321 lines
6.8 KiB
C
321 lines
6.8 KiB
C
/*
|
|
* PowerNV setup code.
|
|
*
|
|
* Copyright 2011 IBM Corp.
|
|
*
|
|
* 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 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/cpu.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/init.h>
|
|
#include <linux/console.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/cpufreq.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/firmware.h>
|
|
#include <asm/xics.h>
|
|
#include <asm/opal.h>
|
|
#include <asm/kexec.h>
|
|
#include <asm/smp.h>
|
|
|
|
#include "powernv.h"
|
|
|
|
static void __init pnv_setup_arch(void)
|
|
{
|
|
set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
|
|
|
|
/* Initialize SMP */
|
|
pnv_smp_init();
|
|
|
|
/* Setup PCI */
|
|
pnv_pci_init();
|
|
|
|
/* Setup RTC and NVRAM callbacks */
|
|
if (firmware_has_feature(FW_FEATURE_OPAL))
|
|
opal_nvram_init();
|
|
|
|
/* Enable NAP mode */
|
|
powersave_nap = 1;
|
|
|
|
/* XXX PMCS */
|
|
}
|
|
|
|
static void __init pnv_init(void)
|
|
{
|
|
/*
|
|
* Initialize the LPC bus now so that legacy serial
|
|
* ports can be found on it
|
|
*/
|
|
opal_lpc_init();
|
|
|
|
#ifdef CONFIG_HVC_OPAL
|
|
if (firmware_has_feature(FW_FEATURE_OPAL))
|
|
hvc_opal_init_early();
|
|
else
|
|
#endif
|
|
add_preferred_console("hvc", 0, NULL);
|
|
}
|
|
|
|
static void __init pnv_init_IRQ(void)
|
|
{
|
|
xics_init();
|
|
|
|
WARN_ON(!ppc_md.get_irq);
|
|
}
|
|
|
|
static void pnv_show_cpuinfo(struct seq_file *m)
|
|
{
|
|
struct device_node *root;
|
|
const char *model = "";
|
|
|
|
root = of_find_node_by_path("/");
|
|
if (root)
|
|
model = of_get_property(root, "model", NULL);
|
|
seq_printf(m, "machine\t\t: PowerNV %s\n", model);
|
|
if (firmware_has_feature(FW_FEATURE_OPAL))
|
|
seq_printf(m, "firmware\t: OPAL\n");
|
|
else
|
|
seq_printf(m, "firmware\t: BML\n");
|
|
of_node_put(root);
|
|
}
|
|
|
|
static void pnv_prepare_going_down(void)
|
|
{
|
|
/*
|
|
* Disable all notifiers from OPAL, we can't
|
|
* service interrupts anymore anyway
|
|
*/
|
|
opal_event_shutdown();
|
|
|
|
/* Soft disable interrupts */
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* Return secondary CPUs to firwmare if a flash update
|
|
* is pending otherwise we will get all sort of error
|
|
* messages about CPU being stuck etc.. This will also
|
|
* have the side effect of hard disabling interrupts so
|
|
* past this point, the kernel is effectively dead.
|
|
*/
|
|
opal_flash_term_callback();
|
|
}
|
|
|
|
static void __noreturn pnv_restart(char *cmd)
|
|
{
|
|
long rc = OPAL_BUSY;
|
|
|
|
pnv_prepare_going_down();
|
|
|
|
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
|
|
rc = opal_cec_reboot();
|
|
if (rc == OPAL_BUSY_EVENT)
|
|
opal_poll_events(NULL);
|
|
else
|
|
mdelay(10);
|
|
}
|
|
for (;;)
|
|
opal_poll_events(NULL);
|
|
}
|
|
|
|
static void __noreturn pnv_power_off(void)
|
|
{
|
|
long rc = OPAL_BUSY;
|
|
|
|
pnv_prepare_going_down();
|
|
|
|
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
|
|
rc = opal_cec_power_down(0);
|
|
if (rc == OPAL_BUSY_EVENT)
|
|
opal_poll_events(NULL);
|
|
else
|
|
mdelay(10);
|
|
}
|
|
for (;;)
|
|
opal_poll_events(NULL);
|
|
}
|
|
|
|
static void __noreturn pnv_halt(void)
|
|
{
|
|
pnv_power_off();
|
|
}
|
|
|
|
static void pnv_progress(char *s, unsigned short hex)
|
|
{
|
|
}
|
|
|
|
static void pnv_shutdown(void)
|
|
{
|
|
/* Let the PCI code clear up IODA tables */
|
|
pnv_pci_shutdown();
|
|
|
|
/*
|
|
* Stop OPAL activity: Unregister all OPAL interrupts so they
|
|
* don't fire up while we kexec and make sure all potentially
|
|
* DMA'ing ops are complete (such as dump retrieval).
