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setup.c

/*
 *  64-bit pSeries and RS/6000 setup code.
 *
 *  Copyright (C) 1995  Linus Torvalds
 *  Adapted from 'alpha' version by Gary Thomas
 *  Modified by Cort Dougan (cort@cs.nmt.edu)
 *  Modified by PPC64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

/*
 * bootup setup stuff..
 */

#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/major.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/utsname.h>
#include <linux/adb.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>

#include <asm/mmu.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/time.h>
#include <asm/nvram.h>
#include "xics.h"
#include <asm/pmc.h>
#include <asm/mpic.h>
#include <asm/ppc-pci.h>
#include <asm/i8259.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include <asm/firmware.h>
#include <asm/eeh.h>

#include "plpar_wrappers.h"
#include "pseries.h"

int CMO_PrPSP = -1;
int CMO_SecPSP = -1;
unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);

int fwnmi_active;  /* TRUE if an FWNMI handler is present */

static void pseries_shared_idle_sleep(void);
static void pseries_dedicated_idle_sleep(void);

static struct device_node *pSeries_mpic_node;

static void pSeries_show_cpuinfo(struct seq_file *m)
{
      struct device_node *root;
      const char *model = "";

      root = of_find_node_by_path("/");
      if (root)
            model = of_get_property(root, "model", NULL);
      seq_printf(m, "machine\t\t: CHRP %s\n", model);
      of_node_put(root);
}

/* Initialize firmware assisted non-maskable interrupts if
 * the firmware supports this feature.
 */
static void __init fwnmi_init(void)
{
      unsigned long system_reset_addr, machine_check_addr;

      int ibm_nmi_register = rtas_token("ibm,nmi-register");
      if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
            return;

      /* If the kernel's not linked at zero we point the firmware at low
       * addresses anyway, and use a trampoline to get to the real code. */
      system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
      machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;

      if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
                        machine_check_addr))
            fwnmi_active = 1;
}

static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
{
      unsigned int cascade_irq = i8259_irq();
      if (cascade_irq != NO_IRQ)
            generic_handle_irq(cascade_irq);
      desc->chip->eoi(irq);
}

static void __init pseries_setup_i8259_cascade(void)
{
      struct device_node *np, *old, *found = NULL;
      unsigned int cascade;
      const u32 *addrp;
      unsigned long intack = 0;
      int naddr;

      for_each_node_by_type(np, "interrupt-controller") {
            if (of_device_is_compatible(np, "chrp,iic")) {
                  found = np;
                  break;
            }
      }

      if (found == NULL) {
            printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
            return;
      }

      cascade = irq_of_parse_and_map(found, 0);
      if (cascade == NO_IRQ) {
            printk(KERN_ERR "pic: failed to map cascade interrupt");
            return;
      }
      pr_debug("pic: cascade mapped to irq %d\n", cascade);

      for (old = of_node_get(found); old != NULL ; old = np) {
            np = of_get_parent(old);
            of_node_put(old);
            if (np == NULL)
                  break;
            if (strcmp(np->name, "pci") != 0)
                  continue;
            addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
            if (addrp == NULL)
                  continue;
            naddr = of_n_addr_cells(np);
            intack = addrp[naddr-1];
            if (naddr > 1)
                  intack |= ((unsigned long)addrp[naddr-2]) << 32;
      }
      if (intack)
            printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
      i8259_init(found, intack);
      of_node_put(found);
      set_irq_chained_handler(cascade, pseries_8259_cascade);
}

static void __init pseries_mpic_init_IRQ(void)
{
      struct device_node *np;
      const unsigned int *opprop;
      unsigned long openpic_addr = 0;
      int naddr, n, i, opplen;
      struct mpic *mpic;

      np = of_find_node_by_path("/");
      naddr = of_n_addr_cells(np);
      opprop = of_get_property(np, "platform-open-pic", &opplen);
      if (opprop != 0) {
            openpic_addr = of_read_number(opprop, naddr);
            printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
      }
      of_node_put(np);

      BUG_ON(openpic_addr == 0);

      /* Setup the openpic driver */
      mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
                    MPIC_PRIMARY,
                    16, 250, /* isu size, irq count */
                    " MPIC     ");
      BUG_ON(mpic == NULL);

