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/cpu.h>
  22 #include <linux/errno.h>
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/stddef.h>
  27 #include <linux/unistd.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/a.out.h>
  31 #include <linux/tty.h>
  32 #include <linux/major.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/reboot.h>
  35 #include <linux/init.h>
  36 #include <linux/ioport.h>
  37 #include <linux/console.h>
  38 #include <linux/pci.h>
  39 #include <linux/utsname.h>
  40 #include <linux/adb.h>
  41 #include <linux/module.h>
  42 #include <linux/delay.h>
  43 #include <linux/irq.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/root_dev.h>
  46
  47 #include <asm/mmu.h>
  48 #include <asm/processor.h>
  49 #include <asm/io.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/prom.h>
  52 #include <asm/rtas.h>
  53 #include <asm/pci-bridge.h>
  54 #include <asm/iommu.h>
  55 #include <asm/dma.h>
  56 #include <asm/machdep.h>
  57 #include <asm/irq.h>
  58 #include <asm/time.h>
  59 #include <asm/nvram.h>
  60 #include "xics.h"
  61 #include <asm/pmc.h>
  62 #include <asm/mpic.h>
  63 #include <asm/ppc-pci.h>
  64 #include <asm/i8259.h>
  65 #include <asm/udbg.h>
  66 #include <asm/smp.h>
  67 #include <asm/firmware.h>
  68 #include <asm/eeh.h>
  69
  70 #include "plpar_wrappers.h"
  71 #include "pseries.h"
  72
  73 #ifdef DEBUG
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  80
  81 static void pseries_shared_idle_sleep(void);
  82 static void pseries_dedicated_idle_sleep(void);
  83
  84 static struct device_node *pSeries_mpic_node;
  85
  86 static void pSeries_show_cpuinfo(struct seq_file *m)
  87 {
  88         struct device_node *root;
  89         const char *model = "";
  90
  91         root = of_find_node_by_path("/");
  92         if (root)
  93                 model = of_get_property(root, "model", NULL);
  94         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  95         of_node_put(root);
  96 }
  97
  98 /* Initialize firmware assisted non-maskable interrupts if
  99  * the firmware supports this feature.
 100  */
 101 static void __init fwnmi_init(void)
 102 {
 103         unsigned long system_reset_addr, machine_check_addr;
 104
 105         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 106         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 107                 return;
 108
 109         /* If the kernel's not linked at zero we point the firmware at low
 110          * addresses anyway, and use a trampoline to get to the real code. */
 111         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 112         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 113
 114         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 115                                 machine_check_addr))
 116                 fwnmi_active = 1;
 117 }
 118
 119 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 120 {
 121         unsigned int cascade_irq = i8259_irq();
 122         if (cascade_irq != NO_IRQ)
 123                 generic_handle_irq(cascade_irq);
 124         desc->chip->eoi(irq);
 125 }
 126
 127 static void __init pseries_setup_i8259_cascade(void)
 128 {
 129         struct device_node *np, *old, *found = NULL;
 130         unsigned int cascade;
 131         const u32 *addrp;
 132         unsigned long intack = 0;
 133         int naddr;
 134
 135         for_each_node_by_type(np, "interrupt-controller") {
 136                 if (of_device_is_compatible(np, "chrp,iic")) {
 137                         found = np;
 138                         break;
 139                 }
 140         }
 141
 142         if (found == NULL) {
 143                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 144                 return;
 145         }
 146
 147         cascade = irq_of_parse_and_map(found, 0);
 148         if (cascade == NO_IRQ) {
 149                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 150                 return;
 151         }
 152         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 153
 154         for (old = of_node_get(found); old != NULL ; old = np) {
 155                 np = of_get_parent(old);
 156                 of_node_put(old);
 157                 if (np == NULL)
 158                         break;
 159                 if (strcmp(np->name, "pci") != 0)
 160                         continue;
 161                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 162                 if (addrp == NULL)
 163                         continue;
 164                 naddr = of_n_addr_cells(np);
 165                 intack = addrp[naddr-1];
