Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 235 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c
new file mode 100644
index 000000000..586e52d54
--- /dev/null
+++ b/drivers/irqchip/irq-mtk-sysirq.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Joe.C <yingjoe.chen@mediatek.com>
+ */
+
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+struct mtk_sysirq_chip_data {
+	raw_spinlock_t lock;
+	u32 nr_intpol_bases;
+	void __iomem **intpol_bases;
+	u32 *intpol_words;
+	u8 *intpol_idx;
+	u16 *which_word;
+};
+
+static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
+{
+	irq_hw_number_t hwirq = data->hwirq;
+	struct mtk_sysirq_chip_data *chip_data = data->chip_data;
+	u8 intpol_idx = chip_data->intpol_idx[hwirq];
+	void __iomem *base;
+	u32 offset, reg_index, value;
+	unsigned long flags;
+	int ret;
+
+	base = chip_data->intpol_bases[intpol_idx];
+	reg_index = chip_data->which_word[hwirq];
+	offset = hwirq & 0x1f;
+
+	raw_spin_lock_irqsave(&chip_data->lock, flags);
+	value = readl_relaxed(base + reg_index * 4);
+	if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
+		if (type == IRQ_TYPE_LEVEL_LOW)
+			type = IRQ_TYPE_LEVEL_HIGH;
+		else
+			type = IRQ_TYPE_EDGE_RISING;
+		value |= (1 << offset);
+	} else {
+		value &= ~(1 << offset);
+	}
+
+	writel_relaxed(value, base + reg_index * 4);
+
+	data = data->parent_data;
+	ret = data->chip->irq_set_type(data, type);
+	raw_spin_unlock_irqrestore(&chip_data->lock, flags);
+	return ret;
+}
+
+static struct irq_chip mtk_sysirq_chip = {
+	.name			= "MT_SYSIRQ",
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_eoi		= irq_chip_eoi_parent,
+	.irq_set_type		= mtk_sysirq_set_type,
+	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+	.flags			= IRQCHIP_SKIP_SET_WAKE,
+};
+
+static int mtk_sysirq_domain_translate(struct irq_domain *d,
+				       struct irq_fwspec *fwspec,
+				       unsigned long *hwirq,
+				       unsigned int *type)
+{
+	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;
+
+		*hwirq = fwspec->param[1];
+		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				   unsigned int nr_irqs, void *arg)
+{
+	int i;
+	irq_hw_number_t hwirq;
+	struct irq_fwspec *fwspec = arg;
+	struct irq_fwspec gic_fwspec = *fwspec;
+
+	if (fwspec->param_count != 3)
+		return -EINVAL;
+
+	/* sysirq doesn't support PPI */
+	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,
+					      &mtk_sysirq_chip,
+					      domain->host_data);
+
+	gic_fwspec.fwnode = domain->parent->fwnode;
+	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
+}
+
+static const struct irq_domain_ops sysirq_domain_ops = {
+	.translate	= mtk_sysirq_domain_translate,
+	.alloc		= mtk_sysirq_domain_alloc,
+	.free		= irq_domain_free_irqs_common,
+};
+
+static int __init mtk_sysirq_of_init(struct device_node *node,
+				     struct device_node *parent)
+{
+	struct irq_domain *domain, *domain_parent;
+	struct mtk_sysirq_chip_data *chip_data;
+	int ret, size, intpol_num = 0, nr_intpol_bases = 0, i = 0;
+
+	domain_parent = irq_find_host(parent);
+	if (!domain_parent) {
+		pr_err("mtk_sysirq: interrupt-parent not found\n");
+		return -EINVAL;
+	}
+
+	chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
+	if (!chip_data)
+		return -ENOMEM;
+
+	while (of_get_address(node, i++, NULL, NULL))
+		nr_intpol_bases++;
+
+	if (nr_intpol_bases == 0) {
+		pr_err("mtk_sysirq: base address not specified\n");
+		ret = -EINVAL;
+		goto out_free_chip;
+	}
+
+	chip_data->intpol_words = kcalloc(nr_intpol_bases,
+					  sizeof(*chip_data->intpol_words),
+					  GFP_KERNEL);
+	if (!chip_data->intpol_words) {
+		ret = -ENOMEM;
+		goto out_free_chip;
+	}
+
+	chip_data->intpol_bases = kcalloc(nr_intpol_bases,
+					  sizeof(*chip_data->intpol_bases),
+					  GFP_KERNEL);
+	if (!chip_data->intpol_bases) {
+		ret = -ENOMEM;
+		goto out_free_intpol_words;
+	}
+
+	for (i = 0; i < nr_intpol_bases; i++) {
+		struct resource res;
+
+		ret = of_address_to_resource(node, i, &res);
+		size = resource_size(&res);
+		intpol_num += size * 8;
+		chip_data->intpol_words[i] = size / 4;
+		chip_data->intpol_bases[i] = of_iomap(node, i);
+		if (ret || !chip_data->intpol_bases[i]) {
+			pr_err("%pOF: couldn't map region %d\n", node, i);
+			ret = -ENODEV;
+			goto out_free_intpol;
+		}
+	}
+
+	chip_data->intpol_idx = kcalloc(intpol_num,
+					sizeof(*chip_data->intpol_idx),
+					GFP_KERNEL);
+	if (!chip_data->intpol_idx) {
+		ret = -ENOMEM;
+		goto out_free_intpol;
+	}
+
+	chip_data->which_word = kcalloc(intpol_num,
+					sizeof(*chip_data->which_word),
+					GFP_KERNEL);
+	if (!chip_data->which_word) {
+		ret = -ENOMEM;
+		goto out_free_intpol_idx;
+	}
+
+	/*
+	 * assign an index of the intpol_bases for each irq
+	 * to set it fast later
+	 */
+	for (i = 0; i < intpol_num ; i++) {
+		u32 word = i / 32, j;
+
+		for (j = 0; word >= chip_data->intpol_words[j] ; j++)
+			word -= chip_data->intpol_words[j];
+
+		chip_data->intpol_idx[i] = j;
+		chip_data->which_word[i] = word;
+	}
+
+	domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
+					  &sysirq_domain_ops, chip_data);
+	if (!domain) {
+		ret = -ENOMEM;
+		goto out_free_which_word;
+	}
+	raw_spin_lock_init(&chip_data->lock);
+
+	return 0;
+
+out_free_which_word:
+	kfree(chip_data->which_word);
+out_free_intpol_idx:
+	kfree(chip_data->intpol_idx);
+out_free_intpol:
+	for (i = 0; i < nr_intpol_bases; i++)
+		if (chip_data->intpol_bases[i])
+			iounmap(chip_data->intpol_bases[i]);
+	kfree(chip_data->intpol_bases);
+out_free_intpol_words:
+	kfree(chip_data->intpol_words);
+out_free_chip:
+	kfree(chip_data);
+	return ret;
+}
+IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);