summaryrefslogtreecommitdiff
path: root/drivers/irqchip
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/Kconfig4
-rw-r--r--drivers/irqchip/Makefile1
-rw-r--r--drivers/irqchip/irq-xilinx-intc.c196
3 files changed, 201 insertions, 0 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index bc0af3307bbf..ae96731cd2fb 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -211,6 +211,10 @@ config XTENSA_MX
bool
select IRQ_DOMAIN
+config XILINX_INTC
+ bool
+ select IRQ_DOMAIN
+
config IRQ_CROSSBAR
bool
help
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index e4dbfc85abdb..0e55d94065bf 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_TB10X_IRQC) += irq-tb10x.o
obj-$(CONFIG_TS4800_IRQ) += irq-ts4800.o
obj-$(CONFIG_XTENSA) += irq-xtensa-pic.o
obj-$(CONFIG_XTENSA_MX) += irq-xtensa-mx.o
+obj-$(CONFIG_XILINX_INTC) += irq-xilinx-intc.o
obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o
obj-$(CONFIG_SOC_VF610) += irq-vf610-mscm-ir.o
obj-$(CONFIG_BCM6345_L1_IRQ) += irq-bcm6345-l1.o
diff --git a/drivers/irqchip/irq-xilinx-intc.c b/drivers/irqchip/irq-xilinx-intc.c
new file mode 100644
index 000000000000..90bec7d71f85
--- /dev/null
+++ b/drivers/irqchip/irq-xilinx-intc.c
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2007-2013 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2012-2013 Xilinx, Inc.
+ * Copyright (C) 2007-2009 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, 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/irqdomain.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/bug.h>
+
+static void __iomem *intc_baseaddr;
+
+/* No one else should require these constants, so define them locally here. */
+#define ISR 0x00 /* Interrupt Status Register */
+#define IPR 0x04 /* Interrupt Pending Register */
+#define IER 0x08 /* Interrupt Enable Register */
+#define IAR 0x0c /* Interrupt Acknowledge Register */
+#define SIE 0x10 /* Set Interrupt Enable bits */
+#define CIE 0x14 /* Clear Interrupt Enable bits */
+#define IVR 0x18 /* Interrupt Vector Register */
+#define MER 0x1c /* Master Enable Register */
+
+#define MER_ME (1<<0)
+#define MER_HIE (1<<1)
+
+static unsigned int (*read_fn)(void __iomem *);
+static void (*write_fn)(u32, void __iomem *);
+
+static void intc_write32(u32 val, void __iomem *addr)
+{
+ iowrite32(val, addr);
+}
+
+static unsigned int intc_read32(void __iomem *addr)
+{
+ return ioread32(addr);
+}
+
+static void intc_write32_be(u32 val, void __iomem *addr)
+{
+ iowrite32be(val, addr);
+}
+
+static unsigned int intc_read32_be(void __iomem *addr)
+{
+ return ioread32be(addr);
+}
+
+static void intc_enable_or_unmask(struct irq_data *d)
+{
+ unsigned long mask = 1 << d->hwirq;
+
+ pr_debug("enable_or_unmask: %ld\n", d->hwirq);
+
+ /* ack level irqs because they can't be acked during
+ * ack function since the handle_level_irq function
+ * acks the irq before calling the interrupt handler
+ */
+ if (irqd_is_level_type(d))
+ write_fn(mask, intc_baseaddr + IAR);
+
+ write_fn(mask, intc_baseaddr + SIE);
+}
+
+static void intc_disable_or_mask(struct irq_data *d)
+{
+ pr_debug("disable: %ld\n", d->hwirq);
