blob: 9f06cf6b29250b9cff7d1ece66b9147ccf6c94e5 [file] [log] [blame]
/* Copyright (c) 2011-2012, 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 <linux/mfd/pmic8058.h>
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <mach/mdm2.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"
#include "mdm_private.h"
#define MDM_PBLRDY_CNT 20
static int mdm_debug_mask;
static int power_on_count;
static int hsic_peripheral_status;
static DEFINE_MUTEX(hsic_status_lock);
static void mdm_peripheral_connect(struct mdm_modem_drv *mdm_drv)
{
if (!mdm_drv->pdata->peripheral_platform_device)
return;
mutex_lock(&hsic_status_lock);
if (hsic_peripheral_status)
goto out;
platform_device_add(mdm_drv->pdata->peripheral_platform_device);
hsic_peripheral_status = 1;
out:
mutex_unlock(&hsic_status_lock);
}
static void mdm_peripheral_disconnect(struct mdm_modem_drv *mdm_drv)
{
if (!mdm_drv->pdata->peripheral_platform_device)
return;
mutex_lock(&hsic_status_lock);
if (!hsic_peripheral_status)
goto out;
platform_device_del(mdm_drv->pdata->peripheral_platform_device);
hsic_peripheral_status = 0;
out:
mutex_unlock(&hsic_status_lock);
}
/* This function can be called from atomic context. */
static void mdm_toggle_soft_reset(struct mdm_modem_drv *mdm_drv)
{
int soft_reset_direction_assert = 0,
soft_reset_direction_de_assert = 1;
if (mdm_drv->pdata->soft_reset_inverted) {
soft_reset_direction_assert = 1;
soft_reset_direction_de_assert = 0;
}
gpio_direction_output(mdm_drv->ap2mdm_soft_reset_gpio,
soft_reset_direction_assert);
/* Use mdelay because this function can be called from atomic
* context.
*/
mdelay(10);
gpio_direction_output(mdm_drv->ap2mdm_soft_reset_gpio,
soft_reset_direction_de_assert);
}
/* This function can be called from atomic context. */
static void mdm_atomic_soft_reset(struct mdm_modem_drv *mdm_drv)
{
mdm_toggle_soft_reset(mdm_drv);
}
static void mdm_power_down_common(struct mdm_modem_drv *mdm_drv)
{
int i;
int soft_reset_direction =
mdm_drv->pdata->soft_reset_inverted ? 1 : 0;
mdm_peripheral_disconnect(mdm_drv);
/* Wait for the modem to complete its power down actions. */
for (i = 20; i > 0; i--) {
if (gpio_get_value(mdm_drv->mdm2ap_status_gpio) == 0) {
if (mdm_debug_mask & MDM_DEBUG_MASK_SHDN_LOG)
pr_info("%s: mdm2ap_status went low, i = %d\n",
__func__, i);
break;
}
msleep(100);
}
/* Assert the soft reset line whether mdm2ap_status went low or not */
gpio_direction_output(mdm_drv->ap2mdm_soft_reset_gpio,
soft_reset_direction);
if (i == 0) {
pr_err("%s: MDM2AP_STATUS never went low. Doing a hard reset\n",
__func__);
/*
* Currently, there is a debounce timer on the charm PMIC. It is
* necessary to hold the PMIC RESET low for ~3.5 seconds
* for the reset to fully take place. Sleep here to ensure the
* reset has occured before the function exits.
*/
msleep(4000);
}
}
static void mdm_do_first_power_on(struct mdm_modem_drv *mdm_drv)
{
int i;
int pblrdy;
if (power_on_count != 1) {
pr_err("%s: Calling fn when power_on_count != 1\n",
__func__);
return;
}
pr_err("%s: Powering on modem for the first time\n", __func__);
mdm_peripheral_disconnect(mdm_drv);
/* If this is the first power-up after a panic, the modem may still
* be in a power-on state, in which case we need to toggle the gpio
* instead of just de-asserting it. No harm done if the modem was
* powered down.
*/
mdm_toggle_soft_reset(mdm_drv);
/* If the device has a kpd pwr gpio then toggle it. */
if (GPIO_IS_VALID(mdm_drv->ap2mdm_kpdpwr_n_gpio)) {
/* Pull AP2MDM_KPDPWR gpio high and wait for PS_HOLD to settle,
* then pull it back low.
