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setup-common.c

/*
 * Common boot and setup code for both 32-bit and 64-bit.
 * Extracted from arch/powerpc/kernel/setup_64.c.
 *
 * Copyright (C) 2001 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.
 */

#undef DEBUG

#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/utsname.h>
#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/debugfs.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/lmb.h>
#include <asm/xmon.h>

#include "setup.h"

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/* The main machine-dep calls structure
 */
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);
struct machdep_calls *machine_id;
EXPORT_SYMBOL(machine_id);

unsigned long klimit = (unsigned long) _end;

char cmd_line[COMMAND_LINE_SIZE];

/*
 * This still seems to be needed... -- paulus
 */ 
struct screen_info screen_info = {
      .orig_x = 0,
      .orig_y = 25,
      .orig_video_cols = 80,
      .orig_video_lines = 25,
      .orig_video_isVGA = 1,
      .orig_video_points = 16
};

#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

/* also used by kexec */
void machine_shutdown(void)
{
      if (ppc_md.machine_shutdown)
            ppc_md.machine_shutdown();
}

void machine_restart(char *cmd)
{
      machine_shutdown();
      if (ppc_md.restart)
            ppc_md.restart(cmd);
#ifdef CONFIG_SMP
      smp_send_stop();
#endif
      printk(KERN_EMERG "System Halted, OK to turn off power\n");
      local_irq_disable();
      while (1) ;
}

void machine_power_off(void)
{
      machine_shutdown();
      if (ppc_md.power_off)
            ppc_md.power_off();
#ifdef CONFIG_SMP
      smp_send_stop();
#endif
      printk(KERN_EMERG "System Halted, OK to turn off power\n");
      local_irq_disable();
      while (1) ;
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);

void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL_GPL(pm_power_off);

void machine_halt(void)
{
      machine_shutdown();
      if (ppc_md.halt)
            ppc_md.halt();
#ifdef CONFIG_SMP
      smp_send_stop();
#endif
      printk(KERN_EMERG "System Halted, OK to turn off power\n");
      local_irq_disable();
      while (1) ;
}


#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, pvr);
#endif

static int show_cpuinfo(struct seq_file *m, void *v)
{
      unsigned long cpu_id = (unsigned long)v - 1;
      unsigned int pvr;
      unsigned short maj;
      unsigned short min;

      if (cpu_id == NR_CPUS) {
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
            unsigned long bogosum = 0;
            int i;
            for_each_online_cpu(i)
                  bogosum += loops_per_jiffy;
            seq_printf(m, "total bogomips\t: %lu.%02lu\n",
                     bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP && CONFIG_PPC32 */
            seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
            if (ppc_md.name)
                  seq_printf(m, "platform\t: %s\n", ppc_md.name);
            if (ppc_md.show_cpuinfo != NULL)
                  ppc_md.show_cpuinfo(m);

            return 0;
      }

      /* We only show online cpus: disable preempt (overzealous, I
       * knew) to prevent cpu going down. */
      preempt_disable();
      if (!cpu_online(cpu_id)) {
            preempt_enable();
            return 0;
      }

#ifdef CONFIG_SMP
      pvr = per_cpu(pvr, cpu_id);
#else
      pvr = mfspr(SPRN_PVR);
#endif
      maj = (pvr >> 8) & 0xFF;
      min = pvr & 0xFF;

      seq_printf(m, "processor\t: %lu\n", cpu_id);
      seq_printf(m, "cpu\t\t: ");

      if (cur_cpu_spec->pvr_mask)
            seq_printf(m, "%s", cur_cpu_spec->cpu_name);
      else
            seq_printf(m, "unknown (%08x)", pvr);

#ifdef CONFIG_ALTIVEC
      if (cpu_has_feature(CPU_FTR_ALTIVEC))
            seq_printf(m, ", altivec supported");
#endif /* CONFIG_ALTIVEC */

      seq_printf(m, "\n");

#ifdef CONFIG_TAU
      if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
            /* more straightforward, but potentially misleading */
            seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
                     cpu_temp(cpu_id));
#else
            /* show the actual temp sensor range */
            u32 temp;
            temp = cpu_temp_both(cpu_id);
            seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
                     temp & 0xff, temp >> 16);
#endif
      }
#endif /* CONFIG_TAU */

      /*
       * Assume here that all clock rates are the same in a
       * smp system.  -- Cort
       */
      if (ppc_proc_freq)
            seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
                     ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);

      if (ppc_md.show_percpuinfo != NULL)
            ppc_md.show_percpuinfo(m, cpu_id);

