPIC     ");
 179 }
 180
 181 static void pseries_lpar_enable_pmcs(void)
 182 {
 183         unsigned long set, reset;
 184
 185         power4_enable_pmcs();
 186
 187         set = 1UL << 63;
 188         reset = 0;
 189         plpar_hcall_norets(H_PERFMON, set, reset);
 190
 191         /* instruct hypervisor to maintain PMCs */
 192         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 193                 get_paca()->lppaca.pmcregs_in_use = 1;
 194 }
 195
 196 static void __init pSeries_setup_arch(void)
 197 {
 198         /* Fixup ppc_md depending on the type of interrupt controller */
 199         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 200                 ppc_md.init_IRQ       = pSeries_init_mpic;
 201                 ppc_md.get_irq        = mpic_get_irq;
 202                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
 203                 /* Allocate the mpic now, so that find_and_init_phbs() can
 204                  * fill the ISUs */
 205                 pSeries_setup_mpic();
 206         } else {
 207                 ppc_md.init_IRQ       = xics_init_IRQ;
 208                 ppc_md.get_irq        = xics_get_irq;
 209                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
 210         }
 211
 212 #ifdef CONFIG_SMP
 213         smp_init_pSeries();
 214 #endif
 215         /* openpic global configuration register (64-bit format). */
 216         /* openpic Interrupt Source Unit pointer (64-bit format). */
 217         /* python0 facility area (mmio) (64-bit format) REAL address. */
 218
 219         /* init to some ~sane value until calibrate_delay() runs */
 220         loops_per_jiffy = 50000000;
 221
 222         if (ROOT_DEV == 0) {
 223                 printk("No ramdisk, default root is /dev/sda2\n");
 224                 ROOT_DEV = Root_SDA2;
 225         }
 226
 227         fwnmi_init();
 228
 229         /* Find and initialize PCI host bridges */
 230         init_pci_config_tokens();
 231         find_and_init_phbs();
 232         eeh_init();
 233
 234         pSeries_nvram_init();
 235
 236         /* Choose an idle loop */
 237         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 238                 vpa_init(boot_cpuid);
 239                 if (get_paca()->lppaca.shared_proc) {
 240                         printk(KERN_INFO "Using shared processor idle loop\n");
 241                         ppc_md.idle_loop = pseries_shared_idle;
 242                 } else {
 243                         printk(KERN_INFO "Using dedicated idle loop\n");
 244                         ppc_md.idle_loop = pseries_dedicated_idle;
 245                 }
 246         } else {
 247                 printk(KERN_INFO "Using default idle loop\n");
 248                 ppc_md.idle_loop = default_idle;
 249         }
 250
 251         if (systemcfg->platform & PLATFORM_LPAR)
 252                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 253         else
 254                 ppc_md.enable_pmcs = power4_enable_pmcs;
 255 }
 256
 257 static int __init pSeries_init_panel(void)
 258 {
 259         /* Manually leave the kernel version on the panel. */
 260         ppc_md.progress("Linux ppc64\n", 0);
 261         ppc_md.progress(system_utsname.version, 0);
 262
 263         return 0;
 264 }
 265 arch_initcall(pSeries_init_panel);
 266
 267
 268 /* Build up the ppc64_firmware_features bitmask field
 269  * using contents of device-tree/ibm,hypertas-functions.
 270  * Ultimately this functionality may be moved into prom.c prom_init().
 271  */
 272 static void __init fw_feature_init(void)
 273 {
 274         struct device_node * dn;
 275         char * hypertas;
 276         unsigned int len;
 277
 278         DBG(" -> fw_feature_init()\n");
 279
 280         ppc64_firmware_features = 0;
 281         dn = of_find_node_by_path("/rtas");
 282         if (dn == NULL) {
 283                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 284                 goto no_rtas;
 285         }
 286
 287         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 288         if (hypertas) {
 289                 while (len > 0){
 290                         int i, hypertas_len;
 291                         /* check value against table of strings */
 292                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 293                                 if ((firmware_features_table[i].name) &&
 294                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 295                                         /* we have a match */
 296                                         ppc64_firmware_features |=
 297                                                 (firmware_features_table[i].val);
 298                                         break;
 299                                 }
 300                         }
 301                         hypertas_len = strlen(hypertas);
 302                         len -= hypertas_len +1;
 303                         hypertas+= hypertas_len +1;
 304                 }
 305         }
 306
 307         of_node_put(dn);
 308  no_rtas:
 309         printk(KERN_INFO "firmware_features = 0x%lx\n",
 310                ppc64_firmware_features);
 311
 312         DBG(" <- fw_feature_init()\n");
 313 }
 314
 315
 316 static  void __init pSeries_discover_pic(void)
 317 {
 318         struct device_node *np;
