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rtas.c

/*
 *
 * Procedures for interfacing to the RTAS on CHRP machines.
 *
 * Peter Bergner, IBM   March 2001.
 * Copyright (C) 2001 IBM.
 *
 *      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.
 */

#include <stdarg.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/completion.h>
#include <linux/cpumask.h>

#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/hvcall.h>
#include <asm/semaphore.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/page.h>
#include <asm/param.h>
#include <asm/system.h>
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <asm/lmb.h>
#include <asm/udbg.h>
#include <asm/syscalls.h>
#include <asm/smp.h>
#include <asm/atomic.h>

struct rtas_t rtas = {
      .lock = SPIN_LOCK_UNLOCKED
};
EXPORT_SYMBOL(rtas);

struct rtas_suspend_me_data {
      atomic_t working; /* number of cpus accessing this struct */
      int token; /* ibm,suspend-me */
      int error;
      struct completion *complete; /* wait on this until working == 0 */
};

DEFINE_SPINLOCK(rtas_data_buf_lock);
EXPORT_SYMBOL(rtas_data_buf_lock);

char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;
EXPORT_SYMBOL(rtas_data_buf);

unsigned long rtas_rmo_buf;

/*
 * If non-NULL, this gets called when the kernel terminates.
 * This is done like this so rtas_flash can be a module.
 */
void (*rtas_flash_term_hook)(int);
EXPORT_SYMBOL(rtas_flash_term_hook);

/*
 * call_rtas_display_status and call_rtas_display_status_delay
 * are designed only for very early low-level debugging, which
 * is why the token is hard-coded to 10.
 */
static void call_rtas_display_status(char c)
{
      struct rtas_args *args = &rtas.args;
      unsigned long s;

      if (!rtas.base)
            return;
      spin_lock_irqsave(&rtas.lock, s);

      args->token = 10;
      args->nargs = 1;
      args->nret  = 1;
      args->rets  = (rtas_arg_t *)&(args->args[1]);
      args->args[0] = (unsigned char)c;

      enter_rtas(__pa(args));

      spin_unlock_irqrestore(&rtas.lock, s);
}

static void call_rtas_display_status_delay(char c)
{
      static int pending_newline = 0;  /* did last write end with unprinted newline? */
      static int width = 16;

      if (c == '\n') {  
            while (width-- > 0)
                  call_rtas_display_status(' ');
            width = 16;
            mdelay(500);
            pending_newline = 1;
      } else {
            if (pending_newline) {
                  call_rtas_display_status('\r');
                  call_rtas_display_status('\n');
            } 
            pending_newline = 0;
            if (width--) {
                  call_rtas_display_status(c);
                  udelay(10000);
            }
      }
}

void __init udbg_init_rtas_panel(void)
{
      udbg_putc = call_rtas_display_status_delay;
}

#ifdef CONFIG_UDBG_RTAS_CONSOLE

/* If you think you're dying before early_init_dt_scan_rtas() does its
 * work, you can hard code the token values for your firmware here and
 * hardcode rtas.base/entry etc.
 */
static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;
static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE;

static void udbg_rtascon_putc(char c)
{
      int tries;

      if (!rtas.base)
            return;

      /* Add CRs before LFs */
      if (c == '\n')
            udbg_rtascon_putc('\r');

      /* if there is more than one character to be displayed, wait a bit */
      for (tries = 0; tries < 16; tries++) {
            if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0)
                  break;
            udelay(1000);
      }
}

static int udbg_rtascon_getc_poll(void)
{
      int c;

      if (!rtas.base)
            return -1;

      if (rtas_call(rtas_getchar_token, 0, 2, &c))
            return -1;

      return c;
}

static int udbg_rtascon_getc(void)
{
      int c;

      while ((c = udbg_rtascon_getc_poll()) == -1)
            ;

      return c;
}


void __init udbg_init_rtas_console(void)
{
      udbg_putc = udbg_rtascon_putc;
      udbg_getc = udbg_rtascon_getc;
      udbg_getc_poll = udbg_rtascon_getc_poll;
}
#endif /* CONFIG_UDBG_RTAS_CONSOLE */

