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drivers/wwan/fm: Wake up modem on PEWAKE# signal change 

Create an event handler for the PEWAKE# GPIO and notify the device
driver to wake up the device.

BUG=b:301150499
TEST=Compiled and tested on google/redrix:
1. Enable runtime suspend for linux mtk_t7xx driver
2. Wait for device to enter suspended state
3. Modem should be able to wake up driver, e.g. on SIM card insert/eject
The interrupts should show up under /proc/interrupts as ACPI:Event

Signed-off-by: Paweł Anikiel <panikiel@google.com>
Change-Id: I32257689da85ea71f9de781093b3ede0cfe70a0e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78297
Reviewed-by: Jakub Czapiga <czapiga@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Paweł Anikiel 2023-10-16 14:22:15 +00:00 committed by Jakub Czapiga
parent 97cd5bdeae
commit 1a59390f2d
1 changed files with 54 additions and 0 deletions
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54
src/drivers/wwan/fm/acpi_fm350gl.c
View File

@ -2,6 +2,8 @@
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <gpio.h>
#include <stdio.h>
#include "chip.h"
#include "soc/intel/common/block/include/intelblocks/acpi.h"
#include "soc/intel/common/block/pcie/rtd3/chip.h"
@ -263,6 +265,55 @@ static const char *wwan_fm350gl_acpi_name(const struct device *dev)
return "PXSX";
}
static void
wwan_fm350gl_acpi_event_interrupts(const struct acpi_gpio *wake_gpio)
{
acpigen_write_name("_AEI");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(wake_gpio);
acpigen_write_resourcetemplate_footer();
}
static void
wwan_fm350gl_acpi_event_method(const struct device *dev,
const struct acpi_gpio *wake_gpio)
{
char name[5];
uint16_t pin;
pin = wake_gpio->pins[0];
if (CONFIG(GENERIC_GPIO_LIB))
pin = gpio_acpi_pin(pin);
if (pin > 0xff) {
printk(BIOS_ERR, "%s: pins above 0xFF are unsupported (pin %u)\n",
__func__, pin);
return;
}
snprintf(name, sizeof(name), "_%c%02X",
wake_gpio->irq.mode == ACPI_IRQ_EDGE_TRIGGERED ? 'E' : 'L', pin);
acpigen_write_method_serialized(name, 0);
acpigen_notify(acpi_device_path(dev), 0x02); /* NOTIFY_DEVICE_WAKE */
acpigen_write_method_end();
}
static void wwan_fm350gl_acpi_gpio_events(const struct device *dev)
{
const struct drivers_wwan_fm_config *config = config_of(dev);
const struct acpi_gpio *wake_gpio = &config->wake_gpio;
/* Write into GPIO controller's scope */
if (CONFIG(GENERIC_GPIO_LIB))
acpigen_write_scope(wake_gpio->resource ? : gpio_acpi_path(wake_gpio->pins[0]));
else
acpigen_write_scope(wake_gpio->resource);
wwan_fm350gl_acpi_event_interrupts(wake_gpio);
wwan_fm350gl_acpi_event_method(dev, wake_gpio);
acpigen_write_scope_end();
}
static void wwan_fm350gl_acpi_fill_ssdt(const struct device *dev)
{
const struct drivers_wwan_fm_config *config = config_of(dev);
@ -323,6 +374,9 @@ static void wwan_fm350gl_acpi_fill_ssdt(const struct device *dev)
acpigen_write_device_end(); /* Device */
}
acpigen_write_scope_end(); /* Scope */
if (config->wake_gpio.pin_count && config->wake_gpio.type == ACPI_GPIO_TYPE_INTERRUPT)
wwan_fm350gl_acpi_gpio_events(dev);
}
static struct device_operations wwan_fm350gl_ops = {