*/
pr_debug("%s: Pulling AP2MDM_KPDPWR gpio high\n", __func__);
gpio_direction_output(mdm_drv->ap2mdm_kpdpwr_n_gpio, 1);
msleep(1000);
gpio_direction_output(mdm_drv->ap2mdm_kpdpwr_n_gpio, 0);
}
if (!GPIO_IS_VALID(mdm_drv->mdm2ap_pblrdy))
goto start_mdm_peripheral;
for (i = 0; i < MDM_PBLRDY_CNT; i++) {
pblrdy = gpio_get_value(mdm_drv->mdm2ap_pblrdy);
if (pblrdy)
break;
usleep_range(5000, 5000);
}
pr_debug("%s: i:%d\n", __func__, i);
start_mdm_peripheral:
mdm_peripheral_connect(mdm_drv);
msleep(200);
}
static void mdm_do_soft_power_on(struct mdm_modem_drv *mdm_drv)
{
int i;
int pblrdy;
pr_err("%s: soft resetting mdm modem\n", __func__);
mdm_peripheral_disconnect(mdm_drv);
mdm_toggle_soft_reset(mdm_drv);
if (!GPIO_IS_VALID(mdm_drv->mdm2ap_pblrdy))
goto start_mdm_peripheral;
for (i = 0; i < MDM_PBLRDY_CNT; i++) {
pblrdy = gpio_get_value(mdm_drv->mdm2ap_pblrdy);
if (pblrdy)
break;
usleep_range(5000, 5000);
}
pr_debug("%s: i:%d\n", __func__, i);
start_mdm_peripheral:
mdm_peripheral_connect(mdm_drv);
msleep(200);
}
static void mdm_power_on_common(struct mdm_modem_drv *mdm_drv)
{
power_on_count++;
/* this gpio will be used to indicate apq readiness,
* de-assert it now so that it can be asserted later.
* May not be used.
*/
if (GPIO_IS_VALID(mdm_drv->ap2mdm_wakeup_gpio))
gpio_direction_output(mdm_drv->ap2mdm_wakeup_gpio, 0);
/*
* If we did an "early power on" then ignore the very next
* power-on request because it would the be first request from
* user space but we're already powered on. Ignore it.
*/
if (mdm_drv->pdata->early_power_on &&
(power_on_count == 2))
return;
if (power_on_count == 1)
mdm_do_first_power_on(mdm_drv);
else
mdm_do_soft_power_on(mdm_drv);
}
static void debug_state_changed(int value)
{
mdm_debug_mask = value;
}
static void mdm_status_changed(struct mdm_modem_drv *mdm_drv, int value)
{
pr_debug("%s: value:%d\n", __func__, value);
if (value) {
mdm_peripheral_disconnect(mdm_drv);
mdm_peripheral_connect(mdm_drv);
if (GPIO_IS_VALID(mdm_drv->ap2mdm_wakeup_gpio))
gpio_direction_output(mdm_drv->ap2mdm_wakeup_gpio, 1);
}
}
static void mdm_image_upgrade(struct mdm_modem_drv *mdm_drv, int type)
{
switch (type) {
case APQ_CONTROLLED_UPGRADE:
pr_debug("%s APQ controlled modem image upgrade\n", __func__);
mdm_drv->mdm_ready = 0;
mdm_toggle_soft_reset(mdm_drv);
break;
case MDM_CONTROLLED_UPGRADE:
pr_debug("%s MDM controlled modem image upgrade\n", __func__);
mdm_drv->mdm_ready = 0;
/*
* If we have no image currently present on the modem, then we
* would be in PBL, in which case the status gpio would not go
* high.
*/
mdm_drv->disable_status_check = 1;
if (GPIO_IS_VALID(mdm_drv->usb_switch_gpio)) {
pr_info("%s Switching usb control to MDM\n", __func__);
gpio_direction_output(mdm_drv->usb_switch_gpio, 1);
} else
pr_err("%s usb switch gpio unavailable\n", __func__);
break;
default:
pr_err("%s invalid upgrade type\n", __func__);
}
}
static struct mdm_ops mdm_cb = {
.power_on_mdm_cb = mdm_power_on_common,
.reset_mdm_cb = mdm_power_on_common,
.atomic_reset_mdm_cb = mdm_atomic_soft_reset,
.power_down_mdm_cb = mdm_power_down_common,
.debug_state_changed_cb = debug_state_changed,
.status_cb = mdm_status_changed,
.image_upgrade_cb = mdm_image_upgrade,
};
static int __init mdm_modem_probe(struct platform_device *pdev)
{
return mdm_common_create(pdev, &mdm_cb);
}
static int __devexit mdm_modem_remove(struct platform_device *pdev)
{
return mdm_common_modem_remove(pdev);
}
static void mdm_modem_shutdown(struct platform_device *pdev)
{
mdm_common_modem_shutdown(pdev);
}
static struct platform_driver mdm_modem_driver = {
.remove = mdm_modem_remove,
.shutdown = mdm_modem_shutdown,
.driver = {
.name = "mdm2_modem",
.owner = THIS_MODULE
},
};
static int __init mdm_modem_init(void)
{
return platform_driver_probe(&mdm_modem_driver, mdm_modem_probe);
}
static void __exit mdm_modem_exit(void)
{
platform_driver_unregister(&mdm_modem_driver);
}
module_init(mdm_modem_init);
module_exit(mdm_modem_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("mdm modem driver");
MODULE_VERSION("2.0");
MODULE_ALIAS("mdm_modem");