blob: 7474215702572ddf5edb8c57a8b63de87456a7e6 [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/platform_device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/debugfs.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <linux/mfd/pm8xxx/misc.h>
#include <mach/mdm.h>
#include <mach/restart.h>
#include <mach/subsystem_notif.h>
#include <mach/subsystem_restart.h>
#include <linux/msm_charm.h>
#include "msm_watchdog.h"
#include "devices.h"
#define CHARM_MODEM_TIMEOUT 6000
#define CHARM_HOLD_TIME 4000
#define CHARM_MODEM_DELTA 100
static void (*power_on_charm)(void);
static void (*power_down_charm)(void);
static int charm_debug_on;
static int charm_status_irq;
static int charm_errfatal_irq;
static int charm_ready;
static enum charm_boot_type boot_type = CHARM_NORMAL_BOOT;
static int charm_boot_status;
static int charm_ram_dump_status;
static struct workqueue_struct *charm_queue;
#define CHARM_DBG(...) do { if (charm_debug_on) \
pr_info(__VA_ARGS__); \
} while (0);
DECLARE_COMPLETION(charm_needs_reload);
DECLARE_COMPLETION(charm_boot);
DECLARE_COMPLETION(charm_ram_dumps);
static void charm_disable_irqs(void)
{
disable_irq_nosync(charm_errfatal_irq);
disable_irq_nosync(charm_status_irq);
}
static int charm_subsys_shutdown(const struct subsys_desc *crashed_subsys)
{
charm_ready = 0;
power_down_charm();
return 0;
}
static int charm_subsys_powerup(const struct subsys_desc *crashed_subsys)
{
power_on_charm();
boot_type = CHARM_NORMAL_BOOT;
complete(&charm_needs_reload);
wait_for_completion(&charm_boot);
pr_info("%s: charm modem has been restarted\n", __func__);
INIT_COMPLETION(charm_boot);
return charm_boot_status;
}
static int charm_subsys_ramdumps(int want_dumps,
const struct subsys_desc *crashed_subsys)
{
charm_ram_dump_status = 0;
if (want_dumps) {
boot_type = CHARM_RAM_DUMPS;
complete(&charm_needs_reload);
wait_for_completion(&charm_ram_dumps);
INIT_COMPLETION(charm_ram_dumps);
power_down_charm();
}
return charm_ram_dump_status;
}
static struct subsys_device *charm_subsys;
static struct subsys_desc charm_subsystem = {
.shutdown = charm_subsys_shutdown,
.ramdump = charm_subsys_ramdumps,
.powerup = charm_subsys_powerup,
.name = "external_modem",
};
static int charm_panic_prep(struct notifier_block *this,
unsigned long event, void *ptr)
{
int i;
CHARM_DBG("%s: setting AP2MDM_ERRFATAL high for a non graceful reset\n",
__func__);
if (subsys_get_restart_level(charm_subsys) == RESET_SOC)
pm8xxx_stay_on();
charm_disable_irqs();
gpio_set_value(AP2MDM_ERRFATAL, 1);
gpio_set_value(AP2MDM_WAKEUP, 1);
for (i = CHARM_MODEM_TIMEOUT; i > 0; i -= CHARM_MODEM_DELTA) {
pet_watchdog();
mdelay(CHARM_MODEM_DELTA);
if (gpio_get_value(MDM2AP_STATUS) == 0)
break;
}
if (i <= 0)
pr_err("%s: MDM2AP_STATUS never went low\n", __func__);
return NOTIFY_DONE;
}
static struct notifier_block charm_panic_blk = {
.notifier_call = charm_panic_prep,
};
static int first_boot = 1;
static long charm_modem_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
int status, ret = 0;
if (_IOC_TYPE(cmd) != CHARM_CODE) {
pr_err("%s: invalid ioctl code\n", __func__);
return -EINVAL;
}
CHARM_DBG("%s: Entering ioctl cmd = %d\n", __func__, _IOC_NR(cmd));
switch (cmd) {
case WAKE_CHARM:
CHARM_DBG("%s: Powering on\n", __func__);
power_on_charm();
break;
case CHECK_FOR_BOOT:
if (gpio_get_value(MDM2AP_STATUS) == 0)
put_user(1, (unsigned long __user *) arg);
else
put_user(0, (unsigned long __user *) arg);
break;
case NORMAL_BOOT_DONE:
CHARM_DBG("%s: check if charm is booted up\n", __func__);
get_user(status, (unsigned long __user *) arg);
if (status)
charm_boot_status = -EIO;
else
charm_boot_status = 0;
charm_ready = 1;
gpio_set_value(AP2MDM_KPDPWR_N, 0);
