1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mst-intc.c b/drivers/irqchip/irq-mst-intc.c
new file mode 100644
index 000000000000..f6133ae28155
--- /dev/null
+++ b/drivers/irqchip/irq-mst-intc.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+/*
+ * Copyright (c) 2020 MediaTek Inc.
+ * Author Mark-PK Tsai <mark-pk.tsai@mediatek.com>
+ */
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/syscore_ops.h>
+
+#define MST_INTC_MAX_IRQS	64
+
+#define INTC_MASK		0x0
+#define INTC_REV_POLARITY	0x10
+#define INTC_EOI		0x20
+
+#ifdef CONFIG_PM_SLEEP
+static LIST_HEAD(mst_intc_list);
+#endif
+
+struct mst_intc_chip_data {
+	raw_spinlock_t	lock;
+	unsigned int	irq_start, nr_irqs;
+	void __iomem	*base;
+	bool		no_eoi;
+#ifdef CONFIG_PM_SLEEP
+	struct list_head entry;
+	u16 saved_polarity_conf[DIV_ROUND_UP(MST_INTC_MAX_IRQS, 16)];
+#endif
+};
+
+static void mst_set_irq(struct irq_data *d, u32 offset)
+{
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+	struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
+	u16 val, mask;
+	unsigned long flags;
+
+	mask = 1 << (hwirq % 16);
+	offset += (hwirq / 16) * 4;
+
+	raw_spin_lock_irqsave(&cd->lock, flags);
+	val = readw_relaxed(cd->base + offset) | mask;
+	writew_relaxed(val, cd->base + offset);
+	raw_spin_unlock_irqrestore(&cd->lock, flags);
+}
+
+static void mst_clear_irq(struct irq_data *d, u32 offset)
+{
+	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+	struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
+	u16 val, mask;
+	unsigned long flags;
+
+	mask = 1 << (hwirq % 16);
+	offset += (hwirq / 16) * 4;
+
+	raw_spin_lock_irqsave(&cd->lock, flags);
+	val = readw_relaxed(cd->base + offset) & ~mask;
+	writew_relaxed(val, cd->base + offset);
+	raw_spin_unlock_irqrestore(&cd->lock, flags);
+}
+
+static void mst_intc_mask_irq(struct irq_data *d)
+{
+	mst_set_irq(d, INTC_MASK);
+	irq_chip_mask_parent(d);
+}
+
+static void mst_intc_unmask_irq(struct irq_data *d)
+{
+	mst_clear_irq(d, INTC_MASK);
+	irq_chip_unmask_parent(d);
+}
+
+static void mst_intc_eoi_irq(struct irq_data *d)
+{
+	struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
+
+	if (!cd->no_eoi)
+		mst_set_irq(d, INTC_EOI);
+
+	irq_chip_eoi_parent(d);
+}
+
+static int mst_irq_chip_set_type(struct irq_data *data, unsigned int type)
+{
+	switch (type) {
+	case IRQ_TYPE_LEVEL_LOW:
+	case IRQ_TYPE_EDGE_FALLING:
+		mst_set_irq(data, INTC_REV_POLARITY);
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_EDGE_RISING:
+		mst_clear_irq(data, INTC_REV_POLARITY);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return irq_chip_set_type_parent(data, IRQ_TYPE_LEVEL_HIGH);
+}
+
+static struct irq_chip mst_intc_chip = {
+	.name			= "mst-intc",
+	.irq_mask		= mst_intc_mask_irq,
+	.irq_unmask		= mst_intc_unmask_irq,
+	.irq_eoi		= mst_intc_eoi_irq,
+	.irq_get_irqchip_state	= irq_chip_get_parent_state,
+	.irq_set_irqchip_state	= irq_chip_set_parent_state,
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+	.irq_set_vcpu_affinity	= irq_chip_set_vcpu_affinity_parent,
+	.irq_set_type		= mst_irq_chip_set_type,
+	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.flags			= IRQCHIP_SET_TYPE_MASKED |
+				  IRQCHIP_SKIP_SET_WAKE |
+				  IRQCHIP_MASK_ON_SUSPEND,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static void mst_intc_polarity_save(struct mst_intc_chip_data *cd)
+{
+	int i;
+	void __iomem *addr = cd->base + INTC_REV_POLARITY;
+
+	for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
+		cd->saved_polarity_conf[i] = readw_relaxed(addr + i * 4);
+}
+
+static void mst_intc_polarity_restore(struct mst_intc_chip_data *cd)
+{
+	int i;
+	void __iomem *addr = cd->base + INTC_REV_POLARITY;
+
+	for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
