arch/ppc64/kernel/pSeries_setup.c

   1 /*
   2  *  linux/arch/ppc/kernel/setup.c
   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/version.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 <asm/xics.h>
  63 #include <asm/cputable.h>
  64
  65 #include "i8259.h"
  66 #include "mpic.h"
  67 #include "pci.h"
  68
  69 #ifdef DEBUG
  70 #define DBG(fmt...) udbg_printf(fmt)
  71 #else
  72 #define DBG(fmt...)
  73 #endif
  74
  75 extern void find_udbg_vterm(void);
  76 extern void system_reset_fwnmi(void);   /* from head.S */
  77 extern void machine_check_fwnmi(void);  /* from head.S */
  78 extern void generic_find_legacy_serial_ports(u64 *physport,
  79                 unsigned int *default_speed);
  80
  81 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  82
  83 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  84 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  85
  86 static int pseries_shared_idle(void);
  87 static int pseries_dedicated_idle(void);
  88
  89 static volatile void __iomem * chrp_int_ack_special;
  90 struct mpic *pSeries_mpic;
  91
  92 void pSeries_get_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 int pSeries_irq_cascade(struct pt_regs *regs, void *data)
 122 {
 123         if (chrp_int_ack_special)
 124                 return readb(chrp_int_ack_special);
 125         else
 126                 return i8259_irq(smp_processor_id());
 127 }
 128
 129 static void __init pSeries_init_mpic(void)
 130 {
 131         unsigned int *addrp;
 132         struct device_node *np;
 133         int i;
 134
 135         /* All ISUs are setup, complete initialization */
 136         mpic_init(pSeries_mpic);
 137
 138         /* Check what kind of cascade ACK we have */
 139         if (!(np = of_find_node_by_name(NULL, "pci"))
 140             || !(addrp = (unsigned int *)
 141                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 142                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 143         else
 144                 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
 145         of_node_put(np);
 146
 147         /* Setup the legacy interrupts & controller */
 148         for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
 149                 irq_desc[i].handler = &i8259_pic;
 150         i8259_init(0);
 151
 152         /* Hook cascade to mpic */
 153         mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
 154 }
 155
 156 static void __init pSeries_setup_mpic(void)
 157 {
 158         unsigned int *opprop;
 159         unsigned long openpic_addr = 0;
 160         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 161         struct device_node *root;
 162         int irq_count;
 163
 164         /* Find the Open PIC if present */
 165         root = of_find_node_by_path("/");
 166         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 167         if (opprop != 0) {
 168                 int n = prom_n_addr_cells(root);
 169
 170                 for (openpic_addr = 0; n > 0; --n)
 171                         openpic_addr = (openpic_addr << 32) + *opprop++;
 172                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 173         }
 174         of_node_put(root);
 175
 176         BUG_ON(openpic_addr == 0);
 177
 178         /* Get the sense values from OF */
 179         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 180
 181         /* Setup the openpic driver */
 182         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 183         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 184                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 185                                   NR_IRQS - 4, /* ipi offset */
 186                                   senses, irq_count, /* sense & sense size */
 187                                   " MPIC     ");
 188 }
 189
 190 static void __init pSeries_setup_arch(void)
 191 {
 192         /* Fixup ppc_md depending on the type of interrupt controller */
 193         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 194                 ppc_md.init_IRQ       = pSeries_init_mpic;
 195                 ppc_md.get_irq        = mpic_get_irq;
 196                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
 197                 /* Allocate the mpic now, so that find_and_init_phbs() can
 198                  * fill the ISUs */
 199                 pSeries_setup_mpic();
 200         } else {
 201                 ppc_md.init_IRQ       = xics_init_IRQ;
