445 lines
11 KiB
C
445 lines
11 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/* Copyright (c) 2020, 2021 The Linux Foundation. All rights reserved.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/reboot.h>
|
||
|
|
#include <linux/pm.h>
|
||
|
|
#include <linux/panic_notifier.h>
|
||
|
|
#include <linux/qcom_scm.h>
|
||
|
|
#include <soc/qcom/minidump.h>
|
||
|
|
#include <linux/syscore_ops.h>
|
||
|
|
|
||
|
|
static char *sys_restart_mode = "NULL";
|
||
|
|
module_param(sys_restart_mode, charp, 0644);
|
||
|
|
|
||
|
|
enum qcom_download_dest {
|
||
|
|
QCOM_DOWNLOAD_DEST_UNKNOWN = -1,
|
||
|
|
QCOM_DOWNLOAD_DEST_QPST = 0,
|
||
|
|
QCOM_DOWNLOAD_DEST_EMMC = 2,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct qcom_dload {
|
||
|
|
struct notifier_block panic_nb;
|
||
|
|
struct notifier_block reboot_nb;
|
||
|
|
struct kobject kobj;
|
||
|
|
|
||
|
|
bool in_panic;
|
||
|
|
void __iomem *dload_dest_addr;
|
||
|
|
};
|
||
|
|
|
||
|
|
#define to_qcom_dload(o) container_of(o, struct qcom_dload, kobj)
|
||
|
|
|
||
|
|
#define QCOM_DOWNLOAD_BOTHDUMP (QCOM_DOWNLOAD_FULLDUMP | QCOM_DOWNLOAD_MINIDUMP)
|
||
|
|
|
||
|
|
#define DUMP_MODE_NAME_LEN 8
|
||
|
|
|
||
|
|
static char dump_mode_name[DUMP_MODE_NAME_LEN];
|
||
|
|
|
||
|
|
static bool enable_dump =
|
||
|
|
IS_ENABLED(CONFIG_POWER_RESET_QCOM_DOWNLOAD_MODE_DEFAULT);
|
||
|
|
static enum qcom_download_mode current_download_mode = QCOM_DOWNLOAD_NODUMP;
|
||
|
|
static enum qcom_download_mode dump_mode = QCOM_DOWNLOAD_BOTHDUMP;
|
||
|
|
|
||
|
|
static int set_download_mode(enum qcom_download_mode mode)
|
||
|
|
{
|
||
|
|
if ((mode & QCOM_DOWNLOAD_MINIDUMP) && !msm_minidump_enabled()) {
|
||
|
|
mode &= ~QCOM_DOWNLOAD_MINIDUMP;
|
||
|
|
pr_warn("Minidump not enabled.\n");
|
||
|
|
if (!mode)
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
current_download_mode = mode;
|
||
|
|
qcom_scm_set_download_mode(mode, 0);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int set_dump_mode(enum qcom_download_mode mode)
|
||
|
|
{
|
||
|
|
int ret = 0, temp;
|
||
|
|
|
||
|
|
if (enable_dump) {
|
||
|
|
ret = set_download_mode(mode);
|
||
|
|
if (likely(!ret))
|
||
|
|
dump_mode = qcom_scm_get_download_mode(&temp, 0) ? dump_mode : temp;
|
||
|
|
} else
|
||
|
|
dump_mode = mode;
|
||
|
|
|
||
|
|
if (dump_mode != mode)
|
||
|
|
pr_err("Requested dload mode is not set\n");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int get_dump_mode(void)
|
||
|
|
{
|
||
|
|
return dump_mode;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(get_dump_mode);
|
||
|
|
|
||
|
|
static void msm_enable_dump_mode(bool enable)
|
||
|
|
{
|
||
|
|
if (enable)
|
||
|
|
set_download_mode(dump_mode);
|
||
|
|
else
|
||
|
|
set_download_mode(QCOM_DOWNLOAD_NODUMP);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void set_download_dest(struct qcom_dload *poweroff,
|
||
|
|
enum qcom_download_dest dest)
|
||
|
|
{
|
||
|
|
if (poweroff->dload_dest_addr)
|
||
|
|
__raw_writel(dest, poweroff->dload_dest_addr);
|
||
|
|
}
|
||
|
|
static enum qcom_download_dest get_download_dest(struct qcom_dload *poweroff)
|
||
|
|
{
|
||
|
|
if (poweroff->dload_dest_addr)
|
||
|
|
return __raw_readl(poweroff->dload_dest_addr);
|
||
|
|
else
|
||
|
|
return QCOM_DOWNLOAD_DEST_UNKNOWN;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int param_set_download_mode(const char *val,
|
||
|
|
const struct kernel_param *kp)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
/* update enable_dump according to user input */
|
||
|
|
ret = param_set_bool(val, kp);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
