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
  69 #include "plpar_wrappers.h"
  70 #include "pseries.h"
  71
  72 #ifdef DEBUG
  73 #define DBG(fmt...) udbg_printf(fmt)
  74 #else
  75 #define DBG(fmt...)
  76 #endif
  77
  78 /* move those away to a .h */
  79 extern void find_udbg_vterm(void);
  80
  81 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  82
  83 static void pseries_shared_idle_sleep(void);
  84 static void pseries_dedicated_idle_sleep(void);
  85
  86 static struct device_node *pSeries_mpic_node;
  87
  88 static void pSeries_show_cpuinfo(struct seq_file *m)
  89 {
  90         struct device_node *root;
  91         const char *model = "";
  92
  93         root = of_find_node_by_path("/");
  94         if (root)
  95                 model = get_property(root, "model", NULL);
  96         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  97         of_node_put(root);
  98 }
  99
 100 /* Initialize firmware assisted non-maskable interrupts if
 101  * the firmware supports this feature.
 102  */
 103 static void __init fwnmi_init(void)
 104 {
 105         unsigned long system_reset_addr, machine_check_addr;
 106
 107         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 108         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 109                 return;
 110
 111         /* If the kernel's not linked at zero we point the firmware at low
 112          * addresses anyway, and use a trampoline to get to the real code. */
 113         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 114         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 115
 116         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 117                                 machine_check_addr))
 118                 fwnmi_active = 1;
 119 }
 120
 121 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 122 {
 123         unsigned int cascade_irq = i8259_irq();
 124         if (cascade_irq != NO_IRQ)
 125                 generic_handle_irq(cascade_irq);
 126         desc->chip->eoi(irq);
 127 }
 128
 129 static void __init pseries_mpic_init_IRQ(void)
 130 {
 131         struct device_node *np, *old, *cascade = NULL;
 132         const unsigned int *addrp;
 133         unsigned long intack = 0;
 134         const unsigned int *opprop;
 135         unsigned long openpic_addr = 0;
 136         unsigned int cascade_irq;
 137         int naddr, n, i, opplen;
 138         struct mpic *mpic;
 139
 140         np = of_find_node_by_path("/");
 141         naddr = prom_n_addr_cells(np);
 142         opprop = get_property(np, "platform-open-pic", &opplen);
 143         if (opprop != 0) {
 144                 openpic_addr = of_read_number(opprop, naddr);
 145                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 146         }
 147         of_node_put(np);
 148
 149         BUG_ON(openpic_addr == 0);
 150
 151         /* Setup the openpic driver */
 152         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 153                           MPIC_PRIMARY,
 154                           16, 250, /* isu size, irq count */
 155                           " MPIC     ");
 156         BUG_ON(mpic == NULL);
 157
 158         /* Add ISUs */
 159         opplen /= sizeof(u32);
 160         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 161                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 162                 mpic_assign_isu(mpic, n, isuaddr);
 163         }
 164
 165         /* All ISUs are setup, complete initialization */
 166         mpic_init(mpic);
 167
 168         /* Look for cascade */
 169         for_each_node_by_type(np, "interrupt-controller")
 170                 if (device_is_compatible(np, "chrp,iic")) {
 171                         cascade = np;
 172                         break;
 173                 }
 174         if (cascade == NULL)
 175                 return;
 176
 177         cascade_irq = irq_of_parse_and_map(cascade, 0);
 178         if (cascade == NO_IRQ) {
 179                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
 180                 return;
 181         }
 182
 183         /* Check ACK type */
 184         for (old = of_node_get(cascade); old != NULL ; old = np) {
 185                 np = of_get_parent(old);
 186                 of_node_put(old);
 187                 if (np == NULL)
 188                         break;
 189                 if (strcmp(np->name, "pci") != 0)
 190                         continue;
 191                 addrp = get_property(np, "8259-interrupt-acknowledge",
 192                                             NULL);
 193                 if (addrp == NULL)
 194                         continue;
 195                 naddr = prom_n_addr_cells(np);
 196                 intack = addrp[naddr-1];
 197                 if (naddr > 1)
 198                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 199         }
 200         if (intack)
 201                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 202                        intack);
 203         i8259_init(cascade, intack);
 204         of_node_put(cascade);
 205         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 206 }
 207
 208 static void pseries_lpar_enable_pmcs(void)
 209 {
 210         unsigned long set, reset;
 211
 212         set = 1UL << 63;
 213         reset = 0;
 214         plpar_hcall_norets(H_PERFMON, set, reset);
 215
 216         /* instruct hypervisor to maintain PMCs */
 217         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 218                 get_lppaca()->pmcregs_in_use = 1;
 219 }
 220
 221 static void __init pseries_discover_pic(void)
 222 {
 223         struct device_node *np;
 224         const char *typep;
 225
 226         for (np = NULL; (np = of_find_node_by_name(np,
 227                                                    "interrupt-controller"));) {
