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misc: microchip: pci1xxxx: Add gpio irq handler and irq helper functi…
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…ons irq_ack, irq_mask, irq_unmask and irq_set_type of irq_chip.

The helper functions irq_set_type, irq_mask, irq_unmask and
irq_ack configure the interrupt type, mask, unmask and
acknowledge the interrupts.

Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>
Link: https://lore.kernel.org/r/20220824200047.150308-5-kumaravel.thiagarajan@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Kumaravel Thiagarajan authored and Greg Kroah-Hartman committed Sep 2, 2022
1 parent 9b91a36 commit 1f4d8ae
Showing 1 changed file with 159 additions and 0 deletions.
159 changes: 159 additions & 0 deletions drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>

#include "mchp_pci1xxxx_gp.h"

Expand All @@ -20,6 +21,13 @@
#define PULLUP_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x40)
#define PULLDOWN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x50)
#define OPENDRAIN_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x60)
#define WAKEMASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x70)
#define MODE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0x80)
#define INTR_LO_TO_HI_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0x90)
#define INTR_HI_TO_LO_EDGE_CONFIG(x) ((((x) / 32) * 4) + 0x400 + 0xA0)
#define INTR_LEVEL_CONFIG_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xB0)
#define INTR_LEVEL_MASK_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xC0)
#define INTR_STAT_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xD0)
#define DEBOUNCE_OFFSET(x) ((((x) / 32) * 4) + 0x400 + 0xE0)
#define PIO_GLOBAL_CONFIG_OFFSET (0x400 + 0xF0)
#define PIO_PCI_CTRL_REG_OFFSET (0x400 + 0xF4)
Expand Down Expand Up @@ -148,9 +156,146 @@ static int pci1xxxx_gpio_set_config(struct gpio_chip *gpio, unsigned int offset,
return ret;
}

static void pci1xxxx_gpio_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned long flags;

spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, INTR_STAT_OFFSET(gpio), (gpio % 32), true);
spin_unlock_irqrestore(&priv->lock, flags);
}

static void pci1xxxx_gpio_irq_set_mask(struct irq_data *data, bool set)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned long flags;

spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, INTR_MASK_OFFSET(gpio), (gpio % 32), set);
spin_unlock_irqrestore(&priv->lock, flags);
}

static void pci1xxxx_gpio_irq_mask(struct irq_data *data)
{
pci1xxxx_gpio_irq_set_mask(data, true);
}

static void pci1xxxx_gpio_irq_unmask(struct irq_data *data)
{
pci1xxxx_gpio_irq_set_mask(data, false);
}

static int pci1xxxx_gpio_set_type(struct irq_data *data, unsigned int trigger_type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct pci1xxxx_gpio *priv = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
unsigned int bitpos = gpio % 32;

if (trigger_type & IRQ_TYPE_EDGE_FALLING) {
pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio),
bitpos, false);
irq_set_handler_locked(data, handle_edge_irq);
} else {
pci1xxx_assign_bit(priv->reg_base, INTR_HI_TO_LO_EDGE_CONFIG(gpio),
bitpos, true);
}

if (trigger_type & IRQ_TYPE_EDGE_RISING) {
pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
false);
irq_set_handler_locked(data, handle_edge_irq);
} else {
pci1xxx_assign_bit(priv->reg_base, INTR_LO_TO_HI_EDGE_CONFIG(gpio),
bitpos, true);
}

if (trigger_type & IRQ_TYPE_LEVEL_LOW) {
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio),
bitpos, true);
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
true);
irq_set_handler_locked(data, handle_edge_irq);
}

if (trigger_type & IRQ_TYPE_LEVEL_HIGH) {
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_CONFIG_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio),
bitpos, false);
pci1xxx_assign_bit(priv->reg_base, MODE_OFFSET(gpio), bitpos,
true);
irq_set_handler_locked(data, handle_edge_irq);
}

if ((!(trigger_type & IRQ_TYPE_LEVEL_LOW)) && (!(trigger_type & IRQ_TYPE_LEVEL_HIGH)))
pci1xxx_assign_bit(priv->reg_base, INTR_LEVEL_MASK_OFFSET(gpio), bitpos, true);

return true;
}

static irqreturn_t pci1xxxx_gpio_irq_handler(int irq, void *dev_id)
{
struct pci1xxxx_gpio *priv = dev_id;
struct gpio_chip *gc = &priv->gpio;
unsigned long int_status = 0;
unsigned long flags;
u8 pincount;
int bit;
u8 gpiobank;

spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, true);
spin_unlock_irqrestore(&priv->lock, flags);
for (gpiobank = 0; gpiobank < 3; gpiobank++) {
spin_lock_irqsave(&priv->lock, flags);
int_status = readl(priv->reg_base + INTR_STATUS_OFFSET(gpiobank));
spin_unlock_irqrestore(&priv->lock, flags);
if (gpiobank == 2)
pincount = 29;
else
pincount = 32;
for_each_set_bit(bit, &int_status, pincount) {
unsigned int irq;

spin_lock_irqsave(&priv->lock, flags);
writel(BIT(bit), priv->reg_base + INTR_STATUS_OFFSET(gpiobank));
spin_unlock_irqrestore(&priv->lock, flags);
irq = irq_find_mapping(gc->irq.domain, (bit + (gpiobank * 32)));
generic_handle_irq(irq);
}
}
spin_lock_irqsave(&priv->lock, flags);
pci1xxx_assign_bit(priv->reg_base, PIO_GLOBAL_CONFIG_OFFSET, 16, false);
spin_unlock_irqrestore(&priv->lock, flags);

return IRQ_HANDLED;
}

static struct irq_chip pci1xxxx_gpio_irqchip = {
.name = "pci1xxxx_gpio",
.irq_ack = pci1xxxx_gpio_irq_ack,
.irq_mask = pci1xxxx_gpio_irq_mask,
.irq_unmask = pci1xxxx_gpio_irq_unmask,
.irq_set_type = pci1xxxx_gpio_set_type,
};

static int pci1xxxx_gpio_setup(struct pci1xxxx_gpio *priv, int irq)
{
struct gpio_chip *gchip = &priv->gpio;
struct gpio_irq_chip *girq;
int retval;

gchip->label = dev_name(&priv->aux_dev->dev);
gchip->parent = &priv->aux_dev->dev;
Expand All @@ -166,6 +311,20 @@ static int pci1xxxx_gpio_setup(struct pci1xxxx_gpio *priv, int irq)
gchip->ngpio = PCI1XXXX_NR_PINS;
gchip->can_sleep = false;

retval = devm_request_threaded_irq(&priv->aux_dev->dev, irq,
NULL, pci1xxxx_gpio_irq_handler,
IRQF_ONESHOT, "PCI1xxxxGPIO", priv);

if (retval)
return retval;

girq = &priv->gpio.irq;
girq->chip = &pci1xxxx_gpio_irqchip;
girq->parent_handler = NULL;
girq->num_parents = 0;
girq->parents = NULL;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_bad_irq;
return 0;
}

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