      /* If we are a Freescale core do a simple check so
       * we dont have to keep adding cases in the future */
      if (PVR_VER(pvr) & 0x8000) {
            maj = PVR_MAJ(pvr);
            min = PVR_MIN(pvr);
      } else {
            switch (PVR_VER(pvr)) {
                  case 0x0020:      /* 403 family */
                        maj = PVR_MAJ(pvr) + 1;
                        min = PVR_MIN(pvr);
                        break;
                  case 0x1008:      /* 740P/750P ?? */
                        maj = ((pvr >> 8) & 0xFF) - 1;
                        min = pvr & 0xFF;
                        break;
                  default:
                        maj = (pvr >> 8) & 0xFF;
                        min = pvr & 0xFF;
                        break;
            }
      }

      seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
               maj, min, PVR_VER(pvr), PVR_REV(pvr));

#ifdef CONFIG_PPC32
      seq_printf(m, "bogomips\t: %lu.%02lu\n",
               loops_per_jiffy / (500000/HZ),
               (loops_per_jiffy / (5000/HZ)) % 100);
#endif

#ifdef CONFIG_SMP
      seq_printf(m, "\n");
#endif

      preempt_enable();
      return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
      unsigned long i = *pos;

      return i <= NR_CPUS ? (void *)(i + 1) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
      ++*pos;
      return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
      .start =c_start,
      .next =     c_next,
      .stop =     c_stop,
      .show =     show_cpuinfo,
};

void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
      DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
          initrd_start, initrd_end);

      /* If we were passed an initrd, set the ROOT_DEV properly if the values
       * look sensible. If not, clear initrd reference.
       */
      if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
          initrd_end > initrd_start)
            ROOT_DEV = Root_RAM0;
      else
            initrd_start = initrd_end = 0;

      if (initrd_start)
            printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

      DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}

#ifdef CONFIG_SMP

/**
 * setup_cpu_maps - initialize the following cpu maps:
 *                  cpu_possible_map
 *                  cpu_present_map
 *                  cpu_sibling_map
 *
 * Having the possible map set up early allows us to restrict allocations
 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 *
 * We do not initialize the online map here; cpus set their own bits in
 * cpu_online_map as they come up.
 *
 * This function is valid only for Open Firmware systems.  finish_device_tree
 * must be called before using this.
 *
 * While we're here, we may as well set the "physical" cpu ids in the paca.
 *
 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 */
void __init smp_setup_cpu_maps(void)
{
      struct device_node *dn = NULL;
      int cpu = 0;

      while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
            const int *intserv;
            int j, len = sizeof(u32), nthreads = 1;

            intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
                        &len);
            if (intserv)
                  nthreads = len / sizeof(int);
            else {
                  intserv = of_get_property(dn, "reg", NULL);
                  if (!intserv)
                        intserv = &cpu;   /* assume logical == phys */
            }

            for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
                  cpu_set(cpu, cpu_present_map);
                  set_hard_smp_processor_id(cpu, intserv[j]);
                  cpu_set(cpu, cpu_possible_map);
                  cpu++;
            }
      }

#ifdef CONFIG_PPC64
      /*
       * On pSeries LPAR, we need to know how many cpus
       * could possibly be added to this partition.
       */
      if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
          (dn = of_find_node_by_path("/rtas"))) {
            int num_addr_cell, num_size_cell, maxcpus;
            const unsigned int *ireg;

            num_addr_cell = of_n_addr_cells(dn);
            num_size_cell = of_n_size_cells(dn);

            ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

            if (!ireg)
                  goto out;

            maxcpus = ireg[num_addr_cell + num_size_cell];

            /* Double maxcpus for processors which have SMT capability */
            if (cpu_has_feature(CPU_FTR_SMT))
                  maxcpus *= 2;

            if (maxcpus > NR_CPUS) {
                  printk(KERN_WARNING
                         "Partition configured for %d cpus, "
                         "operating system maximum is %d.\n",
                         maxcpus, NR_CPUS);
                  maxcpus = NR_CPUS;
            } else
                  printk(KERN_INFO "Partition configured for %d cpus.\n",
                         maxcpus);

            for (cpu = 0; cpu < maxcpus; cpu++)
                  cpu_set(cpu, cpu_possible_map);
      out:
            of_node_put(dn);
      }

      vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
}

/*
 * Being that cpu_sibling_map is now a per_cpu array, then it cannot
 * be initialized until the per_cpu areas have been created.  This
 * function is now called from setup_per_cpu_areas().
 */
void __init smp_setup_cpu_sibling_map(void)
{
#if defined(CONFIG_PPC64)
      int cpu;