 228                 typep = get_property(np, "compatible", NULL);
 229                 if (strstr(typep, "open-pic")) {
 230                         pSeries_mpic_node = of_node_get(np);
 231                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 232                         ppc_md.get_irq        = mpic_get_irq;
 233                         setup_kexec_cpu_down_mpic();
 234                         smp_init_pseries_mpic();
 235                         return;
 236                 } else if (strstr(typep, "ppc-xicp")) {
 237                         ppc_md.init_IRQ       = xics_init_IRQ;
 238                         setup_kexec_cpu_down_xics();
 239                         smp_init_pseries_xics();
 240                         return;
 241                 }
 242         }
 243         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 244                " interrupt-controller\n");
 245 }
 246
 247 static void __init pSeries_setup_arch(void)
 248 {
 249         /* Discover PIC type and setup ppc_md accordingly */
 250         pseries_discover_pic();
 251
 252         /* openpic global configuration register (64-bit format). */
 253         /* openpic Interrupt Source Unit pointer (64-bit format). */
 254         /* python0 facility area (mmio) (64-bit format) REAL address. */
 255
 256         /* init to some ~sane value until calibrate_delay() runs */
 257         loops_per_jiffy = 50000000;
 258
 259         if (ROOT_DEV == 0) {
 260                 printk("No ramdisk, default root is /dev/sda2\n");
 261                 ROOT_DEV = Root_SDA2;
 262         }
 263
 264         fwnmi_init();
 265
 266         /* Find and initialize PCI host bridges */
 267         init_pci_config_tokens();
 268         find_and_init_phbs();
 269         eeh_init();
 270
 271         pSeries_nvram_init();
 272
 273         /* Choose an idle loop */
 274         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 275                 vpa_init(boot_cpuid);
 276                 if (get_lppaca()->shared_proc) {
 277                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 278                         ppc_md.power_save = pseries_shared_idle_sleep;
 279                 } else {
 280                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 281                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 282                 }
 283         } else {
 284                 printk(KERN_DEBUG "Using default idle loop\n");
 285         }
 286
 287         if (firmware_has_feature(FW_FEATURE_LPAR))
 288                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 289         else
 290                 ppc_md.enable_pmcs = power4_enable_pmcs;
 291 }
 292
 293 static int __init pSeries_init_panel(void)
 294 {
 295         /* Manually leave the kernel version on the panel. */
 296         ppc_md.progress("Linux ppc64\n", 0);
 297         ppc_md.progress(init_utsname()->version, 0);
 298
 299         return 0;
 300 }
 301 arch_initcall(pSeries_init_panel);
 302
 303 static int pseries_set_dabr(unsigned long dabr)
 304 {
 305         return plpar_hcall_norets(H_SET_DABR, dabr);
 306 }
 307
 308 static int pseries_set_xdabr(unsigned long dabr)
 309 {
 310         /* We want to catch accesses from kernel and userspace */
 311         return plpar_hcall_norets(H_SET_XDABR, dabr,
 312                         H_DABRX_KERNEL | H_DABRX_USER);
 313 }
 314
 315 /*
 316  * Early initialization.  Relocation is on but do not reference unbolted pages
 317  */
 318 static void __init pSeries_init_early(void)
 319 {
 320         DBG(" -> pSeries_init_early()\n");
 321
 322         fw_feature_init();
 323
 324         if (firmware_has_feature(FW_FEATURE_LPAR))
 325                 find_udbg_vterm();
 326
 327         if (firmware_has_feature(FW_FEATURE_DABR))
 328                 ppc_md.set_dabr = pseries_set_dabr;
 329         else if (firmware_has_feature(FW_FEATURE_XDABR))
 330                 ppc_md.set_dabr = pseries_set_xdabr;
 331
 332         iommu_init_early_pSeries();
 333
 334         DBG(" <- pSeries_init_early()\n");
 335 }
 336
 337
 338 static int pSeries_check_legacy_ioport(unsigned int baseport)
 339 {
 340         struct device_node *np;
 341
 342 #define I8042_DATA_REG  0x60
 343 #define FDC_BASE        0x3f0
 344
 345
 346         switch(baseport) {
 347         case I8042_DATA_REG:
 348                 np = of_find_node_by_type(NULL, "8042");
 349                 if (np == NULL)
 350                         return -ENODEV;
 351                 of_node_put(np);
 352                 break;
 353         case FDC_BASE:
 354                 np = of_find_node_by_type(NULL, "fdc");
 355                 if (np == NULL)
 356                         return -ENODEV;
 357                 of_node_put(np);
 358                 break;
 359         }
 360         return 0;
 361 }
 362
 363 /*
 364  * Called very early, MMU is off, device-tree isn't unflattened
 365  */
 366
 367 static int __init pSeries_probe_hypertas(unsigned long node,
 368                                          const char *uname, int depth,
 369                                          void *data)
 370 {
 371         if (depth != 1 ||
 372             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 373                 return 0;
 374
 375         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 376                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 377
 378         return 1;
 379 }
 380
 381 static int __init pSeries_probe(void)
 382 {
 383         unsigned long root = of_get_flat_dt_root();
 384         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 385
 386         if (dtype == NULL)
 387                 return 0;
 388         if (strcmp(dtype, "chrp"))
 389                 return 0;
 390
 391         /* Cell blades firmware claims to be chrp while it's not. Until this
 392          * is fixed, we need to avoid those here.
