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Date: Fri, 16 Aug 2013 21:41:34 +0200
From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc: Russell King <linux@....linux.org.uk>,
Jason Cooper <jason@...edaemon.net>,
Andrew Lunn <andrew@...n.ch>,
Gregory Clement <gregory.clement@...e-electrons.com>,
Thomas Gleixner <tglx@...utronix.de>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Arnd Bergmann <arnd@...db.de>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC v1 1/5] irqchip: add Armada 1500 APB interrupt controller
This adds irqchip drivers for the secondary interrupt controllers found
on Armada 1500 APB and SYSMGT APB bus.
I tried to find a compatible irqchip driver within v3.11-rc5, but there
is no. I guess that it is a common IP core to buy for your SoC, so maybe
one of the maintainers knows a better name for it. Could be DesignWare
type-of as timers are DW, too.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
---
Cc: Russell King <linux@....linux.org.uk>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Gregory Clement <gregory.clement@...e-electrons.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-armada-1500-apb.c | 108 +++++++++++++++++++++++++++++++++
2 files changed, 109 insertions(+)
create mode 100644 drivers/irqchip/irq-armada-1500-apb.c
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index e65c41a..f02f4db 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_IRQCHIP) += irqchip.o
+obj-$(CONFIG_MACH_ARMADA_1500) += irq-armada-1500-apb.o
obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
obj-$(CONFIG_ARCH_EXYNOS) += exynos-combiner.o
obj-$(CONFIG_ARCH_MVEBU) += irq-armada-370-xp.o
diff --git a/drivers/irqchip/irq-armada-1500-apb.c b/drivers/irqchip/irq-armada-1500-apb.c
new file mode 100644
index 0000000..8626eb1
--- /dev/null
+++ b/drivers/irqchip/irq-armada-1500-apb.c
@@ -0,0 +1,108 @@
+/*
+ * Marvell Armada 1500 SoC APB IRQ chip driver.
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+
+#include "irqchip.h"
+
+#define APB_INT_ENABLE 0x00
+#define APB_INT_MASK 0x08
+#define APB_INT_FINALSTATUS 0x30
+
+static void armada_1500_apb_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_get_chip(irq);
+ struct irq_chip_generic *gc = irq_get_handler_data(irq);
+ struct irq_domain *d = gc->private;
+ u32 stat;
+
+ chained_irq_enter(chip, desc);
+
+ stat = readl_relaxed(gc->reg_base + APB_INT_FINALSTATUS);
+
+ while (stat) {
+ u32 hwirq = ffs(stat) - 1;
+ generic_handle_irq(irq_find_mapping(d, gc->irq_base + hwirq));
+ stat &= ~(1 << hwirq);
+ }
+ chained_irq_exit(chip, desc);
+}
+
+static int __init armada_1500_apb_irq_init(struct device_node *np,
+ struct device_node *parent)
+{
+ unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+ struct resource r;
+ struct irq_domain *domain;
+ struct irq_chip_generic *gc;
+ int ret, irq;
+
+ domain = irq_domain_add_linear(np, 32,
+ &irq_generic_chip_ops, NULL);
+ if (!domain) {
+ pr_err("%s: unable to add irq domain\n", np->name);
+ return -ENOMEM;
+ }
+
+ ret = irq_alloc_domain_generic_chips(domain, 32, 1, np->name,
+ handle_level_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
+ if (ret) {
+ pr_err("%s: unable to alloc irq domain gc\n", np->name);
+ return ret;
+ }
+
+ ret = of_address_to_resource(np, 0, &r);
+ if (ret) {
+ pr_err("%s: unable to get resource\n", np->name);
+ return ret;
+ }
+
+ if (!request_mem_region(r.start, resource_size(&r), np->name)) {
+ pr_err("%s: unable to request mem region\n", np->name);
+ return -ENOMEM;
+ }
+
+ /* Map the parent interrupt for the chained handler */
+ irq = irq_of_parse_and_map(np, 0);
+ if (irq <= 0) {
+ pr_err("%s: unable to parse irq\n", np->name);
+ return -EINVAL;
+ }
+
+ gc = irq_get_domain_generic_chip(domain, 0);
+ gc->private = domain;
+ gc->reg_base = ioremap(r.start, resource_size(&r));
+ if (!gc->reg_base) {
+ pr_err("%s: unable to map resource\n", np->name);
+ return -ENOMEM;
+ }
+
+ gc->chip_types[0].regs.mask = APB_INT_MASK;
+ gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
+ gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
+
+ /* mask and enable all interrupts */
+ writel(~0, gc->reg_base + APB_INT_MASK);
+ writel(~0, gc->reg_base + APB_INT_ENABLE);
+
+ irq_set_handler_data(irq, gc);
+ irq_set_chained_handler(irq, armada_1500_apb_irq_handler);
+
+ return 0;
+}
+IRQCHIP_DECLARE(armada_1500_apb_intc,
+ "marvell,armada-1500-apb-intc", armada_1500_apb_irq_init);
--
1.7.10.4
--
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