v4.19.13 snapshot.
diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c
new file mode 100644
index 0000000..90aaf19
--- /dev/null
+++ b/drivers/irqchip/irq-mtk-sysirq.c
@@ -0,0 +1,242 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Joe.C <yingjoe.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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 {
+ 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;
+
+ 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);
+ 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,
+};
+
+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;
+ }
+ 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);