 393          */
 394         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 395             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 396                 return 0;
 397
 398         DBG("pSeries detected, looking for LPAR capability...\n");
 399
 400         /* Now try to figure out if we are running on LPAR */
 401         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 402
 403         if (firmware_has_feature(FW_FEATURE_LPAR))
 404                 hpte_init_lpar();
 405         else
 406                 hpte_init_native();
 407
 408         DBG("Machine is%s LPAR !\n",
 409             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 410
 411         return 1;
 412 }
 413
 414
 415 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 416
 417 static void pseries_dedicated_idle_sleep(void)
 418 {
 419         unsigned int cpu = smp_processor_id();
 420         unsigned long start_snooze;
 421
 422         /*
 423          * Indicate to the HV that we are idle. Now would be
 424          * a good time to find other work to dispatch.
 425          */
 426         get_lppaca()->idle = 1;
 427
 428         /*
 429          * We come in with interrupts disabled, and need_resched()
 430          * has been checked recently.  If we should poll for a little
 431          * while, do so.
 432          */
 433         if (__get_cpu_var(smt_snooze_delay)) {
 434                 start_snooze = get_tb() +
 435                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 436                 local_irq_enable();
 437                 set_thread_flag(TIF_POLLING_NRFLAG);
 438
 439                 while (get_tb() < start_snooze) {
 440                         if (need_resched() || cpu_is_offline(cpu))
 441                                 goto out;
 442                         ppc64_runlatch_off();
 443                         HMT_low();
 444                         HMT_very_low();
 445                 }
 446
 447                 HMT_medium();
 448                 clear_thread_flag(TIF_POLLING_NRFLAG);
 449                 smp_mb();
 450                 local_irq_disable();
 451                 if (need_resched() || cpu_is_offline(cpu))
 452                         goto out;
 453         }
 454
 455         cede_processor();
 456
 457 out:
 458         HMT_medium();
 459         get_lppaca()->idle = 0;
 460 }
 461
 462 static void pseries_shared_idle_sleep(void)
 463 {
 464         /*
 465          * Indicate to the HV that we are idle. Now would be
 466          * a good time to find other work to dispatch.
 467          */
 468         get_lppaca()->idle = 1;
 469
 470         /*
 471          * Yield the processor to the hypervisor.  We return if
 472          * an external interrupt occurs (which are driven prior
 473          * to returning here) or if a prod occurs from another
 474          * processor. When returning here, external interrupts
 475          * are enabled.
 476          */
 477         cede_processor();
 478
 479         get_lppaca()->idle = 0;
 480 }
 481
 482 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 483 {
 484         if (firmware_has_feature(FW_FEATURE_LPAR))
 485                 return PCI_PROBE_DEVTREE;
 486         return PCI_PROBE_NORMAL;
 487 }
 488
 489 /**
 490  * pSeries_power_off - tell firmware about how to power off the system.
 491  *
 492  * This function calls either the power-off rtas token in normal cases
 493  * or the ibm,power-off-ups token (if present & requested) in case of
 494  * a power failure. If power-off token is used, power on will only be
 495  * possible with power button press. If ibm,power-off-ups token is used
 496  * it will allow auto poweron after power is restored.
 497  */
 498 void pSeries_power_off(void)
 499 {
 500         int rc;
 501         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 502
 503         if (rtas_flash_term_hook)
 504                 rtas_flash_term_hook(SYS_POWER_OFF);
 505
 506         if (rtas_poweron_auto == 0 ||
 507                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 508                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 509                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 510         } else {
 511                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 512                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 513         }
 514         for (;;);
 515 }
 516
 517 define_machine(pseries) {
 518         .name                   = "pSeries",
 519         .probe                  = pSeries_probe,
 520         .setup_arch             = pSeries_setup_arch,
 521         .init_early             = pSeries_init_early,
 522         .show_cpuinfo           = pSeries_show_cpuinfo,
 523         .log_error              = pSeries_log_error,
 524         .pcibios_fixup          = pSeries_final_fixup,
 525         .pci_probe_mode         = pSeries_pci_probe_mode,
 526         .restart                = rtas_restart,
 527         .power_off              = pSeries_power_off,
 528         .halt                   = rtas_halt,
 529         .panic                  = rtas_os_term,
 530         .get_boot_time          = rtas_get_boot_time,
 531         .get_rtc_time           = rtas_get_rtc_time,
 532         .set_rtc_time           = rtas_set_rtc_time,
 533         .calibrate_decr         = generic_calibrate_decr,
 534         .progress               = rtas_progress,
 535         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 536         .system_reset_exception = pSeries_system_reset_exception,
 537         .machine_check_exception = pSeries_machine_check_exception,
 538 };