void rtas_progress(char *s, unsigned short hex)
{
      struct device_node *root;
      int width;
      const int *p;
      char *os;
      static int display_character, set_indicator;
      static int display_width, display_lines, form_feed;
      static const int *row_width;
      static DEFINE_SPINLOCK(progress_lock);
      static int current_line;
      static int pending_newline = 0;  /* did last write end with unprinted newline? */

      if (!rtas.base)
            return;

      if (display_width == 0) {
            display_width = 0x10;
            if ((root = of_find_node_by_path("/rtas"))) {
                  if ((p = of_get_property(root,
                              "ibm,display-line-length", NULL)))
                        display_width = *p;
                  if ((p = of_get_property(root,
                              "ibm,form-feed", NULL)))
                        form_feed = *p;
                  if ((p = of_get_property(root,
                              "ibm,display-number-of-lines", NULL)))
                        display_lines = *p;
                  row_width = of_get_property(root,
                              "ibm,display-truncation-length", NULL);
                  of_node_put(root);
            }
            display_character = rtas_token("display-character");
            set_indicator = rtas_token("set-indicator");
      }

      if (display_character == RTAS_UNKNOWN_SERVICE) {
            /* use hex display if available */
            if (set_indicator != RTAS_UNKNOWN_SERVICE)
                  rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
            return;
      }

      spin_lock(&progress_lock);

      /*
       * Last write ended with newline, but we didn't print it since
       * it would just clear the bottom line of output. Print it now
       * instead.
       *
       * If no newline is pending and form feed is supported, clear the
       * display with a form feed; otherwise, print a CR to start output
       * at the beginning of the line.
       */
      if (pending_newline) {
            rtas_call(display_character, 1, 1, NULL, '\r');
            rtas_call(display_character, 1, 1, NULL, '\n');
            pending_newline = 0;
      } else {
            current_line = 0;
            if (form_feed)
                  rtas_call(display_character, 1, 1, NULL,
                          (char)form_feed);
            else
                  rtas_call(display_character, 1, 1, NULL, '\r');
      }
 
      if (row_width)
            width = row_width[current_line];
      else
            width = display_width;
      os = s;
      while (*os) {
            if (*os == '\n' || *os == '\r') {
                  /* If newline is the last character, save it
                   * until next call to avoid bumping up the
                   * display output.
                   */
                  if (*os == '\n' && !os[1]) {
                        pending_newline = 1;
                        current_line++;
                        if (current_line > display_lines-1)
                              current_line = display_lines-1;
                        spin_unlock(&progress_lock);
                        return;
                  }
 
                  /* RTAS wants CR-LF, not just LF */
 
                  if (*os == '\n') {
                        rtas_call(display_character, 1, 1, NULL, '\r');
                        rtas_call(display_character, 1, 1, NULL, '\n');
                  } else {
                        /* CR might be used to re-draw a line, so we'll
                         * leave it alone and not add LF.
                         */
                        rtas_call(display_character, 1, 1, NULL, *os);
                  }
 
                  if (row_width)
                        width = row_width[current_line];
                  else
                        width = display_width;
            } else {
                  width--;
                  rtas_call(display_character, 1, 1, NULL, *os);
            }
 
            os++;
 
            /* if we overwrite the screen length */
            if (width <= 0)
                  while ((*os != 0) && (*os != '\n') && (*os != '\r'))
                        os++;
      }
 
      spin_unlock(&progress_lock);
}
EXPORT_SYMBOL(rtas_progress);       /* needed by rtas_flash module */

int rtas_token(const char *service)
{
      const int *tokp;
      if (rtas.dev == NULL)
            return RTAS_UNKNOWN_SERVICE;
      tokp = of_get_property(rtas.dev, service, NULL);
      return tokp ? *tokp : RTAS_UNKNOWN_SERVICE;
}
EXPORT_SYMBOL(rtas_token);

int rtas_service_present(const char *service)
{
      return rtas_token(service) != RTAS_UNKNOWN_SERVICE;
}
EXPORT_SYMBOL(rtas_service_present);

