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/firmware.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         /* Choose an idle loop */
 235         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 236                 vpa_init(boot_cpuid);
 237                 if (get_paca()->lppaca.shared_proc) {
 238                         printk(KERN_INFO "Using shared processor idle loop\n");
 239                         ppc_md.idle_loop = pseries_shared_idle;
 240                 } else {
 241                         printk(KERN_INFO "Using dedicated idle loop\n");
 242                         ppc_md.idle_loop = pseries_dedicated_idle;
 243                 }
 244         } else {
 245                 printk(KERN_INFO "Using default idle loop\n");
 246                 ppc_md.idle_loop = default_idle;
 247         }
 248 }
 249
 250 static int __init pSeries_init_panel(void)
 251 {
 252         /* Manually leave the kernel version on the panel. */
 253         ppc_md.progress("Linux ppc64\n", 0);
 254         ppc_md.progress(UTS_RELEASE, 0);
 255
 256         return 0;
 257 }
 258 arch_initcall(pSeries_init_panel);
 259
 260
 261 /* Build up the ppc64_firmware_features bitmask field
 262  * using contents of device-tree/ibm,hypertas-functions.
 263  * Ultimately this functionality may be moved into prom.c prom_init().
 264  */
 265 static void __init fw_feature_init(void)
 266 {
 267         struct device_node * dn;
 268         char * hypertas;
 269         unsigned int len;
 270
 271         DBG(" -> fw_feature_init()\n");
 272
 273         ppc64_firmware_features = 0;
 274         dn = of_find_node_by_path("/rtas");
 275         if (dn == NULL) {
 276                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 277                 goto no_rtas;
 278         }
 279
 280         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 281         if (hypertas) {
 282                 while (len > 0){
 283                         int i, hypertas_len;
 284                         /* check value against table of strings */
 285                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 286                                 if ((firmware_features_table[i].name) &&
 287                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 288                                         /* we have a match */
 289                                         ppc64_firmware_features |=
 290                                                 (firmware_features_table[i].val);
 291                                         break;
 292                                 }
 293                         }
 294                         hypertas_len = strlen(hypertas);
 295                         len -= hypertas_len +1;
 296                         hypertas+= hypertas_len +1;
 297                 }
 298         }
 299
 300         of_node_put(dn);
 301  no_rtas:
 302         printk(KERN_INFO "firmware_features = 0x%lx\n",
 303                ppc64_firmware_features);
 304
 305         DBG(" <- fw_feature_init()\n");
 306 }
 307
 308
 309 static  void __init pSeries_discover_pic(void)
 310 {
 311         struct device_node *np;
 312         char *typep;
 313
 314         /*
 315          * Setup interrupt mapping options that are needed for finish_device_tree
 316          * to properly parse the OF interrupt tree & do the virtual irq mapping
 317          */
 318         __irq_offset_value = NUM_ISA_INTERRUPTS;
 319         ppc64_interrupt_controller = IC_INVALID;
 320         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 321                 typep = (char *)get_property(np, "compatible", NULL);
 322                 if (strstr(typep, "open-pic"))
 323                         ppc64_interrupt_controller = IC_OPEN_PIC;
 324                 else if (strstr(typep, "ppc-xicp"))
 325                         ppc64_interrupt_controller = IC_PPC_XIC;
 326                 else
 327                         printk("pSeries_discover_pic: failed to recognize"
 328                                " interrupt-controller\n");
 329                 break;
 330         }
 331 }
 332
 333 static void pSeries_mach_cpu_die(void)
 334 {
 335         local_irq_disable();
 336         idle_task_exit();
 337         /* Some hardware requires clearing the CPPR, while other hardware does not