if (!first_boot)
complete(&charm_boot);
else
first_boot = 0;
break;
case RAM_DUMP_DONE:
CHARM_DBG("%s: charm done collecting RAM dumps\n", __func__);
get_user(status, (unsigned long __user *) arg);
if (status)
charm_ram_dump_status = -EIO;
else
charm_ram_dump_status = 0;
complete(&charm_ram_dumps);
break;
case WAIT_FOR_RESTART:
CHARM_DBG("%s: wait for charm to need images reloaded\n",
__func__);
ret = wait_for_completion_interruptible(&charm_needs_reload);
if (!ret)
put_user(boot_type, (unsigned long __user *) arg);
INIT_COMPLETION(charm_needs_reload);
break;
default:
pr_err("%s: invalid ioctl cmd = %d\n", __func__, _IOC_NR(cmd));
ret = -EINVAL;
break;
}
return ret;
}
static int charm_modem_open(struct inode *inode, struct file *file)
{
return 0;
}
static const struct file_operations charm_modem_fops = {
.owner = THIS_MODULE,
.open = charm_modem_open,
.unlocked_ioctl = charm_modem_ioctl,
};
struct miscdevice charm_modem_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "mdm",
.fops = &charm_modem_fops
};
static void charm_status_fn(struct work_struct *work)
{
pr_info("Reseting the charm because status changed\n");
subsystem_restart_dev(charm_subsys);
}
static DECLARE_WORK(charm_status_work, charm_status_fn);
static void charm_fatal_fn(struct work_struct *work)
{
pr_info("Reseting the charm due to an errfatal\n");
if (subsys_get_restart_level(charm_subsys) == RESET_SOC)
pm8xxx_stay_on();
subsystem_restart_dev(charm_subsys);
}
static DECLARE_WORK(charm_fatal_work, charm_fatal_fn);
static irqreturn_t charm_errfatal(int irq, void *dev_id)
{
CHARM_DBG("%s: charm got errfatal interrupt\n", __func__);
if (charm_ready && (gpio_get_value(MDM2AP_STATUS) == 1)) {
CHARM_DBG("%s: scheduling work now\n", __func__);
queue_work(charm_queue, &charm_fatal_work);
}
return IRQ_HANDLED;
}
static irqreturn_t charm_status_change(int irq, void *dev_id)
{
CHARM_DBG("%s: charm sent status change interrupt\n", __func__);
if ((gpio_get_value(MDM2AP_STATUS) == 0) && charm_ready) {
CHARM_DBG("%s: scheduling work now\n", __func__);
queue_work(charm_queue, &charm_status_work);
} else if (gpio_get_value(MDM2AP_STATUS) == 1) {
CHARM_DBG("%s: charm is now ready\n", __func__);
}
return IRQ_HANDLED;
}
static int charm_debug_on_set(void *data, u64 val)
{
charm_debug_on = val;
return 0;
}
static int charm_debug_on_get(void *data, u64 *val)
{
*val = charm_debug_on;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(charm_debug_on_fops,
charm_debug_on_get,
charm_debug_on_set, "%llu\n");
static int charm_debugfs_init(void)
{
struct dentry *dent;
dent = debugfs_create_dir("charm_dbg", 0);
if (IS_ERR(dent))
return PTR_ERR(dent);
debugfs_create_file("debug_on", 0644, dent, NULL,
&charm_debug_on_fops);
return 0;
}
static int gsbi9_uart_notifier_cb(struct notifier_block *this,
unsigned long code, void *_cmd)
{
switch (code) {
case SUBSYS_AFTER_SHUTDOWN:
platform_device_unregister(msm_device_uart_gsbi9);
msm_device_uart_gsbi9 = msm_add_gsbi9_uart();
if (IS_ERR(msm_device_uart_gsbi9))
pr_err("%s(): Failed to create uart gsbi9 device\n",
__func__);
default:
break;
}
return NOTIFY_DONE;
}
static struct notifier_block gsbi9_nb = {
.notifier_call = gsbi9_uart_notifier_cb,
};
static int __init charm_modem_probe(struct platform_device *pdev)
{
int ret, irq;
struct charm_platform_data *d = pdev->dev.platform_data;
gpio_request(AP2MDM_STATUS, "AP2MDM_STATUS");
gpio_request(AP2MDM_ERRFATAL, "AP2MDM_ERRFATAL");
gpio_request(AP2MDM_KPDPWR_N, "AP2MDM_KPDPWR_N");
gpio_request(AP2MDM_PMIC_RESET_N, "AP2MDM_PMIC_RESET_N");
gpio_request(MDM2AP_STATUS, "MDM2AP_STATUS");
gpio_request(MDM2AP_ERRFATAL, "MDM2AP_ERRFATAL");
gpio_request(AP2MDM_WAKEUP, "AP2MDM_WAKEUP");
