forked from Minki/linux
8de50dc262
Uniformize STMicroelectronics copyrights header and add SPDX identifier CC: Maxime Coquelin <mcoquelin.stm32@gmail.com> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Alexandre TORGUE <alexandre.torgue@st.com> Acked-by: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: linux-arm-kernel@lists.infradead.org Link: https://lkml.kernel.org/r/20171130084500.23439-1-benjamin.gaignard@st.com
311 lines
7.6 KiB
C
311 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) Maxime Coquelin 2015
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* Copyright (C) STMicroelectronics 2017
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* Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
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*/
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#include <linux/bitops.h>
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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/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#define IRQS_PER_BANK 32
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struct stm32_exti_bank {
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u32 imr_ofst;
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u32 emr_ofst;
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u32 rtsr_ofst;
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u32 ftsr_ofst;
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u32 swier_ofst;
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u32 pr_ofst;
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};
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static const struct stm32_exti_bank stm32f4xx_exti_b1 = {
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.imr_ofst = 0x00,
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.emr_ofst = 0x04,
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.rtsr_ofst = 0x08,
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.ftsr_ofst = 0x0C,
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.swier_ofst = 0x10,
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.pr_ofst = 0x14,
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};
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static const struct stm32_exti_bank *stm32f4xx_exti_banks[] = {
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&stm32f4xx_exti_b1,
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};
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static const struct stm32_exti_bank stm32h7xx_exti_b1 = {
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.imr_ofst = 0x80,
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.emr_ofst = 0x84,
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.rtsr_ofst = 0x00,
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.ftsr_ofst = 0x04,
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.swier_ofst = 0x08,
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.pr_ofst = 0x88,
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};
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static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
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.imr_ofst = 0x90,
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.emr_ofst = 0x94,
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.rtsr_ofst = 0x20,
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.ftsr_ofst = 0x24,
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.swier_ofst = 0x28,
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.pr_ofst = 0x98,
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};
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static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
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.imr_ofst = 0xA0,
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.emr_ofst = 0xA4,
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.rtsr_ofst = 0x40,
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.ftsr_ofst = 0x44,
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.swier_ofst = 0x48,
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.pr_ofst = 0xA8,
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};
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static const struct stm32_exti_bank *stm32h7xx_exti_banks[] = {
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&stm32h7xx_exti_b1,
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&stm32h7xx_exti_b2,
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&stm32h7xx_exti_b3,
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};
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static unsigned long stm32_exti_pending(struct irq_chip_generic *gc)
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{
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const struct stm32_exti_bank *stm32_bank = gc->private;
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return irq_reg_readl(gc, stm32_bank->pr_ofst);
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}
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static void stm32_exti_irq_ack(struct irq_chip_generic *gc, u32 mask)
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{
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const struct stm32_exti_bank *stm32_bank = gc->private;
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irq_reg_writel(gc, mask, stm32_bank->pr_ofst);
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}
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static void stm32_irq_handler(struct irq_desc *desc)
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{
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struct irq_domain *domain = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned int virq, nbanks = domain->gc->num_chips;
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struct irq_chip_generic *gc;
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const struct stm32_exti_bank *stm32_bank;
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unsigned long pending;
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int n, i, irq_base = 0;
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chained_irq_enter(chip, desc);
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for (i = 0; i < nbanks; i++, irq_base += IRQS_PER_BANK) {
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gc = irq_get_domain_generic_chip(domain, irq_base);
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stm32_bank = gc->private;
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while ((pending = stm32_exti_pending(gc))) {
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for_each_set_bit(n, &pending, IRQS_PER_BANK) {
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virq = irq_find_mapping(domain, irq_base + n);
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generic_handle_irq(virq);
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stm32_exti_irq_ack(gc, BIT(n));
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}
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}
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}
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chained_irq_exit(chip, desc);
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}
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static int stm32_irq_set_type(struct irq_data *data, unsigned int type)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
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const struct stm32_exti_bank *stm32_bank = gc->private;
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int pin = data->hwirq % IRQS_PER_BANK;
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u32 rtsr, ftsr;
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irq_gc_lock(gc);
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rtsr = irq_reg_readl(gc, stm32_bank->rtsr_ofst);
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ftsr = irq_reg_readl(gc, stm32_bank->ftsr_ofst);
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switch (type) {
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case IRQ_TYPE_EDGE_RISING:
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rtsr |= BIT(pin);
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ftsr &= ~BIT(pin);
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break;
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case IRQ_TYPE_EDGE_FALLING:
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rtsr &= ~BIT(pin);
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ftsr |= BIT(pin);
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break;
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case IRQ_TYPE_EDGE_BOTH:
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rtsr |= BIT(pin);
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ftsr |= BIT(pin);
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break;
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default:
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irq_gc_unlock(gc);
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return -EINVAL;
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}
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irq_reg_writel(gc, rtsr, stm32_bank->rtsr_ofst);
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irq_reg_writel(gc, ftsr, stm32_bank->ftsr_ofst);
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irq_gc_unlock(gc);
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return 0;
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}
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static int stm32_irq_set_wake(struct irq_data *data, unsigned int on)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
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const struct stm32_exti_bank *stm32_bank = gc->private;
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int pin = data->hwirq % IRQS_PER_BANK;
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u32 imr;
