Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq updates from Thomas Gleixner:
 "Nothing spectacular from the irq department this time:
   - overhaul of the crossbar chip driver
   - overhaul of the spear shirq chip driver
   - support for the atmel-aic chip
   - code move from arch to drivers
   - the usual tiny fixlets
   - two reverts worth to mention which undo the too simple attempt of
     supporting wakeup interrupts on shared interrupt lines"

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (41 commits)
  Revert "irq: Warn when shared interrupts do not match on NO_SUSPEND"
  Revert "PM / sleep / irq: Do not suspend wakeup interrupts"
  irq: Warn when shared interrupts do not match on NO_SUSPEND
  irqchip: atmel-aic: Define irq fixups for atmel SoCs
  irqchip: atmel-aic: Implement RTC irq fixup
  irqchip: atmel-aic: Add irq fixup infrastructure
  irqchip: atmel-aic: Add atmel AIC/AIC5 drivers
  irqchip: atmel-aic: Move binding doc to interrupt-controller directory
  genirq: generic chip: Export irq_map_generic_chip function
  PM / sleep / irq: Do not suspend wakeup interrupts
  irqchip: or1k-pic: Migrate from arch/openrisc/
  irqchip: crossbar: Allow for quirky hardware with direct hardwiring of GIC
  documentation: dt: omap: crossbar: Add description for interrupt consumer
  irqchip: crossbar: Introduce centralized check for crossbar write
  irqchip: crossbar: Introduce ti, max-crossbar-sources to identify valid crossbar mapping
  irqchip: crossbar: Add kerneldoc for crossbar_domain_unmap callback
  irqchip: crossbar: Set cb pointer to null in case of error
  irqchip: crossbar: Change the goto naming
  irqchip: crossbar: Return proper error value
  irqchip: crossbar: Fix kerneldoc warning
  ...

1 files changed, 182 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-or1k-pic.c b/drivers/irqchip/irq-or1k-pic.c
new file mode 100644
index 000000000000..17ff033d9925
--- /dev/null
+++ b/drivers/irqchip/irq-or1k-pic.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ * Copyright (C) 2014 Stefan Kristansson <stefan.kristiansson@saunalahti.fi>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+
+#include "irqchip.h"
+
+/* OR1K PIC implementation */
+
+struct or1k_pic_dev {
+	struct irq_chip chip;
+	irq_flow_handler_t handle;
+	unsigned long flags;
+};
+
+/*
+ * We're a couple of cycles faster than the generic implementations with
+ * these 'fast' versions.
+ */
+
+static void or1k_pic_mask(struct irq_data *data)
+{
+	mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
+}
+
+static void or1k_pic_unmask(struct irq_data *data)
+{
+	mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (1UL << data->hwirq));
+}
+
+static void or1k_pic_ack(struct irq_data *data)
+{
+	mtspr(SPR_PICSR, (1UL << data->hwirq));
+}
+
+static void or1k_pic_mask_ack(struct irq_data *data)
+{
+	mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
+	mtspr(SPR_PICSR, (1UL << data->hwirq));
+}
+
+/*
+ * There are two oddities with the OR1200 PIC implementation:
+ * i)  LEVEL-triggered interrupts are latched and need to be cleared
+ * ii) the interrupt latch is cleared by writing a 0 to the bit,
+ *     as opposed to a 1 as mandated by the spec
+ */
+static void or1k_pic_or1200_ack(struct irq_data *data)