msm_enable_dump_mode(enable_dump);
|
||
|
|
if (!enable_dump)
|
||
|
|
qcom_scm_disable_sdi();
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
module_param_call(download_mode, param_set_download_mode, param_get_int,
|
||
|
|
&enable_dump, 0644);
|
||
|
|
|
||
|
|
module_param_string(name, dump_mode_name, DUMP_MODE_NAME_LEN, 0644);
|
||
|
|
|
||
|
|
/* interface for exporting attributes */
|
||
|
|
struct reset_attribute {
|
||
|
|
struct attribute attr;
|
||
|
|
ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
|
||
|
|
char *buf);
|
||
|
|
ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
|
||
|
|
const char *buf, size_t count);
|
||
|
|
};
|
||
|
|
#define to_reset_attr(_attr) \
|
||
|
|
container_of(_attr, struct reset_attribute, attr)
|
||
|
|
|
||
|
|
static ssize_t attr_show(struct kobject *kobj, struct attribute *attr,
|
||
|
|
char *buf)
|
||
|
|
{
|
||
|
|
struct reset_attribute *reset_attr = to_reset_attr(attr);
|
||
|
|
ssize_t ret = -EIO;
|
||
|
|
|
||
|
|
if (reset_attr->show)
|
||
|
|
ret = reset_attr->show(kobj, attr, buf);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t attr_store(struct kobject *kobj, struct attribute *attr,
|
||
|
|
const char *buf, size_t count)
|
||
|
|
{
|
||
|
|
struct reset_attribute *reset_attr = to_reset_attr(attr);
|
||
|
|
ssize_t ret = -EIO;
|
||
|
|
|
||
|
|
if (reset_attr->store)
|
||
|
|
ret = reset_attr->store(kobj, attr, buf, count);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct sysfs_ops reset_sysfs_ops = {
|
||
|
|
.show = attr_show,
|
||
|
|
.store = attr_store,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct kobj_type qcom_dload_kobj_type = {
|
||
|
|
.sysfs_ops = &reset_sysfs_ops,
|
||
|
|
};
|
||
|
|
|
||
|
|
static ssize_t emmc_dload_show(struct kobject *kobj,
|
||
|
|
struct attribute *this,
|
||
|
|
char *buf)
|
||
|
|
{
|
||
|
|
struct qcom_dload *poweroff = to_qcom_dload(kobj);
|
||
|
|
|
||
|
|
if (!poweroff->dload_dest_addr)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n",
|
||
|
|
get_download_dest(poweroff) == QCOM_DOWNLOAD_DEST_EMMC);
|
||
|
|
}
|
||
|
|
static ssize_t emmc_dload_store(struct kobject *kobj,
|
||
|
|
struct attribute *this,
|
||
|
|
const char *buf, size_t count)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
bool enabled;
|
||
|
|
struct qcom_dload *poweroff = to_qcom_dload(kobj);
|
||
|
|
|
||
|
|
if (!poweroff->dload_dest_addr)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
ret = kstrtobool(buf, &enabled);
|
||
|
|
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (enabled)
|
||
|
|
set_download_dest(poweroff, QCOM_DOWNLOAD_DEST_EMMC);
|
||
|
|
else
|
||
|
|
set_download_dest(poweroff, QCOM_DOWNLOAD_DEST_QPST);
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
static struct reset_attribute attr_emmc_dload = __ATTR_RW(emmc_dload);
|
||
|
|
|
||
|
|
static ssize_t dload_mode_show(struct kobject *kobj,
|
||
|
|
struct attribute *this,
|
||
|
|
char *buf)
|
||
|
|
{
|
||
|
|
const char *mode;
|
||
|
|
|
||
|
|
switch ((unsigned int)dump_mode) {
|
||
|
|
case QCOM_DOWNLOAD_FULLDUMP:
|
||
|
|
mode = "full";
|
||
|
|
break;
|
||
|
|
case QCOM_DOWNLOAD_MINIDUMP:
|
||
|
|
mode = "mini";
|
||
|
|
break;
|
||
|
|
case QCOM_DOWNLOAD_BOTHDUMP:
|
||
|
|
mode = "both";
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
mode = "unknown";
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return scnprintf(buf, PAGE_SIZE, "DLOAD dump type: %s\n", mode);
|
||
|
|
}
|
||
|
|
static ssize_t dload_mode_store(struct kobject *kobj,
|
||
|
|
struct attribute *this,
|
||
|
|
const char *buf, size_t count)