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irq_gc_lock(gc);
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imr = irq_reg_readl(gc, stm32_bank->imr_ofst);
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if (on)
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imr |= BIT(pin);
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else
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imr &= ~BIT(pin);
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irq_reg_writel(gc, imr, stm32_bank->imr_ofst);
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irq_gc_unlock(gc);
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return 0;
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}
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static int stm32_exti_alloc(struct irq_domain *d, unsigned int virq,
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unsigned int nr_irqs, void *data)
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{
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struct irq_chip_generic *gc;
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struct irq_fwspec *fwspec = data;
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irq_hw_number_t hwirq;
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hwirq = fwspec->param[0];
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gc = irq_get_domain_generic_chip(d, hwirq);
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irq_map_generic_chip(d, virq, hwirq);
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irq_domain_set_info(d, virq, hwirq, &gc->chip_types->chip, gc,
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handle_simple_irq, NULL, NULL);
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return 0;
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}
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static void stm32_exti_free(struct irq_domain *d, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct irq_data *data = irq_domain_get_irq_data(d, virq);
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irq_domain_reset_irq_data(data);
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}
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struct irq_domain_ops irq_exti_domain_ops = {
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.map = irq_map_generic_chip,
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.xlate = irq_domain_xlate_onetwocell,
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.alloc = stm32_exti_alloc,
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.free = stm32_exti_free,
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};
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static int
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__init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,
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int bank_nr, struct device_node *node)
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{
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unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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int nr_irqs, nr_exti, ret, i;
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struct irq_chip_generic *gc;
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struct irq_domain *domain;
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void *base;
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base = of_iomap(node, 0);
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if (!base) {
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pr_err("%pOF: Unable to map registers\n", node);
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return -ENOMEM;
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}
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domain = irq_domain_add_linear(node, bank_nr * IRQS_PER_BANK,
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&irq_exti_domain_ops, NULL);
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if (!domain) {
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pr_err("%s: Could not register interrupt domain.\n",
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node->name);
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ret = -ENOMEM;
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goto out_unmap;
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}
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ret = irq_alloc_domain_generic_chips(domain, IRQS_PER_BANK, 1, "exti",
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handle_edge_irq, clr, 0, 0);
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if (ret) {
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pr_err("%pOF: Could not allocate generic interrupt chip.\n",
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node);
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goto out_free_domain;
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}
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for (i = 0; i < bank_nr; i++) {
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const struct stm32_exti_bank *stm32_bank = stm32_exti_banks[i];
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u32 irqs_mask;
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gc = irq_get_domain_generic_chip(domain, i * IRQS_PER_BANK);
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gc->reg_base = base;
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gc->chip_types->type = IRQ_TYPE_EDGE_BOTH;
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gc->chip_types->chip.irq_ack = irq_gc_ack_set_bit;
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gc->chip_types->chip.irq_mask = irq_gc_mask_clr_bit;
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gc->chip_types->chip.irq_unmask = irq_gc_mask_set_bit;
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gc->chip_types->chip.irq_set_type = stm32_irq_set_type;
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gc->chip_types->chip.irq_set_wake = stm32_irq_set_wake;
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gc->chip_types->regs.ack = stm32_bank->pr_ofst;
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gc->chip_types->regs.mask = stm32_bank->imr_ofst;
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gc->private = (void *)stm32_bank;
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/* Determine number of irqs supported */
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writel_relaxed(~0UL, base + stm32_bank->rtsr_ofst);
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irqs_mask = readl_relaxed(base + stm32_bank->rtsr_ofst);
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nr_exti = fls(readl_relaxed(base + stm32_bank->rtsr_ofst));
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/*
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* This IP has no reset, so after hot reboot we should
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* clear registers to avoid residue
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*/
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writel_relaxed(0, base + stm32_bank->imr_ofst);
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writel_relaxed(0, base + stm32_bank->emr_ofst);
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writel_relaxed(0, base + stm32_bank->rtsr_ofst);
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writel_relaxed(0, base + stm32_bank->ftsr_ofst);
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writel_relaxed(~0UL, base + stm32_bank->pr_ofst);
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pr_info("%s: bank%d, External IRQs available:%#x\n",
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node->full_name, i, irqs_mask);
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}
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nr_irqs = of_irq_count(node);
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for (i = 0; i < nr_irqs; i++) {
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unsigned int irq = irq_of_parse_and_map(node, i);
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irq_set_handler_data(irq, domain);
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irq_set_chained_handler(irq, stm32_irq_handler);
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}
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return 0;
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out_free_domain:
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irq_domain_remove(domain);
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out_unmap:
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iounmap(base);
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return ret;
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}
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static int __init stm32f4_exti_of_init(struct device_node *np,
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struct device_node *parent)
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{
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return stm32_exti_init(stm32f4xx_exti_banks,
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ARRAY_SIZE(stm32f4xx_exti_banks), np);
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}
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IRQCHIP_DECLARE(stm32f4_exti, "st,stm32-exti", stm32f4_exti_of_init);
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static int __init stm32h7_exti_of_init(struct device_node *np,
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struct device_node *parent)
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{
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return stm32_exti_init(stm32h7xx_exti_banks,
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ARRAY_SIZE(stm32h7xx_exti_banks), np);
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}
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IRQCHIP_DECLARE(stm32h7_exti, "st,stm32h7-exti", stm32h7_exti_of_init);
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