+ write_fn(1 << d->hwirq, intc_baseaddr + CIE);
+}
+
+static void intc_ack(struct irq_data *d)
+{
+ pr_debug("ack: %ld\n", d->hwirq);
+ write_fn(1 << d->hwirq, intc_baseaddr + IAR);
+}
+
+static void intc_mask_ack(struct irq_data *d)
+{
+ unsigned long mask = 1 << d->hwirq;
+
+ pr_debug("disable_and_ack: %ld\n", d->hwirq);
+ write_fn(mask, intc_baseaddr + CIE);
+ write_fn(mask, intc_baseaddr + IAR);
+}
+
+static struct irq_chip intc_dev = {
+ .name = "Xilinx INTC",
+ .irq_unmask = intc_enable_or_unmask,
+ .irq_mask = intc_disable_or_mask,
+ .irq_ack = intc_ack,
+ .irq_mask_ack = intc_mask_ack,
+};
+
+static struct irq_domain *root_domain;
+
+unsigned int get_irq(void)
+{
+ unsigned int hwirq, irq = -1;
+
+ hwirq = read_fn(intc_baseaddr + IVR);
+ if (hwirq != -1U)
+ irq = irq_find_mapping(root_domain, hwirq);
+
+ pr_debug("get_irq: hwirq=%d, irq=%d\n", hwirq, irq);
+
+ return irq;
+}
+
+static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+{
+ u32 intr_mask = (u32)d->host_data;
+
+ if (intr_mask & (1 << hw)) {
+ irq_set_chip_and_handler_name(irq, &intc_dev,
+ handle_edge_irq, "edge");
+ irq_clear_status_flags(irq, IRQ_LEVEL);
+ } else {
+ irq_set_chip_and_handler_name(irq, &intc_dev,
+ handle_level_irq, "level");
+ irq_set_status_flags(irq, IRQ_LEVEL);
+ }
+ return 0;
+}
+
+static const struct irq_domain_ops xintc_irq_domain_ops = {
+ .xlate = irq_domain_xlate_onetwocell,
+ .map = xintc_map,
+};
+
+static int __init xilinx_intc_of_init(struct device_node *intc,
+ struct device_node *parent)
+{
+ u32 nr_irq, intr_mask;
+ int ret;
+
+ intc_baseaddr = of_iomap(intc, 0);
+ BUG_ON(!intc_baseaddr);
+
+ ret = of_property_read_u32(intc, "xlnx,num-intr-inputs", &nr_irq);
+ if (ret < 0) {
+ pr_err("%s: unable to read xlnx,num-intr-inputs\n", __func__);
+ return ret;
+ }
+
+ ret = of_property_read_u32(intc, "xlnx,kind-of-intr", &intr_mask);
+ if (ret < 0) {
+ pr_err("%s: unable to read xlnx,kind-of-intr\n", __func__);
+ return ret;
+ }
+
+ if (intr_mask >> nr_irq)
+ pr_warn("%s: mismatch in kind-of-intr param\n", __func__);
+
+ pr_info("%s: num_irq=%d, edge=0x%x\n",
+ intc->full_name, nr_irq, intr_mask);
+
+ write_fn = intc_write32;
+ read_fn = intc_read32;
+
+ /*
+ * Disable all external interrupts until they are
+ * explicity requested.
+ */
+ write_fn(0, intc_baseaddr + IER);
+
+ /* Acknowledge any pending interrupts just in case. */
+ write_fn(0xffffffff, intc_baseaddr + IAR);
+
+ /* Turn on the Master Enable. */
+ write_fn(MER_HIE | MER_ME, intc_baseaddr + MER);
+ if (!(read_fn(intc_baseaddr + MER) & (MER_HIE | MER_ME))) {
+ write_fn = intc_write32_be;
+ read_fn = intc_read32_be;
+ write_fn(MER_HIE | MER_ME, intc_baseaddr + MER);
+ }
+
+ /* Yeah, okay, casting the intr_mask to a void* is butt-ugly, but I'm
+ * lazy and Michal can clean it up to something nicer when he tests
+ * and commits this patch. ~~gcl */
+ root_domain = irq_domain_add_linear(intc, nr_irq, &xintc_irq_domain_ops,
+ (void *)intr_mask);
+
+ irq_set_default_host(root_domain);
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(xilinx_intc, "xlnx,xps-intc-1.00.a", xilinx_intc_of_init);