#ifdef CONFIG_RTAS_ERROR_LOGGING
/*
 * Return the firmware-specified size of the error log buffer
 *  for all rtas calls that require an error buffer argument.
 *  This includes 'check-exception' and 'rtas-last-error'.
 */
int rtas_get_error_log_max(void)
{
      static int rtas_error_log_max;
      if (rtas_error_log_max)
            return rtas_error_log_max;

      rtas_error_log_max = rtas_token ("rtas-error-log-max");
      if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
          (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
            printk (KERN_WARNING "RTAS: bad log buffer size %d\n",
                  rtas_error_log_max);
            rtas_error_log_max = RTAS_ERROR_LOG_MAX;
      }
      return rtas_error_log_max;
}
EXPORT_SYMBOL(rtas_get_error_log_max);


char rtas_err_buf[RTAS_ERROR_LOG_MAX];
int rtas_last_error_token;

/** Return a copy of the detailed error text associated with the
 *  most recent failed call to rtas.  Because the error text
 *  might go stale if there are any other intervening rtas calls,
 *  this routine must be called atomically with whatever produced
 *  the error (i.e. with rtas.lock still held from the previous call).
 */
static char *__fetch_rtas_last_error(char *altbuf)
{
      struct rtas_args err_args, save_args;
      u32 bufsz;
      char *buf = NULL;

      if (rtas_last_error_token == -1)
            return NULL;

      bufsz = rtas_get_error_log_max();

      err_args.token = rtas_last_error_token;
      err_args.nargs = 2;
      err_args.nret = 1;
      err_args.args[0] = (rtas_arg_t)__pa(rtas_err_buf);
      err_args.args[1] = bufsz;
      err_args.args[2] = 0;

      save_args = rtas.args;
      rtas.args = err_args;

      enter_rtas(__pa(&rtas.args));

      err_args = rtas.args;
      rtas.args = save_args;

      /* Log the error in the unlikely case that there was one. */
      if (unlikely(err_args.args[2] == 0)) {
            if (altbuf) {
                  buf = altbuf;
            } else {
                  buf = rtas_err_buf;
                  if (mem_init_done)
                        buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC);
            }
            if (buf)
                  memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX);
      }

      return buf;
}

#define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL)

#else /* CONFIG_RTAS_ERROR_LOGGING */
#define __fetch_rtas_last_error(x)  NULL
#define get_errorlog_buffer()       NULL
#endif

int rtas_call(int token, int nargs, int nret, int *outputs, ...)
{
      va_list list;
      int i;
      unsigned long s;
      struct rtas_args *rtas_args;
      char *buff_copy = NULL;
      int ret;

      if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
            return -1;

      /* Gotta do something different here, use global lock for now... */
      spin_lock_irqsave(&rtas.lock, s);
      rtas_args = &rtas.args;

      rtas_args->token = token;
      rtas_args->nargs = nargs;
      rtas_args->nret  = nret;
      rtas_args->rets  = (rtas_arg_t *)&(rtas_args->args[nargs]);
      va_start(list, outputs);
      for (i = 0; i < nargs; ++i)
            rtas_args->args[i] = va_arg(list, rtas_arg_t);
      va_end(list);

      for (i = 0; i < nret; ++i)
            rtas_args->rets[i] = 0;

      enter_rtas(__pa(rtas_args));

      /* A -1 return code indicates that the last command couldn't
         be completed due to a hardware error. */
      if (rtas_args->rets[0] == -1)
            buff_copy = __fetch_rtas_last_error(NULL);

      if (nret > 1 && outputs != NULL)
            for (i = 0; i < nret-1; ++i)
                  outputs[i] = rtas_args->rets[i+1];
      ret = (nret > 0)? rtas_args->rets[0]: 0;

      /* Gotta do something different here, use global lock for now... */
      spin_unlock_irqrestore(&rtas.lock, s);

      if (buff_copy) {
            log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
            if (mem_init_done)
                  kfree(buff_copy);
      }
      return ret;
}
EXPORT_SYMBOL(rtas_call);