|
|
*/
|
|
opal_shutdown();
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
static void pnv_kexec_wait_secondaries_down(void)
|
|
{
|
|
int my_cpu, i, notified = -1;
|
|
|
|
my_cpu = get_cpu();
|
|
|
|
for_each_online_cpu(i) {
|
|
uint8_t status;
|
|
int64_t rc, timeout = 1000;
|
|
|
|
if (i == my_cpu)
|
|
continue;
|
|
|
|
for (;;) {
|
|
rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
|
|
&status);
|
|
if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
|
|
break;
|
|
barrier();
|
|
if (i != notified) {
|
|
printk(KERN_INFO "kexec: waiting for cpu %d "
|
|
"(physical %d) to enter OPAL\n",
|
|
i, paca[i].hw_cpu_id);
|
|
notified = i;
|
|
}
|
|
|
|
/*
|
|
* On crash secondaries might be unreachable or hung,
|
|
* so timeout if we've waited too long
|
|
* */
|
|
mdelay(1);
|
|
if (timeout-- == 0) {
|
|
printk(KERN_ERR "kexec: timed out waiting for "
|
|
"cpu %d (physical %d) to enter OPAL\n",
|
|
i, paca[i].hw_cpu_id);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
|
|
{
|
|
xics_kexec_teardown_cpu(secondary);
|
|
|
|
/* On OPAL, we return all CPUs to firmware */
|
|
|
|
if (!firmware_has_feature(FW_FEATURE_OPAL))
|
|
return;
|
|
|
|
if (secondary) {
|
|
/* Return secondary CPUs to firmware on OPAL v3 */
|
|
mb();
|
|
get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
|
|
mb();
|
|
|
|
/* Return the CPU to OPAL */
|
|
opal_return_cpu();
|
|
} else {
|
|
/* Primary waits for the secondaries to have reached OPAL */
|
|
pnv_kexec_wait_secondaries_down();
|
|
|
|
/*
|
|
* We might be running as little-endian - now that interrupts
|
|
* are disabled, reset the HILE bit to big-endian so we don't
|
|
* take interrupts in the wrong endian later
|
|
*/
|
|
opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
|
|
}
|
|
}
|
|
#endif /* CONFIG_KEXEC_CORE */
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
|
|
static unsigned long pnv_memory_block_size(void)
|
|
{
|
|
return 256UL * 1024 * 1024;
|
|
}
|
|
#endif
|
|
|
|
static void __init pnv_setup_machdep_opal(void)
|
|
{
|
|
ppc_md.get_boot_time = opal_get_boot_time;
|
|
ppc_md.restart = pnv_restart;
|
|
pm_power_off = pnv_power_off;
|
|
ppc_md.halt = pnv_halt;
|
|
ppc_md.machine_check_exception = opal_machine_check;
|
|
ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
|
|
ppc_md.hmi_exception_early = opal_hmi_exception_early;
|
|
ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
|
|
}
|
|
|
|
static int __init pnv_probe(void)
|
|
{
|
|
if (!of_machine_is_compatible("ibm,powernv"))
|
|
return 0;
|
|
|
|
if (firmware_has_feature(FW_FEATURE_OPAL))
|
|
pnv_setup_machdep_opal();
|
|
|
|
pr_debug("PowerNV detected !\n");
|
|
|
|
pnv_init();
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Returns the cpu frequency for 'cpu' in Hz. This is used by
|
|
* /proc/cpuinfo
|
|
*/
|
|
static unsigned long pnv_get_proc_freq(unsigned int cpu)
|
|
{
|
|
unsigned long ret_freq;
|
|
|
|
ret_freq = cpufreq_quick_get(cpu) * 1000ul;
|
|
|
|
/*
|
|
* If the backend cpufreq driver does not exist,
|
|
* then fallback to old way of reporting the clockrate.
|
|
*/
|
|
if (!ret_freq)
|
|
ret_freq = ppc_proc_freq;
|
|
return ret_freq;
|
|
}
|
|
|
|
define_machine(powernv) {
|
|
.name = "PowerNV",
|
|
.probe = pnv_probe,
|
|
.setup_arch = pnv_setup_arch,
|
|
.init_IRQ = pnv_init_IRQ,
|
|
.show_cpuinfo = pnv_show_cpuinfo,
|
|
.get_proc_freq = pnv_get_proc_freq,
|
|
.progress = pnv_progress,
|
|
.machine_shutdown = pnv_shutdown,
|
|
.power_save = NULL,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
.kexec_cpu_down = pnv_kexec_cpu_down,
|
|
#endif
|
|
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
|
|
.memory_block_size = pnv_memory_block_size,
|
|
#endif
|
|
};
|