 166                 if (naddr > 1)
 167                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 168         }
 169         if (intack)
 170                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 171         i8259_init(found, intack);
 172         of_node_put(found);
 173         set_irq_chained_handler(cascade, pseries_8259_cascade);
 174 }
 175
 176 static void __init pseries_mpic_init_IRQ(void)
 177 {
 178         struct device_node *np;
 179         const unsigned int *opprop;
 180         unsigned long openpic_addr = 0;
 181         int naddr, n, i, opplen;
 182         struct mpic *mpic;
 183
 184         np = of_find_node_by_path("/");
 185         naddr = of_n_addr_cells(np);
 186         opprop = of_get_property(np, "platform-open-pic", &opplen);
 187         if (opprop != 0) {
 188                 openpic_addr = of_read_number(opprop, naddr);
 189                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 190         }
 191         of_node_put(np);
 192
 193         BUG_ON(openpic_addr == 0);
 194
 195         /* Setup the openpic driver */
 196         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 197                           MPIC_PRIMARY,
 198                           16, 250, /* isu size, irq count */
 199                           " MPIC     ");
 200         BUG_ON(mpic == NULL);
 201
 202         /* Add ISUs */
 203         opplen /= sizeof(u32);
 204         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 205                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 206                 mpic_assign_isu(mpic, n, isuaddr);
 207         }
 208
 209         /* All ISUs are setup, complete initialization */
 210         mpic_init(mpic);
 211
 212         /* Look for cascade */
 213         pseries_setup_i8259_cascade();
 214 }
 215
 216 static void __init pseries_xics_init_IRQ(void)
 217 {
 218         xics_init_IRQ();
 219         pseries_setup_i8259_cascade();
 220 }
 221
 222 static void pseries_lpar_enable_pmcs(void)
 223 {
 224         unsigned long set, reset;
 225
 226         set = 1UL << 63;
 227         reset = 0;
 228         plpar_hcall_norets(H_PERFMON, set, reset);
 229
 230         /* instruct hypervisor to maintain PMCs */
 231         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 232                 get_lppaca()->pmcregs_in_use = 1;
 233 }
 234
 235 static void __init pseries_discover_pic(void)
 236 {
 237         struct device_node *np;
 238         const char *typep;
 239
 240         for (np = NULL; (np = of_find_node_by_name(np,
 241                                                    "interrupt-controller"));) {
 242                 typep = of_get_property(np, "compatible", NULL);
 243                 if (strstr(typep, "open-pic")) {
 244                         pSeries_mpic_node = of_node_get(np);
 245                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 246                         ppc_md.get_irq        = mpic_get_irq;
 247                         setup_kexec_cpu_down_mpic();
 248                         smp_init_pseries_mpic();
 249                         return;
 250                 } else if (strstr(typep, "ppc-xicp")) {
 251                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 252                         setup_kexec_cpu_down_xics();
 253                         smp_init_pseries_xics();
 254                         return;
 255                 }
 256         }
 257         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 258                " interrupt-controller\n");
 259 }
 260
 261 static void __init pSeries_setup_arch(void)
 262 {
 263         /* Discover PIC type and setup ppc_md accordingly */
 264         pseries_discover_pic();
 265
 266         /* openpic global configuration register (64-bit format). */
 267         /* openpic Interrupt Source Unit pointer (64-bit format). */
 268         /* python0 facility area (mmio) (64-bit format) REAL address. */
 269
 270         /* init to some ~sane value until calibrate_delay() runs */
 271         loops_per_jiffy = 50000000;
 272
 273         fwnmi_init();
 274
 275         /* Find and initialize PCI host bridges */
 276         init_pci_config_tokens();
 277         find_and_init_phbs();
 278         eeh_init();
 279
 280         pSeries_nvram_init();
 281
 282         /* Choose an idle loop */
 283         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 284                 vpa_init(boot_cpuid);
 285                 if (get_lppaca()->shared_proc) {
 286                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 287                         ppc_md.power_save = pseries_shared_idle_sleep;
