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Subject[PATCH 2/2] gpio: sch: Add interrupt support
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

Validated on the Quark platform, this adds interrupt support on rising
and/or falling edges.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
drivers/gpio/gpio-sch.c | 142 +++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 135 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
index fb143f28c386..9459f1920996 100644
--- a/drivers/gpio/gpio-sch.c
+++ b/drivers/gpio/gpio-sch.c
@@ -18,12 +18,17 @@
#define GEN 0x00
#define GIO 0x04
#define GLV 0x08
+#define GTPE 0x0c
+#define GTNE 0x10
+#define GGPE 0x14
+#define GTS 0x1c

struct sch_gpio {
struct gpio_chip chip;
spinlock_t lock;
unsigned short iobase;
unsigned short resume_base;
+ int irq_base;
};

static unsigned sch_gpio_offset(struct sch_gpio *sch, unsigned gpio,
@@ -79,10 +84,11 @@ static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned gpio, unsigned reg,
static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
+ unsigned long flags;

- spin_lock(&sch->lock);
+ spin_lock_irqsave(&sch->lock, flags);
sch_gpio_reg_set(sch, gpio_num, GIO, 1);
- spin_unlock(&sch->lock);
+ spin_unlock_irqrestore(&sch->lock, flags);
return 0;
}

@@ -95,20 +101,22 @@ static int sch_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
+ unsigned long flags;

- spin_lock(&sch->lock);
+ spin_lock_irqsave(&sch->lock, flags);
sch_gpio_reg_set(sch, gpio_num, GLV, val);
- spin_unlock(&sch->lock);
+ spin_unlock_irqrestore(&sch->lock, flags);
}

static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
int val)
{
struct sch_gpio *sch = gpiochip_get_data(gc);
+ unsigned long flags;

- spin_lock(&sch->lock);
+ spin_lock_irqsave(&sch->lock, flags);
sch_gpio_reg_set(sch, gpio_num, GIO, 0);
- spin_unlock(&sch->lock);
+ spin_unlock_irqrestore(&sch->lock, flags);

/*
* according to the datasheet, writing to the level register has no
@@ -130,6 +138,12 @@ static int sch_gpio_get_direction(struct gpio_chip *gc, unsigned gpio_num)
return sch_gpio_reg_get(sch, gpio_num, GIO);
}

+static int sch_gpio_to_irq(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct sch_gpio *sch = gpiochip_get_data(gpio);
+ return sch->irq_base + offset;
+}
+
static const struct gpio_chip sch_gpio_chip = {
.label = "sch_gpio",
.owner = THIS_MODULE,
@@ -138,12 +152,94 @@ static const struct gpio_chip sch_gpio_chip = {
.direction_output = sch_gpio_direction_out,
.set = sch_gpio_set,
.get_direction = sch_gpio_get_direction,
+ .to_irq = sch_gpio_to_irq,
};

+static u32 sch_sci_handler(void *context)
+{
+ struct sch_gpio *sch = context;
+ unsigned long core_status, resume_status;
+ unsigned int resume_gpios, offset;
+
+ core_status = inl(sch->iobase + GTS);
+ resume_status = inl(sch->iobase + GTS + 0x20);
+
+ if (core_status == 0 && resume_status == 0)
+ return ACPI_INTERRUPT_NOT_HANDLED;
+
+ for_each_set_bit(offset, &core_status, sch->resume_base)
+ generic_handle_irq(sch->irq_base + offset);
+
+ resume_gpios = sch->chip.ngpio - sch->resume_base;
+ for_each_set_bit(offset, &resume_status, resume_gpios)
+ generic_handle_irq(sch->irq_base + sch->resume_base + offset);
+
+ outl(core_status, sch->iobase + GTS);
+ outl(resume_status, sch->iobase + GTS + 0x20);
+
+ return ACPI_INTERRUPT_HANDLED;
+}
+
+static int sch_irq_type(struct irq_data *d, unsigned int type)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct sch_gpio *sch = gc->private;
+ unsigned int gpio_num = d->irq - sch->irq_base;
+ int rising = 0;
+ int falling = 0;
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_RISING:
+ rising = 1;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ falling = 1;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ rising = 1;
+ falling = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock(&sch->lock);
+ sch_gpio_reg_set(sch, gpio_num, GTPE, rising);
+ sch_gpio_reg_set(sch, gpio_num, GTNE, falling);
+ spin_unlock(&sch->lock);
+
+ return 0;
+}
+
+static void sch_irq_set_enable(struct irq_data *d, int val)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct sch_gpio *sch = gc->private;
+ unsigned int gpio_num = d->irq - sch->irq_base;
+
+ spin_lock(&sch->lock);
+ sch_gpio_reg_set(sch, gpio_num, GGPE, val);
+ spin_unlock(&sch->lock);
+}
+
+static void sch_irq_mask(struct irq_data *d)
+{
+ sch_irq_set_enable(d, 0);
+}
+
+static void sch_irq_unmask(struct irq_data *d)
+{
+ sch_irq_set_enable(d, 1);
+}
+
static int sch_gpio_probe(struct platform_device *pdev)
{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
struct sch_gpio *sch;
struct resource *res;
+ acpi_status status;
+ int irq_base, ret;

sch = devm_kzalloc(&pdev->dev, sizeof(*sch), GFP_KERNEL);
if (!sch)
@@ -203,7 +299,39 @@ static int sch_gpio_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, sch);

- return devm_gpiochip_add_data(&pdev->dev, &sch->chip, sch);
+ ret = devm_gpiochip_add_data(&pdev->dev, &sch->chip, sch);
+ if (ret)
+ return ret;
+
+ irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, sch->chip.ngpio,
+ NUMA_NO_NODE);
+ if (irq_base < 0)
+ return irq_base;
+ sch->irq_base = irq_base;
+
+ gc = devm_irq_alloc_generic_chip(&pdev->dev, "sch_gpio", 1, irq_base,
+ NULL, handle_simple_irq);
+ if (!gc)
+ return -ENOMEM;
+
+ gc->private = sch;
+ ct = gc->chip_types;
+
+ ct->chip.irq_mask = sch_irq_mask;
+ ct->chip.irq_unmask = sch_irq_unmask;
+ ct->chip.irq_set_type = sch_irq_type;
+
+ ret = devm_irq_setup_generic_chip(&pdev->dev, gc,
+ IRQ_MSK(sch->chip.ngpio),
+ 0, IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+ if (ret)
+ return ret;
+
+ status = acpi_install_sci_handler(sch_sci_handler, sch);
+ if (ACPI_FAILURE(status))
+ return -EINVAL;
+
+ return 0;
}

static struct platform_driver sch_gpio_driver = {
--
2.16.4
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