      /* Add ISUs */
      opplen /= sizeof(u32);
      for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
            unsigned long isuaddr = of_read_number(opprop + i, naddr);
            mpic_assign_isu(mpic, n, isuaddr);
      }

      /* All ISUs are setup, complete initialization */
      mpic_init(mpic);

      /* Look for cascade */
      pseries_setup_i8259_cascade();
}

static void __init pseries_xics_init_IRQ(void)
{
      xics_init_IRQ();
      pseries_setup_i8259_cascade();
}

static void pseries_lpar_enable_pmcs(void)
{
      unsigned long set, reset;

      set = 1UL << 63;
      reset = 0;
      plpar_hcall_norets(H_PERFMON, set, reset);

      /* instruct hypervisor to maintain PMCs */
      if (firmware_has_feature(FW_FEATURE_SPLPAR))
            get_lppaca()->pmcregs_in_use = 1;
}

static void __init pseries_discover_pic(void)
{
      struct device_node *np;
      const char *typep;

      for (np = NULL; (np = of_find_node_by_name(np,
                                       "interrupt-controller"));) {
            typep = of_get_property(np, "compatible", NULL);
            if (strstr(typep, "open-pic")) {
                  pSeries_mpic_node = of_node_get(np);
                  ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
                  ppc_md.get_irq        = mpic_get_irq;
                  setup_kexec_cpu_down_mpic();
                  smp_init_pseries_mpic();
                  return;
            } else if (strstr(typep, "ppc-xicp")) {
                  ppc_md.init_IRQ       = pseries_xics_init_IRQ;
                  setup_kexec_cpu_down_xics();
                  smp_init_pseries_xics();
                  return;
            }
      }
      printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
             " interrupt-controller\n");
}

static void __init pSeries_setup_arch(void)
{
      /* Discover PIC type and setup ppc_md accordingly */
      pseries_discover_pic();

      /* openpic global configuration register (64-bit format). */
      /* openpic Interrupt Source Unit pointer (64-bit format). */
      /* python0 facility area (mmio) (64-bit format) REAL address. */

      /* init to some ~sane value until calibrate_delay() runs */
      loops_per_jiffy = 50000000;

      fwnmi_init();

      /* Find and initialize PCI host bridges */
      init_pci_config_tokens();
      find_and_init_phbs();
      eeh_init();

      pSeries_nvram_init();

      /* Choose an idle loop */
      if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
            vpa_init(boot_cpuid);
            if (get_lppaca()->shared_proc) {
                  printk(KERN_DEBUG "Using shared processor idle loop\n");
                  ppc_md.power_save = pseries_shared_idle_sleep;
            } else {
                  printk(KERN_DEBUG "Using dedicated idle loop\n");
                  ppc_md.power_save = pseries_dedicated_idle_sleep;
            }
      } else {
            printk(KERN_DEBUG "Using default idle loop\n");
      }

      if (firmware_has_feature(FW_FEATURE_LPAR))
            ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
      else
            ppc_md.enable_pmcs = power4_enable_pmcs;
}

static int __init pSeries_init_panel(void)
{
      /* Manually leave the kernel version on the panel. */
      ppc_md.progress("Linux ppc64\n", 0);
      ppc_md.progress(init_utsname()->version, 0);

      return 0;
}
arch_initcall(pSeries_init_panel);

static int pseries_set_dabr(unsigned long dabr)
{
      return plpar_hcall_norets(H_SET_DABR, dabr);
}

static int pseries_set_xdabr(unsigned long dabr)
{
      /* We want to catch accesses from kernel and userspace */
      return plpar_hcall_norets(H_SET_XDABR, dabr,
                  H_DABRX_KERNEL | H_DABRX_USER);
}