 319         char *typep;
 320
 321         /*
 322          * Setup interrupt mapping options that are needed for finish_device_tree
 323          * to properly parse the OF interrupt tree & do the virtual irq mapping
 324          */
 325         __irq_offset_value = NUM_ISA_INTERRUPTS;
 326         ppc64_interrupt_controller = IC_INVALID;
 327         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 328                 typep = (char *)get_property(np, "compatible", NULL);
 329                 if (strstr(typep, "open-pic"))
 330                         ppc64_interrupt_controller = IC_OPEN_PIC;
 331                 else if (strstr(typep, "ppc-xicp"))
 332                         ppc64_interrupt_controller = IC_PPC_XIC;
 333                 else
 334                         printk("pSeries_discover_pic: failed to recognize"
 335                                " interrupt-controller\n");
 336                 break;
 337         }
 338 }
 339
 340 static void pSeries_mach_cpu_die(void)
 341 {
 342         local_irq_disable();
 343         idle_task_exit();
 344         /* Some hardware requires clearing the CPPR, while other hardware does not
 345          * it is safe either way
 346          */
 347         pSeriesLP_cppr_info(0, 0);
 348         rtas_stop_self();
 349         /* Should never get here... */
 350         BUG();
 351         for(;;);
 352 }
 353
 354 static int pseries_set_dabr(unsigned long dabr)
 355 {
 356         if (firmware_has_feature(FW_FEATURE_XDABR)) {
 357                 /* We want to catch accesses from kernel and userspace */
 358                 return plpar_set_xdabr(dabr, H_DABRX_KERNEL | H_DABRX_USER);
 359         }
 360
 361         return plpar_set_dabr(dabr);
 362 }
 363
 364
 365 /*
 366  * Early initialization.  Relocation is on but do not reference unbolted pages
 367  */
 368 static void __init pSeries_init_early(void)
 369 {
 370         void *comport;
 371         int iommu_off = 0;
 372         unsigned int default_speed;
 373         u64 physport;
 374
 375         DBG(" -> pSeries_init_early()\n");
 376
 377         fw_feature_init();
 378
 379         if (systemcfg->platform & PLATFORM_LPAR)
 380                 hpte_init_lpar();
 381         else {
 382                 hpte_init_native();
 383                 iommu_off = (of_chosen &&
 384                              get_property(of_chosen, "linux,iommu-off", NULL));
 385         }
 386
 387         generic_find_legacy_serial_ports(&physport, &default_speed);
 388
 389         if (systemcfg->platform & PLATFORM_LPAR)
 390                 find_udbg_vterm();
 391         else if (physport) {
 392                 /* Map the uart for udbg. */
 393                 comport = (void *)ioremap(physport, 16);
 394                 udbg_init_uart(comport, default_speed);
 395
 396                 DBG("Hello World !\n");
 397         }
 398
 399         if (firmware_has_feature(FW_FEATURE_XDABR | FW_FEATURE_DABR))
 400                 ppc_md.set_dabr = pseries_set_dabr;
 401
 402         iommu_init_early_pSeries();
 403
 404         pSeries_discover_pic();
 405
 406         DBG(" <- pSeries_init_early()\n");
 407 }
 408
 409
 410 static int pSeries_check_legacy_ioport(unsigned int baseport)
 411 {
 412         struct device_node *np;
 413
 414 #define I8042_DATA_REG  0x60
 415 #define FDC_BASE        0x3f0
 416
 417
 418         switch(baseport) {
 419         case I8042_DATA_REG:
 420                 np = of_find_node_by_type(NULL, "8042");
 421                 if (np == NULL)
 422                         return -ENODEV;
 423                 of_node_put(np);
 424                 break;
 425         case FDC_BASE:
 426                 np = of_find_node_by_type(NULL, "fdc");
 427                 if (np == NULL)
 428                         return -ENODEV;
 429                 of_node_put(np);
 430                 break;
 431         }
 432         return 0;
 433 }
 434
 435 /*
 436  * Called very early, MMU is off, device-tree isn't unflattened
 437  */
 438 extern struct machdep_calls pSeries_md;
 439
 440 static int __init pSeries_probe(int platform)
 441 {
 442         if (platform != PLATFORM_PSERIES &&
 443             platform != PLATFORM_PSERIES_LPAR)
 444                 return 0;
 445
 446         /* if we have some ppc_md fixups for LPAR to do, do
 447          * it here ...
 448          */
 449
 450         return 1;
 451 }
 452
 453 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 454
 455 static inline void dedicated_idle_sleep(unsigned int cpu)
 456 {
 457         struct paca_struct *ppaca = &paca[cpu ^ 1];
 458
 459         /* Only sleep if the other thread is not idle */
 460         if (!(ppaca->lppaca.idle)) {
 461                 local_irq_disable();
 462
 463                 /*
 464                  * We are about to sleep the thread and so wont be polling any
 465                  * more.
 466                  */
 467                 clear_thread_flag(TIF_POLLING_NRFLAG);
 468
 469                 /*
 470                  * SMT dynamic mode. Cede will result in this thread going
 471                  * dormant, if the partner thread is still doing work.  Thread
 472                  * wakes up if partner goes idle, an interrupt is presented, or
 473                  * a prod occurs.  Returning from the cede enables external
 474                  * interrupts.