 288                 } else {
 289                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 290                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 291                 }
 292         } else {
 293                 printk(KERN_DEBUG "Using default idle loop\n");
 294         }
 295
 296         if (firmware_has_feature(FW_FEATURE_LPAR))
 297                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 298         else
 299                 ppc_md.enable_pmcs = power4_enable_pmcs;
 300 }
 301
 302 static int __init pSeries_init_panel(void)
 303 {
 304         /* Manually leave the kernel version on the panel. */
 305         ppc_md.progress("Linux ppc64\n", 0);
 306         ppc_md.progress(init_utsname()->version, 0);
 307
 308         return 0;
 309 }
 310 arch_initcall(pSeries_init_panel);
 311
 312 static int pseries_set_dabr(unsigned long dabr)
 313 {
 314         return plpar_hcall_norets(H_SET_DABR, dabr);
 315 }
 316
 317 static int pseries_set_xdabr(unsigned long dabr)
 318 {
 319         /* We want to catch accesses from kernel and userspace */
 320         return plpar_hcall_norets(H_SET_XDABR, dabr,
 321                         H_DABRX_KERNEL | H_DABRX_USER);
 322 }
 323
 324 /*
 325  * Early initialization.  Relocation is on but do not reference unbolted pages
 326  */
 327 static void __init pSeries_init_early(void)
 328 {
 329         DBG(" -> pSeries_init_early()\n");
 330
 331         if (firmware_has_feature(FW_FEATURE_LPAR))
 332                 find_udbg_vterm();
 333
 334         if (firmware_has_feature(FW_FEATURE_DABR))
 335                 ppc_md.set_dabr = pseries_set_dabr;
 336         else if (firmware_has_feature(FW_FEATURE_XDABR))
 337                 ppc_md.set_dabr = pseries_set_xdabr;
 338
 339         iommu_init_early_pSeries();
 340
 341         DBG(" <- pSeries_init_early()\n");
 342 }
 343
 344 /*
 345  * Called very early, MMU is off, device-tree isn't unflattened
 346  */
 347
 348 static int __init pSeries_probe_hypertas(unsigned long node,
 349                                          const char *uname, int depth,
 350                                          void *data)
 351 {
 352         const char *hypertas;
 353         unsigned long len;
 354
 355         if (depth != 1 ||
 356             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 357                 return 0;
 358
 359         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 360         if (!hypertas)
 361                 return 1;
 362
 363         powerpc_firmware_features |= FW_FEATURE_LPAR;
 364         fw_feature_init(hypertas, len);
 365
 366         return 1;
 367 }
 368
 369 static int __init pSeries_probe(void)
 370 {
 371         unsigned long root = of_get_flat_dt_root();
 372         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 373
 374         if (dtype == NULL)
 375                 return 0;
 376         if (strcmp(dtype, "chrp"))
 377                 return 0;
 378
 379         /* Cell blades firmware claims to be chrp while it's not. Until this
 380          * is fixed, we need to avoid those here.
 381          */
 382         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 383             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 384                 return 0;
 385
 386         DBG("pSeries detected, looking for LPAR capability...\n");
 387
 388         /* Now try to figure out if we are running on LPAR */
 389         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 390
 391         if (firmware_has_feature(FW_FEATURE_LPAR))
 392                 hpte_init_lpar();
 393         else
 394                 hpte_init_native();
 395
 396         DBG("Machine is%s LPAR !\n",
 397             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 398
 399         return 1;
 400 }
 401
 402
 403 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 404
 405 static void pseries_dedicated_idle_sleep(void)
 406 {
 407         unsigned int cpu = smp_processor_id();
 408         unsigned long start_snooze;
 409         unsigned long in_purr, out_purr;
 410
 411         /*
 412          * Indicate to the HV that we are idle. Now would be
 413          * a good time to find other work to dispatch.
 414          */
 415         get_lppaca()->idle = 1;
 416         get_lppaca()->donate_dedicated_cpu = 1;
 417         in_purr = mfspr(SPRN_PURR);
 418
 419         /*
 420          * We come in with interrupts disabled, and need_resched()
 421          * has been checked recently.  If we should poll for a little
 422          * while, do so.
