[PATCH v3 4/9] drivers: irqchip: add PDC irqdomain for wakeup capable GPIOs

[Lina Iyer <ilina@codeaurora.org>]

Introduce a new domain for wakeup capable GPIOs. The domain can be
requested using the bus token DOMAIN_BUS_WAKEUP. In the following
patches, we will specify PDC as the wakeup-parent for the TLMM GPIO
irqchip. Requesting a wakeup GPIO will setup the GPIO and the
corresponding PDC interrupt as its parent.

Co-developed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---
Changes in v3:
	- Remove PDC GPIO map data (moved to DT)
	- hwirq passed in .alloc() is a PDC pin now
Changes in v2:
	- Remove separate file for PDC GPIO map data
	- Error checks and return
	- Whitespace fixes
---
 drivers/irqchip/qcom-pdc.c   | 106 ++++++++++++++++++++++++++++++++---
 include/linux/soc/qcom/irq.h |  23 ++++++++
 2 files changed, 120 insertions(+), 9 deletions(-)
 create mode 100644 include/linux/soc/qcom/irq.h

diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
index faa7d61b9d6c..5a64cbeec410 100644
--- a/drivers/irqchip/qcom-pdc.c
+++ b/drivers/irqchip/qcom-pdc.c
@@ -13,12 +13,13 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/soc/qcom/irq.h>
 #include <linux/spinlock.h>
-#include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 
 #define PDC_MAX_IRQS		126
+#define PDC_MAX_GPIO_IRQS	256
 
 #define CLEAR_INTR(reg, intr)	(reg & ~(1 << intr))
 #define ENABLE_INTR(reg, intr)	(reg | (1 << intr))
@@ -32,6 +33,16 @@ struct pdc_pin_region {
 	u32 cnt;
 };
 
+struct pdc_gpio_pin_map {
+	unsigned int gpio;
+	u32 pdc_pin;
+};
+
+struct pdc_gpio_pin_data {
+	size_t size;
+	const struct pdc_gpio_pin_map *map;
+};
+
 static DEFINE_RAW_SPINLOCK(pdc_lock);
 static void __iomem *pdc_base;
 static struct pdc_pin_region *pdc_region;
@@ -47,9 +58,8 @@ static u32 pdc_reg_read(int reg, u32 i)
 	return readl_relaxed(pdc_base + reg + i * sizeof(u32));
 }
 
-static void pdc_enable_intr(struct irq_data *d, bool on)
+static void pdc_enable_intr(irq_hw_number_t pin_out, bool on)
 {
-	int pin_out = d->hwirq;
 	u32 index, mask;
 	u32 enable;
 
@@ -65,13 +75,23 @@ static void pdc_enable_intr(struct irq_data *d, bool on)
 
 static void qcom_pdc_gic_mask(struct irq_data *d)
 {
-	pdc_enable_intr(d, false);
+	irq_hw_number_t hwirq = d->hwirq;
+
+	if (hwirq == ULONG_MAX)
+		return;
+
+	pdc_enable_intr(hwirq, false);
 	irq_chip_mask_parent(d);
 }
 
 static void qcom_pdc_gic_unmask(struct irq_data *d)
 {
-	pdc_enable_intr(d, true);
+	irq_hw_number_t hwirq = d->hwirq;
+
+	if (hwirq == ULONG_MAX)
+		return;
+
+	pdc_enable_intr(hwirq, true);
 	irq_chip_unmask_parent(d);
 }
 
@@ -111,9 +131,12 @@ enum pdc_irq_config_bits {
  */
 static int qcom_pdc_gic_set_type(struct irq_data *d, unsigned int type)
 {
-	int pin_out = d->hwirq;
+	irq_hw_number_t pin_out = d->hwirq;
 	enum pdc_irq_config_bits pdc_type;
 
+	if (pin_out == ULONG_MAX)
+		return 0;
+
 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		pdc_type = PDC_EDGE_RISING;
@@ -157,7 +180,7 @@ static struct irq_chip qcom_pdc_gic_chip = {
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 };
 
-static irq_hw_number_t get_parent_hwirq(int pin)
+static irq_hw_number_t get_parent_hwirq(irq_hw_number_t pin)
 {
 	int i;
 	struct pdc_pin_region *region;
@@ -169,7 +192,6 @@ static irq_hw_number_t get_parent_hwirq(int pin)
 			return (region->parent_base + pin - region->pin_base);
 	}
 
-	WARN_ON(1);
 	return ~0UL;
 }
 
@@ -232,6 +254,60 @@ static const struct irq_domain_ops qcom_pdc_ops = {
 	.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 qcom_irq_fwspec *qcom_fwspec = data;
+	struct irq_fwspec *fwspec = &qcom_fwspec->fwspec;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq, parent_hwirq;
+	unsigned int type;
+	int ret;
+
+	ret = qcom_pdc_translate(domain, fwspec, &hwirq, &type);
+	if (ret)
+		return -EINVAL;
+
+	parent_hwirq = get_parent_hwirq(hwirq);
+	if (parent_hwirq == ~0UL)
+		return -EINVAL;
+
+	ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+					    &qcom_pdc_gic_chip, NULL);
+	if (ret)
+		return ret;
+
+	qcom_fwspec->mask = true;
+
+	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]    = parent_hwirq;
+	parent_fwspec.param[2]    = type;
+
+	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
+					    &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,
+	.free		= irq_domain_free_irqs_common,
+};
+
 static int pdc_setup_pin_mapping(struct device_node *np)
 {
 	int ret, n;
@@ -270,7 +346,7 @@ 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;
+	struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
 	int ret;
 
 	pdc_base = of_iomap(node, 0);
@@ -301,6 +377,18 @@ static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
 		goto fail;
 	}
 
+	pdc_gpio_domain = irq_domain_create_hierarchy(parent_domain, 0,
+						      PDC_MAX_GPIO_IRQS,
+						      of_fwnode_handle(node),
+						      &qcom_pdc_gpio_ops, NULL);
+	if (!pdc_gpio_domain) {
+		pr_err("%pOF: GIC domain add failed for GPIO domain\n", node);
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	irq_domain_update_bus_token(pdc_gpio_domain, DOMAIN_BUS_WAKEUP);
+
 	return 0;
 
 fail:
diff --git a/include/linux/soc/qcom/irq.h b/include/linux/soc/qcom/irq.h
new file mode 100644
index 000000000000..bacc9edbce0d
--- /dev/null
+++ b/include/linux/soc/qcom/irq.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __QCOM_IRQ_H
+#define __QCOM_IRQ_H
+
+#include <linux/irqdomain.h>
+
+/**
+ * struct qcom_irq_fwspec - qcom specific irq fwspec wrapper
+ * @fwspec: irq fwspec
+ * @mask: if true, keep the irq masked in the gpio controller
+ *
+ * Use this structure to communicate between the parent irq chip, MPM or PDC,
+ * to the gpio chip, TLMM, about the gpio being allocated in the parent
+ * and if the gpio chip should keep the line masked because the parent irq
+ * chip is handling everything about the irq line.
+ */
+struct qcom_irq_fwspec {
+	struct irq_fwspec fwspec;
+	bool mask;
+};
+
+#endif
-- 
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