 202                 ppc_md.get_irq        = xics_get_irq;
 203                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
 204         }
 205
 206 #ifdef CONFIG_SMP
 207         smp_init_pSeries();
 208 #endif
 209         /* openpic global configuration register (64-bit format). */
 210         /* openpic Interrupt Source Unit pointer (64-bit format). */
 211         /* python0 facility area (mmio) (64-bit format) REAL address. */
 212
 213         /* init to some ~sane value until calibrate_delay() runs */
 214         loops_per_jiffy = 50000000;
 215
 216         if (ROOT_DEV == 0) {
 217                 printk("No ramdisk, default root is /dev/sda2\n");
 218                 ROOT_DEV = Root_SDA2;
 219         }
 220
 221         fwnmi_init();
 222
 223         /* Find and initialize PCI host bridges */
 224         init_pci_config_tokens();
 225         eeh_init();
 226         find_and_init_phbs();
 227
 228 #ifdef CONFIG_DUMMY_CONSOLE
 229         conswitchp = &dummy_con;
 230 #endif
 231
 232         pSeries_nvram_init();
 233
 234         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
 235                 vpa_init(boot_cpuid);
 236
 237         /* Choose an idle loop */
 238         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 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
 252 static int __init pSeries_init_panel(void)
 253 {
 254         /* Manually leave the kernel version on the panel. */
 255         ppc_md.progress("Linux ppc64\n", 0);
 256         ppc_md.progress(UTS_RELEASE, 0);
 257
 258         return 0;
 259 }
 260 arch_initcall(pSeries_init_panel);
 261
 262
 263 /* Build up the firmware_features bitmask field
 264  * using contents of device-tree/ibm,hypertas-functions.
 265  * Ultimately this functionality may be moved into prom.c prom_init().
 266  */
 267 void __init fw_feature_init(void)
 268 {
 269         struct device_node * dn;
 270         char * hypertas;
 271         unsigned int len;
 272
 273         DBG(" -> fw_feature_init()\n");
 274
 275         cur_cpu_spec->firmware_features = 0;
 276         dn = of_find_node_by_path("/rtas");
 277         if (dn == NULL) {
 278                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 279                 goto no_rtas;
 280         }
 281
 282         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 283         if (hypertas) {
 284                 while (len > 0){
 285                         int i, hypertas_len;
 286                         /* check value against table of strings */
 287                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 288                                 if ((firmware_features_table[i].name) &&
 289                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 290                                         /* we have a match */
 291                                         cur_cpu_spec->firmware_features |=
 292                                                 (firmware_features_table[i].val);
 293                                         break;
 294                                 }
 295                         }
 296                         hypertas_len = strlen(hypertas);
 297                         len -= hypertas_len +1;
 298                         hypertas+= hypertas_len +1;
 299                 }
 300         }
 301
 302         of_node_put(dn);
 303  no_rtas:
 304         printk(KERN_INFO "firmware_features = 0x%lx\n",
 305                cur_cpu_spec->firmware_features);
 306
 307         DBG(" <- fw_feature_init()\n");
 308 }
 309
 310
 311 static  void __init pSeries_discover_pic(void)
 312 {
 313         struct device_node *np;
 314         char *typep;
 315
 316         /*
 317          * Setup interrupt mapping options that are needed for finish_device_tree
 318          * to properly parse the OF interrupt tree & do the virtual irq mapping
 319          */
 320         __irq_offset_value = NUM_ISA_INTERRUPTS;
 321         ppc64_interrupt_controller = IC_INVALID;
 322         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 323                 typep = (char *)get_property(np, "compatible", NULL);
 324                 if (strstr(typep, "open-pic"))
 325                         ppc64_interrupt_controller = IC_OPEN_PIC;
 326                 else if (strstr(typep, "ppc-xicp"))
 327                         ppc64_interrupt_controller = IC_PPC_XIC;
 328                 else
 329                         printk("pSeries_discover_pic: failed to recognize"
 330                                " interrupt-controller\n");