 423          */
 424         if (__get_cpu_var(smt_snooze_delay)) {
 425                 start_snooze = get_tb() +
 426                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 427                 local_irq_enable();
 428                 set_thread_flag(TIF_POLLING_NRFLAG);
 429
 430                 while (get_tb() < start_snooze) {
 431                         if (need_resched() || cpu_is_offline(cpu))
 432                                 goto out;
 433                         ppc64_runlatch_off();
 434                         HMT_low();
 435                         HMT_very_low();
 436                 }
 437
 438                 HMT_medium();
 439                 clear_thread_flag(TIF_POLLING_NRFLAG);
 440                 smp_mb();
 441                 local_irq_disable();
 442                 if (need_resched() || cpu_is_offline(cpu))
 443                         goto out;
 444         }
 445
 446         cede_processor();
 447
 448 out:
 449         HMT_medium();
 450         out_purr = mfspr(SPRN_PURR);
 451         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 452         get_lppaca()->donate_dedicated_cpu = 0;
 453         get_lppaca()->idle = 0;
 454 }
 455
 456 static void pseries_shared_idle_sleep(void)
 457 {
 458         /*
 459          * Indicate to the HV that we are idle. Now would be
 460          * a good time to find other work to dispatch.
 461          */
 462         get_lppaca()->idle = 1;
 463
 464         /*
 465          * Yield the processor to the hypervisor.  We return if
 466          * an external interrupt occurs (which are driven prior
 467          * to returning here) or if a prod occurs from another
 468          * processor. When returning here, external interrupts
 469          * are enabled.
 470          */
 471         cede_processor();
 472
 473         get_lppaca()->idle = 0;
 474 }
 475
 476 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 477 {
 478         if (firmware_has_feature(FW_FEATURE_LPAR))
 479                 return PCI_PROBE_DEVTREE;
 480         return PCI_PROBE_NORMAL;
 481 }
 482
 483 /**
 484  * pSeries_power_off - tell firmware about how to power off the system.
 485  *
 486  * This function calls either the power-off rtas token in normal cases
 487  * or the ibm,power-off-ups token (if present & requested) in case of
 488  * a power failure. If power-off token is used, power on will only be
 489  * possible with power button press. If ibm,power-off-ups token is used
 490  * it will allow auto poweron after power is restored.
 491  */
 492 void pSeries_power_off(void)
 493 {
 494         int rc;
 495         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 496
 497         if (rtas_flash_term_hook)
 498                 rtas_flash_term_hook(SYS_POWER_OFF);
 499
 500         if (rtas_poweron_auto == 0 ||
 501                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 502                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 503                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 504         } else {
 505                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 506                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 507         }
 508         for (;;);
 509 }
 510
 511 #ifndef CONFIG_PCI
 512 void pSeries_final_fixup(void) { }
 513 #endif
 514
 515 define_machine(pseries) {
 516         .name                   = "pSeries",
 517         .probe                  = pSeries_probe,
 518         .setup_arch             = pSeries_setup_arch,
 519         .init_early             = pSeries_init_early,
 520         .show_cpuinfo           = pSeries_show_cpuinfo,
 521         .log_error              = pSeries_log_error,
 522         .pcibios_fixup          = pSeries_final_fixup,
 523         .pci_probe_mode         = pSeries_pci_probe_mode,
 524         .restart                = rtas_restart,
 525         .power_off              = pSeries_power_off,
 526         .halt                   = rtas_halt,
 527         .panic                  = rtas_os_term,
 528         .get_boot_time          = rtas_get_boot_time,
 529         .get_rtc_time           = rtas_get_rtc_time,
 530         .set_rtc_time           = rtas_set_rtc_time,
 531         .calibrate_decr         = generic_calibrate_decr,
 532         .progress               = rtas_progress,
 533         .system_reset_exception = pSeries_system_reset_exception,
 534         .machine_check_exception = pSeries_machine_check_exception,
 535 };