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linux/drivers/ssb/driver_gpio.c
Sebastian Andrzej Siewior f285de7956 ssb: gpio: Use generic_handle_irq_safe() 
On PREEMPT_RT enabled kernels the demultiplex interrupt handler is force
threaded and runs with interrupts enabled. The invocation of
generic_handle_domain_irq() with interrupts enabled triggers a lockdep
warning due to a non-irq safe lock acquisition.

Instead of disabling interrupts on the driver level, use
generic_handle_domain_irq_safe().

[ tglx: Split out from combo patch ]

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/YnkfWFzvusFFktSt@linutronix.de
2022-09-19 15:08:38 +02:00

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/*
* Sonics Silicon Backplane
* GPIO driver
*
* Copyright 2011, Broadcom Corporation
* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "ssb_private.h"
#include <linux/gpio/driver.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/export.h>
#include <linux/ssb/ssb.h>
/**************************************************
* Shared
**************************************************/
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
if (bus->bustype == SSB_BUSTYPE_SSB)
return irq_find_mapping(bus->irq_domain, gpio);
else
return -EINVAL;
}
#endif
/**************************************************
* ChipCommon
**************************************************/
static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
}
static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned int gpio,
int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
}
static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
return 0;
}
static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
unsigned int gpio, int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
return 0;
}
static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
/* clear pulldown */
ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
/* Set pullup */
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);
return 0;
}
static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
/* clear pullup */
ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
}
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
}
static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));
ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
}
static struct irq_chip ssb_gpio_irq_chipco_chip = {
.name = "SSB-GPIO-CC",
.irq_mask = ssb_gpio_irq_chipco_mask,
.irq_unmask = ssb_gpio_irq_chipco_unmask,
};
static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
{
struct ssb_bus *bus = dev_id;
struct ssb_chipcommon *chipco = &bus->chipco;
u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
unsigned long irqs = (val ^ pol) & mask;
int gpio;
if (!irqs)
return IRQ_NONE;
for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
generic_handle_domain_irq_safe(bus->irq_domain, gpio);
ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
return IRQ_HANDLED;
}
static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
{
struct ssb_chipcommon *chipco = &bus->chipco;
struct gpio_chip *chip = &bus->gpio;
int gpio, hwirq, err;
if (bus->bustype != SSB_BUSTYPE_SSB)
return 0;
bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
&irq_domain_simple_ops, chipco);
if (!bus->irq_domain) {
err = -ENODEV;
goto err_irq_domain;
}
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_create_mapping(bus->irq_domain, gpio);
irq_set_chip_data(irq, bus);
irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
handle_simple_irq);
}
hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
"gpio", bus);
if (err)
goto err_req_irq;
ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
return 0;
err_req_irq:
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
err_irq_domain:
return err;
}
static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
{
struct ssb_chipcommon *chipco = &bus->chipco;
struct gpio_chip *chip = &bus->gpio;
int gpio;
if (bus->bustype != SSB_BUSTYPE_SSB)
return;
chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
}
#else
static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
{
return 0;
}
static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
{
}
#endif
static int ssb_gpio_chipco_init(struct ssb_bus *bus)
{
struct gpio_chip *chip = &bus->gpio;
int err;
chip->label = "ssb_chipco_gpio";
chip->owner = THIS_MODULE;
chip->request = ssb_gpio_chipco_request;
chip->free = ssb_gpio_chipco_free;
chip->get = ssb_gpio_chipco_get_value;
chip->set = ssb_gpio_chipco_set_value;
chip->direction_input = ssb_gpio_chipco_direction_input;
chip->direction_output = ssb_gpio_chipco_direction_output;
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
chip->to_irq = ssb_gpio_to_irq;
#endif
chip->ngpio = 16;
/* There is just one SoC in one device and its GPIO addresses should be
* deterministic to address them more easily. The other buses could get
* a random base number.
