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path: root/drivers/irqchip/irq-renesas-intc-irqpin.c
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Diffstat (limited to 'drivers/irqchip/irq-renesas-intc-irqpin.c')
-rw-r--r--drivers/irqchip/irq-renesas-intc-irqpin.c90
1 files changed, 83 insertions, 7 deletions
diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index fd5dabc2235d..5a68e5accec1 100644
--- a/drivers/irqchip/irq-renesas-intc-irqpin.c
+++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
@@ -74,6 +74,8 @@ struct intc_irqpin_priv {
struct platform_device *pdev;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
+ bool shared_irqs;
+ u8 shared_irq_mask;
};
static unsigned long intc_irqpin_read32(void __iomem *iomem)
@@ -193,6 +195,28 @@ static void intc_irqpin_irq_disable(struct irq_data *d)
intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
}
+static void intc_irqpin_shared_irq_enable(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int hw_irq = irqd_to_hwirq(d);
+
+ intc_irqpin_dbg(&p->irq[hw_irq], "shared enable");
+ intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
+
+ p->shared_irq_mask &= ~BIT(hw_irq);
+}
+
+static void intc_irqpin_shared_irq_disable(struct irq_data *d)
+{
+ struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
+ int hw_irq = irqd_to_hwirq(d);
+
+ intc_irqpin_dbg(&p->irq[hw_irq], "shared disable");
+ intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
+
+ p->shared_irq_mask |= BIT(hw_irq);
+}
+
static void intc_irqpin_irq_enable_force(struct irq_data *d)
{
struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
@@ -261,6 +285,25 @@ static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
return IRQ_NONE;
}
+static irqreturn_t intc_irqpin_shared_irq_handler(int irq, void *dev_id)
+{
+ struct intc_irqpin_priv *p = dev_id;
+ unsigned int reg_source = intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE);
+ irqreturn_t status = IRQ_NONE;
+ int k;
+
+ for (k = 0; k < 8; k++) {
+ if (reg_source & BIT(7 - k)) {
+ if (BIT(k) & p->shared_irq_mask)
+ continue;
+
+ status |= intc_irqpin_irq_handler(irq, &p->irq[k]);
+ }
+ }
+
+ return status;
+}
+
static int intc_irqpin_irq_domain_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
@@ -292,6 +335,7 @@ static int intc_irqpin_probe(struct platform_device *pdev)
void (*enable_fn)(struct irq_data *d);
void (*disable_fn)(struct irq_data *d);
const char *name = dev_name(&pdev->dev);
+ int ref_irq;
int ret;
int k;
@@ -372,13 +416,29 @@ static int intc_irqpin_probe(struct platform_device *pdev)
for (k = 0; k < p->number_of_irqs; k++)
intc_irqpin_mask_unmask_prio(p, k, 1);
+ /* clear all pending interrupts */
+ intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, 0x0);
+
+ /* scan for shared interrupt lines */
+ ref_irq = p->irq[0].requested_irq;
+ p->shared_irqs = true;
+ for (k = 1; k < p->number_of_irqs; k++) {
+ if (ref_irq != p->irq[k].requested_irq) {
+ p->shared_irqs = false;
+ break;
+ }
+ }
+
/* use more severe masking method if requested */
if (p->config.control_parent) {
enable_fn = intc_irqpin_irq_enable_force;
disable_fn = intc_irqpin_irq_disable_force;
- } else {
+ } else if (!p->shared_irqs) {
enable_fn = intc_irqpin_irq_enable;
disable_fn = intc_irqpin_irq_disable;
+ } else {
+ enable_fn = intc_irqpin_shared_irq_enable;
+ disable_fn = intc_irqpin_shared_irq_disable;
}
irq_chip = &p->irq_chip;
@@ -400,18 +460,34 @@ static int intc_irqpin_probe(struct platform_device *pdev)
goto err0;
}
- /* request and set priority on interrupts one by one */
- for (k = 0; k < p->number_of_irqs; k++) {
- if (devm_request_irq(&pdev->dev, p->irq[k].requested_irq,
- intc_irqpin_irq_handler,
- 0, name, &p->irq[k])) {
+ if (p->shared_irqs) {
+ /* request one shared interrupt */
+ if (devm_request_irq(&pdev->dev, p->irq[0].requested_irq,
+ intc_irqpin_shared_irq_handler,
+ IRQF_SHARED, name, p)) {
dev_err(&pdev->dev, "failed to request low IRQ\n");
ret = -ENOENT;
goto err1;
}
- intc_irqpin_mask_unmask_prio(p, k, 0);
+ } else {
+ /* request interrupts one by one */
+ for (k = 0; k < p->number_of_irqs; k++) {
+ if (devm_request_irq(&pdev->dev,
+ p->irq[k].requested_irq,
+ intc_irqpin_irq_handler,
+ 0, name, &p->irq[k])) {
+ dev_err(&pdev->dev,
+ "failed to request low IRQ\n");
+ ret = -ENOENT;
+ goto err1;
+ }
+ }
}
+ /* unmask all interrupts on prio level */
+ for (k = 0; k < p->number_of_irqs; k++)
+ intc_irqpin_mask_unmask_prio(p, k, 0);
+
dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
/* warn in case of mismatch if irq base is specified */