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authorRich Felker <dalias@libc.org>2016-03-17 23:12:12 +0000
committerRich Felker <dalias@libc.org>2016-06-08 21:54:36 +0000
commitab76dc8d97e4c14afd9da8dce5d17fb7bf1af120 (patch)
tree7df1e49e3d1a3e68107637c9654cf6758307b1d9
parentf3f7171c829eadc4584494d8033f0322ed0a0968 (diff)
downloadlinux-sh-ab76dc8d97e4c14afd9da8dce5d17fb7bf1af120.tar.gz
irqchip: add J-Core AIC driver
There are two versions of the J-Core interrupt controller in use, aic1 which generates interrupts with programmable priorities, but only supports 8 irq lines and maps them to cpu traps in the range 17 to 24, and aic2 which uses traps in the range 64-127 and supports up to 128 irqs, with priorities dependent on the interrupt number. The Linux driver does not make use of priorities anyway. For simplicity, there is no aic1-specific logic in the driver beyond setting the priority register, which is necessary for interrupts to work at all. Eventually aic1 will likely be phased out, but it's currently in use in deployments and all released bitstream binaries. Signed-off-by: Rich Felker <dalias@libc.org>
-rw-r--r--drivers/irqchip/Kconfig6
-rw-r--r--drivers/irqchip/Makefile1
-rw-r--r--drivers/irqchip/irq-jcore-aic.c95
3 files changed, 102 insertions, 0 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 3e124793e224..3cb37d605a56 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -149,6 +149,12 @@ config PIC32_EVIC
select GENERIC_IRQ_CHIP
select IRQ_DOMAIN
+config JCORE_AIC
+ bool "J-Core integrated AIC"
+ select IRQ_DOMAIN
+ help
+ Support for the J-Core integrated AIC.
+
config RENESAS_INTC_IRQPIN
bool
select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index b03cfcbbac6b..5a1f1bf0d339 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_I8259) += irq-i8259.o
obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o
obj-$(CONFIG_IRQ_MIPS_CPU) += irq-mips-cpu.o
obj-$(CONFIG_SIRF_IRQ) += irq-sirfsoc.o
+obj-$(CONFIG_JCORE_AIC) += irq-jcore-aic.o
obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o
obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o
obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
diff --git a/drivers/irqchip/irq-jcore-aic.c b/drivers/irqchip/irq-jcore-aic.c
new file mode 100644
index 000000000000..1348cdb7ffe8
--- /dev/null
+++ b/drivers/irqchip/irq-jcore-aic.c
@@ -0,0 +1,95 @@
+/*
+ * J-Core SoC AIC driver
+ *
+ * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#define AIC1_INTPRI 8
+
+static struct aic_data {
+ unsigned char __iomem *base;
+ u32 cpu_offset;
+ struct irq_chip chip;
+ struct irq_domain *domain;
+ struct notifier_block nb;
+} aic_data;
+
+static int aic_irqdomain_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq)
+{
+ struct aic_data *aic = d->host_data;
+
+ irq_set_chip_data(irq, aic);
+ irq_set_chip_and_handler(irq, &aic->chip, handle_simple_irq);
+ irq_set_probe(irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops aic_irqdomain_ops = {
+ .map = aic_irqdomain_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static void noop(struct irq_data *data)
+{
+}
+
+static void aic1_localenable(struct aic_data *aic)
+{
+ unsigned cpu = smp_processor_id();
+ pr_info("Local AIC enable on cpu %u\n", cpu);
+ writel(0xffffffff, aic->base + cpu * aic->cpu_offset + AIC1_INTPRI);
+}
+
+static int aic1_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
+{
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_STARTING:
+ aic1_localenable(container_of(self, struct aic_data, nb));
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+int __init aic_irq_of_init(struct device_node *node, struct device_node *parent)
+{
+ struct aic_data *aic = &aic_data;
+
+ aic->base = of_iomap(node, 0);
+ of_property_read_u32(node, "cpu-offset", &aic->cpu_offset);
+
+ pr_info("Initializing J-Core AIC at %p\n", aic->base);
+
+ if (of_device_is_compatible(node, "jcore,aic1")) {
+ /* For aic1, need to enabled zero-priority-by-default irqs */
+ aic->nb.notifier_call = aic1_cpu_notify;
+ register_cpu_notifier(&aic->nb);
+ aic1_localenable(aic);
+ }
+
+ aic->chip.name = node->name;
+ aic->chip.irq_mask = noop;
+ aic->chip.irq_unmask = noop;
+
+ aic->domain = irq_domain_add_linear(node, 128, &aic_irqdomain_ops, aic);
+ irq_create_strict_mappings(aic->domain, 16, 16, 112);
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(jcore_aic2, "jcore,aic2", aic_irq_of_init);
+IRQCHIP_DECLARE(jcore_aic1, "jcore,aic1", aic_irq_of_init);