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/*
* drivers/misc/tegra-baseband/bb-m7400.c
*
* Copyright (c) 2011, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/resource.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/usb.h>
#include <linux/wakelock.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <mach/tegra-bb-power.h>
#include "bb-power.h"
static struct tegra_bb_gpio_data m7400_gpios[] = {
{ { GPIO_INVALID, GPIOF_OUT_INIT_LOW, "MDM_PWR_ON" }, true },
{ { GPIO_INVALID, GPIOF_IN, "MDM_PWRSTATUS" }, true },
{ { GPIO_INVALID, GPIOF_IN, "MDM_SERVICE" }, true },
{ { GPIO_INVALID, GPIOF_OUT_INIT_HIGH, "MDM_USB_AWR" }, false },
{ { GPIO_INVALID, GPIOF_IN, "MDM_USB_CWR" }, false },
{ { GPIO_INVALID, GPIOF_IN, "MDM_RESOUT2" }, true },
{ { GPIO_INVALID, 0, NULL }, false }, /* End of table */
};
static int gpio_wait_timeout(int gpio, int value, int timeout_msec)
{
int count;
for (count = 0; count < timeout_msec; ++count) {
if (gpio_get_value(gpio) == value)
return 0;
mdelay(1);
}
return -1;
}
static int baseband_l3_suspend(void)
{
int gpio_awr = m7400_gpios[3].data.gpio;
/* Signal L3 to modem - Drive USB_AWR low. */
gpio_set_value(gpio_awr, 0);
return 0;
}
static int baseband_l3_resume(void)
{
int gpio_awr = m7400_gpios[3].data.gpio;
int gpio_cwr = m7400_gpios[4].data.gpio;
/* Signal L0 to modem - Drive USB_AWR high. */
gpio_set_value(gpio_awr, 1);
/* If this is a AP driven wakeup, wait for CP
to ack by driving USB_CWR high.
If this is a CP driven wakeup, USB_CWR will
be high already. AP has already driven it's
response as above.
*/
if (gpio_wait_timeout(gpio_cwr, 1, 10) != 0)
pr_info("%s: timeout waiting for modem ack.\n", __func__);
return 0;
}
static irqreturn_t baseband_wake_irq(int irq, void *dev_id)
{
pr_info("%s {\n", __func__);
/* Resume usb host activity. */
/* TBD */
return IRQ_HANDLED;
}
int m7400_power_callback(int code)
{
switch (code) {
case CB_CODE_L0L2:
break;
case CB_CODE_L2L0:
break;
case CB_CODE_L2L3:
baseband_l3_suspend();
break;
case CB_CODE_L3L0:
baseband_l3_resume();
break;
default:
break;
}
return 0;
}
static struct tegra_bb_gpio_irqdata m7400_gpioirqs[] = {
{ GPIO_INVALID, "tegra_bb_wake", baseband_wake_irq,
IRQF_TRIGGER_RISING, NULL },
{ GPIO_INVALID, NULL, NULL, 0, NULL }, /* End of table */
};
static struct tegra_bb_power_gdata m7400_gdata = {
.gpio = m7400_gpios,
.gpioirq = m7400_gpioirqs,
};
void *m7400_init(void *pdata, int code)
{
struct tegra_bb_pdata *platdata = (struct tegra_bb_pdata *) pdata;
union tegra_bb_gpio_id *id = platdata->id;
if (code == CB_CODE_INIT) {
/* Fill the gpio ids allocated by hardware */
m7400_gpios[0].data.gpio = id->m7400.pwr_on;
m7400_gpios[1].data.gpio = id->m7400.pwr_status;
m7400_gpios[2].data.gpio = id->m7400.service;
m7400_gpios[3].data.gpio = id->m7400.usb_awr;
m7400_gpios[4].data.gpio = id->m7400.usb_cwr;
m7400_gpios[5].data.gpio = id->m7400.resout2;
m7400_gpioirqs[0].id = id->m7400.usb_cwr;
}
return (void *) &m7400_gdata;
}
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