      /*
       * Do the sibling map; assume only two threads per processor.
       */
      for_each_possible_cpu(cpu) {
            cpu_set(cpu, per_cpu(cpu_sibling_map, cpu));
            if (cpu_has_feature(CPU_FTR_SMT))
                  cpu_set(cpu ^ 0x1, per_cpu(cpu_sibling_map, cpu));
      }
#endif /* CONFIG_PPC64 */
}
#endif /* CONFIG_SMP */

static __init int add_pcspkr(void)
{
      struct device_node *np;
      struct platform_device *pd;
      int ret;

      np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
      of_node_put(np);
      if (!np)
            return -ENODEV;

      pd = platform_device_alloc("pcspkr", -1);
      if (!pd)
            return -ENOMEM;

      ret = platform_device_add(pd);
      if (ret)
            platform_device_put(pd);

      return ret;
}
device_initcall(add_pcspkr);

void probe_machine(void)
{
      extern struct machdep_calls __machine_desc_start;
      extern struct machdep_calls __machine_desc_end;

      /*
       * Iterate all ppc_md structures until we find the proper
       * one for the current machine type
       */
      DBG("Probing machine type ...\n");

      for (machine_id = &__machine_desc_start;
           machine_id < &__machine_desc_end;
           machine_id++) {
            DBG("  %s ...", machine_id->name);
            memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
            if (ppc_md.probe()) {
                  DBG(" match !\n");
                  break;
            }
            DBG("\n");
      }
      /* What can we do if we didn't find ? */
      if (machine_id >= &__machine_desc_end) {
            DBG("No suitable machine found !\n");
            for (;;);
      }

      printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
}

/* Match a class of boards, not a specific device configuration. */
int check_legacy_ioport(unsigned long base_port)
{
      struct device_node *parent, *np = NULL;
      int ret = -ENODEV;

      switch(base_port) {
      case I8042_DATA_REG:
            if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
                  np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
            if (np) {
                  parent = of_get_parent(np);
                  of_node_put(np);
                  np = parent;
                  break;
            }
            np = of_find_node_by_type(NULL, "8042");
            /* Pegasos has no device_type on its 8042 node, look for the
             * name instead */
            if (!np)
                  np = of_find_node_by_name(NULL, "8042");
            break;
      case FDC_BASE: /* FDC1 */
            np = of_find_node_by_type(NULL, "fdc");
            break;
#ifdef CONFIG_PPC_PREP
      case _PIDXR:
      case _PNPWRP:
      case PNPBIOS_BASE:
            /* implement me */
#endif
      default:
            /* ipmi is supposed to fail here */
            break;
      }
      if (!np)
            return ret;
      parent = of_get_parent(np);
      if (parent) {
            if (strcmp(parent->type, "isa") == 0)
                  ret = 0;
            of_node_put(parent);
      }
      of_node_put(np);
      return ret;
}
EXPORT_SYMBOL(check_legacy_ioport);

static int ppc_panic_event(struct notifier_block *this,
                             unsigned long event, void *ptr)
{
      ppc_md.panic(ptr);  /* May not return */
      return NOTIFY_DONE;
}

static struct notifier_block ppc_panic_block = {
      .notifier_call = ppc_panic_event,
      .priority = INT_MIN /* may not return; must be done last */
};

void __init setup_panic(void)
{
      atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
}

#ifdef CONFIG_CHECK_CACHE_COHERENCY
/*
 * For platforms that have configurable cache-coherency.  This function
 * checks that the cache coherency setting of the kernel matches the setting
 * left by the firmware, as indicated in the device tree.  Since a mismatch
 * will eventually result in DMA failures, we print * and error and call
 * BUG() in that case.
 */

#ifdef CONFIG_NOT_COHERENT_CACHE
#define KERNEL_COHERENCY      0
#else
#define KERNEL_COHERENCY      1
#endif

static int __init check_cache_coherency(void)
{
      struct device_node *np;
      const void *prop;
      int devtree_coherency;

      np = of_find_node_by_path("/");
      prop = of_get_property(np, "coherency-off", NULL);
      of_node_put(np);

      devtree_coherency = prop ? 0 : 1;

      if (devtree_coherency != KERNEL_COHERENCY) {
            printk(KERN_ERR
                  "kernel coherency:%s != device tree_coherency:%s\n",
                  KERNEL_COHERENCY ? "on" : "off",
                  devtree_coherency ? "on" : "off");
            BUG();
      }

      return 0;
}

late_initcall(check_cache_coherency);
#endif /* CONFIG_CHECK_CACHE_COHERENCY */

#ifdef CONFIG_DEBUG_FS
struct dentry *powerpc_debugfs_root;

static int powerpc_debugfs_init(void)
{
      powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

      return powerpc_debugfs_root == NULL;
}
arch_initcall(powerpc_debugfs_init);
#endif

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