Logo Search packages:      
Sourcecode: linux version File versions

pervasive.c

/*
 * CBE Pervasive Monitor and Debug
 *
 * (C) Copyright IBM Corporation 2005
 *
 * Authors: Maximino Aguilar (maguilar@us.ibm.com)
 *          Michael N. Day (mnday@us.ibm.com)
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#undef DEBUG

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/percpu.h>
#include <linux/types.h>
#include <linux/kallsyms.h>

#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/pgtable.h>
#include <asm/reg.h>
#include <asm/cell-regs.h>

#include "pervasive.h"

static void cbe_power_save(void)
{
      unsigned long ctrl, thread_switch_control;

      /*
       * We need to hard disable interrupts, the local_irq_enable() done by
       * our caller upon return will hard re-enable.
       */
      hard_irq_disable();

      ctrl = mfspr(SPRN_CTRLF);

      /* Enable DEC and EE interrupt request */
      thread_switch_control  = mfspr(SPRN_TSC_CELL);
      thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;

      switch (ctrl & CTRL_CT) {
      case CTRL_CT0:
            thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
            break;
      case CTRL_CT1:
            thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
            break;
      default:
            printk(KERN_WARNING "%s: unknown configuration\n",
                  __func__);
            break;
      }
      mtspr(SPRN_TSC_CELL, thread_switch_control);

      /*
       * go into low thread priority, medium priority will be
       * restored for us after wake-up.
       */
      HMT_low();

      /*
       * atomically disable thread execution and runlatch.
       * External and Decrementer exceptions are still handled when the
       * thread is disabled but now enter in cbe_system_reset_exception()
       */
      ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
      mtspr(SPRN_CTRLT, ctrl);
}

static int cbe_system_reset_exception(struct pt_regs *regs)
{
      switch (regs->msr & SRR1_WAKEMASK) {
      case SRR1_WAKEEE:
            do_IRQ(regs);
            break;
      case SRR1_WAKEDEC:
            timer_interrupt(regs);
            break;
      case SRR1_WAKEMT:
            return cbe_sysreset_hack();
#ifdef CONFIG_CBE_RAS
      case SRR1_WAKESYSERR:
            cbe_system_error_exception(regs);
            break;
      case SRR1_WAKETHERM:
            cbe_thermal_exception(regs);
            break;
#endif /* CONFIG_CBE_RAS */
      default:
            /* do system reset */
            return 0;
      }
      /* everything handled */
      return 1;
}

void __init cbe_pervasive_init(void)
{
      int cpu;

      if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
            return;

      for_each_possible_cpu(cpu) {
            struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu);
            if (!regs)
                  continue;

             /* Enable Pause(0) control bit */
            out_be64(&regs->pmcr, in_be64(&regs->pmcr) |
                                  CBE_PMD_PAUSE_ZERO_CONTROL);
      }

      ppc_md.power_save = cbe_power_save;
      ppc_md.system_reset_exception = cbe_system_reset_exception;
}

Generated by  Doxygen 1.6.0   Back to index