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ea4aeaa5c8
Support irq polarity configuration and save and restore the config when system suspend and resume. Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> [maz: fixed irq_set_type callback] Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210315131848.31840-1-mark-pk.tsai@mediatek.com
292 lines
7.1 KiB
C
292 lines
7.1 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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/*
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* Copyright (c) 2020 MediaTek Inc.
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* Author Mark-PK Tsai <mark-pk.tsai@mediatek.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/syscore_ops.h>
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#define MST_INTC_MAX_IRQS 64
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#define INTC_MASK 0x0
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#define INTC_REV_POLARITY 0x10
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#define INTC_EOI 0x20
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#ifdef CONFIG_PM_SLEEP
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static LIST_HEAD(mst_intc_list);
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#endif
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struct mst_intc_chip_data {
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raw_spinlock_t lock;
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unsigned int irq_start, nr_irqs;
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void __iomem *base;
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bool no_eoi;
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#ifdef CONFIG_PM_SLEEP
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struct list_head entry;
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u16 saved_polarity_conf[DIV_ROUND_UP(MST_INTC_MAX_IRQS, 16)];
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#endif
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};
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static void mst_set_irq(struct irq_data *d, u32 offset)
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{
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irq_hw_number_t hwirq = irqd_to_hwirq(d);
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struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
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u16 val, mask;
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unsigned long flags;
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mask = 1 << (hwirq % 16);
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offset += (hwirq / 16) * 4;
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raw_spin_lock_irqsave(&cd->lock, flags);
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val = readw_relaxed(cd->base + offset) | mask;
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writew_relaxed(val, cd->base + offset);
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raw_spin_unlock_irqrestore(&cd->lock, flags);
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}
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static void mst_clear_irq(struct irq_data *d, u32 offset)
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{
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irq_hw_number_t hwirq = irqd_to_hwirq(d);
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struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
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u16 val, mask;
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unsigned long flags;
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mask = 1 << (hwirq % 16);
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offset += (hwirq / 16) * 4;
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raw_spin_lock_irqsave(&cd->lock, flags);
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val = readw_relaxed(cd->base + offset) & ~mask;
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writew_relaxed(val, cd->base + offset);
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raw_spin_unlock_irqrestore(&cd->lock, flags);
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}
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static void mst_intc_mask_irq(struct irq_data *d)
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{
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mst_set_irq(d, INTC_MASK);
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irq_chip_mask_parent(d);
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}
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static void mst_intc_unmask_irq(struct irq_data *d)
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{
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mst_clear_irq(d, INTC_MASK);
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irq_chip_unmask_parent(d);
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}
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static void mst_intc_eoi_irq(struct irq_data *d)
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{
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struct mst_intc_chip_data *cd = irq_data_get_irq_chip_data(d);
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if (!cd->no_eoi)
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mst_set_irq(d, INTC_EOI);
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irq_chip_eoi_parent(d);
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}
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static int mst_irq_chip_set_type(struct irq_data *data, unsigned int type)
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{
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switch (type) {
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case IRQ_TYPE_LEVEL_LOW:
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case IRQ_TYPE_EDGE_FALLING:
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mst_set_irq(data, INTC_REV_POLARITY);
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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case IRQ_TYPE_EDGE_RISING:
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mst_clear_irq(data, INTC_REV_POLARITY);
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break;
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default:
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return -EINVAL;
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}
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return irq_chip_set_type_parent(data, IRQ_TYPE_LEVEL_HIGH);
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}
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static struct irq_chip mst_intc_chip = {
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.name = "mst-intc",
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.irq_mask = mst_intc_mask_irq,
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.irq_unmask = mst_intc_unmask_irq,
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.irq_eoi = mst_intc_eoi_irq,
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.irq_get_irqchip_state = irq_chip_get_parent_state,
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.irq_set_irqchip_state = irq_chip_set_parent_state,
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.irq_set_affinity = irq_chip_set_affinity_parent,
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.irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
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.irq_set_type = mst_irq_chip_set_type,
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.irq_retrigger = irq_chip_retrigger_hierarchy,
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.flags = IRQCHIP_SET_TYPE_MASKED |
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IRQCHIP_SKIP_SET_WAKE |
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IRQCHIP_MASK_ON_SUSPEND,
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};
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#ifdef CONFIG_PM_SLEEP
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static void mst_intc_polarity_save(struct mst_intc_chip_data *cd)
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{
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int i;
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void __iomem *addr = cd->base + INTC_REV_POLARITY;
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for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
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cd->saved_polarity_conf[i] = readw_relaxed(addr + i * 4);
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}
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static void mst_intc_polarity_restore(struct mst_intc_chip_data *cd)
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{
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int i;
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void __iomem *addr = cd->base + INTC_REV_POLARITY;
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for (i = 0; i < DIV_ROUND_UP(cd->nr_irqs, 16); i++)
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writew_relaxed(cd->saved_polarity_conf[i], addr + i * 4);
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}
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static void mst_irq_resume(void)
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{