 338          * it is safe either way
 339          */
 340         pSeriesLP_cppr_info(0, 0);
 341         rtas_stop_self();
 342         /* Should never get here... */
 343         BUG();
 344         for(;;);
 345 }
 346
 347
 348 /*
 349  * Early initialization.  Relocation is on but do not reference unbolted pages
 350  */
 351 static void __init pSeries_init_early(void)
 352 {
 353         void *comport;
 354         int iommu_off = 0;
 355         unsigned int default_speed;
 356         u64 physport;
 357
 358         DBG(" -> pSeries_init_early()\n");
 359
 360         fw_feature_init();
 361
 362         if (systemcfg->platform & PLATFORM_LPAR)
 363                 hpte_init_lpar();
 364         else {
 365                 hpte_init_native();
 366                 iommu_off = (of_chosen &&
 367                              get_property(of_chosen, "linux,iommu-off", NULL));
 368         }
 369
 370         generic_find_legacy_serial_ports(&physport, &default_speed);
 371
 372         if (systemcfg->platform & PLATFORM_LPAR)
 373                 find_udbg_vterm();
 374         else if (physport) {
 375                 /* Map the uart for udbg. */
 376                 comport = (void *)ioremap(physport, 16);
 377                 udbg_init_uart(comport, default_speed);
 378
 379                 ppc_md.udbg_putc = udbg_putc;
 380                 ppc_md.udbg_getc = udbg_getc;
 381                 ppc_md.udbg_getc_poll = udbg_getc_poll;
 382                 DBG("Hello World !\n");
 383         }
 384
 385
 386         iommu_init_early_pSeries();
 387
 388         pSeries_discover_pic();
 389
 390         DBG(" <- pSeries_init_early()\n");
 391 }
 392
 393
 394 static int pSeries_check_legacy_ioport(unsigned int baseport)
 395 {
 396         struct device_node *np;
 397
 398 #define I8042_DATA_REG  0x60
 399 #define FDC_BASE        0x3f0
 400
 401
 402         switch(baseport) {
 403         case I8042_DATA_REG:
 404                 np = of_find_node_by_type(NULL, "8042");
 405                 if (np == NULL)
 406                         return -ENODEV;
 407                 of_node_put(np);
 408                 break;
 409         case FDC_BASE:
 410                 np = of_find_node_by_type(NULL, "fdc");
 411                 if (np == NULL)
 412                         return -ENODEV;
 413                 of_node_put(np);
 414                 break;
 415         }
 416         return 0;
 417 }
 418
 419 /*
 420  * Called very early, MMU is off, device-tree isn't unflattened
 421  */
 422 extern struct machdep_calls pSeries_md;
 423
 424 static int __init pSeries_probe(int platform)
 425 {
 426         if (platform != PLATFORM_PSERIES &&
 427             platform != PLATFORM_PSERIES_LPAR)
 428                 return 0;
 429
 430         /* if we have some ppc_md fixups for LPAR to do, do
 431          * it here ...
 432          */
 433
 434         return 1;
 435 }
 436
 437 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 438
 439 static inline void dedicated_idle_sleep(unsigned int cpu)
 440 {
 441         struct paca_struct *ppaca = &paca[cpu ^ 1];
 442
 443         /* Only sleep if the other thread is not idle */
 444         if (!(ppaca->lppaca.idle)) {
 445                 local_irq_disable();
 446
 447                 /*
 448                  * We are about to sleep the thread and so wont be polling any
 449                  * more.
 450                  */
 451                 clear_thread_flag(TIF_POLLING_NRFLAG);
 452
 453                 /*
 454                  * SMT dynamic mode. Cede will result in this thread going
 455                  * dormant, if the partner thread is still doing work.  Thread
 456                  * wakes up if partner goes idle, an interrupt is presented, or
 457                  * a prod occurs.  Returning from the cede enables external
 458                  * interrupts.
 459                  */
 460                 if (!need_resched())
 461                         cede_processor();
 462                 else
 463                         local_irq_enable();
 464         } else {
 465                 /*
 466                  * Give the HV an opportunity at the processor, since we are
 467                  * not doing any work.
