ARM: plat-versatile: move FPGA irq driver to drivers/irqchip

This moves the Versatile FPGA interrupt controller driver, used in
the Integrator/AP, Integrator/CP and some Versatile boards, out
of arch/arm/plat-versatile and down to drivers/irqchip where we
have consensus that such drivers belong. The header file is
consequently moved to <linux/platform_data/irq-versatile-fpga.h>.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

8 files changed, 5 insertions, 233 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 73067efd4845..2205e3eb55bf 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -284,8 +284,8 @@ config ARCH_INTEGRATOR
 	select MULTI_IRQ_HANDLER
 	select NEED_MACH_MEMORY_H
 	select PLAT_VERSATILE
-	select PLAT_VERSATILE_FPGA_IRQ
 	select SPARSE_IRQ
+	select VERSATILE_FPGA_IRQ
 	help
 	  Support for ARM's Integrator platform.
 
@@ -318,7 +318,7 @@ config ARCH_VERSATILE
 	select PLAT_VERSATILE
 	select PLAT_VERSATILE_CLCD
 	select PLAT_VERSATILE_CLOCK
-	select PLAT_VERSATILE_FPGA_IRQ
+	select VERSATILE_FPGA_IRQ
 	help
 	  This enables support for ARM Ltd Versatile board.
 
diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
index 4f13bc57e5a4..e67a9fe18d1b 100644
--- a/arch/arm/mach-integrator/integrator_ap.c
+++ b/arch/arm/mach-integrator/integrator_ap.c
@@ -31,6 +31,7 @@
 #include <linux/clockchips.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/mtd/physmap.h>
 #include <linux/clk.h>
 #include <linux/platform_data/clk-integrator.h>
@@ -56,8 +57,6 @@
 #include <asm/mach/pci.h>
 #include <asm/mach/time.h>
 
-#include <plat/fpga-irq.h>
-
 #include "common.h"
 
 /* 
diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index 4423bc8e84c5..acecf04f50f7 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/arch/arm/mach-integrator/integrator_cp.c
@@ -20,6 +20,7 @@
 #include <linux/amba/clcd.h>
 #include <linux/amba/mmci.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/gfp.h>
 #include <linux/mtd/physmap.h>
 #include <linux/platform_data/clk-integrator.h>
@@ -46,7 +47,6 @@
 #include <asm/hardware/timer-sp.h>
 
 #include <plat/clcd.h>
-#include <plat/fpga-irq.h>
 #include <plat/sched_clock.h>
 
 #include "common.h"
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 5b5c1eeb5b5c..5d5929450366 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -32,6 +32,7 @@
 #include <linux/amba/mmci.h>
 #include <linux/amba/pl022.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/gfp.h>
 #include <linux/clkdev.h>
 #include <linux/mtd/physmap.h>
@@ -51,7 +52,6 @@
 #include <asm/hardware/timer-sp.h>
 
 #include <plat/clcd.h>
-#include <plat/fpga-irq.h>
 #include <plat/sched_clock.h>
 
 #include "core.h"
diff --git a/arch/arm/plat-versatile/Kconfig b/arch/arm/plat-versatile/Kconfig
index 2a4ae8a6a081..619f0fa0f06c 100644
--- a/arch/arm/plat-versatile/Kconfig
+++ b/arch/arm/plat-versatile/Kconfig
@@ -6,15 +6,6 @@ config PLAT_VERSATILE_CLOCK
 config PLAT_VERSATILE_CLCD
 	bool
 
