irqchip/qcom-pdc: Kill non-wakeup irqdomain

A careful look at the way the PDC driver works shows that:

- all interrupts are in the same space
- all interrupts are treated the same

And yet the driver creates two domains based on whether
the interrupt gets mapped directly or from the pinctrl code,
which is obviously a waste of resources.

Kill the non-wakeup domain and unify all the interrupt handling.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220224101226.88373-3-maz@kernel.org

Author: Marc Zyngier

drivers/irqchip/qcom-pdc.c

@@ -21,7 +21,6 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 
-#define PDC_MAX_IRQS		168
 #define PDC_MAX_GPIO_IRQS	256
 
 #define CLEAR_INTR(reg, intr)	(reg & ~(1 << intr))
@@ -224,51 +223,6 @@ static int qcom_pdc_alloc(struct irq_domain *domain, unsigned int virq,
 	unsigned int type;
 	int ret;
 
-	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
-	if (ret)
-		return ret;
-
-	ret  = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
-					     &qcom_pdc_gic_chip, NULL);
-	if (ret)
-		return ret;
-
-	region = get_pin_region(hwirq);
-	if (!region)
-		return irq_domain_disconnect_hierarchy(domain->parent, virq);
-
-	if (type & IRQ_TYPE_EDGE_BOTH)
-		type = IRQ_TYPE_EDGE_RISING;
-
-	if (type & IRQ_TYPE_LEVEL_MASK)
-		type = IRQ_TYPE_LEVEL_HIGH;
-
-	parent_fwspec.fwnode      = domain->parent->fwnode;
-	parent_fwspec.param_count = 3;
-	parent_fwspec.param[0]    = 0;
-	parent_fwspec.param[1]    = pin_to_hwirq(region, hwirq);
-	parent_fwspec.param[2]    = type;
-
-	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
-					    &parent_fwspec);
-}
-
-static const struct irq_domain_ops qcom_pdc_ops = {
-	.translate	= qcom_pdc_translate,
-	.alloc		= qcom_pdc_alloc,
-	.free		= irq_domain_free_irqs_common,
-};
-
-static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
-			       unsigned int nr_irqs, void *data)
-{
-	struct irq_fwspec *fwspec = data;
-	struct irq_fwspec parent_fwspec;
-	struct pdc_pin_region *region;
-	irq_hw_number_t hwirq;
-	unsigned int type;
-	int ret;
-
 	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
 	if (ret)
 		return ret;
@@ -301,16 +255,9 @@ static int qcom_pdc_gpio_alloc(struct irq_domain *domain, unsigned int virq,
 					    &parent_fwspec);
 }
 
-static int qcom_pdc_gpio_domain_select(struct irq_domain *d,
-				       struct irq_fwspec *fwspec,
-				       enum irq_domain_bus_token bus_token)
-{
-	return bus_token == DOMAIN_BUS_WAKEUP;
-}
-
-static const struct irq_domain_ops qcom_pdc_gpio_ops = {
-	.select		= qcom_pdc_gpio_domain_select,
-	.alloc		= qcom_pdc_gpio_alloc,
+static const struct irq_domain_ops qcom_pdc_ops = {
+	.translate	= qcom_pdc_translate,
+	.alloc		= qcom_pdc_alloc,
 	.free		= irq_domain_free_irqs_common,
 };
 
@@ -361,7 +308,7 @@ static int pdc_setup_pin_mapping(struct device_node *np)
 
 static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
 {
-	struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
+	struct irq_domain *parent_domain, *pdc_domain;
 	int ret;
 
 	pdc_base = of_iomap(node, 0);
@@ -383,32 +330,21 @@ static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
 		goto fail;
 	}
 
-	pdc_domain = irq_domain_create_hierarchy(parent_domain, 0, PDC_MAX_IRQS,
-						 of_fwnode_handle(node),
-						 &qcom_pdc_ops, NULL);
-	if (!pdc_domain) {
-		pr_err("%pOF: GIC domain add failed\n", node);
-		ret = -ENOMEM;
-		goto fail;
-	}
-
-	pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain,
+	pdc_domain = irq_domain_create_hierarchy(parent_domain,
 					IRQ_DOMAIN_FLAG_QCOM_PDC_WAKEUP,
 					PDC_MAX_GPIO_IRQS,
 					of_fwnode_handle(node),
-					&qcom_pdc_gpio_ops, NULL);
-	if (!pdc_gpio_domain) {
-		pr_err("%pOF: PDC domain add failed for GPIO domain\n", node);
+					&qcom_pdc_ops, NULL);
+	if (!pdc_domain) {
+		pr_err("%pOF: PDC domain add failed\n", node);
 		ret = -ENOMEM;
-		goto remove;
+		goto fail;
 	}
 
-	irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);
+	irq_domain_update_bus_token(pdc_domain, DOMAIN_BUS_WAKEUP);
 
 	return 0;
 
-remove:
-	irq_domain_remove(pdc_domain);
 fail:
 	kfree(pdc_region);
 	iounmap(pdc_base);