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struct mst_intc_chip_data *cd;
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list_for_each_entry(cd, &mst_intc_list, entry)
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mst_intc_polarity_restore(cd);
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}
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static int mst_irq_suspend(void)
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{
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struct mst_intc_chip_data *cd;
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list_for_each_entry(cd, &mst_intc_list, entry)
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mst_intc_polarity_save(cd);
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return 0;
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}
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static struct syscore_ops mst_irq_syscore_ops = {
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.suspend = mst_irq_suspend,
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.resume = mst_irq_resume,
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};
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static int __init mst_irq_pm_init(void)
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{
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register_syscore_ops(&mst_irq_syscore_ops);
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return 0;
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}
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late_initcall(mst_irq_pm_init);
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#endif
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static int mst_intc_domain_translate(struct irq_domain *d,
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struct irq_fwspec *fwspec,
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unsigned long *hwirq,
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unsigned int *type)
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{
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struct mst_intc_chip_data *cd = d->host_data;
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if (is_of_node(fwspec->fwnode)) {
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if (fwspec->param_count != 3)
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return -EINVAL;
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/* No PPI should point to this domain */
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if (fwspec->param[0] != 0)
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return -EINVAL;
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if (fwspec->param[1] >= cd->nr_irqs)
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return -EINVAL;
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*hwirq = fwspec->param[1];
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*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
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return 0;
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}
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return -EINVAL;
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}
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static int mst_intc_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *data)
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{
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int i;
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irq_hw_number_t hwirq;
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struct irq_fwspec parent_fwspec, *fwspec = data;
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struct mst_intc_chip_data *cd = domain->host_data;
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/* Not GIC compliant */
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if (fwspec->param_count != 3)
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return -EINVAL;
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/* No PPI should point to this domain */
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if (fwspec->param[0])
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return -EINVAL;
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hwirq = fwspec->param[1];
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for (i = 0; i < nr_irqs; i++)
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irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
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&mst_intc_chip,
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domain->host_data);
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parent_fwspec = *fwspec;
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parent_fwspec.fwnode = domain->parent->fwnode;
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parent_fwspec.param[1] = cd->irq_start + hwirq;
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/*
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* mst-intc latch the interrupt request if it's edge triggered,
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* so the output signal to parent GIC is always level sensitive.
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* And if the irq signal is active low, configure it to active high
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* to meet GIC SPI spec in mst_irq_chip_set_type via REV_POLARITY bit.
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*/
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parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
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return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_fwspec);
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}
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static const struct irq_domain_ops mst_intc_domain_ops = {
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.translate = mst_intc_domain_translate,
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.alloc = mst_intc_domain_alloc,
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.free = irq_domain_free_irqs_common,
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};
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static int __init mst_intc_of_init(struct device_node *dn,
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struct device_node *parent)
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{
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struct irq_domain *domain, *domain_parent;
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struct mst_intc_chip_data *cd;
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u32 irq_start, irq_end;
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domain_parent = irq_find_host(parent);
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if (!domain_parent) {
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pr_err("mst-intc: interrupt-parent not found\n");
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return -EINVAL;
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}
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if (of_property_read_u32_index(dn, "mstar,irqs-map-range", 0, &irq_start) ||
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of_property_read_u32_index(dn, "mstar,irqs-map-range", 1, &irq_end))
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return -EINVAL;
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cd = kzalloc(sizeof(*cd), GFP_KERNEL);
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if (!cd)
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return -ENOMEM;
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cd->base = of_iomap(dn, 0);
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if (!cd->base) {
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kfree(cd);
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return -ENOMEM;
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}
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cd->no_eoi = of_property_read_bool(dn, "mstar,intc-no-eoi");
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raw_spin_lock_init(&cd->lock);
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cd->irq_start = irq_start;
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cd->nr_irqs = irq_end - irq_start + 1;
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domain = irq_domain_add_hierarchy(domain_parent, 0, cd->nr_irqs, dn,
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&mst_intc_domain_ops, cd);
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if (!domain) {
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iounmap(cd->base);
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kfree(cd);
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return -ENOMEM;
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}
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#ifdef CONFIG_PM_SLEEP
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INIT_LIST_HEAD(&cd->entry);
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list_add_tail(&cd->entry, &mst_intc_list);
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#endif
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return 0;
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}
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IRQCHIP_DECLARE(mst_intc, "mstar,mst-intc", mst_intc_of_init);
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