-config PLAT_VERSATILE_FPGA_IRQ
-	bool
-	select IRQ_DOMAIN
-
-config PLAT_VERSATILE_FPGA_IRQ_NR
-       int
-       default 4
-       depends on PLAT_VERSATILE_FPGA_IRQ
-
 config PLAT_VERSATILE_LEDS
 	def_bool y if NEW_LEDS
 	depends on ARCH_REALVIEW || ARCH_VERSATILE
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index 74cfd94cbf80..f88d448b629c 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -2,7 +2,6 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include
 
 obj-$(CONFIG_PLAT_VERSATILE_CLOCK) += clock.o
 obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o
-obj-$(CONFIG_PLAT_VERSATILE_FPGA_IRQ) += fpga-irq.o
 obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o
 obj-$(CONFIG_PLAT_VERSATILE_SCHED_CLOCK) += sched-clock.o
 obj-$(CONFIG_SMP) += headsmp.o platsmp.o
diff --git a/arch/arm/plat-versatile/fpga-irq.c b/arch/arm/plat-versatile/fpga-irq.c
deleted file mode 100644
index dfe317c20354..000000000000
--- a/arch/arm/plat-versatile/fpga-irq.c
+++ /dev/null
@@ -1,204 +0,0 @@
-/*
- *  Support for Versatile FPGA-based IRQ controllers
- */
-#include <linux/bitops.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <linux/irqdomain.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-
-#include <asm/exception.h>
-#include <asm/mach/irq.h>
-#include <plat/fpga-irq.h>
-
-#define IRQ_STATUS		0x00
-#define IRQ_RAW_STATUS		0x04
-#define IRQ_ENABLE_SET		0x08
-#define IRQ_ENABLE_CLEAR	0x0c
-#define INT_SOFT_SET		0x10
-#define INT_SOFT_CLEAR		0x14
-#define FIQ_STATUS		0x20
-#define FIQ_RAW_STATUS		0x24
-#define FIQ_ENABLE		0x28
-#define FIQ_ENABLE_SET		0x28
-#define FIQ_ENABLE_CLEAR	0x2C
-
-/**
- * struct fpga_irq_data - irq data container for the FPGA IRQ controller
- * @base: memory offset in virtual memory
- * @chip: chip container for this instance
- * @domain: IRQ domain for this instance
- * @valid: mask for valid IRQs on this controller
- * @used_irqs: number of active IRQs on this controller
- */
-struct fpga_irq_data {
-	void __iomem *base;
-	struct irq_chip chip;
-	u32 valid;
-	struct irq_domain *domain;
-	u8 used_irqs;
-};
-
-/* we cannot allocate memory when the controllers are initially registered */
-static struct fpga_irq_data fpga_irq_devices[CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR];
-static int fpga_irq_id;
-
-static void fpga_irq_mask(struct irq_data *d)
-{
-	struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
-	u32 mask = 1 << d->hwirq;
-
-	writel(mask, f->base + IRQ_ENABLE_CLEAR);
-}
-
-static void fpga_irq_unmask(struct irq_data *d)
-{
-	struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
-	u32 mask = 1 << d->hwirq;
-
-	writel(mask, f->base + IRQ_ENABLE_SET);
-}
-
-static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
-{
-	struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
-	u32 status = readl(f->base + IRQ_STATUS);
-
-	if (status == 0) {
-		do_bad_IRQ(irq, desc);
-		return;
-	}
-
-	do {
-		irq = ffs(status) - 1;
-		status &= ~(1 << irq);
-		generic_handle_irq(irq_find_mapping(f->domain, irq));
-	} while (status);
-}
-
-/*
- * Handle each interrupt in a single FPGA IRQ controller.  Returns non-zero
- * if we've handled at least one interrupt.  This does a single read of the
- * status register and handles all interrupts in order from LSB first.
- */
-static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs)
-{
-	int handled = 0;
-	int irq;
-	u32 status;
-
-	while ((status  = readl(f->base + IRQ_STATUS))) {