/* For RTAS_BUSY (-2), delay for 1 millisecond.  For an extended busy status
 * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds.
 */
unsigned int rtas_busy_delay_time(int status)
{
      int order;
      unsigned int ms = 0;

      if (status == RTAS_BUSY) {
            ms = 1;
      } else if (status >= 9900 && status <= 9905) {
            order = status - 9900;
            for (ms = 1; order > 0; order--)
                  ms *= 10;
      }

      return ms;
}
EXPORT_SYMBOL(rtas_busy_delay_time);

/* For an RTAS busy status code, perform the hinted delay. */
unsigned int rtas_busy_delay(int status)
{
      unsigned int ms;

      might_sleep();
      ms = rtas_busy_delay_time(status);
      if (ms)
            msleep(ms);

      return ms;
}
EXPORT_SYMBOL(rtas_busy_delay);

int rtas_error_rc(int rtas_rc)
{
      int rc;

      switch (rtas_rc) {
            case -1:          /* Hardware Error */
                  rc = -EIO;
                  break;
            case -3:          /* Bad indicator/domain/etc */
                  rc = -EINVAL;
                  break;
            case -9000:       /* Isolation error */
                  rc = -EFAULT;
                  break;
            case -9001:       /* Outstanding TCE/PTE */
                  rc = -EEXIST;
                  break;
            case -9002:       /* No usable slot */
                  rc = -ENODEV;
                  break;
            default:
                  printk(KERN_ERR "%s: unexpected RTAS error %d\n",
                              __FUNCTION__, rtas_rc);
                  rc = -ERANGE;
                  break;
      }
      return rc;
}

int rtas_get_power_level(int powerdomain, int *level)
{
      int token = rtas_token("get-power-level");
      int rc;

      if (token == RTAS_UNKNOWN_SERVICE)
            return -ENOENT;

      while ((rc = rtas_call(token, 1, 2, level, powerdomain)) == RTAS_BUSY)
            udelay(1);

      if (rc < 0)
            return rtas_error_rc(rc);
      return rc;
}
EXPORT_SYMBOL(rtas_get_power_level);

int rtas_set_power_level(int powerdomain, int level, int *setlevel)
{
      int token = rtas_token("set-power-level");
      int rc;

      if (token == RTAS_UNKNOWN_SERVICE)
            return -ENOENT;

      do {
            rc = rtas_call(token, 2, 2, setlevel, powerdomain, level);
      } while (rtas_busy_delay(rc));

      if (rc < 0)
            return rtas_error_rc(rc);
      return rc;
}
EXPORT_SYMBOL(rtas_set_power_level);

int rtas_get_sensor(int sensor, int index, int *state)
{
      int token = rtas_token("get-sensor-state");
      int rc;

      if (token == RTAS_UNKNOWN_SERVICE)
            return -ENOENT;

      do {
            rc = rtas_call(token, 2, 2, state, sensor, index);
      } while (rtas_busy_delay(rc));

      if (rc < 0)
            return rtas_error_rc(rc);
      return rc;
}
EXPORT_SYMBOL(rtas_get_sensor);

int rtas_set_indicator(int indicator, int index, int new_value)
{
      int token = rtas_token("set-indicator");
      int rc;

      if (token == RTAS_UNKNOWN_SERVICE)
            return -ENOENT;

      do {
            rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);
      } while (rtas_busy_delay(rc));

      if (rc < 0)
            return rtas_error_rc(rc);
      return rc;
}
EXPORT_SYMBOL(rtas_set_indicator);

/*
 * Ignoring RTAS extended delay
 */
int rtas_set_indicator_fast(int indicator, int index, int new_value)
{
      int rc;
      int token = rtas_token("set-indicator");

      if (token == RTAS_UNKNOWN_SERVICE)
            return -ENOENT;

      rc = rtas_call(token, 3, 1, NULL, indicator, index, new_value);

      WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));

      if (rc < 0)
            return rtas_error_rc(rc);

      return rc;
}

void rtas_restart(char *cmd)
{
      if (rtas_flash_term_hook)
            rtas_flash_term_hook(SYS_RESTART);
      printk("RTAS system-reboot returned %d\n",
             rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
      for (;;);
}

void rtas_power_off(void)
{
      if (rtas_flash_term_hook)
            rtas_flash_term_hook(SYS_POWER_OFF);
      /* allow power on only with power button press */
      printk("RTAS power-off returned %d\n",
             rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
      for (;;);
}

void rtas_halt(void)
{
      if (rtas_flash_term_hook)
            rtas_flash_term_hook(SYS_HALT);
      /* allow power on only with power button press */
      printk("RTAS power-off returned %d\n",
             rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
      for (;;);
}

