blob: 258d1a692a91fc406cc598779ce5b1b1343d9311 [file] [log] [blame]
/* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/mfd/pmic8058.h>
#include <linux/mfd/pmic8901.h>
#include <linux/mfd/pm8xxx/misc.h>
#include <linux/qpnp/power-on.h>
#include <asm/mach-types.h>
#include <asm/cacheflush.h>
#include <mach/msm_iomap.h>
#include <mach/restart.h>
#include <mach/socinfo.h>
#include <mach/irqs.h>
#include <mach/scm.h>
#include "msm_watchdog.h"
#include "timer.h"
#include "wdog_debug.h"
#define WDT0_RST 0x38
#define WDT0_EN 0x40
#define WDT0_BARK_TIME 0x4C
#define WDT0_BITE_TIME 0x5C
#define PSHOLD_CTL_SU (MSM_TLMM_BASE + 0x820)
#define RESTART_REASON_ADDR 0x65C
#define DLOAD_MODE_ADDR 0x0
#define EMERGENCY_DLOAD_MODE_ADDR 0xFE0
#define EMERGENCY_DLOAD_MAGIC1 0x322A4F99
#define EMERGENCY_DLOAD_MAGIC2 0xC67E4350
#define EMERGENCY_DLOAD_MAGIC3 0x77777777
#define SCM_IO_DISABLE_PMIC_ARBITER 1
#ifdef CONFIG_MSM_RESTART_V2
#define use_restart_v2() 1
#else
#define use_restart_v2() 0
#endif
static int restart_mode;
void *restart_reason;
int pmic_reset_irq;
static void __iomem *msm_tmr0_base;
#ifdef CONFIG_MSM_DLOAD_MODE
static int in_panic;
static void *dload_mode_addr;
static bool dload_mode_enabled;
static void *emergency_dload_mode_addr;
/* Download mode master kill-switch */
static int dload_set(const char *val, struct kernel_param *kp);
static int download_mode = 0;
module_param_call(download_mode, dload_set, param_get_int,
&download_mode, 0644);
static int panic_prep_restart(struct notifier_block *this,
unsigned long event, void *ptr)
{
in_panic = 1;
return NOTIFY_DONE;
}
static struct notifier_block panic_blk = {
.notifier_call = panic_prep_restart,
};
static void set_dload_mode(int on)
{
if (dload_mode_addr) {
__raw_writel(on ? 0xE47B337D : 0, dload_mode_addr);
__raw_writel(on ? 0xCE14091A : 0,
dload_mode_addr + sizeof(unsigned int));
mb();
dload_mode_enabled = on;
}
}
static bool get_dload_mode(void)
{
return dload_mode_enabled;
}
static void enable_emergency_dload_mode(void)
{
if (emergency_dload_mode_addr) {
__raw_writel(EMERGENCY_DLOAD_MAGIC1,
emergency_dload_mode_addr);
__raw_writel(EMERGENCY_DLOAD_MAGIC2,
emergency_dload_mode_addr +
sizeof(unsigned int));
__raw_writel(EMERGENCY_DLOAD_MAGIC3,
emergency_dload_mode_addr +
(2 * sizeof(unsigned int)));
/* Need disable the pmic wdt, then the emergency dload mode
* will not auto reset. */
qpnp_pon_wd_config(0);
mb();
}
}
static int dload_set(const char *val, struct kernel_param *kp)
{
int ret;
int old_val = download_mode;
ret = param_set_int(val, kp);
if (ret)
return ret;
/* If download_mode is not zero or one, ignore. */
if (download_mode >> 1) {
download_mode = old_val;
return -EINVAL;
}
set_dload_mode(download_mode);
return 0;
}
#else
#define set_dload_mode(x) do {} while (0)
static void enable_emergency_dload_mode(void)
{
printk(KERN_ERR "dload mode is not enabled on target\n");
}
static bool get_dload_mode(void)
{
return false;
}
#endif
void msm_set_restart_mode(int mode)
{
restart_mode = mode;
}
EXPORT_SYMBOL(msm_set_restart_mode);
static bool scm_pmic_arbiter_disable_supported;
/*
* Force the SPMI PMIC arbiter to shutdown so that no more SPMI transactions
* are sent from the MSM to the PMIC. This is required in order to avoid an
* SPMI lockup on certain PMIC chips if PS_HOLD is lowered in the middle of
* an SPMI transaction.
