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/*
* 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 int sysreset_hack;
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",
__FUNCTION__);
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)
{
int cpu;
struct cbe_pmd_regs __iomem *pmd;
switch (regs->msr & SRR1_WAKEMASK) {
case SRR1_WAKEEE:
do_IRQ(regs);
break;
case SRR1_WAKEDEC:
timer_interrupt(regs);
break;
case SRR1_WAKEMT:
/*
* The BMC can inject user triggered system reset exceptions,
* but cannot set the system reset reason in srr1,
* so check an extra register here.
*/
if (sysreset_hack && (cpu = smp_processor_id()) == 0) {
pmd = cbe_get_cpu_pmd_regs(cpu);
if (in_be64(&pmd->ras_esc_0) & 0xffff) {
out_be64(&pmd->ras_esc_0, 0);
return 0;
}
}
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)
{
int cpu;
if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
return;
sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
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(®s->pmcr, in_be64(®s->pmcr) |
CBE_PMD_PAUSE_ZERO_CONTROL);
/* Enable JTAG system-reset hack */
if (sysreset_hack)
out_be32(®s->fir_mode_reg,
in_be32(®s->fir_mode_reg) |
CBE_PMD_FIR_MODE_M8);
}
ppc_md.power_save = cbe_power_save;
ppc_md.system_reset_exception = cbe_system_reset_exception;
}
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