/* Must be in the RMO region, so we place it here */
static char rtas_os_term_buf[2048];

void rtas_os_term(char *str)
{
      int status;

      if (panic_timeout)
            return;

      if (RTAS_UNKNOWN_SERVICE == rtas_token("ibm,os-term"))
            return;

      snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);

      do {
            status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
                           __pa(rtas_os_term_buf));
      } while (rtas_busy_delay(status));

      if (status != 0)
            printk(KERN_EMERG "ibm,os-term call failed %d\n",
                         status);
}

static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE;
#ifdef CONFIG_PPC_PSERIES
static void rtas_percpu_suspend_me(void *info)
{
      long rc;
      unsigned long msr_save;
      int cpu;
      struct rtas_suspend_me_data *data =
            (struct rtas_suspend_me_data *)info;

      atomic_inc(&data->working);

      /* really need to ensure MSR.EE is off for H_JOIN */
      msr_save = mfmsr();
      mtmsr(msr_save & ~(MSR_EE));

      rc = plpar_hcall_norets(H_JOIN);

      mtmsr(msr_save);

      if (rc == H_SUCCESS) {
            /* This cpu was prodded and the suspend is complete. */
            goto out;
      } else if (rc == H_CONTINUE) {
            /* All other cpus are in H_JOIN, this cpu does
             * the suspend.
             */
            printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n",
                   smp_processor_id());
            data->error = rtas_call(data->token, 0, 1, NULL);

            if (data->error)
                  printk(KERN_DEBUG "ibm,suspend-me returned %d\n",
                         data->error);
      } else {
            printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n",
                   smp_processor_id(), rc);
            data->error = rc;
      }
      /* This cpu did the suspend or got an error; in either case,
       * we need to prod all other other cpus out of join state.
       * Extra prods are harmless.
       */
      for_each_online_cpu(cpu)
            plpar_hcall_norets(H_PROD, get_hard_smp_processor_id(cpu));
out:
      if (atomic_dec_return(&data->working) == 0)
            complete(data->complete);
}

static int rtas_ibm_suspend_me(struct rtas_args *args)
{
      long state;
      long rc;
      unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
      struct rtas_suspend_me_data data;
      DECLARE_COMPLETION_ONSTACK(done);

      if (!rtas_service_present("ibm,suspend-me"))
            return -ENOSYS;

      /* Make sure the state is valid */
      rc = plpar_hcall(H_VASI_STATE, retbuf,
                   ((u64)args->args[0] << 32) | args->args[1]);

      state = retbuf[0];

      if (rc) {
            printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc);
            return rc;
      } else if (state == H_VASI_ENABLED) {
            args->args[args->nargs] = RTAS_NOT_SUSPENDABLE;
            return 0;
      } else if (state != H_VASI_SUSPENDING) {
            printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n",
                   state);
            args->args[args->nargs] = -1;
            return 0;
      }

      atomic_set(&data.working, 0);
      data.token = rtas_token("ibm,suspend-me");
      data.error = 0;
      data.complete = &done;

      /* Call function on all CPUs.  One of us will make the
       * rtas call
       */
      if (on_each_cpu(rtas_percpu_suspend_me, &data, 1, 0))
            data.error = -EINVAL;

      wait_for_completion(&done);

      if (data.error != 0)
            printk(KERN_ERR "Error doing global join\n");

      return data.error;
}
#else /* CONFIG_PPC_PSERIES */
static int rtas_ibm_suspend_me(struct rtas_args *args)
{
      return -ENOSYS;
}
#endif

asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
{
      struct rtas_args args;
      unsigned long flags;
      char *buff_copy, *errbuf = NULL;
      int nargs;
      int rc;

      if (!capable(CAP_SYS_ADMIN))
            return -EPERM;

      if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
            return -EFAULT;

      nargs = args.nargs;
      if (nargs > ARRAY_SIZE(args.args)
          || args.nret > ARRAY_SIZE(args.args)
          || nargs + args.nret > ARRAY_SIZE(args.args))
            return -EINVAL;