+		writew_relaxed(cd->saved_polarity_conf[i], addr + i * 4);
+}
+
+static void mst_irq_resume(void)
+{
+	struct mst_intc_chip_data *cd;
+
+	list_for_each_entry(cd, &mst_intc_list, entry)
+		mst_intc_polarity_restore(cd);
+}
+
+static int mst_irq_suspend(void)
+{
+	struct mst_intc_chip_data *cd;
+
+	list_for_each_entry(cd, &mst_intc_list, entry)
+		mst_intc_polarity_save(cd);
+	return 0;
+}
+
+static struct syscore_ops mst_irq_syscore_ops = {
+	.suspend	= mst_irq_suspend,
+	.resume		= mst_irq_resume,
+};
+
+static int __init mst_irq_pm_init(void)
+{
+	register_syscore_ops(&mst_irq_syscore_ops);
+	return 0;
+}
+late_initcall(mst_irq_pm_init);
+#endif
+
+static int mst_intc_domain_translate(struct irq_domain *d,
+				     struct irq_fwspec *fwspec,
+				     unsigned long *hwirq,
+				     unsigned int *type)
+{
+	struct mst_intc_chip_data *cd = d->host_data;
+
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 3)
+			return -EINVAL;
+
+		/* No PPI should point to this domain */
+		if (fwspec->param[0] != 0)
+			return -EINVAL;
+
+		if (fwspec->param[1] >= cd->nr_irqs)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[1];
+		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int mst_intc_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				 unsigned int nr_irqs, void *data)
+{
+	int i;
+	irq_hw_number_t hwirq;
+	struct irq_fwspec parent_fwspec, *fwspec = data;
+	struct mst_intc_chip_data *cd = domain->host_data;
+
+	/* Not GIC compliant */
+	if (fwspec->param_count != 3)
+		return -EINVAL;
+
+	/* No PPI should point to this domain */
+	if (fwspec->param[0])
+		return -EINVAL;
+
+	hwirq = fwspec->param[1];
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+					      &mst_intc_chip,
+					      domain->host_data);
+
+	parent_fwspec = *fwspec;
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param[1] = cd->irq_start + hwirq;
+
+	/*
+	 * mst-intc latch the interrupt request if it's edge triggered,
+	 * so the output signal to parent GIC is always level sensitive.
+	 * And if the irq signal is active low, configure it to active high
+	 * to meet GIC SPI spec in mst_irq_chip_set_type via REV_POLARITY bit.
+	 */
+	parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
+
+	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_fwspec);
+}
+
+static const struct irq_domain_ops mst_intc_domain_ops = {
+	.translate	= mst_intc_domain_translate,
+	.alloc		= mst_intc_domain_alloc,
+	.free		= irq_domain_free_irqs_common,
+};
+
+static int __init mst_intc_of_init(struct device_node *dn,
+				   struct device_node *parent)
+{
+	struct irq_domain *domain, *domain_parent;
+	struct mst_intc_chip_data *cd;
+	u32 irq_start, irq_end;
+
+	domain_parent = irq_find_host(parent);
+	if (!domain_parent) {
+		pr_err("mst-intc: interrupt-parent not found\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32_index(dn, "mstar,irqs-map-range", 0, &irq_start) ||
+	    of_property_read_u32_index(dn, "mstar,irqs-map-range", 1, &irq_end))
+		return -EINVAL;
+
+	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
+	if (!cd)
+		return -ENOMEM;
+
+	cd->base = of_iomap(dn, 0);
+	if (!cd->base) {
+		kfree(cd);
+		return -ENOMEM;
+	}
+
+	cd->no_eoi = of_property_read_bool(dn, "mstar,intc-no-eoi");
+	raw_spin_lock_init(&cd->lock);
+	cd->irq_start = irq_start;
+	cd->nr_irqs = irq_end - irq_start + 1;
+	domain = irq_domain_add_hierarchy(domain_parent, 0, cd->nr_irqs, dn,
+					  &mst_intc_domain_ops, cd);
+	if (!domain) {
+		iounmap(cd->base);
+		kfree(cd);
+		return -ENOMEM;
+	}
+
+#ifdef CONFIG_PM_SLEEP
+	INIT_LIST_HEAD(&cd->entry);
+	list_add_tail(&cd->entry, &mst_intc_list);
+#endif
+	return 0;
+}
+
+IRQCHIP_DECLARE(mst_intc, "mstar,mst-intc", mst_intc_of_init);