|
||
|
|
{
|
||
|
|
enum qcom_download_mode mode;
|
||
|
|
|
||
|
|
if (sysfs_streq(buf, "full"))
|
||
|
|
mode = QCOM_DOWNLOAD_FULLDUMP;
|
||
|
|
else if (sysfs_streq(buf, "mini"))
|
||
|
|
mode = QCOM_DOWNLOAD_MINIDUMP;
|
||
|
|
else if (sysfs_streq(buf, "both"))
|
||
|
|
mode = QCOM_DOWNLOAD_BOTHDUMP;
|
||
|
|
else {
|
||
|
|
pr_err("Invalid dump mode request...\n");
|
||
|
|
pr_err("Supported dumps: 'full', 'mini', or 'both'\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return set_dump_mode(mode) ? : count;
|
||
|
|
}
|
||
|
|
static struct reset_attribute attr_dload_mode = __ATTR_RW(dload_mode);
|
||
|
|
|
||
|
|
static struct attribute *qcom_dload_attrs[] = {
|
||
|
|
&attr_emmc_dload.attr,
|
||
|
|
&attr_dload_mode.attr,
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
static struct attribute_group qcom_dload_attr_group = {
|
||
|
|
.attrs = qcom_dload_attrs,
|
||
|
|
};
|
||
|
|
|
||
|
|
static void qcom_dload_syscore_resume(void)
|
||
|
|
{
|
||
|
|
msm_enable_dump_mode(enable_dump);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct syscore_ops qcom_dload_syscore_ops = {
|
||
|
|
.resume = qcom_dload_syscore_resume,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int qcom_dload_panic(struct notifier_block *this, unsigned long event,
|
||
|
|
void *ptr)
|
||
|
|
{
|
||
|
|
struct qcom_dload *poweroff = container_of(this, struct qcom_dload,
|
||
|
|
panic_nb);
|
||
|
|
poweroff->in_panic = true;
|
||
|
|
if (enable_dump)
|
||
|
|
msm_enable_dump_mode(true);
|
||
|
|
return NOTIFY_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int qcom_dload_reboot(struct notifier_block *this, unsigned long event,
|
||
|
|
void *ptr)
|
||
|
|
{
|
||
|
|
char *cmd = ptr;
|
||
|
|
struct qcom_dload *poweroff = container_of(this, struct qcom_dload,
|
||
|
|
reboot_nb);
|
||
|
|
|
||
|
|
pr_info("%s: sys_restart_mode [%s]\n", __func__, sys_restart_mode);
|
||
|
|
if (!strcmp(sys_restart_mode, "panic")) {
|
||
|
|
/* Trigger a real panic on debug setting */
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
if (!strcmp(sys_restart_mode, "recovery_panic")) {
|
||
|
|
if (!strcmp(cmd, "recovery")) {
|
||
|
|
/* Trigger a real panic on debug setting */
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Clean shutdown, disable dump mode to allow normal restart */
|
||
|
|
if (!poweroff->in_panic)
|
||
|
|
set_download_mode(QCOM_DOWNLOAD_NODUMP);
|
||
|
|
|
||
|
|
if (cmd) {
|
||
|
|
if (!strcmp(cmd, "edl"))
|
||
|
|
set_download_mode(QCOM_DOWNLOAD_EDL);
|
||
|
|
else if (!strcmp(cmd, "qcom_dload"))
|
||
|
|
msm_enable_dump_mode(true);
|
||
|
|
else if (!strcmp(cmd, "rtc"))
|
||
|
|
qcom_scm_custom_reset_type = QCOM_SCM_RST_SHUTDOWN_TO_RTC_MODE;
|
||
|
|
else if (!strcmp(cmd, "twm"))
|
||
|
|
qcom_scm_custom_reset_type = QCOM_SCM_RST_SHUTDOWN_TO_TWM_MODE;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (current_download_mode != QCOM_DOWNLOAD_NODUMP)
|
||
|
|
reboot_mode = REBOOT_WARM;
|
||
|
|
|
||
|
|
return NOTIFY_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __iomem *map_prop_mem(const char *propname)
|
||
|
|
{
|
||
|
|
struct device_node *np = of_find_compatible_node(NULL, NULL, propname);
|
||
|
|
void __iomem *addr;
|
||
|
|
|
||
|
|
if (!np) {
|
||
|
|
pr_err("Unable to find DT property: %s\n", propname);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
addr = of_iomap(np, 0);
|
||
|
|
if (!addr)
|
||
|
|
pr_err("Unable to map memory for DT property: %s\n", propname);
|
||
|
|
return addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int qcom_dload_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct qcom_dload *poweroff;