-		irq = ffs(status) - 1;
-		handle_IRQ(irq_find_mapping(f->domain, irq), regs);
-		handled = 1;
-	}
-
-	return handled;
-}
-
-/*
- * Keep iterating over all registered FPGA IRQ controllers until there are
- * no pending interrupts.
- */
-asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
-{
-	int i, handled;
-
-	do {
-		for (i = 0, handled = 0; i < fpga_irq_id; ++i)
-			handled |= handle_one_fpga(&fpga_irq_devices[i], regs);
-	} while (handled);
-}
-
-static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
-		irq_hw_number_t hwirq)
-{
-	struct fpga_irq_data *f = d->host_data;
-
-	/* Skip invalid IRQs, only register handlers for the real ones */
-	if (!(f->valid & BIT(hwirq)))
-		return -ENOTSUPP;
-	irq_set_chip_data(irq, f);
-	irq_set_chip_and_handler(irq, &f->chip,
-				handle_level_irq);
-	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-	return 0;
-}
-
-static struct irq_domain_ops fpga_irqdomain_ops = {
-	.map = fpga_irqdomain_map,
-	.xlate = irq_domain_xlate_onetwocell,
-};
-
-void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
-			  int parent_irq, u32 valid, struct device_node *node)
-{
-	struct fpga_irq_data *f;
-	int i;
-
-	if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) {
-		pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__);
-		return;
-	}
-	f = &fpga_irq_devices[fpga_irq_id];
-	f->base = base;
-	f->chip.name = name;
-	f->chip.irq_ack = fpga_irq_mask;
-	f->chip.irq_mask = fpga_irq_mask;
-	f->chip.irq_unmask = fpga_irq_unmask;
-	f->valid = valid;
-
-	if (parent_irq != -1) {
-		irq_set_handler_data(parent_irq, f);
-		irq_set_chained_handler(parent_irq, fpga_irq_handle);
-	}
-
-	/* This will also allocate irq descriptors */
-	f->domain = irq_domain_add_simple(node, fls(valid), irq_start,
-					  &fpga_irqdomain_ops, f);
-
-	/* This will allocate all valid descriptors in the linear case */
-	for (i = 0; i < fls(valid); i++)
-		if (valid & BIT(i)) {
-			if (!irq_start)
-				irq_create_mapping(f->domain, i);
-			f->used_irqs++;
-		}
-
-	pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n",
-		fpga_irq_id, name, base, f->used_irqs);
-
-	fpga_irq_id++;
-}
-
-#ifdef CONFIG_OF
-int __init fpga_irq_of_init(struct device_node *node,
-			    struct device_node *parent)
-{
-	struct fpga_irq_data *f;
-	void __iomem *base;
-	u32 clear_mask;
-	u32 valid_mask;
-
-	if (WARN_ON(!node))
-		return -ENODEV;
-
-	base = of_iomap(node, 0);
-	WARN(!base, "unable to map fpga irq registers\n");
-
-	if (of_property_read_u32(node, "clear-mask", &clear_mask))
-		clear_mask = 0;
-
-	if (of_property_read_u32(node, "valid-mask", &valid_mask))
-		valid_mask = 0;
-
-	fpga_irq_init(base, node->name, 0, -1, valid_mask, node);
-
-	writel(clear_mask, base + IRQ_ENABLE_CLEAR);
-	writel(clear_mask, base + FIQ_ENABLE_CLEAR);
-
-	return 0;
-}
-#endif
diff --git a/arch/arm/plat-versatile/include/plat/fpga-irq.h b/arch/arm/plat-versatile/include/plat/fpga-irq.h
deleted file mode 100644
index 1fac9651d3ca..000000000000
--- a/arch/arm/plat-versatile/include/plat/fpga-irq.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef PLAT_FPGA_IRQ_H
-#define PLAT_FPGA_IRQ_H
-
-struct device_node;
-struct pt_regs;
-
-void fpga_handle_irq(struct pt_regs *regs);
-void fpga_irq_init(void __iomem *, const char *, int, int, u32,
-		struct device_node *node);
-int fpga_irq_of_init(struct device_node *node,
-		     struct device_node *parent);
-
-#endif