 475                  */
 476                 if (!need_resched())
 477                         cede_processor();
 478                 else
 479                         local_irq_enable();
 480         } else {
 481                 /*
 482                  * Give the HV an opportunity at the processor, since we are
 483                  * not doing any work.
 484                  */
 485                 poll_pending();
 486         }
 487 }
 488
 489 static void pseries_dedicated_idle(void)
 490 {
 491         long oldval;
 492         struct paca_struct *lpaca = get_paca();
 493         unsigned int cpu = smp_processor_id();
 494         unsigned long start_snooze;
 495         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 496
 497         while (1) {
 498                 /*
 499                  * Indicate to the HV that we are idle. Now would be
 500                  * a good time to find other work to dispatch.
 501                  */
 502                 lpaca->lppaca.idle = 1;
 503
 504                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 505                 if (!oldval) {
 506                         set_thread_flag(TIF_POLLING_NRFLAG);
 507
 508                         start_snooze = __get_tb() +
 509                                 *smt_snooze_delay * tb_ticks_per_usec;
 510
 511                         while (!need_resched() && !cpu_is_offline(cpu)) {
 512                                 ppc64_runlatch_off();
 513
 514                                 /*
 515                                  * Go into low thread priority and possibly
 516                                  * low power mode.
 517                                  */
 518                                 HMT_low();
 519                                 HMT_very_low();
 520
 521                                 if (*smt_snooze_delay != 0 &&
 522                                     __get_tb() > start_snooze) {
 523                                         HMT_medium();
 524                                         dedicated_idle_sleep(cpu);
 525                                 }
 526
 527                         }
 528
 529                         HMT_medium();
 530                         clear_thread_flag(TIF_POLLING_NRFLAG);
 531                 } else {
 532                         set_need_resched();
 533                 }
 534
 535                 lpaca->lppaca.idle = 0;
 536                 ppc64_runlatch_on();
 537
 538                 schedule();
 539
 540                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 541                         cpu_die();
 542         }
 543 }
 544
 545 static void pseries_shared_idle(void)
 546 {
 547         struct paca_struct *lpaca = get_paca();
 548         unsigned int cpu = smp_processor_id();
 549
 550         while (1) {
 551                 /*
 552                  * Indicate to the HV that we are idle. Now would be
 553                  * a good time to find other work to dispatch.
 554                  */
 555                 lpaca->lppaca.idle = 1;
 556
 557                 while (!need_resched() && !cpu_is_offline(cpu)) {
 558                         local_irq_disable();
 559                         ppc64_runlatch_off();
 560
 561                         /*
 562                          * Yield the processor to the hypervisor.  We return if
 563                          * an external interrupt occurs (which are driven prior
 564                          * to returning here) or if a prod occurs from another
 565                          * processor. When returning here, external interrupts
 566                          * are enabled.
 567                          *
 568                          * Check need_resched() again with interrupts disabled
 569                          * to avoid a race.
 570                          */
 571                         if (!need_resched())
 572                                 cede_processor();
 573                         else
 574                                 local_irq_enable();
 575
 576                         HMT_medium();
 577                 }
 578
 579                 lpaca->lppaca.idle = 0;
 580                 ppc64_runlatch_on();
 581
 582                 schedule();
 583
 584                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 585                         cpu_die();
 586         }
 587 }
 588
 589 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 590 {
 591         if (systemcfg->platform & PLATFORM_LPAR)
 592                 return PCI_PROBE_DEVTREE;
 593         return PCI_PROBE_NORMAL;
 594 }
 595
 596 struct machdep_calls __initdata pSeries_md = {
 597         .probe                  = pSeries_probe,
 598         .setup_arch             = pSeries_setup_arch,
 599         .init_early             = pSeries_init_early,
 600         .show_cpuinfo           = pSeries_show_cpuinfo,
 601         .log_error              = pSeries_log_error,
 602         .pcibios_fixup          = pSeries_final_fixup,
 603         .pci_probe_mode         = pSeries_pci_probe_mode,
 604         .irq_bus_setup          = pSeries_irq_bus_setup,
 605         .restart                = rtas_restart,
 606         .power_off              = rtas_power_off,
 607         .halt                   = rtas_halt,
 608         .panic                  = rtas_os_term,
 609         .cpu_die                = pSeries_mach_cpu_die,
 610         .get_boot_time          = rtas_get_boot_time,
 611         .get_rtc_time           = rtas_get_rtc_time,
 612         .set_rtc_time           = rtas_set_rtc_time,
 613         .calibrate_decr         = generic_calibrate_decr,
 614         .progress               = rtas_progress,
 615         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 616         .system_reset_exception = pSeries_system_reset_exception,
 617         .machine_check_exception = pSeries_machine_check_exception,
 618 };