158 lines
3.8 KiB
C
158 lines
3.8 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 <asm/cell-regs.h>
|
|
|
|
#include "pervasive.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;
|
|
}
|