gpio_direction_output(AP2MDM_STATUS, 1);
gpio_direction_output(AP2MDM_ERRFATAL, 0);
gpio_direction_output(AP2MDM_WAKEUP, 0);
gpio_direction_input(MDM2AP_STATUS);
gpio_direction_input(MDM2AP_ERRFATAL);
power_on_charm = d->charm_modem_on;
power_down_charm = d->charm_modem_off;
charm_queue = create_singlethread_workqueue("charm_queue");
if (!charm_queue) {
pr_err("%s: could not create workqueue. All charm \
functionality will be disabled\n",
__func__);
ret = -ENOMEM;
goto fatal_err;
}
atomic_notifier_chain_register(&panic_notifier_list, &charm_panic_blk);
charm_debugfs_init();
charm_subsys = subsys_register(&charm_subsystem);
if (IS_ERR(charm_subsys)) {
ret = PTR_ERR(charm_subsys);
goto fatal_err;
}
subsys_default_online(charm_subsys);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
pr_err("%s: could not get MDM2AP_ERRFATAL IRQ resource. \
error=%d No IRQ will be generated on errfatal.",
__func__, irq);
goto errfatal_err;
}
ret = request_irq(irq, charm_errfatal,
IRQF_TRIGGER_RISING , "charm errfatal", NULL);
if (ret < 0) {
pr_err("%s: MDM2AP_ERRFATAL IRQ#%d request failed with error=%d\
. No IRQ will be generated on errfatal.",
__func__, irq, ret);
goto errfatal_err;
}
charm_errfatal_irq = irq;
errfatal_err:
irq = platform_get_irq(pdev, 1);
if (irq < 0) {
pr_err("%s: could not get MDM2AP_STATUS IRQ resource. \
error=%d No IRQ will be generated on status change.",
__func__, irq);
goto status_err;
}
ret = request_threaded_irq(irq, NULL, charm_status_change,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"charm status", NULL);
if (ret < 0) {
pr_err("%s: MDM2AP_STATUS IRQ#%d request failed with error=%d\
. No IRQ will be generated on status change.",
__func__, irq, ret);
goto status_err;
}
charm_status_irq = irq;
status_err:
subsys_notif_register_notifier("external_modem", &gsbi9_nb);
pr_info("%s: Registering charm modem\n", __func__);
return misc_register(&charm_modem_misc);
fatal_err:
gpio_free(AP2MDM_STATUS);
gpio_free(AP2MDM_ERRFATAL);
gpio_free(AP2MDM_KPDPWR_N);
gpio_free(AP2MDM_PMIC_RESET_N);
gpio_free(MDM2AP_STATUS);
gpio_free(MDM2AP_ERRFATAL);
return ret;
}
static int __devexit charm_modem_remove(struct platform_device *pdev)
{
gpio_free(AP2MDM_STATUS);
gpio_free(AP2MDM_ERRFATAL);
gpio_free(AP2MDM_KPDPWR_N);
gpio_free(AP2MDM_PMIC_RESET_N);
gpio_free(MDM2AP_STATUS);
gpio_free(MDM2AP_ERRFATAL);
return misc_deregister(&charm_modem_misc);
}
static void charm_modem_shutdown(struct platform_device *pdev)
{
int i;
CHARM_DBG("%s: setting AP2MDM_STATUS low for a graceful restart\n",
__func__);
charm_disable_irqs();
gpio_set_value(AP2MDM_STATUS, 0);
gpio_set_value(AP2MDM_WAKEUP, 1);
for (i = CHARM_MODEM_TIMEOUT; i > 0; i -= CHARM_MODEM_DELTA) {
pet_watchdog();
msleep(CHARM_MODEM_DELTA);
if (gpio_get_value(MDM2AP_STATUS) == 0)
break;
}
if (i <= 0) {
pr_err("%s: MDM2AP_STATUS never went low.\n",
__func__);
gpio_direction_output(AP2MDM_PMIC_RESET_N, 1);
for (i = CHARM_HOLD_TIME; i > 0; i -= CHARM_MODEM_DELTA) {
pet_watchdog();
msleep(CHARM_MODEM_DELTA);
}
gpio_direction_output(AP2MDM_PMIC_RESET_N, 0);
}
gpio_set_value(AP2MDM_WAKEUP, 0);
}
static struct platform_driver charm_modem_driver = {
.remove = charm_modem_remove,
.shutdown = charm_modem_shutdown,
.driver = {
.name = "charm_modem",
.owner = THIS_MODULE
},
};
static int __init charm_modem_init(void)
{
return platform_driver_probe(&charm_modem_driver, charm_modem_probe);
}
static void __exit charm_modem_exit(void)
{
platform_driver_unregister(&charm_modem_driver);
}
module_init(charm_modem_init);
module_exit(charm_modem_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("msm8660 charm modem driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("charm_modem");