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/* Copyright (c) 2014-2015, 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 "esoc-mdm.h"
/* This function can be called from atomic context. */
static int mdm4x_toggle_soft_reset(struct mdm_ctrl *mdm, bool atomic)
{
int soft_reset_direction_assert = 0,
soft_reset_direction_de_assert = 1;
if (mdm->soft_reset_inverted) {
soft_reset_direction_assert = 1;
soft_reset_direction_de_assert = 0;
}
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction_assert);
/*
* Allow PS hold assert to be detected
*/
if (!atomic)
usleep_range(8000, 9000);
else
mdelay(6);
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction_de_assert);
return 0;
}
/* This function can be called from atomic context. */
static int mdm9x55_toggle_soft_reset(struct mdm_ctrl *mdm, bool atomic)
{
int soft_reset_direction_assert = 0,
soft_reset_direction_de_assert = 1;
if (mdm->soft_reset_inverted) {
soft_reset_direction_assert = 1;
soft_reset_direction_de_assert = 0;
}
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction_assert);
/*
* Allow PS hold assert to be detected
*/
if (!atomic)
usleep_range(203000, 300000);
else
mdelay(203);
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction_de_assert);
return 0;
}
static int mdm4x_do_first_power_on(struct mdm_ctrl *mdm)
{
int i;
int pblrdy;
struct device *dev = mdm->dev;
dev_dbg(dev, "Powering on modem for the first time\n");
mdm_toggle_soft_reset(mdm, false);
/* Add a delay to allow PON sequence to complete*/
msleep(50);
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_STATUS), 1);
if (gpio_is_valid(MDM_GPIO(mdm, MDM2AP_PBLRDY))) {
for (i = 0; i < MDM_PBLRDY_CNT; i++) {
pblrdy = gpio_get_value(MDM_GPIO(mdm, MDM2AP_PBLRDY));
if (pblrdy)
break;
usleep_range(5000, 6000);
}
dev_dbg(dev, "pblrdy i:%d\n", i);
msleep(200);
}
/*
* No PBLRDY gpio associated with this modem
* Send request for image. Let userspace confirm establishment of
* link to external modem.
*/
else
esoc_clink_queue_request(ESOC_REQ_IMG, mdm->esoc);
return 0;
}
static int mdm4x_power_down(struct mdm_ctrl *mdm)
{
struct device *dev = mdm->dev;
int soft_reset_direction = mdm->soft_reset_inverted ? 1 : 0;
/* Assert the soft reset line whether mdm2ap_status went low or not */
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction);
dev_dbg(dev, "Doing a hard reset\n");
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction);
/*
* Currently, there is a debounce timer on the charm PMIC. It is
* necessary to hold the PMIC RESET low for 400ms
* for the reset to fully take place. Sleep here to ensure the
* reset has occurred before the function exits.
*/
msleep(400);
return 0;
}
static int mdm9x55_power_down(struct mdm_ctrl *mdm)
{
struct device *dev = mdm->dev;
int soft_reset_direction = mdm->soft_reset_inverted ? 1 : 0;
/* Assert the soft reset line whether mdm2ap_status went low or not */
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction);
dev_dbg(dev, "Doing a hard reset\n");
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
soft_reset_direction);
/*
* Currently, there is a debounce timer on the charm PMIC. It is
* necessary to hold the PMIC RESET low for 406ms
* for the reset to fully take place. Sleep here to ensure the
* reset has occurred before the function exits.
*/
msleep(406);
return 0;
}
static void mdm4x_cold_reset(struct mdm_ctrl *mdm)
{
dev_dbg(mdm->dev, "Triggering mdm cold reset");
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
!!mdm->soft_reset_inverted);
msleep(300);
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
!mdm->soft_reset_inverted);
}
static void mdm9x55_cold_reset(struct mdm_ctrl *mdm)
{
dev_dbg(mdm->dev, "Triggering mdm cold reset");
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
!!mdm->soft_reset_inverted);
mdelay(334);
gpio_direction_output(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
!mdm->soft_reset_inverted);
}
static int mdm4x_pon_dt_init(struct mdm_ctrl *mdm)
{
int val;
struct device_node *node = mdm->dev->of_node;
enum of_gpio_flags flags = OF_GPIO_ACTIVE_LOW;
val = of_get_named_gpio_flags(node, "qcom,ap2mdm-soft-reset-gpio",
0, &flags);
if (val >= 0) {
MDM_GPIO(mdm, AP2MDM_SOFT_RESET) = val;
if (flags & OF_GPIO_ACTIVE_LOW)
mdm->soft_reset_inverted = 1;
return 0;
} else
return -EIO;
}
static int mdm4x_pon_setup(struct mdm_ctrl *mdm)
{
struct device *dev = mdm->dev;
if (gpio_is_valid(MDM_GPIO(mdm, AP2MDM_SOFT_RESET))) {
if (gpio_request(MDM_GPIO(mdm, AP2MDM_SOFT_RESET),
"AP2MDM_SOFT_RESET")) {
dev_err(dev, "Cannot config AP2MDM_SOFT_RESET gpio\n");
return -EIO;
}
}
return 0;
}
struct mdm_pon_ops mdm9x25_pon_ops = {
.pon = mdm4x_do_first_power_on,
.soft_reset = mdm4x_toggle_soft_reset,
.poff_force = mdm4x_power_down,
.cold_reset = mdm4x_cold_reset,
.dt_init = mdm4x_pon_dt_init,
.setup = mdm4x_pon_setup,
};
struct mdm_pon_ops mdm9x35_pon_ops = {
.pon = mdm4x_do_first_power_on,
.soft_reset = mdm4x_toggle_soft_reset,
.poff_force = mdm4x_power_down,
.cold_reset = mdm4x_cold_reset,
.dt_init = mdm4x_pon_dt_init,
.setup = mdm4x_pon_setup,
};
struct mdm_pon_ops mdm9x45_pon_ops = {
.pon = mdm4x_do_first_power_on,
.soft_reset = mdm4x_toggle_soft_reset,
.poff_force = mdm4x_power_down,
.cold_reset = mdm4x_cold_reset,
.dt_init = mdm4x_pon_dt_init,
.setup = mdm4x_pon_setup,
};
struct mdm_pon_ops mdm9x55_pon_ops = {
.pon = mdm4x_do_first_power_on,
.soft_reset = mdm9x55_toggle_soft_reset,
.poff_force = mdm9x55_power_down,
.cold_reset = mdm9x55_cold_reset,
.dt_init = mdm4x_pon_dt_init,
.setup = mdm4x_pon_setup,
};
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