*/
static void halt_spmi_pmic_arbiter(void)
{
if (scm_pmic_arbiter_disable_supported) {
pr_crit("Calling SCM to disable SPMI PMIC arbiter\n");
scm_call_atomic1(SCM_SVC_PWR, SCM_IO_DISABLE_PMIC_ARBITER, 0);
}
}
static void __msm_power_off(int lower_pshold)
{
printk(KERN_CRIT "Powering off the SoC\n");
#ifdef CONFIG_MSM_DLOAD_MODE
set_dload_mode(0);
#endif
pm8xxx_reset_pwr_off(0);
qpnp_pon_system_pwr_off(PON_POWER_OFF_SHUTDOWN);
if (lower_pshold) {
if (!use_restart_v2()) {
__raw_writel(0, PSHOLD_CTL_SU);
} else {
halt_spmi_pmic_arbiter();
__raw_writel(0, MSM_MPM2_PSHOLD_BASE);
}
mdelay(10000);
printk(KERN_ERR "Powering off has failed\n");
}
return;
}
static void msm_power_off(void)
{
/* MSM initiated power off, lower ps_hold */
__msm_power_off(1);
}
static void cpu_power_off(void *data)
{
int rc;
pr_err("PMIC Initiated shutdown %s cpu=%d\n", __func__,
smp_processor_id());
if (smp_processor_id() == 0) {
/*
* PMIC initiated power off, do not lower ps_hold, pmic will
* shut msm down
*/
__msm_power_off(0);
pet_watchdog();
pr_err("Calling scm to disable arbiter\n");
/* call secure manager to disable arbiter and never return */
rc = scm_call_atomic1(SCM_SVC_PWR,
SCM_IO_DISABLE_PMIC_ARBITER, 1);
pr_err("SCM returned even when asked to busy loop rc=%d\n", rc);
pr_err("waiting on pmic to shut msm down\n");
}
preempt_disable();
while (1)
;
}
static irqreturn_t resout_irq_handler(int irq, void *dev_id)
{
pr_warn("%s PMIC Initiated shutdown\n", __func__);
oops_in_progress = 1;
smp_call_function_many(cpu_online_mask, cpu_power_off, NULL, 0);
if (smp_processor_id() == 0)
cpu_power_off(NULL);
preempt_disable();
while (1)
;
return IRQ_HANDLED;
}
static void msm_restart_prepare(const char *cmd)
{
#ifdef CONFIG_MSM_DLOAD_MODE
/* This looks like a normal reboot at this point. */
set_dload_mode(0);
/* Write download mode flags if we're panic'ing */
set_dload_mode(in_panic);
/* Write download mode flags if restart_mode says so */
if (restart_mode == RESTART_DLOAD)
set_dload_mode(1);
/* Kill download mode if master-kill switch is set */
if (!download_mode)
set_dload_mode(0);
#endif
pm8xxx_reset_pwr_off(1);
/* Hard reset the PMIC unless memory contents must be maintained. */
if (get_dload_mode() || (cmd != NULL && cmd[0] != '\0'))
qpnp_pon_system_pwr_off(PON_POWER_OFF_WARM_RESET);
else
qpnp_pon_system_pwr_off(PON_POWER_OFF_HARD_RESET);
if (cmd != NULL) {
if (!strncmp(cmd, "bootloader", 10)) {
__raw_writel(0x77665500, restart_reason);
} else if (!strncmp(cmd, "recovery", 8)) {
__raw_writel(0x77665502, restart_reason);
} else if (!strcmp(cmd, "rtc")) {
__raw_writel(0x77665503, restart_reason);
} else if (!strncmp(cmd, "oem-", 4)) {
unsigned long code;
code = simple_strtoul(cmd + 4, NULL, 16) & 0xff;
__raw_writel(0x6f656d00 | code, restart_reason);
} else if (!strncmp(cmd, "edl", 3)) {
enable_emergency_dload_mode();
} else {
__raw_writel(0x77665501, restart_reason);
}
}
flush_cache_all();
outer_flush_all();
}
void msm_restart(char mode, const char *cmd)
{
printk(KERN_NOTICE "Going down for restart now\n");
msm_restart_prepare(cmd);
if (!use_restart_v2()) {
__raw_writel(0, msm_tmr0_base + WDT0_EN);
if (!(machine_is_msm8x60_fusion() ||
machine_is_msm8x60_fusn_ffa())) {
mb();
/* Actually reset the chip */
__raw_writel(0, PSHOLD_CTL_SU);
mdelay(5000);
pr_notice("PS_HOLD didn't work, falling back to watchdog\n");
}
__raw_writel(1, msm_tmr0_base + WDT0_RST);
__raw_writel(5*0x31F3, msm_tmr0_base + WDT0_BARK_TIME);
__raw_writel(0x31F3, msm_tmr0_base + WDT0_BITE_TIME);
__raw_writel(1, msm_tmr0_base + WDT0_EN);
} else {
/* Needed to bypass debug image on some chips */
msm_disable_wdog_debug();
halt_spmi_pmic_arbiter();
__raw_writel(0, MSM_MPM2_PSHOLD_BASE);
}
mdelay(10000);
printk(KERN_ERR "Restarting has failed\n");
}
static int __init msm_pmic_restart_init(void)
{
int rc;
if (use_restart_v2())
return 0;
if (pmic_reset_irq != 0) {
rc = request_any_context_irq(pmic_reset_irq,
resout_irq_handler, IRQF_TRIGGER_HIGH,
"restart_from_pmic", NULL);
if (rc < 0)
pr_err("pmic restart irq fail rc = %d\n", rc);
} else {
pr_warn("no pmic restart interrupt specified\n");
}
return 0;
}
late_initcall(msm_pmic_restart_init);
static int __init msm_restart_init(void)
{
#ifdef CONFIG_MSM_DLOAD_MODE
atomic_notifier_chain_register(&panic_notifier_list, &panic_blk);
dload_mode_addr = MSM_IMEM_BASE + DLOAD_MODE_ADDR;
emergency_dload_mode_addr = MSM_IMEM_BASE +
EMERGENCY_DLOAD_MODE_ADDR;
set_dload_mode(download_mode);
#endif
msm_tmr0_base = msm_timer_get_timer0_base();
restart_reason = MSM_IMEM_BASE + RESTART_REASON_ADDR;
pm_power_off = msm_power_off;
if (scm_is_call_available(SCM_SVC_PWR, SCM_IO_DISABLE_PMIC_ARBITER) > 0)
scm_pmic_arbiter_disable_supported = true;
return 0;
}
early_initcall(msm_restart_init);