#define CMO_CHARACTERISTICS_TOKEN 44
#define CMO_MAXLENGTH 1026

/**
 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 * handle that here. (Stolen from parse_system_parameter_string)
 */
void pSeries_cmo_feature_init(void)
{
      char *ptr, *key, *value, *end;
      int call_status;
      int page_order = IOMMU_PAGE_SHIFT;

      pr_debug(" -> fw_cmo_feature_init()\n");
      spin_lock(&rtas_data_buf_lock);
      memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
      call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
                        NULL,
                        CMO_CHARACTERISTICS_TOKEN,
                        __pa(rtas_data_buf),
                        RTAS_DATA_BUF_SIZE);

      if (call_status != 0) {
            spin_unlock(&rtas_data_buf_lock);
            pr_debug("CMO not available\n");
            pr_debug(" <- fw_cmo_feature_init()\n");
            return;
      }

      end = rtas_data_buf + CMO_MAXLENGTH - 2;
      ptr = rtas_data_buf + 2;      /* step over strlen value */
      key = value = ptr;

      while (*ptr && (ptr <= end)) {
            /* Separate the key and value by replacing '=' with '\0' and
             * point the value at the string after the '='
             */
            if (ptr[0] == '=') {
                  ptr[0] = '\0';
                  value = ptr + 1;
            } else if (ptr[0] == '\0' || ptr[0] == ',') {
                  /* Terminate the string containing the key/value pair */
                  ptr[0] = '\0';

                  if (key == value) {
                        pr_debug("Malformed key/value pair\n");
                        /* Never found a '=', end processing */
                        break;
                  }

                  if (0 == strcmp(key, "CMOPageSize"))
                        page_order = simple_strtol(value, NULL, 10);
                  else if (0 == strcmp(key, "PrPSP"))
                        CMO_PrPSP = simple_strtol(value, NULL, 10);
                  else if (0 == strcmp(key, "SecPSP"))
                        CMO_SecPSP = simple_strtol(value, NULL, 10);
                  value = key = ptr + 1;
            }
            ptr++;
      }

      /* Page size is returned as the power of 2 of the page size,
       * convert to the page size in bytes before returning
       */
      CMO_PageSize = 1 << page_order;
      pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);

      if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
            pr_info("CMO enabled\n");
            pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
                     CMO_SecPSP);
            powerpc_firmware_features |= FW_FEATURE_CMO;
      } else
            pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
                     CMO_SecPSP);
      spin_unlock(&rtas_data_buf_lock);
      pr_debug(" <- fw_cmo_feature_init()\n");
}

/*
 * Early initialization.  Relocation is on but do not reference unbolted pages
 */
static void __init pSeries_init_early(void)
{
      pr_debug(" -> pSeries_init_early()\n");

      if (firmware_has_feature(FW_FEATURE_LPAR))
            find_udbg_vterm();

      if (firmware_has_feature(FW_FEATURE_DABR))
            ppc_md.set_dabr = pseries_set_dabr;
      else if (firmware_has_feature(FW_FEATURE_XDABR))
            ppc_md.set_dabr = pseries_set_xdabr;

      pSeries_cmo_feature_init();
      iommu_init_early_pSeries();

      pr_debug(" <- pSeries_init_early()\n");
}

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */

static int __init pSeries_probe_hypertas(unsigned long node,
                               const char *uname, int depth,
                               void *data)
{
      const char *hypertas;
      unsigned long len;

      if (depth != 1 ||
          (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
            return 0;

      hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
      if (!hypertas)
            return 1;

      powerpc_firmware_features |= FW_FEATURE_LPAR;
      fw_feature_init(hypertas, len);

      return 1;
}

static int __init pSeries_probe(void)
{
      unsigned long root = of_get_flat_dt_root();
      char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);

      if (dtype == NULL)
            return 0;
      if (strcmp(dtype, "chrp"))
            return 0;

      /* Cell blades firmware claims to be chrp while it's not. Until this
       * is fixed, we need to avoid those here.
       */
      if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
          of_flat_dt_is_compatible(root, "IBM,CBEA"))
            return 0;

      pr_debug("pSeries detected, looking for LPAR capability...\n");

      /* Now try to figure out if we are running on LPAR */
      of_scan_flat_dt(pSeries_probe_hypertas, NULL);

      if (firmware_has_feature(FW_FEATURE_LPAR))
            hpte_init_lpar();
      else
            hpte_init_native();

      pr_debug("Machine is%s LPAR !\n",
               (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");

      return 1;
}


DECLARE_PER_CPU(unsigned long, smt_snooze_delay);

static void pseries_dedicated_idle_sleep(void)
{ 
      unsigned int cpu = smp_processor_id();
      unsigned long start_snooze;
      unsigned long in_purr, out_purr;