 468                  */
 469                 poll_pending();
 470         }
 471 }
 472
 473 static int pseries_dedicated_idle(void)
 474 {
 475         long oldval;
 476         struct paca_struct *lpaca = get_paca();
 477         unsigned int cpu = smp_processor_id();
 478         unsigned long start_snooze;
 479         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 480
 481         while (1) {
 482                 /*
 483                  * Indicate to the HV that we are idle. Now would be
 484                  * a good time to find other work to dispatch.
 485                  */
 486                 lpaca->lppaca.idle = 1;
 487
 488                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 489                 if (!oldval) {
 490                         set_thread_flag(TIF_POLLING_NRFLAG);
 491
 492                         start_snooze = __get_tb() +
 493                                 *smt_snooze_delay * tb_ticks_per_usec;
 494
 495                         while (!need_resched() && !cpu_is_offline(cpu)) {
 496                                 ppc64_runlatch_off();
 497
 498                                 /*
 499                                  * Go into low thread priority and possibly
 500                                  * low power mode.
 501                                  */
 502                                 HMT_low();
 503                                 HMT_very_low();
 504
 505                                 if (*smt_snooze_delay != 0 &&
 506                                     __get_tb() > start_snooze) {
 507                                         HMT_medium();
 508                                         dedicated_idle_sleep(cpu);
 509                                 }
 510
 511                         }
 512
 513                         HMT_medium();
 514                         clear_thread_flag(TIF_POLLING_NRFLAG);
 515                 } else {
 516                         set_need_resched();
 517                 }
 518
 519                 lpaca->lppaca.idle = 0;
 520                 ppc64_runlatch_on();
 521
 522                 schedule();
 523
 524                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 525                         cpu_die();
 526         }
 527 }
 528
 529 static int pseries_shared_idle(void)
 530 {
 531         struct paca_struct *lpaca = get_paca();
 532         unsigned int cpu = smp_processor_id();
 533
 534         while (1) {
 535                 /*
 536                  * Indicate to the HV that we are idle. Now would be
 537                  * a good time to find other work to dispatch.
 538                  */
 539                 lpaca->lppaca.idle = 1;
 540
 541                 while (!need_resched() && !cpu_is_offline(cpu)) {
 542                         local_irq_disable();
 543                         ppc64_runlatch_off();
 544
 545                         /*
 546                          * Yield the processor to the hypervisor.  We return if
 547                          * an external interrupt occurs (which are driven prior
 548                          * to returning here) or if a prod occurs from another
 549                          * processor. When returning here, external interrupts
 550                          * are enabled.
 551                          *
 552                          * Check need_resched() again with interrupts disabled
 553                          * to avoid a race.
 554                          */
 555                         if (!need_resched())
 556                                 cede_processor();
 557                         else
 558                                 local_irq_enable();
 559
 560                         HMT_medium();
 561                 }
 562
 563                 lpaca->lppaca.idle = 0;
 564                 ppc64_runlatch_on();
 565
 566                 schedule();
 567
 568                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 569                         cpu_die();
 570         }
 571
 572         return 0;
 573 }
 574
 575 struct machdep_calls __initdata pSeries_md = {
 576         .probe                  = pSeries_probe,
 577         .setup_arch             = pSeries_setup_arch,
 578         .init_early             = pSeries_init_early,
 579         .get_cpuinfo            = pSeries_get_cpuinfo,
 580         .log_error              = pSeries_log_error,
 581         .pcibios_fixup          = pSeries_final_fixup,
 582         .irq_bus_setup          = pSeries_irq_bus_setup,
 583         .restart                = rtas_restart,
 584         .power_off              = rtas_power_off,
 585         .halt                   = rtas_halt,
 586         .panic                  = rtas_os_term,
 587         .cpu_die                = pSeries_mach_cpu_die,
 588         .get_boot_time          = rtas_get_boot_time,
 589         .get_rtc_time           = rtas_get_rtc_time,
 590         .set_rtc_time           = rtas_set_rtc_time,
 591         .calibrate_decr         = generic_calibrate_decr,
 592         .progress               = rtas_progress,
 593         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 594         .system_reset_exception = pSeries_system_reset_exception,
 595         .machine_check_exception = pSeries_machine_check_exception,
 596 };