 331                 break;
 332         }
 333 }
 334
 335 static void pSeries_mach_cpu_die(void)
 336 {
 337         local_irq_disable();
 338         idle_task_exit();
 339         /* Some hardware requires clearing the CPPR, while other hardware does not
 340          * it is safe either way
 341          */
 342         pSeriesLP_cppr_info(0, 0);
 343         rtas_stop_self();
 344         /* Should never get here... */
 345         BUG();
 346         for(;;);
 347 }
 348
 349
 350 /*
 351  * Early initialization.  Relocation is on but do not reference unbolted pages
 352  */
 353 static void __init pSeries_init_early(void)
 354 {
 355         void *comport;
 356         int iommu_off = 0;
 357         unsigned int default_speed;
 358         u64 physport;
 359
 360         DBG(" -> pSeries_init_early()\n");
 361
 362         fw_feature_init();
 363
 364         if (systemcfg->platform & PLATFORM_LPAR)
 365                 hpte_init_lpar();
 366         else {
 367                 hpte_init_native();
 368                 iommu_off = (of_chosen &&
 369                              get_property(of_chosen, "linux,iommu-off", NULL));
 370         }
 371
 372         generic_find_legacy_serial_ports(&physport, &default_speed);
 373
 374         if (systemcfg->platform & PLATFORM_LPAR)
 375                 find_udbg_vterm();
 376         else if (physport) {
 377                 /* Map the uart for udbg. */
 378                 comport = (void *)ioremap(physport, 16);
 379                 udbg_init_uart(comport, default_speed);
 380
 381                 ppc_md.udbg_putc = udbg_putc;
 382                 ppc_md.udbg_getc = udbg_getc;
 383                 ppc_md.udbg_getc_poll = udbg_getc_poll;
 384                 DBG("Hello World !\n");
 385         }
 386
 387
 388         iommu_init_early_pSeries();
 389
 390         pSeries_discover_pic();
 391
 392         DBG(" <- pSeries_init_early()\n");
 393 }
 394
 395
 396 static int pSeries_check_legacy_ioport(unsigned int baseport)
 397 {
 398         struct device_node *np;
 399
 400 #define I8042_DATA_REG  0x60
 401 #define FDC_BASE        0x3f0
 402
 403
 404         switch(baseport) {
 405         case I8042_DATA_REG:
 406                 np = of_find_node_by_type(NULL, "8042");
 407                 if (np == NULL)
 408                         return -ENODEV;
 409                 of_node_put(np);
 410                 break;
 411         case FDC_BASE:
 412                 np = of_find_node_by_type(NULL, "fdc");
 413                 if (np == NULL)
 414                         return -ENODEV;
 415                 of_node_put(np);
 416                 break;
 417         }
 418         return 0;
 419 }
 420
 421 /*
 422  * Called very early, MMU is off, device-tree isn't unflattened
 423  */
 424 extern struct machdep_calls pSeries_md;
 425
 426 static int __init pSeries_probe(int platform)
 427 {
 428         if (platform != PLATFORM_PSERIES &&
 429             platform != PLATFORM_PSERIES_LPAR)
 430                 return 0;
 431
 432         /* if we have some ppc_md fixups for LPAR to do, do
 433          * it here ...
 434          */
 435
 436         return 1;
 437 }
 438
 439 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 440
 441 static inline void dedicated_idle_sleep(unsigned int cpu)
 442 {
 443         struct paca_struct *ppaca = &paca[cpu ^ 1];
 444
 445         /* Only sleep if the other thread is not idle */
 446         if (!(ppaca->lppaca.idle)) {
 447                 local_irq_disable();
 448
 449                 /*
 450                  * We are about to sleep the thread and so wont be polling any
 451                  * more.
 452                  */
 453                 clear_thread_flag(TIF_POLLING_NRFLAG);
 454
 455                 /*
 456                  * SMT dynamic mode. Cede will result in this thread going
 457                  * dormant, if the partner thread is still doing work.  Thread
 458                  * wakes up if partner goes idle, an interrupt is presented, or
 459                  * a prod occurs.  Returning from the cede enables external
 460                  * interrupts.
 461                  */
 462                 if (!need_resched())
 463                         cede_processor();
 464                 else
 465                         local_irq_enable();
 466         } else {
 467                 /*
 468                  * Give the HV an opportunity at the processor, since we are
 469                  * not doing any work.
