+++ /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 / openwrt.git / blobdiff