|
||
|
|
int ret, temp;
|
||
|
|
|
||
|
|
poweroff = devm_kzalloc(&pdev->dev, sizeof(*poweroff), GFP_KERNEL);
|
||
|
|
if (!poweroff)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ret = kobject_init_and_add(&poweroff->kobj, &qcom_dload_kobj_type,
|
||
|
|
kernel_kobj, "dload");
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s: Error in creation kobject_add\n", __func__);
|
||
|
|
kobject_put(&poweroff->kobj);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = sysfs_create_group(&poweroff->kobj, &qcom_dload_attr_group);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s: Error in creation sysfs_create_group\n", __func__);
|
||
|
|
kobject_del(&poweroff->kobj);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
poweroff->dload_dest_addr = map_prop_mem("qcom,msm-imem-dload-type");
|
||
|
|
|
||
|
|
if (!strncmp("full", dump_mode_name, DUMP_MODE_NAME_LEN))
|
||
|
|
dump_mode = QCOM_DOWNLOAD_FULLDUMP;
|
||
|
|
else if (!strncmp("mini", dump_mode_name, DUMP_MODE_NAME_LEN))
|
||
|
|
dump_mode = QCOM_DOWNLOAD_MINIDUMP;
|
||
|
|
else if (!strncmp("both", dump_mode_name, DUMP_MODE_NAME_LEN))
|
||
|
|
dump_mode = QCOM_DOWNLOAD_BOTHDUMP;
|
||
|
|
else
|
||
|
|
dump_mode = QCOM_DOWNLOAD_NODUMP;
|
||
|
|
|
||
|
|
msm_enable_dump_mode(enable_dump);
|
||
|
|
dump_mode = qcom_scm_get_download_mode(&temp, 0) ? dump_mode : temp;
|
||
|
|
pr_info("%s: Current dump mode: 0x%x\n", __func__, dump_mode);
|
||
|
|
|
||
|
|
if (!enable_dump)
|
||
|
|
qcom_scm_disable_sdi();
|
||
|
|
|
||
|
|
poweroff->panic_nb.notifier_call = qcom_dload_panic;
|
||
|
|
poweroff->panic_nb.priority = INT_MAX;
|
||
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
||
|
|
&poweroff->panic_nb);
|
||
|
|
|
||
|
|
poweroff->reboot_nb.notifier_call = qcom_dload_reboot;
|
||
|
|
poweroff->reboot_nb.priority = 255;
|
||
|
|
register_reboot_notifier(&poweroff->reboot_nb);
|
||
|
|
register_syscore_ops(&qcom_dload_syscore_ops);
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, poweroff);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int qcom_dload_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct qcom_dload *poweroff = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
||
|
|
&poweroff->panic_nb);
|
||
|
|
unregister_reboot_notifier(&poweroff->reboot_nb);
|
||
|
|
|
||
|
|
if (poweroff->dload_dest_addr)
|
||
|
|
iounmap(poweroff->dload_dest_addr);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id of_qcom_dload_match[] = {
|
||
|
|
{ .compatible = "qcom,dload-mode", },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, of_qcom_dload_match);
|
||
|
|
|
||
|
|
static struct platform_driver qcom_dload_driver = {
|
||
|
|
.probe = qcom_dload_probe,
|
||
|
|
.remove = qcom_dload_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "qcom-dload-mode",
|
||
|
|
.of_match_table = of_match_ptr(of_qcom_dload_match),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init qcom_dload_driver_init(void)
|
||
|
|
{
|
||
|
|
return platform_driver_register(&qcom_dload_driver);
|
||
|
|
}
|
||
|
|
#if IS_MODULE(CONFIG_POWER_RESET_QCOM_DOWNLOAD_MODE)
|
||
|
|
module_init(qcom_dload_driver_init);
|
||
|
|
#else
|
||
|
|
fs_initcall(qcom_dload_driver_init);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static void __exit qcom_dload_driver_exit(void)
|
||
|
|
{
|
||
|
|
return platform_driver_unregister(&qcom_dload_driver);
|
||
|
|
}
|
||
|
|
module_exit(qcom_dload_driver_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("MSM Download Mode Driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|