      /*
       * Indicate to the HV that we are idle. Now would be
       * a good time to find other work to dispatch.
       */
      get_lppaca()->idle = 1;
      get_lppaca()->donate_dedicated_cpu = 1;
      in_purr = mfspr(SPRN_PURR);

      /*
       * We come in with interrupts disabled, and need_resched()
       * has been checked recently.  If we should poll for a little
       * while, do so.
       */
      if (__get_cpu_var(smt_snooze_delay)) {
            start_snooze = get_tb() +
                  __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
            local_irq_enable();
            set_thread_flag(TIF_POLLING_NRFLAG);

            while (get_tb() < start_snooze) {
                  if (need_resched() || cpu_is_offline(cpu))
                        goto out;
                  ppc64_runlatch_off();
                  HMT_low();
                  HMT_very_low();
            }

            HMT_medium();
            clear_thread_flag(TIF_POLLING_NRFLAG);
            smp_mb();
            local_irq_disable();
            if (need_resched() || cpu_is_offline(cpu))
                  goto out;
      }

      cede_processor();

out:
      HMT_medium();
      out_purr = mfspr(SPRN_PURR);
      get_lppaca()->wait_state_cycles += out_purr - in_purr;
      get_lppaca()->donate_dedicated_cpu = 0;
      get_lppaca()->idle = 0;
}

static void pseries_shared_idle_sleep(void)
{
      /*
       * Indicate to the HV that we are idle. Now would be
       * a good time to find other work to dispatch.
       */
      get_lppaca()->idle = 1;

      /*
       * Yield the processor to the hypervisor.  We return if
       * an external interrupt occurs (which are driven prior
       * to returning here) or if a prod occurs from another
       * processor. When returning here, external interrupts
       * are enabled.
       */
      cede_processor();

      get_lppaca()->idle = 0;
}

static int pSeries_pci_probe_mode(struct pci_bus *bus)
{
      if (firmware_has_feature(FW_FEATURE_LPAR))
            return PCI_PROBE_DEVTREE;
      return PCI_PROBE_NORMAL;
}

/**
 * pSeries_power_off - tell firmware about how to power off the system.
 *
 * This function calls either the power-off rtas token in normal cases
 * or the ibm,power-off-ups token (if present & requested) in case of
 * a power failure. If power-off token is used, power on will only be
 * possible with power button press. If ibm,power-off-ups token is used
 * it will allow auto poweron after power is restored.
 */
static void pSeries_power_off(void)
{
      int rc;
      int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");

      if (rtas_flash_term_hook)
            rtas_flash_term_hook(SYS_POWER_OFF);

      if (rtas_poweron_auto == 0 ||
            rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
            rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
            printk(KERN_INFO "RTAS power-off returned %d\n", rc);
      } else {
            rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
            printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
      }
      for (;;);
}

#ifndef CONFIG_PCI
void pSeries_final_fixup(void) { }
#endif

define_machine(pseries) {
      .name             = "pSeries",
      .probe                  = pSeries_probe,
      .setup_arch       = pSeries_setup_arch,
      .init_early       = pSeries_init_early,
      .show_cpuinfo           = pSeries_show_cpuinfo,
      .log_error        = pSeries_log_error,
      .pcibios_fixup          = pSeries_final_fixup,
      .pci_probe_mode         = pSeries_pci_probe_mode,
      .restart          = rtas_restart,
      .power_off        = pSeries_power_off,
      .halt             = rtas_halt,
      .panic                  = rtas_os_term,
      .get_boot_time          = rtas_get_boot_time,
      .get_rtc_time           = rtas_get_rtc_time,
      .set_rtc_time           = rtas_set_rtc_time,
      .calibrate_decr         = generic_calibrate_decr,
      .progress         = rtas_progress,
      .system_reset_exception = pSeries_system_reset_exception,
      .machine_check_exception = pSeries_machine_check_exception,
};

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