Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / irqchip / irq-xtensa-pic.c

diff --git a/kernel/drivers/irqchip/irq-xtensa-pic.c b/kernel/drivers/irqchip/irq-xtensa-pic.c
new file mode 100644 (file)
index 0000000..7d71126
--- /dev/null
+++ b/kernel/drivers/irqchip/irq-xtensa-pic.c
@@ -0,0 +1,108 @@
+/*
+ * Xtensa built-in interrupt controller
+ *
+ * Copyright (C) 2002 - 2013 Tensilica, Inc.
+ * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ *
+ * 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.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Kevin Chea
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+
+#include "irqchip.h"
+
+unsigned int cached_irq_mask;
+
+/*
+ * Device Tree IRQ specifier translation function which works with one or
+ * two cell bindings. First cell value maps directly to the hwirq number.
+ * Second cell if present specifies whether hwirq number is external (1) or
+ * internal (0).
+ */
+static int xtensa_pic_irq_domain_xlate(struct irq_domain *d,
+               struct device_node *ctrlr,
+               const u32 *intspec, unsigned int intsize,
+               unsigned long *out_hwirq, unsigned int *out_type)
+{
+       return xtensa_irq_domain_xlate(intspec, intsize,
+                       intspec[0], intspec[0],
+                       out_hwirq, out_type);
+}
+
+static const struct irq_domain_ops xtensa_irq_domain_ops = {
+       .xlate = xtensa_pic_irq_domain_xlate,
+       .map = xtensa_irq_map,
+};
+
+static void xtensa_irq_mask(struct irq_data *d)
+{
+       cached_irq_mask &= ~(1 << d->hwirq);
+       set_sr(cached_irq_mask, intenable);
+}
+
+static void xtensa_irq_unmask(struct irq_data *d)
+{
+       cached_irq_mask |= 1 << d->hwirq;
+       set_sr(cached_irq_mask, intenable);
+}
+
+static void xtensa_irq_enable(struct irq_data *d)
+{
+       variant_irq_enable(d->hwirq);
+       xtensa_irq_unmask(d);
+}
+
+static void xtensa_irq_disable(struct irq_data *d)
+{
+       xtensa_irq_mask(d);
+       variant_irq_disable(d->hwirq);
+}
+
+static void xtensa_irq_ack(struct irq_data *d)
+{
+       set_sr(1 << d->hwirq, intclear);
+}
+
+static int xtensa_irq_retrigger(struct irq_data *d)
+{
+       set_sr(1 << d->hwirq, intset);
+       return 1;
+}
+
+static struct irq_chip xtensa_irq_chip = {
+       .name           = "xtensa",
+       .irq_enable     = xtensa_irq_enable,
+       .irq_disable    = xtensa_irq_disable,
+       .irq_mask       = xtensa_irq_mask,
+       .irq_unmask     = xtensa_irq_unmask,
+       .irq_ack        = xtensa_irq_ack,
+       .irq_retrigger  = xtensa_irq_retrigger,
+};
+
+int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent)
+{
+       struct irq_domain *root_domain =
+               irq_domain_add_legacy(NULL, NR_IRQS, 0, 0,
+                               &xtensa_irq_domain_ops, &xtensa_irq_chip);
+       irq_set_default_host(root_domain);
+       return 0;
+}
+
+static int __init xtensa_pic_init(struct device_node *np,
+               struct device_node *interrupt_parent)
+{
+       struct irq_domain *root_domain =
+               irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops,
+                               &xtensa_irq_chip);
+       irq_set_default_host(root_domain);
+       return 0;
+}
+IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init);