 470                  */
 471                 poll_pending();
 472         }
 473 }
 474
 475 static int pseries_dedicated_idle(void)
 476 {
 477         long oldval;
 478         struct paca_struct *lpaca = get_paca();
 479         unsigned int cpu = smp_processor_id();
 480         unsigned long start_snooze;
 481         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 482
 483         while (1) {
 484                 /*
 485                  * Indicate to the HV that we are idle. Now would be
 486                  * a good time to find other work to dispatch.
 487                  */
 488                 lpaca->lppaca.idle = 1;
 489
 490                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 491                 if (!oldval) {
 492                         set_thread_flag(TIF_POLLING_NRFLAG);
 493
 494                         start_snooze = __get_tb() +
 495                                 *smt_snooze_delay * tb_ticks_per_usec;
 496
 497                         while (!need_resched() && !cpu_is_offline(cpu)) {
 498                                 ppc64_runlatch_off();
 499
 500                                 /*
 501                                  * Go into low thread priority and possibly
 502                                  * low power mode.
 503                                  */
 504                                 HMT_low();
 505                                 HMT_very_low();
 506
 507                                 if (*smt_snooze_delay != 0 &&
 508                                     __get_tb() > start_snooze) {
 509                                         HMT_medium();
 510                                         dedicated_idle_sleep(cpu);
 511                                 }
 512
 513                         }
 514
 515                         HMT_medium();
 516                         clear_thread_flag(TIF_POLLING_NRFLAG);
 517                 } else {
 518                         set_need_resched();
 519                 }
 520
 521                 lpaca->lppaca.idle = 0;
 522                 ppc64_runlatch_on();
 523
 524                 schedule();
 525
 526                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 527                         cpu_die();
 528         }
 529 }
 530
 531 static int pseries_shared_idle(void)
 532 {
 533         struct paca_struct *lpaca = get_paca();
 534         unsigned int cpu = smp_processor_id();
 535
 536         while (1) {
 537                 /*
 538                  * Indicate to the HV that we are idle. Now would be
 539                  * a good time to find other work to dispatch.
 540                  */
 541                 lpaca->lppaca.idle = 1;
 542
 543                 while (!need_resched() && !cpu_is_offline(cpu)) {
 544                         local_irq_disable();
 545                         ppc64_runlatch_off();
 546
 547                         /*
 548                          * Yield the processor to the hypervisor.  We return if
 549                          * an external interrupt occurs (which are driven prior
 550                          * to returning here) or if a prod occurs from another
 551                          * processor. When returning here, external interrupts
 552                          * are enabled.
 553                          *
 554                          * Check need_resched() again with interrupts disabled
 555                          * to avoid a race.
 556                          */
 557                         if (!need_resched())
 558                                 cede_processor();
 559                         else
 560                                 local_irq_enable();
 561
 562                         HMT_medium();
 563                 }
 564
 565                 lpaca->lppaca.idle = 0;
 566                 ppc64_runlatch_on();
 567
 568                 schedule();
 569
 570                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 571                         cpu_die();
 572         }
 573
 574         return 0;
 575 }
 576
 577 struct machdep_calls __initdata pSeries_md = {
 578         .probe                  = pSeries_probe,
 579         .setup_arch             = pSeries_setup_arch,
 580         .init_early             = pSeries_init_early,
 581         .get_cpuinfo            = pSeries_get_cpuinfo,
 582         .log_error              = pSeries_log_error,
 583         .pcibios_fixup          = pSeries_final_fixup,
 584         .irq_bus_setup          = pSeries_irq_bus_setup,
 585         .restart                = rtas_restart,
 586         .power_off              = rtas_power_off,
 587         .halt                   = rtas_halt,
 588         .panic                  = rtas_os_term,
 589         .cpu_die                = pSeries_mach_cpu_die,
 590         .get_boot_time          = rtas_get_boot_time,
 591         .get_rtc_time           = rtas_get_rtc_time,
 592         .set_rtc_time           = rtas_set_rtc_time,
 593         .calibrate_decr         = generic_calibrate_decr,
 594         .progress               = rtas_progress,
 595         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 596         .system_reset_exception = pSeries_system_reset_exception,
 597         .machine_check_exception = pSeries_machine_check_exception,
 598 };