+{
+	mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
+}
+
+static void or1k_pic_or1200_mask_ack(struct irq_data *data)
+{
+	mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
+	mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
+}
+
+static struct or1k_pic_dev or1k_pic_level = {
+	.chip = {
+		.name = "or1k-PIC-level",
+		.irq_unmask = or1k_pic_unmask,
+		.irq_mask = or1k_pic_mask,
+		.irq_mask_ack = or1k_pic_mask,
+	},
+	.handle = handle_level_irq,
+	.flags = IRQ_LEVEL | IRQ_NOPROBE,
+};
+
+static struct or1k_pic_dev or1k_pic_edge = {
+	.chip = {
+		.name = "or1k-PIC-edge",
+		.irq_unmask = or1k_pic_unmask,
+		.irq_mask = or1k_pic_mask,
+		.irq_ack = or1k_pic_ack,
+		.irq_mask_ack = or1k_pic_mask_ack,
+	},
+	.handle = handle_edge_irq,
+	.flags = IRQ_LEVEL | IRQ_NOPROBE,
+};
+
+static struct or1k_pic_dev or1k_pic_or1200 = {
+	.chip = {
+		.name = "or1200-PIC",
+		.irq_unmask = or1k_pic_unmask,
+		.irq_mask = or1k_pic_mask,
+		.irq_ack = or1k_pic_or1200_ack,
+		.irq_mask_ack = or1k_pic_or1200_mask_ack,
+	},
+	.handle = handle_level_irq,
+	.flags = IRQ_LEVEL | IRQ_NOPROBE,
+};
+
+static struct irq_domain *root_domain;
+
+static inline int pic_get_irq(int first)
+{
+	int hwirq;
+
+	hwirq = ffs(mfspr(SPR_PICSR) >> first);
+	if (!hwirq)
+		return NO_IRQ;
+	else
+		hwirq = hwirq + first - 1;
+
+	return irq_find_mapping(root_domain, hwirq);
+}
+
+static void or1k_pic_handle_irq(struct pt_regs *regs)
+{
+	int irq = -1;
+
+	while ((irq = pic_get_irq(irq + 1)) != NO_IRQ)
+		handle_IRQ(irq, regs);
+}
+
+static int or1k_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+{
+	struct or1k_pic_dev *pic = d->host_data;
+
+	irq_set_chip_and_handler(irq, &pic->chip, pic->handle);
+	irq_set_status_flags(irq, pic->flags);
+
+	return 0;
+}
+
+static const struct irq_domain_ops or1k_irq_domain_ops = {
+	.xlate = irq_domain_xlate_onecell,
+	.map = or1k_map,
+};
+
+/*
+ * This sets up the IRQ domain for the PIC built in to the OpenRISC
+ * 1000 CPU.  This is the "root" domain as these are the interrupts
+ * that directly trigger an exception in the CPU.
+ */
+static int __init or1k_pic_init(struct device_node *node,
+				 struct or1k_pic_dev *pic)
+{
+	/* Disable all interrupts until explicitly requested */
+	mtspr(SPR_PICMR, (0UL));
+
+	root_domain = irq_domain_add_linear(node, 32, &or1k_irq_domain_ops,
+					    pic);
+
+	set_handle_irq(or1k_pic_handle_irq);
+
+	return 0;
+}
+
+static int __init or1k_pic_or1200_init(struct device_node *node,
+				       struct device_node *parent)
+{
+	return or1k_pic_init(node, &or1k_pic_or1200);
+}
+IRQCHIP_DECLARE(or1k_pic_or1200, "opencores,or1200-pic", or1k_pic_or1200_init);
+IRQCHIP_DECLARE(or1k_pic, "opencores,or1k-pic", or1k_pic_or1200_init);
+
+static int __init or1k_pic_level_init(struct device_node *node,
+				      struct device_node *parent)
+{
+	return or1k_pic_init(node, &or1k_pic_level);
+}
+IRQCHIP_DECLARE(or1k_pic_level, "opencores,or1k-pic-level",
+		or1k_pic_level_init);
+
+static int __init or1k_pic_edge_init(struct device_node *node,
+				     struct device_node *parent)
+{
+	return or1k_pic_init(node, &or1k_pic_edge);
+}
+IRQCHIP_DECLARE(or1k_pic_edge, "opencores,or1k-pic-edge", or1k_pic_edge_init);