168 lines
4.0 KiB
C
168 lines
4.0 KiB
C
/*
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* CBE Pervasive Monitor and Debug
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*
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* (C) Copyright IBM Corporation 2005
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*
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* Authors: Maximino Aguilar (maguilar@us.ibm.com)
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* Michael N. Day (mnday@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#undef DEBUG
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#include <linux/config.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/percpu.h>
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#include <linux/types.h>
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#include <linux/kallsyms.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/pgtable.h>
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#include <asm/reg.h>
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#include "pervasive.h"
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#include "cbe_regs.h"
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static DEFINE_SPINLOCK(cbe_pervasive_lock);
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static void __init cbe_enable_pause_zero(void)
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{
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unsigned long thread_switch_control;
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unsigned long temp_register;
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struct cbe_pmd_regs __iomem *pregs;
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spin_lock_irq(&cbe_pervasive_lock);
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pregs = cbe_get_cpu_pmd_regs(smp_processor_id());
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if (pregs == NULL)
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goto out;
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pr_debug("Power Management: CPU %d\n", smp_processor_id());
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/* Enable Pause(0) control bit */
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temp_register = in_be64(&pregs->pm_control);
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out_be64(&pregs->pm_control,
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temp_register | CBE_PMD_PAUSE_ZERO_CONTROL);
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/* Enable DEC and EE interrupt request */
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thread_switch_control = mfspr(SPRN_TSC_CELL);
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thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
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switch ((mfspr(SPRN_CTRLF) & CTRL_CT)) {
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case CTRL_CT0:
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thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
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break;
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case CTRL_CT1:
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thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
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break;
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default:
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printk(KERN_WARNING "%s: unknown configuration\n",
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__FUNCTION__);
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break;
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}
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mtspr(SPRN_TSC_CELL, thread_switch_control);
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out:
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spin_unlock_irq(&cbe_pervasive_lock);
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}
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static void cbe_idle(void)
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{
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unsigned long ctrl;
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/* Why do we do that on every idle ? Couldn't that be done once for
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* all or do we lose the state some way ? Also, the pm_control
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* register setting, that can't be set once at boot ? We really want
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* to move that away in order to implement a simple powersave
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*/
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cbe_enable_pause_zero();
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while (1) {
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if (!need_resched()) {
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local_irq_disable();
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while (!need_resched()) {
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/* go into low thread priority */
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HMT_low();
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/*
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* atomically disable thread execution
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* and runlatch.
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* External and Decrementer exceptions
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* are still handled when the thread
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* is disabled but now enter in
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* cbe_system_reset_exception()
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*/
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ctrl = mfspr(SPRN_CTRLF);
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ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
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mtspr(SPRN_CTRLT, ctrl);
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}
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/* restore thread prio */
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HMT_medium();
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local_irq_enable();
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}
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/*
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* turn runlatch on again before scheduling the
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* process we just woke up
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*/
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ppc64_runlatch_on();
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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}
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}
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static int cbe_system_reset_exception(struct pt_regs *regs)
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{
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switch (regs->msr & SRR1_WAKEMASK) {
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case SRR1_WAKEEE:
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do_IRQ(regs);
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break;
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case SRR1_WAKEDEC:
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timer_interrupt(regs);
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break;
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case SRR1_WAKEMT:
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break;
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#ifdef CONFIG_CBE_RAS
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case SRR1_WAKESYSERR:
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cbe_system_error_exception(regs);
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break;
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case SRR1_WAKETHERM:
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cbe_thermal_exception(regs);
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break;
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#endif /* CONFIG_CBE_RAS */
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default:
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/* do system reset */
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return 0;
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}
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/* everything handled */
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return 1;
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}
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void __init cbe_pervasive_init(void)
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{
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if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
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return;
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ppc_md.idle_loop = cbe_idle;
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ppc_md.system_reset_exception = cbe_system_reset_exception;
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}
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