22b8c9f5ba
There are a few definitions that are required by subsequent patches, so add them here. The original patch is from David Erb, but is significantly cleaned up by Kevon Corry. Cc: Kevin Corry <kevcorry@us.ibm.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
167 lines
3.9 KiB
C
167 lines
3.9 KiB
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 "pervasive.h"
|
|
#include "cbe_regs.h"
|
|
|
|
static DEFINE_SPINLOCK(cbe_pervasive_lock);
|
|
|
|
static void __init cbe_enable_pause_zero(void)
|
|
{
|
|
unsigned long thread_switch_control;
|
|
unsigned long temp_register;
|
|
struct cbe_pmd_regs __iomem *pregs;
|
|
|
|
spin_lock_irq(&cbe_pervasive_lock);
|
|
pregs = cbe_get_cpu_pmd_regs(smp_processor_id());
|
|
if (pregs == NULL)
|
|
goto out;
|
|
|
|
pr_debug("Power Management: CPU %d\n", smp_processor_id());
|
|
|
|
/* Enable Pause(0) control bit */
|
|
temp_register = in_be64(&pregs->pmcr);
|
|
|
|
out_be64(&pregs->pmcr,
|
|
temp_register | CBE_PMD_PAUSE_ZERO_CONTROL);
|
|
|
|
/* 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 ((mfspr(SPRN_CTRLF) & 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",
|
|
__FUNCTION__);
|
|
break;
|
|
}
|
|
|
|
mtspr(SPRN_TSC_CELL, thread_switch_control);
|
|
|
|
out:
|
|
spin_unlock_irq(&cbe_pervasive_lock);
|
|
}
|
|
|
|
static void cbe_idle(void)
|
|
{
|
|
unsigned long ctrl;
|
|
|
|
/* Why do we do that on every idle ? Couldn't that be done once for
|
|
* all or do we lose the state some way ? Also, the pmcr
|
|
* register setting, that can't be set once at boot ? We really want
|
|
* to move that away in order to implement a simple powersave
|
|
*/
|
|
cbe_enable_pause_zero();
|
|
|
|
while (1) {
|
|
if (!need_resched()) {
|
|
local_irq_disable();
|
|
while (!need_resched()) {
|
|
/* go into low thread priority */
|
|
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 = mfspr(SPRN_CTRLF);
|
|
ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
|
|
mtspr(SPRN_CTRLT, ctrl);
|
|
}
|
|
/* restore thread prio */
|
|
HMT_medium();
|
|
local_irq_enable();
|
|
}
|
|
|
|
/*
|
|
* turn runlatch on again before scheduling the
|
|
* process we just woke up
|
|
*/
|
|
ppc64_runlatch_on();
|
|
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|
|
|
|
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:
|
|
break;
|
|
#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)
|
|
{
|
|
if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
|
|
return;
|
|
|
|
ppc_md.idle_loop = cbe_idle;
|
|
ppc_md.system_reset_exception = cbe_system_reset_exception;
|
|
}
|