--- /dev/null
+From f3eacff2310a60348a755c50a8da6fc251fc8587 Mon Sep 17 00:00:00 2001
+From: John Crispin <john@phrozen.org>
+Date: Tue, 6 Mar 2018 09:55:13 +0100
+Subject: [PATCH 07/33] irqchip/irq-ath79-intc: add irq cascade driver for
+ QCA9556 SoCs
+
+Signed-off-by: John Crispin <john@phrozen.org>
+---
+ drivers/irqchip/Makefile | 1 +
+ drivers/irqchip/irq-ath79-intc.c | 142 +++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 143 insertions(+)
+ create mode 100644 drivers/irqchip/irq-ath79-intc.c
+
+--- a/drivers/irqchip/Makefile
++++ b/drivers/irqchip/Makefile
+@@ -4,6 +4,7 @@ obj-$(CONFIG_IRQCHIP) += irqchip.o
+ obj-$(CONFIG_AL_FIC) += irq-al-fic.o
+ obj-$(CONFIG_ALPINE_MSI) += irq-alpine-msi.o
+ obj-$(CONFIG_ATH79) += irq-ath79-cpu.o
++obj-$(CONFIG_ATH79) += irq-ath79-intc.o
+ obj-$(CONFIG_ATH79) += irq-ath79-misc.o
+ obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
+ obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2836.o
+--- /dev/null
++++ b/drivers/irqchip/irq-ath79-intc.c
+@@ -0,0 +1,142 @@
++/*
++ * Atheros AR71xx/AR724x/AR913x specific interrupt handling
++ *
++ * Copyright (C) 2018 John Crispin <john@phrozen.org>
++ *
++ * 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.
++ */
++
++#include <linux/interrupt.h>
++#include <linux/irqchip.h>
++#include <linux/of.h>
++#include <linux/of_irq.h>
++#include <linux/irqdomain.h>
++
++#include <asm/irq_cpu.h>
++#include <asm/mach-ath79/ath79.h>
++#include <asm/mach-ath79/ar71xx_regs.h>
++
++#define ATH79_MAX_INTC_CASCADE 3
++
++struct ath79_intc {
++ struct irq_chip chip;
++ u32 irq;
++ u32 pending_mask;
++ u32 int_status;
++ u32 irq_mask[ATH79_MAX_INTC_CASCADE];
++ u32 irq_wb_chan[ATH79_MAX_INTC_CASCADE];
++};
++
++static void ath79_intc_irq_handler(struct irq_desc *desc)
++{
++ struct irq_domain *domain = irq_desc_get_handler_data(desc);
++ struct ath79_intc *intc = domain->host_data;
++ u32 pending;
++
++ pending = ath79_reset_rr(intc->int_status);
++ pending &= intc->pending_mask;
++
++ if (pending) {
++ int i;
++
++ for (i = 0; i < domain->hwirq_max; i++)
++ if (pending & intc->irq_mask[i]) {
++ if (intc->irq_wb_chan[i] != 0xffffffff)
++ ath79_ddr_wb_flush(intc->irq_wb_chan[i]);
++ generic_handle_irq(irq_find_mapping(domain, i));
++ }
++ } else {
++ spurious_interrupt();
++ }
++}
++
++static void ath79_intc_irq_enable(struct irq_data *d)
++{
++ struct ath79_intc *intc = d->domain->host_data;
++ enable_irq(intc->irq);
++}
++
++static void ath79_intc_irq_disable(struct irq_data *d)
++{
++ struct ath79_intc *intc = d->domain->host_data;
++ disable_irq(intc->irq);
++}
++
++static int ath79_intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
++{
++ struct ath79_intc *intc = d->host_data;
++
++ irq_set_chip_and_handler(irq, &intc->chip, handle_level_irq);
++
++ return 0;
++}
++
++static const struct irq_domain_ops ath79_irq_domain_ops = {
++ .xlate = irq_domain_xlate_onecell,
++ .map = ath79_intc_map,
++};
++
++static int __init ath79_intc_of_init(
++ struct device_node *node, struct device_node *parent)
++{
++ struct irq_domain *domain;
++ struct ath79_intc *intc;
++ int cnt, cntwb, i, err;
++
++ cnt = of_property_count_u32_elems(node, "qca,pending-bits");
++ if (cnt > ATH79_MAX_INTC_CASCADE)
++ panic("Too many INTC pending bits\n");
++
++ intc = kzalloc(sizeof(*intc), GFP_KERNEL);
++ if (!intc)
++ panic("Failed to allocate INTC memory\n");
++ intc->chip = dummy_irq_chip;
++ intc->chip.name = "INTC";
++ intc->chip.irq_disable = ath79_intc_irq_disable;
++ intc->chip.irq_enable = ath79_intc_irq_enable;
++
++ if (of_property_read_u32(node, "qca,int-status-addr", &intc->int_status) < 0) {
++ panic("Missing address of interrupt status register\n");
++ }
++
++ of_property_read_u32_array(node, "qca,pending-bits", intc->irq_mask, cnt);
++ for (i = 0; i < cnt; i++) {
++ intc->pending_mask |= intc->irq_mask[i];
++ intc->irq_wb_chan[i] = 0xffffffff;
++ }
++
++ cntwb = of_count_phandle_with_args(
++ node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");
++
++ for (i = 0; i < cntwb; i++) {
++ struct of_phandle_args args;
++ u32 irq = i;
++
++ of_property_read_u32_index(
++ node, "qca,ddr-wb-channel-interrupts", i, &irq);
++ if (irq >= ATH79_MAX_INTC_CASCADE)
++ continue;
++
++ err = of_parse_phandle_with_args(
++ node, "qca,ddr-wb-channels",
++ "#qca,ddr-wb-channel-cells",
++ i, &args);
++ if (err)
++ return err;
++
++ intc->irq_wb_chan[irq] = args.args[0];
++ }
++
++ intc->irq = irq_of_parse_and_map(node, 0);
++ if (!intc->irq)
++ panic("Failed to get INTC IRQ");
++
++ domain = irq_domain_add_linear(node, cnt, &ath79_irq_domain_ops, intc);
++ irq_set_chained_handler_and_data(intc->irq, ath79_intc_irq_handler, domain);
++
++ return 0;
++}
++IRQCHIP_DECLARE(ath79_intc, "qca,ar9340-intc",
++ ath79_intc_of_init);
projects / openwrt / staging / blocktrron.git / blobdiff