*/
if (bus->bustype == SSB_BUSTYPE_SSB)
chip->base = 0;
else
chip->base = -1;
err = ssb_gpio_irq_chipco_domain_init(bus);
if (err)
return err;
err = gpiochip_add_data(chip, bus);
if (err) {
ssb_gpio_irq_chipco_domain_exit(bus);
return err;
}
return 0;
}
/**************************************************
* EXTIF
**************************************************/
#ifdef CONFIG_SSB_DRIVER_EXTIF
static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
}
static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned int gpio,
int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
}
static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
unsigned int gpio)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
return 0;
}
static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
unsigned int gpio, int value)
{
struct ssb_bus *bus = gpiochip_get_data(chip);
ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
return 0;
}
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
static void ssb_gpio_irq_extif_mask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
}
static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
{
struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
int gpio = irqd_to_hwirq(d);
u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));
ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
}
static struct irq_chip ssb_gpio_irq_extif_chip = {
.name = "SSB-GPIO-EXTIF",
.irq_mask = ssb_gpio_irq_extif_mask,
.irq_unmask = ssb_gpio_irq_extif_unmask,
};
static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
{
struct ssb_bus *bus = dev_id;
struct ssb_extif *extif = &bus->extif;
u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
unsigned long irqs = (val ^ pol) & mask;
int gpio;
if (!irqs)
return IRQ_NONE;
for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
generic_handle_domain_irq_safe(bus->irq_domain, gpio);
ssb_extif_gpio_polarity(extif, irqs, val & irqs);
return IRQ_HANDLED;
}
static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
{
struct ssb_extif *extif = &bus->extif;
struct gpio_chip *chip = &bus->gpio;
int gpio, hwirq, err;
if (bus->bustype != SSB_BUSTYPE_SSB)
return 0;
bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
&irq_domain_simple_ops, extif);
if (!bus->irq_domain) {
err = -ENODEV;
goto err_irq_domain;
}
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_create_mapping(bus->irq_domain, gpio);
irq_set_chip_data(irq, bus);
irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
handle_simple_irq);
}
hwirq = ssb_mips_irq(bus->extif.dev) + 2;
err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
"gpio", bus);
if (err)
goto err_req_irq;
ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
return 0;
err_req_irq:
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
err_irq_domain:
return err;
}
static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
{
struct ssb_extif *extif = &bus->extif;
struct gpio_chip *chip = &bus->gpio;
int gpio;
if (bus->bustype != SSB_BUSTYPE_SSB)
return;
free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
for (gpio = 0; gpio < chip->ngpio; gpio++) {
int irq = irq_find_mapping(bus->irq_domain, gpio);
irq_dispose_mapping(irq);
}
irq_domain_remove(bus->irq_domain);
}
#else
static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
{
return 0;
}
static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
{
}
#endif
static int ssb_gpio_extif_init(struct ssb_bus *bus)
{
struct gpio_chip *chip = &bus->gpio;
int err;
chip->label = "ssb_extif_gpio";
chip->owner = THIS_MODULE;
chip->get = ssb_gpio_extif_get_value;
chip->set = ssb_gpio_extif_set_value;
chip->direction_input = ssb_gpio_extif_direction_input;
chip->direction_output = ssb_gpio_extif_direction_output;
#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
chip->to_irq = ssb_gpio_to_irq;
#endif
chip->ngpio = 5;
/* There is just one SoC in one device and its GPIO addresses should be
* deterministic to address them more easily. The other buses could get
* a random base number.
*/
if (bus->bustype == SSB_BUSTYPE_SSB)
chip->base = 0;
else
chip->base = -1;
err = ssb_gpio_irq_extif_domain_init(bus);
if (err)
return err;
err = gpiochip_add_data(chip, bus);
if (err) {
ssb_gpio_irq_extif_domain_exit(bus);
return err;
}
return 0;
}
#else
static int ssb_gpio_extif_init(struct ssb_bus *bus)
{
return -ENOTSUPP;
}
#endif
/**************************************************
* Init
**************************************************/
int ssb_gpio_init(struct ssb_bus *bus)
{
if (ssb_chipco_available(&bus->chipco))
return ssb_gpio_chipco_init(bus);
else if (ssb_extif_available(&bus->extif))
return ssb_gpio_extif_init(bus);
return -1;
}
int ssb_gpio_unregister(struct ssb_bus *bus)
{
if (ssb_chipco_available(&bus->chipco) ||
ssb_extif_available(&bus->extif)) {
gpiochip_remove(&bus->gpio);
return 0;
}
return -1;
}
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