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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/config.h>
#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"
static DEFINE_SPINLOCK(cbe_pervasive_lock);
struct cbe_pervasive {
struct pmd_regs __iomem *regs;
unsigned int thread;
};
/* can't use per_cpu from setup_arch */
static struct cbe_pervasive cbe_pervasive[NR_CPUS];
static void __init cbe_enable_pause_zero(void)
{
unsigned long thread_switch_control;
unsigned long temp_register;
struct cbe_pervasive *p;
int thread;
spin_lock_irq(&cbe_pervasive_lock);
p = &cbe_pervasive[smp_processor_id()];
if (!cbe_pervasive->regs)
goto out;
pr_debug("Power Management: CPU %d\n", smp_processor_id());
/* Enable Pause(0) control bit */
temp_register = in_be64(&p->regs->pm_control);
out_be64(&p->regs->pm_control,
temp_register|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;
thread = 0;
break;
case CTRL_CT1:
thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
thread = 1;
break;
default:
printk(KERN_WARNING "%s: unknown configuration\n",
__FUNCTION__);
thread = -1;
break;
}
if (p->thread != thread)
printk(KERN_WARNING "%s: device tree inconsistant, "
"cpu %i: %d/%d\n", __FUNCTION__,
smp_processor_id(),
p->thread, thread);
mtspr(SPRN_TSC_CELL, thread_switch_control);
out:
spin_unlock_irq(&cbe_pervasive_lock);
}
static void cbe_idle(void)
{
unsigned long ctrl;
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:
/* no action required */
break;
default:
/* do system reset */
return 0;
}
/* everything handled */
return 1;
}
static int __init cbe_find_pmd_mmio(int cpu, struct cbe_pervasive *p)
{
struct device_node *node;
unsigned int *int_servers;
char *addr;
unsigned long real_address;
unsigned int size;
struct pmd_regs __iomem *pmd_mmio_area;
int hardid, thread;
int proplen;
pmd_mmio_area = NULL;
hardid = get_hard_smp_processor_id(cpu);
for (node = NULL; (node = of_find_node_by_type(node, "cpu"));) {
int_servers = (void *) get_property(node,
"ibm,ppc-interrupt-server#s", &proplen);
if (!int_servers) {
printk(KERN_WARNING "%s misses "
"ibm,ppc-interrupt-server#s property",
node->full_name);
continue;
}
for (thread = 0; thread < proplen / sizeof (int); thread++) {
if (hardid == int_servers[thread]) {
addr = get_property(node, "pervasive", NULL);
goto found;
}
}
}
printk(KERN_WARNING "%s: CPU %d not found\n", __FUNCTION__, cpu);
return -EINVAL;
found:
real_address = *(unsigned long*) addr;
addr += sizeof (unsigned long);
size = *(unsigned int*) addr;
pr_debug("pervasive area for CPU %d at %lx, size %x\n",
cpu, real_address, size);
p->regs = __ioremap(real_address, size, _PAGE_NO_CACHE);
p->thread = thread;
return 0;
}
void __init cell_pervasive_init(void)
{
struct cbe_pervasive *p;
int cpu;
int ret;
if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
return;
for_each_cpu(cpu) {
p = &cbe_pervasive[cpu];
ret = cbe_find_pmd_mmio(cpu, p);
if (ret)
return;
}
ppc_md.idle_loop = cbe_idle;
ppc_md.system_reset_exception = cbe_system_reset_exception;
}
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