      /* Copy in args. */
      if (copy_from_user(args.args, uargs->args,
                     nargs * sizeof(rtas_arg_t)) != 0)
            return -EFAULT;

      if (args.token == RTAS_UNKNOWN_SERVICE)
            return -EINVAL;

      /* Need to handle ibm,suspend_me call specially */
      if (args.token == ibm_suspend_me_token) {
            rc = rtas_ibm_suspend_me(&args);
            if (rc)
                  return rc;
            goto copy_return;
      }

      buff_copy = get_errorlog_buffer();

      spin_lock_irqsave(&rtas.lock, flags);

      rtas.args = args;
      enter_rtas(__pa(&rtas.args));
      args = rtas.args;

      args.rets = &args.args[nargs];

      /* A -1 return code indicates that the last command couldn't
         be completed due to a hardware error. */
      if (args.rets[0] == -1)
            errbuf = __fetch_rtas_last_error(buff_copy);

      spin_unlock_irqrestore(&rtas.lock, flags);

      if (buff_copy) {
            if (errbuf)
                  log_error(errbuf, ERR_TYPE_RTAS_LOG, 0);
            kfree(buff_copy);
      }

 copy_return:
      /* Copy out args. */
      if (copy_to_user(uargs->args + nargs,
                   args.args + nargs,
                   args.nret * sizeof(rtas_arg_t)) != 0)
            return -EFAULT;

      return 0;
}

/*
 * Call early during boot, before mem init or bootmem, to retrieve the RTAS
 * informations from the device-tree and allocate the RMO buffer for userland
 * accesses.
 */
void __init rtas_initialize(void)
{
      unsigned long rtas_region = RTAS_INSTANTIATE_MAX;

      /* Get RTAS dev node and fill up our "rtas" structure with infos
       * about it.
       */
      rtas.dev = of_find_node_by_name(NULL, "rtas");
      if (rtas.dev) {
            const u32 *basep, *entryp, *sizep;

            basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
            sizep = of_get_property(rtas.dev, "rtas-size", NULL);
            if (basep != NULL && sizep != NULL) {
                  rtas.base = *basep;
                  rtas.size = *sizep;
                  entryp = of_get_property(rtas.dev,
                              "linux,rtas-entry", NULL);
                  if (entryp == NULL) /* Ugh */
                        rtas.entry = rtas.base;
                  else
                        rtas.entry = *entryp;
            } else
                  rtas.dev = NULL;
      }
      if (!rtas.dev)
            return;

      /* If RTAS was found, allocate the RMO buffer for it and look for
       * the stop-self token if any
       */
#ifdef CONFIG_PPC64
      if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR)) {
            rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);
            ibm_suspend_me_token = rtas_token("ibm,suspend-me");
      }
#endif
      rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);

#ifdef CONFIG_RTAS_ERROR_LOGGING
      rtas_last_error_token = rtas_token("rtas-last-error");
#endif
}

int __init early_init_dt_scan_rtas(unsigned long node,
            const char *uname, int depth, void *data)
{
      u32 *basep, *entryp, *sizep;

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

      basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);
      entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
      sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);

      if (basep && entryp && sizep) {
            rtas.base = *basep;
            rtas.entry = *entryp;
            rtas.size = *sizep;
      }

#ifdef CONFIG_UDBG_RTAS_CONSOLE
      basep = of_get_flat_dt_prop(node, "put-term-char", NULL);
      if (basep)
            rtas_putchar_token = *basep;

      basep = of_get_flat_dt_prop(node, "get-term-char", NULL);
      if (basep)
            rtas_getchar_token = *basep;

      if (rtas_putchar_token != RTAS_UNKNOWN_SERVICE &&
          rtas_getchar_token != RTAS_UNKNOWN_SERVICE)
            udbg_init_rtas_console();

#endif

      /* break now */
      return 1;
}

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